CN103841725A - Bleeding control module and silicon-controlled dimming LED drive circuit and system - Google Patents
Bleeding control module and silicon-controlled dimming LED drive circuit and system Download PDFInfo
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- CN103841725A CN103841725A CN201410077775.9A CN201410077775A CN103841725A CN 103841725 A CN103841725 A CN 103841725A CN 201410077775 A CN201410077775 A CN 201410077775A CN 103841725 A CN103841725 A CN 103841725A
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Abstract
The invention provides a silicon-controlled dimming LED drive circuit. The source electrode of a bleeding switch MOS transistor is connected with the circuit ground through a resistor, the drain electrode of the bleeding switch MOS transistor is connected to the voltage signal end of a bus through a bleeding resistor, and the grid electrode of the bleeding switch MOS transistor is connected with the circuit ground through a second capacitor and is also connected with the output end of a first switch of a bleeding control module through a resistor. A first sampling resistor is coupled between the bleeding switch MOS transistor and the first input end of a comparator of the bleeding control module so as to obtain a first sampling voltage signal. The bleeding control module receives the first sampling voltage signal through the first input end of the comparator, compares the first sampling voltage signal with the voltage signal of a reference voltage source and controls switching-on and switching-off of the first switch, so that the bleeding switch MOS transistor is driven to control the minimum input current of the LED drive circuit, and therefore the holding current of a silicon-controlled dimmer is controlled. Through the intelligent control by the bleeding control module, the input current of the LED drive circuit can meet the requirement for the holding current of the silicon-controlled dimmer.
Description
Technical field
The present invention relates to LED and drive field, relate in particular to LED drive circuit and the system of a kind of control module of releasing, controllable silicon light modulation.
Background technology
Referring to Fig. 1, the rough schematic view of the controllable silicon light modulation LED drive circuit of prior art.As shown in Figure 1, input AC AC power 101 controllable silicon dimmer 102 of connecting, is connected to two inputs of rectifier bridge 103.Rectifier bridge 103 by after AC rectification through capacitor C1 filtering, produce the sinusoidal voltage after a rectification.Starting resistance R2 and capacitor C2 produce a low-voltage DC starts control chip 104.Transformer T1 has three windings, comprises a former limit winding T11, is connected between capacitor C1 and the drain electrode of power switch MOS transistor M1; A secondary winding T12, is connected between sustained diode 1 and secondary output capacitor C4; An auxiliary winding T13, is connected in between electric diode D2 and circuit ground.When after circuit start, auxiliary winding T13 is that control chip 104 is powered; Auxiliary winding T13 also provides the information that detects sustained diode 1 current over-zero and detect output voltage overvoltage simultaneously.The controllable silicon light modulation LED drive circuit of prior art also comprises a pair of divider resistance R4 and R5 conventionally, is used for detecting controllable silicon cut angle information; A bleeder resistance R1 and the switch M2 that releases, when anti exciting converter input current hour, control chip 104 is opened the switch M2 that releases, for controllable silicon dimmer 102 provides enough electric currents that maintains.
In above-mentioned traditional flyback LED drive circuit, there are following two shortcomings:
1) the switch M2 that releases only has and opens and close two states, the leakage current providing or be greater than the electric current demand that maintains of controllable silicon dimmer 102, and loss LED drive circuit efficiency and temperature rise are higher; Or be less than the electric current demand that maintains of controllable silicon dimmer 102, cause the flicker of LED lamp or light modulation brightness solution situation to occur;
2) in the time of circuit start, the electric current on starting resistance R2 is that capacitor C 2 is charged, and in the time that the VCC of capacitor C 2 voltage reaches startup threshold values, LED drive circuit is started working; But this start-up course is comparatively slow, while arranging in pairs or groups intelligent controllable silicon dimmer, easily there is the abnormal phenomenon of work.
Summary of the invention
The object of the invention is to, the problem existing for controllable silicon light modulation LED drive circuit in prior art, one release control module, controllable silicon light modulation LED drive circuit and system are provided, by the control module of releasing, electric current on the controlled discharge switch mos transistor of intelligence, the demand that makes the input current of LED drive circuit meet controllable silicon dimmer to maintain electric current, has realized effectively simple and compatible good controllable silicon light modulation LED drive circuit.
