CN109842298B - Pulse load power supply system and control method thereof - Google Patents
Pulse load power supply system and control method thereof Download PDFInfo
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Abstract
The invention discloses a pulse load power supply system and a control method thereof. The pulse load power supply system is composed of an isolation dual-output conversion module and a non-isolation direct-current converter, wherein the isolation dual-output conversion module comprises an input port and two output ports, a second output port of the isolation dual-output conversion module is connected with the input port of the non-isolation direct-current converter, an output port of the non-isolation direct-current converter is connected with a first output port of the isolation dual-output conversion module in series to serve as a total output port of the system, and the total output port is connected with a pulse load. The voltage and the input current of the first output port of the isolated double-output conversion module are controlled by the isolated double-output conversion module, and the total output voltage of the system is controlled by the non-isolated direct-current converter.
Description
Technical Field
The invention relates to a power supply system, in particular to a pulse load power supply system and a control method thereof, and belongs to the field of power electronic transformation and power supply systems.
Background
Pulse loading is widely applied to the fields of material surface treatment, biomedicine, food disinfection and the like. It requires a power supply system capable of supplying a stable voltage and a pulsed current. The conventional pulse load power supply system has a plurality of disadvantages:
1, designing a power supply according to the peak power of a pulse load, wherein the volume and the weight are large, and the power density of a system is low;
2, there is a lack of control over the input current. The current pulse generated by the pulse load is conducted to the input end of the power supply system through the converter, and other electric equipment is influenced. Meanwhile, in order to suppress the pulsating current at the input end, the filtering parameter at the input end needs to be increased, so that the overall efficiency of the system is reduced;
and 3, lack of precise control over the output voltage. In the traditional mode, the stable voltage is kept by increasing the capacitance, so that the capacitance volume is overlarge, and the system power density is low.
In order to solve the above-mentioned drawbacks of the conventional pulse power supply, a power decoupling circuit has attracted much attention, and similar decoupling structures are adopted in both patent (publication: CN108964241A) and patent (publication: CN 208078920U). The pulse load is provided with pulse power by connecting a bidirectional converter in parallel with an output port of a main power supply of the pulse load, and the main power supply of the pulse load only needs to provide average power. When no pulse occurs, the electric energy of the main power supply is stored in the capacitor at the other end by the bidirectional converter, and when the pulse arrives, the capacitor is discharged by the bidirectional converter to supplement the shortage of the power supply of the main power supply. This configuration allows the main power supply to be designed only for average power; the bidirectional converter compensates most of the pulse power so that the current pulse delivered to the main power input is reduced; the bidirectional converter can adopt a complex control algorithm to obtain a fast response speed, and the volume of a capacitor in a main power supply is reduced. However, this solution still has two problems that are not solved: 1, the bidirectional converter still needs to be designed according to pulse peak power; 2, the pulse power needs to pass through the main power supply, then flows into the bidirectional converter and then flows out of the bidirectional converter to be supplied to the load, and the system efficiency is not high after the multi-stage conversion.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a pulse load power supply system and a control method thereof.
The purpose of the invention is realized by the following technical scheme.
The power supply system comprises an isolation double-output conversion module and a non-isolation direct-current converter, wherein the isolation double-output conversion module comprises an input port and two output ports, and the input port and the two output ports are electrically isolated;
and a second output port of the isolated double-output conversion module is connected with an input port of the non-isolated direct-current converter, and an output port of the non-isolated direct-current converter is connected with the first output port in series to serve as a total output port of the system.
The implementation mode of the isolation dual-output transformation module adopts any one of the following three modes:
the first method is as follows: an integrated isolation double-output direct current converter is adopted to simultaneously provide an input port and two output ports;
the second method comprises the following steps: the method comprises the steps that a non-isolated converter and two isolated converters are combined to provide an input port and two output ports, wherein the input port of the non-isolated converter is used as the input port of an isolated double-output conversion module, the output port of the non-isolated converter is connected to the input ports of the two isolated converters, and the output ports of the two isolated converters are used as the two output ports of the isolated double-output conversion module;
the third method comprises the following steps: the method comprises the steps that two isolation converters are combined to provide an input port and two output ports, wherein the input port of one isolation converter serves as the input port of an isolation dual-output conversion module, the output port of the isolation converter is connected to the input port of the other isolation converter and serves as the second output port of the isolation dual-output conversion module, and the output port of the other isolation converter serves as the first output port of the isolation dual-output conversion module.
