CN109842298A - A kind of pulse load power-supply system and its control method - Google Patents
A kind of pulse load power-supply system and its control method Download PDFInfo
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Abstract
本发明公开了一种脉冲负载电源系统及其控制方法。所述脉冲负载电源系统，由一个隔离双输出变换模块和一个非隔离直流变换器组成，其中隔离双输出变换模块包括一个输入端口和两个输出端口，隔离双输出变换模块的第二输出端口连接非隔离直流变换器的输入端口，非隔离直流变换器的输出端口和隔离双输出变换模块第一输出端口串联，作为系统总输出端口，总输出端口接脉冲负载。通过隔离双输出变换模块控制其第一输出端口的电压和输入电流，通过非隔离直流变换器控制系统总输出电压，本发明能够有效抑制脉冲功率在输入端口产生的电流冲击，同时减小系统功率变换级数、提高系统效率和功率密度，特别适用于有脉冲负载的应用场合。
The invention discloses a pulse load power supply system and a control method thereof. The pulse load power supply system is composed of an isolated dual-output conversion module and a non-isolated DC converter, wherein the isolated dual-output conversion module includes one input port and two output ports, and the second output port of the isolated dual-output conversion module is connected to The input port of the non-isolated DC converter, the output port of the non-isolated DC converter and the first output port of the isolated dual-output conversion module are connected in series as the total output port of the system, and the total output port is connected to the pulse load. The voltage and input current of the first output port are controlled by the isolated dual output conversion module, and the total output voltage of the system is controlled by the non-isolated DC converter. The present invention can effectively suppress the current impact generated by the pulse power at the input port, and at the same time reduce the system power Transform the number of stages, improve system efficiency and power density, especially suitable for applications with pulsed loads.
Description
Technical field
The present invention relates to a kind of power supply system more particularly to a kind of pulse load power-supply systems and its control method, belong to
Technics of Power Electronic Conversion and power supply system field.
Background technique
Pulse load appears widely in the fields such as material surface processing, biological medicine, food sterilization.It requires power-supply system
It is capable of providing the electric current of stable voltage and pulse change.Traditional pulse load power-supply system has shortcomings:
1, power supply is designed according to pulse load peak power, volume weight is all very big, and system power-density is low；
2, lack the control to input current.The current impulse that pulse load generates can be transmitted to power supply system by converter
System input terminal, influences other electrical equipments.While the pulsating current in order to inhibit input terminal, need to increase input filtering ginseng
Number causes system whole efficiency to decline；
3, lack and output voltage is precisely controlled.Burning voltage is kept by increasing capacitor in traditional approach, is caused
Capacitor volume is excessive, and system power-density is low.
In order to solve the defect of above-mentioned traditional pulse power supply, power decoupling circuit is had received widespread attention, as patent is (public
The number of opening: CN108964241A) in patent (publication number: CN208078920U) all use similar decoupling-structure.Use
One reversible transducer is connected in parallel on the output port of pulse load main power source, provides pulse power for pulse load, and pulse is negative
The main power source of load only needs to provide mean power.When not having pulse, the electric energy of main power source is stored in another by reversible transducer
In the capacitor at end, when pulse arrives, capacitor supplements the deficiency of main power source power supply by reversible transducer electric discharge.This structure
So that main power source only needs to design according to mean power；Reversible transducer compensates for most of pulse power, so that being transmitted to master
The current impulse of power input reduces；Reversible transducer can obtain cracking response speed using complex control algorithm, subtract
The volume of capacitor in small main power source.But this scheme is not solved there are two problem still: 1, there is still a need for press reversible transducer
It is designed according to pulse peak power；2, pulse power needs hereafter to flow by main power source and flow out reversible transducer ability again
It is supplied to load, have passed through multi-stage transformation, system effectiveness is not high.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of pulse load power-supply system and its controlling parties
Method.
The purpose of the present invention is achieved through the following technical solutions.
Power-supply system of the present invention is by an isolation dual output conversion module and a non-isolated DC converter group
At isolation dual output conversion module includes an input port and two output ports, wherein input port and two output ends
What mouth was galvanically isolated；
The second output terminal mouth of isolation dual output conversion module connects the input port of non-isolated DC converter, non-isolated
The output port of DC converter is connected with the first output port, as the total output port of system.
