High-reliability isolated high-voltage switching circuit

Abstract

The invention discloses a high-reliability isolated high-voltage switching circuit, and aims to provide an isolated high-voltage switching circuit which is applied to high-voltage-input to high-voltage-output products, adopts a small signal to control a high-voltage device, is simple in structure, safe and reliable, has wide product application range, is used in the field of high pressure defogging, lighting, heating fan, motor and the like. The high-reliability isolated high-voltage switching circuit is characterized in that: a high-voltage control unit comprises an optical coupler U1 and a bidirectional silicon controlled rectifier control circuit, wherein the bidirectional silicon controlled rectifier control circuit comprises a bidirectional silicon controlled rectifier M1 of which a Gelectrode is connected to the controlled side of the optical coupler; the input side of an integrating circuit is connected with a control signal input port P1; and a power supply control unit comprises an MOS tube; a G electrode of the MOS tube is connected to a collector electrode of a triode Q1, a D electrode of the MOS tube is connected to a power supply VCC, a resistor R3 is connected between an S electrode of the MOS tube and a first pin of the optical coupler U1, and a resistor R12 is connected between the S electrode of the MOS tube and an emitter electrode of the triode Q1. The high-reliability isolated high-voltage switching circuit is applicable to the technical field of switching circuits.

Description

technical field

[0001] The invention relates to the technical field of switch circuits, more specifically, to a high-reliability isolated high-voltage switch circuit. Background technique

[0002] At present, all output control signals are basically sent to the control unit in the form of single-chip output. The core of this application is solved. When the control signal is abnormal or crashes and runs away, the control will fail. If the load cannot be timely Cutting off the output may cause serious consequences at the back end, causing property and personnel casualties. I just considered this. In order to avoid major property and personnel casualties, we will make an automatic crash or run away on the circuit. The control circuit to avoid. Contents of the invention

[0003] Aiming at the deficiencies and defects of the existing technology, a kind of application in the high-voltage input to high-voltage output side products is provided, and the small signal is used to con...

Examples

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] see Figure 1-2 As shown, a kind of highly reliable isolated high voltage switch circuit of the present invention comprises:

[0019] The high-voltage control unit includes an optocoupler U1 and a triac control circuit, the triac control circuit includes a triac M1 whose G pole is connected to the controlled side of the optocoupler U1, and the triac T1 Pole and T2 are controlled by the main circuit of the load. When the optocoupler U1 is turned on, the bidirectional thyristor M1 is driven to output with load, and when the optocoupler U1 is turned off, the bidirectional thyristor M1 is driven to turn off the load;

[0020] The No. 1 pin of the optocoupler U1 is electrically connected to a first signal processing unit and a power supply control unit, the first signal processing unit includes an integrating circuit, and the input side of t...

technical field

[0001] The invention relates to the technical field of switch circuits, more specifically, to a high-reliability isolated high-voltage switch circuit. Background technique

[0002] At present, all output control signals are basically sent to the control unit in the form of single-chip output. The core of this application is solved. When the control signal is abnormal or crashes and runs away, the control will fail. If the load cannot be timely Cutting off the output may cause serious consequences at the back end, causing property and personnel casualties. I just considered this. In order to avoid major property and personnel casualties, we will make an automatic crash or run away on the circuit. The control circuit to avoid. Contents of the invention

[0003] Aiming at the deficiencies and defects of the existing technology, a kind of application in the high-voltage input to high-voltage output side products is provided, and the small signal is used to con...

Examples

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] see Figure 1-2 As shown, a kind of highly reliable isolated high voltage switch circuit of the present invention comprises:

[0019] The high-voltage control unit includes an optocoupler U1 and a triac control circuit, the triac control circuit includes a triac M1 whose G pole is connected to the controlled side of the optocoupler U1, and the triac T1 Pole and T2 are controlled by the main circuit of the load. When the optocoupler U1 is turned on, the bidirectional thyristor M1 is driven to output with load, and when the optocoupler U1 is turned off, the bidirectional thyristor M1 is driven to turn off the load;

[0020] The No. 1 pin of the optocoupler U1 is electrically connected to a first signal processing unit and a power supply control unit, the first signal processing unit includes an integrating circuit, and the input side of t...

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