CN204190974U - Single-stage PFC isolated form former limit feedback LED Drive and Control Circuit - Google Patents
Single-stage PFC isolated form former limit feedback LED Drive and Control Circuit Download PDFInfo
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- CN204190974U CN204190974U CN201420507335.8U CN201420507335U CN204190974U CN 204190974 U CN204190974 U CN 204190974U CN 201420507335 U CN201420507335 U CN 201420507335U CN 204190974 U CN204190974 U CN 204190974U
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Abstract
The utility model discloses a kind of single-stage PFC isolated form former limit feedback LED Drive and Control Circuit; Comprise ac input end, bridge rectifier, send shape filter circuit, transformer regulating circuit, DC output end and former limit feedback control circuit, wherein, former limit feedback control circuit is arranged at describedly sends between shape filter circuit and described transformer regulating circuit, in order to carry out inverse-excitation type control to the output voltage after transformer regulating circuit voltage regulation and output current, export high precisely constant-current dc electricity to make described DC output end; The utility model can possess the energy storage of transformer T1, transformation and output voltage etc. can operate controllable functions; DC output end is made to keep constant current output; and whole circuit forms cycle overcurrent protection; make the utility model long service life; further, experiment proves, the utility model is in full voltage input range; output constant pressure and flow precision all can remain on+/-5% within, make overall efficiency high.
Description
Technical field
The utility model relates to LED illumination System technical field, specifically, relates to a kind of single-stage PFC isolated form former limit feedback LED Drive and Control Circuit.
Background technology
Concern LED illumination, it all needs to use LED drive circuit substantially, in prior art, LED drive circuit is except meeting except safety requirements, other basic function demand should meet two aspects, one is keep constant-current characteristics as far as possible, especially when the variation of ± 15% occurs supply voltage, output current still should be able to be kept to change in the scope of ± 10%; Two is oneself power consumptions that drive circuit should keep lower, and the system effectiveness of LED so just can be made to remain on higher level.
But, LED drive circuit of the prior art, its constant-current characteristics is general all not high, and the power consumption of self is larger, make relevant LED operationally, the heat distributed is large, and then, make it easily aging, make useful life short, and in prior art, also components and parts such as adopting optocoupler are had output end voltage to be fed back to input, input is again according to feedback signal regulation output voltage, and then, corresponding output current is made to remain on constant current state, but, when adding the components and parts such as optocoupler, the structure of circuit can be made comparatively complicated, and also need other a large amount of components and parts, and then, make high cost, and be unfavorable for environmental protection,
By this, for the defect of prior art, improved the circuit structure etc. of existing LED drive circuit, to make, it can reduce costs, energy-conserving and environment-protective, and meets constant current output, makes output accuracy high, is then necessary.
Utility model content
The purpose of this utility model is to overcome the deficiency of above-mentioned prior art and a kind of single-stage PFC isolated form former limit feedback LED Drive and Control Circuit of providing.
The technical scheme that the utility model solution prior art problem adopts is: a kind of single-stage PFC isolated form former limit feedback LED Drive and Control Circuit, and its improvement is, it comprises:
Ac input end, in order to input ac voltage;
Bridge rectifier, is connected with ac input end, in order to carry out rectification to inputted alternating voltage;
Send shape filter circuit, be connected with described bridge rectifier, filtering is carried out to the voltage after over commutation, to make the direct current of output smoothing;
Transformer regulating circuit, is connected with the described output of shape filter circuit of sending, in order to carry out pressure regulation to exported direct current, to make the required direct current of output;
DC output end, is connected with described transformer regulating circuit, in order to export described required direct current;
Former limit feedback control circuit, be arranged at and describedly send between shape filter circuit and described transformer regulating circuit, in order to carry out inverse-excitation type control to the output voltage after transformer regulating circuit voltage regulation and output current, export high precisely constant current constant voltage direct current to make described DC output end.
Below above technical scheme is further elaborated:
Preferably, described transformer regulating circuit comprises transformer T1, described transformer T1 comprises primary coil L1 and secondary coil L2; The first end of described primary coil L1 is connected with the described output of shape filter circuit of sending; The two ends of described secondary coil L2 are connected to described DC output end by a current rectifying and wave filtering circuit.
Preferably, described former limit feedback control circuit comprises former limit FEEDBACK CONTROL chip, metal-oxide-semiconductor Q1, starting resistance R1, protective resistance R2, detects resistance R3, shunt resistance R4, filter capacitor C3, storage capacitor C4;
Wherein, described former limit FEEDBACK CONTROL chip comprises SEN pin, DRV pin, VDD pin, GND pin and COM pin; Described VDD pin is connected to the output of sending shape filter circuit by starting resistance R1 on the one hand, on the other hand by the storage capacitor C4 that is connected in series and detect the source class that resistance R3 is connected to metal-oxide-semiconductor Q1; Described DRV pin is connected to the grid of described metal-oxide-semiconductor Q1 by protective resistance R2; The drain electrode of metal-oxide-semiconductor Q1 is connected to second end of primary coil L1; Described SEN pin is connected directly to the source class of described metal-oxide-semiconductor Q1; Described GND pin ground connection; The node that described COM pin is connected to described storage capacitor C4 by the shunt resistance R4 that is connected in series and filter capacitor C3 and is detected between resistance R3, and storage capacitor C4 and the node ground connection detected between resistance R3.
Preferably, described former limit feedback control circuit also comprises voltage sampling circuit, and described voltage sampling circuit comprises resistance R5, resistance R6 and rectifier diode D5, and described transformer T1 also comprises feedback coil L3, and described former limit FEEDBACK CONTROL chip also comprises INV pin; Wherein, the first end being connected to described feedback coil L3 that described resistance R5 and resistance R6 connects and the second end, and the node between described resistance R5 and resistance R6 is connected to described INV pin, node ground connection between described resistance R5 and the first end of feedback coil L3, node between described resistance R6 and second end of feedback coil L3 is connected to the positive pole of described rectifier diode D5, and the negative pole of described rectifier diode D5 is connected to described VDD pin.
Preferably, also comprise a peak absorbing circuit, described peak absorbing circuit comprises resistance R7, electric capacity C5 and rectifier diode D6, one end of described resistance R7 and electric capacity C5 connects the first end of described primary coil L1, the other end of described resistance R7 and electric capacity C5 connects the negative pole of described rectifier diode D6, and the positive pole of described rectifier diode D6 is connected to second end of described primary coil L1.
Preferably, described shape filter circuit of sending comprises inductance L 4, electric capacity C1 and electric capacity C2, node between described inductance L 4 and electric capacity C1 is connected to the output of described rectifier bridge, node between described inductance L 4 and electric capacity C2 is connected to the first end of described starting resistance R1 and described primary coil L1, the node ground connection between described electric capacity C1 and electric capacity C2.
Preferably, also comprise a load resistance R6, described load resistance R6 is connected between described current rectifying and wave filtering circuit and described DC output end.
Preferably, described current rectifying and wave filtering circuit comprises rectifier diode D7 and filter capacitor C6; The positive pole of described rectifier diode D7 is connected with second end of described secondary coil L2, and positive pole and the DC output end of negative pole and described filter capacitor C6 are connected; The negative pole of described filter capacitor C6 is connected to the first end of described secondary coil L2 on the one hand, on the other hand ground connection; Between the positive pole that described load resistance R6 is connected to described filter capacitor C6 and negative pole.
Preferably, described former limit FEEDBACK CONTROL chip is M8910 chip.
Preferably, the packing forms of described former limit FEEDBACK CONTROL chip is SOT-23-6.
The beneficial effects of the utility model are:
A kind of single-stage PFC isolated form provided by the utility model former limit feedback LED Drive and Control Circuit; in the course of the work; the utility model can possess the energy storage of transformer T1, transformation and output voltage etc. can operate controllable functions; DC output end is made to keep constant current output; and whole circuit forms cycle overcurrent protection; make the utility model long service life; and; experiment proves; the utility model is in full voltage input range; output constant current accuracy all can remain on+/-5% within, make overall efficiency high.
