CN112615547A - Automatic voltage-sharing switch network, direct current converter, control system and control method - Google Patents
Automatic voltage-sharing switch network, direct current converter, control system and control method Download PDFInfo
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- CN112615547A CN112615547A CN202011485672.8A CN202011485672A CN112615547A CN 112615547 A CN112615547 A CN 112615547A CN 202011485672 A CN202011485672 A CN 202011485672A CN 112615547 A CN112615547 A CN 112615547A
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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
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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
- H02M3/33507—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an automatic voltage-sharing switch network, a direct current converter, a control system and a control method, wherein the control system comprises the following steps: the automatic voltage-sharing switch network comprises an automatic voltage-sharing switch network, a resonant cavity circuit, a rectifying circuit and a filter circuit, wherein the automatic voltage-sharing switch network is connected with two ends of input voltage, and two ends of the filter circuit are connected with a load. The input end of the invention adopts a series connection structure, thus reducing the voltage stress of the power switch tube; in a switching period, each input voltage-sharing capacitor is connected with the adjacent input voltage-sharing capacitor in parallel for sharing voltage, so that voltage balance on the input voltage-sharing capacitors is realized under the condition of no additional input voltage-sharing control, the risk of divergence of the input voltage-sharing capacitors of the system is avoided, input voltage information of each submodule does not need to be sampled again, and the control complexity is simplified. All power switch tubes are controlled by adopting uniform switching frequency, so that the control difficulty is further reduced; all power switch tubes and high-frequency rectifier diodes realize soft switching, and the efficiency of the converter is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an automatic voltage-sharing switch network, a direct-current converter, a control system and a control method.
Background
The high-voltage direct-current transmission system has the advantages of high power density, small transmission line loss and the like, and is widely applied to occasions such as industrial power distribution networks, new energy power generation, electrified railways and the like. But is typically only a few hundred volts for the distribution network and the users. A step-down dc converter for high-voltage transmission (tens of kilovolts) and low-voltage consumption (hundreds of volts), with a high transformation ratio (i.e. a high ratio of input voltage to output voltage: e.g. a high-voltage input voltage level of tens of kilovolts and an output voltage of hundreds of volts) is one of the key devices for interconnecting different voltage levels. The direct current application occasions of high-voltage input and low-voltage output have higher requirements on the stress of devices of the converter, are limited by the technical limits of the devices, and a single converter cannot meet the requirements easily. A dc converter commonly used in such a case adopts an input-series-output parallel structure. The input-series output-parallel direct current converter is formed by connecting a plurality of sub-modules in series at an input end and in parallel at an output end. Under the condition that the electrical parameters of the sub-modules are inconsistent and the control signals are inconsistent, the voltage on the input voltage-sharing capacitor may diverge, so that the reliability of the system is reduced. In order to balance the voltage of the input voltage-sharing capacitor, extra input voltage-sharing control is often needed, the input voltage-sharing control needs to sample the input voltage information of each submodule, and because the input voltage of each submodule has a steady-state potential difference, high-insulation isolation sampling often needs to transmit a control signal to each submodule after being transmitted to a low-voltage side through an optical fiber, so that the complexity and the cost of a control system are greatly increased under the condition that the number of the submodules is large.
Disclosure of Invention
The invention aims to solve the technical problem that in order to overcome the defects of the prior art, the invention provides the automatic voltage-sharing switch network, the direct-current converter, the control system and the control method, so that the voltage balance on the input voltage-sharing capacitor is realized under the condition of no additional input voltage-sharing control.
An automatic voltage-sharing switch network comprises a plurality of half-bridge submodules connected in series; and two adjacent half-bridge sub-modules share one power switch tube.
The two adjacent half-bridge sub-modules share one power switch tube means that: the last power switch tube of the first half-bridge submodule is the first power switch tube of the second half-bridge submodule, the last switch tube of the second half-bridge submodule is the first power switch tube of the third half-bridge submodule, and so on. In the automatic voltage-sharing switch network, because two adjacent half-bridge sub-modules share one power switch tube, a plurality of direct current capacitors (namely voltage-sharing capacitors) are connected in series, and each voltage-sharing capacitor is connected with the adjacent voltage-sharing capacitor in parallel for sharing voltage in a switching period, so that the voltage balance on the voltage-sharing capacitors is realized under the condition of no additional input voltage-sharing control, and the risk of divergence of the voltage-sharing capacitors is avoided.
