CN216699623U - Wireless charging system circuit - Google Patents
Wireless charging system circuit Download PDFInfo
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- CN216699623U CN216699623U CN202122915747.8U CN202122915747U CN216699623U CN 216699623 U CN216699623 U CN 216699623U CN 202122915747 U CN202122915747 U CN 202122915747U CN 216699623 U CN216699623 U CN 216699623U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
Abstract
The utility model discloses a wireless charging system circuit, which comprises: an alternating current power supply for supplying electric energy to the wireless charging system; the energy supply unit is connected with the output end of the alternating current power supply and is used for converting alternating current output by the alternating current power supply into direct current to realize power factor correction and inverting the direct current after the power factor correction into high-frequency alternating current; the transmitting end is connected with the output end of the energy supply unit and is used for converting the high-frequency alternating current into an alternating magnetic field; the receiving end is used for receiving the alternating magnetic field output by the transmitting end and converting the alternating magnetic field into direct current; the battery is connected with the output end of the receiving end and used for receiving and charging the direct current output by the receiving end; and an electrical isolation unit for electrically isolating the transmitting end from the grid side. According to the utility model, through the arrangement of the electrical isolation unit, the transmitting end and the connecting cable of the transmitting end and the energy supply unit are changed into the secondary side, so that the risk of electric shock when the cable is subjected to insulation failure is avoided.
Description
Technical Field
The utility model relates to the technical field of wireless charging of electric automobiles, in particular to a wireless charging system circuit.
Background
With the rapid development of our country in the field of electric vehicles in recent years, how to realize the safe, convenient and rapid charging of electric vehicles is of great significance. The traditional scheme of electric automobile charging is to directly obtain electric energy from the power grid through charging piles. However, when the electric vehicle is charged in a wired manner, the charging socket or the cable usually has a part exposed outside, so that electric sparks and electric arcs are easily generated during high-power charging, and great potential safety hazards exist; meanwhile, the traditional wired charging requires manual operation of a user, and the phenomenon of poor contact is easily caused by artificial negligence and hardware abrasion caused by frequent plugging and unplugging of a charging socket, so that personal safety events in a high-power environment are caused.
In order to solve the above problems, a short-distance wireless power transmission technology is generally adopted to realize wireless charging of the electric vehicle. The wireless charging technology of the electric automobile is divided into three parts, namely an energy supply unit, a transmitting end and a receiving end. The energy supply unit is installed in a floor type or wall-mounted type, the input of the energy supply unit is alternating current commercial power, the main function is to rectify the alternating current into direct current and generate high-frequency current through inversion; the transmitting end is installed on the ground or underground and is connected with the pile end through a cable, and the high-frequency current generated by the pile end is converted into magnetic field energy and transmitted; the receiving end is installed at the bottom of the automobile, receives magnetic field energy, and charges the battery of the electric automobile after rectifying the induced current.
However, the transmitting terminal is installed on the ground or underground and is connected with the primary side of the power grid, when faults such as aging and damage of cables or water inflow of the transmitting terminal occur, the possibility of electric shock is caused by personal contact, and personal safety is greatly influenced.
Therefore, how to design a wireless charging system circuit, which can ensure the personal safety when the circuit has an insulation fault, is a technical problem to be solved urgently in the industry.
SUMMERY OF THE UTILITY MODEL
The utility model provides a wireless charging system circuit, aiming at the problem that electric shock is easily caused when a cable is aged and damaged or a transmitting end is filled with water in the prior art.
The technical scheme of the utility model is that a wireless charging system circuit is provided, which comprises:
an alternating current power supply for supplying electric energy to the wireless charging system;
the energy supply unit is connected with the output end of the alternating current power supply and is used for converting alternating current output by the alternating current power supply into direct current to realize power factor correction and inverting the direct current after the power factor correction into high-frequency alternating current;
the transmitting end is connected with the output end of the energy supply unit and is used for converting the high-frequency alternating current into an alternating magnetic field;
the receiving end is used for receiving the alternating magnetic field output by the transmitting end and converting the alternating magnetic field into direct current;
the battery is connected with the output end of the receiving end and used for receiving and charging the direct current output by the receiving end;
an electrical isolation unit for electrically isolating the transmitting end from a grid side.
