WO2021207893A1 - Transformateur, appareil de transformation et procédé de transformation - Google Patents

Transformateur, appareil de transformation et procédé de transformation Download PDF

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Publication number
WO2021207893A1
WO2021207893A1 PCT/CN2020/084533 CN2020084533W WO2021207893A1 WO 2021207893 A1 WO2021207893 A1 WO 2021207893A1 CN 2020084533 W CN2020084533 W CN 2020084533W WO 2021207893 A1 WO2021207893 A1 WO 2021207893A1
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WO
WIPO (PCT)
Prior art keywords
transformer
metal
metal conductor
circuit
section
Prior art date
Application number
PCT/CN2020/084533
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English (en)
Chinese (zh)
Inventor
刘佩甲
赵德琦
吴壬华
Original Assignee
深圳欣锐科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳欣锐科技股份有限公司 filed Critical 深圳欣锐科技股份有限公司
Priority to CN202080004069.5A priority Critical patent/CN112514013A/zh
Priority to PCT/CN2020/084533 priority patent/WO2021207893A1/fr
Publication of WO2021207893A1 publication Critical patent/WO2021207893A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F2027/408—Association with diode or rectifier

Definitions

  • This application relates to the field of electric vehicle charging technology, and in particular to a transformer, a voltage transformation device, and a voltage transformation method.
  • On-board chargers are devices that charge on-board power batteries. In power transmission, transformers are often required to isolate and transmit energy.
  • the transformer in order to solve the heat dissipation problem, the transformer is placed in a metal casing, and the heat of the transformer is quickly transferred through the metal casing.
  • the magnetic core of the transformer will generate a coupling voltage, and the coupling voltage on the magnetic core of the transformer will arc and discharge the metal shell, which will affect the performance of the on-board charger.
  • the present application provides a transformer, a voltage transformation device and a voltage transformation method, which solves the problem of arc discharge between the magnetic core of the transformer and the metal shell, and optimizes the performance of the on-board charger.
  • the first aspect of the present application provides a transformer, the transformer is placed in a groove made of a metal shell, and the metal shell is grounded;
  • the transformer includes a transformer circuit, and the transformer circuit includes a transformer core;
  • the input end of the transformation circuit is connected to a power source, and the output end of the transformation circuit is connected to a low-voltage battery;
  • the transformer core is connected to a metal conductor
  • the metal shell is connected to the metal conductor
  • the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal shell.
  • the transformer further includes a rectifier circuit
  • the output terminal of the transformer circuit is connected to the input terminal of the rectifier circuit, and the transformer circuit is used to conduct the output current of the power supply to the rectifier circuit;
  • the output terminal of the rectifier circuit is connected to the low-voltage battery, and the rectifier circuit is used to rectify the output current of the transformer circuit.
  • the transformer circuit further includes a primary coil and a secondary coil, and the primary coil and the secondary coil are wound on the transformer core;
  • the primary coil is connected to the power source
  • the first output terminal of the secondary coil is connected to the input terminal of the rectifier circuit.
  • the rectifier circuit includes a diode and a capacitor
  • the anode of the diode is connected to the first output terminal of the secondary coil
  • the cathode of the diode is connected to the first end of the capacitor and the low-voltage battery.
  • the transformer core is grounded through the metal conductor.
  • the metal conductor includes a first section, a second section, and a third section;
  • the first end of the transformer core is connected to the first section of the metal conductor
  • the first side of the metal shell is connected to the second section of the metal conductor
  • the second side of the metal shell is connected to the third section of the metal conductor.
  • the metallic conductor includes a first metallic conductor and a second metallic conductor, the first metallic conductor includes a first section and a second section, and the second metallic conductor includes a first section and a second section. part;
  • the first end of the transformer core is connected to the first section of the first metal conductor
  • the first side of the metal shell is connected to the second section of the first metal conductor
  • the first end of the transformer core is connected to the first section of the second metal conductor
  • the second side of the metal shell is connected to the second section of the second metal conductor
  • the first metal conductor and the second metal conductor are used for conducting the coupling voltage generated by the transformer core to the metal casing.
  • a second aspect of the present application provides a voltage transformation device, including the transformer described in the first aspect of the present application.
  • a third aspect of the present application provides a voltage transformation method, which is applied to the transformer described in the first aspect of the present application or the voltage transformation device described in the second aspect of the present application, the transformer is placed in a groove made of a metal shell, The metal shell is grounded, the transformer includes a transformer circuit, and the transformer circuit includes a transformer core;
  • the transformer core is connected to a metal conductor, and the metal shell is connected to the metal conductor, and the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal shell.
  • the transformer is placed in a groove made of a metal shell, the metal shell is grounded, the transformer includes a transformer circuit, the transformer circuit includes a transformer core, the input terminal of the transformer circuit is connected to the power source, and the output terminal of the transformer circuit
  • the low-voltage battery is connected, the transformer core is connected to a metal conductor, and the metal casing is connected to a metal conductor.
  • the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal casing.
  • the magnetic core generates a coupling voltage, and the coupling voltage on the magnetic core can be conducted to the metal casing through the metal conductor.
  • the magnetic core and the metal casing are equipotential, thus avoiding arcing discharge between the magnetic core and the metal casing, and solving the magnetic problem of the transformer.
  • the problem of arc discharge between the core and the metal shell optimizes the performance of the on-board charger.
  • Fig. 1 is a schematic diagram of a transformer provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of another transformer provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of the transformer circuit shown in FIG. 2;
  • FIG. 4 is a schematic diagram of the rectifier circuit shown in FIG. 2;
  • FIG. 5 is a schematic circuit diagram of a transformer provided by an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a voltage transformation method provided by an embodiment of the present application.
  • the vehicle charger is a device for charging the vehicle power battery.
  • the transformer is placed in a metal casing, and the heat of the transformer is quickly transferred through the metal casing.
  • the magnetic core of the transformer will generate a coupling voltage, and the coupling voltage on the magnetic core of the transformer will arc and discharge the metal shell, which will affect the performance of the on-board charger.
  • the embodiment of the present application proposes a transformer.
  • the transformer is placed in a groove made of a metal shell, the metal shell is grounded, the transformer includes a transformer circuit, the transformer circuit includes a transformer core, and the input terminal of the transformer circuit is connected The output end of the power supply and the transformer circuit is connected to a low-voltage battery, the transformer core is connected to a metal conductor, and the metal casing is connected to a metal conductor.
  • the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal casing. It can be seen that in the transformer proposed in the embodiment of the present application, the transformer is placed in a groove made of a metal shell, and the metal shell is grounded.
  • the magnetic core of the transformer and the metal shell are connected by a metal conductor.
  • the magnetic core of the transformer generates the coupling voltage, and the coupling voltage on the magnetic core can be conducted to the metal shell through the metal conductor.
  • the magnetic core and the metal shell are equipotential, thus avoiding the arc discharge between the magnetic core and the metal shell.
  • the arc discharge problem between the magnetic core of the transformer and the metal shell optimizes the performance of the on-board charger.
  • FIG. 1 is a schematic diagram of a transformer 100 provided by an embodiment of the present application.
  • the transformer 100 is placed in a groove made of a metal casing 104.
  • the metal casing 104 is grounded. :
  • the transformer circuit 101 includes a transformer core
  • the input terminal of the transformer circuit 101 is connected to the power supply 102, and the output terminal of the transformer circuit 101 is connected to the low-voltage battery 103;
  • the transformer core is connected to a metal conductor, and the metal shell 104 is connected to a metal conductor.
  • the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal shell 104.
  • the power source 102 may be 220V alternating current, for example.
  • the low-voltage battery 103 may be, for example, a battery with a voltage of 14V.
  • the transformer is placed in a groove made of a metal shell, and the metal shell is grounded.
  • the magnetic core of the transformer and the metal shell are connected by a metal conductor.
  • the magnetic core generates a coupling voltage, and the coupling voltage on the magnetic core can be conducted to the metal casing through the metal conductor.
  • the magnetic core and the metal casing are equipotential, thus avoiding arcing discharge between the magnetic core and the metal casing, and solving the magnetic problem of the transformer.
  • the problem of arc discharge between the core and the metal shell optimizes the performance of the on-board charger.
  • FIG. 2 is a schematic diagram of another transformer 200 provided by an embodiment of the present application.
  • the transformer 200 is placed in a groove made of a metal casing 205, and the metal casing 205 is grounded.
  • the rectifier circuit 202 in which:
  • the transformer circuit 201 includes a transformer core
  • the input terminal of the transformer circuit 201 is connected to the power source 203, and the output terminal of the transformer circuit 201 is connected to the input terminal of the rectifier circuit 202, and the transformer circuit 201 is used to conduct the output current of the power source 203 to the rectifier circuit 202;
  • the output terminal of the rectifier circuit 202 is connected to the low-voltage battery 204, and the rectifier circuit 202 is used to rectify the output current of the transformer circuit 201;
  • the transformer core is connected to a metal conductor, and the metal shell 205 is connected to a metal conductor.
  • the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal shell 205.
  • the power source 203 may be 220V alternating current, for example.
  • the low-voltage battery 204 may be, for example, a battery with a voltage of 14V.
  • the transformer is placed in a groove made of a metal casing, and the metal casing is grounded.
  • the magnetic core of the transformer and the metal casing are connected by a metal conductor.
  • the circuit conducts the output current of the power supply to the rectifier circuit.
  • the rectifier circuit rectifies the output current of the transformer circuit to charge the low-voltage battery.
  • the magnetic core of the transformer generates the coupling voltage, and the coupling voltage on the magnetic core can be conducted to the metal through the metal conductor.
  • the shell, the magnetic core and the metal shell are equipotential, thus avoiding arcing discharge between the magnetic core and the metal shell, solving the problem of arcing discharge between the magnetic core of the transformer and the metal shell, and optimizing the performance of the on-board charger .
  • the transformer circuit 201 includes a primary coil 2011, a transformer core 2012, and a secondary coil 2013.
  • the primary coil 2011 and the secondary coil 2013 are wound on the transformer core 2012;
  • the primary coil 2011 is connected to the power supply 203;
  • the first output terminal of the secondary coil 2013 is connected to the input terminal of the rectifier circuit 202;
  • the transformer core 2012 is grounded through a metal conductor.
  • the rectifier circuit 202 includes a diode D1 and a capacitor C1;
  • the anode of the diode D1 is connected to the first output terminal of the secondary coil 2013;
  • the cathode of the diode D1 is connected to the first end of the capacitor C1 and the low-voltage battery 204.
  • the diode D1 is a rectifier diode.
  • the rectifier circuit 202 is used to rectify the output current of the transformer circuit 201 to charge the low-voltage battery 204.
  • FIG. 5 is a schematic circuit diagram of a transformer 200 according to an embodiment of the present application.
  • the transformer 200 is placed in a groove made of a metal shell 205, the metal shell 205 is grounded, the transformer 200 includes a transformer circuit 201 and a rectifier circuit 202, and the transformer circuit 201 includes a primary coil 2011 and a transformer core. 2012 and the secondary coil 2013, the primary coil 2011 and the secondary coil 2013 are wound on the transformer core 2012, and the rectifier circuit 202 includes a diode D1 and a capacitor C1;
  • the primary coil 2011 is connected to the power supply 203;
  • the anode of the diode D1 is connected to the first output terminal of the secondary coil 2013;
  • the cathode of the diode D1 is connected to the first end of the capacitor C1 and the low-voltage battery 204;
  • the transformer core 2012 is connected to a metal conductor, and the metal shell 205 is connected to a metal conductor.
  • the metal conductor is used to conduct the coupling voltage generated by the transformer core 2012 to the metal shell 205;
  • the transformer circuit 201 is used to conduct the output current of the power supply 203 to the rectifier circuit 202;
  • the rectifier circuit 202 is used to rectify the output current of the transformer circuit 201 to charge the low-voltage battery 204;
  • the transformer core 2012 is grounded through a metal conductor.
  • the transformer is placed in a groove made of a metal casing, and the metal casing is grounded.
  • the magnetic core of the transformer and the metal casing are connected by a metal conductor.
