CN103841725B - To release control module, controllable silicon light modulation LED drive circuit and system - Google Patents
To release control module, controllable silicon light modulation LED drive circuit and system Download PDFInfo
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- CN103841725B CN103841725B CN201410077775.9A CN201410077775A CN103841725B CN 103841725 B CN103841725 B CN 103841725B CN 201410077775 A CN201410077775 A CN 201410077775A CN 103841725 B CN103841725 B CN 103841725B
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Abstract
A kind of controllable silicon light modulation LED drive circuit, release switch mos transistor source electrode by one resistance connection circuit ground, its drain electrode is connected to bus voltage signal end by a bleeder resistance, its grid is by one second electric capacity connection circuit ground, and its grid is connected to the output of the first switch of control module of releasing simultaneously by a resistance; First sampling resistor is coupled between the first input end of the comparator of release switch mos transistor and control module of releasing, and obtains the first sampled voltage signal; Control module of releasing receives the first sampled voltage signal by the first input end of comparator, compare with the voltage signal of reference voltage source, control conducting and the disconnection of the first switch, thus drive switch mos transistor of releasing to control the minimum input current of LED drive circuit, and then control the maintenance electric current of controllable silicon dimmer.The present invention, by the Based Intelligent Control of control module of releasing, makes the input current of LED drive circuit meet the demand of controllable silicon dimmer maintenance electric current.
Description
Technical field
The present invention relates to field of LED drive, particularly relate to a kind of control module of releasing, the LED drive circuit of controllable silicon light modulation and system.
Background technology
See 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 is connected a controllable silicon dimmer 102, 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 produces a low-voltage DC makes control chip 104 start.Transformer T1 has three windings, comprises a former limit winding T11, between the drain electrode being connected to capacitor C1 and power switch MOS transistor M1; A vice-side winding T12, is connected between sustained diode 1 and secondary output capacitor C4; An auxiliary winding T13, is connected to 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 detecting 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 divider resistance R4 and R5 usually, is used for detecting controllable silicon cut angle information; A bleeder resistance R1 and one releases switch M2, and when anti exciting converter input current is less, control chip 104 opens the switch M2 that releases, for controllable silicon dimmer 102 provides enough maintenance electric currents.
There are following two shortcomings in above-mentioned traditional flyback LED drive circuit:
1) the switch M2 that releases only has and opens and close two states, the leakage current provided or be greater than the maintenance current needs of controllable silicon dimmer 102, loss LED drive circuit efficiency and temperature rise is higher; Or be less than the maintenance current needs of controllable silicon dimmer 102, cause LED to glimmer or the appearance of light modulation brightness solution situation;
2) when circuit start, the electric current on starting resistance R2 is that electric capacity C2 charges, and when the VCC voltage of electric capacity C2 reaches startup threshold values, LED drive circuit is started working; But this start-up course is comparatively slow, arrange in pairs or groups intelligent controllable silicon dimmer time easily there is the abnormal phenomenon of work.
Summary of the invention
The object of the invention is to, for controllable silicon light modulation LED drive circuit Problems existing in prior art, one is provided to release control module, controllable silicon light modulation LED drive circuit and system, by control module of releasing, electric current on the controlled discharge switch mos transistor of intelligence, make the input current of LED drive circuit meet the demand of controllable silicon dimmer maintenance electric current, achieve effectively simple and compatible good controllable silicon light modulation LED drive circuit.
For achieving the above object, the invention provides one and to release control module, comprise a comparator, a reference voltage source and one first switch; The first input end of described comparator for described in release the input of control module, 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 first switch; The input electricity of described first switch is connected to a supply power voltage signal end, the output of described first switch for described in release the output of control module, its electricity is connected to a grid of releasing switch mos transistor; Controlled conducting and the disconnection of described first switch by the comparative result of described comparator, thus switch mos transistor of releasing described in driving controls the maintenance electric current of controllable silicon dimmer in a LED drive circuit.
For achieving the above object, present invention also offers a kind of controllable silicon light modulation LED drive circuit, comprising: one releases switch mos transistor, one first sampling resistor and a control module of releasing of the present invention; The source electrode of 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 passes through one second electric capacity electricity connecting circuit ground, the output of the first switch of control module of releasing described in its grid is connected to by a resistance electricity simultaneously; Between the first input end of the comparator of switch mos transistor and the described control module of releasing of releasing described in described first sampling resistor is coupled in, for detecting the input current signal of LED drive circuit, obtain the first sampled voltage signal; Described control module of releasing receives described first sampled voltage signal by the first input end of comparator, compare with the voltage signal of reference voltage source, control conducting and the disconnection of described first switch, thus switch mos transistor of releasing described in driving controls the minimum input current of LED drive circuit, and then control the maintenance electric current of the controllable silicon dimmer in LED drive circuit.
