一种路灯的调光电路

By connecting the zero-crossing detection module to the feedback winding of the transformer in the street light dimming circuit, the current returning to zero is detected in real time to control the switching of the MOSFET, which solves the problems of low efficiency and shortened lifespan of the MOSFET and achieves efficient brightness adjustment.

CN224521226UActive Publication Date: 2026-07-17DONGGUAN SUKONDA NEW ENERGY LIGHTING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
DONGGUAN SUKONDA NEW ENERGY LIGHTING CO LTD
Filing Date
2025-07-24
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing street lighting systems, the switching of MOSFETs at non-ideal times leads to low efficiency and shortened lifespan.

Method used

By connecting the zero-crossing detection module to the feedback winding of the transformer, the transformer current is detected to return to zero in real time, and the MOSFET is controlled to switch at this time, avoiding additional switching losses and improving the working efficiency and lifespan of the MOSFET.

Benefits of technology

This effectively avoids additional switching losses, improves the working efficiency and lifespan of the MOSFET, and ensures the efficient operation of the street light dimming circuit.

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Abstract

本实用新型涉及硬件电路技术领域，公开一种路灯的调光电路，包括：控制模块，控制模块具备驱动端和过零检测端；变压器，变压器具备初级绕组、次级绕组和反馈绕组，次级绕组用于给路灯的LED进行供电；MOS管，MOS管的栅极与驱动端电连接，MOS管的漏极与初级绕组的第一端电连接，初级绕组的第二端连接直流电源，MOS管的源级接地；过零检测模块，过零检测模块的输入端与反馈绕组的第一端电连接，过零检测模块的输出端与过零检测端电连接，反馈绕组的第二端接地。本实用新型将过零检测模块和MOS管连接同一变压器，确保MOS管能够在变压器电流归零时进行切换，从而避免产生额外的开关损耗，提高MOS管工作效率和寿命。
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Claims

1. A light adjusting circuit of a street lamp, characterized by comprising: include: The control module includes a drive terminal and a zero-crossing detection terminal. A transformer, comprising a primary winding, a secondary winding and a feedback winding, wherein the secondary winding is used to power the LEDs of the street light; The MOS transistor has its gate electrically connected to the driving terminal, its drain electrically connected to the first terminal of the primary winding, the second terminal of the primary winding connected to a DC power supply, and its source grounded. The zero-crossing detection module has its input terminal electrically connected to the first terminal of the feedback winding, its output terminal electrically connected to the zero-crossing detection terminal, and the second terminal of the feedback winding grounded.

2. The dimming circuit of claim 1, wherein, The zero-crossing detection module includes a second resistor R2 and a seventeenth resistor R17; The first end of the second resistor R2 is electrically connected to the second end of the seventeenth resistor R17 and the zero-crossing detection end. The second end of the second resistor R2 is electrically connected to the first end of the feedback winding. The first end of the seventeenth resistor R17 is grounded.

3. The dimming circuit of claim 1, wherein, The primary winding and the feedback winding are located on the same side of the transformer.

4. The dimming circuit of claim 1, wherein, The control module also has a current detection terminal, and the dimming circuit further includes a current detection module. The input terminal of the current detection module is electrically connected to the source of the MOS transistor, and the output terminal of the current detection module is electrically connected to the current detection terminal.

5. The dimming circuit of claim 4, wherein, The current detection module includes a thirteenth resistor R13 and a thirtieth resistor R30. The first end of the thirteenth resistor R13 is electrically connected to the source of the MOS transistor and the first end of the thirtieth resistor R30. The second end of the thirteenth resistor R13 is grounded, and the second end of the thirtieth resistor R30 is electrically connected to the current detection terminal.

6. The dimming circuit of claim 1, wherein, The dimming circuit further includes a fourth diode D4 and an eighth resistor R8. The anode of the fourth diode D4 is electrically connected to the gate of the MOS transistor, the cathode of the fourth diode D4 is electrically connected to the driving terminal, and the eighth resistor R8 is connected in parallel with the fourth diode D4.

7. The dimming circuit of claim 1, wherein, The control module also has a power supply terminal, and the dimming circuit also includes a transistor, a Zener diode and a fifth resistor R5; The collector of the transistor is electrically connected to the DC power supply and the first terminal of the fifth resistor R5. The base of the transistor is electrically connected to the cathode of the Zener diode and the second terminal of the fifth resistor R5. The anode of the Zener diode is grounded. The emitter of the transistor is electrically connected to the power supply terminal.

8. The dimming circuit of claim 7, wherein, The dimming circuit also includes a fourth capacitor C4, the first end of which is electrically connected to the emitter of the transistor, and the second end of which is grounded.

9. The dimming circuit of claim 7, wherein, The dimming circuit also includes a third resistor R3 and a fourth resistor R4 connected in series. The first end of the fourth resistor R4 is electrically connected to the DC power supply, the second end of the fourth resistor R4 is electrically connected to the first end of the third resistor R3, and the second end of the third resistor R3 is electrically connected to the collector of the transistor.