CN107294391A - A kind of power conversion module and the power-supply system being made up of the power conversion module - Google Patents
A kind of power conversion module and the power-supply system being made up of the power conversion module Download PDFInfo
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- CN107294391A CN107294391A CN201710673576.8A CN201710673576A CN107294391A CN 107294391 A CN107294391 A CN 107294391A CN 201710673576 A CN201710673576 A CN 201710673576A CN 107294391 A CN107294391 A CN 107294391A
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- input
- power conversion
- output
- conversion module
- 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
- H02M3/33569—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 having several active switching elements
-
- 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
- H02M3/33523—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 with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
Abstract
The present invention provides in a kind of power conversion module and the power-supply system being made up of the power conversion module, each power conversion module and devises two rings：One output regulation loop, an input grading ring.Can be by simple external cabling, to realize that the module of not same-action works.So that there is input pressure, the function of output voltage stabilizing by the electrical voltage system that the power conversion module carries out input series connection, output-parallel is constituted.User directly can freely set up system using standard module as desired, portable high using flexible, and requirement of the system to client is low, directly by the input series connection of module, output-parallel, it is not necessary to this professional professional knowledge.
Description
Technical field
Patent of the present invention is related to a kind of power conversion module and power-supply system, more particularly to for high input voltage, modularization
The occasion of application.
Background technology
In the application system of Switching Power Supply, high input voltage occasion, such as photo-voltaic power supply, its general input range is wide and inputs
Voltage is high, and high pressure can reach 1500V even more highs, it is therefore desirable to improve the rated voltage of rear stage converter switches pipe.And it is high
Press MOSFET on state resistance big, cause conduction loss big, and cost is high；Someone, which says, can use IGBT as switching tube,
Though IGBT saturation voltage drops are small, there is current tail phenomenon, limit the raising of switching frequency, be unfavorable for reducing transformer and filter
The volume of wave device (inductance, electric capacity), along with cost factor, hence it is evident that the selection for not being.
In order to solve the problems, such as the high input voltage of photovoltaic Switching Power Supply, some Switching Power Supply producers are just come up with switch electricity
The connection in series-parallel of power device is carried out inside source, required high pressure applications are replaced with multiple low voltage power devices, still
Such standard switch power module limits the selection of user, and general producer all can to reduce the quantity of product type
The input of super wide range is done, causes the cost of product to improve, but is for the customer Redundancy Design.Also someone contemplates
The mentality of designing of combined converter, but be typically all to be realized using complicated external control circuit, system complex and application
Underaction.Therefore, the power supply of client needs can be directly constituted with reference power supply module for power module producer
System is the problem of being worthy of consideration.If it is then the power supply kind that power supply production company is produced can be greatly reduced, it is convenient
The electric power system of its needs of user's designed, designed.
Power-supply system is built with reference power supply module, most basic method is exactly the connection in series-parallel group using input/output
Close.By two identical power modules as an example, by using the series-parallel connection method of input/output, following four are had
Kind power-supply system, which can be combined, to be obtained：
System 1：Input is in parallel, the system of output-parallel；
System 2：Input series connection, the system of output-parallel；
System 3：Input is in parallel, the system for exporting series connection；
System 4：Input series connection, the system for exporting series connection.
In these four systems, what is be widely used is the first system.Typical product has high-power communication power supply
System, high power UPS system etc., three kinds of systems, few using going back in addition.
Each module in system 2, from redundancy requirement, preferably mutually independently, i.e., it is each have by oneself the control of oneself with
Power supply.But modules by single reference power supply, can not make the accurate voltage stabilizing of output voltage, because at that rate, respectively
Electric current of the module after output end is in parallel, can be due to the factory-set value error of module voltage, and causes very big inequality, this
Very big inequality of each module on its input voltage is also led to, so as to influence the reliability of module, or even is damaged.So, one
As can not to accurate voltage stabilizing power module carry out directly input series connection, output-parallel.
In existing conventional topology, normal shock, flyback have just vetoed input series and output parallel system from principle
Feasibility.Input impedance in conventional topology in the small-signal model of Royer circuits is just, to be more adapted to series-parallel system
In, but Royer circuits are used in high-pressure system, the selection of switching tube is more difficult, is not appropriate for the connection in series-parallel system under high pressure
In system.
Switching Power Supply changes feed unit as the energy of other electronic equipments, and its volume also receives much concern with flexibility,
The height that have impact on integral product of such as high-power ultrathin products, the volume of its high tension apparatus and the volume of transformer seriously
Degree.Here there are two kinds of settling modes, a kind of is the connection in series-parallel form using transformer, by power dispersion in several transformers,
The volume of transformer is reduced, so as to reach the purpose for reducing whole Switching Power Supply volume；Another thinking be exactly the string of module simultaneously
Connection, power expansion is carried out by the connection in series-parallel of several small-power modules.But carry out the input of two modules on the market at present
The structure of series connection output-parallel, is required for extra addition flow equalizing circuit outside module, and the outside control so applied is complicated, right
There is certain specialty limitation for client, the normal client of some non-electronics majors can not be realized simply.Or pass through one
A little topologys with positive impedance characteristic, primary side series connection secondary parallel connection is carried out using its peculiar presses naturally.
In the series parallel structure referred in the utility model patent of Application No. 201621402396.3, use out
The asymmetrical half-bridge anti exciting converter switch power module of ring control carries out connection in series-parallel.
