CN102665324A - LED linear driving circuit applicable to thyristor dimmer and control method - Google Patents
LED linear driving circuit applicable to thyristor dimmer and control method Download PDFInfo
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- CN102665324A CN102665324A CN2012101061234A CN201210106123A CN102665324A CN 102665324 A CN102665324 A CN 102665324A CN 2012101061234 A CN2012101061234 A CN 2012101061234A CN 201210106123 A CN201210106123 A CN 201210106123A CN 102665324 A CN102665324 A CN 102665324A
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Abstract
The invention discloses an LED linear driving circuit applicable to a thyristor dimmer and a control method. The thyristor dimmer is connected with an input end of the LED linear driving circuit through a rectifier bridge. The LED linear driving circuit is characterized by comprising an LED light string, an LED driver, a voltage sampling network, an absorption control circuit and a current absorption circuit, the LED light string is formed by serially connecting at least one LED, the LED driver comprises N LED driving circuits, each LED driving circuit is connected with cathodes of a group of LED loads so as to control on or off of single or all LED groups, the voltage sampling network is used for detecting output voltage of the rectifier bridge and outputting a signal, the absorption control circuit is used for controlling the current absorption circuit according to the output signal of the voltage sampling network, and the current absorption circuit is used for providing the thyristor dimmer with stable holding current.
Description
Technical field
The present invention relates to a kind of linear led drive circuit, relate in particular to a kind of LED illumination driving circuit and control method that is applicable to silicon controlled dimmer for light control.
Background technology
Fig. 1 is traditional linear constant-current control circuit of LED.LED lamp string 101 is connected to the anode of input rectifying bridge 100 among the figure, through one be connected to input rectifying bridge 100 ground ends led drive circuit 102 set the electric current that flows through LED.LED lamp string 101 can exchange with the position of linear constant-current source 102 each other.
Because LED lamp string 101 is in series by a lot of LED, only when input voltage is higher than LED lamp string 101 forward conduction voltages, LED lamp string 101 is just understood and lighted.In the system of electric main power supply, LED lamp string 101 only just can be lighted near input voltage reaches peak value, so the utilance of LED is very low, power factor is not high yet.If reduce the LED lamp quantity of series connection, though can increase the utilance of LED, the power consumption of led drive circuit 102 is increased greatly, thereby reduce the efficient of whole drive circuit, increase the temperature rise of drive circuit.If the electric current when increase LED lamp string 101 is lighted though can improve the brightness of LED, then need adopt more high-power LED, thereby increase the cost of system, system power dissipation also can increase along with the increase of LED drive current.
Common controllable silicon dimmer is cut or back cut before electric main is carried out, and changes the output voltage effective value and realizes dimming function, and controllable silicon dimmer needs certain keep electric current and could keep stablizing conducting.In conventional incandescent is used, because incandescent lamp is a resistive load, so when cut angle arbitrarily, controllable silicon dimmer can flow through certain electric current.And when controllable silicon dimmer was applied in the led drive circuit, because the LED load is non-linear, load current can all not exist in cut angle arbitrarily, so dimmer often works in abnormal condition, made lamp flicker even can't operate as normal occur.
Summary of the invention
For solving the problems referred to above that prior art exists; The present invention proposes a kind of linear led drive circuit and control method that is applicable to controllable silicon dimmer; Can light part or all of LED through the size of LED electric current according to actual flow on the one hand; Improve the utilance of LED, the luminous efficiency of lamp and power factor; Also designed the current absorption circuit on the other hand, made controllable silicon dimmer reach the effect of stablizing light modulation at any cut angle steady operation.
In order to realize the foregoing invention purpose; The present invention discloses a kind of LED Linear Driving circuit that is applicable to controllable silicon dimmer; This controllable silicon dimmer is connected with the input of this LED Linear Driving circuit through a rectifier bridge; It is characterized in that this LED Linear Driving circuit comprises: a LED lamp string, this LED lamp string is in series by at least one LED; One led driver, said led driver is made up of N led drive circuit, and each led drive circuit connects the negative electrode of one group of LED load, to control single or whole LED group work or to close; One voltage sample network is used to detect the output voltage of this rectifier bridge and exports a signal; One absorbs control circuit, according to the output signal controlling current absorption circuit of this voltage sample network; One current absorption circuit, this current absorption circuit are used to provide this controllable silicon dimmer one stable maintenance electric current.
