CN210807744U

CN210807744U - LED circuit with overload protection function

Info

Publication number: CN210807744U
Application number: CN201921240996.8U
Authority: CN
Inventors: 徐水盛
Original assignee: Dongguan Jiasheng Lighting Technology Co Ltd
Current assignee: Dongguan Jiasheng Lighting Technology Co Ltd
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2020-06-19
Anticipated expiration: 2029-08-01

Abstract

The utility model provides a LED circuit with overload protection function, includes input circuit, constant voltage constant current module, LED load, overload signal detection module, alarm indicator module, input circuit passes through constant voltage constant current module and connects on the LED load, overload signal detection module connects on the input of LED load, overload signal detection module still connects on constant voltage constant current module, alarm indicator module connects on overload signal detection module, overload signal detection module controls the circuit break-make of constant voltage constant current module according to detection information to the opening or closing of control LED load. And then realize LED's overload protection, effectively prolong LED's life, the practicality is strong, has stronger popularization meaning.

Description

LED circuit with overload protection function

Technical Field

The utility model relates to a lighting device structure especially relates to a LED circuit with overload protection function.

Background

For the supply circuit of the LED, if no protective measures are taken, the increased voltage leads to an increase in current, which over a certain time and magnitude will damage the LED. Some LED lamps or LED screens on the market always have the phenomenon that individual lamps or one lamp can not be lighted after long-term use, and the main reason is that the LED lamps are burnt out due to excessive heating life reduction caused by the fact that current exceeding a rated value flows for a long time. In view of the deficiencies of the prior art, there is a need for an improved conventional LED power supply circuit.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an LED circuit with an overload protection function to overcome the disadvantages in the prior art.

The utility model provides a LED circuit with overload protection function, includes input circuit, constant voltage constant current module, LED load, overload signal detection module, alarm indicator module, input circuit passes through constant voltage constant current module and connects on the LED load, overload signal detection module connects on the input of LED load, overload signal detection module still connects on constant voltage constant current module, alarm indicator module connects on overload signal detection module, overload signal detection module controls the circuit break-make of constant voltage constant current module according to detection information to the opening or closing of control LED load.

Further, the overload signal detection module comprises an MCU and an optocoupler, wherein a pin of the MCU is connected to a live wire at the input end of the LED load, the input end of the optocoupler is a light-emitting device, the output end of the optocoupler is a photosensitive device, the input end of the optocoupler is connected to an output pin of the MCU, and the output end of the optocoupler is connected to the constant-voltage constant-current module.

Further, the constant voltage and constant current module comprises a control chip U2, and the output end of the optical coupler is connected to the control chip U2.

The beneficial effects of the utility model reside in that: through setting up overload signal detection module, overload signal detection module detects the voltage information that LED load gathered the LED load input, and MCU controls constant voltage constant current module, alarm indication module work according to overload signal detection module's detection information, and then realizes LED's overload protection, effectively prolongs LED's life, and the practicality is strong, has stronger popularization meaning.

Drawings

Fig. 1 is a schematic diagram of connection between modules of the LED circuit with overload protection function.

Fig. 2 is a schematic diagram of the signal detection module and the alarm indicator light module of the LED circuit with the overload protection function shown in fig. 1 when connected with other modules.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

As shown in fig. 1-2, the utility model provides a LED circuit with overload protection function for to LED drive illumination and overload protection, it includes input circuit 10, constant voltage constant current module 20, LED load 30, overload signal detection module 40, alarm indicator module 50, input circuit 10 passes through constant voltage constant current module 20 and connects on LED load 30, overload signal detection module 40 connects on LED load 30's input, overload signal detection module 40 still connects on constant voltage constant current module 20, alarm indicator module 50 connects on overload signal detection module 40, overload signal detection module 40 controls the circuit break-make of constant voltage constant current module 20 according to detection information to control opening or closing of LED load 30.

The overload signal detection module 40 includes an MCU 41 and an optocoupler 42, a pin of the MCU 41 is connected to a live wire at an input end of the LED load 30, an input end of the optocoupler 42 is a light emitting device, an output end of the optocoupler 42 is a light sensing device, an input end of the optocoupler 42 is connected to an output pin of the MCU 41, an output end of the optocoupler 42 is connected to the constant voltage and constant current module 20, specifically, the constant voltage and constant current module 20 includes a control chip U2, and an output end of the optocoupler 42 is connected to the control chip U2.

When the output is overcurrent, the MCU 41 finishes detecting the output voltage through the PIN7, when it is detected that the output voltage exceeds the set overcurrent point, the PIN1 PIN of the MCU 41 outputs a high level signal, the optical coupler 42UF transmits the signal to the VDD PIN of the U2, at this time, the voltage of the VDD PIN of the U2 instantaneously becomes a low level, the U2 stops working, the constant voltage and constant current module 20 stops supplying power to the LED to protect the LED, the PIN7 PIN of the MCU 41 outputs a high level signal, and the indicator light of the alarm indicator light module 50 blinks inside.

The beneficial effects of the utility model reside in that: through setting up overload signal detection module 40, overload signal detection module 40 detects LED load 30 and gathers the voltage information of LED load 30 input, and MCU 41 controls constant voltage constant current module 20, the work of alarm indication module according to overload signal detection module 40's detection information, and then realizes LED's overload protection, effectively prolongs LED's life, and the practicality is strong, has stronger popularization meaning.

The above-described embodiments only represent one embodiment of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the spirit of the invention, and these are within the scope of the invention. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. The LED circuit with the overload protection function is characterized by comprising an input circuit, a constant voltage and constant current module, an LED load, an overload signal detection module and an alarm indicator lamp module, wherein the input circuit is connected to the LED load through the constant voltage and constant current module, the overload signal detection module is connected to the input end of the LED load, the overload signal detection module is further connected to the constant voltage and constant current module, the alarm indicator lamp module is connected to the overload signal detection module, and the overload signal detection module controls the on-off of a circuit of the constant voltage and constant current module according to detection information so as to control the on-off of the LED load.

2. The LED circuit with overload protection as recited in claim 1 wherein: the overload signal detection module comprises an MCU and an optocoupler, wherein a pin of the MCU is connected to a live wire at the input end of the LED load, the input end part of the optocoupler is a light-emitting device, the output end part of the optocoupler is a photosensitive device, the input end of the optocoupler is connected to an output pin of the MCU, and the output end of the optocoupler is connected to the constant-voltage constant-current module.

3. The LED circuit with overload protection as recited in claim 2 wherein: the constant voltage and constant current module comprises a control chip U2, and the output end of the optocoupler is connected to the control chip U2.