CN101657057A - LED power circuit - Google Patents
LED power circuit Download PDFInfo
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- CN101657057A CN101657057A CN 200910305942 CN200910305942A CN101657057A CN 101657057 A CN101657057 A CN 101657057A CN 200910305942 CN200910305942 CN 200910305942 CN 200910305942 A CN200910305942 A CN 200910305942A CN 101657057 A CN101657057 A CN 101657057A
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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 aworking 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, a kind of specifically 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 all is 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, also exist many problems to hinder the popularization and application of LED illumination in the technical field 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.When the controllable silicon light modulation circuit application of conventional lamp in the LED illuminator because existing LED illuminator adopts the alternating-current switch power supply that constant-current driving is provided usually, 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 instability, 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 feel is very poor when causing light modulation;
Three, power supply and dimmer poor compatibility, even uncomfortable optical phenomenon appears, i.e. brightness changes very little;
Four, controllable silicon dimmer has bigger rush of current, causes the circuit instability, and reliability is lower.
Summary of the invention
Prior art LED power factor is low in order to solve, poor compatibility, problem that reliability is low, is necessary to provide a kind of power factor (PF) height, the compatible good and high LED power circuit of reliability.
A kind of LED power circuit, it is characterized in that: comprise a bridge rectifier, one drive circuit, a transformation rectification circuit, a switching 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 to and keeps this LED power circuit operate as normal, and this transformation rectification circuit is used for providing operating current for this led light source circuit under the control of this switching circuit.This feedback circuit is used for feeding back an operating voltage from this transformation rectification circuit and gives this switching circuit.
In LED power circuit of the present invention, 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, and this first dimming capacitors is connected to this bridge rectifier, and this silicon controlled control end is connected a node between this first dimming resistor and this first dimming capacitors, its input connects civil power L end, and output connects this bridge rectifier.
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 detection control circuit is used to detect the conducting angle of every sine wave period dimmer, carry out removing the control switch circuit after the certain time-delay surge current when this buffer circuit is used to suppress 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 held via the C that this continued flow resistance is connected to this diode rectifier bridge, and 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 first coil, one end connects the B end of this diode rectifier bridge, the other end connects this switching circuit, this second coil, one end is successively via the 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 operate as normal, after the bridge commutating of alternating current by 4 diodes compositions of civil power N end and the input of L end, be input to this switching circuit with afterflow electric capacity, 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 by this pulse-width modulation circuit control, 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, makes to 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 controllable silicon conducting of each sinusoidal period, the conducting in parallel of this first buffer resistance, this buffer capacitor and this buffering triode and this afterflow electric capacity was 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 subjected to rush of current for the forward position light modulation time, thereby make that above-mentioned LED power circuit efficient is 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 specified.
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 to regulate 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 these dimmer 10 operate as normal, 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 giving this ON-OFF control circuit 50 from this transformation rectification circuit 40 feedbacks one operating voltage.
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 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 a 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, and 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 operate as normal, after the bridge commutating of alternating current by 4 diodes compositions of civil power N end and the input of L end, be input to this ON-OFF control circuit 50 with afterflow electric capacity.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 the conducting angle that this detection control circuit 31 is used to detect this dimmer 10 in every sine wave period, and carries out controlling this switching circuit 32 after the certain time-delay.Surge current when this buffer circuit is used to suppress each sine wave period dimmer conduction.In each sine wave period during these dimmer 10 conductings, flow through this rectifier bridge BD1, this afterflow capacitor C x1, this buffer resistance Ry2, this continued flow resistance Rx1 of its transient current constitutes 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 behind the certain hour, be used to control this 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, promptly 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 parallel connection, 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, also can be 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 control output and all can.Switching circuit can be a transistor circuit, also can be the metal-oxide-semiconductor circuit, still can be 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, also can be 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 subjected to rush of current for the forward position light modulation time, thereby make that above-mentioned LED power circuit 1 efficient is higher, compatibility and reliability are higher.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, 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 (8)
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 to keep this LED power circuit to connect traditional dimmers energy circuit operate as normal, 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 feeding back an operating voltage from this transformation rectification circuit and gives this switching circuit.
2. LED power circuit as claimed in claim 1, it is characterized in that: 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 a node between this first dimming resistor and this first dimming capacitors, its input connects civil power L end, and output connects this bridge rectifier.
3. LED power circuit as claimed in claim 2, 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.
4. LED power circuit as claimed in claim 3, it is characterized in that: this drive circuit comprises that one detects control circuit, a switching circuit, a buffer circuit, this detection control circuit is used to detect the conducting angle of every sine wave period dimmer, carry out removing the control switch circuit after the certain time-delay surge current when this buffer circuit is used to suppress each sine wave period dimmer conduction.
5. LED power circuit as claimed in claim 4, 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 held via the C that this continued flow resistance is connected to this diode rectifier bridge, and 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.
6. LED power circuit as claimed in claim 5, it is characterized in that: this transformation rectification circuit comprises one first coil, one second coil, a rectifier diode and a filter capacitor, this first coil, one end connects the B end of this diode rectifier bridge, the other end connects this switching circuit, this second coil, one end is successively via the 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.
7. LED power circuit as claimed in claim 6, 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.
8. LED power circuit as claimed in claim 7, 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910305942 CN101657057B (en) | 2009-08-21 | 2009-08-21 | LED power circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910305942 CN101657057B (en) | 2009-08-21 | 2009-08-21 | LED power circuit |
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| CN101657057A true CN101657057A (en) | 2010-02-24 |
| CN101657057B CN101657057B (en) | 2013-06-05 |
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| CN 200910305942 Expired - Fee Related CN101657057B (en) | 2009-08-21 | 2009-08-21 | LED power circuit |
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