In order to simplify the structure, the half-bridge submodule of the invention comprises two power switching tubes connected in series, and a series branch formed by the two power switching tubes connected in series is connected with a direct current capacitor in parallel.
And all power switching tubes of all half-bridge sub-modules have the same switching frequency, so that the control difficulty is reduced.
In the invention, the serial numbers of two ends of the power switch tubes in the plurality of half-bridge submodules connected in series are sequentially set asA 1 、 A 2 ，……，A n Then, thenA i 、A j Forming an alternating current input port; wherein the content of the first and second substances,i=1，2，……，n；j=1，2，……，n；j＞iand is andjandithe difference is odd. . The automatic voltage-sharing network is convenient to use, and is convenient for flexibly configuring the proper automatic voltage-sharing switch network and the proper rectification circuit according to different design requirements and application occasions. Preferably, is prepared fromA i、A jThe voltage square wave of the alternating current input port is formed to be 1/(or) of the input voltagej-i). In practical application, the transformation ratio of the transformer of the direct current converter comprising the automatic voltage-sharing switch network can be designed according to the difference of port numbers, the input voltage and the rated output voltage.
The invention also provides a direct current converter, which comprises the automatic voltage-sharing switch network; the automatic voltage-sharing switch network is connected with at least one conversion branch; the conversion branch comprises a resonant cavity circuit; the resonant cavity circuit is connected with the rectifying circuit; all the rectifying circuits are connected to the filter circuit.
The direct current converter has the characteristic that modules can be freely combined, and can flexibly configure proper automatic voltage-sharing switch networks and rectifying circuits according to different design requirements and application occasions. The direct current converter can realize voltage balance on the input voltage-sharing capacitor under the condition of no additional input voltage-sharing control, has high reliability and low complexity, and can solve the problem that the direct current converter in the direct current application occasion of high-voltage input and low-voltage output cannot give consideration to the reliability, the low cost and the low complexity.
The rectifying circuit comprises a transformer; the primary side of the transformer is connected with the output end of the resonant cavity circuit; and the secondary side of the transformer is connected with the input end of the rectifier bridge. The rectifier circuit has simple structure, low cost and high reliability.
The output voltage of the DC converter is proportional to the transformation ratio of the transformer. The transformer ratio can be conveniently designed according to the output voltage under the rated working condition when the transformer is designed.
The modules in the dc converter of the present invention can be freely combined according to the use requirement, for example:
the number of the conversion branches is 1, and a resonant cavity circuit in each conversion branch is connected with any power switch tube in parallel; or, the number of the conversion branches is 2, and two resonant cavity circuits in the two conversion branches are respectively connected with one power switch tube in parallel; or the number of the conversion branches is 4, and four resonant cavity circuits in the four conversion branches are respectively connected with one power switch tube in parallel; or the number of the conversion branches is 1, two input ends of a resonant cavity circuit in the conversion branches are respectively connected with an alternating current input port Am and an alternating current input port Ak, wherein m =1, 2, … …, n; k =1, 2, … …, n; and m-k is not less than 3, and m-k is an odd number.
In order to meet the requirement of high power, the conversion branch circuit can be provided with a plurality of parallel rectification circuits; the input ends of all the rectification circuits are connected with the output end of the resonant cavity circuit of the conversion branch.
The invention also provides a control system of the direct current converter, which comprises a voltage-controlled oscillator; the input end of the voltage-controlled oscillator is connected with the output end of the filter circuit; and the output end of the voltage-controlled oscillator is connected with the zero-crossing comparator. The control system does not need to sample the input voltage information of each half-bridge submodule, and the control complexity is simplified.
As an inventive concept, the present invention also provides a method for controlling the dc converter, including:
when the direct current converter operates in an open loop mode, the control signals of two adjacent power switch tubes are opposite, and the switching frequency of the power switch tubesf sAnd series resonance frequencyf rThe power switch tubes operate at full duty ratio;
when the DC converter operates in frequency conversion control, the reference value of the voltage at the output port of the DC converter is reducedV refAnd feeding the voltage difference to a PI controller after the voltage difference is obtained with the voltage Vo of the output port of the step-down direct current converter, and obtaining a switching signal of the power switching tube through PI regulation.
The control method of the present invention can be realized by the control system of the present invention.
