CN104853476A - LED dimming circuit and LED lamp - Google Patents
LED dimming circuit and LED lamp Download PDFInfo
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- CN104853476A CN104853476A CN201510069150.2A CN201510069150A CN104853476A CN 104853476 A CN104853476 A CN 104853476A CN 201510069150 A CN201510069150 A CN 201510069150A CN 104853476 A CN104853476 A CN 104853476A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 11
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- 238000011217 control strategy Methods 0.000 abstract description 2
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Abstract
The invention provides an LED lamp including an LED dimming circuit connected with a dimming switch. The LED dimming circuit includes a rectification filtering unit, a switch device, a switch control unit, an output unit, a sampling resistor unit and a power adjusting unit. The power adjusting unit collects wave forms of the output voltage at the output terminal of the dimming switch. When the wave forms are normal sine waves, output power of the output unit is adjusted according to on-off frequency of the output voltage meeting requirements. When the wave forms are chopping sine waves, the output power of the output unit is adjusted to be the maximum. According to the invention, by detecting the wave forms of the current flowing through the adjusting switch and judging the type of the adjusting switch according to features of different influence on current of a common switch and a silicon controlled adjusting switch, different control strategies are used for controlling the output power of the control circuit, so that the compatibility between stepless dimming and segmentation dimming is achieved.
Description
Technical field
The present invention relates to LED illumination technology, particularly relate to a kind of LED light adjusting circuit and LED lamp.
Background technology
Existing segmented light modulation is use common wall type switch by different on-off times, to produce corresponding power output and brightness.Circuit realiration uses to have the functional circuit that number of times opened by identification switch, makes circuit produce corresponding power output and make LED send different brightness.But its weakness is light modulation is segmentation, usually only has 2 ~ 4 sections, can not stepless adjustment brightness linearly.Advantage uses to install simply.
Existing controllable silicon light modulation needs to use special controllable silicon dimmer, and the special power supply with controllable silicon light modulation function or light source could be with the use of.Its advantage is for can realize stepless dimming, but it can not general with sectional dimming.
Summary of the invention
The object of the invention be to provide a kind of can the LED light adjusting circuit of compatible stepless dimming and sectional dimming.
The invention provides a kind of LED light adjusting circuit, be connected with dimmer switch, comprise rectification filtering unit, switching device, switch control unit, output unit, sampling resistor unit and power adjustment unit, wherein:
The input of described rectification filtering unit connects AC power by described dimmer switch, export the positive input terminal of output unit described in termination, the negative input end of output unit described in the input termination of described switching device, the output of described switching device is by sampling resistor unit ground connection, the logic level signal that described switch control unit is exported by its output, to the control end of described switching device, controls the break-make of described switching device to control the output of described output unit; The output of dimmer switch described in one termination of described power adjustment unit, sampling resistor unit described in another termination;
Described power adjustment unit gathers the waveform of the output voltage of the output of described dimmer switch, when described waveform is normal sine wave, regulates the power output of described output unit according to described output voltage qualified break-make number of times; When described waveform is sinusoidal wave by copped wave, then the power output of described output unit is regulated to be maximum.
Present invention also offers a kind of LED lamp, be connected with dimmer switch, comprise above-mentioned LED light adjusting circuit.
Above-mentioned LED light adjusting circuit is by detecting the current waveform through by-pass cock, the characteristic of the Different Effects of Switch Controller electric current is regulated according to regular tap and controllable silicon, judge the type of by-pass cock thus use the power output of different control strategy control circuits, realizing the compatibility of stepless dimming and sectional dimming.Realize two different dimming functions with same circuit, then make people very easy to use, meet different product demand.
Accompanying drawing explanation
Fig. 1 is the module diagram of LED light adjusting circuit in present pre-ferred embodiments;
Fig. 2 is the circuit theory diagrams of the light adjusting circuit of LED shown in Fig. 1.