It is due to the originals such as load regulation although above-mentioned patent can realize the simple parallel connection of two switch power modules
Cause, the output voltage range of whole system is also bigger than the voltage range of input, it is therefore desirable to add second level voltage-stabilizing system, this
Whole efficiency influence on system is very big.The circuit structure of the utility model patent as shown in Figure 1, Figure 2, Figure 3, Figure 4, wherein scheming
One is the structural representation that two modules directly input series connection output-parallel, and Fig. 2 is that two modules directly input series connection output simultaneously
Join and add the structural representation of Voltage stabilizing module, Fig. 3 is that multiple modules directly input series connection output-parallel structural representation, Fig. 4
Series connection output-parallel is directly inputted for multiple modules and adds the structural representation of Voltage stabilizing module.
First embodiment is using two 60W, input voltage in the utility model patent of Application No. 201621402396.3
Scope for 120VDC~240VDC calibration power modular converter as connection in series-parallel constitute a 120W power-supply system, to its
Input series and output parallel effect under opened loop control has carried out experimental verification.After the deviation for considering opened loop control parameter, module
Input voltage Accuracy extimate can decline, now can by two extreme deviations of control parameter again with power stage parameter two
Extreme deviations are planted, by the size of module gain, a kind of two new extreme modules are combined into.Theoretically, gain it is maximum and
The two minimum modules As of gain and B correspond to following parameters respectively：
The maximum module of gain：Lm(min), Lr(min), Cr(min), Dmac, fs(min)；
The minimum module of gain：Lm(max), Lr(max), Cr(max), Dmin, fs(max)。
By five above-mentioned parameter combinations into following five groups of experiment parameters：
Combination 1：Power stage and control are input series connection/output-parallel experiment of nominal parameters
A module parameters：Lm=145uH, Lr=7uH, Cr=0.27uF, D=0.5, fs=100KHz
B module parameters：Lm=145uH, Lr=7uH, Cr=0.27uF, D=0.5, fs=100KHz
Combination 2：Power stage and dutycycle are nominal parameters, but switching frequency is respectively the input series connection/defeated of upper lower deviation
Go out experiment in parallel
A module parameters：Lm=145uH, Lr=7uH, Cr=0.27uF, D=0.5, fs=90KHz
B module parameters：Lm=145uH, Lr=7uH, Cr=0.27uF, D=0.5, fs=110KHz
Combination 3：Power stage and switching frequency are nominal parameters, but dutycycle is respectively the input series connection/defeated of upper lower deviation
Go out experiment in parallel
A module parameters：Lm=145uH, Lr=7uH, Cr=0.27uF, D=0.55, fs=100KHz
B module parameters：Lm=145uH, Lr=7uH, Cr=0.27uF, D=0.45, fs=100KHz
Combination 4：Switching frequency and dutycycle are nominal parameters, but power stage parameter is respectively the input string of upper lower deviation
Connection/output-parallel experiment
A module parameters：Lm=130.5uH, Lr=6.3uH, Cr=0.22uF, D=0.5, fs=100KHz
B module parameters：Lm=159.5uH, Lr=7.7uH, Cr=0.22uF, D=0.5, fs=100KHz
Combination 5：Dutycycle is nominal parameters, but power stage parameter and switching frequency are respectively the input string of upper lower deviation
Connection/output-parallel experiment
A module parameters：Lm=130.5uH, Lr=6.3uH, Cr=0.22uF, D=0.55, fs=90KHz
B module parameters：Lm=159.5uH, Lr=7.7uH, Cr=0.22uF, D=0.45, fs=110KHz
The input voltage equalizing of system flows the experimental data of effect with output as shown in table 1 and table 2, and combination 1 is two
The good data of uniformity of module, can be seen that to input on the basis of it ensure that uniformity from the data and press precision all
Within 1%, flow precision and the inconsistencies of two modules also take into account all within ± 1%, even, its press with
Stream precision is also all in ± 10% precision.Table 3 is different input voltages and exported under full load conditions that it is defeated that various parameters are combined
Go out magnitude of voltage.
Under the different input voltages of table 1, the maximum input voltage of various parameters combination presses precision
| Press precision | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 |
| Vg=300V | ± 0.67% | ± 1.23% | ± 8.7% | ± 6.8% | ± 5.6% |
| Vg=400V | ± 0.38% | ± 1.20% | ± 8.2% | ± 6.8% | ± 5.5% |
| Vg=530V | ± 0.15% | ± 1.21% | ± 8.0% | ± 6.9% | ± 5.6% |
Under the different input voltages of table 2, the fully loaded output current of various parameters combination flows precision
| Flow precision | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 |
| Vg=300V | ± 0.10% | ± 0.92% | ± 8.5% | ± 6.6% | ± 6.1% |
| Vg=400V | ± 0.12% | ± 1.30% | ± 7.9% | ± 7.0% | ± 7.4% |
| Vg=530V | ± 0.25% | ± 1.63% | ± 7.6% | ± 7.3% | ± 6.9% |
Under the different input voltages of table 3 and output full load conditions, the output voltage (V) of various parameters combination
| Output voltage | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 |
| Vg=300V | 13.99 | 13.97 | 13.95 | 13.63 | 14.52 |
| Vg=400V | 19.28 | 19.25 | 19.24 | 18.81 | 19.99 |
| Vg=530V | 25.93 | 25.91 | 25.89 | 25.26 | 26.81 |
As can be seen that two modules can be met after two module input series and output parallel from three above form
Input pressure flows precision with output, but output voltage range is but more than input voltage range, current ACDC busbar voltage
Scope is 5:1 or so, then the design difficulty of the Voltage stabilizing module of rear class is very big.
