CN202818711U - AC-DC isolation primary side control LED constant current power supply circuit capable of simulating dimming - Google Patents
AC-DC isolation primary side control LED constant current power supply circuit capable of simulating dimming Download PDFInfo
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- CN202818711U CN202818711U CN 201220454209 CN201220454209U CN202818711U CN 202818711 U CN202818711 U CN 202818711U CN 201220454209 CN201220454209 CN 201220454209 CN 201220454209 U CN201220454209 U CN 201220454209U CN 202818711 U CN202818711 U CN 202818711U
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Abstract
The utility model relates to the technical field of LED (Light Emitting Diode) illumination, and especially relates to an AC-DC (Alternating Current-Direct Current) isolation primary side control LED constant current power supply circuit capable of simulating dimming, comprising a first rectification filter circuit, a voltage transformation circuit, and a second rectification filter circuit; wherein an input end of the first rectification filter circuit is connected with an AC input end, an output end of the first rectification filter circuit is connected with an input end of the voltage transformation circuit, an input end of the second rectification filter circuit is connected with an output end of the voltage transformation circuit, an output end of the second rectification filter circuit is connected with an output end of the whole circuit; and the AC-DC isolation primary side control LED constant current power supply circuit also comprises a dimming circuit which is connected with the voltage transformation circuit. The AC-DC isolation primary side control LED constant current power supply circuit capable of simulating dimming provided by the utility model has the advantages of simple structure, low cost, high reliability, capacity for performing dimming according to needs, and very convenient use.
Description
Technical field
The utility model relates to the LED lighting technical field, relates in particular to the former limit control LED constant-current power supply circuit that a kind of AC-DC isolation can be simulated light modulation.
Background technology
Along with the rise of LED green lighting technique, AC-DC isolation drive LED constant-current power supply circuit becomes crucial requirement, and it drives control IC(is control chip) also constantly weed out the old and bring forth the new.We know LED conducting voltage substantially constant, need the power supply of a current constant to light, namely be operated under the constant current mode, current constant, power or brightness are also substantially constant, and therefore the constant-current supply of a superior performance becomes and is even more important.The LED driving constant-current power is divided into isolation and non-isolation.In the LED power drives mode of isolation, obtain output current and information of voltage is added on the pin of IC by feedback circuit, through the internal circuit analysis and control, reach the purpose of constant output current.
According to the difference of obtaining the feedback current information of voltage, AC-DC isolation LED constant-current driving power supply circuit (the following constant-current circuit that also is called for short) can be divided into elementary feedback and secondary feedback.Elementary (former limit) feedback form mainly is the voltage waveform that obtains work from the auxiliary winding of transformer, the Ton of its waveform by analysis, Toff, Vfb voltage etc. obtains output voltage information, obtain primary current information in conjunction with current sampling resistor, controlling internal circuit operates again, voltage waveform on its feedback winding is to exchange dynamically, for the transmitting energy that obtains accurate each cycle calculates output current information, its working method is in DCM(discontinuous current pattern basically) or CRM(electric current critical conduction mode).Elementary feedback has the difference of minute built-in power pipe and external power tube.Referring to Fig. 3, OB2532 is the power supply control IC of external power switch pipe MOS.
As shown in Figure 4, secondary (secondary) feedback constant current circuit mainly is to obtain the output current information of voltage from output through output current sample resistance and voltage detecting circuit, by the isolation of the feedback circuits such as light lotus root and driving, signal feedback to the pin of former limit control IC, is reached the purpose of control output current and voltage.Present secondary feedback LED constant current drive IC is also divided built-in switch power tube and external switch power tube.
Along with popularizing gradually of LED illumination, the dimming power source of brightness-adjustable also becomes many users' demand, but it needs the continually varying output current to control the brightness of continually varying lamp.
Existing constant-current supply drives the application that control IC is difficult to directly be used for doing the isolation tunable optical.Former because: the driving of elementary (former limit) feedback, basically all be operated in interrupted or critical conduction mode, do not have special pin to be used for connecting in check analog DC voltage signal, to reach the purpose of adjusting output current.And the constant current control of secondary (secondary) feedback, circuit itself is comparatively complicated, and it is higher to increase the DC control circuit cost again, and reliability is low.And the IC of special-purpose AC-DC thyristor regulating photoelectric source is complicated owing to circuit, and bad adaptability go back at present little maturation, and cost is higher.
The utility model content
The purpose of this utility model is for the technical problem that will solve, provide a kind of AC-DC isolation can simulate the former limit control LED constant-current power supply circuit of light modulation, this circuit structure is simple, cost is lower, reliability is high, as required light modulation, and is very easy to use.
