CN205124073U - Utilize switch to realize circuit and lamps and lanterns of adjusting luminance - Google Patents
Utilize switch to realize circuit and lamps and lanterns of adjusting luminance Download PDFInfo
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- CN205124073U CN205124073U CN201520885478.7U CN201520885478U CN205124073U CN 205124073 U CN205124073 U CN 205124073U CN 201520885478 U CN201520885478 U CN 201520885478U CN 205124073 U CN205124073 U CN 205124073U
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Abstract
The utility model discloses an utilize switch to realize circuit and lamps and lanterns of adjusting luminance, including power module, power conversion module, input voltage detection module, the module of discharging and power supply voltage state analysis module. When power module closed, the pair of module power module's that discharges second feeder ear discharged, and messenger power module's the 2nd power supply voltage drops rapidly to from normal operating voltage and stops voltage, and the light source of avoiding inside charge and discharge of capacitor to result in glimmers. Power supply voltage state analysis module closed, the 2nd power supply voltage of switch when stopping the voltage build -up to starting voltage, output dimming control signal to the voltage of power conversion module with the regulation light source. When the 2nd power supply voltage was higher than first voltage and is less than starting voltage, the module of discharging was discharged with the second feeder ear of first electric current to power module. First electric current is greater than switch disconnection back, and charging current that the electrolytic capacitor survival voltage formed has avoided the survival voltage to be higher than the mistake that starting voltage arouses and has started.
Description
Technical field
The utility model relates to Switching Power Supply field of LED drive, particularly a kind of utilize mains switch to realize light modulation circuit and light fixture.
Background technology
It is long that LED has the life-span as lighting source, pollution-free, luminous efficiency high is used widely at the numerous areas such as general illumination and decorative lighting, but the light-dimming method of traditional dimmer of serial connection controllable silicon on the power line is not also suitable for common LED lighting, even if special processing makes LED lamp can compatible silicon controlled light modulation, for the existing regular tap without serial connection controllable silicon dimmer, want that realizing dimming function must rearrange connecting line, install complicated, cost is high.
Prior art " a kind of LED dimming driving circuit " (CN201310176350.9) proposes a kind of quick disconnection and ON Action of the VCCPIN change in voltage indirect monitoring mains switch by detecting LED drived control chip, then realizes sectional dimming function by the state machine of control IC and logic processing module.This technology can realize the brightness adjustment control to LED easily on the basis increasing cost hardly, but the shortcoming that existence two is serious.The first, in order to obtain longer resetting time (as 4 seconds), this utility model needs the operating current reducing IC after VCC<=Vstop, and VCC descending slope is reduced.But residual voltage Vin (remain) can be there is after electrochemical capacitor repid discharge and VCC electric capacity is charged, charging current is Istart=(Vin (remain)-Vcc)/Rst, when the operating current Iop of IC is less, when meeting Iop<Istart, also VCC voltage rise can be caused to be that switch closed action causes light modulation mistake to Von, IC erroneous judgement even if switch is again not closed; The second, resetting time (Δ t3) precision of light fixture is low.Because Δ t3 is determined the charging current Istart electric current of VCC by starting resistance Rst jointly by VCC capacitor's capacity, IC operating current Iop and input capacitance residual voltage, affect larger by peripheral condition element.When the independent LED power identical by single multiple specification of switch control rule, often occur asynchronously causing the nonsynchronous problem of light modulation owing to resetting.
Visible, prior art need to improve.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model be to provide a kind of utilize mains switch to realize light modulation circuit and light fixture, reaching the object utilizing regular tap to realize the sectional-regulated brightness of light source, having without the need to increasing extra cost, reliability is high, the feature that consistency is good.
In order to achieve the above object, the utility model takes following technical scheme:
Utilize mains switch to realize a circuit for light modulation, comprising:
Having for exporting the first supply power voltage to the first feeder ear of power transfer module with for exporting the second supply power voltage to the supply module of the second feeder ear of supply power voltage state analyzing module, in described supply module, being also provided with the mains switch of the opening and closing for controlling supply module;
For the first supply power voltage being converted to the power transfer module of the operating voltage of light source;
For when supply module is closed, second feeder ear of triggering discharges module to supply module discharges, and makes the second supply power voltage of supply module quickly fall to the input voltage measurement module stopping voltage from normal working voltage;
For the discharge module discharged to the second feeder ear of supply module;
For detecting the second supply power voltage of supply module, when the second supply power voltage of mains switch disconnection, supply module is lower than stopping voltage, powered-down modular converter and discharge module; Close at mains switch, the second supply power voltage of supply module from stopping voltage rise to starting resistor time, export dimming control signal to power transfer module, with the voltage regulating power transfer module to export to light source; When the second supply power voltage of supply module is higher than the first voltage and lower than starting resistor, make the supply power voltage state analyzing module that discharge module discharges with second feeder ear of the first electric current to supply module;
After described first electric current is greater than mains switch disconnection, the charging current that the electrochemical capacitor residual voltage in supply module is formed; Described stopping voltage being less than the first voltage, and described first voltage is less than starting resistor;
First feeder ear of described supply module connects power transfer module, second feeder ear of described supply module connects power transfer module by described supply power voltage state analyzing module, the output of described supply power voltage state analyzing module passes through the first control end of input voltage measurement model calling discharge module, described supply power voltage state analyzing module connects the second control end of described discharge module, and the input of described discharge module connects the second feeder ear of described supply module.
