CN105611684A - Circuit for realizing light modulation via power switch and lamp - Google Patents
Circuit for realizing light modulation via power switch and lamp Download PDFInfo
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- CN105611684A CN105611684A CN201510754624.7A CN201510754624A CN105611684A CN 105611684 A CN105611684 A CN 105611684A CN 201510754624 A CN201510754624 A CN 201510754624A CN 105611684 A CN105611684 A CN 105611684A
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Abstract
The invention discloses a circuit for realizing light modulation via a power switch and a lamp. The circuit comprises a power supply module, a power conversion module, an input voltage detection module, a discharge module and a power supply voltage state analyzing module. When the power supply module is switched off, the second power supply end of the power supply module is discharged by the discharge module, so that a second power supply voltage output by the power supply module is decreased from normal work voltage to stop voltage rapidly, and a light source is prevented from flickering caused by discharge by an internal capacitor. When the power switch is closed and the second power supply voltage is increased from the stop voltage to the start voltage, the power supply voltage state analyzing module outputs a light modulation control signal to the power conversion module to adjust the voltage of the light source. When the second power supply voltage is greater than the first voltage and lower than the start voltage, the discharge module carries out discharging on the second power supply end of the power supply module in the first current. After that the power switch is disconnected, a charging current formed by residual voltage of the capacitor is electrolyzed, and mis-start caused by that the residual voltage is higher than the start voltage is prevented.
Description
Technical field
The present invention relates to Switching Power Supply LED and drive field, particularly a kind of circuit that utilizes power switch to realize light modulationAnd light fixture.
Background technology
It is long that LED has the life-span as lighting source, pollution-free, and luminous efficiency high is in general illumination and decorative lightingBe used widely Deng numerous areas, but traditional on power line serial connection controllable silicon light modulator light-dimming method and be not suitable forFor common LED lighting, even if specially treated makes the LED light fixture can compatible silicon controlled light modulation, for existing without stringThe regular tap of connection controllable silicon dimmer, wants to realize dimming function and must rearrange connecting line, and complexity is installed, and cost is high.
Prior art " a kind of LED dimming driving circuit " (CN201310176350.9) proposes one and drives by detecting LEDQuick disconnection and the ON Action of the VCCPIN voltage change indirect monitoring power switch of moving control chip, then by controlling ICState machine and logic processing module realize sectional dimming function. This technology can facilitate on the basis that increases hardly costThe brightness adjustment control to LED is realized on ground, but has two serious shortcomings. The first, for resetting time of being grown is (as 4Second), this invention need to reduce the operating current of IC after VCC≤Vstop, and VCC descending slope is reduced. But electrochemical capacitorAfter repid discharge, can have residual voltage Vin (remain) and VCC electric capacity is charged, charging current is Istart=(Vin(remain)-Vcc)/Rst, when the operating current Iop of IC less, while meeting Iop < Istart, even if switch is again not closedAlso can cause VCC voltage to rise to Von, IC erroneous judgement is that switch closed action causes light modulation mistake; The second, the reset of light fixtureTime (Δ t3) precision is low. Because Δ t3 by VCC capacitor's capacity, IC operating current Iop and input capacitance residual voltage by openingMoving resistance R st determines jointly to the charging current Istart electric current of VCC, affected by peripheral condition element larger. With singleWhen the identical independent LED power supply of the multiple specifications of switch control, tend to occur asynchronously cause that light modulation is nonsynchronous owing to resettingProblem.
Visible, prior art need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide one to utilize power switch to realize and adjustThe circuit of light and light fixture, reach and utilize regular tap to realize the object to the sectional-regulated brightness of light source, has without increasing extraCost, reliability is high, the feature of high conformity.
In order to achieve the above object, the present invention has taked following technical scheme:
Utilize power switch to realize a circuit for light modulation, comprising:
Be provided with the supply module of power switch, described power switch is for controlling the opening and closing of supply module;
Described supply module has the first feeder ear and the second feeder ear, and described the first feeder ear is used for exporting the first supply voltageGive power transfer module; Described the second feeder ear is used for exporting the second supply voltage to supply voltage state analyzing module;
Power transfer module, for being converted to the first supply voltage the operating voltage of light source;
Input voltage detection module, in the time that supply module is closed, triggers second feeder ear of discharge module to supply moduleDischarge, make the second supply voltage of supply module quickly fall to and stop voltage from normal working voltage;
Discharge module, discharges for the second feeder ear to supply module;
Supply voltage state analyzing module, for detection of the second supply voltage of supply module, mould disconnects, powers at power switchThe second supply voltage of piece when stopping voltage, powered-down modular converter and discharge module; In power switch closure, power supplyWhen the second supply voltage of module rises to starting resistor from stopping voltage, output dimming control signal arrives power transfer module,Export to the voltage of light source to regulate power transfer module; At the second supply voltage of supply module higher than the first voltage and lowIn the time of starting resistor, discharge module is discharged to the second feeder ear of supply module with the first electric current;
Described the first electric current is greater than after power switch disconnection, the charged electrical that the electrochemical capacitor residual voltage in supply module formsStream; The described voltage that stops is less than the first voltage, and described the first voltage is less than starting resistor;
The first feeder ear of described supply module connects power transfer module, described in the second feeder ear of described supply module passes throughSupply voltage state analyzing module connects power transfer module, and the output of described supply voltage state analyzing module is by inputVoltage detection module connects the first control end of discharge module, and described supply voltage state analyzing module connects described discharge moduleThe second control end, the input of described discharge module connects the second feeder ear of described supply module.
