CN212114902U - Wireless transmission device and wireless receiving device - Google Patents
Wireless transmission device and wireless receiving device Download PDFInfo
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- CN212114902U CN212114902U CN201922017310.5U CN201922017310U CN212114902U CN 212114902 U CN212114902 U CN 212114902U CN 201922017310 U CN201922017310 U CN 201922017310U CN 212114902 U CN212114902 U CN 212114902U
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- inverter
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- transmission device
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model relates to a wireless transmission device, include: a DC power supply connected to the inverter to supply DC power; a resonant circuit formed by connecting a variable capacitor and a coil in series; an inverter connected to the DC power supply and the resonant tank, respectively; and a controller connected to the resonant tank and the inverter, respectively, to perform control, the variable capacitor including a switch.
Description
Technical Field
The utility model relates to a wireless transmission device and wireless receiving device especially relate to no matter how the operating mode homoenergetic keeps constant frequency work and can reduce reactive power's wireless transmission device and wireless receiving device.
Background
With the rapid development of intelligent technology, various robots and mobile terminals are widely applied in the current society, the convenience of electric energy supply is urgently needed, and the trend that an electric energy transmission mode is changed from conductive charging to non-conductive charging is shown. In recent years, an inductive power transmission technology based on a magnetic resonance working principle is widely applied to charging technologies of smart phones, electric automobiles and the like.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved by the utility model
However, in practical application scenarios, the change of the relative position between the transmitting coil and the receiving coil for inductive power transmission may cause the change of the self inductance of the coil and the mutual inductance between the coils, so that the coils generate reactive power, the transmission efficiency is reduced, and excessive power waste is caused.
Technical solution for solving technical problem
The utility model discloses can accomplish in view of above-mentioned problem, the utility model discloses a first aspect lies in, provides a wireless transmission device, a serial communication port, include:
a DC power supply connected to the inverter to supply DC power;
a resonant circuit formed by connecting a variable capacitor and a coil in series;
an inverter connected to the DC power supply and the resonant tank, respectively; and
a controller connected to the resonant tank and the inverter, respectively, for control,
the variable capacitor includes a switch.
A second aspect of the present invention provides a wireless transmission device, including:
a DC power supply connected to the inverter to supply DC power;
the resonance circuit is formed by connecting a capacitor and a coil in series, and the coil is an inductance variable coil;
an inverter connected to the DC power supply and the resonant tank, respectively; and
and the controller is respectively connected with the resonant circuit and the inverter for controlling.
A third aspect of the present invention provides a wireless transmission device, comprising:
a DC power supply connected to the inverter to supply DC power;
a resonant circuit formed by connecting a variable capacitor and a coil in series, the coil having a variable inductance;
an inverter connected to the DC power supply and the resonant tank, respectively; and
a controller connected to the resonant tank and the inverter, respectively, for control,
at least one of the variable capacitor and the coil includes a switch.
The fourth aspect of the present invention is directed to the above-described wireless transmission device according to the first to third aspects, wherein the receiver of the energy transmission of the wireless transmission device does not have a variable capacitor.
A fifth aspect of the present invention is to provide a wireless receiving apparatus, which receives the wireless transmission of the wireless transmission apparatus according to the first aspect to the fourth aspect.
Effect of the utility model
The utility model relates to a wireless transmission device and wireless receiving device no matter how the operating mode homoenergetic keeps constant frequency work and can reduce reactive power. Thereby reducing the generation of electromagnetic interference to surrounding electronic equipment.
Therefore, the system energy conversion and transmission efficiency can be improved, and the waste of the electric energy source is reduced. Because the high-efficiency transmission under different working conditions is realized, the working range is also improved.
Drawings
Fig. 1 is a diagram showing an overall configuration of a radio transmission device 1 according to the present invention.
Fig. 2(a) to 2(c) show three different operating conditions of the wireless transmission device 1 and the receiving unit 1'.
Fig. 3 is a diagram showing steps of a radio transmission method according to the present invention.
Fig. 4(a) to 4(c) are views each showing a variable capacitance Cr according to the present invention and a specific configuration of the variable capacitance Cr.
Fig. 5 is a diagram showing an overall configuration of the radio transmission device 1 and the receiving unit 1' according to the present invention.
Detailed Description
In the following, preferred embodiments of the radio transmission device 1 according to the present invention will be described with reference to the drawings, but the same or corresponding parts will be described with the same reference numerals in the drawings.
Detailed description of the preferred embodiments
Fig. 1 is a diagram showing an overall configuration of a radio transmission device 1 according to the present invention. As shown in fig. 1, the wireless transmission device 1 includes a dc power supply 2, an inverter 3, a controller 4, an inductor (coil) Lr, and a variable capacitor Cr.
