CN103079313B - For multi-mode light modulation and the multichannel independence constant-current drive circuit of LED illumination - Google Patents
For multi-mode light modulation and the multichannel independence constant-current drive circuit of LED illumination Download PDFInfo
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Abstract
The present invention relates to a kind of multi-mode light modulation for LED illumination and multichannel independence constant-current drive circuit, 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 connected successively, PFC correction module, voltage change-over switch module and PWM control module, also comprise multiple light modulation decoding unit, 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 a dim signal interface respectively, the signal output part of each light modulation decoding unit respectively with all constant current driver output model calling.The present invention not only solves the difficult problem that traditional lighting dim signal can not be directly used in the light modulation of LED illumination, and the multiple dim signal interface wherein arranged and light modulation decoding unit can adapt to the signal conversion requirements of different user, different light adjusting system.<pb pnum="1" />
Description
Technical field
The present invention relates to LED illumination control field, particularly relate to a kind of multi-mode light modulation for LED illumination and multichannel independence constant-current drive circuit.
Background technology
LED illumination is the third generation light source that the whole world is generally acknowledged in recent years, LED illumination 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, LED illumination product is more and more by the numerous common people are familiar with.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 started to promote energy-conserving product on a large scale, eliminate the product of low usefulness.
Because LED belongs to a kind of light-emitting diode, by the various combination adopting the quantity of different LED easily to realize its watt level, shape and function, be thus widely used, in like manner, also easily realize electric function and control its brightness and change.But, LED illumination needs the driver being different from flourescent ballast, as constant-current type Switching Power Supply provides a constant operating current to LED, current overload can be avoided to cause the infringement of LED chip, also can avoid the situation of color temperature shift under different current work, therefore LED illumination adopts constant-current type Switching Power Supply generally to accept for industry.Meanwhile, PWM(pulse-width modulation) light regulating technology is also known as most suitable light-dimming method by LED illumination industry.
But the LED illumination that constant-current type Switching Power Supply drives also cannot directly adopt existing light adjusting system to realize dimming function.Traditional lighting light adjusting system, as 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 a part for IEC60929 standard for illumination component, has also been widely used in existing Lighting Control Assembly.But, in traditional lighting, widely used 0/1-10V light adjusting system only provides linear analogue dim signal, cannot directly export PWM dim signal, and the PWM dim signal that DALI digital dimming technology adopts is also different with the PWM dim signal required for LED illumination.If partly or entirely substitute conventional lamp by LED illumination lamp, just need the existing electric wiring of extensive change.Existing light regulating technology and LED brightness adjustment control scheme incompatible, causes the popularization of LED illumination to be subject to numerous obstacles.
Therefore be necessary to develop a kind of conversion equipment traditional dim signal being converted to the discernible PWM dim signal of LED driver, LED illumination lamp under the prerequisite not changing existing electric wiring, can 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, there is disclosed a kind of PWM constant current method and based on the light-dimming method under PWM constant current mode.But, the functional unit that this patent realizes the control of PWM dim signal is connected between constant-current supply output with LED illumination load, PWM dim signal is indirectly determined 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 illumination load, once application requirement changes, namely power supply output and load change, its related circuit design and component parameter also must make corresponding change ability steady operation, add the use restriction of product or add 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 to be separately connected with microprocessor MPU.But this patent merely provides the method that one kind of multiple independent dimming interface concentration connect, and do not disclose the concrete grammar exporting and control.Each module and each interface separately independent be connected to seem with microprocessor MPU simplify product circuit, in fact can identify this MCU simultaneously, to process and the dim signal exporting identical PWM light-modulating mode proposes very high requirement, and internal processes will be correspondingly complicated, adds the difficulty of buying, processing, programming, design ap-plication.
Summary of the invention
In view of this, be necessary for the problems referred to above, the multi-mode light modulation for LED illumination providing a kind of versatility, flexibility strong and multichannel independence constant-current drive circuit, to use in the conventional lighting circuit realizing LED illumination lamp to be connected directly between existing various modes, and without the need to changing 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 for LED illumination and multichannel independence constant-current drive circuit, 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 connected successively, PFC correction module, voltage change-over switch module and PWM control module, also comprise multiple light modulation decoding unit, 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 a dim signal interface respectively, the signal output part of each light modulation decoding unit respectively with all constant current driver output model calling.
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 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 is also connected with the output of voltage change-over switch module respectively.
In each constant current driver output module, current detection module is also connected with the current feedback terminal of constant-current control module.
