CN103108472B - Intermittent service dimming light-emitting diode (LED) lamp drive circuit - Google Patents
Intermittent service dimming light-emitting diode (LED) lamp drive circuit Download PDFInfo
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- CN103108472B CN103108472B CN201310051925.4A CN201310051925A CN103108472B CN 103108472 B CN103108472 B CN 103108472B CN 201310051925 A CN201310051925 A CN 201310051925A CN 103108472 B CN103108472 B CN 103108472B
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Abstract
The invention discloses an intermittent service dimming light-emitting diode (LED) lamp drive circuit. The intermittent service dimming LED lamp drive circuit is arranged between an electronic transformer and an LED lamp and comprises a single chip microcomputer, a rectifier bridge circuit, a boost circuit, an input signal detection circuit, a power circuit, a main electrolytic capacitor voltage detection circuit, an LED voltage detection circuit, a buck drive circuit and a dimming signal reception circuit. The boost circuit with a fixed duty ratio is adopted by a preceding stage of the intermittent service dimming LED lamp drive circuit, an intermittent working mode is adopted to stabilize the main electrolytic capacitor voltage, and start and stop of the boost circuit are carried out on a low frequency envelope valley bottom of the input voltage. Therefore, each time the electronic transformer works, the same current is provided to the load, stable and normal work of the electronic transformer is guaranteed, and no extra circuit loss is added. Besides, only a large electrolytic capacitor instead of an extra expansive element is needed by the circuit, and the aim of meeting requirements can be achieved while cost is barely added.
Description
Technical field
The present invention relates to LED lamp drive circuit, more particularly, relate to a kind of LED lamp drive circuit of discontinuous operation pattern of tunable optical that can compatible electronic transformer.
Background technology
At present, a lot of LED lamps all require compatible traditional electric supply installation, for example traditional Halogen lamp LED adopts electronic transformer as electric supply installation conventionally, and the MR16 type LED lamp of replacing Halogen lamp LED is also required the electronic transformer of compatible Halogen lamp LED conventionally, because the light beam of MR16 shot-light is concentrated, be difficult to be replaced by fluorescent lamp, so adopt the MR16 lamp of LED light source to have demand very widely.But, in prior art, the characteristic impedance difference of LED lamp and traditional Halogen lamp LED is very big, in process with LED lamp replacement Halogen lamp LED, can cause a lot of problems, especially the consumed power that insoluble problem is LED lamp is significantly smaller than traditional Halogen lamp LED, and electronic transformer requires have certain load current just can maintain normal work, and the consumed power of LED lamp itself is just far below Halogen lamp LED, in addition light modulation post consumption power is lower, this characteristic is easy to cause when the light modulation of LED lamp to brightness hour, and the problem of glimmering appears in a lot of LED lamps.In order to address this problem, some schemes are to increase a resistive load in parallel in order to increase overall current sinking to existing LED lamp, can waste electric energy but do like this, make the power savings advantages of changing LED lamp lose meaning.
Summary of the invention
The problem that the job insecurity occurring for the light-adjustable LED lamp connecting electronic transformer existing in prior art especially glimmers, the object of this invention is to provide a kind of discontinuous operation dimming LED lamp drive circuit, thereby can make electronic transformer output current keep certain numerical value steady operation, cause lowering efficiency and do not increase extra power consumption circuit.
