Overload energy self-backflow type wireless power supply protection system

Abstract

The invention provides an overload energy self-backflow type wireless power supply protection system, and the system comprises a topology circuit module which is used for constructing a self-adaptive harmonic topology circuit based on a circuit device; and the power supply protection module is used for controlling the self-adaptive harmonic topology circuit based on a preset working condition, performing energy backflow, and completing overload energy self-backflow type wireless power supply protection of the power supply unit in the self-adaptive harmonic topology circuit. The method can be applied to the fields of power electronic equipment, energy storage systems and power conversion so as to improve the safety and energy utilization efficiency of the system.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric energy management and protection, and particularly relates to an overload energy self-return type wireless power supply protection system. Background Art

[0002] Overvoltage protection and energy recovery are two key issues in power electronics, energy storage, and efficient power management. Currently, common power management systems primarily utilize traditional overvoltage protection circuits and unidirectional energy flow architectures, but these solutions present numerous challenges and shortcomings.

[0003] Existing overvoltage protection methods, such as TVS diodes and varistors, typically prevent system damage by absorbing excess energy and converting it into heat. This approach has low energy efficiency and can cause thermal damage or shorten device lifespans. Furthermore, the overvoltage protection response in some circuit structures is slow, making it unable to effectively suppress sudden overvoltage spikes, potentially damaging the system's power devices.

[0004] Traditional power electronics systems typically have a unidirectional energy flow mode, meaning that electrical energy can only flow from the power supply to the load, with no energy recovery possible. When the load changes or a voltage surge occurs in the system, excess energy can only be dissipated through dissipative components (such as resistors and diodes), failing to achieve effective energy recovery and reuse. Furthermore, with the development of industries such as new energy, electric vehicles, and power transmission, the requirements for power management systems are becoming increasingly stringent, with efficient energy utilization and adaptive protection being the focus of industry attention. For example, in applications such as bidirectional DC-DC converters and battery management systems (BMS), simple overvoltage protection can no longer meet actual needs. The system requires a solution that can achieve intelligent energy return while ensuring safety. Summary of the Invention

[0005] The present invention provides an overload energy self-return type wireless power supply protection system to solve the problems of low overvoltage protection efficiency and insufficient energy return capacity in the prior art.

[0006] Overload energy self-return wireless power supply protection system, including:

[0007] Topology circuit module, used to build adaptive harmonic topology circuits based on circuit devices;

[0008] The power supply protection module is used to control the adaptive harmonic topology circuit based on preset working conditions to perform energy reflux and complete the overload energy self-reflux wireless power supply protection of the power supply unit in the adaptive harmonic topology circuit.

[0009] Preferably, the adaptive harmonic topology circuit includes: a DC voltage source, a half-bridge inverter, a full-bridge rectifier, a mutual inductance coil, a resonant capacitor, a filter capacitor, a parasitic resistor, an energy storage capacitor, an actual load and an overvoltage protection diode; wherein,

[0010] Two half-bridge inverters are respectively connected to the DC voltage source and the energy storage capacitor;

[0011] One end of the mutual inductance coil is connected in series with the resonant capacitor and the parasitic resistor, and the other end is connected to the full-bridge rectifier;

[0012] The other end of the resonant capacitor is connected to the full-bridge rectifier;

[0013] The actual load is connected to both ends of the filter capacitor;

[0014] The cathode of the overvoltage protection diode D0 is connected to a DC voltage source and a half-bridge inverter, and the anode of the overvoltage protection diode D0 is connected to the energy storage capacitor and another half-bridge inverter.

[0015] Preferably, the half-bridge inverter includes a first half-bridge inverter and a second half-bridge inverter; the first half-bridge inverter is composed of switching devices MOSFET tubes S1 and S2 and a bridge arm; the second half-bridge inverter is composed of MOSFET tubes S3 and S4 and a bridge arm; wherein S3 and S4 lag S1 and S2 by 90° in phase;

[0016] The positive terminal of the DC voltage source is connected to the gate of S1, and the negative terminal is connected to the drain of S2;

[0017] The energy storage capacitor is connected to the gate of S3 and the drain of S4 respectively;

[0018] The cathode of the overvoltage protection diode is connected to the positive polarity end of the DC voltage source and the gate of S1, and the anode of the overvoltage protection diode D0 is connected to the upper end of the energy storage capacitor and the gate of S3.

[0019] Preferably, the DC voltage source includes a DC voltage source V i1 and DC voltage source V i2 ; Wherein, the DC voltage source V i2 is the power supply unit.

[0020] Preferably, the topology circuit module dynamically adjusts the reactive energy by controlling two half-bridge inverters, and the control process of the half-bridge inverter includes:

[0021] Based on S1 and S2, the DC voltage source V i1 Perform inversion operation to generate square wave v1;

[0022] Based on S3 and S4, the reactive energy in the system is captured and stored in the energy storage capacitor, and the energy storage capacitor generates a DC voltage source V i2 ;

[0023] Based on S3 and S4, the DC voltage source V i2 Perform inversion operation to generate square wave v2;

[0024] By periodically switching S1, S2, S3, and S4, the system can adaptively adjust the resonant state under different loads or coupling coefficient changes.

