CN105611684B - A kind of circuit and light fixture that light modulation is realized using power switch - Google Patents
A kind of circuit and light fixture that light modulation is realized using power switch Download PDFInfo
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Abstract
The invention discloses a kind of circuit and light fixture that light modulation is realized using power switch, including power supply module, power transfer module, input voltage measurement module, discharge module and supply voltage state analyzing module.When power supply module is closed, discharge module discharges the second feeder ear of power supply module, the second supply voltage that power supply module exports is quickly fallen to stopping voltage from normal working voltage, avoids light source scintillation caused by internal capacitance discharge and recharge.Supply voltage state analyzing module exports dimming control signal to power transfer module to adjust the voltage of light source when power switch closes, the second supply voltage rises to startup voltage from stopping voltage.When the second supply voltage is higher than first voltage and is less than startup voltage, discharge module is discharged the second feeder ear of power supply module with the first electric current.After first electric current is more than power switch disconnection, the charging current of electrochemical capacitor residual voltage formation, residual voltage is avoided higher than error starting caused by startup voltage.
Description
Technical field
The present invention relates to Switching Power Supply field of LED drive, more particularly to a kind of circuit that light modulation is realized using power switch
And light fixture.
Background technology
The features such as LED has long lifespan as lighting source, pollution-free, and luminous efficiency is high is in general illumination and decorative lighting
It is used widely Deng numerous areas, but the light-dimming method of traditional light modulator of serial connection controllable silicon on the power line is not appropriate for
For common LED illuminator, even if specially treated enables LED lamp is compatible silicon controlled to dim, for existing no string
Join the regular tap of controllable silicon dimmer, want to realize that dimming function must rearrange connecting line, installation is complicated, and cost is high.
Prior art《A kind of LED dimming driving circuits》（CN201310176350.9）It is proposed a kind of by detecting LED drives
The quick off and on action of the VCC PIN voltage change indirect monitoring power switches of dynamic control chip, then by controlling IC
State machine and logic processing module realize sectional dimming function.The technology can be convenient on the basis of cost is hardly increased
The shortcomings that brightness adjustment control to LED is realized on ground, but presence two is serious.First, in order to obtain longer resetting time（Such as 4
Second）, invention needs are in VCC<Reduce IC operating current after=Vstop so that VCC descending slopes reduce.But electrochemical capacitor
There can be residual voltage Vin (remain) after repid discharge and VCC electric capacity is charged, charging current is Istart=(Vin
(remain)-Vcc)/Rst, when IC operating current Iop is smaller, meet Iop<During Istart, even if switch does not re-close
Also result in VCC voltages and rise to Von, IC erroneous judgements cause to dim mistake for switch closed action；Second, the reset of light fixture
Time（Δt3）Precision is low.Because Δ t3 is by VCC capacitor's capacities, IC operating currents Iop and input capacitance residual voltage by opening
Dynamic resistance Rst together decides on to VCC charging current Istart electric currents, is had a great influence by peripheral condition element.With single
When switch controls multiple specification identical independence LED powers, often occur and cause light modulation nonsynchronous because reset is asynchronous
Problem.
It can be seen that prior art could be improved and improve.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, realized and adjusted using power switch it is an object of the invention to provide one kind
The circuit and light fixture of light, reach the purpose to the sectional-regulated brightness of light source using regular tap realization, have extra without increase
The characteristics of cost, reliability is high, and uniformity is good.
In order to achieve the above object, this invention takes following technical scheme：
A kind of circuit that light modulation is realized using power switch, including：
The power supply module of power switch is provided with, the power switch is used for the opening and closing for controlling power supply module；
The power supply module has the first feeder ear and the second feeder ear, and first feeder ear is used to export the first power supply
Voltage is to power transfer module；Second feeder ear is used for output second and supplies voltage to supply voltage state analyzing module；
Power transfer module, for the first supply voltage to be converted to the operating voltage of light source；
Input voltage measurement module, for when power supply module is closed, triggering discharge module to be supplied the second of power supply module
Electric end is discharged, and the second supply voltage of power supply module is quickly fallen to stopping voltage from normal working voltage；
Discharge module, for discharging the second feeder ear of power supply module；
Supply voltage state analyzing module, for detecting the second supply voltage of power supply module, in power switch disconnection, supply
When second supply voltage of electric module is less than voltage is stopped, power transfer module and discharge module are closed；Power switch close,
Second supply voltage of power supply module from stop voltage rising to start voltage when, output dimming control signal is to Power convert mould
Block, the voltage to light source is exported with regulation power supply modular converter；Power supply module the second supply voltage higher than first voltage and
When again less than voltage is started, discharge module is set to be discharged with the first electric current the second feeder ear of power supply module；
After first electric current is more than power switch disconnection, the charging of the electrochemical capacitor residual voltage formation in power supply module
Electric current；The stopping voltage being less than first voltage, and the first voltage, which is less than, starts voltage；
The first feeder ear connection power transfer module of the power supply module, the second feeder ear of the power supply module pass through
The supply voltage state analyzing module connects power transfer module, and the output end of the supply voltage state analyzing module passes through
Input voltage measurement module connects the first control terminal of discharge module, and the supply voltage state analyzing module connects the electric discharge
Second control terminal of module, the input of the discharge module connect the second feeder ear of the power supply module.
