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Over-temperature and overvoltage protection circuit

An overvoltage protection circuit and overtemperature technology, which is applied in thermometers, electrical devices, and measurement of electrical variables, can solve problems such as excessive input voltage, and achieve the effect of low overall cost and high reliability

Pending Publication Date: 2018-07-20
SHENZHEN 3NOD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that there is no low-cost and high-reliability protection circuit when the input voltage is too high and the internal temperature of the device is too high, the invention provides an over-temperature and over-voltage protection circuit

Method used

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  • Over-temperature and overvoltage protection circuit

Examples

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Embodiment 1

[0028] Such as figure 1 As shown, an over-temperature and over-voltage protection circuit includes a power supply input terminal, a control switch 1, a control switch 2, a voltage detection device, a temperature detection device, and a power supply output terminal;

[0029] The input of the power input terminal is the positive and negative power input of the DC power supply;

[0030] The control switch 1 is turned on or off by judging the level of the input voltage through the voltage detection device;

[0031] The control switch 2 is to control the opening and closing of the negative pole of the power supply;

[0032] The voltage detection device detects whether the input voltage exceeds a maximum threshold;

[0033] The temperature detection device detects whether the temperature of the PCB circuit exceeds the maximum temperature;

[0034] The power output device outputs positive and negative power of DC power.

[0035] Both the maximum temperature and the maximum thresh...

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PUM

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Abstract

An over-temperature and overvoltage protection circuit comprises a power input end, a control switch (1), a control switch (2), a voltage detector, a temperature detector and a power output end. Positive and negative power of a DC power supply is input in the power input end; the control switch (1) is switched ON / OFF according to the magnitude of an input voltage read by the voltage detector; thecontrol switch (1) controls ON / OFF of a power cathode; the voltage detector detects whether the input voltage exceeds a highest threshold; the temperature detector detects whether the temperature of aPCB exceeds a highest temperature; and the power output end outputs positive and negative power of the DC power supply.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an over-temperature and over-voltage protection circuit. Background technique [0002] At present, most of the mobile power supplies used in the market are charged with 5V. However, with the popularization of fast charging technology, many users will charge the fast charging charger to a 5V power supply, and the fast charging charger is generally 9V / 12V / 20V and other different voltages. Fast charging is to detect the voltage combination on D+ and D-, and output different voltages. When using these unqualified fast charging chargers, or using a 9V voltage charger to charge a 5V power supply, the mobile power supply PCBA will be burned out. Due to the different failure symptoms of the burnout, it may not be possible to continue charging or continue charging. However, there is a certain current, which will cause the temperature to rise, burn the shell, and some devices will catc...

Claims

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Application Information

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IPC IPC(8): G01R19/165G01K7/22
CPCG01K7/22G01R19/165
Inventor 曹木群
Owner SHENZHEN 3NOD ELECTRONICS