Accompanying drawing explanation
Fig. 1 is the integrated circuit figure of the utility model single-stage PFC isolated form former limit feedback LED Drive and Control Circuit;
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Wherein, ac input end 10; Bridge rectifier 20; Send shape filter circuit 30; Transformer regulating circuit 40; DC output end 50; Former limit feedback control circuit 60; Former limit FEEDBACK CONTROL chip 601; Voltage sampling circuit 602; Current rectifying and wave filtering circuit 70; Peak absorbing circuit 80;
Embodiment
Below with reference to drawings and the specific embodiments describe in detail the technical solution of the utility model so as clearer, understand invention essence of the present utility model intuitively.
Fig. 1 is the integrated circuit figure of the utility model single-stage PFC isolated form former limit feedback LED Drive and Control Circuit;
Shown in composition graphs 1, a kind of single-stage PFC isolated form provided by the utility model former limit feedback LED Drive and Control Circuit, the drive circuit drive circuit be mainly used in as LED uses;
Specifically, a kind of single-stage PFC isolated form provided by the utility model former limit feedback LED Drive and Control Circuit, comprises ac input end 10, bridge rectifier 20, sends shape filter circuit 30, transformer regulating circuit 40, DC output end 50 and former limit feedback control circuit 60;
Wherein, described ac input end 10 is in order to input ac voltage, and it comprises live wire L and zero line N; Described bridge rectifier 20 is connected with ac input end 10, and in order to carry out rectification to inputted alternating voltage, it comprises rectifier diode D1, D2, D3 and D4; Described shape filter circuit 30 of sending is connected with described bridge rectifier 20, carries out filtering to the voltage after over commutation, and to make the direct current of output smoothing, it comprises inductance L 4, electric capacity C1 and electric capacity C2; Described transformer regulating circuit 40 is connected with the described output of shape filter circuit 30 of sending, in order to carry out pressure regulation to exported direct current, to make the required direct current of output; Described DC output end 50 is connected with described transformer regulating circuit 40, in order to export described required direct current; Described former limit feedback control circuit 60 is arranged at describedly sends between shape filter circuit 30 and described transformer regulating circuit 40, in order to carry out inverse-excitation type control to the output voltage after transformer regulating circuit 40 pressure regulation and output current, export high precisely constant current constant voltage direct current to make described DC output end 50.
In the specific implementation, in the present embodiment, described transformer regulating circuit 40 comprises transformer T1, described transformer T1 comprises primary coil L1 and secondary coil L2; The first end of described primary coil L1 is connected with the described output of shape filter circuit 30 of sending; The two ends of described secondary coil L2 are connected to described DC output end 50 by a current rectifying and wave filtering circuit 70.
Described former limit feedback control circuit 60 comprises former limit FEEDBACK CONTROL chip 601, metal-oxide-semiconductor Q1, starting resistance R1, protective resistance R2, detects resistance R3, shunt resistance R4, filter capacitor C3, storage capacitor C4;
Wherein, described former limit FEEDBACK CONTROL chip 601 comprises SEN pin, DRV pin, VDD pin, GND pin and COM pin; Described VDD pin is connected to the output of sending shape filter circuit 30 by starting resistance R1 on the one hand, on the other hand by the storage capacitor C4 that is connected in series and detect the source class that resistance R3 is connected to metal-oxide-semiconductor Q1; Described DRV pin is connected to the grid of described metal-oxide-semiconductor Q1 by protective resistance R2; The drain electrode of metal-oxide-semiconductor Q1 is connected to second end of primary coil L1; Described SEN pin is connected directly to the source class of described metal-oxide-semiconductor Q1; Described GND pin ground connection; The node that described COM pin is connected to described storage capacitor C4 by the shunt resistance R4 that is connected in series and filter capacitor C3 and is detected between resistance R3, and storage capacitor C4 and the node ground connection detected between resistance R3.