Described LED drive circuit comprises a triode and a second switch further; 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 once divider resistance electricity 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 first switch simultaneously; Control described triode ON by described second switch, and then start LED drive circuit, after LED drive circuit starts and then by described second switch, control the disconnection of described triode.
Described LED drive circuit comprises a signal reshape unit further; 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, is controlled the output current size of LED drive circuit by the voltage signal on the 4th electric capacity.
Described LED drive circuit comprises a sample holding unit, an operational amplifier and a logical drive unit further; Described sample holding unit one end is coupled between the source electrode of one second sampling resistor and 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 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 COMP voltage to control the ON time of power switch MOS transistor simultaneously; Described logical drive unit is coupled to described supply power voltage signal end further, 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 for controlling conducting and the closedown of power switch MOS transistor.
For achieving the above object, present invention also offers a kind of controllable silicon light modulation LED drive system, comprise 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, and controls the brightness of LED load by adjusting himself angle of flow; Described rectifier bridge is respectively with described controllable silicon dimmer and exchange input source electricity and be connected, and the sinusoidal signal rectification for exchanging input source is an amplitude is positive bus voltage signal; 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, simultaneously electricity be connected to described in release the first input end of comparator of control module, for detecting 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 control module of releasing described in the auxiliary winding of described transformer to be connected to for electric diode and supply power voltage signal end electricity by; Described control module of releasing receives described first sampled voltage signal by the first input end of comparator, compare with the voltage signal of reference voltage source, control conducting and the disconnection of described first switch, thus switch mos transistor of releasing described in driving controls the minimum input current of LED drive circuit, and then control the maintenance electric current of described controllable silicon dimmer.
Described controllable silicon light modulation LED drive circuit comprises a triode and a second switch further; 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 once divider resistance electricity 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 first switch simultaneously; Control described triode ON by described second switch, and then start LED drive circuit, after LED drive circuit starts and then by described second switch, control the disconnection of described triode.
Described controllable silicon light modulation LED drive circuit comprises a signal reshape unit further; 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, is controlled the output current size of LED drive circuit by the voltage signal on the 4th electric capacity.
Described controllable silicon light modulation LED drive circuit comprises a sample holding unit, an operational amplifier and a logical drive unit further; Described sample holding unit one end is coupled between the source electrode of one second sampling resistor and 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 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 COMP voltage to control the ON time of power switch MOS transistor simultaneously; Described logical drive unit is coupled to the auxiliary winding of described supply power voltage signal end and described transformer further, 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 for controlling conducting and the closedown of power switch MOS transistor.
The invention has the advantages that: by the electric current of releasing on the controlled discharge switch mos transistor of control module intelligence, make the input current of LED drive circuit meet the demand of controllable silicon dimmer maintenance electric current; Provide a kind of Starting mode fast simultaneously, improve the toggle speed of LED drive circuit; Achieve effectively simple and compatible good controllable silicon light modulation LED driver.
Accompanying drawing explanation
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: release switch mos transistor M2, an one first sampling resistor R3 and releases control module 21; Described control module of releasing comprises comparator 204, reference voltage source ref and one first switch S 1.
The source S of the described switch mos transistor M2 that releases is by a resistance R2 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 passes through one second electric capacity C2 electricity connecting circuit ground, the output of the first switch S 1 of control module 21 of releasing described in its grid G is connected to by a resistance R5 electricity simultaneously.Second electric capacity C2 is a resistance R4 in parallel simultaneously.
Described first sampling resistor R3 is coupled between the first input end of release switch mos transistor M2 and comparator 204, for detecting the input current signal of LED drive circuit, obtains the first sampled voltage signal.
The first input end of described comparator 204 for described in release the input of control module 21, 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 first switch S 1.The input electricity of described first switch S 1 is connected to a supply power voltage signal end (VCC end), the output of described first switch S 1 for described in release the output of control module 21, the grid G of the switch mos transistor M2 that releases described in its electricity is connected to.Described control module 21 of releasing receives described first sampled voltage signal by the first input end of comparator 204, compare with the voltage signal of reference voltage source ref, conducting and the disconnection of described first switch S 1 is controlled by the comparative result of described comparator 204, thus the switch mos transistor M2 that releases described in driving controls the minimum input current of LED drive circuit, and then control the maintenance electric current of the controllable silicon dimmer 202 in LED drive circuit.
