Overvoltage and undervoltage protection circuit

Abstract

The invention discloses an overvoltage and undervoltage protection circuit which is used for connection between a voltage source and a load and comprises a detecting module and a switch module. The input end of the detecting module is connected with the voltage source, and the output end is connected with the control end of the switch module for determining whether the voltage of the voltage source is higher than a high-voltage threshold or lower than a low-voltage threshold and transmitting determination result information to the control end of the switching module. The input end of the switch module is connected with the voltage source, and the output end is connected with the load for controlling on or off between the input end and the output end according to the determination result information which is received by the control end. If the voltage of the voltage source is higher than the high-voltage threshold or is lower than the low-voltage threshold, the circuit between the input end and the output end is switched off; and otherwise, the circuit between the input end and the output end is switched on. When the voltage of the voltage source is higher than the high-voltage threshold or lower than the low-voltage threshold, the circuit between the voltage source and the load is switched off, thereby preventing product damage caused by overhigh input voltage and protecting the input voltage from excessive voltage drop. The overvoltage and undervoltage protection circuit has advantages of low cost and easy realization.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to an overvoltage and undervoltage protection circuit. Background technique [0002] Currently, many electronic products are designed to be powered by adapters or batteries, such as mobile phones and laptops. When the adapter is used to power the product, if the adapter is abnormal or the adapter is taken by mistake, it is very likely that the input voltage to the electronic product is greater than the maximum voltage that the device can withstand, resulting in damage to the electronic product. When the battery is used for power supply, if the battery voltage drops to a certain value and continues to discharge, it is likely to reduce the life of the battery, and even cause irreversible damage to the battery. Contents of the invention [0003] In order to solve the above problems, the present invention provides an overvoltage and undervoltage protection circuit for connecting between...

AI Technical Summary

Problems solved by technology

When using an adapter to power the product, if the adapter is abnormal, or if you take the wrong adapter, it is likely to cause the input voltage to the electronic product to be greater than the maximum voltage that the device can withstand, resulting in damage to the electronic product

When using battery power supply, if the battery voltage drops to a certain value and continues to discharge, it is likely to reduce the life of the battery, and even cause irreversible damage to the battery

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