The described mains switch that utilizes realizes in the circuit of light modulation, and described supply power voltage state analyzing module comprises state analysis unit, state machine and output current control unit;
Described state analysis unit detects the second supply power voltage of supply module, at the second supply power voltage of supply module higher than shutoff voltage and when exceeding the scheduled time lower than the duration of starting resistor, to resets, make state machine upper once power on time enter the first state; Described state analysis unit, when the second supply power voltage of mains switch disconnection, supply module is lower than stopping voltage, closes discharge module, and by output current control unit powered-down modular converter; Described state analysis unit closes at mains switch, the second supply power voltage of supply module from stopping voltage rise to starting resistor after, change the state of state machine, described state machine is according to the control of state analysis unit, export corresponding status signal to output current control unit, described output current control unit converts status signal to dimming control signal and outputs to power transfer module, with the voltage regulating power transfer module to export to light source; Described state analysis unit, when the second supply power voltage of supply module is higher than the first voltage and lower than starting resistor, makes discharge module with the second feeder ear electric discharge of the first electric current to supply module.
The described mains switch that utilizes realizes in the circuit of light modulation, and described state analysis unit comprises the first comparator, the first hysteresis loop comparator, the second hysteresis loop comparator, timer, first and door, second and door and not gate, second feeder ear of described supply module connects the normal phase input end of the first comparator, the normal phase input end of the first hysteresis loop comparator, the normal phase input end of the second hysteresis loop comparator and the input of discharge module, the inverting input of described first comparator connects shutoff voltage providing end, the first input end of the output connection timer of described first comparator and first and the first input end of door, the output of described timer oppositely connects the second input of first and door afterwards, described first with the reset terminal of the output connect state machine of door, described visiting of first hysteresis loop comparator is limited to starting resistor, Xiamen is limited to stopping voltage, second input of the output connection timer of described first hysteresis loop comparator, the clock signal input terminal of state machine and the input of not gate, the output of described not gate connects the first input end of second and door, visiting of described second hysteresis loop comparator is limited to the first voltage, Xiamen is limited to the second voltage, the output of described second hysteresis loop comparator connect second with the second input of door, the described second the second control end being connected described discharge module with the output of door, described shutoff voltage < second voltage < stops voltage < first voltage < starting resistor.
The described mains switch that utilizes realizes in the circuit of light modulation, and described supply module also comprises:
For providing the AC power of alternating current;
For carrying out the rectification filtering unit of rectification and filtering to alternating current;
For to the described power supply unit utilizing mains switch to realize the circuit supply of light modulation;
Described AC power connects the input of rectification filtering unit by mains switch, the output of described rectification filtering unit be supply module the first feeder ear, connect the input of power supply unit and the input of power transfer module, the output of described power supply unit is the second feeder ear of supply module, the normal phase input end connecting the first comparator, the normal phase input end of the first hysteresis loop comparator, the normal phase input end of the second hysteresis loop comparator and the input of discharge module.
The described mains switch that utilizes realizes in the circuit of light modulation, and described power supply unit comprises the first resistance, the first electric capacity and voltage stabilizing didoe; One end of described first resistance be power supply unit input, connect the output of rectification filtering unit, the other end of described first resistance is the output of power supply unit, the one end connecting the first electric capacity, the negative pole of voltage stabilizing didoe, the normal phase input end of the first comparator, the normal phase input end of the first hysteresis loop comparator, the normal phase input end of the second hysteresis loop comparator and the input of discharge module; The other end ground connection of described first electric capacity, the plus earth of described voltage stabilizing didoe.
The described mains switch that utilizes realizes in the circuit of light modulation, described discharge module comprises the first current source, the second current source, the first switch and second switch, the negative pole of described second current source be discharge module input, connect the negative pole of the first current source and the other end of the first resistance, the positive pole of described second current source is by second switch ground connection, and the control end of described second switch is the second control end of discharge module, the output connecting second and door; The positive pole of described first current source is by the first switch ground connection, and the control end of described first switch is the first control end of discharge module, the output connecting input voltage measurement module.
The described mains switch that utilizes realizes in the circuit of light modulation, described power transfer module comprises the first diode, second electric capacity and inductance, the negative pole of described first diode is the input of power transfer module, connect the output of rectification filtering unit, one end of first resistance and one end of the second electric capacity, the positive pole of described first diode connects the output of output current control unit and one end of inductance, the other end of described inductance connects the other end of the second electric capacity, one end of described second electric capacity is the output cathode of power transfer module, the other end of described second electric capacity is the output negative pole of power transfer module.
The described mains switch that utilizes realizes in the circuit of light modulation, and described output current control unit comprises power switch pipe, the second resistance, the second comparator, also comprises:
The signal transacting subelement of power switch driven element unit is exported to for status signal being converted to dimming control signal;
For according to described dimming control signal, export the pwm signal of different duty to the power switch driven element unit of the grid of power switch pipe;
The input of described signal transacting subelement is the input of output current control unit, the output of connect state machine, first output of described signal transacting subelement connects the grid of power switch pipe by power switch driven element unit, second output of described signal transacting subelement connects the inverting input of the second comparator, the feedback input end of the output connection signal process subelement of described second comparator, the source electrode of described power switch pipe connects the normal phase input end of the second comparator, the input of input voltage measurement module, also by the second grounding through resistance, the drain electrode of described power switch pipe is the output of output current control unit, connect the positive pole of the first diode and one end of inductance.
The described mains switch that utilizes realizes in the circuit of light modulation, described rectification filtering unit comprises rectifier bridge and the 3rd electric capacity, the output cathode of described rectifier bridge connects one end of one end of the 3rd electric capacity, one end of the first resistance, the negative pole of the first diode and the second electric capacity, the output negative pole ground connection of described rectifier bridge, the other end ground connection of described 3rd electric capacity.
A kind of light fixture, comprises light source, also comprises the circuit utilizing mains switch to realize light modulation as above.
