CN104124862B - High PFC constant-current control devices and voltage changer without loop compensation - Google Patents
High PFC constant-current control devices and voltage changer without loop compensation Download PDFInfo
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- CN104124862B CN104124862B CN201310154927.6A CN201310154927A CN104124862B CN 104124862 B CN104124862 B CN 104124862B CN 201310154927 A CN201310154927 A CN 201310154927A CN 104124862 B CN104124862 B CN 104124862B
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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
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Abstract
The present invention discloses a kind of high PFC constant-current control devices and voltage changer without loop compensation, the device includes automatic gain controller, input is the AC-input voltage sampled signal of original edge voltage sampling network, and output end output is with input voltage with frequently with the signal of phase but constant amplitude；Peak value comparison method comparator, there is positive and negative input and output end, negative input end is connected with the output end of automatic gain controller, and positive input terminal is connected with the anode of primary current inductive reactance;Clock-signal generator, input are the DC voltage sampled signal of auxiliary winding voltage sampling network, and output end exports the frequency clock signal directly proportional to direct current sampled voltage；Trigger, for receiving the comparison signal of clock signal and Peak current control comparator output, and being switched on or off for power switch pipe is controlled with comparison signal based on clock signal.The present invention is without light requirement even summation loop compensation, you can realizes high PFC and output constant current control.
Description
Technical field
The present invention relates to switch power technology field, more specifically to a kind of high PFC constant currents without loop compensation
Control device, it can be applied to isolated form inverse excitation type converter, non-isolated buck-boost converter and non-isolated drop simultaneously
Buckling parallel operation.
Background technology
LED light characteristic is generally all described as the function of electric current, rather than the function of voltage, LED forward voltages it is small
Change can cause larger LED current to change, so as to cause the large change of electric current.So it can not be protected using drive of constant voltage source
The uniformity of LED luminance is demonstrate,proved, and influences LED reliability, life-span and light decay.Therefore, LED is generally driven using constant-current source
It is dynamic.
For the purpose of safety, many LED lamps, which are required to LED driver, has isolation features, that is, realize output with
The electrical isolation of power network input；In the application of middle low power (being less than 150W), inverse excitation type converter is most widely used
Isolated converter, most general feedback system is that output is sampled come feedback control by optocoupler at present.But due to optocoupler
Problem of aging be present, therefore the stability of circuit can be influenceed, while also weaken the intensity of electrical isolation.
On the other hand, the extensive use of power electronics causes seriously to pollute to public electric wire net, and reactive power is increasingly subject to weight
Depending on.In order to mitigate the extent of injury of electric pollution, many countries formulate corresponding standard one after another, when power exceed certain value (>
5W), it is necessary to meet High Power Factor (PF>0.9).Therefore the LED driver of relatively high power needs to use PFC
(Power Factor Correction, abbreviation PFC) technology, to reach high PFC.Wherein, high PFC alleged in this application,
Refer to power factor more than 0.9.
At present, the control mode of market is almost all based on the loop control mode of traditional switch power supply, in different framves
The characteristics of change of some algorithms is carried out under structure, but has one jointly is exactly to need loop compensation to can be only achieved system stabilization,
And different application scenarios is directed to, such as different power, it is necessary to different loop compensation, this gives different peripheral frameworks
Using bringing inconvenience.As shown in figure 1, its schematic diagram for inverse-excitation type PFC constant-current control devices in the prior art, the PFC are permanent
The core of flow control device is a constant current pfc controller, and the constant current pfc controller is arranged in the drive circuit of LED load,
So as to play a part of high PFC and current constant control.
The drive circuit has rectification module, input capacitance Ci n, original edge voltage sampling network R1, R2, transformer T, work(
Rate switching tube Q1, primary current inductive reactance R0, secondary commutation diode D1, output capacitance Cout, output LED load L, auxiliary
Winding side commutation diode D2, auxiliary winding voltage sampling network R3, R4；One is provided with the constant current pfc controller individually
Compensation pin, an external compensating electric capacity Ccomp can be used for, it is necessary to adjust this compensation under different application conditions
Electric capacity Ccomp capacitance reaches the stability of system；Certainly Separate designs also do not need ring by cleverly control mode
Road compensation, but because its specific control mode makes the reduction of its versatility.