The described power switch that utilizes is realized in the circuit of light modulation, and described supply voltage state analyzing module comprises that state dividesAnalyse unit, state machine and output current control module;
The second supply voltage of described state analysis unit inspection supply module, at the second supply voltage of supply module higher than passPower-off is pressed and while exceeding the scheduled time lower than the duration of starting resistor, state machine is resetted, and makes state machine once upperWhile powering on, enter the first state; Described state analysis unit disconnects at power switch, the second supply voltage of supply module lower thanWhile stopping voltage, close discharge module, and by output current control module powered-down modular converter; Described state analysis listUnit rises to starting resistor from stopping voltage at the second supply voltage of power switch closure, supply module, changes state machineState, described state machine, according to the control of state analysis unit, is exported corresponding status signal to output current control module,Described output current control module converts status signal to dimming control signal and outputs to power transfer module, to regulate power supplyModular converter is exported to the voltage of light source; Described state analysis unit at the second supply voltage of supply module higher than the first voltageAnd during lower than starting resistor, make discharge module second feeder ear electric discharge to supply module with the first electric current.
The described power switch that utilizes is realized in the circuit of light modulation, and described state analysis unit comprises the first comparator,One hysteresis loop comparator, the second hysteresis loop comparator, timer, first and door, second with and not gate; Second of described supply moduleFeeder ear connects normal phase input end, second hysteresis loop comparator of normal phase input end, first hysteresis loop comparator of the first comparatorThe input of normal phase input end and discharge module, the inverting input of described the first comparator connects shutoff voltage providing end, instituteState the first comparator output connection timer first input end and first and door first input end, described timerOutput connect after oppositely first with the second input of door, described first with the reset terminal of the output connect state machine of door,Visiting of described the first hysteresis loop comparator is limited to starting resistor, Xiamen is limited to and stops voltage; Described the first hysteresis loop comparator defeatedGo out to hold the second input, the clock signal input terminal of state machine and the input of not gate of connection timer, described not gate defeatedGo out end connect second with the first input end of door, the visiting of described the second hysteresis loop comparator is limited to the first voltage, Xiamen and is limited to theTwo voltages, the output of described the second hysteresis loop comparator connect second with the second input of door, described second with the output of doorEnd connects the second control end of described discharge module; Described shutoff voltage < second voltage < stops voltage < the first voltage < and opensMoving voltage.
The described power switch that utilizes is realized in the circuit of light modulation, and described supply module also comprises:
AC power, for providing alternating current;
Rectification filtering unit, for carrying out rectification and filtering to alternating current;
Power supply unit, for to the described circuit supply that utilizes power switch to realize light modulation;
Described AC power connects the input of rectification filtering unit, the output of described rectification filtering unit by power switchFor the first feeder ear, the connection input of power supply unit and the input of power transfer module of supply module, described power supply listThe output of unit second feeder ear that is supply module, the normal phase input end that connects the first comparator, the first hysteresis loop comparatorThe normal phase input end of normal phase input end, the second hysteresis loop comparator and the input of discharge module.
The described power switch that utilizes is realized in the circuit of light modulation, and described power supply unit comprises the first resistance, the first electric capacityAnd Zener diode; One end of described the first resistance is the input of power supply unit, the output of connection rectification filtering unit, instituteThe output that the other end of stating the first resistance is power supply unit, the one end that connects the first electric capacity, the negative pole, first of Zener diodeThe normal phase input end of the normal phase input end of comparator, the normal phase input end of the first hysteresis loop comparator, the second hysteresis loop comparator and puttingThe input of electricity module; The other end ground connection of described the first electric capacity, the plus earth of described Zener diode.
The described power switch that utilizes is realized in the circuit of light modulation, and described discharge module comprises the first current source, the second electricityStream source, the first switch and second switch, input, connection the first current source that the negative pole of described the second current source is discharge moduleNegative pole and the other end of the first resistance, the positive pole of described the second current source is by second switch ground connection, described second switchControl end is the output of the second control end, connection second and the door of discharge module; The positive pole of described the first current source is by theOne switch ground connection, the first control end that the control end of described the first switch is discharge module, connects input voltage detection moduleOutput.
The described power switch that utilizes is realized in the circuit of light modulation, and described power transfer module comprises the first diode,Two electric capacity and inductance, input that the negative pole of described the first diode is power transfer module, connect the defeated of rectification filtering unitGo out end, one end of the first resistance and one end of the second electric capacity, the positive pole of described the first diode connects output current control moduleOutput and one end of inductance, the other end of described inductance connects the other end of the second electric capacity, one end of described the second electric capacityFor the output cathode of power transfer module, the output negative pole that the other end of described the second electric capacity is power transfer module.
The described power switch that utilizes is realized in the circuit of light modulation, and described output current control module comprises power switchPipe, the second resistance, the second comparator, also comprise:
Signal is processed subelement, exports to power switch driven element unit for status signal being converted to dimming control signal;
Power switch driven element unit, for according to described dimming control signal, exports the pwm signal of different duty to powerThe grid of switching tube;
The input that described signal is processed subelement is the input of output current control module, the output of connect state machine,Described signal is processed the first output of subelement by the grid of power switch driven element unit connection power switch pipe, described inThe second output of signal processing subelement connects the inverting input of the second comparator, and the output of described the second comparator connectsConnect signal and process the feedback input end of subelement, the source electrode of described power switch pipe connect the second comparator normal phase input end,The input of input voltage detection module, also by the second resistance eutral grounding, the drain electrode of described power switch pipe is output current controlOutput, the connection positive pole of the first diode and one end of inductance of unit processed.
The described power switch that utilizes is realized in the circuit of light modulation, and described rectification filtering unit comprises rectifier bridge and the 3rd electricityHold, the output cathode of described rectifier bridge connects the negative pole and the of one end, first diode of one end, first resistance of the 3rd electric capacityOne end of two electric capacity, the output negative pole ground connection of described arrangement bridge, the other end ground connection of described the 3rd electric capacity.
A kind of light fixture, comprises light source, also comprises the circuit that utilizes power switch to realize light modulation as above.