Further, the energy supply unit comprises an AC/DC rectification unit and a DC/AC high-frequency inversion unit which are sequentially connected with the output end of the alternating current power supply;
the transmitting end comprises a transmitting end compensation network unit and a transmitting coil which are sequentially connected with the output end of the energy supply unit;
the receiving end comprises a receiving coil for receiving the alternating magnetic field output by the transmitting coil, and a receiving end compensation network unit and an AC/DC high-frequency rectifying unit which are sequentially connected with the output end of the receiving coil.
Further, the electrical isolation unit is connected between the DC/AC high-frequency inversion unit and the transmitting terminal compensation network unit.
Further, the electrical isolation unit adopts a transformer to realize electrical isolation.
Furthermore, the electrical isolation unit further comprises a blocking capacitor connected to the primary side of the transformer, and the blocking capacitor is used for preventing the magnetic bias problem of the transformer during working.
Furthermore, the transformer comprises a magnetic core and a winding wound on the magnetic core, and an air gap is additionally arranged on the magnetic core.
Further, the transmitting terminal compensation network unit and the electrical isolation unit are integrated into a first integrated unit, and the first integrated unit comprises a blocking capacitor, a transformer, a compensation inductor and a compensation capacitor.
Further, the compensation inductor is connected between the blocking capacitor and the primary side of the transformer, and the compensation capacitor is connected to the secondary side of the transformer.
Furthermore, the winding mode of the transformer is set according to the leakage inductance value of the transformer.
Further, the transmitting terminal compensation network unit and the electrical isolation unit are integrated into a second integrated unit, and the second integrated unit comprises a compensation capacitor, a compensation inductor and a transformer.
Further, the compensation capacitor is connected between the output end of the DC/AC high-frequency inversion unit and the compensation inductor, the other side of the compensation inductor is connected to the primary side of the transformer, and the secondary side of the transformer is connected with the transmitting coil.
Further, the compensation inductor is connected between the output end of the DC/AC high-frequency inverter unit and the primary side of the transformer, and the compensation capacitor is connected between the secondary side of the transformer and the transmitting coil.
Compared with the prior art, the utility model has at least the following beneficial effects:
1. the electrical isolation unit is added at the output end of the energy supply unit, so that the transmitting end and a connecting cable of the transmitting end and the energy supply unit become secondary sides, the electrical isolation is realized with a power grid, and when the two parts are subjected to insulation failure or airtight failure and water enters, the situation of electric shock cannot occur when a human body is contacted.
2. The electric isolation unit reduces common mode current and reduces EMC risk through the design of the transformer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor;
fig. 1 is a schematic connection diagram of a wireless charging system circuit according to an embodiment of the utility model;
FIG. 2 is a schematic connection diagram of an electrical isolation unit according to another embodiment of the present invention;
fig. 3 is a schematic connection diagram of a wireless charging system circuit according to another embodiment of the utility model;
fig. 4 is a schematic connection diagram of a wireless charging system circuit according to another embodiment of the utility model;
fig. 5 is an integrated schematic diagram of the transmitting-side compensation network unit and the electrical isolation unit in the embodiment of fig. 4;
fig. 6 is an integrated schematic diagram of a transmitting-end compensation network unit and an electrical isolation unit according to another embodiment of the present invention;
fig. 7 is an integrated schematic diagram of a transmitting-end compensation network unit and an electrical isolation unit according to another embodiment of the present invention;
fig. 8 is an integrated schematic diagram of a transmitting-end compensation network unit and an electrical isolation unit according to another embodiment of the present invention;
fig. 9 is a schematic connection diagram of a wireless charging system circuit according to another embodiment of the utility model;
FIG. 10 is an equivalent circuit diagram of a transmitting coil of the transmitting end in the presence of stray capacitance to PE;
fig. 11 is a schematic diagram of the circuit connection after transformer isolation is added in the embodiment of fig. 10.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the utility model, and does not imply that every embodiment of the utility model must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
The wireless charging technology of the electric automobile is divided into three parts, namely an energy supply unit, a transmitting end and a receiving end. The energy supply unit is installed in a floor type or wall-mounted type, the input of the energy supply unit is alternating current commercial power, the main function is to rectify the alternating current into direct current and generate high-frequency current through inversion; the transmitting end is installed on the ground or underground and is connected with the pile end through a cable, and the high-frequency current generated by the pile end is converted into magnetic field energy and transmitted; the receiving end is installed at the bottom of the automobile, receives magnetic field energy, and charges the battery of the electric automobile after rectifying the induced current. However, the transmitting terminal is installed on the ground or underground and is connected with the primary side of the power grid, when faults such as aging and damage of cables or water inflow of the transmitting terminal occur, the possibility of electric shock is caused by personal contact, and personal safety is greatly influenced. In view of the above problems, the present invention is directed to a wireless charging system circuit, in which a transmitting terminal and a cable connecting the transmitting terminal and an energy supply unit are changed from a primary side to a secondary side, so as to ensure that there is no risk of electric shock when the two components are in insulation failure.
