CN201910958U - Multi-channel constant-current light emitting diode (LED) lamp drive circuit - Google Patents
Multi-channel constant-current light emitting diode (LED) lamp drive circuit Download PDFInfo
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- CN201910958U CN201910958U CN2010206816167U CN201020681616U CN201910958U CN 201910958 U CN201910958 U CN 201910958U CN 2010206816167 U CN2010206816167 U CN 2010206816167U CN 201020681616 U CN201020681616 U CN 201020681616U CN 201910958 U CN201910958 U CN 201910958U
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Abstract
The utility model discloses a multi-channel constant-current light emitting diode (LED) lamp drive circuit, which comprises a rectifier filter circuit, a power factor correction (PFC) circuit and DC-DC conversion circuits. Each DC-DC conversion circuit comprises a DC-DC conversion circuit controller, a primary winding which is connected with an input circuit, a secondary winding which is connected with an output circuit, and a feedback winding which is connected with the control circuit of the DC-DC conversion circuit controller. Compared with the prior art, since the DC-DC conversion circuits of the multi-channel constant-current LED lamp drive circuit are independent to each other, mutual influence can be reduced and the extensibility of the LED drive circuit can be improved; and since the input bus bar of a DC-DC input circuit is shared, the consistency of multi-channel constant-current output is facilitated. Therefore, the multi-channel constant-current LED lamp drive circuit has the advantages that the number of component can be reduced, production cost is decreased and the stability and the performance of the circuit are improved.
Description
Technical field
The utility model relates to a kind of led circuit, relates in particular to a kind of LED lamp drive circuit of multiple constant current.
Background technology
Illumination has accounted for 20% in global Energy Consumption, and the illuminating product of the energy-efficient and environmentally safe of develop and spread is significant to protection environment, energy savings.
Along with the widespread usage of LED in light decoration, general lighting and automobile LED floor light, it is more and more important that led drive circuit seems.LED is as a kind of light emitting semiconductor device of current mode, and its luminous intensity is determined by the electric current that flows through LED, so driving LED needs constant-current supply.Existing led drive circuit adopts pulse width modulating technology (PWM) mostly, obtains the sampling feedback signal from the circuit output and carries out the constant current compensation, obtains constant current output.The LED lamp also adopts man-to-man mode activated LED work mostly.This LED lamp because a lamp just needs a drive circuit, has improved the production application cost of LED lamp at some illumination occasion such as sales field, underground garage etc. greatly, is unfavorable for the popularization and the development of LED integral body.
The utility model content
The purpose of this utility model provide a kind of low cost, high efficiency, simple in structure, reliability is high and extendible multiple constant current LED lamp drive circuit.
For reaching aforementioned purpose, the utility model adopts following technical scheme: a kind of multiple constant current LED lamp drive circuit comprises current rectifying and wave filtering circuit, circuit of power factor correction (pfc circuit) and DC-DC translation circuit.Described DC-DC translation circuit comprises DC-DC translation circuit controller, elementary winding, the secondary winding that is connected with output circuit that is connected with input circuit and the feedback winding that connects DC-DC translation circuit controller controling circuit.
As further improvement of the utility model, the inlet highway of described elementary winding one termination DC-DC translation circuit, meet current sense resistor R ' sense by low-impedance switching tube simultaneously, the detection electric current is provided for DC-DC translation circuit controller, the described elementary winding other end is by low-impedance switching tube ground connection.
As further improvement of the utility model, described feedback winding connects voltage detection signal, detection voltage is provided for the controller of DC-DC translation circuit.
As further improvement of the utility model, described secondary winding connects led module by output filter circuit.
As further improvement of the utility model, described pfc circuit comprise the PFC transformer that connects the current rectifying and wave filtering circuit high-voltage output end, by detect Rsense go up voltage control output to DC-DC translation circuit inlet highway input current pfc controller and be connected to the low-impedance switching tube of DC-DC translation circuit inlet highway.