Also be, when the voltage signal on the first sampling resistor R3 is less than the voltage signal of reference voltage source ref, comparator 204 exports high level, first switch S 1 is opened, the VCC voltage of supply power voltage signal end is that the second electric capacity C2 charges by resistance R5, 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, and wherein Vth is the gate turn-on thresholding of M2.When Vgate rises, voltage Vgate-Vth on resistance R2 also rises thereupon, electric current on resistance R2 also rises thereupon, this electric current flows through the switch mos transistor M2 and bleeder resistance R1 that releases, the input current of LED drive circuit is made to increase, voltage on first sampling resistor R3 also rises, until reach the voltage of reference voltage source ref, makes comparator 204 output switching activity be low level.
By opening and closedown of 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, easily can adjust the minimum input current of LED drive circuit, to meet the demand that controllable silicon dimmer 202 maintains electric current.
Controllable silicon light modulation LED drive circuit of the present invention comprises an a triode Q1 and second switch S2 further, to start LED drive circuit fast.
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 once divider resistance R8 electricity 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 electric capacity C3 electricity connecting circuit ground, and electricity is connected to the input of described 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 by described second switch S2 and disconnect.
Be specially: before LED drive circuit starts, second switch S2 disconnects, the electric current on upper divider resistance R6 flows into the base stage of triode Q1, triode Q1 conducting, and the Vbus voltage of bus voltage signal end is that the 3rd electric capacity C3 charges by supplying resistance R7; When the voltage on the 3rd electric capacity C3 reaches startup threshold values, LED drive circuit is started working.After LED drive circuit starts, second switch S2 closes, and makes the base voltage of triode Q1 lower than the supply power voltage of supply power voltage signal end, and triode Q1 closes, and 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 comprises a signal reshape unit 205 further.
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 electric capacity C4 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 electric capacity C4, controlled the output current size of LED drive circuit by the voltage signal (DIM voltage) on the 4th electric capacity C4.Be specially, after second switch S2 opens, what the voltage signal Vln on lower divider resistance R8 was proportional has reacted Vbus voltage, and therefore Vln signal also can obtain the information of controllable silicon dimmer 202 angle of flow.Vln signal through signal reshape unit 205 shaping and export a square wave current signal give the 4th electric capacity C4, the voltage on the 4th electric capacity C4 is DIM voltage, and the size of DIM voltage then reflects 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 comprises sample holding unit 208, operational amplifier 206 and a logical drive unit 207 further.
Described sample holding unit 208 one end is coupled between the source S of one second sampling resistor R11 and a power switch MOS transistor M1, for obtaining one second sampled voltage signal; Described sample holding unit 208 other end electricity is 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 electric capacity C4, for obtaining described DIM voltage signal.The output of described operational amplifier 206 is by one the 5th electric capacity C5 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 COMP voltage to control the ON time of power switch MOS transistor M1 simultaneously.Described logical drive unit 207 is coupled to described supply power voltage signal end further 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, and described logical drive unit 207 is for controlling conducting and the closedown of power switch MOS transistor M1.
Be specially, operational amplifier 206 receives the signal on the second sampling resistor R11 of being transmitted by sample holding unit 208, and DIM voltage signal, export COMP voltage signal, the size of COMP voltage determines the ON time (close moment) of power switch MOS transistor M1.When voltage drop to zero on divider resistance R10, logical drive unit 207 now (opens the moment) 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 controllable silicon dimmer 202, rectifier bridge 203, 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, and controls the brightness of LED load by adjusting himself angle of flow.Described rectifier bridge 203 is respectively with described controllable silicon dimmer 202 and exchange input source 201 electricity and be connected, and the sinusoidal signal rectification for exchanging input source 201 is an amplitude is positive Vbus voltage signal.Main winding T1-P one end of transformer T1 is connected to 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; Namely the anode of sustained diode 2 is connected to the drain D of power switch MOS transistor M1, and the negative terminal of sustained diode 2 connects output capacitance C6 and LED load; Bus voltage signal end is connected to after output capacitance C6 and LED load parallel connection.The input of the first switch S 1 of control module 21 of releasing described in the auxiliary winding T1-S of transformer T1 to be connected to for electric diode D1 and supply power voltage signal end electricity by.Transformer T1 energy storage when power switch MOS transistor M1 opens, is discharged into energy in LED load and by being discharged in electric capacity C3 for electric diode D1 by sustained diode 2 when power switch MOS transistor M1 closes.
