CN118337183B - Virtual capacitor series tuning device suitable for low-frequency electromagnetic emission system - Google Patents
Virtual capacitor series tuning device suitable for low-frequency electromagnetic emission system Download PDFInfo
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Abstract
The application relates to the technical field of low-frequency electromagnetic emission, and discloses a virtual capacitor series tuning device suitable for a low-frequency electromagnetic emission system, which aims to solve the problems that a high-voltage capacitor in the series tuning device is huge in consumption and inflexible in adapting to a working frequency point. The device comprises a plurality of serially connected virtual capacitor serial tuning modules, wherein each virtual capacitor serial tuning module comprises a short-circuit switch, an access switch, a single-phase coupling transformer, a single-phase full bridge and a supporting capacitor; the support capacitor is connected with the direct current side of the single-phase full bridge, the alternating current side of the single-phase full bridge is connected with the secondary side of the single-phase coupling transformer, the primary side of the single-phase coupling transformer is connected in series with the low-frequency electromagnetic emission system through the access switch, the serial tuning module is connected with the position of the low-frequency electromagnetic emission system in parallel with the short-circuit switch, and the access switch and the short-circuit switch are used for controlling the virtual capacitor serial tuning module to be connected with and cut out of the low-frequency electromagnetic emission system in a matched mode. The device can flexibly adapt to the working frequency point and the resonance state of the low-frequency electromagnetic emission system.
Description
Technical Field
The application relates to the technical field of low-frequency electromagnetic emission, in particular to a virtual capacitor series tuning device suitable for a low-frequency electromagnetic emission system.
Background
The low-frequency electromagnetic transmitting system comprises a sine wave excitation current source, a series tuning device, a transmitting antenna and the like. The high-voltage capacitor group is used as an important component of the series tuning device and is connected between the sine wave excitation current source and the transmitting antenna in series, and the series tuning device is used for constructing a series resonance state to offset the inductive component of the impedance of the transmitting antenna, so that the output voltage stress of the sine wave excitation current source is reduced, and the maximum power output capacity of the sine wave excitation current source is better utilized.
At present, the series tuning device is limited by capacitor materials and the technological level, and a plurality of capacitors are required to be connected in series and parallel in the series tuning device so as to improve the voltage-resistant capability and the current-passing capability of the high-voltage capacitor group. In practical application, the series tuning device needs to configure the connection state of the high-voltage capacitor group according to the conditions of the working frequency point, the capacity value required by series tuning, the working current and the like.
However, the tuning system in which a plurality of capacitors are connected in series and in parallel inside the series tuning device has the following drawbacks: when the working frequency points are more, the number of high-voltage capacitors is huge, and the demand for placement space is huge; when the working frequency point is adjusted, the fixed high-voltage capacitor bank is more difficult to meet tuning requirements, and additional capacitor banks are required to be configured, so that additional cost is increased.
Disclosure of Invention
In order to solve the problems that the high-voltage capacitor in the series tuning device is huge in dosage and inflexible in adapting to working frequency points, the invention provides a virtual capacitor series tuning device suitable for a low-frequency electromagnetic emission system. The device flexibly adjusts the output voltage waveform of the virtual capacitor series tuning device according to the information such as the working frequency point, the working current, the reactance of the transmitting antenna and the like of the low-frequency electromagnetic transmitting system, and meets the tuning requirement of the virtual series tuning device for flexibly adapting to the low-frequency electromagnetic transmitting system under different working frequency points.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a virtual capacitor series tuning apparatus adapted for use in a low frequency electromagnetic transmission system, the apparatus comprising a plurality of virtual capacitor series tuning modules connected in series, the virtual capacitor series tuning modules comprising a shorting switch, an access switch, a single-phase coupling transformer, a single-phase full bridge and a supporting capacitor; the supporting capacitor is connected with the direct current side of the single-phase full bridge, the alternating current side of the single-phase full bridge is connected with the secondary side of the single-phase coupling transformer, and the primary side of the single-phase coupling transformer is connected in series with the low-frequency electromagnetic emission system through the access switch; the series tuning module is connected with a short-circuit switch in parallel at the position of the low-frequency electromagnetic emission system, and the access switch and the short-circuit switch are used for controlling the virtual capacitor series tuning module to be connected with and cut out of the low-frequency electromagnetic emission system in a matching mode.