Both ends of the DC power supply 2 are respectively connected with an inverter 3 to provide DC voltage VDCA series resonant circuit of an inductor Lr and a variable capacitor Cr is connected between both ends of the inverter 3. In addition, the controller 4 outputs the control command QinvAnd QCThe inverter 3 and the variable capacitor Cr of the wireless transmission device 1 are controlled so that the inverter 3 is controlled according to the control signal Q of the controller 4invThe DC voltage V from the DC power supply 2DCThe alternating current is converted into alternating current through PWM control and flows through inductors Lr and Cr, an alternating current Ir flows through the inductors Lr, an alternating magnetic field is generated and sent to a receiving part, wireless transmission is realized, and the receiving part receives energy from the alternating electromagnetic field in the air.
The inductor Lr may be a litz wire coil, a PCB coil, or the like, and may be formed by selecting various types of coils, and the back surface of the inductor Lr may be provided with ferrite to realize magnetic shielding.
The control of the variable capacitance Cr will be described in detail below.
The controller 4 is based on the control signal QinvThe phase relation with the alternating current Ir is detected to control the capacitance value of the variable capacitor CrSo that the resonant frequency f of the resonant circuit in the wireless transmission device 1 is caused by the change of the working conditions of the wireless transmission device 1 and the receiving part 1rWhen the capacitance value of the variable capacitance Cr changes, the resonance frequency f is corrected by correcting the capacitance value of the variable capacitance CrrModified to the switching frequency f of the AND systemsAnd (4) the same. So that fN＝1。
fN＝fs/fr… … (formula 1)
Specifically, in the operating condition of fig. 2(a), the wireless transmission device 1 and the receiving unit 1' not shown are in an aligned state, specifically, their respective electromagnetic coils are in an aligned state. In this case, the control signal QinvIn phase with the alternating current Ir, i.e. without phase difference, at which time the reactive power is minimal, i.e. in an ideal state, f N1. The capacitance value of the variable capacitor Cr does not need to be corrected.
Next, in the operating condition of fig. 2(b), that is, the wireless transmission device 1 and the receiving part 1' are changed from the aligned state to the separated state, specifically, the electromagnetic coils thereof are in the separated state. In this case, the control signal Q in this case is such that the coupling between the electromagnetic coils of the wireless transmission device 1 and the reception unit 1' is weakened by the change in the relative positions of the two electromagnetic coils, and the self-inductance of the electromagnetic coils is reducedinvLeading the phase of the alternating current Ir, in which case reactive power is generated, fN> 1, for correction of fNThe controller 4 decreases the capacitance value of the variable capacitance Cr to increase f according to the following expression (2) 1rTo reduce fNThe correction is 1. In this example, the wireless transmission device 1 and the reception unit 1 ' are shown to be in a separated state from an aligned state, and similarly, when the wireless transmission device 1 and the reception unit 1 ' are in a displaced state from an aligned state, the electromagnetic coils of the wireless transmission device 1 and the reception unit 1 ' are also weakened in coupling between the two electromagnetic coils due to a change in the relative positions, the self-inductance of the electromagnetic coils is reduced, and the correction is made to fNThe controller 4 also decreases the capacitance value of the variable capacitance Cr to increase f according to the following expression (2) as well as 1rTo reduce fNThe correction is 1.
In the operation condition of fig. 2(c), the wireless transmission device 1 and the receiving unit 1' are in a close state, specifically, their respective electromagnetic coils are in a close state. In this case, the electromagnetic coils of the wireless transmission device 1 and the reception unit 1' become strong in coupling between the two electromagnetic coils due to the change in the relative positions, and the self-inductance of the electromagnetic coils becomes large, whereby the control signal Q becomes largeinvLagging the phase of the alternating current Ir, in which case reactive power is generated, fN< 1 for correction of fNThe controller 4 increases the capacitance value of the variable capacitance Cr to decrease f according to the expression (2) aboverTo increase fNThe correction is 1.
Thereby, according to the control signal Q, the controller 4invThe phase relation with the alternating current Ir is such that f is always maintainedNThe reactive power in the electromagnetic coils of the wireless transmission device 1 and the receiving part 1' can be reduced by 1, thereby improving the energy conversion and transmission efficiency of the system and reducing the waste of electric energy.
In addition, since f is always madeN1, i.e. fr＝fsDue to a switching frequency of fsIs constant, thus making f N1, i.e. such that the resonant frequency f of the resonant circuit in the wireless transmission device 1rThe constant is always kept, so that the electromagnetic interference generated to surrounding electronic equipment can be reduced on the basis of reducing reactive power. High-efficiency transmission under different working conditions is realized, and the working range is enlarged.
Fig. 3 is a diagram showing steps of a radio transmission method according to the present invention. Next, a radio transmission method according to the present invention will be described with reference to fig. 3.