Compared to prior art, a kind of circuit and light fixture that utilizes power switch to realize light modulation provided by the invention, described inCircuit comprises supply module, power transfer module, input voltage detection module, discharge module and supply voltage state analysis mouldPiece. The present invention, by input voltage detection module, in the time that supply module is closed, triggers discharge module and supplies second of supply moduleThe electric discharge of electricity end, makes the second supply voltage of supply module output quickly fall to and stop voltage from normal working voltage, in avoidingThe light source scintillation that portion's capacitor charge and discharge causes. Supply voltage state analyzing module is exported at power switch closure, supply moduleWhen the second supply voltage rises to starting resistor from stopping voltage, output dimming control signal is to power transfer module, to regulateThe voltage of light source, like this, by quick disconnection and the closure of power switch, has realized light modulation. In the second power supply of supply moduleVoltage is during higher than the first voltage and lower than starting resistor, and supply voltage state analyzing module makes discharge module with the first electric current pairSupply module discharges; Wherein, described the first electric current is greater than after power switch disconnection, the electrochemical capacitor remnants in supply moduleThe charging current that voltage forms, the error starting of having avoided residual voltage to cause higher than starting resistor.
Brief description of the drawings
Fig. 1 is the structured flowchart that utilizes power switch to realize the circuit of light modulation provided by the invention.
Fig. 2 is the circuit diagram that utilizes power switch to realize the circuit of light modulation provided by the invention.
Fig. 3 is provided by the invention utilization in the circuit that power switch realizes light modulation, the voltage waveform of each important nodeFigure.
Fig. 4 is provided by the invention utilization in the circuit that power switch realizes light modulation, the view of state machine.
Fig. 5 is provided by the invention utilization in the circuit that power switch realizes light modulation, the output of power switch driven element unitThe pwm signal oscillogram corresponding with power switch pipe source voltage Vcs.
Fig. 6 is provided by the invention utilization in the circuit that power switch realizes light modulation, the power transfer module of embodiment 2Circuit diagram.
Fig. 7 is provided by the invention utilization in the circuit that power switch realizes light modulation, the power transfer module of embodiment 3Circuit diagram.
Fig. 8 is that the power switch that utilizes shown in embodiment 4 is realized the circuit of light modulation.
Fig. 9 is that the power switch that utilizes shown in embodiment 4 is realized in the circuit of light modulation, the voltage waveform of each important nodeFigure.
Detailed description of the invention
The invention provides a kind of circuit and light fixture that utilizes power switch to realize light modulation, for making object of the present invention, technologyScheme and effect are clearer, clear and definite, and developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment. Should manageSeparate, specific embodiment described herein only, in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, the circuit that utilizes power switch to realize light modulation provided by the invention, comprise supply module 10,Supply voltage state analyzing module 20, power transfer module 30, input voltage detection module 40 and discharge module 50.
Described supply module 10, for power supply, concrete, be used to the whole circuit that utilizes power switch to realize light modulation to carryFor powered by direct current, in described supply module 10, be provided with power switch S1, described power switch S1 is used for controlling supply module10 opening and closing, that is, the power supply that described power switch S1 can control supply module 10 whether. Described supply module 10 hasThe first feeder ear g1 and the second feeder ear g2, described the first feeder ear g1 is used for exporting the first supply voltage Vin to be changed to power supplyModule 30; Described the second feeder ear g2 is used for exporting the second supply voltage VCC to supply voltage state analyzing module 20. DescribedOne feeder ear g1 is electrically connected with described the second feeder ear g2 by a resistance.
Described supply voltage state analyzing module 20, for detection of the second supply voltage VCC of supply module 10, at power supplySwitch S 1 disconnects, the second supply voltage VCC of supply module 10 when stopping voltage Vstop, powered-down modular converter 30With discharge module 50; The second supply voltage VCC at power switch S1 closure, supply module 10 rises from stopping voltage VstopDuring to starting resistor Von, output dimming control signal often rises to one-shot voltage Von to power transfer module 30(, changesA dimming control signal), to regulate power transfer module 30 to export to the voltage of light source; In the second power supply of supply module 10Voltage VCC is during higher than the first voltage Vhigh and lower than starting resistor Von, make discharge module 50 with the first electric current to power supply mouldThe second feeder ear g2 of piece 10 discharges. Wherein, described the first electric current is greater than after power switch S1 disconnection, in supply module 10Electrochemical capacitor residual voltage form charging current; Certainly, described the first electric current can not exceed after power switch S1 closure, suppliesThe electric current of electricity module 10 normal outputs. The described voltage Vstop that stops is less than the first voltage Vhigh, and described the first voltage Vhigh is littleIn starting resistor Von.
Described power transfer module 30, for being converted to the first supply voltage Vin the operating voltage of light source.
Described input voltage detection module 40, for detection of the first supply voltage Vin of described supply module 10, in power supplyWhen module 10 is closed, trigger discharge module 50 the second feeder ear g2 of supply module 10 discharged, make supply module 10The second supply voltage VCC quickly falls to and stops voltage Vstop from normal working voltage Vclamp. Concrete, described input electricityPress detection module 40 indirectly to judge supply module by the size that detects the inductive current rate of rise in power transfer module 30The variation of the first supply voltage Vin of 10 illustrates under the first supply voltage Vin in the time that the inductive current rate of rise is less than predetermined valueDrop to a certain specific voltage, now export a discharge signal discharge module 50 is discharged to the second supply voltage VCCVstop。
Described discharge module 50, discharges for the second feeder ear g2 to supply module 10.
The first feeder ear g1 of described supply module 10 connects power transfer module 30, and second of described supply module 10 suppliesElectricity end g2 connects power transfer module 30 by described supply voltage state analyzing module 20, described supply voltage state analysis mouldThe output of piece 20 connects the first control end a of discharge module 50, described supply voltage shape by input voltage detection module 40State analysis module 20 connects the second control end b of described discharge module 50, and the input of described discharge module 50 connects described confessionThe second feeder ear g2 of electricity module 10.
