Power supply overvoltage protecting circuit
An overvoltage protection circuit and power supply technology, which is applied in emergency protection circuit devices, overvoltage-responsive protection, circuit devices, etc., can solve problems such as circuit device damage, power supply burnout, and power supply voltage uncontrollable, and achieve The effect of protecting the output terminal and preventing it from being damaged
Inactive Publication Date: 2013-01-02
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
[0002] The existing voltage stabilizing circuit usually uses Zener diode clamping at the output end of the power supply to control the voltage at the output end within a fixed range. circuit, but the voltage of the power supply itself cannot be controlled, and the power supply is still outputting voltage. When the voltage of the power supply itself is too high, it is easy to cause damage to the entire circuit device or burn out the power supply.
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[0011] See figure 1 , Which is a block diagram of a system 100 using the power supply overvoltage protection circuit 20 according to an embodiment of the present invention. The system 100 includes a power supply module 10, a power supply overvoltage protection circuit 20, and an output terminal 30 respectively connected to the power supply module 10 and the power supply overvoltage protection circuit 20. The output terminal 30 is used for connecting a load circuit. The power supply module 10 includes a power input control terminal Vin and a power output terminal Vout, and provides power to the output terminal 30 through the power output terminal Vout to supply power to the load. The power overvoltage protection circuit 20 is used to protect the load circuit connected to the output terminal 30 and to connect to the power supply module 10.
[0012] The power supply overvoltage protection circuit 20 includes an overvoltage response module 21 and a control module 22. One end of the ...
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The invention discloses a power supply overvoltage protecting circuit for performing overvoltage protection on a voltage output by a power supply module to an output end connected with a load. The power supply module comprises a power input control end and a power output end. The power output end is connected with the output end and used for supplying the voltage to the load connected with the output end. The power supply overvoltage protecting circuit comprises an overvoltage response module and a control module which are sequentially connected to the output end and the power input control end. The overvoltage response module conducts the control module when the voltage of the output end exceeds a rated voltage. The control module is conducted and then transmits a control signal to the power supply module to control the power supply module to stop outputting the voltage. Through the power supply overvoltage protecting circuit, the output end is protected, and elements and the power supply module of the power supply overvoltage protecting circuit can be effectively prevented from being damaged by overvoltage.
Description
Technical field [0001] The invention relates to a power supply overvoltage protection circuit. Background technique [0002] Existing voltage stabilizing circuits usually use a zener diode clamp at the output end of the power supply to control the voltage at the output end within a fixed range. However, this method can control the voltage at the output end within a fixed range to prevent burnout of the load. However, the voltage of the power supply itself cannot be controlled, and the power supply is still outputting voltage. When the voltage of the power supply itself is too high, it is easy to cause damage to the entire loop device or burn out of the power supply. Summary of the invention [0003] In view of this, it is necessary to provide a power supply overvoltage protection circuit, which can not only protect the output terminal, but also effectively prevent the components of the power supply overvoltage protection circuit and the power supply module from being damaged due t...
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IPC IPC(8): H02H7/00H02H3/20
CPCH02H3/202H02H7/00H02H3/20H02M1/32
Inventor 彭晓占邓雪冰高行嵩
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD