Wireless charging device and system based on partial power conversion and control method thereof

Abstract

The invention discloses a wireless charging device and system based on partial power conversion and a control method of the wireless charging device and system. The device comprises a transmitting device and a receiving device. The receiving device comprises a first receiving coil, a second receiving coil, a first receiving compensation unit, a second receiving compensation unit, a first rectification unit, a second rectification unit and an isolation voltage regulation unit; the first receiving coil is in coupling input with a first transmitting coil of the transmitting device, and the first receiving coil is sequentially connected with the first receiving compensation unit and the first rectifying unit; the second receiving coil is in coupling input with a second transmitting coil of the transmitting device, and the second receiving coil is sequentially connected with a second receiving compensation unit, a second rectifying unit and an isolation voltage regulating unit; the output end of the first rectification unit is connected with the input end of the battery, and the output end of the isolation voltage regulation unit is connected with the input end of the battery. According to the embodiment of the invention, the charging transmission efficiency is improved, the size of the charging device is reduced, and the charging device can be widely applied to the technical field of wireless charging.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to a wireless charging device and system based on partial power conversion and a control method thereof. Background Art

[0002] With the development of electric vehicles, wireless charging technology for electric vehicles is a current research hotspot. In the existing wireless charging technology for electric vehicles, the high-voltage battery of the vehicle needs to be powered by an isolated DC / DC circuit to supply power to the external system; and because the modulatable output voltage range of the receiving end of the wireless charging device is limited, it is necessary to add an isolated DC / DC circuit to expand the output voltage range to meet the charging requirements of the high-voltage battery, so that the wireless charging device usually includes two isolated DC / DC circuits, one isolated DC / DC circuit is used to expand the output voltage range, and the other isolated DC / DC circuit is used to supply power to the external system. This structure not only reduces the transmission efficiency, but also increases the size of the charging device. Summary of the invention

[0003] In view of this, an object of the embodiments of the present invention is to provide a wireless charging device, system and control method thereof based on partial power conversion, which improves the transmission efficiency of charging and reduces the size of the charging device.

[0004] In a first aspect, an embodiment of the present invention provides a wireless charging receiving device based on partial power conversion, comprising a first receiving coil, a second receiving coil, a first receiving compensation unit, a second receiving compensation unit, a first rectifying unit, a second rectifying unit and an isolated voltage regulating unit; wherein,

[0005] The first receiving coil is coupled to the first transmitting coil of the wireless charging transmitting device based on partial power conversion, and the output end of the first receiving coil is connected to the input end of the first receiving compensation unit; the output end of the first receiving compensation unit is connected to the input end of the first rectifying unit;

[0006] The second receiving coil is coupled to the second transmitting coil of the wireless charging transmitting device, and the output end of the second receiving coil is connected to the input end of the second receiving compensation unit; the output end of the second receiving compensation unit is connected to the input end of the second rectifying unit; the output end of the second rectifying unit is connected to the input end of the isolation voltage regulating unit;

[0007] The output end of the first rectifying unit is connected to the input end of the battery, and the output end of the isolating voltage regulating unit is connected to the input end of the battery.

[0008] Optionally, the receiving device also includes any one or more of a first rectifier filter capacitor, a second rectifier filter capacitor, an isolation voltage regulating filter capacitor or an output filter capacitor; the first rectifier filter capacitor is connected in parallel with the output end of the first rectifier unit; the second rectifier filter capacitor is connected in parallel with the output end of the second rectifier unit; the isolation voltage regulating filter capacitor is connected in parallel with the output end of the isolation voltage regulating unit; and the output filter capacitor is connected in parallel with the output end of the receiving device.

[0009] Optionally, the output end of the second rectifier unit is also connected to the input end of an external system to supply power to the external system; the external system includes an auxiliary system of the automobile.

[0010] Optionally, the isolated voltage regulation unit includes an isolated DC-to-DC voltage regulation circuit, and the isolated DC-to-DC voltage regulation circuit includes a bidirectional multi-resonant inductor-inductor-capacitor type DC / DC converter, or a dual active bridge type DC / DC converter.

[0011] In the second aspect, an embodiment of the present invention further provides a wireless charging transmitting device based on partial power conversion, which is coupled to the receiving device as described above, and includes a high-frequency inverter unit, a transmitting compensation unit, a first transmitting coil and a second transmitting coil; the input end of the high-frequency inverter unit is connected to the charging power supply; the output end of the high-frequency inverter unit is connected to the input end of the transmitting compensation unit; the first output end of the transmitting compensation unit is connected to the input end of the first transmitting coil; the second output end of the transmitting compensation unit is connected to the input end of the second transmitting coil.

[0012] Optionally, the transmitting device further includes an input filter capacitor, which is connected in parallel to the input end of the high-frequency inverter unit.