As preferred version, described former limit feedback control circuit 60 in the present embodiment also comprises voltage sampling circuit 602, described voltage sampling circuit 602 comprises resistance R5, resistance R6 and rectifier diode D5, described transformer T1 also comprises feedback coil L3, and described former limit FEEDBACK CONTROL chip 601 also comprises INV pin; Wherein, the first end being connected to described feedback coil L3 that described resistance R5 and resistance R6 connects and the second end, and the node between described resistance R5 and resistance R6 is connected to described INV pin, node ground connection between described resistance R5 and the first end of feedback coil L3, node between described resistance R6 and second end of feedback coil L3 is connected to the positive pole of described rectifier diode D5, and the negative pole of described rectifier diode D5 is connected to described VDD pin.
Further, the utility model also comprises a peak absorbing circuit 80, described peak absorbing circuit 80 comprises resistance R7, electric capacity C5 and rectifier diode D6, one end of described resistance R7 and electric capacity C5 connects the first end of described primary coil L1, the other end of described resistance R7 and electric capacity C5 connects the negative pole of described rectifier diode D6, and the positive pole of described rectifier diode D6 is connected to second end of described primary coil L1.
It should be noted that, in the present embodiment, described shape filter circuit 30 of sending comprises inductance L 4, electric capacity C1 and electric capacity C2, node between described inductance L 4 and electric capacity C1 is connected to the output of described rectifier bridge, node between described inductance L 4 and electric capacity C2 is connected to the first end of described starting resistance R1 and described primary coil L1, the node ground connection between described electric capacity C1 and electric capacity C2.
And the utility model also comprises a load resistance R6, described load resistance R6 is connected between described current rectifying and wave filtering circuit 70 and described DC output end 50.
And then, it is emphasized that described current rectifying and wave filtering circuit 70 comprises rectifier diode D7 and filter capacitor C6; The positive pole of described rectifier diode D7 is connected with second end of described secondary coil L2, and positive pole and the DC output end 50 of negative pole and described filter capacitor C6 are connected; The negative pole of described filter capacitor C6 is connected to the first end of described secondary coil L2 on the one hand, on the other hand ground connection; Between the positive pole that described load resistance R6 is connected to described filter capacitor C6 and negative pole.
And on the whole, former limit FEEDBACK CONTROL chip 601 described above is M8910 chip; Further, the packing forms of described former limit FEEDBACK CONTROL chip 601 is SOT-23-6.
By described above known, roughly operation principle of the present utility model is:
First, by ac input end 10 input AC electricity, and respectively by described bridge rectifier 20 and send shape filter circuit 30 to carry out rectification and filtering, with the direct current making formation level and smooth;
This level and smooth direct current powers to described former limit FEEDBACK CONTROL chip 601 by VDD pin on the one hand after starting resistance R1, former limit FEEDBACK CONTROL chip 601 gives a drive singal to described metal-oxide-semiconductor Q1 by described DRV pin, and then, metal-oxide-semiconductor Q1 conducting, the work of former limit FEEDBACK CONTROL chip 601 control transformer T1, this level and smooth direct current conducts to the primary coil L1 of described transformer T1 and secondary coil L2 on the other hand and carries out transformation and energy storage, when relevant energy storage is too high, detect resistance R3 and a too high current signal will be detected, and this current signal is fed back to the SEN pin of described former limit FEEDBACK CONTROL chip 601, and then, former limit FEEDBACK CONTROL chip 601 gives a drive singal to metal-oxide-semiconductor Q1 again, now, metal-oxide-semiconductor Q1 turns off, the electric current flowing through primary coil L1 then flows through the resistance R7 to peak absorbing circuit 80, electric capacity C5 and rectifier diode D6, electric capacity C5 energy reserve on the one hand, resistance R7 consumed energy on the other hand, namely ceaselessly cyclic absorption and consumption is made, so that the energy reserve of transformer T1 can not be made too high,
Meanwhile, while transformer T1 energy storage transformation, described feedback coil L3 also works simultaneously, can sample to the voltage that primary coil L1 exports to make described voltage sampling circuit 602 simultaneously, and by the resistance R3 of himself and the shunting dividing potential drop of resistance R4 be used for equilibrium phase close voltage, relevant voltage signal of sampling is transferred to VDD pin by the one hand, and carry out energy storage by storage capacitor C4, on the other hand, sampled voltage signal is transferred to INV pin, after its internal arithmetic, export by DRV pin the duty ratio that control signal controls adjustment output waveform to make former limit FEEDBACK CONTROL chip 601, and then the adjustment realized DC output end 50 electric current, keep constant current output.