A kind of AC-DC isolation can be simulated the former limit control LED constant-current power supply circuit of light modulation, comprise the first current rectifying and wave filtering circuit, transforming circuit and the second current rectifying and wave filtering circuit, the input of described the first current rectifying and wave filtering circuit is connected with the alternating current input, the output of the first current rectifying and wave filtering circuit is connected with the input of transforming circuit, the input of the second current rectifying and wave filtering circuit is connected with the output of transforming circuit, the output of the second current rectifying and wave filtering circuit is connected with the output of whole circuit, also comprise light adjusting circuit, described light adjusting circuit is connected with transforming circuit.
Wherein, described light adjusting circuit comprises resistance R 9, R10, R11, capacitor C 6, diode D4, D5, triode Q2, the end of described R10, the end of R11 are connected with the controller of transforming circuit respectively, the other end of R10 is connected with the positive pole of D4, the positive pole of D5 respectively, the other end of R11 is connected with the negative pole of D5, the negative pole of D4 is connected with the end of C6, the emitter of Q2 respectively, the other end of C6, the collector electrode of Q2 be ground connection respectively, the end of R9 is connected with the base stage of Q2, and the other end of R9 is connected with the direct voltage Dim signal that external circuits provides.
Wherein, described the first current rectifying and wave filtering circuit is full-bridge rectification filter circuit.
Wherein, described full-bridge rectification filter circuit comprises fuse F1, rectifier bridge BD1, capacitor C 1, the end of described F1 is connected with live wire, the other end of F1 is connected with the 1st pin of rectifier bridge, the 2nd pin of rectifier bridge is connected with the positive pole of C1, the 3rd pin of rectifier bridge is connected with zero line, and the 4th pin of rectifier bridge, the negative pole of C1 be ground connection respectively.
Wherein, described transforming circuit comprises control chip U1, transformer T1, resistance R 2, R3, R4, R5, R6, R7, R8, capacitor C 2, C3, C4, diode D1, D2, switching tube Q1, described U1 is OB2532, the end of R2, the end of R4, the end of C4, one end of the primary coil of T1 respectively with the positive pole of the C1 of full-bridge rectification filter circuit, the 2nd pin of BD1 connects, the other end of R2 is connected with the end of R3, the other end of the primary coil of T1 respectively with the grid of Q1, the positive pole of D2 connects, the negative pole of D2 respectively with the other end of R4, the other end of C4 connects, the secondary coil of T1 is connected with the input of the second current rectifying and wave filtering circuit, one end of the auxiliary winding of T1 respectively with the positive pole of D1, the end of R5 connects, the other end ground connection of the auxiliary winding of T1, the source electrode of Q1 respectively with the end of R7, the end of R8 connects, the 2nd pin of U1 respectively with the other end of R10, the drain electrode of Q1 connects, the 3rd pin of U1 respectively with the other end of R8, the other end of R11 connects, the 4th pin of U1 respectively with the other end of R5, the end of R6 connects, the 5th pin of U1 is connected with the end of C3, the 6th pin of U1 respectively with the other end of R3, the negative pole of D1, the end of C2 connects, the 1st pin of U1, the other end of C2, the other end of C3, the other end of R6, the other end of R7 is ground connection respectively.
Wherein, described the second current rectifying and wave filtering circuit comprises capacitor C 5 and diode D3, the positive pole of D3 is connected with an end of the secondary coil of T1, the negative pole of D3 is connected with the positive pole of the output of the positive pole of C5, whole circuit respectively, and the other end of the negative pole of C5, the secondary coil of T1 is connected with the negative pole of the output of whole circuit.
The beneficial effects of the utility model are:
The former limit control LED constant-current power supply circuit of the utility model AC-DC isolation tunable optical uses existing AC-DC isolation LED constant-current driving power supply IC as the basis, add simple peripheral components, just can be on former limit (elementary IC control side) realize adjusting the purpose of output current with the analog DC voltage signal; This circuit structure is simple, cost is lower, precision is higher, reliability is higher, (can be used as the remote control controls such as single-chip microcomputer) very easy to use.
Description of drawings
Fig. 1 is the modular structure figure that AC-DC isolation of the present utility model can be simulated the former limit control LED constant-current power supply circuit of light modulation.
Fig. 2 is the circuit diagram that AC-DC isolation of the present utility model can be simulated the former limit control LED constant-current power supply circuit of light modulation.
