CN211744809U

CN211744809U - High-power LED illumination pulse constant current module

Info

Publication number: CN211744809U
Application number: CN202020101554.1U
Authority: CN
Inventors: 杨立杰; 俞玉春; 赵晓明; 姚璐; 吴尚
Original assignee: Suzhou Etron Technologies Co ltd
Current assignee: Suzhou Etron Technologies Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-10-23
Anticipated expiration: 2030-01-17

Abstract

The utility model discloses a high-power LED illumination pulse constant current module, which comprises a processor, an AC/DC power supply, an inversion half bridge, a power inductor, an output filtering module and an LED illumination module which are connected in sequence; the processor is also connected with the inverter half bridge, the power inductor and the output filtering module through the half bridge driving module, the current sampling module and the voltage sampling module respectively. The processor is also connected with an external dimming module, the external dimming signal is a device for adjusting the switch and the brightness of the LED externally, the processor firstly performs system self-checking, judges that the functions of the load and each functional component are normal, and provides a PWM control inversion half bridge with a certain frequency under the control of receiving the external dimming signal. The utility model discloses a working method of synchronous rectification step-down, electric energy conversion efficiency is high, and is fast through buck mode response speed simultaneously, has further reduced the output current ripple, has improved the output current quality. Reliable operation, strong practicability and convenient popularization.

Description

High-power LED illumination pulse constant current module

Technical Field

The utility model relates to a LED illumination field, in particular to high-power LED illumination pulse constant current module.

Background

The LED is a semiconductor device capable of converting electric energy into optical energy, has the characteristics of energy conservation, electricity saving, environmental protection, long service life and the like, and is popular among people. The LEDs have two requirements on the power supply, one is that the output voltage is greater than the on-state voltage of the LEDs, and the other is that the operating current is required to be stable. Most of LED constant current sources on the market have large current ripples, the current overshoot is large when the LED constant current sources are started, and the service life of the LED is influenced by long-time work.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is: the high-power LED illumination pulse constant current module realizes the voltage reduction constant current module realizing mode with constant output current, high electric energy conversion efficiency and pulse dimming.

The technical scheme of the utility model is that:

a high-power LED illumination pulse constant current module comprises a processor, and an AC/DC power supply, an inversion half bridge, a power inductor, an output filtering module and an LED illumination module which are sequentially connected; the processor is also connected with the inverter half bridge, the power inductor and the output filtering module through the half bridge driving module, the current sampling module and the voltage sampling module respectively.

Preferably, the processor is further connected with an external dimming module.

Preferably, the AC/DC power supply is a high-power voltage-stabilized power supply, and after being electrified, the AC/DC power supply provides a voltage exceeding the maximum working voltage of the LED lighting module.

Preferably, the processor receives a dimming signal sent by an external dimming module, provides PWM with a certain frequency according to the dimming signal, and controls the inverter half-bridge through the half-bridge driving module.

Preferably, the inverter half-bridge comprises an upper switching tube and a lower switching tube, and chopping is performed on the input voltage through the alternate conduction of the upper switching tube and the lower switching tube to output a pulse wave with a certain frequency and a certain duty ratio.

Preferably, the power inductor and output filtering module group filters the pulse wave into a smooth direct-current voltage for the load LED lighting module to use.

Preferably, the current sampling module feeds back the output current, and the processor adjusts the duty ratio according to the current feedback to stabilize the output current.

Preferably, the voltage sampling module provides output voltage feedback to achieve voltage limiting and protecting functions.

Preferably, the processor is also connected with an auxiliary power supply.

The utility model has the advantages that:

the utility model discloses a working method of synchronous rectification step-down, electric energy conversion efficiency is high, and is fast through buck mode response speed simultaneously, has further reduced the output current ripple, has improved the output current quality. Reliable operation, strong practicability and convenient popularization.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is the structure topological diagram of the high-power LED lighting pulse constant current module of the present invention.