The implementation of the isolation dual output conversion module is using any one in following three kinds of modes:
Mode one: an input port is provided simultaneously using an integrated isolation dual output DC converter and two defeated
Exit port；
Mode two: it is combined using a non-isolated converter with two isolated converters and an input port and two is provided
Output port, wherein the input port of non-isolated converter is as the input port that dual output conversion module is isolated, non-isolated change
The output port of parallel operation is connected to the input port of two isolated converters, and the output port of two isolated converters is as isolation
Two output ports of dual output conversion module；
Mode three: providing an input port and two output ports using two isolated converter combinations, one of them
Input port of the input port of isolated converter as isolation dual output conversion module, while the output end of the isolated converter
Mouth is connected to the input port of another isolated converter and the second output terminal mouth as isolation dual output conversion module,
First output port of the output port of another isolated converter as isolation dual output conversion module.
The specific control of the isolation dual output conversion module and non-isolated DC converter of the pulse load power-supply system
Method is as follows:
(1) the peak value U of dual output conversion module real-time sampling the first output port voltage is isolatedo1maxWith input port electric current
Iin, the peak value U for the first output port voltage that sampling is obtainedo1maxWith first voltage benchmark Uref1Compare to obtain error signal,
The error signal forms the current reference of isolation dual output conversion module input current control after first voltage adjuster
Iinref, using the obtained input port electric current I of samplinginWith current reference IinrefCompare to obtain error signal, error signal warp
The control signal of isolation dual output conversion module is formed after overcurrent adjuster, the signal function is in isolation dual output conversion module
And it is used for the adjusting of its first output port voltage and input current, realize the control of isolation dual output conversion module；
(2) the peak value U of above-mentioned (1) for the first output port voltageo1maxControl could alternatively be for second output
The peak value U of port voltageo2maxIt is controlled, the peak value U for the second output terminal mouth voltage that sampling is obtainedo2maxWith second voltage
Benchmark Uref2Compare to obtain error signal, which forms isolation dual output conversion module after second voltage adjuster
The current reference I of input current controlinref, consistent described in the control mode and (1) for electric current；
(3) the total output voltage U of non-isolated DC converter real-time samplingo, total output voltage UoWith total voltage benchmark UorefThan
Error signal is relatively obtained, which forms the control signal of non-isolated DC converter by tertiary voltage adjuster, should
Signal function is in non-isolated DC converter, so that the output port voltage U of non-isolated DC convertero3It is double to can compensate for isolation
Output transform module the first output port voltage Uo1Fluctuation, keep total output voltage UoWith total voltage benchmark UorefIt is equal.
The invention has the following beneficial effects:
(1) input current and pulse load electric current that dual output conversion module is isolated, which are realized, to be decoupled, therefore dual output is isolated
Conversion module can carry out parameter designing according to the mean power of pulse load；
(2) present system structure is used, Partial Power is mentioned by the way that the first output port of dual output conversion module is isolated
Pulse load is supplied, i.e. Partial Power is only by isolation dual output conversion module, and power conversion series is few, and system effectiveness is high；
(3) using the control program of isolation dual output conversion module of the present invention, so that input current is controlled, therefore can
To inhibit the impact of input current；
(4) using the control program of non-isolated DC converter of the present invention, total output voltage can be accurately controlled, it is real
Existing quick voltage compensation, reduces capacitor volume.
Detailed description of the invention
Attached drawing 1 is pulse load power system structure schematic diagram of the present invention；
Attached drawing 2 is the structural representation that dual output conversion module implementation one is isolated in pulse load power-supply system of the present invention
Figure；
Attached drawing 3 is the structural representation that dual output conversion module implementation two is isolated in pulse load power-supply system of the present invention
Figure；
Attached drawing 4 is the structural representation that dual output conversion module implementation three is isolated in pulse load power-supply system of the present invention
Figure；
Attached drawing 5 is the first output port voltage that dual output conversion module is isolated in pulse load power-supply system of the present invention
The control block diagram of peak value and input port electric current；
Attached drawing 6 is the second output terminal mouth voltage that dual output conversion module is isolated in pulse load power-supply system of the present invention
The control block diagram of peak value and input port electric current；
Attached drawing 7 is the control block diagram of non-isolated DC converter in pulse load power-supply system of the present invention；
Attached drawing 8 is the circuit diagram of pulse load power-supply system specific embodiment of the present invention；
Designation in the figures above: Uin、Uo1And Uo2Respectively correspond the input port electricity of isolation dual output conversion module
Pressure, the first output port voltage and second output terminal mouth voltage.Uo1maxAnd Uo2maxRespectively correspond isolation dual output conversion module the
The peak value of one output port voltage and the peak value of second output terminal mouth voltage.IinThe input terminal of corresponding isolation dual output conversion module
Mouth electric current, UoCorrespond to the total output voltage of system, Co1、Co2And Co3For capacitor, IpluseThe pulse current generated for pulse load.
