CN113328534B - Main and auxiliary coil combined voltage device of wireless electric energy receiving end - Google Patents
Main and auxiliary coil combined voltage device of wireless electric energy receiving end Download PDFInfo
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- CN113328534B CN113328534B CN202110884136.3A CN202110884136A CN113328534B CN 113328534 B CN113328534 B CN 113328534B CN 202110884136 A CN202110884136 A CN 202110884136A CN 113328534 B CN113328534 B CN 113328534B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
Abstract
The invention discloses a main and auxiliary coil combined voltage device of a wireless power receiving end, wherein the wireless power receiving end comprises at least one main coil (1) and at least one auxiliary coil (2), and electric energy received by the main coil passes through a main resonant circuit (3) and a main rectifier (4) and then is not modulated to form unmodulated main voltage (5); the electric energy received by the secondary coil is modulated by the secondary resonant circuit (6), the secondary rectifier (7) and the secondary DC converter (8) to form a modulated secondary voltage (9). The unmodulated main voltage and the modulated auxiliary voltage are connected in series to form a stable combined voltage (10) which is used as the output of a wireless power receiving end. In the device, only the electric energy on the secondary coil needs to be modulated by the direct current converter, and the electric energy on the primary coil does not need to be modulated by the converter, so that the volume and the loss of the converter are saved, the total volume of the device is reduced, and the circuit efficiency is improved.
Description
Technical Field
The invention relates to the field of wireless power transmission, in particular to a main coil and auxiliary coil combined voltage device at a receiving end.
Background
The wireless power transmission has wide application, such as portable electronic equipment, implanted human body electronic equipment, electric automobiles and the like. The wireless power transmission is composed of a transmitting end and a receiving end, wherein the receiving end is provided with an electromagnetic coil for capturing electromagnetic energy. Due to the uncertainty of the transmission of the radio energy, including the relative position and distance of the transmitting and receiving coils, and the load current condition, the electromagnetic energy reception changes, so that the output voltage cannot be maintained at a constant value. Therefore, the receiving end is usually equipped with a dc converter to achieve precise regulation of the output voltage. The dc converter is usually in the form of a buck voltage reduction circuit, a boost voltage boost circuit, an LDO linear regulator, etc., for example, a conventional receiving terminal based on the WPC Qi mobile phone wireless charging protocol is generally equipped with a voltage reduction type dc converter at the receiving terminal, so that the output voltage can be stabilized at a 5V standard voltage, but the voltage reduction circuit is responsible for the modulation of all electric energy, and may occupy a certain circuit space and generate electric energy loss.
Disclosure of Invention
The technical problem is as follows: in order to improve the efficiency and the integration level of a wireless electric energy receiving end, the invention provides a main coil and auxiliary coil combined voltage device of the wireless electric energy receiving end. This design may be used to place the total voltage in a modulated state by providing a portion of the primary voltage that is not modulated by the primary winding and another portion of the secondary voltage that is modulated by the secondary winding. The circuit part involved in the secondary voltage modulation, namely the DC converter, only needs to be responsible for modulating the energy flowing in the secondary coil, and the energy of the primary coil does not need to be modulated and does not need the DC converter. Therefore, the total loss of the circuit is reduced and the volume is reduced.
The technical scheme is as follows: in order to further improve the efficiency of a wireless electric energy receiving end and reduce the volume of the receiving end, the invention provides a main coil and auxiliary coil combined voltage device, compared with the common mode that all energy of the existing receiving end is modulated by a direct current converter, in the circuit, only the electric energy corresponding to the auxiliary coil is modulated by the auxiliary direct current converter, and the electric energy of the main coil does not need the direct current converter, so that the modulation power of the direct current converter is reduced, the circuit space is reduced, and the circuit efficiency is improved.
The wireless power transmitting terminal involved in the main and auxiliary coil combined voltage device of the wireless power receiving terminal of the invention is the same as the traditional wireless power transmitting terminal, and is not limited. The specific scheme of the receiving end is as follows:
the wireless electric energy receiving end comprises at least one main coil and at least one auxiliary coil, and the main coil, the main resonant circuit and the main rectifier are sequentially connected in series to output unmodulated main voltage; the secondary coil, the secondary resonant circuit, the secondary rectifier and the secondary direct-current converter are sequentially connected in series to output a modulated secondary voltage; the electric energy received by the main coil passes through the main resonant circuit and the main rectifier without being modulated to form unmodulated main voltage; the electric energy received by the secondary coil is modulated by the secondary resonant circuit, the secondary rectifier and the secondary direct-current converter to form a modulated secondary voltage; and after the unmodulated main voltage and the modulated auxiliary voltage are connected in series, the combined voltage is obtained and is used as the output of the wireless power receiving end.