In step 101, control signal Q is assertedinvAnd detecting the phase of the alternating current Ir and judging the relationship between the phases. If the control signal QinvIn phase with the alternating current Ir, the process proceeds to step 103 to maintain the capacitance of the variable capacitor Cr and proceeds to step 101 to continue to control the control signal QinvThe phase relation with the alternating current Ir is monitored.
If the control signal QinvIs ahead of the alternating current Ir, the process proceeds to step 102, where the capacitance of the variable capacitor Cr is decreased to increase f according to the above equations (1) and (2)rTo reduce fNThe correction is 1. Thereafter, transition is made to 101 to continue on to control signal QinvThe phase relation with the alternating current Ir is monitored.
If the control signal QinvLags behind the alternating current Ir, the process proceeds to step 104, where the capacitance of the variable capacitor Cr is increased to decrease f according to the above equations (1) and (2)rTo increase fNThe correction is 1. Thereafter, the process shifts to step 101 to continue to control the signal QinvThe phase relation with the alternating current Ir is monitored.
In addition, the controller 4 of the wireless transmission device 1 according to the present invention is based on the control signal QinvAnd the phase relation of the alternating current Ir in the control signal QinvIn the case where the phase relation with the alternating current Ir is advanced or retarded, f is set by controlling the capacitance value of the variable capacitor CrNThe correction is 1. However, in practice, f may be caused by tolerance, error, noise, etc. between the devicesNCannot be perfectly corrected to 1, and furthermore, to avoid fNIn the case of < 1, i.e. the control signal QinvIn the case where the phase of (f) lags behind the phase of the alternating current Ir, each switching device of the inverter 3 operates in a hard switching state, as compared with fNIn the case of > 1, since the voltage stress and the switching loss borne by each switching device of the inverter 3 are large and the switching device is easily damaged, it is preferable to set f with a suitable redundancyN≧ 1, e.g., 1.1 ≧ fNNot less than 1, i.e. about 10% redundancy, the redundancy value is not limited to this, and it can be adjusted by those skilled in the art according to the actual situation, for example, 1.2 not less than fNNot less than 1. Further, the art is skilled inThe person may also adjust f within the above range according to the actually required output power, output voltage, output current, etcNAdjustments are made to achieve the desired output power, output voltage, output current, etc.
Further, the present invention relates to a wireless transmission device 1 that corrects the resonant frequency f by providing a variable capacitance Cr and changing the capacitance value of the variable capacitance Crr. Of course, the resonant frequency f may be corrected by providing a variable inductor and changing the inductance of the variable inductor according to the above equations (1) and (2)r. Alternatively, the resonance frequency f may be corrected by providing both a variable inductor and a variable capacitor and changing at least one of the capacitance value of the variable capacitor and the inductance value of the variable inductorrThe same effects as described above can be achieved.
Further, as shown in fig. 4(a) and 4(b), fig. 4(a) and 4(b) respectively show an example of the variable capacitance Cr according to the present invention and a specific structure of the variable capacitance Cr, and as shown in fig. 4(b), the variable capacitance Cr is formed by a capacitor Cr1Capacitor Cr0And a switch S1 controlled by PWM. Wherein, the switch S1And a capacitor Cr0In series, the series circuit thus obtained and a capacitor Cr1And (4) connecting in parallel. Thereby, by the pair of switches S1The PWM control is performed to control the variable capacitance Cr. The structure of the variable capacitor Cr is not limited thereto, and it is possible for those skilled in the art to make various changes as needed. In the state of passing through the pair of switches S1When the variable capacitor Cr is adjusted by PWM control, the capacitance value of the variable capacitor Cr is continuous, and the size of the variable capacitor Cr can be controlled with high accuracy, so that the resonant frequency can be controlled with high accuracy, and the controllability and flexibility of the voltage conversion gain Gv of the converter can be improved. In addition, by setting the frequency of PWM control of the variable capacitance in proportion to the switching frequency of the inverter 3, the switch S of the variable capacitance can be realized1The soft switch of (1) improves the reliability of the device, and significantly reduces electromagnetic interference, thereby more reliably improving the wireless transmission efficiency of the wireless transmission device 1. And, due to the adoption of PWM controlUnder the condition of making and taking the soft switch working state, the size of the variable capacitor Cr and the control signal QcHas a monotonic relationship and therefore also facilitates control of the converter gain.
As shown in fig. 4(c), the two transistors T1 and T2 may be used to form a switch, the two PWM control sources PWM1 and PWM2 may be used to control the transistors T1 and T2, respectively, and when the two PWM control sources are used, parameters such as duty ratios and phase differences of the two PWM control sources may be adjusted to make the transistors T1 and T2 in a soft-switching operation state, thereby preventing the transistors from being in a hard-switching operation state and causing device damage.