Further, the single-phase full bridge includes a two-level single-phase full bridge or a multi-level single-phase full bridge.
Further, in the case where the single-phase full bridge is a two-level single-phase full bridge, the single-phase full bridge includes two H-bridges, each of which includes two diodes connected in series and two switches connected in series, the support capacitance includes two support capacitances connected in series, a midpoint of the two switches connected in series is connected to a secondary side of the single-phase coupling transformer, and the two diodes connected in series and the two support capacitances connected in series are connected in parallel.
Further, the equivalent capacitance of the virtual capacitance series tuning device is:
，
Wherein, Is the effective value of the working current of the low-frequency electromagnetic emission system,Is the effective value of the output voltage of the virtual capacitor series tuning device,Is the operating frequency of the low frequency electromagnetic transmission system.
Further, the maximum value of the effective value of the output voltage of the virtual capacitor series tuning device is determined by the effective value of the working current of the low-frequency electromagnetic transmission system and the equivalent inductance component of the transmitting antenna of the low-frequency electromagnetic transmission system.
Further, when the effective value of the output voltage of the virtual capacitor series tuning device reaches the maximum value, the equivalent capacitance of the virtual capacitor series tuning device is:
，
Wherein, Is the equivalent inductive component of the transmitting antenna.
Further, the working current phase of the virtual capacitor series tuning device advances the output voltage phase by 90 degrees, the output voltage phase of the virtual capacitor series tuning device is 180 degrees different from the voltage phase of the equivalent inductance component of the transmitting antenna of the low-frequency electromagnetic transmitting system, and the sum of the output voltage phase of the virtual capacitor series tuning device and the voltage phase of the equivalent inductance component of the transmitting antenna is zero.
According to a second aspect of the present invention, there is also provided a control system of a virtual capacitor series tuning device, including a control module and the virtual capacitor series tuning device, where the control module includes:
the phase-locked loop is used for phase-locking the secondary side current of the single-phase coupling transformer;
the phase delay module is used for carrying out pi/2 phase delay on the output of the phase-locked loop, and the phase obtained by delay is used as a phase reference;
A first voltage controller whose input is a difference between a voltage of the support capacitor and a voltage reference of the support capacitor, and whose output is a phase adjustment amount; the phase adjustment quantity is overlapped with the phase reference to obtain the phase of the single-phase full-bridge modulation wave;
The second voltage controller is input into a difference value between the effective value of the output voltage of the single-phase full bridge and the reference value of the effective value of the output voltage of the single-phase full bridge, and the output of the second voltage controller is a modulation ratio which is used as the modulation ratio of the single-phase full bridge modulation wave;
And the sinusoidal signal generation module is used for generating the single-phase full-bridge modulation wave of the virtual capacitor series tuning module according to the single-phase full-bridge modulation wave phase and the single-phase full-bridge modulation wave modulation ratio.
The control system of the virtual capacitor series tuning device also comprises a modulation module, wherein the modulation module comprises a triangular wave generator and a comparator; the number of the triangular wave generators is 2n, the triangular wave waveforms output by each circuit are the same, the phase difference is 360 degrees/2 n, and n is the number of virtual capacitor series tuning modules included in the virtual capacitor series tuning device; the number of the comparators is the same as the number of the triangular wave generators, each comparator corresponds to one path of the triangular wave generator and is used for comparing the voltage of the single-phase full-bridge modulation wave with the voltage of the triangular wave output by each path of the triangular wave generator respectively and outputting the output voltage of the virtual capacitor series tuning module.
