US 5,177,695 A · Device and method for adaptive digital power control

Abstract

An adaptive power control device and method are disclosed in which characteristics of a transfer function of a power control system are dynamically manipulated upon selective variation of a sampling rate of power control output values. Systematic monitoring of critical sampling rates allows for alternate assignment of part of a power control system workload during slower sampling frequencies. Upon determination of an operably insignificant variation of a power control system output value from a previous power control system output value, the sampling rate is decreased, enabling reallocation of a portion of the workkload of the digital power control device.

Claims44

Dependent claims

A control device for controlling a controlled device having a transfer function, wherein the control device controls the controlled device by sampling an output parameter of the controlled device at a sample rate to obtain at least three samples:

a selected sample, a sample previous thereto, and a further selected sample:
the control device comprising:
A) sample rate control means, responsive to a sampled output parameter, for controlling the sample rate as a function thereof;
and
B) transfer function control means, responsive to the sample rate control means, for automatically altering the transfer function as a function of the sample rate,
wherein;
the sample previous thereto is that sample obtained immediately previous thereto and the further selected sample is that sample obtained immediately subsequent thereto,
a desired maximum deviation for a difference between the selected sample and the sample previous thereto is an input to the control device,
the sample previous thereto is that sample obtained immediately previous thereto,
the sample rate control means controls the sample rate as a function of a plurality of samples of sampled output parameter, and
the plurality of samples of sampled output parameter is substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device.

8 more elements

a selected sample, a sample previous thereto, and a further selected sample;
the control device comprising:
A) sample rate control means, responsive to a sampled output parameter, for controlling the sample rate as a function thereof;
and
B) transfer function control means, responsive to the sample rate control means, for automatically altering the transfer function as a function of the sample rate, wherein the sample rate control means controls the sample rate as a function of a plurality of samples of sampled output parameter, wherein the plurality of samples of sampled output parameter is utilized to obtain a first comparison reference value,
wherein the first comparison reference value is an arithmetic mean of the plurality of samples of sampled output parameter, and the sample rate control means sets a minimum desired deviation as substantially a minimum of:
the first comparison reference value and the desired maximum deviation, and
when the sample rate control means has set a minimum desired deviation as substantially a minimum of;
the first comparison reference value and the desired maximum deviation, the sample rate control means further obtains a plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate,
the plurality of samples of sampled output parameter is utilized to determine, substantially, first and second comparison reference values,
the first comparison reference value is an arithmetic mean of the plurality of samples of sampled output parameter,
the second comparison reference value is a standard deviation of the plurality of samples of sampled output parameter, such that;
AA) if the standard deviation of the plurality of samples of sampled output parameter is less than or equal to the minimum desired deviation, then the sample rate control means further causes the control device to disregard sampling a plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate;
BB) if the control device disregards sampling the plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate, then the sample rate control means further recycles iteratively to set a minimum desired deviation as substantially a minimum of;
the first comparison reference value and the desired maximum deviation, the sample rate control means further obtains a plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate;
CC) if the standard deviation of the plurality of samples of sampled output parameter is greater than the minimum desired deviation, then the sample rate control means further causes the control device to activate a function to automatically alter the transfer function as a function of the sample rate;
and
DD) if the standard deviation of the plurality of samples of sampled output parameter is greater than the minimum desired deviation and the sample rate control means has caused the control device to activate a function to automatically alter the transfer function as a function of the sample rate, then the sample rate control means further recycles iteratively to set a minimum desired deviation as substantially a minimum of;
the first comparison reference value and the desired maximum deviation, the sample rate control means further obtains a plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate.

