CN108270357A - Switching Power Supply and its feedforward compensation circuit - Google Patents
Switching Power Supply and its feedforward compensation circuit Download PDFInfo
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- CN108270357A CN108270357A CN201611259794.9A CN201611259794A CN108270357A CN 108270357 A CN108270357 A CN 108270357A CN 201611259794 A CN201611259794 A CN 201611259794A CN 108270357 A CN108270357 A CN 108270357A
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- oxide
- metal
- semiconductor
- power supply
- switching power
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
Abstract
The invention discloses a kind of Switching Power Supply and its feedforward compensation circuit, the feedforward compensation circuit includes：Negative voltage identification module, negative voltage identification module are used to carry out the voltage on the feedback pin of Switching Power Supply negative voltage identification according to the secondary erasing time of Switching Power Supply to obtain feedback current corresponding with the primary input line voltage of Switching Power Supply；Current mirror module, current mirror module are used for according to feedback current through current mirror to generate compensation electric current, and compensation electric current are limited to obtain the compensation electric current after limiting according to the turn-on time of power switch pipe in Switching Power Supply；Electric current laminating module, electric current laminating module is used for the compensation electric current after limit and is added to the over-current detection pin of Switching Power Supply, with to the electric current of power switch pipe progress feedforward compensation.So that Switching Power Supply can obtain suitable current compensation amount either in light condition or heavy condition, ensure that Switching Power Supply exports constant electric current.
Description
Technical field
The present invention relates to power technique fields, more particularly to a kind of feedforward compensation circuit of Switching Power Supply has with one kind should
The Switching Power Supply of circuit.
Background technology
Switching Power Supply is to utilize modern power electronics technology, the time ratio of the turn-on and turn-off by controlling power switch pipe
Rate, to maintain to stablize a kind of power supply exported, Switching Power Supply can realize constant current constant voltage function.
In general, in order to ensure that Switching Power Supply can export constant electric current, using current compensation mode to power switch pipe
It is controlled, but current compensation way can only meet the compensation under full load conditions, for underloading and zero load, compensation rate
It is excessive.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of feedforward compensation circuits of Switching Power Supply so that Switching Power Supply
Either in light condition or heavy condition, suitable current compensation amount can be obtained, ensures that Switching Power Supply output is permanent
Fixed electric current.
It is another object of the present invention to propose a kind of Switching Power Supply.
To achieve the above object, one aspect of the present invention embodiment proposes a kind of feedforward compensation circuit of Switching Power Supply, packet
It includes：Negative voltage identification module, the negative voltage identification module are used for the secondary erasing time according to the Switching Power Supply to described
Voltage on the feedback pin of Switching Power Supply carries out negative voltage identification to obtain the primary input line voltage with the Switching Power Supply
Corresponding feedback current；Current mirror module, the current mirror module are used to pass through current mirror according to the feedback current
Electric current is compensated to generate, and the compensation electric current is limited according to the turn-on time of power switch pipe in the Switching Power Supply
To obtain the compensation electric current after limiting；Electric current laminating module, the electric current laminating module are used for the compensation electricity after the limitation
Stream is added on the over-current detection pin of the Switching Power Supply, to carry out feedforward compensation to the electric current of the power switch pipe.
The feedforward compensation circuit of Switching Power Supply according to embodiments of the present invention, by negative voltage identification module according to switch electricity
The secondary erasing time in source carries out negative voltage identification to the voltage on the feedback pin of Switching Power Supply, to obtain and Switching Power Supply
The corresponding feedback current of primary input line voltage, current mirror module is according to feedback current, by current mirror to generate compensation
Electric current, and compensation electric current is limited to obtain the compensation after limiting according to the turn-on time of power switch pipe in Switching Power Supply
Electric current, the compensation electric current after limitation is added on the over-current detection pin of Switching Power Supply by electric current laminating module, to open power
The electric current for closing pipe carries out feedforward compensation.So that Switching Power Supply is either in light condition or heavy condition, it can
Suitable current compensation amount is obtained, ensures that Switching Power Supply exports constant electric current.
According to one embodiment of present invention, the current mirror module includes：Bias voltage provides unit, the biasing
Voltage providing unit is used to provide bias voltage according to the first reference current；First order current mirror unit, the first order electricity
Traffic mirroring unit is used to carry out first order current mirror to the feedback current according to the bias voltage to export the compensation
Electric current；Second level current mirror unit, when the second level current mirror unit is used for the conducting according to the power switch pipe
Between to it is described compensation electric current limited to export the compensation electric current after the limitation；Third level current mirror unit, described
Tertiary current mirror image unit the compensation electric current after the limitation is replicated with by the compensation electric current after the limitation export to
The electric current laminating module.
According to one embodiment of present invention, the bias voltage provides unit and includes：First metal-oxide-semiconductor, the first MOS
The drain electrode of pipe is connected with the output terminal of first reference current, the grid of first metal-oxide-semiconductor respectively with first metal-oxide-semiconductor
Drain electrode be connected with the second level current mirror unit；Second metal-oxide-semiconductor, the grid of second metal-oxide-semiconductor is respectively with described
The drain electrode of the source electrode of one metal-oxide-semiconductor, second metal-oxide-semiconductor is connected with the first order current mirror unit, second metal-oxide-semiconductor
Source electrode is grounded.