As further improvement of the utility model, pfc circuit also comprises the zero passage detection resistance R
ZCDWith diode VD, the zero passage detection resistance R
ZCDThe zero current detection pin that connects pfc controller, with the conducting or the shutoff of control low-impedance switching tube, diode VD connects the VCC pin of pfc controller, powers to pfc controller.
Compared to prior art, the utility model multiple constant current LED lamp drive circuit can reduce component number, reduces production costs, and improves the stability and the performance of circuit.The independence of DC-DC translation circuit can reduce mutual influence, improves the autgmentability of led drive circuit, and the inlet highway of shared DC-DC input circuit is beneficial to the consistency of multiple constant current output.
Description of drawings
Fig. 1 is the utility model multiple constant current LED lamp drive circuit block diagram.
Fig. 2 is the pfc circuit figure of the utility model multiple constant current LED lamp drive circuit.
Fig. 3 is the DC-DC translation circuit figure of the utility model multiple constant current LED lamp drive circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in detail below in conjunction with the drawings and specific embodiments.
See also shown in Figure 1, the utility model multiple constant current LED lamp drive circuit structure comprises the DC-DC translation circuit 40 of EMC filter circuit 10, current rectifying and wave filtering circuit 20, circuit of power factor correction (pfc circuit) 30, a plurality of parallel connections, and the output rectification circuit 50 that is connected in DC-DC translation circuit 40.Each DC-DC translation circuit 40 is connected to single led module 60 at last.Led module 60 can be one, also can represent the quantity of LED load blocks 60 among Fig. 1 with N for more than two and two.Certainly, led module 60 also can be designed to a plurality of series connection or parallel connection is connected to DC-DC translation circuit 40 as required.
See also shown in Figure 2, the high-voltage output end of the A termination current rectifying and wave filtering circuit 20 of PFC transformer 31 among the pfc circuit figure; The inlet highway 41 of B termination DC-DC translation circuit 40 connects current sense resistor by low-impedance switching tube 32 simultaneously, and pfc controller detects the voltage of current sense resistor Rsense33, the input current on the control output DC-DC translation circuit inlet highway 41; The C end is by the zero passage detection resistance R
ZCD34 connect the zero current detection pin of pfc controller 35, the conducting or the shutoff of control low-impedance switching tube by the VCC pin of diode VD1 connection pfc controller 35, are powered to pfc controller simultaneously, avoid transformer power taking from the level DC-DC translation circuit of back, influence the precision of multiple constant current.
See also shown in Figure 3ly, A'B' is elementary winding in the DC-DC translation circuit 40, connects input circuit; C'D' is the feedback winding, connects the control circuit of DC-DC translation circuit controller 42; E'F' is a secondary winding, connects output circuit.Wherein A' connects the inlet highway 41 of DC-DC translation circuit, meets current sense resistor R'sense44 by low-impedance switching tube 43 simultaneously, the detection electric current is provided for DC-DC translation circuit controller 42; The B' end is by low-impedance switching tube 45 ground connection; The indirect divider resistance of C'D', detection signal is pressed in power taking, detection voltage is provided for the controller 42 of DC-DC translation circuit 40; The E' end connects led module 60 by output filter circuit 50.DC-DC controller 42 makes E' end output constant current by the electric current that detects on the DC-DC translation circuit inlet highway 41; Make E' end output burning voltage by the output voltage that detects the feedback winding.The primary side current detecting is compared output feedback commonly used at present with feedback side voltage detecting, can reduce component number, reduces production costs, and improves the stability and and the performance of circuit.The independence of DC-DC translation circuit can reduce mutual influence, improves the autgmentability of led drive circuit; The inlet highway of shared DC-DC input circuit is beneficial to the consistency of multiple constant current output.
In sum, it below only is preferred embodiment of the present utility model, should not limit scope of the present utility model with this, be that every simple equivalent of being done according to the utility model claims and utility model description changes and modifies, all should still belong in the scope that the utility model patent contains.
Claims (6)
1. multiple constant current LED lamp drive circuit, comprise current rectifying and wave filtering circuit, circuit of power factor correction (pfc circuit) and DC-DC translation circuit, it is characterized in that: described DC-DC translation circuit comprises DC-DC translation circuit controller, the elementary winding that is connected with input circuit, the secondary winding that is connected with output circuit and the feedback winding that connects DC-DC translation circuit controller controling circuit.
