WO2021207893A1

WO2021207893A1 - Transformer, transformation apparatus and transformation method

Info

Publication number: WO2021207893A1
Application number: PCT/CN2020/084533
Authority: WO
Inventors: 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: 2020-04-13
Filing date: 2020-04-13
Publication date: 2021-10-21
Also published as: CN112514013A

Abstract

A transformer, a transformation apparatus and a transformation method. The transformer (100) is placed in a recess made of a metal housing (104), and the metal housing (104) is grounded; the transformer (100) comprises a transformation circuit (101), which comprises a transformer magnetic core; an input end of the transformation circuit (101) is connected to a power supply (102), and an output end of the transformation circuit (101) is connected to a low-voltage battery (103); and the transformer magnetic core is connected to a metal conductor, the metal housing (104) is connected to the metal conductor, and the metal conductor is used for conducting coupling voltage generated by the transformer magnetic core to the metal housing (104). The technical solution solves the problem of arc discharge between the magnetic core of a transformer and a metal housing, thus optimizing the performance of an on-board charger.

Description

Transformer, transformation device and transformation method

Technical field

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.

Background technique

With the popularization of electric vehicles, more and more people choose electric vehicles when traveling. On-board chargers are devices that charge on-board power batteries. In power transmission, transformers are often required to isolate and transmit energy.

In the prior art, 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. However, there is often a gap between the magnetic core of the transformer and the metal casing, and voltage is applied to the coil of the transformer. When it is connected, 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.

Application content

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, and the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal shell.

In a possible example, 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.

In a possible example, 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.

In a possible example, 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.

In a possible example, the transformer core is grounded through the metal conductor.

In a possible example, 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.

In a possible example, 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;

Connect the input end of the transformer circuit to a power source, and connect the output end of the transformer circuit to a low-voltage battery;

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.

In this application, 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. It can be seen that, through the transformer provided by this 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 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.

These and other aspects of the application will be more concise and understandable in the description of the following embodiments.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the application or the background art, the following will briefly introduce the drawings involved in the embodiments of the application or the background art.

The drawings involved in the embodiments of the present application will be briefly introduced below.

Fig. 1 is a schematic diagram of a transformer provided by an embodiment of the present application;

Figure 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.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the application, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only These are a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

Detailed descriptions are given below.

The terms "first", "second", "third" and "fourth" in the specification and claims of this application and the drawings are used to distinguish different objects, not to describe a specific order . In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment.

The reference to "embodiments" herein means that a specific feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art clearly and implicitly understand that the embodiments described herein can be combined with other embodiments.

The vehicle charger is a device for charging the vehicle power battery. When power is transmitted, it is often necessary to isolate and transmit energy through a transformer. In the prior art, 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. However, there is often a gap between the magnetic core of the transformer and the metal casing, and voltage is applied to the coil of the transformer. When it is connected, 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.

In view of the above-mentioned problems, 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.

The embodiments of the present application will be described below in conjunction with the drawings.

Please refer to FIG. 1. 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.

Wherein, the power source 102 may be 220V alternating current, for example.

Among them, the low-voltage battery 103 may be, for example, a battery with a voltage of 14V.

It can be seen that in the above technical solution, 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.

Please refer to FIG. 2, which 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.

Wherein, the power source 203 may be 220V alternating current, for example.

Among them, the low-voltage battery 204 may be, for example, a battery with a voltage of 14V.

It can be seen that in the above technical solution, 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 .

In a possible example, referring to FIG. 3, 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.

In a possible example, please refer to FIG. 4, 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. Among them, 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.

Please also refer to FIG. 5, which is a schematic circuit diagram of a transformer 200 according to an embodiment of the present application;

As shown in Figure 5, 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 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.

In a possible example, 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.

Specifically, 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. For example, the metal conductor is made of copper. Body, 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.

In this way, 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.

In a possible example, 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.

Specifically, 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. For example, the first metal conductor is a copper conductor, and 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. Thus, the transformer core is connected to the metal shell through the first metal conductor and the second metal conductor.

In this way, 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.

Please refer to FIG. 6, which 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.

It should be noted that for the foregoing application embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that this application is not limited by the described sequence of actions. Because according to this application, some steps can be performed in other order or at the same time. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in an embodiment, reference may be made to related descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed device may be implemented in other ways. For example, 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. In addition, 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.

In addition, 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.

The embodiments of the application are described in detail above, and specific examples are used in this article to illustrate the principles and implementation of the application. The descriptions of the above embodiments are only used to help understand the application and its core ideas; at the same time, for the field According to the idea of this application, the general technical personnel of, will have changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

A transformer, characterized in that 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, and the metal conductor is used to conduct the coupling voltage generated by the transformer core to the metal shell.
The transformer according to claim 1, wherein the transformer further comprises 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 according to claim 2, wherein the transformer circuit further comprises 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 transformer according to claim 3, wherein the rectifier circuit comprises 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 according to any one of claims 1 to 4, wherein the transformer core is grounded through the metal conductor.
The transformer of claim 5, wherein 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 transformer according to claim 1, wherein 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 The first and second paragraphs;

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 voltage transformation device, characterized by comprising the transformer according to any one of claims 1 to 7.
A voltage transformation method, characterized in that it is applied to the transformer according to any one of claims 1 to 7 or the transformation device according to claim 8, wherein the transformer is placed in a groove made of a metal shell, and The metal casing is grounded, the transformer includes a transformer circuit, and the transformer circuit includes a transformer core;

Connect the input end of the transformation circuit to a power source, and connect the output end of the transformation circuit to a low-voltage battery;

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.