Further, the modulation module adopts unipolar frequency multiplication modulation, the single-phase full bridge comprises a first H bridge and a second H bridge, the first H bridge comprises two first switches, the second H bridge comprises two second switches, the two first switches and the two second switches form a switch of the single-phase full bridge, each comparator corresponds to one path of the triangular wave generator and is used for comparing the single-phase full bridge modulation wave with the triangular wave output by each path of the triangular wave generator respectively, the output voltage of the virtual capacitor series tuning module is output, the voltage comparison method comprises the step of comparing the triangular wave output by any path of the triangular wave generator with the first triangular wave and the second triangular wave respectively, the first triangular wave is the triangular wave per se output by any path of the triangular wave generator, and the second triangular wave is the triangular wave which is identical to the first triangular wave and has 180-degree phase difference;
When the voltage amplitude of the single-phase full-bridge modulation wave is larger than that of the first triangular wave, controlling the output voltage of the first H bridge to be high level; when the voltage amplitude of the single-phase full-bridge modulation wave is smaller than that of the first triangular wave, controlling the output voltage of the first H bridge to be low, wherein the output voltage of the first H bridge is the voltage between the midpoint of the two first switches connected in series and the midpoint of the two supporting capacitors connected in series;
When the voltage amplitude of the single-phase full-bridge modulation wave is larger than that of the second triangular wave, controlling the output voltage of the second H bridge to be low level; when the voltage amplitude of the single-phase full-bridge modulation wave is smaller than that of the second triangular wave, controlling the output voltage of the second H bridge to be high, wherein the output voltage of the second H bridge is the voltage between the midpoint of the two second switches connected in series and the midpoint of the two supporting capacitors connected in series;
Subtracting the output voltage of the second H bridge from the output voltage of the first H bridge to obtain the output voltage of the single-phase full bridge, multiplying the output voltage of the single-phase full bridge by the transformation ratio of the single-phase coupling transformer, and outputting the output voltage of the virtual capacitor series tuning module.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
(1) The virtual capacitor series tuning device suitable for the low-frequency electromagnetic transmission system is suitable for the low-frequency electromagnetic transmission system, realizes series resonance of the virtual capacitor series tuning device and an equivalent inductance component of a transmitting antenna, and reduces output voltage stress of a sine wave excitation current source.
(2) The virtual capacitor series tuning device is adopted, so that the output voltage waveform of the virtual capacitor series tuning device can be flexibly adjusted according to the information of the working frequency point, working current, transmitting antenna reactance and the like of the low-frequency electromagnetic transmitting system, and the tuning requirement of the virtual series tuning device for flexibly adapting the low-frequency electromagnetic transmitting system under different working frequency points is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a virtual capacitor series tuning device applied to a low-frequency electromagnetic transmitting system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a part of a virtual capacitor series tuning module of a virtual capacitor series tuning device according to an embodiment of the present application;
Fig. 3 is a schematic diagram of a control module of a virtual capacitor series tuning system according to an embodiment of the present application to generate a single-phase full-bridge modulation wave;
fig. 4 is a schematic diagram of a modulation module of a virtual capacitor series tuning system according to an embodiment of the present application;
Fig. 5 is a schematic diagram of a modulation module of a virtual capacitor series tuning system according to an embodiment of the present application outputting an output voltage of the virtual capacitor series tuning module;
FIG. 6 is a schematic diagram showing the working current of a virtual capacitor series tuning device according to an embodiment of the present application Waveform, output voltageWaveform, voltage of equivalent inductance component of transmitting antennaSchematic representation of waveforms;
Fig. 7 is a schematic diagram of an operating current of a virtual capacitor series tuning device according to an embodiment of the present application Voltage superposition of waveform, output voltage and equivalent inductance component of transmitting antennaSchematic representation of the waveform.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The terms first, second, third and the like in the description and in the claims and in the above drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, there is provided a virtual capacitor series tuning device suitable for a low-frequency electromagnetic transmission system, the low-frequency electromagnetic transmission system including a sine wave excitation current source and a transmission antenna, the device including a plurality of virtual capacitor series tuning modules connected in series, the virtual capacitor series tuning modules including a shorting switch, an access switch, a single-phase coupling transformer, a single-phase full bridge and a supporting capacitor; the supporting capacitor is connected with the direct current side of the single-phase full bridge, the alternating current side of the single-phase full bridge is connected with the secondary side of the single-phase coupling transformer, and the primary side of the single-phase coupling transformer is connected in series with the low-frequency electromagnetic emission system through the access switch; the serial tuning module is connected with a short-circuit switch in parallel at the position of the low-frequency electromagnetic emission system, and the access switch and the short-circuit switch are matched to control the virtual capacitor serial tuning module to access and cut out the low-frequency electromagnetic emission system.