In the described circuit that light modulation is realized using power switch, the supply voltage state analyzing module includes state point
Analyse unit, state machine and output current control unit；
Second supply voltage of the state analysis unit detection power supply module is high in the second supply voltage of power supply module
When turning off voltage and exceeding the scheduled time less than the duration for starting voltage, to resets, make state machine under
Enter first state when once upper electric；The state analysis unit is in power switch disconnection, the second supply voltage of power supply module
During less than stopping voltage, discharge module is closed, and power transfer module is closed by output current control unit；The state point
Analysis unit power switch closure, power supply module the second supply voltage from stop voltage rising to start voltage after, change shape
The state of state machine, the state machine according to the control of state analysis unit, export corresponding to status signal give output current control
Status signal is converted into dimming control signal and is output to power transfer module by unit, the output current control unit, to adjust
Section power transfer module exports the voltage to light source；The state analysis unit power supply module the second supply voltage higher than the
One voltage and during less than starting voltage, makes discharge module be discharged with the first electric current the second feeder ear of power supply module.
In the described circuit that light modulation is realized using power switch, the state analysis unit includes first comparator, the
One hysteresis loop comparator, the second hysteresis loop comparator, timer, first and door, second and door and NOT gate；The second of the power supply module
The feeder ear connection normal phase input end of first comparator, the normal phase input end of the first hysteresis loop comparator, the second hysteresis loop comparator
The input of normal phase input end and discharge module, the inverting input connection shut-off voltage of the first comparator provide end, institute
State the output end connection timer of first comparator first input end and first with the first input end of door, the timer
Output end reversely connection first and the second input of door afterwards, described first with the reset terminal of the output end connection status machine of door,
Visiting for first hysteresis loop comparator is limited to startup voltage, Xiamen is limited to stop voltage；First hysteresis loop comparator it is defeated
Go out to hold the second input, the clock signal input terminal of state machine and the input of NOT gate of connection timer, the NOT gate it is defeated
Go out end connection second and the first input end of door, visiting for second hysteresis loop comparator is limited to first voltage, Xiamen is limited to the
Two voltages, output end connection second and the second input of door of second hysteresis loop comparator, described second with the output of door
End connects the second control terminal of the discharge module；The shut-off voltage ＜ second voltages ＜ stops voltage ＜ first voltages ＜ and opened
Dynamic voltage.
In the described circuit that light modulation is realized using power switch, the power supply module also includes：
AC power, for providing alternating current；
Rectification filtering unit, for carrying out rectification and filtering to alternating current；
Power supply unit, for realizing that the circuit of light modulation is powered using power switch to described；
The AC power by power switch connect rectification filtering unit input, the rectification filtering unit it is defeated
Go out first feeder ear, the input of connection power supply unit and the input of power transfer module of the end for power supply module, the confession
The output end of electric unit is the second feeder ear of power supply module, the normal phase input end for connecting first comparator, the first hysteresis compare
The input of the normal phase input end of device, the normal phase input end of the second hysteresis loop comparator and discharge module.
In the described circuit that light modulation is realized using power switch, said supply unit includes first resistor, the first electric capacity
And voltage-regulator diode；One end of the first resistor is the input of power supply unit, the output end of connection rectification filtering unit, institute
The other end for stating first resistor is the output end of power supply unit, the one end for connecting the first electric capacity, the negative pole of voltage-regulator diode, first
The normal phase input end of comparator, the normal phase input end of the first hysteresis loop comparator, the second hysteresis loop comparator normal phase input end and put
The input of electric module；The other end ground connection of first electric capacity, the plus earth of the voltage-regulator diode.
In the described circuit that light modulation is realized using power switch, the discharge module includes the first current source, the second electricity
Stream source, first switch and second switch, the negative pole of second current source is the input of discharge module, the first current source of connection
Negative pole and first resistor the other end, the positive pole of second current source is grounded by second switch, the second switch
Control terminal is the second control terminal of discharge module, connection second and the output end of door；The positive pole of first current source passes through
One switch ground connection, the control terminal of the first switch is the first control terminal of discharge module, connection input voltage measurement module
Output end.
In the described circuit that light modulation is realized using power switch, the power transfer module includes the first diode, the
Two electric capacity and inductance, the negative pole of first diode are the input of power transfer module, connect the defeated of rectification filtering unit
Go out one end of end, one end of first resistor and the second electric capacity, the positive pole connection output current control unit of first diode
Output end and inductance one end, the other end of the inductance connects the other end of the second electric capacity, one end of second electric capacity
For the output cathode of power transfer module, the other end of second electric capacity is the output negative pole of power transfer module.
In the described circuit that light modulation is realized using power switch, the output current control unit includes power switch
Pipe, second resistance, the second comparator, in addition to：
Signal transacting subelement, exported for status signal to be converted into dimming control signal to power switch driving singly
Member；
Power switch drives subelement, for according to the dimming control signal, export the pwm signal of different duty to
The grid of power switch pipe；
The input of the signal transacting subelement is the output of the input, connection status machine of output current control unit
End, the first output end of the signal transacting subelement drive the grid of subelement connection power switch pipe by power switch,
Second output end of the signal transacting subelement connects the inverting input of the second comparator, the output of second comparator
The feedback input end of end connection signal transacting subelement, the source electrode of the power switch pipe connect the positive input of the second comparator
End, input voltage measurement module input, be also grounded by second resistance, the drain electrode of the power switch pipe is output current
One end of the output end of control unit, the positive pole for connecting the first diode and inductance.
In the described circuit that light modulation is realized using power switch, the rectification filtering unit includes rectifier bridge and the 3rd electricity
Hold, the output cathode of rectifier bridge connection one end of the 3rd electric capacity, one end of first resistor, the negative pole of the first diode and the
One end of two electric capacity, the output negative pole ground connection for arranging bridge, the other end ground connection of the 3rd electric capacity.
A kind of light fixture, including light source, in addition to the circuit as described above that light modulation is realized using power switch.
Compared to prior art, a kind of circuit and light fixture that light modulation is realized using power switch provided by the invention is described
Circuit includes power supply module, power transfer module, input voltage measurement module, discharge module and supply voltage state analysis mould
Block.The present invention is by input voltage measurement module, and when power supply module is closed, triggering discharge module is supplied the second of power supply module
Electric end electric discharge, makes the second supply voltage that power supply module exports quickly fall to stopping voltage from normal working voltage, avoids interior
Light source scintillation caused by portion's capacitor charge and discharge.Supply voltage state analyzing module exports in power switch closure, power supply module
Second supply voltage from stop voltage rising to start voltage when, output dimming control signal arrive power transfer module, with adjust
The voltage of light source, so, by the quick disconnection of power switch and closure, realize light modulation.In the second power supply of power supply module
When voltage is higher than first voltage and is less than startup voltage, supply voltage state analyzing module makes discharge module with the first electric current pair
Power supply module is discharged；Wherein, after first electric current is more than power switch disconnection, the electrochemical capacitor in power supply module is remaining
The charging current that voltage is formed, residual voltage is avoided higher than error starting caused by startup voltage.
Brief description of the drawings
Fig. 1 is the structured flowchart of the circuit provided by the invention that light modulation is realized using power switch.
Fig. 2 is the circuit diagram of the circuit provided by the invention that light modulation is realized using power switch.
Fig. 3 is the voltage waveform of each important node in the circuit provided by the invention that light modulation is realized using power switch
Figure.
Fig. 4 is the view of state machine in the circuit provided by the invention that light modulation is realized using power switch.
Fig. 5 is power switch driving subelement output in the circuit provided by the invention that light modulation is realized using power switch
Pwm signal oscillogram corresponding with power switch pipe source voltage Vcs.
Fig. 6 be it is provided by the invention using power switch realize light modulation circuit in, the power transfer module of embodiment 2
Circuit diagram.
Fig. 7 be it is provided by the invention using power switch realize light modulation circuit in, the power transfer module of embodiment 3
Circuit diagram.
Fig. 8 is the circuit that light modulation is realized using power switch shown in embodiment 4.
Fig. 9 is the voltage waveform of each important node in the circuit that light modulation is realized using power switch shown in embodiment 4
Figure.
Embodiment
The present invention provides a kind of circuit and light fixture that light modulation is realized using power switch, to make the purpose of the present invention, technology
Scheme and effect are clearer, clear and definite, and the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should manage
Solution, specific embodiment described herein only to explain the present invention, are not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, the circuit provided by the invention that light modulation is realized using power switch, including power supply module 10,
Supply voltage state analyzing module 20, power transfer module 30, input voltage measurement module 40 and discharge module 50.
The power supply module 10, for powering, specifically, for realizing that the circuit of light modulation carries using power switch to be whole
For powered by direct current, power switch S1, the power switch S1 are provided with the power supply module 10 for controlling power supply module
10 opening and closing, i.e. whether is the power supply of the controllable power supply modules 10 of the power switch S1.The power supply module 10 has
First feeder ear g1 and the second feeder ear g2, the first feeder ear g1 are for exporting the first supply voltage Vin to Power convert
Module 30；The second feeder ear g2 is used to export the second supply voltage VCC to supply voltage state analyzing module 20.Described
One feeder ear g1 is electrically connected by a resistance with the second feeder ear g2.
The supply voltage state analyzing module 20, for detecting the second supply voltage VCC of power supply module 10, in power supply
When switching S1 disconnections, the second supply voltage VCC of power supply module 10 less than voltage Vstop is stopped, power transfer module 30 is closed
With discharge module 50；Rise in the second supply voltage VCC of power switch S1 closures, power supply module 10 from voltage Vstop is stopped
To when starting voltage Von, dimming control signal is exported to power transfer module 30（One-shot voltage Von is often risen to, is changed
Dimming control signal）, the voltage to light source is exported with regulation power supply modular converter 30；In the second power supply of power supply module 10
When voltage VCC is higher than first voltage Vhigh and is less than startup voltage Von, make discharge module 50 with the first electric current to mould of powering
Second feeder ear g2 of block 10 is discharged.Wherein, after first electric current is more than power switch S1 disconnections, in power supply module 10
Electrochemical capacitor residual voltage formed charging current；Certainly, after first electric current closes not over power switch S1, supply
The electric current that electric module 10 normally exports.It is small that the stopping voltage Vstop is less than first voltage Vhigh, the first voltage Vhigh
In startup voltage Von.
The power transfer module 30, for the first supply voltage Vin to be converted to the operating voltage of light source.
The input voltage measurement module 40, for detecting the first supply voltage Vin of the power supply module 10, powering
When module 10 is closed, triggering discharge module 50 discharges the second feeder ear g2 of power supply module 10, makes power supply module 10
Second supply voltage VCC is quickly fallen to from normal working voltage Vclamp stops voltage Vstop.Specifically, the input electricity
Pressure detection module 40 indirectly judges power supply module by detecting the size of the inductive current rate of rise in power transfer module 30
10 the first supply voltage Vin change, illustrates when the inductive current rate of rise is less than predetermined value under the first supply voltage Vin
A certain specific voltage is dropped to, now exports a discharge signal so that the second supply voltage VCC is discharged to by discharge module 50
Vstop。
The discharge module 50, for discharging the second feeder ear g2 of power supply module 10.
First feeder ear g1 connections power transfer module 30 of the power supply module 10, the second of the power supply module 10 supplies
Electric end g2 connects power transfer module 30, the supply voltage state analysis mould by the supply voltage state analyzing module 20
The output end of block 20 connects the first control terminal a of discharge module 50, the supply voltage shape by input voltage measurement module 40
State analysis module 20 connects the second control terminal b of the discharge module 50, and the input of the discharge module 50 connects the confession
Second feeder ear g2 of electric module 10.
