CN110635481A - Combined transformer power supply structure - Google Patents

Combined transformer power supply structure Download PDF

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Publication number
CN110635481A
CN110635481A CN201911085142.1A CN201911085142A CN110635481A CN 110635481 A CN110635481 A CN 110635481A CN 201911085142 A CN201911085142 A CN 201911085142A CN 110635481 A CN110635481 A CN 110635481A
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CN
China
Prior art keywords
power
phase
terminal
transformer
transmission line
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Pending
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CN201911085142.1A
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Chinese (zh)
Inventor
易东
李群湛
黄小红
解绍锋
郭锴
张丽艳
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Southwest Jiaotong University
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Southwest Jiaotong University
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Priority to CN201911085142.1A priority Critical patent/CN110635481A/en
Publication of CN110635481A publication Critical patent/CN110635481A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/14—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion between circuits of different phase number
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

The invention discloses a power supply structure of a combined transformer, and relates to the technical field of power supply and distribution of a power grid. A single-phase transformer T1 and a three-phase transformer T2 are connected to form a single three-phase combined transformer, the input side of a single-phase transformer T1 is connected with the power transmission line, a u terminal in the output port of the single-phase transformer T1 is connected with a b-phase line on the three-phase output side of the three-phase transformer T2, and a v terminal in the output port of a single-phase transformer T1 is connected with a c-phase line on the three-phase output side of the three-phase transformer T2; the input end of a three-phase transformer T2 in the single three-phase combined transformer is connected with the output end of the power converter; the B terminal and the C terminal in the single three-phase combined transformer are respectively connected with the M terminal and the N terminal in the output port of the power converter, and the A terminal in the single three-phase combined transformer is connected with a power transmission line; and the three-phase port of the single three-phase combined transformer is used as an output port to provide a three-phase power supply for a user.

