一种节能型汽车启动继电器线圈控制电路
By combining the power drive circuit and the pulse width trigger circuit, the problems of high drive current and high material cost of existing automotive starting relays are solved, realizing low current drive and protection, and improving the energy saving and reliability of the relay.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YICHANG CHEDI TECH CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-17
AI Technical Summary
Existing automotive starter relays with single-coil control have high drive current and are prone to damage, while dual-coil control increases material and manufacturing costs and results in a larger size.
The circuit employs a power drive circuit and a pulse width trigger circuit. The coil is switched on and off via a step-down circuit, and the current switching sequence is controlled by the pulse width trigger circuit. Combined with overvoltage and short-circuit protection circuits, it achieves low-current pull-in and maintains contact pull-in.
It achieves fewer components and lower current drive, reducing power consumption and heat generation, and improving the reliability and energy-saving effect of relays.
Smart Images
Figure CN224519796U_ABST
Abstract
Claims
1. An energy saving automobile starting relay coil control circuit, characterized by include: Power drive circuit, pulse width trigger circuit; The power drive circuit includes a step-down circuit, which is connected to coil L2 and is used to drive the on and off states of coil L2. The step-down circuit includes a power chip U1, which is connected to an overvoltage protection circuit and a coil drive voltage regulation circuit. The pulse width triggering circuit is connected to the coil drive voltage adjustment circuit.
2. The energy-saving automobile starting relay coil control circuit according to claim 1, characterized in that One end of the coil L2 is connected to the cathode of the freewheeling diode D2, and the other end of the coil L2 is connected to the anode of the freewheeling diode D2.
3. The energy-saving automobile starting relay coil control circuit according to claim 1, characterized in that The current limiting terminal of the power chip U1 is connected to one end of the current limiting resistor R4, and the other end of the current limiting resistor R4 is grounded. Adjusting the resistance value of the current limiting resistor R4 can set the magnitude of the short-circuit protection current.
4. The energy-saving automobile starting relay coil control circuit according to claim 1, characterized in that The step-down circuit includes a bootstrap capacitor C1, a filter capacitor C2, a filter capacitor C3, a filter inductor L1, and a rectifier diode D1. Pin ① of power chip U1 is connected to one end of bootstrap capacitor C1. The other end of bootstrap capacitor C1 is connected to pin ⑧ of power chip U1, the cathode of rectifier diode D1, and one end of filter inductor L1. The other end of filter inductor L1 is connected to one end of filter capacitor C2. The other end of filter capacitor C2 is grounded. The anode of rectifier diode D1 is connected to pin ⑦ of power chip U1, and pins ⑦, ⑥, and ⑨ of power chip U1 are all grounded; Pin ② of power chip U1 is connected to VCC terminal and one end of filter capacitor C3 respectively, and the other end of filter capacitor C3 is grounded.
5. The energy-saving automobile starting relay coil control circuit according to claim 1, characterized in that The overvoltage protection circuit includes a Zener diode VD1, resistors R1, R3, and R7, and a transistor Q1. The VCC terminal is connected to the cathode of Zener diode VD1. The anode of Zener diode VD1 is connected to one end of resistor R3 and one end of resistor R7, respectively. The other end of resistor R7 is grounded. The other end of resistor R3 is connected to the base of transistor Q1. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to one end of resistor R1 and pin ③ of power chip U1, respectively. Pin ③ of power chip U1 is the enable terminal. The other end of resistor R1 is connected to the VCC terminal.
6. The energy-saving automobile starting relay coil control circuit according to claim 1, characterized in that The coil drive voltage regulation circuit includes resistors R2, R5, R6, R8, and R9, and MOSFET Q2. One end of resistor R2 is connected to the other end of filter inductor L1, one end of resistor R6, pin ⑤ of power chip U1, and one end of coil L2. The other end of resistor R2 is connected to pin ⑤ of power chip U1, one end of resistor R5, one end of resistor R6, and one end of coil L2. The other end of resistor R5 is grounded, and the other end of coil L2 is grounded; The other end of resistor R6 is connected to the drain of MOSFET Q2, the source of MOSFET Q2 is grounded, the gate of MOSFET Q2 is connected to one end of resistor R8 and one end of resistor R9, the other end of resistor R9 is grounded, and the other end of resistor R8 is connected to the trigger pulse output terminal of the pulse width trigger circuit.
7. The energy-saving automobile starting relay coil control circuit according to claim 6, characterized in that The pulse width triggering circuit includes a Schmitt trigger U2, a regulated power supply, a first RC delay circuit, and a second RC delay circuit. Schmitt trigger U2 is connected to a regulated power supply, which in turn supplies power to Schmitt trigger U2. Schmitt trigger U2 is connected to the first RC delay circuit, which determines how long after power-on the Schmitt trigger U2 will start outputting a trigger pulse; Schmitt trigger U2 is connected to a second RC delay circuit, which determines the width of the trigger pulse output by U2; Pin 5 of the Schmitt trigger U2 is the pulse width output pin. Pin 5 is connected to the other end of resistor R8 and is used to control the on / off state of MOSFET Q2.
8. The energy-saving automobile starting relay coil control circuit according to claim 7, characterized in that The regulated power supply includes a Zener diode VD2 and a resistor R12. The VCC terminal is connected to the cathode of the Zener diode VD2, and the anode of the Zener diode VD2 is connected to pin 8 of the Schmitt trigger U2 and one end of the resistor R12. The other end of the resistor R12 is grounded.
9. The energy-saving automobile starting relay coil control circuit according to claim 7, characterized in that The first RC delay circuit includes a resistor R11 and a capacitor C5. Pin 2 of the Schmitt trigger U2 is connected to one end of the resistor R11 and one end of the capacitor C5, respectively. The other end of the resistor R11 is connected to the VCC terminal, and the other end of the capacitor C5 is grounded.
10. The energy-saving automobile starting relay coil control circuit according to claim 7, characterized in that The second RC delay circuit includes a resistor R10 and a capacitor C6. Pin 7 of the Schmitt trigger U2 is connected to one end of the resistor R10 and one end of the capacitor C6, respectively. The other end of the resistor R10 is connected to the VCC terminal, and the other end of the capacitor C6 is connected to pin 6 of the Schmitt trigger U2 and the ground terminal, respectively.