Described light modulation decoding unit at least comprises 0/1-10V light modulation decoding unit and DALI light modulation decoding unit, 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 of MICROCHIP company production and the bypass circuit be connected thereon.
Described DALI light modulation decoding unit comprises the uPD78F0756 chip of RENESAS company production and the bypass circuit be connected thereon.
Described voltage change-over switch module comprises interconnective voltage conversion circuit and power switch pipe.
Each output of described voltage change-over switch module is also connected with the Voltage Feedback input of PWM control module.
Each current detection module is connected with 32V ~ 57V voltage output end of voltage change-over switch module 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, is also connected with 12V voltage output end.
Multi-mode light modulation for LED illumination provided by the invention and multichannel independence constant-current drive circuit, not only solve the difficult problem that traditional lighting dim signal can not be directly used in the light modulation of LED illumination, and the multiple dim signal interface wherein arranged and light modulation decoding unit can adapt to the signal conversion requirements of different user, different light adjusting system.By traditional lighting dim signal is converted to LED drive circuit can PWM dim signal, can realize do not change existing power supply and light adjusting system wiring prerequisite under, by band dimming function traditional lighting load replace to LED illumination load.Simultaneously, separate multiple constant current output driver modules both can realize synchronous light modulation, be not subject to again the size of other output modules and LED illumination load, the impact of quality, the LED constant current power supply scope of application of dimming unit more built-in than other more extensively, conveniently, flexibly, can realize producing in enormous quantities, save unnecessary manufacturing cost.
Accompanying drawing explanation
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 present invention.
Fig. 3 is the circuit diagram of the first light modulation decoding unit in the embodiment of the present invention.
Fig. 4 is the circuit diagram of the second light modulation decoding unit in the embodiment of the present 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.Its functional unit realizing the control of PWM dim signal is connected to constant-current supply and exports between LED illumination load, PWM dim signal is indirectly determined 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 illumination load, once application requirement changes, namely power supply output and load change, its related circuit design and component parameter also must make corresponding change ability steady operation, add the use restriction of product, add the kind of product.
As shown in Figure 2, the multi-mode light modulation for LED illumination that the embodiment of the present invention provides and multichannel independence constant-current drive circuit 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 the rectification filtering module, PFC correction module, voltage change-over switch module and the PWM control module that connect successively, also comprise multiple light modulation decoding unit, 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 a dim signal interface respectively, the signal output part of each light modulation decoding unit respectively with all constant current driver output model calling.
Described current rectifying and wave filtering circuit is used for carrying out filtering, rectification to civil power input, and each module exported in powered by direct current road uses.
The galvanic power factor that PFC correction module exports for correcting current rectifying and wave filtering circuit.
Voltage change-over switch module comprises interconnective voltage conversion circuit and power switch pipe, and the direct voltage that the direct current for being exported by current rectifying and wave filtering circuit is converted to various amplitude is supplied to light modulation decoding unit and the use of constant current driver output module.
Described PWM control module is used for exporting pwm control signal to voltage change-over switch module, realizes the voltage transitions of various amplitude.The Voltage Feedback input of described PWM control module is also connected with each output of voltage change-over switch module, for the feedback signal that receiver voltage modular converter exports, is convenient to adjust pwm control signal in real time.
In current practical application, what comparatively general traditional lighting dim signal produced as 0/1-10V dim signal and DALI dim signal is not PWM dim signal, is therefore the constant-current supply of Direct driver LED illumination load to carry out PWM light modulation.Multiple light modulation decoding units described in the embodiment of the present invention are used for the dim signal interface traditional lighting dim signal from correspondence, decoding recompile, be converted into constant current driver output module can, be applicable to the PWM dim signal of LED illumination lamp 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 all export the PWM dim signal of same pattern.Owing to having multiple light modulation decoding unit, the constant-current driving power supply module of the embodiment of the present invention can be decoded to multiple traditional lighting dim signal, add 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, for receiving DALI dim signal and being converted to available PWM dim signal; 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, for receiving 0/1-10V dim signal and being converted to available PWM dim signal.According to the demand that reality uses, the light modulation decoding unit of other traditional lighting dim signals of decodable code also can be increased in constant-current driving power supply module.