In addition to the difference of loop compensation, also single-stage and two-stage both modes reach high PFC perseverance on the market
Streaming system, two-step evolution mode design relatively simple but less efficient；Single-stage control mode design it is complex, but efficiency compared with
It is high.
Therefore, a kind of high PFC current constant control modes of the general inverse-excitation type single-stage without loop compensation are studied, not only in skill
It is challenging work in art, while there is high integration, low cost, high efficiency, versatile realistic meaning.
The content of the invention
It is an object of the invention to provide a kind of high PFC constant-current control devices without loop compensation, its feedback element base
In the form of big signal, the small-signal closed circuit of traditional form is eliminated, and then is not needing loop compensation and related ring
Under the stable debugging in road, you can realize automatic stabilisation.
In order to reach above-mentioned purpose, solution of the invention is：
A kind of high PFC constant-current control devices without loop compensation, wherein, including：
Automatic gain controller, input be original edge voltage sampling network AC-input voltage sampled signal, output end
Then export a signal with input voltage with frequency with phase but constant amplitude；
Peak value comparison method comparator, has positive input terminal, negative input end and output end, and the negative input end increases with automatic
The output end of beneficial controller is connected, and positive input terminal is connected with the anode of primary current inductive reactance；
Clock-signal generator, input be auxiliary winding voltage sampling network DC voltage sampled signal, output end
Then export the frequency clock signal directly proportional to direct current sampled voltage；
When trigger, the comparison signal of comparator output is controlled for receiving clock signal and Peak current, and is based on
Clock signal controls being switched on or off for power switch pipe with comparison signal.
Further, the automatic gain controller have the first operational amplifier, fixed resistance, variable resistor, counter with
And first comparator, the positive input terminal of first operational amplifier are connected with original edge voltage sampling network, first operation amplifier
The negative input end of device is connected with power supply by fixed resistance, and the negative input end of first operational amplifier is also by can power transformation
Hinder and be connected with the output end of the first operational amplifier, the output of the negative input end of the first comparator and the first operational amplifier
End is connected, and the positive input terminal of the first comparator is connected with the first normal voltage, the output end and counter of the first comparator
Input be connected, the output end of the counter is then connected with variable resistor to adjust the size of variable resistor.
Further, the clock-signal generator has the second operational amplifier, the second comparator, the first metal-oxide-semiconductor, second
Metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the first electric capacity and the 7th resistance, the positive input terminal of second operational amplifier with it is auxiliary
Winding voltage sampling network is helped to be connected, the output end of second operational amplifier is connected with the grid of the first metal-oxide-semiconductor, and this first
Metal-oxide-semiconductor is also connected with the negative input end of the second operational amplifier and the 7th resistance, and the 7th resistance other end is then with power supply
It is connected, second metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor composition 1:1 mirror current source, the output end of second comparator is clock end,
The grid of 4th metal-oxide-semiconductor is connected with the output end of the second comparator, and source electrode is connected with the positive input terminal of the second comparator, drain electrode
It is connected with power supply；The drain electrode of 3rd metal-oxide-semiconductor is connected with power supply by the first electric capacity, the negative input of second comparator
End is connected with the second normal voltage.
Further, the trigger is rest-set flip-flop, has R ends, S ends and Q ends, the S ends and clock-signal generator
Output end be connected, R ends are connected with the output end of peak value comparison method comparator, and Q ends then control with the grid of power switch pipe
End is connected to control the unlatching of power switch pipe to turn off.
The present invention also provides a kind of voltage changer, and it includes the high PFC current constant controls dress according to foregoing any one
Put, and
Rectification module, rectification is carried out for receiving AC-input voltage, and to the AC-input voltage；
Original edge voltage sampling network, for being sampled to the AC-input voltage of rectification module institute rectification, with life
Into the AC-input voltage sampled signal；
Voltage transformation module, it is used to receive by the AC-input voltage of rectification module institute rectification, and and power
Switching tube and primary current inductive reactance are connected in series, the voltage transformation module under the control of the power switch pipe to
Load provides output voltage.