Like this, by the present invention, in the time of power cutoff switch S 1, the second supply voltage VCC of supply module 10 fastDrop to and stop voltage Vstop from operating voltage Vclamp, at the second supply voltage VCC of supply module 10 higher than the first voltageVhigh and during lower than starting resistor Von, makes discharge module 50 enter the second feeder ear g2 of supply module 10 with the first electric currentRow electric discharge, thus avoid the residual voltage (the first supply voltage Vin) of the first feeder ear g1 of supply module 10 to make the second confessionPiezoelectric voltage VCC rises to starting resistor Von, false triggering dimming control signal. After quick-make power switch S1, the first power supplyVoltage Vin voltage is higher, makes the second supply voltage VCC of supply module 10 rise to starting resistor from stopping voltage VstopWhen Von, output dimming control signal, has realized light modulation. The circuit that utilizes power switch to realize light modulation provided by the invention, only needsDisconnect fast and closed electrical source switch, can realize the light modulation to light source, the light modulation mistake that there will not be prior art to exist.
See also Fig. 2, described supply voltage state analyzing module 20 specifically comprises state analysis unit 210, stateMachine U1 and output current control module 220.
Described state analysis unit 210, for detection of the second supply voltage VCC of supply module 10, at the second power supply electricityWhile pressing VCC to exceed the scheduled time higher than shutoff voltage Voff and lower than the duration of the state of starting resistor Von, to stateMachine U1 resets, and makes state machine U1 at upper first state that enters while once powering on; Disconnect at power switch S1, supply module 10 theTwo supply voltage VCC when stopping voltage Vstop, close discharge module 50, and close by output current control module 220Power transfer module 30; At the second supply voltage VCC of power switch S1 closure, supply module 10 from stopping voltage VstopBe raised to after starting resistor Von, change the state of state machine U1, make state machine U1 export corresponding status signal; At supply moduleThe second supply voltage VCC of 10 during higher than the first voltage Vhigh and lower than starting resistor Von, makes discharge module 50 with firstElectric current discharges to the second feeder ear g2 of supply module 10. The described scheduled time is set as required, can judge instituteState the circuit that utilizes power switch to realize light modulation and whether thoroughly close (power switch S1 is no longer closed). In the present embodiment, described inThe scheduled time is 4 seconds, that is, after power switch S1 disconnects 4 seconds, state analysis unit 210 resets to state machine U1, described electricityRoad is thoroughly closed. The present invention is determined by chip internal timer predetermined resetting time, makes the reset of state machine U1 can notBe subject to the impact of electrochemical capacitor residual voltage, resetting time, section precision obviously wanted high compared with the documents in background technology.
Described state machine U1, for according to the control of state analysis unit 210, exports corresponding status signal to output electricityCurrent control unit 220; In other words, described state machine U1, according to the control of state analysis unit, changes the state of self. DescribedIn state machine U1, multiple states can be set as required. In the present embodiment, in described state machine U1, be provided with the first state, secondState and the third state, wherein, described the first state is the original state after state machine U1 resets. The corresponding electricity of described the first stateSource modular converter 30 is exported 10% electric current, that is, light-source brightness is the darkest. Described the second state corresponding power modular converter 30 is exported100% electric current, that is, light-source brightness is the brightest. Described third state corresponding power modular converter 30 is exported 40% electric current, that is, and and lightSource brightness is medium. State machine U1 changes state by the sequential loop of the first state, the second state and the third state. Certainly, thisThe situation in the present embodiment, in fact, the first state, the second state, the third state and power transfer module 30 output currentsThe corresponding relation of size (light modulation brightness) can arbitrarily arrange voluntarily. Also shadow not of the gear of increase/minimizing state and light modulation brightnessRing light modulation of the present invention.
Described output current control module 220, outputs to power supply and turns for status signal being converted to dimming control signalDie change piece 30, to regulate power transfer module to export to the voltage of light source. Concrete, described output current control module 220 connectsReceive the status signal of state machine U1, change the output current of power transfer module 30, reach the object of light modulation.
Described state analysis unit 210 connects described output current control module 220 by state machine U1.
In other words, described state analysis unit 210 detects the second supply voltage VCC of supply module 10, at power supply mouldThe second supply voltage VCC of piece 10 exceedes higher than shutoff voltage Voff and lower than the lower duration of state of starting resistor VonWhen the scheduled time, state machine U1 is resetted, make state machine U1 at upper first state that enters while once powering on; Described state analysis listUnit 210 disconnects at power switch S1, the second supply voltage VCC of supply module 10 when stopping voltage Vstop, close electric dischargeModule 50, and by output current control module 220 powered-down modular converters 30; Described state analysis unit 210 is at power supplyThe second supply voltage VCC of switch S 1 closure, supply module 10 rises to starting resistor Von from stopping voltage Vstop, changesThe state of state machine U1, described state machine U1, according to the control of state analysis unit 210, exports corresponding status signal to outputCurrent control unit 220, described output current control module 220 converts status signal to dimming control signal and outputs to power supplyModular converter 30, to regulate power transfer module 30 to export to the voltage of light source; Described state analysis unit 210 is at supply moduleThe second supply voltage VCC of 10 during higher than the first voltage Vhigh and lower than starting resistor Von, makes discharge module 50 with firstElectric current discharges to the second feeder ear g2 of supply module 10.
Please continue to refer to Fig. 2, described state analysis unit 210 comprises the first comparator Q1, the first hysteresis loop comparator Q2,Two hysteresis loop comparator Q3, timer T1, first and door Q4, second with Q6 and not gate Q5; Second of described supply module 10 suppliesElectricity end g2 connects normal phase input end, the normal phase input end of the first hysteresis loop comparator Q2, the second hysteresis comparison of the first comparator Q1The input of the normal phase input end of device Q3 and discharge module 50, the inverting input of described the first comparator Q1 connects shutoff voltageVoff providing end, the first input end 1 of the output connection timer T1 of described the first comparator Q1 and first and door Q4 theOne input, the output of described timer T1 connect after oppositely first with the second input of door Q4, described first with a door Q4The reset terminal (Reset end) of output connect state machine U1, the inverting input of described the first hysteresis loop comparator Q2 is provided withUpper threshold and Lower Threshold, visiting of described the first hysteresis loop comparator Q2 is limited to starting resistor Von, Xiamen is limited to and stops voltageVstop; The second input 2 of the output connection timer T2 of described the first hysteresis loop comparator Q2, the clock of state machine U1 letterThe input of number input (CLK end) and not gate Q5, the output of described not gate Q5 connect second with the first input end of door Q6,The inverting input of described the second hysteresis loop comparator Q3 is provided with Upper threshold and Lower Threshold, and described the second hysteresis loop comparator Q3's is upperThresholding is that the first voltage Vhigh, Xiamen are limited to second voltage Vlow, and the output of described the second hysteresis loop comparator Q3 connects secondWith the second input of door Q6, described second is connected the second control end b of described discharge module 50 with the output of door Q6; DescribedShutoff voltage Voff < second voltage Vlow < stops the normal work of voltage Vstop < the first voltage Vhigh < starting resistor Von <Make voltage Vclamp. The timing of described timer T1 is exactly the described scheduled time.
