CN204948393U - The LED drive circuit that a kind of stability is high - Google Patents
The LED drive circuit that a kind of stability is high Download PDFInfo
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- CN204948393U CN204948393U CN201520231180.4U CN201520231180U CN204948393U CN 204948393 U CN204948393 U CN 204948393U CN 201520231180 U CN201520231180 U CN 201520231180U CN 204948393 U CN204948393 U CN 204948393U
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Abstract
The utility model provides the high LED drive circuit of a kind of stability, and secondary current rectifying and wave filtering circuit has circuit of synchronous rectification, and circuit of synchronous rectification realizes based on IR11682 chip.The mode of synchronous rectification is adopted to carry out rectification process to the voltage that LLC translation circuit exports, effectively can improve rectification effect, the quality of drive circuit output current is provided, further, IR11682 chip is adopted to realize synchronous rectification, circuit integrity structure is simple, and required electronic device is few, has effectively saved cost.
Description
Technical field
The utility model relates to LED drive circuit field, the LED drive circuit that particularly a kind of stability is high.
Background technology
LED has energy-saving and environmental protection, life-span length, light efficiency advantages of higher because of it, is used widely at lighting field.In the popularization and application process of LED illumination, because the stability requirement of LED lamp bead to electric current is higher, therefore the special drive circuit of general needs is driven it, but, the design of LED drive circuit but also exists some crucial problem always to be had: (1) driving power efficiency is not high enough, and power factor is also undesirable; (2) on the high side, drive circuit is complicated, and reliability is low.Controlling driving power instability is the main cause causing LED service life reduction.
For this reason, propose in the industry multiple solution, such as, the article that " modern display " has been delivered be entitled as in October, 2011 (total 129 phases) " the HB_LED driving power design based on _ PFC_LLC_CV_CC_ topological structure " namely discloses the complete machine topology design structure of " the superfine rectification+constant current constant voltage of PFC+ half-bridge logical link control (LLC) resonant+Xiao ", this structure obtains widespread adoption due to its high reliability and high stability, but, in circuit disclosed in this article, namely electric current exports load simply by a diode after LLC power conversion, and in practical application, electric current is owing to have passed through the power conversion process of the transformer of LLC translation circuit, a diode is utilized merely to be difficult to play effective rectification, therefore, the stability still Shortcomings of the output current of this circuit.
Summary of the invention
The purpose of this utility model is avoid above-mentioned weak point of the prior art and provide a kind of LED drive circuit that effectively can improve the stability of output current.
The purpose of this utility model is achieved through the following technical solutions:
The LED drive circuit that a kind of stability is high is provided, comprise the pfc circuit, LLC translation circuit and the secondary current rectifying and wave filtering circuit that connect successively, described LLC translation circuit is sent to after the electric current of described pfc circuit to input carries out PFC correction, described LLC translation circuit is delivered to secondary current rectifying and wave filtering circuit after carrying out power conversion to the electric current inputted by PFC, described secondary current rectifying and wave filtering circuit is sent to load after carrying out synchronous rectification to electric current, and described secondary current rectifying and wave filtering circuit realizes based on IR11682 chip.
Concrete, this drive circuit also comprises a current rectifying and wave filtering circuit, inputs in pfc circuit after civil power is transformed to direct current by a described current rectifying and wave filtering circuit.
Concrete, this drive circuit also comprises EMC filter circuit, and described civil power inputs to described prime filter rectifier after EMC filter circuit.
Concrete, this drive circuit also comprises constant pressure and flow regulating circuit, and described constant pressure and flow regulating circuit is sampled from the output of this LED drive circuit and generated conditioning signal and exports LLC translation circuit to.
Wherein, described pfc controller U2 from system power supply end VCC power taking, described LLC controller U1 through delay circuit from system power supply end VCC power taking.
Wherein, described delay circuit comprises switching tube Q20, storage capacitor C4 and is also the charging paths of storage capacitor charging from system power supply end VCC power taking, the collector electrode connected system power end VCC of described switching tube Q2O, emitter connects the power end VDD of LLC controller U1, base stage connects the positive pole of storage capacitor C4, be that storage capacitor C4 charges, until the cathode voltage of storage capacitor C4 triggers described switching tube by charging paths when described system power supply end VCC starts power supply.