Compared to prior art, the utility model provide a kind of utilize mains switch to realize light modulation circuit and light fixture, described circuit comprises supply module, power transfer module, input voltage measurement module, discharge module and supply power voltage state analyzing module.The utility model is by input voltage measurement module, when supply module is closed, second feeder ear of triggering discharges module to supply module discharges, the second supply power voltage that supply module is exported quickly falls to stopping voltage from normal working voltage, avoids the light source scintillation that internal capacitance discharge and recharge causes.When the second supply power voltage that supply power voltage state analyzing module closes at mains switch, supply module exports is from stopping voltage rise to starting resistor, export dimming control signal to power transfer module, to regulate the voltage of light source, like this, by the quick disconnection of mains switch and closed, achieve light modulation.When the second supply power voltage of supply module is higher than the first voltage and lower than starting resistor, supply power voltage state analyzing module makes discharge module discharge to supply module with the first electric current; Wherein, after described first electric current is greater than mains switch disconnection, the charging current that the electrochemical capacitor residual voltage in supply module is formed, avoids the error starting that residual voltage causes higher than starting resistor.
Accompanying drawing explanation
The mains switch that utilizes that Fig. 1 provides for the utility model realizes the structured flowchart of the circuit of light modulation.
The mains switch that utilizes that Fig. 2 provides for the utility model realizes the circuit diagram of the circuit of light modulation.
The mains switch that utilizes that Fig. 3 provides for the utility model realizes in the circuit of light modulation, the voltage oscillogram of each important node.
The mains switch that utilizes that Fig. 4 provides for the utility model realizes in the circuit of light modulation, the view of state machine.
The mains switch that utilizes that Fig. 5 provides for the utility model realizes in the circuit of light modulation, the oscillogram that the pwm signal that power switch driven element unit exports is corresponding with power switch pipe source voltage Vcs.
The mains switch that utilizes that Fig. 6 provides for the utility model realizes in the circuit of light modulation, the circuit diagram of the power transfer module of embodiment 2.
The mains switch that utilizes that Fig. 7 provides for the utility model realizes in the circuit of light modulation, the circuit diagram of the power transfer module of embodiment 3.
Fig. 8 realizes the circuit of light modulation for the mains switch that utilizes shown in embodiment 4.
Fig. 9 realizes in the circuit of light modulation for the mains switch that utilizes shown in embodiment 4, the voltage oscillogram of each important node.
Embodiment
The utility model provide a kind of utilize mains switch to realize light modulation circuit and light fixture, for making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1 and Fig. 2, what the utility model provided utilizes mains switch to realize the circuit of light modulation, comprises supply module 10, supply power voltage state analyzing module 20, power transfer module 30, input voltage measurement module 40 and discharge module 50.
Described supply module 10, for power supply, concrete, for providing powered by direct current for the whole circuit utilizing mains switch to realize light modulation, mains switch S1 is provided with in described supply module 10, described mains switch S1 is for controlling the opening and closing of supply module 10, that is, whether described mains switch S1 can control the power supply of supply module 10.Described supply module 10 has the first feeder ear g1 and the second feeder ear g2, and described first feeder ear g1 is for exporting the first supply power voltage Vin to power transfer module 30; Described second feeder ear g2 is for exporting the second supply power voltage VCC to supply power voltage state analyzing module 20.Described first feeder ear g1 is electrically connected with described second feeder ear g2 by a resistance.
Described supply power voltage state analyzing module 20, for detecting the second supply power voltage VCC of supply module 10, when the second supply power voltage VCC of mains switch S1 disconnection, supply module 10 is lower than stopping voltage Vstop, powered-down modular converter 30 and discharge module 50; Close at mains switch S1, the second supply power voltage VCC of supply module 10 is when rising to starting resistor Von from stopping voltage Vstop, export dimming control signal and often rise to one-shot voltage Von to power transfer module 30(, change a dimming control signal), with the voltage regulating power transfer module 30 to export to light source; When the second supply power voltage VCC of supply module 10 is higher than the first voltage Vhigh and lower than starting resistor Von, discharge module 50 is discharged with the second feeder ear g2 of the first electric current to supply module 10.Wherein, after described first electric current is greater than mains switch S1 disconnection, the charging current that the electrochemical capacitor residual voltage in supply module 10 is formed; Certainly, described first electric current can not exceed mains switch S1 closed after, the electric current that supply module 10 normally exports.Described stopping voltage Vstop is less than the first voltage Vhigh, and described first voltage Vhigh is less than starting resistor Von.
Described power transfer module 30, for being converted to the operating voltage of light source by the first supply power voltage Vin.
Described input voltage measurement module 40, for detecting the first supply power voltage Vin of described supply module 10, when supply module 10 is closed, second feeder ear g2 of triggering discharges module 50 pairs of supply modules 10 discharges, and the second supply power voltage VCC of supply module 10 is quickly fallen to from normal working voltage Vclamp and stops voltage Vstop.Concrete, described input voltage measurement module 40 indirectly judges the change of the first supply power voltage Vin of supply module 10 by the size detecting the inductive current rate of rise in power transfer module 30, illustrate that when the inductive current rate of rise is less than predetermined value the first supply power voltage Vin drops to a certain specific voltage, now export a discharge signal and make discharge module 50 that second supply power voltage VCC is discharged to Vstop.
Described discharge module 50, for discharging to the second feeder ear g2 of supply module 10.
First feeder ear g1 of described supply module 10 connects power transfer module 30, second feeder ear g2 of described supply module 10 connects power transfer module 30 by described supply power voltage state analyzing module 20, the output of described supply power voltage state analyzing module 20 connects the first control end a of discharge module 50 by input voltage measurement module 40, described supply power voltage state analyzing module 20 connects the second control end b of described discharge module 50, and the input of described discharge module 50 connects the second feeder ear g2 of described supply module 10.