For achieving the above object, the present invention adopts following technical scheme:
A kind of discontinuous operation dimming LED lamp drive circuit, is located between electronic transformer and LED lamp, comprising:
Single-chip microcomputer;
Rectifier circuit, is connected with the output of electronic transformer, and described high speed rectifier circuit is made up of the first Schottky diode, the second Schottky diode, the 3rd Schottky diode and the 4th Schottky diode;
Boost booster circuit, its input is connected with the output of described rectifier circuit, and described boost booster circuit comprises the second inductance, the 5th Schottky diode and the first metal-oxide-semiconductor field effect transistor; Described the first metal-oxide-semiconductor field effect transistor is connected with single-chip microcomputer;
Circuit for checking input signals, its input is connected with the output of described rectifier circuit, and described circuit for checking input signals comprises the low pass filter being made up of the first resistance and the first electric capacity, and described low pass filter is connected with single-chip microcomputer;
Power circuit, its input is connected with the output of described boost booster circuit, is made up of linear stabilized power supply and the 6th resistance;
Main electrochemical capacitor voltage detecting circuit and LED voltage detecting circuit, its input is connected with the output of described boost booster circuit, comprises main electrochemical capacitor, for the bleeder circuit of the main electrochemical capacitor voltage of single chip computer measurement and for the bleeder circuit of the voltage difference of the main electrochemical capacitor of single chip computer measurement and LED; The described bleeder circuit for the main electrochemical capacitor voltage of single chip computer measurement is made up of the second resistance and the 3rd resistance; The bleeder circuit of the described voltage difference for the main electrochemical capacitor of single chip computer measurement and LED is made up of the 4th resistance and the 5th resistance;
Buck step-down drive circuit, its input is connected with the output of described boost booster circuit, described buck step-down drive circuit comprises the 3rd inductance, the 6th Schottky diode and the second metal-oxide-semiconductor field effect transistor, and described the second metal-oxide-semiconductor field effect transistor is connected with single-chip microcomputer;
Dim signal receiving circuit, comprises phototriode, and described phototriode is connected with the external interrupt pin of single-chip microcomputer;
Wherein, the prime of described discontinuous operation dimming LED lamp drive circuit adopts the boost booster circuit of fixed duty cycle, adopt intermittent duty to stablize main electrochemical capacitor voltage, opening and closing boost booster circuit carries out in the low frequency envelope the lowest point of the input supply voltage of single-chip microcomputer.
The cut-off frequency of described low pass filter, between the high and low frequency signal component of electronic transformer output, is retaining low frequency filtering simultaneously high-frequency signal composition, and phase place and the frequency of low frequency signal are constant.
The cut-off frequency of described low pass filter is 800Hz.
Described single-chip microcomputer carries out AD conversion to obtain low frequency signal phase place and the frequency information of input supply voltage of single-chip microcomputer to the analog signal of low pass filter output, carries out for the lowest point of opening and be closed in low frequency signal of guaranteeing boost booster circuit.
The interval working duty ratio of described boost booster circuit, by main decomposition voltage control, allows to close boost booster circuit in the time that main electrochemical capacitor voltage reaches capping, and reaches and under setting, allow to open boost booster circuit in limited time at main electrochemical capacitor voltage.
Described single-chip microcomputer detects main electrochemical capacitor voltage at low side, and single-chip microcomputer detects the poor of main electrochemical capacitor voltage and LED voltage at low side, and single-chip microcomputer obtains LED voltage by calculating, and all voltage detecting are low side and detect.
The power supply of described discontinuous operation dimming LED lamp drive circuit is obtained from main electrochemical capacitor through the step-down of the 6th resistance by linear stabilized power supply, while opening, provides enough firing currents by start-up capacitance to discontinuous operation dimming LED lamp drive circuit.
Described discontinuous operation dimming LED lamp drive circuit also comprises and strengthens drive current circuit, described enhancing drive current circuit between described boost booster circuit and single-chip microcomputer or/and between described buck step-down drive circuit and single-chip microcomputer; Described enhancing drive current circuit is made up of positive-negative-positive triode and NPN type triode.Taking buck step-down drive circuit as example, buck step-down drive circuit works is at voltage mode, use single-chip microcomputer CCP module to control as driving, drive signal through the buffer circuit that form by positive-negative-positive triode and NPN type triode to the grid of the second metal-oxide-semiconductor field effect transistor as control signal.
Compared with prior art, adopt a kind of discontinuous operation dimming LED lamp drive circuit of the present invention, when the every task of electronic transformer, can provide same electric current to load, can ensure that homeostasis works normally, can not increase again extra circuit loss.Meanwhile, this circuit only need to adopt more relatively large electrochemical capacitor and not need to increase extra expensive device, needs hardly to increase cost and can reach the object needing.
Brief description of the drawings
Fig. 1 is the schematic diagram of a kind of discontinuous operation dimming LED lamp drive circuit of the present invention;
Fig. 2 is the circuit diagram of a kind of discontinuous operation dimming LED lamp drive circuit of the present invention.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.
