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Input overvoltage protection circuit and overvoltage protection method for LLC power supply

A power input and protection circuit technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of inability to protect and increase circuit costs, and achieve the effects of saving space, reducing the use of components, and reducing product costs

Pending Publication Date: 2019-09-24
上海希形科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It can be seen that there are two problems in the existing overvoltage protection of switching voltage input power supply: one is that it cannot play an effective protective role when the input voltage exceeds the breakdown voltage of the switching tube; the other is that additional power switching elements are required, and the circuit cost

Method used

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  • Input overvoltage protection circuit and overvoltage protection method for LLC power supply
  • Input overvoltage protection circuit and overvoltage protection method for LLC power supply
  • Input overvoltage protection circuit and overvoltage protection method for LLC power supply

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0051] An LLC power supply input overvoltage protection circuit provided according to the present invention includes a half bridge, a filter capacitor, an overvoltage detection circuit, a switching tube off-state voltage equalizing circuit, and a control circuit;

[0052] The half-bridge includes two field effect transistors, and these two field effect transistors are respectively recorded as a first field effect transistor and a second field effect transistor; the source of the first field effect transi...

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Abstract

The invention provides an input overvoltage protection circuit and an overvoltage protection method for an LLC power supply. The circuit comprises an overvoltage detection circuit, a switch tube off-state voltage sharing circuit and a control circuit. The circuit is protected accurately and reliably according to the preset threshold value by utilizing the simple element composition, and the switch tube can be prevented from being exploded due to overvoltage within the limit voltage range that the input power supply voltage is twice that the switch tube can bear, so that the circuit can be used in the ultrahigh voltage application occasion. The most basic circuit principle is adopted, and through ingenious and reasonable design and repeated experimental verification, the reliability is extremely high, and the circuit is one of the simplest circuit schemes at present and the lowest cost.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an LLC power supply input overvoltage protection circuit and an overvoltage protection method. Background technique [0002] As a kind of soft switching, the resonant switching converter has the advantages of high operating frequency, low loss, high efficiency and small size. The LLC resonant switching converter has the advantages of being able to realize the ZVS turn-on of the primary switching tube in the full load range, the ZCS turn-off of the rectifier diode, and the advantages of easy magnetic integration and wide input voltage range. The field has received extensive attention and applications. [0003] The L6599 chip of STMicroelectronics has the advantages of high adjustment efficiency, heat sink saving, space saving, good output intermodulation, low output rectifier withstand voltage, and small EMI caused by primary side soft switching. It is used in the con...

Claims

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Application Information

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IPC IPC(8): H02H7/125
CPCH02H7/1252
Inventor 刘金虹王妍
Owner 上海希形科技有限公司
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