CN104470149A - Dimming circuit suitable for multiple dimming modes - Google Patents
Dimming circuit suitable for multiple dimming modes Download PDFInfo
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- CN104470149A CN104470149A CN201410818755.2A CN201410818755A CN104470149A CN 104470149 A CN104470149 A CN 104470149A CN 201410818755 A CN201410818755 A CN 201410818755A CN 104470149 A CN104470149 A CN 104470149A
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Abstract
The invention relates to the technical field of dimming, in particular to a dimming circuit suitable for multiple dimming modes. According to the dimming circuit, on one hand all received dimming signals are converted into PWM signals through a PWM generation module, then a signal conditioning module conditions the PWM signals, and therefore the dimming circuit can be suitable for light modulators of different types; on the other hand, the signal conditioning module of the dimming circuit obtains the voltage of the base B of an LED drive circuit and outputs drive signals when the PWM signals float according to the voltage of the base B of the LED drive circuit, and therefore even if the PWM signal receiving end floats because of work of the light modulators or the dimming circuit, the signal conditioning module still can output the drive signals to drive the LED drive circuit when detecting that the voltage of the base B is not zero (the LED drive circuit works normally), and the LED drive circuit is prevented from stopping outputting the drive signals.
Description
Technical field
The present invention relates to light regulating technology field, particularly the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation.
Background technology
Along with the development of semiconductor technology and LED illumination technology, LED illumination lamp has the advantage such as energy-saving and environmental protection and life-span length, increasing illumination occasion adopts LED illumination lamp to substitute the light fixtures such as traditional incandescent lamp and realizes illumination, also includes many occasions needing to carry out light modulation in these illumination occasions.
In current light regulating technology, the scheme of dimmer is generally send dim signal to light adjusting circuit by dimmer, and light adjusting circuit sends drive singal to LED drive circuit according to dim signal, controls the output of LED drive circuit with this.But, the huge number of current dimmer, point can be divided into wired from connected mode with distance type dimmer, resistance-type light modulation can be divided into from dimming mode point, the various ways such as voltage-type light modulation and PWM light modulation, therefore, the signal kinds of the dim signal that light adjusting circuit receives is diversified, it may be a resistance signal, also may be a linear voltage, it is likely also a pwm signal, and for different signals, its modulate circuit needed is distinguished to some extent, therefore light adjusting circuit needs are caused to change according to the selection of dimmer, this has inconvenience in commercial Application, there is provided the light adjusting circuit of adaptive multiple light-modulating mode to be very necessary.
On the other hand, current light adjusting circuit is in order to the multiple dimmer of adaptation, its structure becomes increasingly complex, usually there is MCU module, and the possibility of MCU module fault is larger, and dimmer in use unavoidably exists the possibility of fault, such as resistive dimmers just exists more open circuit may.In prior art, the extinguishing of normal LED etc. has the shutoff of LED drive circuit to realize, LED drive circuit can produce multiple base stage B(such as 2.5V providing reference voltage after powered up, 5V, 12V), and the effect of dimmer and light adjusting circuit is only the size regulating brightness, but the output of the driving voltage of LED drive circuit depends on the output of light adjusting circuit, when dimmer or light adjusting circuit break down and cause no-output, LED drive circuit can quit work and extinguish LED, that is LED can extinguish suddenly due to the fault of dimmer in course of normal operation, affect the normal work of LED.
Summary of the invention
The object of the invention is to avoid above-mentioned weak point of the prior art and a kind of light adjusting circuit that simultaneously can mate multiple light-modulating mode is provided, this light adjusting circuit can also keep when dimmer or light adjusting circuit fault exporting, thus the LED avoiding LED drive circuit to quit work and cause extinguishes suddenly.
Object of the present invention is achieved through the following technical solutions:
Provide the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation, comprise PWM generation module and Signal-regulated kinase, described PWM generation module generates pwm signal according to the dim signal sent by dimmer received, described pwm signal is sent to the pwm signal receiving terminal of described Signal-regulated kinase by described PWM generation module, described Signal-regulated kinase according to the pwm signal output drive signal received to LED drive circuit, described Signal-regulated kinase obtain described LED drive circuit base stage B voltage and when pwm signal receiving terminal is unsettled according to the base stage B voltage output drive signal of LED drive circuit.
Wherein, described Signal-regulated kinase comprises filtering follow circuit and anti-unsettled circuit, the described anti-input of unsettled circuit is connected with the base stage B of LED drive circuit, the output of described anti-unsettled circuit and the input of filtering follow circuit, pwm signal receiving terminal three end are connected to a contact altogether altogether, pwm signal receiving terminal non-unsettled time this common contact magnitude of voltage follow pwm signal receiving terminal, when pwm signal receiving terminal is unsettled, the magnitude of voltage of this common contact follows the output of anti-unsettled circuit.
