Constant-voltage and constant-current control circuit applied to power supply technology

Abstract

The invention relates to a constant-voltage and constant-current control circuit applied to the power supply technology. The constant-voltage and constant-current control circuit comprises a voltage control loop applied to the power supply technology, a current control loop applied to the power supply technology and an optical coupler. The voltage control loop and the current control loop are serially connected, an input end of the optical coupler is connected with a voltage output end of the voltage control loop, and the other input end of the optical coupler is connected with a voltage output end of the current control loop; an input end of the voltage control loop serves as a voltage feedback sampling input end in the power supply technology, and the other input end of the voltage control loop serves as a reference voltage input end; and an input end of the current control loop serves as a current feedback sampling input end in the power supply technology, and the other input end of the current control loop serves as a reference voltage input end. By means of the technical scheme, a switch power source and a charging device can provide constant-voltage and constant-current power source, remote control and energy conservation can be achieved, and the constant-voltage and constant-current control circuit improves power utilization safety and is very practical.

Description

technical field [0001] The present invention relates to a power supply technology, in particular to a power supply technology that can realize external control (such as remote control) The constant voltage constant current control circuit. Background technique [0002] At present, the control of switching power supply mostly adopts negative feedback control technology, that is, the control of switching power supply is realized on the basis of feedback network. [0003] In the process of realizing the present invention, the inventor found that: when the feedback network of the negative feedback control technology is disconnected, the output voltage or output current of the switching power supply is out of control, which may affect the switching power supply and the subsequent electrical equipment of the switching power supply. cause damage. [0004] In view of the defects in the above-mentioned existing feedback control technology, the inventor, based on years of rich pract...

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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that: when the feedback network of the negative feedback control technology is disconnected, the output voltage or output current of the switching power supply is out of control, which may affect the switching power supply and the subsequent electrical equipment of the switching power supply. cause damage

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