2. multiple constant current LED lamp drive circuit as claimed in claim 1, it is characterized in that: the inlet highway of described elementary winding one termination DC-DC translation circuit, meet current sense resistor R'sense by low-impedance switching tube simultaneously, the detection electric current is provided for DC-DC translation circuit controller, the described elementary winding other end is by low-impedance switching tube ground connection.
3. multiple constant current LED lamp drive circuit as claimed in claim 2 is characterized in that: described feedback winding connects voltage detection signal, detection voltage is provided for the controller of described DC-DC translation circuit.
4. multiple constant current LED lamp drive circuit as claimed in claim 3, it is characterized in that: described secondary winding connects led module by output filter circuit.
5. multiple constant current LED lamp drive circuit as claimed in claim 1 is characterized in that: described pfc circuit comprise the PFC transformer that connects the current rectifying and wave filtering circuit high-voltage output end, by detect Rsense go up voltage control output to DC-DC translation circuit inlet highway input current pfc controller and be connected to the low-impedance switching tube of DC-DC translation circuit inlet highway.
6. multiple constant current LED lamp drive circuit as claimed in claim 5, it is characterized in that: pfc circuit also comprises the zero passage detection resistance R
ZCDWith diode VD, the zero passage detection resistance R
ZCDThe zero current detection pin that connects pfc controller, with the conducting or the shutoff of control low-impedance switching tube, diode VD connects the VCC pin of pfc controller, powers to pfc controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206816167U CN201910958U (en) | 2010-12-27 | 2010-12-27 | Multi-channel constant-current light emitting diode (LED) lamp drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206816167U CN201910958U (en) | 2010-12-27 | 2010-12-27 | Multi-channel constant-current light emitting diode (LED) lamp drive circuit |
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| Publication Number | Publication Date |
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| CN201910958U true CN201910958U (en) | 2011-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206816167U Expired - Fee Related CN201910958U (en) | 2010-12-27 | 2010-12-27 | Multi-channel constant-current light emitting diode (LED) lamp drive circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510614A (en) * | 2011-10-25 | 2012-06-20 | 上海大学 | LED (light-emitting diode) multi-lamp distributed group drive system |
| CN102548099A (en) * | 2010-12-27 | 2012-07-04 | 苏州盟泰励宝光电有限公司 | Multi-path constant-current LED (Light-Emitting Diode) lamp driving circuit |
| CN102811535A (en) * | 2012-06-28 | 2012-12-05 | 深圳市舜田电源技术有限公司 | Ultrahigh-efficiency LED (Light-Emitting Diode) constant-current power supply based on single-stage conversion and controllable rectification |
| CN103313456A (en) * | 2012-03-07 | 2013-09-18 | 苏州盟泰励宝光电有限公司 | LED driving power supply for motor train unit |
-
2010
- 2010-12-27 CN CN2010206816167U patent/CN201910958U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102548099A (en) * | 2010-12-27 | 2012-07-04 | 苏州盟泰励宝光电有限公司 | Multi-path constant-current LED (Light-Emitting Diode) lamp driving circuit |
| CN102510614A (en) * | 2011-10-25 | 2012-06-20 | 上海大学 | LED (light-emitting diode) multi-lamp distributed group drive system |
| CN103313456A (en) * | 2012-03-07 | 2013-09-18 | 苏州盟泰励宝光电有限公司 | LED driving power supply for motor train unit |
| CN102811535A (en) * | 2012-06-28 | 2012-12-05 | 深圳市舜田电源技术有限公司 | Ultrahigh-efficiency LED (Light-Emitting Diode) constant-current power supply based on single-stage conversion and controllable rectification |
| CN102811535B (en) * | 2012-06-28 | 2018-03-27 | 深圳市舜田电子技术有限公司 | Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110727 Termination date: 20151227 |
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| EXPY | Termination of patent right or utility model |