CN211240181U

CN211240181U - LED dimming driving power supply

Info

Publication number: CN211240181U
Application number: CN201921820544.7U
Authority: CN
Inventors: 黄宇新; 吴观水
Original assignee: Huizhou Deai Electronic Technology Co ltd
Current assignee: Huizhou Deai Electronic Technology Co ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-08-11
Anticipated expiration: 2029-10-25

Abstract

The utility model relates to the technical field of LED driving power supplies, in particular to an LED dimming driving power supply, which comprises a dimming signal input circuit, an AC/DC conversion circuit, a microcontroller, a conduction angle detection circuit, a 0-10V input circuit and an output control circuit; the AC/DC conversion circuit is connected to a first analog-to-digital conversion port of the microcontroller; the 0-10V input circuit is connected to a second analog-to-digital conversion port of the microcontroller through a current-limiting resistor to form a 0-10V signal dimming input circuit; the dimming signal input circuit is connected to a third analog-to-digital conversion port of the microcontroller through the conduction angle detection circuit to form a silicon controlled dimming input circuit; and an output IO port of the microcontroller is connected with the output control circuit to form a dimming signal output circuit. The utility model discloses a utility model aims at providing a LED drive power supply that adjusts luminance adopts the utility model provides a technical scheme has solved the unable compatible technical problem of realization of current drive power supply that adjusts luminance.

Description

LED dimming driving power supply

Technical Field

The utility model relates to a LED drive power supply technical field, in particular to LED drive power supply that adjusts luminance.

Background

An LED dimming driving power supply is an electric device for changing the luminous flux of a light source in an illuminating device and adjusting the illumination level, and the effect of adjusting different brightness of light is achieved by reducing or increasing RMS voltage to promote the light output with different intensities generated by the light with average power.

The current dimming driving power supply mainly comprises: a thyristor dimming power supply, a 0-10V dimming power supply, a DALI dimming power supply, a DMX512 dimming power supply, and the like.

The LED driving power supply with the same output power can derive different driving power supplies naturally in order to adapt to different dimming modes and dimmers, and finally, the LED power supplies are various and cannot be compatible.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a utility model aims at providing a LED drive power supply that adjusts luminance adopts the utility model provides a technical scheme has solved the unable compatible technical problem of realization of current drive power supply that adjusts luminance.

In order to solve the technical problem, the utility model provides a LED dimming driving power supply, which comprises a dimming signal input circuit, an AC/DC conversion circuit, a microcontroller, a conduction angle detection circuit, a 0-10V input circuit and an output control circuit;

the AC/DC conversion circuit is connected to a first analog-to-digital conversion port of the microcontroller;

the 0-10V input circuit is connected to a second analog-to-digital conversion port of the microcontroller through a current-limiting resistor to form a 0-10V signal dimming input circuit;

the dimming signal input circuit is connected to a third analog-to-digital conversion port of the microcontroller through the conduction angle detection circuit to form a silicon controlled dimming input circuit;

and an output IO port of the microcontroller is connected with the output control circuit to form a dimming signal output circuit.

Preferably, the conduction angle detection circuit comprises an optical coupler for switching on and off signals, and the optical coupler is connected to a third analog-to-digital conversion port of the microcontroller through a current-limiting resistor.

Preferably, the output control circuit comprises a lightning protection circuit, an EMI filter circuit, a rectifier circuit, a gain control circuit, a secondary rectifier and filter circuit, a secondary bias voltage circuit, and an auxiliary output circuit.

By last, use the utility model provides a material car can obtain following beneficial effect: different pulse modulation PWM signals can be output to the power factor correction chip according to the output current or output voltage value of the LED driving power supply preset by the single-chip EEPROM memory, and the reference voltage value in the power factor correction chip is finely adjusted to realize the compensation of silicon controlled rectifier dimming; the dimming mode has no relation with the input commercial power, the commercial power cannot be polluted, the alternating current harmonic wave is small, and the power factor is high; the user can flexibly select the silicon controlled rectifier or 0-10V dimming, the user can select flexibility, the LED lamp is directly used for replacing the traditional lamp, the applicability is high, the compatibility is good, and the silicon controlled rectifier dimmer can be used for achieving the purpose of energy conservation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive faculty.

Fig. 1 is a connection block diagram of an LED dimming driving power circuit according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a driving power supply for dimming LED according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1-2, in order to solve the technical problem that the triac dimming power supply is incompatible with the 0-10V dimming power supply, the present embodiment provides an LED dimming driving power supply, which includes a dimming signal input circuit, an AC/DC conversion circuit 20, a microcontroller 10, a conduction angle detection circuit 40, a 0-10V input circuit 30, and an output control circuit 50.

The AC/DC conversion circuit 20 is connected to a first analog-to-digital conversion port of the microcontroller 10.

