Passive switch drive controller for hybrid AC contactor based on opto-coupler

Abstract

The invention relates to a passive switch drive controller for a hybrid AC contactor based on an opto-coupler, comprising a resistor (R1), a capacitor (C1), a resistor (R2), a rectifier bridge (Z), a voltage regulator tube (W), a capacitor (C2), a resistor (R3), an opto-coupler (G3), a resistor (R4), a resistor (R5), a resistor (R6), a bidirectional thyristor (J1), a bidirectional thyristor (J2) and a bidirectional thyristor (J3). The characteristics of the thyristors are sufficiently utilized; a control circuit adopts the opto-coupler to realize separation of an excitation power supply of the contactor and electricity of a three-phase main circuit and unifiedly provides a switch signal controlled by the opto-coupler for a three-phase bidirectional thyristor; and a power supply and a current transformer are not required for configuration specially, so that the hybrid AC contactor based on opto-coupling separation and direct drive of switch control is realized. The passive switch drivecontroller not only realizes non-arc starting and disjunction, but also has the characteristics of simple control circuit, small volume, low cost, high performance index, strong universality, safety,reliability and the like.

Description

technical field [0001] The invention relates to a hybrid AC contactor passive switch drive controller based on an optocoupler, which belongs to the technical field of AC contactors. Background technique [0002] The hybrid AC contactor realizes arc-free connection and breaking, thereby ensuring the AC contactor has a high electrical life, greatly improving the operation reliability and performance indicators, Zhang Peiming and others published in the first issue of "Low Voltage Electrical Appliances" in 2001 The paper "New Intelligent Hybrid AC Contactor", Zheng Xin et al. published the paper "Research on Intelligent Hybrid Arcless AC Contactor" in "Low Voltage Electrical Appliances" No. 9, 2005, Zhang Peiming et al. obtained the patent "Intelligent Hybrid AC contactor" (Patent No. ZL00242121.6) has introduced the use of a single-chip microcomputer system to control the hybrid AC contactor using two or three thyristors without arc breaking. These are good solutions, but due ...

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Problems solved by technology

[0002] The hybrid AC contactor realizes arc-free connection and breaking, thereby ensuring the AC contactor has a high electrical life, greatly improving the operation reliability and performance indicators, Zhang Peiming and others published in the first issue of "Low Voltage Electrical Appliances" in 2001 The paper "New Intelligent Hybrid AC Contactor", Zheng Xin et al. published the paper "Research on Intelligent Hybrid Arcless AC Contactor" in "Low Voltage Electrical Appliances" No. 9, 2005, Zhang Peiming et al. obtained the patent "Intelligent Hybrid AC contactor" (Patent No. ZL00242121.6) has introduced the use of a single-chip microcomputer system to control the hybrid AC contactor using two or three thyristors without arc breaking. These are good solutions, but due to the realization of these solutions Intelligent control, the control system is relatively complicated, and independent power sources such as transformers or switching power supplies must be specially configured to electrically isolate the excitation power supply of the contactor from the main circuit and provide the power required by the control circuit. A current transformer must be configured to detect the main circuit. The circuit current, and the control signal output by the single-chip microcomputer system is connected in parallel to the control pole and cathode of the thyristor connected in parallel with the main contact, and the thyristor is in a waiting state through a large enough signal capacity, and the single-chip microcomputer system is Provide control signals for the three-phase thyristors respectively. Due to the high control requirements of the hybrid AC contactor, the control circuit is complicated and the cost is high. These solutions are very suitable for applications with high requirements. According to the research of AC contactors, the market demand for AC contactors with a large quantity and a wide range requires not only high-level and powerful intelligent hybrid AC contactors, but also performance indicators such as electrical life that are suitable for the needs of the majority of users. It is higher than ordinary AC contactors, but the circuit is a general-purpose hybrid AC contactor. Therefore, for the application of a large number of general-purpose AC contactors, it is required to propose a new general-purpose control scheme for hybrid AC contactors. The circuit is simple and the cost is low. The production is extremely easy, the volume is small, and the control circuit that can also achieve arc-free connection and breaking to achieve high performance indicators

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