And one or more primary coils or secondary coils of the wireless electric energy receiving end are respectively arranged.
The main coils are connected in series or in parallel to form a main coil group, and the main coil group is uniformly connected to the main resonant circuit and outputs an unmodulated main voltage through the main rectifier.
The main coil of the wireless power receiving end is formed by connecting a first main coil, a second main coil or a plurality of main coils in series or in parallel, and is respectively and correspondingly connected with a first set of main resonant circuit, a second set of main resonant circuit or a plurality of main resonant circuits, a first set of main rectifier, a second set of main rectifier or a plurality of main rectifiers, and outputs a first unmodulated main voltage, a second unmodulated main voltage or a plurality of unmodulated main voltages.
The plurality of secondary coils are connected in series or in parallel to form a secondary coil group, and the secondary coil group is connected to the secondary resonant circuit in a unified mode and outputs a modulation secondary voltage through the secondary rectifier and the secondary direct current converter.
The secondary coil group of the wireless power receiving end is formed by connecting a first secondary coil, a second secondary coil or a plurality of secondary coils in series or in parallel, and the secondary coil group is connected to a first set of secondary resonant circuit in a unified mode and outputs a first set of modulation secondary voltage through a first set of secondary rectifier and a first set of secondary direct current converter.
The plurality of secondary coils are respectively and correspondingly connected with the plurality of secondary resonant circuits, the plurality of secondary rectifiers and the secondary direct current converter, and a plurality of modulation secondary voltages are output.
The one or more unmodulated primary voltages and the one or more modulated secondary voltages are connected in series end-to-end to form a combined voltage, and the series connection sequence is not limited.
The auxiliary direct current converter takes the joint voltage as a control target, and a control system for controlling the auxiliary direct current converter is realized by an analog circuit formed by an operational amplifier, and the control system comprises the following specific steps:
the control system needs to set a target voltage, which is VcmdThe voltage value to which the combined voltage is intended is denoted Vout(ii) a The difference between the two is VerrI.e. by
Verr = Vcmd - Vout
VerrAfter the duty ratio is calculated, the duty ratio is output to be DC; after the duty ratio is input into the pulse width modulation module, a PWM waveform is generated and is used as a switching signal of a power electronic switching device and sent to the secondary direct current converter in the physical system equivalent model.
The physical system equivalent model comprises an auxiliary direct current converter, a modulated auxiliary voltage and an unmodulated main voltage, wherein the unmodulated main voltage is used as a system disturbance item for equivalent processing and is connected with the modulated auxiliary voltage in series in the physical system, so that a joint voltage V in the physical system equivalent modeloutIs the sum of the modulated secondary voltage and the unmodulated primary voltage.
According to the wireless electric energy receiving end device disclosed by the invention, only the electric energy on the secondary coil needs to be modulated by the direct current converter, and the electric energy on the primary coil does not need to be modulated by the converter, so that the size and the loss of the converter are saved, the total volume of the device is reduced, and the circuit efficiency is improved.
Drawings
Figure 1 is a circuit topology of the present invention comprising a single primary and a single secondary winding,
figure 2 shows an example of a control method of the secondary dc converter of the present invention,
figure 3 is an example of a design of a single primary and single secondary winding of the present invention,
fig. 4 shows an example of a circuit topology of the primary and secondary windings of the present invention.
The figure shows that: the device comprises a main coil 1, an auxiliary coil 2, a main resonant circuit 3, a main rectifier 4, an unmodulated main voltage 5, an auxiliary resonant circuit 6, an auxiliary rectifier 7, an auxiliary direct current converter 8, a modulated auxiliary voltage 9, a combined voltage 10 and a wireless power transmitting end 11.