Refer to Fig. 1, shown in Fig. 2, wherein single-chip microcomputer U1 is STC12C5208AD, and linear stabilized power supply U2 is 78L05, the first Schottky diode D1, the second Schottky diode D2, the 3rd Schottky diode D3, the 4th Schottky diode D4, the 5th Schottky diode D5, the model of the 6th Schottky diode D6 is SS110, and the first inductance L 1 is 2.2uH, and the second inductance L 2 is 10uH, and the 3rd inductance L 3 is 47uH, and the first capacitor C 1 is 10nF, the second capacitor C 2, the 3rd capacitor C 3, the 5th capacitor C 5 is 1uF, and main electrochemical capacitor C4 is 220uF, and the 6th capacitor C 6 is 6.8uF, the first resistance R 1, the 3rd resistance R 3, the 5th resistance R 5 is 1k Ω, and the second resistance R 2 is 10k Ω, and the 4th resistance R 4 is 8.2k Ω, and the 6th resistance R 6 is 2k Ω, NPN type triode Q2, Q5 is NPN transistor 2N5551, positive-negative-positive triode Q3, Q6 is PNP transistor BC817, the first metal-oxide-semiconductor field effect transistor Q4, the second metal-oxide-semiconductor field effect transistor Q7 is field effect transistor FDC5661, and phototriode Q1 is 3DU5C, and fuse F1 is 2A.
In Fig. 2, the first Schottky diode D1, the second Schottky diode D2, the 3rd Schottky diode D3, the 4th Schottky diode D4 composition high speed rectifier bridge, the operating frequency of electronic transformer generally in 40kHZ between 100kHZ, the rectifier bridge being made up of Schottky diode has very high switching speed, and performance is enough to coordinate electronic transformer normally to be worked.The first inductance L 1 and the first capacitor C 1 are EMI filter element, and fuse F1 is protection component.The first resistance R 1 and the first capacitor C 1 form low-pass filter circuit, and the cut-off frequency of circuit is arranged on 800HZ, and this characteristic can ensure that the high-frequency signal frequency content of filtering electronic transformer retains its low frequency signal frequency content simultaneously.Low frequency signal frequency content input single-chip microcomputer carries out AD conversion as temporal information.Phototriode Q1 is connected in single-chip microcomputer external interrupt INT0 pin, can use interrupt mode to send dim signal to single-chip microcomputer.The second inductance L 2, the 5th Schottky diode D5, the first metal-oxide-semiconductor field effect transistor Q4 composition boost circuit, NPN type triode Q2, positive-negative-positive triode Q3 are for strengthening drive current circuit, adopt boost circuit can ensure the continuity of input current, can failure of oscillation thereby make electronic transformer oscillation circuit maintain certain electric current.The driving of circuit at the corresponding levels comes from the CCP module of single-chip microcomputer, and its duty ratio is what fix, and so each work period can be exported fixing energy to storage capacitor C4.The more important thing is, the boost circuit that has fixing duty ratio absorbs stable electric current, and this characteristic can ensure every low frequency operation cycle output current of electronic transformer size that is consistent, can be because electric current be too small failure of oscillation.The voltage swing control of the work acceptor electrochemical capacitor C4 of Boost module, sets lower prescribing a time limit when C4 capacitance voltage drops to, and boost circuit is started working before the next one cycle of opening of electronic transformer starts.In the time that the capacitance voltage of main electrochemical capacitor C4 rises to capping, boost circuit quits work.This boost circuit working is at fixed duty cycle, and discontinuous operation pattern, in order to adapt to electronic transformer work.The 3rd inductance L 3, the 6th Schottky diode D6, the second metal-oxide-semiconductor field effect transistor Q7 composition buck reduction voltage circuit are powered to LED.NPN type triode Q5, positive-negative-positive triode Q6 are for strengthening drive current circuit.Adopt buck circuit can reduce the ripple current that flows through LED.The driving of circuit at the corresponding levels is equally from the CCP module of single-chip microcomputer, the continuously-running duty that its working method is variable duty ratio.The light modulation degree that the duty ratio of buck circuit working at the corresponding levels is set by the user, voltage and the LED voltage of main electrochemical capacitor C4 determine jointly.The second resistance R 2 and the 3rd resistance R 3 form bleeder circuit in order to the main electrochemical capacitor voltage of single chip computer measurement, the 4th R4 and the 5th resistance R 5 form the voltage difference of bleeder circuit to the main electrochemical capacitor of single chip computer measurement and LED, and the difference of two voltages that measure is LED voltage.The decompression voltage regulator of the 6th resistance R 6 and linear stabilized power supply U2 composition provides stable power supply supply to whole operating circuit.The 6th capacitor C 6 act as while startup and provides electric current to single-chip microcomputer.