Description

Combined transformer power supply structure
Technical Field
The invention relates to the technical field of power supply and distribution of a power grid.
Background
In the ac power supply system of the power system, a three-phase ac power supply system is widely used. In the field of low-voltage power distribution in China, single-phase power transmission lines are generally erected to provide electric energy for users, users are geographically dispersed in partial regions, and a two-phase power transmission line mode is also adopted to provide electric energy for users. When a user who only accesses a single-phase or two-phase power transmission line needs to use a three-phase power supply, according to the prior art, only the three-phase power transmission line can be re-erected to provide the three-phase power supply for the user, and the method is long in time consumption, high in cost and low in economical efficiency.
Meanwhile, the transmission line is generally erected outdoors, so that the regional span is wide, the environmental conditions are variable, and various line breakage faults are generated due to the long-term mechanical force, the action of electromagnetic force, the thermal effect, serious oxidation, poor contact and the like, so that the equipment cannot normally operate. When the original three-phase transmission line has one or two-phase line break faults due to external reasons, the three-phase power supply mode is changed into a non-three-phase power supply mode, so that a three-phase power supply required by a user cannot be provided for the user. The existing solution can only provide a three-phase power supply in a short time through the economic rush repair of power maintenance personnel, and has great danger when the rescue is carried out in severe weather, so that the personal safety of the power maintenance personnel is difficult to ensure.
If the single-phase or two-phase power transmission line can be converted into a three-phase power supply mode through a simpler power equipment structure under the condition that the power quality of a power grid is allowed, a user can obtain a three-phase power supply at a lower cost in a shorter time, the cost input of a power transmission facility can be saved, the emergency supply of the three-phase power supply can be realized when the three-phase power transmission line is broken, the emergency maintenance of power maintenance personnel under the severe environment condition is avoided, and the personal safety of the power maintenance personnel is guaranteed.
Disclosure of Invention
The invention aims to provide a combined transformer power supply structure which can effectively solve the technical problem of providing three-phase power supply through a single-phase or two-phase power transmission line.
The purpose of the invention is realized by the following technical scheme: a combined transformer power supply structure comprises a power transmission line connected with a power grid, a power converter connected with a single-phase transformer, wherein the input end of the power converter is connected with the power transmission line, the single-phase transformer T1 and a three-phase transformer T2 are connected to form a single three-phase combined transformer, the input side of a single-phase transformer T1 in the single three-phase combined transformer is connected with the power transmission line, a u terminal in the output port of a single-phase transformer T1 is connected with a b-phase line on the three-phase output side of a three-phase transformer T2, and a v terminal in the output port of a single-phase transformer T1 is connected with a c-phase line on the three; the input end of a three-phase transformer T2 in the single three-phase combined transformer is connected with the output end of the power converter; the B terminal and the C terminal in the single three-phase combined transformer are respectively connected with the M terminal and the N terminal in the output port of the power converter, and the A terminal in the single three-phase combined transformer is connected with the power transmission line; and the three-phase port of the single three-phase combined transformer is used as an output port to provide a three-phase power supply for a user.
When the power transmission line is a single-phase power transmission line, a P terminal in the input end of the power converter is connected with the power transmission line, and a Q terminal in the input end of the power converter is grounded GND; the K terminal in the single three-phase combined transformer is grounded GND.
When the power transmission line is a two-phase power transmission line, the P terminal and the Q terminal in the input end of the power converter are respectively connected with the A-phase power transmission line L in the power transmission lineAB phase transmission line LBConnecting; a terminal and K terminal in single three-phase combined transformer are respectively connected with A phase transmission line L in transmission lineAB phase power transmission line LBAre connected.
The power converter comprises a first high-power switching device SVG1 on a rectifying side, a second high-power switching device SVG2 on an inverting side, a direct-current energy storage capacitor Ca and a pulse width modulator, wherein the first high-power switching device SVG1 and the second high-power switching device SVG2 are connected in series, and the direct-current energy storage capacitor Ca is connected between connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 and used for providing voltage support between an emitter and a collector of the first high-power switching device and the second high-power switching device; the output end of the pulse width modulator is respectively connected with the control electrodes of the first high-power switching device SVG1 and the second high-power switching device SVG 2. The pulse width modulator controls the first high-power switching device SVG1 and the second high-power switching device SVG2 through control poles thereof.
The input current of a first high-power switching device SVG1 of the power converter is equal to one half of the input current in the power transmission line; input voltage U between B terminal and C terminal in three-phase transformer T2BAnd the input voltage U between the A terminal and the K terminal of the single-phase transformer T1AEqual in magnitude and 90 degrees in phase to each other.
The first high-power switching device SVG1 comprises four high-power transistors BG, and the control electrode of each high-power transistor BG is connected with a pulse width modulator; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups, the emitters of the two groups of high-power transistor groups are connected in pairs, and the collectors of the two groups of high-power transistor groups are also connected in pairs; the series points of the emitters and the collectors in the two groups of high-power transistor groups form a P terminal and a Q terminal of a current input end of a first high-power switching device SVG 1.
The second high-power switching device SVG2 comprises four high-power transistors BG, and the pulse width modulator controls each high-power transistor BG through a control electrode of the transistor; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups, the emitters of the two groups of high-power transistor groups are connected in pairs, and the collectors of the two groups of high-power transistor groups are also connected in pairs; the series points of the emitters and the collectors in the two groups of high-power transistor groups form an M terminal and an output end N terminal of a current output end of a second high-power switching device SVG 2.
The high-power transistor BG adopts an integrated gate commutated thyristor or an insulated gate bipolar transistor.
Compared with the prior art, the technology of the invention has the beneficial effects that:
the method comprises the following steps that firstly, in a place where only a single-phase power transmission line with a neutral point grounded is erected in a power distribution network, as a three-phase power supply is needed in an emergency and the erection time of a new three-phase line is not allowed, under the condition that the power quality of the power distribution network is allowed, the three-phase power supply can be provided through the power supply structure;
secondly, in the place where only two-phase transmission lines are erected in the power distribution network, because three-phase power is needed in an emergency and the time for erecting a new three-phase line is not allowed, under the condition that the power quality of the power grid is allowed, the three-phase power can be provided through the power supply structure;
and thirdly, when one phase or two phases of the three-phase user are disconnected, and the maintenance environment is severe at that time, three-phase electric energy can be provided by the method, and the line is maintained after the weather environment is improved, so that potential safety hazards possibly existing in outdoor emergency repair of power maintenance personnel are reduced, and the possibility of larger accidents caused by emergency situations is also reduced.
Fourthly, the structure is simple, the universality is good, the economical efficiency is good, and the implementation is easy.
Drawings
Fig. 1 is a schematic diagram of a basic structure of the power supply structure according to the first embodiment of the present invention.
Fig. 2 is a connection diagram of a specific structure of the power supply structure according to the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the power converter according to the first embodiment of the present invention.
Fig. 4 is a connection diagram of a second specific structure according to an embodiment of the present invention.
Fig. 5 is a flow chart of the pulse width modulator control of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The basic working principle of the power supply structure of the invention is as follows: the pulse width modulator (pulse width modulator) is adopted, the digital output of the microprocessor is utilized to carry out an analog control mode on the analog circuit, and the pulse width modulator can modulate the bias of a transistor base electrode or an MOS tube grid electrode according to the change of corresponding load to realize the change of the conduction time of the transistor or the MOS tube, thereby realizing the change of the output of the switching stabilized voltage power supply.
Let the current of the transmission line 1 be I, the input current I of the A terminal in the single three-phase combined transformer 21The input current of the first high-power switching device SVG1 is I2The input voltage between the A terminal and the K terminal in the single three-phase combined transformer 2 is UAThe input voltage between the terminal B and the terminal C of the single-three phase combined transformer 2 is UB(ii) a Control of input current I of first high-power switching device SVG1 in power converter 3 by pulse width modulator2Is a transmission line LAIs one half of the current I of (a); input voltage U between B terminal and C terminal of three-phase transformer T2BAnd an input voltage U between the A terminal and the K terminal of the single-phase transformer T1AEqual in size and 90 degrees in phase with each other, the three-phase side of the single three-phase combined transformer 2 is operated by providing a symmetrical three-phase power supply for a load requiring three-phase power.
Example one
As shown in fig. 1, the embodiment of the present invention provides a combined transformer power supply configuration, which mainly includes a power transmission line 1, a single three-phase combined transformer 2 and a power converter 3. The power transmission line 1 is used for carrying out current transmission on a single three-phase combined transformer 2 and a power converter 3; the single-three phase combined transformer 2 is composed of a single-phase transformer T1 and a three-phase transformer T2 according to the connection mode of figure 2, and is used for transforming and phase modulating the current provided by the power transmission line 1 and the power converter 3 and then providing a symmetrical three-phase power supply for users; the power converter 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the single three-phase combined transformer 2; the power transmission line 1 is respectively connected with a power converter 3 and a single three-phase combined transformer 2, the power converter 3 is connected with the single three-phase combined transformer 2, and the three-phase side of the single three-phase combined transformer 2 provides three-phase power for users.
As shown in fig. 2 and 3, the neutral point is connectedThe 220V power transmission line 1 of the ground power grid is a single-phase power transmission line and the current is I, and the power transmission line 1 is respectively connected to an A terminal in a single three-phase combined transformer 2 and a P terminal of a power converter 3; the current magnitude of the A terminal of the power transmission line 1 input into the single three-phase combined transformer 2 is I1The magnitude of the current input to the P terminal of the power converter 3 is I2(ii) a The K terminal in the single three-phase combined transformer 2 is grounded GND; the power converter 3 comprises a first high-power switching device SVG1 serving as a rectifying side and a second high-power switching device SVG2 serving as an inverting side, the first high-power switching device SVG1 and the second high-power switching device SVG2 are connected in series, and a direct-current energy storage capacitor Ca is arranged between the connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 in parallel; the direct current energy storage capacitor Ca is used for providing voltage support for the emitter and the collector of the first high-power switching device and the second high-power switching device; the control electrodes of the first high-power switching device SVG1 and the second high-power switching device SVG2 are both connected with the pulse width modulator 4; a Q terminal of the power converter 3 is grounded GND, and an M terminal and an N terminal of an output end (also an output end of the power converter 3) of the second high-power switching device SVG2 are respectively and correspondingly connected with a B terminal and a C terminal of the three-phase transformer 2; the three-phase sides a, b and c of the single three-phase combined transformer 2 provide three-phase symmetrical power supply for users.
