CN203151818U - Multi-mode light adjustment control and constant current driving circuit used for LED lighting - Google Patents

Abstract

The utility model relates to a multi-mode dimming control and constant current drive circuit for LED lighting, which is characterized in that it comprises a constant current drive power module, a dimming decoding module and a constant current drive output The current drive power supply module includes a rectification and filtering module, a PFC correction module, a voltage conversion switch module and a PWM control module connected in sequence; the dimming decoding module includes a dimming decoding unit and a dimming signal interface, and the power supply of the dimming decoding unit The input terminal is connected to the output terminal of the voltage conversion switch module, the signal input terminal of the dimming decoding unit is connected to the dimming signal interface, and the signal output terminal of the dimming decoding unit is connected to the constant current drive output module. The utility model not only solves the problem that traditional lighting dimming signals cannot be directly used for LED lighting dimming, but also can replace and use different dimming decoding modules according to the signal conversion requirements of different users and different dimming systems.

Description

Multi-mode dimming control and constant current drive circuit for LED lighting

technical field

The utility model relates to the field of LED lighting control, in particular to a multi-mode dimming control and constant current drive circuit for LED lighting.

Background technique

LED lighting is the third-generation light source recognized globally in recent years. LED lighting products have gradually attracted widespread attention due to their energy-saving, environmental protection, and long-life characteristics. increasingly familiar to the general public. The wide application of LED lighting also meets the government's requirements for energy conservation and emission reduction. At present, governments of various countries are actively eliminating low-efficiency lighting products. The European Union has completely banned the import or production of traditional incandescent lamps. my country has also begun to promote energy-saving products on a large scale and eliminate low-efficiency products.

Because LED is a kind of light-emitting diode element, it is easy to realize different combinations of its power, shape and function by using different numbers of LEDs, so it is widely used. Similarly, it is also easy to realize electronic functions to control its brightness and change. However, LED lighting requires LED drivers different from fluorescent ballasts. For example, a constant current switching power supply provides a constant operating current for LEDs, which can avoid damage to LED chips caused by current overload, and can also avoid color temperature changes under different current conditions. Therefore, the use of constant current switching power supply for LED lighting has been generally accepted by the industry. At the same time, PWM (pulse width modulation) dimming technology is also recognized as the most suitable dimming method by the LED lighting industry.

However, the LED lighting driven by a constant current switching power supply cannot directly adopt the existing dimming system to realize the dimming function. Traditional lighting dimming systems, such as 0/1-10V linear dimming systems, provide a 1-10V linear analog dimming signal, which has been widely used in traditional dimming systems. DALI digital dimming technology is the abbreviation of Digital Addressable Lighting Interface (Digital Addressable Lighting Interface). DALI provides communication rules for lighting components as part of the IEC60929 standard, and has been widely used in existing lighting control systems. However, the 0/1-10V dimming system widely used in traditional lighting only provides linear analog dimming signals, and cannot directly output PWM dimming signals, and the PWM dimming signals used in DALI digital dimming technology are also similar to LED lighting. The required PWM dimming signal is different. If LED lighting fixtures are to be used to partially or completely replace traditional lamps, large-scale changes to existing electrical wiring will be required. The incompatibility between the existing dimming technology and the LED dimming control scheme has caused many obstacles to the promotion of LED lighting.

Therefore, it is necessary to develop a conversion device that converts traditional dimming signals into PWM dimming signals recognizable by LED drivers, so that LED lighting fixtures can be more widely used and promoted without changing the existing electrical wiring. .

Chinese utility model patent ZL201010547782.2 discloses an LED constant current control device under PWM constant current mode, which discloses a PWM constant current method and a dimming method based on PWM constant current mode. However, in this patent, the functional unit that realizes PWM dimming signal control is connected between the output of the constant current power supply and the LED lighting load, and indirectly determines the PWM dimming signal through photosensitive devices and current sampling. The size of the LED lighting load is related. Once the application requirements change, that is, the power output and the load size change, the related circuit design and component parameters must also be changed accordingly to work stably, which increases the use of the product. the type of product.

Utility model content

The purpose of this utility model is to provide a versatile and flexible multi-mode dimming control and constant current drive circuit for LED lighting, so as to realize the direct connection of LED lighting fixtures to the existing traditional multi-mode It can be used in the lighting circuit without changing the wiring of the existing power supply and dimming system.

In order to achieve the above object, the utility model adopts the following technical solutions:

A multi-mode dimming control and constant current drive circuit for LED lighting, comprising a constant current drive power supply module connected to each other, a dimming decoding module and a constant current drive output module, the constant current drive power supply module includes sequentially connected rectification and filtering module, PFC correction module, voltage conversion switch module and PWM control module; the dimming decoding module includes a dimming decoding unit and a dimming signal interface, and the power input terminal of the dimming decoding unit is connected to the voltage conversion switch module The output terminal is connected, the signal input terminal of the dimming decoding unit is connected with the dimming signal interface, and the signal output terminal of the dimming decoding unit is connected with the constant current drive output module.