Compared with the prior art, the invention has the beneficial effects that:
1. the input end of the invention adopts a series connection structure, thus reducing the voltage stress of the power switch tube; with the switching action of the switching tube, all the input voltage-sharing capacitors and the adjacent input voltage-sharing capacitors are in parallel voltage-sharing in one switching period, so that the automatic voltage-sharing capability of the input voltage-sharing capacitors is realized, the risk of voltage divergence of the input voltage-sharing capacitors is avoided, and the reliability of the system is obviously improved;
2. the voltage-sharing control can be realized without sampling the input voltage information of each half-bridge submodule, so that the complexity and the cost of a control system are reduced;
3. all power switch tubes are controlled by adopting uniform switching frequency, so that the control difficulty is further reduced;
4. all power switching tubes and transformers realize soft switching, so that the working efficiency of the direct-current converter is improved;
5. the direct current converter has the characteristic of a complete modular structure, and can flexibly configure a proper automatic voltage-sharing switch network and a proper rectification circuit according to design requirements and application occasions.
Drawings
FIG. 1 is a schematic diagram of an automatic voltage grading switch network circuit of the present invention;
FIG. 2 is a block diagram of a DC converter configuration according to the present invention;
FIG. 3 is a schematic diagram of a rectifier circuit according to the present invention;
FIG. 4 is a circuit diagram of an automatic voltage-equalizing high-transformation-ratio voltage-reducing DC converter with 2-time voltage reduction and single-path output;
FIG. 5 is a circuit diagram of an automatic voltage-equalizing high-transformation-ratio voltage-reducing DC converter with 2-time voltage reduction and 2-path output in parallel connection;
FIG. 6 is a circuit diagram of an automatic voltage-equalizing high-transformation-ratio voltage-reducing DC converter with 2-time voltage reduction and 4-path output in parallel connection;
FIG. 7 is a circuit diagram of an automatic voltage-equalizing high-transformation-ratio voltage-reducing DC converter with 1-time voltage reduction and single-path output;
FIG. 8 is a circuit diagram of an automatic voltage-equalizing high-transformation-ratio step-down DC converter with a transformer added based on the connection mode of FIG. 4;
FIG. 9 is a schematic diagram of the operation principle of an automatic voltage-equalizing high-transformation-ratio voltage-reducing DC converter; (a)S 1，S 3the switch is closed; (b)S 2，S 4the switch is closed;
FIG. 10 is a topology control block diagram of the present invention; (a) is an open loop control block diagram; (b) is a frequency conversion control block diagram;
FIG. 11 is a simulation waveform of the 2-fold buck, single-output, automatic voltage-sharing, high-ratio buck DC converter shown in FIG. 4; (a) the switching frequency is 60 kHz; (b) the switching frequency was 48 kHz.
Detailed Description
Referring to fig. 1, the automatic voltage-sharing switch network of the present invention includes n half-bridge submodules, each of which includes two parallel branches, one of which is a series branch formed by two power switch tubes connected in series, and the other branch is a dc capacitor (voltage-sharing capacitor). For example, in fig. 1, a half-bridge submodule 1 includes a power switch transistor S1, a power switch transistor S2, and a dc capacitor C1; the power switch tube S1 and the power switch tube S2 are connected in series, and the direct current capacitor C1 is connected in parallel with a branch where the power switch tube S1 and the power switch tube S2 are located. According to the invention, two adjacent half-bridge sub-modules share one power switch tube. As can be seen from FIG. 1, half-bridge submodule 1 and half-bridge submodule 2 share power switch tube S2, and half-bridge submodule n-2 and half-bridge submodule n-1 share power switch tube Sn-1And so on.
The power switch tube can be a semiconductor electronic switch such as an IGBT, a MOSFET, an IGCT or a GTO.
A plurality of half-bridge sub-modules are connected in series to form a plurality of alternating current input ports, and the serial numbers of two ends of power switch tubes in the plurality of half-bridge sub-modules connected in series are assumed to beA 1、A 2，……，A nThen, thenA i、A jForming an alternating current input port; wherein the content of the first and second substances,i=1，2，……，n；j=1，2，……，n；j＞iand is andjandithe difference is odd. As in fig. 1A 1AndA 2、A 2andA 3、A 1andA 4and the like. From the mainA i、A jThe square wave of the voltage forming the AC input port is 1/(of) the input voltagej-i). In practical application, the transformation ratio of the transformer can be designed according to the difference between the port numbers, the input voltage and the rated output voltage.
