CN101657057B - LED power circuit - Google Patents
LED power circuit Download PDFInfo
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- CN101657057B CN101657057B CN 200910305942 CN200910305942A CN101657057B CN 101657057 B CN101657057 B CN 101657057B CN 200910305942 CN200910305942 CN 200910305942 CN 200910305942 A CN200910305942 A CN 200910305942A CN 101657057 B CN101657057 B CN 101657057B
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Abstract
The invention relates to an LED power circuit comprising a bridge rectifier circuit, a driving circuit, a transformation rectification circuit, a switch circuit, a feedback circuit and an LED light-source circuit. The bridge rectifier circuit is used for rectifying AC power input by commercial power; the driving circuit is used for keeping the LED power circuit connecting to a traditional dimmer to work normally; the transformation rectification circuit is used for providing working current for the LED power circuit under the control of the switch circuit; and the feedback circuit feeds back a working voltage to the switch circuit from the transformation rectification circuit.
Description
Technical field
The invention belongs to electronic technology field, relate to a kind of power circuit, specifically a kind of illuminating LED power circuit.
Background technology
LED illumination is energy-efficient with it, environment friendly and pollution-free, good visual effect, long plurality of advantages of life-span are progressively replacing most traditional lighting mode, becomes the main flow of lighting technology development.General LED light fixture is all that a lot of LED lamp pearls are concentrated in together, and makes the style close with conventional lamp, as LED fluorescent lamp, LED ceiling light, LED shot-light and so on.Yet in the technical field of LED illumination, also exist many problems to hinder the popularization and application of LED illumination.
The light adjusting circuit of conventional lamp such as incandescent lamp, Halogen lamp LED is controllable silicon light modulation of series connection before its power line.In the LED illuminator, provide constant current to drive because existing LED illuminator adopts the alternating-current switch power supply usually when the controllable silicon light modulation circuit application of conventional lamp, there are some following shortcomings in its drive circuit:
One, the power transfer factor is lower, and the PF value is greatly between 0.2 ~ 0.6;
Two, electric power output voltage is unstable, and LED brightness when being threaded to maximum end changes not obviously as dimmer turn-knob angle, and hour brightness changes again very greatly being threaded in the turn-knob angle, and when causing light modulation, feel is very poor;
Three, uncomfortable optical phenomenon, even appear in power supply and dimmer poor compatibility, i.e. brightness changes very little;
Four, controllable silicon dimmer has larger rush of current, causes circuit unstable, and reliability is lower.
Summary of the invention
Prior art LED electrical source power factor is low in order to solve, poor compatibility, problem that reliability is low, is necessary to provide that a kind of power factor (PF) is high, the compatible good and high LED power circuit of reliability.
A kind of LED power circuit, comprise a bridge rectifier, one drive circuit, a transformation rectification circuit, an ON-OFF control circuit, a feedback circuit and a LED light source circuit, this bridge rectifier is used for the alternating current of civil power input is carried out rectification, this drive circuit is used for keeping this LED power circuit to connect the dimmer normal operation, this transformation rectification circuit is used under the control of this switching circuit for this LED light source circuit provides operating current, and this feedback circuit is used for from this transformation rectification circuit feedback one operating voltage to this switching circuit; Also comprise a dimmer, this dimmer comprises one first dimming resistor, a controllable silicon and one first dimming capacitors, this first dimming resistor and the series connection of this first dimming capacitors, this first dimming resistor is also connected to civil power N end, this first dimming capacitors is connected to this bridge rectifier, this silicon controlled control end is connected to a node between this first dimming resistor and this first dimming capacitors, and its input connects civil power L end, and output connects this bridge rectifier; This dimmer connects this bridge rectifier, this bridge rectifier connects this drive circuit, this drive circuit connects this transformation rectification circuit, this LED lamp connects this transformation rectification circuit, this ON-OFF control circuit, connect this transformation rectification circuit,, this transformation rectification circuit also is connected to this ON-OFF control circuit by this feedback circuit.
In LED power circuit of the present invention, this bridge rectifier comprises a diode rectifier bridge, this diode rectifier bridge comprises 4 end to end diodes, and this diode rectifier bridge comprises A, B, C and four ends of D, and this dimmer is connected to the A end of this diode rectifier bridge.
In LED power circuit of the present invention, this drive circuit comprises that one detects control circuit, a switching circuit, a buffer circuit, this detects control circuit for detection of the angle of flow of every sine wave period dimmer, carry out removing the control switch circuit after certain time-delay the surge current when this buffer circuit is used for suppressing each sine wave period dimmer conduction.
