CN213705192U - Wireless charging device for household electric automobile - Google Patents

Wireless charging device for household electric automobile Download PDF

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Publication number
CN213705192U
CN213705192U CN202022414538.0U CN202022414538U CN213705192U CN 213705192 U CN213705192 U CN 213705192U CN 202022414538 U CN202022414538 U CN 202022414538U CN 213705192 U CN213705192 U CN 213705192U
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CN
China
Prior art keywords
charging device
wireless
bridge arm
wireless charging
unit
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Expired - Fee Related
Application number
CN202022414538.0U
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Chinese (zh)
Inventor
郝鹏飞
张盼盼
罗熠文
解宇鑫
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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Priority to CN202022414538.0U priority Critical patent/CN213705192U/en
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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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • 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
    • Y02T90/14—Plug-in electric vehicles

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Abstract

The utility model discloses a wireless charging device for a household electric vehicle, which comprises a power factor correction unit, a wireless transmitting unit and a wireless receiving unit, wherein the power factor correction unit is connected with an alternating current power supply and is used for carrying out voltage and current closed-loop control on the alternating current power supply so as to realize the correction of a power factor; the wireless transmitting unit receives the current and voltage processed by the power factor correction unit and performs resonance control to realize the output of constant current power supply, and the wireless receiving unit outputs power supply for the load and the energy storage capacitor through resonance and rectification. The utility model reduces the generation of reactive power by arranging the power factor correction unit; and the wireless transmitting unit and the wireless receiving unit realize power supply and ensure the connection of the whole charging device and a load.

