CN104684155A - LED (light emitting diode) driving power supply dimming circuit and lamp - Google Patents
LED (light emitting diode) driving power supply dimming circuit and lamp Download PDFInfo
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- CN104684155A CN104684155A CN201310627313.5A CN201310627313A CN104684155A CN 104684155 A CN104684155 A CN 104684155A CN 201310627313 A CN201310627313 A CN 201310627313A CN 104684155 A CN104684155 A CN 104684155A
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Abstract
The invention provides an LED (light emitting diode) driving power supply dimming circuit and a lamp. The LED driving power supply dimming circuit comprises a constant current unit, a control unit and an output protection unit, wherein the constant current unit is used for providing constant current, the first input end of the constant current unit receives a dimming control signal, the control unit is used for controlling the voltage output of a power supply power source according to the dimming control signal, the output protection unit is used for ensuring the stable output of the power supply voltage, the input end of the output protection unit is connected with the control unit, and the output end of the output protection unit is connected with a subordinate circuit. The LED driving power supply dimming circuit and the lamp have the advantages that the adaptation to PWM (pulse-width modulation) control signals with various frequencies and amplitude values can be realized, the universality can be realized, in addition, the input end is isolated from the subordinate circuit, and the effect of protecting the circuit is achieved.
Description
Technical field
The present invention relates to light adjusting circuit, particularly relate to LED drive power light adjusting circuit and light fixture.
Background technology
The LED drive power majority with dimming function all has dimming function, and most of light modulating LED driving powers all support the light modulation of 0 ~ 10V light modulation and pwm control signal.Use special integrated chip to realize dimming interface, although circuit is simple, cost is relatively higher, and pwm control signal requires that amplitude is fixed, and frequency is fixed.Light adjusting circuit standard disunity on market, output voltage amplitude and the frequency of pwm control signal are not quite similar, and the light adjusting circuit of prior art cannot meet multiple demand, does not thus have versatility.And dimming interface is directly connected by electronic components such as triodes with power supply feedback fraction circuit, do not do and isolate, may occur that in production or use procedure, dimming interface occurs that high voltage seals in and damages light adjusting circuit, even damages power supply, makes it not work like this.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcoming the existence of above-mentioned prior art, and a kind of LED drive power light adjusting circuit and light fixture are proposed, it can only receive a kind of pwm control signal setting amplitude and frequency by LED drive power light adjusting circuit in prior art, not there is versatility, and there will be the problems such as the phenomenon damaging circuit and power supply because not having the isolation of realizing circuit input and subordinate's circuit.
For solving the problems of the technologies described above, the present invention proposes a kind of LED drive power light adjusting circuit, and it comprises: constant current unit, and it is for providing constant electric current, it comprises first input end, the second input and output, and the first input end of constant current unit receives dimming control signal; Control unit, its voltage controlling power supply for this dimming control signal exports, it comprises optical coupler, the anode of optical coupler connects the first input end of constant current unit, the negative electrode of optical coupler connects the second input of constant current unit, the collector electrode of optical coupler connects power supply, and the emitter of optical coupler exports supply power voltage; And output protection unit, it is for guaranteeing the steady output of supply power voltage, and it comprises input and output, the emitter of the optical coupler of the input connection control unit of output protection unit, and the output of output protection unit connects subordinate's circuit; Wherein, supply power voltage changes according to the pulsewidth of pwm control signal or the size of voltage signal.
Preferably, this dimming control signal is pwm control signal, and supply power voltage changes according to the pulsewidth of pwm control signal.
Preferably, this dimming control signal is voltage signal, and supply power voltage changes according to the size of voltage signal.
Preferably, constant current unit comprises: the first resistance, the first diode, field effect transistor and the second resistance, and field effect transistor comprises input, output and control end; One end of first resistance connects the first input end of constant current unit, the output of constant current unit is connected after the other end of the first resistance connects the first diode, the input of field effect transistor connects the second input of constant current unit, the control end of field effect transistor connects the anode of the first diode, and the output of field effect transistor connects ground connection after the second resistance.
Preferably, constant current unit also comprises the first electric capacity for reducing the pwm control signal rate of climb, between the first input end that the first electric capacity is connected to constant current unit and output.
Preferably, field effect transistor is triode, and the base stage of triode is the control end of field effect transistor, the input of the current collection of triode very field effect transistor, the output of the transmitting of triode very field effect transistor.
Preferably, field effect transistor is metal-oxide-semiconductor, and the grid of metal-oxide-semiconductor is the control end of field effect transistor, and the source electrode of metal-oxide-semiconductor is the input of field effect transistor, and the drain electrode of metal-oxide-semiconductor is the output of field effect transistor.