As described above, in the case where the resonance circuit of the wireless transmission device 1 according to the present invention includes the variable capacitance Cr, as shown in fig. 5, it is preferable that the receiver 1' receiving the energy transmission of the wireless transmission device 1 does not include a phase adjusting device such as a variable capacitance or a variable inductance, since the circuit of the receiver becomes simple, thereby achieving a low cost and a small size easily, and on the other hand, when the receiver does not include a phase adjusting device such as a variable capacitance or a variable inductance, as in the case of the wireless transmission device 1 according to the present invention, the receiver selects the variable capacitance Cr so that f is set to be equal to fNWhen the capacitance value of the variable capacitor Cr is more than or equal to 1, the obtained capacitance value of the variable capacitor Cr and the voltage gain of the system (namely the voltage at two ends of the equivalent load Req and the input voltage V)DCHas a monotonous relation with the control signal Q of the inverter 3, and the capacitance value of the variable capacitance Cr has a monotonous relation with the control signal Q of the inverter 3invThe phase difference from the alternating current Ir also has a monotonic relationship, and therefore it is advantageous to control the system. Similarly, the same effect can be obtained even when the receiving unit has a variable capacitance or a variable inductance and the transmitting unit does not have a variable capacitance or a variable inductance.
In addition, the utility model provides a switching frequency fsIs a constant value, while in practical circuits the switching frequency f may be due to component tolerances and the likesA small amplitude excursion will occur which is allowed without affecting the normal operation of the device, whereby this can be achievedThe switching frequency f is also adjusted while changing the variable capacitor CrsCarry out the control of small-amplitude in order to realize required output power, output current, output voltage etc to control output power, output current, output voltage etc. more freely, make the utility model relates to a wireless transmission device can high-efficient transmission energy in the time, can also enlarge working range, realizes dual technological effect.
In addition, the present invention can freely combine the respective embodiments, or appropriately modify or omit the respective embodiments within the scope of the novel practical application.
The present invention has been described in detail, but the above description is only an example in all aspects, and the present invention is not limited thereto. Countless variations not illustrated are to be construed as conceivable without departing from the scope of the present invention.
Industrial application
The utility model relates to a but wireless transmission device and wireless receiving arrangement wide application in large and small scale wireless power transmission, receipt, for example cell-phone charges, electric automobile charges etc..
Description of the reference symbols
1: wireless transmission device
1': receiving part
2: direct current power supply
3: inverter with a voltage regulator
4: controller
Lr: inductor (coil)
Cr: a variable capacitance.
Claims (5)
1. A wireless transmission apparatus, comprising:
a DC power supply connected to the inverter to supply DC power;
a resonant circuit formed by connecting a variable capacitor and a coil in series;
an inverter connected to the DC power supply and the resonant tank, respectively; and
a controller connected to the resonant tank and the inverter, respectively, for control,
the variable capacitor includes a switch.
2. A wireless transmission apparatus, comprising:
a DC power supply connected to the inverter to supply DC power;
the resonance circuit is formed by connecting a capacitor and a coil in series, and the coil is an inductance variable coil;
an inverter connected to the DC power supply and the resonant tank, respectively; and
and the controller is respectively connected with the resonant circuit and the inverter for controlling.
3. A wireless transmission apparatus, comprising:
a DC power supply connected to the inverter to supply DC power;
a resonant circuit formed by connecting a variable capacitor and a coil in series, the coil having a variable inductance;
an inverter connected to the DC power supply and the resonant tank, respectively; and
a controller connected to the resonant tank and the inverter, respectively, for control,
at least one of the variable capacitor and the coil includes a switch.
4. The wireless transmission apparatus according to any one of claims 1 to 3,
the receiver receiving the energy transmission of the wireless transmission device does not have a variable capacitor.
5. A wireless receiving apparatus, characterized in that it receives the wireless transmission of the wireless transmitting apparatus according to claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922017310.5U CN212114902U (en) | 2019-11-20 | 2019-11-20 | Wireless transmission device and wireless receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922017310.5U CN212114902U (en) | 2019-11-20 | 2019-11-20 | Wireless transmission device and wireless receiving device |
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| Publication Number | Publication Date |
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| CN212114902U true CN212114902U (en) | 2020-12-08 |
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| CN201922017310.5U Active CN212114902U (en) | 2019-11-20 | 2019-11-20 | Wireless transmission device and wireless receiving device |
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| CN (1) | CN212114902U (en) |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220620 Address after: 201306 building C, No. 888, Huanhu West 2nd Road, Lingang New Area, Pudong New Area, Shanghai Patentee after: Xinxin Technology (Shanghai) Co.,Ltd. Address before: 201210 Room 302, No.95, Lane 2281, Zhangdong Road, Pudong New Area, Shanghai Patentee before: Li Jianting |
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| TR01 | Transfer of patent right |