Like this, pass through the utility model, when power cutoff switch S 1, second supply power voltage VCC of supply module 10 drops to from operating voltage Vclamp fast and stops voltage Vstop, when the second supply power voltage VCC of supply module 10 is higher than the first voltage Vhigh and lower than starting resistor Von, discharge module 50 is discharged with the second feeder ear g2 of the first electric current to supply module 10, thus the residual voltage (the first supply power voltage Vin) avoiding the first feeder ear g1 of supply module 10 makes the second supply power voltage VCC rise to starting resistor Von, false triggering dimming control signal.After quick-make mains switch S1, the first supply power voltage Vin voltage is higher, when making the second supply power voltage VCC of supply module 10 rise to starting resistor Von from stopping voltage Vstop, exports dimming control signal, achieves light modulation.What the utility model provided utilizes mains switch to realize the circuit of light modulation, only needs to disconnect 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 power voltage state analyzing module 20 specifically comprises state analysis unit 210, state machine U1 and output current control unit 220.
Described state analysis unit 210, for detecting the second supply power voltage VCC of supply module 10, at the second supply power voltage VCC higher than shutoff voltage Voff and when exceeding the scheduled time lower than the duration of the state of starting resistor Von, state machine U1 is resetted, make state machine U1 upper once power on time enter the first state; When the second supply power voltage VCC of mains switch S1 disconnection, supply module 10 is lower than stopping voltage Vstop, close discharge module 50, and by output current control unit 220 powered-down modular converter 30; Close at mains switch S1, after the second supply power voltage VCC of supply module 10 rises to starting resistor Von from stopping voltage Vstop, change the state of state machine U1, make state machine U1 export corresponding status signal; When the second supply power voltage VCC of supply module 10 is higher than the first voltage Vhigh and lower than starting resistor Von, discharge module 50 is discharged with the second feeder ear g2 of the first electric current to supply module 10.The described scheduled time sets as required, can judge whether the described circuit utilizing mains switch to realize light modulation thoroughly closes (mains switch S1 is no longer closed).In the present embodiment, the described scheduled time is 4 seconds, that is, after mains switch S1 disconnects 4 seconds, state analysis unit 210 couples of state machine U1 reset, and described circuit is thoroughly closed.The utility model is determined by chip internal timer predetermined resetting time, makes the impact that can not be subject to electrochemical capacitor residual voltage on the reset of state machine U1, and resetting time, section precision obviously wanted high compared with the documents in background technology.
Described state machine U1, for the control according to state analysis unit 210, exports corresponding status signal to output current control unit 220; In other words, described state machine U1, according to the control of state analysis unit, changes the state of self.In described state machine U1, can multiple state be set as required.In the present embodiment, be provided with the first state, the second state and the third state in described state machine U1, wherein, described first state is the initial condition after state machine U1 resets.Described first state corresponding power modular converter 30 exports the electric current of 10%, that is, light-source brightness is the darkest.Described second state corresponding power modular converter 30 exports the electric current of 100%, that is, light-source brightness is the brightest.Described third state corresponding power modular converter 30 exports the electric current of 40%, that is, light-source brightness is medium.State machine U1 changes state by the sequential loop of the first state, the second state and the third state.Certainly, this is the situation in the present embodiment, and in fact, the corresponding relation of the first state, the second state, the third state and power transfer module 30 output current size (light modulation brightness) can arbitrarily be arranged voluntarily.The gear of increase/minimizing state and light modulation brightness does not affect light modulation of the present utility model yet.
Described output current control unit 220, outputs to power transfer module 30 for status signal being converted to dimming control signal, with the voltage regulating power transfer module to export to light source.Concrete, described output current control unit 220 receives the status signal of state machine U1, changes the output current of power transfer module 30, reaches the object of light modulation.
Described state analysis unit 210 connects described output current control unit 220 by state machine U1.
In other words, described state analysis unit 210 detects the second supply power voltage VCC of supply module 10, supply module 10 the second supply power voltage VCC higher than shutoff voltage Voff and lower than the state of starting resistor Von under the duration exceed the scheduled time time, state machine U1 is resetted, make state machine U1 upper once power on time enter the first state; Described state analysis unit 210, when the second supply power voltage VCC of mains switch S1 disconnection, supply module 10 is lower than stopping voltage Vstop, closes discharge module 50, and by output current control unit 220 powered-down modular converter 30; After described state analysis unit 210 closes at mains switch S1, the second supply power voltage VCC of supply module 10 rises to starting resistor Von from stopping voltage Vstop, change the state of state machine U1, described state machine U1 is according to the control of state analysis unit 210, export corresponding status signal to output current control unit 220, status signal is converted to dimming control signal and outputs to power transfer module 30 by described output current control unit 220, with the voltage regulating power transfer module 30 to export to light source; Described state analysis unit 210, when the second supply power voltage VCC of supply module 10 is higher than the first voltage Vhigh and lower than starting resistor Von, makes discharge module 50 discharge with the second feeder ear g2 of the first electric current to 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, the second hysteresis loop comparator Q3, timer T1, first and door Q4, second and door Q6 and not gate Q5, second feeder ear g2 of described supply module 10 connects the normal phase input end of the first comparator Q1, the normal phase input end of the first hysteresis loop comparator Q2, the normal phase input end of the second hysteresis loop comparator Q3 and the input of discharge module 50, the inverting input of described first comparator Q1 connects shutoff voltage Voff providing end, the first input end 1 of the output connection timer T1 of described first comparator Q1 and first and the first input end of door Q4, the output of described timer T1 oppositely connects second input of first and door Q4 afterwards, described first with the reset terminal (Reset holds) of the output connect state machine U1 of door Q4, the inverting input of described first hysteresis loop comparator Q2 is provided with Upper threshold and Lower Threshold, described visiting of first hysteresis loop comparator Q2 is limited to starting resistor Von, Xiamen is limited to and stops voltage Vstop, second input 2 of the output connection timer T2 of described first hysteresis loop comparator Q2, the clock signal input terminal (CLK end) of state machine U1 and the input of not gate Q5, the output of described not gate Q5 connects the first input end of second and door Q6, the inverting input of described second hysteresis loop comparator Q3 is provided with Upper threshold and Lower Threshold, visiting of described second hysteresis loop comparator Q3 is limited to the first voltage Vhigh, Xiamen is limited to the second voltage Vlow, the output of described second hysteresis loop comparator Q3 connects second input of second and door Q6, described second the second control end b being connected described discharge module 50 with the output of door Q6, described shutoff voltage Voff < second voltage Vlow < stops voltage Vstop < first voltage Vhigh < starting resistor Von < normal working 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; That is, described AC power AC is civil power.