Preferably; output protection unit comprises the second diode, the 3rd diode, the 3rd resistance, the 4th resistance and the second electric capacity; the negative electrode of the second diode connects the input of output protection unit; the anode of the second diode connects the output of output protection unit; one end of 3rd resistance connects the input of output protection unit; the output of output end unit is connected after other end connection the 3rd diode of the 3rd resistance; between the input that 4th resistance is connected to output protection unit and ground, between the output that the second electric capacity is connected to output protection unit and ground.
Preferably, the voltage range of voltage signal is 0 to 10V.
The present invention also proposes a kind of light fixture, and it comprises LED drive power light adjusting circuit as above.
Compared with prior art; the present invention has following beneficial effect: LED drive power light adjusting circuit of the present invention and light fixture; by the cooperation of constant-current supply and optical coupler; realize the conversion of pulse signal and voltage; circuit can be made simultaneously to support the light modulation of voltage signal and pwm control signal, and the pwm control signal of multi-frequency and voltage magnitude can be accepted, there is versatility; also achieve the isolation of circuit input end and subordinate's circuit, serve the effect of protective circuit.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of LED drive power light adjusting circuit of the present invention.
Wherein, description of reference numerals is as follows: constant current unit 1 first resistance R1 first diode D1 field effect transistor Q1 second resistance R2 first electric capacity C1 control unit 2 optical coupler U1 output protection unit 3 second diode D2 the 3rd diode D3 the 3rd resistance R3 the 4th resistance R4 second electric capacity C2.
Embodiment
In order to further illustrate principle of the present invention and structure, existing by reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
lED drive power light adjusting circuit embodiment
Refer to Fig. 1, the present invention proposes a kind of LED drive power light adjusting circuit, and it comprises: constant current unit 1, control unit 2 and output protection unit 3.
Constant current unit 1 is for providing constant electric current, and control unit 2 exports for the voltage controlling power supply according to dimming control signal, and output protection unit 3 is for guaranteeing the steady output of supply power voltage.
Constant current unit 1 comprises first input end, the second input and output, and the first input end of constant current unit 1 receives dimming control signal.Control unit 2 connects constant current unit 1 and output protection unit 3.Output protection unit 3 comprises input and output, the input connection control unit 2 of output protection unit 3, and the output of output protection unit 3 connects subordinate's circuit.In the present embodiment, this dimming control signal is pwm control signal or voltage signal.If this dimming control signal is pwm control signal, supply power voltage changes according to the pulsewidth of pwm control signal.If this dimming control signal is voltage signal, supply power voltage changes according to the size of described voltage signal.
Constant current unit 1 comprises: the first resistance R1, the first diode D1, field effect transistor Q1, the second resistance R2 and the first electric capacity C1.Field effect transistor Q1 comprises input, output and control end.One end of first resistance R1 connects the first input end of constant current unit 1, connects the output of constant current unit 1 after the other end of the first resistance R1 connects the first diode D1.The input of field effect transistor Q1 connects the second input of constant current unit 1, and the control end of field effect transistor Q1 connects the anode of the first diode D1, and the output of field effect transistor Q1 connects ground connection after the second resistance R2.Between the first input end that first electric capacity C1 is connected to constant current unit 1 and output.
In the present embodiment, the first resistance R1 and the first electric capacity C1 for reducing the pwm control signal rate of climb, to eliminate the impact to the light-emitting diode in this optical coupler U1.
In the present embodiment, field effect transistor Q1 is triode, and the base stage of triode is the control end of field effect transistor Q1, the input of the current collection of triode very field effect transistor Q1, the output of the transmitting of triode very field effect transistor Q1.
In other embodiment, field effect transistor Q1 is metal-oxide-semiconductor, and the grid of metal-oxide-semiconductor is the control end of field effect transistor Q1, and the source electrode of metal-oxide-semiconductor is the input of field effect transistor Q1, and the drain electrode of metal-oxide-semiconductor is the output of field effect transistor Q1.
Control unit 2 comprises optical coupler U1.The anode of optical coupler U1 connects the first input end of constant current unit 1, and the negative electrode of optical coupler U1 connects the second input of constant current unit 1, and the collector electrode of optical coupler U1 connects power supply, and the emitter of optical coupler U1 exports supply power voltage.This optical coupler U1 can change voltage signal into pulse signal.
Output protection unit 3 comprises the second diode D2, the 3rd diode D3, the 3rd resistance R3, the 4th resistance R4 and the second electric capacity C2.This second diode D2, the 3rd diode D3, the 3rd resistance R3, the 4th resistance R4 and the second electric capacity C2 form RCD absorbing circuit.The negative electrode of the second diode D2 connects the input of output protection unit 3; the anode of the second diode D2 connects the output of output protection unit 3; one end of 3rd resistance R3 connects the input of output protection unit 3; the output of output end unit is connected after other end connection the 3rd diode D3 of the 3rd resistance R3; between the input that 4th resistance R4 is connected to output protection unit 3 and ground, between the output that the second electric capacity C2 is connected to output protection unit 3 and ground.