So; known by above-mentioned described operation principle process of the present utility model; the utility model possesses the energy storage of transformer T1, transformation and output voltage etc. can operate controllable functions; DC output end 50 is made to keep constant current output; and the voltage also making DC output end 50 export can meet load supplying demand; and form cycle overcurrent protection; make the utility model long service life; and; experiment proves; the utility model in full voltage input range, output constant pressure and flow precision all can remain on+/-5% within, make overall efficiency high.
It is emphasized that when specifically implementing, the utility model also has additional load resistance R8, make effectively to prevent unloaded vibration.
Thus it is low that the utility model has no-load power consumption, the advantages such as overall efficiency is high, DC output end 50 constant current output, and eliminate the components and parts such as optocoupler, cost is reduced greatly, and then, the utility model will inevitably very welcome, can effectively be promoted and extensive use.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a single-stage PFC isolated form former limit feedback LED Drive and Control Circuit, it is characterized in that, it comprises:
Ac input end, in order to input ac voltage;
Bridge rectifier, is connected with ac input end, in order to carry out rectification to inputted alternating voltage;
Send shape filter circuit, be connected with described bridge rectifier, filtering is carried out to the voltage after over commutation, to make the direct current of output smoothing;
Transformer regulating circuit, is connected with the described output of shape filter circuit of sending, in order to carry out pressure regulation to exported direct current, to make the required direct current of output;
DC output end, is connected with described transformer regulating circuit, in order to export described required direct current;
Former limit feedback control circuit, be arranged at and describedly send between shape filter circuit and described transformer regulating circuit, in order to carry out inverse-excitation type control to the output voltage after transformer regulating circuit voltage regulation and output current, export high precisely constant current constant voltage direct current to make described DC output end.
2. single-stage PFC isolated form according to claim 1 former limit feedback LED Drive and Control Circuit, is characterized in that: described transformer regulating circuit comprises transformer T1, described transformer T1 comprises primary coil L1 and secondary coil L2; The first end of described primary coil L1 is connected with the described output of shape filter circuit of sending; The two ends of described secondary coil L2 are connected to described DC output end by a current rectifying and wave filtering circuit.
3. single-stage PFC isolated form according to claim 1 former limit feedback LED Drive and Control Circuit, is characterized in that: described former limit feedback control circuit comprises former limit FEEDBACK CONTROL chip, metal-oxide-semiconductor Q1, starting resistance R1, protective resistance R2, detects resistance R3, shunt resistance R4, filter capacitor C3, storage capacitor C4;
Wherein, described former limit FEEDBACK CONTROL chip comprises SEN pin, DRV pin, VDD pin, GND pin and COM pin; Described VDD pin is connected to the output of sending shape filter circuit by starting resistance R1 on the one hand, on the other hand by the storage capacitor C4 that is connected in series and detect the source class that resistance R3 is connected to metal-oxide-semiconductor Q1; Described DRV pin is connected to the grid of described metal-oxide-semiconductor Q1 by protective resistance R2; The drain electrode of metal-oxide-semiconductor Q1 is connected to second end of primary coil L1; Described SEN pin is connected directly to the source class of described metal-oxide-semiconductor Q1; Described GND pin ground connection; The node that described COM pin is connected to described storage capacitor C4 by the shunt resistance R4 that is connected in series and filter capacitor C3 and is detected between resistance R3, and storage capacitor C4 and the node ground connection detected between resistance R3.