In LED power circuit of the present invention, this detection control circuit comprises one first buffer resistance and a buffer capacitor, and this switching circuit comprises a buffering triode, and this buffer circuit comprises one second buffer resistance.The base stage of this buffering triode is connected to the B end of this diode rectifier bridge via this first buffer resistance, its collector electrode is connected to the base stage of this buffering triode via this second buffer resistance, this buffer capacitor, the emitter of this buffering triode is connected to the D end of this diode rectifier bridge, civil power N end is connected to the C end of this diode rectifier bridge via this continued flow resistance, the collector electrode of this buffering triode also is connected to the B end of this diode rectifier bridge BD1 via this afterflow electric capacity.
In LED power circuit of the present invention, this transformation rectification circuit comprises one first coil, one second coil, a rectifier diode and a filter capacitor, this the first coil one end connects the B end of this diode rectifier bridge, the other end connects this switching circuit, this the second coil one end is successively via positive pole and the minus earth of the positive pole of this rectifier diode and negative pole, this filter capacitor, its other end ground connection, this rectifier diode and this filter capacitor are used to the voltage commutation filtering that is input to this LED light source circuit.
In LED power circuit of the present invention, this switching circuit comprises a pulse-width modulation circuit and a switching tube, the grid of this switching tube is connected to a control end of this pulse-width modulation circuit, source electrode is connected to the collector electrode of this buffering triode, drain electrode is connected to this first coil, and this pulse-width modulation circuit also connects this feedback circuit.
In LED power circuit of the present invention, this feedback circuit comprises an optical coupler and a resistance, Schottky diode, the positive pole of this optical coupler is connected to the negative pole of this rectifier diode via this Schottky diode, and connects the power end of this pulse-width modulation circuit, is used to it that operating voltage is provided.
In LED power circuit of the present invention, this LED light source circuit comprises at least one light-emitting diode, and the one end connects ground connection, and the other end connects the negative pole of this rectifier diode.
in LED power circuit of the present invention, when this LED power circuit normal operation, be input to this switching circuit with afterflow electric capacity after the bridge commutating of alternating current by 4 diodes compositions of civil power N end and the input of L end, this switching tube constantly switches between conducting state and closed condition, thereby this transformation rectification circuit produces the operating current that is provided to this LED power circuit, the switching frequency of this switching tube is controlled by this pulse-width modulation circuit, when this switching tube is in closed condition, civil power charges to this afterflow electric capacity by this continued flow resistance Rx1 and this diode rectifier bridge, make and flow through this silicon controlled electric current and be not less than this silicon controlled and keep electric current.
In LED power circuit of the present invention, when this dimmer was the forward position phase-controlled dimmer, when this controlled silicon conducting of each sinusoidal period, this first buffer resistance, this buffer capacitor and this buffering triode and this afterflow Capacitance parallel connection conducting were this afterflow electric capacity shunting.
Compared to prior art, LED power circuit of the present invention comprises this drive circuit, can effectively keep electric current for this dimmer provides, and prevents that it is subject to rush of current for the forward position light modulation time, thereby make above-mentioned LED power circuit efficient higher, compatibility and reliability are higher.
Description of drawings
Fig. 1 is the block diagram of LED power circuit one better embodiment of the present invention.
Fig. 2 is the electrical block diagram of LED power circuit shown in Figure 1.
Embodiment
Below in conjunction with Figure of description, embodiment of the present invention is illustrated.
Seeing also Fig. 1, is the block diagram of LED power circuit one better embodiment of the present invention.This LED power circuit 1 comprises a dimmer 10, a bridge rectifier 20, one drive circuit 30, a transformation rectification circuit 40, an ON-OFF control circuit 50, a feedback circuit 60 and a LED lamp 70.This dimmer 10 connects this bridge rectifier 20.This bridge rectifier 20 connects this drive circuit 30.This drive circuit 30 connects this transformation rectification circuit 40.This LED lamp connects this transformation rectification circuit 40.This ON-OFF control circuit 50 connects this transformation rectification circuit 40, and this transformation right way circuit 40 also is connected to this ON-OFF control circuit 50 by this feedback circuit 60.