Described rectification filtering unit 110, for carrying out rectification and filtering to alternating current, exporting the first supply power voltage Vin and powering to power transfer module 30.
Described power supply unit 120, for exporting the second supply power voltage VCC to the described circuit supply utilizing mains switch to realize light modulation; That is, power to supply power voltage state analyzing module 20, power transfer module 30 and input voltage measurement module 40.
Described AC power AC connects the input of rectification filtering unit 110 by mains switch S1, the output of described rectification filtering unit 110 be supply module 10 the first feeder ear g1, connect the input of power supply unit 120 and the input of power transfer module 30, the output of described power supply unit 120 is the second feeder ear g2 of supply module 10, the normal phase input end connecting the first comparator Q1, the normal phase input end of the first hysteresis loop comparator Q2, the normal phase input end of the second hysteresis loop comparator Q3 and the input of discharge module 50.
Described power supply unit 120 comprises the first resistance R1, the first electric capacity C1 and voltage stabilizing didoe D1; One end of described first resistance R1 be power supply unit 120 input, connect the output of rectification filtering unit 110, the other end of described first resistance R1 is the output of power supply unit 120, the one end connecting the first electric capacity C1, the negative pole of voltage stabilizing didoe D1, the normal phase input end of the first comparator Q1, the normal phase input end of the first hysteresis loop comparator Q2, the normal phase input end of the second hysteresis loop comparator Q3 and the input of discharge module 50; The other end ground connection of described first electric capacity C1, the plus earth of described voltage stabilizing didoe D1.When normally working, described voltage stabilizing didoe D1 can by output voltage VCC(second supply power voltage of power supply unit 120) be stabilized in operating voltage Vclamp.
Described discharge module 50 comprises the first current source I1, the second current source I2, the first switch S 2 and second switch S3, the negative pole of described second current source I2 be discharge module 50 input, connect the negative pole of the first current source I1 and the other end of the first resistance R1, the positive pole of described second current source I2 is by second switch S3 ground connection, and the control end of described second switch S3 is the second control end b of discharge module 50, the output connecting second and door Q6; The positive pole of described first current source I1 is by the first switch S 2 ground connection, and the control end of described first switch S 2 is the first control end a of discharge module 50, the output connecting input voltage measurement module 40.Described first current source I1 and the second current source I2 is continuous current source, and the output voltage VCC of electric current to power supply unit 120 that can be constant discharges.
The power transfer module 30 that the utility model provides, there is multiple particular circuit configurations, in the present embodiment, described power transfer module 30 belongs to non-isolated pressure-reducing structure, specifically comprise the first diode D2, second electric capacity C2 and inductance L 1, the negative pole of described first diode D2 is the input of power transfer module 30, connect the output of rectification filtering unit 110, one end of first resistance R1 and one end of the second electric capacity C2, the positive pole of described first diode D2 connects the output of output current control unit 220 and one end of inductance L 1, the other end of described inductance L 1 connects the other end of the second electric capacity C2, one end of described second electric capacity C2 is the output cathode of power transfer module 30, connect the positive pole of light source, the other end of described second electric capacity C2 is the output negative pole of power transfer module 30, connect the negative pole of light source.
Described output current control unit 220 comprises power switch pipe Q7, the second resistance R2, the second comparator Q8, signal transacting subelement and power switch driven element unit.
Described signal transacting subelement, exports to power switch driven element unit for status signal being converted to dimming control signal.
Described power switch driven element unit, for according to described dimming control signal, exports the pwm signal of different duty to the grid of power switch pipe Q7.
The input of described signal transacting subelement is the input of output current control unit 220, the output of connect state machine U1, first output of described signal transacting subelement connects the grid of power switch pipe Q7 by power switch driven element unit, second output of described signal transacting subelement connects the inverting input of the second comparator Q8, the feedback input end of the output connection signal process subelement of described second comparator Q8, the source electrode of described power switch pipe Q7 connects the normal phase input end of the second comparator Q8, the input of input voltage measurement module 40, also by the second resistance R2 ground connection, the drain electrode of described power switch pipe Q7 is the output of output current control unit 220, connect the positive pole of the first diode D2 and one end of inductance L 1.
It can thus be appreciated that described output current control unit 220 by changing the duty ratio of signal that is input to power switch pipe Q7 grid and/or the mode of inductive current makes power transfer module 30 export specific output current, thus realizes the light modulation to light source.
Described rectification filtering unit 110 comprises rectifier bridge and the 3rd electric capacity C3, the output cathode of described rectifier bridge connects one end of one end of the 3rd electric capacity C3, one end of the first resistance R1, the negative pole of the first diode D2 and the second electric capacity C2, the output negative pole ground connection of described rectifier bridge, the other end ground connection of described 3rd electric capacity C3.