The overall operation schematic circuit of circuit is that, while powering on, electric current is given main electrochemical capacitor C4 charging by the second inductance L 2 and the 5th Schottky diode D5.Due to the existence of the 6th capacitor C 6, in the time that main electrochemical capacitor C4 voltage rises, single-chip microcomputer can obtain enough voltage by 78L05 and start the program.Program is started working after single-chip microcomputer powers on, and because the main electrochemical capacitor C4 voltage ratio measuring is lower, lower than minimum set point 25V, single-chip microcomputer will make the first metal-oxide-semiconductor field effect transistor Q4 work.Program is in order to tackle the starting stage, when main electrochemical capacitor C4 is during lower than 25V, no matter has or not and reaches electronic transformer output voltage the lowest point, all opens boost circuit.Boost level is exported backward energy and is greater than the ceiling capacity that buck circuit is LED section consumption.Boost level quits work in the time that main electrochemical capacitor C4 voltage exceedes 45V, until main electrochemical capacitor C4 voltage is again open-minded again while being less than 25V, carry out the lowest point that is engraved in input voltage while opening, input voltage waveform can obtain by the AD transformation result of low-pass filter circuit, sets on this basis opening the moment of boost.In the time that main electrochemical capacitor C4 voltage exceedes 25V, buck circuit is started working.The setting brightness of single-chip microcomputer lamp when reading EEPROM and obtain last time power-off and the magnitude of voltage of LED.Buck circuit is by the brightness value of setting according to last time, and corresponding the second metal-oxide-semiconductor field effect transistor Q7 duty ratio of the terminal voltage synthetic setting of main electrochemical capacitor C4 voltage and LED.Normal operation, after 2 seconds, is read new LED voltage regular update by single-chip microcomputer, and sets duty ratio with new LED voltage.The continuous operation always of Buck circuit.When normal work, main electrochemical capacitor C4 voltage between 45V, can ensure the normal work of 78L05 at 25V, and the existence of the 6th resistance R 6 can be protected the safety of 78L05.User can upgrade by the remote control of phototriode Q1 receiving optical signals the brightness value of lamp, also can realize standby.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for object of the present invention is described, and not as limitation of the invention, as long as in essential scope of the present invention, variation, modification to the above embodiment all will drop in the scope of claim of the present invention.
Claims (8)
1. a discontinuous operation dimming LED lamp drive circuit, is located between electronic transformer and LED lamp, it is characterized in that, comprising:
Single-chip microcomputer;
Rectifier circuit, is connected with the output of electronic transformer;
Boost booster circuit, its input is connected with the output of described rectifier circuit, and described boost booster circuit comprises the second inductance, the 5th Schottky diode and the first metal-oxide-semiconductor field effect transistor; Described the first metal-oxide-semiconductor field effect transistor is connected with single-chip microcomputer;
Circuit for checking input signals, its input is connected with the output of described rectifier circuit, and described circuit for checking input signals comprises the low pass filter being made up of the first resistance and the first electric capacity, and described low pass filter is connected with single-chip microcomputer;
Power circuit, its input is connected with the output of described boost booster circuit, is made up of linear stabilized power supply and the 6th resistance;
Main electrochemical capacitor voltage detecting circuit and LED voltage detecting circuit, its input is connected with the output of described boost booster circuit, comprises main electrochemical capacitor, for the bleeder circuit of the main electrochemical capacitor voltage of single chip computer measurement and for the bleeder circuit of the voltage difference of the main electrochemical capacitor of single chip computer measurement and LED; The described bleeder circuit for the main electrochemical capacitor voltage of single chip computer measurement is made up of the second resistance and the 3rd resistance; The bleeder circuit of the described voltage difference for the main electrochemical capacitor of single chip computer measurement and LED is made up of the 4th resistance and the 5th resistance;
Buck step-down drive circuit, its input is connected with the output of described boost booster circuit, described buck step-down drive circuit comprises the 3rd inductance, the 6th Schottky diode and the second metal-oxide-semiconductor field effect transistor, and described the second metal-oxide-semiconductor field effect transistor is connected with single-chip microcomputer;
Dim signal receiving circuit, comprises phototriode, and described phototriode is connected with the external interrupt pin of single-chip microcomputer;
Wherein, the prime of described discontinuous operation dimming LED lamp drive circuit adopts the boost booster circuit of fixed duty cycle, adopt intermittent duty to stablize main electrochemical capacitor voltage, opening and closing boost booster circuit carries out in the low frequency envelope the lowest point of the input supply voltage of single-chip microcomputer.
2. discontinuous operation dimming LED lamp drive circuit according to claim 1, is characterized in that:
The cut-off frequency of described low pass filter, between the high and low frequency signal component of electronic transformer output, is retaining low frequency filtering simultaneously high-frequency signal composition, and phase place and the frequency of low frequency signal are constant.
3. discontinuous operation dimming LED lamp drive circuit according to claim 2, is characterized in that:
The cut-off frequency of described low pass filter is 800Hz.