The constant current drive output module includes a constant current control module and a current detection module, the power input terminals of the constant current control module and the current detection module are respectively connected to the output terminals of the voltage conversion switch module, and the signal input terminals of the constant current control module It is connected with the signal output terminal of the dimming decoding unit, the output terminal of the constant current control module is connected with the signal input terminal of the current detection module, and the output terminal of the current detection module is connected with the external LED lighting load.

The current detection module is also connected with the current feedback terminal of the constant current control module.

The dimming decoding unit is a 0/1-10V dimming decoding unit, and the dimming signal interface is a 0/1-10V dimming signal interface.

The dimming decoding unit is a DALI dimming decoding unit, and the dimming signal interface is a DALI dimming signal interface.

The dimming decoding module also includes a PWM dimming signal interface, and the PWM dimming signal interface is connected to the signal input terminal of the constant current control module.

The 0/1-10V dimming decoding unit includes a PIC16F616 chip produced by MICROCHIP Company and a bypass circuit connected thereto.

The DALI dimming decoding unit includes a uPD78F0756 chip produced by RENESAS and a bypass circuit connected thereto.

Each output end of the voltage conversion switch module is also connected to the voltage feedback input end of the PWM control module.

The current detection module is connected to the 32V~57V voltage output terminal of the voltage conversion switch module; the constant current control module is connected to the 12V voltage output terminal of the voltage conversion switch module; the dimming decoding unit is connected to the 5.1V voltage output terminal of the voltage conversion switch module Connect, and also connect with the 12V voltage output terminal.

The multi-mode dimming control and constant current drive circuit for LED lighting provided by the utility model not only solves the problem that the traditional lighting dimming signal cannot be directly used for LED lighting dimming, but also can be adjusted according to different users and different lighting conditions. The signal conversion requirements of the system, replace and use different dimming decoding modules. By converting traditional lighting dimming signals into PWM dimming signals available to LED drive circuits, it is possible to replace traditional lighting loads with dimming functions with LED lighting loads without changing the wiring of the existing power supply and dimming systems . At the same time, the constant current drive output module can not only realize PWM dimming, but also set the corresponding constant current value according to the size of the LED lighting load, which is more extensive, convenient and flexible than other LED constant current power supplies with built-in dimming units. Realize mass production and save unnecessary manufacturing costs.

Description of drawings

FIG. 1 is a structural block diagram of an LED constant current control device in a PWM constant current mode in the prior art.

Fig. 2 is a structural schematic diagram of an embodiment of the utility model.

FIG. 3 is a schematic circuit diagram of a DALI dimming decoding unit in an embodiment of the present invention.

FIG. 4 is a schematic circuit diagram of a 0/1-10V dimming decoding unit in an embodiment of the present invention.

Detailed ways

The content of the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , it is a structural block diagram of a disclosed LED constant current control device under PWM constant current mode. The functional unit that realizes PWM dimming signal control is connected between the constant current power supply output and LED lighting load, and indirectly determines the PWM dimming signal through photosensitive devices and current sampling. The realization of PWM dimming is closely related to the constant current power supply and LED lighting load. Once the application requirements change, that is, the power output and load size change, the relevant circuit design and component parameters must also be changed accordingly to work stably, increasing the use of the product or increasing the product. type.

As shown in Figure 2, the multi-mode dimming control and constant current drive circuit for LED lighting provided by the embodiment of the utility model includes a constant current drive power supply module, a dimming decoding module and a constant current drive output module connected to each other.

Specifically, the constant current driving power supply module includes a rectification and filtering module, a PFC correction module, a voltage conversion switch module and a PWM control module connected in sequence. The dimming decoding module includes a dimming decoding unit and a dimming signal interface, the power input terminal of the dimming decoding unit is connected to the output terminal of the voltage conversion switch module, and the signal input terminal of the dimming decoding unit is connected to the dimming signal interface The signal output terminal of the dimming decoding unit is connected to the constant current drive output module.

The rectification and filtering circuit is used for filtering and rectifying the input of commercial power, and outputting direct current for use by each module in the circuit.

The PFC correction module is used to correct the power factor of the direct current output by the rectification filter circuit.

The voltage conversion switch module includes a voltage conversion circuit and a power switch tube connected to each other, and is used to convert the DC output from the rectification and filtering circuit into DC voltages of various amplitudes for use by the dimming decoding unit and the constant current drive output module.

The PWM control module is used to output PWM control signals to the voltage conversion switch module to realize voltage conversion of various amplitudes. The voltage feedback input terminal of the PWM control module is also connected to each output terminal of the voltage conversion switch module for receiving the feedback signal output by the voltage conversion module, so as to adjust the PWM control signal in real time.