Described supply module 10 also comprises AC power AC, rectification filtering unit 110 and power supply unit 120.
Described AC power AC, for providing alternating current; , described AC power AC is civil power.
Described rectification filtering unit 110, for alternating current is carried out to rectification and filtering, output the first supply voltage Vin givesPower transfer module 30 is powered.
Described power supply unit 120, for exporting the second supply voltage VCC to the described electricity that utilizes power switch to realize light modulationRoad power supply; , power to supply voltage state analyzing module 20, power transfer module 30 and input voltage detection module 40.
Described AC power AC connects the input of rectification filtering unit 110, described rectifying and wave-filtering by power switch S1The output of unit 110 is the first feeder ear g1 of supply module 10, input and the power supply modulus of conversion of connection power supply unit 120The input of piece 30, the output of described power supply unit 120 is the second feeder ear g2, connection first comparator of supply module 10The normal phase input end of the normal phase input end of Q1, the normal phase input end of the first hysteresis loop comparator Q2, the second hysteresis loop comparator Q3 and puttingThe input of electricity module 50.
Described power supply unit 120 comprises the first resistance R 1, the first capacitor C 1 and Zener diode D1; Described the first resistance R 1One end be power supply unit 120 input, connect the output of rectification filtering unit 110, another of described the first resistance R 1The output that end is power supply unit 120, one end, the negative pole of Zener diode D1, the first comparator Q1 of connection the first capacitor C 1Normal phase input end, the normal phase input end of the first hysteresis loop comparator Q2, normal phase input end and the electric discharge of the second hysteresis loop comparator Q3The input of module 50; The other end ground connection of described the first capacitor C 1, the plus earth of described Zener diode D1. In normal workWhile work, described Zener diode D1 can be by the output voltage V CC(of power supply unit 120 the second supply voltage) be stabilized in operating voltageVclamp。
Described discharge module 50 comprises the first current source I1, the second current source I2, the first switch S 2 and second switch S3, instituteThe negative pole of stating the second current source I2 is the input of discharge module 50, the negative pole that connects the first current source I1 and the first resistance R 1The other end, the positive pole of described the second current source I2 is by second switch S3 ground connection, and the control end of described second switch S3 is electric dischargeThe output of the second control end b, connection second and the door Q6 of module 50; The positive pole of described the first current source I1 is by the first switchS2 ground connection, the control end of described the first switch S 2 is the first control end a, the connection input voltage detection module 40 of discharge module 50Output. Described the first current source I1 and the second current source I2 are continuous current source, and electric current that can be constant is to the list of poweringThe output voltage V CC of unit 120 discharges.
Power transfer module 30 provided by the invention, has multiple particular circuit configurations, in the present embodiment, and described power supply conversionModule 30 belongs to non-isolation pressure-reducing structure, specifically comprises the first diode D2, the second capacitor C 2 and inductance L 1, the described the 1The negative pole of utmost point pipe D2 be power transfer module 30 input, connect output, first resistance R 1 of rectification filtering unit 110One end of one end and the second capacitor C 2, the positive pole of described the first diode D2 connects the output of output current control module 220With one end of inductance L 1, the other end of described inductance L 1 connects the other end of the second capacitor C 2, one end of described the second capacitor C 2For the output cathode of power transfer module 30, the positive pole of connection light source, the other end of described the second capacitor C 2 is power supply modulus of conversionThe output negative pole of piece 30, the negative pole of connection light source.
Described output current control module 220 comprises power switch pipe Q7, the second resistance R 2, the second comparator Q8, signalProcess subelement and power switch driven element unit.
Described signal is processed subelement, exports to power switch driving for status signal being converted to dimming control signalSubelement.
Described power switch driven element unit, for according to described dimming control signal, exports the PWM letter of different dutyNumber give the grid of power switch pipe Q7.
The input that described signal is processed subelement is input, the connect state machine U1 of output current control module 220Output, the first output that described signal is processed subelement connects power switch pipe Q7 by power switch driven element unitGrid, the second output that described signal is processed subelement connects the inverting input of the second comparator Q8, described the second ratioConnect the feedback input end of signal processing subelement compared with the output of device Q8, the source electrode of described power switch pipe Q7 connects the second ratioCompared with the input of the normal phase input end of device Q8, input voltage detection module 40, also by the second resistance R 2 ground connection, described power is openedThe drain electrode of closing pipe Q7 is one of the output of output current control module 220, the positive pole that connects the first diode D2 and inductance L 1End.
Hence one can see that, and described output current control module 220 is input to the signal of power switch pipe Q7 grid by changeDutycycle and/or the mode of inductive current make power transfer module 30 export specific output current, thereby realize to lightThe light modulation in source.
Described rectification filtering unit 110 comprises rectifier bridge and the 3rd capacitor C 3, and the output cathode of described rectifier bridge connects theOne end of three capacitor C 3, one end of the first resistance R 1, the negative pole of the first diode D2 and one end of the second capacitor C 2, described arrangementThe output negative pole ground connection of bridge, the other end ground connection of described the 3rd capacitor C 3.
