CN105792433B - Switching Power Supply driving chip and controllable silicon light modulation LED drive circuit - Google Patents
Switching Power Supply driving chip and controllable silicon light modulation LED drive circuit Download PDFInfo
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- CN105792433B CN105792433B CN201610244501.3A CN201610244501A CN105792433B CN 105792433 B CN105792433 B CN 105792433B CN 201610244501 A CN201610244501 A CN 201610244501A CN 105792433 B CN105792433 B CN 105792433B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention belongs to technical field of constant current drive, the present invention provides switch power source driving circuit and controllable silicon light modulation LED drive circuit, Switching Power Supply driving chip is connected with input stage current rectifying and wave filtering circuit and output-stage circuit, and the input rectifying filter circuit connects controllable silicon dimmer, and it includes：Dimming controlling module, voltage sample module, constant-current control module, error amplifier, conducting duration control module, demagnetization control module, trigger and switching device；Gauze is tangentially handled by controllable silicon dimmer, according to tangential angle come the corresponding brightness for changing illuminator lamp, by changing the reference voltage that the in-phase input end of error amplifier is inputted, so as to change the size of current for flowing through LED, and then change the purpose that the brightness of LED reaches controllable silicon light modulation, maximum output current is set not fluctuated with gauze and output voltage, and dimming scope is strong, cost performance is high.
Description
Technical field
Driven the invention belongs to technical field of constant current drive, more particularly to Switching Power Supply driving chip and controllable silicon light modulation LED
Dynamic circuit.
Background technology
Since human consciousness to must every possible means energy-saving and emission-reduction, after the pressing issues that atmospheric warming could be solved, such as
What reduce electric consumption on lighting just as one it is important the problem of put on the agenda come because electric consumption on lighting accounts for the 20% of total energy consumption.Make
For the green illumination light source of a new generation, high brightness light emitting diode LED (Light Emitting Diode) has than incandescent lamp
More than 5 times of energy-conservation, will also save one times or so of advantage, and also contain unlike fluorescent lamp, electricity-saving lamp than fluorescent lamp, electricity-saving lamp
Mercury.If can also be saved using light modulation, then be also very important energy saving means.But the past, all light sources were not all allowed very much
Light modulation is easily realized, and easily dims exactly the one of LED very big advantage.Because need not turn on light in fact in many occasions or
At least need not be so bright, but lamp is but opened very bright, the street lamp of period at such as midnight to dawn；Subway carriage is reached from underground
The illuminating lamp during ground of suburb in compartment；Close to the office, school, factory of window etc. more commonly when sunny
Fluorescent lamp causes to waste many electric energy, because high-pressure mercury lamp, fluorescent lamp, ceiling lamp, electricity-saving lamp are basic all in luminance
It can not dim, use instead now after LED, much electricity can be saved.
The world LED illumination brand manufacturers such as Philip, Ou Silang, Samsung, General Electric and grace intelligence Pu (NXP), meaning method
The control IC such as semiconductor (ST) manufacturers have all put into the LED illumination product that substantial amounts of manpower and materials develop tunable optical, push illumination
Market development.Current LED light regulating technologies, mainly comprising following several：
The first light-dimming method is simulation light regulating technology：The brightness for changing LED is easily achieved, simplest is to change to drive
Streaming current, because LED brightness is almost directly proportional with driving current.Nearly all constant current chip has an inspection
The interface of electric current is surveyed, is that the reference voltage of the voltage and chip internal detected compares, carrys out the constant of control electric current.But this
The usual very little of value of detection resistance, only several Europe of zero point, if to fill the potentiometer in a several Europe of zero point on the wall to adjust electricity
Stream is unlikely, because lead resistance also has several Europe of zero point, some chips provide a control voltage interface,
Its output constant current value can just be changed by the control voltage for changing input.
Second of light-dimming method is that pulse width modulation (PWM) dims method.PWM is a kind of to enter line number to analog signal level
The method of word coding.By the use of high-resolution counter, the dutycycle of square wave is modulated for believing a physical simulation
Number level encoded.Pwm signal is still numeral, because at given any moment, the direct current supply of full amplitude will
There is (ON) completely, or entirely without (OFF).Voltage or current source are the repetition pulse sequences with a kind of logical (ON) or disconnected (OFF)
Row are added to what fictitious load got on, when being that direct current supply is added in load when conducting, are when shut-off
When being that power supply is disconnected.
The third light-dimming method is controllable silicon phase-controlled dimming method, and controllable silicon light modulation technology is realized using phase control method
Light modulation, for common direction blocking-up type controllable silicon, its lock properties of flow is shown as when controllable silicon is plus the same of positive anode voltage
When again plus appropriate positive control voltage when, controlled silicon conducting；Still turned on even if removing and can control after gate leve control voltage,
Just turned off until being less than controllable silicon after the maintenance electric current of controllable silicon itself plus direction anode voltage or anode current.Common can
Control silicon light modulator realizes forward position triggering phase-controlled dimming using the characteristic.
Controllable silicon has formed alliance with incandescent lamp Halogen lamp LED, occupies very big light modulation market.If LED wants to take
The position of incandescent lamp and halogen lamp for controllable silicon light modulation, it is just also compatible with controllable silicon light modulation.
Specifically, pacified on the incandescent lamp for being mounted with controllable silicon light modulation at some or the place of Halogen lamp LED, wall
Fill and two connecting lines for leading to light fixture have also been mounted with the dimmer switch and knob of controllable silicon, wall.Change on wall
Reverse-blocking tetrode thyristor and to increase connecting line number be not so easily, simplest method is exactly what is all constant, only
Incandescent lamp on lamp holder is changed, changing the LED bulb with compatible silicon controlled dimming function just can be with.
At present, maximum output current in the prior art in controllable silicon light modulation technology all can be by input gauze and output electricity
The fluctuation of pressure and fluctuate, it is too big and bring harm to easily cause maximum output current fluctuation in the country of some gauze less stables
Risk.
In summary, maximum output current in the prior art in controllable silicon light modulation technology is by input gauze and output electricity
The fluctuation of pressure and fluctuate the problem of causing to have risk.
The content of the invention
It is an object of the invention to provide Switching Power Supply driving chip and controllable silicon light modulation LED drive circuit, it is intended to solves
The maximum output current in controllable silicon light modulation technology is fluctuated and led by the fluctuation of input gauze and output voltage in the prior art
The problem of there is risk in cause.
First aspect present invention provides a kind of Switching Power Supply driving chip, itself and input stage current rectifying and wave filtering circuit and output stage
Circuit is connected, and the input rectifying filter circuit connects controllable silicon dimmer, and the input rectifying filtering receives the controllable silicon
The cut voltage of light modulator output, and it is coupled to the power supply by the cut voltage commutation into DC voltage and after being filtered
Driving chip, the output-stage circuit driving LED load work；The Switching Power Supply driving chip includes：Dimming controlling module,
Voltage sample module, constant-current control module, error amplifier, conducting duration control module, demagnetization control module, trigger and
Switching device；
The input of the demagnetization control module connects the output-stage circuit, and the input of the demagnetization control module connects
The set end of the trigger is connect, the demagnetization control module is according to the output voltage of the output-stage circuit to the trigger
Carry out set；
The input of the dimming controlling module connects the input rectifying filter circuit, the dimming controlling module it is defeated
Go out the first input end of the end connection error amplifier, filtered DC voltage is converted into ginseng by the dimming controlling module
Voltage is examined, and the error amplifier is given by the reference voltage output；
The control end of the voltage sample module connects the output end of the trigger, the voltage of the voltage sample module
Collection terminal connects the output end of the switching device, and the output end of the voltage sample module connects the constant-current control module
Input, the control signal that the voltage sample module is exported according to the trigger gathers the electricity that the switching device is exported
Pressure, and collection voltages are exported to the constant-current control module；
The control end of the constant-current control module connects the output end of the constant-current control module, the constant-current control module
Output end connect the second input of the error amplifier, the control that the constant-current control module is exported according to the trigger
Signal processed to the collection voltages export average voltage after current constant control to the error amplifier；
The input of the output end connection conducting duration control module of the error amplifier, the error amplifier
The reference voltage and the average voltage are compared, and comparative result is exported to the conducting duration control module；
The control end of the conducting duration control module connects the output end of the trigger, and the conducting duration controls mould
The output end of block connects the reset terminal of the trigger, and the conducting duration control module is according to the comparative result and described touches
The control signal for sending out device output controls the ON time of the switching device.
A kind of controllable silicon light modulation LED drive circuit of second aspect of the present invention offer, including controllable silicon dimmer, input stage are whole
Filter circuit and output-stage circuit are flowed, the controllable silicon light modulation LED drive circuit also includes above-mentioned Switching Power Supply driving core
Piece.
The embodiment of the present invention provides switch power source driving circuit and controllable silicon light modulation LED drive circuit, passes through thyristor regulating
Light device is tangentially handled gauze, according to tangential angle come the corresponding brightness for changing illuminator lamp, by changing error
The reference voltage that the in-phase input end of amplifier is inputted, so as to change the size of current for flowing through LED, and then changes LED
Brightness reach the purpose of controllable silicon light modulation, maximum output current is not fluctuated with gauze and output voltage, and dimming scope is strong,
Cost performance is high.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In required for the accompanying drawing that uses be briefly described, it should be apparent that, drawings in the following description are only some of the present invention
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is the structural representation of controllable silicon light modulation LED drive circuit provided in an embodiment of the present invention；
Fig. 2 is the particular circuit configurations figure of Switching Power Supply constant-current driven chip provided in an embodiment of the present invention；
Fig. 3 is SW terminal voltages when Switching Power Supply constant-current driven chip provided in an embodiment of the present invention works under discontinuous mode
The schematic diagram of waveform and output current wave；
Fig. 4 is Switching Power Supply constant-current driven chip provided in an embodiment of the present invention SW terminal voltages ripple under critical continuous conduction mode
The schematic diagram of shape and output current wave；
Fig. 5 is tangential produced by controllable silicon dimmer in Switching Power Supply constant-current driven chip provided in an embodiment of the present invention
Angle and filtered DC voltage relation schematic diagram；
Fig. 6 is in Switching Power Supply constant-current driven chip provided in an embodiment of the present invention produced by input stage current rectifying and wave filtering circuit
DC voltage and reference voltage relation schematic diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
A kind of Switching Power Supply constant-current driven chip 100 of the embodiment of the present invention, referring to Fig. 1, electric with input stage rectifying and wave-filtering
Road 200 and output-stage circuit 300 are connected, the connection controllable silicon dimmer 400 of input rectifying filter circuit 200, input rectifying filtering
Circuit 200 receives the cut voltage that controllable silicon dimmer 400 is exported, and by cut voltage commutation is into DC voltage and is filtered
Switching Power Supply driving chip 100, the driving LED load work of output-stage circuit 300 are coupled to afterwards.
Switching Power Supply driving chip 100 includes：Dimming controlling module 15, voltage sample module 11, constant-current control module 12,
Error amplifier 13, conducting duration control module 14, demagnetization control module 16, trigger U5 and switching device M2；
The input connection output-stage circuit 300 of demagnetization control module 16, the output end connection of demagnetization control module 16 is touched
Device U5 set end is sent out, demagnetization control module 16 carries out set according to the output voltage of output-stage circuit 300 to trigger U5；
The input connection input rectifying filter circuit 200 of dimming controlling module 15, the output end of dimming controlling module 15
The first input end of error amplifier 13 is connected, filtered DC voltage is converted into reference voltage by dimming controlling module 15,
And by reference voltage output to error amplifier 13；
The control end connection trigger U5 of voltage sample module 11 output end, the voltage acquisition end of voltage sample module 11
Connecting valve device M2 output end, the output end of voltage sample module 11 connects the input of constant-current control module 12, voltage
The control signal that sampling module 11 is exported according to trigger U5 gathers the voltage that switching device M2 is exported, and collection voltages are exported
To constant-current control module 12；
The control end connection trigger U5 of constant-current control module 12 output end, the output end connection of constant-current control module 12
Second input of error amplifier 13, constant-current control module 12 enters according to the trigger U5 control signals exported to collection voltages
Average voltage is exported after row current constant control to error amplifier 13；
The input of the output end connection conducting duration control module 14 of error amplifier 13, error amplifier 13 will be referred to
Voltage and average voltage are compared, and by comparative result export duration control module 14 to conducting；
The control end connection trigger U5 of duration control module 14 output end is turned on, the defeated of duration control module 14 is turned on
Go out end connection trigger U5 reset terminal, conducting duration control module 14 is believed according to comparative result and trigger the U5 control exported
Number controlling switch device M2 ON time.
Specifically, error amplifier 13 is when reference voltage is more than average voltage, export extension ON time signal to leading
Logical duration control module 14, conducting duration control module 14 extends derailing switch according to extension ON time signal by trigger U5
Part M2 ON time；Error amplifier 13 export shortening ON time signal to leading when reference voltage is less than average voltage
Logical duration control module 14, conducting duration control module 14 passes through trigger U5 shortening derailing switches according to ON time signal is shortened
Part M2 ON time；I.e. by the way that reference voltage is compared with average voltage, switching device M2 is adjusted according to comparative result
ON time, finally make reference voltage identical with average voltage by adjusting repeatedly.
For dimming controlling module 15, as shown in Fig. 2 specifically, dimming controlling module 15 includes the 6th amplifier U6, the
Seven phase inverter U7, the 6th FET Q6 and the 7th FET Q7；6th amplifier U6 in-phase input end connection the 6th
FET Q6 source electrode and the input for constituting dimming controlling module 15, the 6th amplifier U6 inverting input, the 7th
Effect pipe Q7 source electrode and the first reference voltage source V1 connect altogether, and the 6th amplifier U6 output end connects the 7th phase inverter U7's
The grid of input and the 7th FET Q7, the 7th phase inverter U7 output end connects the 6th FET Q6 grid, the
Six FET Q6 drain electrode and the 7th FET Q7 drain electrode connect and constitute the output end of dimming controlling module 15.
Wherein, filtered DC voltage is compared by dimming controlling module 15 with the first reference voltage, filtered
When DC voltage is more than the first reference voltage, the 6th FET Q6 is closed, the 7th FET Q7 conductings, exports the first benchmark
Voltage, when filtered DC voltage is less than the first reference voltage, the 6th effect Q6 should pipe conducting, the 7th FET Q7 passes
Close, output reference voltage is to error amplifier 13.
For voltage sample module 11, specifically, voltage sample module 11 includes the first FET Q1 and the first electric capacity
C1；
First FET Q1 drain electrode is the voltage acquisition end of voltage sample module 11, the first FET Q1 grid
For the control end of voltage sample module 11, the first FET Q1 source electrode connects the first electric capacity C1 first end and constitutes voltage
The output end of sampling module 11, the first electric capacity C1 the second end ground connection.
Wherein, when trigger U5 is output as high level, the first FET Q1 conductings, the first electric capacity C1 collection derailing switches
Part M2 output voltage, and the crest voltage of collection is maintained in the first electric capacity C1, when trigger U5 is output as low level,
First FET Q1 is turned off, and the first electric capacity C1 stops collection switching device M2 output voltage.
For constant-current control module 12, specifically, constant-current control module 12 includes the second FET Q2, the 3rd field-effect
Pipe Q3, first resistor R1, the second electric capacity C2 and the first phase inverter U1；
3rd FET Q3 source electrode is the input of constant-current control module 12, the 3rd FET Q3 drain electrode connection
Second FET Q2 drain electrode and first resistor R1 first end, the 3rd FET Q3 grid connect the first phase inverter U1
Output end, the second FET Q2 source ground, the second FET Q2 grid and the first phase inverter U1 input
The control end of constant-current control module 12 is connected and constitutes, first resistor R1 the second end connects the second electric capacity C2 first end and structure
Into the output end of constant-current control module 12, the second electric capacity C2 the second end is grounded.
Wherein, when trigger U5 exports high level, the second FET Q2 conductings export zero level to first resistor
R1, when trigger U5 exports low level, the 3rd FET Q3 conductings, the current period that will remain on the first electric capacity C1
Crest voltage, which is exported, gives first resistor R1, and by being exported after first resistor R1 and the second electric capacity C2 filtering to error amplifier
13。
For conducting duration control module 14, specifically, conducting duration control module 14 includes the 4th FET Q4, the
Five FET Q5, the 3rd electric capacity C3, the 4th amplifier U4 and the 3rd phase inverter U3；
4th FET Q4 source electrode connects the first reference current A1, and the 4th FET Q4 drain electrode connects the 5th
The inverting input of effect pipe Q5 drain electrode, the 3rd electric capacity C3 first end and the 4th amplifier U4, the 4th FET Q4
Grid, the 5th FET Q5 grid and the 3rd phase inverter U3 output end connection, the 3rd phase inverter U3 input
To turn on the control end of duration control module 14, the 4th amplifier U4 in-phase input end is the defeated of conducting duration control module 14
Enter end, the 4th amplifier U4 output end is the output end of conducting duration control module 14.
Wherein, when reference voltage is more than average voltage, ON time signal is shortened in the output of error amplifier 13, even if defeated
The error amplification voltage signal V gone outcompReduction, by the comparison with voltage on the 3rd electric capacity C3, to cause switching device M2's
The high level lasting time of grid voltage shortens, i.e., switching device M2 ON times shorten, and then reach that resistance Rcs is flowed through in reduction
Electric current purpose.Conversely, if reference voltage is less than average voltage, error amplifier 13 exports extension ON time signal,
Then so that the high level time extension of switching device M2 grid voltage, i.e., transistor M2 ON times increase, and then reach increasing
The purpose of the big electric current for flowing through resistance Rcs.
Demagnetization control module 16 includes the 8th amplifier U8 and the 4th electric capacity C4；
8th amplifier U8 in-phase input end connects the second reference voltage source U2, the 8th amplifier U8 inverting input
The 4th electric capacity C4 first end is connected, the 4th electric capacity C4 the second end is the output end of demagnetization control module 16.
The operation principle of the embodiment of the present invention is as follows：In switching device M2 each on-off period, n-th of switch
The peak point current I of n-th switch periods of the average value Ioutavg (n) of output current in cycle with flowing through inductance L1LP(n)
Relation as shown in formula one：
Wherein, D (n) is the dutycycle of n-th of switch periods.It is defeated in each half-sinusoid cycle behind commercial power rectification
The average value Ioutavg for going out electric current meets formula two：
Wherein, Ioutavg (1) represent output average currents of the output current Iout in first switch periods,
Ioutavg (2) represents that output average current, Ioutavgs (3) of the output current Iout in second switch periods represent output
Output average currents of the electric current Iout in the 3rd switch periods, Ioutavg (n) represents that output current Iout is opened at n-th
Output average current in the cycle of pass, T (1) represents first switch periods time, and T (2) represents second switch periods time,
T (n) represents n-th of switch periods time, and Tac represents an input half-sinusoid cycle, and has formula three：
Tac=T (1)+T (2)+...+T (n)
Formula four can be obtained with reference to formula one, formula two and formula three：
It is V to assume crest voltages of the resistance Rcs in n-th of switch periods againCS(n), then inductance L1 is all in each switch
Interim peak point current ILP(n) formula five is met：
Formula six can be obtained with reference to formula four and formula five：
Wherein, VCS(1) represent resistance Rcs two ends in the crest voltage of first switch periods, VCS(2) resistance Rcs is represented
Two ends are in the crest voltage of second switch periods, VCS(n) crest voltage of the resistance Rcs two ends in n-th of switch periods is represented.
In order to ensure that output average current Ioutavg is constant, it is only necessary to ensure in a product for inputting formula six in the half-sinusoid cycle
Score value is constant.
When transistor M2 grid is high level, then the first FET Q1 is turned on and is obtained sampling electricity from resistance Rcs
VCS is pressed, and sampled voltage VCS crest voltage is maintained in the first electric capacity C1, when transistor M2 grid is low level
When, the first FET Q1 is closed, and when transistor M2 grid is high level, the 3rd FET Q3 ends the second field-effect
Pipe Q2 is turned on, and zero level is transferred to first resistor R1 first end, when transistor M2 grid is low level, second effect
Should pipe Q2 end the 3rd FET Q3 conductings, the crest voltage of current period on the first electric capacity C1 will be kept to be transferred to first
Resistance R1 first end, after first resistor R1 and the second electric capacity C2, is sent to error amplifier 13U2 end of oppisite phase.Therefore,
In n-th of switch periods, the average voltage Vopa_avg (n) for error amplifier 13U10 end of oppisite phase-inputted is using following
Formula seven:
If Vopa_avg (n) is more than error amplifier 13U2 in-phase end+voltage, error amplifier 13U2 is exported
Error amplification voltage signal VcompReduction, to cause the high level lasting time of transistor M2 grid voltages to shorten, i.e. transistor
M2 ON times shorten, and then reach that the purpose of resistance Rcs electric current is flowed through in reduction.If conversely, Vopa_avg (n) is less than error
In-phase end+voltage of amplifier 13, then cause the high level time extension of transistor M2 grid voltages, i.e. when transistor M2 is turned on
Between increase, and then reach that the purpose of resistance Rcs electric current is flowed through in increase.After the modulation repeatedly to transistor M2 break-makes, protect
Demonstrate,prove the characteristic of error amplifier 13, the average voltage that the inverting input of error amplifier 13 is inputted and error amplifier 13
The voltage Vref that in-phase input end is inputted is equal, that is, obtains formula eight：
It can be obtained by formula seven and formula eight：
Formula ten can be obtained with reference to formula six and formula nine：
Because sampling resistor Rcs is fixed value, therefore output average current Ioutavg size is complete by error amplifier
The reference voltage Vref that 13 in-phase input end is inputted is related, is inputted by the in-phase input end of fixed error amplifier 13
Reference voltage Vref be the purpose that can reach constant current.Also through control, the voltage carries out setting controllable silicon light modulation and limit to the present invention
Maximum current processed is constant not to be fluctuated with gauze fluctuation and output voltage.
Wherein, the general principle of controllable silicon dimmer is that gauze is tangentially handled, according to tangential angle come corresponding
Change illuminator lamp brightness, and the brightness of LED is with flowing through the size of current of LED into corresponding relation, the present invention
By changing the reference voltage Vref that the in-phase input end of error amplifier is inputted, thus change flow through LED electric current it is big
It is small, and then change the purpose that the brightness of LED reaches controllable silicon light modulation.
Controllable silicon dimmer is described further below in conjunction with operation principle, details are as follows：
With reference to shown in Fig. 5 and Fig. 6, the reference voltage Vref that the in-phase input end of error amplifier 13 is inputted is with controllable silicon
Triangular angular changes and anti-phase change, i.e. triangular angular are bigger, and reference voltage Vref is lower and maximum voltage is no more than internal
Reference voltage value V1 is set.According to above-mentioned shown Vref voltages and the relation of output current, you can reach the mesh of controllable silicon light modulation
, and maximum current do not fluctuate with the fluctuation of gauze and output voltage, improves the constant current accuracy and reliability of system.
Fig. 3 shows SW terminal voltages waveform and inductive current ripple when traditional LED drive circuit works under discontinuous mode
Shape, when switching device M2 is opened, SW terminal voltages are zero, and switching device M2 shut-off SW terminal voltages at initial stage are VDD, when output electricity
After stream drops to zero, the waveform is vibrated centered on VDD.Fig. 4 shows the LED drive circuit according to the present invention in critical continuous mode
SW terminal voltages waveform and inductive current waveform when being worked under pattern, as seen from Figure 4, when inductive current zero passage, SW ends electricity
Pressure begins to decline vibration, reopens switching device M2 by demagnetization control module so that inductive current approximate critical is continuous.
A kind of another controllable silicon light modulation LED drive circuit of embodiment of the present invention, including controllable silicon dimmer, input stage are whole
Filter circuit and output-stage circuit are flowed, controllable silicon light modulation LED drive circuit also includes above-mentioned Switching Power Supply driving chip.
Specifically, output-stage circuit includes transistor M1, inductance L1, the first diode D1, the second diode D2, the 7th electricity
Solve electric capacity C7 and the 5th resistance R5；
Inductance L1 first end connects the 7th electrochemical capacitor C7 first end and the 5th resistance R5 first end, inductance L1's
Second end connection transistor M1 drain electrode, transistor M1 source electrode connects the leakage of the second diode D2 anode and transistor M2
Pole, the negative electrode connection input stage current rectifying and wave filtering circuit of inductance L1 first end, transistor M1 grid and the second diode D2.
The embodiment of the present invention provides switch power source driving circuit and controllable silicon light modulation LED drive circuit, passes through thyristor regulating
Light device is tangentially handled gauze, according to tangential angle come the corresponding brightness for changing illuminator lamp, by changing error
The reference voltage that the in-phase input end of amplifier is inputted, so as to change the size of current for flowing through LED, and then changes LED
Brightness reach the purpose of controllable silicon light modulation, maximum output current is not fluctuated with gauze and output voltage, and dimming scope is strong,
Cost performance is high.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Some equivalent substitutes or obvious modification are made on the premise of not departing from present inventive concept, and performance or purposes are identical, all should
It is considered as belonging to the scope of patent protection that the present invention is determined by the claims submitted.
Claims (8)
1. a kind of Switching Power Supply driving chip, it is connected with input stage current rectifying and wave filtering circuit and output-stage circuit, and the input is whole
Filter circuit connection controllable silicon dimmer is flowed, the input rectifying filter circuit receives the cut of the controllable silicon dimmer output
Voltage, and it is coupled to the Switching Power Supply driving chip, institute by the cut voltage commutation into DC voltage and after being filtered
State output-stage circuit driving LED load work；Characterized in that, the Switching Power Supply driving chip includes：Dimming controlling module,
Voltage sample module, constant-current control module, error amplifier, conducting duration control module, demagnetization control module, trigger and
Switching device；
The input of the demagnetization control module connects the output-stage circuit, the output end connection institute of the demagnetization control module
The set end of trigger is stated, the demagnetization control module is carried out according to the output voltage of the output-stage circuit to the trigger
Set；
The input of the dimming controlling module connects the input rectifying filter circuit, the output end of the dimming controlling module
The first input end of the error amplifier is connected, filtered DC voltage is converted into reference to electricity by the dimming controlling module
Pressure, and give the error amplifier by the reference voltage output；
The control end of the voltage sample module connects the output end of the trigger, the voltage acquisition of the voltage sample module
The output end of the end connection switching device, the output end of the voltage sample module connects the input of the constant-current control module
End, the control signal that the voltage sample module is exported according to the trigger gathers the voltage that the switching device is exported, and
Collection voltages are exported to the constant-current control module；
The control end of the constant-current control module connects the output end of the trigger, and the output end of the constant-current control module connects
The second input of the error amplifier is connect, the control signal that the constant-current control module is exported according to the trigger is to institute
State collection voltages and exported after current constant control average voltage to the error amplifier；
The input of the output end connection conducting duration control module of the error amplifier, the error amplifier is by institute
State reference voltage and the average voltage is compared, and comparative result is exported to the conducting duration control module；
The control end of the conducting duration control module connects the output end of the trigger, the conducting duration control module
Output end connects the reset terminal of the trigger, and the conducting duration control module is according to the comparative result and the trigger
The control signal of output controls the ON time of the switching device.
2. Switching Power Supply driving chip as claimed in claim 1, it is characterised in that the error amplifier is described with reference to electricity
When pressure is more than the average voltage, extension ON time signal is exported to the conducting duration control module, the conducting duration
Control module extends the ON time of the switching device according to the extension ON time signal by the trigger；
The error amplifier exports shortening ON time signal to described when the reference voltage is less than the average voltage
Duration control module is turned on, the conducting duration control module is contracted according to the shortening ON time signal by the trigger
The ON time of the short switching device.
3. Switching Power Supply driving chip as claimed in claim 1 or 2, it is characterised in that the constant-current control module includes the
Two FETs, the 3rd FET, first resistor, the second electric capacity and the first phase inverter；
The source electrode of 3rd FET is the input of the constant-current control module, and the drain electrode of the 3rd FET connects
Drain electrode and the first end of the first resistor of second FET are connect, the grid connection of the 3rd FET is described
The output end of first phase inverter, the source ground of second FET, the grid of second FET and described
The input of one phase inverter connects and constitutes the control end of the constant-current control module, the second end connection institute of the first resistor
State the first end of the second electric capacity and constitute the output end of the constant-current control module, the second end ground connection of second electric capacity.
4. Switching Power Supply driving chip as claimed in claim 1 or 2, it is characterised in that the conducting duration control module bag
Include the 4th FET, the 5th FET, the 3rd electric capacity, the 4th amplifier and the 3rd phase inverter；
The source electrode of 4th FET connects the first reference current, the drain electrode connection the described 5th of the 4th FET
The inverting input of the draining of FET, the first end of the 3rd electric capacity and the 4th amplifier, described 4th
The output end connection of the grid of effect pipe, the grid of the 5th FET and the 3rd phase inverter, the described 3rd is anti-
The input of phase device is the control end of the conducting duration control module, and the in-phase input end of the 4th amplifier is described leads
The input of logical duration control module, the output end of the 4th amplifier is the output end for turning on duration control module.
5. Switching Power Supply driving chip as claimed in claim 1 or 2, it is characterised in that the dimming controlling module includes the
Six amplifiers, the 7th phase inverter, the 6th FET and the 7th FET；
The in-phase input end of 6th amplifier connects the source electrode of the 6th FET and constitutes the brightness adjustment control mould
The input of block, inverting input, the source electrode and the first reference voltage of the 7th FET of the 6th amplifier
Source connects altogether, and the output end of the 6th amplifier connects the input of the 7th phase inverter and the grid of the 7th FET
Pole, the output end of the 7th phase inverter connects the grid of the 6th FET, the drain electrode of the 6th FET and
The drain electrode of 7th FET connects and constitutes the output end of the dimming controlling module.