  • the circuit conducts the output current of the power supply to the rectifier circuit.
  • the rectifier circuit rectifies the output current of the transformer circuit to charge the low-voltage battery.
  • the magnetic core of the transformer generates the coupling voltage, and the coupling voltage on the magnetic core can be conducted to the metal through the metal conductor.
  • the shell, the magnetic core and the metal shell are equipotential, thus avoiding arcing discharge between the magnetic core and the metal shell, solving the problem of arcing discharge between the magnetic core of the transformer and the metal shell, and optimizing the performance of the on-board charger .
  • the metal conductor includes a first section, a second section and a third section, the first end of the transformer core is connected to the first section of the metal conductor, and the first side of the metal shell is connected to the second section of the metal conductor , The second side of the metal shell is connected to the third section of the metal conductor, the transformer core is connected to the metal shell through the metal conductor, and the metal shell is grounded.
  • the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal shell.
  • the transformer is placed in a groove made of a metal shell.
  • the metal shell uses a metal material with good conductivity such as copper or aluminum, and the metal shell is grounded.
  • the transformer includes a primary coil, a secondary coil, and a transformer core.
  • the secondary coil is wound on the transformer core.
  • the primary coil and the secondary coil are respectively the input and output coils of the transformer, which transfer energy through magnetic field coupling.
  • the first end of the transformer core is connected to the first section of a metal conductor, such as Metal materials with good conductivity such as copper or aluminum can be used.
  • the first side of the metal shell is connected to the second section of the metal conductor, and the second side of the metal shell is connected to the third section of the metal conductor.
  • the metal conductor is made of copper.
  • the top of the transformer core is in contact with the first section of the copper conductor, one side of the metal shell is in contact with the second section of the copper conductor, and the other side of the metal shell is in contact with the third section of the copper conductor As a result, the transformer core is connected to the metal shell through a copper conductor.
  • the transformer core when a voltage is applied to the coil of the transformer, the transformer core generates a coupling voltage, and the coupling voltage on the transformer core can be conducted to the metal shell through the metal conductor.
  • the transformer core and the metal shell are equipotential, thus avoiding the transformer.
  • the arc discharge between the magnetic core and the metal shell solves the problem of arc discharge between the transformer core and the metal shell, and optimizes the performance of the on-board charger.
  • the metal conductor includes a first metal conductor and a second metal conductor, the first metal conductor includes a first section and a second section, and the second metal conductor includes a first section and a second section.
  • the first end is connected to the first section of the first metal conductor, and the first side of the metal shell is connected to the second section of the first metal conductor;
  • the first end of the transformer core is connected to the first section of the second metal conductor, the second side of the metal shell is connected to the second section of the second metal conductor, and the transformer core is connected to the metal shell through the first metal conductor and the second metal conductor , The metal shell is grounded, and the first metal conductor and the second metal conductor are used to conduct the coupling voltage generated by the transformer core to the metal shell.
  • the transformer is placed in a groove made of a metal shell.
  • the metal shell uses a metal material with good conductivity such as copper or aluminum, and the metal shell is grounded.
  • the transformer includes a primary coil, a secondary coil, and a transformer core.
  • the secondary coil is wound on the transformer core.
  • the primary coil and the secondary coil are respectively the input and output coils of the transformer. They transfer energy through magnetic field coupling.
  • the first end of the transformer core is connected to the first section of the first metal conductor.
  • the first side of the housing is connected to the second section of the first metal conductor, the first end of the transformer core is connected to the first section of the second metal conductor, and the second side of the metal housing is connected to the second section of the second metal conductor.
  • the core is connected to the metal shell through the first metal conductor and the second metal conductor.
  • the first metal conductor and the second metal conductor can use the same metal material.
  • the first metal conductor is a copper conductor
  • the top of the transformer core It is in contact with the first section of the first metal conductor, and one side of the metal shell is in contact with the second section of the first metal conductor.
  • the second metal conductor can also be a copper conductor.
  • the top of the transformer core is connected to the second metal conductor.
  • the first section of the metal shell is in contact and connection, and the other side of the metal shell is in contact with the second section of the second metal conductor.
  • the transformer core is connected to the metal shell through the first metal conductor and the second metal conductor.
  • the transformer core when a voltage is applied to the coil of the transformer, the transformer core generates a coupling voltage.
  • the coupling voltage on the transformer core can be conducted to the metal shell through the first metal conductor and the second metal conductor.
  • the transformer core and the metal shell are equal It avoids the arc discharge between the transformer core and the metal casing, solves the problem of arc discharge between the transformer core and the metal casing, and optimizes the performance of the on-board charger.
  • the embodiment of the present application also provides a voltage transformation device, which includes the above-mentioned transformer, which will not be repeated here.
  • FIG. 6 is a schematic flow diagram of a voltage transformation method provided by an embodiment of the present application, which is applied to a transformer.
  • the transformer is placed in a groove made of a metal shell, the metal shell is grounded, and the transformer A transformer circuit is included, the transformer circuit includes a transformer core, and the method includes:
  • Step 601 Connect the input terminal of the transformer circuit to a power source, and connect the output terminal of the transformer circuit to a low-voltage battery;
  • Step 602 Connect the transformer core to a metal conductor, and connect the metal shell to the metal conductor, and the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal shell.
  • the disclosed device may be implemented in other ways.
  • the device embodiments described above are only illustrative, for example, the division of the above-mentioned units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated. To another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.
  • the units described above as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

