CN110707902A - Anti-interference circuit of power electronic transformer power module - Google Patents
Anti-interference circuit of power electronic transformer power module Download PDFInfo
- Publication number
- CN110707902A CN110707902A CN201910899541.5A CN201910899541A CN110707902A CN 110707902 A CN110707902 A CN 110707902A CN 201910899541 A CN201910899541 A CN 201910899541A CN 110707902 A CN110707902 A CN 110707902A
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- China
- Prior art keywords
- power
- module
- circuit board
- power supply
- power module
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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
- H02M1/00—Details of apparatus for conversion
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
Abstract
The invention discloses an anti-interference circuit of a power module of a power electronic transformer, wherein the power module comprises a working power supply, a module control circuit board, a driving circuit board, a power circuit formed by power electronic elements, a metal shell and a radiator.
Description
Technical Field
The invention belongs to the field of power electronics, and particularly relates to an anti-interference circuit for a power module of a medium-high voltage power electronic transformer.
Background
The medium-high voltage power electronic transformer is mainly used in the field of power distribution, and the voltage grade can be from 6kV to more than 35 kV. Medium and high voltage power electronic transformers are usually constructed from a cascade of multiple power modules, and the current mainstream topologies include H-bridge cascades (also called chains) and MMCs (also called M2C, or modular multilevel). For example, fig. 1 shows an electrical schematic diagram of a 10kV three-phase chain-link converter, in which 14 power modules are cascaded in each phase, the three phases are connected in a star connection, and the total line voltage is 10 kV.
The power module mainly comprises a metal shell, power electronic devices, direct current buses (DC1 and DC2), alternating current buses (AC1 and AC2), a heat radiator, a driving circuit board, a module control circuit board, a working power supply and the like. The working power supply mainly supplies power for the module control circuit board and the driving circuit board, and according to a specific design scheme, power supply inlet wires of the working power supply are mostly direct current buses DC1 and DC2 of the power module.
The ac output voltage of a single power module is low (hundreds of volts to thousands of volts), and a plurality of power modules can withstand high voltage (thousands of volts to hundreds of kilovolts) after being cascaded.
The power module has a plurality of parts with different grounds, and the potentials of the parts are suspended, so that the potential difference necessarily exists between the elements, as shown in fig. 2. When the power module is at a high potential, the potential difference between the internal components may be large, which easily causes interference between the components, especially interference to the module control board and the driving circuit board; at this point, appropriate immunity measures must be taken.
The most commonly used anti-interference circuits at present are: the middle points of the positive and negative direct current buses (DC1 and DC2) of the power module are led out by resistance-capacitance circuits (R1, C1, R2 and C2) and are connected with a metal shell (or a radiator) of the power module, as shown in figure 3. Because the radiator is fixed with the metal shell through bolts, the method can ensure that the voltage between the metal shell and the radiator and the positive and negative direct current buses of the power module does not exceed half of the direct current voltage. However, the method does not eliminate the floating potential of the components such as the driving circuit board, the module control circuit board, the working power supply and the like, the potential difference between the components and the metal shell cannot be effectively reduced, and the problem of electromagnetic interference still exists, which can cause the module control circuit board and the driving circuit board to work abnormally or even to have faults.
The present invention has been made in an effort to solve the above problems occurring in the prior art.
Disclosure of Invention
The invention bridges a resistance-capacitance branch (R3 and C3) between the metal shell of the power module and the grounding end of the module control circuit board to form a group of anti-interference circuits.
Parasitic charges exist between a power supply incoming line of the power module and a power module metal shell and between a power module alternating current outgoing line and the power module metal shell, and although the charge quantity of the parasitic charges is small (equivalent to a picofarad parasitic capacitor), the caused local potential variation is possibly severe and can reach several kilovolts. These changes in charge can affect the ground potential of the module control circuit board. The R3 and C3 function to absorb parasitic charges between the module control circuit board and the power module metal case, and clamp the potential difference between a series of elements such as the working power supply, the module control circuit board, the driving circuit board, the positive and negative dc buses, and the power module outgoing lines and the power module metal case to a low level. Through the above analysis, the parameters of R3 can be selected according to: the rated voltage is not lower than the direct-current voltage of the power module; after the rated voltage is determined, the selection of a specific resistance value should generally ensure that the rated power of the resistor does not exceed 20W, so the resistance value is generally between 100k Ω and 1M Ω; the parameters of C3 are selected according to the following: the rated voltage is not lower than the direct-current voltage of the power module, the rated current is several hundred milliamperes to several amperes, and the capacity value range can be considered between several hundred nanofarads and several microfarads.