Detailed Description

As shown in fig. 1, the high-power LED lighting pulse constant current module of the present invention comprises a processor, and an AC/DC power supply, an inverter half-bridge, a power inductor, an output filter module, and an LED lighting module, which are connected in sequence; the processor is also connected with the inverter half bridge, the power inductor and the output filtering module through the half bridge driving module, the current sampling module and the voltage sampling module respectively; the processor is also connected with an auxiliary power supply and an external dimming module.

The high-power AC/DC power supply supplies power to the whole system. The processor is a core component of the whole module, a PIC16F1668 device of Microchip company is adopted in the design, an 8-bit mcu processor and a power supply control chip capable of supporting analog output are integrated in the device, and the device not only supports software programming control but also supports hardware rapid adjustment. The inverter half-bridge is a main power device of the whole module and is formed by connecting two rapid high-voltage MOS tubes in series up and down. The half-bridge driver receives a driving signal from a processor and drives the inversion half-bridge to work. The power inductor plays the roles of energy storage and filtering. The output filtering plays a role in stabilizing voltage and filtering. The current sampling is sampling the output current. The voltage sampling is to sample the output voltage. The LED lighting module is an external load. The external dimming signal is a device for adjusting the on/off of the LED and the brightness externally, and supports communication modes such as pulse, simulation or 232. The auxiliary power supply provides power supply for modules such as a processor.

The AC/DC power supply is a high-power voltage-stabilized power supply and provides the maximum working voltage exceeding the LED lighting module after being electrified.

The processor firstly carries out system self-check, judges that the functions of the load and each functional component are normal, and receives the control of an external dimming signal to provide a PWM control inversion half-bridge with a certain frequency.

The inverter half bridge chops the input voltage through the alternate conduction of the upper tube and the lower tube to output pulse waves with certain frequency and duty ratio.

The power inductor and output filter module filters the pulse wave into smooth direct-current voltage for the load LED lighting module to use.

The current sampling module feeds back output current quickly, and the processor adjusts duty ratio quickly according to current feedback to enable the output current to be stable.

The voltage sampling module provides output voltage feedback and plays a role in voltage limiting and protection.

The processor performs various abnormal protection functions according to the information collected everywhere.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A high-power LED illumination pulse constant current module is characterized by comprising a processor, and an AC/DC power supply, an inversion half bridge, a power inductor, an output filtering module and an LED illumination module which are sequentially connected; the processor is also connected with the inverter half bridge, the power inductor and the output filtering module through the half bridge driving module, the current sampling module and the voltage sampling module respectively.

2. The high power LED lighting pulse constant current module set forth in claim 1, wherein the processor is further connected to an external dimming module.

3. The high power LED lighting pulse constant current module set forth in claim 2, wherein the AC/DC power supply is a high power regulated power supply, and provides a voltage exceeding the maximum operating voltage of the LED lighting module set after power-on.

4. The high-power LED lighting pulse constant current module according to claim 3, wherein the processor receives a dimming signal sent by an external dimming module, provides PWM with a certain frequency according to the dimming signal, and controls the inverter half-bridge through the half-bridge driving module.

5. The high-power LED lighting pulse constant-current module according to claim 4, wherein the inverter half-bridge comprises an upper switching tube and a lower switching tube, and the upper switching tube and the lower switching tube are alternately conducted to chop the input voltage and output a pulse wave with a certain frequency and a certain duty ratio.

6. The high power LED lighting pulse constant current module according to claim 5, wherein the power inductor and output filter module filters the pulse wave into a smooth DC voltage for the load LED lighting module.

7. The high-power LED illumination pulse constant current module set forth in claim 6, wherein the current sampling module feeds back an output current, and the processor adjusts a duty ratio according to the current feedback to stabilize the output current.

8. The high power LED lighting pulse constant current module set forth in claim 7, wherein the voltage sampling module provides output voltage feedback for voltage limiting and protection.

9. The high power LED lighting pulse constant current module set forth in claim 2, wherein the processor is further connected to an auxiliary power supply.