CN106787629A - A kind of circuit and method suitable for high power switching power supply parallel current-sharing - Google Patents
A kind of circuit and method suitable for high power switching power supply parallel current-sharing Download PDFInfo
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- CN106787629A CN106787629A CN201710081601.3A CN201710081601A CN106787629A CN 106787629 A CN106787629 A CN 106787629A CN 201710081601 A CN201710081601 A CN 201710081601A CN 106787629 A CN106787629 A CN 106787629A
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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
- H02M1/00—Details of apparatus for conversion
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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Abstract
The invention discloses a kind of circuit and method suitable for high power switching power supply parallel current-sharing, including transformer, transformer prime is conventional active pincers or double normal shocks, and transformer rear class is made up of rectifying tube, inductance, output capacitance, stream sample circuit, stream regulation circuit, sampling feedback circuit；Present invention reduces equal stream error, fiducial error from ± 1.5% reduces to ± 0.48%, improve the precision of multiple power module parallel current-sharings, improve closed-loop bandwidth and gain, improve the reliability of power module, stability, transient response.
Description
Technical field
The invention belongs to field of electronics, it is related to multiple high power switching power supplies, and in particular to one kind is applied to big work(
Circuit and method that rate switch power parallel flows.
Background technology
With the lifting of the various performances of semiconductor, the requirement more and more higher to Switching Power Supply, high power density is highly reliable
Property, small size, systematization is the main flow direction of Switching Power Supply development, and the power module of single power can not increasingly meet now
System-level requirement, the multiple high power switching power supply power modules emphasis as switch power technology development in parallel are and single
Power supply is powered and is compared, and parallel operation system can make system keep reliability higher, as needed configuring redundancy system, realize
Power supply capacity it is extendible, realize high efficiency, reduces cost realizes standardization and modularization of power module etc..
In a system, due to the significantly lifting of power supply capacity needed for system, thermal stress and current stress are caused
Power module it is hot unbalanced, the service life of power module is greatly lowered, the volume of single power module is also significantly
Improve, the utilization rate of power module is not also high, and power module is unable to dilatation, using dumb, when power supply breaks down,
Whole system is stopped, very big hidden danger is caused to system job stability.It is in parallel for the defective of single power supply
Needed for stream turns into market, enable the electric current autobalance that each power module bears, realization is flowed, when switching is loaded,
Transient response is good, and bandwidth is small, reduces noise, is the basic demand for flowing design.
Conventional high-power parallel current-sharing circuit uses the rear class control of the sharing control chip such as UC2907, UCC29002 at present
Current equalizing method processed, in course of normal operation, flowing bus PR can be determined by monitoring the output current of each power module
The maximum power module of output current, and it is set to main control module, PR ends are by the sampled voltage ratio with other power modules
Compared with by internal adjustment amplifier, the reference voltage of other power modules being adjusted, so as to adjust the output of each power module
Electric current, balances the output current of each power module.When the output current of another power module becomes maximum, bus is flowed
This power module is positioned into master control power module, the output voltage of other power modules is adjusted, makes the defeated of each power module
Go out electric current within certain error range.It is above-mentioned to have the following disadvantages：1st, stream precision is not high, the reference voltage essence of UC2907
It is 2 ± 1.5% to spend, and the output voltage for adjusting each power module is exactly the sampled voltage of master control voltage and each power module
Comparing, be adjusted amplifier control triode open with shut-off, adjust the reference voltage of UC2907, and reference voltage
The error of precision is larger, causes the error of output voltage to increase, and increases the stream degree of unbalancedness of power module, especially multiple
It is more obvious during power module parallel current-sharing.2nd, closed-loop narrow bandwidth, in high/low temperature（-40℃~85℃）Under state, power supply mould
Block less stable, when multiple power modules are in parallel, narrower bandwidth causes bandwidth allowance not enough, and power module is easy to be occurred
Self-excitation, utters long and high-pitched sounds, the wild effect such as output voltage virtual height, and the batch production to power module causes larger trouble.3rd,
Stream limited adjustment range, output current collection and stream precision can not be adjusted.Can not be free to adjust according to needed for power module
Section, such as the parallel connection of different capacity power module.
The content of the invention
The present invention is in order to solve above-mentioned stream precision phenomenon not high and stream limited adjustment range, there is provided one
Plant the circuit suitable for high power switching power supply parallel current-sharing.
The present invention is adopted the following technical scheme that：A kind of circuit suitable for high power switching power supply parallel current-sharing, including become
Depressor, transformer prime is conventional active pincers or double normal shocks, and transformer rear class is adopted by rectifying tube, inductance, output capacitance, stream
Sample circuit, stream regulation circuit, sampling feedback circuit composition；Transformer B1 one end respectively with rectifying tube D1 anodes, resistance R1
One end connects, and the resistance R1 other ends are connected with one end of electric capacity C1, the negative electrode of rectifying tube D1 respectively with rectifying tube D2 negative electrodes, resistance
One end connection of R2, the other end of electric capacity C1 and inductance L1, the other end of inductance L1 respectively with electric capacity CN1 one end, sampling feedback
Circuit on one side and stream regulation circuit on one side connection, the electric capacity CN1 other ends return to change after connecting with the sampling feedback circuit other end
The other end of depressor, stream regulation circuit return to the other end of transformer, resistance R2 and electric capacity after being connected with stream sample circuit
Connect with the anode of rectifying tube D2 after C2 series connection and return to the other end of transformer.
Stream sample circuit by operational amplifier IC3, diode D3, resistance R14, resistance R15, resistance R16, resistance R17,
Current sampling resistor R18 and electric capacity C6 is constituted；Transformer is connected with current sampling resistor R18 one end, resistance R16 one end respectively,
The current sampling resistor R18 other ends 4 pin respectively with IC3 operational amplifiers, one end of resistance R17 connect, the resistance R17 other ends
3 pin of operational amplifier IC3 are connected to, 4 pin of IC3 operational amplifiers are grounded, wherein, 8 pin of operational amplifier IC3 connect power supply,
1,2,3 pin of operational amplifier IC3 are one group, and 1 pin output, 2 pin input is negative, and 3 pin are input into just, operational amplifier IC3 5,
6th, 7 pin are another group, and 5 pin are input into just, and the input of 6 pin is negative, the output of 7 pin, and the resistance R16 other ends are respectively with the 2 of operational amplifier IC3
Pin, electric capacity C6 connect, and electric capacity C6 connects after being connected with resistance R14 with 1 pin of operational amplifier IC3, and the 1 of operational amplifier IC3
Pin is connected to 2 pin of operational amplifier IC3 by R15, and 5 pin that 1 pin of operational amplifier IC3 is connected to operational amplifier IC3 are adopted
6 pin of sample VR, operational amplifier IC3 flow end and connect with the negative electrode PR of D3, and 7 pin of operational amplifier IC3 are with diode D3's
Anode connects.
Further, diode D3 is connected using multiple diode D3 serial or parallel connections with silicon diode and germanium diode
Or it is in parallel.
Stream regulation circuit by operational amplifier IC4, triode T1, resistance R10, resistance R11, resistance R12, resistance R19,
Electric capacity C7 and electric capacity C5 is constituted；8 pin of operational amplifier IC4 connect power supply, the 4 pin ground connection of operational amplifier IC4, the input of 3 pin
Just, 1 pin output, just, the input of 6 pin is negative for the 5 pin input of operational amplifier IC4, and the output of 7 pin does not connect, empty pin.Flow sample circuit
The 5 pin sampling VR of operational amplifier IC3 is connected to 2 pin of operational amplifier IC4, and stream sample circuit PR flows end and is connected to fortune
Calculate 3 pin of amplifier IC4 and export, 1 pin of operational amplifier IC4 is connected to the output of triode T1 base stages, operational amplifier IC4
1 pin output voltage to resistance R10, resistance R10 connects with resistance R11, and resistance R11 connects with the C poles of triode T1, three poles
The E poles connecting resistance R12 of pipe T1, is grounded by resistance R12；Resistance R19 is corresponding with the two ends of circuit after electric capacity C7 series connection to be connected to electricity
The two ends of resistance R10 and resistance R11 series circuits, resistance R10, resistance R19 output voltage+Vo, electric capacity C5 two ends are connected to triode
C, E the two poles of the earth of T1.
Sampling feedback circuit is by resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance
R13, electric capacity C3, electric capacity C4, photoelectrical coupler IC1 and programmable precision voltage reference TL431IC2 composition；Output voltage+Vo connects
Connecting resistance R3, electric capacity C3 and resistance R8, the corresponding resistance R3 two ends that are connected in two ends after electric capacity C3 and resistance R4 series connection are to resistance
R3 is filtered, and resistance R3 is connected with photoelectrical coupler IC1, and resistance R5 is connected to the shunting of photoelectrical coupler IC1 two ends, photoelectrical coupler
IC1 is connected to the negative pole of programmable precision voltage reference TL431IC2, and the positive pole of programmable precision voltage reference TL431IC2 connects
Ground, resistance R6 and electric capacity C4 connect, another negative poles for terminating to programmable precision voltage reference TL431IC2 of resistance R6, electric capacity C4
Another reference edge for terminating to programmable precision voltage reference TL431IC2, composition resistance-capacitance network is realized to programmable precision voltage
The phase compensation of benchmark TL431IC2, resistance R7 is connected with resistance R9 and resistance R13 realizes the adjustable of output voltage respectively, its
In, resistance R8 and resistance R9 is connected in series to the upper inclined resistance of the benchmark Vref composition debugging voltages of resistance R7, and resistance R13 passes through
The lower inclined resistance of the benchmark Vref composition debugging voltages of resistance R7, the other end of resistance R7 connects with the electric capacity C4 other ends.
A kind of method for being applied to high power switching power supply parallel current-sharing using above-mentioned circuit, specifically includes following steps：
When single power module runs, transformer is changed prime voltage conversion to rear class by energy, by sampling feedback circuit
Voltage needed for obtaining power module, stream regulation circuit and stream sample circuit do not work；And when multiple power modules are in parallel
When, flow sample circuit and collect required voltage, by the comparing of multiple power module voltages, will flow sampled voltage offer
To stream regulation circuit, stream adjusts circuit by adjusting the resistance of sampling feedback circuit, output voltage is adjusted, so as to change electricity
The output current of source module, realizes that power module flows.
Wherein, stream sample circuit converts electrical current into voltage, while being carried out in real time in the sampled voltage to power module
Monitoring, by the voltage on sampling resistor according to needed for power output, amplifies 10~100 times, needs regulation to adopt according to power module
Sample voltage, is exported by diode D3 and flows end to PR.
Stream regulation circuit is compared the voltage that sampling comes by operational amplifier IC4, is controlled by operational amplifier IC4
The break-make of triode T1, adjusting resistance value changes output voltage, and then regulation power supply module output current；If single electricity
Source module, stream regulation circuit do not work, if multiple power modules are in parallel, due to flowing end PR than sampling end VR voltages
Low 0.25V ~ 1V, needs to adjust the quantity that diode D3 connects according to power module, changes error precision, and multiple power modules are simultaneously
Connection, flows end PR and connects together, and what stream end PR was received is a maximum power module voltage of output current, if electric
Pressure exceedes the voltage of setting, and triode T1 conductings make the resistance R8 of resistance R10, resistance R11, resistance R12 and sampling feedback circuit
It is in parallel with R9, other power module voltages are reduced, increase output current, make the electric current of each power module in setting error range
Within.
Sampling feedback circuit is Switching Power Supply common circuit, from programmable precision voltage reference TL431BQ types, by adjusting
Whole resistance R6, resistance R7 and electric capacity C4 adjustment power module gain and bandwidth, make the error of benchmark be reduced to ± 0.48%.
The beneficial effects of the invention are as follows：1st, present invention reduces equal stream error, fiducial error from ± 1.5% reduces to ±
0.48%, the precision of multiple power module parallel current-sharings is improve, closed-loop bandwidth and gain are improved, improve power supply mould
The reliability of block, stability, transient response etc..Flexible multiplication factor of the invention and relatively more free error scaling, different work(
When rate power module is in parallel, such as the power module parallel current-sharing of 100W and 200W, 60 times of the Current amplifier of 100W, and by 200W
30 times of Current amplifier, by comparing, adjust output voltage, under same error, band carry all 50%, give different electrical power mould
The parallel connection of block provides convenient.The present invention can be applied in the parallel system of multiple high power switching power supply modules, it is also possible to
It is applied in single power module.The present invention has can make multiple large power supply wired in parallel, and parallel current-sharing precision is higher,
Simple in circuits is convenient, heat balance when multiple power modules are in parallel, it is ensured that the operation of multiple power module normal reliables.
The present invention flows sample circuit：Stream sample circuit function is to convert electrical current into voltage, while to power supply mould
The sampled voltage of block carries out monitor in real time, flows sample circuit and sees Fig. 2, and current sampling resistor R18 one end is connected to transformer
Negative terminal, one end is connected to ground, and resistance R16 is connected to 2 pin of operational amplifier IC3（Input is negative）, resistance R17 is connected to operational amplifier
3 pin of IC3（Input is just）, 1 pin of operational amplifier IC3（Output）It is connected to operational amplifier IC3's by resistance R15 negative-feedbacks
2 pin, by the voltage on current sampling resistor R18 according to needed for power output, amplify 10~100 times, according to power module needs
Sampled voltage can be flexibly adjusted, while by 1 pin of operational amplifier IC3（Output）It is connected to 5 pin of operational amplifier IC3
（Input is just）, exported by diode D3 and flow end to PR.Wherein, electric capacity C6 and resistance R14 forms a filter network, filters
Noise and spine on sampling resistor, make the operation of the relatively reliable stabilization of power module.The present invention is adopted using operational amplifier IC3
The voltage of collection, be free to adjust multiplication factor, by adjusting diode D3 quantity, be free to adjust equal stream error.
The present invention can adjust error precision using multiple diode D3 series connection, according to the difference of error, with silicon diode and the pole of germanium two
Pipe is connected, or silicon diode and germanium diode are used in mixed way.
3. the present invention flows regulation circuit：Multiple power modules are in parallel, flow end PR and connect together, and flow end PR defeated
What is gone out is a maximum voltage for power module of output current, the voltage operational amplifier that stream regulation circuit carrys out sampling
The 2 pin sampling VR of IC4 flows end PR and compares with 3 pin of operational amplifier IC4, and triode is controlled by operational amplifier IC4
Break-make, adjusting resistance value changes output voltage, so as to realize the purpose of regulation power supply module output current, makes each power supply
The electric current of module is within setting error range.R19 and C7 composition filter networks, C5 electric capacity can adjust current-sharing power supply module and cut
The time changed, suppress noise etc..Using operational amplifier IC4 comparison voltages, by resistance R10, resistance R11, resistance R12, three
The output voltage of pole pipe T1 and electric capacity C5 regulation power supply modules, realizes the purpose that power module flows.
4. sampling feedback circuit of the present invention is Switching Power Supply common circuit, with good closed-loop bandwidth and gain, is selected
High-precision TL431BQ types do reference voltage, reduce the output voltage error of power module, and the error for making benchmark is reduced to ±
0.48%, fiducial error is greatly reduced, reduction can adjust power module gain and bandwidth by adjusting R6, R7 and C4, make electricity
Source module is operated in the more sufficient state of an allowance.Using the closed-loop of TL431, loop bandwidth is improved, increase loop
Allowance, improves the transient response of power module, increases the stability of power module.
Brief description of the drawings
Fig. 1 rear class sharing control schematic diagrams of the invention；
Fig. 2 are of the invention to flow sample circuit figure；
Fig. 3 stream regulation circuit diagrams of the invention；
Fig. 4 sampling feedback circuit figures of the invention.
Specific embodiment
Circuit of the invention is described in detail below：
Circuit of the invention is specific as follows：As shown in figure 1, a kind of circuit suitable for high power switching power supply parallel current-sharing, bag
Include transformer, transformer prime is conventional active pincers or double normal shocks, transformer rear class is by rectifying tube, inductance, output capacitance,
Stream sample circuit, stream regulation circuit, sampling feedback circuit composition；Transformer B1 one end respectively with rectifying tube D1 anodes and electricity
One end connection of R1 is hindered, the resistance R1 other ends are connected with one end of electric capacity C1, and the negative electrode of rectifying tube D1 is cloudy with rectifying tube D2 respectively
One end connection of pole, resistance R2, the other end of electric capacity C1 and inductance L1, the other end of inductance L1 respectively with electric capacity CN1 one end,
Sampling feedback circuit one end and stream regulation circuit on one side connection, the electric capacity CN1 other ends connect with the sampling feedback circuit other end
The other end of transformer is returned to afterwards, and stream regulation circuit returns to the other end of transformer, resistance after being connected with stream sample circuit
R2 connects with the anode of rectifying tube D2 after being connected with electric capacity C2 and returns to the other end of transformer, completes loop.Wherein, resistance R1,
Electric capacity C1 is to be added in rectifying tube D1, and resistance R2, electric capacity C2 are the resistance-capacitance networks being added on rectifying tube D2, and the voltage after rectification is connected
Inductance L1, inductance L1 and electric capacity CN1 connection are connected to the voltage filter after rectification.
As shown in Fig. 2 stream sample circuit is by operational amplifier IC3, diode D3, resistance R14, resistance R15, resistance
R16, resistance R17, current sampling resistor R18 and electric capacity C6 composition；Transformer respectively with current sampling resistor R18 one end, resistance
R16 one end connects, and the current sampling resistor R18 other ends 4 pin respectively with IC3 operational amplifiers, one end of resistance R17 connect,
Another 3 pin for terminating to operational amplifier IC3 of resistance R17, the 4 pin ground connection of IC3 operational amplifiers, wherein, operational amplifier IC3
8 pin connect power supply, 1,2,3 pin of operational amplifier IC3 are one group, and 1 pin output, 2 pin input is negative, and 3 pin are input into just, computing
5,6,7 pin of amplifier IC3 are another group, and 5 pin are input into just, and the input of 6 pin is negative, the output of 7 pin, the resistance R16 other ends respectively with fortune
Calculate 2 pin of amplifier IC3, electric capacity C6 to connect, electric capacity C6 connects after being connected with resistance R14 with 1 pin of operational amplifier IC3, transport
1 pin for calculating amplifier IC3 is connected to 2 pin of operational amplifier IC3 by R15, and 1 pin of operational amplifier IC3 is connected to computing and puts
The 5 pin sampling VR of big device IC3,6 pin of operational amplifier IC3 flow end and connect with the negative electrode PR of D3, and the 7 of operational amplifier IC3
Pin connects with the anode of diode D3.Wherein, the voltage on current sampling resistor R18 is according to needed for power output, amplify 10~
100 times.Electric capacity C6 and resistance R14 forms a filtering bandwidth network, filters the noise and spine on current sampling resistor R18.
Diode D3 can adjust error precision using multiple diode D3 serial or parallel connections, preferably with silicon diode and germanium diode string
Connection is in parallel.
In Fig. 2 sampling functions also can be flowed using two operational amplifiers.If using two single channel operational amplifiers, i.e.,
The 2 pin input that resistance R16 is connected to single operational amplifier is negative, and resistance R17 is being connected to the 3 pin input of single operational amplifier just, single computing
The 1 pin output of amplifier is connected to 2 pin and is input into negative, the 4 pin ground connection of single operational amplifier, the 8 of single operational amplifier by resistance R15
Pin is powered, and 1 pin of single operational amplifier is connected to 3 pin of another single operational amplifier, and the 2 pin input of single operational amplifier is negative to be connect
To the negative electrode of diode D3, the 1 pin input of single operational amplifier is just being connected to the anode of diode D3,4 pin of single operational amplifier
Ground connection, 8 pin of single operational amplifier are powered.
As shown in figure 3, stream regulation circuit is by operational amplifier IC4, triode T1, resistance R10, resistance R11, resistance
R12, resistance R19, electric capacity C7 and electric capacity C5 composition；8 pin of operational amplifier IC4 connect power supply, and 4 pin of operational amplifier IC4 connect
Ground, 3 pin are input into just, the output of 1 pin, and just, the input of 6 pin is negative for the 5 pin input of operational amplifier IC4, and the output of 7 pin does not connect, empty pin.
The 5 pin sampling VR of stream sample circuit operational amplifier IC3 is connected to 2 pin of operational amplifier IC4, flows sample circuit PR equal
Stream end is connected to 3 pin of operational amplifier IC4 and exports, and 1 pin of operational amplifier IC4 is connected to the output of triode T1 base stages, fortune
The 1 pin output voltage of amplifier IC4 to resistance R10 is calculated, resistance R10 connects with resistance R11, the C of resistance R11 and triode T1
Pole connects, the E poles connecting resistance R12 of triode T1, is grounded by resistance R12；The two ends of circuit after resistance R19 and electric capacity C7 series connection
Correspondence is connected to the two ends of resistance R10 and resistance R11 series circuits, and the ends of electric capacity C5 two are connected to C, E the two poles of the earth of triode T1；Resistance
R10, resistance R19 output voltages+Vo.Wherein, after resistance R19 and electric capacity C7 series connection the two ends of circuit it is corresponding be connected to resistance R10 with
The two ends of resistance R11 series circuits, constitute resistance-capacitance network, filtering clutter, and C, E two-stage regulation that electric capacity C5 is connected to triode T1 ring
With suppression noise between seasonable.
As shown in figure 4, sampling feedback circuit is by resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, electricity
Resistance R9, resistance R13, electric capacity C3, electric capacity C4, photoelectrical coupler IC1 and programmable precision voltage reference TL431IC2 compositions；Output
Two ends after voltage+Vo connections resistance R3, electric capacity C3 and resistance R8, electric capacity C3 and resistance R4 series connection are corresponding to be connected to resistance R3 two
End filters to resistance R3, and resistance R3 is connected with photoelectrical coupler IC1, and resistance R5 is connected to the shunting of photoelectrical coupler IC1 two ends, light
Electric coupler IC1 is connected to the negative pole of programmable precision voltage reference TL431IC2, programmable precision voltage reference TL431IC2
Plus earth, resistance R6 and electric capacity C4 connect, and resistance R6 is another to terminate to the negative of programmable precision voltage reference TL431IC2
Pole, another reference edges for terminating to programmable precision voltage reference TL431IC2 of electric capacity C4, composition resistance-capacitance network realization pair can be compiled
The phase compensation of journey standard of precision voltage TL431IC2, resistance R7 is connected and realizes output voltage with resistance R9 and resistance R13 respectively
It is adjustable, wherein, resistance R8 and resistance R9 be connected in series to resistance R7 benchmark Vref composition debugging voltage upper inclined resistance, electricity
Resistance R13 is made up of the lower inclined resistance of debugging voltage, the other end and the electric capacity C4 other ends of resistance R7 the benchmark Vref of resistance R7
Connect.