In the present embodiment, the voltage range of voltage signal is 0 to 10V.
light fixture embodiment
The present invention also proposes a kind of light fixture, and it comprises LED drive power light adjusting circuit as above.
Operation principle of the present invention is described in detail below in conjunction with Fig. 1.
When after the first diode D1 conducting, its pressure drop is fixed and coating-forming voltage clamp circuit, and its voltage forms constant-current source by field effect transistor Q1 and the second resistance R2, and the electric current flowing through the light-emitting diode of optical coupler U1 is like this fixing.If be input as pwm control signal, output voltage can not change because of the amplitude of input pwm control signal, only can change along with the pulse width variations of input pwm control signal, realize the conversion of pulsewidth and voltage.Regulation voltage feedback loop is removed and the control realized power work state by output voltage.When being input as 0 ~ 10V voltage signal, be equivalent to pwm control signal duty ratio 100%, so input voltage is different, and corresponding output voltage also can be different, equally can realize the same transmission characteristic of pwm control signal.
Compared with prior art; the present invention has following beneficial effect: LED drive power light adjusting circuit of the present invention and light fixture; by the cooperation of constant-current supply and optical coupler; realize the conversion of pulse signal and voltage; circuit can be made to support the light modulation of voltage signal and pwm control signal simultaneously; and the pwm control signal of multi-frequency and voltage magnitude can be accepted, also achieve the isolation of circuit input end and subordinate's circuit, serve the effect of protective circuit.
These are only better possible embodiments of the present invention, not limit the scope of the invention, all utilizations specification of the present invention and the change of the equivalent structure done by accompanying drawing content, be all included in protection scope of the present invention.
Claims (10)
1. a LED drive power light adjusting circuit, is characterized in that, it comprises:
Constant current unit, it is for providing constant electric current, and it comprises first input end, the second input and output, and the first input end of described constant current unit receives a dimming control signal;
Control unit, it exports for the voltage according to this dimming control signal current control power supply, it comprises optical coupler, the anode of described optical coupler connects the first input end of described constant current unit, the negative electrode of described optical coupler connects the second input of described constant current unit, the collector electrode of described optical coupler connects described power supply, and the emitter of described optical coupler exports supply power voltage; And
Output protection unit, it is for guaranteeing the steady output of described supply power voltage, it comprises input and output, and the input of described output protection unit connects the emitter of the optical coupler of described control unit, and the output of described output protection unit connects subordinate's circuit;
Wherein, described supply power voltage changes according to the size of the pulsewidth of described pwm control signal or described voltage signal.
2. LED drive power light adjusting circuit as claimed in claim 1, it is characterized in that, this dimming control signal is pwm control signal, and described supply power voltage changes according to the pulsewidth of described pwm control signal.
3. LED drive power light adjusting circuit as claimed in claim 1, it is characterized in that, this dimming control signal is voltage signal, and described supply power voltage changes according to the size of described voltage signal.
4. LED drive power light adjusting circuit as claimed in claim 1, it is characterized in that, described constant current unit comprises: the first resistance, the first diode, field effect transistor and the second resistance, and described field effect transistor comprises input, output and control end; One end of described first resistance connects the first input end of described constant current unit, the output of described constant current unit is connected after described first diode of other end connection of described first resistance, the input of described field effect transistor connects the second input of described constant current unit, the control end of described field effect transistor connects the anode of described first diode, ground connection after described second resistance of output connection of described field effect transistor.
5. LED drive power light adjusting circuit as claimed in claim 4, it is characterized in that, described constant current unit also comprises the first electric capacity for reducing the described pwm control signal rate of climb, between the first input end that described first electric capacity is connected to described constant current unit and output.
6. LED drive power light adjusting circuit as claimed in claim 4, it is characterized in that, described field effect transistor is triode, the base stage of described triode is the control end of described field effect transistor, the input of the very described field effect transistor of current collection of described triode, the output of the very described field effect transistor of transmitting of described triode.
7. LED drive power light adjusting circuit as claimed in claim 4, it is characterized in that, described field effect transistor is metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is the control end of described field effect transistor, the source electrode of described metal-oxide-semiconductor is the input of described field effect transistor, and the drain electrode of described metal-oxide-semiconductor is the output of described field effect transistor.