The specific control method of the isolation double-output conversion module and the non-isolation direct-current converter of the pulse load power supply system is as follows:
(1) isolated dual-output conversion module samples peak value U of voltage of first output port in real timeo1maxAnd input port current IinThe peak value U of the voltage of the first output port obtained by samplingo1maxAnd a first voltage reference Uref1Comparing to obtain an error signal, and forming a current reference I controlled by the input current of the isolated dual-output conversion module after the error signal passes through the first voltage regulatorinrefInput port current I obtained by samplinginAnd a current reference IinrefComparing to obtain an error signal, forming a control signal of the isolation dual-output conversion module after the error signal passes through the current regulator, wherein the signal acts on the isolation dual-output conversion module and is used for regulating the voltage and the input current of a first output port of the isolation dual-output conversion module, so that the control of the isolation dual-output conversion module is realized;
(2) peak value U for the first output port voltage in (1) aboveo1maxMay be replaced by a peak U for the second output port voltageo2maxControlling the sampled peak value U of the voltage of the second output porto2maxAnd a second voltage reference Uref2Comparing to obtain an error signal, and forming a current reference I controlled by the input current of the isolated dual-output conversion module after the error signal passes through the second voltage regulatorinrefTo aThe control mode of the current is consistent with that in (1);
(3) real-time sampling total output voltage U of non-isolated direct current converteroTotal output voltage UoAnd a total voltage reference UorefComparing to obtain an error signal, forming a control signal of the non-isolated DC converter by the error signal through a third voltage regulator, and applying the control signal to the non-isolated DC converter to enable the output port voltage U of the non-isolated DC convertero3Can compensate first output port voltage U of isolation dual output transform moduleo1To maintain the total output voltage UoAnd a total voltage reference UorefAre equal.
The invention has the following beneficial effects:
(1) the input current of the isolation dual-output conversion module is decoupled from the pulse load current, so that the isolation dual-output conversion module can carry out parameter design according to the average power of the pulse load;
(2) by adopting the system structure, part of power is provided for the pulse load through the first output port of the isolation dual-output conversion module, namely, part of power only passes through the isolation dual-output conversion module, the number of power conversion stages is small, and the system efficiency is high;
(3) by adopting the control scheme of the isolation double-output conversion module, the input current is controlled, so that the impact of the input current can be inhibited;
(4) by adopting the control scheme of the non-isolated direct current converter, the total output voltage can be accurately controlled, the rapid voltage compensation is realized, and the volume of a capacitor is reduced.
Drawings
FIG. 1 is a schematic diagram of a pulse load power supply system according to the present invention;
FIG. 2 is a schematic structural diagram of a first implementation manner of an isolation dual-output conversion module in a pulse load power supply system according to the present invention;
FIG. 3 is a schematic structural diagram of a second implementation of an isolated dual-output transform module in a pulse load power supply system according to the present invention;
FIG. 4 is a schematic structural diagram of a third implementation manner of an isolation dual-output conversion module in the pulse load power supply system according to the present invention;
FIG. 5 is a control block diagram of the peak voltage at the first output port and the input port current at the first output port of the isolated dual-output transform module in the pulsed load power supply system of the present invention;
FIG. 6 is a control block diagram of the peak voltage at the second output port and the input port current at the second output port of the isolated dual-output transform module in the pulsed load power supply system of the present invention;
FIG. 7 is a control block diagram of a non-isolated DC converter in the pulsed load power supply system of the present invention;
FIG. 8 is a circuit schematic of an embodiment of a pulsed load power supply system of the present invention;
symbolic names in the above figures: u shapein、Uo1And Uo2The voltage of the input port, the voltage of the first output port and the voltage of the second output port of the isolation dual-output conversion module respectively correspond to the voltage of the input port, the voltage of the first output port and the voltage of the second output port of the isolation dual-output conversion module. U shapeo1maxAnd Uo2maxThe peak value of the voltage of the first output port and the peak value of the voltage of the second output port of the isolation dual-output conversion module are respectively corresponded. I isinInput port current, U, corresponding to isolated dual-output conversion moduleoCorresponding to the total output voltage of the system, Co1、Co2And Co3Is a capacitor, IpluseA pulsed current generated for a pulsed load. U shapeorefIs a reference voltage of the total output voltage, Uref1And Uref2Peak values U of voltage of first output port of isolation dual-output conversion moduleo1maxAnd the peak value U of the second output port voltageo2maxA reference voltage of (d); i isinrefIs the peak value U of the first output port voltageo1maxAnd a first voltage reference Uref1After the difference is made, the current reference of the current at the input port of the isolation dual-output conversion module formed by the first voltage regulator is IinrefOr the voltage U of the second output porto2maxAnd a second voltage reference Uref2And after the difference is made, the current reference of the current at the input port of the isolated dual-output conversion module formed by the second voltage regulator is used. S1、S2、S3、S4、S5And S6Is a switch tube, and is characterized in that,D1、D2、D3、D4、D5、D6、D7and D8Is a diode, LEAnd LfIs an inductor and T is a transformer.
Detailed Description
The invention will be further explained with reference to the drawings.
The structure schematic diagram of a pulse load power supply system is shown in the attached figure 1. The pulse load power supply system consists of an isolation double-output conversion module and a non-isolation direct-current converter. The isolated dual-output transformation module comprises an input port and two output ports (a first output port and a second output port). And the second output port of the isolated dual-output conversion module is connected to the input port of the non-isolated direct-current converter. The output port of the non-isolated direct current converter is connected with the first output port of the isolated dual-output conversion module in series to serve as the total output port of the system.
In the pulse load power supply system, the isolation dual-output conversion module is implemented in any one of the following three ways.
The first implementation mode comprises the following steps: an integrated isolated dual-output converter is adopted to provide an input port and two output ports at the same time, and the structural schematic diagram of the converter is shown in figure 2. In particular embodiments, there are many circuit topologies available for isolating The dual Output Converter, such as those mentioned in The references "y.chen, y.kang, s.nie and x.pei, The Multiple-Output DC-DC Converter With Shared ZCS bridging Leg, in IEEE Transactions on Power Electronics, vol.26, No.8, pp.2278-2294, aug.2011", and The Multiple LLC Converter With switch Electronics, vol.5, No.4, No. 1819-1827, dec.2017.
The second embodiment: the method comprises the steps that a non-isolated converter and two isolated converters are combined to provide an input port and two output ports, wherein the input port of the non-isolated converter is used as the input port of an isolated double-output conversion module, the output port of the non-isolated converter is connected to the input ports of the two isolated converters, and the output ports of the two isolated converters are used as the two output ports of the isolated double-output conversion module; the structure of the second embodiment is schematically shown in fig. 3. In specific implementation, any non-isolated dc converter and isolated dc converter can be used to construct an isolated dual-output converter module. For example, the non-isolated converter is a Buck converter, and the isolated converter is an LLC resonant converter.
The third embodiment is as follows: the method comprises the steps that two isolation converters are combined to provide an input port and two output ports, wherein the input port of one isolation converter serves as the input port of an isolation dual-output conversion module, the output port of the isolation converter is connected to the input port of the other isolation converter and serves as the second output port of the isolation dual-output conversion module, and the output port of the other isolation converter serves as the first output port of the isolation dual-output conversion module. The third embodiment is shown in fig. 4. In specific implementation, any isolated dc converter can be used to construct an isolated dual-output conversion module, and the circuit topologies of the two isolated dc converters may be the same or different. For example, an LLC resonant converter is selected for both isolated converters.
In the pulse load power supply system, the non-isolated direct current converter can adopt a non-isolated direct current converter with a simple structure, such as a Buck converter.
In the pulse load power supply system, the isolation dual-output conversion module controls the voltage U of the first output porto1Or the second output port voltage Uo2And controlling the input port current IinTotal output voltage U of non-isolated DC converter control systemo. The specific control method comprises the following steps:
(1) isolated dual-output conversion module samples peak value U of voltage of first output port in real timeo1maxAnd input port current IinThe peak value U of the voltage of the first output port obtained by samplingo1maxAnd a first voltage reference Uref1Comparing to obtain an error signal, and forming a current reference I controlled by the input current of the isolated dual-output conversion module after the error signal passes through the first voltage regulatorinrefInput port current I obtained by samplinginAnd a current reference IinrefComparing to obtain an error signal, forming a control signal of the isolation dual-output conversion module after the error signal passes through the current regulator, wherein the signal acts on the isolation dual-output conversion module and is used for regulating the voltage and the input current of a first output port of the isolation dual-output conversion module, so that the control of the isolation dual-output conversion module is realized; the control block diagram of the peak value of the voltage at the first output port and the current at the input port of the isolated dual-output conversion module is shown in fig. 5.
(2) Peak value U for the first output port voltage in (1) aboveo1maxMay be replaced by a peak U for the second output port voltageo2maxControlling the sampled peak value U of the voltage of the second output porto2maxAnd a second voltage reference Uref2Comparing to obtain an error signal, and forming a current reference I controlled by the input current of the isolated dual-output conversion module after the error signal passes through the second voltage regulatorinrefFor the current control mode consistent with the above (1), a control block diagram of the peak value of the voltage at the second output port of the isolated dual-output conversion module and the current at the input port is shown in fig. 6.
(3) Real-time sampling total output voltage U of non-isolated direct current converteroTotal output voltage UoAnd a total voltage reference UorefComparing to obtain an error signal, forming a control signal of the non-isolated DC converter by the error signal through a third voltage regulator, and applying the control signal to the non-isolated DC converter to enable the output port voltage U of the non-isolated DC convertero3Can compensate first output port voltage U of isolation dual output transform moduleo1To maintain the total output voltage UoAnd a total voltage reference UorefAre equal. A control block diagram of the non-isolated dc converter controlling the total output voltage is shown in fig. 7.