[0013] Optionally, when the first transmitting coil and the second transmitting coil form a series structure, the structure of the transmitting compensation unit, the first receiving compensation unit or the second receiving compensation unit includes a series / series / series structure or an inductor-capacitor-capacitor / series / series structure; when the first transmitting coil and the second transmitting coil form a parallel structure, the structure of the transmitting compensation unit, the first receiving compensation unit or the second receiving compensation unit includes a series / parallel / parallel structure or an inductor-capacitor / series / series structure.

[0014] Optionally, the high-frequency inverter unit includes a full-bridge inverter circuit, a half-bridge inverter circuit or a push-pull inverter circuit.

[0015] In a third aspect, an embodiment of the present invention further provides a wireless charging system based on partial power conversion, comprising a charging pile, a battery and the receiving device as described above; wherein the charging pile comprises a charging power supply and the transmitting device as described above; the output end of the first transmitting coil is coupled to the input end of the first receiving coil, and the output end of the second transmitting coil is coupled to the input end of the second receiving coil.

[0016] In a fourth aspect, an embodiment of the present invention further provides a control method for a wireless charging system based on partial power conversion, which is applied to the wireless charging system as described above, comprising:

[0017] In the charging mode, the output voltage of the first rectifier unit is controlled to be a first preset voltage; wherein the first preset voltage is greater than the output voltage of the isolation voltage regulator unit, so that the input power of the receiving device is input into the battery through the first rectifier unit according to a first preset ratio, and the input power is input into the battery through the second rectifier unit and the isolation voltage regulator unit according to a second preset ratio; the first preset ratio is greater than the second preset ratio;

[0018] The output voltage of the second rectifying unit is controlled to be a second preset voltage; wherein the second preset voltage is equal to the voltage required by the external system to supply power to the external system.

[0019] The implementation of the embodiment of the present invention includes the following beneficial effects: The embodiment of the present invention provides a wireless charging device, system and control method based on partial power conversion; wherein the wireless charging device based on partial power conversion includes a transmitting device and a receiving device. The wireless charging receiving device based on partial power conversion provided by the embodiment of the present invention is based on the principle of partial power conversion, and the first rectifier unit, the isolation voltage regulator unit and the battery are connected in series to control the output voltage of the first rectifier unit to be greater than the output voltage of the isolation voltage regulator unit, so that most of the power input to the receiving device is input into the battery through the first rectifier unit, and a small part is input into the battery through the second rectifier unit and the isolation voltage regulator unit. It only needs to pass through a first-level isolation voltage regulator unit, thereby improving the transmission efficiency of charging and reducing power loss. The output end of the second rectifier unit is connected to the input end of the external system, so that in the charging mode, the battery and the external system can be powered at the same time; in the charging mode, the isolation voltage regulator unit realizes a wide range adjustment of the output voltage of the receiving device. In the battery-powered mode, the battery supplies power to the external system through the first rectifier unit and the isolation voltage regulator unit, thereby realizing the reuse of the isolation voltage regulator unit by the battery and the external system. In addition, the wireless charging device provided in the embodiment of the present invention only uses a primary isolation voltage regulator unit, which effectively reduces the volume of the wireless charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a wireless charging device based on partial power conversion provided by an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a transmission compensation unit in a wireless charging device based on partial power conversion provided by an embodiment of the present invention;

[0022] Figure 3is a schematic structural diagram of another wireless charging device based on partial power conversion provided by an embodiment of the present invention;

[0023] Figure 4 It is a structural schematic diagram of another transmission compensation unit in a wireless charging device based on partial power conversion provided by an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of a coil structure in a wireless charging device based on partial power conversion provided by an embodiment of the present invention;

[0025] Figure 6 is a structural block diagram of a wireless charging system based on partial power conversion provided by an embodiment of the present invention;

[0026] Figure 7 It is a schematic flow chart of the steps of a control method of a wireless charging system based on partial power conversion provided by an embodiment of the present invention;

[0027] Figure 8 The present invention is a schematic diagram of current flow in a wireless charging device based on partial power conversion provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only provided for the convenience of explanation and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0029] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0030] In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0031] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present invention have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the embodiments of the present invention are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0032] Before further describing the embodiments of the present invention in detail, the nouns and terms involved in the embodiments of the present invention are described. The nouns and terms involved in the embodiments of the present invention are subject to the following interpretations.

[0033] like Figure 1 As shown, the embodiment of the present invention provides a wireless charging receiving device based on partial power conversion, including a first receiving coil L s1 , the second receiving coil L s2 , a first receiving compensation unit, a second receiving compensation unit, a first rectifying unit, a second rectifying unit and an isolation voltage regulating unit; wherein,

[0034] The first receiving coil L s1 A first transmitting coil L of a wireless charging transmitting device based on partial power conversion p1 Coupling input, first receiving coil L s1 The output end of is connected to the input end of the first receiving compensation unit; the output end of the first receiving compensation unit is connected to the input end of the first rectifying unit;

[0035] The second receiving coil L s2 The second transmitting coil L of the wireless charging transmitting device p2 Coupling input, second receiving coil L s2 The output end of the second receiving compensation unit is connected to the input end of the second receiving compensation unit; the output end of the second receiving compensation unit is connected to the input end of the second rectifying unit; the output end of the second rectifying unit is connected to the input end of the isolation voltage regulating unit;

[0036] The output end of the first rectifying unit is connected to the input end of the battery, and the output end of the isolating voltage regulating unit is connected to the input end of the battery.

[0037] Specifically, the first receiving coil L s1 A first transmitting coil L of a wireless charging transmitting device based on partial power conversion p1 coupling, so that the first receiving coil L s1 Due to electromagnetic induction, a first input current is generated; the first input current is from the first receiving coil L s1 The output terminal of the second receiving coil L is output and input into the first receiving compensation unit to obtain a first compensation current with improved transmission power; the first compensation current is output from the output terminal of the first receiving compensation unit and input into the first rectifying unit to obtain a first rectified current; the second receiving coil L s2 The second transmitting coil L of the wireless charging transmitting device based on partial power conversion p2 coupling, so that the second receiving coil L s2 Due to electromagnetic induction, a second input current is generated; the second input current is from the second receiving coil L s2The first rectifier current and the first voltage regulating current are input into the battery together.

[0038] Specifically, the first rectifying unit or the second rectifying unit includes a full-bridge rectifying circuit or a half-bridge rectifying circuit.

[0039] Optionally, the receiving device also includes any one or more of a first rectifier filter capacitor, a second rectifier filter capacitor, an isolation voltage regulating filter capacitor or an output filter capacitor; the first rectifier filter capacitor is connected in parallel with the output end of the first rectifier unit; the second rectifier filter capacitor is connected in parallel with the output end of the second rectifier unit; the isolation voltage regulating filter capacitor is connected in parallel with the output end of the isolation voltage regulating unit; and the output filter capacitor is connected in parallel with the output end of the receiving device.

[0040] Specifically, Figure 1 As shown, the receiving device also includes a first rectifier filter capacitor C oH , the first rectifier filter capacitor C oH The receiving device also includes a second rectifying and filtering capacitor C oL , the second rectifier filter capacitor C oL The receiving device also includes an isolation voltage regulating filter capacitor C DC , isolation voltage regulating filter capacitor C DC The receiving device also includes an output filter capacitor C B , output filter capacitor C B One end of the first rectifier filter capacitor C oH One end of the output filter capacitor C B The other end is connected to the isolation voltage regulating filter capacitor C DC One end of the output filter capacitor C B Connected in parallel with the output terminal of the receiving device.

[0041] Specifically, the first rectifier filter capacitor C oH , the second rectifier filter capacitor C oL , Isolation voltage regulating filter capacitor C DC Or output filter capacitor C B It is used to remove high-frequency noise, fluctuation or interference in the signal output by the first rectifying unit, the second rectifying unit, the isolated voltage regulating unit or the receiving device, so that the output signal in the circuit is more stable.

[0042] Optionally, the output end of the second rectifier unit is also connected to the input end of an external system to supply power to the external system; the external system includes an auxiliary system of the automobile.

[0043] Specifically, the auxiliary system of a car is used to control the operation of the car and realize auxiliary functions; the auxiliary system includes low-voltage auxiliary circuits such as the car's audio, car system or control circuit; auxiliary functions include playing music, running artificial intelligence voice or navigating.

[0044] Optionally, the isolated voltage regulation unit includes an isolated DC-to-DC voltage regulation circuit, and the isolated DC-to-DC voltage regulation circuit includes a bidirectional multi-resonant inductor-inductor-capacitor type DC / DC converter, or a dual active bridge type DC / DC converter.

[0045] Specifically, the isolation voltage regulating unit is used to achieve electrical isolation between the battery and the external system, and to achieve stable voltage output; the isolation voltage regulating unit isolates the input voltage of the isolation voltage regulating unit from the electrical connection of the battery through isolation elements such as an isolation transformer or an optocoupler, thereby achieving electrical isolation and preventing current backflow.

[0046] Specifically, the isolated voltage regulation unit also realizes wide range voltage regulation through modulation methods such as pulse width modulation (PWM), pulse frequency modulation (PFM) or phase shift modulation (PSM).

[0047] Specifically, the isolated DC / DC voltage regulation circuit includes a bidirectional multi-resonant inductor-inductor-capacitor (LLC) type DC / DC (DC / DC) converter, or a dual active bridge (DAB) type DC / DC (DC / DC) converter. The specific converter type is determined according to actual conditions and is not limited in the embodiments of the present invention.

[0048] like Figure 1 As shown, the embodiment of the present invention also provides a wireless charging transmitter based on partial power conversion, the wireless charging transmitter is coupled with the receiving device as described above, and includes a high-frequency inverter unit, a transmission compensation unit, a first transmitting coil L p1 and the second transmitting coil L p2 ; The input end of the high-frequency inverter unit and the charging power supply V in The output end of the high frequency inverter unit is connected to the input end of the transmitting compensation unit; the first output end of the transmitting compensation unit is connected to the first transmitting coil L p1 The second output end of the transmitting compensation unit is connected to the second transmitting coil L p2 The input terminal connection of

[0049] Specifically, from the charging power source V inThe output direct current is input into the high-frequency inverter unit to obtain high-frequency alternating current; the high-frequency alternating current is input into the transmitting compensation unit to obtain a transmitting compensation current with improved transmission power; the transmitting compensation current is input from the first output terminal to the first transmitting coil L p1 In the first receiving coil L s1 Generate mutual inductance; transmit compensation current is input from the second output terminal to the second transmitting coil L p2 In the case of a second receiving coil L s2 Generate mutual induction.

[0050] Optionally, the transmitting device further includes an input filter capacitor, which is connected in parallel to the input end of the high-frequency inverter unit.

[0051] Specifically, the transmitting device also includes an input filter capacitor C in , input filter capacitor C in Connected in parallel with the input end of the high-frequency inverter unit; input filter capacitor C in For removing the charging power supply V in High frequency noise in the output.

[0052] Optionally, when the first transmitting coil and the second transmitting coil form a series structure, the structure of the transmitting compensation unit, the first receiving compensation unit or the second receiving compensation unit includes a series / series / series structure or an inductor-capacitor-capacitor / series / series structure; when the first transmitting coil and the second transmitting coil form a parallel structure, the structure of the transmitting compensation unit, the first receiving compensation unit or the second receiving compensation unit includes a series / parallel / parallel structure or an inductor-capacitor / series / series structure.

[0053] Specifically, the first transmitting coil and the second transmitting coil may form a series structure or a parallel structure. When the first transmitting coil and the second transmitting coil form a series structure, the transmitting compensation currents input into the first transmitting coil and the second transmitting coil are the same; when the first transmitting coil and the second transmitting coil form a parallel structure, the current input into the first transmitting coil is the first transmitting compensation current, and the current input into the second transmitting coil is the second transmitting compensation current. The first transmitting compensation current and the second transmitting compensation current are determined according to the output voltage of the transmitting compensation unit, the divided voltage on the first transmitting coil, and the divided voltage on the second transmitting coil.

[0054] Specifically, when the first transmitting coil and the second transmitting coil form a series structure, the structure of the transmitting compensation unit, the first receiving compensation unit or the second receiving compensation unit includes a series / series / series (S / S / S) structure or an inductor-capacitor-capacitor / series / series (LCC / S / S) structure. The specific compensation unit structure is determined according to actual conditions and is not limited in the embodiment of the present invention.

[0055] Specifically, when the first transmitting coil and the second transmitting coil form a parallel structure, the structure of the transmitting compensation unit, the first receiving compensation unit or the second receiving compensation unit includes a series / parallel / parallel (S / P / P) structure or an inductor-capacitor / series / series (LC / S / S) structure. The specific compensation unit structure is determined according to actual conditions and is not limited in the embodiment of the present invention.

[0056] In a specific embodiment, Figure 2 As shown, the transmitting compensation unit, the first receiving compensation unit and the second receiving compensation unit form an S / S / S structure; the first compensation capacitor C p1 and the first transmitting coil L p1 A first compensation series circuit is formed, and the two ends of the first compensation series circuit are connected to the two output ends of the high-frequency inverter circuit; a second compensation capacitor C p2 and the second transmitting coil L p2 A second compensation series circuit is formed, and the second compensation series circuit is connected to two output ends of the high-frequency inverter circuit; a first receiving compensation capacitor C s1 With the first receiving coil L s1 In series, the second receiving compensation capacitor C s2 With the second receiving coil L s2 Series connection; first transmitting coil L p1 With the first receiving coil L s1 Mutual inductance M 11 , the second transmitting coil L p2 With the second receiving coil L s2 Mutual inductance M 22 ; The first transmitting coil L p1 With the second transmitting coil L p2 There is no coupling relationship between the first receiving coil L s1 With the second receiving coil L s2 There is no coupling relationship between them.