Patent of invention content
Therefore, the technical problem to be solved in the present invention is：Realize in input series connection and this power-supply system of output-parallel
Input is pressed, and output stream is required, and can guarantee that it has high output voltage precision, realizes the direct connection in series-parallel of multiple modules,
Make power-supply system more flexible, it is more efficient compared to two-step scheme, export more stable, and do not influenceed by topology.Introduce mould
Block thought, input stage uses multiple block coupled in series modes, and the voltage stress of so each module will be substantially reduced.
In order to achieve the above object, the present invention is achieved by the following technical solutions：
A kind of power conversion module, inside is included：Main power circuit, control drive circuit, loop isolation circuit, former secondary
Isolation circuit, input voltage sample circuit, input grading ring, output regulation loop, the terminal of power conversion module comprise at least but
It is not limited to following：Positive input terminal, negative input end, positive output end, negative output terminal, signal output just, signal input just, output voltage
Sampling terminal.
Its annexation is：Two inputs of main power circuit are connected respectively to positive input terminal and negative input end, pass through
The power conversion of itself, is output to positive output end and negative output terminal, forms output voltage；
Two inputs of input voltage sample circuit are connected respectively to positive input terminal and negative input end, to input of sampling
Voltage, the output end of input voltage sample circuit is connected to the signal output of power conversion module just with inputting grading ring simultaneously
One input；
Another input of input grading ring is being connected to the signal input of power conversion module just, inputs the defeated of grading ring
Go out end and control drive circuit is connected to by an input of loop isolation circuit, to produce with corresponding input grading ring road
And the switching tube in the drive signal control main power circuit changed, form the grading ring road of power conversion module.
The output voltage sampling terminal of power conversion module is connected to the input of output regulation loop, exports the defeated of regulation loop
Go out end pass sequentially through former secondary isolation circuit, another input of loop isolation circuit is connected to control drive circuit, control
Drive circuit produces the switching tube in the drive signal control main power circuit changed with corresponding output voltage stabilizing loop, is formed
The voltage stabilizing loop of power conversion module.
Input voltage sample circuit, input grading ring, control drive circuit three and main power circuit primary side altogether, also
I.e.：Signal input just, signal output just with input voltage altogether reference voltage；The secondary for exporting regulation loop and main power circuit is total to
Ground, that is,：The common reference voltage of the output voltage of output voltage sampling terminal and power conversion module.
It is preferred that, main power circuit can use asymmetrical half-bridge flyback topologies.
Preferably, two switching tubes in asymmetrical half-bridge flyback topologies are metal-oxide-semiconductor or triode.
Preferably, stagger between the drive pulse signal of two switching tubes in asymmetrical half-bridge flyback topologies one prevent altogether
Lead to the dead time of short circuit.
Preferably, the dead time between the drive pulse signal of two switching tubes in asymmetrical half-bridge flyback topologies is
300nS。
It is used as the application of above-mentioned technical proposal：Output voltage sampling terminal can be connected with negative output terminal, shielding output
The function of regulation loop.
It is used as the application of above-mentioned technical proposal：It can input a signal into and be just connected with negative input end, shielding input grading ring
Function.
A kind of power-supply system being made up of above-mentioned power conversion module, including N (N is the natural number more than 1) individual above-mentioned work(
Rate modular converter, each power conversion module also includes but is not limited to following leading-out terminal：Signal output just, signal it is defeated
Enter just, positive input terminal, negative input end, positive output end, negative output terminal and output voltage sampling terminal；
The positive input terminal of first power conversion module is used as the positive input terminal of power-supply system, the letter of the first power conversion module
Number output is just hanging, and the negative input end of the first power conversion module is connected with the positive input terminal of the second power conversion module, and second
The negative input end of power conversion module is connected with the positive input terminal of the 3rd power conversion module, the like, the conversion of N-1 power
The negative input end of module is connected with the positive input terminal of N power conversion modules；First power conversion module signal input just with
The signal output of second power conversion module is just connected, the input of the signal of the second power conversion module just with the 3rd power modulus of conversion
The signal output of block is just connected, by that analogy, the input of the signals of N-1 power conversion modules just with N power conversion modules
Signal output is just connected, and the signal input of N power conversion modules is just connected and made with the negative input end of N power conversion modules
For the negative input end of power-supply system；
As the positive output end of power-supply system after the positive output end connection of described N number of power conversion module, described is N number of
The negative output terminal of power-supply system is used as after the negative output terminal connection of power conversion module.The output voltage of N power conversion modules
Sampling terminal is connected with the positive output end of power-supply system, the output voltage sampling terminal and electricity of remaining N-1 power conversion module
The negative output terminal of source system is connected.