Further, the voltage transformation module is inverse-excitation type conversion module, and it includes transformer, output diode and defeated
Go out electric capacity.Transformer primary side anode is connected with bus VI N, and its negative terminal is connected with the drain of power tube；Transformer secondary is just
End is connected with LED negative terminals and output capacitance negative terminal, and its negative terminal is connected with output diode anode, output capacitance anode and output two
Pole pipe negative electrode is connected；Transformer secondary side anode is connected with primary side the earth, its negative terminal and secondary side output diode anode phase
Even.
Further, the voltage transformation module is step-down/up type conversion module, and it includes transformer, and fly-wheel diode is auxiliary
Help diode and output capacitance.Transformer primary side anode is connected with bus VI N and output capacitance negative terminal, its negative terminal and work(
Rate pipe drains and fly-wheel diode anode is connected, and output capacitance anode is connected with fly-wheel diode negative electrode；Transformer secondary side is just
End is connected with the earth, and its negative terminal is connected with booster diode.
After said structure, the present invention relates to a kind of high PFC constant-current control devices without loop compensation, it is by allowing
Automatic gain controller export one with input voltage with frequency with mutually but constant amplitude signal, so ensure that voltage signal with
There can be same phase between current signal, and then ensure that High Power Factor；Simultaneously by setting peak value comparison method to compare
Device, rest-set flip-flop and clock-signal generator, and allow clock-signal generator to export a frequency and direct current sampled voltage
Directly proportional clock signal, it can so form a constant-current source.
Compared with prior art, advantage of the invention is that：The present invention is without light requirement even summation loop compensation, you can realizes simultaneously
High PFC and output constant current control, and system is stable；Simultaneously because the present invention uses single-stage control mode, reduce peripheral member
Device, cost and space are saved, reached the purpose of miniaturization；In addition, the principle of invention is versatile, it is applicable not only to anti-
Excitation type converter, it could be applicable to buck-boost converter and buck converter.
Brief description of the drawings
Fig. 1 is the schematic diagram of inverse-excitation type PFC constant-current control devices of the prior art；
Fig. 2 is the circuit diagram of the high PFC constant-current control devices of inverse-excitation type of one embodiment of the invention；
Fig. 3 is the circuit diagram of automatic gain controller specific embodiment in Fig. 2；
Fig. 4 is the circuit diagram of clock-signal generator specific embodiment in Fig. 2；
Fig. 5 for described based on control mode of the present invention AC-input voltage, power switch pipe control signal, primary side
The schematic diagram of electric current and secondary side current waveform；
Fig. 6 is the circuit diagram that the present invention is applied to non-isolated buck-boost converter.
In figure：
The bridge rectifier module 1 of inverse excitation type converter 100
The high automatic gain controller 21 of PFC constant-current control devices 2
The peak value comparison method comparator 22 of counter 211
The rest-set flip-flop 24 of clock-signal generator 23
Embodiment
In order to which technical scheme is explained further, the present invention is explained in detail below by specific embodiment
State.
As shown in Fig. 2 it is applied anti-for the present invention relates to a kind of high PFC constant-current control devices 2 without loop compensation
Schematic diagram in excitation type converter 100, the inverse excitation type converter 100 include bridge rectifier module 1, input capacitance Cin, transformer
T, power switch pipe Q1, primary current inductive reactance R0, original edge voltage sampling resistor network R1, R2, secondary commutation diode D1,
Output capacitance Cout, output LED load, assists winding side commutation diode D2, auxiliary winding voltage sampling network R3, R4,
Caux。
High PFC constant-current control devices 2 of the present invention without loop compensation, including automatic gain controller 21, peak
It is worth current control comparator 22, clock-signal generator 23 and rest-set flip-flop 24.
The input of the automatic gain controller 21 is the AC-input voltage sampled signal of original edge voltage sampling network,
In the present embodiment, the automatic gain controller 21 is connected with original edge voltage sampling network, and the voltage of its tie point isWherein ω isVINScope beAssuming that R1, R2 are set
A suitable ratio is scheduled on, Vsine is met following formula：VSINE=VSSin ω t, wherein VSScope be<0.5V~1.56V>.
