CN103313490B - Control circuit of three-way dimming LED (light-emitting diode) lights - Google Patents
Control circuit of three-way dimming LED (light-emitting diode) lights Download PDFInfo
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- CN103313490B CN103313490B CN201310283106.2A CN201310283106A CN103313490B CN 103313490 B CN103313490 B CN 103313490B CN 201310283106 A CN201310283106 A CN 201310283106A CN 103313490 B CN103313490 B CN 103313490B
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Abstract
The invention relates to a control circuit of a three-way dimming LED lights. The control circuit of the three-way dimming LED lights is characterized by comprising a three-way option switch circuit, a rectifying circuit, two detection circuits, a constant-current control circuit and a group of LED lights, wherein alternating currents pass through the three-way option switch circuit to be connected with the rectifying circuit, the rectifying circuit is output to the constant-current control circuit after AC-DC (alternating current-direct current) conversion, the constant-current control circuit outputs to supply electricity to the LED lights, the output ends of the three-way option switch circuit are connected with the detection circuits, and the output ends of the detection circuits are connected with current control ends of a constant-current chip in the constant-current control circuit. According to the control circuit of the three-way dimming LED lights, the detection circuits are added to adjust the resistance value of a current control end of the constant-current chip U1, the working of the three-way dimming LED lights can be completed with only one main loop and a circuit of LED lights, the circuit is simplified and the costs are reduced. Besides, the control circuit of the three-way dimming LED lights can be widely applied to isolated power sources, non-isolated power sources and primary control constant-current circuits.
Description
Technical field
The present invention relates to a kind of LED illumination light source technology, particularly a kind of three-stage dimming LED control circuit.
Background technology
Existing three-stage dimming incandescent lamp structure is shown in accompanying drawing 1, has used two segment filaments, low watt of filament 1 and in watt filament 3, a common segment 2, three input lines, utilize mechanical switch, different power-up sequence realizes different combinations, and reaches the function of 3 kinds of luminous fluxes, explains and sees accompanying drawing 2 winding diagram.LED will substitute this kind of incandescent lamp, and inside just needs to reach this kind of function with two power supplys, and circuit is complicated, and cost is high, takies lamp body space comparatively large, is unfavorable for assembling, be unfavorable for heat radiation.
Summary of the invention
The present invention be directed to existing three-stage dimming incandescent lamp to control to need two-way power supply, the problem of circuit complexity, propose a kind of three-stage dimming LED control circuit, simplify circuit, reduce costs.
Technical scheme of the present invention is: a kind of three-stage dimming LED control circuit, comprise three sections of selected on-off circuits, a road rectification circuit, two alignment detection circuits, a road constant-current control circuit and one group of LED, alternating current connects rectification circuit through three sections of selected on-off circuits, constant-current control circuit is outputted to after rectification circuit AC-DC conversion, constant-current control circuit is exported to LED and is powered, three sections of selected on-off circuits export termination two-way testing circuit, and testing circuit exports and connects constant current chip current controling end in constant-current control circuit.
Described three sections of selected on-off circuits export two-way alternating current, wherein two sections of output two-way roads wherein that conducting is corresponding respectively, and the 3rd section is connect to export two-way simultaneously.Described two alignment detection circuits connect three sections of selected on-off circuit two-way outputs respectively, every alignment detection circuit comprises diode, sampling resistor, metal-oxide-semiconductor and feedback resistance, three sections of selected on-off circuit output AC electricity pass through diode and the sampling resistor ground connection of corresponding testing circuit series connection, sampling resistor powers on force feed metal-oxide-semiconductor control end, metal-oxide-semiconductor conducting, feedback resistance access constant current chip current controling end.
Beneficial effect of the present invention is: three-stage dimming LED control circuit of the present invention, adopts to exchange to detect, and primary control mode, realizes three-stage dimming function with a set of main circuit, simplify circuit, reduces element composition, reduces costs, reduce power supply size.Insulating power supply and non-isolated power supply can be widely used in, in primary control constant-current circuit.
Accompanying drawing explanation
Fig. 1 is existing three-stage dimming incandescent lamp structural representation;
Fig. 2 is existing three-stage dimming incandescent lamp winding diagram;
Fig. 3 is existing three-stage dimming incandescent lamp first luminous flux operating diagram;
Fig. 4 is existing three-stage dimming incandescent lamp second luminous flux operating diagram;
Fig. 5 is existing three-stage dimming incandescent lamp the 3rd luminous flux operating diagram;
Fig. 6 is existing three-stage dimming LED control circuit figure;
Fig. 7 is three-stage dimming LED control circuit figure of the present invention.