Particularly, as shown in Figure 3, described first light modulation decoding unit comprises the uPD78F0756 chip of RENESAS company production and the bypass circuit be connected thereon.In the first light modulation decoding unit, the DALI dim signal that first dim signal interface arrives is after rectifier bridge BD1, after voltage stabilizing didoe ZD1, resistance R9, optocoupler U3, resistance R7, resistance R8, resistance R10, be connected to the 5th pin of uPD78F0756 chip successively, resistance R7 and resistance R8 is also in parallel with triode Q2; Feedback end the 4th pin of uPD78F0756 chip, successively through resistance R5 and optocoupler U2, is connected to rectifier bridge BD1, is also connected with resistance R4, resistance R6 and triode Q1 between two outputs of optocoupler U2.7th pin of uPD78F0756 chip is connected external 5V operating voltage respectively through resistance R1 with resistance R2 with the 8th pin, 9th pin, the 10th pin, the 12nd pin and the 27th pin respectively through ground connection after resistance R3, electric capacity C2, electric capacity C3 and electric capacity C1, the 11st pin and the direct ground connection of the 28th pin.16th pin of uPD78F0756 chip, the 17th pin, the 18th pin and the 19th pin are pwm signal output.
As shown in Figure 4, described second light modulation decoding unit comprises the PIC16F616 chip of MICROCHIP company production and the bypass circuit be connected thereon.Particularly, the 0/1-10V dim signal that the second dim signal interface arrives, on the one hand by electric capacity C19 ground connection, is connected to the 9th pin of PIC16F616 chip on the other hand through resistance R21.The operating voltage of+12V, on the one hand by electric capacity C18 ground connection, is connected to the 9th pin of PIC16F616 chip on the other hand successively through diode D8, resistance R22, resistance R21.9th pin of PIC16F616 chip is also respectively through electric capacity C17 and resistance R20 ground connection.The direct ground connection of 13rd pin of PIC16F616 chip.16th pin of PIC16F616 chip connects the operating voltage of 5V, and by electric capacity C16 ground connection.The operating voltage of 5V is also connected to the 8th pin through diode D6, is connected with resistance R17 and resistance R18 between the 8th pin and the 3rd pin, and the 3rd pin is through resistance R18 ground connection.Comparative voltage A mono-aspect is connected to the 8th pin of PIC16F616 chip successively through diode 9 and resistance R16, also be connected to the 4th pin through triode Q3 and resistance R19 successively on the other hand, also be connected with electric capacity C20 between the base stage of triode Q3 and emitter, wherein the 4th pin is the pwm signal output of PIC16F616 chip.
The pwm signal exported after conversion is outputted to all constant current driver output modules by the signal output part of the first light modulation decoding unit and the second light modulation decoding unit respectively.As reserved, described constant-current driving power supply module also comprises PWM dim signal interface, described PWM dim signal interface directly with all constant current driver output model calling, for directly receiving PWM dim signal, by constant current driver output module, light modulation is carried out to LED illumination load.
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 external LED lighting load.Current detection module is also connected with the current feedback terminal of constant-current control module, and for detecting the electric current that constant-current control module exports, and feed back to constant-current control module, the current value that constant-current control module is exported keeps 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 is also connected with the output of voltage change-over switch module respectively.
In embodiments of the present invention, voltage change-over switch module exports the operating voltage of 5.1V and 12V respectively to light modulation decoding unit and each constant-current control module, and meanwhile, the operating voltage of 12V is also transported to light modulation decoding unit as the reference voltage.Voltage change-over switch module exports the voltage of 32V ~ 57V, to adapt to the different needs for electricity of various LED illumination load respectively to each current detection module.
The advantage of above-mentioned connected mode is adopted to be, that each can receive PWM dim signal and there is the constant current driver output module of independent constant current function, all can the load of separate connection LED illumination, and each independently constant current driver output module can synchronously receive PWM dim signal, carries out synchronous light modulation to the LED illumination load being connected to its output.In described multiple constant current driver output module, no matter be providing of PWM dim signal, or the supply of operating voltage, be all receive from constant-current driving power supply module in parallel.When there is exception or fault 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 lost efficacy fails to use can not be loaded in other constant current driver output modules, and other constant current driver output modules can continue normal work and can not transship.Simultaneously, the constant current value that each constant current driver output module exports can adjust according to the needs of LED illumination load, within the total output current of constant-current supply and rated value thereof, can the constant current value of each independently constant current driver output module be set as identical, also difference can be distinguished, the occasion simultaneously worked with the LED illumination unit adapting to multiple identical or different power and realize the synchronous light modulation of different LED lighting load.