The output end of the automatic gain controller 21 then exports a letter with input voltage with frequency with phase but constant amplitude
Number；As shown in figure 3, it is a kind of embodiment of the automatic gain controller 21, the automatic gain controller 21 has
First operational amplifier OP1, fixed resistance R5, variable resistor R6, counter 211 and first comparator CMP1, first fortune
The positive input terminal for calculating amplifier OP1 is connected with original edge voltage sampling network, and its input signal is Vsine, first operation amplifier
Device OP1 negative input end is connected with power supply by fixed resistance R5, and first operational amplifier OP1 negative input end is also logical
Cross variable resistor R6 and be connected with the first operational amplifier OP1 output end, first comparator CMP1 negative input end and
One operational amplifier OP1 output end is connected, first comparator CMP1 positive input terminal and the first normal voltage Vref1 phases
Even, first comparator CMP1 output end is connected with the input of counter 211, the output end of the counter 211 then with can
Become resistance R6 to be connected to adjust variable resistor R6 size, first operational amplifier OP1 output end is automatic gain control
The output end of device 21 processed, its output voltage are Vs_out.
From " empty short empty disconnected " characteristic of the first operational amplifier：
In the present embodiment, variable resistor R6 is a N+1 position digital signals d0d1…dNThe variable resistor of control, when<
d0d1…dN>=0 it is minimum when, R6=0；When<d0d1…dN>=<11…1>When maximum, R6 is maximum.In the starting stage, R6 zero,
Gain (R5+R6)/R6 is minimum, is unit 1.Then V is constantly compared by first comparator CMP1S_OUTPeak value and VREF1,
A control signal is exported, the working condition of control counter 211, when first comparator CMP1 output signal is high, is counted
Number device 211 result that constantly increase counts；When there is low level in first comparator CMP1 output signal, counter 211
Stop counting and keep count results at that time.So, by constantly adjusting<d0d1…dN>Value, and constantly adjust
R6, and then constantly adjust gain (R5+R6)/R6, make final VS_OUTPeak value be equal to VREF1Just reach stable, obtain
VS_OUT=VREF1sinωt；So far, the negative input end of peak value comparison method comparator 22 will obtain one and input
Sinusoidal voltage is with the same phase of frequency, and it is V that peak value is constantREF1Signal.
When power switch pipe Q1 is opened, constantly being risen by the inductive current of primary side, node voltage constantly raises, when
Reach VS_OUT=VREFDuring sin ω t certain point, peak value comparison method comparator 22 is overturn, and the R ends of rest-set flip-flop 24 are from ' 0 '
Switch to ' 1 ', Q ends output ' 0 ', switch-off power switching tube Q1.
The peak value comparison method comparator 22 has positive input terminal, negative input end and an output end, the negative input end with from
The output end of dynamic gain controller 21 is connected, and positive input terminal is connected with the anode of primary current inductive reactance.
The input of the clock-signal generator 23 is the DC voltage sampled signal of auxiliary winding voltage sampling network, should
The output end of clock-signal generator 23 then exports a frequency clock signal directly proportional to direct current sampled voltage；Such as Fig. 4 institutes
Show, it is a kind of specific embodiment of the clock-signal generator 23, and the clock-signal generator 23 has the second operation amplifier
Device OP2, the second comparator CMP2, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the first electric capacity
C1 and the 7th resistance R7, second operational amplifier OP2 positive input terminal are connected with auxiliary winding voltage sampling network, that is, obtained
FB signals, second operational amplifier OP2 output end is connected with the first metal-oxide-semiconductor M1 grid, first metal-oxide-semiconductor M1 also with
Second operational amplifier OP2 negative input end and the 7th resistance R7 is connected, the 7th resistance R7 other ends then phase with power supply
Even, the second metal-oxide-semiconductor M2 and the 3rd metal-oxide-semiconductor M3 compositions 1:1 mirror current source, when second comparator CMP2 output end is
Clock end C l ock, the 4th metal-oxide-semiconductor M4 grid are connected with the second comparator CMP2 output end, source electrode and the second comparator
CMP2 positive input terminal is connected, and drain electrode is connected with power supply；3rd metal-oxide-semiconductor M3 drain electrode by the first electric capacity C1 and with power supply
Ground is connected, and second comparator CMP2 negative input end is connected with the second normal voltage Vref2.
