POWER SUPPLY CONTROL CIRCUIT AND POWER SUPPLY DEVICE

摘要

A power supply control circuit, which is connected to a stabilized direct current power supply having a pair of first and second output terminals and a pair of first and second remote sensing terminals, includes: a current detector configured to detect an output current that is supplied to a load from the stabilized direct current power supply, and to output a current detection voltage; a current difference output unit configured to output a current difference voltage corresponding to a voltage difference between the current detection voltage and a current setting voltage; and a control voltage generator configured to generate a control voltage and output the control voltage to the first remote sensing terminal so as to perform a constant current control operation. The current detector, the current difference output unit and the control voltage generator are operated by only the direct current voltage supplied by the auxiliary power supply.

主权项

1. A power supply control circuit, comprising:
the power supply control circuit being connected to a stabilized direct current power supply, the stabilized direct current power supply having:
a pair of first and second output terminals and a pair of first and second remote sensing terminals,the first output terminal having a positive potential relative to the second output terminal,the first remote sensing terminal having a positive potential relative to the second remote sensing terminal,the second output terminal being connected to the second remote sensing terminal, anda voltage of the second remote sensing terminal being a reference potential; a current detector configured to detect an output current that is output from the stabilized direct current power supply, the output current being supplied toward a load that is connected to the pair of the first and second output terminals, the current detector being configured to output a current detection voltage relative to the reference potential, the current detection voltage corresponding to the output current; a current difference output unit configured to output a current difference voltage, the current difference voltage corresponding to a voltage difference between the current detection voltage and a current setting voltage relative to the reference potential; a control voltage generator configured to generate a control voltage and output the control voltage to the first remote sensing terminal so as to perform a constant current control operation; and an auxiliary power supply configured to supply a direct current voltage to the current detector, the current difference output unit and the control voltage generator, wherein the constant current control operation is configured to operate the stabilized direct current power supply in a constant current state by controlling a voltage value of the control voltage so as to make the current difference voltage approximately zero, and the current detector, the current difference output unit and the control voltage generator are operated by only the direct current voltage supplied by the auxiliary power supply.