For achieving the above object, the invention provides the one control module of releasing, comprise a comparator, a reference voltage source and one first switch; Release described in the being input of control module of the first input end of described comparator, be used for receiving one first sampled voltage signal, its second input is connected with the output electricity of described reference voltage source, and the output electricity of described comparator is connected to the control end of described the first switch; The input electricity of described the first switch is connected to a supply power voltage signal end, release described in the being output of control module of the output of described the first switch, and its electricity is connected to a grid of releasing switch mos transistor; By conducting and the disconnection of the first switch described in the comparative result control of described comparator, thus the controllable silicon dimmer in switch mos transistor control one LED drive circuit of releasing described in driving maintain electric current.
For achieving the above object, the present invention also provides a kind of controllable silicon light modulation LED drive circuit, comprising: release switch mos transistor, one first sampling resistor and the control module of releasing of the present invention; The source electrode of the described switch mos transistor of releasing is by a resistance electricity connecting circuit ground, its drain electrode is connected to bus voltage signal end by a bleeder resistance electricity, its grid is by one second electric capacity electricity connecting circuit ground, the output of the first switch of the control module of releasing described in its grid is connected to by a resistance electricity simultaneously; Described in described the first sampling resistor is coupled in, release switch mos transistor and described in release between the first input end of comparator of control module, for detection of the input current signal of LED drive circuit, obtain the first sampled voltage signal; The described control module of releasing receives described the first sampled voltage signal by the first input end of comparator, voltage signal comparison with reference voltage source, control conducting and the disconnection of described the first switch, thereby described in driving, release the minimum input current of switch mos transistor control LED drive circuit, and then control the electric current that maintains of controllable silicon dimmer in LED drive circuit.
Described LED drive circuit further comprises a triode and a second switch; The base stage of described triode is connected to described bus voltage signal end by divider resistance electricity on one, is connected to described second switch by divider resistance electricity once simultaneously; The collector electrode of described triode is connected to described bus voltage signal end by a supplying resistance electricity; The emitter of described triode is by supply power voltage signal end and one the 3rd electric capacity electricity connecting circuit ground, and electricity is connected to the input of described the first switch simultaneously; By triode conducting described in described second switch control, and then start LED drive circuit, after LED drive circuit starts and then by triode described in described second switch control, disconnect.
Described LED drive circuit further comprises a signal reshape unit; The input of described signal reshape unit is coupled between described upper divider resistance and lower divider resistance, its output is by one the 4th electric capacity electricity connecting circuit ground, described signal reshape unit is used for the voltage signal shaping of input and exports a square wave current signal to the 4th electric capacity, by the output current size of the voltage signal control LED drive circuit on the 4th electric capacity.
Described LED drive circuit further comprises a sample holding unit, an operational amplifier and a logical drive unit; Described sample holding unit one end is coupled between one second sampling resistor and the source electrode of a power switch MOS transistor, and for obtaining one second sampled voltage signal, described sample holding unit other end electricity is connected to an input of described operational amplifier; Another input of described operational amplifier is coupled between described signal reshape unit and the 4th electric capacity, for obtaining the voltage signal on described the 4th electric capacity; The output of described operational amplifier is by one the 5th electric capacity electricity connecting circuit ground, be connected to the grid of power switch MOS transistor by described logical drive unit electricity, for exporting the ON time of COMP voltage with power ratio control switch mos transistor simultaneously; Described logical drive unit is further coupled to described supply power voltage signal end, simultaneously by another resistance electricity connecting circuit ground, the drain electrode of described power switch MOS transistor is coupled to LED load, and described logical drive unit is used for the conducting of power ratio control switch mos transistor and closes.
For achieving the above object, the present invention also provides a kind of controllable silicon light modulation LED drive system, comprises a controllable silicon dimmer, a rectifier bridge, a bus capacitor, a transformer and controllable silicon light modulation LED drive circuit of the present invention; Described controllable silicon dimmer and one exchanges input source electricity and is connected, by adjusting the brightness of himself angle of flow control LED load; Described rectifier bridge is respectively with described controllable silicon dimmer and exchange input source electricity and is connected, for being that an amplitude is positive bus voltage signal by the sinusoidal signal rectification of interchange input source; Described first sampling resistor one end is connected to described bus voltage signal end by described bus capacitor electricity, other end electricity is connected to an output of described rectifier bridge, the first input end of the comparator of the control module of releasing described in while electricity is connected to, for detection of the input current signal of LED drive circuit, obtain the first sampled voltage signal; The main winding of described transformer connects the drain electrode of described bus voltage signal end and described power switch MOS transistor, the input of the first switch of the control module of releasing described in the auxiliary winding of described transformer is connected to by a confession electric diode and supply power voltage signal end electricity; The described control module of releasing receives described the first sampled voltage signal by the first input end of comparator, voltage signal comparison with reference voltage source, control conducting and the disconnection of described the first switch, thereby described in driving, release the minimum input current of switch mos transistor control LED drive circuit, and then control the electric current that maintains of described controllable silicon dimmer.