The automatic voltage-sharing high-transformation-ratio voltage-reducing DC converter comprises an automatic voltage-sharing switch network, a resonant cavity circuit, a rectifying circuit and a filter circuit, wherein two input ends of the automatic voltage-sharing switch network are connected with an input voltage VinAnd two ends of the filter circuit are connected with a load. The invention is characterized in that the input end adopts a plurality of half-bridge sub-modules to realize the automatic voltage sharing of the input voltage-sharing capacitor, the half-bridge sub-modules are connected in series to form a plurality of alternating current input ports, each alternating current input port is connected with a resonance network, and low-voltage direct current output can be obtained through a high-frequency transformer, a rectifier bridge and a filter capacitor. All power switch tubes are controlled by the same switching frequency, and the frequency of switching signalsf sAnd series resonance frequencyf rThe same, full duty cycle operation has guaranteed all power switching tube and high frequency rectifier diode's soft switch. The output voltage of the automatic voltage-equalizing high-transformation-ratio voltage-reducing direct-current converter is in direct proportion to the transformation ratio of the high-frequency transformer. The rectifier bridge configuration may be a half-bridge or a full-bridge configuration.
The rectifier circuit structure is shown in fig. 3, the rectifier bridge structure may be a half-bridge or a full-bridge structure, and the transformer may or may not have a center tap. The transformer in this embodiment is a high frequency transformer.
Based on fig. 1, the dc transformer module of the present invention can be combined as follows according to actual usage requirements:
FIG. 4 is an embodiment of an automatic voltage-sharing high-transformation-ratio voltage-reducing DC converter with 2-time voltage reduction and single-path output;
FIG. 5 is an embodiment of an automatic voltage-sharing high-transformation-ratio voltage-reducing DC converter with 2 times of voltage reduction and 2 output circuits connected in parallel;
FIG. 6 is an embodiment of an automatic voltage-sharing high-transformation-ratio voltage-reducing DC converter with 2-fold voltage reduction and 4-output parallel connection;
FIG. 7 is a 1-fold step-down, single-output, automatic voltage-sharing, high-transformation-ratio step-down DC converter embodiment;
in addition to the embodiments of fig. 4-7, other embodiments using the connection of fig. 1 are also within the scope of the present invention.
If the high frequency transformer in fig. 4-7T 1、T 2、T 3、T 4Cannot meet the requirement of high power, a new connection scheme figure 8 can be developed on the basis of figures 4-7, namely a high-frequency transformer is newly addedT 5And originalT 1The primary windings are connected in parallel, and the secondary windings are connected in parallel. New high-frequency transformerT 6And originalT 2The primary windings are connected in parallel, and the secondary windings are connected in parallel. If a greater output current is required, a method similar to that shown in fig. 8 can be used to extend the transformers to 3 or more and correspondingly the output rectifier bridges to 3 or more.
Here, the working principle of the present invention is described by taking the automatic voltage-equalizing high-transformation-ratio step-down dc-to-dc converter with 2-fold step-down and one-way output shown in fig. 4 as an example:S 1、S 2、S 3、S 4forming an automatic voltage-sharing switch network;L r、L m、C rforming a resonant cavity circuit; the rectifying circuit can be in a half-bridge or full-bridge structure;C fis a filter capacitor;R Lis a load. When the automatic voltage-equalizing high-conversion-ratio voltage-reducing DC converter is used as shown in FIG. 9S 1，S 3After the switch is closed, the voltage-sharing capacitor is inputC 1AndC 2the two are connected in parallel,C 3andC 4and (4) connecting in parallel. When in the automatic voltage-equalizing high-transformation-ratio voltage-reducing DC converterS 2，S 4After the switch is closed, the voltage-sharing capacitor is inputC 2AndC 3the two are connected in parallel,C 4andC 5and (4) connecting in parallel. In one switching period, the input voltage-sharing capacitorC 1、C 2、C 3、C 4Are all connected with adjacent capacitors once in parallel, so that in one switching period, the voltage-sharing capacitors are inputC 1、C 2、C 3、C 4The capacitor voltages can be balanced.