See also Fig. 3, after mains switch S1 disconnects for a long time, voltage Vin(first supply power voltage of first resistance R1 one end) all will drop to low-voltage with the output voltage VCC of power supply unit 120.After mains switch S1 is closed, Vin rises to high voltage, and can by the first resistance R1(starting resistance) the first electric capacity C1 is charged, VCC starts rising, and the VCC rate of rise is K1=(Vin-VCC)/(R1*C1).Before VCC rises to Voff, the output Vreset of the first comparator Q1 is low level, all control modules are resetted, namely, timer T1 is cleared, state machine U1 is reset initial condition (the first state), waits for that VCC rises to Von and makes the clock signal trigger state machine U1 of the output Vwork of the first hysteresis loop comparator Q2 appearance from low level to high level enter the second state.Fig. 4 is the transition diagram of state machine U1 in the utility model, P1 is initial condition, P2 is the second state, P3 is the third state, and corresponding power modular converter 30 exports the electric current of 10% respectively, the electric current of 100%, the electric current of 40%, often through the Dimming operation of once cut-off/close mains switch S1 fast, Vwork is occurred, and a rising edge makes state machine U1 jump to NextState, exports corresponding electric current to light source; In order to the electric current making first time export 100%, need lower than during Voff, state machine U1 to be reset to initial condition P1 at VCC, now Vwork signal is low level, output current control unit 220 quits work, until VCC changes the state of state machine U1 as the second state P2 by Vwork signal rising edge into after rising to Von, output current control unit 220 is started working simultaneously, makes power transfer module 30 export the electric current of corresponding 100%.
Vhigh<VCC<Von is met when VCC rises to, first hysteresis loop comparator Q2 output low level, second hysteresis loop comparator Q3 exports high level and makes second to be high level with the output Vdis of door Q6, the electric current that discharge module 50 is the first electric current with size discharges to VCC, the VCC rate of rise is caused to reduce, now the VCC rate of rise becomes K2=[(Vin-VCC)/R1-I2]/C1, because higher (the Vin-VCC)/R1 of Vin is greater than I2, therefore VCC can continue to rise; When VCC rises to Von, the output Vwork of the first hysteresis loop comparator Q2 becomes high level from low level and produces a rising edge trigger state machine U1 and change into state P2, and Vdis becomes low level and stops VCC electric discharge to reduce power consumption simultaneously; Output current control unit 220 and power transfer module 30 are started working.During VCC rises to Von from Voff, timer T1 is in timing, but usually VCC rises to from Voff timing (the i.e. scheduled time that Von required time (the utility model is less than 1 second) is less than timer T1, it is 4 seconds), therefore timer T1 is less than timing terminates to be resetted by Vwork signal, therefore the signal that state machine U1 is resetted can not be produced.
Signal transacting subelement in output current control unit 220 receives the status signal (output current demand information) that state machine U1 exports, according to pre-set method, output to power transfer module 30 by the duty ratio and/or switching frequency that adjust suitable Vth and/or pwm signal, make power transfer module 30 export the electric current reserved in advance.
In this example, input voltage measurement module 40 is that the rate of rise by detecting Vcs signal judges the whether power down of Vin voltage, and its principle is: rate of rise K3=R2* (the Vin-Vout)/L1 of Vcs, and its waveform as shown in Figure 5; Be known constant parameter for a certain particular design R2, Vout and L1, therefore rate of rise K3 is directly proportional to (Vin-Vout), the numerical value by detecting K3 obtains the situation of Vin indirectly.Power down (mains switch S1 disconnects) is there is when K3 is less than a certain setting numbers illustrated Vin, input voltage measurement module 40 exports a discharge signal to discharge module 50 and makes discharge module 50 be that the electric current of I1 discharges fast to VCC with size, VCC voltage drops to Vstop(VCC from clamp voltage Vclamp fast and is less than the work that Vstop makes the first hysteresis loop comparator Q2 output low level stopping input voltage measurement module 40, I1 path stops electric discharge), as Fig. 3 mains switch S1 disconnects the waveform in moment, although after this electrochemical capacitor there is residual voltage to charge to the first electric capacity C1, but now Vdis is high level, discharge module 50 discharges to the first electric capacity C1 with the first electric current, this discharging current is greater than the charging current of aftercurrent to the first electric capacity C1, therefore VCC voltage continues to decline, until drop to Vlow, after this Vdis becomes low level, I2 path stops electric discharge, VCC voltage becomes rising to the charging of the first electric capacity C1 due to residual voltage, until rise to Vhigh, I2 path becomes decline to VCC electric discharge again, when VCC drops to Vlow again, I2 discharge path is closed again, if when now residual voltage is enough large, VCC constantly changes between Vhigh and Vlow, when residual voltage is reduced to the electricity consumption that charging current is less than other functional module, VCC voltage slowly declines, before VCC drops to Voff, if and timer T1 timing terminate before mains switch S1 again close, VCC voltage will be climbed to Von, its process is identical with initial power up, when VCC rises to Von, first hysteresis loop comparator Q2 exports a rising edge makes state machine U1 jump to next output state, system exports corresponding electric current (the corresponding third state in this example, when output current is the second state 40%).Between Vhigh and Von, increase the discharge path of a second current source I2 just just can avoid residual voltage and VCC is charged to Von cause false triggering state machine U1; And between Vlow and Voff, close unnecessary operating current the first less electric capacity C1 can be used to reach longer holding time.So far complete once complete dimming process, mains switch S1 cut-off/close will repeat once above dimming process fast at every turn, and output current changes once.
Fig. 3 also show shutdown reseting procedure, again disconnect as mains switch S1 and can not again close in scheduled time Trst, timer T1 will reset (resetting to initial condition) to state machine U1 by force, after state machine U1 is reset, no matter before which kind of state state machine U1 is in, when mains switch S1 closes, when system works again again, state machine U1 must work in the first state, and exports corresponding electric current.In Fig. 3, Vrst is the voltage of the reset terminal of state machine U1.
