An adjustable contactor delay drive circuit
CN224696256UActive Publication Date: 2026-08-28SHENZHEN SUNFAR ELECTRIC TECH
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Patent Information
- Application Number
- CN202521926529.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-08
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2035-09-08
AI Technical Summary
Technical Problem
传统RC延时电路受温漂和压漂影响，精度较差；若逆变器EMI通过PCB走线耦合，RC节点电压跳变还将导致误触发
Benefits of technology
[0016]本接触器驱动电路可应用于顺序启停等固定延时场景，延时时长可调，具备较强的抗干扰能力和灵活性。本电路由延时电路、隔离电路、三极管驱动电路组成。延时电路利用电解电容、电阻、三极管、稳压管等元器件的特性，通过配置不同参数，可极其灵活地调整控制端延时时长；隔离电路利用光耦将控制端与驱动电路隔离，可有效防止浪涌等干扰、损坏控制端器件；三极管驱动电路采用两级放大电路，可通过负载接触器来进行三极管、限流电阻、和电源VDD选型，可实现同一电路多种应用场景。
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Abstract
An adjustable contactor delay drive circuit, comprising: a triode TR2, the emitter thereof being connected with a control signal, the base thereof being connected with the control signal through a resistor R2 and a resistor R1 in turn, a charging capacitor C1 being connected between the emitter and the base of the triode TR2, the collector thereof being connected with the ground through a resistor R3; a photo-coupler PC1, the anode of the light-emitting end thereof being connected with the collector of the triode TR2 through a resistor R4, the ground being connected with the cathode thereof, the emitter thereof being connected with the ground, the collector thereof being connected with the base of a triode TR1, the emitter of the triode TR1 being connected with a power supply VDD, the collector thereof being connected with the base of a triode TR3, the emitter of the triode TR3 being connected with the ground, the collector thereof being connected with a relay control signal RLY; the collector of the triode TR3 being further connected with the power supply VDD through a diode D1; the power supply VDD and the relay control signal RLY being connected with a terminal MC.
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