The outstanding innovation and progress of the pulsed load power supply system of the invention compared with the existing solutions is represented by: creation ofThe output series structure of the dual-output converter is adopted, the current compensation idea of the bidirectional converter is changed, and the voltage is compensated. Therefore, the input current of the isolated double-output conversion module is decoupled from the pulse load current, the average power design can be realized, and the design power is far smaller than the average power due to the low output voltage of the non-isolated direct-current converter. Part of power is supplied to the pulse load through the first output port of the isolation dual-output conversion module. The power conversion stage number is reduced, and the system efficiency is improved. In addition, the non-isolated direct current converter carries out voltage compensation on the voltage of the first output port of the isolated dual-output conversion module, so that the total output voltage UoThe control is accurate, and the capacitance value of the capacitor is reduced.
In an embodiment of the present invention, the isolated dual-output conversion module is implemented by using an integrated isolated dual-output converter shown in fig. 7, and the non-isolated dc converter is implemented by a Buck converter. By adjusting the fourth and third switching tubes (S) in the isolated dual output converter shown in FIG. 74、S3) Relative to the first and second switching tubes (S)1、S2) To realize the peak value U of the voltage of the first output porto1maxAnd an input current IinThe stability of (2). By adjusting the fifth and sixth switching tubes (S) in the non-isolated DC converter shown in FIG. 85、S6) To achieve a total output voltage UoAnd (4) stabilizing.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (2)
1. A pulsed load power supply system characterized by:
the pulse load power supply system consists of an isolation dual-output conversion module and a non-isolation direct-current converter, wherein the isolation dual-output conversion module comprises an input port and two output ports, the input port and the two output ports are electrically isolated, and the two output ports are also electrically isolated;
a second output port of the isolated double-output conversion module is connected with an input port of the non-isolated direct-current converter, and an output port of the non-isolated direct-current converter is connected with the first output port in series to serve as a total output port of the system;
the implementation mode of the isolation dual-output transformation module adopts any one of the following three modes:
the first method is as follows: an integrated isolation double-output direct current converter is adopted to simultaneously provide an input port and two output ports;
the second method comprises the following steps: the method comprises the steps that a non-isolated converter and two isolated converters are combined to provide an input port and two output ports, wherein the input port of the non-isolated converter is used as the input port of an isolated double-output conversion module, the output port of the non-isolated converter is connected to the input ports of the two isolated converters, and the output ports of the two isolated converters are used as the two output ports of the isolated double-output conversion module;
the third method comprises the following steps: the method comprises the steps that two isolation converters are combined to provide an input port and two output ports, wherein the input port of one isolation converter serves as the input port of an isolation dual-output conversion module, the output port of the isolation converter is connected to the input port of the other isolation converter and serves as the second output port of the isolation dual-output conversion module, and the output port of the other isolation converter serves as the first output port of the isolation dual-output conversion module.
2. The control method of the pulse load power supply system according to claim 1, wherein the peak value U of the voltage of the first output port of the isolated dual-output conversion module is controlled by the isolated dual-output conversion moduleo1maxOr the peak value U of the second output port voltageo2maxAnd controlling the input port current IinTotal output voltage U of non-isolated DC converter control systemoThe specific control process is as follows:
(1) isolated dual-output conversion moduleSampling peak value U of first output port voltage in real timeo1maxAnd input port current IinThe peak value U of the voltage of the first output port obtained by samplingo1maxAnd a first voltage reference Uref1Comparing to obtain an error signal, and forming a current reference I controlled by the input current of the isolated dual-output conversion module after the error signal passes through the first voltage regulatorinrefInput port current I obtained by samplinginAnd a current reference IinrefComparing to obtain an error signal, forming a control signal of the isolated dual-output conversion module after the error signal passes through the current regulator, wherein the control signal acts on the isolated dual-output conversion module and is used for regulating the voltage and the input current of a first output port of the isolated dual-output conversion module, so that the control of the isolated dual-output conversion module is realized;
(2) peak value U for the first output port voltage in (1) aboveo1maxMay be replaced by a peak U for the second output port voltageo2maxControlling the sampled peak value U of the voltage of the second output porto2maxAnd a second voltage reference Uref2Comparing to obtain an error signal, and forming a current reference I controlled by the input current of the isolated dual-output conversion module after the error signal passes through the second voltage regulatorinrefThe control mode of the current is consistent with the control mode in (1);
(3) real-time sampling total output voltage U of non-isolated direct current converteroTotal output voltage UoAnd a total voltage reference UorefComparing to obtain an error signal, forming a control signal of the non-isolated DC converter by the error signal through a third voltage regulator, and applying the control signal to the non-isolated DC converter to enable the output port voltage U of the non-isolated DC convertero3Can compensate first output port voltage U of isolation dual output transform moduleo1To maintain the total output voltage UoAnd a total voltage reference UorefAre equal.
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