Described controllable silicon light modulation LED drive circuit further comprises a triode and a second switch; The base stage of described triode is connected to described bus voltage signal end by divider resistance electricity on one, is connected to described second switch by divider resistance electricity once simultaneously; The collector electrode of described triode is connected to described bus voltage signal end by a supplying resistance electricity; The emitter of described triode is by supply power voltage signal end and one the 3rd electric capacity connecting circuit ground, and electricity is connected to the input of described the first switch simultaneously; By triode conducting described in described second switch control, and then start LED drive circuit, after LED drive circuit starts and then by triode described in described second switch control, disconnect.
Described controllable silicon light modulation LED drive circuit further comprises a signal reshape unit; The input of described signal reshape unit is coupled between described upper divider resistance and lower divider resistance, its output is by one the 4th electric capacity electricity connecting circuit ground, described signal reshape unit is used for the voltage signal shaping of input and exports a square wave current signal to the 4th electric capacity, by the output current size of the voltage signal control LED drive circuit on the 4th electric capacity.
Described controllable silicon light modulation LED drive circuit further comprises a sample holding unit, an operational amplifier and a logical drive unit; Described sample holding unit one end is coupled between one second sampling resistor and the source electrode of a power switch MOS transistor, and for obtaining one second sampled voltage signal, described sample holding unit other end electricity is connected to an input of described operational amplifier; Another input of described operational amplifier is coupled between described signal reshape unit and the 4th electric capacity, for obtaining the voltage signal on described the 4th electric capacity; The output of described operational amplifier is by one the 5th electric capacity electricity connecting circuit ground, be connected to the grid of power switch MOS transistor by described logical drive unit electricity, for exporting the ON time of COMP voltage with power ratio control switch mos transistor simultaneously; Described logical drive unit is further coupled to the auxiliary winding of described supply power voltage signal end and described transformer, simultaneously by another resistance electricity connecting circuit ground, the drain electrode of described power switch MOS transistor is coupled to LED load, and described logical drive unit is used for the conducting of power ratio control switch mos transistor and closes.
The invention has the advantages that: by the electric current on the controlled discharge switch mos transistor of the control module intelligence of releasing, make the input current of LED drive circuit meet controllable silicon dimmer to maintain the demand of electric current; A kind of quick Starting mode is provided simultaneously, has improved the toggle speed of LED drive circuit; Realize effectively simple and compatible good controllable silicon light modulation LED driver.
Brief description of the drawings
Fig. 1, the rough schematic view of the controllable silicon light modulation LED drive circuit of prior art;
Fig. 2, the configuration diagram of controllable silicon light modulation LED drive circuit of the present invention;
Fig. 3, the schematic diagram of buck-boost type controllable silicon light modulation LED drive system of the present invention;
Fig. 4, the startup waveform schematic diagram of buck-boost type controllable silicon light modulation LED drive system of the present invention;
Fig. 5, the work wave schematic diagram of buck-boost type controllable silicon light modulation LED drive system of the present invention;
Fig. 6, the schematic diagram of flyback controllable silicon light modulation LED drive system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, controllable silicon light modulation LED drive circuit provided by the invention and system are elaborated.
With reference to figure 2, the configuration diagram of controllable silicon light modulation LED drive circuit of the present invention, described drive circuit comprises: switch mos transistor M2, an one first sampling resistor R3 and control module 21 of releasing of releasing; The described control module of releasing comprises a comparator 204, a reference voltage source ref and one first switch S 1.
The source S of the described switch mos transistor M2 that releases is by resistance R 2 electricity connecting circuit ground, its drain D is connected to bus voltage signal end (Vbus end) by a bleeder resistance R1 electricity, its grid G is by one second capacitor C 2 electricity connecting circuit ground, the output of the first switch S 1 of the control module 21 of releasing described in its grid G is connected to by resistance R 5 electricity simultaneously.The second capacitor C 2 resistance R 4 in parallel simultaneously.
Described the first sampling resistor R3 is coupled in and releases between switch mos transistor M2 and the first input end of comparator 204, for detection of the input current signal of LED drive circuit, obtains the first sampled voltage signal.