As shown in Fig. 2 partial pressure of the FB signals from assists windingWherein VAUXIt is secondary
Side winding reflexes to the voltage of assists windingWherein NS,NAUXIt is vice-side winding respectively and auxiliary
The coil number of winding is helped, because VD1,VD2Very little, it can be ignored, so comprehensive 2 formula above, can be obtained：
Referring to shown in Fig. 4, the second operational amplifier OP2 is adjusted the 7th resistance R7 upper end by negative-feedback
To equal with FB, then i.e.Further according to basic charge balance formula C*U=I*t, CLK frequency can be obtained
For：
Wherein,
The clock signal clk is connected to the S ends of rest-set flip-flop 24, and when the high level of the CLK signal arrives, Q ends switch to from ' 0 '
' 1 ', open power tube Q1.
The rest-set flip-flop 24 has R ends, S ends and Q ends, and the S ends are connected with the output end of clock-signal generator 23, R
End is connected with the output end of peak value comparison method comparator 22, and Q ends are then connected with the grid control terminal of power switch pipe to control
The unlatching shut-off of power switch pipe.It is appreciated that according to the difference of concrete application, rest-set flip-flop 24 can also alternatively use it
The trigger of his type, such as JK flip-flop
For rest-set flip-flop 24, its State Transferring is as follows：
S=1, R=0, Q=1, by rising edge, power switch pipe Q1 is opened clk cycle；
S=0, R=0, Q=1, CLK switch to low level by high level, but system remains in that power switch pipe Q1 is opened；
S=0, R=1, Q=0, CLK remain in that low level, and comparator 212 exports switchs to high level, power by low level
Switching tube Q1 is closed；
S=0, R=0, Q=0, CLK remain in that low level, and the output of comparator 212 is returned to low level, power switch
Pipe Q1 is remained turned-off；
S=1, R=0, Q=1, repeat above procedure and circulate.
According to above operation principle, Fig. 5 system work wave can be depicted；In addition, being based on above-mentioned statement, can push away
The export present invention has the advantages that：
First：Primary side current waveform is exactly input current, and it is presented sine and covers form, with inlet highway voltage waveform
With the same phase of frequency, high PFC requirement is reached with this, the peak point current at wherein any point meets following condition：
Wherein N represents a civil power cycle TCivil powerThe system duty cycle T's inside included
Number, n are 1 to the natural number between N.
Second：Output current is in constant current state：
Input power Pin is equivalent to a complete sinusoidal cycle TCivil powerInterior input energy:
Wherein Lp is the equivalent inductance of transformer T primary sides, and f is system operating frequency, ipk(max)For a sinusoidal cycles
The current maxima that interior primary side flows through, is equal to
Input power can be obtained by the conservation of energy and be equal to power output Pin=Pout；
It can obtain:
Bring frequency f expression formula into above formula again, can obtain
Wherein Lp, R0, R7, C1, R3, R4, NAUX, Ns is the preset parameter of peripheral cell, is a fixed value；Wherein,
VREF1, VREF2, C1 is the parameter of internal circuit control, and C1 is preset parameter, is certain value；Obtain similar VREF1, VREF2It is so permanent
Fixed reference voltage.
So it can be seen that the expression formula of output current is certain value, that is, the effect of constant current is reached, has passed through constant current above
Expression formula is pushed over, it can be seen that current constant mode of the invention does not simultaneously need light even or any type of loop stability is mended
Repay, so as to without light requirement even summation loop compensation, you can while realize the effect of high PFC and output constant current are controlled.
3rd：The control mode of the present invention is simple and clear, and versatility is very strong, is applicable not only to inverse excitation type converter 100,
It is equally applicable to buck-boost converter.Fig. 6 i.e. show it is according to embodiments of the present invention by the control device be applied to it is non-isolated
Buck-boost converter circuit diagram.
