Self-powered Internet of Things chip overvoltage protection circuit

Abstract

The invention discloses a self-powered Internet of Things chip overvoltage protection circuit which comprises a switching circuit bias voltage generation circuit which is connected with an energy acquisition circuit and a switching circuit and used for generating bias control voltage required for switching on the switching circuit; the switching circuit which is connected with the energy acquisition circuit and an Internet of Things chip system, and is used for forming a conduction path with variable equivalent resistance between the output of the energy acquisition circuit and the Internet ofThings chip system under the control of the bias control voltage generated by the bias voltage generation circuit of the switching circuit so as to form a variable voltage drop; and a bleeder circuitwhich is connected with the output end of the switching circuit and the switching circuit bias voltage generation circuit so as to form a bleeder branch when the output voltage is relatively high andinfluence the bias control voltage output by the switching circuit bias voltage generation circuit in proportion.

Description

technical field [0001] The invention relates to an overvoltage protection circuit, in particular to an overvoltage protection circuit for a self-powered Internet of Things chip. Background technique [0002] Any electronic device has a maximum rated operating voltage that it can withstand. Once the maximum withstand voltage range is exceeded, the life of the device will be greatly affected, or even the device will be directly damaged. The overvoltage protection circuit can be used to prevent damage to devices in the circuit system caused by excessive input voltage. Once the input voltage is higher than the set voltage, the overvoltage protection voltage will immediately start to shut down or reduce the input to the set value. [0003] In the existing self-powered IoT chip system, the input power of the chip is usually provided by its own energy harvesting circuit. When the energy collected by the system is greater than the energy required by the system, there is a danger of ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide an overvoltage protection circuit for a self-powered IoT chip to solve the problem that the self-powered IoT chip may cause the input voltage of the self-powered IoT chip to The problem that the device is destroyed due to excessive voltage

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