Embodiment
Three-stage dimming incandescent lamp as traditional in Fig. 3-5 is at three kinds of luminous flux schematic diagrames, Fig. 6 is the circuit diagram that existing three-stage dimming LED two-way power supply realizes controlling, two-way constant-current control circuit controls two paths of LED lamp, principle is the same with conventional incandescent, by the selected required luminous flux of switch, two segment filament two-way constant-current control circuits originally add two paths of LED lamp and replace.
The present invention adopts a set of main circuit work, at AC, two signal deteching circuits are set, two-way detection signal controls corresponding operating circuit respectively, control at the elementary LED output current that realizes of power supply, circuit can be applicable to step-down constant current non-isolated circuit, also can be applicable to flyback isolation constant-current circuit and boosting non-isolated constant-current circuit; Circuit current constant control, in primary side, has current sense resistor, detects resistance and feeds back to control IC in voltage signal mode, realizes changing output current.
Circuit has 2 key points, and the first, detection signal on 2 tunnels exchange.The second, utilize the signal detected to change the resistance of electric circuit inspection resistance.
Three-stage dimming LED control circuit figure as shown in Figure 7, circuit front-end is selector switch, when L1 and N two ends switch on power, diode D1 and three the resistance R1 of voltage through connecting of power end, R2, R3 dividing potential drop, the detectable voltage signals between R1 and R2 is transferred to the g pole of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 conducting, R15 is switched to GND.Power supply sends into main circuit through bridge heap BD1 simultaneously, and U1 starts working, and the current controling end CS pin of U1 is by resistance R15 ground connection, and output current is determined by R15 resistance.This LED with
I
1=U
cS÷ R
cS1constant current work, R
cS1for R15 and R17 resistance in parallel, this is first paragraph brightness.
When L2 and N two ends switch on power, L1 and N disconnects, metal-oxide-semiconductor Q1 not conducting, diode D2 and three the resistance R4 of voltage through connecting of power end, R5, R6 dividing potential drop, detectable voltage signals between R4 and R5 is transferred to the g pole of metal-oxide-semiconductor Q2, and metal-oxide-semiconductor Q2 conducting, R16 is switched to GND.Power supply sends into main circuit through bridge heap BD2 simultaneously, and U1 starts working, and the current controling end CS pin of U1 is by resistance R16 ground connection, and output current is determined by R16 resistance.This LED is with I
2=U
cS÷ R
cS2constant current work, R
cS2for R16 and R17 resistance in parallel, this is the brightness of LED second segment.
As L1 and N, L2 and N two-way switches on power simultaneously, then as previously mentioned, R15, R16 be place in circuit simultaneously, and output current is I
3=U
cS÷ R
cS3, R
cS3for R15, R16 and R17 resistance in parallel, this is LED the 3rd section of brightness.
Like this by increasing testing circuit, the current controling end resistance value of adjustment constant current chip U1, only need a major loop, a paths of LEDs lamp, just can complete the work of 3 sections of dimming LED lamps, simplify circuit, reduce cost.