See also Fig. 3, after the long-time disconnection of power switch S1, the voltage Vin(first of first resistance R 1 one end powersVoltage) all will drop to low-voltage with the output voltage V CC of power supply unit 120. When after power switch S1 closure, Vin risesFor high voltage, and can be by the first resistance R 1(starting resistance) the first capacitor C 1 is charged, VCC starts to rise, on VCCRising slope is K1=(Vin-VCC)/(R1*C1). Before VCC rises to Voff, the output Vreset of the first comparator Q1 is lowLevel, resets to all control modules, that is, timer T1 is cleared, and state machine U1 is reset original state (the first shapeState), wait for that VCC rises to Von and makes the output Vwork of the first hysteresis loop comparator Q2 occur the clock from low level to high levelSignal triggers state machine U1 and enters the second state. Fig. 4 is the transition diagram of state machine U1 in the present invention, and P1 is original state, and P2 isThe second state, P3 is the third state, corresponding power modular converter 30 is exported 10% electric current respectively, 100% electric current, 40% electricityStream, every through the once operation of the light modulation of cut-off/close power switch S1 fast, make Vwork occur that a rising edge makes stateMachine U1 jumps to NextState, exports corresponding electric current to light source; In order to make to export for the first time 100% electric current, need to beVCC resets to original state P1 state machine U1 during lower than Voff, and now Vwork signal is low level, output current control listUnit 220 quits work, until VCC changes the state of state machine U1 as the second state by Vwork signal rising edge into after rising to VonP2, output current control module 220 is started working simultaneously, makes the electric current of power transfer module 30 outputs corresponding 100%.
When rising to, VCC meets Vhigh < VCC < Von, the first hysteresis loop comparator Q2 output low level, the second hysteresis comparisonDevice Q3 output high level make second with the output Vdis of door Q6 be high level, the electricity of discharge module 50 taking size as the first electric currentStream, to VCC electric discharge, causes the VCC rate of rise to reduce, and now the VCC rate of rise becomes K2=[(Vin-VCC)/R1-I2]/C1, byVCC is greater than I2 in higher (the Vin-VCC)/R1 of Vin, therefore can continue to rise; In the time that VCC rises to Von, the first hysteresis loop comparator Q2Output Vwork become high level from low level and produce a rising edge and trigger state machine U1 and change into state P2, Vdis becomes simultaneouslyFor low level stops VCC discharging to reduce power consumption; Output current control module 220 and power transfer module 30 are started working.During VCC rises to Von from Voff, timer T1 is in timing, and still VCC rises to Von required time (this from Voff conventionallyInvention is less than 1 second) be less than the timing (being the scheduled time, is 4 seconds) of timer T1, therefore being less than timing, finishes timer T1Through being resetted by Vwork signal, therefore can not produce the signal that state machine U1 is resetted.
Signal in output current control module 220 is processed subelement, and to receive the status signal of state machine U1 output (defeatedGo out electric current demand information), according to pre-set method, by adjust suitable Vth and/or pwm signal dutycycle and/Or switching frequency outputs to power transfer module 30, make power transfer module 30 export the electric current of reserving in advance.
In this example, input voltage detection module 40 is whether to judge Vin voltage by the rate of rise of detection Vcs signalPower down, its principle is: rate of rise K3=R2* (Vin-Vout)/L1 of Vcs, its waveform is as shown in Figure 5; For a certain specific establishingMeter R2, Vout and L1 are known constant parameter, therefore rate of rise K3 is directly proportional to (Vin-Vout), can pass through to detect the number of K3Value obtains the situation of Vin indirectly. When being less than a certain setting numbers illustrated Vin, K3 there is power down (power switch S1 disconnection), inputVoltage detection module 40 is exported a discharge signal to discharge module 50 electric current of discharge module 50 taking size as I1 is entered VCCRow is electric discharge fast, and VCC voltage drops to Vstop(VCC from clamp voltage Vclamp fast and is less than Vstop and makes the first hysteresisComparator Q2 output low level stops the work of input voltage detection module 40, and I1 path stops electric discharge), as Fig. 3 power switchS1 disconnects the waveform in moment, although after this have residual voltage to charge to the first capacitor C 1 on electrochemical capacitor, nowVdis is high level, and discharge module 50 discharges to the first capacitor C 1 with the first electric current, and this discharge current is greater than aftercurrentTo the charging current of the first capacitor C 1, therefore VCC voltage continues to decline, until drop to Vlow, after this Vdis becomes low level, I2Path stops electric discharge, and VCC voltage is because residual voltage becomes rising to the charging of the first capacitor C 1, until rise to Vhigh,I2 path becomes decline to VCC electric discharge again, and when VCC drops to Vlow again, I2 discharge path is closed again, if nowWhen residual voltage is enough large, VCC constantly changes between Vhigh and Vlow, is less than when residual voltage is reduced to charging currentThe electricity consumption of other functional module, VCC voltage slow decreasing, before VCC drops to Voff, and before timer T1 timing finishesIf power switch S1 is again closed, VCC voltage will be climbed to Von, and its process is identical with initial power up, works as VCCRise to Von, the first hysteresis loop comparator Q2 exports a rising edge makes state machine U1 jump to next output state, and system output is rightThe electric current (the corresponding third state in this example, 40% when output current is the second state) of answering. Just between Vhigh and VonThe discharge path that increases by a second current source I2 just can have been avoided residual voltage that VCC is charged to Von causing false triggering stateMachine U1; Can use the first less capacitor C 1 to reach longer and close unnecessary operating current between Vlow and VoffHold time. So far completed once complete light modulation process, power switch S1 cut-off/close will repeat one fast at every turnInferior above light modulation process, output current changes once.
Fig. 3 has also shown shutdown reseting procedure, when power switch S1 disconnects and can not in scheduled time Trst againAgain closed, timer T1 will reset (resetting to original state) to state machine U1 by force, state machine U1 be reset withAfter, no matter before state machine U1 in which kind of state, when power switch S1 again closed, when system is worked again, state machine U1Must work in the first state, and export corresponding electric current. In Fig. 3, Vrst is the voltage of the reset terminal of state machine U1.
Hence one can see that, and the circuit that utilizes power switch to realize light modulation provided by the invention, compared with prior art has realityThe circuit structure of existing light modulation/toning is simple, and cost is low, and reliability is strong, the advantage of high conformity.