This dimmer 10 is used for regulating the voltage that is input to this rectification circuit, this bridge rectifier 20 is used for the alternating current of civil power input is carried out rectification, this drive circuit 30 is used to and keeps this dimmer 10 normal operations, and this transformation rectification circuit 40 is used for providing operating current for this LED light source circuit 70 under the control of this ON-OFF control circuit 50.This feedback circuit 60 is used for from this transformation rectification circuit 40 feedback one operating voltages to this ON-OFF control circuit 50.
Seeing also Fig. 2, is the electrical block diagram of LED power circuit 1 shown in Figure 1.This dimmer 10 comprises one first dimming resistor Rd1, a controllable silicon Qd1 and one first dimming capacitors Cd1.This first dimming resistor Rd1 and this first dimming capacitors Cd1 series connection, this first dimming resistor Rd1 is also connected to civil power L end, and this first dimming capacitors Rd1 is connected to this bridge rectifier 20.The control end of this controllable silicon Qd1 is connected to a node between this first dimming resistor Rd1 and this first dimming capacitors Cd1, and its input connects civil power L end, and output connects this bridge rectifier 20.
This bridge rectifier 20 comprises a diode rectifier bridge BD1, and this diode rectifier bridge BD1 comprises 4 end to end diodes, defines 4 diode cathodes and is respectively A, B, C, D end, as shown in the figure.This dimmer 10 is connected to the A end of this diode rectifier bridge BD1.
This drive circuit 30 comprises that one detects control circuit 31, a switching circuit 32, a buffer circuit (not indicating).This detection control circuit comprises one first buffer resistance Ry1 and a buffer capacitor Cy1.This switching circuit comprises a buffering triode Qy1.This buffer circuit comprises one second buffer resistance Ry2.The base stage of this buffering triode Qy1 is connected to the B end of this diode rectifier bridge BD1 via this first buffer resistance Ry1, its collector electrode is connected to the base stage of this buffering triode Qy1 via this second buffer resistance Ry2, this buffer capacitor Cy1, the emitter of this buffering triode Qy1 is connected to the D end of this diode rectifier bridge BD1.Civil power N end is connected to the C end of this diode rectifier bridge BD1 via this continued flow resistance Rx1.The collector electrode of this buffering triode Qy1 also is connected to the B end of this diode rectifier bridge BD1 via this afterflow capacitor C x1.
This transformation rectification circuit 40 comprises one first coil L1, one second coil L2, a rectifier diode D1 and a filter capacitor C3.This first coil L1 one end connects the B end of this diode rectifier bridge BD1, and the other end connects this ON-OFF control circuit 50.This second coil L2 one end is successively via positive pole and the minus earth of the positive pole of this rectifier diode D1 and negative pole, this filter capacitor C3, its other end ground connection.This rectifier diode D1 and this filter capacitor C3 are used to the voltage commutation filtering that is input to this LED light source circuit.
This ON-OFF control circuit 50 comprises a pulse-width modulation circuit U1 and a switching tube Q1.The grid of this switching tube Q1 is connected to the control end of this pulse-width modulation circuit U1, and source electrode is connected to the collector electrode of this buffering triode, and drain electrode is connected to this first coil L1.This pulse-width modulation circuit U1 also connects this feedback circuit 60.
This feedback circuit 60 comprises an optical coupler U2 and a resistance R 4, Schottky diode D2, the positive pole of this optical coupler U2 is connected to the negative pole of this rectifier diode D1 via this Schottky diode D2, and connect the power end of this pulse-width modulation circuit U1, be used to it that operating voltage is provided.
This LED light source circuit 70 comprises at least one light-emitting diode D3, and the one end connects ground connection, and the other end connects the negative pole of this rectifier diode D1.
When this LED power circuit works, be input to this ON-OFF control circuit 50 with afterflow electric capacity after the bridge commutating of alternating current by 4 diodes compositions of civil power N end and the input of L end.This switching tube Q1 constantly switches between conducting state and closed condition, thereby this transformation rectification circuit 40 produces the operating current that is provided to this LED power circuit 70.
This cushions this detection control circuit 31 for detection of the angle of flow of this dimmer 10 in every sine wave period, and carries out controlling this switching circuit 32 after certain time-delay.Surge current when this buffer circuit is used for suppressing each sine wave period dimmer conduction.In each sine wave period during this dimmer 10 conducting, flow through this rectifier bridge BD1, this afterflow capacitor C x1, this buffer resistance Ry2, this continued flow resistance Rx1 of its transient current consists of current circuit, and state is sealing in of Ry2, and its immediate current can be very little.In 10 conducting moments of this dimmer, this detection control circuit 31 also detects simultaneously and delays time, through output one control signal after certain hour, be used for controlling these switching circuit 32 conductings, electric current is directly through this this buffer resistance of switching circuit 32 short circuits Ry2, voltage on this buffer resistance Ry2 is zero, not dissipation power.