Further, an input of this rectifier bridge is connected with AC-input voltage, and another input is connected with this controllable silicon dimmer, and this rectifier bridge output plus terminal is connected with the input of this led drive circuit, this rectifier bridge output negativing ending grounding.
Further, this led drive circuit comprises: at least one current sampling resistor, and said current sampling resistor one end ground connection, the other end is connected with an operational amplifier and a multidiameter option switch; One operational amplifier compares the voltage on the current sampling resistor of said each LED respectively with a reference voltage; Output is connected with said multidiameter option switch; One multidiameter option switch, said multidiameter option switch connects said LED respectively, and said multidiameter option switch changes its conduction impedance according to said comparative result, with control section or all LED conductings.
Further, this reference voltage is an equal values, perhaps is different value.
Further; This voltage sample network comprises resistance or the resistance and the electric capacity combination of serial connection up and down; Should go up divider resistance or resistance is connected with this rectifier bridge output cathode with the electric capacity combination; Should go up divider resistance or resistance and be connected the other end ground connection of this time divider resistance or resistance and electric capacity combination with an end of electric capacity combination and the input of this absorption control circuit with following divider resistance or resistance with the other end of electric capacity combination.
Further; This absorption control circuit comprises a comparator or operational amplifier; The in-phase input end of this comparator or operational amplifier is connected with a benchmark voltage; The reverse input end of this comparator or operational amplifier connects this input that absorbs control circuit, and the output of this comparator or operational amplifier connects this output that absorbs control circuit.
Further; This current absorption circuit comprises that a control switch and absorbs network; This absorption network is resistance or resistance and electric capacity combination, and this absorbs network one end and connects this rectifier bridge output cathode, and this absorbs the network other end and connects this control switch input; This control switch output connecting circuit ground, this control switch control end connect this output that absorbs control circuit.
Further, this each led drive circuit and other led drive circuit alternations are perhaps worked simultaneously.
The present invention discloses a kind of LED Linear Driving circuit control method that is applicable to controllable silicon dimmer simultaneously; It is characterized in that; Comprise: a controllable silicon dimmer is connected with the input of a LED Linear Driving circuit through a rectifier bridge; The output voltage of this rectifier bridge of voltage sample network measuring of the LED Linear Driving circuit that is somebody's turn to do is also exported a signal; The absorption control circuit of the LED Linear Driving circuit that is somebody's turn to do is according to this output signal controlling one current absorption circuit; This current absorption circuit provides a stable maintenance electric current to make this controllable silicon dimmer conducting according to the control of this absorption control circuit, and the led drive circuit of this LED Linear Driving circuit is alternately perhaps worked according to this each led drive circuit of the positive terminal voltage decision of this rectifier bridge simultaneously, and the drive current of a LED lamp string is provided.
Compared with prior art, the present invention uses N led drive circuit, according to the size of input voltage instantaneous value, makes the LED load divide into groups to be lighted, thereby improves the utilance and total output lumen number of LED.The present invention has improved the efficient of drive circuit, has increased the power factor of input power supply, has reduced the cost of system.And can regulate LED brightness through changing controllable silicon dimmer cut angular dimension.
Description of drawings
Fig. 1 is traditional linear constant-current control circuit sketch map of LED;
Fig. 2 is the sketch map according to the linear led drive circuit of the compatible silicon controlled dimmer that goes out shown in the present;
Fig. 3 is a kind of implementation method according to the led drive circuit that goes out shown in the present;
Fig. 4 is a kind of implementation method according to the voltage sample network that goes out shown in the present;
Fig. 5 is a kind of implementation method according to the absorption control circuit that goes out shown in the present;
Fig. 6 is a kind of implementation method according to the current absorption circuit that goes out shown in the present.
Embodiment
Specify specific embodiment of the present invention below in conjunction with accompanying drawing.
Traditional LED linear constant current circuit, LED lamp string only just can be lighted near input voltage reaches peak value.