Release described in the being input of control module 21 of the first input end of described comparator 204, be used for receiving the first sampled voltage signal, its second input is connected with the output electricity of described reference voltage source ref, and the output electricity of described comparator 204 is connected to the control end of described the first switch S 1.The input electricity of described the first switch S 1 is connected to a supply power voltage signal end (VCC end), release described in the being output of control module 21 of the output of described the first switch S 1, the grid G of the switch mos transistor M2 that releases described in its electricity is connected to.The described control module 21 of releasing receives described the first sampled voltage signal by the first input end of comparator 204, voltage signal comparison with reference voltage source ref, by conducting and the disconnection of the first switch S 1 described in the comparative result control of described comparator 204, thereby the switch mos transistor M2 that releases described in driving controls the minimum input current of LED drive circuit, and then control the electric current that maintains of controllable silicon dimmer 202 in LED drive circuit.
Also be, in the time that the voltage signal on the first sampling resistor R3 is less than the voltage signal of reference voltage source ref, comparator 204 is exported high level, the first switch S 1 is opened, the VCC voltage of supply power voltage signal end is that the second capacitor C 2 is charged by resistance R 5, and the grid voltage Vgate of the switch mos transistor M2 that makes to release rises.The source voltage of switch mos transistor M2 of releasing is about Vgate-Vth, the gate turn-on thresholding that wherein Vth is M2.In the time that Vgate rises, voltage Vgate-Vth in resistance R 2 also rises thereupon, electric current in resistance R 2 also rises thereupon, this electric current switch mos transistor M2 and bleeder resistance R1 of releasing that flow through, make the input current of LED drive circuit increase, voltage on the first sampling resistor R3 also rises, until reach the voltage of reference voltage source ref, making comparator 204 output switching activities is low level.
Opening and closing by comparator 204 and the first switch S 1, forming an input current closed loop makes the input current of LED drive circuit be about the voltage/resistance R3 of reference voltage source ref, by adjusting the size of the first sampling resistor R3 value, can easily adjust the minimum input current of LED drive circuit, maintain the demand of electric current to meet controllable silicon dimmer 202.
Controllable silicon light modulation LED drive circuit of the present invention further comprises a triode Q1 and a second switch S2, to start fast LED drive circuit.
The base stage of described triode Q1 is connected to described bus voltage signal end by divider resistance R6 electricity on one, is connected to described second switch S2, the other end connection circuit ground of second switch S2 by divider resistance R8 electricity once simultaneously; The collector electrode of triode Q1 is connected to described bus voltage signal end by a supplying resistance R7 electricity; The emitter of triode Q1 is by supply power voltage signal end and one the 3rd capacitor C 3 electricity connecting circuit ground, and electricity is connected to the input of described the first switch S 1 simultaneously.Control described triode Q1 conducting by described second switch S2, and then start LED drive circuit; After LED drive circuit starts, and then control described triode Q1 disconnection by described second switch S2.
Be specially: before LED drive circuit starts, second switch S2 disconnects, and the electric current on upper divider resistance R6 flows into the base stage of triode Q1, triode Q1 conducting, the Vbus voltage of bus voltage signal end is that the 3rd capacitor C 3 is charged by supplying resistance R7; In the time that the voltage in the 3rd capacitor C 3 reaches startup threshold values, LED drive circuit is started working.After LED drive circuit starts, second switch S2 closure, makes the base voltage of triode Q1 lower than the supply power voltage of supply power voltage signal end, and triode Q1 closes, and on supplying resistance R7, does not have electric current to flow through, and reduces system loss.
As preferred embodiment, described controllable silicon light modulation LED drive circuit further comprises a signal reshape unit 205.
The input of described signal reshape unit 205 is coupled between described upper divider resistance R6 and lower divider resistance R8, and its output is by one the 4th capacitor C 4 electricity connecting circuit ground.Described signal reshape unit 205, for by the voltage signal shaping of input and export a square wave current signal to the 4th capacitor C 4, is controlled the output current size of LED drive circuit by the voltage signal in the 4th capacitor C 4 (DIM voltage).Be specially, after second switch S2 opens, the proportional Vbus voltage that reacted of voltage signal Vln on lower divider resistance R8, therefore Vln signal also can obtain the information of controllable silicon dimmer 202 angle of flows.Vln signal passes through signal reshape unit 205 shapings and exports a square wave current signal is DIM voltage to the voltage in the 4th capacitor C 4, the four capacitor C 4, and the size of DIM voltage has reflected controllable silicon dimmer angle of flow.DIM voltage is for controlling the output current size of LED drive circuit.
As preferred embodiment, described controllable silicon light modulation LED drive circuit further comprises a sample holding unit 208, an operational amplifier 206 and a logical drive unit 207.