Compared with prior art, the invention has the advantages that：
(1), inside modules have two loops, can carry out selection according to different demands and use；
(2) input series and output parallel system, can be easily constituted, and with stable voltage output, and input voltage
Flow precision；
(3), present invention employs modularized thoughts, system can be split into N number of identical standard module；
(4), the voltage stress and current stress of single standardized module are low, can reduce device cost；
(5), user directly can freely set up system using standard module as desired, portable high using flexible,
And requirement of the system to client is low, directly by the input series connection of module, output-parallel, it is not necessary to which this professional specialty is known
Know；
(6) power-supply system needed for, being constituted using reference power supply module, reduces product type, reduction management of product cost；
(7) DC voltage small-signal, is used between each standard module, multimode input series connection, output-parallel system are very
Easy fabric swatch, will not produce mutual interference.
Brief description of the drawings
The utility model patent Dual module input series and output parallel system frame of Fig. 1 Application No. 201621402396.3
Figure；
Dual module input series connection of the utility model patent of Fig. 2 Application No. 201621402396.3 with Voltage stabilizing module is defeated
Go out parallel system block diagram；
The input series and output parallel of the N number of standard module of utility model patent of Fig. 3 Application No. 201621402396.3
System block diagram；
The utility model patent of Fig. 4 Application No. 201621402396.3 carries the defeated of N number of standard module of Voltage stabilizing module
Enter to connect output-parallel system block diagram；
Fig. 5 is the theory diagram of the power conversion module of the present invention；
Fig. 6 is the external pin figure of the power conversion module of the present invention；
The double power conversion module input series connection of Fig. 7, the connection figure of the power-supply system of output-parallel；
The input series connection of the N number of power conversion modules of Fig. 8, the connection figure of the power-supply system of output-parallel；
The single power conversion modules of Fig. 9 are connected to export voltage stabilizing mode of operation schematic diagram；
The single power conversion modules of Figure 10 are connected to input and press mode of operation schematic diagram；
Individual module schematic diagram in Figure 11 first embodiment input series and output parallel systems；
Figure 12 first embodiments input grading ring schematic diagram.
Embodiment
The present invention proposes a kind of new power conversion module and the power-supply system being made up of the power conversion module, should
Contain in power conversion module and there are two loops in the power-supply system of double loop control system, i.e., one, a loop is used for controlling
Output voltage stabilization processed, another loop is used for controlling each module input voltage of N number of module input series and output parallel system
Press, hereafter can referred to as export regulation loop and input grading ring, it is necessary to explanation, the two loops in same module
Work simultaneously is not, it is necessary to which the connection in outer portion respectively constitutes output voltage stabilizing mode of operation and mode of operation is pressed in input, such as
Outside terminal connected mode shown in Fig. 9 and Figure 10, Fig. 9 exports the connected mode of voltage stabilizing mode of operation, and work is pressed in Figure 10 inputs
The connected mode of operation mode.
Fig. 5 is the theory diagram of power conversion module of the present invention, and main power circuit is used for carrying out input and output electricity
Press isolated variable；Drive circuit is controlled to provide control signal for main power circuit；Loop isolation circuit is pressed for isolation input
Ring and output two loops of regulation loop；Former secondary isolation circuit carries out isolation transmission to signal；Input grading ring causes input string
The input voltage for joining each power conversion module in output-parallel power-supply system is equal；Export regulation loop and be used for regulated output voltage；
Input voltage sample circuit is used for gathering the input voltage of power conversion module, and its input/output signal is linear.Mainly
Operation principle is described as follows：
When module is connected to output voltage stabilizing mode of operation, as shown in figure 9, input grading ring does not work, by inciting somebody to action
The signal input positive terminal of power conversion module be connected to negative input end realization, the output voltage sampling terminal of power conversion module with
Positive output voltage end is connected, and realizes the effect of sampling and outputting voltage.In this way, the power conversion module only one of which exports voltage stabilizing
Ring, its course of work will not be repeated here as regular tap power supply.
When module, which is connected to input, presses mode of operation, as shown in Figure 10, output regulation loop does not work, by inciting somebody to action
The output voltage sampling terminal of power conversion module is connected realization with negative output terminal, the signal input positive terminal of power conversion module with
The signal output anode of another power conversion module is connected (being used as loop sampled signal), the input in power conversion module
In grading ring module, compare the signal output anode (as loop reference signal) of itself and another power conversion module
The signal magnitude of signal output anode, produces the loop signals of control dutycycle.In this way, the power conversion module only one of which is defeated
Enter grading ring, except loop sampled signal is different from loop reference signal, other courses of work are as regular tap power supply, herein
Repeat no more.
First embodiment
The operation principle of patent first embodiment power-supply system of the present invention：
It is the circuit theory diagrams of power conversion module of the present invention shown in Figure 11.
The power conversion module includes：Main power circuit, input voltage sample circuit, control drive circuit, loop isolation
Circuit, former secondary isolation circuit, input grading ring, output regulation loop；At least seven terminal：Positive input terminal Vg+, negative input end
Vg-, positive output end Vo+, negative output terminal Vo-, signal input positive Vg_s_in+, the positive Vg_s_out+ of signal output, output voltage and adopted
Sample terminal Vo_s.
Two inputs of main power circuit are connected respectively to Vg+ and Vg-, and two output ends of main power circuit connect respectively
Vo+ and Vo- are connected to, two inputs of input voltage sample circuit are connected respectively to Vg+ and Vg-, input voltage sample circuit
Output end simultaneously be connected to Vg_s_out+ with input grading ring an input, input grading ring another input
Be connected to Vg_s_in+, the output end of input grading ring is connected to control drive circuit by loop isolation circuit, with produce with
Respective loops and change drive signal control main power circuit in switching tube.The output voltage sampling end of power conversion module
Son is connected to the input of output regulation loop, and the output end of output regulation loop passes sequentially through former secondary isolation circuit, loop isolation
Another input of circuit is connected to control drive circuit, and control drive circuit produces the driving letter changed with respective loops
Number control main power circuit in switching tube.