So, by the present invention, when power cutoff switchs S1, the second supply voltage VCC of power supply module 10 is quick
Drop to from operating voltage Vclamp and stop voltage Vstop, be higher than first voltage in the second supply voltage VCC of power supply module 10
Vhigh and less than start voltage Von when, discharge module 50 is entered with the first electric current to the second feeder ear g2 of power supply module 10
Row electric discharge, so as to avoid the first feeder ear g1 of power supply module 10 residual voltage（First supply voltage Vin）Make the second confession
Piezoelectric voltage VCC, which rises to, starts voltage Von, false triggering dimming control signal.After quick-make power switch S1, the first power supply
Voltage Vin voltages are higher so that the second supply voltage VCC of power supply module 10 rises to startup voltage from voltage Vstop is stopped
During Von, dimming control signal is exported, realizes light modulation.The circuit provided by the invention that light modulation is realized using power switch, is only needed
It is quick to disconnect and close power switch, you can to realize the light modulation to light source, be not in the existing light modulation mistake of prior art.
Also referring to Fig. 2, the supply voltage state analyzing module 20 specifically includes state analysis unit 210, state
Machine U1 and output current control unit 220.
The state analysis unit 210, for detecting the second supply voltage VCC of power supply module 10, in the second power supply electricity
When the duration of states of the pressure VCC higher than shut-off voltage Voff and less than startup voltage Von exceedes the scheduled time, to state
Machine U1 resets, and state machine U1 is entered first state when electric on next time；Disconnect in power switch S1, the of power supply module 10
When two supply voltage VCC are less than voltage Vstop is stopped, discharge module 50 is closed, and close by output current control unit 220
Power transfer module 30；Power switch S1 closure, power supply module 10 the second supply voltage VCC from stop voltage Vstop on
It is raised to after starting voltage Von, changes state machine U1 state, makes status signal corresponding to state machine U1 outputs；In power supply module
When 10 the second supply voltage VCC is higher than first voltage Vhigh and is less than startup voltage Von, make discharge module 50 with first
Electric current discharges the second feeder ear g2 of power supply module 10.The scheduled time is set as needed, can determine whether institute
State and realize whether the circuit of light modulation thoroughly closes using power switch（Power switch S1 is not closed again）.It is described in the present embodiment
The scheduled time is 4 seconds, i.e. after power switch S1 disconnects 4 seconds, state analysis unit 210 resets to state machine U1, the electricity
Road is thoroughly closed.The present invention is determined predetermined resetting time by chip internal timer so that the reset to state machine U1 will not
Influenceed by electrochemical capacitor residual voltage, resetting time section precision substantially will height compared with the documents in background technology.
The state machine U1, for the control according to state analysis unit 210, export corresponding to status signal give output electricity
Flow control unit 220；In other words, the state machine U1 changes the state of itself according to the control of state analysis unit.It is described
Multiple states can be arranged as required in state machine U1.In the present embodiment, first state, second are provided with the state machine U1
State and the third state, wherein, the first state is the original state after state machine U1 resets.The corresponding electricity of the first state
The electric current of the output of source modular converter 30 10%, i.e. light-source brightness is most dark.The second state corresponding power modular converter 30 exports
100% electric current, i.e. light-source brightness is most bright.The electric current of the output of third state corresponding power modular converter 30 40%, i.e. light
Source brightness is medium.State machine U1 changes state by the sequential loop of first state, the second state and the third state.Certainly, this
It is the situation in the present embodiment, in fact, first state, the second state, the third state and the output current of power transfer module 30
Size（Dim brightness）Corresponding relation arbitrarily can voluntarily set.Increase/reduction state and the gear of light modulation brightness also not shadow
Ring the light modulation of the present invention.
The output current control unit 220, power supply turn is output to for status signal to be converted into dimming control signal
Block 30 is changed the mold, the voltage to light source is exported with regulation power supply modular converter.Specifically, the output current control unit 220 connects
State machine U1 status signal is received, changes the output current of power transfer module 30, reaches the purpose of light modulation.
The state analysis unit 210 passes through the state machine U1 connections output current control unit 220.
In other words, the state analysis unit 210 detects the second supply voltage VCC of power supply module 10, in power supply mould
Second supply voltage VCC of block 10 exceedes higher than shut-off voltage Voff and less than the duration in the state of starting voltage Von
During the scheduled time, state machine U1 is resetted, state machine U1 is entered first state when electric on next time；The state analysis list
Member 210 closes electric discharge when power switch S1 disconnects, the second supply voltage VCC of power supply module 10 is less than stopping voltage Vstop
Module 50, and power transfer module 30 is closed by output current control unit 220；The state analysis unit 210 is in power supply
Switch S1 closures, the second supply voltage VCC of power supply module 10 are risen to from stopping voltage Vstop after starting voltage Von, are changed
State machine U1 state, the state machine U1 according to the control of state analysis unit 210, export corresponding to status signal to output
Status signal is converted into dimming control signal and is output to power supply by current control unit 220, the output current control unit 220
Modular converter 30, the voltage to light source is exported with regulation power supply modular converter 30；The state analysis unit 210 is in power supply module
When 10 the second supply voltage VCC is higher than first voltage Vhigh and is less than startup voltage Von, make discharge module 50 with first
Electric current discharges the second feeder ear g2 of power supply module 10.