According to one embodiment of present invention, the first order current mirror unit includes：Third metal-oxide-semiconductor, the third
The grid of metal-oxide-semiconductor provides unit with the bias voltage and is connected, the source electrode of the third metal-oxide-semiconductor and the feedback of the Switching Power Supply
Pin is connected；4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, the source electrode of the 4th metal-oxide-semiconductor are connected with the drain electrode of the third metal-oxide-semiconductor, institute
It states grid of the grid of the 4th metal-oxide-semiconductor respectively with the negative voltage identification module and the 5th metal-oxide-semiconductor to be connected, the described 5th
The source electrode of metal-oxide-semiconductor is connected with the second level current mirror unit；6th metal-oxide-semiconductor and the 7th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor
Grid is connected respectively with the source electrode of the 6th metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor and the grid of the 7th metal-oxide-semiconductor, institute
The source electrode for stating the 7th metal-oxide-semiconductor is connected with the drain electrode of the 5th metal-oxide-semiconductor；8th metal-oxide-semiconductor and the 9th metal-oxide-semiconductor, the 8th metal-oxide-semiconductor
Grid be connected respectively with the source electrode of the 8th metal-oxide-semiconductor, the drain electrode of the 6th metal-oxide-semiconductor and the grid of the 9th metal-oxide-semiconductor,
The source electrode of 9th metal-oxide-semiconductor is connected with the drain electrode of the 7th metal-oxide-semiconductor, drain electrode and the 8th MOS of the 9th metal-oxide-semiconductor
The drain electrode of pipe is connected.
According to one embodiment of present invention, the second level current mirror unit includes：Tenth metal-oxide-semiconductor and the 11st
Metal-oxide-semiconductor, the drain electrode of the tenth metal-oxide-semiconductor are connected with the first order current mirror unit, the grid of the tenth metal-oxide-semiconductor and institute
It states bias voltage unit is provided and be connected, the drain electrode of the 11st metal-oxide-semiconductor is connected with the source electrode of the tenth metal-oxide-semiconductor, and described the
The grid of 11 metal-oxide-semiconductors is connected with the drain electrode of the tenth metal-oxide-semiconductor, the source electrode ground connection of the 11st metal-oxide-semiconductor；First NOT gate,
The input terminal of first NOT gate is connected with the output terminal of the turn-on time of the power switch pipe；12nd metal-oxide-semiconductor, described
The grid of 12 metal-oxide-semiconductors is connected with the output terminal of first NOT gate, and the source electrode of the 12nd metal-oxide-semiconductor connects describedly；First
Capacitance, the drain electrode of one end of first capacitance respectively with the output terminal of the second reference current and the 12nd metal-oxide-semiconductor are connected,
Another termination of first capacitance is describedly；13rd metal-oxide-semiconductor and the 14th metal-oxide-semiconductor, the grid of the 13rd metal-oxide-semiconductor with
The grid of tenth metal-oxide-semiconductor is connected, and the grid of the 14th metal-oxide-semiconductor is connected with the grid of the 11st metal-oxide-semiconductor, described
The drain electrode of 14th metal-oxide-semiconductor is connected with the source electrode of the 13rd metal-oxide-semiconductor, and the source electrode of the 14th metal-oxide-semiconductor connects describedly；The
15 metal-oxide-semiconductors, the grid of the 15th metal-oxide-semiconductor are connected with one end of first capacitance, the source electrode of the 15th metal-oxide-semiconductor
Drain electrode with the 13rd metal-oxide-semiconductor is connected, the drain electrode of the 15th metal-oxide-semiconductor and the third level current mirror unit phase
Even.
According to one embodiment of present invention, the third level current mirror unit includes：16th metal-oxide-semiconductor and the 17th
Metal-oxide-semiconductor, the grid of the 16th metal-oxide-semiconductor respectively with the second level current mirror unit, the source electrode of the 16th metal-oxide-semiconductor
It is connected with the grid of the 17th metal-oxide-semiconductor, the source electrode of the 17th metal-oxide-semiconductor is connected with the electric current laminating module；Tenth
Eight metal-oxide-semiconductors and the 19th metal-oxide-semiconductor, the grid of the 18th metal-oxide-semiconductor respectively with the source electrode of the 18th metal-oxide-semiconductor, described
The drain electrode of 16 metal-oxide-semiconductors is connected with the grid of the 19th metal-oxide-semiconductor, the source electrode and the described 17th of the 19th metal-oxide-semiconductor
The drain electrode of metal-oxide-semiconductor is connected, and the drain electrode of the 19th metal-oxide-semiconductor is connected with the drain electrode of the 18th metal-oxide-semiconductor.
According to one embodiment of present invention, the negative voltage identification module includes：Second NOT gate, second NOT gate
Input terminal is connected with the Enable Pin of the feedforward compensation circuit；First NAND gate, the first input end of first NAND gate with
The output terminal of second NOT gate is connected, the second input terminal of first NAND gate and the output terminal phase of the erasing time
Even, the output terminal of second NAND gate is connected with the first order current mirror unit.
According to one embodiment of present invention, the electric current laminating module includes：The first resistor and second resistance of series connection,
One end of the first resistor is connected with the third level current mirror unit, the other end of the first resistor and described second
One end of resistance is connected, and the other end of the second resistance is connected with the over-current detection pin of the Switching Power Supply.
According to one embodiment of present invention, the feedforward compensation circuit is integrated in the control chip of the Switching Power Supply
It is interior.
In addition, the embodiment of the present invention also proposed a kind of Switching Power Supply, the feedforward including above-mentioned Switching Power Supply is mended
Repay circuit.
Switching Power Supply according to embodiments of the present invention by above-mentioned feedforward compensation circuit, enables to Switching Power Supply not
Pipe is in light condition or heavy condition, can obtain suitable current compensation amount, ensures that Switching Power Supply output is constant
Electric current.
Description of the drawings
Fig. 1 is the circuit diagram of Switching Power Supply according to embodiments of the present invention；
Fig. 2 is the block diagram of feedforward compensation circuit according to embodiments of the present invention；
Fig. 3 is the circuit diagram of feedforward compensation circuit according to an embodiment of the invention；
Fig. 4 is the working waveform figure of feedforward compensation circuit according to an embodiment of the invention；And
Fig. 5 is the block diagram of the control chip of Switching Power Supply according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
It describes the feedforward compensation circuit of the Switching Power Supply proposed according to embodiments of the present invention with reference to the accompanying drawings and has
The Switching Power Supply of the circuit.
Fig. 1 is the circuit diagram of Switching Power Supply according to embodiments of the present invention.As shown in Figure 1, the Switching Power Supply may include it is whole
Flow filter circuit, constant-current circuit and control chip IC.
Specifically, current rectifying and wave filtering circuit includes rectifier bridge and the wave filter being connected with the output terminal of the rectifier bridge, this is whole
Stream bridge is made of diode D1, D2, D3 and D4.Wave filter includes capacitance C2 and C3 in parallel and is connected to the anode of capacitance C2
Inductance L1 between the anode of capacitance C3.
Constant-current circuit includes armature winding LP, power switch pipe Q, secondary windings LS and feedback winding LA, wherein, it is primary around
One end of group LP is connected with the output terminal of current rectifying and wave filtering circuit, and the other end is connected with the collector of power switch pipe Q, power switch
With the driving pin DRI of chip IC is controlled to be connected, the emitter of power switch pipe Q is grounded the base stage of pipe Q by resistance R7, and
The emitter of power switch pipe Q is also connected with the over-current detection pin IFB for controlling chip IC.
One end of secondary windings LS is connected with diode D6 anodes, and diode D6 cathodes pass through resistance R8 and capacitance in parallel
C6 is connected with the other end of secondary windings LS.Feedback winding LA one end is connected ground connection with the rectifier bridge of current rectifying and wave filtering circuit, another
End by connect resistance R5 and resistance R6 ground connection, resistance R5 and resistance R6 partial pressure after with control chip IC feedback pin VFB
It is connected, feedback winding LA is also by diode D5 with controlling the power pin VDD of chip IC to be connected.
In addition, one end of armature winding LP after the resistance R3 of series connection, resistance R4 and capacitance C4 also by being grounded, and resistance
Power pin VDD of the tie point also respectively with the cathode of diode D5 and control chip IC between R4 and capacitance C4 is connected.
During Switching Power Supply works, when power switch pipe Q is in the conduction state, current rectifying and wave filtering circuit is to primary
Winding LP charges, and under the action of feedback winding LA, the feedback pin VFB of chip IC is controlled to obtain a negative voltage；Work as power
When switching tube Q is off, energy on armature winding LP is transmitted to secondary windings LS, diode D6 cathode with it is secondary around
Output voltage Vout is obtained between the other end of group LS, under the action of feedback winding LA, the output voltage Vout feedback to control
The feedback pin VFB of chip IC processed, therefore can only occur in the erasing time TDS of diode D6 to the detection of output voltage Vout
It is interior.Chip IC is controlled to calculate the turn-on time and working frequency for obtaining power switch pipe Q according to the output voltage Vout of feedback, is led to
It crosses and turn-on and turn-off control is carried out to power switch pipe Q, realize constant current constant voltage function.
In the relevant technologies, shown in for example following formula (1) of realization of constant current function：
Wherein, Iout is the output current of Switching Power Supply, and Np is the number of turn of armature winding LP, and Ns is the circle of secondary windings LS
Number, TDS are the secondary erasing time of the erasing time, i.e. Switching Power Supply of diode D6, and T is the work period, and Ip is power switch
The peak point current of pipe Q.
After hardware circuit determines, Np/Ns is constant, it is seen then that it is constant for the output current Iout of Switching Power Supply, only need
Ensure that erasing time duty ratio TDS/T and peak point current Ip are constant.
And the constant of TDS/T is mainly realized jointly by PWM (or PFM) modules and erasing time sampling module, according to
TDS sizes that erasing time sampling module samples control the working frequency of power switch pipe Q, it is ensured that TDS/T is constant.Peak value
Electric current Ip it is constant be by the control constant overcurrent protection benchmark Vocp of chip IC inner setting, and with control chip IC
Pressure drop on the resistance R7 of over-current detection pin IFB samplings is compared realization, when the quasi- Vocp of overcurrent protecting group is constant, peak value
Electric current Ip is constant, wherein, peak point current Ip=Vocp/R7.
It, can there are one from the voltage drop detection of resistance R7 to control power switch pipe Q shutdowns but during actually controlling
Fixed delay, it is assumed that this section of delay time is Δ t, then, when the electric current of power switch pipe Q rises to the peak point current Ip of setting
When, by controlling detection and the logical process of chip IC, most at last after the Δ t times that are delayed, the Q shutdowns of control power switch pipe.
And within the Δ t times, since power switch pipe Q is in the conduction state, the electric current of power switch pipe Q will continue to rise, therefore
When power switch pipe Q is turned off, the electric current Ip1 of practical power switch pipe Q should be：
Ip1=Ip+ Δs Ip (2)
Wherein, Δ Ip is the electric current rising value of delay time Δ t internal power switching tubes Q.
That is, the output current of practical Switching Power Supply should be：
Wherein,Primary input line voltages of the VIN for Switching Power Supply, i.e. voltage after rectifying and wave-filtering, Lp
Inductance value for armature winding LP.
For specifically controlling for chip IC, above-mentioned delay time Δ t can be considered constant, it is seen then that Δ Ip can be followed just
Grade input line voltage VIN and armature winding inductance value Lp variation and change, therefore, the output current Iout of Switching Power Supply
It can be had differences as VIN and Lp is different, it is undesirable to eventually lead to constant current output effect.
