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Overvoltage protection circuit and electronic device with same

An overvoltage protection circuit and overvoltage protection technology, which is applied to emergency protection circuit devices, overvoltage-responsive protection, circuit devices, etc., can solve problems such as complex circuit design

Inactive Publication Date: 2013-10-23
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overvoltage protection chip is an integrated circuit, and the circuit design is more complicated

Method used

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  • Overvoltage protection circuit and electronic device with same
  • Overvoltage protection circuit and electronic device with same

Examples

Experimental program
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Embodiment Construction

[0013] see figure 1 , which is a functional block diagram of the electronic device 100 in a preferred implementation manner. The electronic device 100 includes a power module 10 , a filter module 20 , an overvoltage protection module 30 , a switch module 40 and a load. In this embodiment, the electronic device 100 may be a vehicle-mounted electronic device such as a vehicle-mounted DVD player, a vehicle-mounted TV, and a vehicle-mounted refrigerator. In other implementation manners, the electronic device 100 is also a portable electronic device, which is powered by a car charger (ie, the power module 10 ), that is, the electronic device 100 does not include the power module 10 .

[0014] The power module 10 is used to output a supply voltage. In this embodiment, the power module 10 is an automobile engine.

[0015] The filter module 20 is used to filter the power supply voltage output by the power module 10 , and provide the filtered power supply voltage to the overvoltage ...

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Abstract

An electronic device powered by a voltage of a power supply includes a load, a switching module connected between the power supply and the load, and an overvoltage protection circuit. The overvoltage protection circuit comprises a control unit presetting a first predetermined voltage and an overvoltage protection unit. When the voltage is larger than the first predetermined voltage, the control unit generates a protection signal to control the overvoltage protection unit to generate a first control signal, the switching module cuts off an electrical connection between the power supply and the load in response to the first control signal.

Description

technical field [0001] The invention relates to an electronic device with an overvoltage protection circuit. Background technique [0002] Electronics can be powered by an on-board charger. The car charger provides operating voltage to electronic equipment through the engine inside the vehicle. During the sudden start or acceleration of the vehicle, the rotational speed of the engine changes, resulting in a sudden increase in the operating voltage. Under the impact of excessive voltage, the internal components of the electronic equipment may be burnt, thereby causing damage to the electronic equipment. In the prior art, a control unit and an overvoltage protection chip are usually arranged between the vehicle charger and the electronic equipment. The overvoltage protection chip is connected between the car charger and the control unit, and has a detection pin. The overvoltage protection chip controls the on and off of the switch unit by comparing the power supply voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/20
CPCH02H3/20H02H3/202
Inventor 汪涛邓雪冰程海龙马晓辉高行嵩李新平
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD