CN110797991A - kW-level power wireless electric energy transmission system based on relay converter - Google Patents
kW-level power wireless electric energy transmission system based on relay converter Download PDFInfo
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- CN110797991A CN110797991A CN201910958646.3A CN201910958646A CN110797991A CN 110797991 A CN110797991 A CN 110797991A CN 201910958646 A CN201910958646 A CN 201910958646A CN 110797991 A CN110797991 A CN 110797991A
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- 238000005516 engineering process Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 2
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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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
Abstract
The invention discloses a kW-level power wireless electric energy transmission system based on a relay converter, and belongs to the field of wireless electric energy transmission. The invention comprises the following steps: a transmitting section for transmitting electric energy; a relay converter for transferring electrical energy; a receiving part for receiving power. The components of the invention are all commercial components, and are easy to implement; meanwhile, the transmission distance is long, the power reaches the kW level, frequent plugging and unplugging of electrical connecting pieces can be avoided, and the loss of devices is reduced; and the wires can be prevented from being exposed in the air, so that the reliability is higher.
Description
Technical Field
The invention relates to a kW-level power wireless electric energy transmission system based on a relay converter, and belongs to the field of wireless electric energy transmission.
Background
As an emerging power supply technology, research and application of a wireless power transmission technology are in a rapid development stage, and many problems need to be solved. The wireless power transmission technology is a product of the integration of power electronic technology and information electronic technology, and relates to a plurality of fields of inverter devices, compensation networks, rectifying devices, operation control, fault protection, communication and the like. Because the prior art is a wireless electric energy transmission technology based on a relay coil, the wireless electric energy transmission technology cannot meet the requirement of realizing high-power and high-efficiency operation under long-distance transmission, the invention provides a kW-level power wireless electric energy transmission system based on a relay converter, the high-efficiency operation can be realized under long distance, and the power reaches the kW level.
Disclosure of Invention
The invention provides a kW-level power wireless electric energy transmission system based on a relay converter, so that the system can realize high-power and high-efficiency operation at a long distance.
The technical scheme of the invention is as follows: a relay converter based kW level power wireless power transfer system comprising:
a transmitting section for transmitting electric energy;
a relay converter for transferring electrical energy;
a receiving part for receiving power.
The transmitting part comprises a power supply Udc, a high-frequency inverter circuit consisting of four MOS switches with anti-parallel diodes, a primary side compensation network LCC and a transmitting coil; wherein the positive pole of the direct current power supply Udc is connected with the drains of the MOS switch S1 with anti-parallel diode and the MOS switch S3 with anti-parallel diode, the negative pole of the direct current power supply Udc is connected with the sources of the MOS switch S2 with anti-parallel diode and the MOS switch S4 with anti-parallel diode, the source of the MOS switch S1 with anti-parallel diode, the drain electrode of the MOS switch S2 with the anti-parallel diode is connected in series and then connected with one end of the inductor in the primary side compensation network LCC, the output end of the inductor in the primary side compensation network LCC is connected with one end of the first capacitor and one end of the second capacitor in the primary side compensation network LCC, the other end of the first capacitor in the primary side compensation network LCC is connected with the connecting line of the source electrode of the MOS switch S3 with the anti-parallel diode and the drain electrode of the MOS switch S4 with the anti-parallel diode in series and the other end of the transmitting coil, and the other end of the second capacitor in the primary side compensation network LCC is connected with one end of.
The relay converter comprises a relay receiving coil, a series resonance compensation capacitor I, a rectifying circuit I consisting of four diodes, a filter capacitor I, a load I, an LC filter circuit I, an inverter circuit consisting of four MOS switches with anti-parallel diodes, a resonance compensation network LCC and a relay transmitting coil; wherein one end of a series resonance compensation capacitor I is connected with one end of a relay receiving coil in series, the other end of the relay receiving coil is connected with a connecting line of the anode of a diode D3 and the cathode of a diode D4 in series, the other end of the series resonance compensation capacitor I is connected with a connecting line of the anode of a diode D1 and the cathode of a diode D2 in series, the cathode of a diode D1, the cathode of a diode D3, one end of a filter capacitor I and one end of a load I are connected with one end of an inductor in an LC filter circuit I, the other end of the inductor in the LC filter circuit I is connected with one end of a capacitor in the LC filter circuit I, the drain of a MOS switch S5 with an anti-parallel diode and the drain of a MOS switch S7 with an anti-parallel diode, the anode of a diode D2 is connected with the anode of a diode D4, the other end of the filter capacitor I, the other end of the load I, the other end, the source of the MOS switch S5 with the anti-parallel diode is connected with the drain of the MOS switch S6 with the anti-parallel diode in series through a connecting line to one end of an inductor in the resonance compensation network LCC, the output end of the inductor in the resonance compensation network LCC is connected with one end of a first capacitor and one end of a second capacitor in the resonance compensation network LCC, the other end of the first capacitor in the resonance compensation network LCC is connected with a connecting line between the source of the MOS switch S7 with the anti-parallel diode and the drain of the MOS switch S8 with the anti-parallel diode in series and the other end of the relay transmitting coil, and the other end of the second capacitor in the resonance compensation network LCC is connected with one end of the relay transmitting coil.
The receiving part comprises a receiving coil, a series resonance compensation capacitor II, a rectifying circuit II consisting of four diodes, a filter capacitor II, an LC filter circuit II and a load II; one end of the receiving coil is connected with one end of the series resonance compensation capacitor II, the other end of the receiving coil is connected with the anode of the diode D7 and the cathode of the diode D8, the other end of the series resonance compensation capacitor II is connected with the anode of the diode D5 and the cathode of the diode D6, the cathode of the diode D5, the cathode of the diode D7 and one end of the filter capacitor II are connected with one end of an inductor in the LC filter circuit II, the other end of the inductor in the LC filter circuit II is connected with one end of a capacitor in the LC filter circuit II and one end of a load II, and the anode of the diode D6 is connected with the anode of the diode D8, the other end of the filter capacitor II, the other end of the capacitor in the.
The relay converters are 1 or more.
The first capacitor in the primary compensation network LCC is 132n and the second capacitor is 46.1 n.
The first capacitance in the resonant compensation network LCC is 132n and the second capacitance is 46.1 n.
The invention has the beneficial effects that: the components of the invention are all commercial components, and are easy to implement; meanwhile, the transmission distance is long, the power reaches the kW level, frequent plugging and unplugging of electrical connecting pieces can be avoided, and the loss of devices is reduced; and the wires can be prevented from being exposed in the air, so that the reliability is higher.
Drawings
FIG. 1 is a block diagram of the system architecture of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
Example 1: as shown in fig. 1-2, a relay converter based kW-level power wireless power transmission system includes: a transmitting section for transmitting electric energy; a relay converter for transferring electrical energy; a receiving part for receiving power.
Furthermore, the transmitting part can be arranged to comprise a power supply Udc, a high-frequency inverter circuit consisting of four MOS switches with anti-parallel diodes, a primary side compensation network LCC and a transmitting coil; wherein the positive pole of the direct current power supply Udc is connected with the drains of the MOS switch S1 with anti-parallel diode and the MOS switch S3 with anti-parallel diode, the negative pole of the direct current power supply Udc is connected with the sources of the MOS switch S2 with anti-parallel diode and the MOS switch S4 with anti-parallel diode, the source of the MOS switch S1 with anti-parallel diode, the drain electrode of the MOS switch S2 with the anti-parallel diode is connected in series and then connected with one end of the inductor in the primary side compensation network LCC, the output end of the inductor in the primary side compensation network LCC is connected with one end of the first capacitor and one end of the second capacitor in the primary side compensation network LCC, the other end of the first capacitor in the primary side compensation network LCC is connected with the connecting line of the source electrode of the MOS switch S3 with the anti-parallel diode and the drain electrode of the MOS switch S4 with the anti-parallel diode in series and the other end of the transmitting coil, and the other end of the second capacitor in the primary side compensation network LCC is connected with one end of.
Furthermore, the relay converter can be arranged to comprise a relay receiving coil, a series resonance compensation capacitor I, a rectification circuit I consisting of four diodes, a filter capacitor I, a load I, an LC filter circuit I, an inverter circuit consisting of four MOS switches with anti-parallel diodes, a resonance compensation network LCC and a relay transmitting coil; wherein one end of a series resonance compensation capacitor I is connected with one end of a relay receiving coil in series, the other end of the relay receiving coil is connected with a connecting line of the anode of a diode D3 and the cathode of a diode D4 in series, the other end of the series resonance compensation capacitor I is connected with a connecting line of the anode of a diode D1 and the cathode of a diode D2 in series, the cathode of a diode D1, the cathode of a diode D3, one end of a filter capacitor I and one end of a load I are connected with one end of an inductor in an LC filter circuit I, the other end of the inductor in the LC filter circuit I is connected with one end of a capacitor in the LC filter circuit I, the drain of a MOS switch S5 with an anti-parallel diode and the drain of a MOS switch S7 with an anti-parallel diode, the anode of a diode D2 is connected with the anode of a diode D4, the other end of the filter capacitor I, the other end of the load I, the other end, the source of the MOS switch S5 with the anti-parallel diode is connected with the drain of the MOS switch S6 with the anti-parallel diode in series through a connecting line to one end of an inductor in the resonance compensation network LCC, the output end of the inductor in the resonance compensation network LCC is connected with one end of a first capacitor and one end of a second capacitor in the resonance compensation network LCC, the other end of the first capacitor in the resonance compensation network LCC is connected with a connecting line between the source of the MOS switch S7 with the anti-parallel diode and the drain of the MOS switch S8 with the anti-parallel diode in series and the other end of the relay transmitting coil, and the other end of the second capacitor in the resonance compensation network LCC is connected with one end of the relay transmitting coil.
Further, the receiving part can be arranged to comprise a receiving coil, a series resonance compensation capacitor II, a rectifying circuit II consisting of four diodes, a filter capacitor II, an LC filter circuit II and a load II; one end of the receiving coil is connected with one end of the series resonance compensation capacitor II, the other end of the receiving coil is connected with the anode of the diode D7 and the cathode of the diode D8, the other end of the series resonance compensation capacitor II is connected with the anode of the diode D5 and the cathode of the diode D6, the cathode of the diode D5, the cathode of the diode D7 and one end of the filter capacitor II are connected with one end of an inductor in the LC filter circuit II, the other end of the inductor in the LC filter circuit II is connected with one end of a capacitor in the LC filter circuit II and one end of a load II, and the anode of the diode D6 is connected with the anode of the diode D8, the other end of the filter capacitor II, the other end of the capacitor in the.
Further, the relay converter may be provided in 1 or more.
Further, the first capacitor in the primary compensation network LCC may be set to 132n and the second capacitor may be set to 46.1 n.
Further, a first capacitance of 132n and a second capacitance of 46.1n may be provided in the resonant compensation network LCC.
Further, the example shown in fig. 2 is used as an example, and as shown in fig. 2, a five-stage relay converter is used for illustration in order to adapt to a wireless power transmission circuit of the present invention; the system comprises a transmitting part, five relay converters and a receiving part. The resonance frequency of the circuit is 85kHz, each magnetic coupler consists of a transmitting coil, a relay receiving coil, a relay transmitting coil and a receiving coil, and the coupling coefficients are all 0.4. The coupling coefficient without relay converter is 0.03.
Wherein, the coupling coefficient is calculated by using a method of connecting two mutual inductance coupling coils in series, LIs justIs an equivalent inductance L after two coils are connected in series in the forward directionInverse directionThe two coils are respectively connected in series in the forward direction and the reverse direction, and the equivalent inductance is obtained by the following formulas (1) to (4):
Lis just＝L1+L2+2M (1)
LInverse direction＝L1+L2-2M (2)
The relay converter comprises a relay receiving coil, a series resonance compensation capacitor I, a rectifying circuit I consisting of four diodes, a filter capacitor I, a load I, an LC filter circuit I, an inverter circuit consisting of four MOS switches with anti-parallel diodes, a resonance compensation network LCC and a relay transmitting coil; the series resonance compensation capacitor is connected with the relay receiving coil in series, at the resonance frequency of 85kHz, the circuit generates series resonance, the capacitive reactance and the inductive reactance are mutually offset, the whole circuit has pure resistance characteristics, and the system flows through the maximum current to reduce the loss. The rectifying circuits D1-D4 convert the alternating current containing the harmonic into direct current, and the filter capacitor has the function of voltage stabilization and supplies power to the load circuit. The inductor in the LC filter circuit prevents a plurality of interference signals accompanied in the direct current from being absorbed and changed into magnetic induction and heat energy, most of the rest interference signals are bypassed to the ground by the capacitor to play a role of inhibiting the interference signals, and the pure direct current is input into the inverter circuit. The direct current generates 85kHz high-frequency alternating current through the inverter, the alternating current is used for inducing a changing magnetic field, the LCC resonance compensation network can utilize leakage inductance and distributed capacitance as distributed elements, the size of the converter is reduced, soft switching of MOS devices S5-S8 is achieved, and switching loss is reduced. Finally, alternating current of 85kHz is transmitted through the transmitting coil.
Combining the coupling coil knowledge and the relation of the LCC-S resonance topology, the method comprises the following steps:
wherein: u shapeABIs the output voltage of the inverter (e.g. in the set of relation between the transmitting part and the relay converter, the output voltage of the inverter of the transmitting part is taken as UAB)，UabIs the input voltage of the rectifying circuit (e.g. in the relation of the transmitting part and the relay converter, the input voltage of the rectifying circuit of the relay converter is taken as Uab) M is the mutual inductance of the coupler, Lf1And Cf1Is the inductance and the first capacitance in the resonant relationship of LCC, ω represents the resonant angular frequency, L1And L2For transmitting and receiving coils in a resonant relationship, C1Is the second capacitance, C, in the LCC2The capacitance is compensated for series resonance in the LCC.
So that: the parameters of each device can be found as shown in fig. 2.
Direct current of the transmitting partPower supply UdcFor 800V as system input, the switching device of the inverter circuit selects the MOSFET to accommodate the 85kHz high frequency circuit. The transmitting coil was 102.3 muh.
In the receiving section, the receive coil was 42.7 muh and the series resonant capacitance was 82.1 nF. The ultrafast recovery diode is selected as a switching device of the rectifying circuit so as to adapt to the working condition with high working frequency.
When the transmission distance is 600mm, no relay converter and 5 relay converters are respectively simulated in the LT-spice, and the following results are obtained:
without the relay converter, the input power is 1.23kW, the output power is 0.594kW, and the efficiency is 48.3%. It can be seen that the system transmission efficiency and transmission power are low.
When 5 relay converters are arranged, the input power of the system is 44.694kW, the output power is 36.202kW, and the efficiency is as high as 81%.
Finally, LT-spice simulation analysis of the circuit shows that the wireless power transmission system based on the relay converter has high transmission efficiency, and kW-level high-power and high-efficiency operation is realized at medium and long distances.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. A kW-level power wireless power transmission system based on a relay converter is characterized in that: the method comprises the following steps:
a transmitting section for transmitting electric energy;
a relay converter for transferring electrical energy;
a receiving part for receiving power.
2. The relay converter based kW level power wireless power transfer system of claim 1, wherein: the transmitting part comprises a power supply Udc, a high-frequency inverter circuit consisting of four MOS switches with anti-parallel diodes, a primary side compensation network LCC and a transmitting coil; wherein the positive pole of the direct current power supply Udc is connected with the drains of the MOS switch S1 with anti-parallel diode and the MOS switch S3 with anti-parallel diode, the negative pole of the direct current power supply Udc is connected with the sources of the MOS switch S2 with anti-parallel diode and the MOS switch S4 with anti-parallel diode, the source of the MOS switch S1 with anti-parallel diode, the drain electrode of the MOS switch S2 with the anti-parallel diode is connected in series and then connected with one end of the inductor in the primary side compensation network LCC, the output end of the inductor in the primary side compensation network LCC is connected with one end of the first capacitor and one end of the second capacitor in the primary side compensation network LCC, the other end of the first capacitor in the primary side compensation network LCC is connected with the connecting line of the source electrode of the MOS switch S3 with the anti-parallel diode and the drain electrode of the MOS switch S4 with the anti-parallel diode in series and the other end of the transmitting coil, and the other end of the second capacitor in the primary side compensation network LCC is connected with one end of.
3. The relay converter based kW level power wireless power transfer system of claim 1, wherein: the relay converter comprises a relay receiving coil, a series resonance compensation capacitor I, a rectifying circuit I consisting of four diodes, a filter capacitor I, a load I, an LC filter circuit I, an inverter circuit consisting of four MOS switches with anti-parallel diodes, a resonance compensation network LCC and a relay transmitting coil; wherein one end of a series resonance compensation capacitor I is connected with one end of a relay receiving coil in series, the other end of the relay receiving coil is connected with a connecting line of the anode of a diode D3 and the cathode of a diode D4 in series, the other end of the series resonance compensation capacitor I is connected with a connecting line of the anode of a diode D1 and the cathode of a diode D2 in series, the cathode of a diode D1, the cathode of a diode D3, one end of a filter capacitor I and one end of a load I are connected with one end of an inductor in an LC filter circuit I, the other end of the inductor in the LC filter circuit I is connected with one end of a capacitor in the LC filter circuit I, the drain of a MOS switch S5 with an anti-parallel diode and the drain of a MOS switch S7 with an anti-parallel diode, the anode of a diode D2 is connected with the anode of a diode D4, the other end of the filter capacitor I, the other end of the load I, the other end, the source of the MOS switch S5 with the anti-parallel diode is connected with the drain of the MOS switch S6 with the anti-parallel diode in series through a connecting line to one end of an inductor in the resonance compensation network LCC, the output end of the inductor in the resonance compensation network LCC is connected with one end of a first capacitor and one end of a second capacitor in the resonance compensation network LCC, the other end of the first capacitor in the resonance compensation network LCC is connected with a connecting line between the source of the MOS switch S7 with the anti-parallel diode and the drain of the MOS switch S8 with the anti-parallel diode in series and the other end of the relay transmitting coil, and the other end of the second capacitor in the resonance compensation network LCC is connected with one end of the relay transmitting coil.
4. The relay converter based kW level power wireless power transfer system of claim 1, wherein: the receiving part comprises a receiving coil, a series resonance compensation capacitor II, a rectifying circuit II consisting of four diodes, a filter capacitor II, an LC filter circuit II and a load II; one end of the receiving coil is connected with one end of the series resonance compensation capacitor II, the other end of the receiving coil is connected with the anode of the diode D7 and the cathode of the diode D8, the other end of the series resonance compensation capacitor II is connected with the anode of the diode D5 and the cathode of the diode D6, the cathode of the diode D5, the cathode of the diode D7 and one end of the filter capacitor II are connected with one end of an inductor in the LC filter circuit II, the other end of the inductor in the LC filter circuit II is connected with one end of a capacitor in the LC filter circuit II and one end of a load II, and the anode of the diode D6 is connected with the anode of the diode D8, the other end of the filter capacitor II, the other end of the capacitor in the.
5. The relay converter based kW level power wireless power transfer system of claim 1, wherein: the relay converters are 1 or more.
6. The relay converter based kW level power wireless power transfer system of claim 2, wherein: the first capacitor in the primary compensation network LCC is 132n and the second capacitor is 46.1 n.
7. The relay converter based kW level power wireless power transmission system of claim 3, wherein: the first capacitance in the resonant compensation network LCC is 132n and the second capacitance is 46.1 n.
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| CN201910958646.3A CN110797991A (en) | 2019-10-10 | 2019-10-10 | kW-level power wireless electric energy transmission system based on relay converter |
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| CN112260418A (en) * | 2020-10-14 | 2021-01-22 | 佛山科学技术学院 | Magnetic suspension wireless charger and charging system |
| CN112583308A (en) * | 2020-11-30 | 2021-03-30 | 哈尔滨工业大学 | Synchronous motor brushless excitation system based on wireless power transmission |
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