Embodiment
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, LED light adjusting circuit in LED lamp in present pre-ferred embodiments, i.e. Switching Power Supply, this LED light adjusting circuit is connected with output L, the zero line output N of dimmer switch 10 respectively, and LED light adjusting circuit comprises rectification filtering unit 100, switching device Q1, switch control unit 200, output unit 300, sampling resistor unit 400 and power adjustment unit 500.Switch control unit 200 is power-supply controller of electric, and concrete model or discrete component circuit are determined according to the circuit topology of selected Switching Power Supply.
The input of rectification filtering unit 100 meets AC power AC by dimmer switch 10, export the positive input terminal of termination output unit 300, the negative input end of the input termination output unit 300 of switching device Q1, the output of switching device Q1 is by sampling resistor unit 400 ground connection, the logic level signal that switch control unit 200 is exported by its output is to the control end of switching device Q1, and the break-make of control switch device Q1 is to control the output of output unit 300; The output (fire wire output end L or zero line output N) of one termination dimmer switch 10 of power adjustment unit 500, another termination sampling resistor unit 400.
Power adjustment unit 500 gathers the fire wire output end L of the dimmer switch 10 or output voltage V of zero line output N
lwaveform, when waveform is normal sinusoidal wave, judges that dimmer switch 10 leads to a key switch broken, according to output voltage V for common one
lthe power output of qualified break-make number of times regulation output unit 300, the high-speed switch number of times of what this break-make number of times was corresponding is dimmer switch 10, its condition is the time of twice unlatching is more than Preset Time, and Preset Time can be set as 1,2,3 second.When waveform is sinusoidal wave by copped wave, judge that dimmer switch 10 is as controllable silicon by-pass cock, then the power output of regulation output unit 300 is maximum, and namely under current input power, the maximum power that switching power circuit can export, switching device Q1 is 100%.
In embodiment more specifically, as output voltage V
lwhen waveform is normal sine wave, power adjustment unit 500 regulates the resistance of sampling resistor unit 400 to change the power output of output unit 300 according to the qualified break-make number of times of output voltage; When waveform is sinusoidal wave by copped wave, power adjustment unit 500 regulates sampling resistor unit 400 to make the power output of output unit 300 be maximum for maximum resistance.
Output unit 300 comprises the first diode D1, non-isolated transformer, the first filter capacitor C1 and the first output resistance R0.
The negative electrode of the first diode D1 connects rectification filtering unit 100 output, the anode of one termination first diode D1 of the main coil of non-isolated transformer T1, the input of switching device Q1, the two ends of the first filter capacitor C1 connect the other end of the main coil T1-1 of rectification filtering unit 100 output and non-isolated transformer respectively, and the first output resistance R0 is in parallel with the first filter capacitor C1.
Power adjustment unit 500 comprises input detecting circuit 520 and single-chip microcomputer U1, the fire wire output end L of the input termination dimmer switch 10 of input detecting circuit 520 or zero line output N, output output detections voltage V
jto the inputting testing terminal 3 of single-chip microcomputer U1.Sampling resistor unit 400 comprises the output that is connected to switching device Q1 with the first sampling resistor R1 between ground with organize the controlled sampling resistor module 410 in parallel with the first sampling resistor R1 more, each sampling resistor module 410 comprises the first switching tube M1 and the second sampling resistor R1A, the input of another termination first switching tube of output M1 of the one termination switching device Q1 of the second sampling resistor R1A, the output head grounding of the first switching tube M1, the logic level that the output port 7 that control end meets single-chip microcomputer U1 by input resistance R2 exports.The concrete model of single-chip microcomputer U1 is determined according to the circuit topology of selected Switching Power Supply.
In embodiment more specifically, single-chip microcomputer U1 judges the waveform of the detection voltage that input detecting circuit 520 exports, when waveform be normal sinusoidal wave time, judges that dimmer switch 10 is for common one logical one key switch broken, single-chip microcomputer U1 is according to detecting voltage V
jqualified break-make number of times, the first switching tube M1 that the logic level that multiple output port exports corresponding number controls corresponding number turns off, to change the power output of output unit 300; When waveform is sinusoidal wave by copped wave, judge that dimmer switch 10 is as controllable silicon by-pass cock, single-chip microcomputer U1 controls the first all switching tube M1 and turns off, and makes the power output of output unit 300 be maximum.In the present embodiment, sampling resistor module 410 is two, then single-chip microcomputer U1 utilizes the break-make of its first switching tube of two output ports 7,8 output logic Automatic level control M1.
Input detecting circuit 520 comprises detection resistance R3, the first voltage stabilizing didoe D2, divider resistance R4 and the first electric capacity of voltage regulation C2, detect fire wire output end L or the zero line output N of a termination dimmer switch 10 of resistance R3, the negative electrode of another termination first voltage stabilizing didoe D2, the anode of the first voltage stabilizing didoe D2 connects the inputting testing terminal 3 of single-chip microcomputer U1, and by divider resistance R4 ground connection, the first electric capacity of voltage regulation C2 is in parallel with divider resistance R4.
Power adjustment unit 500 also comprises the power circuit 540 for single-chip microcomputer U1 powers.Power circuit 540 comprises starting resistance R5 and R6, the second diode D3, the second electric capacity of voltage regulation C3, the second output resistance R7, the second voltage stabilizing didoe D4 and the second filter capacitor C4.
One termination rectification filtering unit 100 output of starting resistance R5 and R6, the other end is by connecing the negative electrode of the second diode D3, and by the second electric capacity of voltage regulation C3 ground connection, the anode of the second diode D3 connects the Same Name of Ends of the first ancillary coil T1-2 of non-isolated transformer, the other end ground connection of this first ancillary coil T1-2, the negative electrode of the second output resistance R7 mono-termination second diode D3, the negative electrode of another termination second voltage stabilizing didoe D4 and the power port of single-chip microcomputer U1, the plus earth of the second voltage stabilizing didoe D4, second filter capacitor C4 is in parallel with the second voltage stabilizing didoe D4.
In the above-described embodiments, switching device Q1 is NPN type triode, and the input of the first switching tube Q1, output, control end are respectively collector electrode, emitter, the base stage of triode.In a further embodiment, switching device Q1 also can be N-type metal-oxide-semiconductor, and the input of the first switching tube Q1, output, control end are respectively metal-oxide-semiconductor drain electrode, source electrode, grid.And the first switching tube M1 is N-type metal-oxide-semiconductor, the input of the first switching tube M1, output, control end are respectively metal-oxide-semiconductor drain electrode, source electrode, grid.
Rectification filtering unit 100, switching device Q1, switch control unit 200, output unit 300 and sampling resistor unit 400 form RCC (Ring Choke Convertor) formula LED dimming power source circuit.Rectification filtering unit 100 can utilize the circuit realiration shown in Fig. 2, also can select other traditional circuit according to the circuit topology of selected Switching Power Supply.Switch control unit 200 utilizes the second boost line T1-3 circle of the non-isolated transformer on output unit 300 to provide power supply.
LED light adjusting circuit workflow is as follows: when being regular tap in circuit, after opening switch, is given to the inputting testing terminal 3 of single-chip microcomputer U1 by input detecting circuit 520 input, and this port is responsible for detecting input voltage V
lwave character, be used for being given to the switchtype in single-chip microcomputer U1 internal judgment circuit.If the result detected is regular tap, then single-chip microcomputer works in sectional dimming pattern, and when the switch motion of corresponding number of times done by switch, then single-chip microcomputer exports corresponding logic level at output port 7 and 8, two the first switching tube M1 are made to be that corresponding ON/OFF combines, change the peak current of RCC formula LED dimming power source circuit, thus make power output be respectively maximum power/half-power/10% power three kinds state, to obtain different brightness.As opened switch for the first time, single-chip microcomputer U1 two output ports 7 and 8 are high level, now export total power; Second time shutdown switch is also opened at the appointed time, then single-chip microcomputer U1 only has one of them output port 7 or 8 to export high level, now exports as half-power; Third time turns off and opens switch, then single-chip microcomputer U1 two output ports 7 and 8 are low level, and now exporting is 10% power.
When accessing controllable silicon by-pass cock in LED light adjusting circuit, the waveform that single-chip microcomputer U1 inputs according to input detecting circuit 520, and work in controllable silicon light modulation mode.Namely single-chip microcomputer U1 two output ports 7 and 8 are all locked as high level, to make according to silicon controlled amplitude of accommodation linear change power in thyristor regulating photoreduction process, and can not jump into segmented model, can not have influence on silicon controlled and normally work.
Single-chip microcomputer U1 is used for detecting and identifies the operating state of LED light adjusting circuit, power output is changed by the peak current changed in LED power circuit, in the E pole (or S pole) of triode Q1 (or metal-oxide-semiconductor) by parallel multiplex metal-oxide-semiconductor, be used for switching and the mode changing output current to change power output.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a LED light adjusting circuit, is connected with dimmer switch, it is characterized in that, comprises rectification filtering unit, switching device, switch control unit, output unit, sampling resistor unit and power adjustment unit, wherein:
The input of described rectification filtering unit connects AC power by described dimmer switch, export the positive input terminal of output unit described in termination, the negative input end of output unit described in the input termination of described switching device, the output of described switching device is by sampling resistor unit ground connection, the logic level signal that described switch control unit is exported by its output, to the control end of described switching device, controls the break-make of described switching device to control the output of described output unit; The output of dimmer switch described in one termination of described power adjustment unit, sampling resistor unit described in another termination;
Described power adjustment unit gathers the waveform of the output voltage of the output of described dimmer switch, when described waveform is normal sine wave, regulates the power output of described output unit according to described output voltage qualified break-make number of times; When described waveform is sinusoidal wave by copped wave, then the power output of described output unit is regulated to be maximum.
2. LED light adjusting circuit as claimed in claim 1, it is characterized in that, when waveform is normal sine wave, described power adjustment unit regulates the resistance of described sampling resistor unit to change the power output of described output unit according to described output voltage qualified break-make number of times; When waveform is sinusoidal wave by copped wave, described power adjustment unit regulates described sampling resistor unit to be that maximum resistance makes the power output of described output unit be maximum.
3. LED light adjusting circuit as claimed in claim 1 or 2, it is characterized in that, described power adjustment unit comprises input detecting circuit and single-chip microcomputer, the output of dimmer switch described in the input termination of described input detecting circuit, and output output detections voltage is to the inputting testing terminal of described single-chip microcomputer;
Described sampling resistor unit comprises the output that is connected to described switching device with the first sampling resistor between ground with organize the controlled sampling resistor module in parallel with described first sampling resistor more, each described sampling resistor module comprises the first switching tube and the second sampling resistor, the input of the first switching tube described in another termination of output of switching device described in one termination of described second sampling resistor, the output head grounding of described first switching tube, the logic level that the output port controlling single-chip microcomputer described in termination exports.
4. LED light adjusting circuit as claimed in claim 3, it is characterized in that, described single-chip microcomputer judges the waveform of the detection voltage that described input detecting circuit exports, when waveform is normal sine wave, described single-chip microcomputer is according to the qualified break-make number of times of described detection voltage, the logic level exporting corresponding number controls the described first switching tube shutoff of corresponding number, to change the power output of described output unit; When waveform is sinusoidal wave by copped wave, the described first switching tube shutoff that described Single-chip Controlling is all, makes the power output of described output unit be maximum.
5. LED light adjusting circuit as claimed in claim 3, it is characterized in that, described input detecting circuit comprises detection resistance, the first voltage stabilizing didoe, divider resistance and the first electric capacity of voltage regulation, the fire wire output end of dimmer switch described in one termination of described detection resistance or zero line output, the negative electrode of the first voltage stabilizing didoe described in another termination, the anode of described first voltage stabilizing didoe connects the inputting testing terminal of described single-chip microcomputer, and by described divider resistance ground connection, described first electric capacity of voltage regulation is in parallel with described divider resistance.
