Resonant induction wireless power transmission converter with power factor correction

Abstract

The invention discloses a resonance induction wireless power transmission converter with a power factor correction function, and belongs to the technical field of wireless power supply. According to the converter, a single-stage integrated framework is adopted, an interlaced power factor correction sub-stage and a resonant induction type wireless power transmission sub-stage are deeply fused, and an intermediate DC-DC conversion stage of a traditional multi-stage framework is omitted; the resonant induction WPT sublevel realizes non-contact energy transmission through the transmitting coil, the receiving coil and the mutual inductor, and power switch tubes of the full-bridge inverter all realize zero-voltage switching, so that the switching loss is reduced; and the output side provides stable direct current through the full-bridge rectification and filtering module. The device is compact in size, high in efficiency and suitable for medium-low-power wireless power supply scenes such as consumer electronics and biomedical implants.

Description

Technical Field

[0001] This invention belongs to the field of power electronics, specifically relating to a resonant induction wireless power transfer converter with power factor correction. Background Technology

[0002] Wireless power transfer (WPT) technology, through contactless energy transfer, overcomes the limitations of traditional wired power supply in terms of maintenance costs, environmental adaptability (humid, dusty, and vibration environments), and integration of rotating / compact components, and has become one of the core research directions in the field of power electronics. Currently, WPT technology is mainly divided into two categories: inductive power transfer (IPT) and capacitive power transfer (CPT). IPT technology, based on the principle of resonant magnetic coupling, has the advantages of high energy transfer efficiency (efficiency can reach over 85% in medium-to-high power scenarios), strong ability to penetrate non-metallic barriers, and high tolerance for lateral misalignment. It is the mainstream solution for kilowatt-level and below power applications. Its typical compensation topologies include series-series (SS) and LCC, and its operating frequency band is mostly concentrated in the range of 85kHz to 150kHz, which can balance transmission efficiency, electromagnetic compatibility (EMC), and component stress. CPT technology, based on the principle of electric field coupling, although possessing inherent DC isolation characteristics and weak sensitivity to specific metallic environments, is limited by the breakdown strength of capacitor plates, plate area, and the difficulty of achieving high-efficiency operation at the kilowatt level, and is only suitable for low-power scenarios in the milliwatt to watt range.

[0003] Existing IPT systems generally adopt a multi-stage architecture for AC-DC conversion, with a typical structure of "AC-DC active PFC stage → DC-AC high-frequency inverter stage → AC-DC rectifier stage": the front-end PFC is used to improve the input power factor (PF) and reduce the input current harmonic distortion (THD) to meet grid compatibility requirements; the intermediate inverter stage is used to drive the transmitting coil to generate a high-frequency alternating magnetic field; and the rear-end rectifier stage is used to convert the AC current induced by the receiving coil into DC current for the load. However, this multi-stage architecture has significant drawbacks: each stage of conversion has conduction and switching losses, and the series connection of multiple stages leads to a decrease in overall system efficiency, especially in high-frequency (>100kHz) scenarios, where the proportion of switching losses increases significantly; the size is larger, requiring additional energy storage components (inductors, capacitors) and independent control circuits for intermediate DC-DC conversion stages, increasing the number of components compared to a single-stage architecture, resulting in larger system size and higher costs, making it difficult to meet the compact requirements of consumer electronics and implantable devices; the EMI risk is high, as the electromagnetic interference generated by the switching actions of multiple stages is superimposed, requiring additional filtering components (such as large-capacity common-mode inductors and filter capacitors), further worsening the balance between size and cost.

[0004] To address the shortcomings of multi-stage architectures, researchers proposed a single-stage IPT converter solution that integrates PFC and high-frequency inverter functions into the same power stage. However, existing single-stage solutions still suffer from key technical bottlenecks: most single-stage solutions use a single-phase PFC topology, resulting in large input current ripple and requiring additional large-capacity filter inductors, thus negating the size advantage of the single-stage architecture; power switches mostly operate in hard-switching mode, leading to high switching losses and significantly lower efficiency than soft-switching solutions in high-frequency scenarios; the compensation network design is simple, but its adaptability to transmission distance and load changes is poor, resulting in insufficient power transmission stability and output voltage ripple that is difficult to meet the requirements of sensitive loads (such as biomedical equipment).

[0005] Therefore, developing a single-stage IPT converter that combines high power factor, low current ripple, soft-switching characteristics, and compact structure is key to overcoming existing technological limitations and meeting the wireless power supply needs of consumer electronics, biomedicine, and other fields. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a resonant inductive wireless power transfer converter with power factor correction, comprising an input differential mode filter module, an interleaved power factor correction sub-stage, a resonant inductive WPT sub-stage, and an output rectifier filter module.

[0007] The input differential mode filter module includes a differential mode filter inductor, a differential mode filter capacitor, a first full-bridge rectifier circuit, a first diode, and a second diode. The first full-bridge rectifier circuit includes four input rectifier diodes. One end of the differential mode filter inductor is connected to the positive terminal of the AC input voltage, and the other end is connected to the first input terminal of the first full-bridge rectifier circuit. One end of the differential mode filter capacitor is connected to the first input terminal of the first full-bridge rectifier circuit, and the other end is connected to the negative terminal of the AC input voltage. The negative terminal of the AC input voltage is connected to the second input terminal of the first full-bridge rectifier circuit. The anode of the first diode is connected to the positive DC output terminal of the first full-bridge rectifier circuit, and the cathode of the first diode is connected to the first input boost inductor of the interleaved power factor correction sub-stage. The anode of the second diode is connected to the positive DC output terminal of the first full-bridge rectifier circuit, and the cathode of the first diode is connected to the second input boost inductor of the interleaved power factor correction sub-stage. The DC ground output terminal of the first full-bridge rectifier circuit is connected to the negative output terminal of the full-bridge inverter.

[0008] The interleaved power factor correction sub-stage includes a first input boost inductor, a second input boost inductor, a full-bridge inverter, and a DC bus capacitor. One end of the first input boost inductor is connected to the cathode of the first diode of the input differential filter module, and the other end is connected to the first input terminal of the full-bridge inverter. One end of the second input boost inductor is connected to the cathode of the second diode of the input differential filter module, and the other end is connected to the second input terminal of the full-bridge inverter. The DC bus capacitor is connected in parallel between the positive and negative output terminals of the full-bridge inverter.

[0009] The resonant inductive WPT sub-stage includes a primary series compensation network, a transmitting coil, a receiving coil, and a secondary series compensation network. One end of the primary compensation network is connected to the positive output terminal of the full-bridge inverter, and the other end is connected to one end of the transmitting coil. The other end of the transmitting coil is connected to the negative output terminal of the full-bridge inverter, forming a primary resonant circuit. One end of the secondary series compensation network is connected to one end of the receiving coil, and the other end is connected to the first input terminal of the second full-bridge rectifier circuit in the output rectifier and filter module. The other end of the receiving coil is connected to the second input terminal of the second full-bridge rectifier circuit in the output rectifier and filter module, forming a secondary resonant circuit. There is mutual inductance between the transmitting coil and the receiving coil.

[0010] The output rectifier and filter module includes a second full-bridge rectifier circuit and an output filter capacitor; the output filter capacitor is connected in parallel between the positive and negative output terminals of the second full-bridge rectifier circuit.

[0011] Furthermore, the first full-bridge rectifier circuit includes four input rectifier diodes, namely a first input rectifier diode, a second input rectifier diode, a third input rectifier diode, and a fourth input rectifier diode;

[0012] The first input terminal of the first full-bridge rectifier circuit is a common node connecting the anode of the first input rectifier diode and the cathode of the second input rectifier diode; the second input terminal of the first full-bridge rectifier circuit is a common node connecting the anode of the third input rectifier diode and the cathode of the fourth input rectifier diode; the positive DC output terminal of the first full-bridge rectifier circuit is a common node connecting the cathodes of the first input rectifier diode and the cathodes of the third input rectifier diode; and the ground DC output terminal of the first full-bridge rectifier circuit is a common node connecting the anodes of the second input rectifier diode and the anode of the fourth input rectifier diode.

[0013] Furthermore, the full-bridge inverter includes four power switching transistors, namely a first power switching transistor, a second power switching transistor, a third power switching transistor, and a fourth power switching transistor, with each power switching transistor connected in parallel with a parasitic capacitor;

[0014] The first input terminal of the full-bridge inverter is a common node connecting the source of the first power switch and the drain of the second power switch; the second input terminal of the full-bridge inverter is a common node connecting the source of the third power switch and the drain of the fourth power switch; the positive output terminal of the full-bridge inverter is a common node connecting the drain of the first power switch and the drain of the third power switch; and the negative output terminal of the full-bridge inverter is a common node connecting the source of the second power switch and the source of the fourth power switch.

[0015] Furthermore, in the resonant inductive WPT sub-stage, the primary series compensation network is a primary compensation capacitor, and the secondary series compensation network is a secondary compensation capacitor.

[0016] Furthermore, the second full-bridge rectifier circuit includes four rectifier diodes, namely a first output rectifier diode, a second output rectifier diode, a third output rectifier diode, and a fourth output rectifier diode;

[0017] The first input terminal of the second full-bridge rectifier circuit is the common node of the anode of the first output rectifier diode and the cathode of the second output rectifier diode; the second input terminal of the second full-bridge rectifier circuit is the common node of the anode of the third output rectifier diode and the cathode of the fourth output rectifier diode; the positive output terminal of the second full-bridge rectifier circuit is the common node of the cathode of the first output rectifier diode and the cathode of the third output rectifier diode; the negative output terminal of the second full-bridge rectifier circuit is the common node of the anode of the second output rectifier diode and the anode of the fourth output rectifier diode.

[0018] Furthermore, the resonant frequency of the primary resonant circuit and the resonant frequency of the secondary resonant circuit of the resonant inductive WPT sub-stage are both consistent with the switching frequency of the full-bridge inverter.

[0019] Furthermore, the full-bridge inverter adopts a complementary control strategy, with the first and second power switches conducting in a complementary manner, and the third and fourth power switches conducting in a complementary manner. The conduction timing of the first and third power switches is staggered by 180°, which is synchronized with the staggered current timing of the first and second input boost inductors.

[0020] The beneficial effects of adopting the above technical solution are as follows: The resonant induction wireless power transfer converter with power factor correction provided by the present invention adopts a single-stage integrated architecture, which is compact in size and eliminates the intermediate DC-DC conversion stage of the traditional multi-stage architecture, reducing the number of power components and shrinking the system size, which can meet the installation requirements of compact scenarios such as consumer electronics and biomedical implants; the interleaved PFC substage of the present invention makes the input power factor PF close to 1 and the input current THD < 5%, eliminating the need for additional large-capacity filter inductors, and taking into account grid compatibility and size advantages; all power switches of the full-bridge inverter achieve ZVS turn-on, and the switching loss is significantly reduced compared with the hard switching mode, and the system efficiency at full load is significantly higher than that of the traditional multi-stage IPT converter. Attached Figure Description

[0021] Figure 1 A schematic diagram of the single-stage inductive power transfer converter structure provided in Embodiment 1 of the present invention;

[0022] Figure 2A structural diagram of a resonant inductive wireless power transfer converter with power factor correction provided in Embodiment 1 of the present invention;

[0023] Figure 3 The commutation analysis diagram of the resonant inductive wireless power transfer converter with power factor correction when operating in mode 1 is provided in Embodiment 1 of the present invention;

[0024] Figure 4 The commutation analysis diagram of the resonant inductive wireless power transfer converter with power factor correction when operating in mode 2 is provided in Embodiment 1 of the present invention;

[0025] Figure 5 The main waveform diagram of the resonant inductive wireless power transfer converter with power factor correction provided in Embodiment 1 of the present invention. Detailed Implementation

[0026] The specific implementation methods of this application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1:

[0028] A resonant inductive wireless power transfer converter with power factor correction employs a single-stage integrated architecture to construct a single-stage inductive power transfer (IPT) converter that combines high power factor, low current ripple, soft-switching characteristics, and a compact structure. Figure 1 As shown, it simultaneously achieves power factor correction of AC input voltage, wireless power transfer, and stable DC output.