[0057] Optionally, the high-frequency inverter unit includes a full-bridge inverter circuit, a half-bridge inverter circuit or a push-pull inverter circuit.

[0058] Specifically, a full-bridge inverter circuit is a common inverter topology, which usually includes four power switching devices, an output transformer and a corresponding drive circuit. The power switching devices include metal-oxide semiconductor field effect transistors (MOSFETs) or insulated gate bipolar transistors (IGBTs); the full-bridge inverter circuit forms a bridge structure through four power switching devices and an output transformer to convert a DC signal into an AC signal; the full-bridge inverter circuit can output output signals of positive and negative half cycles to generate a signal with a complete AC waveform.

[0059] Specifically, a half-bridge inverter circuit generally includes two power switching devices and a corresponding drive circuit. The power switching devices include MOSFET or IGBT. By alternately controlling the on and off of the two power switching devices, a DC signal is converted into an AC signal. Each power switching device in the half-bridge inverter circuit only needs to bear half of the input voltage of the half-bridge inverter circuit, thereby reducing the power loss of the device.

[0060] Specifically, the push-pull inverter circuit generally includes two complementary power switch devices and a corresponding drive circuit, wherein the complementary power switch devices include transistors or MOSFETs; the push-pull inverter circuit converts a DC signal into an AC signal by alternately controlling the on and off of the two complementary power switch devices. The push-pull inverter circuit uses two complementary power switch devices, so that the input DC signal is effectively utilized, thereby improving the conversion efficiency between the DC signal and the AC signal.

[0061] In a specific embodiment, a wireless charging device based on partial power conversion is Figure 3 As shown, the high-frequency inverter unit 1 includes a first metal-oxide semiconductor field effect transistor (MOSFET) S1, a second MOSFET tube S2, a third MOSFET tube S3 and a fourth MOSFET tube S4; the first MOSFET tube S1 and the second MOSFET tube S2 constitute a first inverter series circuit, and a first inverter node exists between the first MOSFET tube S1 and the second MOSFET tube S2; the third MOSFET tube S3 and the fourth MOSFET tube S4 constitute a second inverter series circuit, and a second inverter node exists between the third MOSFET tube S3 and the fourth MOSFET tube S4; the first inverter series circuit and the second inverter series circuit are connected in parallel; the input filter capacitor C in Connected in parallel with the first inverter series circuit.

[0062] The transmitting compensation unit 2, the first receiving compensation unit 3 and the second receiving compensation unit 4 form an S / S / S structure. The transmitting compensation unit 2 includes a first transmitting compensation capacitor C p1 and the second transmitting compensation capacitor C p2 ; The first transmitting compensation capacitor C p1 One end is connected to the first inverter node, and the other end is connected to the first transmitting coil L p1 One end of the first transmitting coil L p1 The other end of the second transmitting compensation capacitor C is connected to the second inversion node; p2 One end is connected to the first inverter node, and the other end is connected to the second transmitting coil L p2 One end of the second transmitting coil L p2 The other end of the first transmitting coil L is connected to the second inverter node; p1 and the second transmitting coil Lp2 in parallel.

[0063] The first receiving compensation unit 3 includes a first receiving compensation capacitor C s1 The second receiving compensation unit 4 includes a second receiving compensation capacitor C s2 ; The first receiving compensation capacitor C s1 One end of the first receiving coil L s1 One end of the first receiving coil L is connected to the first rectifier unit; the other end is connected to the first rectifier unit; s1 The other end is connected to the first rectifier unit; the second receiving compensation capacitor C s2 One end of the second receiving coil L s2 One end of the second receiving coil L is connected to the other end of the second receiving coil L s2 The other end is connected to the second rectifying unit.

[0064] Specifically, the first transmitting compensation capacitor C p1 With the first receiving compensation capacitor C s1 A dual capacitor-capacitor (SS) compensation structure is formed, and the second transmitting compensation capacitor C p2 With the second receiving compensation capacitor C s2 Constitute a double SS compensation structure.

[0065] Specifically, the first transmitting coil L p1 With the first receiving coil L s1 Mutual inductance M 11 , the second transmitting coil L p2 With the second receiving coil L s2 Mutual inductance M 22 .

[0066] The first rectifying unit 5 is a full-bridge rectifying circuit, including a first diode D1, a second diode D2, a fifth MOSFET tube S 13 and the sixth MOSFET tube S 14 The first diode D1 and the second diode D2 form a first rectifier series circuit, and the fifth MOSFET tube S 13 and the sixth MOSFET tube S 14 The second rectifying series circuit is formed, the first rectifying series circuit and the second rectifying series circuit are connected in parallel; the node between the first diode D1 and the second diode D2 is connected to the first receiving compensation capacitor C s1 The other end of the fifth MOSFET tube S 13 and the sixth MOSFET tube S 14 The node between the second receiving coil L s2 The other end of the first rectifier filter capacitor C oH Connected in parallel with the second rectifying series circuit.