Fig. 3 is the circuit diagram without the former limit control LED constant-current power supply circuit of light modulation of prior art.
Fig. 4 is that the another kind of prior art is without the circuit diagram of the former limit control LED constant-current power supply circuit of light modulation.
The 1-the first current rectifying and wave filtering circuit; 2-transforming circuit;
The 3-the second current rectifying and wave filtering circuit; 4-light adjusting circuit.
Embodiment
For the purpose, technical scheme and the advantage that make utility model is clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.
As depicted in figs. 1 and 2, a kind of AC-DC isolation can be simulated the former limit control LED constant-current power supply circuit of light modulation, comprise the first current rectifying and wave filtering circuit 1, transforming circuit 2 and the second current rectifying and wave filtering circuit 3, the input of described the first current rectifying and wave filtering circuit 1 is connected with the alternating current input, the output of the first current rectifying and wave filtering circuit 1 is connected with the input of transforming circuit 2, the input of the second current rectifying and wave filtering circuit 3 is connected with the output of transforming circuit 2, the output of the second current rectifying and wave filtering circuit 3 is connected with the output of whole circuit, also comprise light adjusting circuit 4, described light adjusting circuit 4 is connected with transforming circuit 2.
Wherein, described light adjusting circuit 4 comprises resistance R 9, R10, R11, capacitor C 6, diode D4, D5, triode Q2, the end of described R10, the end of R11 are connected with the controller of transforming circuit 2 respectively, the other end of R10 is connected with the positive pole of D4, the positive pole of D5 respectively, the other end of R11 is connected with the negative pole of D5, the negative pole of D4 is connected with the end of C6, the emitter of Q2 respectively, the other end of C6, the collector electrode of Q2 be ground connection respectively, the end of R9 is connected with the base stage of Q2, and the other end of R9 is connected with the direct voltage Dim signal that external circuits provides.
Wherein, described the first current rectifying and wave filtering circuit 1 is full-bridge rectification filter circuit.
Wherein, described full-bridge rectification filter circuit comprises fuse F1, rectifier bridge BD1, capacitor C 1, the end of described F1 is connected with live wire, the other end of F1 is connected with the 1st pin of rectifier bridge, the 2nd pin of rectifier bridge is connected with the positive pole of C1, the 3rd pin of rectifier bridge is connected with zero line, and the 4th pin of rectifier bridge, the negative pole of C1 be ground connection respectively.
Wherein, described transforming circuit 2 comprises control chip U1, transformer T1, resistance R 2, R3, R4, R5, R6, R7, R8, capacitor C 2, C3, C4, diode D1, D2, switching tube Q1, described U1 is OB2532, the end of R2, the end of R4, the end of C4, one end of the primary coil of T1 respectively with the positive pole of the C1 of full-bridge rectification filter circuit, the 2nd pin of BD1 connects, the other end of R2 is connected with the end of R3, the other end of the primary coil of T1 respectively with the grid of Q1, the positive pole of D2 connects, the negative pole of D2 respectively with the other end of R4, the other end of C4 connects, the secondary coil of T1 is connected with the input of the second current rectifying and wave filtering circuit 3, one end of the auxiliary winding of T1 respectively with the positive pole of D1, the end of R5 connects, the other end ground connection of the auxiliary winding of T1, the source electrode of Q1 respectively with the end of R7, the end of R8 connects, the 2nd pin of U1 respectively with the other end of R10, the drain electrode of Q1 connects, the 3rd pin of U1 respectively with the other end of R8, the other end of R11 connects, the 4th pin of U1 respectively with the other end of R5, the end of R6 connects, the 5th pin of U1 is connected with the end of C3, the 6th pin of U1 respectively with the other end of R3, the negative pole of D1, the end of C2 connects, the 1st pin of U1, the other end of C2, the other end of C3, the other end of R6, the other end of R7 is ground connection respectively.
Wherein, described the second current rectifying and wave filtering circuit 3 comprises capacitor C 5 and diode D3, the positive pole of D3 is connected with an end of the secondary coil of T1, the negative pole of D3 is connected with the positive pole of the output of the positive pole of C5, whole circuit respectively, and the other end of the negative pole of C5, the secondary coil of T1 is connected with the negative pole of the output of whole circuit.