Description

Wireless charging device for household electric automobile
Technical Field
The utility model belongs to the technical field of domestic wireless transmission, a but wireless power transmission device of direct access electric wire netting is related to.
Background
Traditional wired power transmission often can not satisfy needs under some special conditions, and too many electric wires and sockets also bring various inconveniences to life, so the realization of wireless power transmission mode comes up to now. In the automobile industry, the charging problem of the electric automobile makes the oil-driven automobile more outstanding, the realization and the application of the household type automobile charging device need more sufficient development, and the household type wireless automobile charging device has a larger application prospect. The existing wireless automobile charging device needs to be matched with an external rectifier module, the cost of the system can be obviously improved, the power factor of alternating current is small, the harmonic component is large, and then large reactive power can be generated, and the pollution to a power grid is large. The existing wireless charging system is almost high in power, a high-frequency inversion part needs to be subjected to frequency closed loop, and the wireless charging system is large in size and high in cost.
Disclosure of Invention
In order to avoid the weak point of prior art, the utility model provides a but the wireless charging device of electric automobile of direct access electric wire netting with power factor correction to solve the problem of the wireless charging device external rectifier module of electric automobile.
In order to realize the above effect, the utility model discloses a following technical scheme realizes:
a wireless charging device for a household electric vehicle comprises a power factor correction unit, a wireless transmitting unit and a wireless receiving unit;
the power factor correction unit is connected with an alternating current power supply and is used for carrying out voltage and current closed-loop control on the alternating current power supply so as to realize power factor correction; the wireless transmitting unit receives the current and voltage processed by the power factor correction unit and performs resonance control to realize the output of constant current power supply, and the wireless receiving unit outputs power supply for the load and the energy storage capacitor through resonance and rectification.
As a further improvement of the present invention, the power factor correction unit is a three-level bridge circuit. Adopt three level bridge circuit, for two level bridge circuit, have the advantage that switch tube voltage stress is low, and then when using, this device has 2 times forward and blocks voltage ability to can reduce the harmonic and reduce switching frequency, thereby make the system loss reduce.
As a further improvement of the present invention, the three-level bridge circuit includes three sets of bridge arms, each set of bridge arms are respectively provided with an upper bridge arm and a lower bridge arm, and is the same set of the upper bridge arm and the lower bridge arm in the bridge arms are simultaneously turned on or turned off.
In the technical scheme, the pipes of the same bridge arm are simultaneously switched on and off, so that the problem of simultaneous switching on and off of the upper pipe and the lower pipe can be avoided, the problem of dead zones of switching on the upper pipe and the lower pipe does not need to be considered during control, and the control method is simple.
As a further improvement of the present invention, the upper bridge arm and the lower bridge arm are diodes. In the technical scheme, the upper bridge arm and the lower bridge arm are replaced by the diodes, the technology is mature, and the use is safer.
As the utility model discloses a further improve every group the bridge arm all is equipped with the double switch, the both ends of double switch are connected with every bridge arm mid point and direct current side mid point respectively. By being set at the midpoint, the objective is to provide a basis for subsequent simultaneous control. Meanwhile, because the MOS tube has a reverse diode, the reverse direction can not be cut off, so that a double switch is arranged for controlling the forward direction and the reverse direction.
As a further improvement, the wireless transmitting unit includes self-excited inverter circuit and parallel resonance circuit, self-excited inverter circuit passes through control switch, realizes the energy storage of different chokes to and parallel resonance circuit's energy storage or resonance.
As the utility model discloses a further improvement, self-excited inverter circuit is bridge type constitutional unit, bridge type constitutional unit is including parallelly connected last bridge arm and lower bridge arm, it is energy storage inductance to go up the bridge arm for the constant current, the bridge arm is the switch tube down for control self-excited inverter circuit.
As a further improvement of the invention, the bridge structure unit comprises series-connected chokes L a And a choke coil L b And a parallel switch tube Q a And a switching tube Q b 。
As a further improvement of the present invention, the parallel resonant unit includes an inductor L4 and a capacitor C3 connected in parallel.
As a further improvement of the utility model, wireless receiving unit includes resonance receiving unit and the rectifier unit of establishing ties, resonance receiving unit is the series resonance, including receiving coil and receiving capacitance, rectifier circuit includes four rectifier diodes VD7-VD10And a filter capacitor C4。
The utility model has the advantages as follows:
the utility model reduces the generation of reactive power by arranging the power factor correction unit; and the wireless transmitting unit and the wireless receiving unit realize power supply and ensure the connection of the whole charging device and a load.
The rectifier filter circuit in the utility model adopts a VIENNA rectifier circuit with PFC, which can realize the unit power factor input of an AC circuit; the inverter circuit adopts the design of a self-excited inverter circuit, has a simple structure, can realize the self-driving and zero-voltage switching-on and switching-off of a switching tube, has small loss, and does not need to consider the dead zone problem of the conduction of an upper tube and a lower tube in the whole circuit design.
The utility model discloses use VIENNA rectifier and self-excited inverter cooperation to use, thereby the DC voltage through controlling the VIENNA rectifier controls the wireless output that charges, the self-excited inverter need not control alright turn into the sinusoidal alternating current the same with resonant network resonant frequency with the direct current.
Drawings
