An overvoltage protection device
An overvoltage protection device and voltage regulator technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as accidents, equipment impact, limitation of working power supply voltage range, etc., and achieve the effect of preventing damage and working safely and reliably
Active Publication Date: 2019-07-02
SHENZHEN POWER SUPPLY BUREAU +1
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Problems solved by technology
[0002] For most electrical equipment, the voltage range of the working power supply is strictly limited. Overvoltage will seriously affect the operation of the equipment, cause damage to the equipment, and even cause accidents in serious cases. Therefore, the power supply of the electrical equipment is monitored in real time. and protection, it is very necessary to ensure the normal operation of electrical equipment
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[0013] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0014] Such as figure 1 As shown, an overvoltage protection device according to the present invention includes a power supply circuit, a voltage detection circuit and a trigger circuit, the circuit is used to provide power, the voltage detection circuit is used to detect the power supply voltage, and the drive circuit is used to drive the relay to work. Therefore, the power supply is disconnected in time when an overvoltage occurs.
[0015] The power supply circuit includes a bridge rectifier circuit V1 and ...
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The invention discloses an over-voltage protection device comprising a power supply circuit, a voltage detection circuit and a trigger circuit. The power supply circuit is used for providing a power supply. The voltage detection circuit is used for detecting a power supply voltage. A driving circuit is used for driving a relay to work so as to disconnect the power supply timely in an over-voltagestate. The power supply circuit consists of a bridge type rectifier circuit V1 and a voltage regulator. The voltage detection circuit employs six Schmitt triggers. The trigger circuit includes a six resistor connected to a sixth diode and a first triode; a base electrode of the first triode is grounded through a fifth capacitor, an emitter of the first triode is grounded, and a collector of the first triode is connected with the input terminal of the voltage regulator by a coil of the relay; and the two ends of the coil of the relay are connected in parallel with a ninth diode. According to the invention, the power of an electrical device can be disconnected timely when an over-voltage phenomenon occurs and thus the electrical device is protected from being damaged in a too high voltage state, so that the electrical device works safely and reliably.
Description
technical field [0001] The invention relates to the technical field of electrical equipment protection, in particular to an overvoltage protection device. Background technique [0002] For most electrical equipment, the voltage range of the working power supply is strictly limited. Overvoltage will seriously affect the operation of the equipment, cause damage to the equipment, and even cause accidents in serious cases. Therefore, the power supply of the electrical equipment is monitored in real time. And protection is very necessary to ensure the normal operation of electrical equipment. Contents of the invention [0003] The purpose of the present invention is to provide an industrial power supply protection device, which can disconnect the power supply of the electrical equipment in time when the power supply of the electrical equipment is overvoltage, and automatically power on when the power supply is restored, so as to ensure the safety and reliability of the electric...
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IPC IPC(8): H02H7/125
CPCH02H7/125
Inventor 常胜
Owner SHENZHEN POWER SUPPLY BUREAU