16 more elements

a selected sample, a sample previous thereto, and a further selected sample;
the control device comprising:
A) sample rate control means, responsive to a sampled output parameter, for controlling the sample rate as a function thereof;
and
B) transfer function control means, responsive to the sample rate control means, for automatically altering the transfer function as a function of the sample rate, wherein the sample rate control means further compares a first difference between the selected sample of the output parameter and the sample previous thereto with the second difference between the further selected sample and the selected sample, wherein,
AA) if the first difference between the selected sample of the output parameter and the sample previous thereto is compared with the second difference between the further selected sample and the selected sample, and the second difference between the further selected sample and the selected sample is greater than the first difference between the selected sample of the output parameter and the sample previous thereto, and the first difference between the selected sample of the output parameter and the sample previous thereto is substantially equal to 0,
then the sample rate control means selects a maximum sample rate allocated for control usage by the control device,
BB) if the first difference between the selected sample of the output parameter and the sample previous thereto is compared with the second difference between the further selected sample and the selected sample, and the second difference between the further selected sample and the selected sample is greater than the first difference between the selected sample of the output parameter and the sample previous thereto, and the first difference between the selected sample of the output parameter and the sample previous thereto is not substantially equal to 0,
then the sample rate control means selects a minimum sample rate value from:
a product of the sample rate multiplied by two;
and a maximum sample rate allocated for control usage by the control device;
and
CC) if the first difference between the selected sample of the output parameter and the sample previous thereto is compared with the second difference between the further selected sample and the selected sample, and the second difference between the further selected sample and the selected sample is less than the first difference between the selected sample of the output parameter and the sample previous thereto,
then the sample rate control means selects a maximum sample rate value from;
a quotient of the sample rate divided by two;
and a minimum sample rate allocated for control usage by the control device.

13 more elements

A method for controlling a controlled device having a transfer function, wherein the control device controls the controlled device by sampling an output parameter of the controlled device at a sample rate to obtain at least three samples:

a selected sample, a samples previous thereto, and a further selected sample;
the method comprising the steps of:
A) controlling the sampling rate as a function of the sampled output parameter;
and
B) automatically altering the transfer function as a function of the sampling rate,
wherein the step of controlling the sample rate as a function, at least in part, of the sampled output parameter further includes the steps of:
AA) obtaining at least three samples of the output parameter;
BB) determining at least a first and a second comparison reference value utilizing the sampled output parameter values;
CC) determining, if the second comparison reference value is greater than the first comparison reference value and the first reference value is substantially equal to zero, then the sample rate is a maximum sample rate allocated for control usage by the control device;
DD) determining, if the second comparison reference value is greater than the first comparison reference value and the first comparison reference value is substantially not zero, then the sample rate is substantially a minimum of:
a product of the sample rate multiplied by two and a maximum sample rate allocated for control usage by the control device;
and
EE) determining, if the second comparison reference value is less than the first comparison reference value, then the sample rate is a maximum of:
a quotient of the sample rate divided by two and a minimum sampling rate allocated for control usage by the control device, thus automatically altering a damping coefficient related to the system and providing an output response in accordance with an approximated preselected desired output response.

11 more elements

A control device having a power control system with an input value, for utilizing variation of a sampling rate of an output value of the power control system to adjust a transfer function of the power control system, comprising:

A) a sensor responsive to the sampling rate for storing that sampling rate of the power control system output values;
B) a power control device responsive to the sensor for implementing the sampling rate, and accumulating and storing at least three power control system output values, for utilizing the at least three power control system output values to determine at least two comparison values, being a prior power control system output difference value (that is, a difference between a first two of the three power control system output values) and a latter power control system output difference value (that is, a difference between a last two of the three power control system output values);
and for regulating the sampling rate in conformance with the at least two comparison values,
such that the transfer function of the power control system is automatically adjusted,
wherein one of;
(a) if a latter power control system output difference value is smaller than a prior power control system output difference value, then the regulation means modifies the sample rate to the larger of;
a quotient of the sampling rate divided by 2 or the minimum sampling rate allowed by the power control system,
(b) if a latter power control system output difference value is substantially equal to a prior power control system output value, then the regulation means effectively maintains a same sample rate,
(c) if a latter power control system output difference value is larger than a prior power control system output difference value and the prior power control system output difference value is substantially not equal to zero, then the regulation means effectively sets the sampling rate equal to the larger of:
a product of the sampling rate multiplied by 2 or the maximum sampling rate allowed for power control usage by the power control system, and
(d) if a latter power control system output difference value is larger than a prior power control system output difference value and the prior power control system output difference value is substantially equal to zero, then the regulation means effectively sets a sample rate equal to the maximum sampling rate allowed for power control usage by the power control system,
thus automatically altering a damping coefficient related to the system and providing an output response in accordance with an approximated preselected desired output response.