In current practical applications, the more common traditional lighting dimming signals such as 0/1-10V dimming signals and DALI dimming signals do not generate PWM dimming signals, so they are constant current power supplies that cannot directly drive LED lighting loads for PWM dimming. light. The dimming decoding module described in the embodiment of the utility model is used to receive traditional dimming signals, decode and re-encode them, and convert them into PWM dimming that is available for the constant current drive output module and is suitable for dimming control of LED lighting fixtures Signal. Wherein, the dimming decoding module is replaceable in the circuit, and different dimming decoding modules can be replaced and used according to the signal conversion requirements of different users and different dimming systems. Different dimming decoding modules can respectively convert and decode a traditional dimming signal. If multiple different dimming decoding modules are designed to work at the same voltage and output PWM dimming signals of the same mode, multiple dimming signals can be realized. The replacement use of the optical decoding module in the circuit of the utility model. Due to the replaceability of the dimming decoding module, the embodiments of the present invention have wide applicability and versatility.

In the embodiment of the present invention, two specific circuits of the dimming decoding module are provided.

Among them, the first dimming decoding module is composed of a DALI dimming decoding unit and a DALI dimming signal interface connection. Specifically, as shown in FIG. 3 , the DALI dimming decoding unit includes a uPD78F0756 chip produced by RENESAS and a bypass circuit connected thereto. In the DALI dimming decoding unit, the DALI dimming signal received by the DALI dimming signal interface passes through the rectifier bridge BD1, then passes through the Zener diode ZD1, resistor R9, optocoupler U3, resistor R7, resistor R8, and resistor R10, and then connects To the fifth pin of the uPD78F0756 chip, the resistor R7 and the resistor R8 are also connected in parallel with the transistor Q2; the fourth pin of the feedback terminal of the uPD78F0756 chip is connected to the rectifier bridge BD1 and the two outputs of the optocoupler U2 through the resistor R5 and the optocoupler U2 in turn A resistor R4, a resistor R6 and a transistor Q1 are also connected between the terminals. The 7th and 8th pins of the uPD78F0756 chip are respectively connected to the external 5V working voltage through the resistor R1 and the resistor R2, and the 9th pin, the 10th pin, the 12th pin and the 27th pin are respectively connected to the external 5V working voltage through the resistor R3, The capacitor C2, the capacitor C3 and the capacitor C1 are grounded afterward, and the 11th pin and the 28th pin are directly grounded. The 16th, 17th, 18th and 19th pins of the uPD78F0756 chip are PWM signal output terminals.

The second dimming decoding module is composed of a 0/1-10V dimming decoding unit and a 0/1-10V dimming signal interface connection. As shown in FIG. 4 , the 0/1-10V dimming decoding unit includes a PIC16F616 chip produced by MICROCHIP Company and a bypass circuit connected thereto. Specifically, the 0/1-10V dimming signal received by the 0/1-10V dimming signal interface is grounded through the capacitor C19 on the one hand, and connected to the ninth pin of the PIC16F616 chip through the resistor R21 on the other hand. On the one hand, the working voltage of +12V is grounded through the capacitor C18, and on the other hand, it is connected to the ninth pin of the PIC16F616 chip through the diode D8, the resistor R22, and the resistor R21 in turn. The ninth pin of the PIC16F616 chip is also grounded through the capacitor C17 and the resistor R20 respectively. The 13th pin of the PIC16F616 chip is directly grounded. The 16th pin of the PIC16F616 chip is connected to the working voltage of 5V, and is grounded through the capacitor C16. The working voltage of 5V is also connected to the 8th pin through the diode D6, the resistor R17 and the resistor R18 are connected between the 8th pin and the 3rd pin, and the 3rd pin is grounded through the resistor R18. On the one hand, the comparison voltage A is connected to the 8th pin of the PIC16F616 chip through the diode 9 and the resistor R16 in sequence, and on the other hand, it is also connected to the 4th pin through the transistor Q3 and the resistor R19 in sequence, between the base and the emitter of the transistor Q3 A capacitor C20 is also connected, and the fourth pin is the PWM signal output terminal of the PIC16F616 chip.

The above two dimming decoding modules can be flexibly replaced according to the actual situation. The signal output terminal of the dimming decoding unit outputs the converted PWM signal to the constant current drive output module. As a reservation, the dimming decoding module also includes a PWM dimming signal interface, the PWM dimming signal interface is directly connected to the constant current drive output module, used to directly receive the PWM dimming signal, and through the constant current drive output module Dimming LED lighting loads.