4. discontinuous operation dimming LED lamp drive circuit according to claim 1, is characterized in that:
Described single-chip microcomputer carries out AD conversion to obtain low frequency signal phase place and the frequency information of input supply voltage of single-chip microcomputer to the analog signal of low pass filter output, carries out for the lowest point of opening and be closed in low frequency signal of guaranteeing boost booster circuit.
5. discontinuous operation dimming LED lamp drive circuit according to claim 1, is characterized in that:
The interval working duty ratio of described boost booster circuit, by main decomposition voltage control, allows to close boost booster circuit in the time that main electrochemical capacitor voltage reaches capping, and reaches and under setting, allow to open boost booster circuit in limited time at main electrochemical capacitor voltage.
6. discontinuous operation dimming LED lamp drive circuit according to claim 1, is characterized in that:
Described single-chip microcomputer detects main electrochemical capacitor voltage at low side, and single-chip microcomputer detects the poor of main electrochemical capacitor voltage and LED voltage at low side, and single-chip microcomputer obtains LED voltage by calculating, and all voltage detecting are low side and detect.
7. discontinuous operation dimming LED lamp drive circuit according to claim 1, is characterized in that:
The power supply of described discontinuous operation dimming LED lamp drive circuit is obtained from main electrochemical capacitor through the step-down of the 6th resistance by linear stabilized power supply, while opening, provides enough firing currents by start-up capacitance to discontinuous operation dimming LED lamp drive circuit.
8. according to the discontinuous operation dimming LED lamp drive circuit described in any one in claim 1 to 7, it is characterized in that:
Described discontinuous operation dimming LED lamp drive circuit also comprises and strengthens drive current circuit, described enhancing drive current circuit between described boost booster circuit and single-chip microcomputer or/and between described buck step-down drive circuit and single-chip microcomputer; Described enhancing drive current circuit is made up of positive-negative-positive triode and NPN type triode.
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| CN201310051925.4A CN103108472B (en) | 2013-02-17 | 2013-02-17 | Intermittent service dimming light-emitting diode (LED) lamp drive circuit |
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| CN201310051925.4A CN103108472B (en) | 2013-02-17 | 2013-02-17 | Intermittent service dimming light-emitting diode (LED) lamp drive circuit |
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| CN103108472B true CN103108472B (en) | 2014-10-29 |
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| CN104797048B (en) * | 2015-04-15 | 2017-09-01 | 深圳市通普科技有限公司 | A kind of compatible Halogen lamp LED Dimmable LED driving power supply and illuminator |
| WO2019126584A1 (en) * | 2017-12-20 | 2019-06-27 | Lumileds Llc | Dimmer interface having reduced power consumption |
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| CN102348313A (en) * | 2010-07-29 | 2012-02-08 | 松下电工株式会社 | LED lighting device, illuminating apparatus with the LED lighting device and illuminating system |
| CN102740571A (en) * | 2012-07-18 | 2012-10-17 | 矽力杰半导体技术(杭州)有限公司 | Dimmable LED (Light-Emitting Diode) driving circuit and driving method |
| CN202535592U (en) * | 2012-03-01 | 2012-11-14 | 杭州乐图光电科技有限公司 | MR16LED lamp driving circuit and MR16LED lamp lighting system using the same |
| CN202721870U (en) * | 2012-07-31 | 2013-02-06 | 四川新力光源股份有限公司 | Built-in dimming driving module for LED |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080018261A1 (en) * | 2006-05-01 | 2008-01-24 | Kastner Mark A | LED power supply with options for dimming |
| TWI508622B (en) * | 2008-08-28 | 2015-11-11 | Koninkl Philips Nv | Method and circuit for controlling an led load |
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- 2013-02-17 CN CN201310051925.4A patent/CN103108472B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348313A (en) * | 2010-07-29 | 2012-02-08 | 松下电工株式会社 | LED lighting device, illuminating apparatus with the LED lighting device and illuminating system |
| CN202535592U (en) * | 2012-03-01 | 2012-11-14 | 杭州乐图光电科技有限公司 | MR16LED lamp driving circuit and MR16LED lamp lighting system using the same |
| CN102740571A (en) * | 2012-07-18 | 2012-10-17 | 矽力杰半导体技术(杭州)有限公司 | Dimmable LED (Light-Emitting Diode) driving circuit and driving method |
| CN202721870U (en) * | 2012-07-31 | 2013-02-06 | 四川新力光源股份有限公司 | Built-in dimming driving module for LED |
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