Claims (3)
1. a three-stage dimming LED control circuit, it is characterized in that, comprise three sections of selected on-off circuits, a road rectification circuit, two alignment detection circuits, a road constant-current control circuit and one group of LED, alternating current connects rectification circuit through three sections of selected on-off circuits, constant-current control circuit is outputted to after rectification circuit AC-DC conversion, constant-current control circuit is exported to LED and is powered, three sections of selected on-off circuits export termination two-way testing circuit, and testing circuit exports and connects constant current chip current controling end in constant-current control circuit;
Circuit front-end is selector switch, when L1 and N two ends switch on power, and diode D1 and three the resistance R1 of voltage through connecting of power end, R2, R3 dividing potential drop, the detectable voltage signals between R1 and R2 is transferred to the g pole of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 conducting, R15 is switched to GND; Power supply sends into main circuit through bridge heap BD1 simultaneously, and U1 starts working, and the current controling end CS pin of U1 is by resistance R15 ground connection, and output current is determined by R15 resistance, and this LED is with I
1=U
cS÷ R
cS1constant current work, R
cS1for R15 and R17 resistance in parallel, this is first paragraph brightness;
When three sections of selector switch L2 and N two ends switch on power, L1 and N disconnects, metal-oxide-semiconductor Q1 not conducting, diode D2 and three the series resistance R4 of voltage through connecting of power end, R5, R6 dividing potential drop, the detectable voltage signals between R4 and R5 is transferred to the g pole of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2 conducting, R16 is switched to GND; Power supply sends into main circuit through bridge heap BD2 simultaneously, and constant current chip U1 starts working, and the current controling end CS pin of constant current chip U1 is by resistance R16 ground connection, and output current is determined by R16 resistance, and this LED is with I
2=U
cS÷ R
cS2constant current work, R
cS2for R16 and R17 resistance in parallel, this is the brightness of LED second segment;
As three sections of selector switch L1 and N, L2 and N two-way switches on power simultaneously, then as previously mentioned, R15, R16 be place in circuit simultaneously, and output current is I
3=U
cS÷ R
cS3, R
cS3for R15, R16 and R17 resistance in parallel, this is LED the 3rd section of brightness.
2. three-stage dimming LED control circuit according to claim 1, is characterized in that, described three sections of selected on-off circuits export two-way alternating current, wherein two sections of output two-way roads wherein that conducting is corresponding respectively, and the 3rd section be connect output two-way simultaneously.
3. three-stage dimming LED control circuit according to claim 2, it is characterized in that, described two alignment detection circuits connect three sections of selected on-off circuit two-way outputs respectively, every alignment detection circuit comprises diode, sampling resistor, metal-oxide-semiconductor and feedback resistance, three sections of selected on-off circuit output AC electricity pass through diode and the sampling resistor ground connection of corresponding testing circuit series connection, sampling resistor powers on force feed metal-oxide-semiconductor control end, metal-oxide-semiconductor conducting, feedback resistance access constant current chip current controling end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310283106.2A CN103313490B (en) | 2013-07-08 | 2013-07-08 | Control circuit of three-way dimming LED (light-emitting diode) lights |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310283106.2A CN103313490B (en) | 2013-07-08 | 2013-07-08 | Control circuit of three-way dimming LED (light-emitting diode) lights |
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| CN103313490A CN103313490A (en) | 2013-09-18 |
| CN103313490B true CN103313490B (en) | 2015-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310283106.2A Active CN103313490B (en) | 2013-07-08 | 2013-07-08 | Control circuit of three-way dimming LED (light-emitting diode) lights |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429444A (en) * | 2015-11-20 | 2016-03-23 | 芜湖锐芯电子科技有限公司 | Alternating-current and direct-current automatic conversion circuit |
| CN106028500B (en) * | 2016-05-18 | 2018-05-18 | 厦门佰明光电股份有限公司 | A kind of adjustable three-stage LED light control circuit of output |
| CN106211449B (en) * | 2016-07-22 | 2018-06-29 | 上海顿格电子贸易有限公司 | A kind of circuit of LED of three-stage dimming |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695351A (en) * | 2012-05-21 | 2012-09-26 | 上海阿卡得电子有限公司 | Forming circuit of three-section dimming control signals of fluorescent lamp ballast |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5233904B2 (en) * | 2009-08-18 | 2013-07-10 | サンケン電気株式会社 | LED drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695351A (en) * | 2012-05-21 | 2012-09-26 | 上海阿卡得电子有限公司 | Forming circuit of three-section dimming control signals of fluorescent lamp ballast |
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| CN103313490A (en) | 2013-09-18 |
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Address after: Room 1534, No. 498 GuoShoujing Road, Pudong Software Park, Pudong New Area, Shanghai, 201203 Patentee after: Kotya lighting (Shanghai) Co.,Ltd. Address before: 201203 Shanghai city Pudong New Area GuoShouJing No. 498 Pudong Software Park Building 1, room 1534 Patentee before: Shanghai Dunge Electronic Trading Co.,Ltd. |
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Effective date of registration: 20220309 Address after: 518000 605 bixinyuan, Futian District, Shenzhen, Guangdong Patentee after: Wu Guangmin Address before: Room 1534, building 1, Pudong Software Park, 498 GuoShouJing Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 201203 Patentee before: Kotya lighting (Shanghai) Co.,Ltd. |
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