Described sample holding unit 208 one end are coupled between one second sampling resistor R11 and the source S of a power switch MOS transistor M1, for obtaining one second sampled voltage signal; Described sample holding unit 208 other end electricity are connected to an input of described operational amplifier 206.Another input of described operational amplifier 206 is coupled between described signal reshape unit 205 and the 4th capacitor C 4, for obtaining described DIM voltage signal.The output of described operational amplifier 206 is by one the 5th capacitor C 5 electricity connecting circuit ground, be connected to the grid G of power switch MOS transistor M1 by described logical drive unit 207 electricity, for exporting the ON time of COMP voltage with power ratio control switch mos transistor M1 simultaneously.Described logical drive unit 207 is further coupled to described supply power voltage signal end by a divider resistance R9 and for electric diode D1, simultaneously by another divider resistance R10 electricity connecting circuit ground, the drain D of described power switch MOS transistor M1 is coupled to LED load, described logical drive unit 207 for the conducting of power ratio control switch mos transistor M1 with close.
Be specially, operational amplifier 206 receives the signal on the second sampling resistor R11 transmitting by sample holding unit 208, and DIM voltage signal, output COMP voltage signal, the size of COMP voltage has determined the ON time (close moment) of power switch MOS transistor M1.In the time of voltage drop to zero on divider resistance R10, the moment now (is opened) in logical drive unit 207 makes power switch MOS transistor M1 again open-minded.
Below in conjunction with accompanying drawing 3-5, the operation principle of buck-boost type controllable silicon light modulation LED drive system of the present invention is described.
With reference to figure 3, the schematic diagram of buck-boost type controllable silicon light modulation LED drive system of the present invention.Described controllable silicon light modulation LED drive system comprises a controllable silicon dimmer 202, a rectifier bridge 203, a bus capacitor C1, a transformer T1 and controllable silicon light modulation LED drive circuit (circuit as shown in Figure 2 of the present invention, same components symbol represents same or similar assembly), the present invention improves existing drive circuit control mode.
Described controllable silicon dimmer 202 and one exchanges input source 201 electricity and is connected, by adjusting the brightness of himself angle of flow control LED load.Described rectifier bridge 203 is respectively with described controllable silicon dimmer 202 and exchange input source 201 electricity and is connected, for being that an amplitude is positive Vbus voltage signal by the sinusoidal signal rectification of interchange input source 201.Main winding T1-P one end of transformer T1 is connected in bus capacitor C1 and described bus voltage signal end, and the other end connects the drain D of power switch MOS transistor M1, is coupled to LED load by sustained diode 2 simultaneously; Be the drain D that the anode of sustained diode 2 is connected in power switch MOS transistor M1, the negative terminal of sustained diode 2 connects output capacitance C6 and LED load; After output capacitance C6 and LED load parallel connection, be connected to bus voltage signal end.The input of the first switch S 1 of the control module 21 of releasing described in the auxiliary winding T1-S of transformer T1 is connected to by a confession electric diode D1 and supply power voltage signal end electricity.Transformer T1 energy storage in the time that power switch MOS transistor M1 opens, in the time that power switch MOS transistor M1 closes, energy is discharged into LED load by sustained diode 2 in and by being discharged in capacitor C 3 for electric diode D1.
Described first sampling resistor R3 one end is connected to bus voltage signal end by described bus capacitor C1 electricity, other end electricity is connected to an output of described rectifier bridge 203, the first input end of the comparator 204 of the control module 21 of releasing described in while electricity is connected to, for detection of the input current signal of LED drive circuit, obtain the first sampled voltage signal.The described control module 21 of releasing receives described the first sampled voltage signal by the first input end of comparator 204, voltage signal comparison with reference voltage source ref, according to conducting and the disconnection of the first switch S 1 described in comparative result control, thereby described in driving, release the minimum input current of switch mos transistor control LED drive circuit, and then control the electric current that maintains of described controllable silicon dimmer 202.
The operation principle of the described control module 21 of releasing is referring to Fig. 2 and corresponding description thereof, by the comparator 204 of the described control module 21 of releasing and opening and closing of the first switch S 1, forming an input current closed loop makes the input current of LED drive circuit be about the voltage/resistance R3 of reference voltage source ref, by adjusting the size of the first sampling resistor R3 value, can easily adjust the minimum input current of LED drive circuit, maintain the demand of electric current to meet controllable silicon dimmer 202.
Controllable silicon light modulation LED drive system of the present invention is also improved the type of drive of existing drive circuit, has improved the toggle speed of LED drive circuit, has realized effectively simple and compatible good controllable silicon light modulation LED drive circuit.Described controllable silicon light modulation LED drive circuit further comprises a triode Q1 and a second switch S2.