Power transfer module 30 provided by the invention has multiple circuit structure, refers to Fig. 6, and in embodiment 2, (upper one is realExecute example for embodiment 1), be that power transfer module 30 is connected to the structure of boosting, the source of power switch pipe Q7 from the different of enforcement 1The rate of rise of pole tension Vcs becomes K3=R2*Vin/L1, and input voltage detection module 40 can obtain by the numerical value that detects K3To the voltage condition of Vin, other modules and the light modulation principle of described circuit are identical with embodiment 1.
Refer to Fig. 7, in embodiment 3, power transfer module 30 is connected to isolation flyback structure, power switch pipeThe source voltage Vcs rate of rise of Q7 becomes K3=R2*Vin/Lp, and input voltage detection module 40 can be by detecting the number of K3Value obtains the voltage condition of Vin, and other modules and the light modulation principle of described circuit are identical with embodiment 1.
Refer to Fig. 8, in embodiment 4, be input voltage detection module and supply module from the different of embodiment 1Share. Fig. 9 is in embodiment 4, the waveform of important node. Vin drops to low-voltage, VCC electricity because power switch S1 disconnectsPress thereupon and decline, so can whether judge lower than Vstop whether power switch S1 disconnects by detecting VCC voltage; Due toVstop has dropped to Vstop therefore VCC is discharged without discharge module, and discharge module 50 is also with regard to Zhi Xu No. mono-discharge circuit. RealExecute in example 4, power transfer module 30 can adopt any one circuit structure in embodiment 1, embodiment 2 and embodiment 3. In realityExecute in example 4, other modules and light modulation principle thereof are identical with embodiment 1.
Based on above-mentioned 4 embodiment, the present invention also provides a kind of light fixture, comprises that light source and the power supply that utilizes as above openThe circuit of light modulation is realized in pass. Because structure, the light modulation principle of described light fixture have been described in detail in the above-described embodiments,This repeats no more.
Be understandable that, for those of ordinary skills, can and send out according to technical scheme of the present inventionBright design is equal to replaces or changes, and all these changes or replacement all should belong to the guarantor of the appended claim of the present inventionProtect scope.
Claims (10)
1. utilize power switch to realize a circuit for light modulation, it is characterized in that, comprising:
Be provided with the supply module of power switch, described power switch is for controlling the opening and closing of supply module;
Described supply module has the first feeder ear and the second feeder ear, and described the first feeder ear is used for exporting the first supply voltageGive power transfer module; Described the second feeder ear is used for exporting the second supply voltage to supply voltage state analyzing module;
Power transfer module, for being converted to the first supply voltage the operating voltage of light source;
Input voltage detection module, in the time that supply module is closed, triggers second feeder ear of discharge module to supply moduleDischarge, make the second supply voltage quickly fall to and stop voltage from normal working voltage;
Discharge module, discharges for the second feeder ear to supply module;
Supply voltage state analyzing module, for detection of the second supply voltage of supply module, mould disconnects, powers at power switchThe second supply voltage of piece when stopping voltage, powered-down modular converter and discharge module; In power switch closure, power supplyWhen the second supply voltage of module rises to starting resistor from stopping voltage, output dimming control signal arrives power transfer module,Export to the voltage of light source to regulate power transfer module; At the second supply voltage of supply module higher than the first voltage and lowIn the time of starting resistor, discharge module is discharged to the second feeder ear of supply module with the first electric current;
Described the first electric current is greater than after power switch disconnection, the charged electrical that the electrochemical capacitor residual voltage in supply module formsStream; The described voltage that stops is less than the first voltage, and described the first voltage is less than starting resistor;
The first feeder ear of described supply module connects power transfer module, described in the second feeder ear of described supply module passes throughSupply voltage state analyzing module connects power transfer module, and the output of described supply voltage state analyzing module is by inputVoltage detection module connects the first control end of discharge module, and described supply voltage state analyzing module connects described discharge moduleThe second control end, the input of described discharge module connects the second feeder ear of described supply module.
2. the circuit that utilizes power switch to realize light modulation according to claim 1, is characterized in that, described supply voltage shapeState analysis module comprises state analysis unit, state machine and output current control module;
The second supply voltage of described state analysis unit inspection supply module, at the second supply voltage of supply module higher than passPower-off is pressed and while exceeding the scheduled time lower than the duration of starting resistor, state machine is resetted, and makes state machine once upperWhile powering on, enter the first state; Described state analysis unit disconnects at power switch, the second supply voltage of supply module lower thanWhile stopping voltage, close discharge module, and by output current control module powered-down modular converter; Described state analysis listUnit rises to starting resistor from stopping voltage at the second supply voltage of power switch closure, supply module, changes state machineState, described state machine, according to the control of state analysis unit, is exported corresponding status signal to output current control module,Described output current control module converts status signal to dimming control signal and outputs to power transfer module, to regulate power supplyModular converter is exported to the voltage of light source; Described state analysis unit at the second supply voltage of supply module higher than the first voltageAnd during lower than starting resistor, make discharge module second feeder ear electric discharge to supply module with the first electric current.
3. the circuit that utilizes power switch to realize light modulation according to claim 2, is characterized in that, described state analysis listUnit comprise the first comparator, the first hysteresis loop comparator, the second hysteresis loop comparator, timer, first and door, second with and non-Door; It is defeated that the second feeder ear of described supply module connects the positive of normal phase input end, the first hysteresis loop comparator of the first comparatorEnter end, the normal phase input end of the second hysteresis loop comparator and the input of discharge module, the inverting input of described the first comparatorConnect shutoff voltage providing end, the first input end of the output connection timer of described the first comparator and first with theOne input, the output of described timer connect after oppositely first with the second input of door, described first with the output of doorThe reset terminal of end connect state machine, visiting of described the first hysteresis loop comparator is limited to starting resistor, Xiamen is limited to and stops voltage; InstituteState the clock signal input terminal of the second input, state machine of the output connection timer of the first hysteresis loop comparator and not gateInput, the output connection second of described not gate and the first input end of door, visiting of described the second hysteresis loop comparator is limited toThe first voltage, Xiamen are limited to second voltage, the output connection second of described the second hysteresis loop comparator and the second input of door,Described second is connected the second control end of described discharge module with the output of door; Described shutoff voltage < second voltage < stopsVoltage < the first voltage < starting resistor.