8. LED drive power light adjusting circuit as claimed in claim 1, it is characterized in that, described output protection unit comprises the second diode, 3rd diode, 3rd resistance, 4th resistance and the second electric capacity, the negative electrode of described second diode connects the input of described output protection unit, the anode of described second diode connects the output of described output protection unit, one end of described 3rd resistance connects the input of described output protection unit, the output of described output end unit is connected after described 3rd diode of other end connection of described 3rd resistance, between the input that described 4th resistance is connected to described output protection unit and ground, between the output that described second electric capacity is connected to described output protection unit and ground.
9. LED drive power light adjusting circuit as claimed in claim 3, it is characterized in that, the voltage range of described voltage signal is 0 to 10V.
10. a light fixture, is characterized in that, it comprises the LED drive power light adjusting circuit as described in claim 1 to 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310627313.5A CN104684155B (en) | 2013-11-28 | 2013-11-28 | LED drive power light adjusting circuit and lamps and lanterns |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310627313.5A CN104684155B (en) | 2013-11-28 | 2013-11-28 | LED drive power light adjusting circuit and lamps and lanterns |
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| CN104684155A true CN104684155A (en) | 2015-06-03 |
| CN104684155B CN104684155B (en) | 2018-10-16 |
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Cited By (7)
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| CN105898921A (en) * | 2016-05-12 | 2016-08-24 | 中节能晶和照明有限公司 | High-voltage linear constant current PWM (Pulse Width Modulation) photoelectric isolation receiving end |
| CN106332403A (en) * | 2015-07-07 | 2017-01-11 | 海洋王（东莞）照明科技有限公司 | Dimming interface circuit |
| CN106658817A (en) * | 2016-09-30 | 2017-05-10 | 深圳市莱福德光电有限公司 | Dimming signal processing system applied to LED driving power supply |
| CN107153132A (en) * | 2016-03-02 | 2017-09-12 | 西门子公司 | Circuit, signal coupling input system and the switchgear that can be cascaded |
| CN107426874A (en) * | 2017-08-25 | 2017-12-01 | 赛尔富电子有限公司 | A kind of brightness adjustment control power supply for LED |
| CN108391347A (en) * | 2018-04-12 | 2018-08-10 | 上海阿卡得电子有限公司 | A kind of light adjusting circuit for LED drivings |
| CN112713501A (en) * | 2020-12-30 | 2021-04-27 | 徐州淮远电子科技有限公司 | Offset current compensation method and circuit for semiconductor laser driving circuit |
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| CN101861006A (en) * | 2010-04-09 | 2010-10-13 | 海洋王照明科技股份有限公司 | Dimming control circuit and illumination device |
| CN102135238A (en) * | 2010-01-21 | 2011-07-27 | 亮芯科技股份有限公司 | Light adjustable alternating current LED lamp and dimmer thereof |
| CN103167676A (en) * | 2011-12-15 | 2013-06-19 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) light adjustment control circuit and LED lamp with light adjustment control circuit |
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| CN101742758A (en) * | 2008-11-27 | 2010-06-16 | 台达电子工业股份有限公司 | Lighting driving system with dimming function |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106332403A (en) * | 2015-07-07 | 2017-01-11 | 海洋王（东莞）照明科技有限公司 | Dimming interface circuit |
| CN107153132A (en) * | 2016-03-02 | 2017-09-12 | 西门子公司 | Circuit, signal coupling input system and the switchgear that can be cascaded |
| CN107153132B (en) * | 2016-03-02 | 2020-04-14 | 西门子公司 | Cascadable circuit, signal coupling input system and switching device |
| CN105898921A (en) * | 2016-05-12 | 2016-08-24 | 中节能晶和照明有限公司 | High-voltage linear constant current PWM (Pulse Width Modulation) photoelectric isolation receiving end |
| CN106658817A (en) * | 2016-09-30 | 2017-05-10 | 深圳市莱福德光电有限公司 | Dimming signal processing system applied to LED driving power supply |
| CN106658817B (en) * | 2016-09-30 | 2018-06-22 | 深圳莱福德科技股份有限公司 | A kind of dim signal processing system for LED drive power |
| CN107426874A (en) * | 2017-08-25 | 2017-12-01 | 赛尔富电子有限公司 | A kind of brightness adjustment control power supply for LED |
| CN107426874B (en) * | 2017-08-25 | 2024-03-15 | 赛尔富电子有限公司 | Dimming control power supply for LED lamp |
| CN108391347A (en) * | 2018-04-12 | 2018-08-10 | 上海阿卡得电子有限公司 | A kind of light adjusting circuit for LED drivings |
| CN108391347B (en) * | 2018-04-12 | 2023-12-15 | 上海阿卡得电子有限公司 | Dimming circuit for LED driving |
| CN112713501A (en) * | 2020-12-30 | 2021-04-27 | 徐州淮远电子科技有限公司 | Offset current compensation method and circuit for semiconductor laser driving circuit |
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| CN104684155B (en) | 2018-10-16 |
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