The low-frequency electromagnetic emission system can be a solid-state high-power low-frequency electromagnetic emission system. The sine wave excitation current source provides working current of the virtual capacitor series tuning deviceThat is, the operating current of the low-frequency electromagnetic emission system。
The output voltage of the single-phase full bridge is the secondary side voltage of the single-phase coupling transformer, and the output voltage of the virtual capacitor series tuning module is the primary side voltage of the single-phase coupling transformer.
The virtual capacitor series tuning device provided by the embodiment is suitable for a low-frequency electromagnetic transmission system, and realizes series resonance of the virtual capacitor series tuning device and an equivalent inductance component of a transmitting antenna. By adopting the virtual capacitor series tuning device, the output voltage stress of the sine wave excitation current source is reduced, and the maximum power output capability of the sine wave excitation current source is better utilized.
The single-phase full bridge is not limited to a two-level single-phase full bridge, and can be matched with the supporting capacitor to adopt a multi-level single-phase full bridge.
In one embodiment, the single-phase full bridge employs a two-level single-phase full bridge, i.e., comprising two half-bridges (H-bridges): a first H-bridge and a second H-bridge. As shown in fig. 2, the first H-bridge includes two diodes connected in series and two switches S 1 and S 1' (also referred to as two first switches) connected in series, the midpoints of the two diodes being connected to the midpoints of the two switches and being the midpoint (point a) of the first H-bridge; the second H-bridge comprises two diodes connected in series and two switches S 2 and S 2' (also referred to as two second switches) connected in series, the midpoints of the two diodes being connected to the midpoints of the two switches and acting as the midpoint (point b) of the first H-bridge, the two first switches and the two second switches constituting the switches of the single-phase full-bridge. The supporting capacitor comprises two supporting capacitors C d1 and C d2 which are connected in series, the midpoint of the supporting capacitors C d1 and C d2 is o point, the midpoint (point a and point b) of the two switches which are connected in series is connected with the secondary side of the single-phase coupling transformer, and the two diodes which are connected in series are connected in parallel with the two supporting capacitors C d1 and C d2 which are connected in series.
The voltages between the midpoint a of the first H bridge, the midpoint b of the second H bridge and the midpoint o of the supporting capacitor are respectivelyAndPrimary side voltage of single-phase coupling transformer (i.e. output voltage of virtual capacitor series tuning module)Primary currentSecondary side voltage (i.e. output voltage of single-phase full bridge)Secondary side currentThe transformer transformation ratio is k 1, and the output voltage of the virtual capacitor series tuning module。
For the virtual capacitor series tuning device with four modules as shown in fig. 2, the output voltage of the virtual capacitor series tuning device。(=1, 2,3, 4) Is the output voltage of the virtual capacitor series tuning module. Operating current of virtual capacitor series tuning moduleOperating current for virtual capacitor series tuning device。
In one embodiment, a control system of the virtual capacitor series tuning device is also provided, and the system comprises a control module and the virtual capacitor series tuning device. As shown in fig. 3, the control module includes a phase locked loop, a phase delay module, a first voltage controller, a second voltage controller, and a sinusoidal signal generating module. Phase-locked loop for secondary side current of single-phase coupling transformerPerforming phase locking; a phase delay module for outputting the phase-locked loopPerforming pi/2 phase delay, wherein the delayed phase is used as a phase reference; the input of the first voltage controller is the voltage of the supporting capacitorVoltage reference to support capacitorThe output of the first voltage controller is the phase adjustment amount delta theta; the phase adjustment quantity and the phase reference are overlapped to be used as a single-phase full-bridge modulation wave phase theta; the input of the second voltage controller is the effective value of the output voltage of the single-phase full bridgeWith the output voltage effective value reference value of the single-phase full bridgeThe output of the second voltage controller is the modulation ratio m, and the modulation ratio m is used as the modulation ratio of the single-phase full-bridge modulation wave; and the sinusoidal signal generating module is used for generating the single-phase full-bridge modulation wave msin theta of the virtual capacitor series tuning module according to the single-phase full-bridge modulation wave phase theta and the single-phase full-bridge modulation wave modulation ratio m.
In one embodiment, as shown in fig. 4, the control system of the virtual capacitor series tuning device further includes a modulation module, and the modulation module includes a triangular wave generator and a comparator. The sine wave generator in fig. 4 shows the control module, and the output of the sine wave generator is a single-phase full-bridge modulated wave output by the control module.
The number of the triangular wave generators is related to the number n of the virtual capacitor series tuning modules, the total number is 2n, and the triangular wave waveforms output by the triangular wave generators are identical and have phase differences of 360 degrees/2 n. The number of the comparators is the same as the number of the triangular wave generators, each comparator corresponds to one path of the triangular wave generator and is used for comparing the voltage of the single-phase full-bridge modulation wave with the voltage of the triangular wave output by each path of the triangular wave generator respectively and outputting the output voltage of the virtual capacitor series tuning module.
As shown in fig. 4, the 4 virtual capacitor series tuning modules of the virtual capacitor series tuning device adopt carrier phase shift modulation technology, so that the equivalent switching frequency of the virtual capacitor series tuning device is further improved, and the influence of switching frequency harmonic waves on the quality characteristics of output power of the virtual capacitor series tuning device is reduced.
The modulation module adopts unipolar frequency multiplication modulation. Fig. 5 is a schematic diagram of a modulation module of a virtual capacitor series tuning system according to an embodiment of the present application outputting an output voltage of the virtual capacitor series tuning module, as shown in fig. 5, where the output voltage of the virtual capacitor series tuning module is doubled in switching harmonic frequency without increasing the switching frequency.
Specifically, the modulation module adopts unipolar frequency multiplication modulation, and the step of outputting the output voltage of the virtual capacitor series tuning module is as follows:
1) The single-phase full-bridge modulation wave (sine wave in fig. 5 ) Respectively with the first triangular wave (triangular wave indicated by solid line in fig. 5)) Comparing the voltage with a second triangular wave (triangular wave represented by a dotted line in fig. 5), wherein the first triangular wave is the triangular wave per se output by any path of the triangular wave generator, and the second triangular wave is the triangular wave which has the same waveform as the first triangular wave and has 180-degree phase difference;
2) When the voltage amplitude of the single-phase full-bridge modulation wave is larger than that of the first triangular wave, controlling the output voltage of the first H bridge to be high level; when the voltage amplitude of the single-phase full-bridge modulation wave is smaller than that of the first triangular wave, controlling the output voltage of the first H bridge to be low, wherein the output voltage of the first H bridge is the voltage between the midpoint of the two first switches connected in series and the midpoint of the two supporting capacitors connected in series; that is, when ＞When controllingAt a high level when＜When controllingIs low;
3) When the voltage amplitude of the single-phase full-bridge modulation wave is larger than that of the second triangular wave, controlling the output voltage of the second H bridge to be low level; when the voltage amplitude of the single-phase full-bridge modulation wave is smaller than that of the second triangular wave, the output voltage of the second H bridge is controlled to be high, and the output voltage of the second H bridge is the voltage between the midpoint of the two second switches connected in series and the midpoint of the two supporting capacitors connected in series; that is, when ＞When controllingAt a low level when＜When controllingIs at a high level;
4) Subtracting the output voltage of the second H bridge from the output voltage of the first H bridge to obtain the output voltage of the single-phase full bridge; and multiplying the output voltage of the single-phase full bridge by the transformation ratio of the single-phase coupling transformer to output the output voltage of the virtual capacitor series tuning module. That is, the output voltage of the virtual capacitor series tuning module is Where k is a positive integer.
Further, the equivalent capacitance of the virtual capacitance series tuning device is:
，
Wherein, Is the effective value of the working current of the low-frequency electromagnetic emission system,Is the effective value of the output voltage of the virtual capacitor series tuning device,Is the operating frequency of the low frequency electromagnetic transmission system.
Further, the maximum value of the effective value of the output voltage of the virtual capacitor series tuning deviceEffective value of working current of low-frequency electromagnetic emission systemEquivalent inductance component of transmitting antennaIt is decided that the method comprises the steps of,。Is the operating frequency of the low frequency electromagnetic transmission system.
Generally, when the effective value of the output voltage of the virtual capacitor series tuning device reaches a maximum value, the equivalent capacitance of the virtual capacitor series tuning device is:
。
FIG. 6 is a schematic diagram showing the working current of a virtual capacitor series tuning device according to an embodiment of the present application Waveform, output voltageWaveform, voltage of equivalent inductance component of transmitting antennaSchematic representation of the waveform. As can be seen from fig. 6, the operating current of the virtual capacitor series tuning devicePhase advances its output voltagePhase 90 deg. output voltage of virtual capacitor series tuning deviceVoltage of equivalent inductance component of phase and transmitting antennaThe phases are 180 deg. out of phase.
