CN220798590U

CN220798590U - LED switch power supply

Info

Publication number: CN220798590U
Application number: CN202322430387.1U
Authority: CN
Inventors: 饶辉; 李丹丹; 曾招志
Original assignee: Dongguan Boyu Electronic Technology Co ltd
Current assignee: Dongguan Boyu Electronic Technology Co ltd
Priority date: 2023-09-07
Filing date: 2023-09-07
Publication date: 2024-04-16
Anticipated expiration: 2033-09-07

Abstract

The utility model relates to an LED switch power supply which has the characteristics of low power consumption and small circuit structure, and comprises an L end, an N end, a resistor R1, a capacitor C1, a rectifier bridge U1, a direct current bus capacitor C2, a photoresistor R3, a divider resistor R5, a switch tube Q1, a resistor R7, a Vout+ end and a Vout-end; the L end and the N end are used for externally connecting single-phase alternating current, the L end is connected in series to one alternating current input end of the rectifier bridge U1 through a resistor R1, the N end is connected with the other alternating current input end of the rectifier bridge U1, and a capacitor C1 is connected with the resistor R1 in parallel; the output end of the rectifier bridge U1 is respectively connected to a direct current positive bus and a direct current negative bus, a direct current bus capacitor C2 is bridged between the positive bus and the negative bus, the positive bus is connected to the negative bus through a photoresistor R3 and a divider resistor R5, the emitter of the switch tube Q1 is connected to the negative bus and the Vout-end through a resistor R7, the collector is connected to the positive bus and the Vout+ end, and the base is connected to a joint between the photoresistor R3 and the divider resistor R5; the Vout+ end and the Vout-end are used for externally connecting an LED load.

Description

LED switch power supply

Technical Field

The utility model relates to the field of power supplies, in particular to an LED switching power supply.

Background

The led switching power supply is a power supply which utilizes the modern power electronic technology to control the switching tube to be turned on and off, and has important significance in the aspects of energy conservation and environmental protection in development and application.

The LED switch power supply on the market at present basically comprises an alternating current-direct current (AC-DC), a buck-boost module and a switch tube, and controls the switch tube through a photosensitive device to realize the lighting at daytime and night, and the defects of complex circuit structure and high power consumption are commonly existed.

Disclosure of Invention

The utility model provides an LED switch power supply with low power consumption and small circuit structure for improving the defects in the prior art.

Therefore, the LED switching power supply comprises an L end, an N end, a resistor R1, a capacitor C1, a rectifier bridge U1, a direct current bus capacitor C2, a photoresistor R3, a divider resistor R5, a switching tube Q1, a resistor R7, a Vout+ end and a Vout-end; the L end and the N end are used for externally connecting single-phase alternating current, the L end is connected in series to one alternating current input end of the rectifier bridge U1 through a resistor R1, the N end is connected with the other alternating current input end of the rectifier bridge U1, and a capacitor C1 is connected with the resistor R1 in parallel; the output end of the rectifier bridge U1 is respectively connected to a direct current positive bus and a direct current negative bus, a direct current bus capacitor C2 is bridged between the positive bus and the negative bus, the positive bus is connected to a negative bus through a photoresistor R3 and a divider resistor R5, the emitter of the switch tube Q1 is connected to the negative bus and a Vout-end through a resistor R7, the collector is connected to the positive bus and the Vout+ end, and the base is connected to a joint between the photoresistor R3 and the divider resistor R5; and the Vout+ end and the Vout-end are used for externally connecting an LED load.

Further, the circuit breaker also comprises a switch S1 and a resistor R2, wherein a branch formed by connecting the switch S1 and the resistor R2 in series is connected with two ends of the voltage dividing resistor R5 in parallel. The switch S1 is a wifi control switch, a Bluetooth switch or an infrared remote sensing switch.

Further, the switching tube also comprises a resistor R4, and the base electrode of the switching tube Q1 is connected to the junction between the photoresistor R3 and the divider resistor R5 through the resistor R4.

Further, the switching tube Q1 is configured as an IGBT.

Further, the surge protection fuse F1 is connected in series between the L end and the resistor R1.

Further, the resistor R6 is connected in series on the positive bus.

Further, the protection diode D1 is connected between the emitter and the collector of the switching tube Q1 in an anti-parallel mode; and/or the LED further comprises a unidirectional conduction diode D2, wherein the anode of the unidirectional conduction diode D2 is connected with the positive bus, and the cathode is connected with the Vout+ end.

Compared with the prior art, the LED power supply circuit disclosed by the utility model has the advantages that the capacitor C1 does not consume active power, the power consumed by the resistor R1 is lower, the power consumption can be lower, the number of devices used in the whole circuit structure is less, the cost is low, and the topology simplification advantage is realized.

Drawings

The utility model will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the utility model, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.

Fig. 1 is a circuit schematic of an LED power supply circuit of the present utility model.

Detailed Description

The utility model will be further described with reference to the following examples.

The power supply circuit of the embodiment is shown in fig. 1, and includes an L end, an N end, a resistor R1, a capacitor C1, a rectifier bridge U1, a dc bus capacitor C2, a photo resistor R3, a voltage dividing resistor R5, a switching tube Q1, a resistor R7, a vout+ end, and a Vout-end; the L end and the N end are used for externally connecting single-phase alternating current, the L end is connected in series to one alternating current input end of the rectifier bridge U1 through a resistor R1, the N end is connected with the other alternating current input end of the rectifier bridge U1, and a capacitor C1 is connected with the resistor R1 in parallel; the output end of the rectifier bridge U1 is respectively connected to a direct current positive bus and a direct current negative bus, a direct current bus capacitor C2 is bridged between the positive bus and the negative bus, the positive bus is connected to the negative bus through a photoresistor R3 and a divider resistor R5, the emitter of the switch tube Q1 is connected to the negative bus and the Vout-end through a resistor R7, the collector is connected to the positive bus and the Vout+ end, and the base is connected to a joint between the photoresistor R3 and the divider resistor R5; the Vout+ end and the Vout-end are used for externally connecting an LED load.