The invention discloses an anti-interference circuit of a power module of a power electronic transformer, wherein the power module comprises a working power supply, a module control circuit board, a driving circuit board, a power circuit formed by power electronic components, a metal shell and a radiator, and is characterized in that a resistance-capacitance branch is bridged between the metal shell of the power module and the grounding end of the module control circuit board to form a group of anti-interference circuits, and a resistor R3 in the resistance-capacitance branch is connected with a capacitor C3 in parallel.
Preferably, in the anti-interference circuit of the power module of the power electronic transformer, the working power supply of the power module has two incoming lines, namely a power incoming line 1 and a power incoming line 2, the working power supply is connected with the module control circuit board, the module control circuit board is connected with the driving circuit board, the driving circuit board is connected with the power circuit formed by the power electronic elements, and the power circuit formed by the power electronic elements has two direct current buses DC1 and DC2 and two alternating current buses AC1 and AC 2.
Preferably, the direct current buses DC1 and DC2 of the power circuit are respectively connected to a power inlet line 1 and a power inlet line 2 of the working power supply, the working power supply is a switching power supply, and a capacitor C1 is connected between the power inlet line 2 and the metal casing of the power module.
Description of the drawings:
fig. 1 is an electrical schematic of a prior art 10kV chain-link converter;
FIG. 2 is a schematic diagram of the main components of a power module and their electrical connections in the prior art;
FIG. 3 is a schematic diagram of an anti-jamming circuit in the prior art;
FIG. 4 is an anti-jamming circuit of the power module of the power electronic transformer of the present invention;
FIG. 5 is an anti-jamming circuit of a power electronic transformer power module of an embodiment of the present invention;
the reference numerals are explained below:
A1-A14, B1-B14 and C1-C14 are all power modules;
C1、C3is a cross-over capacitor;
R3is a cross-over resistor;
DC1 and DC2 are two direct current buses of the power circuit;
AC1, AC2 are two alternating current buses of the power circuit.
Detailed Description
Example 1
Referring to fig. 5, in the present embodiment, a power module at the high-voltage incoming line end of a 10kV power electronic transformer is considered. The voltage between the direct current buses DC1 and DC2 of a single power module is 900V direct current, and the voltage between the alternating current outgoing lines AC1 and AC2 is 430V alternating current. If no anti-interference circuit exists, the potential difference between the module control circuit board and the metal shell of the power module exceeds 1kV, and the phenomenon of discharge and ignition between the module control circuit board and the metal shell of the power module can be observed, so that the circuit board works abnormally.
According to fig. 5, a resistance-capacitance branch is bridged between the metal shell of the power module and the grounding terminal of the module control board, the capacitance value of C2 is 0.47 microfarad, the rated voltage is 1.2kV, and the rated current is 1 ampere. Under the condition, the potential difference between the module control circuit board and the metal shell is close to 0, the discharge phenomenon can not occur, and the normal operation of the circuit board is ensured.
Field of application
The invention is mainly used for the power module design of the medium-high voltage power electronic transformer to improve the anti-interference performance of the module control circuit board and avoid the abnormal operation and faults caused by the drastic change of the potential difference between elements in the power module. The industrial applications involved are mainly power electronic transformers, the voltage class of which may range from 6kV to over 35 kV.
It should be understood by those skilled in the art that the foregoing description and examples of the invention are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Such obvious variations and modifications are within the scope of the present invention as expressed in the spirit of the invention.