The present invention provides a kind of LED linear current drive circuit; When input voltage is low, just can lights partial L ED, thereby improve the utilance of LED; Open according to the rectifier bridge output voltage signal simultaneously or cut-off current absorption circuit, reach the purpose of compatible silicon controlled dimmer.The present invention is characterised in that, comprising: a LED lamp load, and this LED lamp load is in series by N group LED; One led driver, this led driver is made up of N led drive circuit, to control single or whole LED group work or to close; One voltage sample network is used to detect the rectifier bridge output voltage; One absorbs control circuit, is used for Control current and absorbs circuit; One current absorption circuit is used to provide the electric current of keeping that makes the controllable silicon dimmer steady operation.The present invention can improve LED lamp useful life, improves LED lamp power factor value, improves the LED lamp efficiency, and it is long-pending to dwindle the LED lamp body, compatible silicon controlled dimmer.
Below will combine Fig. 2 to Fig. 6 to specify the present invention.
Fig. 2 is the enforcement circuit of the linear led drive circuit of the compatible silicon controlled dimmer that goes out shown in the present, comprises controllable silicon dimmer 201, rectifier bridge 202, current absorption circuit 203, voltage sample network 204, absorbs control circuit 205, led driver 206, LED load 207.Wherein comprise led drive circuit 1, led drive circuit 2 in the led driver 206 ... Led drive circuit n.Comprise lamp pearl string LED1, LED2 in the LED load 207 ... LEDn.LED1, LED2, LEDn are one or several LED series connection or are formed in parallel.
In the system by the electric main power supply, input voltage is an AC sine wave.After the rectifier bridge rectification, the rectifier bridge output voltage is the absolute value of input ac voltage.Lower at the input voltage instantaneous value, and can not make the lamp pearl string LED1 conducting in the LED load 207 time, LED loads all among the present invention all are in closed condition.Along with the input voltage instantaneous value rises gradually, lamp pearl string LED1 flows through electric current earlier, and led drive circuit 1 is started working.When the input voltage instantaneous value further rises to can make lamp pearl string LED1 with the conducting simultaneously of lamp pearl string LED2 string the time, lamp pearl string LED2 begins to flow through electric current, and led drive circuit 2 is started working, simultaneously led drive circuit 1 entering closed condition.By that analogy, when input voltage reaches can make whole LED loads conducting simultaneously the time, led drive circuit N gets into operating state, and the while, other led drive circuits all got into closed condition.
When the input voltage instantaneous value begins to drop to can not make whole LED loads conducting simultaneously the time; Led drive circuit N gets into closed condition; Simultaneously led drive circuit N-1 gets into conducting state, by that analogy, and when input voltage drops to can not make lamp pearl string LED1 conducting the time; All LED loads all get into closed condition, accomplish the duty cycle of one-period with this.
Fig. 3 is an embodiment of the led drive circuit in the led driver 206, comprises operational amplifier 301, multidiameter option switch 302, current sampling resistor 303.
The input current of led drive circuit flows through current sampling resistor 303; Operational amplifier 301 is compared the voltage on the current sampling resistor 303 with current reference voltage; The control end of the error signal drives multidiameter option switch 302 that produces; The input of multidiameter option switch 302 and the impedance between output are controlled the control of terminal voltage, thereby realize the closed-loop adjustment of led drive circuit electric current.
Fig. 4 is an embodiment of voltage sample network 204, comprises divider resistance 401, following dividing potential drop electric capacity 402, following divider resistance 403.
Fig. 5 is an embodiment who absorbs control circuit 205, comprises comparator 501.
Comparator 501 is compared the output signal of voltage sample network 204 with benchmark voltage, when the output signal of voltage sample network 204 during greater than benchmark voltage, close current absorbs circuit 203; When the output signal of voltage sample network 204 during, open current absorption circuit 203 less than benchmark voltage.Comparator 501 should be designed with certain return difference.
Fig. 6 is an embodiment of current absorption circuit, comprises absorption resistance 601, control switch 602.