A kind of method for being applied to high power switching power supply parallel current-sharing using above-mentioned circuit, specifically includes following steps：
When single power module runs, transformer is changed prime voltage conversion to rear class by energy, by sampling feedback circuit
Voltage needed for obtaining power module, stream regulation circuit and stream sample circuit do not work；And when multiple power modules are in parallel
When, the stream end PR of multiple power modules is connected together, flow sample circuit and collect required voltage, by multiple electricity
The comparing of source module voltage, flows a maximum power module voltage of end PR output currents, and stream sampled voltage is supplied to
Stream regulation circuit, flows regulation circuit by adjusting the resistance of sampling feedback circuit, output voltage is adjusted, so as to change power supply
The output current of module, realizes that power module flows.
Wherein, stream sample circuit converts electrical current into voltage, while being carried out in real time in the sampled voltage to power module
Monitoring, by the voltage on sampling resistor according to needed for power output, amplifies 10~100 times, needs regulation to adopt according to power module
Sample voltage, is exported by diode D3 and flows end to PR.
Stream regulation circuit is compared the voltage that sampling comes by operational amplifier IC4, is controlled by operational amplifier IC4
The break-make of triode T1, adjusting resistance value changes output voltage, so as to realize the purpose of regulation power supply module output current；
If single power module, stream regulation circuit does not work, if multiple power modules are in parallel, due to flowing end PR ratios
Low 0.25V ~ the 1V of sampling end VR voltages, needs to adjust the quantity that diode D3 connects according to power module, changes error precision,
What stream end PR was received is a maximum power module voltage of output current, if voltage exceedes the voltage of setting, triode
T1 is turned on, and makes the resistance R8 and R9 of resistance R10, resistance R11, resistance R12 and sampling feedback circuit in parallel, reduces power module electricity
Pressure, increases output current, the electric current of each power supply power module is being set within error range.
Sampling feedback circuit is Switching Power Supply common circuit, from programmable precision voltage reference TL431BQ types, by adjusting
Whole resistance R6, resistance R7 and electric capacity C4 adjustment power module gain and bandwidth, make the error of benchmark be reduced to ± 0.48%.
Embodiment 1
When power module 1 and power module 2 in parallel, the stream end PR of two power modules is connected together, two power supplys
Module is sampled to respective current sampling resistor R18, and the electric current that will be sampled is converted to electricity by operational amplifier IC3
The voltage that stream end PR is arrived in the output of pressure, such as power module 1 is 0.72V, and the output of power module 2 is to the voltage of stream end PR
0.78V, flows a maximum power module voltage of end PR output currents, due to flowing 6 pin of end PR and operational amplifier IC3
3 pin with operational amplifier IC4 are connected, and the 3 pin voltages of the operational amplifier IC4 of input power module 1 are lifted into 0.78V, this
2 pin of the operational amplifier IC4 of power module 1 when individual（Input is negative）The 3 of the voltage 0.72V and operational amplifier IC4 of power module 2
Pin（Input is just）0.78V compares, and makes 1 pin of the operational amplifier IC4 of power module 1（Output）+ Vo is output as, triode T1 leads
It is logical, the output voltage of power module 1 is reduced, increase the output current of power module 1, reduce the output current of power module 2, and
When the output current of power module 1 is more than power module 2, the triode T1 cut-offs of power module 1, three poles of power module 2
Pipe T1 is turned on, and increases the output current of power module 2, reduces the output current of power module 1, according to two power module electric currents
Size alternate conduction, realize the purpose that two power modules flow.
Claims (9)
1. a kind of circuit suitable for high power switching power supply parallel current-sharing, including transformer, transformer prime is conventional have
Clamp or double normal shocks in source, it is characterised in that：Transformer rear class is adjusted by rectifying tube, inductance, output capacitance, stream sample circuit, stream
Economize on electricity road, sampling feedback circuit composition；Transformer B1 one end is connected with rectifying tube D1 anodes, resistance R1 one end respectively, resistance R1
The other end is connected with one end of electric capacity C1, the negative electrode of rectifying tube D1 respectively with rectifying tube D2 negative electrodes, resistance R2, electric capacity C1 it is another
One end connection of end and inductance L1, the other end of inductance L1 respectively with electric capacity CN1 one end, sampling feedback circuit one end and flow
Regulation circuit on one side connection, the electric capacity CN1 other ends return to the other end of transformer after connecting with the sampling feedback circuit other end,
Stream regulation circuit returns to the other end of transformer after being connected with stream sample circuit, resistance R2 connected with electric capacity C2 after with rectifying tube
The anode of D2 connects and returns to the other end of transformer, completes loop.