Referring to the control method of the automatic voltage-equalizing high-conversion-ratio voltage-reducing direct-current converter shown in fig. 10, the (a) is an open-loop control block diagram, the switching signals of adjacent power switching tubes are complementary, and the switching frequency is the same as the series resonance frequency of the resonance network. (b) For frequency conversion control block diagram, by using reference value of output port voltageV refAnd the output port voltage obtained by samplingV oAnd sending the difference to a PI controller to obtain a reference value of the voltage-controlled oscillator, changing the output frequency of the voltage-controlled oscillator by selecting a proper reference frequency and a proper voltage-frequency sensitivity coefficient, and connecting the output of the voltage-controlled oscillator with a zero comparator to obtain a switching signal of the power switching tube. The reference frequency should be close to the series resonance frequency (for example, the reference frequency is selected to be 80% to 95% of the series resonance frequency). The higher the voltage-frequency sensitivity coefficient is, the higher the dynamic regulation speed of the converter is, but the output voltage may fluctuate severely in a short time; the smaller the voltage-frequency sensitive coefficient is, the slower the dynamic regulation speed of the converter is, and the output voltage changes smoothly. Reference values for voltages at different loads and different output portsV refIn this case, the controller may implement the non-settling tracking of the output voltage by output voltage closed-loop control.
Fig. 11 is a simulation waveform of the automatic voltage-equalizing high-transformation-ratio step-down dc-dc converter with 2-time step-down and single-path output shown in fig. 4, and simulation parameters are designed as follows: input voltageV in= 1000V, input voltage equalizing capacitorC 1 = C 2 = C 3 = 110μF, the resonant inductance isL r = 4.5μH, resonant capacitance ofC r = 1.67μF, excitation inductance ofL m = 29μH. The transformation ratio of the high-frequency transformer is 1:1, and the output filter capacitorC f = 220μF, loadR L = 20Ω。
In fig. 11 (a), the switching frequency is 60kHz, the duty cycle is full, and the output voltage is 250V at this time. I (S1), I (S2), I (S3) and I (S4) are switching tubes, respectivelyS 1、S 2、S 3、S 4The current waveforms of (I) (Lr1) and (I (Lm1) are respectively flowing through the resonance inductorL rAnd excitation inductanceL mThe current of VC1, VC2 and VC3 are input voltage-sharing capacitors respectivelyC 1、C 2、C 3The voltage of (c). From simulation results, the input voltage-sharing capacitorC 1、C 2、C 3The voltage fluctuation of the voltage does not exceed 1V, and automatic voltage equalization can be realized.
In fig. 11 (b), the switching frequency is 48kHz, the duty cycle is full, and the output voltage is 290V at this time. I (S1), I (S2), I (S3) and I (S4) are switching tubes, respectivelyS 1、S 2、S 3、S 4The current waveforms of (I) (Lr1) and (I (Lm1) are respectively flowing through the resonance inductorL rAnd excitation inductanceL mThe current of VC1, VC2 and VC3 are input voltage-sharing capacitors respectivelyC 1、C 2、C 3The voltage of (c). From simulation results, the input voltage-sharing capacitorC 1、C 2、C 3The voltage fluctuation of the voltage does not exceed 1V, and automatic voltage sharing can still be realized.
Claims (10)
1. An automatic voltage-sharing switch network comprises a plurality of half-bridge submodules connected in series; the power switching tube is characterized in that two adjacent half-bridge sub-modules share one power switching tube.
2. The automatic voltage-sharing switch network according to claim 1, wherein the half-bridge submodule comprises two power switch tubes connected in series, and a series branch of the two power switch tubes connected in series is connected in parallel with a direct current capacitor.
3. The automatic voltage-sharing switch network according to claim 1 or 2, characterized in that all power switching tubes of all half-bridge sub-modules have the same switching frequency.
4. The automatic voltage-sharing switch network according to claim 1 or 2, wherein the numbers of the two ends of the power switch tube in the plurality of series-connected half-bridge submodules are sequentiallyA 1 、A 2 ，……，A n Then, thenA i 、A j Forming an alternating current input port; wherein the content of the first and second substances,i=1，2，……，n；j=1，2，……，n；j＞iand is andjandithe difference is odd; preferably, is prepared fromA i、A jThe voltage square wave of the alternating current input port is formed to be 1/(or) of the input voltagej-i)。
5. A DC converter comprising an automatic voltage grading switch network according to any of claims 1 to 4; the automatic voltage-sharing switch network is connected with at least one conversion branch; the conversion branch comprises a resonant cavity circuit; the resonant cavity circuit is connected with the rectifying circuit; all the rectifying circuits are connected to the filter circuit.