Described in this specification is preferred embodiment of the present invention, and above embodiment is only in order to explain technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within scope of the present invention under this invention's idea through the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1. LED Linear Driving circuit that is applicable to controllable silicon dimmer, said controllable silicon dimmer is connected with the input of said LED Linear Driving circuit through a rectifier bridge, it is characterized in that said LED Linear Driving circuit comprises:
One LED lamp string, said LED lamp string is in series by at least one LED;
One led driver, said led driver is made up of N led drive circuit, and each led drive circuit connects the negative electrode of one group of LED load, to control single or whole LED group work or to close;
One voltage sample network is used to detect the output voltage of said rectifier bridge and exports a signal;
One absorbs control circuit, according to the output signal controlling current absorption circuit of said voltage sample network;
One current absorption circuit, said current absorption circuit are used to provide said controllable silicon dimmer one stable maintenance electric current.
2. LED Linear Driving circuit as claimed in claim 1; It is characterized in that; An input of said rectifier bridge is connected with AC-input voltage; Another input is connected with said controllable silicon dimmer, and said rectifier bridge output plus terminal is connected with the input of said led drive circuit, said rectifier bridge output negativing ending grounding.
3. LED Linear Driving circuit as claimed in claim 1 is characterized in that said led drive circuit comprises:
At least one current sampling resistor, said current sampling resistor one end ground connection, the other end is connected with an operational amplifier and a multidiameter option switch;
One operational amplifier compares the voltage on the current sampling resistor of said each LED respectively with a reference voltage; Output is connected with said multidiameter option switch;
One multidiameter option switch, said multidiameter option switch connects said LED respectively, and said multidiameter option switch changes its conduction impedance according to said comparative result, with control section or all LED conductings.
4. LED Linear Driving circuit as claimed in claim 3 is characterized in that said reference voltage is an equal values, perhaps is different value.
5. LED Linear Driving circuit as claimed in claim 1; It is characterized in that; Said voltage sample network comprises resistance or the resistance and the electric capacity combination of serial connection up and down; Said upward divider resistance or resistance are connected with said rectifier bridge output cathode with the electric capacity combination; Said upward divider resistance or resistance are connected the other end ground connection of said divider resistance down or resistance and electric capacity combination with the other end of electric capacity combination with following divider resistance or resistance with an end of electric capacity combination and the input of said absorption control circuit.
6. LED Linear Driving circuit as claimed in claim 1; It is characterized in that; Said absorption control circuit comprises a comparator or operational amplifier; The in-phase input end of said comparator or operational amplifier is connected with a benchmark voltage, and the reverse input end of said comparator or operational amplifier connects the input of said absorption control circuit, and the output of said comparator or operational amplifier connects the output of said absorption control circuit.
7. LED Linear Driving circuit as claimed in claim 1; It is characterized in that said current absorption circuit comprises that a control switch and absorbs network, said absorption network is resistance or resistance and electric capacity combination; Said absorption network one end connects said rectifier bridge output cathode; The said absorption network other end connects said control switch input, said control switch output connecting circuit ground, and said control switch control end connects the output of said absorption control circuit.
8. LED Linear Driving circuit as claimed in claim 1 is characterized in that, said each led drive circuit and other led drive circuit alternations are perhaps worked simultaneously.