2. a kind of circuit suitable for high power switching power supply parallel current-sharing as claimed in claim 1, it is characterised in that：Flow
Sample circuit is by operational amplifier IC3, diode D3, resistance R14, resistance R15, resistance R16, resistance R17, current sampling resistor
R18 and electric capacity C6 is constituted；Transformer is connected with current sampling resistor R18 one end, resistance R16 one end respectively, current sampling resistor
The R18 other ends 4 pin respectively with IC3 operational amplifiers, one end of resistance R17 connect, and resistance R17 is another to terminate to operation amplifier
3 pin of device IC3, the 4 pin ground connection of IC3 operational amplifiers, wherein, 8 pin of operational amplifier IC3 connect power supply, operational amplifier IC3
1,2,3 pin be one group, 1 pin output, 2 pin input is negative, and 3 pin are input into just, and 5,6,7 pin of operational amplifier IC3 are another
Group, 5 pin are input into just, and the input of 6 pin is negative, the output of 7 pin, the resistance R16 other ends 2 pin, electric capacity C6 phases respectively with operational amplifier IC3
Connect, electric capacity C6 connects after being connected with resistance R14 with 1 pin of operational amplifier IC3, and 1 pin of operational amplifier IC3 is connect by R15
To 2 pin of operational amplifier IC3,1 pin of operational amplifier IC3 is connected to the 5 pin sampling VR of operational amplifier IC3, and computing is put
6 pin of big device IC3 flow end and connect with the negative electrode PR of D3, and 7 pin of operational amplifier IC3 connect with the anode of diode D3.
3. a kind of circuit suitable for high power switching power supply parallel current-sharing as claimed in claim 2, it is characterised in that：Two poles
Pipe D3 uses multiple diode D3 serial or parallel connections, with silicon diode and germanium diode serial or parallel connection.
4. a kind of circuit suitable for high power switching power supply parallel current-sharing as claimed in claim 1, it is characterised in that：Flow
Regulation circuit is by operational amplifier IC4, triode T1, resistance R10, resistance R11, resistance R12, resistance R19, electric capacity C7 and electric capacity
C5 is constituted；8 pin of operational amplifier IC4 connect power supply, and the 4 pin ground connection of operational amplifier IC4,3 pin are input into just, the output of 1 pin, fortune
Calculate the 5 pin input of amplifier IC4 just, the input of 6 pin is negative, the output of 7 pin does not connect, empty pin；Stream sample circuit operational amplifier IC3
5 pin sampling VR be connected to 2 pin of operational amplifier IC4, flow sample circuit PR and flow end and be connected to operational amplifier IC4's
3 pin are simultaneously exported, and 1 pin of operational amplifier IC4 is connected to the output of triode T1 base stages, the 1 pin output voltage of operational amplifier IC4
To resistance R10, resistance R10 connects with resistance R11, and resistance R11 connects with the C poles of triode T1, the E poles connecting resistance of triode T1
R12, is grounded by resistance R12；Resistance R19 be connected to resistance R10s and resistance R11 corresponding with the two ends of circuit after electric capacity C7 series connection goes here and there
The two ends on line road, resistance R10, resistance R19 output voltage+Vo, electric capacity C5 two ends are connected to C, E the two poles of the earth of triode T1.
5. a kind of circuit suitable for high power switching power supply parallel current-sharing as claimed in claim 1, it is characterised in that：Sampling
Feedback circuit is by resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R13, electric capacity C3, electricity
Hold C4, photoelectrical coupler IC1 and programmable precision voltage reference TL431IC2 composition；Output voltage+Vo connection resistance R3, electric capacity
C3 and resistance R8, electric capacity C3 and resistance R4 series connection after two ends it is corresponding be connected to resistance R3 two ends to resistance R3 filtering, resistance R3
It is connected with photoelectrical coupler IC1, resistance R5 is connected to the shunting of photoelectrical coupler IC1 two ends, and photoelectrical coupler IC1 is connected to can be compiled
The negative pole of journey standard of precision voltage TL431IC2, the plus earth of programmable precision voltage reference TL431IC2, resistance R6 and electricity
Hold C4 to connect, another negative poles for terminating to programmable precision voltage reference TL431IC2 of resistance R6, another terminating to of electric capacity C4 can
The reference edge of programming standard of precision voltage TL431IC2, composition resistance-capacitance network is realized to programmable precision voltage reference TL431IC2
Phase compensation, resistance R7 is connected with resistance R9 and resistance R13 realizes the adjustable of output voltage respectively, wherein, resistance R8 and electricity
Resistance R9 is connected in series to the upper inclined resistance of the benchmark Vref composition debugging voltages of resistance R7, the benchmark that resistance R13 passes through resistance R7
The lower inclined resistance of Vref composition debugging voltages, the other end of resistance R7 connects with the electric capacity C4 other ends.