UorefFor the reference voltage of total output voltage, Uref1And Uref2The first output port of dual output conversion module voltage is respectively isolated
Peak value Uo1maxWith the peak value U of second output terminal mouth voltageo2maxReference voltage；IinrefFor the peak of the first output port voltage
Value Uo1maxWith first voltage benchmark Uref1The isolation dual output conversion module formed after making the difference by first voltage adjuster is defeated
The current reference of inbound port electric current, IinrefIt is also possible to the voltage U of second output terminal moutho2maxWith second voltage benchmark Uref2It makes the difference
The current reference of the isolation dual output conversion module input port electric current formed later by second voltage adjuster.S1、S2、S3、
S4、S5And S6For switching tube, D1、D2、D3、D4、D5、D6、D7And D8For diode, LEAnd LfFor inductance, T is transformer.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
A kind of pulse load power system structure schematic diagram of the present invention is as shown in Fig. 1.The pulse load electricity
Source system is made of an isolation dual output conversion module and a non-isolated DC converter.Wherein isolation dual output converts mould
Block includes an input port and two output ports (the first output port and second output terminal mouth).Dual output is isolated and converts mould
The second output terminal mouth of block is connected to non-isolated DC converter input port.Non-isolated DC converter output port be isolated
First output port of dual output conversion module is connected, as the total output port of system.
In pulse load power-supply system of the present invention, the implementation of isolation dual output conversion module is using following
Any one in three kinds of modes.
Embodiment one: input port and two output ends are provided simultaneously using an integrated isolation dual-output converter
Mouthful, structural schematic diagram is as shown in Fig. 2.In the specific implementation, the alternative circuit topology class of dual-output converter is isolated
There are many type, such as document " Y.Chen, Y.Kang, S.Nie and X.Pei, The Multiple-Output DC-DC
Converter With Shared ZCS Lagging Leg, in IEEE Transactions on Power
The dual-output converter topology being previously mentioned in Electronics, vol.26, no.8, pp.2278-2294, Aug.2011. ", with
And document " A Multioutput LLC Resonant Converter With Semi-Active Rectifiers, in
IEEE Journal of Emerging and Selected Topics in Power Electronics, vol.5, no.4,
The dual-output converter topology being previously mentioned in pp.1819-1827, Dec.2017. ".
Embodiment two: using a non-isolated converter combined with two isolated converters offer one input port and
Two output ports, wherein the input port of non-isolated converter as isolation dual output conversion module input port, it is non-every
Output port from converter is connected to the input port of two isolated converters, the output port conduct of two isolated converters
Two output ports of dual output conversion module are isolated；The structural schematic diagram of embodiment two is as shown in Fig. 3.It is being embodied
When, arbitrary non-isolated DC converter and isolated DC transducer may serve to building isolation dual output conversion module.
For example, non-isolated converter selects Buck converter, isolated converter selects LLC resonant converter.
Embodiment three: providing an input port and two output ports using two isolated converter combinations, wherein
Input port of the input port of one isolated converter as isolation dual output conversion module, while the isolated converter is defeated
Exit port is connected to the input port of another isolated converter and the second output terminal as isolation dual output conversion module
Mouthful, first output port of the output port of another isolated converter as isolation dual output conversion module.Embodiment
Three structural schematic diagram is as shown in Fig. 4.In the specific implementation, arbitrary isolated DC converter may serve to building isolation
The circuit topology of dual output conversion module, two isolated DC converters may be the same or different.For example, two isolation
Converter all selects LLC resonant converter.