The switching frequency of this switching tube Q1 is controlled by this pulse-width modulation circuit U1.When this switching tube Q1 is in closed condition, civil power charges to this afterflow capacitor C x1 by this continued flow resistance Rx1 and this diode rectifier bridge BD1, thereby make the electric current that flows through this controllable silicon Qd1 be not less than the electric current of keeping of this controllable silicon Qd1, namely this controllable silicon Qd1 can not turn-off, thereby can not cause the misoperation of this controllable silicon Qd1, and then stroboscopic phenomenon can not appear when making this LED light source circuit 70 luminous, reach the light modulation purpose.In each conducting of this switching tube Q1 with close cycle this controllable silicon Qd1 and all have electric current to flow through, the situation of closing can not appear, can guarantee that Qd1 is in the effectively conducting in it of each sinusoidal wave week.
In addition, when this dimmer 10 is the forward position phase-controlled dimmer, when this controllable silicon of each sinusoidal period Qd1 conducting, this first buffer resistance Ry1, this buffer capacitor Cy1 and this buffering triode Qy1 and this afterflow capacitor C x1 are in parallel, can effectively prevent this controllable silicon Qd1 mutation voltage this afterflow capacitor C x1 charging is produced impulse current, prevent that effectively possible impulse current from producing interference to circuit, and further reduce power consumption.
In addition, LED power circuit 1 of the present invention goes for the common various dimmers in market, and dimming behavior can reach the effect of incandescent lamp.
In the change execution mode of LED power circuit of the present invention, detecting control circuit can be common RC circuit, can be also the application-specific integrated circuit circuit, can also be the MCU circuit, so long as the conduction detection when each sine wave period dimmer conduction and carry out suitable time-delay and control output and all can.Switching circuit can be transistor circuit, can be also the metal-oxide-semiconductor circuit, can be still thyristor circuit.In addition, the position of this continued flow resistance Rx1 not only is confined to shown position, can also be a bit in A point, D point or C point of string.This detection control circuit 31, this switching circuit 32 and this buffer circuit position also not only are confined to shown position, can be between the A point, can be also between civil power N input and B point, C point, can also be to be connected on D point place.
Compared to prior art, LED power circuit 1 of the present invention comprises this drive circuit 30, can effectively keep electric current for this dimmer 10 provides, and prevents that it is subject to rush of current for the forward position light modulation time, thereby make above-mentioned LED power circuit 1 efficient higher, compatibility and reliability are higher.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. LED power circuit, it is characterized in that: comprise a bridge rectifier, one drive circuit, one transformation rectification circuit, one ON-OFF control circuit, one feedback circuit and a LED light source circuit, this bridge rectifier is used for the alternating current of civil power input is carried out rectification, this drive circuit is used for keeping this LED power circuit to connect the dimmer normal operation, this transformation rectification circuit is used for providing operating current for this LED light source circuit under the control of this ON-OFF control circuit, this feedback circuit is used for from this transformation rectification circuit feedback one operating voltage to this ON-OFF control circuit, also comprise a dimmer, this dimmer comprises one first dimming resistor, a controllable silicon and one first dimming capacitors, this first dimming resistor and the series connection of this first dimming capacitors, this first dimming resistor is also connected to civil power N end, this first dimming capacitors is connected to this bridge rectifier, this silicon controlled control end is connected to a node between this first dimming resistor and this first dimming capacitors, and its input connects civil power L end, and output connects this bridge rectifier, this dimmer connects this bridge rectifier, this bridge rectifier connects this drive circuit, this drive circuit connects this transformation rectification circuit, this LED light source circuit connects this transformation rectification circuit, this ON-OFF control circuit, connect this transformation rectification circuit, this transformation rectification circuit also is connected to this ON-OFF control circuit by this feedback circuit.
2. LED power circuit as claimed in claim 1, it is characterized in that: this bridge rectifier comprises a diode rectifier bridge, this diode rectifier bridge comprises 4 end to end diodes, this diode rectifier bridge comprises A, B, C and four ends of D, and this dimmer is connected to the A end of this diode rectifier bridge.