FIG. 5 is a pulse width modulator control flow diagram in which the input current I of the first high power switching device SVG1 in the power converter 32Is a transmission line LAIs one half of the current I of (a); input voltage U between B terminal and C terminal in three-phase transformer T2BAnd the input voltage U between the A terminal and the K terminal of the single-phase transformer T1AEqual in magnitude and 90 in phase with each other.
In the embodiment of the invention, the first high-power switching device SVG1 comprises four high-power transistors BG, and a control electrode of each high-power transistor BG is connected with an output end of the pulse width modulator 4; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups; emitters which are not connected in series in the two groups of high-power transistors in the first high-power switching device SVG1 are connected, and collectors which are not connected in series in the two groups of high-power transistors in the first high-power switching device SVG1 are connected.
In the embodiment of the invention, the second high-power switching device SVG2 has the same structure as the first high-power switching device SVG1, the second high-power switching device SVG2 comprises four high-power transistors BG, and the control electrode of each high-power transistor BG is connected with the output end of the pulse width modulator 4; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups; the series points of the emitting electrodes and the collecting electrodes in the two groups of high-power transistor groups form a current output end M terminal and an output end N terminal of a second high-power switching device SVG 2; emitters which are not connected in series in two groups of high-power transistors in the second high-power switching device SVG2 are connected, and collectors which are not connected in series in two groups of high-power transistors in the second high-power switching device SVG2 are connected.
The high-power transistor BG shown in fig. 4 is an integrated gate commutated thyristor IGCT; in practical implementation, an insulated gate bipolar transistor IGBT may also be used.
Example two
The power supply structure of the combined transformer according to the embodiment of the present invention is the same as the basic structure of the first embodiment of the present invention, that is, as shown in fig. 1, the power supply structure mainly includes a power transmission line 1, a single three-phase combined transformer 2 and a power converter 3. The power transmission line 1 is used for carrying out current transmission on a single three-phase combined transformer 2 and a power converter 3; the single three-phase combined transformer 2 is used for transforming and phase-modulating the current provided by the power transmission line 1 and the power converter 3 and then providing a symmetrical three-phase power supply for users; the power converter 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the single three-phase combined transformer 2; the power transmission line 1 is respectively connected with a power converter 3 and a single three-phase combined transformer 2, the power converter 3 is connected with the single three-phase combined transformer 2, and the single three-phase combined transformer 2 provides three-phase power for users.
In the embodiment of the present invention, the structures of the first high-power switching device SVG1, the second high-power switching device SVG2, and the dc energy storage capacitor Ca in the power converter 3, and the connection manner among the three are completely the same as the structure shown in fig. 3 in the first embodiment of the present invention, and therefore, the description thereof is omitted.
In the embodiment of the invention, the high-power transistor BG in the embodiment of the invention is an integrated gate commutated thyristor IGCT; in practical implementation, the high-power transistor BG may also adopt an insulated gate bipolar transistor IGBT.
Referring to fig. 2 and 4, a combined transformer power supply structure according to an embodiment of the present invention is different from the first embodiment of the present invention in that the power transmission line 1 according to the embodiment of the present invention is a two-phase power transmission line; l in two-phase transmission linesA、LBA voltage of 220kV, an input current of I in the power transmission line 1, and an A-phase power transmission line L in the power transmission line 1ARespectively connected to the A terminal of the single-three phase combined transformer 2 and the P terminal of the power converter 3, and the current input to the A terminal of the single-three phase combined transformer 2 is I1The magnitude of the current input to the P terminal of the power converter 3 is I2(ii) a B-phase transmission line L in transmission line 1BA K terminal in the single three-phase combined transformer 2 and a Q terminal of the power converter 3 are respectively connected; the power converter 3 comprises a first high-power switching device SVG1 serving as a rectifying side and a second high-power switching device SVG2 serving as an inverting side, a direct-current energy storage capacitor Ca is arranged between connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 in parallel and used for providing voltage support for an emitter and a collector of the first high-power switching device and the second high-power switching device, and the first high-power switching device SVG1 and a control electrode of an output end are both connected with an output end of the pulse width modulator 4; the output end of the second high-power switch device, namely the M terminal and the N terminal of the power converter 3 are respectively and correspondingly connected with the B terminal and the C terminal in the single three-phase combined transformer 2; the three-phase sides a, b and c of the single three-phase combined transformer 2 provide three-phase symmetrical power supply for users.
Wherein, the input current I of the first high-power switch device SVG1 in the power converter 32Is a transmission line LAIs one half of the current I of (a); second single phaseInput voltage U between terminal B and terminal C in transformer T2BAnd an input voltage U between the A terminal and the K terminal of the first single-phase transformer T1AEqual in magnitude and 90 degrees in phase to each other.

