Specific embodiment
With reference to Fig. 2, the led drive circuit that is applicable to controllable silicon light modulation of the present utility model comprises peripheral control unit and led driver, and described led driver comprises rectifier bridge, main circuit, phase angle detection circuit and current control circuit.
With reference to Fig. 3, described adjusting control circuit can adopt isolated form, comprise the low level testing circuit, charge-discharge circuit and peak value keep and signaling conversion circuit, first kind of embodiment, with reference to Fig. 3: described low level testing circuit comprises resistance R 1, R4, diode D1, D2, D4, D5, triode Q2, optocoupler U1, the anode of one terminating diode D1 of the input of described low level testing circuit and the negative electrode of diode D4, the anode of another terminating diode D2 of input and the negative electrode of diode D5, the anode of the anode of diode D4 and diode D5 is connected as former border district, the negative electrode of the negative electrode of diode D1 and diode D2 links to each other and the end of connecting resistance R1, the base stage of another termination triode Q2 of resistance R 1, the emitter of triode Q2 connects former border district, the collector electrode of triode Q2 connects the light-emitting diodes tube cathode of optocoupler U1, the end of the light-emitting diodes tube anode connecting resistance R4 of optocoupler U1, another termination power Vcc of resistance R 4, the phototriode emitter of optocoupler U1 connects output ground, described charge-discharge circuit comprises resistance R 2 and capacitor C 1, the end of the phototriode collector electrode connecting resistance R2 of described optocoupler U1, one end of capacitor C 1 and the anode of diode D3, another termination reference power supply Vref of resistance R 2, another termination output ground of capacitor C 1, described peak value keeps comprising diode D3 with signaling conversion circuit, capacitor C 2, resistance R 3, R5 and triode Q1, the negative electrode of described diode D3 connects an end of capacitor C 2 and an end of resistance R 5, the base stage of another termination triode Q1 of resistance R 5, another termination output ground of C2, the collector electrode of triode Q1 meets reference power supply Vref, the end of the emitter connecting resistance R3 of triode Q1, another termination output ground of resistance R 3, the voltage signal on the resistance R 3 is an output signal.
With reference to Fig. 4, the utility model is based on the main voltage waveform of first kind of execution mode of isolated form adjusting control circuit, and wherein, V1 is an input signal, among the figure shown in the solid line waveform, i.e. and voltage waveform after the copped wave (dotted line is the voltage waveform before the copped wave); V2 is the square-wave signal of low level testing circuit; V3 is the output signal of charge-discharge circuit; V4 is an output signal.
With reference to Fig. 5, described adjusting control circuit can adopt isolated form, second kind of embodiment, keep identical with low level testing circuit and peak value in the described implementation of Fig. 3 with signaling conversion circuit, the implementation of different is charge-discharge circuit is current source I1 and capacitor C 1 parallel connection, realizes discharging and recharging function.
With reference to Fig. 6, described adjusting control circuit adopts isolated form, comprise the low level testing circuit, charge-discharge circuit and peak value keep and signaling conversion circuit, the third embodiment, with reference to Fig. 6: described low level testing circuit comprises resistance R 1, optocoupler U1 and U2, connect with resistance R 1 after the light-emitting diode inverse parallel of described optocoupler U1 and optocoupler U2, the two ends of this connection in series-parallel branch road connect two inputs respectively, the phototriode collector electrode of optocoupler U1 and optocoupler U2 is connected, the emitter of the phototriode of optocoupler U1 and optocoupler U2 all connects output ground, described charge-discharge circuit comprises resistance R 2 and capacitor C 1, the end of the equal connecting resistance R2 of phototriode collector electrode of described optocoupler U1 and optocoupler U2, one end of capacitor C 1 and the anode of diode D3, another termination reference power supply Vref of resistance R 2, another termination output ground of capacitor C 1, described peak value keeps comprising diode D3 with signaling conversion circuit, capacitor C 2, resistance R 3, R5 and triode Q1, the negative electrode of described diode D3 connects an end of capacitor C 2 and an end of resistance R 5, the base stage of another termination triode Q1 of resistance R 5, another termination output ground of C2, the collector electrode of triode Q1 meets reference power supply Vref, the end of the emitter connecting resistance R3 of triode Q1, another termination output ground of resistance R 3, the voltage signal on the resistance R 3 is an output signal.
With reference to Fig. 7, described adjusting control circuit can adopt isolated form, the 4th kind of embodiment, keep identical with low level testing circuit and peak value in the described implementation of Fig. 6 with signaling conversion circuit, the implementation of different is charge-discharge circuit is current source I1 and capacitor C 1 parallel connection, realizes discharging and recharging function.