For constant current output effect it is undesirable the problem of, can control chip IC inside add in current mirror, with generate
The compensation electric current Icomp directly proportional to VIN is compensated, and principle is as follows：When power switch pipe Q is connected, feedback pin VFB's
Voltage is directly proportional with VIN, has relationship with armature winding LP and feedback winding LA, is identified by resistance by feedback pin VFB's
Voltage is converted to electric current, and passes through current mirror and obtain a compensation electric current Icomp directly proportional with VIN, then pass through resnstance transformer
On over-current detection pin IFB, obtained offset voltage Vcomp is：
Wherein, Na is the number of turn of feedback winding LA, and Rlc is that will compensate current compensation in over-current detection pin by resistance
Resistance on IFB, Klc are the toatl proportion coefficient of current mirror.
Then, with reference to above-mentioned formula (3), the output current after overcompensation is：
As long as that is, ensureIt just may be such that the electric current after compensation is equal to the peak of control chip IC inner setting
It is worth electric current Ip, so as to achieve the effect that constant current.
Further, with reference to above-mentioned formula (4) andIt can obtain：
Under the premise of the inductance value Lp of armature winding is fixed, as long as ensureingIt is i.e. reachable
To the purpose of sophisticated systems output constant current effect.
Above-mentioned compensation way is under the premise of the inductance value Lp of armature winding is fixed, by generating all the way with VIN into just
The compensation electric current Icomp (mono- timings of VIN, which is constant) of ratio compensates to realize.When control chip IC is with constant current mould
Formula run when, the compensation electric current Icomp according to full load conditions set, therefore, when control chip IC be in full load, this
Compensation rate is reasonable, and when light unloaded, since the minimum value of peak point current is smaller so that compensation is excessive, and then leads to work(
The minimum turn-on time of rate switching tube Q is shorter, it is easy to be blanked, the waveform of feedback pin VFB is caused difference, final band occur
Carry out sampling error, this phenomenon is more obvious in primary input line voltage VIN higher.Therefore, by introducing turn-on time
Ton, the smaller situation of peak point current to carry out compensation electric current when primary input line voltage is larger and under light no-load condition
Limitation, in order to avoid there is the problem of compensation is excessive.
Fig. 2 is the block diagram of the feedforward compensation circuit of Switching Power Supply according to embodiments of the present invention.As shown in Fig. 2,
The feedforward compensation circuit 100 of the Switching Power Supply includes：Negative voltage identification module 110, current mirror module 120 and electric current superposition mould
Block 130.
Wherein, negative voltage identification module 110 is used for the secondary erasing time TDS according to Switching Power Supply to the anti-of Switching Power Supply
Voltage on feedback pin VFB carries out negative voltage identification to obtain feedback electricity corresponding with the primary input line voltage of Switching Power Supply
Stream.Current mirror module 120 is used for according to feedback current through current mirror to generate compensation electric current, and according in Switching Power Supply
The turn-on time Ton of power switch pipe limits compensation electric current to obtain the compensation electric current after limiting.Electric current laminating module
The 130 over-current detection pins for being added to Switching Power Supply for the compensation electric current after limiting, with the electric current to power switch pipe
Carry out feedforward compensation.
Specifically, the detection of output voltage was happened in the erasing time of diode D6, and the electric current of power switch pipe Q
Compensation be happened at power switch pipe Q conducting during, therefore, can be according to secondary erasing time TDS to the feedback of Switching Power Supply
Voltage on pin VFB carries out negative voltage identification, that is, as secondary erasing time TDS=0, current mirror module 120 starts root
According to the corresponding feedback currents of primary input line voltage VIN of Switching Power Supply, compensation electric current Icomp is generated by current mirror.
Also, big due to compensating electric current needed for full load, required compensation electric current is small when being lightly loaded or is unloaded, and the work(of full load
The turn-on time Ton long of rate switching tube Q, the turn-on time Ton of power switch pipe Q at light load are short.The conducting of power switch pipe Q
Time is also and primary input line voltage is related, and when primary input line voltage is higher, the Ton times are short, and primary input line voltage is relatively low
When, the Ton times are longer.Therefore, compensation electric current Icomp can be limited according to turn-on time Ton.That is, full load, passes through
The longer Ton times to carry out the limitation of very little to compensation electric current Icomp or there is no limit；By the shorter Ton times come
Larger limitation is carried out, and what is limited when primary input line voltage is higher becomes apparent to compensation electric current Icomp so that limitation
Compensation electric current Icomp ' afterwards is more rationally.Finally, the compensation electric current Icomp ' after limitation is passed through electricity by electric current laminating module 130
Resistance is added on the over-current detection pin IFB of Switching Power Supply, to carry out feedforward compensation to the electric current of power switch pipe, effectively prevent
Underloading or it is unloaded when because of compensation electric current excessive the problem of leading to overcompensation, while can ensure the current compensation of full load.
According to one embodiment of present invention, as shown in figure 3, current mirror module 120 may include：Bias voltage provides single
Member 121, first order current mirror unit 122, second level current mirror unit 123 and third level current mirror unit 124.Biasing
Voltage providing unit 121 is used to provide bias voltage according to the first reference current, and first order current mirror unit 122 is used for basis
Bias voltage carries out feedback current first order current mirror to export compensation electric current Icomp, second level current mirror unit 123
Compensation electric current Icomp is limited with the compensation electric current after export-restriction for the turn-on time Ton according to power switch pipe
Icomp ', third level current mirror unit 124 replicate the compensation electric current Icomp ' after limitation with the compensation after limiting
Electric current Icomp ' outputs are to electric current laminating module 130.