Concrete, the auxiliary power circuit that this drive circuit also comprises constant pressure and flow regulating circuit and powers for constant pressure and flow regulating circuit, described constant pressure and flow regulating circuit is sampled from the output of described secondary current rectifying and wave filtering circuit and is combined the outside dim signal inputted and generates, send conditioning signal to described LLC translation circuit, and then regulate the output of described LLC translation circuit, described auxiliary power circuit comprises the first power taking end and the second power taking end, described LLC translation circuit comprises transformer T1, described first power taking end is from the secondary side power taking of described transformer T1, described second power taking end is from the former limit power taking of described transformer T1.
The beneficial effects of the utility model: the utility model provides the high LED drive circuit of a kind of stability, and secondary current rectifying and wave filtering circuit has circuit of synchronous rectification, circuit of synchronous rectification realizes based on IR11682 chip.The mode of synchronous rectification is adopted to carry out rectification process to the voltage that LLC translation circuit exports, effectively can improve rectification effect, the quality of drive circuit output current is provided, further, IR11682 chip is adopted to realize synchronous rectification, circuit integrity structure is simple, and required electronic device is few, has effectively saved cost.
Accompanying drawing explanation
The utility model is described in further detail to utilize accompanying drawing, but the embodiment in accompanying drawing does not form any restriction of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the following drawings.
Fig. 1 is electrical block diagram of the present utility model.
Fig. 2 is pfc circuit of the present utility model and LLC translation circuit structural representation.
Fig. 3 is delay circuit structural representation of the present utility model.
Fig. 4 is auxiliary power circuit structural representation of the present utility model.
Include in Fig. 1 to Fig. 4:
1---EMC filter circuit, 2---current rectifying and wave filtering circuit, 3---pfc circuit, 31---the first power-supply circuit, 32---the second power-supply circuit, 33---the 3rd power-supply circuit, 4---LLC translation circuit, 5---secondary current rectifying and wave filtering circuit, 6---constant pressure and flow regulating circuit, 7---auxiliary power circuits.
Embodiment
With the following Examples the utility model is further described.
The embodiment of the LED drive circuit of the wide dimming scope of the utility model, as shown in Figure 1 and Figure 4, the EMC filter circuit connected successively from input to output 1, current rectifying and wave filtering circuit 2, pfc circuit 3, LLC translation circuit 4 and a secondary current rectifying and wave filtering circuit 5.
Pfc circuit 3 comprises pfc controller U2, switching tube Q17, energy storage inductor L4, diode D2 and output capacitance C39, the input of described energy storage inductor L4 is connected with pfc circuit 3 input, the output of described energy storage inductor is on the one hand through switching tube Q17 ground connection, the output of pfc circuit 3 is connected on the other hand through diode D2, described output capacitance C39 is connected between the output of pfc circuit 3 and power supply ground, described switching tube is conduction and cut-off by described pfc controller controls, U2 is L6563 chip, described pfc controller U2 is from system power supply end VCC power taking, system power supply end VCC through the first power-supply circuit 31 from the power taking of pfc circuit 3 input, through the second power-supply circuit 32 from energy storage inductor L4 power taking, through the former limit power taking of the 3rd power-supply circuit 33 from transformer T1.
The pfc controller U2 of pfc circuit 3 adopts three road power-supply circuits, because the magnitude of voltage of drive circuit each device in the course of the work constantly changes, the phenomenon of undertension is easily there is separately from certain some power taking, cause pfc controller U2 power-off, the present embodiment adopts the different node power taking of ability three then effectively can avoid the problems referred to above.
