A power module feedback control circuit with dual functions of constant current and constant voltage

A technology of power supply module and feedback control, which is applied in the direction of control/regulation system, regulation of electrical variables, instruments, etc., and can solve problems such as low circuit efficiency
CN110231846BActive Publication Date: 2021-02-09XIAN MICROELECTRONICS TECH INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAN MICROELECTRONICS TECH INST
Publication Date
2021-02-09

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Abstract

The invention discloses a power supply module feedback control circuit with double functions of constant current and constant voltage, and belongs to a semiconductor integrated circuit. The power supply module feedback control circuit with double functions of constant current and constant voltage comprises a voltage stabilizer TL431, a first operational amplifier U1, a second operational amplifierU2, a third operational amplifier U3, a fourth operational amplifier U4, a sampling resistor R and a diode D1; a power supply module can work in a constant voltage mode or a constant current mode bysetting a control end; when the power supply module works in the constant current mode, the control circuit is used for controlling current output by the power supply module, the output current is guaranteed to be constant, and the value of the output current is given by an external control signal; and when the power supply module works in the constant voltage mode, the control circuit is used forcontrolling output voltage of the power supply module, the output voltage is guaranteed to be constant, and the power supply module can serve as a DC / DC converter for direct current voltage conversion.
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Description

technical field

[0001] The invention belongs to semiconductor integrated circuits, in particular to a power supply module feedback control circuit with dual functions of constant current and constant voltage. Background technique

[0002] The existing power supply is mainly a constant voltage source. The traditional constant voltage source usually only has the function of voltage stabilization and is widely used in various electronic circuits, but it does not have the function of a constant current source. Most of the existing constant current sources are based on the power supply of the constant voltage source and add an additional current control function, so that the circuit can output a constant current. However, there are problems that the circuit efficiency is low, and a high-power constant-voltage power supply Vcc is required to supply power to a constant-current load. Contents of the invention

[0003] The object of the present invention is to overcome the above-m...

Claims

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