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, simultaneously electricity be connected to described in release the first input end of comparator 204 of control module 21, for detecting the input current signal of LED drive circuit, obtain the first sampled voltage signal.Described control module 21 of releasing receives described first sampled voltage signal by the first input end of comparator 204, compare with the voltage signal of reference voltage source ref, conducting and the disconnection of described first switch S 1 is controlled according to comparative result, thus switch mos transistor of releasing described in driving controls the minimum input current of LED drive circuit, and then control the maintenance electric current of described controllable silicon dimmer 202.
The operation principle of described control module 21 of releasing is see Fig. 2 and corresponding description thereof, by the comparator 204 of described control module 21 of releasing and opening and closedown 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, easily can adjust the minimum input current of LED drive circuit, to meet the demand that controllable silicon dimmer 202 maintains electric current.
The type of drive of controllable silicon light modulation LED drive system of the present invention to existing drive circuit have also been made improvement, improves the toggle speed of LED drive circuit, achieves effectively simple and compatible good controllable silicon light modulation LED drive circuit.Described controllable silicon light modulation LED drive circuit comprises an a triode Q1 and second switch S2 further.
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 electric capacity C3 electricity connecting circuit ground, and electricity is connected to the input of described first switch S 1 simultaneously.Control described triode Q1 conducting by described second switch S2, and then start LED drive circuit; Start afterwards at LED drive circuit and then control described triode Q1 by described second switch and disconnect.
Be specially: before LED drive circuit starts, second switch S2 disconnects, the electric current on upper divider resistance R6 flows into the base stage of triode Q1, triode Q1 conducting, and the Vbus voltage of bus voltage signal end is that the 3rd electric capacity C3 charges by supplying resistance R7; When the voltage on the 3rd electric capacity C3 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 by supplying electric diode D1 to be that supply power voltage signal end is powered.After LED drive circuit starts, second switch S2 closes, and makes the base voltage of triode Q1 lower than the supply power voltage of supply power voltage signal end, and triode Q1 closes, and 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 comprises a signal reshape unit 205 further.
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 electric capacity C4 electricity connecting circuit ground.Described signal reshape unit 205, for the voltage signal shaping of input is exported a square wave current signal to the 4th electric capacity C4, controls the output current size of LED drive circuit by voltage signal on the 4th electric capacity C4.Be specially, after second switch S2 opens, what the voltage signal Vln on lower divider resistance R8 was proportional has reacted Vbus voltage, and therefore Vln signal also can obtain the information of controllable silicon dimmer 202 angle of flow.Vln signal through signal reshape unit 205 shaping and export a square wave current signal give the 4th electric capacity C4, the voltage on the 4th electric capacity C4 is DIM voltage, and the size of DIM voltage then reflects 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, by improving the type of drive of existing drive circuit, improves the toggle speed of LED drive circuit.
As preferred embodiment, described controllable silicon light modulation LED drive circuit comprises sample holding unit 208, operational amplifier 206 and a logical drive unit 207 further.
Described sample holding unit 208 one end is coupled between the source S of one second sampling resistor R11 and a power switch MOS transistor M1, for obtaining one second sampled voltage signal; Described sample holding unit 208 other end electricity is 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 electric capacity C4, for obtaining described DIM voltage signal.The output of described operational amplifier 206 is by one the 5th electric capacity C5 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 COMP voltage to control the ON time of power switch MOS transistor M1 simultaneously.Described logical drive unit 207 is coupled to the auxiliary winding T1-S of described supply power voltage signal end and described transformer T1 further, 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, and described logical drive unit 207 is for controlling conducting and the closedown of power switch MOS transistor M1.
