CN103079313A - Multimode dimming and multipath independent constant-current driving circuit for LED (light emitting diode) illumination - Google Patents
Multimode dimming and multipath independent constant-current driving circuit for LED (light emitting diode) illumination Download PDFInfo
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Abstract
The invention relates to a multimode dimming and multipath independent constant-current driving circuit for LED (light emitting diode) illumination. The circuit comprises a constant-current driving power source module and at least two constant-current driving output modules, wherein the constant-current driving power source module is connected with the constant-current driving output modules, the constant-current driving power source module comprises a rectifying and filtering module, a PFC (power factor correction) module, a voltage conversion switch module, a PWM (pulse width modulation) control module and a plurality of dimming decoding units, the rectifying and filtering module, the PFC module, the voltage conversion switch module and the PWM control module are sequentially connected, the power source input end of each dimming decoding unit is respectively connected with the output end of the voltage conversion switch module, the signal inlet end of each dimming decoding unit is respectively connected with a dimming signal interface, and the signal output end of each dimming decoding unit is respectively connected with the constant-current driving output module. The circuit has the advantages that the problem that the traditional illumination dimming signal cannot be directly used for the dimming of the LED illumination is solved; and the dimming signal interfaces and the dimming decoding units are suitable for the signal conversion requirements of different users and different dimming systems.
Description
Technical field
The present invention relates to LED illumination control field, relate in particular to a kind of multi-mode light modulation and multichannel independence constant-current drive circuit for the LED illumination.
Background technology
LED illumination is the whole world third generation light source of generally acknowledging in recent years, the LED illuminating product is paid close attention to gradually widely with its energy-saving and environmental protection, long-life characteristic, no matter throw light on from outdoor advertisement lighting, landscape light in city or interior decoration, the LED illuminating product is familiar with by the numerous common people more and more.The extensive use of LED illumination has also adapted to the requirement of government's energy-saving and emission-reduction.At present, national governments are all actively eliminating low usefulness illuminating product, and European Union has completely forbidden import or production conventional incandescent, and China has also begun to promote on a large scale energy-conserving product, eliminates the product of low usefulness.
Because LED belongs to a kind of light-emitting diode, easily realize the various combination of its watt level, shape and function by the quantity that adopts different LED, thereby be widely used, in like manner, realize easily that also electric function controls its brightness and variation.Yet, the LED illumination need to be different from the driver of flourescent ballast, provide a constant operating current such as the constant-current type Switching Power Supply to LED, can avoid current overload to cause the infringement of led chip, also can avoid the situation of colour temperature drift under the different current works, so the LED illumination adopts the constant-current type Switching Power Supply generally to accept for industry.Simultaneously, PWM(pulse-width modulation) light regulating technology also is known as only light-dimming method by the LED illuminating industry.
Yet the LED illumination that the constant-current type Switching Power Supply drives also can't directly adopt existing light adjusting system to realize dimming function.The traditional lighting light adjusting system such as the 0/1-10V linearity light adjusting system, provides a 1-10V linear analogue dim signal, has been widely used in traditional light adjusting system.DALI digital dimming technology is the abbreviation of digital addressable lighting interface (Digital Addressable Lighting Interface).DALI provides rule of communication as the part of IEC60929 standard for illumination component, also has been widely used in the existing Lighting Control Assembly.But, widely used 0/1-10V light adjusting system only provides the linear analogue dim signal in the traditional lighting, can't directly export the PWM dim signal, and the PWM dim signal that DALI digital dimming technology adopts is also different with the LED needed PWM dim signal that throws light on.If partly or entirely substitute conventional lamp with the LED lighting, just need the extensive existing electric wiring that changes.Have the incompatible of light regulating technology and LED brightness adjustment control scheme now, cause the popularization of LED illumination to be subject to numerous obstacles.
Therefore be necessary to develop a kind of conversion equipment that traditional dim signal is converted to the discernible PWM dim signal of led driver, make the LED lighting can be under the prerequisite that not change existing electric wiring, be more widely used and promote.
Chinese utility model patent ZL201010547782.2 discloses the LED constant-current control device under a kind of PWM constant current mode, and it has disclosed a kind of PWM constant current method and has reached based on the light-dimming method under the PWM constant current mode.Yet, this patent realizes that the functional unit of PWM dim signal control is connected between constant-current supply output and the LED lighting load, indirectly determine the PWM dim signal by light-sensitive device and current sample, the realization of its PWM light modulation is associated with the size of constant-current supply and LED lighting load, in case application requirements changes, be that power supply output and load change, its interlock circuit design and component parameter also must be made corresponding variation ability steady operation, and the use that has increased product limits or increased the kind of product.