Further, according to one embodiment of present invention, as shown in figure 3, bias voltage offer unit 121 may include：
First metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2.Wherein, the drain electrode of the first metal-oxide-semiconductor Q1 is connected with the output terminal bp of the first reference current, the
The grid of one metal-oxide-semiconductor Q1 is connected respectively with the drain electrode of the first metal-oxide-semiconductor Q1 and second level current mirror unit 123；Second metal-oxide-semiconductor Q2
Grid be connected respectively with the source electrode of the first metal-oxide-semiconductor Q1, the drain electrode of the second metal-oxide-semiconductor Q2 and first order current mirror unit 122,
The source electrode ground connection of two metal-oxide-semiconductor Q2.
According to one embodiment of present invention, as shown in figure 3, first order current mirror unit 122 may include：3rd MOS
Pipe Q3, the 4th metal-oxide-semiconductor Q4, the 5th metal-oxide-semiconductor Q5, the 6th metal-oxide-semiconductor Q6, the 7th metal-oxide-semiconductor Q7, the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor
Q9.Wherein, the grid of third metal-oxide-semiconductor Q3 provides unit 121 with bias voltage and is connected, source electrode and the switch electricity of third metal-oxide-semiconductor Q3
The feedback pin VFB in source is connected；The source electrode of 4th metal-oxide-semiconductor Q4 is connected with the drain electrode of third metal-oxide-semiconductor Q3, the grid of the 4th metal-oxide-semiconductor Q4
Grid of the pole respectively with 110 and the 5th metal-oxide-semiconductor Q5 of negative voltage identification module is connected, source electrode and the second level electricity of the 5th metal-oxide-semiconductor Q5
Traffic mirroring unit 123 is connected；The drain electrode with the source electrode, the 4th metal-oxide-semiconductor Q4 of the 6th metal-oxide-semiconductor Q6 respectively of the grid of 6th metal-oxide-semiconductor Q6
It is connected with the grid of the 7th metal-oxide-semiconductor Q7, the source electrode of the 7th metal-oxide-semiconductor Q7 is connected with the drain electrode of the 5th metal-oxide-semiconductor Q5；8th metal-oxide-semiconductor Q8
Grid be connected respectively with the source electrode of the 8th metal-oxide-semiconductor Q8, the drain electrode of the 6th metal-oxide-semiconductor Q6 and the grid of the 9th metal-oxide-semiconductor Q9, the 9th
The source electrode of metal-oxide-semiconductor Q9 is connected with the drain electrode of the 7th metal-oxide-semiconductor Q7, the drain electrode of the 9th metal-oxide-semiconductor Q9 and the drain electrode phase of the 8th metal-oxide-semiconductor Q8
Even.
According to one embodiment of present invention, as shown in figure 3, second level current mirror unit 123 may include：Tenth MOS
Pipe Q10, the 11st metal-oxide-semiconductor Q11, the first NOT gate NO1, the 12nd metal-oxide-semiconductor Q12, the first capacitance C1, the 13rd metal-oxide-semiconductor Q13,
14 metal-oxide-semiconductor Q14, the 15th metal-oxide-semiconductor Q15.The drain electrode of tenth metal-oxide-semiconductor Q10 is connected with first order current mirror unit 121, the
The grid of ten metal-oxide-semiconductor Q10 provides unit 121 with bias voltage and is connected, drain electrode and the tenth metal-oxide-semiconductor Q10 of the 11st metal-oxide-semiconductor Q11
Source electrode be connected, the grid of the 11st metal-oxide-semiconductor Q11 is connected with the drain electrode of the tenth metal-oxide-semiconductor Q10, the source electrode of the 11st metal-oxide-semiconductor Q11
Ground connection；The input terminal of first NOT gate NO1 is connected with the output terminal of the turn-on time Ton of power switch pipe Q；12nd metal-oxide-semiconductor Q12
Grid be connected with the output terminal of the first NOT gate NO1, the source electrode of the 12nd metal-oxide-semiconductor Q12 ground connection；One end difference of first capacitance C1
Drain electrode with the output terminal bp1 and the 12nd metal-oxide-semiconductor Q12 of the second reference current is connected, the other end ground connection of the first capacitance C1；The
The grid of 13 metal-oxide-semiconductor Q13 is connected with the grid of the tenth metal-oxide-semiconductor Q10, the grid and the 11st metal-oxide-semiconductor of the 14th metal-oxide-semiconductor Q14
The grid of Q11 is connected, and the drain electrode of the 14th metal-oxide-semiconductor Q14 is connected with the source electrode of the 13rd metal-oxide-semiconductor Q13, the 14th metal-oxide-semiconductor Q14's
Source electrode is grounded；The grid of 15th metal-oxide-semiconductor Q15 is connected with one end of the first capacitance C1, the source electrode of the 15th metal-oxide-semiconductor Q15 and
The drain electrode of 13 metal-oxide-semiconductor Q13 is connected, and the drain electrode of the 15th metal-oxide-semiconductor Q15 is connected with third level current mirror unit 124.