Described LLC translation circuit 4 comprises transformer T1 and LLC controller U1, and LLC controller U1 is L6599 chip.LLC controller U1 through delay circuit from system power supply end VCC power taking, delay circuit comprises switching tube Q20, storage capacitor C4 and is also the charging paths of storage capacitor charging from system power supply end VCC power taking, the collector electrode connected system power end VCC of described switching tube Q2O, emitter connects the power end VDD of LLC controller U1, base stage connects the positive pole of storage capacitor C4, be that storage capacitor C4 charges, until the cathode voltage of storage capacitor C4 triggers described switching tube by charging paths when described system power supply end VCC starts power supply.
LLC controller U1 through delay circuit from system power supply end VCC power taking, can avoid causing system power supply end VCC undertension from system power supply end VCC power taking at system start-up phase LLC controller U1 and pfc controller U2 simultaneously, therefore LLC controller U1 and the reciprocal power-off of pfc controller U2/power on can not occur and the situation that causes LED to glimmer.
The drive circuit of the present embodiment also comprises constant pressure and flow regulating circuit 6 and the auxiliary power circuit 7 for constant pressure and flow regulating circuit 6 power supply, described constant pressure and flow regulating circuit 6 is sampled from the output of described secondary current rectifying and wave filtering circuit 5 and is combined the outside dim signal inputted and generates, send conditioning signal to described LLC translation circuit 4, and then regulate the output of described LLC translation circuit 4, described auxiliary power circuit 7 comprises the first power taking end and the second power taking end, described first power taking end is from the secondary side power taking of described transformer T1, described second power taking end is from the former limit power taking of described transformer T1.Concrete, the former limit of described transformer T1 is in series with inductance L 5, and described second power taking end is connected with described inductance L 5 with power taking.
In drive circuit works process, when the secondary side voltage of transformer T1 is greater than the supply power voltage of the chip of constant current constant voltage regulating circuit, auxiliary power circuit 7 through the first power taking end from the secondary side power taking of transformer T1 for constant current constant voltage regulating circuit is powered, thus reliable and stable power supply is provided, when the secondary side voltage of transformer T1 is less than the supply power voltage in the chip of constant current constant voltage regulating circuit, auxiliary power circuit 7 through the second power taking end from the former limit limit power taking of transformer T1 to make up the undertension problem of the second power taking end, thus constant current constant voltage regulating circuit still can normally be worked, keep dimming function, therefore, even if this drive circuit is when being adjusted to very little by LED luminance, still the normal work of dimming function can be kept, dimming scope is wide.
In the present embodiment, secondary current rectifying and wave filtering circuit 5 circuit comprises circuit of synchronous rectification, and circuit of synchronous rectification realizes based on IR11682 chip.The mode of synchronous rectification is adopted to carry out rectification process to the voltage that LLC translation circuit 4 exports, effectively can improve rectification effect, the quality of drive circuit output current is provided, further, IR11682 chip is adopted to realize synchronous rectification, circuit integrity structure is simple, and required electronic device is few, has effectively saved cost.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not the restriction to the utility model protection range; although done to explain to the utility model with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical solution of the utility model or equivalent replacement, and not depart from essence and the scope of technical solutions of the utility model.
Claims (7)
1. the LED drive circuit that a stability is high, it is characterized in that: comprise the pfc circuit, LLC translation circuit and the secondary current rectifying and wave filtering circuit that connect successively, described LLC translation circuit is sent to after the electric current of described pfc circuit to input carries out PFC correction, described LLC translation circuit is delivered to secondary current rectifying and wave filtering circuit after carrying out power conversion to the electric current inputted by PFC, described secondary current rectifying and wave filtering circuit is sent to load after carrying out synchronous rectification to electric current, and described secondary current rectifying and wave filtering circuit realizes based on IR11682 chip.
2. the LED drive circuit that a kind of stability as claimed in claim 1 is high, is characterized in that: also comprise a current rectifying and wave filtering circuit, inputs in pfc circuit after civil power is transformed to direct current by a described current rectifying and wave filtering circuit.
3. the LED drive circuit that a kind of stability as claimed in claim 2 is high, is characterized in that: also comprise EMC filter circuit, and civil power inputs to a described current rectifying and wave filtering circuit after EMC filter circuit.