Relative to aforementioned published Chinese utility model patent ZL201010547782.2, the watt level of the multi-mode light modulation for LED illumination that the embodiment of the present invention provides and multichannel independence constant-current drive circuit and rear end LED illumination load does not have direct correlation.Therefore, even if the output voltage of constant current driver output module and output constant current value need to do corresponding adjustment according to the size of actual loading, each light modulation decoder module also without the need to carrying out any adjustment change, merely provides PWM dim signal, does not associate with the loading condition of rear end.
Relative to aforementioned published Chinese utility model patent ZL201220201992.0, in the multi-mode light modulation for LED illumination that the embodiment of the present invention provides and multichannel independence constant-current drive circuit, 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, circuit structure is relatively simple, and separately decoding chip works alone completely, easy to process, program simple, design ap-plication difficulty is little.
Multi-mode light modulation for LED illumination provided by the invention and multichannel independence constant-current drive circuit, not only solve the difficult problem that traditional lighting dim signal can not be directly used in the light modulation of LED illumination, and the multiple dim signal interface wherein arranged and light modulation decoding unit can adapt to the signal conversion requirements of different user, different light adjusting system.By traditional lighting dim signal is converted to LED drive circuit can PWM dim signal, can realize do not change existing power supply and light adjusting system wiring prerequisite under, by band dimming function traditional lighting load replace to LED illumination load.Simultaneously, separate multiple constant current output driver modules both can realize synchronous light modulation, be not subject to again the size of other output modules and LED illumination load, the impact of quality, the LED constant current power supply scope of application of dimming unit more built-in than other more extensively, conveniently, flexibly, can realize producing in enormous quantities, save unnecessary manufacturing cost.
The above embodiment only have expressed the preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It 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 (8)
1. the multi-mode light modulation for LED illumination and multichannel independence constant-current drive circuit, 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 connected successively, PFC correction module, voltage change-over switch module and PWM control module, also comprise multiple light modulation decoding unit, 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 a dim signal interface respectively, the signal output part of each light modulation decoding unit respectively with all constant current driver output model calling, described multiple light modulation decoding unit is used for the dim signal interface traditional lighting dim signal from correspondence, decoding recompile, illumination dim signals different for correspondence is converted to constant current driver output module can, the PWM dim signal of the same pattern that is applicable to LED illumination lamp brightness adjustment control, 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 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 is also connected with the output of voltage change-over switch module respectively, each current detection module is connected with 32V ~ 57V voltage output end of voltage change-over switch module, 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, is also connected with 12V voltage output end.
2. the multi-mode light modulation for LED illumination according to claim 1 and multichannel independence constant-current drive circuit, is characterized in that, in each constant current driver output module, current detection module is also connected with the current feedback terminal of constant-current control module.
3. the multi-mode light modulation for LED illumination according to claim 1 and multichannel independence constant-current drive circuit, it is characterized in that, described light modulation decoding unit at least comprises 0/1-10V light modulation decoding unit and DALI light modulation decoding unit, 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.
4. the multi-mode light modulation for LED illumination according to claim 3 and multichannel independence constant-current drive circuit, 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.
5. the multi-mode light modulation for LED illumination according to claim 3 and multichannel independence constant-current drive circuit, it is characterized in that, described 0/1-10V light modulation decoding unit comprises the PIC16F616 chip of MICROCHIP company production and the bypass circuit be connected thereon.
6. the multi-mode light modulation for LED illumination according to claim 3 and multichannel independence constant-current drive circuit, is characterized in that, described DALI light modulation decoding unit comprises the uPD78F0756 chip of RENESAS company production and the bypass circuit be connected thereon.
7. the multi-mode light modulation for LED illumination according to claim 1 and multichannel independence constant-current drive circuit, it is characterized in that, described voltage change-over switch module comprises interconnective voltage conversion circuit and power switch pipe.
8. the multi-mode light modulation for LED illumination according to claim 1 and multichannel independence constant-current drive circuit, is characterized in that, each output of described voltage change-over switch module is also connected with the Voltage Feedback input of PWM control module.
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| CN102691938A (en) * | 2012-05-31 | 2012-09-26 | 深圳市凯铭电气照明有限公司 | Dimmable linear LED projection lamp |
| CN203151798U (en) * | 2012-12-28 | 2013-08-21 | 广州市雷格斯光电科技有限公司 | Multi-mode light modulation and multi-path independent constant-current drive circuit for LED illumination |
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| CN106102221A (en) * | 2016-06-16 | 2016-11-09 | 厦门印天电子科技有限公司 | A kind of LED light adjusting circuit |
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