Chinese utility model patent ZL201220201992.0 discloses a kind of universal communication light adjusting circuit, include microprocessor MPU, load current voltage measurement module, temperature-measuring module, also include RS485 communication interface, DALI communication interface, 0～10V to stationary interface, 0～5V dimming interface, PWM dimming interface and fault control circuit module, each module and each interface are independent separately to be connected with microprocessor MPU.Yet, the method that this patent only provides one kind of multiple independent dimming interface concentration to connect, and do not disclose the concrete grammar of output control.Each module and each interface independently are connected to seem with microprocessor MPU has separately simplified product circuit, can the dim signal that in fact identify simultaneously, process and export identical PWM light-modulating mode to this MCU have proposed very high requirement, and internal processes will be correspondingly complicated, increased the difficulty that buying, processing, programming, design are used.
Summary of the invention
In view of this, be necessary for the problems referred to above, a kind of versatility, the strong multi-mode light modulation and the multichannel independence constant-current drive circuit that are used for the LED illumination of flexibility are provided, use to realize the LED lighting directly is connected in the traditional lighting circuit of existing various modes, and need not to change existing power supply and light adjusting system wiring.
For achieving the above object, the utility model by the following technical solutions:
A kind of multi-mode light modulation and multichannel independence constant-current drive circuit for the LED illumination, comprise an interconnective constant-current driving power supply module and at least two constant current driver output modules, described constant-current driving power supply module comprises the rectification filtering module that connects successively, the PFC correction module, voltage change-over switch module and PWM control module, also comprise a plurality of light modulation decoding units, the power input of each light modulation decoding unit is connected with the output of voltage change-over switch module respectively, the signal input part of each light modulation decoding unit connects respectively a dim signal interface, and the signal output part of each light modulation decoding unit is connected with all constant current driver output modules respectively.
Described constant current driver output module comprises constant-current control module and current detection module, the signal input part of constant-current control module is connected with the signal output part of each 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; The power input of the constant-current control module of each constant current driver output module is connected with the output of voltage change-over switch module respectively, and the power input of the current detection module of each constant current driver output module also is connected with the output of voltage change-over switch module respectively.
In each constant current driver output module, current detection module also is connected with the current feedback terminal of constant-current control module.
Described light modulation decoding unit comprises 0/1-10V light modulation decoding unit and DALI light modulation decoding unit at least, the signal input part of described 0/1-10V light modulation decoding unit is connected with 0/1-10V dim signal interface, and the signal input part of described DALI light modulation decoding unit is connected with DALI dim signal interface.
Described constant-current driving power supply module also comprises PWM dim signal interface, and described PWM dim signal interface is connected with the signal input part of each constant-current control module.
Described 0/1-10V light modulation decoding unit comprises the PIC16F616 chip and the bypass circuit that is connected thereon that MICROCHIP company produces.
Described DALI light modulation decoding unit comprises the uPD78F0756 chip and the bypass circuit that is connected thereon that RENESAS company produces.
Described voltage change-over switch module comprises interconnective voltage conversion circuit and power switch pipe.
Each output of described voltage change-over switch module also is connected with the Voltage Feedback input of PWM control module.
Each current detection module is connected with the 32V of voltage change-over switch module ~ 57V voltage output end respectively; Each constant-current control module is connected with the 12V voltage output end of voltage change-over switch module respectively; Each 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.
Multi-mode light modulation and multichannel independence constant-current drive circuit for the LED illumination provided by the invention, not only solved the difficult problem that the traditional lighting dim signal can not be directly used in the light modulation of LED illumination, and a plurality of dim signal interfaces that wherein arrange and light modulation decoding unit can adapt to the signal conversion requirement of different user, different light adjusting systems.By the traditional lighting dim signal being converted to the PWM dim signal that led drive circuit can be used, can realize under the prerequisite that does not change existing power supply and light adjusting system wiring, the traditional lighting load with dimming function being replaced to the LED lighting load.Simultaneously, separate a plurality of constant current output driver modules both can be realized synchronous light modulation, be not subjected to again the size of other output modules and LED lighting load, the impact of quality, the LED constant-current supply scope of application than other built-in light modulation unit is more extensive, convenient, flexible, can realize producing in enormous quantities, save unnecessary manufacturing cost.
Description of drawings
Fig. 1 is the structured flowchart of the LED constant-current control device under a kind of PWM constant current mode of the prior art.
Fig. 2 is the structural representation of the embodiment of the invention.