In pulse load power-supply system of the present invention, non-isolated DC converter can be simply non-using structure
Isolated DC converter, such as Buck converter.
In pulse load power-supply system of the present invention, isolation dual output conversion module controls the first output port voltage
Uo1Or second output terminal mouth voltage Uo2, and control signal mouth electric current Iin, non-isolated DC converter control system always exports
Voltage Uo.Specific control method is as follows:
(1) the peak value U of dual output conversion module real-time sampling the first output port voltage is isolatedo1maxWith input port electric current
Iin, the peak value U for the first output port voltage that sampling is obtainedo1maxWith first voltage benchmark Uref1Compare to obtain error signal,
The error signal forms the current reference of isolation dual output conversion module input current control after first voltage adjuster
Iinref, using the obtained input port electric current I of samplinginWith current reference IinrefCompare to obtain error signal, error signal warp
The control signal of isolation dual output conversion module is formed after overcurrent adjuster, the signal function is in isolation dual output conversion module
And it is used for the adjusting of its first output port voltage and input current, realize the control of isolation dual output conversion module；Isolation is double
The peak value of output transform module the first output port voltage and the control block diagram of input port electric current are as shown in Fig. 5.
(2) the peak value U of above-mentioned (1) for the first output port voltageo1maxControl could alternatively be for second output
The peak value U of port voltageo2maxIt is controlled, the peak value U for the second output terminal mouth voltage that sampling is obtainedo2maxWith second voltage
Benchmark Uref2Compare to obtain error signal, which forms isolation dual output conversion module after second voltage adjuster
The current reference I of input current controlinref, consistent described in the control mode and (1) for electric current, isolation dual output converts mould
The peak value of block second output terminal mouth voltage and the control block diagram of input port electric current are as shown in Fig. 6.
(3) the total output voltage U of non-isolated DC converter real-time samplingo, total output voltage UoWith total voltage benchmark UorefThan
Error signal is relatively obtained, which forms the control signal of non-isolated DC converter by tertiary voltage adjuster, should
Signal function is in non-isolated DC converter, so that the output port voltage U of non-isolated DC convertero3It is double to can compensate for isolation
Output transform module the first output port voltage Uo1Fluctuation, keep total output voltage UoWith total voltage benchmark UorefIt is equal.It is non-
The control block diagram that isolated DC converter controls total output voltage is as shown in Fig. 7.
Pulse load power-supply system of the present invention is embodied in compared to the protrusion innovative point and progress place of existing solution:
Creative exports concatenated structure using dual-output converter, changes in the past with the thinking of reversible transducer compensation electric current, turns
And voltage is compensated.This input current for not only making that dual output conversion module is isolated and pulse load electric current are realized and are solved
Coupling, additionally it is possible to realize that mean power designs, it is low that non-isolated DC converter has benefited from output voltage, therefore design power is even more remote
Less than mean power.Partial Power is supplied to pulse load by isolation the first output port of dual output conversion module.So that function
Rate transformation series is reduced, and improves system effectiveness.In addition non-isolated DC converter is for isolation dual output conversion module
First output port voltage carries out voltage compensation, so that total output voltage UoIt is precisely controlled, while capacitor's capacity is subtracted
It is small.
In one particular embodiment of the present invention, isolation dual output conversion module uses attached integrated isolation shown in Fig. 7
Dual-output converter realizes that non-isolated DC converter realized by Buck converter.Lose-lose is isolated shown in attached drawing 7 by adjusting
4th and third switching tube (S in converter out4、S3) driving signal relative to the first and second switching tube (S1、S2) driving
The phase shifting angle of signal realizes the peak value U of the first output port voltageo1maxWith input current IinStabilization.By adjusting attached drawing 8
5th and the 6th switching tube (S in shown non-isolated DC converter5、S6) duty ratio realize total output voltage UoStablize.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
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| CN113852275A (en) * | 2021-09-17 | 2021-12-28 | 北京交通大学 | Step-down negative resistance converter |
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| CN115833547A (en) * | 2023-02-08 | 2023-03-21 | 西南交通大学 | A decoupling circuit and control method suitable for wide-band pulse load |
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| CN115833547A (en) * | 2023-02-08 | 2023-03-21 | 西南交通大学 | A decoupling circuit and control method suitable for wide-band pulse load |
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