4. the circuit that utilizes power switch to realize light modulation according to claim 3, is characterized in that, described supply module alsoComprise:
AC power, for providing alternating current;
Rectification filtering unit, for carrying out rectification and filtering to alternating current;
Power supply unit, for to the described circuit supply that utilizes power switch to realize light modulation;
Described AC power connects the input of rectification filtering unit, the output of described rectification filtering unit by power switchFor the first feeder ear, the connection input of power supply unit and the input of power transfer module of supply module, described power supply listThe output of unit second feeder ear that is supply module, the normal phase input end that connects the first comparator, the first hysteresis loop comparatorThe normal phase input end of normal phase input end, the second hysteresis loop comparator and the input of discharge module.
5. the circuit that utilizes power switch to realize light modulation according to claim 4, is characterized in that, described power supply unit bagDraw together the first resistance, the first electric capacity and Zener diode; One end of described the first resistance is input, the connection rectification of power supply unitThe output of filter unit, the output that the other end of described the first resistance is power supply unit, one end of connection the first electric capacity, steadyPress negative pole, the normal phase input end of the first comparator, the normal phase input end of the first hysteresis loop comparator, the second hysteresis comparison of diodeThe normal phase input end of device and the input of discharge module; The other end ground connection of described the first electric capacity, described Zener diode justUtmost point ground connection.
6. the circuit that utilizes power switch to realize light modulation according to claim 5, is characterized in that, described discharge module bagDraw together the first current source, the second current source, the first switch and second switch, what the negative pole of described the second current source was discharge module is defeatedEnter end, connect the negative pole of the first current source and the other end of the first resistance, the positive pole of described the second current source passes through second switchGround connection, the output of the second control end, connection second and door that the control end of described second switch is discharge module; Described firstThe positive pole of current source is by the first switch ground connection, the first control end, connection that the control end of described the first switch is discharge moduleThe output of input voltage detection module.
7. the circuit that utilizes power switch to realize light modulation according to claim 6, is characterized in that, described power supply modulus of conversionPiece comprises the first diode, the second electric capacity and inductance, input, company that the negative pole of described the first diode is power transfer moduleConnect output, one end of the first resistance and one end of the second electric capacity of rectification filtering unit, the positive pole of described the first diode connectsThe one end that connects output and the inductance of output current control module, the other end of described inductance connects the other end of the second electric capacity,One end of described the second electric capacity is the output cathode of power transfer module, and the other end of described the second electric capacity is power transfer moduleOutput negative pole.
8. the circuit that utilizes power switch to realize light modulation according to claim 7, is characterized in that, described output current controlUnit processed comprises power switch pipe, the second resistance, the second comparator, also comprises:
Signal is processed subelement, exports to power switch driven element unit for status signal being converted to dimming control signal;
Power switch driven element unit, for according to described dimming control signal, exports the pwm signal of different duty to powerThe grid of switching tube;
The input that described signal is processed subelement is the input of output current control module, the output of connect state machine,Described signal is processed the first output of subelement by the grid of power switch driven element unit connection power switch pipe, described inThe second output of signal processing subelement connects the inverting input of the second comparator, and the output of described the second comparator connectsConnect signal and process the feedback input end of subelement, the source electrode of described power switch pipe connect the second comparator normal phase input end,The input of input voltage detection module, also by the second resistance eutral grounding, the drain electrode of described power switch pipe is output current controlOutput, the connection positive pole of the first diode and one end of inductance of unit processed.
9. the circuit that utilizes power switch to realize light modulation according to claim 8, is characterized in that, described rectifying and wave-filtering listUnit comprises rectifier bridge and the 3rd electric capacity, the output cathode of described rectifier bridge connect one end, first resistance of the 3rd electric capacity one end,One end of the negative pole of the first diode and the second electric capacity, the output negative pole ground connection of described arrangement bridge, another of described the 3rd electric capacityEnd ground connection.
10. a light fixture, comprises light source, it is characterized in that, described light fixture also comprises as described in claim 1-9 any oneUtilize power switch to realize the circuit of light modulation.
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| TWI611727B (en) * | 2017-03-10 | 2018-01-11 | 矽誠科技股份有限公司 | Light emitting driving apparatus and signal modulating module thereof |
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| TWI611727B (en) * | 2017-03-10 | 2018-01-11 | 矽誠科技股份有限公司 | Light emitting driving apparatus and signal modulating module thereof |
| US10123383B1 (en) | 2017-05-02 | 2018-11-06 | Semisilicon Technology Corp. | Light emitting diode driving apparatus and signal-adjusting module thereof |
| CN109195274A (en) * | 2018-11-07 | 2019-01-11 | 无锡恒芯微科技有限公司 | Avoid the DIM light adjusting circuit of OVP false triggering |
| CN111443629A (en) * | 2020-04-02 | 2020-07-24 | 南京理工大学 | Power supply and control circuit applied to cube star brake sail |
| CN111443629B (en) * | 2020-04-02 | 2021-09-10 | 南京理工大学 | Power supply and control circuit applied to cube star brake sail |
| CN114253381A (en) * | 2021-12-23 | 2022-03-29 | 厦门四信通信科技有限公司 | Electronic equipment and abnormal reset circuit thereof |
| CN114340091A (en) * | 2021-12-28 | 2022-04-12 | 广州易而达科技股份有限公司 | Lighting double-control circuit and lighting control method |
| CN114340091B (en) * | 2021-12-28 | 2023-09-08 | 广州易而达科技股份有限公司 | Lighting double-control circuit and lighting control method |
| TWI830355B (en) * | 2022-08-31 | 2024-01-21 | 通嘉科技股份有限公司 | Control methods for interleaved power converter |
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