A disc-type primary coil 301, a disc-type primary coil first port 302, a disc-type primary coil second port 303, a disc-type secondary coil 304, a disc-type secondary coil first port 305, a disc-type secondary coil second port 306.
A first primary winding 401, a second primary winding 402, a first secondary winding 403, a second secondary winding 404, a first set of primary resonant circuits 405, a first set of primary rectifiers 406, a first unmodulated primary voltage 407, and a second set of primary resonant circuits 408, a second set of primary rectifiers 409, a second unmodulated primary voltage 410, a first set of secondary resonant circuits 411, a first set of secondary rectifiers 412, a first set of secondary dc converters 413, a first set of modulated secondary voltages 414, a combined voltage 415 at the output of the circuits.
Detailed Description
The wireless electric energy receiving end comprises at least one main coil and at least one auxiliary coil, wherein electric energy received by the main coil passes through the main resonant circuit and the main rectifier without being modulated to form unmodulated main voltage; the electric energy received by the secondary coil is modulated by the secondary resonant circuit, the secondary rectifier and the secondary DC converter to form a modulated secondary voltage. And after the unmodulated main voltage and the modulated auxiliary voltage are connected in series, a combined voltage is obtained and is used as the output of the wireless power receiving end.
Certain uncertainty exists in wireless power transmission, and factors such as relative positions and distances of transmitting and receiving coils and load current cause output voltage to change, so that a direct current converter needs to be equipped to provide stable output voltage. The secondary DC converter used in the invention has the same topological structure as the conventional DC converter, but the control targets are different: the conventional dc converter modulates all the electric energy, and uses the output voltage of its own port as the control target, while the above-mentioned secondary dc converter modulates the electric energy received by the secondary coil, and uses the combined voltage as the control target.
Generally, the number of turns of the main coil is larger than that of the secondary coil or/and the electromagnetic receiving area is larger, so that most of energy of radio energy is received by the main coil, and a small part of energy is received by the secondary coil, which is beneficial to reducing the modulation power of the secondary direct current converter, and further beneficial to reducing the volume and improving the efficiency of the whole receiving end circuit.
The wireless power receiving end can also be provided with a plurality of coils which are connected in series and parallel to form a main coil group and an auxiliary coil group, and the coil groups are connected into the main resonant circuit, the auxiliary resonant circuit and the rectifier in a unified mode, or the coils are connected into the resonant circuits and the rectifier separately and respectively. In addition, an auxiliary direct current converter is required to be arranged behind the auxiliary rectifier. The circuit forms a plurality of unmodulated main voltages and modulated auxiliary voltages, and forms a combined voltage in a series connection mode to be used as the output of the wireless power receiving end.
Compared with the traditional single-coil wireless electric energy receiving end, although the single or multiple main receiving coils and auxiliary receiving coils are used, as long as the electric energy transmission total power of the coils is kept unchanged, the technical parameters such as the total number of turns of the coils, the area and the like can be kept the same as those of the original single coil. I.e. it can be seen as splitting a conventional single coil into several sub-coils. Therefore, the plurality of coils involved in the invention does not increase the volume of the whole receiving end circuit.
All of the primary and secondary coils described above should be physically fixed so that once the coils are manufactured, the coupling coefficient between the coils will not change and there will be no mutual movement between the coils. The invention has no special limitation on the specific relative position and fixing mode of the coil.
The unmodulated main voltage and the modulated auxiliary voltage are connected in series end to form a combined voltage, and the series connection sequence has a plurality of modes, including that the negative pole of the main voltage is connected in series with the positive pole of the auxiliary voltage, and the positive pole of the main voltage is connected in series with the negative pole of the auxiliary voltage; when there are multiple primary or secondary voltages, an interleaved series or series in any order may be made.
The wireless power receiving end of the present invention will be further described with reference to the accompanying drawings.