Each submodule internal component and annexation are as follows：
Main power circuit：Can be using the topology of asymmetrical half-bridge flyback power stage in the prior art, by electric capacity Cin, switch
S1 and S2, inductance Lr, electric capacity Cr, transformer T, transformer primary side winding Np, transformer secondary winding Ns, diode D1, electric capacity
C1, inductance L1 and electric capacity C2 compositions；Electric capacity Cin positive pole connection Vg+, negative pole connects Vg-, and Vg- is connected with primary side earth terminal；Open
S1 drain electrode connection electric capacity Cin and positive input terminal Vg+ tie point is closed, switch S1 source electrode is connected with inductance Lr one end, switched
Drain electrode of the S1 source electrode also with switching S2 is connected, switch S2 source electrode connection primary side earth terminals, inductance Lr other end connection transformation
Device primary side winding Np Same Name of Ends；Electric capacity Cr one end is connected with transformer primary side winding Np different names end, and the connection of the electric capacity Cr other ends is former
Side earth terminal, the different name end that transformer pair becomes winding Ns is connected with diode D1 anode, diode D1 negative electrode and electric capacity C1
Positive pole, inductance L1 one end connection, the inductance L1 other end is connected with electric capacity C2 positive pole, formation positive output end Vo+, transformation
The Same Name of Ends that device pair becomes winding Ns is connected with electric capacity C1 negative pole, electric capacity C2 negative pole, and accesses secondary earth terminal, forms negative defeated
Go out to hold Vo-.
Control drive circuit to use circuit commonly used in the prior art, adopted by control chip UC3843, drive circuit, electric current
Sample circuit, electric capacity Cq1, electric capacity Cq2, electric capacity Ct, electric capacity Cv2, resistance Rt, resistance Rv1, resistance Rv2, resistance Rv3, resistance R3,
Diode D2 and diode D3 compositions；Electric capacity Cq1 one end is connected with chip UC3843 energization pins Vcc and voltage vcc _ p, control
Coremaking piece UC3843 Vcc pins are from power Vcc _ p power takings, the grounding pin of the electric capacity Cq1 other ends simultaneously with chip UC3843
GND, the connection of primary side earth terminal；Drive circuit is connected with chip UC3843 output pin OUT, and exports two-way drive signal
Vgs1 and Vgs2, respectively to switch S1 and switch S2 grid, are that switch S1 and switch S2 provide switch controlling signal.To prevent
Need to stagger between two common short circuits of switching tube in asymmetrical half-bridge flyback topologies, two-way drive signal one dead time,
The present embodiment value 300nS；The electric capacity Cr's of the first input end of current sampling circuit and the second input and main power circuit
Two ends are in parallel, and the output end of current sampling circuit is connected with control chip UC3843 CS pins；Electric capacity Cq2 one end connects primary side
Earth terminal, the electric capacity Cq2 other ends connect reference voltage Vref, resistance Rt one end and control chip UC3843 reference voltage simultaneously
Vref, the resistance Rt other ends connect control chip UC3843 RT/CT pins and electric capacity Ct one end, another terminations of electric capacity Ct simultaneously
Enter primary side earth terminal；Electric capacity Cv2 is in parallel with resistance Rv3, one end connection control chip UC3843 of parallel circuit Comp pins,
The other end connects the Vfb pins of resistance Rv1 one end, resistance Rv2 one end and control chip UC3843 simultaneously, and Vfb pins are
Chip UC3843 feedback pin；
Loop isolation circuit, is made up of resistance Rv1, diode D2, resistance Rv2, diode D3, resistance R3, resistance Rv1's
One end is connected with resistance Rv2 one end, is used as the output end of loop isolation circuit；Resistance Rv1 other end connection diode D2
Negative electrode, D2 anode inputs the output end of grading ring circuit as the input connection of loop isolation circuit；Resistance Rv2
Other end connection diode D3 negative electrode, diode D3 anode is former secondary as another input connection of loop isolation circuit
The output end of side isolation circuit；D3 anode is also connected to resistance R3 one end, and the resistance R3 other ends are connected with primary side earth terminal.
Former secondary isolation circuit, is that can be achieved using optocoupler plus peripheral circuit；By optocoupler OC1, resistance R1, resistance R2 groups
Into；Optocoupler OC1 the first pin is connected with resistance R1 with resistance R2 series connection node, and the of the resistance R2 other ends and optocoupler OC1
Two pins are connected and as the input of former secondary isolation circuit, and the R1 other ends are connected with voltage end Vcc_s, and the of optocoupler OC1
Three pins are connected with reference voltage terminal Vref, optocoupler OC1 the 4th pin as former secondary isolation circuit output end.
Regulation loop is exported, is made up of resistance Rf1, resistance Rf2 and source of stable pressure TL431, resistance Rf1 and resistance Rf2 series connection, string
One end of connection circuit is connected to negative output terminal, and the other end of series circuit is connected to secondary earth terminal；Source of stable pressure TL431 anode
Secondary earth terminal is connected, TL431 negative electrode practices the output end as output regulation loop, and TL431 adjustable end is connected to resistance Rf1
With resistance Rf2 series connection node.