Fig. 3 is the circuit diagram of the first light modulation decoding unit in the embodiment of the invention.
Fig. 4 is the circuit diagram of the second light modulation decoding unit in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment content of the present utility model is described in detail.
As shown in Figure 1, be the structured flowchart of the LED constant-current control device under published a kind of PWM constant current mode.It realizes that the functional unit of PWM dim signal control is connected between constant-current supply output and the LED lighting load, indirectly determine the PWM dim signal by light-sensitive device and current sample, the realization of its PWM light modulation is associated with the size of constant-current supply and LED lighting load, in case application requirements changes, be that power supply output and load change, its interlock circuit design and component parameter also must be made corresponding variation ability steady operation, increase the use restriction of product, increased the kind of product.
As shown in Figure 2, the multi-mode light modulation and the multichannel independence constant-current drive circuit that are used for the LED illumination that the embodiment of the invention provides comprise an interconnective constant-current driving power supply module and at least two constant current driver output modules, in embodiments of the present invention, described constant current driver output module has four.
Particularly, 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, also comprise a plurality of light modulation decoding units, the power input of each light modulation decoding unit is connected with the output of voltage change-over switch module respectively, the signal input part of each light modulation decoding unit connects respectively a dim signal interface, and the signal output part of each light modulation decoding unit is connected with all constant current driver output modules respectively.
Described current rectifying and wave filtering circuit is used for civil power input is carried out filtering, rectification, and output DC is for each module in the circuit.
The PFC correction module is used for proofreading and correct the galvanic power factor of current rectifying and wave filtering circuit output.
The voltage change-over switch module comprises interconnective voltage conversion circuit and power switch pipe, and the direct voltage that is converted to various amplitudes for the direct current with current rectifying and wave filtering circuit output offers light modulation decoding unit and the use of constant current driver output module.
Described PWM control module is used for realizing the voltage transitions of various amplitudes to voltage change-over switch module output pwm control signal.The Voltage Feedback input of described PWM control module also is connected with each output of voltage change-over switch module, is used for the feedback signal of receiver voltage modular converter output, is convenient to adjust in real time pwm control signal.
In the at present practical application, what comparatively general traditional lighting dim signal such as 0/1-10V dim signal and DALI dim signal produced is not the PWM dim signal, therefore is that the constant-current supply of directly driving LED lighting load carries out the PWM light modulation.The described a plurality of light modulation decoding units of the embodiment of the invention are used for receiving the traditional lighting dim signal from the dim signal interface of correspondence, decoding and recompile, be converted into that constant current driver output module can use, be applicable to the PWM dim signal of LED lighting brightness adjustment control.Wherein, each light modulation decoding unit is used for a kind of conversion and decoding of traditional dim signal, and all light modulation decoding units are all exported the PWM dim signal of same pattern.Owing to having a plurality of light modulation decoding units, so that the constant-current driving power supply module of the embodiment of the invention can be decoded to multiple traditional lighting dim signal, having increased applicability of the present invention and versatility.
In embodiments of the present invention, described light modulation decoding unit comprises the first light modulation decoding unit and the second light modulation decoding unit.Wherein, the first light modulation decoding unit is DALI light modulation decoding unit, and the signal input part of the first light modulation decoding unit is connected with the first dim signal interface, is used for receiving the DALI dim signal and being converted to available PWM dim signal; The second light modulation decoding unit is 0/1-10V light modulation decoding unit, and the signal input part of the second light modulation decoding unit is connected with the second dim signal interface, is used for receiving the 0/1-10V dim signal and being converted to available PWM dim signal.According to the demand that reality is used, also can in the constant-current driving power supply module, increase the light modulation decoding unit of other traditional lighting dim signals of decodable code.
Particularly, as shown in Figure 3, described the first light modulation decoding unit comprises the uPD78F0756 chip and the bypass circuit that is connected thereon that RENESAS company produces.In the first light modulation decoding unit, behind the DALI dim signal process rectifier bridge BD1 that the first dim signal interface receives, through being connected to the 5th pin of uPD78F0756 chip after voltage stabilizing didoe ZD1, resistance R 9, optocoupler U3, resistance R 7, resistance R 8, the resistance R 10, resistance R 7 and resistance R 8 are also in parallel with triode Q2 successively; Feedback end the 4th pin of uPD78F0756 chip passes through resistance R 5 and optocoupler U2 successively, is connected to rectifier bridge BD1, also is connected with resistance R 4, resistance R 6 and triode Q1 between two outputs of optocoupler U2.The 7th pin of uPD78F0756 chip and the 8th pin are connected with resistance R through resistance R 1 respectively and are connected external 5V operating voltage, the 9th pin, the 10th pin, the 12nd pin and the 27th pin pass through respectively ground connection, the 11st pin and the direct ground connection of the 28th pin after resistance R 3, capacitor C 2, capacitor C 3 and the capacitor C 1.The 16th pin of uPD78F0756 chip, the 17th pin, the 18th pin and the 19th pin are the pwm signal output.