9. LED Linear Driving circuit control method that is applicable to controllable silicon dimmer; It is characterized in that; Comprise: a controllable silicon dimmer is connected with the input of a LED Linear Driving circuit through a rectifier bridge; The output voltage of the said rectifier bridge of voltage sample network measuring of described LED Linear Driving circuit is also exported a signal; The absorption control circuit of described LED Linear Driving circuit is according to this output signal controlling one current absorption circuit; Said current absorption circuit provides a stable maintenance electric current to make said controllable silicon dimmer conducting according to the control of said absorption control circuit, and the led drive circuit of said LED Linear Driving circuit is alternately perhaps worked according to said each led drive circuit of the positive terminal voltage decision of said rectifier bridge simultaneously, and the drive current of a LED lamp string is provided.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101061234A CN102665324A (en) | 2012-04-12 | 2012-04-12 | LED linear driving circuit applicable to thyristor dimmer and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101061234A CN102665324A (en) | 2012-04-12 | 2012-04-12 | LED linear driving circuit applicable to thyristor dimmer and control method |
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| CN2012101061234A Pending CN102665324A (en) | 2012-04-12 | 2012-04-12 | LED linear driving circuit applicable to thyristor dimmer and control method |
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Cited By (11)
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| CN103200734A (en) * | 2013-02-20 | 2013-07-10 | 英飞特电子（杭州）股份有限公司 | Method and circuit of reducing current ripple output by current source |
| CN104333934A (en) * | 2013-07-22 | 2015-02-04 | 四川新力光源股份有限公司 | LED illumination driving circuit |
| CN105325061A (en) * | 2013-06-28 | 2016-02-10 | 硅工厂股份有限公司 | LED lighting apparatus and control circuit thereof |
| CN105340367A (en) * | 2013-06-28 | 2016-02-17 | 硅工厂股份有限公司 | Light-emitting diode lighting device and control circuit for same |
| CN105657909A (en) * | 2016-03-25 | 2016-06-08 | 深圳市明微电子股份有限公司 | Linear LED drive circuit capable of achieving light and color adjustment |
| CN106231727A (en) * | 2016-08-05 | 2016-12-14 | 深圳市明微电子股份有限公司 | Produce the method for the stable DC signal of telecommunication, reverse-blocking tetrode thyristor light-dimming method and device |
| CN105407581B (en) * | 2015-12-24 | 2017-04-12 | 上海晶丰明源半导体股份有限公司 | Dimming circuit, dimming chip, dimming system and dimming method thereof |
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| CN103200734B (en) * | 2013-02-20 | 2015-09-02 | 英飞特电子（杭州）股份有限公司 | A kind of method and circuit reducing current ripple output by current source |
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| CN105325061A (en) * | 2013-06-28 | 2016-02-10 | 硅工厂股份有限公司 | LED lighting apparatus and control circuit thereof |
| CN105340367A (en) * | 2013-06-28 | 2016-02-17 | 硅工厂股份有限公司 | Light-emitting diode lighting device and control circuit for same |
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| CN105407581B (en) * | 2015-12-24 | 2017-04-12 | 上海晶丰明源半导体股份有限公司 | Dimming circuit, dimming chip, dimming system and dimming method thereof |
| CN105657909A (en) * | 2016-03-25 | 2016-06-08 | 深圳市明微电子股份有限公司 | Linear LED drive circuit capable of achieving light and color adjustment |
| CN106231727B (en) * | 2016-08-05 | 2017-12-12 | 深圳市明微电子股份有限公司 | Produce method, reverse-blocking tetrode thyristor light-dimming method and the device of stable DC electric signal |
| WO2018023953A1 (en) * | 2016-08-05 | 2018-02-08 | 深圳市明微电子股份有限公司 | Method of generating stable direct current signal, silicon controlled switch dimming method and device |
| CN106231727A (en) * | 2016-08-05 | 2016-12-14 | 深圳市明微电子股份有限公司 | Produce the method for the stable DC signal of telecommunication, reverse-blocking tetrode thyristor light-dimming method and device |
| US10470261B2 (en) | 2016-08-05 | 2019-11-05 | Shenzhen Sunmoon Microelectronics Co., Ltd. | Method of generating stable direct current signal, silicon controlled switch dimming method and device |
| WO2018205454A1 (en) * | 2017-05-09 | 2018-11-15 | 易美芯光（北京）科技有限公司 | Dimmable and color-tunable led light engine module and lighting device |
| CN108449843A (en) * | 2018-05-08 | 2018-08-24 | 杰华特微电子（杭州）有限公司 | A kind of control circuit of lighting circuit, control method and lighting circuit |
| CN109757008A (en) * | 2018-05-08 | 2019-05-14 | 杰华特微电子（杭州）有限公司 | Control circuit, control method and the lighting circuit of lighting circuit |
| CN109757008B (en) * | 2018-05-08 | 2021-06-18 | 杰华特微电子股份有限公司 | Control circuit and control method of lighting circuit and lighting circuit |
| CN112789948A (en) * | 2018-09-28 | 2021-05-11 | 法雷奥照明公司 | Lighting device for motor vehicle |
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Application publication date: 20120912 |