US 10,381,913 B2 · Power supply control device and control characteristic correction data generation method for power supply control device

Abstract

Correction coefficients corresponding to parameters by which characteristic variation is caused are stored in a data memory of a second integrated circuit element in which driving open/close elements respectively connected in series to a plurality of inductive loads are integrated, and a first integrated circuit element that cooperates with the second integrated circuit element suppresses a current control error accompanying individual variation among circuit components and environmental temperature variation by reading present values of the parameters and combining the present values with the correction coefficients. The correction coefficients are calculated by an adjustment tool in a state where the second integrated circuit element is provided singly, and therefore correction data can be generated in relation to a plurality of temperature environments easily.

A power supply control device that receives power from a DC power supply and supplies a plurality of inductive loads with individually variable load currents Ifi (i=1, 2, . . . , m;

likewise hereafter),
wherein the power supply control device is configured such that a first integrated circuit element having a microprocessor that cooperates with a program memory as a main body and a second integrated circuit element including a plurality of driving open/close elements that are connected to each other in series via a pair of serial-to-parallel converters in order to supply power to the plurality of inductive loads are housed in an identical housing, and heat generated by the plurality of driving open/close elements is transferred to the housing and thereby dissipated,
in accordance with target currents Iti determined by target current setting means in order to obtain the load currents Ifi, the first integrated circuit element either generates open/close command signals DRVi, which are pulse width modulation signals for applying energization duties γi, βi directly to the plurality of driving open/close elements, or causes the second integrated circuit element to generate the open/close command signals DRVi having the energization duties γi by generating drive command signals CNTi, which are first stage pulse width modulation signals having command duties αi that correspond to ratios Iti/Imax of the respective target currents Iti to a maximum target current Imax,
the second integrated circuit element comprises:
a constant voltage power supply that generates a stabilized control voltage Vcc by stepping down a power supply voltage Vb of the DC power supply, and supplies the control voltage Vcc to the first integrated circuit element;
current detection resistors respectively connected in series to the inductive loads;
a plurality of current detection circuits that generate current detection voltages Vfi that are respectively proportionate to the load currents Ifi by amplifying respective end-to-end voltages of the current detection resistors;
a plurality of drive gate circuits that drive the plurality of driving open/close elements respectively ON and OFF in accordance with the pulse width modulation signals so as to variably control the energization duties γi, which are ratios of respective closed periods of the plurality of driving open/close elements to an ON-OFF period;
a plurality of temperature sensors including one or a plurality of resistor temperature detection elements for detecting present temperatures of the plurality of current detection resistors either individually or representatively, and a power supply temperature detection element for detecting a present temperature of the constant voltage power supply;
and
a non-volatile data memory,
control characteristic correction data for calculating present resistances Rti of converted equivalent resistances that are obtained by dividing respective values of the current detection voltages Vfi, which vary in response to variation in environmental conditions specified by correction parameters and individual variation among circuit components including the current detection resistors and the current detection circuits, by the load currents Ifi are stored in the data memory, and these correction data are transmitted in series to a buffer memory provided in the first integrated circuit element at the start of an operation,
the microprocessor comprises present resistance calculating means for obtaining present values of the correction parameters, which include detected temperatures obtained by the plurality of temperature sensors or a power supply detection voltage Vba that is proportionate to the detected temperatures and the power supply voltage Vb, during the operation either by receiving a plurality of analog signal voltages serving as the correction parameters via a multiplexer and then digitally converting the analog signal voltages using a master side AD converter, or by using uplink monitoring data received via the pair of serial-to-parallel converters after the analog signal voltages are digitally converted on a transmission side by a slave side AD converter, and corrects ON-OFF duties of the pulse width modulation signals by combining the present values with the correction data, and
the correction data, which are calculated by an adjustment tool, are stored in the data memory via a slave station side serial-to-parallel converter, among the pair of serial-to-parallel converters.

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Power supply control device and control characteristic correction data generation method for power supply control device

Life of this patent

Power supply control device and control characteristic correction data generation method for power supply control device

Life of this patent

Abstract

Claims10