6. a kind of method that use circuit as described in claim any one of 1-5 is applied to high power switching power supply parallel current-sharing,
It is characterized in that：Specifically include following steps：When single power module runs, transformer is changed preceding step voltage by energy
Rear class is transformed into, the voltage needed for obtaining power module by sampling feedback circuit, stream adjust circuit and flows sample circuit
Do not work；And when multiple power modules are in parallel, flowing sample circuit collects required voltage, by multiple power modules electricity
The comparing of pressure, stream regulation circuit is supplied to by stream sampled voltage, and stream regulation circuit is by adjusting sampling feedback circuit
Resistance, adjusts output voltage, so as to change the output current of power module, reaches the purpose that multiple power modules flow.
7. a kind of method suitable for high power switching power supply parallel current-sharing as claimed in claim 6, it is characterised in that：Flow
Sample circuit converts electrical current into voltage, while monitor in real time is carried out in the sampled voltage to power module, by sampling resistor
Voltage output power needed for amplify 10~100 times, according to power module need adjust sampled voltage, exported by diode D3
End is flowed to PR.
8. a kind of method suitable for high power switching power supply parallel current-sharing as claimed in claim 6, it is characterised in that：Flow
Regulation circuit is compared the voltage that sampling comes by operational amplifier IC4, and leading to for triode T1 is controlled by operational amplifier IC4
Disconnected, adjusting resistance value changes output voltage, and then regulation power supply module output current；If single power module, stream is adjusted
Economize on electricity road does not work, if multiple power modules are in parallel, due to flowing end PR than the sampling end low 0.25V ~ 1V of VR voltages, root
Need to adjust the quantity that diode D3 connects according to power module, change error precision, when multiple power modules are in parallel, flow end PR
Link together, the voltage that stream end PR is received is a maximum power module voltage of output current, if voltage exceedes
The voltage of setting, triode T1 conductings, makes the resistance R8 and R9 of resistance R10, resistance R11, resistance R12 and sampling feedback circuit simultaneously
Connection, reduces other power module voltages, increases output current, make the electric current of each power module setting error range it
It is interior.
9. as claimed in claim 7 or 8 a kind of method suitable for high power switching power supply parallel current-sharing, it is characterised in that：
Sampling feedback circuit is Switching Power Supply common circuit, from programmable precision voltage reference TL431BQ types, by adjusting resistance
R6, resistance R7 and electric capacity C4 adjustment power module gain and bandwidth, make the error of benchmark be reduced to ± 0.48%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285592A (en) * | 2021-07-22 | 2021-08-20 | 七四九(南京)电子研究院有限公司 | Current-sharing control circuit applied to primary side of module power supply |
| CN114567178A (en) * | 2022-02-28 | 2022-05-31 | 西安微电子技术研究所 | Current transformer-based multi-module parallel current-sharing line of DC/DC converter |
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| CN202085085U (en) * | 2011-06-17 | 2011-12-21 | 湖南大学 | Large power efficient energy-consuming high frequency switch power supply |
| CN103199694A (en) * | 2013-03-27 | 2013-07-10 | 北京工业大学 | Switching power supply with automatic current sharing function |
| CN204244079U (en) * | 2014-09-10 | 2015-04-01 | 广州优联电气科技有限公司 | Modular power source primary side parallel current-equalizing circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202085085U (en) * | 2011-06-17 | 2011-12-21 | 湖南大学 | Large power efficient energy-consuming high frequency switch power supply |
| CN103199694A (en) * | 2013-03-27 | 2013-07-10 | 北京工业大学 | Switching power supply with automatic current sharing function |
| CN204244079U (en) * | 2014-09-10 | 2015-04-01 | 广州优联电气科技有限公司 | Modular power source primary side parallel current-equalizing circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285592A (en) * | 2021-07-22 | 2021-08-20 | 七四九(南京)电子研究院有限公司 | Current-sharing control circuit applied to primary side of module power supply |
| CN113285592B (en) * | 2021-07-22 | 2021-10-29 | 七四九(南京)电子研究院有限公司 | Current-sharing control circuit applied to primary side of module power supply |
| CN114567178A (en) * | 2022-02-28 | 2022-05-31 | 西安微电子技术研究所 | Current transformer-based multi-module parallel current-sharing line of DC/DC converter |
| CN114567178B (en) * | 2022-02-28 | 2024-05-07 | 西安微电子技术研究所 | DC/DC converter multi-module parallel current equalizing circuit based on current transformer |
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| CN106787629B (en) | 2019-09-20 |
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