The full-bridge rectification filter circuit that input ac power consists of by F1, BD1, C1; U1 is OB2532, belongs to the constant current constant voltage IC of former limit control; R2, R3, C2 are that the 6th pin (being the VDD pin) of U1 provides starting current; PIN1(the 1st pin of U1) ground connection; PIN2(the 2nd pin of U1) for driving GATE, outside connected switch pipe Q1, the turn-on and turn-off of control transformer primary coil; The PIN3 pin of U1 (the 3rd pin) is the current detecting pin CS in the former limit of transformer T1 (also being switching tube Q1) each cycle, it obtains current signal by external current sense resistor R7, be added on the pin by R8, because circuit working is at non-continuous mode, the voltage of CS is namely discrete, can control the maximum constant current point of output by adjusting the R7 size; The PIN4 pin of U1 (the 4th pin) is for connecing the feedback voltage pin of the auxiliary winding of transformer, and the voltage of drawing from transformer is added on the PIN4 pin by R5, R6 dividing potential drop, reflects output voltage size and the per cycle transformer situation that releases energy; The PIN5 pin of U1 (the 5th pin) is the error amplifier output pin, is used for loop compensation; The PIN6 pin of U1 (the 6th pin) connects the auxiliary winding of transformer by D1 and keeps voltage for VDD provides power supply.
D2, R4, C4 consist of the RCD absorbing circuit, the due to voltage spikes that its leakage inductance produces during instead swashing for absorption transformer T1, protection switch pipe Q1; Output circuit connects D3, C5 rectifying and wave-filtering by transformer output winding.Circuit by as shown in Figure 2 can maintain input voltage in the scope of AC85-265V, and output keeps the output current of a 4-10V/300mA to come the driving LED lamp.
Light adjusting circuit 4 so that output current can regulate, the direct voltage Dim signal (0-1.8V) that is provided by other circuit is added on the ground level b of Q2 by R9, Q2 is the positive-negative-positive triode, and its current collection level c ground connection obtains a voltage (than the high about 0.6V of ground level b) of following ground level b at emitting stage e.Emitting stage e(is with C point in the circuit) the GATE signal that provided by the PIN2 pin of U1 of power supply, through R10, R11, D5 dividing potential drop, obtain one and the synchronous pulse square wave of GATE at the A point, by D4, C6 rectifying and wave-filtering, obtain direct voltage, because C point direct voltage controls by Dim, so the A pulse square wave peak value of ordering by clamped within C point direct voltage adds D4 forward voltage (about 0.5V); The A point voltage is through behind the D5 simultaneously, by R11, R8, the pulse square wave that the R7 dividing potential drop obtains, be superimposed with triangle wave voltage that the linear triangular current that increases of Q1 (transformer primary side) obtains by the R7 sampling (with GATE, the square-wave voltage homophase that B is ordered), because the voltage that B is ordered detects as the CS of U1, its peak value (namely two voltage sums) is limited in 1V, if the square wave crest voltage that dividing potential drop obtains on the B point is high, then triangle wave voltage just reduces, namely primary current just reduces, output current reduces, otherwise the square-wave voltage value is little, triangle wave voltage just increases, primary current just increases, and output current increases, and has so just reached the regulation output electric current, the purpose of control LED brightness.
The former limit feedback LED power circuit of the utility model AC-DC isolation tunable optical uses existing AC-DC isolation LED constant-current driving power supply IC as the basis, add simple peripheral components, just can be on former limit (elementary IC control side) realize adjusting the purpose of output current with the analog DC voltage signal; This circuit structure is simple, cost is lower, precision is higher, reliability is higher, (can be used as the remote control controls such as single-chip microcomputer) very easy to use.
Above content only is preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (6)
1. an AC-DC isolates the former limit control LED constant-current power supply circuit that can simulate light modulation, comprise the first current rectifying and wave filtering circuit, transforming circuit and the second current rectifying and wave filtering circuit, the input of described the first current rectifying and wave filtering circuit is connected with the alternating current input, the output of the first current rectifying and wave filtering circuit is connected with the input of transforming circuit, the input of the second current rectifying and wave filtering circuit is connected with the output of transforming circuit, the output of the second current rectifying and wave filtering circuit is connected with the output of whole circuit, it is characterized in that: also comprise light adjusting circuit, described light adjusting circuit is connected with transforming circuit.
2. a kind of AC-DC isolation according to claim 1 can be simulated the former limit control LED constant-current power supply circuit of light modulation, it is characterized in that: described light adjusting circuit comprises resistance R 9, R10, R11, capacitor C 6, diode D4, D5, triode Q2, the end of described R10, the end of R11 is connected with the controller of transforming circuit respectively, the other end of R10 respectively with the positive pole of D4, the positive pole of D5 connects, the other end of R11 is connected with the negative pole of D5, the negative pole of D4 respectively with the end of C6, the emitter of Q2 connects, the other end of C6, the collector electrode of Q2 is ground connection respectively, the end of R9 is connected with the base stage of Q2, and the other end of R9 is connected with the direct voltage Dim signal that external circuits provides.