6. LED light adjusting circuit as claimed in claim 3, is characterized in that, described power adjustment unit also comprises the power circuit of powering for described single-chip microcomputer.
7. LED light adjusting circuit as claimed in claim 6, it is characterized in that, described output unit comprises the first diode, non-isolated transformer, the first filter capacitor and the first output resistance, wherein:
The negative electrode of described first diode connects described rectification filtering unit output, the anode of the first diode, the input of described switching device described in one termination of the main coil of described non-isolated transformer, the two ends of described first filter capacitor connect the other end of the main coil of described rectification filtering unit output and described non-isolated transformer respectively, and described first output resistance is in parallel with described first filter capacitor.
8. LED light adjusting circuit as claimed in claim 7, it is characterized in that, described power circuit comprises starting resistance, the second diode, the second electric capacity of voltage regulation, the second output resistance, the second voltage stabilizing didoe and the second filter capacitor, wherein;
Rectification filtering unit output described in one termination of described starting resistance, the other end is by connecing the negative electrode of described second diode, and by described second electric capacity of voltage regulation ground connection, the anode of described second diode connects the Same Name of Ends of the first ancillary coil of described non-isolated transformer, the other end ground connection of this first ancillary coil, the negative electrode of the second diode described in described second output resistance one termination, the negative electrode of the second voltage stabilizing didoe described in another termination and the power port of described single-chip microcomputer, the plus earth of described second voltage stabilizing didoe, described second filter capacitor is in parallel with described second voltage stabilizing didoe.
9. a LED lamp, is connected with dimmer switch, it is characterized in that, comprises the LED light adjusting circuit described in any one of claim 1 to 8.
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| CN201510069150.2A CN104853476B (en) | 2015-02-10 | 2015-02-10 | LED light adjusting circuits and LED lamp |
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| CN201510069150.2A CN104853476B (en) | 2015-02-10 | 2015-02-10 | LED light adjusting circuits and LED lamp |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106954302A (en) * | 2017-03-30 | 2017-07-14 | 四川万康节能环保科技有限公司 | A double-transformer control circuit for electronic energy-saving lamps |
| CN108093523A (en) * | 2017-12-26 | 2018-05-29 | 深圳市崧盛电子股份有限公司 | AC dump and the control circuit and power supply of light modulation shut-off |
| WO2018214728A1 (en) * | 2017-05-23 | 2018-11-29 | 深圳市晟碟半导体有限公司 | System and method using switch to realize light fixture dimming and state restoration |
| CN111278194A (en) * | 2018-11-16 | 2020-06-12 | 朗德万斯公司 | High-precision LED driver |
| CN112543532A (en) * | 2020-12-15 | 2021-03-23 | 上海晶丰明源半导体股份有限公司 | Dimming control circuit and device thereof |
| CN112770461A (en) * | 2020-12-25 | 2021-05-07 | 漳州立达信光电子科技有限公司 | Dimming circuit and dimming equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106954302A (en) * | 2017-03-30 | 2017-07-14 | 四川万康节能环保科技有限公司 | A double-transformer control circuit for electronic energy-saving lamps |
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| CN111278194A (en) * | 2018-11-16 | 2020-06-12 | 朗德万斯公司 | High-precision LED driver |
| CN112543532A (en) * | 2020-12-15 | 2021-03-23 | 上海晶丰明源半导体股份有限公司 | Dimming control circuit and device thereof |
| CN112543532B (en) * | 2020-12-15 | 2023-09-26 | 上海晶丰明源半导体股份有限公司 | Dimming control circuit and device thereof |
| CN112770461A (en) * | 2020-12-25 | 2021-05-07 | 漳州立达信光电子科技有限公司 | Dimming circuit and dimming equipment |
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| CN104853476B (en) | 2017-07-18 |
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