6. The dc converter according to claim 5, wherein the rectifying circuit includes a transformer; the primary side of the transformer is connected with the output end of the resonant cavity circuit; the secondary side of the transformer is connected with the input end of the rectifier bridge; preferably, the output voltage of the dc converter is proportional to the transformation ratio of the transformer.
7. The direct current converter according to claim 5, wherein the number of the conversion branches is 1, and a resonant cavity circuit in the conversion branch is connected with any power switch tube in parallel; alternatively, the first and second electrodes may be,
the number of the conversion branches is 2, and two resonant cavity circuits in the two conversion branches are respectively connected with one power switch tube in parallel; alternatively, the first and second electrodes may be,
the number of the conversion branches is 4, and four resonant cavity circuits in the four conversion branches are respectively connected with one power switch tube in parallel; alternatively, the first and second electrodes may be,
the number of the conversion branches is 1, two input ends of a resonant cavity circuit in each conversion branch are respectively connected with an alternating current input port Am and an alternating current input port Ak, wherein m =1, 2, … …, n; k =1, 2, … …, n; and m-k is not less than 3, and m-k is an odd number.
8. The dc converter according to claim 6 or 7, wherein the conversion branch comprises a plurality of parallel rectification circuits; the input ends of all the rectification circuits are connected with the output end of the resonant cavity circuit of the conversion branch.
9. A control system for a dc converter as claimed in any one of claims 5 to 9, comprising a voltage controlled oscillator; the input end of the voltage-controlled oscillator is connected with the output end of the filter circuit; the output end of the voltage-controlled oscillator is connected with the zero-crossing comparator; preferably, the reference value of the voltage at the output port of the DC converterV refAnd the voltage of the output port of the DC converter obtained by samplingV oAnd sending the difference to a PI controller to obtain a reference value of the voltage-controlled oscillator, selecting a reference frequency and a voltage-frequency sensitive coefficient, changing the output frequency of the voltage-controlled oscillator, and connecting the output of the voltage-controlled oscillator with a zero comparator to obtain a switching signal of the power switching tube.
10. A control method of the DC converter according to any one of claims 5 to 8, comprising:
when the direct current converter operates in an open loop mode, the control signals of two adjacent power switch tubes are opposite, and the switching frequency of the power switch tubesf sAnd series resonance frequencyf rThe power switch tubes operate at full duty ratio;
when the DC converter operates in frequency conversion control, the reference value of the voltage at the output port of the DC converter is reducedV refAnd the voltage of the output port of the step-down DC converter obtained by samplingV oAfter making differenceAnd sending the signal to a PI controller, and obtaining a switching signal of the power switching tube through PI regulation.
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| CN113193752A (en) * | 2021-04-20 | 2021-07-30 | 华中科技大学 | DC transformer input voltage balance control method based on model prediction |
| CN113572362A (en) * | 2021-07-27 | 2021-10-29 | 湖南大学 | Voltage-sharing capacitor regulator for input series structure and control method thereof |
| CN113659852A (en) * | 2021-07-27 | 2021-11-16 | 广东志成冠军集团有限公司 | Switch capacitor resonance voltage-multiplying rectification converter and control method and control system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113193752A (en) * | 2021-04-20 | 2021-07-30 | 华中科技大学 | DC transformer input voltage balance control method based on model prediction |
| CN113193752B (en) * | 2021-04-20 | 2023-10-20 | 华中科技大学 | Model prediction-based direct-current transformer input voltage balance control method |
| CN113572362A (en) * | 2021-07-27 | 2021-10-29 | 湖南大学 | Voltage-sharing capacitor regulator for input series structure and control method thereof |
| CN113659852A (en) * | 2021-07-27 | 2021-11-16 | 广东志成冠军集团有限公司 | Switch capacitor resonance voltage-multiplying rectification converter and control method and control system thereof |
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| CN114094867A (en) * | 2021-11-24 | 2022-02-25 | 山东大学 | Fractal power converter and construction method thereof |
| CN114094867B (en) * | 2021-11-24 | 2023-11-17 | 山东大学 | Fractal power converter and construction method thereof |
| US12027996B2 (en) | 2021-11-24 | 2024-07-02 | Shandong University | Fractal power converter and method for constructing fractal power converter |
| CN113890380A (en) * | 2021-12-02 | 2022-01-04 | 深圳市能效电气技术有限公司 | DC-DC conversion circuit |
| CN113890380B (en) * | 2021-12-02 | 2022-03-11 | 深圳市能效电气技术有限公司 | DC-DC conversion circuit |
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