Specifically, the constant current drive output module includes a constant current control module and a current detection module, the signal input terminal of the constant current control module is connected to the signal output terminal of the dimming decoding unit, and the output terminal of the constant current control module is connected to the current detection module The signal input terminal is connected, and the output terminal of the current detection module is connected with the external LED lighting load. The current detection module is also connected to the current feedback terminal of the constant current control module for detecting the current output by the constant current control module and feeding back to the constant current control module to keep the current value output by the constant current control module constant.

The power input end of the constant current control module is connected to the output end of the voltage conversion switch module, and the power input end of the current detection module is also connected to the output end of the voltage conversion switch module.

In the embodiment of the present invention, the voltage conversion switch module outputs 5.1V and 12V operating voltages to the dimming decoding module and the constant current control module respectively, and at the same time, the 12V operating voltage is also delivered to the dimming decoding module in the dimming decoding module. unit as a reference voltage. The voltage conversion switch module outputs a voltage of 32V~57V to the current detection module, so as to adapt to different power consumption requirements of LED lighting loads.

The multi-mode dimming control and constant current drive circuit for LED lighting provided by the utility model not only solves the problem that the traditional lighting dimming signal cannot be directly used for LED lighting dimming, but also can be adjusted according to different users and different lighting conditions. The signal conversion requirements of the system, replace and use different dimming decoding modules. By converting traditional lighting dimming signals into PWM dimming signals available to LED drive circuits, it is possible to replace traditional lighting loads with dimming functions with LED lighting loads without changing the wiring of the existing power supply and dimming systems . At the same time, the constant current drive output module can not only realize PWM dimming, but also set the corresponding constant current value according to the size of the LED lighting load, which is more extensive, convenient and flexible than other LED constant current power supplies with built-in dimming units. Realize mass production and save unnecessary manufacturing costs.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (10)

1. one kind is used for multi-mode brightness adjustment control and the constant-current drive circuit that LED throws light on, it is characterized in that, comprise that interconnective constant-current driving power supply module, light modulation decoder module and constant current drive output module, described constant-current driving power supply module comprises rectification filtering module, PFC correction module, voltage change-over switch module and the PWM control module that connects successively; Described light modulation decoder module comprises light modulation decoding unit and dim signal interface, the power input of described light modulation decoding unit is connected with the output of voltage change-over switch module, the signal input part of light modulation decoding unit is connected with the dim signal interface, and the signal output part of light modulation decoding unit drives output module with constant current and is connected.

2. multi-mode brightness adjustment control and constant-current drive circuit for LED illumination according to claim 1, it is characterized in that, described constant current drives output module and comprises constant current control module and current detection module, the power input of described constant current control module and current detection module is connected with the output of voltage change-over switch module respectively, the signal input part of constant current control module is connected with the signal output part of light modulation decoding unit, the output of constant current control module is connected with the signal input part of current detection module, and the output of current detection module is connected with the external LED lighting load.

3. multi-mode brightness adjustment control and constant-current drive circuit for the LED illumination according to claim 2 is characterized in that current detection module also is connected with the current feedback terminal of constant current control module.

4. multi-mode brightness adjustment control and constant-current drive circuit for the LED illumination according to claim 2 is characterized in that described light modulation decoding unit is 0/1-10V light modulation decoding unit, and described dim signal interface is 0/1-10V dim signal interface.

5. multi-mode brightness adjustment control and constant-current drive circuit for the LED illumination according to claim 2 is characterized in that described light modulation decoding unit is DALI light modulation decoding unit, and described dim signal interface is DALI dim signal interface.

6. according to claim 4 or 5 described multi-mode brightness adjustment control and constant-current drive circuits for the LED illumination, it is characterized in that, described light modulation decoder module also comprises PWM dim signal interface, and described PWM dim signal interface is connected with the signal input part of constant current control module.

7. multi-mode brightness adjustment control and constant-current drive circuit for the LED illumination according to claim 4 is characterized in that, described 0/1-10V light modulation decoding unit comprises the PIC16F616 chip and the bypass circuit that is connected thereon that MICROCHIP company produces.

8. multi-mode brightness adjustment control and constant-current drive circuit for the LED illumination according to claim 5 is characterized in that, described DALI light modulation decoding unit comprises the uPD78F0756 chip and the bypass circuit that is connected thereon that RENESAS company produces.

9. multi-mode brightness adjustment control and constant-current drive circuit for the LED illumination according to claim 1 and 2 is characterized in that each output of described voltage change-over switch module also is connected with the voltage feedback input end of PWM control module.

10. multi-mode brightness adjustment control and constant-current drive circuit for the LED illumination according to claim 2 is characterized in that described current detection module is connected with the 32V ~ 57V voltage output end of voltage change-over switch module; The constant current control module is connected with the 12V voltage output end of voltage change-over switch module; The light modulation decoding unit is connected with the 5.1V voltage output end of voltage change-over switch module, also is connected with the 12V voltage output end.

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