[0029] The resonant inductive wireless power transfer converter structure with power factor correction provided in this embodiment is as follows: Figure 2 As shown, it includes an input differential mode filter module, an interleaved power factor correction sub-stage, a resonant inductive WPT sub-stage, and an output rectifier filter module;

[0030] The input differential mode filter module includes a differential mode filter inductor. Differential mode filter capacitor The first full-bridge rectifier circuit includes four input rectifier diodes: a first full-bridge rectifier circuit, a first diode, and a second diode.

[0031] The interleaved power factor correction substage includes a first input boost inductor. Second input boost inductor Full-bridge inverter and DC bus capacitor ;

[0032] The resonant inductive WPT sub-stage includes a primary series compensation network and a transmitting coil. Receiver coil and secondary series compensation network;

[0033] The output rectifier and filter module includes a second full-bridge rectifier circuit and an output filter capacitor. The second full-bridge rectifier circuit includes four output rectifier diodes.

[0034] The first full-bridge rectifier circuit includes four input rectifier diodes, namely the first input rectifier diode. Second input rectifier diode Third input rectifier diode and the fourth input rectifier diode ;

[0035] In the first full-bridge rectifier circuit, the first input rectifier diode anode and second input rectifier diodes The cathode is connected as the first input terminal of the first full-bridge rectifier circuit; the third input rectifier diode... anode and fourth input rectifier diode The cathode is connected as the second input terminal of the first full-bridge rectifier circuit; the first input rectifier diode... cathode and third input rectifier diode The cathode is connected as the positive DC output terminal of the first full-bridge rectifier circuit; the second input rectifier diode... anode and fourth input rectifier diode The anode connection is used as the DC ground output terminal of the first full-bridge rectifier circuit;

[0036] In the input differential mode filter module, the differential mode filter inductor One end is connected to the AC input voltage One end is connected to the positive terminal, and the other end is connected to the first input terminal of the first full-bridge rectifier circuit; differential mode filter capacitor One end is connected to the first input terminal of the first full-bridge rectifier circuit, and the other end is connected to the AC input voltage. The negative terminal connection is used to suppress differential-mode interference on the input side, AC input voltage. The negative terminal of the first diode is connected to the second input terminal of the first full-bridge rectifier circuit; The anode of the first diode is connected to the positive DC output terminal of the first full-bridge rectifier circuit. The cathode and the first input boost inductor of the interleaved power factor correction substage Connection; second diode The anode of the first diode is connected to the positive DC output terminal of the first full-bridge rectifier circuit. The cathode and the second input boost inductor of the interleaved power factor correction stage Connection: The DC ground output terminal of the first full-bridge rectifier circuit is connected to the negative output terminal of the full-bridge inverter;

[0037] The full-bridge inverter includes four power switching transistors, namely the first power switching transistor. Second power switching transistor Third power switching transistor and the fourth power switch Each power switch is connected in parallel with a parasitic capacitance; the first power switch The drain of the third power switch The common drain of the transistor forms the positive output terminal of the full-bridge inverter, and the second power switch transistor... The source and the fourth power switch The source terminals are connected together to form the negative output terminal of the full-bridge inverter; the first input boost inductor One end is connected to the first diode The cathode is connected, and the other end is connected to the first power switch. The source and the second power switch The common node connection of the drain; the second input boost inductor One end is connected to the second diode The cathode is connected, and the other end is connected to the third power switch. The source and the fourth power switch The common-node connection of the drain; DC bus capacitor It is connected in parallel between the positive and negative output terminals of the full-bridge inverter to stabilize the DC bus voltage.