Wherein, described anti-unsettled circuit comprises the comparison circuit be made up of operational amplifier, the in-phase end of described comparison circuit is connected to the base stage B of LED drive circuit, and the end of oppisite phase of described comparison circuit is connected to power supply ground, and the output of described comparison circuit connects the output of anti-unsettled circuit.
Wherein, the in-phase end of described operational amplifier is connected to the base stage B of described LED drive circuit through resistance R302, the end of oppisite phase of described operational amplifier is connected to power supply ground through resistance R300, the output of described operational amplifier feeds back to its end of oppisite phase through resistance R301 on the one hand, its in-phase end is fed back to, wherein (R304+R303)/R302 >=R301/R300 on the other hand through resistance R304 and resistance R303.
Wherein, described filtering follow circuit comprises filter regulator circuit, voltage follower circuit, described filter regulator circuit exports voltage follower circuit to by after the described altogether signal filtering that contact receives, and described voltage follower circuit output drive signal is to LED drive circuit.
Wherein, described filter regulator circuit comprises voltage stabilizing didoe ZD301, and described voltage stabilizing didoe ZD301 makes the output voltage values of described filter circuit of pressure-stabilizing be less than or equal to first threshold.
Wherein, the output of described voltage follower circuit is provided with rear end filter circuit, and the drive singal that described voltage follower circuit exports is delivered to LED drive circuit after the filter circuit filtering of described rear end.
Wherein, described PWM generation module comprises main control chip, and described main control chip comprises mechanical dimming signal receiving end and Wireless Light modulating signal receiving end, and described mechanical dimming signal receiving end is connected with mechanical dimming signal receiving circuit.
Wherein, described mechanical dimming signal receiving circuit receives the dim signal of resistive dimmers, voltage-type dimmer or PWM formula dimmer output and is converted into linear voltage to be delivered to PWM generation module.
Wherein, described mechanical dimming signal receiving circuit comprises signal receiving end, power supply circuits, front-end filtering circuitry and voltage stabilizing didoe ZD300, described power supply circuits provide reference voltage when signal receiving end access resistive dimmers, the signal that signal receiving end inputs by described front-end filtering circuitry carries out filtering to form linear voltage, and the output that described voltage stabilizing didoe ZD300 is connected to described filter circuit is less than or equal to Second Threshold with the linear voltage making mechanical dimming signal receiving circuit and be delivered to PWM generation module.
Beneficial effect of the present invention: the invention provides a kind of can the light adjusting circuit of the multiple light-modulating mode of Auto-matching, the all dim signals received all are converted into pwm signal through PWM generation module by this light adjusting circuit on the one hand, then by Signal-regulated kinase, pwm signal is nursed one's health, thus this light adjusting circuit can adaptive dissimilar dimmer, on the other hand, the Signal-regulated kinase of this light adjusting circuit obtain described LED drive circuit base stage B voltage and when pwm signal is unsettled according to the base stage B voltage output drive signal of LED drive circuit, even if therefore dimmer or light adjusting circuit work cause pwm signal receiving terminal unsettled, Signal-regulated kinase then can when base stage B voltage non-zero being detected (LED drive circuit normally works) output drive signal driving LED drive circuit, LED drive circuit is avoided to stop output drive signal.
Accompanying drawing explanation
The invention will be further described to utilize accompanying drawing, but the embodiment in accompanying drawing does not form any limitation of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, can also obtain other accompanying drawing according to the following drawings.
Fig. 1 is the circuit block diagram of the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation of the present invention.
Fig. 2 is the circuit diagram of the PWM generation module of the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation of the present invention.
Fig. 3 is the circuit diagram of the Signal-regulated kinase of the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation of the present invention.
Embodiment
The invention will be further described with the following Examples.
Embodiment
The embodiment of the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation of the present invention, as depicted in figs. 1 and 2, comprise: PWM generation module 1 and Signal-regulated kinase 2, PWM generation module 1 generates pwm signal according to the dim signal sent by dimmer received, described pwm signal is sent to the pwm signal receiving terminal of described Signal-regulated kinase 2 by PWM generation module 1, Signal-regulated kinase 2 according to the pwm signal output drive signal received to LED drive circuit.