The wireless electric energy transmitting end 11 can adopt a universal transmitting end, and the receiving end comprises a main coil 1 and an auxiliary coil 2, wherein electric energy received by the main coil 1 passes through a main resonant circuit 3 and a main rectifier 4 and then is not modulated to form an unmodulated main voltage 5; the electric energy received by the secondary winding 2 is modulated by the secondary resonant circuit 6, the secondary rectifier 7 and the secondary dc converter 8 to form a modulated secondary voltage 9. The unmodulated main voltage 5 and the modulated auxiliary voltage 9 are connected in series to obtain a combined voltage 10, and the combined voltage is used as the output of the wireless power receiving end. The main resonant circuit 3 and the auxiliary resonant circuit 6 may be formed by passive components such as inductors and capacitors, and form resonant units with the main coil 1 and the auxiliary coil 2, respectively, and the topology may be a conventional wireless power transmission topology, such as LC series connection, LC parallel connection, and the like. The main rectifier 4 and the auxiliary rectifier 7 may adopt high-speed recovery diodes, such as schottky diodes, to form a full-bridge or half-bridge rectifier, and convert the ac power of the resonant unit into dc power, and the rectifier is equipped with a dc bus capacitor, so that the voltage ripple output by the rectifier is within an allowable range, and generally requires an output voltage of less than 5%. The secondary DC converter 8 may use buck, boost or other typical DC-DC switching circuit topologies, and perform modulation by MOSFET or other types of power electronic switching devices, which has the advantages of high efficiency and large ripple. The secondary dc converter 8 may also use a voltage regulator such as LDO, for example TI TPS7a45, which has the advantages of small ripple, low efficiency and low power. The invention does not limit the topology of the secondary DC converter 8, and can be comprehensively selected according to actual requirements.
The sub dc converter 8 takes the combined voltage as a control target. If an LDO regulator, such as TI TPS7a45, is used, the combined voltage is divided and then sent to the chip pins as a regulator feedback signal according to the chip manual, and the chip realizes a regulated output of the combined voltage. If a DC-DC switching circuit topology is used, a method for implementing the control system will be described below. The control system 200 can be implemented by an analog circuit formed by an operational amplifier, or by programming of a TI MSP430 or other microcontroller, as follows:
the control system needs to set a target voltage 201, which is measured as VcmdThis is the voltage value that the combined voltage 10 is intended to reach. In the actual operation process, the measured combined voltage 10 is obtained through feedback measurement and is counted as Vout. The difference 202 between the two can be found and is counted as VerrI.e. by
Verr = Vcmd - Vout
VerrAfter the operation, the output duty ratio 204 is calculated by the control module 203 and is counted as DC. The internal structure of the control module can be composed of typical PI, PID, voltage and current double-ring cascade PI and other control units.
The duty ratio 204 is input to the pulse width modulation block 205, and a PWM waveform is generated and sent to the sub dc converter 8 as a switching signal of the power electronic switching device. The unmodulated main voltage 5 in the physical system equivalent model 207 is treated equivalently as a system disturbance term and is connected with the modulated auxiliary voltage 9 in series in the physical system, so that the combined voltage V in the equivalent modeloutIs the sum of the two.
Generally, the number of designed turns of the main coil is larger than that of the secondary coil or/and the electromagnetic receiving area is larger, so that most of energy of radio energy is received by the main coil, and a small part of energy is received by the secondary coil, which is beneficial to reducing the modulation power of the secondary direct current converter, and further beneficial to reducing the volume and improving the efficiency of the whole receiving end circuit. It should be noted that the design of the main coil and the secondary coil is flexible, and the invention discloses a design example of the main coil in the outer coil and the secondary coil in the inner coil. The design uses high-frequency wires with circular cross sections, and generally, Litz wires are selected. The high frequency wires are coiled in the same plane to form a flat disc. The periphery of the disc is composed of a plurality of turns of disc type main coils 301, and electric energy is sent out through a first port 302 of the disc type main coils and a second port 303 of the disc type main coils. The inner part of the disc is composed of a disc type secondary coil 304 with a small number of turns, and the disc type secondary coil first port 305 and the disc type secondary coil second port 306 send out electric energy.
The wireless power receiving end can also be provided with a plurality of coils which are connected in series and parallel to form a main coil group and an auxiliary coil group, and the coil groups are connected into the main resonant circuit, the auxiliary resonant circuit and the rectifier in a unified mode, or the coils are connected into the resonant circuits and the rectifier separately and respectively. In addition, an auxiliary direct current converter is required to be arranged behind the auxiliary rectifier. The circuit forms a plurality of unmodulated main voltages and modulated auxiliary voltages, and forms a combined voltage in a series connection mode to be used as the output of the wireless power receiving end.