As shown in Figure 4, described the second light modulation decoding unit comprises the PIC16F616 chip and the bypass circuit that is connected thereon that MICROCHIP company produces.Particularly, the 0/1-10V dim signal that the second dim signal interface receives is connected to the 9th pin of PIC16F616 chip on the other hand on the one hand by capacitor C 19 ground connection through resistance R 21.The operating voltage of+12V is connected to the 9th pin of PIC16F616 chip on the other hand successively on the one hand by capacitor C 18 ground connection through diode D8, resistance R 22, resistance R 21.The 9th pin of PIC16F616 chip also passes through respectively capacitor C 17 and resistance R 20 ground connection.The direct ground connection of the 13rd pin of PIC16F616 chip.The 16th pin of PIC16F616 chip connects the operating voltage of 5V, and by capacitor C 16 ground connection.The operating voltage of 5V also is connected to the 8th pin through diode D6, is connected with resistance R 17 and resistance R 18, the 3 pins between the 8th pin and the 3rd pin through resistance R 18 ground connection.Comparative voltage A passes through the 8th pin that diode 9 and resistance R 16 are connected to the PIC16F616 chip on the one hand successively, also be connected to the 4th pin through triode Q3 and resistance R 19 successively on the other hand, also be connected with capacitor C 20 between the base stage of triode Q3 and the emitter, wherein the 4th pin is the pwm signal output of PIC16F616 chip.
The pwm signal of output outputed to respectively all constant current driver output modules after the signal output part of the first light modulation decoding unit and the second light modulation decoding unit will be changed.As reservation, described constant-current driving power supply module also comprises PWM dim signal interface, described PWM dim signal interface directly is connected with all constant current driver output modules, is used for directly receiving the PWM dim signal, by constant current driver output module the LED lighting load is carried out light modulation.
Concrete, each constant current driver output module comprises constant-current control module and current detection module, the signal input part of constant-current control module is connected with the signal output part of each 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.Current detection module also is connected with the current feedback terminal of constant-current control module, for detection of the electric current of constant-current control module output, and feeds back to constant-current control module, makes the current value of constant-current control module output keep constant.
In embodiments of the present invention, the power input of the constant-current control module of each constant current driver output module is connected with the output of voltage change-over switch module respectively, and the power input of the current detection module of each constant current driver output module also is connected with the output of voltage change-over switch module respectively.
In embodiments of the present invention, to the operating voltage of light modulation decoding unit and each constant-current control module output 5.1V and 12V, simultaneously, the operating voltage of 12V also is transported to the light modulation decoding unit as reference voltage to the voltage change-over switch module respectively.The voltage change-over switch module is exported respectively the voltage of 32V ~ 57V to each current detection module, to adapt to the different needs for electricity of various LED lighting loads.
Adopt the advantage of above-mentioned connected mode to be, each can receive the constant current driver output module PWM dim signal and that have independent constant current function, but equal separate connection LED lighting load, and independently constant current driver output module can Synchronous Receiving PWM dim signal for each, and the LED lighting load that is connected in its output is carried out synchronous light modulation.In described a plurality of constant current driver output modules, no matter be providing of PWM dim signal, or the supply of operating voltage, all be to receive from the constant-current driving power supply module in parallel.When unusual or fault appear in certain constant current driver output module; because each module has independent constant-current control circuit and power supply circuit; the electric current that the constant current driver output module that lost efficacy fails to use can not be loaded on other constant current driver output modules, and other constant current driver output modules can continue normal operation and can not transship.Simultaneously, the constant current value of each constant current driver output module output can be adjusted according to the needs of LED lighting load, in the total output current of constant-current supply and rated value thereof, can with each independently the constant current value of constant current driver output module be set as identical, also can distinguish different, the occasion of working simultaneously with the LED lighting unit that adapts to a plurality of identical or different power and the synchronous light modulation that realizes the different LED lighting load.
