Synchronous rectification chip temperature detection control device and method

Abstract

The invention discloses a synchronous rectification chip temperature detection control device and method. The device comprises a temperature detection module and an integrated control module. The temperature detection module is used for sampling the temperature of the synchronous rectification chip and converting the temperature into an electric signal; the integrated control module is used for controlling a time sequence detection module to stop time sequence detection when the temperature of the synchronous rectification chip is abnormal, controlling a power tube driving module to stop powerdriving, and outputting a signal to a complete machine peripheral feedback unit through the output voltage port CON to reduce output voltage. The complete machine load power under the condition thatthe temperature of the synchronous rectification chip is abnormal can be effectively reduced, and the reliability and safety of a power supply system are ensured.

Description

technical field [0001] The invention relates to the technical field of microelectronic detection, in particular to a synchronous rectification chip temperature detection and control device and method. Background technique [0002] Synchronous rectification technology is a new technology that uses special power MOSFET with extremely low on-state resistance to replace Schottky diode to reduce rectification loss. At present, mainstream chips on the market generally have an internal over-temperature protection function. When the temperature is too high, the drive of the synchronous rectification chip will be stopped. When the abnormality is resolved, the synchronous timing detection function will be turned on normally. In fact, when the temperature is detected to be too high, it just turns off timing detection and driving. However, the primary main control chip does not know that the temperature of the chip on the secondary side is high, the output voltage still exists, and the ...

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Problems solved by technology

In fact, when the temperature is detected to be too high, it just turns off timing detection and driving. However, the primary main control chip does not know that the temperature of the chip on the secondary side is high, the output voltage still exists, and the load is still working. At this time, the synchronization The body diode of the power tube inside the rectifier chip will continue to work instead of the power MOSFET, and the current capacity of the body diode is limited and will not be disconnected. As the temperature rises, it will eventually cause burnout, and may even cause Fire, a serious safety hazard

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