[0038] In the resonant inductive WPT substage, the primary series compensation network is the primary compensation capacitor. Primary compensation capacitor One end is connected to the positive output terminal of the full-bridge inverter, and the other end is connected to the transmitting coil. One end; transmitting coil The other end is connected to the negative output terminal of the full-bridge inverter, forming the primary resonant circuit; the secondary series compensation network is the secondary compensation capacitor. Secondary compensation capacitor One end is connected to the receiving coil One end is connected to the first input terminal of the output rectifier and filter module; the receiving coil The other end is connected to the second input terminal of the output rectifier and filter module, forming a secondary resonant circuit; the transmitting coil With receiving coil There is mutual induction This constitutes a non-contact energy transmission channel;

[0039] The second full-bridge rectifier circuit includes four rectifier diodes, namely the first output rectifier diode. Second output rectifier diode Third output rectifier diode and the fourth output rectifier diode First output rectifier diode anode and second output rectifier diode The cathode is connected as the first input terminal of the rectifier and filter module; the third output rectifier diode... anode and fourth output rectifier diode The cathode connection serves as the second input terminal of the rectifier and filter module; the first output rectifier diode... anode receiving coil With secondary compensation capacitor The common connection node, the first output rectifier diode The cathode is connected to the positive output terminal. Second output rectifier diode cathode receiving coil With secondary compensation capacitor The common connection node, the second output rectifier diode The anode is connected to the output negative terminal. Third output rectifier diode anode receiving coil At the other end, the third output rectifier diode The cathode is connected to the positive output terminal. Fourth output rectifier diode cathode receiving coil At the other end, the fourth output rectifier diode The anode is connected to the output negative terminal. Output filter capacitor Connected in parallel to the positive output terminal and output negative terminal Between these, it is used to filter out rectified ripple and provide a stable DC output.

[0040] The resonant frequencies of the primary and secondary resonant circuits of the resonant induction WPT sub-stage are consistent with the switching frequency of the full-bridge inverter, which has a switching frequency range of 85kHz to 150kHz.

[0041] The power switching transistors of the full-bridge inverter are all N-channel power metal-oxide-semiconductor field-effect transistors, and each metal-oxide-semiconductor field-effect transistor integrates an anti-parallel body diode to achieve zero-voltage turn-on; the rectifier diodes of the full-bridge rectifier circuit are all fast recovery diodes, model RHRG3060.

[0042] The interleaved power factor correction substage operates in discontinuous conduction mode, and the first input boost inductor... Second input boost inductor The current conduction timing is staggered by 180° relative to the switching cycle of the full-bridge inverter to reduce input current ripple and electromagnetic interference.

[0043] The full-bridge inverter adopts a complementary control strategy, with the first power switch transistor... Second power switching transistor Complementary conduction, third power switch and the fourth power switch Complementary conduction, and the first power switch transistor and the third power switch The conduction timing is staggered by 180° with the first input boost inductor. Second input boost inductor The current is interleaved and synchronized.

[0044] A single-stage resonant induction WPT converter with power factor correction converts AC input voltage into a stable DC voltage. The operating conditions of the single-stage resonant induction WPT converter with power factor correction include:

[0045] Ignore the dead time of the four power switches in the full-bridge inverter, and ignore the inherent capacitance and parasitic capacitance of the four power switches in the full-bridge inverter. to Except; set the first input boost inductor Second input boost inductor The inductance values ​​are equal, and the interleaved power factor correction substage operates in discontinuous conduction mode;

[0046] When analyzing the operating modes, the influence of the input differential mode filter module is temporarily ignored, i.e., the differential mode filter inductance is neglected. Sum and difference mode filter capacitors Its function;

[0047] The power of the four power switches in the full-bridge inverter is set to be much higher than the AC input voltage. The frequency (50Hz) allows the AC input voltage to be switched within one switching cycle. It is considered a constant value.

[0048] This embodiment achieves high power factor correction by integrating the interleaved power factor correction sub-stage circuit with the full-bridge inverter into a single-stage power architecture. The core of this is that the power factor correction sub-stage operates in discontinuous conduction mode (DCM). In this mode, two interleaved parallel boost inductors... and The current returns to zero in each switching cycle, and its peak value follows the rectified sinusoidal input voltage waveform, thus making the average input current sinusoidal and automatically achieving a high power factor without the need for complex current control. Four power switching transistors... - Shared and simultaneously functioning as a power factor correction sub-stage switch and inverter bridge switch, the four power switches conduct in a complementary manner, controlling both the charging and discharging of inductor energy to correct the power factor and the DC bus capacitor. High-frequency AC square waves are generated at both ends to drive the WPT resonant network. This integrated design not only simplifies control and component count but also achieves zero-voltage turn-on for all switches by combining the resonant circuit, effectively reducing switching losses. This invention eliminates the independent power factor correction substage while achieving low input current ripple, high power factor, and high-efficiency energy transfer, thus realizing power factor correction functionality.