L'invention concerne un transformateur, un appareil de transformation et un procédé de transformation. Le transformateur (100) est disposé dans un évidement réalisé dans un boîtier métallique (104) et le boîtier métallique (104) est mis à la terre ; le transformateur (100) comprend un circuit de transformation (101), qui comprend un noyau magnétique de transformateur ; une extrémité d'entrée du circuit de transformation (101) est connectée à une alimentation électrique (102) et une extrémité de sortie du circuit de transformation (101) est connectée à une batterie basse tension (103) ; et le noyau magnétique de transformateur est connecté à un conducteur métallique, le boîtier métallique (104) est connecté au conducteur métallique et le conducteur métallique est utilisé pour conduire une tension de couplage générée par le noyau magnétique de transformateur vers le boîtier métallique (104). La solution technique résout le problème de décharge d'arc entre le noyau magnétique d'un transformateur et un boîtier métallique, ce qui permet d'optimiser les performances d'un chargeur embarqué.
PCT/CN2020/084533 2020-04-13 2020-04-13 Transformateur, appareil de transformation et procédé de transformation WO2021207893A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080004069.5A CN112514013A (zh) 2020-04-13 2020-04-13 变压器、变压装置及变压方法
PCT/CN2020/084533 WO2021207893A1 (fr) 2020-04-13 2020-04-13 Transformateur, appareil de transformation et procédé de transformation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/084533 WO2021207893A1 (fr) 2020-04-13 2020-04-13 Transformateur, appareil de transformation et procédé de transformation