With respect to aforementioned published Chinese utility model patent ZL201010547782.2, the multi-mode light modulation that is used for the LED illumination that the embodiment of the invention provides and the watt level of multichannel independence constant-current drive circuit and rear end LED lighting load do not have direct correlation.Therefore, even the output voltage of constant current driver output module and output constant current value need to be done corresponding adjustment according to the size of actual loading, each light modulation decoder module also need not to carry out any adjustment to be changed, and has only provided the PWM dim signal, does not have related with the loading condition of rear end.
With respect to aforementioned published Chinese utility model patent ZL201220201992.0, the multi-mode light modulation and the multichannel independence constant-current drive circuit that are used for the LED illumination that the embodiment of the invention provides, different dim signals has corresponding dim signal interface and corresponding light modulation decoding unit, each light modulation decoding unit only need use corresponding treatment circuit to get final product, circuit structure is relatively simple, and decoding chip works alone fully separately, and it is little that easy to process, program is simple, difficulty is used in design.
Multi-mode light modulation and multichannel independence constant-current drive circuit for the LED illumination provided by the invention, not only solved the difficult problem that the traditional lighting dim signal can not be directly used in the light modulation of LED illumination, and a plurality of dim signal interfaces that wherein arrange and light modulation decoding unit can adapt to the signal conversion requirement of different user, different light adjusting systems.By the traditional lighting dim signal being converted to the PWM dim signal that led drive circuit can be used, can realize under the prerequisite that does not change existing power supply and light adjusting system wiring, the traditional lighting load with dimming function being replaced to the LED lighting load.Simultaneously, separate a plurality of constant current output driver modules both can be realized synchronous light modulation, be not subjected to again the size of other output modules and LED lighting load, the impact of quality, the LED constant-current supply scope of application than other built-in light modulation unit is more extensive, convenient, flexible, can realize producing in enormous quantities, save unnecessary manufacturing cost.
The above embodiment has only expressed preferred implementation of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. one kind is used for multi-mode light modulation and the multichannel independence constant-current drive circuit that LED throws light on, it is characterized in that, comprise an interconnective constant-current driving power supply module and at least two constant current driver output modules, described constant-current driving power supply module comprises the rectification filtering module that connects successively, the PFC correction module, voltage change-over switch module and PWM control module, also comprise a plurality of light modulation decoding units, the power input of each light modulation decoding unit is connected with the output of voltage change-over switch module respectively, the signal input part of each light modulation decoding unit connects respectively a dim signal interface, and the signal output part of each light modulation decoding unit is connected with all constant current driver output modules respectively.
2. multi-mode light modulation and multichannel independence constant-current drive circuit for LED illumination according to claim 1, it is characterized in that, described constant current driver output module comprises constant-current control module and current detection module, the signal input part of constant-current control module is connected with the signal output part of each 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; The power input of the constant-current control module of each constant current driver output module is connected with the output of voltage change-over switch module respectively, and the power input of the current detection module of each constant current driver output module also is connected with the output of voltage change-over switch module respectively.
3. multi-mode light modulation and multichannel independence constant-current drive circuit for the LED illumination according to claim 2 is characterized in that, in each constant current driver output module, current detection module also is connected with the current feedback terminal of constant-current control module.
4. multi-mode light modulation and multichannel independence constant-current drive circuit for LED illumination according to claim 2, it is characterized in that, described light modulation decoding unit comprises 0/1-10V light modulation decoding unit and DALI light modulation decoding unit at least, the signal input part of described 0/1-10V light modulation decoding unit is connected with 0/1-10V dim signal interface, and the signal input part of described DALI light modulation decoding unit is connected with DALI dim signal interface.
5. multi-mode light modulation and multichannel independence constant-current drive circuit for LED illumination according to claim 4, it is characterized in that, described constant-current driving power supply module also comprises PWM dim signal interface, and described PWM dim signal interface is connected with the signal input part of each constant-current control module.
6. multi-mode light modulation and multichannel independence constant-current drive circuit for LED illumination according to claim 4, it 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.
7. multi-mode light modulation and multichannel independence constant-current drive circuit for the LED illumination according to claim 4 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.
8. multi-mode light modulation and multichannel independence constant-current drive circuit for the LED illumination according to claim 1 and 2 is characterized in that, described voltage change-over switch module comprises interconnective voltage conversion circuit and power switch pipe.
9. multi-mode light modulation and multichannel independence 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 of PWM control module.
10. multi-mode light modulation and multichannel independence constant-current drive circuit for LED illumination according to claim 2 is characterized in that, the 32V of each current detection module and voltage change-over switch module ~ 57V voltage output end is connected; Each constant-current control module is connected with the 12V voltage output end of voltage change-over switch module; Each 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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| CN114466478A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | Method for accelerating LED power supply development through integration |
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