[0049] During the positive half-cycle of the AC input voltage, the commutation process of a single-stage resonant induction WPT converter with power factor correction includes:

[0050] Mode 1: Power Switch and On. On the power factor correction sub-side, the input voltage simultaneously affects the second input boost inductor. The charging process causes the current to rise linearly, thus stimulating the second input boost inductor. Release the stored energy to the DC bus capacitor In the middle, this causes its current to decrease linearly. On the wireless transmission side, the DC bus capacitor... Together with the input energy, a positive voltage is applied across the resonant network. This generates a resonant current in one direction, and the energy is transmitted to the receiving end through magnetic field coupling.

[0051] Mode 2: This mode is completely complementary to Mode 1, and the switching transistor... and On the PFC side, the energy flow roles are reversed: the input voltage is now applied to the first input boost inductor. Charging, while the second input boost inductor Then to the DC bus capacitor Energy is released. On the wireless transmission side, the voltage applied to the resonant network is reversed, becoming... This induces a resonant current in the opposite direction in the primary coil, continuing to transfer energy to the load. The alternation of these two modes together accomplishes the tasks of power factor correction and efficient wireless power transfer.

[0052] In mode 1 [t0~t1], the equivalent current of a single-stage resonant induction WPT converter with power factor correction is as follows: Figure 3 As shown, the second power switch in this mode and the third power switch Turn on, first power switch transistor With the fourth power switch Due to the reverse bias voltage shutdown, the single-stage resonant induction WPT converter with power factor correction maintains a zero-voltage turn-on (ZVS) state.

[0053] First input boost inductor In the discharge state, the current path of the power factor correction substage is as follows: starting from the positive terminal of the input voltage, it passes sequentially through the first input boost inductor. The second power switch that is turned on Ultimately, the current returns to the negative terminal of the input voltage; in this current path, due to the first input boost inductor... When in a discharge state, its current It shows a linear downward trend.

[0054] Second input boost inductor When charging, the PFC sub-stage current path is as follows: starting from the positive terminal of the input voltage, it passes through the second input boost inductor in sequence. The third power switch that is turned on DC bus capacitor The positive terminal then passes through the DC bus capacitor. Internally, it flows to its negative terminal and eventually returns to the negative terminal of the input voltage; in this current path, the input voltage is... Charging, its current It shows a linear upward trend.

[0055] The current path of the resonant inductive WPT substage is: from the DC bus capacitor. Starting from the positive terminal, it passes through the primary compensation capacitor in sequence. , transmitting coil The second power switch that is turned on Ultimately, it returns to the DC bus capacitor. The negative terminal; in this path, the DC bus capacitor Discharge drives the primary resonant circuit and the transmitting coil. An alternating magnetic field is generated, which is transmitted through the mutual inductance M to the receiving coil. A voltage is induced in the primary winding, which in turn drives the secondary resonant circuit, enabling the transfer of energy from the primary to the secondary winding.

[0056] In mode 2 [t1~t2], the equivalent current of a single-stage resonant induction WPT converter with power factor correction is as follows: Figure 4 As shown, the first power switch in this mode and the fourth power switch Turn on, second power switch and the third power switch Due to the reverse bias voltage being turned off, the single-stage resonant induction WPT converter with power factor correction still maintains the ZVS state.

[0057] First input boost inductor When charging, the PFC sub-stage current path is as follows: starting from the positive terminal of the input voltage, it passes through the first input boost inductor in sequence. The first power switch transistor that is turned on DC bus capacitor The positive terminal then passes through the DC bus capacitor. Internally, it flows to its negative terminal and eventually returns to the negative terminal of the input voltage; in this path, the input voltage is the first input boost inductor. Charging, its current It shows a linear upward trend.