Publications (1)

Publication Number Publication Date
WO2021207893A1 true WO2021207893A1 (fr) 2021-10-21

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078091A1 (fr) * 2000-04-06 2001-10-18 Aria Corporation Bloc d'alimentation tous courants miniature et chargeur de batterie
CN201465761U (zh) * 2009-09-22 2010-05-12 东北电网有限公司哈尔滨超高压局 铁芯外引接地的变压器
CN202142902U (zh) * 2011-06-30 2012-02-08 东莞市盈聚电子有限公司 一种小功率充电器
CN103259425A (zh) * 2013-05-18 2013-08-21 大连碧海电子设备有限公司 大功率高频高压整流变压器
CN103762060A (zh) * 2013-12-31 2014-04-30 湖北华云电气股份有限公司 高压滤波补偿设备中电抗器的油浸自冷减振装置
CN204884829U (zh) * 2015-09-11 2015-12-16 国家电网公司 变压器铁芯多点接地故障放电冲击器
CN107465348A (zh) * 2017-08-30 2017-12-12 深圳市天盾雷电技术有限公司 一种防雷隔离供电装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN211830276U (zh) * 2020-04-13 2020-10-30 深圳欣锐科技股份有限公司 变压器及变压装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078091A1 (fr) * 2000-04-06 2001-10-18 Aria Corporation Bloc d'alimentation tous courants miniature et chargeur de batterie
CN201465761U (zh) * 2009-09-22 2010-05-12 东北电网有限公司哈尔滨超高压局 铁芯外引接地的变压器
CN202142902U (zh) * 2011-06-30 2012-02-08 东莞市盈聚电子有限公司 一种小功率充电器
CN103259425A (zh) * 2013-05-18 2013-08-21 大连碧海电子设备有限公司 大功率高频高压整流变压器
CN103762060A (zh) * 2013-12-31 2014-04-30 湖北华云电气股份有限公司 高压滤波补偿设备中电抗器的油浸自冷减振装置
CN204884829U (zh) * 2015-09-11 2015-12-16 国家电网公司 变压器铁芯多点接地故障放电冲击器
CN107465348A (zh) * 2017-08-30 2017-12-12 深圳市天盾雷电技术有限公司 一种防雷隔离供电装置

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