Please continue to refer to Fig. 2, the state analysis unit 210 includes first comparator Q1, the first hysteresis loop comparator Q2, the
Two hysteresis loop comparator Q3, timer T1, first and door Q4, second and door Q6 and NOT gate Q5；The second of the power supply module 10 supplies
Electric end g2 connection first comparators Q1 normal phase input end, the first hysteresis loop comparator Q2 normal phase input end, the second hysteresis compare
Device Q3 normal phase input end and the input of discharge module 50, the inverting input connection shut-off voltage of the first comparator Q1
Voff provides end, and the of the output end connection timer T1 of first comparator Q1 first input end 1 and first and door Q4
One input, the output end of the timer T1 reversely connect first the second input with door Q4, described first and door Q4 afterwards
Output end connection status machine U1 reset terminal（Reset ends）, the inverting input of the first hysteresis loop comparator Q2 is provided with
Upper threshold and Lower Threshold, visiting for the first hysteresis loop comparator Q2 is limited to startup voltage Von, Xiamen is limited to stop voltage
Vstop；The output end connection timer T2 of the first hysteresis loop comparator Q2 the second input 2, state machine U1 clock letter
Number input（CLK ends）With NOT gate Q5 input, the output end connection second of the NOT gate Q5 and door Q6 first input end,
The inverting input of the second hysteresis loop comparator Q3 is provided with Upper threshold and Lower Threshold, and the second hysteresis loop comparator Q3's is upper
Thresholding is the output end connection second that first voltage Vhigh, Xiamen are limited to second voltage Vlow, the second hysteresis loop comparator Q3
The second control terminal b of the discharge module 50 is connected with door Q6 output end with door Q6 the second input, described second；It is described
Turn off voltage Voff ＜ second voltage Vlow ＜ and stop the voltage Vstop ＜ first voltage Vhigh ＜ startup normal works of voltage Von ＜
Make voltage Vclamp.The timing of the timer T1 is exactly the scheduled time.
The power supply module 10 also includes AC power AC, rectification filtering unit 110 and power supply unit 120.
The AC power AC, for providing alternating current；That is, described AC power AC is civil power.
The rectification filtering unit 110, for carrying out rectification and filtering to alternating current, export the first supply voltage Vin to
Power transfer module 30 is powered.
Said supply unit 120, for exporting the second supply voltage VCC to the electricity that light modulation is realized using power switch
Road powers；That is, powered to supply voltage state analyzing module 20, power transfer module 30 and input voltage measurement module 40.
The AC power AC passes through the input of power switch S1 connections rectification filtering unit 110, the rectifying and wave-filtering
The output end of unit 110 is the first feeder ear g1 of power supply module 10, the input and Power convert mould of connection power supply unit 120
The input of block 30, the output end of said supply unit 120 are the second feeder ear g2 of power supply module 10, connect first comparator
Q1 normal phase input end, the first hysteresis loop comparator Q2 normal phase input end, the second hysteresis loop comparator Q3 normal phase input end and put
The input of electric module 50.
Said supply unit 120 includes first resistor R1, the first electric capacity C1 and voltage-regulator diode D1；The first resistor R1
One end for power supply unit 120 input, connect rectification filtering unit 110 output end, the first resistor R1's is another
Hold the output end for power supply unit 120, connection the first electric capacity C1 one end, voltage-regulator diode D1 negative pole, first comparator Q1
Normal phase input end, the first hysteresis loop comparator Q2 normal phase input end, the second hysteresis loop comparator Q3 normal phase input end and electric discharge
The input of module 50；The other end ground connection of the first electric capacity C1, the plus earth of the voltage-regulator diode D1.In normal work
When making, the voltage-regulator diode D1 can be by the output voltage VCC of power supply unit 120（Second supply voltage）Stabilization is in operating voltage
Vclamp。
The discharge module 50 includes the first current source I1, the second current source I2, first switch S2 and second switch S3, institute
The negative pole for stating the second current source I2 is the input of discharge module 50, the first current source I1 of connection negative pole and first resistor R1
The other end, the positive pole of the second current source I2 are grounded by second switch S3, and the control terminal of the second switch S3 is electric discharge
Second control terminal b of module 50, connection second and door Q6 output end；The positive pole of the first current source I1 passes through first switch
S2 is grounded, and the control terminal of the first switch S2 is the first control terminal a of discharge module 50, connects input voltage measurement module 40
Output end.The first current source I1 and the second current source I2 is continuous current source, can be single to power supply with constant electric current
The output voltage VCC of member 120 is discharged.
Power transfer module 30 provided by the invention, there is a variety of particular circuit configurations, in the present embodiment, the Power convert
Module 30 belongs to non-isolated pressure-reducing structure, specifically includes the first diode D2, the second electric capacity C2 and inductance L1, and the described 1st
Pole pipe D2 negative pole is the input of power transfer module 30, the output end for connecting rectification filtering unit 110, first resistor R1
One end and the second electric capacity C2 one end, the output end of the positive pole connection output current control unit 220 of the first diode D2
With inductance L1 one end, the other end of the inductance L1 connects the second electric capacity C2 other end, one end of the second electric capacity C2
For the output cathode of power transfer module 30, the positive pole of connection light source, the other end of the second electric capacity C2 is Power convert mould
The output negative pole of block 30, the negative pole for connecting light source.
The output current control unit 220 includes power switch pipe Q7, second resistance R2, the second comparator Q8, signal
Handle subelement and power switch driving subelement.
The signal transacting subelement, for by status signal be converted into dimming control signal export give power switch drive
Subelement.
The power switch drives subelement, for according to the dimming control signal, the PWM for exporting different duty to believe
Number give power switch pipe Q7 grid.