When the device works, unidirectional alternating current is subjected to voltage reduction and current limiting through a resistor R1 and a capacitor C1, then is rectified through a rectifier bridge U1 to form direct current with proper size, the voltage reduction and current limiting amplitude can be controlled through R1 and C1 parameters, the direct current is output to positive and negative buses, and C2 is used for filtering and smoothing voltage waves. Because the capacitor C1 does not consume active power, the resistor R1 consumes lower power, the power consumption of the circuit can be lower, and low power consumption is realized.

After rectification, the voltage on the direct current bus is divided by a photoresistor R3 and a voltage dividing resistor R5, the divided voltage controls a switching tube Q1, during daytime, the voltage divided to the base electrode of the switching tube Q1 is larger because the resistance value of the photoresistor R3 with sufficient light is smaller, the Q1 is conducted, at the moment, the current flows back through the Q1 and the R7, the LED load does not work, and the R7 prevents short circuit; at night, the resistance value of the photoresistor R3 rises to a larger level, the voltage is divided and pulled up, the Q1 is cut off, current flows into the LED load for working, and the LED emits light.

The whole circuit structure has the advantages of fewer devices, low cost and topology simplification.

As an improvement scheme, if the lighting or the extinction of the LED needs to be manually controlled and is not affected by the light, a switch S1 and a resistor R2 may be provided, a branch formed by connecting the switch S1 and the resistor R2 in series is connected in parallel to two ends of a voltage dividing resistor R5, when the switch S1 is turned on, the resistor R2 and the resistor R3 are connected in parallel to reduce the resistance value, the switch S1 is turned on and turned off, and the circuit is restored to be controlled by the light. More preferably, to satisfy the smart home concept, the switch S1 may be configured as a WIFI control switch, and may be remotely controlled, for example, away from home, through WIFI, or may be controlled wirelessly, for example, through a bluetooth switch or an infrared remote sensing switch, to achieve a short-range, low-cost wireless control.

On the basis of the manual control with the S1, a base electrode of the switching tube Q1 can be connected to a junction between the photoresistor R3 and the divider resistor R5 through a resistor R4, and the resistor R4 protects the base electrode of the Q1. And/or, the switching tube Q1 is configured as an IGBT so as to provide the voltage-resistant performance, so that the circuit can reliably work.

As another improvement, the surge protection fuse F1 is connected in series between the L end and the resistor R1, and is used for fusing protection of the circuit in case of power grid fluctuation or lightning surge.

In the utility model, a resistor R6 is connected in series on a positive bus for controlling output impedance matching; the protection diode D1 is reversely connected between the emitter and the collector of the switching tube Q1 in parallel and is used for further protecting the switching tube; the anode of the unidirectional conduction diode D2 is connected with a positive bus, and the cathode is connected with the Vout+ end, so that the influence of the LED load on the power supply of the front-stage circuit is isolated; the capacitor C3 is connected with the resistor R7 in parallel for filtering.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the scope of protection of the present application, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An LED switching power supply, characterized in that:

the device comprises an L end, an N end, a resistor R1, a capacitor C1, a rectifier bridge U1, a direct current bus capacitor C2, a photoresistor R3, a divider resistor R5, a switch tube Q1, a resistor R7, a Vout+ end and a Vout-end;

the L end and the N end are used for externally connecting single-phase alternating current, the L end is connected in series to one alternating current input end of the rectifier bridge U1 through a resistor R1, the N end is connected with the other alternating current input end of the rectifier bridge U1, and a capacitor C1 is connected with the resistor R1 in parallel;

the output end of the rectifier bridge U1 is respectively connected to a direct current positive bus and a direct current negative bus, a direct current bus capacitor C2 is bridged between the positive bus and the negative bus, the positive bus is connected to a negative bus through a photoresistor R3 and a divider resistor R5, the emitter of the switch tube Q1 is connected to the negative bus and a Vout-end through a resistor R7, the collector is connected to the positive bus and the Vout+ end, and the base is connected to a joint between the photoresistor R3 and the divider resistor R5;

and the Vout+ end and the Vout-end are used for externally connecting an LED load.

2. The LED switching power supply of claim 1, wherein: the circuit breaker also comprises a switch S1 and a resistor R2, wherein a branch formed by connecting the switch S1 and the resistor R2 in series is connected with two ends of the divider resistor R5 in parallel.

3. The LED switching power supply of claim 2, wherein: the switch S1 is a wifi control switch, a Bluetooth switch or an infrared remote sensing switch.

4. The LED switching power supply of claim 2, wherein: the base electrode of the switch tube Q1 is connected to the junction between the photoresistor R3 and the divider resistor R5 through the resistor R4.

5. The LED switching power supply of claim 4, wherein: the switching tube Q1 is configured as an IGBT.

6. The LED switching power supply of claim 1, wherein: and a surge protection fuse F1 connected in series between the L end and the resistor R1.

7. The LED switching power supply of claim 1, wherein: and the resistor R6 is connected in series on the positive bus.

8. The LED switching power supply of claim 1, wherein: the protection diode D1 is connected between the emitter and the collector of the switching tube Q1 in anti-parallel mode; and/or the LED further comprises a unidirectional conduction diode D2, wherein the anode of the unidirectional conduction diode D2 is connected with the positive bus, and the cathode is connected with the Vout+ end.