It can thus be appreciated that what the utility model provided utilizes mains switch to realize the circuit of light modulation, compared with prior art have the circuit structure realizing light modulation/toning simple, cost is low, and reliability is strong, the advantage that consistency is good.
The power transfer module 30 that the utility model provides has multiple circuit structure, refer to Fig. 6, in example 2 (a upper embodiment is embodiment 1), be that power transfer module 30 connects for boost configuration from the different of enforcement 1, the rate of rise of the source voltage Vcs of power switch pipe Q7 becomes K3=R2*Vin/L1, input voltage measurement module 40 can obtain the voltage condition of Vin by the numerical value detecting K3, 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 connects for isolation flyback structure, the source voltage Vcs rate of rise of power switch pipe Q7 becomes K3=R2*Vin/Lp, input voltage measurement module 40 can obtain the voltage condition of Vin by the numerical value detecting K3, other modules and the light modulation principle of described circuit are identical with embodiment 1.
Refer to Fig. 8, in example 4, be from the different of embodiment 1, input voltage measurement module and supply module share.Fig. 9 is in embodiment 4, the waveform of important node.Vin drops to low-voltage because mains switch S1 disconnects, and VCC voltage declines thereupon, so whether can judge whether mains switch S1 disconnects lower than Vstop by detecting VCC voltage; Dropped to Vstop due to Vstop therefore discharged to VCC without the need to discharge module, discharge module 50 is also with regard to Zhi Xu No. mono-discharge circuit.In embodiment 4, power transfer module 30 can adopt any one circuit structure in embodiment 1, embodiment 2 and embodiment 3.In example 4, other modules and light modulation principle identical with embodiment 1.
Based on above-mentioned 4 embodiments, the utility model also provides a kind of light fixture, comprises light source and utilizes mains switch to realize the circuit of light modulation as above.Because the structure of described light fixture, light modulation principle have been described in detail in the above-described embodiments, do not repeat them here.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (10)
1. utilize mains switch to realize a circuit for light modulation, it is characterized in that, comprising:
Having for exporting the first supply power voltage to the first feeder ear of power transfer module with for exporting the second supply power voltage to the supply module of the second feeder ear of supply power voltage state analyzing module, in described supply module, being also provided with the mains switch of the opening and closing for controlling supply module;
For the first supply power voltage being converted to the power transfer module of the operating voltage of light source;
For when supply module is closed, second feeder ear of triggering discharges module to supply module discharges, and makes the second supply power voltage of supply module quickly fall to the input voltage measurement module stopping voltage from normal working voltage;
For the discharge module discharged to the second feeder ear of supply module;
For detecting the second supply power voltage of supply module, when the second supply power voltage of mains switch disconnection, supply module is lower than stopping voltage, powered-down modular converter and discharge module; Close at mains switch, the second supply power voltage of supply module from stopping voltage rise to starting resistor time, export dimming control signal to power transfer module, with the voltage regulating power transfer module to export to light source; When the second supply power voltage of supply module is higher than the first voltage and lower than starting resistor, make the supply power voltage state analyzing module that discharge module discharges with second feeder ear of the first electric current to supply module;
After described first electric current is greater than mains switch disconnection, the charging current that the electrochemical capacitor residual voltage in supply module is formed; Described stopping voltage being less than the first voltage, and described first voltage is less than starting resistor;
First feeder ear of described supply module connects power transfer module, second feeder ear of described supply module connects power transfer module by described supply power voltage state analyzing module, the output of described supply power voltage state analyzing module passes through the first control end of input voltage measurement model calling discharge module, described supply power voltage state analyzing module connects the second control end of described discharge module, and the input of described discharge module connects the second feeder ear of described supply module.
2. the circuit utilizing mains switch to realize light modulation according to claim 1, is characterized in that, described supply power voltage state analyzing module comprises state analysis unit, state machine and output current control unit;
Described state analysis unit detects the second supply power voltage of supply module, at the second supply power voltage of supply module higher than shutoff voltage and when exceeding the scheduled time lower than the duration of starting resistor, to resets, make state machine upper once power on time enter the first state; Described state analysis unit, when the second supply power voltage of mains switch disconnection, supply module is lower than stopping voltage, closes discharge module, and by output current control unit powered-down modular converter; Described state analysis unit closes at mains switch, the second supply power voltage of supply module from stopping voltage rise to starting resistor after, change the state of state machine, described state machine is according to the control of state analysis unit, export corresponding status signal to output current control unit, described output current control unit converts status signal to dimming control signal and outputs to power transfer module, with the voltage regulating power transfer module to export to light source; Described state analysis unit, when the second supply power voltage of supply module is higher than the first voltage and lower than starting resistor, makes discharge module discharge with second feeder ear of the first electric current to supply module.
3. the circuit utilizing mains switch to realize light modulation according to claim 2, is characterized in that, described state analysis unit comprises the first comparator, the first hysteresis loop comparator, the second hysteresis loop comparator, timer, first and door, second and door and not gate, second feeder ear of described supply module connects the normal phase input end of the first comparator, the normal phase input end of the first hysteresis loop comparator, the normal phase input end of the second hysteresis loop comparator and the input of discharge module, the inverting input of described first comparator connects shutoff voltage providing end, the first input end of the output connection timer of described first comparator and first and the first input end of door, the output of described timer oppositely connects the second input of first and door afterwards, described first with the reset terminal of the output connect state machine of door, described visiting of first hysteresis loop comparator is limited to starting resistor, Xiamen is limited to stopping voltage, second input of the output connection timer of described first hysteresis loop comparator, the clock signal input terminal of state machine and the input of not gate, the output of described not gate connects the first input end of second and door, visiting of described second hysteresis loop comparator is limited to the first voltage, Xiamen is limited to the second voltage, the output of described second hysteresis loop comparator connect second with the second input of door, the described second the second control end being connected described discharge module with the output of door, described shutoff voltage < second voltage < stops voltage < first voltage < starting resistor.