Specifically it refer to shown in Fig. 6, it also includes automatic gain controller 21, peak value comparison method comparator 22, clock
Signal generator 23 and rest-set flip-flop 24.
It is exactly that input power can be with fully equivalent that buck-boost converter has a maximum identical point with inverse excitation type converter
Primary side inductance energy synthesis when being opened for power tube, under the conditions of inductive current is discontinuous, input power still meets
Following expression：
Input power can be obtained by the conservation of energy and be equal to power output Pin=Pout；
It can obtain:
Frequency f expression formula is changed into simultaneously：
F is brought into Iout expression formula can obtain following expression
Wherein Lp, R0, R7, C1, R3, R4 are the preset parameters of peripheral cell, are a fixed value；Wherein, VREF1, VREF2,
C1 is the parameter of internal circuit control, and C1 is preset parameter, is certain value；Obtain similar VREF1, VREF2So constant benchmark electricity
Pressure.So it can be seen that the expression formula of output current is certain value, that is, the effect of constant current is reached.
In summary, the present invention relates to a kind of high PFC constant-current control devices 2 without loop compensation, it is automatic by allowing
Gain controller 21 exports a signal with input voltage with frequency with phase but constant amplitude, so ensure that voltage signal and electricity
There can be same phase between stream signal, and then ensure that High Power Factor；Simultaneously by setting peak value comparison method comparator
22nd, rest-set flip-flop 24 and clock-signal generator 23, and allow clock-signal generator 23 to export a frequency and adopted with direct current
The directly proportional clock signal of sample voltage, can so form a constant-current source.
Compared with prior art, advantage of the invention is that：The present invention is without light requirement even summation loop compensation, you can realizes simultaneously
High PFC and output constant current control, and system is stable；Simultaneously because the present invention uses single-stage control mode, reduce peripheral member
Device, cost and space are saved, reached the purpose of miniaturization；In addition, the principle of invention is versatile, it is applicable not only to anti-
Excitation type converter, it could be applicable to buck-boost converter.It will be understood by those skilled in the art that the constant-current control device of the present invention
Other kinds of voltage changer, such as buck converter can also be applied to.
Above-described embodiment and schema and non-limiting product form of the invention and style, any art it is common
The appropriate change or modification that technical staff is done to it, it all should be regarded as not departing from the patent category of the present invention.
Claims (6)
- A kind of 1. high PFC constant-current control devices without loop compensation, it is characterised in that including：Automatic gain controller, input are the AC-input voltage sampled signal of original edge voltage sampling network, and output end is then defeated Go out a signal with input voltage with frequency with phase but constant amplitude；Peak value comparison method comparator, there is positive input terminal, negative input end and output end, the negative input end and automatic gain control The output end of device processed is connected, and positive input terminal is connected with the anode of primary current inductive reactance；Clock-signal generator, input are the DC voltage sampled signal of auxiliary winding voltage sampling network, and output end is then defeated Go out a frequency clock signal directly proportional to direct current sampled voltage；Trigger, believe for receiving the comparison signal of clock signal and the output of peak value comparison method comparator, and based on clock Being switched on or off for power switch pipe is controlled number with comparison signal；The automatic gain controller compares with the first operational amplifier, fixed resistance, variable resistor, counter and first Device, the positive input terminal of first operational amplifier are connected with original edge voltage sampling network, the negative input of first operational amplifier End is connected with power supply by fixed resistance, and the negative input end of first operational amplifier is also by variable resistor and with first The output end of operational amplifier is connected, and the negative input end of the first comparator is connected with the output end of the first operational amplifier, should The positive input terminal of first comparator is connected with the first normal voltage, the output end of the first comparator and the input phase of counter Even, the output end of the counter is then connected with variable resistor to adjust the size of variable resistor.
