Protection circuit, control circuit, power conversion circuit and protection method

A protection circuit and power conversion technology, applied in the electronic field, can solve problems such as power supply or load damage, pin virtual soldering, system failure, etc., and achieve the effect of improving reliability

Pending Publication Date: 2022-06-28
杭州必易微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use environment of the power conversion circuit is complex, and there will inevitably be problems with the various pins of the chip, transformers, diodes, etc.
The occurrence of any problem will ca

Method used

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  • Protection circuit, control circuit, power conversion circuit and protection method
  • Protection circuit, control circuit, power conversion circuit and protection method
  • Protection circuit, control circuit, power conversion circuit and protection method

Examples

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Embodiment Construction

[0024] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with the examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0025] The description in this section is only for a few typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. Combinations of different embodiments, replacement of some technical features in different embodiments, and replacement of same or similar prior art means with some technical features in the embodiments are also within the scope of description and protection of the present invention.

[0026] "Coupling" or "connection" in the specification includes both direct connection and indirect connection. Indirect connection is a connection through an intermed...

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Abstract

The invention provides a protection circuit, a control circuit, a power conversion circuit and a protection method. The protection circuit comprises a fault detection circuit used for receiving a detection signal and providing a fault generation signal; the first timing circuit is used for controlling a power switch tube of the power supply conversion circuit to be switched off through a control loop when the fault occurs for a first time, and allowing the power switch tube to be switched on in the next working period; and a second timing circuit that triggers fault protection when the fault occurs for a second time. According to the protection circuit, the control circuit, the power conversion circuit and the protection method provided by the invention, the sensitivity and anti-interference performance of fault protection can be considered, and the reliability of fault protection is improved.

Description

technical field [0001] The invention relates to the field of electronics, in particular but not limited to a protection circuit, a control circuit, a power conversion circuit and a protection method. Background technique [0002] The power conversion circuit is used to convert an input power into an output power suitable for driving the load, and is an indispensable part of electronic products. Among them, reliability is an important factor to consider in the power conversion circuit, which requires that the power conversion circuit can check and respond to various faults that may occur in time to avoid damage to the load or affect its normal operation. [0003] figure 1 A flyback isolated power conversion circuit is shown, including a rectifier circuit, a transformer, a control circuit chip 10, a power switch Q1, a resistor, a capacitor, a diode and other components, wherein the control circuit chip 10 located on the primary side controls the power conversion circuit. The...

Claims

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Application Information

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IPC IPC(8): H02H3/06H02H3/027H02H7/125H02H7/12
CPCH02H3/06H02H3/027H02H7/1255H02H7/1216
Inventor 文鹏许超群
Owner 杭州必易微电子有限公司
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