Claims (8)

1. A modular transformer power supply configuration comprising a transmission line (1) connected to a power network, a power converter (3) connected to a single-phase transformer, the input of said power converter (3) being connected to the transmission line (1), characterized in that: a single three-phase combined transformer (2) is formed by connecting a single-phase transformer T1 and a three-phase transformer T2, the input side of a single-phase transformer T1 in the single three-phase combined transformer (2) is connected with the power transmission line (1), a u terminal in the output port of the single-phase transformer T1 is connected with a b-phase line on the three-phase output side of the three-phase transformer T2, and a v terminal in the output port of the single-phase transformer T1 is connected with a c-phase line on the three-phase output side of the three-phase transformer T2; the input end of a three-phase transformer T2 in the single three-phase combined transformer (2) is connected with the output end of the power converter (3); the B terminal and the C terminal in the single three-phase combined transformer (2) are respectively connected with the M terminal and the N terminal in the output port of the power converter (3), and the A terminal in the single three-phase combined transformer (2) is connected with the power transmission line (1); and the three-phase port of the single three-phase combined transformer (2) is used as an output port to provide three-phase power for users.
2. The modular transformer power supply architecture of claim 1, wherein: when the power transmission line (1) is a single-phase power transmission line, a P terminal in the input end of the power converter (3) is connected with the power transmission line (1), and a Q terminal in the input end of the power converter is grounded GND; the K terminal in the single three-phase combined transformer (2) is grounded GND.
3. The modular transformer power supply architecture of claim 1, wherein: when the power transmission line (1) is a two-phase power transmission line, the P terminal and the Q terminal in the input end of the power converter (3) are respectively connected with the A-phase power transmission line L in the power transmission line (1)AB phase transmission line LBConnecting; a terminal and K terminal in single three-phase combined transformer (2)Respectively connected with the A-phase power transmission line L in the power transmission line (1)AB phase power transmission line LBAre connected.
4. A modular transformer supply configuration according to claim 2 or 3, characterized in that: the power converter (3) comprises a first high-power switching device SVG1 on a rectifying side, a second high-power switching device SVG2 on an inverting side, a direct-current energy storage capacitor Ca and a pulse width modulator (4), wherein the first high-power switching device SVG1 and the second high-power switching device SVG2 are connected in a back-to-back mode, and the direct-current energy storage capacitor Ca is connected between connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 and used for providing voltage support between an emitter and a collector of the first high-power switching device and the second high-power switching device; the output end of the pulse width modulator (4) is respectively connected with the control electrodes of the first high-power switching device SVG1 and the second high-power switching device SVG 2.
5. A modular transformer power supply configuration according to claim 2, wherein: the input current of a first high-power switching device SVG1 of the power converter (3) is equal to one half of the input current of the power transmission line (1); input voltage U between B terminal and C terminal in three-phase transformer T2BAnd the input voltage U between the A terminal and the K terminal of the single-phase transformer T1AEqual in magnitude and 90 degrees in phase to each other.
6. The modular transformer power supply architecture of claim 5, wherein: the first high-power switching device SVG1 comprises four high-power transistors BG, and the pulse width modulator (4) is controlled by a control electrode of each high-power transistor BG; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups, the emitters of the two groups of high-power transistor groups are connected in pairs, and the collectors of the two groups of high-power transistor groups are also connected in pairs; the series points of the emitters and the collectors in the two groups of high-power transistor groups form a P terminal and a Q terminal of a current input end of a first high-power switching device SVG 1.
7. A combined transformer supply configuration according to claim 5, characterized in that said second high power switching device SVG2 comprises four high power transistors BG, the control electrode of each high power transistor BG is connected to a pulse width modulator (4); every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups, the emitters of the two groups of high-power transistor groups are connected in pairs, and the collectors of the two groups of high-power transistor groups are also connected in pairs; the series points of the emitters and the collectors in the two groups of high-power transistor groups form an M terminal of a current output end and an N terminal of an output end of a second high-power switching device SVG 2.
8. The combined transformer power supply structure as claimed in claim 5, wherein the high power transistor BG employs an integrated gate commutated thyristor or an insulated gate bipolar transistor.
CN201911085142.1A 2019-11-08 2019-11-08 Combined transformer power supply structure Pending CN110635481A (en)

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Application Number Priority Date Filing Date Title
CN201911085142.1A CN110635481A (en) 2019-11-08 2019-11-08 Combined transformer power supply structure

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Application Number Priority Date Filing Date Title
CN201911085142.1A CN110635481A (en) 2019-11-08 2019-11-08 Combined transformer power supply structure

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CN110635481A true CN110635481A (en) 2019-12-31

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