The input of the signal transacting subelement is input, the connection status machine U1 of output current control unit 220
Output end, the first output end of the signal transacting subelement passes through power switch and drives subelement to connect power switch pipe Q7
Grid, the second output end of the signal transacting subelement connects the second comparator Q8 inverting input, second ratio
The feedback input end of output end connection signal transacting subelement compared with device Q8, the ratio of source electrode connection second of the power switch pipe Q7
The input of normal phase input end, input voltage measurement module 40 compared with device Q8, also it is grounded by second resistance R2, the power is opened
The drain electrode for closing pipe Q7 is the one of the output end of output current control unit 220, the first diode D2 of connection positive pole and inductance L1
End.
It follows that the output current control unit 220 is input to the signal of power switch pipe Q7 grids by changing
Dutycycle and/or the mode of inductive current cause power transfer module 30 to export specific output current, so as to realize to light
The light modulation in source.
The rectification filtering unit 110 includes rectifier bridge and the 3rd electric capacity C3, the output cathode connection of the rectifier bridge the
Three electric capacity C3 one end, first resistor R1 one end, the first diode D2 negative pole and the second electric capacity C2 one end, the arrangement
The output negative pole ground connection of bridge, the other end ground connection of the 3rd electric capacity C3.
Also referring to Fig. 3, after power switch S1 disconnects for a long time, the voltage Vin of first resistor R1 one end（First power supply
Voltage）It will all drop to low-voltage with the output voltage VCC of power supply unit 120.After power switch S1 is closed, Vin rises
For high voltage, and first resistor R1 can be passed through（Start resistance）First electric capacity C1 is charged, VCC is begun to ramp up, on VCC
Rise slope be K1=（Vin-VCC）/(R1*C1).Before VCC rises to Voff, first comparator Q1 output Vreset is low
Level, all control modules are resetted, i.e. timer T1 is cleared, and state machine U1 is reset original state（First shape
State）, wait VCC to rise to Von and cause the first hysteresis loop comparator Q2 output Vwork the clock from low level to high level occur
Signal triggering state machine U1 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 is
Second state, P3 are the third state, and corresponding power modular converter 30 exports 10% electric current, 100% electric current, 40% electricity respectively
Stream, often by once quick cut-off/close power switch S1 Dimming operation, Vwork a rising edge is occurred makes state
Machine U1 jumps to NextState, exports corresponding electric current to light source；In order that for the first time output 100% electric current, it is necessary to
State machine U1 is reset to original state P1 when VCC is less than Voff, now Vwork signals are low level, and output current control is single
Member 220 is stopped, and state machine U1 state is changed to the second state by Vwork signals rising edge after VCC rises to Von
P2, while output current control unit 220 is started working, and makes the electric current of the output of power transfer module 30 corresponding 100%.
Meet Vhigh when VCC rises to<VCC<Von, the first hysteresis loop comparator Q2 export low level, and the second hysteresis compares
Device Q3 output high level causes second with door Q6 output Vdis to be high level, electricity of the discharge module 50 using size as the first electric current
Stream to VCC discharge, cause the VCC rates of rise reduce, now the VCC rates of rise be changed into K2=[（Vin-VCC）/ R1-I2]/C1, by
It is higher in Vin（Vin-VCC）/ R1 is more than I2, therefore VCC can continue to rise；When VCC rises to Von, the first hysteresis loop comparator Q2
Output Vwork from low level be changed into high level and produce a rising edge triggering state machine U1 changing into state P2, while Vdis becomes
Stop discharging to reduce power consumption to VCC for low level；Output current control unit 220 and power transfer module 30 are started working.
Timer T1 is in timing during VCC rises to Von from Voff, but (this time required to generally VCC rises to Von from Voff
Invention is less than 1 second) it is less than timer T1 timing（That is the scheduled time, it is 4 seconds）, therefore timer T1 is less than timing terminates
Through being resetted by Vwork signals, therefore the signal resetted to state machine U1 will not be produced.
Signal transacting subelement in output current control unit 220 receives the status signal of state machine U1 outputs（It is defeated
Go out current needs information）, according to pre-set method, by adjust suitable Vth and/or pwm signal dutycycle and/
Or switching frequency is output to power transfer module 30 so that power transfer module 30 exports the electric current set in advance.
Input voltage measurement module 40 is by detecting whether the rate of rise of Vcs signals judges Vin voltages in this example
Power down, its principle are：Vcs rate of rise K3=R2* (Vin-Vout)/L1, its waveform are as shown in Figure 5；Specific set for a certain
Count R2, Vout and L1 be known constant parameter, therefore rate of rise K3 with（Vin-Vout）It is directly proportional, can be by detecting K3 number
Value obtains Vin situation indirectly.When K3 power down occurs less than a certain setting numbers illustrated Vin（Power switch S1 disconnects）, input
Voltage detection module 40 exports a discharge signal to discharge module 50 and electric current of the discharge module 50 using size as I1 is entered to VCC
Quickly electric discharge, VCC voltages quickly drop to Vstop to row from clamp voltage Vclamp（VCC causes the first hysteresis less than Vstop
Comparator Q2 output low levels stop the work of input voltage measurement module 40, and I1 paths stop electric discharge）, such as Fig. 3 power switches
S1 disconnects the waveform at moment, although hereafter having residual voltage to charge the first electric capacity C1 on electrochemical capacitor, now
Vdis is high level, and discharge module 50 is discharged the first electric capacity C1 with the first electric current, and this discharge current is more than aftercurrent
To the first electric capacity C1 charging current, therefore VCC voltages continue to decline, and until dropping to Vlow, hereafter Vdis is changed into low level, I2
Path stops electric discharge, and VCC voltages are changed into rising due to charging of the residual voltage to the first electric capacity C1, until rising to Vhigh,
I2 paths are discharged VCC and are changed into declining again, and when VCC is re-lowered to Vlow, I2 discharge paths are again switched off, if now
When residual voltage is sufficiently large, VCC constantly changes between Vhigh and Vlow, is less than when residual voltage is reduced to charging current
The electricity consumption of other functional modules, VCC voltages slowly decline, before VCC drops to Voff, and before timer T1 timing terminates
If power switch S1 is closed again, VCC voltages will be climbed to Von, and its process is identical with initial powering up process, works as VCC
Von is risen to, the first hysteresis loop comparator Q2, which exports a rising edge, makes state machine U1 jump to next output state, system output pair
The electric current answered（Correspond to the third state in this example, 40% when output current is the second state）.Exactly between Vhigh and Von
One the second current source I2 of increase discharge path, which can just avoid residual voltage VCC is charged to Von, causes false triggering state
Machine U1；And unnecessary operating current is closed between Vlow and Voff to reach longer using less first electric capacity C1
Hold time.So far complete dimming process is completed once, quickly power switch S1 cut-off/closes will repeat one every time
Dimming process more than secondary, output current change once.