Specifically, the wireless charging system circuit provided by the present invention includes: the device comprises an alternating current power supply, an energy supply unit, a transmitting end, a receiving end, a battery and an electrical isolation unit;
the composition and main functions of each part are as follows:
an alternating current power supply which adopts an AC single-phase/three-phase alternating current source and is used for providing electric energy for the wireless charging system;
the energy supply unit consists of an AC/DC rectification unit and a DC/AC high-frequency inversion unit, is connected to the output end of the alternating current power supply and is used for receiving single-phase/three-phase alternating current, rectifying the alternating current into direct current through the AC/DC rectification unit to realize a Power Factor Correction (PFC) function, and inverting the direct current into high-frequency alternating current through the DC/AC high-frequency inversion unit;
and the transmitting end is connected to the output end of the energy supply unit through a cable and consists of a transmitting end compensation network unit and a transmitting coil. The high-frequency alternating current generator is used for receiving high-frequency alternating current output by the energy supply unit and converting the alternating current into an alternating magnetic field through the transmitting terminal compensation network unit and the transmitting coil;
the receiving end consists of a receiving coil, a receiving end compensation network unit and an AC/DC high-frequency rectifying unit, the input of the receiving end is an alternating magnetic field output by the transmitting end, the alternating magnetic field is converted into an alternating current power supply through the receiving coil and the receiving end compensation network unit, and the alternating current power supply is rectified into direct current through the AC/DC high-frequency rectifying unit to charge the battery of the electric automobile;
the battery, namely the battery of the electric automobile, is used for receiving the direct current that the receiving end outputs and charging, equivalent to the load of constant voltage type in the utility model;
and the electrical isolation unit is arranged at the output end of the energy supply unit and used for realizing electrical isolation between the transmitting end and the power grid side and avoiding electric shock risks.
Referring to fig. 1, in an embodiment of the present invention, a wireless charging system circuit includes an AC single-phase/three-phase AC source, an energy supply unit, a transmitting terminal, a receiving terminal, and a battery, wherein an electrical isolation unit is disposed in the energy supply unit and is disposed at an output terminal thereof, so as to change a connection cable between the transmitting terminal and the energy supply unit from a primary side to a secondary side, thereby avoiding an electric shock risk.
Referring to fig. 2, in another embodiment of the present invention, the electrical isolation unit employs a transformer, and the transformer can be used for electrical isolation to avoid the occurrence of electric shock. In addition, the transformer can also reduce EMC risk, please refer to fig. 10 and 11, the transmitting coil in the transmitting end has stray capacitance to the PE, because of the existence of AC/DC and DC/AC high frequency switching noise, common mode current will flow through the stray capacitance between the coil and the PE, after the transformer is added, the transformer can be equivalent to the series connection of the capacitance of the primary and secondary sides of the transformer and the capacitance of the transmitting coil to the PE, thereby reducing the common mode current and reducing the EMC risk.
Referring to fig. 2, in this embodiment, the electrical isolation unit further includes a dc blocking capacitor connected to the primary side of the transformer, which can prevent the transformer in the electrical isolation unit from generating magnetic bias during operation.