4. the circuit utilizing mains switch to realize light modulation according to claim 3, it is characterized in that, described supply module also comprises:
For providing the AC power of alternating current;
For carrying out the rectification filtering unit of rectification and filtering to alternating current;
For to the described power supply unit utilizing mains switch to realize the circuit supply of light modulation;
Described AC power connects the input of rectification filtering unit by mains switch, the output of described rectification filtering unit be supply module the first feeder ear, connect the input of power supply unit and the input of power transfer module, the output of described power supply unit is the second feeder ear of supply module, the normal phase input end connecting the first comparator, the normal phase input end of the first hysteresis loop comparator, the normal phase input end of the second hysteresis loop comparator and the input of discharge module.
5. the circuit utilizing mains switch to realize light modulation according to claim 4, is characterized in that, described power supply unit comprises the first resistance, the first electric capacity and voltage stabilizing didoe; One end of described first resistance be power supply unit input, connect the output of rectification filtering unit, the other end of described first resistance is the output of power supply unit, the one end connecting the first electric capacity, the negative pole of voltage stabilizing didoe, the normal phase input end of the first comparator, the normal phase input end of the first hysteresis loop comparator, the normal phase input end of the second hysteresis loop comparator and the input of discharge module; The other end ground connection of described first electric capacity, the plus earth of described voltage stabilizing didoe.
6. the circuit utilizing mains switch to realize light modulation according to claim 5, it is characterized in that, described discharge module comprises the first current source, the second current source, the first switch and second switch, the negative pole of described second current source be discharge module input, connect the negative pole of the first current source and the other end of the first resistance, the positive pole of described second current source is by second switch ground connection, and the control end of described second switch is the second control end of discharge module, the output connecting second and door; The positive pole of described first current source is by the first switch ground connection, and the control end of described first switch is the first control end of discharge module, the output connecting input voltage measurement module.
7. the circuit utilizing mains switch to realize light modulation according to claim 6, it is characterized in that, described power transfer module comprises the first diode, second electric capacity and inductance, the negative pole of described first diode is the input of power transfer module, connect the output of rectification filtering unit, one end of first resistance and one end of the second electric capacity, the positive pole of described first diode connects the output of output current control unit and one end of inductance, the other end of described inductance connects the other end of the second electric capacity, one end of described second electric capacity is the output cathode of power transfer module, the other end of described second electric capacity is the output negative pole of power transfer module.
8. the circuit utilizing mains switch to realize light modulation according to claim 7, is characterized in that, described output current control unit comprises power switch pipe, the second resistance, the second comparator, also comprises:
The signal transacting subelement of power switch driven element unit is exported to for status signal being converted to dimming control signal;
For according to described dimming control signal, export the pwm signal of different duty to the power switch driven element unit of the grid of power switch pipe;
The input of described signal transacting subelement is the input of output current control unit, the output of connect state machine, first output of described signal transacting subelement connects the grid of power switch pipe by power switch driven element unit, second output of described signal transacting subelement connects the inverting input of the second comparator, the feedback input end of the output connection signal process subelement of described second comparator, the source electrode of described power switch pipe connects the normal phase input end of the second comparator, the input of input voltage measurement module, also by the second grounding through resistance, the drain electrode of described power switch pipe is the output of output current control unit, connect the positive pole of the first diode and one end of inductance.
9. the circuit utilizing mains switch to realize light modulation according to claim 8, it is characterized in that, described rectification filtering unit comprises rectifier bridge and the 3rd electric capacity, the output cathode of described rectifier bridge connects one end of one end of the 3rd electric capacity, one end of the first resistance, the negative pole of the first diode and the second electric capacity, the output negative pole ground connection of described rectifier bridge, the other end ground connection of described 3rd electric capacity.
10. a light fixture, comprises light source, it is characterized in that, the mains switch that utilizes that described light fixture also comprises as described in claim 1-9 any one realizes the circuit of light modulation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520885478.7U CN205124073U (en) | 2015-11-09 | 2015-11-09 | Utilize switch to realize circuit and lamps and lanterns of adjusting luminance |
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|---|---|---|---|
| CN201520885478.7U CN205124073U (en) | 2015-11-09 | 2015-11-09 | Utilize switch to realize circuit and lamps and lanterns of adjusting luminance |
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| CN205124073U true CN205124073U (en) | 2016-03-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107172763A (en) * | 2017-07-10 | 2017-09-15 | 上海晶丰明源半导体股份有限公司 | Switch toning control circuit, chip, method and switch toning LED drive system |
| CN111670527A (en) * | 2019-01-09 | 2020-09-15 | 深圳市大疆创新科技有限公司 | Discharging circuit for distance measuring device, distributed radar system and movable platform |
-
2015
- 2015-11-09 CN CN201520885478.7U patent/CN205124073U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107172763A (en) * | 2017-07-10 | 2017-09-15 | 上海晶丰明源半导体股份有限公司 | Switch toning control circuit, chip, method and switch toning LED drive system |
| CN107172763B (en) * | 2017-07-10 | 2019-03-08 | 上海晶丰明源半导体股份有限公司 | Switch toning control circuit, chip, method and switch toning LED drive system |
| CN111670527A (en) * | 2019-01-09 | 2020-09-15 | 深圳市大疆创新科技有限公司 | Discharging circuit for distance measuring device, distributed radar system and movable platform |
| CN111670527B (en) * | 2019-01-09 | 2024-06-11 | 深圳市大疆创新科技有限公司 | Discharge circuit for distance measuring device, distributed radar system and movable platform |
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