[0067] The second rectifying unit 6 is a full-bridge rectifying circuit, including a third diode D5, a fourth diode D6, a fifth diode D7 and a sixth diode D8; the third diode D5 and the fourth diode D6 constitute a third rectifying series circuit, the fifth diode D7 and the sixth diode D8 constitute a fourth rectifying series circuit, the third rectifying series circuit and the fourth rectifying series circuit are connected in parallel; the node between the third diode D5 and the fourth diode D6 is connected to the second receiving compensation capacitor C s2 The other end of the fifth diode D7 and the sixth diode D8 are connected to the node between the second receiving coil L s2 The other end of the second rectifier filter capacitor C oL In parallel with the fourth rectifier series circuit, the external system 7 is connected to the second rectifier filter capacitor C oL in parallel.

[0068] The isolated voltage regulating unit 8 includes a primary inverter circuit, an LC-LLC (inductor / capacitor-inductor / inductor / capacitor) multi-resonance network, a high-frequency transformer T1 and a full-bridge rectifier circuit. The output end of the primary inverter circuit is connected to the input end of the LC-LLC multi-resonance network, the output end of the LC-LLC multi-resonance network is connected to the input end of the high-frequency transformer T1, and the output end of the high-frequency transformer T1 is connected to the input end of the full-bridge rectifier circuit. Among them, the primary inverter circuit includes a seventh MOSFET tube S5, an eighth MOSFET tube S6, a ninth MOSFET tube S7 and a tenth MOSFET tube S8; the seventh MOSFET tube S5 and the eighth MOSFET tube S6 constitute a first voltage regulating series circuit, the ninth MOSFET tube S7 and the tenth MOSFET tube S8 constitute a second voltage regulating series circuit, and the first voltage regulating series circuit and the second voltage regulating series circuit are connected in parallel. The LC-LLC multi-resonance network includes a first resonant inductor L m2 , the second resonant inductor L s , the third resonant inductor L p , the first resonant capacitor C s and the second resonant capacitor C p ; The third resonant inductor L p and the second resonant capacitor C p A resonant parallel circuit is formed; the first resonant inductor L m2 , the second resonant inductor L s , the first resonant capacitor C s , the resonant parallel circuit and the high-frequency transformer T1 form a series circuit; the first resonant inductor L m2 and the second resonant inductor L s The node between the seventh MOSFET tube S5 and the eighth MOSFET tube S6 is connected, and the first resonant capacitor C sThe node between the 11th MOSFET tube S9 and the 12th MOSFET tube S8 is connected to the node between the 11th MOSFET tube S9 and the 12th MOSFET tube S8. 10 、Thirteenth MOSFET tube S 11 and the fourteenth MOSFET tube S 12 ; The eleventh MOSFET tube S9 and the twelfth MOSFET tube S 10 The fifth rectifier series circuit is formed, and the thirteenth MOSFET tube S 11 and the fourteenth MOSFET tube S 12 The sixth rectifier series circuit is formed, and the fifth rectifier series circuit and the sixth rectifier series circuit form a parallel circuit; the eleventh MOSFET tube S9 and the twelfth MOSFET tube S 10 The node between them is connected to an output terminal of the high frequency transformer T1, and the thirteenth MOSFET tube S 11 and the fourteenth MOSFET tubes 12 The node between is connected to the other output terminal of the high-frequency transformer T1; the second rectifier filter capacitor C oL Connected in parallel with the sixth rectifying series circuit.

[0069] The first rectifier filter capacitor C oH And the second rectifier filter capacitor C oL The filter series circuit is formed, and the output filter capacitor C B In parallel with the filter series circuit, the battery and the output filter capacitor C B in parallel.

[0070] In another specific embodiment, Figure 4 As shown, the transmitting compensation unit, the first receiving compensation unit and the second receiving compensation unit form an LCC / S / S structure; in the transmitting compensation unit, the first compensation inductor L1 and the first compensation capacitor C p , the first transmitting coil L p1 and the second transmitting coil L p2 A third compensation series circuit is formed, and the two ends of the compensation series circuit are connected to the two output ends of the high-frequency inverter circuit; the first compensation capacitor C p , the first transmitting coil L p1 and the second transmitting coil L p2 A fourth compensation series circuit is formed, and the second compensation capacitor C1 is connected in parallel with the fourth compensation series circuit; the first transmitting coil L p1 and the second transmitting coil L p2 By connecting in series, the coupling of the coils on the same side is avoided; the first transmitting coil l p1 With the first receiving coil l s1 Mutual inductance M 11 , the second transmitting coil Lp2 With the second receiving coil L s2 Mutual inductance M 22 .

