Overcurrent and overtemperature protection circuit and MPPT chip

Abstract

The invention provides an overcurrent and overtemperature protection circuit and an MPPT chip. The overcurrent and overtemperature protection circuit comprises a sampling current source, a multistagecurrent comparison circuit, a temperature and current source, a multistage temperature comparison circuit and a control circuit, wherein an output end of the sampling current source is connected withan input end of the multistage current comparison circuit; the output end of the temperature and current source is connected with the input end of the multistage temperature comparison circuit; the output end of the multistage current comparison circuit is connected with a first input end of the control circuit; and the output end of the multistage temperature comparison circuit is connected witha second input end of the control circuit. According to the overcurrent and overtemperature protection circuit, control on the working state of the MPPT chip through temperature and breakover currentin common is achieved, that is to say, the MPPT chip can be controlled to stop working when the temperature and the breakover circuit are relatively high, and the phenomenon of serious heating of theMPPT chip is avoided, thereby improving the security and the reliability of the MPPT chip.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to an overcurrent and overtemperature protection circuit and an MPPT chip. Background technique [0002] With the development of solar technology, the application of solar cells is becoming more and more extensive. Solar cells convert light energy into electrical energy through photovoltaic panels. In order to improve conversion efficiency, a chip-level MPPT (Maximum Power Point Tracking) system is usually connected to the output of photovoltaic panels to achieve maximum power. Tracking and Conversion. In the existing technology, considering that the MPPT chip will be affected by the external temperature, the output current of the photovoltaic panel and the hot spot effect, etc., resulting in different degrees of heat generation, or even being burned, the MPPT chip is usually added with an over-temperature protection circuit and an over-temperature protection circuit. O...

AI Technical Summary

Problems solved by technology

However, the over-temperature protection circuit and over-current protection circuit can only achieve their own single-value control. If the temperature is high and the conduction current is high and it is not enough to control the chip to stop working, the heating phenomenon of the MPPT chip is also relatively serious. Thereby reducing the security and reliability of the MPPT chip

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