Compared with the traditional single-coil wireless electric energy receiving end, although the single or multiple main receiving coils and auxiliary receiving coils are used, as long as the electric energy transmission total power of the coils is kept unchanged, the technical parameters such as the total number of turns of the coils, the area and the like can be kept the same as those of the original single coil. I.e. it can be seen as splitting a conventional single coil into several sub-coils. Therefore, the plurality of coils involved in the invention does not increase the volume of the whole receiving end circuit.
All of the primary and secondary coils described above should be physically fixed so that once the coils are manufactured, the coupling coefficient between the coils will not change and there will be no mutual movement between the coils. The invention has no special limitation on the specific relative position and fixing mode of the coil.
The unmodulated main voltage and the modulated auxiliary voltage are connected in series end to form a combined voltage, and the series connection sequence has a plurality of modes, including that the negative pole of the main voltage is connected in series with the positive pole of the auxiliary voltage, and the positive pole of the main voltage is connected in series with the negative pole of the auxiliary voltage; when there are multiple primary or secondary voltages, an interleaved series or series in any order may be made. Therefore, the connection form of the circuit is flexible. To further illustrate the connection mode in the case of multiple windings, this invention provides a topology example for the receiving end containing two primary windings, i.e. the first primary winding 401 and the second primary winding 402, and two secondary windings, i.e. the first secondary winding 403 and the second secondary winding 404. The first main winding 401 and the second main winding 402 are respectively connected to a first set of circuits and a second set of circuits, and include a first set of main resonant circuit 405 and a first set of main rectifier 406 to form a first unmodulated main voltage 407, and a second set of main resonant circuit 408 and a second set of main rectifier 409 to form a second unmodulated main voltage 410. The first secondary winding 403 and the second secondary winding 404 are connected in series to form a winding set, and are collectively connected to a first set of secondary resonant circuits 411, a first set of secondary rectifiers 412, and a first set of secondary dc converters 413 to form a first set of modulated secondary voltages 414. The first unmodulated main voltage 407, the second unmodulated main voltage 410, and the first set of modulated sub-voltages 414 are connected in series to obtain a combined voltage 415 at the output of the circuit. In this example, a series sequence of voltages of the second unmodulated main voltage 410, the first set of modulated secondary voltages 414, and the first unmodulated main voltage 407 from low to high potential is used.
Claims (9)
1. The utility model provides a voltage device is united to main and auxiliary coil of wireless power receiving terminal which characterized in that: the wireless electric energy receiving end comprises at least one main coil (1) and at least one auxiliary coil (2), wherein the main coil (1), a main resonant circuit (3) and a main rectifier (4) are sequentially connected in series to output unmodulated main voltage (5); the secondary coil (2), the secondary resonant circuit (6), the secondary rectifier (7) and the secondary DC converter (8) are sequentially connected in series to output a modulated secondary voltage (9); the electric energy received by the main coil (1) passes through the main resonant circuit (3) and the main rectifier (4) and then forms an unmodulated main voltage (5) without modulation; the electric energy received by the secondary coil (2) is modulated by a secondary resonant circuit (6), a secondary rectifier (7) and a secondary direct current converter (8) to form a modulated secondary voltage (9); the unmodulated main voltage (5) and the modulated auxiliary voltage (9) are connected in series to obtain a combined voltage (10) which is used as the output of a wireless power receiving end;
the auxiliary direct current converter (8) takes the joint voltage (10) as a control target, and a control system (200) for controlling the auxiliary direct current converter (8) is realized by an analog circuit formed by an operational amplifier, and the control system specifically comprises the following steps:
the control system (200) requires a target voltage (201) to be set, measured as VcmdThe voltage value to which the combined voltage (10) is intended is denoted Vout(ii) a The difference (202) is measured as VerrI.e. by
Verr = Vcmd - Vout
VerrAfter the input signal is sent to a control module (203) and calculated, a duty ratio (204) is output and is counted as DC; the duty ratio (204) is input into a pulse width modulation module (205), and then a PWM waveform is generated and sent to a secondary direct current converter (8) in an equivalent model (207) of a physical system as a switching signal of a power electronic switching device.
2. The primary and secondary coil combined voltage device of the wireless power receiving end according to claim 1, wherein: the number of the main coil (1) or the auxiliary coil (2) at the wireless electric energy receiving end is one or more.