According to one embodiment of present invention, as shown in figure 3, third level current mirror unit 124 includes：16th MOS
Pipe Q16, the 17th metal-oxide-semiconductor Q17, the 18th metal-oxide-semiconductor Q18 and the 19th metal-oxide-semiconductor Q19.The grid difference of 16th metal-oxide-semiconductor Q16
It is connected with second level current mirror unit 123, the source electrode of the 16th metal-oxide-semiconductor Q16 and the grid of the 17th metal-oxide-semiconductor Q17, the 17th
The source electrode of metal-oxide-semiconductor Q17 is connected with electric current laminating module 130；The grid of 18th metal-oxide-semiconductor Q18 respectively with the 18th metal-oxide-semiconductor Q18
The drain electrode of source electrode, the 16th metal-oxide-semiconductor Q16 be connected with the grid of the 19th metal-oxide-semiconductor Q19, the source electrode of the 19th metal-oxide-semiconductor Q19 with
The drain electrode of 17th metal-oxide-semiconductor Q17 is connected, and the drain electrode of the 19th metal-oxide-semiconductor Q19 is connected with the drain electrode of the 18th metal-oxide-semiconductor Q18.
According to one embodiment of present invention, as shown in figure 3, negative voltage identification module 110 may include：Second NOT gate NO2
It is connected with the input terminal of the first NAND gate ANDO1, the second NOT gate NO2 with the Enable Pin EN of feedforward compensation circuit；First NAND gate
The first input end of ANDO1 is connected with the output terminal of the second NOT gate NO2, the second input terminal of the first NAND gate ANDO1 and demagnetization
The output terminal of time TDS is connected, and the output terminal of the second NAND gate NO2 is connected with first order current mirror unit 122.
According to one embodiment of present invention, as shown in figure 3, electric current laminating module 130 may include：The first resistor of series connection
One end of R1 and second resistance R2, first resistor R1 are connected with third level current mirror unit 124, the other end of first resistor R1
It is connected with one end of second resistance R2, the other end of second resistance R2 is connected with the over-current detection pin IFB of Switching Power Supply.
Specifically, as shown in figure 3, when control chip IC run with constant current mode when, the Enable Pin of feedforward compensation circuit
EN=1, and as TDS=0, i.e., at the end of the erasing time of Switching Power Supply, primary input line voltage VIN passes through armature winding
LP and feedback winding LA is refracted to the feedback pin VFB of control chip IC, then is converted into feedback current by divider resistance, that is, opens
The corresponding feedback current Ils of primary input voltage in powered-down source is：
As EN=1 and TDS=0, the output terminal of the first NAND gate AND1 is high level signal, and be applied to the 4th MOS
On pipe Q4, first order current mirror unit 122, which starts feedback current Ils corresponding to the primary input voltage of Switching Power Supply, to carry out
Mirror image finally obtains compensation electric current Icomp in the source electrode of the 5th metal-oxide-semiconductor Q5.
Then, second level current mirror unit 123 is controlled by the turn-on time Ton of power switch pipe Q, with right
Compensation electric current Icomp is limited.Wherein, as Ton=0, the output terminal of the first NOT gate is high level signal, the 12nd MOS
Pipe Q12 is in the conduction state, and the voltage on the first capacitance C1 pulled down to ground, the gate source voltage V of the 15th metal-oxide-semiconductorGSLess than
The voltage threshold V of 15 metal-oxide-semiconductorsTH, the 15th metal-oxide-semiconductor is operated in cut-off state, the drain electrode no current of the 15th metal-oxide-semiconductor；Work as Ton
When=1, the output terminal of the first NOT gate is low level signal, and the 12nd metal-oxide-semiconductor Q12 is off, at this time the second benchmark electricity
Stream starts to charge to the first capacitance C1, the grid voltage V of the 15th metal-oxide-semiconductor Q15GFor：
Wherein, Δ t1 is the charging time, and Ibp1 is the second reference current.
With Ton times, gate source voltage VGSIt is continuously increased and (supply voltage can be reached), work as VGS＞ VTHWhen, the 15th
Metal-oxide-semiconductor Q15 is begun to turn on.As shown in figure 4, when light unloaded, since the Ton times are shorter, the grid voltage of the 15th metal-oxide-semiconductor Q15
VGOne is charged to than relatively low value, flows through the electric current very little of current mirror, the electric current of the branch is limited by the 15th metal-oxide-semiconductor Q15
System, it is impossible to which complete mirror image by adjusting rational capacitance, can obtain underloading and unloaded next rational feedforward compensation
Value；Full load, since the Ton times are very long, gate source voltage VGSIt is continuously increased, the electric current of the branch also increases, as gate source voltage VGS
When increasing to a certain extent, the electric current of the branch is just mainly limited by current mirror, and current mirror perfect can replicate at this time
Electric current all the way obtains the feedforward compensation value under constant current operation stateWherein, Klc'
Total current for first order current mirror unit 122, second level current mirror unit 123 and third level current mirror unit 124
Mirror image coefficient.
The feedforward compensation circuit of Switching Power Supply according to embodiments of the present invention, in power switch pipe turn-on time, switch
The primary input line voltage of power supply is refracted to the feedback pin of control chip by armature winding and feedback winding, and passes through partial pressure
Resistance generates a feedback current directly proportional to primary input line voltage, is then compensated electricity by rational current mirror
Stream, and being limited with the turn-on time Ton of power switch pipe compensation electric current, with input line voltage is higher, power is opened
When the peak point current of pass pipe is smaller, ensure that compensation electric current will not be excessive.
In an embodiment of the present invention, feedforward compensation circuit 100 is integrated in the control chip IC of Switching Power Supply.
