CN106452068A - DC/DC converter input-series output-series voltage equalizing control method - Google Patents
DC/DC converter input-series output-series voltage equalizing control method Download PDFInfo
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- CN106452068A CN106452068A CN201610899996.3A CN201610899996A CN106452068A CN 106452068 A CN106452068 A CN 106452068A CN 201610899996 A CN201610899996 A CN 201610899996A CN 106452068 A CN106452068 A CN 106452068A
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- voltage
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a DC/DC converter input-series output-series voltage-sharing control method. Each DC/DC converter is an output-end voltage-stabilization power module. The input end of each power module is connected in parallel with an MOSFET and a filter capacitor. Meanwhile, each power module has an input voltage equalizing ring; the reference voltage of each equalizing ring is average value vin/N of the total input voltage, N being the number of the power modules; and offset voltages generated by the voltage equalizing rings directly control the MOSFET to work in a linear region and adjust average operation of the N modules. The method can quickly enable the market voltage-stabilization power modules to be combined in an input-series output-series manner, and realizes random combination according to different voltage demands. Compared with the conventional voltage equalizing control method, the method avoids tedious repeated calculating process, and is easy to realize; and the control object of each voltage equalizing ring is the MOSFET working in the linear region, bandwidth can be very high, and the good dynamic response is achieved.
Description
Technical field
The present invention relates to a kind of control method of DC/DC converter, more particularly, to a kind of DC/DC converter input is connected defeated
Go out the pressure equalizing control method of series connection.
Background technology
The system that input series connection output series connection (ISOS) connects is capable of the power that input and output side is all high pressure and becomes
Change, the voltage x current stress of single module declines at double, solve the problems, such as to be difficult to type selecting because of the high device of electric pressure.For ISOS even
The mode connecing, all presses purpose for reaching system, and existing control method mainly has same Duty ratio control method, three close-loop control side
Method, cross-over control method, control method of no center control device etc..
Wherein simple with Duty ratio control, can naturally all be pressed using topological property；Three close-loop control method all pressures dynamic
Step response is best with steady-state characteristic, but circuit structure complexity is difficult to realize；Cross-over control method can be realized all pressing from output end
Control, eliminate the isolation being input to output end；And the control method of no center control device can fully achieve modularization, own
Converter direct ISOS connection can achieve all presses.
Summarize the feature of existing several typical control methods, find these control methods in each power conversion requirement
Under, it is required for recalculating topological parameter, design the compensating parameter of several loops simultaneously, typically have output-voltage loop, interior electric current
Ring, grading ring etc..And generally each topological small-signal modeling and loop compensation calculating are all complex.When output voltage and
When current needs change, said process will be repeated, not only loaded down with trivial details but also increased the R＆D cycle.And these control methods
The bandwidth on the grading ring road of middle proposition, typically all without very high, also makes the dynamic output characteristic and all of whole connection in series-parallel combined system
Pressure characteristic is not ideal enough.
Content of the invention
It is an object of the invention to provide a kind of DC/DC converter constant as output voltage carries out input series connection even
Connect the pressure equalizing control method that output end is connected in series, ensure that in the system after composition mean allocation between each sub- converter
Input voltage and output voltage.
For reaching above-mentioned purpose, the present invention is achieved through the following technical solutions：
A kind of pressure equalizing control method of DC/DC converter input series connection output series connection, methods described includes：Described DC/DC
Converter is the power module of output end voltage stabilizing, input one MOSFET and filtered electrical of parallel connection of each power module
Hold；After the input series connection of each power module, reconnect total input voltage Vin；After the output end series connection of each power module,
Reconnect load resistance Rload；Meanwhile, each power module has an input grading ring, and the input voltage of grading ring is power supply
The input voltage of module, the reference voltage of grading ring is the mean value v of total input voltagein/ N, N are the number of power module；All
Offset voltage V that pressure ring producesg1, Vg2Directly control MOSFET to be operated in linear zone, adjust the average operation of N number of module.
Further, each grading ring is operationally that positive feedback runs, and that is, reference voltage inputs from end of oppisite phase, each
The input voltage of module inputs from in-phase end.
Further, the efficiency of described DC/DC converter should be as far as possible close.
Further, DC/DC converter is equivalent to a negative impedance, and the value of described negative impedance is according to power output and input
Voltage calculates, as long as the DC/DC converter with the constant characteristic of output voltage all can be extended using methods described.
Further, methods described only needs, according to modelling grading ring compensator, do not have additionally loaded down with trivial details meter
Calculation process.
Further, methods described be applied to communication, medical treatment, in the power supply of spacecraft.