4. the LED drive circuit that a kind of stability as claimed in claim 1 is high, it is characterized in that: also comprise constant pressure and flow regulating circuit, described constant pressure and flow regulating circuit is sampled from the output of this LED drive circuit and is generated conditioning signal and exports LLC translation circuit to.
5. the LED drive circuit that a kind of stability as claimed in claim 1 is high, is characterized in that: described pfc controller U2 from system power supply end VCC power taking, described LLC controller U1 through delay circuit from system power supply end VCC power taking.
6. the LED drive circuit that a kind of stability as claimed in claim 5 is high, it is characterized in that: described delay circuit comprises switching tube Q20, storage capacitor C4 and is also the charging paths of storage capacitor charging from system power supply end VCC power taking, the collector electrode connected system power end VCC of described switching tube Q2O, emitter connects the power end VDD of LLC controller U1, base stage connects the positive pole of storage capacitor C4, be that storage capacitor C4 charges, until the cathode voltage of storage capacitor C4 triggers described switching tube by charging paths when described system power supply end VCC starts power supply.
7. the LED drive circuit that a kind of stability as claimed in claim 1 is high, it is characterized in that: the auxiliary power circuit also comprising constant pressure and flow regulating circuit and power for constant pressure and flow regulating circuit, described constant pressure and flow regulating circuit is sampled from the output of described secondary current rectifying and wave filtering circuit and is combined the outside dim signal inputted and generates, send conditioning signal to described LLC translation circuit, and then regulate the output of described LLC translation circuit, described auxiliary power circuit comprises the first power taking end and the second power taking end, described LLC translation circuit comprises transformer T1, described first power taking end is from the secondary side power taking of described transformer T1, described second power taking end is from the former limit power taking of described transformer T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520231180.4U CN204948393U (en) | 2015-04-17 | 2015-04-17 | The LED drive circuit that a kind of stability is high |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520231180.4U CN204948393U (en) | 2015-04-17 | 2015-04-17 | The LED drive circuit that a kind of stability is high |
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| CN204948393U true CN204948393U (en) | 2016-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520231180.4U Expired - Fee Related CN204948393U (en) | 2015-04-17 | 2015-04-17 | The LED drive circuit that a kind of stability is high |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102206A (en) * | 2016-05-28 | 2016-11-09 | 李宗凤 | Lamp is with driving power supply |
| CN108183617A (en) * | 2018-02-06 | 2018-06-19 | 北京航天发射技术研究所 | A kind of synchronous rectification control method and control device |
| CN108521695A (en) * | 2018-04-16 | 2018-09-11 | 长沙百联明卓电子科技有限公司 | A kind of intelligent control dimming power source |
| CN108934106A (en) * | 2018-04-16 | 2018-12-04 | 长沙百联明卓电子科技有限公司 | A kind of intelligent control light modulation method |
| CN111641343A (en) * | 2020-06-11 | 2020-09-08 | 深圳爱易瑞科技有限公司 | Low-loss 5G communication base station's power |
-
2015
- 2015-04-17 CN CN201520231180.4U patent/CN204948393U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102206A (en) * | 2016-05-28 | 2016-11-09 | 李宗凤 | Lamp is with driving power supply |
| CN106102206B (en) * | 2016-05-28 | 2019-06-28 | 李宗凤 | Lamp driving power |
| CN108183617A (en) * | 2018-02-06 | 2018-06-19 | 北京航天发射技术研究所 | A kind of synchronous rectification control method and control device |
| CN108521695A (en) * | 2018-04-16 | 2018-09-11 | 长沙百联明卓电子科技有限公司 | A kind of intelligent control dimming power source |
| CN108934106A (en) * | 2018-04-16 | 2018-12-04 | 长沙百联明卓电子科技有限公司 | A kind of intelligent control light modulation method |
| CN111641343A (en) * | 2020-06-11 | 2020-09-08 | 深圳爱易瑞科技有限公司 | Low-loss 5G communication base station's power |
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| Date | Code | Title | Description |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160106 Termination date: 20190417 |