Further, under the embodiment of fig. 2, the transformer includes a magnetic core and a winding wound around the magnetic core, wherein an air gap is added to the magnetic core during manufacturing, which can ensure that the transformer is not saturated when the transformer is subjected to magnetic bias.
Referring to fig. 3, in another embodiment of the present invention, the wireless charging system circuit includes an AC single-phase/three-phase AC source, an energy supply unit, a transmitting terminal, a receiving terminal and a battery, wherein the electrical isolation unit and the transmitting terminal compensation network unit in the transmitting terminal are disposed in the energy supply unit, so as to reduce devices in the transmitting terminal, and simultaneously, the design manner can reduce current harmonics of the cable connecting the energy supply unit and the transmitting terminal.
In order to reduce the number of components of the energy supply unit on the basis of the embodiment of fig. 3, see fig. 4, in a further embodiment of the utility model, the transmitting-side compensation network unit is integrated with the electrical isolation unit, herein referred to as the first integrated unit. In this embodiment, the energy supply unit is composed of the AC/DC rectifying unit, the DC/AC high-frequency inverting unit, and the first integrated unit, and the number of the devices is reduced compared to the embodiment of fig. 3. Referring to fig. 5, in this embodiment, the first integrated unit is composed of a dc blocking capacitor, a transformer, a compensation inductor and a compensation capacitor.
Referring to fig. 6, in another embodiment of the present invention, in order to reduce the size of the transformer, the compensation inductor is disposed between the primary side of the transformer and the DC blocking capacitor, in which case, the DC blocking capacitor is connected to the output terminal of the DC/AC high frequency inverter unit, the compensation inductor is connected between the output terminal of the DC blocking capacitor and the primary side of the transformer, and the compensation capacitor is connected to the secondary side of the transformer. When the transformer works, high-frequency current flows through the transformer, the compensation inductor can reduce the working voltage of the transformer, and the size of the transformer can be reduced under the condition of the same current.
Referring to fig. 7, in another embodiment of the present invention, in order to replace the compensation inductance to reduce the number of devices, the winding manner of the transformer is set according to the leakage inductance of the transformer, so that the inductance is increased, and the compensation inductance is replaced to reduce the number of devices.
Referring to fig. 8, in another embodiment of the present invention, in order to replace the DC blocking capacitor to reduce the number of devices, the position of the compensation capacitor may be changed, referring to the right diagram of fig. 8, the compensation capacitor is disposed between the output end of the DC/AC high frequency inverter unit and the compensation inductor, and the compensation capacitor also has the DC blocking function, so that the arrangement of the DC blocking capacitor may be eliminated.
Referring to the left diagram of fig. 8, the number of devices may be further reduced on the basis of the embodiment of fig. 7, the amount of leakage inductance is set by changing the winding mode of the transformer, the leakage inductance of the transformer is used to replace the compensation inductance, and then the position of the compensation capacitor is changed to replace the dc blocking capacitor, at this time, the composition of the transmission terminal compensation network unit and the electrical isolation unit after integration includes the compensation capacitor and the transformer (in the figure, the leakage inductance of the transformer is obtained according to the setting of the winding mode of the transformer, and no device is needed), and compared with the embodiments of fig. 7 and fig. 8, the number of the devices is smaller as a whole, and the cost and the volume of the device may be further reduced.