3. LED power circuit as claimed in claim 2, it is characterized in that: this drive circuit comprises that one detects control circuit, a switching circuit, a buffer circuit, this detects control circuit for detection of the angle of flow of every sine wave period dimmer, carry out removing the control switch circuit after certain time-delay the surge current when this buffer circuit is used for suppressing each sine wave period dimmer conduction.
4. LED power circuit as claimed in claim 3, it is characterized in that: this detection control circuit comprises one first buffer resistance and a buffer capacitor, this switching circuit comprises a buffering triode, this buffer circuit comprises one second buffer resistance, the base stage of this buffering triode is connected to the B end of this diode rectifier bridge via this first buffer resistance, its collector electrode is via this second buffer resistance, this buffer capacitor is connected to the base stage of this buffering triode, the emitter of this buffering triode is connected to the D end of this diode rectifier bridge, civil power N end is connected to the C end of this diode rectifier bridge via continued flow resistance, the collector electrode of this buffering triode also is connected to the B end of this diode rectifier bridge via afterflow electric capacity.
5. LED power circuit as claimed in claim 4, it is characterized in that: this transformation rectification circuit comprises one first coil, one second coil, a rectifier diode and a filter capacitor, this the first coil one end connects the B end of this diode rectifier bridge, the other end connects this ON-OFF control circuit, this the second coil one end is successively via positive pole and the minus earth of the positive pole of this rectifier diode and negative pole, this filter capacitor, its other end ground connection, this rectifier diode and this filter capacitor are used to the voltage commutation filtering that is input to this LED light source circuit.
6. LED power circuit as claimed in claim 5, it is characterized in that: this ON-OFF control circuit comprises a pulse-width modulation circuit and a switching tube, the grid of this switching tube is connected to a control end of this pulse-width modulation circuit, source electrode is connected to the collector electrode of this buffering triode, drain electrode is connected to this first coil, and this pulse-width modulation circuit also connects this feedback circuit.
7. LED power circuit as claimed in claim 6, it is characterized in that: this feedback circuit comprises an optical coupler and a resistance, Schottky diode, the positive pole of this optical coupler is connected to the negative pole of this rectifier diode via this Schottky diode, and connect the power end of this pulse-width modulation circuit, be used to it that operating voltage is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910305942 CN101657057B (en) | 2009-08-21 | 2009-08-21 | LED power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910305942 CN101657057B (en) | 2009-08-21 | 2009-08-21 | LED power circuit |
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| Publication Number | Publication Date |
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| CN101657057A CN101657057A (en) | 2010-02-24 |
| CN101657057B true CN101657057B (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910305942 Expired - Fee Related CN101657057B (en) | 2009-08-21 | 2009-08-21 | LED power circuit |
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| CN101909391B (en) * | 2010-08-10 | 2013-07-31 | 浙江大学 | Phase-controlled dimming LED drive and driving method thereof |
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| CN106332402B (en) * | 2015-07-06 | 2019-05-10 | 通用电气照明解决方案有限公司 | A kind of LED dimming device, LED lamp and LED illumination System |
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| CN107995730B (en) | 2017-11-30 | 2020-01-07 | 昂宝电子（上海）有限公司 | System and method for phase-based control in connection with TRIAC dimmers |
| CN108200685B (en) | 2017-12-28 | 2020-01-07 | 昂宝电子（上海）有限公司 | LED lighting system for silicon controlled switch control |
| CN109922564B (en) | 2019-02-19 | 2023-08-29 | 昂宝电子（上海）有限公司 | Voltage conversion system and method for TRIAC drive |
| CN110493913B (en) | 2019-08-06 | 2022-02-01 | 昂宝电子（上海）有限公司 | Control system and method for silicon controlled dimming LED lighting system |
| CN110831295B (en) | 2019-11-20 | 2022-02-25 | 昂宝电子（上海）有限公司 | Dimming control method and system for dimmable LED lighting system |
| CN110831289B (en) | 2019-12-19 | 2022-02-15 | 昂宝电子（上海）有限公司 | LED drive circuit, operation method thereof and power supply control module |
| CN111031635B (en) | 2019-12-27 | 2021-11-30 | 昂宝电子（上海）有限公司 | Dimming system and method for LED lighting system |
| CN111432526B (en) | 2020-04-13 | 2023-02-21 | 昂宝电子（上海）有限公司 | Control system and method for power factor optimization of LED lighting systems |
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| Publication number | Publication date |
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| CN101657057A (en) | 2010-02-24 |
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