The base stage of described triode Q1 is connected to described bus voltage signal end by upper divider resistance R6 electricity, is connected to described second switch S2 by lower divider resistance R8 electricity simultaneously, the other end connection circuit ground of second switch S2; The collector electrode of triode Q1 is connected to described bus voltage signal end by a supplying resistance R7 electricity; The emitter of triode Q1 is by supply power voltage signal end and one the 3rd capacitor C 3 electricity connecting circuit ground, and electricity is connected to the input of described the first switch S 1 simultaneously.Control described triode Q1 conducting by described second switch S2, and then start LED drive circuit; After LED drive circuit starts and then by triode Q1 described in described second switch control, disconnect.
Be specially: before LED drive circuit starts, second switch S2 disconnects, and the electric current on upper divider resistance R6 flows into the base stage of triode Q1, triode Q1 conducting, the Vbus voltage of bus voltage signal end is that the 3rd capacitor C 3 is charged by supplying resistance R7; In the time that the voltage in the 3rd capacitor C 3 reaches startup threshold values, LED drive circuit is started working.After LED drive circuit is started working, the auxiliary winding T1-S of transformer T1 is the power supply of supply power voltage signal end by supplying electric diode D1.After LED drive circuit starts, second switch S2 closure, makes the base voltage of triode Q1 lower than the supply power voltage of supply power voltage signal end, and triode Q1 closes, and on supplying resistance R7, does not have electric current to flow through, and reduces system loss.
As preferred embodiment, described controllable silicon light modulation LED drive circuit further comprises a signal reshape unit 205.
The input of described signal reshape unit 205 is coupled between described upper divider resistance R6 and lower divider resistance R8, and its output is by one the 4th capacitor C 4 electricity connecting circuit ground.Described signal reshape unit 205 for by the voltage signal shaping of input and export a square wave current signal give the 4th capacitor C 4, by the output current size of the voltage signal control LED drive circuit in the 4th capacitor C 4.Be specially, after second switch S2 opens, the proportional Vbus voltage that reacted of voltage signal Vln on lower divider resistance R8, therefore Vln signal also can obtain the information of controllable silicon dimmer 202 angle of flows.Vln signal passes through signal reshape unit 205 shapings and exports a square wave current signal is DIM voltage to the voltage in the 4th capacitor C 4, the four capacitor C 4, and the size of DIM voltage has reflected controllable silicon dimmer angle of flow.DIM voltage is for controlling the output current size of LED drive circuit.The startup waveform of the controllable silicon light modulation LED drive system of buck-boost type of the present invention as shown in Figure 4, improves by the type of drive to existing drive circuit, has improved the toggle speed of LED drive circuit.
As preferred embodiment, described controllable silicon light modulation LED drive circuit further comprises a sample holding unit 208, an operational amplifier 206 and a logical drive unit 207.
Described sample holding unit 208 one end are coupled between one second sampling resistor R11 and the source S of a power switch MOS transistor M1, for obtaining one second sampled voltage signal; Described sample holding unit 208 other end electricity are connected to an input of described operational amplifier 206.Another input of described operational amplifier 206 is coupled between described signal reshape unit 205 and the 4th capacitor C 4, for obtaining described DIM voltage signal.The output of described operational amplifier 206 is by one the 5th capacitor C 5 electricity connecting circuit ground, be connected to the grid G of power switch MOS transistor M1 by described logical drive unit 207 electricity, for exporting the ON time of COMP voltage with power ratio control switch mos transistor M1 simultaneously.Described logical drive unit 207 is further coupled to the auxiliary winding T1-S of described supply power voltage signal end and described transformer T1, simultaneously by another divider resistance R10 electricity connecting circuit ground; Be specially, logical drive unit 207 is coupled to described supply power voltage signal end by divider resistance R9 and for electric diode D1, and is connected to the auxiliary winding T1-S of transformer T1 by divider resistance R9 electricity.The drain D of described power switch MOS transistor M1 is coupled to LED load, described logical drive unit 207 for the conducting of power ratio control switch mos transistor M1 with close.
Be specially, operational amplifier 206 receives the signal on the second sampling resistor R11 transmitting by sample holding unit 208, and DIM voltage signal, output COMP voltage signal, the size of COMP voltage has determined the ON time (close moment) of power switch MOS transistor M1.In the time of voltage drop to zero on auxiliary winding T1-S, illustrate that the electric current of transformer T1 also drops to zero, the voltage on divider resistance R10 also drops to zero, and the moment now (is opened) in logical drive unit 207 makes power switch MOS transistor M1 again open-minded.