9 more elements

A method for utilizing selective variation of a sampling rate of output values of a power control system to adjust a transfer function of the power control system, comprising the steps of;

A) selecting a sampling rate of the power control system output values;
B) implementing the sampling rate, and obtaining at least three power control system output values;
C) utilizing the at least three power control system output values to determine at least two comparison values, being a previous power control system output difference value (that is, a difference between a first two of the three power control system output values) and a subsequent power control system output difference value (that is, a difference between a last two of the three power control system output values);
D) regulating the sample rate in conformance with the at least two comparison values;
and
E) regulating the transfer function in conformance with the at least two comparison values relative to the sample rate including at least one of:
(a) if a subsequent power control system output difference value is smaller than a previous power control system output difference value, further including modifying the sampling rate to the larger of:
a quotient of the sampling rate divided by 2 and the minimum sampling rate allowed by the power control system,
(b) if a subsequent power control system output difference value is substantially larger than a previous power control system output difference value, and a previous power control system output difference value is substantially equal to zero, further including modifying the sampling rate to the smaller of;
of a product of the sampling rate multiplied by 2 and the maximum sampling rate allowed by the power control system,
(c) if a subsequent power control system output difference value is substantially larger than a previous power control system output difference value, and a previous power control system output difference value is not substantially equal to zero, further including modifying the sampling rate to the maximum sampling rate allowed by the power control system, and
(d) if the method determines that a latter power control system output difference value is substantially equal to a prior power control system output difference value, further including regulating the sampling rate in conformance with the at least two comparison values by maintaining th sample rate unchanged,
thus automatically altering a damping coefficient related to the system and providing an output response in accordance with an approximated preselected desired output response.

10 more elements

Dependencies are inferred from the claim text.

Abstract

Claims44

Dependent claims

a selected sample, a sample previous thereto, and a further selected sample:
the control device comprising:
A) sample rate control means, responsive to a sampled output parameter, for controlling the sample rate as a function thereof;
and
B) transfer function control means, responsive to the sample rate control means, for automatically altering the transfer function as a function of the sample rate,
wherein;
the sample previous thereto is that sample obtained immediately previous thereto and the further selected sample is that sample obtained immediately subsequent thereto,
a desired maximum deviation for a difference between the selected sample and the sample previous thereto is an input to the control device,
the sample previous thereto is that sample obtained immediately previous thereto,
the sample rate control means controls the sample rate as a function of a plurality of samples of sampled output parameter, and
the plurality of samples of sampled output parameter is substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device.

