Switching power supply secondary side voltage sampling circuit and switching power supply

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By introducing a feedback circuit into the switching power supply for temperature compensation regulation, and using a circuit composed of a thermistor and a reference voltage regulator, the problems of low output voltage accuracy and circuit complexity are solved, achieving precise control and simplified debugging at different temperatures.

CN117277746BActive Publication Date: 2026-07-24SHENZHEN ZHENHUA MICROELECTRONICS

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Patent Information

Application Number: CN202311260985.7
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2023-09-27
Publication Date: 2026-07-24
Estimated Expiration: 2043-09-27

Application Information

Patent Timeline

27 Sep 2023

Application

CN202311260985.7

24 Jul 2026

Publication

CN117277746B

IPC: H02M1/00; H02M1/092; H02M3/335

CPC: H02M1/0025; H02M1/092; H02M3/335; Y02B70/10

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Application Domain

Efficient power electronics conversion Dc-dc conversion

Technology Topics

Hemt circuits Feedback circuits

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AI Technical Summary

Technical Problem

In existing technologies, the output voltage accuracy is not high under three temperature conditions, and the circuit design is complex and inconvenient to debug.

Method used

Temperature compensation regulation is achieved using a feedback circuit, and precise control of the output voltage is realized by using a circuit composed of first and second thermistors and a reference voltage regulator.

Benefits of technology

It achieves precise control of output voltage at different temperatures, and the circuit structure is simple and easy to debug.

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Abstract

The application relates to the technical field of semiconductors, in particular to a switching power supply secondary side voltage sampling circuit and a switching power supply. The switching power supply secondary side voltage sampling circuit comprises a feedback circuit; the feedback circuit is used for receiving and temperature-compensating and adjusting a secondary side output voltage of the switching power supply under a current temperature, obtaining an adjusted secondary side output voltage and outputting the same. The application can realize accurate control of the output voltage under different temperatures, and the circuit structure is simple and convenient to debug.

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