Claims (3)
1. An anti-interference circuit of a power module of a power electronic transformer comprises a working power supply, a module control circuit board, a driving circuit board, a power circuit formed by power electronic elements, a metal shell and a radiator, and is characterized in that a resistance-capacitance branch is bridged between the metal shell of the power module and the grounding end of the module control circuit board to form a group of anti-interference circuits, and a resistor R3 in the resistance-capacitance branch is connected with a capacitor C3 in parallel.
2. The anti-interference circuit of the power module of the power electronic transformer as claimed in claim 1, wherein the working power supply of the power module has two power supply incoming lines, namely a power supply incoming line 1 and a power supply incoming line 2; the working power supply is connected with the module control circuit board, the module control circuit board is connected with the driving circuit board, and the driving circuit board is connected with a power circuit formed by power electronic elements; the power circuit formed by the power electronic element comprises two direct current buses including a direct current bus DC1 and a direct current bus DC2 and two alternating current buses including an alternating current bus AC1 and an alternating current bus AC 2.
3. The immunity circuit of a power module of a power electronic transformer as claimed in claim 2, wherein the DC buses DC1 and DC2 of the power circuit are respectively connected to the power inlet line 1 and power inlet line 2 of the working power supply, the working power supply is a switching power supply, and a capacitor C1 is connected between the power inlet line 2 and the metal housing of the power module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910899541.5A CN110707902A (en) | 2019-09-23 | 2019-09-23 | Anti-interference circuit of power electronic transformer power module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910899541.5A CN110707902A (en) | 2019-09-23 | 2019-09-23 | Anti-interference circuit of power electronic transformer power module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110707902A true CN110707902A (en) | 2020-01-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910899541.5A Pending CN110707902A (en) | 2019-09-23 | 2019-09-23 | Anti-interference circuit of power electronic transformer power module |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822740A (en) * | 2006-03-18 | 2006-08-23 | 阮树成 | Electronic ballast of high performence eliminating electromagnetic interference |
| CN101945565A (en) * | 2010-09-26 | 2011-01-12 | 镇江恒驰科技有限公司 | Anti-interference grounding method of electronic controller of automobile |
| CN202798676U (en) * | 2012-09-27 | 2013-03-13 | 宜昌市凯诺科技开发有限公司 | Low-cost DA transmitter switching circuit |
| CN103701311A (en) * | 2013-11-29 | 2014-04-02 | 清华大学 | Protection circuit of middle/high voltage current converter power module |
| CN104025439A (en) * | 2011-10-31 | 2014-09-03 | 日立汽车系统株式会社 | Power supply apparatus |
| CN206332793U (en) * | 2017-01-04 | 2017-07-14 | 北京第七九七音响股份有限公司 | Backup formula is taken one's seat microphone |
| CN208820682U (en) * | 2018-09-03 | 2019-05-03 | 辽宁宇飞高频设备有限公司 | A kind of high-frequency heat sealing machine anti-jamming circuit |
-
2019
- 2019-09-23 CN CN201910899541.5A patent/CN110707902A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822740A (en) * | 2006-03-18 | 2006-08-23 | 阮树成 | Electronic ballast of high performence eliminating electromagnetic interference |
| CN101945565A (en) * | 2010-09-26 | 2011-01-12 | 镇江恒驰科技有限公司 | Anti-interference grounding method of electronic controller of automobile |
| CN104025439A (en) * | 2011-10-31 | 2014-09-03 | 日立汽车系统株式会社 | Power supply apparatus |
| CN202798676U (en) * | 2012-09-27 | 2013-03-13 | 宜昌市凯诺科技开发有限公司 | Low-cost DA transmitter switching circuit |
| CN103701311A (en) * | 2013-11-29 | 2014-04-02 | 清华大学 | Protection circuit of middle/high voltage current converter power module |
| CN206332793U (en) * | 2017-01-04 | 2017-07-14 | 北京第七九七音响股份有限公司 | Backup formula is taken one's seat microphone |
| CN208820682U (en) * | 2018-09-03 | 2019-05-03 | 辽宁宇飞高频设备有限公司 | A kind of high-frequency heat sealing machine anti-jamming circuit |
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Application publication date: 20200117 |