Input voltage sample circuit, is made up of resistance R6, resistance R7, resistance R8 and resistance R9.Resistance R6 and resistance R7 strings
Connection, one end of series circuit is connected to positive input terminal Vg+, and the other end is connected to Vg-；Resistance R8 and resistance R9 series connection, series electrical
The one end on road is connected to positive input terminal Vg+, and the other end is connected to Vg-；Resistance R8 and resistance R9 series connection node are connected to signal
Just, R6 and R7 series connection node are connected to an input of input grading ring for output.
Grading ring is inputted, by operational amplifier LM358, electric capacity Ci1, resistance Ri1, resistance R4, resistance R5 and resistance R10
Composition；Resistance R10 one end connection signal inputs positive Vg_s_in+ and as another input of input grading ring, resistance R10
The other end is connected with resistance Ril one end, the negative input end of operational amplifier, resistance R4 one end, and the resistance R4 other end is made
To input an input of grading ring；The resistance Ril other ends are connected with electric capacity Cil one end, the electric capacity Cil other ends and amplifier
A2 output end is connected and as the output end of input grading ring；The positive input terminal of resistance R5 one end concatenation operation amplifier,
The resistance R5 other ends are connected with primary side earth terminal.
Two rings are devised in each module：One output regulation loop, an input grading ring.Can be by simple
External cabling, to realize that the module of not same-action works.When needing to become Voltage stabilizing module, as long as inputting a signal into anode Vg_
S_in+ is connected to negative input end Vg-, and output voltage sampling terminal Vo_s is connected to positive output end；When needing to become pressure module
When, output voltage sampling terminal Vo_s only need to be connected to negative output terminal, module by signal input positive terminal Vg_s_in+ is connected to next
The module by signal output plus terminal Vg_s_out+ of module.The company of pressure module and output Voltage stabilizing module is inputted in the present embodiment
Connect and can be achieved using Fig. 9 and Figure 10 pin mode of connection, no longer drawn with the specific module principle figure shown in Figure 11
Displaying.
The connection of Dual module input series and output parallel power-supply system is that can be achieved using Fig. 7 pin mode of connection, its
Middle lower module is connected to an output voltage stabilizing closed-loop control, claims Voltage stabilizing module；Upper module is connected to an input and pressed off
Ring is controlled, and claims pressure module；Each module only has a closed loop in work.It is generalized to the input series connection of N number of module, exports simultaneously
It is coupled structure as shown in figure 8, only one of which module is connected to an output voltage stabilizing closed-loop control, remaining module is connected
It is connected into an input grading ring control.
Operation principle：
In this embodiment, whole system is made up of two power conversion module series connection inputs, Parallel opertations up and down, single
The main power stage operation principle of power conversion module is with asymmetrical half-bridge circuit of reversed excitation, and this is for a person skilled in the art
It is known technology, does not deploy herein.Control process is as follows：
As shown in fig. 7, upper module is the pressure module of system, it is responsible for the input size of adjustment upper module and lower module, makes
The input voltage of the two is equal, and operation principle is as follows：
The output voltage sampling terminal Vo-s1 of upper module is connected to the negative output terminal Vo1-, i.e. upper module of upper module output
Ground, the phototriode cut-off of optocoupler, therefore the transmitting electrode potential of phototriode is low, diode D3 cut-offs, now upper module
Output voltage stabilizing loop is shielded.Upper module signal inputs the positive Vg_s_out2+ of signal output that positive Vg_s_in1+ is connected to lower module,
Understand for convenience, grading ring part is individually drawn, as shown in figure 12, addition comparator is constituted using amplifier A1.Cin1、
Cin2 is respectively upper module input capacitance and lower module input capacitance, and R61, R71 are the input voltage sampling resistor of upper module,
R82, R92 are the input voltage sampling resistor of lower module, because adder is located in upper module, therefore for amplifier, R82
Be negative pressure with the voltage of R92 intermediate connections, can be set R61=R92, R71=R82, so when upper module input voltage with
When the input voltage of lower module is equal, i.e. Vg1=Vg2, amplifier anti-phase input terminal potential is zero；When the input voltage of upper module is omited
Higher than lower module input voltage when, amplifier output end output voltage decline, Comp voltages rise, control drive signal dutycycle
Become big, now the energy of upper module is more delivered to secondary, causes the voltage on the input capacitance Cin1 of upper module to decline；Instead
It, when the input voltage of lower module is higher than the input voltage of upper module, amplifier output end output voltage rises, under Comp voltages
Drop, control drive signal dutycycle diminishes, and now upper module is delivered to the energy reduction of secondary, causes the input capacitance of upper module
Voltage rise on Cin1.
The signal of lower module is inputted into the negative input end Vg- that positive Vg_s_in+ is connected to lower module, then inputted in grading ring
Operational amplifier A 1 anti-phase terminal voltage be higher than in-phase end voltage, therefore the saturation of operational amplifier A 1 output low level, diode
D2 ends, and the input grading ring of lower module is shielded.The output voltage sampling terminal Vo_s of lower module is connected to the negative of lower module
Output end vo-, now lower module is exactly the Switching Power Supply of a common voltage stabilizing output, and its operation principle is existing known skill
Art, will not be repeated here.