4. single-stage PFC isolated form according to claim 3 former limit feedback LED Drive and Control Circuit, it is characterized in that: described former limit feedback control circuit also comprises voltage sampling circuit, described voltage sampling circuit comprises resistance R5, resistance R6 and rectifier diode D5, described transformer T1 also comprises feedback coil L3, and described former limit FEEDBACK CONTROL chip also comprises INV pin; Wherein, the first end being connected to described feedback coil L3 that described resistance R5 and resistance R6 connects and the second end, and the node between described resistance R5 and resistance R6 is connected to described INV pin, node ground connection between described resistance R5 and the first end of feedback coil L3, node between described resistance R6 and second end of feedback coil L3 is connected to the positive pole of described rectifier diode D5, and the negative pole of described rectifier diode D5 is connected to described VDD pin.
5. single-stage PFC isolated form according to claim 1 former limit feedback LED Drive and Control Circuit, it is characterized in that: also comprise a peak absorbing circuit, described peak absorbing circuit comprises resistance R7, electric capacity C5 and rectifier diode D6, one end of described resistance R7 and electric capacity C5 connects the first end of described primary coil L1, the other end of described resistance R7 and electric capacity C5 connects the negative pole of described rectifier diode D6, and the positive pole of described rectifier diode D6 is connected to second end of described primary coil L1.
6. single-stage PFC isolated form according to claim 3 former limit feedback LED Drive and Control Circuit, it is characterized in that: described shape filter circuit of sending comprises inductance L 4, electric capacity C1 and electric capacity C2, node between described inductance L 4 and electric capacity C1 is connected to the output of described rectifier bridge, node between described inductance L 4 and electric capacity C2 is connected to the first end of described starting resistance R1 and described primary coil L1, the node ground connection between described electric capacity C1 and electric capacity C2.
7. single-stage PFC isolated form according to claim 2 former limit feedback LED Drive and Control Circuit, it is characterized in that: also comprise a load resistance R6, described load resistance R6 is connected between described current rectifying and wave filtering circuit and described DC output end.
8. single-stage PFC isolated form according to claim 7 former limit feedback LED Drive and Control Circuit, is characterized in that: described current rectifying and wave filtering circuit comprises rectifier diode D7 and filter capacitor C6; The positive pole of described rectifier diode D7 is connected with second end of described secondary coil L2, and positive pole and the DC output end of negative pole and described filter capacitor C6 are connected; The negative pole of described filter capacitor C6 is connected to the first end of described secondary coil L2 on the one hand, on the other hand ground connection; Between the positive pole that described load resistance R6 is connected to described filter capacitor C6 and negative pole.
9. the former limit of the single-stage PFC isolated form according to any one of claim 1-8 feedback LED Drive and Control Circuit, is characterized in that: described former limit FEEDBACK CONTROL chip is M8910 chip.
10. single-stage PFC isolated form according to claim 9 former limit feedback LED Drive and Control Circuit, is characterized in that: the packing forms of described former limit FEEDBACK CONTROL chip is SOT-23-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420507335.8U CN204190974U (en) | 2014-09-03 | 2014-09-03 | Single-stage PFC isolated form former limit feedback LED Drive and Control Circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420507335.8U CN204190974U (en) | 2014-09-03 | 2014-09-03 | Single-stage PFC isolated form former limit feedback LED Drive and Control Circuit |
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| CN204190974U true CN204190974U (en) | 2015-03-04 |
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| CN201420507335.8U Expired - Fee Related CN204190974U (en) | 2014-09-03 | 2014-09-03 | Single-stage PFC isolated form former limit feedback LED Drive and Control Circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108093517A (en) * | 2017-12-19 | 2018-05-29 | 深圳民爆光电技术有限公司 | A kind of LED constant current constant voltage power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108093517A (en) * | 2017-12-19 | 2018-05-29 | 深圳民爆光电技术有限公司 | A kind of LED constant current constant voltage power supply circuit |
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Granted publication date: 20150304 Termination date: 20180903 |