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Switch power supply feedback circuit based on digital optocoupler

A technology of feedback circuit and switching power supply, which is applied in the direction of conversion equipment without intermediate conversion to AC, which can solve the problem of insufficient output voltage stability of the winding feedback circuit, and achieve low power consumption, high stability output, and high conversion efficiency. Effect

Active Publication Date: 2014-10-08
BEIJING INST OF CONTROL ENG
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  • Abstract
  • Description
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a switching power supply feedback circuit based on a digital optocoupler for the problem of insufficient output voltage stability of the winding feedback circuit in the prior art

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  • Switch power supply feedback circuit based on digital optocoupler
  • Switch power supply feedback circuit based on digital optocoupler

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Embodiment Construction

[0013] The digital optocoupler-based switching power supply feedback circuit according to the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like figure 1 As shown, the switching power supply feedback circuit based on a digital optocoupler according to the present invention includes a digital optocoupler V1, a first resistor R1, a second resistor R2, an inductor L1, a capacitor C1, a diode D1, and a third resistor R3, wherein the digital The optocoupler V1 includes a light emitting diode Z1, a light detecting diode Z2, a first triode Q1, and a second triode Q2. Moreover, the digital optocoupler V1, the inductor L1, the capacitor C1, the diode D1, and the third resistor R3 constitute a step-down converter (BUCK) circuit.

[0015] The anode of the light-emitting diode Z1 in the digital optocoupler V1 is connected to the anode of the external pulse signal (Pulse), and the cathode of the l...

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Abstract

The invention discloses a switch power supply feedback circuit based on a digital optocoupler. The switch power supply feedback circuit based on the digital optocoupler comprises an inductor, a capacitor, a diode, a first resistor, a second resistor, a third resistor and the digital optocoupler. The optocoupler, the inductor, the capacitor, the diode and the third resistor constitute a buck converter circuit. The switch power supply feedback circuit based on the digital optocoupler achieves optical isolation of output feedback of a switch power supply, and meanwhile high-stability output of the switch power supply is guaranteed.

Description

technical field [0001] The invention belongs to the field of circuit design, and relates to a switching power supply feedback circuit based on a digital optocoupler, which is suitable for satellites and other switching power supply circuits that need to realize high-stability output functions. Background technique [0002] At present, the feedback technology of spacecraft switching power supply mostly adopts the winding feedback method. Although this method is simple, its accuracy is low, resulting in poor output voltage stability of the switching power supply; civilian switching power supply mostly adopts the feedback method of analog optocoupler. This feedback method is simple and flexible, and can ensure high stability of the output voltage of the switching power supply; however, after the analog optocoupler is irradiated in the space environment, its accuracy will drop sharply, which will cause the output of the switching power supply to be unstable. [0003] Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
Inventor 叶东东郑炜苏少侃王立伟陈明阳李荷丹刘鑫虎尹桂娟张扬彭政李山孙晓枫刘娇蒋岩
Owner BEIJING INST OF CONTROL ENG
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