Concrete, PWM generation module 1 is based on the MCU chip of SH88F2051A type, the dim signal received mainly is converted into pwm signal by it, so that Signal-regulated kinase is effectively nursed one's health signal, this chip comprises mechanical dimming signal receiving end and Wireless Light modulating signal receiving end, described mechanical dimming signal receiving end is connected with mechanical dimming signal receiving circuit 21, Wireless Light modulating signal receiving end connects wireless signal receiving circuit 22 to receive Wireless Light modulating signal, mechanical dimming signal receiving circuit 21 comprises signal receiving end, power supply circuits, front-end filtering circuitry and voltage stabilizing didoe ZD300, described power supply circuits are formed through resistance R311 by 12V voltage, reference voltage is provided when signal receiving end access resistive dimmers, described front-end filtering circuitry is made up of resistance R312 and electric capacity C309, signal for being inputted by signal receiving end carries out filtering to form linear voltage, the output that described voltage stabilizing didoe ZD300 is connected to described filter circuit is less than or equal to Second Threshold with the linear voltage making mechanical dimming signal receiving circuit 21 and be delivered to PWM generation module 1, thus make it possible to receive resistance-type simultaneously, the dim signal that voltage-type or PWM formula dimmer export, and be converted into linear voltage to input to PWM generation module 1, what simultaneously voltage stabilizing didoe ZD300 limited this linear voltage avoids it more than the bearing capacity of PWM generation module 1.Reception of wireless signals module is mainly used in receiving infrared signal such as Wireless Light modulating such as grade, and it inputs to PWM generation module 1 after being transformed by dim signal equally.
Signal-regulated kinase 2 comprises pwm signal receiving terminal, filtering follow circuit and anti-unsettled circuit 31, the anti-output of unsettled circuit 31 and the input of filtering follow circuit, pwm signal receiving terminal three end is connected to a contact altogether altogether, because pwm signal receiving terminal receives the pwm signal of PWM generation module 1 output, and this signal is produced by the MCU chip of SH88F2051A type, therefore, when this MCU chip exists when unsettled (pwm signal receiving terminal non-) when pwm signal exports, the magnitude of voltage of this common contact must be followed in pwm signal receiving terminal, what namely the input of filtering follow circuit received is the pwm signal that MCU chip exports, when MCU chip does not exist (when pwm signal receiving terminal is unsettled) when pwm signal exports, the magnitude of voltage of this common contact must follow the output in anti-unsettled circuit 31, the signal of the output of anti-unsettled circuit 31 that what namely the input of filtering follow circuit received is.Therefore, compared with prior art, when dimmer or light adjusting circuit work cause pwm signal receiving terminal unsettled, anti-unsettled circuit 31 can provide a signal to filtering follow circuit, makes filtering follow circuit still can output drive signal.
Concrete, above-mentioned anti-unsettled circuit 31 comprises operational amplifier, and (in Fig. 2, U4 comprises two operational amplifiers, unsettled circuit is put for one for this, one for voltage follower circuit), the in-phase end of operational amplifier is connected to the base stage B of described LED drive circuit through resistance R302, the end of oppisite phase of described operational amplifier is connected to power supply ground through resistance R300, the output of described operational amplifier feeds back to its end of oppisite phase through resistance R301 on the one hand, its in-phase end is fed back on the other hand through resistance R304 and resistance R303, wherein (R304+R303)/R302=R301/R300, the comparison circuit that namely operational amplifier is formed, the in-phase end of described comparison circuit is connected to the base stage B of LED drive circuit 1, the end of oppisite phase of described comparison circuit is connected to power supply ground, the output of described comparison circuit connects the output namely putting unsettled circuit.Therefore, as long as the base stage B voltage non-zero (namely LED drive circuit 1 is working properly) of LED drive circuit 1, namely this anti-unsettled circuit 31 exports a positive voltage, and (the present embodiment is maximum motivation value by the drive singal that parameter adjustment makes this positive voltage produce, namely lamp is the brightest at this voltage, certainly, concrete those skilled in the art can adjust flexibly).And when the base stage B voltage of LED drive circuit 1 is zero (LED drive circuit 1 quits work), then namely this anti-unsettled circuit 31 exports is zero, can not have any impact to LED drive circuit 1.
Filtering follow circuit comprises filter regulator circuit 32, voltage follower circuit 33 and rear end filter circuit 34, described filter regulator circuit 32 is made up of resistance R305, electric capacity C302 and voltage stabilizing didoe ZD301, it exports voltage follower circuit 33 to by after the described altogether signal filtering that contact receives, voltage stabilizing didoe ZD301 makes the output voltage values of described filter circuit of pressure-stabilizing be less than or equal to first threshold, exceeds the ability to bear of voltage follower circuit 33 or LED drive circuit 1 with the magnitude of voltage avoiding filter regulator circuit 32 to export.Described voltage follower circuit 33 is made up of an operational amplifier of chip U4, and its drive singal exported is delivered to LED drive circuit 1 after filter circuit 34 filtering of described rear end.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although done to explain to the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (10)
1. the light adjusting circuit of the multiple light-modulating mode of adaptation, it is characterized in that: comprise PWM generation module and Signal-regulated kinase, described PWM generation module generates pwm signal according to the dim signal sent by dimmer received, described pwm signal is sent to the pwm signal receiving terminal of described Signal-regulated kinase by described PWM generation module, described Signal-regulated kinase according to the pwm signal output drive signal received to LED drive circuit, described Signal-regulated kinase obtain described LED drive circuit base stage B voltage and when pwm signal receiving terminal is unsettled according to the base stage B voltage output drive signal of LED drive circuit.
2. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 1, it is characterized in that: described Signal-regulated kinase comprises filtering follow circuit and anti-unsettled circuit, the described anti-input of unsettled circuit is connected with the base stage B of LED drive circuit, the described anti-output of unsettled circuit and the input of filtering follow circuit, pwm signal receiving terminal three end is connected to a contact altogether altogether, pwm signal receiving terminal non-unsettled time this common contact magnitude of voltage follow pwm signal receiving terminal, when pwm signal receiving terminal is unsettled, the magnitude of voltage of this common contact follows the output of anti-unsettled circuit.
3. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 1, it is characterized in that: described anti-unsettled circuit comprises the comparison circuit be made up of operational amplifier, the in-phase end of described comparison circuit is connected to the base stage B of LED drive circuit, the end of oppisite phase of described comparison circuit is connected to power supply ground, and the output of described comparison circuit connects the output of anti-unsettled circuit.
4. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 3, it is characterized in that: the in-phase end of described operational amplifier is connected to the base stage B of described LED drive circuit through resistance R302, the end of oppisite phase of described operational amplifier is connected to power supply ground through resistance R300, the output of described operational amplifier feeds back to its end of oppisite phase through resistance R301 on the one hand, its in-phase end is fed back to, wherein (R304+R303)/R302 >=R301/R300 on the other hand through resistance R304 and resistance R303.
5. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 1, it is characterized in that: described filtering follow circuit comprises filter regulator circuit, voltage follower circuit, described filter regulator circuit exports voltage follower circuit to by after the described altogether signal filtering that contact receives, and described voltage follower circuit output drive signal is to LED drive circuit.
6. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 5, it is characterized in that: described filter regulator circuit comprises voltage stabilizing didoe ZD301, described voltage stabilizing didoe ZD301 makes the output voltage values of described filter circuit of pressure-stabilizing be less than or equal to first threshold.
7. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 5, it is characterized in that: the output of described voltage follower circuit is provided with rear end filter circuit, the drive singal that described voltage follower circuit exports is delivered to LED drive circuit after the filter circuit filtering of described rear end.
8. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 1, it is characterized in that: described PWM generation module comprises main control chip, described main control chip comprises mechanical dimming signal receiving end and Wireless Light modulating signal receiving end, and described mechanical dimming signal receiving end is connected with mechanical dimming signal receiving circuit.
9. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 8, is characterized in that: described mechanical dimming signal receiving circuit receives the dim signal of resistive dimmers, voltage-type dimmer or PWM formula dimmer output and is converted into linear voltage to be delivered to PWM generation module.
10. the light adjusting circuit of the multiple light-modulating mode of a kind of adaptation as claimed in claim 8, it is characterized in that: described mechanical dimming signal receiving circuit comprises signal receiving end, power supply circuits, front-end filtering circuitry and voltage stabilizing didoe ZD300, described power supply circuits provide reference voltage when signal receiving end access resistive dimmers, the signal that signal receiving end inputs by described front-end filtering circuitry carries out filtering to form linear voltage, the output that described voltage stabilizing didoe ZD300 is connected to described filter circuit is less than or equal to Second Threshold with the linear voltage making mechanical dimming signal receiving circuit and be delivered to PWM generation module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410818755.2A CN104470149B (en) | 2014-12-25 | 2014-12-25 | Dimming circuit suitable for multiple dimming modes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410818755.2A CN104470149B (en) | 2014-12-25 | 2014-12-25 | Dimming circuit suitable for multiple dimming modes |
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| Publication Number | Publication Date |
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| CN104470149A true CN104470149A (en) | 2015-03-25 |
| CN104470149B CN104470149B (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410818755.2A Expired - Fee Related CN104470149B (en) | 2014-12-25 | 2014-12-25 | Dimming circuit suitable for multiple dimming modes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071986A (en) * | 2017-05-31 | 2017-08-18 | 惠州市西顿工业发展有限公司 | A kind of light adjusting circuit of LED lamp |
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| US20070257861A1 (en) * | 2006-05-05 | 2007-11-08 | Linear Technology Corporation | Circuit and methodology for supplying pulsed current to a load, such as a light emitting diode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107071986A (en) * | 2017-05-31 | 2017-08-18 | 惠州市西顿工业发展有限公司 | A kind of light adjusting circuit of LED lamp |
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| CN104470149B (en) | 2017-04-12 |
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Granted publication date: 20170412 Termination date: 20201225 |