The invention has the beneficial effects as follows：Commercially available power module of voltage regulation can quickly be inputted by the control method of the present invention
Series connection output tandem compound gets up.Each module input one MOSFET of parallel connection, controls each MOSFET work by grading ring
Make in linear zone, realize modules and averagely run.The method of the present invention can be pressed using commercially available power module as a device
Arbitrarily it is combined according to different voltage requirements.Relatively more traditional pressure equalizing control method, the method for the present invention saves loaded down with trivial details weight
The multiple process calculating, method is simply easily achieved.And the control object of grading ring is to be operated in the MOSFET of linear zone, bandwidth
Can accomplish very high, there is preferable dynamic response.
Brief description
Fig. 1 is the schematic diagram of the pressure equalizing control method of the present invention；
Fig. 2 is the small-signal model schematic diagram of the ISOS system of two module compositions；
Fig. 3 is the control block diagram of the pressure equalizing control method of the present invention.
Specific embodiments
Combine accompanying drawing below by specific embodiment the present invention is described in further detail.
For a specific power conversion occasion, pressure equalizing control method proposed by the present invention, can Rapid Combination have
Power module.By one group same or different commercially available output voltage stabilizing DC/DC converter (or a voltage-stabilizing system) with
Meaning carries out ISOS combination, meets required voltage conversion.Using power module as a power device, need to meet according to output end
Dynamic indicator, efficiency index chosen, topology need not be built and repeatedly debug output characteristics.Substantially reduce ISOS system
Construction cycle.
Pressure equalizing control method principle schematic proposed by the present invention is as shown in Figure 1.In accompanying drawing 1, DC/DC converter is defeated
Go out to hold the power module of voltage stabilizing, input one MOSFET and filter capacitor of parallel connection of each power module.Each power supply
After the input series connection of module, reconnect total input voltage Vin；After the output end series connection of each power module, reconnect load electricity
Resistance Rload.Each power module has an input grading ring simultaneously, and the input voltage of grading ring is vin1(vin2), grading ring
Reference voltage is the mean value v of total input voltagein/ N, N are the number of power module.Offset voltage V that grading ring producesg1, Vg2
MOSFET is directly controlled to be operated in linear zone, the average operation of two modules of adjustment.Wherein, each grading ring is just operationally
Back-to-back running.Namely, from end of oppisite phase, the input voltage of each module of sampling is in in-phase end for reference voltage.This is because
There is anti-phase function in the main topology of grading ring, anti-phase link in control loop, need not have been added again, that is, constituted negative-feedback.?
It is exactly driving voltage Vg1Higher, Vin1Less, because driving voltage is higher, the upper electric current of MOSFET is bigger, and total input current is constant,
So on electric capacity, electric current is less, and input voltage is reduced by.For example, as the input voltage V of module 1in1Increase, control circuit is produced
Raw offset voltage Vg1Increase, then the electric current on MOSFET increases, input capacitance Cin1On electric current reduce, Vin1And then subtract
Little, system returns to stable state.
The steady operation point of analysis system below.Assume that the rated output voltage of the DC/DC converter of buying is equal, output
End is connected in series and makes output current also equal, then the power output of all modules is equal.
Po1=Po2=Po(1)
The error very little of general converter output voltage, so the power output of modules is also several in actual conditions
Equal.The efficiency of module is respectively η1, η2, after converting input, respective input power is different.
And the control inputting grading ring makes the input voltage of all modules equal, it is connected in series and makes input current also equal,
The control of all grading rings is to define the equal P of all module input powers in factin1=Pin2=Pin.And each DC/DC becomes
The difference of parallel operation input power is by by MOSFET adjustment in parallel.So the power on each module input MOSFET during stable state
It is shown below.
PM1=Pin-P1,PM2=Pin-P2(3)
The power consumption of MOSFET must be on the occasion of, so, during closed-loop stabilization, (hypothesis is mould to the minimum DC/DC converter of efficiency
Block 2) convert input power maximum, then Pin=P2.The input MOSFET of module 2 will be not turned on, not loss power.?
The efficiency of whole ISOS system is equal to the minimum module of efficiency in DC/DC converter.So in order to ensure system effectiveness, selected
The efficiency of one group of DC/DC converter should be as far as possible close.
Accompanying drawing 2 is the small-signal model of the ISOS system of two module compositions, DC/DC converter operationally, output end
It is invariable power, therefore the DC/DC converter that each is purchased can be equivalent to the anti-R of negative resistanceneg1,-Rneg2.This negative resistance
Anti- value can be calculated according to power output and input voltage, and the structure of inside modules can be unknown.So, attached
DC/DC converter in Fig. 2 can be the system of module that one group of output voltage differs or a voltage stabilizing, as long as
There is the constant characteristic of output voltage to be all extended using method proposed by the present invention.The corresponding ginseng inputting grading ring
Examine voltage to be also changed according to corresponding power output.The control method so proposing only needs according to modelling grading ring
Compensator, does not have additionally loaded down with trivial details calculating process.