3. The primary and secondary coil combined voltage device of the wireless power receiving end as claimed in claim 2, wherein: the main coils are connected in series or in parallel to form a main coil group, and the main coil group is uniformly connected to the main resonant circuit and outputs an unmodulated main voltage through the main rectifier.
4. The primary and secondary coil combined voltage device of the wireless power receiving end as claimed in claim 2, wherein: the main coil of the wireless power receiving end is formed by connecting a first main coil (401), a second main coil (402) or more than two main coils in series or in parallel, and is respectively and correspondingly connected with a first set of main resonant circuit (405), a second set of main resonant circuit (408) or more than two main resonant circuits, a first set of main rectifier (406), a second set of main rectifier (409) or more than two main rectifiers, and outputs a first unmodulated main voltage (407), a second unmodulated main voltage (410) or more than two unmodulated main voltages.
5. The primary and secondary coil combined voltage device of the wireless power receiving end as claimed in claim 2, wherein: the plurality of secondary coils are connected in series or in parallel to form a secondary coil group, and the secondary coil group is connected to the secondary resonant circuit in a unified mode and outputs a modulation secondary voltage through the secondary rectifier and the secondary direct current converter.
6. The primary and secondary coil combined voltage device of the wireless power receiving end as claimed in claim 5, wherein: the secondary coil group of the wireless power receiving end is formed by connecting a first secondary coil (403), a second secondary coil (404) or more than two secondary coils in series or in parallel, and the secondary coil group is connected to a first set of secondary resonant circuit (411) in a unified mode and outputs a first set of modulation secondary voltage (414) through a first set of secondary rectifier (412) and a first set of secondary direct current converter (413).
7. The primary and secondary coil combined voltage device of the wireless power receiving end as claimed in claim 2, wherein: the plurality of secondary coils are respectively and correspondingly connected with the plurality of secondary resonant circuits, the plurality of secondary rectifiers and the secondary direct current converter, and a plurality of modulation secondary voltages are output.
8. The primary and secondary coil combined voltage device of the wireless power receiving end according to claim 3, 4, 5, 6 or 7, wherein: the one or more unmodulated primary voltages and the one or more modulated secondary voltages are connected in series end-to-end to form a combined voltage, and the series connection sequence is not limited.
9. The primary and secondary coil combined voltage device of the wireless power receiving end according to claim 1, wherein: the equivalent model (207) of the physical system comprises an auxiliary direct current converter (8), a modulated auxiliary voltage (9) and an unmodulated main voltage (5), wherein the unmodulated main voltage (5) is equivalently treated as a system disturbance term and is connected with the modulated auxiliary voltage (9) in series in the physical system, so that a combined voltage V in the equivalent model (207) of the physical systemoutIs the sum of the modulated secondary voltage (9) and the unmodulated primary voltage (5).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107078555A (en) * | 2014-10-31 | 2017-08-18 | 富士通株式会社 | Current collector and power transmission system |
| WO2017172223A1 (en) * | 2016-03-31 | 2017-10-05 | Intel Corporation | Impedance matching multiple coils in an electronic device |
| CN108347101A (en) * | 2017-01-22 | 2018-07-31 | 立锜科技股份有限公司 | Multi-mode radio power supply receiving circuit and its control method |
| CN110386008A (en) * | 2019-06-27 | 2019-10-29 | 中国电力科学研究院有限公司 | A kind of electric car wireless charging method and system based on double transmitting-bis- pickup modes |
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2021
- 2021-08-03 CN CN202110884136.3A patent/CN113328534B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107078555A (en) * | 2014-10-31 | 2017-08-18 | 富士通株式会社 | Current collector and power transmission system |
| WO2017172223A1 (en) * | 2016-03-31 | 2017-10-05 | Intel Corporation | Impedance matching multiple coils in an electronic device |
| CN108347101A (en) * | 2017-01-22 | 2018-07-31 | 立锜科技股份有限公司 | Multi-mode radio power supply receiving circuit and its control method |
| CN110386008A (en) * | 2019-06-27 | 2019-10-29 | 中国电力科学研究院有限公司 | A kind of electric car wireless charging method and system based on double transmitting-bis- pickup modes |
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