With reference to Fig. 8, phase-angle detection described in the utility model and current control circuit can adopt isolated form, comprise the low level testing circuit, charge-discharge circuit and peak value keep and signaling conversion circuit, the 5th kind of embodiment, with reference to Fig. 8: described low level testing circuit comprises resistance R 1, diode D1, D2, D4, D5, optocoupler U1, the anode of one terminating diode D1 of the input of described low level testing circuit and the negative electrode of diode D4, the anode of another terminating diode D2 of input and the negative electrode of diode D5, the anode of the anode of diode D4 and diode D5 is connected as former border district, the negative electrode of the negative electrode of diode D1 and diode D2 is connected and the end of connecting resistance R1, the light-emitting diodes tube anode of another termination optocoupler U1 of resistance R 1, the light-emitting diodes tube cathode of optocoupler U1 connects former border district, the phototriode emitter of optocoupler U1 connects output ground, described charge-discharge circuit bag resistance R 2 and capacitor C 1, the end of the phototriode collector electrode connecting resistance R2 of described optocoupler U1, one end of capacitor C 1 and the anode of diode D3, another termination reference power supply Vref of resistance R 2, another termination output ground of capacitor C 1, described peak value keeps comprising diode D3 with signaling conversion circuit, capacitor C 2, resistance R 3, R5 and triode Q1, the negative electrode of described diode D3 connects an end of capacitor C 2 and an end of resistance R 5, the base stage of another termination triode Q1 of resistance R 5, another termination output ground of C2, the collector electrode of triode Q1 meets reference power supply Vref, the end of the emitter connecting resistance R3 of triode Q1, another termination output ground of resistance R 3, the voltage signal on the resistance R 3 is an output signal.
With reference to Fig. 9, described adjusting control circuit can adopt isolated form, the 6th kind of embodiment, keep identical with low level testing circuit and peak value in the described implementation of Fig. 8 with signaling conversion circuit, the implementation of different is charge-discharge circuit is current source I1 and capacitor C 1 parallel connection, realizes discharging and recharging function.
With reference to Figure 10, phase-angle detection described in the utility model and current control circuit can adopt non-isolation type, comprise the low level testing circuit, charge-discharge circuit and peak value keep and signaling conversion circuit, first kind of embodiment, with reference to Figure 10: described low level testing circuit comprises resistance R 1, diode D1, D2, D4, D5, triode Q2, the anode of one terminating diode D1 of the input of described low level testing circuit and the negative electrode of diode D4, the anode of another terminating diode D2 of input and the negative electrode of diode D5, the negative electrode of the negative electrode of diode D4 and diode D5 is connected as ground, the negative electrode of the negative electrode of diode D1 and diode D2 is connected and the end of connecting resistance R1, the base stage of another termination triode Q2 of resistance R 1, the grounded emitter of triode Q2, described charge-discharge circuit comprises resistance R 2 and capacitor C 1, the end of the collector electrode connecting resistance R2 of described triode Q2, one end of capacitor C 1 and the anode of diode D3, another termination reference power supply Vref of resistance R 2, the other end ground connection of capacitor C 1, described peak value keeps comprising diode D3 with signaling conversion circuit, capacitor C 2, resistance R 3, R5 and triode Q1, the negative electrode of described diode D3 connects an end of capacitor C 2 and an end of resistance R 5, the base stage of another termination triode Q1 of resistance R 5, the other end ground connection of C2, the collector electrode of triode Q1 meets reference power supply Vref, the end of the emitter connecting resistance R3 of triode Q1, the other end ground connection of resistance R 3, the voltage signal on the resistance R 3 is an output signal.
With reference to Figure 11, described adjusting control circuit can adopt non-isolation type, second kind of embodiment, keep identical with low level testing circuit and peak value in the described implementation of Figure 10 with signaling conversion circuit, the implementation of different is charge-discharge circuit is current source I1 and capacitor C 1 parallel connection, realizes discharging and recharging function.