8 more elements

a selected sample, a sample previous thereto, and a further selected sample;
the control device comprising:
A) sample rate control means, responsive to a sampled output parameter, for controlling the sample rate as a function thereof;
and
B) transfer function control means, responsive to the sample rate control means, for automatically altering the transfer function as a function of the sample rate, wherein the sample rate control means controls the sample rate as a function of a plurality of samples of sampled output parameter, wherein the plurality of samples of sampled output parameter is utilized to obtain a first comparison reference value,
wherein the first comparison reference value is an arithmetic mean of the plurality of samples of sampled output parameter, and the sample rate control means sets a minimum desired deviation as substantially a minimum of:
the first comparison reference value and the desired maximum deviation, and
when the sample rate control means has set a minimum desired deviation as substantially a minimum of;
the first comparison reference value and the desired maximum deviation, the sample rate control means further obtains a plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate,
the plurality of samples of sampled output parameter is utilized to determine, substantially, first and second comparison reference values,
the first comparison reference value is an arithmetic mean of the plurality of samples of sampled output parameter,
the second comparison reference value is a standard deviation of the plurality of samples of sampled output parameter, such that;
AA) if the standard deviation of the plurality of samples of sampled output parameter is less than or equal to the minimum desired deviation, then the sample rate control means further causes the control device to disregard sampling a plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate;
BB) if the control device disregards sampling the plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate, then the sample rate control means further recycles iteratively to set a minimum desired deviation as substantially a minimum of;
the first comparison reference value and the desired maximum deviation, the sample rate control means further obtains a plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate;
CC) if the standard deviation of the plurality of samples of sampled output parameter is greater than the minimum desired deviation, then the sample rate control means further causes the control device to activate a function to automatically alter the transfer function as a function of the sample rate;
and
DD) if the standard deviation of the plurality of samples of sampled output parameter is greater than the minimum desired deviation and the sample rate control means has caused the control device to activate a function to automatically alter the transfer function as a function of the sample rate, then the sample rate control means further recycles iteratively to set a minimum desired deviation as substantially a minimum of;
the first comparison reference value and the desired maximum deviation, the sample rate control means further obtains a plurality of samples of sampled output parameter, substantially determined by a quotient of a reciprocal of a bandwidth of a controlled system of the controlled device and a minimum conversion time determined by the control device, the plurality of samples of sampled output parameter being obtained by a successive sampling at a selected sample rate.

16 more elements

a selected sample, a sample previous thereto, and a further selected sample;
the control device comprising:
A) sample rate control means, responsive to a sampled output parameter, for controlling the sample rate as a function thereof;
and
B) transfer function control means, responsive to the sample rate control means, for automatically altering the transfer function as a function of the sample rate, wherein the sample rate control means further compares a first difference between the selected sample of the output parameter and the sample previous thereto with the second difference between the further selected sample and the selected sample, wherein,
AA) if the first difference between the selected sample of the output parameter and the sample previous thereto is compared with the second difference between the further selected sample and the selected sample, and the second difference between the further selected sample and the selected sample is greater than the first difference between the selected sample of the output parameter and the sample previous thereto, and the first difference between the selected sample of the output parameter and the sample previous thereto is substantially equal to 0,
then the sample rate control means selects a maximum sample rate allocated for control usage by the control device,
BB) if the first difference between the selected sample of the output parameter and the sample previous thereto is compared with the second difference between the further selected sample and the selected sample, and the second difference between the further selected sample and the selected sample is greater than the first difference between the selected sample of the output parameter and the sample previous thereto, and the first difference between the selected sample of the output parameter and the sample previous thereto is not substantially equal to 0,
then the sample rate control means selects a minimum sample rate value from:
a product of the sample rate multiplied by two;
and a maximum sample rate allocated for control usage by the control device;
and
CC) if the first difference between the selected sample of the output parameter and the sample previous thereto is compared with the second difference between the further selected sample and the selected sample, and the second difference between the further selected sample and the selected sample is less than the first difference between the selected sample of the output parameter and the sample previous thereto,
then the sample rate control means selects a maximum sample rate value from;
a quotient of the sample rate divided by two;
and a minimum sample rate allocated for control usage by the control device.

13 more elements

a selected sample, a samples previous thereto, and a further selected sample;
the method comprising the steps of:
A) controlling the sampling rate as a function of the sampled output parameter;
and
B) automatically altering the transfer function as a function of the sampling rate,
wherein the step of controlling the sample rate as a function, at least in part, of the sampled output parameter further includes the steps of:
AA) obtaining at least three samples of the output parameter;
BB) determining at least a first and a second comparison reference value utilizing the sampled output parameter values;
CC) determining, if the second comparison reference value is greater than the first comparison reference value and the first reference value is substantially equal to zero, then the sample rate is a maximum sample rate allocated for control usage by the control device;
DD) determining, if the second comparison reference value is greater than the first comparison reference value and the first comparison reference value is substantially not zero, then the sample rate is substantially a minimum of:
a product of the sample rate multiplied by two and a maximum sample rate allocated for control usage by the control device;
and
EE) determining, if the second comparison reference value is less than the first comparison reference value, then the sample rate is a maximum of:
a quotient of the sample rate divided by two and a minimum sampling rate allocated for control usage by the control device, thus automatically altering a damping coefficient related to the system and providing an output response in accordance with an approximated preselected desired output response.