Be specially, operational amplifier 206 receives the signal on the second sampling resistor R11 of being transmitted by sample holding unit 208, and DIM voltage signal, export COMP voltage signal, the size of COMP voltage determines the ON time (close moment) of power switch MOS transistor M1.When voltage drop to zero on auxiliary winding T1-S, illustrate that the electric current of transformer T1 also drops to zero, then the voltage on divider resistance R10 also drops to zero, and logical drive unit 207 now (opens the moment) 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, DIM voltage and COMP voltage keep substantially constant, so the service time of power switch MOS transistor M1 keeps substantially constant, and Vbus voltage is sine wave shape, then 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 on the maintenance electric current of the controllable silicon dimmer 202 of LED drive circuit, as shown in the maintenance 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 on the maintenance electric current of controllable silicon dimmer 202 by 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 be obtained by adjustment 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 drive 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 drive system 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 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 (8)
1. a controllable silicon light modulation LED drive circuit, is characterized in that, comprising: release switch mos transistor, one first sampling resistor and is released control module;
Described control module of releasing comprises a comparator, a reference voltage source and one first switch; The first input end of described comparator for described in release the input of control module, 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 first switch; The input electricity of described first switch is connected to a supply power voltage signal end, the output of described first switch for described in release the output of control module, its electricity is connected to a grid of releasing switch mos transistor; Controlled conducting and the disconnection of described first switch by the comparative result of described comparator, thus switch mos transistor of releasing described in driving controls the maintenance electric current of controllable silicon dimmer in a LED drive circuit;
The source electrode of 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 passes through one second electric capacity electricity connecting circuit ground, the output of the first switch of control module of releasing described in its grid is connected to by a resistance electricity simultaneously;
Between the first input end of the comparator of switch mos transistor and the described control module of releasing of releasing described in described first sampling resistor is coupled in, for detecting the input current signal of LED drive circuit, obtain the first sampled voltage signal;
Described control module of releasing receives described first sampled voltage signal by the first input end of comparator, compare with the voltage signal of reference voltage source, control conducting and the disconnection of described first switch, thus switch mos transistor of releasing described in driving controls the minimum input current of LED drive circuit, and then control the maintenance electric current of the controllable silicon dimmer in LED drive circuit.
2. controllable silicon light modulation LED drive circuit according to claim 1, is characterized in that, described LED drive circuit comprises a triode and a second switch further; 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 once divider resistance electricity 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 first switch simultaneously; Control described triode ON by described second switch, and then start LED drive circuit, after LED drive circuit starts and then by described second switch, control the disconnection of described triode.
3. controllable silicon light modulation LED drive circuit according to claim 2, is characterized in that, described LED drive circuit comprises a signal reshape unit further; 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, is controlled the output current size of LED drive circuit by the voltage signal on the 4th electric capacity.
4. controllable silicon light modulation LED drive circuit according to claim 3, is characterized in that, described LED drive circuit comprises a sample holding unit, an operational amplifier and a logical drive unit further; Described sample holding unit one end is coupled between the source electrode of one second sampling resistor and 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 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 COMP voltage to control the ON time of power switch MOS transistor simultaneously; Described logical drive unit is coupled to described supply power voltage signal end further, 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 for controlling conducting and the closedown of power switch MOS transistor.
5. 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, comprises controllable silicon light modulation LED drive circuit according to claim 1 further;
Described controllable silicon dimmer and one exchanges input source electricity and is connected, and controls the brightness of LED load by adjusting himself angle of flow;
Described rectifier bridge is respectively with described controllable silicon dimmer and exchange input source electricity and be connected, and the sinusoidal signal rectification for exchanging input source is an amplitude is positive bus voltage signal;
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, simultaneously electricity be connected to described in release the first input end of comparator of control module, for detecting 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 power switch MOS transistor, the input of the first switch of control module of releasing described in the auxiliary winding of described transformer to be connected to for electric diode and supply power voltage signal end electricity by;
Described control module of releasing receives described first sampled voltage signal by the first input end of comparator, compare with the voltage signal of reference voltage source, control conducting and the disconnection of described first switch, thus switch mos transistor of releasing described in driving controls the minimum input current of LED drive circuit, and then control the maintenance electric current of described controllable silicon dimmer.
6. controllable silicon light modulation LED drive system according to claim 5, is characterized in that, described controllable silicon light modulation LED drive circuit comprises a triode and a second switch further; 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 once divider resistance electricity 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 first switch simultaneously; Control described triode ON by described second switch, and then start LED drive circuit, after LED drive circuit starts and then by described second switch, control the disconnection of described triode.
7. controllable silicon light modulation LED drive system according to claim 6, is characterized in that, described controllable silicon light modulation LED drive circuit comprises a signal reshape unit further; 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, is controlled the output current size of LED drive circuit by the voltage signal on the 4th electric capacity.
8. controllable silicon light modulation LED drive system according to claim 7, is characterized in that, described controllable silicon light modulation LED drive circuit comprises a sample holding unit, an operational amplifier and a logical drive unit further; Described sample holding unit one end is coupled between the source electrode of one second sampling resistor and described 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 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 COMP voltage to control the ON time of power switch MOS transistor simultaneously; Described logical drive unit is coupled to the auxiliary winding of described supply power voltage signal end and described transformer further, 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 for controlling conducting and the closedown of power switch MOS transistor.
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