Back to results
US 3,942,110 AGranted
Analog to pulse rate converter
AssigneeGeneral Electric Company
InventorMiran Milkovic
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeGeneral Electric Company
InventorMiran Milkovic
Estimating the term…
A bipolar C-MOS analog to pulse rate converter is disclosed which provides a pulse train at its output having a frequency which is proportional to the magnitude of an analog input signal over a wide dynamic range. An analog input signal is integrated until the output of the integrator reaches a threshold level. A threshold detector generates a signal when the threshold level is reached which signal is coupled to a JK flip-flop. The JK flip-flop changes its state to thereby provide an output pulse and at the same time provide a switching pulse for coupling a DC reference source to the input of the integrator for resetting the integrator to a reference level. The flip-flop is then reset and the integrator again integrates the analog input signal to initiate a second cycle. Since the output frequency of the converter is dependent upon the time required for the output of the integrator to reach the threshold level, the output frequency is directly proportional to the magnitude of the input signal to the converter.
In an apparatus for metering active electrical energy in a polyphase system including means for generating an analog voltage having a magnitude which is proportional to the average power of said system, the improvement comprising:
An apparatus for metering active electrical energy in a polyphase N line system comprising means for measuring current in at least (n-1) of said lines, means for measuring at least (n-1) different line voltages, means coupled with said current measuring means for producing a first plurality of at least (n-1) analog signals representing currents measured in the (n-1) lines, means coupled with the voltage measuring means for producing a second plurality of at least (n-1) analog signals representing the different (n-1) line voltages, means for pairing different ones of the current analog signals of the first plurality with different ones of the voltage analog signals of the second plurality such that the different (n-1) pairs are representative of the instantaneous power in different parts of said polyphase system, means coupled with said pairing means for converting each of the (n-1) pairs of analog signals to a different one of an (n-1) series of consecutive signals, each signal in each of the (n-1) series representing instantaneous power in a different part of said system, means coupled with said last-mentioned conversion means for converting said signals in said series of consecutive signals to a signal representing average power in the whole system, and an analog to pulse rate converter for converting said average power signal to an output pulse train having a frequency which is proportional to the magnitude of said average power signal, said converter including means for integrating said average power signal, means for detecting when the magnitude of said integrated signal reaches a predetermined threshold level, the integrating interval until said threshold level is reached being directly proportional to the magnitude of said average power signal, pulse generating means responsive to said detecting means for generating a pulse when said integrated signal reaches said threshold level, and means response to said pulse generating means for resetting said integrator to a reference level, said integrator being reset within a predetermined time interval wherein the frequency of the pulses generated by said pulse generating means is proportional to the magnitude of said average power signal.
In an apparatus for metering active electrical energy in a polyphase system including means for generating an analog voltage having a magnitude which is proportional to the average power of said system, the improvement comprising an analog to pulse rate converter for converting a bipolar analog input signal to an output pulse train having a frequency which is proportional to the magnitude of the input signal, said converter including means for integrating said analog input signal, means for detecting when said integrated signal reaches a first amplitude in response to a positive input signal, means for detecting when said integrated signal reaches a second amplitude in response to a negative input signal, said first and second amplitudes being of the same magnitude but of opposite polarity, pulse generating means responsive to said detecting means for generating a pulse when said integrated signal reaches either of said first and second amplitudes, and means responsive to said pulse generating means for resetting said integrator to a reference level, said integrator being reset within a predetermined time interval wherein the frequency of the pulses generated by said pulse generating means is proportional to the magnitude of said analog input signal.
The apparatus of claim 22 wherein said pulse generator means includes clock means for defining the pulse width of said generated pulses, said pulses having a pulse width equal to said predetermined integrator reset interval.
Dependencies are inferred from the claim text.