Fig. 1 is a schematic circuit diagram of a wireless charging device for a household electric vehicle according to the present invention;
fig. 2 is a circuit diagram of a power factor correction unit provided by the present invention;
fig. 3 is a circuit diagram of the connection between the wireless transmitting unit and the wireless receiving unit provided by the present invention;
fig. 4 is a circuit diagram of a wireless charging device for a household electric vehicle.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a wireless charging device for a household electric vehicle, which comprises a power factor correction unit, a wireless transmitting unit and a wireless receiving unit.
The power factor correction unit adopts a VIENNA rectifying circuit and comprises six switching tubes Q1-Q6Six diodes VD1-VD6Filter capacitor C1And C2And three filter inductors L1-L3Six of them are Q1-Q6And six diodes VD1-VD6Three groups of switching tubes Q forming a three-level bridge circuit1And Q2、Q3And Q4、Q5And Q6Respectively switched on and off simultaneously. The switching on and off of the switching tube of the traditional PWM rectifier circuit are not finished instantly, in order to prevent the short circuit problem caused by the simultaneous switching on of the upper tube and the lower tube, a certain dead time needs to be considered in circuit control, the switching on of the next period can be carried out only after the upper tube and the lower tube are simultaneously switched off, the upper bridge arm and the lower bridge arm of the VIENNA rectifier circuit are replaced by diodes, double switching tubes are reversely connected in series at the midpoint of the bridge arm and the midpoint of the direct current side, and the tubes of the same bridge arm are simultaneously switched on and off, so that the problem of simultaneous switching on and off of the upper tube and the lower tube does not occur, the dead time problem of the conduction of the upper. In order to control the DC output voltage to control the wireless transmission power and realize the function of PFC, a VIENNA rectifier is adoptedThe voltage and current double closed-loop control is carried out, the output power can be controlled by the closed-loop control of the direct current voltage, and the function of power factor correction can be realized by the closed-loop control of the alternating current.
In this embodiment, the VIENNA rectifier circuit. Six diodes form a three-phase uncontrollable rectifier bridge, three inductors are respectively connected in series to the rectifier bridge for alternating current input, two direct current capacitors are connected in series between a direct current output positive bus and a direct current output negative bus of the rectifier bridge, six switching tubes are connected in series in pairs to form three independent bidirectional controllable switches, one end of each three independent bidirectional controllable switch is connected to the middle point of the series capacitor between the direct current side positive bus and the direct current side negative bus, and the other end of each three independent bidirectional controllable switch is connected to the intersection point of the three filter inductors and the three-phase uncontrollable rectifier bridge.
The wireless transmitting unit mainly comprises a self-excited inverter circuit and a parallel resonance part, the upper end of an inductor La is connected with a positive bus of a direct-current power supply, the lower end of the inductor La is connected with a drain electrode of a switch tube Qa, a source electrode of the switch tube Qa is connected with a negative bus of the direct-current power supply, and the inductor La and the switch tube Qa form a set of bridge arms. The upper end of the inductor Lb is connected with a positive bus of the direct-current power supply, the lower end of the inductor Lb is connected with a drain electrode of the switch tube Qb, a source electrode of the switch tube Qb is connected with a negative bus of the direct-current power supply, and the inductor Lb and the switch tube Qb form another group of bridge arms. The inductor L4 and the capacitor C3 are connected in parallel to form an LC parallel resonance circuit and are connected between the point a at the lower end of the inductor La and the point b at the lower end of the inductor Lb in series. The resistors R1 and R2 are respectively incorporated between the gate and source of the switching tube Qa and the switching tube Qb, and serve as a discharge circuit of the parasitic capacitance when the switching tube is turned off. The cathode of the diode VDa is connected to the point a at the lower end of the inductor La, and the anode of the diode VDa is connected to the gate of the switching tube Qb. The cathode of the diode VDb is connected to the point b at the lower end of the inductor Lb, and the anode of the diode VDb is connected to the gate of the switching tube Qa. One end of the resistor Ra is connected with the positive bus of the direct-current power supply, and the other end of the resistor Ra is connected with the grid of the switching tube Qa. One end of the resistor Rb is connected with the positive bus of the direct-current power supply, and the other end is connected with the grid of the switching tube Qb. The diodes VDa, VDb and the resistors Ra, Rb constitute a driving circuit for the switching tube Qa and the switching tube Qb. The self-excited inverter circuit mainly comprises two switching tubes Q a And Q b And two chokes L a And L b The bridge type bridge circuit comprises an upper bridge arm, a lower bridge arm and a plurality of switching tubes, wherein the upper bridge arm and the lower bridge arm jointly form a bridge type structure, the upper bridge arm is an energy storage inductor and keeps current constant, the lower bridge arm is a switching tube, and driving signals of the two switching tubes are 180 degrees different from each other. The parallel resonance section mainly includes an inductance L4 and a capacitance C3.
The local structure in the whole circuit is symmetrical due to the current-limiting resistor R a And R b And a diode VD a And VD b So that two switching tubes Q are present a And Q b It is not possible to switch on simultaneously. Let us assume choke L a And L b Sufficiently large that the current flowing can be assumed to be non-fluctuating, provided that Q is a Diode VD when it is turned on a In the on state, Q b The gate voltage of (1) is directly low, then Q b In the off state, Udc stores energy to the choke La through the switch tube Qa, the choke Lb supplies constant current to the parallel resonant circuit networks L4 and C3, the inductor L4 resonates with the capacitor C3, the voltage Uab across the resonant network is a sine wave with a frequency equal to the natural frequency of the resonant network, and Uab is the natural frequency of the resonant network<0, when Uab>At 0, the diode VDb is turned on, the gate voltage of Qa is low, Qa is in an off state, and VDa is in an off state, and the gate voltage of Qb is high, in which condition Udc stores energy to the choke Lb through the switch tube Qb, and the choke La supplies constant current to the parallel resonant circuit networks L4 and C3, and the inductance L4 and the capacitance C3 resonate. In this embodiment, the limited current only needs to satisfy the diode turn-on current,<10mA current is enough, and the loss can be reduced. Udc/R =10 mA.