The work wave of the controllable silicon light modulation LED drive system of buck-boost type of the present invention as shown in Figure 5.Due in a power frequency period, it is substantially constant that DIM voltage and COMP voltage keep, so it is substantially constant that the service time of power switch MOS transistor M1 keeps, and Vbus voltage is sine wave shape, the peak current envelope of transformer T1 is also sinusoidal shape, as shown in dotted line in transformer current signal in Fig. 5.The input current of LED drive circuit is also sinusoidal shape, and the input current minimum value of LED drive circuit maintains the maintaining on electric current of controllable silicon dimmer 202 of LED drive circuit, as maintaining as shown in electric current dotted line of controllable silicon dimmer in Fig. 5.Also be, the controllable silicon light modulation LED drive system that the present invention proposes makes the input current minimum value of LED drive circuit maintain maintaining on electric current of controllable silicon dimmer 202 by the control module Based Intelligent Control of the releasing switch mos transistor M2 that releases, and ensures the normal work of controllable silicon dimmer.The extinction current of controllable silicon dimmer 202 can obtain by adjusting the first sampling resistor R3 and reference voltage source ref.
Controllable silicon light modulation LED drive circuit of the present invention can be applied in flyback controllable silicon light modulation LED driving system structure equally.With reference to figure 6, the schematic diagram of flyback controllable silicon light modulation LED drive system of the present invention.Wherein, the LED of buck-boost type controllable silicon light modulation shown in the drive principle of controllable silicon light modulation LED drive circuit and control logic and Fig. 3 drive system is similar, does not repeat them here.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the control module of releasing, is characterized in that, comprises a comparator, a reference voltage source and one first switch;
Release described in the being input of control module of the first input end of described comparator, be used for receiving one first sampled voltage signal, its second input is connected with the output electricity of described reference voltage source, and the output electricity of described comparator is connected to the control end of described the first switch;
The input electricity of described the first switch is connected to a supply power voltage signal end, release described in the being output of control module of the output of described the first switch, and its electricity is connected to a grid of releasing switch mos transistor;
By conducting and the disconnection of the first switch described in the comparative result control of described comparator, thus the controllable silicon dimmer in switch mos transistor control one LED drive circuit of releasing described in driving maintain electric current.
2. a controllable silicon light modulation LED drive circuit, is characterized in that, comprising: release switch mos transistor, one first sampling resistor and the control module of releasing claimed in claim 1;
The source electrode of the described switch mos transistor of releasing is by a resistance electricity connecting circuit ground, its drain electrode is connected to bus voltage signal end by a bleeder resistance electricity, its grid is by one second electric capacity electricity connecting circuit ground, the output of the first switch of the control module of releasing described in its grid is connected to by a resistance electricity simultaneously;
Described in described the first sampling resistor is coupled in, release switch mos transistor and described in release between the first input end of comparator of control module, for detection of the input current signal of LED drive circuit, obtain the first sampled voltage signal;
The described control module of releasing receives described the first sampled voltage signal by the first input end of comparator, voltage signal comparison with reference voltage source, control conducting and the disconnection of described the first switch, thereby described in driving, release the minimum input current of switch mos transistor control LED drive circuit, and then control the electric current that maintains of controllable silicon dimmer in LED drive circuit.
3. controllable silicon light modulation LED drive circuit according to claim 2, is characterized in that, described LED drive circuit further comprises a triode and a second switch;
The base stage of described triode is connected to described bus voltage signal end by divider resistance electricity on one, is connected to described second switch by divider resistance electricity once simultaneously; The collector electrode of described triode is connected to described bus voltage signal end by a supplying resistance electricity; The emitter of described triode is by supply power voltage signal end and one the 3rd electric capacity electricity connecting circuit ground, and electricity is connected to the input of described the first switch simultaneously;
By triode conducting described in described second switch control, and then start LED drive circuit, after LED drive circuit starts and then by triode described in described second switch control, disconnect.
4. controllable silicon light modulation LED drive circuit according to claim 3, is characterized in that, described LED drive circuit further comprises a signal reshape unit;
The input of described signal reshape unit is coupled between described upper divider resistance and lower divider resistance, its output is by one the 4th electric capacity electricity connecting circuit ground, described signal reshape unit is used for the voltage signal shaping of input and exports a square wave current signal to the 4th electric capacity, by the output current size of the voltage signal control LED drive circuit on the 4th electric capacity.