The present embodiment upper module and the Switching Power Supply that lower module is 60W, using asymmetrical half-bridge flyback topologies, input electricity
Pressure scope is 120VDC~240VDC, and two modules constitute 120W power-supply system, defeated under closed-loop work to it
The output-parallel effect that enters to connect has carried out experimental verification.In order to fully verify the present invention under tolerance to input pressure precision, defeated
Go out the influence of stream precision and output voltage precision, tolerance experimental verification has been carried out to it.Examine two kinds of poles of control parameter
Two kinds of extreme deviations of deviation and power stage parameter are held, by the size of power conversion module gain, a kind of new two are combined into
Plant the module of extreme deviations.Theoretically, the two modules that gain is maximum and gain is minimum correspond to following parameters respectively：
The maximum module of gain：Magnetizing inductance minimum value, leakage inductance minimum value, resonant capacitance minimum value, frequency minima,
I.e.：Lm(min),Lr(min),Cr(min),fs(min)；
The minimum module of gain：Magnetizing inductance maximum, leakage inductance maximum, resonant capacitance maximum, frequency maxima,
I.e.：Lm(max),Lr(max),Cr(max),fs(max)。
By four above-mentioned parameter combinations into following six groups of experiment parameters：
Combination 1：Power stage and control are input series connection/output-parallel experiment of nominal parameters
A module parameters：Lm=145uH, Lr=6.37uH, Cr=0.27uF, fs=100KHz
B module parameters：Lm=145uH, Lr=6.37uH, Cr=0.27uF, fs=100KHz
Combination 2：Power stage is canonical parameter, but switching frequency is respectively input series connection/output-parallel reality of upper lower deviation
Test
A module parameters：Lm=145uH, Lr=6.37uH, Cr=0.27uF, fs=90KHz
B module parameters：Lm=145uH, Lr=6.37uH, Cr=0.27uF, fs=110KHz
Combination 3：Switching frequency is nominal parameters, but power stage is respectively input series connection/output-parallel reality of upper lower deviation
Test
A module parameters：Lm=130.5uH, Lr=5.733uH, Cr=0.216uF, fs=100KHz
B module parameters：Lm=159.5uH, Lr=7.007uH, Cr=0.324uF, fs=100KHz
Combination 4：Switching frequency and power stage parameter are respectively input series connection/output-parallel experiment of upper lower deviation
A module parameters：Lm=130.5uH, Lr=5.733uH, Cr=0.216uF, fs=90KHz
B module parameters：Lm=159.5uH, Lr=7.007uH, Cr=0.324uF, fs=110KHz
Combination 5：Switching frequency is nominal parameters, but power stage is respectively input series connection/output-parallel reality of upper lower deviation
Test
A module parameters：Lm=159.5uH, Lr=7.007uH, Cr=0.324uF, fs=100KHz
B module parameters：Lm=130.5uH, Lr=5.733uH, Cr=0.216uF, fs=100KHz
Combination 6：Input series connection/output-parallel the experiment of switching frequency and power stage parameter respectively for the lower upper deviation
A module parameters：Lm=159.5uH, Lr=7.007uH, Cr=0.324uF, fs=110KHz
B module parameters：Lm=130.5uH, Lr=5.733uH, Cr=0.216uF, fs=90KHz
Tested according to six groups of above-mentioned combinations, the experimental result drawn is as shown in table 4 to table 7, and table 4 is different inputs
Under voltage, the maximum input voltage of various parameters combination presses precision；Table 5 be different input voltages under, various parameters combination
Fully loaded output current flows precision；Table 6 is different input voltages and exported under full load conditions that the output of various parameters combination is electric
Pressure；Table 7 is the grading ring and regulation loop go-and-return test result of the actual PCM controls closed-loop experiment in outer power supply DC-DC parts.
Under the different input voltages of table 4, the maximum input voltage of various parameters combination presses precision
| Press precision | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 | Combination 6 |
| Vg=300V | 0.25% | 0.17% | 0.13% | 0.00% | 1.07% | 0.60% |
| Vg=400V | 0.2% | 0.07% | 0.1% | 0.00% | 0.85% | 0.95% |
| Vg=530V | 0.3% | 0.15% | 0.38% | 0.75% | 0.42% | 0.72% |
Under the different input voltages of table 5, the fully loaded output current of various parameters combination flows precision
| Flow precision | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 | Combination 6 |
| Vg=300V | 0.37% | 0.09% | 0.37% | 0.28% | 0.37% | 0.37% |
| Vg=400V | 0.37% | 0.37% | 0.74% | 0.65% | 0.28% | 0.00% |
| Vg=530V | 1.11% | 0.46% | 0.55% | 1.2% | 0.09% | 0.09% |
Under the different input voltages of table 6 and output full load conditions, the output voltage (V) of various parameters combination
| Output voltage | Combination 1 | Combination 2 | Combination 3 | Combination 4 | Combination 5 | Combination 6 |
| Vg=300V | 12.02 | 12.02 | 12.02 | 12.02 | 12.02 | 12.02 |
| Vg=400V | 12.02 | 12.02 | 12.02 | 12.01 | 12.02 | 12.02 |
| Vg=530V | 12.02 | 12.00 | 12.00 | 12.01 | 12.01 | 12.01 |
Table 7：The grading ring and regulation loop go-and-return test result of the outer actual PCM controls closed-loop experiment in power supply DC-DC parts
From experimental result as can be seen that combination 1 to combination 6 input press precision and export stream precision all 1% with
Interior, output voltage precision inputs bandwidth 0.8KHz of grading ring or so also within 1%, and with very big phase margin with
Gain margin, from phase margin with from the point of view of gain margin, loop bandwidth also has very big increasing degree, loop stability very well,
Meet the requirement of input balanced pressure system.