Fig. 3 also show shutdown reseting procedure, when power switch S1 is again off and can not in scheduled time Trst
Close again, timer T1 will reset to state machine U1 by force（It is reset to original state）, state machine U1 be reset with
Afterwards, no matter before state machine U1 which kind of state be in, when power switch S1 is closed again, when system works again, state machine U1
First state, and electric current corresponding to output must be worked in.In Fig. 3, Vrst is the voltage of state machine U1 reset terminal.
It follows that the circuit provided by the invention that light modulation is realized using power switch, is had real compared with prior art
The advantages of now circuit structure of light modulation/toning is simple, and cost is low, highly reliable, and uniformity is good.
Power transfer module 30 provided by the invention has a variety of circuit structures, referring to Fig. 6, in example 2（Upper one is real
It is embodiment 1 to apply example）, it is that power transfer module 30 is connected as boost configuration, power switch pipe Q7 source with the difference of implementation 1
The pole tension Vcs rate of rise is changed into K3=R2*Vin/L1, and input voltage measurement module 40 can be obtained by detecting K3 numerical value
It is same as Example 1 to Vin voltage condition, other modules and light modulation principle of the circuit.
Referring to Fig. 7, in embodiment 3, power transfer module 30 is connected as isolating flyback structures, power switch pipe
The Q7 source voltage Vcs rates of rise are changed into K3=R2*Vin/Lp, and input voltage measurement module 40 can be by detecting K3 number
Vin voltage condition is worth to, other modules and light modulation principle of the circuit are same as Example 1.
Referring to Fig. 8, in example 4, it is with the difference of embodiment 1, input voltage measurement module and power supply module
Share.Fig. 9 is the waveform of important node in embodiment 4.Vin drops to low-voltage because power switch S1 disconnects, VCC electricity
Pressure declines therewith, it is possible to by detecting whether VCC voltages are less than Vstop to judge whether power switch S1 disconnects；Due to
Vstop has descended to Vstop therefore VCC is discharged without discharge module, and discharge module 50 also just only needs discharge circuit all the way.It is real
Apply in example 4, power transfer module 30 can be using any one circuit structure in embodiment 1, embodiment 2 and embodiment 3.In reality
Apply in example 4, other modules and its light modulation principle are same as Example 1.
Based on above-mentioned 4 embodiments, the present invention also provides a kind of light fixture, including light source and is opened as described above using power supply
Close the circuit for realizing light modulation.Because the structure of the light fixture, light modulation principle have been carried out being described in detail in the above-described embodiments,
This is repeated no more.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (6)
- A kind of 1. circuit that light modulation is realized using power switch, it is characterised in that including：The power supply module of power switch is provided with, the power switch is used for the opening and closing for controlling power supply module；The power supply module has the first feeder ear and the second feeder ear, and first feeder ear is used to export the first supply voltage To power transfer module；Second feeder ear is used for output second and supplies voltage to supply voltage state analyzing module；Power transfer module, for the first supply voltage to be converted to the operating voltage of light source；Input voltage measurement module, for when power supply module is closed, triggering second feeder ear of the discharge module to power supply module Discharged, the second supply voltage is quickly fallen to stopping voltage from normal working voltage；Discharge module, for discharging the second feeder ear of power supply module；Supply voltage state analyzing module, for detecting the second supply voltage of power supply module, in power switch disconnection, power supply mould When second supply voltage of block is less than voltage is stopped, power transfer module and discharge module are closed；In power switch closure, power supply Second supply voltage of module from stop voltage rising to start voltage when, output dimming control signal to power transfer module, Voltage to light source is exported with regulation power supply modular converter；Power supply module the second supply voltage higher than first voltage and low When voltage is started, discharge module is set to be discharged with the first electric current the second feeder ear of power supply module；After first electric current is more than power switch disconnection, the charging that the electrochemical capacitor residual voltage in power supply module is formed is electric Stream；The stopping voltage being less than first voltage, and the first voltage, which is less than, starts voltage；The first feeder ear connection power transfer module of the power supply module, the second feeder ear of the power supply module passes through described Supply voltage state analyzing module connects power transfer module, and an output end of the supply voltage state analyzing module passes through defeated Enter the first control terminal of voltage detection module connection discharge module, another output end of the supply voltage state analyzing module connects The second control terminal of the discharge module is connect, the input of the discharge module connects the second feeder ear of the power supply module；The supply voltage state analyzing module includes state analysis unit, state machine and output current control unit；Second supply voltage of the state analysis unit detection power supply module, is higher than in the second supply voltage of power supply module and closes When power-off is pressed and exceedes the scheduled time less than the duration for starting voltage, to resets, make state machine next time Enter first state when upper electric；The state analysis unit is less than in the second supply voltage of power switch disconnection, power supply module When stopping voltage, discharge module is closed, and power transfer module is closed by output current control unit；The state analysis list Member power switch closure, power supply module the second supply voltage from stop voltage rising to start voltage after, change state machine State, the state machine according to the control of state analysis unit, export corresponding to status signal give output current control unit, Status signal is converted into dimming control signal and is output to power transfer module by the output current control unit, with regulation power supply Modular converter exports the voltage to light source；The state analysis unit is higher than first voltage in the second supply voltage of power supply module And during less than starting voltage, discharge module is set to be discharged with the first electric current the second feeder ear of power supply module；The state analysis unit includes first comparator, the first hysteresis loop comparator, the second hysteresis loop comparator, timer, first With door, second and door and NOT