- 2. the high PFC constant-current control devices without loop compensation as claimed in claim 1, it is characterised in that the clock signal Generator have the second operational amplifier, the second comparator, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, First electric capacity and the 7th resistance, the positive input terminal of second operational amplifier are connected with auxiliary winding voltage sampling network, should The output end of second operational amplifier is connected with the grid of the first metal-oxide-semiconductor, and first metal-oxide-semiconductor is also negative with the second operational amplifier Input and the 7th resistance are connected, and the 7th resistance other end is then connected with power supply, second metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor Composition 1:1 mirror current source, the output end of second comparator is clock end, and the grid of the 4th metal-oxide-semiconductor is compared with second The output end of device is connected, and source electrode is connected with the positive input terminal of the second comparator, and drain electrode is connected with power supply；3rd metal-oxide-semiconductor Drain electrode is connected with power supply by the first electric capacity, and the negative input end of second comparator is connected with the second normal voltage.
- 3. the high PFC constant-current control devices without loop compensation as claimed in claim 1, it is characterised in that the trigger For rest-set flip-flop, there is R ends, S ends and Q ends, the S ends are connected with the output end of clock-signal generator, R ends and peak point current The output end of control comparator is connected, and Q ends are then connected with the grid control terminal of power switch pipe to control opening for power switch pipe Open shut-off.
- 4. a kind of voltage changer, including the high PFC constant-current control devices according to any one of claim 1-3, andRectification module, rectification is carried out for receiving AC-input voltage, and to the AC-input voltage；Original edge voltage sampling network, for being sampled to the AC-input voltage of rectification module institute rectification, to generate State AC-input voltage sampled signal；Voltage transformation module, it is used to receive by the AC-input voltage of rectification module institute rectification, and and power switch Pipe and primary current inductive reactance are connected in series, and the voltage transformation module is under the control of the power switch pipe to load Output voltage is provided.
- 5. voltage changer according to claim 4, it is characterised in that the voltage transformation module is that inverse-excitation type becomes mold changing Block, it includes transformer, output diode and output capacitance, wherein, transformer primary side anode is connected with bus, its negative terminal It is connected with the drain electrode of power switch pipe；Transformer secondary anode is connected with LED negative terminals and output capacitance negative terminal, its negative terminal with it is defeated Go out diode anode to be connected, output capacitance anode is connected with output diode negative electrode；Transformer secondary side anode and primary side are big Ground is connected, and its negative terminal is connected with secondary side output diode anode.
- 6. voltage changer according to claim 4, it is characterised in that the voltage transformation module is step-down/up type conversion Module, it includes transformer, fly-wheel diode, booster diode and output capacitance, wherein, transformer primary side anode and mother Line and output capacitance negative terminal are connected, and its negative terminal is drained with power switch pipe and fly-wheel diode anode is connected, output capacitance anode It is connected with fly-wheel diode negative electrode；Transformer secondary side anode is connected with the earth, and its negative terminal is connected with booster diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310154927.6A CN104124862B (en) | 2013-04-28 | 2013-04-28 | High PFC constant-current control devices and voltage changer without loop compensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310154927.6A CN104124862B (en) | 2013-04-28 | 2013-04-28 | High PFC constant-current control devices and voltage changer without loop compensation |
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| Publication Number | Publication Date |
|---|---|
| CN104124862A CN104124862A (en) | 2014-10-29 |
| CN104124862B true CN104124862B (en) | 2018-03-16 |
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| CN201310154927.6A Active CN104124862B (en) | 2013-04-28 | 2013-04-28 | High PFC constant-current control devices and voltage changer without loop compensation |
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| CN107357348B (en) * | 2017-07-19 | 2018-09-18 | 中国科学院上海高等研究院 | A kind of AC signal amplitude accurate control circuit and method |
| CN107608443B (en) * | 2017-10-16 | 2019-03-12 | 中国科学院上海高等研究院 | A kind of AC signal amplitude accurate control circuit and method |
| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN110994991B (en) * | 2019-12-17 | 2021-05-14 | 华南理工大学 | Loop-free digital control method for isolated Buck-Boost circuit |
| CN113794368B (en) * | 2021-09-14 | 2023-10-27 | 珠海格力电器股份有限公司 | Control device and method of flyback switching power supply and flyback switching power supply |
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