The 0-10V input circuit 30 is connected to the second analog-to-digital conversion port of the microcontroller 10 through a current-limiting resistor, so as to form a 0-10V signal dimming input circuit. The current-limiting resistor converts the signal into a 0-5V signal, and the microcontroller 10 detects the change of the 0-5V signal through ADC conversion, controls to output a PWM signal, and accordingly realizes dimming input of the 0-10V signal.

The dimming signal input circuit is connected to a third analog-to-digital conversion port of the microcontroller 10 through a conduction angle detection circuit 40 to form a silicon controlled dimming input line. The conduction angle detection module converts the detected dimming signal of the silicon controlled rectifier dimmer into a 0-5V signal, and the microcontroller 10 converts the dimming signal into a digital signal through the ADC and controls to output a PWM signal, so that the silicon controlled rectifier dimming input is realized.

The output IO port of the microcontroller 10 is connected to the output control circuit 50 to form a dimming signal output circuit. The dimming inputs of the two modes are both output to the output control circuit 50 through the microcontroller 10. The two dimming signals are not interfered with each other, and the dimming signals are automatically detected.

The LED dimming driving power supply provided by the embodiment can work independently or simultaneously by controlling the output part of the switching power supply, the silicon controlled dimming control circuit and the 0-10V dimming control circuit.

The silicon controlled rectifier dimming control circuit achieves the dimming effect through the on-off of a control signal, and therefore the conduction angle detection circuit 40 comprises an optical coupler for on-off of the signal, and the optical coupler is connected to a third analog-to-digital conversion port of the microcontroller 10 through a current-limiting resistor. The structure can convert the silicon controlled rectifier dimming signal into a 0-5V signal to a third analog-to-digital conversion port of the microcontroller 10, and after analog-to-digital conversion is completed, a PWM square wave with a certain duty ratio is output according to a certain conversion algorithm so as to realize silicon controlled rectifier dimming control. And different pulse modulation PWM signals are output to the power factor correction chip according to the output current or the output voltage value of the LED driving power supply preset by the single-chip EEPROM memory, and the reference voltage value in the power factor correction chip is finely adjusted, so that the compensation of the silicon controlled rectifier dimming is realized.

The 0-10V dimming control circuit converts a 0-10V signal into a 0-5V signal through the current-limiting resistor, outputs the 0-5V signal to a second analog-to-digital conversion port of the microcontroller 10, and outputs a PWM square wave with a certain duty ratio according to a certain conversion algorithm after analog-to-digital conversion is completed, so that 0-10V dimming control is realized.

In the two dimming control circuits, the microcontroller 10 can adopt an STM8S chip which is an 8-bit singlechip, and has a 10-bit ADC, a 16-bit timer is provided with a PWM output channel, the input ends of the thyristor conduction angle detection and 0-10V detection units are connected with the STM8S singlechip, and PWM signal output is controlled so as to realize accurate PWM digital dimming.

The AC/DC conversion circuit 20 may adopt a main control chip CR6841 with a "variable time control" mode, which may automatically reduce the switching period or skip some switching pulses or reduce the switching frequency under light load or no-load conditions, so as to achieve the purpose of reducing the standby power consumption.

In order to be suitable for different environments, the output control circuit 50 provided in the present embodiment further includes a lightning protection circuit, an EMI filter circuit, a rectifier circuit, a gain control circuit, a secondary rectifier and filter circuit, a secondary bias voltage circuit, and an auxiliary output circuit.

In summary, the LED dimming driving circuit provided in this embodiment has no relation between the dimming mode and the input mains supply, does not pollute the mains supply, and has small ac harmonic and high power factor; the controllable silicon dimming and the 0-10 dimming can be compatible, and the user selection flexibility and the applicability are high; the traditional lamp can be directly replaced by the LED lamp by using the silicon controlled rectifier dimmer so as to achieve the aim of energy conservation.

For the current LED market requiring quick response to customer demands and the management demand of company zero stock, the LED dimming driving power supply is expanded to a new market of 0-10V dimming, has the characteristics of lower cost and better dimming effect, and meets certain market requirements.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

1. The utility model provides a LED drive power supply that adjusts luminance which characterized in that: the device comprises a dimming signal input circuit, an AC/DC conversion circuit, a microcontroller, a conduction angle detection circuit, a 0-10V input circuit and an output control circuit;

2. The LED dimming driving power supply according to claim 1, wherein: the conduction angle detection circuit comprises an optical coupler for switching on and off signals, and the optical coupler is connected to a third analog-to-digital conversion port of the microcontroller through a current-limiting resistor.

3. The LED dimming driving power supply according to claim 1, wherein: the output control circuit comprises a lightning stroke protection circuit, an EMI filter circuit, a rectifying circuit, a gain control circuit, a secondary rectifying and filtering circuit, a secondary bias voltage circuit and an auxiliary output circuit.