gate；It is the normal phase input end of the second feeder ear connection first comparator of the power supply module, first stagnant Return normal phase input end, the normal phase input end of the second hysteresis loop comparator and the input of discharge module of comparator, first ratio Inverting input connection shut-off voltage compared with device provides end, the first input of the output end connection timer of the first comparator End and first with the first input end of door, reverse the second input of connection first and door afterwards of the output end of the timer, institute State the first reset terminal with the output end connection status machine of door, the visiting of first hysteresis loop comparator be limited to start voltage, under Thresholding is stopping voltage；The second input, the clock of state machine of the output end connection timer of first hysteresis loop comparator The input of signal input part and NOT gate, the output end connection second of the NOT gate and the first input end of door, described second is stagnant Return that visiting for comparator is limited to first voltage, Xiamen is limited to second voltage, the output end of second hysteresis loop comparator connection the Two with the second input of door, described second is connected the second control terminal of the discharge module with the output end of door；The shut-off Voltage ＜ second voltages ＜ stops voltage ＜ first voltages ＜ and starts voltage；The power supply module also includes：AC power, for providing alternating current；Rectification filtering unit, for carrying out rectification and filtering to alternating current；Power supply unit, for realizing that the circuit of light modulation is powered using power switch to described；The AC power connects the input of rectification filtering unit, the output end of the rectification filtering unit by power switch For the first feeder ear of power supply module, the input of power supply unit and the input of power transfer module are connected, the power supply is single The output end of member is the second feeder ear of power supply module, the normal phase input end for connecting first comparator, the first hysteresis loop comparator The input of normal phase input end, the normal phase input end of the second hysteresis loop comparator and discharge module；Said supply unit includes first resistor, the first electric capacity and voltage-regulator diode；One end of the first resistor is single for power supply The input of member, the output end for connecting rectification filtering unit, the other end of the first resistor are the output end of power supply unit, connected Connect one end of the first electric capacity, the negative pole of voltage-regulator diode, the normal phase input end of first comparator, the positive of the first hysteresis loop comparator The input of input, the normal phase input end of the second hysteresis loop comparator and discharge module；The other end ground connection of first electric capacity, The plus earth of the voltage-regulator diode.
- 2. the circuit according to claim 1 that light modulation is realized using power switch, it is characterised in that the discharge module bag The first current source, the second current source, first switch and second switch are included, the negative pole of second current source is the defeated of discharge module Enter the other end at end, the negative pole of the first current source of connection and first resistor, the positive pole of second current source passes through second switch Ground connection, the control terminal of the second switch is the second control terminal of discharge module, connection second and the output end of door；Described first The positive pole of current source is grounded by first switch, and the control terminal of the first switch is the first control terminal of discharge module, connection The output end of input voltage measurement module.
- 3. the circuit according to claim 2 that light modulation is realized using power switch, it is characterised in that the Power convert mould Block includes the first diode, the second electric capacity and inductance, and the negative pole of first diode is the input of power transfer module, connected One end of the output end of rectification filtering unit, one end of first resistor and the second electric capacity is connect, the positive pole of first diode connects The output end of output current control unit and one end of inductance are connect, the other end of the inductance connects the other end of the second electric capacity, One end of second electric capacity is the output cathode of power transfer module, and the other end of second electric capacity is power transfer module Output negative pole.
- 4. the circuit according to claim 3 that light modulation is realized using power switch, it is characterised in that the output current control Unit processed includes power switch pipe, second resistance, the second comparator, in addition to：Signal transacting subelement, for by status signal be converted into dimming control signal export give power switch drive subelement；Power switch drives subelement, for according to the dimming control signal, exporting the pwm signal of different duty to power The grid of switching tube；The input of the signal transacting subelement is the input of output current control unit, the output end of connection status machine, First output end of the signal transacting subelement drives the grid of subelement connection power switch pipe by power switch, described Second output end of signal transacting subelement connects the inverting input of the second comparator, and the output end of second comparator connects Connect the feedback input end of signal transacting subelement, the source electrode of the power switch pipe connect the normal phase input end of the second comparator, The input of input voltage measurement module, also it is grounded by second resistance, the drain electrode of the power switch pipe is output current control One end of the output end of unit processed, the positive pole for connecting the first diode and inductance.
- 5. the circuit according to claim 4 that light modulation is realized using power switch, it is characterised in that the rectifying and wave-filtering list Member includes rectifier bridge and the 3rd electric capacity, one end of output cathode the 3rd electric capacity of connection of the rectifier bridge, one end of first resistor, One end of the negative pole of first diode and the second electric capacity, the rectifier bridge output negative pole ground connection, the 3rd electric capacity it is another End ground connection.
- 6. a kind of light fixture, including light source, it is characterised in that the light fixture also includes as described in claim 1-5 any one The circuit of light modulation is realized using power switch.
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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 |
| CN109195274B (en) * | 2018-11-07 | 2024-06-14 | 无锡恒芯微科技有限公司 | DIM light-adjusting circuit for avoiding OVP false triggering |
| 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 |
| 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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