5. controllable silicon light modulation LED drive circuit according to claim 4, is characterized in that, described LED drive circuit further comprises a sample holding unit, an operational amplifier and a logical drive unit;
Described sample holding unit one end is coupled between one second sampling resistor and the source electrode of a power switch MOS transistor, and for obtaining one second sampled voltage signal, described sample holding unit other end electricity is connected to an input of described operational amplifier; Another input of described operational amplifier is coupled between described signal reshape unit and the 4th electric capacity, for obtaining the voltage signal on described the 4th electric capacity; The output of described operational amplifier is by one the 5th electric capacity electricity connecting circuit ground, be connected to the grid of power switch MOS transistor by described logical drive unit electricity, for exporting the ON time of COMP voltage with power ratio control switch mos transistor simultaneously; Described logical drive unit is further coupled to described supply power voltage signal end, simultaneously by another resistance electricity connecting circuit ground, the drain electrode of described power switch MOS transistor is coupled to LED load, and described logical drive unit is used for the conducting of power ratio control switch mos transistor and closes.
6. a controllable silicon light modulation LED drive system, comprises a controllable silicon dimmer, a rectifier bridge, a bus capacitor and a transformer, it is characterized in that, further comprises controllable silicon light modulation LED drive circuit claimed in claim 2;
Described controllable silicon dimmer and one exchanges input source electricity and is connected, by adjusting the brightness of himself angle of flow control LED load;
Described rectifier bridge is respectively with described controllable silicon dimmer and exchange input source electricity and is connected, for being that an amplitude is positive bus voltage signal by the sinusoidal signal rectification of interchange input source;
Described first sampling resistor one end is connected to described bus voltage signal end by described bus capacitor electricity, other end electricity is connected to an output of described rectifier bridge, the first input end of the comparator of the control module of releasing described in while electricity is connected to, for detection of the input current signal of LED drive circuit, obtain the first sampled voltage signal;
The main winding of described transformer connects the drain electrode of described bus voltage signal end and described power switch MOS transistor, the input of the first switch of the control module of releasing described in the auxiliary winding of described transformer is connected to by a confession electric diode and supply power voltage signal end electricity;
The described control module of releasing receives described the first sampled voltage signal by the first input end of comparator, voltage signal comparison with reference voltage source, control conducting and the disconnection of described the first switch, thereby described in driving, release the minimum input current of switch mos transistor control LED drive circuit, and then control the electric current that maintains of described controllable silicon dimmer.
7. controllable silicon light modulation LED drive system according to claim 6, is characterized in that, described controllable silicon light modulation LED drive circuit further comprises a triode and a second switch;
The base stage of described triode is connected to described bus voltage signal end by divider resistance electricity on one, is connected to described second switch by divider resistance electricity once simultaneously; The collector electrode of described triode is connected to described bus voltage signal end by a supplying resistance electricity; The emitter of described triode is by supply power voltage signal end and one the 3rd electric capacity connecting circuit ground, and electricity is connected to the input of described the first switch simultaneously; By triode conducting described in described second switch control, and then start LED drive circuit, after LED drive circuit starts and then by triode described in described second switch control, disconnect.
8. controllable silicon light modulation LED drive system according to claim 7, is characterized in that, described controllable silicon light modulation LED drive circuit further comprises a signal reshape unit;
The input of described signal reshape unit is coupled between described upper divider resistance and lower divider resistance, its output is by one the 4th electric capacity electricity connecting circuit ground, described signal reshape unit is used for the voltage signal shaping of input and exports a square wave current signal to the 4th electric capacity, by the output current size of the voltage signal control LED drive circuit on the 4th electric capacity.
9. controllable silicon light modulation LED drive system according to claim 8, is characterized in that, described controllable silicon light modulation LED drive circuit further comprises a sample holding unit, an operational amplifier and a logical drive unit;
Described sample holding unit one end is coupled between one second sampling resistor and the source electrode of a power switch MOS transistor, and for obtaining one second sampled voltage signal, described sample holding unit other end electricity is connected to an input of described operational amplifier; Another input of described operational amplifier is coupled between described signal reshape unit and the 4th electric capacity, for obtaining the voltage signal on described the 4th electric capacity; The output of described operational amplifier is by one the 5th electric capacity electricity connecting circuit ground, be connected to the grid of power switch MOS transistor by described logical drive unit electricity, for exporting the ON time of COMP voltage with power ratio control switch mos transistor simultaneously; Described logical drive unit is further coupled to the auxiliary winding of described supply power voltage signal end and described transformer, simultaneously by another resistance electricity connecting circuit ground, the drain electrode of described power switch MOS transistor is coupled to LED load, and described logical drive unit is used for the conducting of power ratio control switch mos transistor and closes.
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