The present invention program can fully be proved by above-mentioned experiment, input pressure precision and output can be not only met equal
Flow precision, it is often more important that output voltage precision can be controlled 1% or so, realized both to press and flowed, and regulated output voltage
Purpose, attained a yet higher goal than prior art.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention.For those skilled in the art, without departing from the spirit and scope of the present invention, also
Some improvements and modifications can be made, these improvements and modifications also should be regarded as protection scope of the present invention, here no longer with implementation
Example is repeated, and protection scope of the present invention should be defined by claim limited range.
Claims (9)
1. a kind of power conversion module, it is characterised in that：Including main power circuit, control drive circuit, loop isolation circuit, original
Secondary isolation circuit, input voltage sample circuit, input grading ring, output regulation loop, the terminal of described power conversion module
Comprise at least but be not limited to following：Positive input terminal, negative input end, positive output end, negative output terminal, signal output just, signal input
Just, output voltage sampling terminal；
Input voltage is input to main power circuit by positive input terminal and negative input end, is turned by the power of main power circuit in itself
Change, be output to positive output end and negative output terminal, form output voltage；
Two inputs of input voltage sample circuit are connected respectively to positive input terminal and negative input end, to input electricity of sampling
Pressure, the output end of input voltage sample circuit is connected to the signal output of power conversion module just with inputting the one of grading ring simultaneously
Individual input；
Another input of input grading ring is being connected to the signal input of power conversion module just, inputs the output end of grading ring
Control drive circuit is connected to by an input of loop isolation circuit, become with producing with corresponding input grading ring road
Switching tube in the drive signal control main power circuit of change, forms the grading ring road of power conversion module.
The output voltage sampling terminal of power conversion module is connected to the input of output regulation loop, exports the output end of regulation loop
Pass sequentially through former secondary isolation circuit, another input of loop isolation circuit is connected to control drive circuit, control driving
Circuit produces the switching tube in the drive signal control main power circuit changed with corresponding output voltage stabilizing loop, forms power
The voltage stabilizing loop of modular converter.
2. power conversion module according to claim 1, it is characterised in that：Input voltage sample circuit, input grading ring,
Control the primary side of drive circuit three and main power circuit altogether, that is,：Signal input just, signal output it is just common with input voltage
Reference voltage；Export the secondary of regulation loop and main power circuit altogether, that is,：Output voltage sampling terminal and power conversion module
Output voltage altogether reference voltage.
3. power conversion module according to claim 2, it is characterised in that：Described main power circuit is using asymmetric half
Bridge flyback topologies.
4. power conversion module according to claim 3, it is characterised in that：In described asymmetrical half-bridge flyback topologies
Two switching tubes are metal-oxide-semiconductor or triode.
5. power conversion module according to claim 4, it is characterised in that：The driving pulse letter of two described switching tubes
Staggering between number one section prevents common short-circuit dead time.
6. power conversion module according to claim 5, it is characterised in that：Described dead time is 300nS.
7. power conversion module according to claim 6, it is characterised in that：By output voltage sampling terminal and negative output terminal
Connection, the function of shielding output regulation loop.
8. power conversion module according to claim 6, it is characterised in that：Input a signal into and be just connected with negative input end,
The function of shielding input grading ring.
9. a kind of power-supply system, it is characterised in that：Including the power conversion module described in N number of claim 1 or 2, N is more than 1
Natural number；Each power conversion module is including but not limited to following leading-out terminal：Signal output just, signal input just,
Positive input terminal, negative input end, positive output end, negative output terminal and output voltage sampling terminal；
The positive input terminal of first power conversion module is as the positive input terminal of power-supply system, and the signal of the first power conversion module is defeated
Go out just vacantly, the negative input end of the first power conversion module is connected with the positive input terminal of the second power conversion module, the second power
The negative input end of modular converter is connected with the positive input terminal of the 3rd power conversion module, the like, N-1 power conversion modules
Negative input end be connected with the positive input terminal of N power conversion modules；The signal input of first power conversion module is just with second
The signal output of power conversion module is just connected, the input of the signal of the second power conversion module just with the 3rd power conversion module
Signal output is just connected, by that analogy, and the signal of N-1 power conversion modules inputs the signal just with N power conversion modules
Output is just connected, and the input of the signals of N power conversion modules is just connected with the negative input end of N power conversion modules and is used as electricity
The negative input end of source system；
The positive output end of power-supply system, described N number of power are used as after the positive output end connection of described N number of power conversion module
The negative output terminal of power-supply system is used as after the negative output terminal connection of modular converter.The output voltage sampling of N power conversion modules
Terminal is connected with the positive output end of power-supply system, the output voltage sampling terminal and power supply system of remaining N-1 power conversion module
The negative output terminal of system is connected.
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| CN107294391B (en) | 2020-02-14 |
| WO2019029303A1 (en) | 2019-02-14 |
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