Accompanying drawing 3 is the control block diagram of the pressure equalizing control method of the present invention, and the reference voltage of each module grading ring is input
The mean value of voltage, the control block diagram of the ISOS system of two such module composition can be reduced to the form of accompanying drawing 2, that is,
The difference of two input voltages is compared with reference voltage 0, and after compensation, the driving voltage of output controls two inputs parallel connections respectively
MOSFET.
The present invention can be applicable in the systems such as communication, medical treatment, spacecraft power supply, becomes as the constant DC/DC of output voltage
Parallel operation carries out input and is connected in series the pressure equalizing control method that output end is connected in series, and ensure that in the system after composition each
Mean allocation input voltage and output voltage between sub- converter.
Above content is to further describe it is impossible to assert with reference to specific preferred embodiment is made for the present invention
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of present inventive concept, some simple deduction or replace can also be made, all should be considered as belonging to the present invention's
Protection domain.
Claims (6)
1. a kind of DC/DC converter input series connection output series connection pressure equalizing control method it is characterised in that：Methods described includes：
Described DC/DC converter is the power module of output end voltage stabilizing, input parallel connection one MOSFET and of each power module
Individual filter capacitor；After the input series connection of each power module, reconnect total input voltage Vin；The output end of each power module
After series connection, reconnect load resistance Rload；Meanwhile, each power module has an input grading ring, the input electricity of grading ring
Pressure is the input voltage of power module, and the reference voltage of grading ring is the mean value v of total input voltagein/ N, N are power module
Number；Offset voltage V that grading ring producesg1, Vg2Directly control MOSFET to be operated in linear zone, adjust the average fortune of N number of module
OK.
2. method according to claim 1 it is characterised in that：Each grading ring is operationally that positive feedback runs, that is,
Reference voltage inputs from end of oppisite phase, and the input voltage of each module inputs from in-phase end.
3. method according to claim 1 it is characterised in that：The efficiency of described DC/DC converter should be as far as possible close.
4. method according to claim 1 it is characterised in that：DC/DC converter is equivalent to a negative impedance, described negative resistance
Anti- value is calculated according to power output and input voltage, as long as having the DC/DC converter of the constant characteristic of output voltage
All can be extended using methods described.
5. method according to claim 1 it is characterised in that：Methods described only needs to be compensated according to modelling grading ring
Device, does not have additionally loaded down with trivial details calculating process.
6. method according to claim 1 it is characterised in that：Methods described is applied to communication, medical treatment, the power supply of spacecraft
In.
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| CN201610899996.3A CN106452068B (en) | 2016-10-14 | 2016-10-14 | A kind of concatenated pressure equalizing control method of DC/DC converter input series connection output |
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| CN201610899996.3A CN106452068B (en) | 2016-10-14 | 2016-10-14 | A kind of concatenated pressure equalizing control method of DC/DC converter input series connection output |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302073A (en) * | 2018-10-26 | 2019-02-01 | 哈尔滨工业大学（深圳） | A kind of knockdown converter of input tandem type |
| CN109728577A (en) * | 2017-10-27 | 2019-05-07 | 致茂电子(苏州)有限公司 | The control method of power system and power system |
| CN109947161A (en) * | 2017-12-20 | 2019-06-28 | 致茂电子(苏州)有限公司 | The control method of power system and power system |
| CN111817564A (en) * | 2019-04-10 | 2020-10-23 | 西安许继电力电子技术有限公司 | ISOS type DC/DC control method |
| CN113258752A (en) * | 2021-06-07 | 2021-08-13 | 深圳市永联科技股份有限公司 | Dynamic control method and system of circuit signal and power module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728577A (en) * | 2017-10-27 | 2019-05-07 | 致茂电子(苏州)有限公司 | The control method of power system and power system |
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| CN109947161A (en) * | 2017-12-20 | 2019-06-28 | 致茂电子(苏州)有限公司 | The control method of power system and power system |
| CN109302073A (en) * | 2018-10-26 | 2019-02-01 | 哈尔滨工业大学（深圳） | A kind of knockdown converter of input tandem type |
| CN111817564A (en) * | 2019-04-10 | 2020-10-23 | 西安许继电力电子技术有限公司 | ISOS type DC/DC control method |
| CN113258752A (en) * | 2021-06-07 | 2021-08-13 | 深圳市永联科技股份有限公司 | Dynamic control method and system of circuit signal and power module |
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