A power supply circuit for a street lamp

By setting a step-down unit in the street light power supply circuit and using the fourth transistor and the fifth Zener diode to form a circuit, the problem of unstable power supply to the control unit is solved, a stable power supply is achieved, and the power supply stability and voltage output reliability of the power supply circuit are improved.

CN224521230UActive Publication Date: 2026-07-17DONGGUAN SUKONDA NEW ENERGY LIGHTING CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
DONGGUAN SUKONDA NEW ENERGY LIGHTING CO LTD
Filing Date
2025-07-31
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing street lighting systems, the power supply stability of the control unit is difficult to guarantee.

Method used

Design a street light power supply circuit. By setting up a step-down unit, the voltage of the DC voltage output unit is reduced and stabilized. A circuit is formed by the fourth transistor and the fifth Zener diode to ensure that the power supply terminal of the control unit obtains a stable voltage.

Benefits of technology

This achieves stable power supply to the control unit, improving the power supply stability and voltage output reliability of the power supply circuit.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224521230U_ABST
    Figure CN224521230U_ABST
Patent Text Reader

Abstract

The utility model relates to hardware circuit technical field discloses a street lamp's power supply circuit, include: control unit, control unit has power end, DC voltage output unit, DC voltage output unit has first output end, voltage reducing unit, voltage reducing unit includes fourth triode Q4, fifth zener diode D5 and fifth resistance R5, the first end electricity of fourth triode Q4's collector and first output end and fifth resistance R5 is connected, the base of fourth triode Q4 and the cathode of fifth zener diode D5 and the second end electricity of fifth resistance R5 is connected, the anode of fifth zener diode D5 is grounded, the emitter of fourth triode Q4 and power end electricity is connected, the utility model discloses through setting voltage reducing unit, realizes the first output end of DC voltage output unit through fourth triode Q4 voltage reduction, and stably supplies power to the power end of control unit.
Need to check novelty before this filing date? Find Prior Art

Claims

1. A power supply circuit of a street lamp, characterized by comprising: include: Control unit, the control unit having a power supply terminal; A DC voltage output unit, wherein the DC voltage output unit has a first output terminal; The step-down unit includes a fourth transistor Q4, a fifth Zener diode D5, and a fifth resistor R5. The collector of the fourth transistor Q4 is electrically connected to the first output terminal and the first terminal of the fifth resistor R5. The base of the fourth transistor Q4 is electrically connected to the cathode of the fifth Zener diode D5 and the second terminal of the fifth resistor R5. The anode of the fifth Zener diode D5 is grounded. The emitter of the fourth transistor Q4 is electrically connected to the power supply terminal.

2. The circuit of claim 1, wherein, The step-down unit also includes a fourth capacitor C4. The first end of the fourth capacitor C4 is electrically connected to the emitter of the fourth transistor Q4 and the power supply terminal, and the second end of the fourth capacitor C4 is grounded.

3. The circuit of claim 1, wherein, The step-down unit further includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is electrically connected to the second end of the fourth resistor R4. The second end of the third resistor R3 is electrically connected to the first end of the fifth resistor R5 and the collector of the fourth transistor Q4. The second end of the fourth resistor R4 is electrically connected to the first output terminal.

4. The circuit of claim 3, wherein, The step-down unit also includes a third charging capacitor C3. The first end of the third charging capacitor C3 is electrically connected to the second end of the third resistor R3, the first end of the fifth resistor R5, and the collector of the fourth transistor Q4. The second end of the third charging capacitor C3 is grounded.

5. The circuit of claim 1, wherein, The power supply circuit also includes an optocoupler unit, the DC voltage output unit has a second output terminal, the control unit has a feedback terminal, the collector of the phototransistor in the optocoupler unit is electrically connected to the second output terminal, and the emitter of the phototransistor in the optocoupler unit is electrically connected to the feedback terminal.

6. The circuit of claim 5, wherein, The DC voltage output unit includes a rectifier bridge, a ninth diode D9, and a fifth capacitor C5. The first and second ends of the rectifier bridge are used to input AC voltage. The third end of the rectifier bridge is electrically connected to the anode of the ninth diode D9 and the first end of the fifth capacitor C5. The fourth end of the rectifier bridge and the second end of the fifth capacitor C5 are grounded. The anode of the ninth diode D9 serves as the first output terminal, and the cathode of the ninth diode D9 serves as the second output terminal.

7. The circuit of claim 6, wherein, The DC voltage output unit further includes a second fuse F2, a second inductor L2, and a second nineteenth resistor R29. The first end of the second fuse F2 is electrically connected to the third end of the rectifier bridge, the second end of the second fuse F2 is electrically connected to the first end of the second inductor L2 and the first end of the second nineteenth resistor R29, and the second end of the second inductor L2 and the second end of the second nineteenth resistor R29 are electrically connected to the anode of the ninth diode D9.

8. The circuit of claim 7, wherein, The DC voltage output unit further includes a 53rd resistor R53, a 54th resistor R54, a 29th capacitor C29, and a 45th capacitor C45; the first terminal of the 53rd resistor R53, the first terminal of the 29th capacitor C29, and the first terminal of the 45th capacitor C45 are electrically connected to the cathode of the 9th diode D9, and the second terminal of the 53rd resistor R53 is electrically connected to the first terminal of the 54th resistor R54; the second terminal of the 54th resistor R54, the second terminal of the 29th capacitor C29, the second terminal of the 45th capacitor C45, and the second terminal of the 5th capacitor C5 are grounded.

9. The circuit of claim 5, wherein, The circuit also includes a sixteenth Zener diode D16 and a thirty-second capacitor C32. The cathode of the sixteenth Zener diode D16 and the first terminal of the thirty-second capacitor C32 are electrically connected to the collector of the phototransistor, and the anode of the sixteenth Zener diode D16 and the second terminal of the thirty-second capacitor C32 are grounded.

10. The circuit of claim 5, wherein, The circuit also includes a sixth resistor R6, a seventh resistor R7, and a thirty-fifth capacitor C35. The first end of the sixth resistor R6 is electrically connected to the second end of the seventh resistor R7 and the feedback terminal. The second end of the sixth resistor R6 is electrically connected to the emitter of the phototransistor and the first end of the thirty-fifth capacitor C35. The second end of the thirty-fifth capacitor C35 and the first end of the seventh resistor R7 are grounded.