Specifically, as shown in figure 5, control chip IC may include that start-up circuit 201, reference offset circuit 202, line voltage are mended
Repay circuit 203, sampling hold circuit 204, error amplifying circuit 205, constant-current and constant-voltage control circuit 206, logic processing circuit
207th, driving circuit 208, erasing time sampling module 209, tremble frequency circuit 210, current foldback circuit 211 and feedforward compensation circuit
100。
Wherein, start-up circuit 201 is for giving the voltage threshold that chip is switched on and off, to control the unlatching of chip and pass
It is disconnected, and realize the under-voltage protection function of power vd D, provide low-pressure section circuit work power and enable signal；Reference offset electricity
Road 202 is used to provide benchmark and biasing；Line voltage compensation circuit 203 is compensating input line voltage；Sampling keeps electricity
Road 204 is used to be detected by the feedback pin VFB to control chip IC, realizes the sampling and holding to output voltage, and
It is supplied to error amplifying circuit 205；Error amplifying circuit 205 is used between output voltage and given reference voltage V REF_EA
Difference carry out error amplification, and be supplied to constant-current and constant-voltage control circuit 206；Constant-current and constant-voltage control circuit 206 is put according to error
The turn-on time and working frequency of the output adjustment power switch pipe of big circuit 205；Erasing time sampling module 209 is used to pass through
The feedback pin VFB for controlling chip IC is detected, to obtain the erasing time TDS of each cycle；Feedforward compensation circuit 100 is used
It is compensated in the electric current to power switch pipe；Current foldback circuit 211 is used to set rational over-current protection point；Logical process
Circuit 207 controls the open and close of power switch pipe for handling the logical signal of prime；Driving circuit 208 is used
In driving power switching tube.How control chip IC works, and I will not elaborate.
In conclusion the feedforward compensation circuit of Switching Power Supply according to embodiments of the present invention, passes through negative voltage identification module
According to the secondary erasing time of Switching Power Supply on the feedback pin of Switching Power Supply voltage carry out negative voltage identification, with obtain with
The corresponding feedback current of primary input line voltage of Switching Power Supply, current mirror module pass through current mirror according to feedback current
Electric current is compensated to generate, and compensation electric current is limited to obtain limit according to the turn-on time of power switch pipe in Switching Power Supply
Compensation electric current after limitation is added on the over-current detection pin of Switching Power Supply by the compensation electric current after system, electric current laminating module,
To carry out feedforward compensation to the electric current of power switch pipe.So that Switching Power Supply is either in light condition or heavily loaded shape
State can obtain suitable current compensation amount, ensure that Switching Power Supply exports constant electric current.
In addition, the embodiment of the present invention also proposed a kind of Switching Power Supply, as shown in Figure 1, it includes above-mentioned switch electricity
The feedforward compensation circuit in source.It is specific that I will not elaborate.
Switching Power Supply according to embodiments of the present invention by above-mentioned feedforward compensation circuit, enables to Switching Power Supply not
Pipe is in light condition or heavy condition, can obtain suitable current compensation amount, ensures that Switching Power Supply output is constant
Electric current.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, " multiple " are meant that at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature right over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " example ", " is specifically shown " some embodiments "
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments or examples described in this specification and the feature of different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of feedforward compensation circuit of Switching Power Supply, which is characterized in that including：
Negative voltage identification module, the negative voltage identification module are used for the secondary erasing time according to the Switching Power Supply to described
Voltage on the feedback pin of Switching Power Supply carries out negative voltage identification to obtain the primary input line voltage with the Switching Power Supply
Corresponding feedback current；
Current mirror module, the current mirror module are used for electric to generate compensation by current mirror according to the feedback current
Stream, and the compensation electric current is limited with after acquisition limitation according to the turn-on time of power switch pipe in the Switching Power Supply
Compensation electric current；
Electric current laminating module, the electric current laminating module are used to the compensation electric current after the limitation being added to the Switching Power Supply
Over-current detection pin on, with to the electric current of the power switch pipe carry out feedforward compensation.
2. the feedforward compensation circuit of Switching Power Supply as described in claim 1, which is characterized in that the current mirror module packet
It includes：
Bias voltage provides unit, and the bias voltage provides unit and is used to provide bias voltage according to the first reference current；
First order current mirror unit, the first order current mirror unit are used for according to the bias voltage to the feedback electricity
Stream carries out first order current mirror to export the compensation electric current；
Second level current mirror unit, the second level current mirror unit are used for the turn-on time according to the power switch pipe
The compensation electric current is limited to export the compensation electric current after the limitation；
Third level current mirror unit, the third level current mirror unit compensation electric current after the limitation is replicated with
Compensation electric current after the limitation is exported to the electric current laminating module.
3. the feedforward compensation circuit of Switching Power Supply as claimed in claim 2, which is characterized in that the bias voltage provides unit
Including：
First metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor are connected with the output terminal of first reference current, first metal-oxide-semiconductor
Grid be connected respectively with the drain electrode of first metal-oxide-semiconductor and the second level current mirror unit；
Second metal-oxide-semiconductor, the grid leakage with the source electrode of first metal-oxide-semiconductor, second metal-oxide-semiconductor respectively of second metal-oxide-semiconductor
Pole is connected with the first order current mirror unit, the source electrode ground connection of second metal-oxide-semiconductor.