6. Switching Power Supply driving chip as claimed in claim 1 or 2, it is characterised in that the voltage sample module includes the
One FET and the first electric capacity；
The drain electrode of first FET is the voltage acquisition end of the voltage sample module, the grid of first FET
The control end of extremely described voltage sample module, the source electrode of first FET connects the first end of first electric capacity simultaneously
Constitute the output end of the voltage sample module, the second end ground connection of first electric capacity.
7. Switching Power Supply driving chip as claimed in claim 1 or 2, it is characterised in that the demagnetization control module includes the
Eight amplifiers and the 4th electric capacity；
The in-phase input end of 8th amplifier connects the second reference voltage source, and the inverting input of the 8th amplifier connects
The first end of the 4th electric capacity is connect, the second end of the 4th electric capacity is the output end of the demagnetization control module.
8. a kind of controllable silicon light modulation LED drive circuit, including controllable silicon dimmer, input stage current rectifying and wave filtering circuit and output stage
Circuit, it is characterised in that the controllable silicon light modulation LED drive circuit also includes the switch as described in any one of claim 1 to 7
Power drives chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610244501.3A CN105792433B (en) | 2016-04-19 | 2016-04-19 | Switching Power Supply driving chip and controllable silicon light modulation LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610244501.3A CN105792433B (en) | 2016-04-19 | 2016-04-19 | Switching Power Supply driving chip and controllable silicon light modulation LED drive circuit |
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| CN105792433B true CN105792433B (en) | 2017-08-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106507533B (en) * | 2016-10-19 | 2019-05-03 | 芜湖鑫芯微电子有限公司 | A kind of non-isolated non-pole light regulating LED chip |
| CN110677043B (en) * | 2019-09-12 | 2021-05-28 | 无锡江南计算技术研究所 | Multiphase DCDC power supply control circuit with self-adaptive output voltage adjustment function |
| CN112738951B (en) * | 2021-01-05 | 2022-01-25 | 陕西亚成微电子股份有限公司 | LED control method and circuit |
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| CN102202449A (en) * | 2011-06-30 | 2011-09-28 | 杭州士兰微电子股份有限公司 | LED driving control circuit and method |
| CN202121839U (en) * | 2011-06-20 | 2012-01-18 | 上海新进半导体制造有限公司 | Reload decision circuit of switch power supply |
| CN102685984A (en) * | 2012-04-10 | 2012-09-19 | 苏州聚元微电子有限公司 | LED (Light Emitting Diode) constant-current driving circuit |
| EP2887767A1 (en) * | 2013-12-17 | 2015-06-24 | Nxp B.V. | Switching power supply controller |
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| JP5629191B2 (en) * | 2010-05-28 | 2014-11-19 | ルネサスエレクトロニクス株式会社 | Power supply |
| CN103781229B (en) * | 2012-10-25 | 2015-09-23 | 上海占空比电子科技有限公司 | A kind of light adjusting circuit of compatible silicon controlled dimmer and control method |
| US9337725B2 (en) * | 2013-07-22 | 2016-05-10 | Microchip Technology Inc. | Output current control in a boundary conduction mode buck converter |
| CN103415128B (en) * | 2013-09-02 | 2015-04-22 | 陈畅 | Circuit for realizing controllable silicon dimming and high-power factor |
| JP6678289B2 (en) * | 2014-03-17 | 2020-04-08 | パナソニックＩｐマネジメント株式会社 | Semiconductor light source driving device and projection type video display device |
| CN103929855B (en) * | 2014-04-02 | 2017-01-25 | 深圳市明微电子股份有限公司 | LED lighting device, LED driving circuit and switch power source driving chip of LED driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202121839U (en) * | 2011-06-20 | 2012-01-18 | 上海新进半导体制造有限公司 | Reload decision circuit of switch power supply |
| CN102202449A (en) * | 2011-06-30 | 2011-09-28 | 杭州士兰微电子股份有限公司 | LED driving control circuit and method |
| CN102685984A (en) * | 2012-04-10 | 2012-09-19 | 苏州聚元微电子有限公司 | LED (Light Emitting Diode) constant-current driving circuit |
| EP2887767A1 (en) * | 2013-12-17 | 2015-06-24 | Nxp B.V. | Switching power supply controller |
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