A surge-proof circuit

Abstract

The invention provides a surge-proof circuit, comprising: a first diode, a second diode, a third diode, a fourth diode and a first varistor; The positive electrode of the first diode is connected withthe positive electrode of the fourth diode, the negative electrode of the first diode is connected with the positive electrode of the second diode, the negative electrode of the second diode is connected with the negative electrode of the third diode, and the positive electrode of the third diode is connected with the negative electrode of the fourth diode; The negative electrode of the first diode is connected with a neutral line, and the negative electrode of the fourth diode is connected with a live wire; A first end of the first varistor is connected to a negative electrode of the fourthdiode, and a second end of the first varistor is connected to a positive electrode of the fourth diode; The positive electrode of the fourth diode is connected to DC ground. The invention provides a surge-proof circuit, which can improve the surge-proof effect.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an anti-surge circuit. Background technique [0002] Equipment placed outdoors, such as the outdoor unit of the air conditioner, may be struck by lightning. If the power line is struck by lightning, the instantaneous high voltage enters the equipment such as the outdoor unit of the air conditioner, and the surge resistance of these devices is poor, which will directly cause the equipment to circuit board fails. [0003] In the prior art, the anti-surge is mainly implemented by using a fuse. A fuse is installed on the fire line. When a surge voltage is generated, the circuit board is protected by blowing the fuse. However, the blowing of the fuse takes a certain amount of time. During this time, the circuit board may have been damaged, and the anti-surge effect is poor. Contents of the invention [0004] The embodiment of the present invention provides a circuit for preven...

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Problems solved by technology

[0002] Equipment placed outdoors, such as the outdoor unit of the air conditioner, may be struck by lightning. If the power line is struck by lightning, the instantaneous high voltage enters the equipment such as the outdoor unit of the air conditioner, and the surge resistance of these devices is poor, which will directly cause the equipment to circuit board failure

[0003] In the prior art, the anti-surge is mainly implemented by using a fuse. A fuse is installed on the fire line. When a surge voltage is generated, the circuit board is protected by blowing the fuse. However, the blowing of the fuse takes a certain amount of time. During this time, the circuit board may have been damaged, and the anti-surge effect is poor.

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