Most of wireless power transmission's mode, all be through the high frequency inverse series resonance or parallel resonance circuit transmission energy of closed loop, the frequency of the alternating current of high frequency contravariant will be the same with resonant frequency, and in order to prevent system resonant frequency's skew, generally need carry out the closed-loop control of frequency, then need extra hardware detection device and closed-loop control system, make it follow resonant frequency, the structure of device is more complicated, and volume and cost are bigger, and the utility model discloses use opening and shutting off of resonant network's inherent nature control switch pipe, need not control the frequency alright follow resonant frequency with the frequency that reaches the alternating current, simple structure, easily realization, and circuit cost significantly reduces.
As shown in fig. 3, the filter capacitor C4 and the inductor L5 are connected in series to form a series resonant circuit, the diode VD7 and the diode VD10 are connected in series to form a set of bridge arms of a rectifier bridge, and the diode VD8 and the diode VD9 are connected in series to form another set of bridge arms of the rectifier bridge. Two ends of a series resonance circuit consisting of the filter capacitor C4 and the inductor L5 are respectively connected with the anode of the diode VD7 and the anode of the diode VD 8. The anode of the energy storage capacitor C5 is connected to the cathode of the diode VD7, and the cathode is connected to the anode of the diode VD10, and is used as a filter capacitor for dc side output. The resonance receiving part is in series resonance and mainly comprises a receiving coil and a receiving capacitor, and the natural rectifying circuit mainly comprises four rectifying diodes VD7-VD10And a filter capacitor C4. The receiving coil receives the energy of the transmitting coil through electromagnetic induction and generates higher alternating voltage through the resonant network when the voltage U at two ends of the resonant network mn >0, diode VD7And VD9Is conducted to be an energy storage capacitor C5And a load for supplying power; when the voltage U is applied across the resonant network mn <0, diode VD8And VD10Is conducted and continues to be the energy storage capacitor C5Power is supplied to the load at the same time.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A wireless charging device for a household electric vehicle is characterized by comprising a power factor correction unit, a wireless transmitting unit and a wireless receiving unit;
the power factor correction unit is connected with an alternating current power supply and is used for carrying out voltage and current closed-loop control on the alternating current power supply so as to realize power factor correction; the wireless transmitting unit receives the current and voltage processed by the power factor correction unit and performs resonance control to realize the output of constant current power supply, and the wireless receiving unit outputs power supply for the load and the energy storage capacitor through resonance and rectification.
2. The wireless charging device for home electric vehicle as claimed in claim 1, wherein the power factor correction unit is a three-level bridge circuit.
3. The wireless charging device for the household electric vehicle as claimed in claim 2, wherein the three-level bridge circuit comprises three sets of bridge arms, each set of bridge arms is provided with an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm in the same set of bridge arms are simultaneously switched on or off.
4. The wireless charging device for the household electric vehicle as claimed in claim 3, wherein the upper bridge arm and the lower bridge arm are both diode circuits.
5. The wireless charging device for the household electric automobile as claimed in claim 4, wherein each set of the bridge arms is provided with a double switch, and two ends of the double switch are respectively connected with the midpoint of each bridge arm and the midpoint of the direct current side.
6. The wireless charging device for the household electric vehicle as claimed in claim 1, wherein the wireless transmitting unit comprises a self-excited inverter circuit and a parallel resonant circuit, the self-excited inverter circuit realizes the energy storage of different chokes and the energy storage or resonance of the parallel resonant circuit by controlling a switch.
7. The wireless charging device for the household electric vehicle as claimed in claim 6, wherein the self-excited inverter circuit is a bridge structure unit, the bridge structure unit comprises an upper bridge arm and a lower bridge arm which are connected in parallel, the upper bridge arm is an energy storage inductor and used for keeping constant current, and the lower bridge arm is a switching tube and used for controlling the self-excited inverter circuit.
8. The wireless charging device for home electric vehicle as set forth in claim 7, wherein said bridge structure unit comprises a choke coil L connected in series a And a choke coil L b And a parallel switch tube Q a And a switching tube Q b 。
9. The wireless charging device for household electric vehicles of claim 7, wherein the parallel resonant unit comprises an inductor L4 and a capacitor C3 connected in parallel.
10. The wireless charging device as claimed in claim 1, wherein the wireless receiving unit comprises a resonant receiving unit and a rectifying unit connected in series, the resonant receiving unit is in series resonance and comprises a receiving coil and a receiving capacitor, and the rectifying unit comprises four rectifying diodes VD7-VD10And a filter capacitor C4。
CN202022414538.0U 2020-10-27 2020-10-27 Wireless charging device for household electric automobile Expired - Fee Related CN213705192U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022414538.0U CN213705192U (en) 2020-10-27 2020-10-27 Wireless charging device for household electric automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022414538.0U CN213705192U (en) 2020-10-27 2020-10-27 Wireless charging device for household electric automobile

Publications (1)

Publication Number Publication Date
CN213705192U true CN213705192U (en) 2021-07-16

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Application Number Title Priority Date Filing Date
CN202022414538.0U Expired - Fee Related CN213705192U (en) 2020-10-27 2020-10-27 Wireless charging device for household electric automobile

Country Status (1)

Country Link
CN (1) CN213705192U (en)

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Granted publication date: 20210716