Fig. 7 is a schematic diagram of an operating current of a virtual capacitor series tuning device according to an embodiment of the present applicationVoltage superposition of waveform, output voltage after filtering switch frequency harmonic and equivalent inductance component of transmitting antennaSchematic representation of the waveform. As can be seen from fig. 7, the output voltage of the virtual capacitor series tuning deviceVoltage of equivalent inductance component of phase and transmitting antennaThe sum of the phases is zero, and series resonance is realized.
With reference to fig. 6 and fig. 7, the virtual capacitor series tuning device provided by the embodiment of the application is consistent with the external characteristic of the real high-voltage capacitor group in terms of the external characteristic of the output, and can be used for canceling the inductive component of the impedance of the transmitting antenna to realize the series resonance of the low-frequency electromagnetic transmitting system.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A virtual capacitor series tuning device suitable for a low-frequency electromagnetic emission system, which is characterized by comprising a plurality of virtual capacitor series tuning modules connected in series, wherein each virtual capacitor series tuning module comprises a short-circuit switch, an access switch, a single-phase coupling transformer, a single-phase full bridge and a supporting capacitor;
The supporting capacitor is connected with the direct current side of the single-phase full bridge, the alternating current side of the single-phase full bridge is connected with the secondary side of the single-phase coupling transformer, the two ends of the primary side of the single-phase coupling transformer are respectively connected with the access switches, and the short-circuit switch is connected between the two access switches;
The short-circuit switches of the virtual capacitor series tuning modules which are connected in series are connected between a sine wave excitation current source and a transmitting antenna of the low-frequency electromagnetic transmitting system in series, and the access switch and the short-circuit switch are used for controlling the virtual capacitor series tuning modules to be connected into and disconnected from the low-frequency electromagnetic transmitting system in a matching manner;
In the case that the single-phase full bridge is a two-level single-phase full bridge, the single-phase full bridge includes two H-bridges, each H-bridge includes two diodes connected in series and two switches connected in series, the two diodes connected in series and the two switches connected in series are connected in parallel, and a midpoint of the two diodes and a midpoint of the two switches are connected; the support capacitor comprises two support capacitors connected in series; the midpoint of the two switches connected in series is connected with the secondary side of the single-phase coupling transformer, and two ends of the two supporting capacitors connected in series are connected to two ends of the two diodes connected in series.
2. The apparatus of claim 1, wherein the single-phase full bridge further comprises a multi-level single-phase full bridge.
3. The apparatus of claim 1, wherein the equivalent capacitance of the virtual capacitance series tuning apparatus is:
，
Wherein, For the operating current effective value of the low frequency electromagnetic emission system,For the effective value of the output voltage of the virtual capacitor series tuning device,Is the operating frequency of the low frequency electromagnetic transmission system.
4. A device as claimed in claim 3, characterized in that the maximum value of the effective value of the output voltage of the virtual capacitive series tuning means is determined by the effective value of the operating current of the low-frequency electromagnetic transmission system, the equivalent inductance component of the transmitting antenna of the low-frequency electromagnetic transmission system.
5. The apparatus of claim 4, wherein when the effective value of the output voltage of the virtual capacitive series tuning apparatus reaches a maximum value, the equivalent capacitance of the virtual capacitive series tuning apparatus is:
，
Wherein, Is the equivalent inductive component of the transmitting antenna.
6. The apparatus of claim 1, wherein the virtual capacitive series tuning means has an operating current phase that leads its output voltage phase by 90 °, the output voltage phase of the virtual capacitive series tuning means being 180 ° out of phase with the voltage phase of the equivalent inductive component of the transmitting antenna of the low frequency electromagnetic transmitting system, and the sum of the output voltage phase of the virtual capacitive series tuning means and the voltage phase of the equivalent inductive component of the transmitting antenna is zero.