[0058] Second input boost inductor When in the discharge state, the PFC sub-stage current path is as follows: starting from the positive terminal of the input voltage, it passes through the second input boost inductor in sequence. The fourth power switch transistor is turned on. Ultimately, it returns to the negative terminal of the input voltage; in this path, When in a discharge state, its current It shows a linear downward trend.

[0059] The current path of the resonant inductive WPT substage (continuous energy transfer) is: from the DC bus capacitor. Starting from the positive terminal, it passes sequentially through the first power switch that is turned on. , transmitting coil Primary compensation capacitor Ultimately, it returns to the DC bus capacitor. The negative terminal; in this path, the DC bus capacitor Continuous discharge maintains the primary resonant circuit in a resonant state, and the transmitting coil... The alternating magnetic field is continuously applied to the receiving coil through mutual inductance M. The induced voltage enables the continuous transfer of energy from the primary to the secondary winding.

[0060] Figure 5 The main waveform diagram of the converter in this embodiment includes the timing relationships of the following key electrical quantities:

[0061] ~ These are power switching transistors. ~ The gate drive signal of the first power switch reflects complementary conduction characteristics, specifically: With the second power switch Complementary, third power switch With the fourth power switch Complementary, first power switch With the third power switch 180° staggered timing;

[0062] and The first input boost inductor Second input boost inductor The current waveform reflects the linear rise / fall characteristics and 180° interleaving relationship in DCM mode. After superposition, the input current ripple is significantly reduced.

[0063] For transmitting coil The resonant current of the transmitting coil The resonant current waveform is a high-frequency sine wave, consistent with the switching frequency (100kHz);

[0064] The first power switch The drain-source voltage reflects the ZVS characteristic, i.e., the first power switch. Before activation, the first power switch transistor Drain-source voltage It has been reduced to 0, with no switching losses.

[0065] Due to symmetry, during the negative half-cycle of the input voltage, the converter's operating mode is consistent with that of the positive half-cycle, only the current direction is reversed. This will not be elaborated further here, and its operating waveform is as follows: Figure 5 The negative half-cycle portion is shown.

[0066] The scope of protection of this application is not limited to the embodiments described above. Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from the scope and spirit of this disclosure. If such modifications and variations fall within the scope of this disclosure and its equivalents, then the intent of this disclosure also includes these modifications and variations.

Claims

1. A resonant inductive wireless power transfer converter with power factor correction, characterized by, The input differential mode filter module, the interleaved power factor correction sub-stage, the resonant inductive WPT sub-stage and the output rectification filter module are connected in series. The input differential mode filter module includes a differential mode filter inductor, a differential mode filter capacitor, a first full-bridge rectifier circuit, a first diode and a second diode. The differential mode filter inductor has one end connected to the positive pole of the AC input voltage and the other end connected to the first input end of the first full-bridge rectifier circuit. The differential mode filter capacitor has one end connected to the first input end of the first full-bridge rectifier circuit and the other end connected to the negative pole of the AC input voltage. The negative pole of the AC input voltage is connected to the second input end of the first full-bridge rectifier circuit. The anode of the first diode is connected to the DC positive output end of the first full-bridge rectifier circuit, and the cathode of the first diode is connected to the first input boost inductor of the interleaved power factor correction sub-stage.