With reference to Figure 12, phase-angle detection described in the utility model and current control circuit adopt non-isolation type, comprise the low level testing circuit, charge-discharge circuit and peak value keep and signaling conversion circuit, the third embodiment, with reference to Figure 12, described low level testing circuit comprises resistance R 1, R4, R5, R6, diode D4, D5, triode Q2, Q3, the end of one terminating resistor R5 of the input of described low level testing circuit and the negative electrode of diode D4, the end of the other end connecting resistance R1 of input and the negative electrode of diode D5, the negative electrode of the negative electrode of diode D4 and diode D5 is connected as ground, the base stage of another termination triode Q2 of resistance R 1 and an end of resistance R 4, the grounded emitter of triode Q2, the base stage of another termination triode Q3 of resistance R 5 and an end of resistance R 6, the grounded emitter of triode Q3, the other end ground connection of resistance R 6 and resistance R 4, the collector electrode of triode Q2 and Q3 is connected, described charge-discharge circuit comprises resistance R 2 and capacitor C 1, the end of the collector electrode connecting resistance R2 of described triode Q2 and Q3, one end of capacitor C 1 and the anode of diode D3, another termination reference power supply Vref of resistance R 2, the other end ground connection of capacitor C 1, described peak value keeps comprising diode D3 with signaling conversion circuit, capacitor C 2, resistance R 3, R7 and triode Q1, the negative electrode of described diode D3 connects an end of capacitor C 2 and an end of resistance R 7, the base stage of another termination triode Q1 of resistance R 7, the other end ground connection of C2, the collector electrode of triode Q1 meets reference power supply Vref, the end of the emitter connecting resistance R3 of triode Q1, the other end ground connection of resistance R 3, the voltage signal on the resistance R 3 is an output signal.
With reference to Figure 13, described adjusting control circuit can adopt non-isolation type, the 4th kind of embodiment, keep identical with low level testing circuit and peak value in the described implementation of Figure 12 with signaling conversion circuit, the implementation of different is charge-discharge circuit is current source I1 and capacitor C 1 parallel connection, realizes discharging and recharging function.
With reference to Figure 14, based on a physical circuit figure of the 5th kind of execution mode of isolated form dimming LED drive circuit, specifically:
Line voltage is the input of intensity-scale device, described dimmer comprises unidirectional thyristor SCR, rectifier bridge BD1, resistance R 8, adjustable resistance R9, capacitor C 5, C6, the ac input end of described rectifier bridge BD1 is connected on the zero line, the anode of the forward output termination thyristor SCR of rectifier bridge BD1 and the end of adjustable resistance R9, negative electrode and the capacitor C 5 of the negative sense output termination thyristor SCR of rectifier bridge BD1, the end of C6, the other end of the other end connecting resistance R9 of capacitor C 6 and an end of resistance R 8, the other end of the other end connecting resistance R8 of capacitor C 5 and the control utmost point of thyristor SCR, peripheral control unit is output as the input of rectifier bridge and phase angle detection circuit;
Described adjusting control circuit and Fig. 8 execution mode are basic identical, and distinguishing slightly is that diode D4 among Fig. 8 and D5 omit, this be since among Figure 14 main power rectification bridge can replace diode D4, D5;
The end of the terminating resistor R4 that the output R3 of described adjusting control circuit is connected with triode Q1, the end of the other end connecting resistance R10 of resistance R 4, the reverse input end of electric current loop amplifier IC1, one end of capacitor C 3 and an end of resistance R 6, one end of another termination capacitor C 4 of resistance R 6, the other end of another termination capacitor C 3 of capacitor C 4 and the output of amplifier IC1, the positive input of amplifier IC1 meets reference power supply Vref, the end of the other end connecting resistance R7 of resistance R 10 and the negative terminal of load LED, the input of the output termination Drive and Control Circuit of amplifier IC1.
It is FLYBACK that described LED drives main circuit topology, comprise transformer T1, metal-oxide-semiconductor Q2 and Drive and Control Circuit thereof, diode D4, output electrochemical capacitor C7 and resistance R 7, described transformer T1 primary side non-same polarity connects the rectifier bridge output plus terminal, rectifier bridge output negativing ending grounding, the drain electrode of transformer T1 primary side termination metal-oxide-semiconductor of the same name Q2, the source electrode of Q2 connects rectifier bridge output ground, the grid of Q2 connects the Drive and Control Circuit of metal-oxide-semiconductor, the anode of transformer T1 secondary side terminating diode D4 of the same name, the negative electrode of diode D4 connects anode and the main circuit output plus terminal of electrochemical capacitor C7, the end of the negative terminal connecting resistance R7 of electrochemical capacitor C7, another termination main circuit output negative terminal of resistance R 7.
At last, it is also to be noted that what more than enumerate only is specific embodiment of the utility model.Obviously, the utility model is not limited to above embodiment, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought the protection range of utility model.