3. a kind of AC-DC isolation according to claim 2 can be simulated the former limit control LED constant-current power supply circuit of light modulation, and it is characterized in that: described the first current rectifying and wave filtering circuit is full-bridge rectification filter circuit.
4. a kind of AC-DC isolation according to claim 3 can be simulated the former limit control LED constant-current power supply circuit of light modulation, it is characterized in that: described full-bridge rectification filter circuit comprises fuse F1, rectifier bridge BD1, capacitor C 1, the end of described F1 is connected with live wire, the other end of F1 is connected with the 1st pin of rectifier bridge, the 2nd pin of rectifier bridge is connected with the positive pole of C1, the 3rd pin of rectifier bridge is connected with zero line, and the 4th pin of rectifier bridge, the negative pole of C1 be ground connection respectively.
5. a kind of AC-DC isolation according to claim 4 can be simulated the former limit control LED constant-current power supply circuit of light modulation, it is characterized in that: described transforming circuit comprises control chip U1, transformer T1, resistance R 2, R3, R4, R5, R6, R7, R8, capacitor C 2, C3, C4, diode D1, D2, switching tube Q1, described U1 is OB2532, the end of R2, the end of R4, the end of C4, one end of the primary coil of T1 is connected with the 2nd pin of the BD1 of full-bridge rectification filter circuit respectively, the other end of R2 is connected with the end of R3, the other end of the primary coil of T1 respectively with the grid of Q1, the positive pole of D2 connects, the negative pole of D2 respectively with the other end of R4, the other end of C4 connects, the secondary coil of T1 is connected with the input of the second current rectifying and wave filtering circuit, one end of the auxiliary winding of T1 respectively with the positive pole of D1, the end of R5 connects, the other end ground connection of the auxiliary winding of T1, the source electrode of Q1 respectively with the end of R7, the end of R8 connects, the 2nd pin of U1 respectively with the other end of R10, the drain electrode of Q1 connects, the 3rd pin of U1 respectively with the other end of R8, the other end of R11 connects, the 4th pin of U1 respectively with the other end of R5, the end of R6 connects, the 5th pin of U1 is connected with the end of C3, the 6th pin of U1 respectively with the other end of R3, the negative pole of D1, the end of C2 connects, the 1st pin of U1, the other end of C2, the other end of C3, the other end of R6, the other end of R7 is ground connection respectively.
6. a kind of AC-DC isolation according to claim 5 can be simulated the former limit control LED constant-current power supply circuit of light modulation, it is characterized in that: described the second current rectifying and wave filtering circuit comprises capacitor C 5 and diode D3, the positive pole of D3 is connected with an end of the secondary coil of T1, the negative pole of D3 is connected with the positive pole of the output of the positive pole of C5, whole circuit respectively, and the other end of the negative pole of C5, the secondary coil of T1 is connected with the negative pole of the output of whole circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220454209 CN202818711U (en) | 2012-09-07 | 2012-09-07 | AC-DC isolation primary side control LED constant current power supply circuit capable of simulating dimming |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220454209 CN202818711U (en) | 2012-09-07 | 2012-09-07 | AC-DC isolation primary side control LED constant current power supply circuit capable of simulating dimming |
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| CN 201220454209 Expired - Fee Related CN202818711U (en) | 2012-09-07 | 2012-09-07 | AC-DC isolation primary side control LED constant current power supply circuit capable of simulating dimming |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159379A (en) * | 2014-08-28 | 2014-11-19 | 佛山冠今光电科技有限公司 | Driving power source for smart LED bulb |
| CN107094338A (en) * | 2017-06-30 | 2017-08-25 | 湖州灵感电子科技有限公司 | A kind of constant current driver circuit for LED |
-
2012
- 2012-09-07 CN CN 201220454209 patent/CN202818711U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159379A (en) * | 2014-08-28 | 2014-11-19 | 佛山冠今光电科技有限公司 | Driving power source for smart LED bulb |
| CN104159379B (en) * | 2014-08-28 | 2017-02-01 | 佛山冠今光电科技有限公司 | Driving power source for smart LED bulb |
| CN107094338A (en) * | 2017-06-30 | 2017-08-25 | 湖州灵感电子科技有限公司 | A kind of constant current driver circuit for LED |
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Granted publication date: 20130320 Termination date: 20170907 |