Referring to fig. 9, in another embodiment of the present invention, the transmitting terminal compensation network unit includes an AC single-phase/three-phase AC source, an energy supply unit, a transmitting terminal, a receiving terminal and a battery, wherein the energy supply unit includes an AC/DC rectifying unit, a DC/AC high-frequency inverting unit and an integrated structure of the transmitting terminal compensation network unit and the electrical isolation unit, and the transmitting terminal includes a compensation capacitor and a transmitting coil, in which case, compared with the connection method of the embodiment of fig. 6, the integrated structure of the transmitting terminal compensation network unit and the electrical isolation unit removes the arrangement of the compensation capacitor, and the compensation capacitor is arranged in the transmitting terminal, which is connected between the integrated structure of the transmitting terminal compensation network unit and the electrical isolation unit and the transmitting coil, and in normal operation, because the loss of the compensation capacitor is small, by adopting the design method, the reactive current of the compensation capacitor can be prevented from flowing through the cable connecting the energy supply unit and the transmitting terminal, so as to achieve the purpose of reducing the loss of the cable.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (12)
1. A wireless charging system circuit, comprising:
an alternating current power supply for supplying electric energy to the wireless charging system;
the energy supply unit is connected with the output end of the alternating current power supply and is used for converting alternating current output by the alternating current power supply into direct current to realize power factor correction and inverting the direct current after the power factor correction into high-frequency alternating current;
the transmitting end is connected with the output end of the energy supply unit and is used for converting the high-frequency alternating current into an alternating magnetic field;
the receiving end is used for receiving the alternating magnetic field output by the transmitting end and converting the alternating magnetic field into direct current;
the battery is connected with the output end of the receiving end and used for receiving and charging the direct current output by the receiving end;
an electrical isolation unit for electrically isolating the transmitting end from a grid side.
2. The wireless charging system circuit of claim 1, wherein the energy supply unit comprises an AC/DC rectifying unit and a DC/AC high frequency inverting unit connected to the AC power output terminal in this order;
the transmitting end comprises a transmitting end compensation network unit and a transmitting coil which are sequentially connected with the output end of the energy supply unit;
the receiving end comprises a receiving coil for receiving the alternating magnetic field output by the transmitting coil, and a receiving end compensation network unit and an AC/DC high-frequency rectifying unit which are sequentially connected with the output end of the receiving coil.
3. The wireless charging system circuit of claim 2, wherein the galvanic isolation unit is connected between the DC/AC high frequency inverter unit and the transmit side compensation network unit.
4. The wireless charging system circuit of claim 3, wherein the electrical isolation unit is electrically isolated using a transformer.
5. The wireless charging system circuit of claim 4, wherein the electrical isolation unit further comprises a blocking capacitor connected to the primary side of the transformer, and the blocking capacitor is used for preventing magnetic bias problem when the transformer operates.
6. The wireless charging system circuit of claim 4, wherein the transformer comprises a magnetic core and a winding wound around the magnetic core, and an air gap is added to the magnetic core.
7. The wireless charging system circuit of claim 2, wherein the transmit side compensation network unit and the electrical isolation unit are integrated into a first integrated unit, the first integrated unit comprising a dc blocking capacitor, a transformer, a compensation inductance, and a compensation capacitance.
8. The wireless charging system circuit of claim 7, wherein the compensation inductor is connected between the dc blocking capacitor and a primary side of the transformer, and the compensation capacitor is connected to a secondary side of the transformer.
9. The wireless charging system circuit of claim 7, wherein the winding of the transformer is set according to a leakage inductance of the transformer.
10. The wireless charging system circuit of claim 2, wherein the transmit side compensation network unit and the electrical isolation unit are integrated into a second integrated unit comprising a compensation capacitor, a compensation inductor, and a transformer.
11. The wireless charging system circuit of claim 10, wherein the compensation capacitor is connected between the output terminal of the DC/AC high frequency inverter unit and the compensation inductor, the other side of the compensation inductor is connected to the primary side of the transformer, and the secondary side of the transformer is connected to the transmitting coil.
12. The wireless charging system circuit of claim 7, wherein the compensation inductor is connected between the output terminal of the DC/AC high frequency inverter unit and the primary side of the transformer, and the compensation capacitor is connected between the secondary side of the transformer and the transmitting coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122915747.8U CN216699623U (en) | 2021-11-25 | 2021-11-25 | Wireless charging system circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122915747.8U CN216699623U (en) | 2021-11-25 | 2021-11-25 | Wireless charging system circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216699623U true CN216699623U (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122915747.8U Active CN216699623U (en) | 2021-11-25 | 2021-11-25 | Wireless charging system circuit |
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| CN (1) | CN216699623U (en) |
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2021
- 2021-11-25 CN CN202122915747.8U patent/CN216699623U/en active Active
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