2. A resonant inductive wireless power transfer converter with power factor correction according to claim 1, characterized in that, The anode of the second diode is connected to the DC positive output end of the first full-bridge rectifier circuit, and the cathode of the second diode is connected to the second input boost inductor of the interleaved power factor correction sub-stage. The DC ground output end of the first full-bridge rectifier circuit is connected to the negative output end of the full-bridge inverter. The first input boost inductor has one end connected to the cathode of the first diode of the input differential mode filter module and the other end connected to the first input end of the full-bridge inverter. The second input boost inductor has one end connected to the cathode of the second diode of the input differential mode filter module and the other end connected to the second input end of the full-bridge inverter. The DC bus capacitor is connected in parallel between the positive output end and the negative output end of the full-bridge inverter. The resonant inductive WPT sub-stage includes a primary series compensation network, a transmitting coil, a receiving coil and a secondary series compensation network. The primary compensation network has one end connected to the positive output end of the full-bridge inverter and the other end connected to one end of the transmitting coil. The other end of the transmitting coil is connected to the negative output end of the full-bridge inverter, forming a primary resonant circuit. The secondary series compensation network has one end connected to one end of the receiving coil and the other end connected to the first input end of the second full-bridge rectifier circuit in the output rectification filter module. The other end of the receiving coil is connected to the second input end of the second full-bridge rectifier circuit in the output rectification filter module, forming a secondary resonant circuit. The transmitting coil and the receiving coil have mutual inductance. The output rectification filter module includes a second full-bridge rectifier circuit and an output filter capacitor. The first full-bridge rectifier circuit includes four input rectifier diodes, namely a first input rectifier diode, a second input rectifier diode, a third input rectifier diode and a fourth input rectifier diode. The first input end of the first full-bridge rectifier circuit is a common connection node of an anode of a first input rectifier diode and a cathode of a second input rectifier diode; the second input end of the first full-bridge rectifier circuit is a common connection node of an anode of a third input rectifier diode and a cathode of a fourth input rectifier diode; the direct-current positive output end of the first full-bridge rectifier circuit is a common connection node of a cathode of the first input rectifier diode and a cathode of the third input rectifier diode; and the direct-current ground output end of the first full-bridge rectifier circuit is a common connection node of an anode of the second input rectifier diode and an anode of the fourth input rectifier diode.

3. A resonant inductive wireless power transfer converter with power factor correction according to claim 1, characterized in that, The full-bridge inverter comprises four power switch tubes, namely a first power switch tube, a second power switch tube, a third power switch tube and a fourth power switch tube, and each power switch tube is connected in parallel with a parasitic capacitor; The first input end of the full-bridge inverter is a common connection node of a source of the first power switch tube and a drain of the second power switch tube; the second input end of the full-bridge inverter is a common connection node of a source of the third power switch tube and a drain of the fourth power switch tube; the positive output end of the full-bridge inverter is a common connection node of a drain of the first power switch tube and a drain of the third power switch tube; and the negative output end of the full-bridge inverter is a common connection node of a source of the second power switch tube and a source of the fourth power switch tube.

4. A resonant inductive wireless power transfer converter with power factor correction according to claim 1, characterized in that, In the resonant inductive WPT sub-stage, the primary series compensation network is a primary compensation capacitor, and the secondary series compensation network is a secondary compensation capacitor.

5. A resonant inductive wireless power transfer converter with power factor correction according to claim 1, characterized in that, The second full-bridge rectifier circuit comprises four rectifier diodes, namely a first output rectifier diode, a second output rectifier diode, a third output rectifier diode and a fourth output rectifier diode; The first input end of the second full-bridge rectifier circuit is a common connection node of an anode of the first output rectifier diode and a cathode of the second output rectifier diode; the second input end of the second full-bridge rectifier circuit is a common connection node of an anode of the third output rectifier diode and a cathode of the fourth output rectifier diode; the positive output end of the second full-bridge rectifier circuit is a common connection node of a cathode of the first output rectifier diode and a cathode of the third output rectifier diode; and the negative output end of the second full-bridge rectifier circuit is a common connection node of an anode of the second output rectifier diode and an anode of the fourth output rectifier diode.

6. A resonant inductive wireless power transfer converter with power factor correction according to claim 1, characterized in that, The resonant frequency of the primary resonant circuit and the resonant frequency of the secondary resonant circuit of the resonant inductive WPT sub-stage are consistent with the switching frequency of the full-bridge inverter.

7. A resonant inductive wireless power transfer converter with power factor correction according to claim 1, characterized in that, The full-bridge inverter adopts a complementary control strategy, the first power switch tube and the second power switch tube are complementary on, the third power switch tube and the fourth power switch tube are complementary on, and the on timing of the first power switch tube and the third power switch tube is staggered by 180°, and the current of the first input boost inductor and the second input boost inductor is synchronized with the on timing.

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