[0071] In a specific embodiment, Figure 5 As shown, the coil structure in the wireless charging device based on partial power conversion includes a first magnetic material 1, a first transmitting coil 2, a second transmitting coil 3, a first receiving coil 4, a second receiving coil 5, and a second magnetic material 6 in sequence; the first transmitting coil 2 and the first receiving coil 4 are monopole structures; the second transmitting coil 3 and the second receiving coil 5 are bipole structures; in the structure of this specific embodiment, the coupling inductance between the first transmitting coil 2 and the second transmitting coil 3 can be ignored, and the coupling inductance between the first receiving coil 4 and the second receiving coil 5 can be ignored, thereby realizing the decoupling of the coils on the same side.

[0072] Specifically, the first magnetic material or the second magnetic material includes ferrite. The specific material is determined according to actual conditions and is not limited in the embodiments of the present invention. The embodiments are only provided for reference.

[0073] like Figure 6 As shown, an embodiment of the present invention further provides a wireless charging system based on partial power conversion, including a charging pile, a battery and the receiving device as described above; wherein the charging pile includes a charging power supply and the transmitting device as described above; the output end of the first transmitting coil is coupled to the input end of the first receiving coil, and the output end of the second transmitting coil is coupled to the input end of the second receiving coil.

[0074] Specifically, the charging pile is arranged outside the car, and the charging power source of the charging pile can be a power source arranged inside the charging pile or an external power source; the receiving device and the battery are arranged inside the car.

[0075] like Figure 7 As shown, an embodiment of the present invention further provides a control method for a wireless charging system based on partial power conversion, which is applied to the wireless charging system as described above, and includes:

[0076] S100, in the charging mode, controlling the output voltage of the first rectifier unit to be a first preset voltage; wherein the first preset voltage is greater than the output voltage of the isolation voltage regulator unit, so that the input power of the receiving device is input into the battery through the first rectifier unit according to a first preset ratio, and the input power is input into the battery through the second rectifier unit and the isolation voltage regulator unit according to a second preset ratio; the first preset ratio is greater than the second preset ratio;

[0077] S200, controlling the output voltage of the second rectifier unit to be a second preset voltage; wherein the second preset voltage is equal to a voltage required by the external system to supply power to the external system.

[0078] Specifically, specific values ​​of the first preset ratio and the second preset ratio are determined according to actual conditions and are not limited in the embodiment of the present invention.

[0079] Specifically, in the charging mode, the output voltage of the first rectifier unit is controlled to be greater than the output voltage of the isolated voltage regulator unit, so that the power output by the transmitting device is mainly input into the battery through the first rectifier unit, and a small part of the power is input into the battery through the second rectifier unit and the isolated voltage regulator unit; at the same time, the output voltage of the second rectifier unit is controlled to be equal to the voltage required by the external system, so that the system can power the external system while charging the battery.

[0080] Specifically, the method of controlling the output voltage of the first rectifying unit includes: setting the output voltage ratio of the first rectifying unit and the output voltage ratio of the isolation voltage regulating unit by designing circuit parameters.

[0081] Specifically, Figure 8 As shown, when the car is in driving mode, the current is output from the battery and passes through the fifth MOSFET tube S 13 , the sixth MOSFET tube S 14 and isolation voltage regulating unit, and input into the external system for power supply.

[0082] The implementation of the embodiment of the present invention includes the following beneficial effects: The embodiment of the present invention provides a wireless charging device, system and control method based on partial power conversion; wherein the wireless charging device based on partial power conversion includes a transmitting device and a receiving device. The wireless charging receiving device based on partial power conversion provided by the embodiment of the present invention is based on the principle of partial power conversion, and the first rectifier unit, the isolation voltage regulator unit and the battery are connected in series to control the output voltage of the first rectifier unit to be greater than the output voltage of the isolation voltage regulator unit, so that most of the power input to the receiving device is input into the battery through the first rectifier unit, and a small part is input into the battery through the second rectifier unit and the isolation voltage regulator unit. It only needs to pass through a first-level isolation voltage regulator unit, thereby improving the transmission efficiency of charging and reducing power loss. The output end of the second rectifier unit is connected to the input end of the external system, so that in the charging mode, the battery and the external system can be powered at the same time; in the charging mode, the isolation voltage regulator unit realizes a wide range adjustment of the output voltage of the receiving device. In the battery-powered mode, the battery supplies power to the external system through the first rectifier unit and the isolation voltage regulator unit, thereby realizing the reuse of the isolation voltage regulator unit by the battery and the external system. In addition, the wireless charging device provided in the embodiment of the present invention only uses a primary isolation voltage regulator unit, which effectively reduces the volume of the wireless charging device.

[0083] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A wireless charging receiving device based on partial power conversion, characterized in that: It includes a first receiving coil, a second receiving coil, a first receiving compensation unit, a second receiving compensation unit, a first rectifying unit, a second rectifying unit and an isolated voltage regulating unit; wherein, The first receiving coil is coupled to the first transmitting coil of the wireless charging transmitting device based on partial power conversion, the output end of the first receiving coil is connected to the input end of the first receiving compensation unit; the output end of the first receiving compensation unit is connected to the input end of the first rectifying unit; The second receiving coil is coupled to the second transmitting coil of the wireless charging transmitting device, and the output end of the second receiving coil is connected to the input end of the second receiving compensation unit; the output end of the second receiving compensation unit is connected to the input end of the second rectifying unit; the output end of the second rectifying unit is connected to the input end of the isolation voltage regulating unit; The output end of the first rectifying unit is connected to the input end of the battery, and the output end of the isolation voltage regulating unit is connected to the input end of the battery.

2. The wireless charging receiving device based on partial power conversion according to claim 1, characterized in that: The receiving device also includes any one or more of a first rectifier filter capacitor, a second rectifier filter capacitor, an isolation voltage regulating filter capacitor or an output filter capacitor; the first rectifier filter capacitor is connected in parallel with the output end of the first rectifier unit; the second rectifier filter capacitor is connected in parallel with the output end of the second rectifier unit; the isolation voltage regulating filter capacitor is connected in parallel with the output end of the isolation voltage regulating unit; and the output filter capacitor is connected in parallel with the output end of the receiving device.

3. The wireless charging receiving device based on partial power conversion according to claim 1, characterized in that: The output end of the second rectifier unit is also connected to the input end of an external system to supply power to the external system; the external system includes an auxiliary system of the automobile.

4. The wireless charging receiving device based on partial power conversion according to claim 1, characterized in that: The isolated voltage regulation unit comprises an isolated DC-to-DC voltage regulation circuit, and the isolated DC-to-DC voltage regulation circuit comprises a bidirectional multi-resonant inductor-inductor-capacitor type DC / DC converter, or a dual active bridge type DC / DC converter.

5. A wireless charging transmitter based on partial power conversion, characterized in that: The wireless charging transmitting device is coupled with the receiving device according to any one of claims 1 to 4, and includes a high-frequency inverter unit, a transmitting compensation unit, a first transmitting coil and a second transmitting coil; the input end of the high-frequency inverter unit is connected to a charging power source; the output end of the high-frequency inverter unit is connected to the input end of the transmitting compensation unit; the first output end of the transmitting compensation unit is connected to the input end of the first transmitting coil; the second output end of the transmitting compensation unit is connected to the input end of the second transmitting coil.

6. The wireless charging transmitter based on partial power conversion according to claim 5, characterized in that: The transmitting device further includes an input filter capacitor, which is connected in parallel with the input end of the high-frequency inverter unit.

7. The wireless charging transmitter based on partial power conversion according to claim 5, characterized in that: When the first transmitting coil and the second transmitting coil form a series structure, the structure of the transmitting compensation unit, the first receiving compensation unit or the second receiving compensation unit includes a series / series / series structure or an inductor-capacitor-capacitor / series / series structure; when the first transmitting coil and the second transmitting coil form a parallel structure, the structure of the transmitting compensation unit, the first receiving compensation unit or the second receiving compensation unit includes a series / parallel / parallel structure or an inductor-capacitor / series / series structure.

8. The wireless charging transmitter based on partial power conversion according to claim 5, characterized in that: The high frequency inverter unit includes a full-bridge inverter circuit, a half-bridge inverter circuit or a push-pull inverter circuit.

9. A wireless charging system based on partial power conversion, characterized in that: It comprises a charging pile, a battery and a receiving device as described in claims 1-3; wherein the charging pile comprises a charging power supply and a transmitting device as described in claims 5-8; the output end of the first transmitting coil is coupled with the input end of the first receiving coil, and the output end of the second transmitting coil is coupled with the input end of the second receiving coil.

10. A control method for a wireless charging system based on partial power conversion, characterized in that: The wireless charging system as claimed in claim 9 comprises: In the charging mode, the output voltage of the first rectifier unit is controlled to be a first preset voltage; wherein the first preset voltage is greater than the output voltage of the isolation voltage regulator unit, so that the input power of the receiving device is input into the battery through the first rectifier unit at a first preset ratio, and the input power is input into the battery through the second rectifier unit and the isolation voltage regulator unit at a second preset ratio; the first preset ratio is greater than the second preset ratio; The output voltage of the second rectifying unit is controlled to be a second preset voltage; wherein the second preset voltage is equal to the voltage required by the external system to supply power to the external system.

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