4. the feedforward compensation circuit of Switching Power Supply as claimed in claim 3, which is characterized in that the first order current mirror list
Member includes：
Third metal-oxide-semiconductor, grid and the bias voltage of the third metal-oxide-semiconductor provide unit and are connected, the source of the third metal-oxide-semiconductor
Pole is connected with the feedback pin of the Switching Power Supply；
4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, the source electrode of the 4th metal-oxide-semiconductor are connected with the drain electrode of the third metal-oxide-semiconductor, and described
Grid of the grid of four metal-oxide-semiconductors respectively with the negative voltage identification module and the 5th metal-oxide-semiconductor is connected, the 5th metal-oxide-semiconductor
Source electrode be connected with the second level current mirror unit；
6th metal-oxide-semiconductor and the 7th metal-oxide-semiconductor, the grid of the 6th metal-oxide-semiconductor respectively with the source electrode of the 6th metal-oxide-semiconductor, described
The drain electrode of four metal-oxide-semiconductors is connected with the grid of the 7th metal-oxide-semiconductor, the source electrode of the 7th metal-oxide-semiconductor and the leakage of the 5th metal-oxide-semiconductor
Extremely it is connected；
8th metal-oxide-semiconductor and the 9th metal-oxide-semiconductor, the grid of the 8th metal-oxide-semiconductor respectively with the source electrode of the 8th metal-oxide-semiconductor, described
The drain electrode of six metal-oxide-semiconductors is connected with the grid of the 9th metal-oxide-semiconductor, the source electrode of the 9th metal-oxide-semiconductor and the leakage of the 7th metal-oxide-semiconductor
Extremely it is connected, the drain electrode of the 9th metal-oxide-semiconductor is connected with the drain electrode of the 8th metal-oxide-semiconductor.
5. the feedforward compensation circuit of Switching Power Supply as claimed in claim 4, which is characterized in that the second level current mirror list
Member includes：
Tenth metal-oxide-semiconductor and the 11st metal-oxide-semiconductor, the drain electrode of the tenth metal-oxide-semiconductor are connected with the first order current mirror unit, institute
It states the grid of the tenth metal-oxide-semiconductor and the bias voltage provides unit and is connected, the drain electrode and the described tenth of the 11st metal-oxide-semiconductor
The source electrode of metal-oxide-semiconductor is connected, and the grid of the 11st metal-oxide-semiconductor is connected with the drain electrode of the tenth metal-oxide-semiconductor, the 11st MOS
The source electrode ground connection of pipe；
First NOT gate, the input terminal of first NOT gate are connected with the output terminal of the turn-on time of the power switch pipe；
12nd metal-oxide-semiconductor, the grid of the 12nd metal-oxide-semiconductor are connected with the output terminal of first NOT gate, the 12nd MOS
The source electrode of pipe connects describedly；
First capacitance, one end of first capacitance respectively with the output terminal of the second reference current and the 12nd metal-oxide-semiconductor
Drain electrode is connected, and another termination of first capacitance is describedly；
13rd metal-oxide-semiconductor and the 14th metal-oxide-semiconductor, the grid of the 13rd metal-oxide-semiconductor are connected with the grid of the tenth metal-oxide-semiconductor,
The grid of 14th metal-oxide-semiconductor is connected with the grid of the 11st metal-oxide-semiconductor, the drain electrode of the 14th metal-oxide-semiconductor with it is described
The source electrode of 13rd metal-oxide-semiconductor is connected, and the source electrode of the 14th metal-oxide-semiconductor connects describedly；
15th metal-oxide-semiconductor, the grid of the 15th metal-oxide-semiconductor are connected with one end of first capacitance, the 15th metal-oxide-semiconductor
Source electrode be connected with the drain electrode of the 13rd metal-oxide-semiconductor, the drain electrode of the 15th metal-oxide-semiconductor and the third level current mirror list
Member is connected.
6. the feedforward compensation circuit of Switching Power Supply as claimed in claim 5, which is characterized in that the third level current mirror list
Member includes：
16th metal-oxide-semiconductor and the 17th metal-oxide-semiconductor, the grid of the 16th metal-oxide-semiconductor respectively with the second level current mirror list
The source electrode of first, described 16th metal-oxide-semiconductor is connected with the grid of the 17th metal-oxide-semiconductor, the source electrode of the 17th metal-oxide-semiconductor and institute
Electric current laminating module is stated to be connected；
18th metal-oxide-semiconductor and the 19th metal-oxide-semiconductor, the grid of the 18th metal-oxide-semiconductor source with the 18th metal-oxide-semiconductor respectively
The drain electrode of pole, the 16th metal-oxide-semiconductor is connected with the grid of the 19th metal-oxide-semiconductor, the source electrode of the 19th metal-oxide-semiconductor and institute
The drain electrode for stating the 17th metal-oxide-semiconductor is connected, and the drain electrode of the 19th metal-oxide-semiconductor is connected with the drain electrode of the 18th metal-oxide-semiconductor.
7. the feedforward compensation circuit of Switching Power Supply as claimed in claim 2, which is characterized in that the negative voltage identification module packet
It includes：
Second NOT gate, the input terminal of second NOT gate are connected with the Enable Pin of the feedforward compensation circuit；
First NAND gate, the first input end of first NAND gate are connected with the output terminal of second NOT gate, and described first
Second input terminal of NAND gate is connected with the output terminal of the erasing time, the output terminal of second NAND gate and described first
Grade current mirror unit is connected.
8. the feedforward compensation circuit of Switching Power Supply as claimed in claim 2, which is characterized in that the electric current laminating module packet
It includes：
The first resistor and second resistance of series connection, one end of the first resistor are connected with the third level current mirror unit,
The other end of the first resistor is connected with one end of the second resistance, the other end of the second resistance and the switch electricity
The over-current detection pin in source is connected.
9. the feedforward compensation circuit of Switching Power Supply as described in claim 1, which is characterized in that the feedforward compensation circuit integrates
In the control chip of the Switching Power Supply.
10. a kind of Switching Power Supply, which is characterized in that include the feedforward of Switching Power Supply as claimed in any one of claims 1-9 wherein
Compensation circuit.
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| CN201611259794.9A CN108270357B (en) | 2016-12-30 | 2016-12-30 | Switching power supply and feedforward compensation circuit thereof |
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| CN201611259794.9A CN108270357B (en) | 2016-12-30 | 2016-12-30 | Switching power supply and feedforward compensation circuit thereof |
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