7. A control system for a virtual capacitive series tuning apparatus comprising a control module and a virtual capacitive series tuning apparatus as claimed in any one of claims 1 to 6, wherein the control module comprises:
The phase-locked loop is used for phase-locking the secondary side current of the single-phase coupling transformer;
the phase delay module is used for carrying out pi/2 phase delay on the output of the phase-locked loop, and the phase obtained by delay is used as a phase reference;
A first voltage controller whose input is a difference between a voltage of the support capacitor and a voltage reference of the support capacitor, and whose output is a phase adjustment amount; the phase adjustment quantity is overlapped with the phase reference to obtain a single-phase full-bridge modulation wave phase;
The second voltage controller is input into a difference value between the effective value of the output voltage of the single-phase full bridge and the reference value of the effective value of the output voltage of the single-phase full bridge, and the output of the second voltage controller is a modulation ratio which is used as a modulation ratio of the single-phase full bridge modulation wave;
And the sinusoidal signal generation module is used for generating the single-phase full-bridge modulation wave of the virtual capacitor series tuning module according to the single-phase full-bridge modulation wave phase and the single-phase full-bridge modulation wave modulation ratio.
8. The system of claim 7, further comprising a modulation module comprising a triangular wave generator and a comparator; the number of the triangular wave generators is 2n, the triangular wave waveforms output by the triangular wave generators are the same, the phase difference is 360 degrees/2 n, and n is the number of the virtual capacitor series tuning modules included in the virtual capacitor series tuning device; the number of the comparators is the same as the number of the triangular wave generators, each comparator corresponds to one path of the triangular wave generator and is used for comparing the single-phase full-bridge modulation wave with the triangular wave output by each path of the triangular wave generator and outputting the output voltage of the virtual capacitor series tuning module.
9. The system of claim 8, wherein the modulation module employs unipolar frequency doubling modulation, the single-phase full bridge includes a first H-bridge and a second H-bridge, the first H-bridge includes two first switches, the second H-bridge includes two second switches, the two first switches and the two second switches form the switches of the single-phase full bridge, each comparator corresponds to one path of the triangular wave generator, and is configured to compare the voltage of the single-phase full bridge modulated wave with the triangular wave output by each path of the triangular wave generator, and output the output voltage of the virtual capacitor series tuning module, and the system includes:
For any triangular wave output by the triangular wave generator, the comparator corresponding to the triangular wave is used for comparing the single-phase full-bridge modulation wave with a first triangular wave and a second triangular wave respectively, wherein the first triangular wave is the triangular wave per se output by any one of the triangular wave generators, and the second triangular wave is the triangular wave which is the same as the first triangular wave and has 180-degree phase difference;
When the voltage amplitude of the single-phase full-bridge modulation wave is larger than that of the first triangular wave, controlling the output voltage of the first H bridge to be high level; when the voltage amplitude of the single-phase full-bridge modulation wave is smaller than that of the first triangular wave, controlling the output voltage of a first H bridge to be low, wherein the output voltage of the first H bridge is the voltage between the midpoint of two first switches connected in series and the midpoint of two supporting capacitors connected in series;
When the voltage amplitude of the single-phase full-bridge modulation wave is larger than that of the second triangular wave, controlling the output voltage of the second H bridge to be low level; when the voltage amplitude of the single-phase full-bridge modulation wave is smaller than that of the second triangular wave, controlling the output voltage of a second H bridge to be high, wherein the output voltage of the second H bridge is the voltage between the midpoint of two second switches connected in series and the midpoint of two supporting capacitors connected in series;
subtracting the output voltage of the second H bridge from the output voltage of the first H bridge to obtain the output voltage of the single-phase full bridge; and multiplying the output voltage of the single-phase full bridge by the transformation ratio of the single-phase coupling transformer to output the output voltage of the virtual capacitor series tuning module.
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| CN117452095A (en) * | 2023-09-28 | 2024-01-26 | 中电普瑞电力工程有限公司 | Power operation test device, control method and system of high-power electronic device |
| CN117791896A (en) * | 2023-12-28 | 2024-03-29 | 东北林业大学 | Primary side control circuit and method for secondary side tuning of WPT (Wireless Power transfer) system |
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| US6211735B1 (en) * | 2000-01-21 | 2001-04-03 | Harris Corporation | RF power amplifier having improved power supply for RF drive circuits |
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| CN117791896A (en) * | 2023-12-28 | 2024-03-29 | 东北林业大学 | Primary side control circuit and method for secondary side tuning of WPT (Wireless Power transfer) system |
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