11 more elements

A) a sensor responsive to the sampling rate for storing that sampling rate of the power control system output values;
B) a power control device responsive to the sensor for implementing the sampling rate, and accumulating and storing at least three power control system output values, for utilizing the at least three power control system output values to determine at least two comparison values, being a prior power control system output difference value (that is, a difference between a first two of the three power control system output values) and a latter power control system output difference value (that is, a difference between a last two of the three power control system output values);
and for regulating the sampling rate in conformance with the at least two comparison values,
such that the transfer function of the power control system is automatically adjusted,
wherein one of;
(a) if a latter power control system output difference value is smaller than a prior power control system output difference value, then the regulation means modifies the sample rate to the larger of;
a quotient of the sampling rate divided by 2 or the minimum sampling rate allowed by the power control system,
(b) if a latter power control system output difference value is substantially equal to a prior power control system output value, then the regulation means effectively maintains a same sample rate,
(c) if a latter power control system output difference value is larger than a prior power control system output difference value and the prior power control system output difference value is substantially not equal to zero, then the regulation means effectively sets the sampling rate equal to the larger of:
a product of the sampling rate multiplied by 2 or the maximum sampling rate allowed for power control usage by the power control system, and
(d) if a latter power control system output difference value is larger than a prior power control system output difference value and the prior power control system output difference value is substantially equal to zero, then the regulation means effectively sets a sample rate equal to the maximum sampling rate allowed for power control usage by the power control system,
thus automatically altering a damping coefficient related to the system and providing an output response in accordance with an approximated preselected desired output response.

9 more elements

A method for utilizing selective variation of a sampling rate of output values of a power control system to adjust a transfer function of the power control system, comprising the steps of;

A) selecting a sampling rate of the power control system output values;
B) implementing the sampling rate, and obtaining at least three power control system output values;
C) utilizing the at least three power control system output values to determine at least two comparison values, being a previous power control system output difference value (that is, a difference between a first two of the three power control system output values) and a subsequent power control system output difference value (that is, a difference between a last two of the three power control system output values);
D) regulating the sample rate in conformance with the at least two comparison values;
and
E) regulating the transfer function in conformance with the at least two comparison values relative to the sample rate including at least one of:
(a) if a subsequent power control system output difference value is smaller than a previous power control system output difference value, further including modifying the sampling rate to the larger of:
a quotient of the sampling rate divided by 2 and the minimum sampling rate allowed by the power control system,
(b) if a subsequent power control system output difference value is substantially larger than a previous power control system output difference value, and a previous power control system output difference value is substantially equal to zero, further including modifying the sampling rate to the smaller of;
of a product of the sampling rate multiplied by 2 and the maximum sampling rate allowed by the power control system,
(c) if a subsequent power control system output difference value is substantially larger than a previous power control system output difference value, and a previous power control system output difference value is not substantially equal to zero, further including modifying the sampling rate to the maximum sampling rate allowed by the power control system, and
(d) if the method determines that a latter power control system output difference value is substantially equal to a prior power control system output difference value, further including regulating the sampling rate in conformance with the at least two comparison values by maintaining th sample rate unchanged,
thus automatically altering a damping coefficient related to the system and providing an output response in accordance with an approximated preselected desired output response.

10 more elements

Dependencies are inferred from the claim text.

Device and method for adaptive digital power control

Life of this patent

Abstract

Claims44

Device and method for adaptive digital power control

Life of this patent

Abstract

Claims44