[0025] Preferably, the full-bridge rectifier includes diodes D1, D2, D3 and D4; wherein the cathode of D1 is connected to the cathode of D3, and the anode of D2 is connected to the anode of D4.

[0026] Preferably, the mutual inductance coil includes a transmitting end coil and a receiving end coil;

[0027] The resonant capacitor includes a transmitting end resonant capacitor and a receiving end resonant capacitor.

[0028] Preferably, the power supply protection module includes:

[0029] The working condition monitoring unit is used to monitor the voltage stress of the adaptive harmonic topology circuit. When the voltage stress does not meet the preset working condition, the overvoltage protection diode is automatically turned on and the voltage stress of the adaptive harmonic topology circuit is clamped within a preset safety range. The preset working condition is the DC voltage source V i1 >DC voltage source V i2 ;

[0030] The energy return unit is used to return excess energy based on the automatically turned-on overvoltage protection diode.

[0031] Compared with the prior art, the present invention has the following advantages: the present invention sets an overvoltage protection diode D0 based on the adaptive tuning topology, which improves the energy utilization of the system while achieving overvoltage protection. i2 Greater than or equal to V i1 ), the overvoltage protection diode D0 automatically turns on, and the voltage V i2 Clamped in a safe range (less than V i1 ), while transferring excess energy along Figure 1The topmost wire is fed back to the left side to improve power utilization. Compared with traditional overvoltage protection solutions, this technology can not only effectively suppress overvoltage shocks and avoid component damage, but also reduce energy loss and heat dissipation requirements, improving system stability and operating efficiency. In addition, the circuit adopts a T-shaped topology, which helps to optimize the spatial layout of the circuit and reduce the area occupied by components. It is suitable for occasions with limited space, especially multi-functional or compact circuit designs. The system of the present invention can be widely used in fields such as wireless power transmission, DC-DC converters, and new energy power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a basic topology diagram of the overload energy self-reflow wireless power supply protection system according to an embodiment of the present invention;

[0034] Figure 2 This is an equivalent topology diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figure 1 As shown, the overload energy self-reflow wireless power supply protection system includes: a topology circuit module and a power supply protection module.

[0039] The topology circuit module is used to construct adaptive harmonic topology circuits based on circuit devices.

[0040] A further embodiment is that the adaptive harmonic topology circuit includes: a DC voltage source, a half-bridge inverter, a full-bridge rectifier, a mutual inductance coil, a resonant capacitor C S , filter capacitor C0, parasitic resistance R s1 , energy storage capacitor Ci2 , actual load R and overvoltage protection diode D0; where,

[0041] The two half-bridge inverters are respectively connected to a DC voltage source and an energy storage capacitor;

[0042] One end of the mutual inductance coil is connected in series with the resonant capacitor and the parasitic resistor, and the other end is connected to the full-bridge rectifier;

[0043] The other end of the resonant capacitor is connected to the full-bridge rectifier;

[0044] The actual load R is connected to both ends of the filter capacitor C0;

[0045] The cathode of the overvoltage protection diode D0 is connected to a DC voltage source and a half-bridge inverter (a first half-bridge inverter), and the anode of the overvoltage protection diode D0 is connected to an energy storage capacitor and another half-bridge inverter (a second half-bridge inverter).

[0046] In a further embodiment, the half-bridge inverter includes a first half-bridge inverter and a second half-bridge inverter; the first half-bridge inverter includes switching devices MOSFETs S1 and S2 and a bridge arm; the second half-bridge inverter includes MOSFETs S3 and S4 and a bridge arm; wherein S3 and S4 lag S1 and S2 by 90° in phase;

[0047] DC voltage source V i1 The positive electrode is connected to the gate of S1, and the negative electrode is connected to the drain of S2;

[0048] Energy storage capacitor C i2 Connected to the gate of S3 and the drain of S4 respectively;

[0049] The cathode of the overvoltage protection diode D0 is connected to the positive polarity end of the DC voltage source and the gate of S1, and the anode of the overvoltage protection diode D0 is connected to the energy storage capacitor C i2 The upper end of S1 is connected to the gate of S3.

[0050] A further embodiment is that the DC voltage source comprises a DC voltage source V i1 and DC voltage source V i2 Wherein, the DC voltage source V i2 is the power supply unit.

[0051] A further embodiment is that the topology circuit module dynamically adjusts the reactive energy by controlling two half-bridge inverters, and the control process of the half-bridge inverter includes:

[0052] Based on S1 and S2, the DC voltage source V i1 Perform inversion operation to generate square wave v1;

[0053] Based on the S3 and S4 capture system (overload energy self-reflow wireless power supply protection system) inactive energy and stored in the energy storage capacitor, the energy storage capacitor generates a DC voltage source V i2 ;

[0054] Based on S3 and S4, the DC voltage source V i2 Perform inversion operation to generate square wave v2;

[0055] By periodically switching S1, S2, S3, and S4, the system can adaptively adjust the resonant state under different loads or coupling coefficient changes.

[0056] In a further embodiment, the full-bridge rectifier includes diodes D1 , D2 , D3 and D4 , wherein the cathode of D1 is connected to the cathode of D3 , and the anode of D2 is connected to the anode of D4 .

[0057] In this embodiment, the receiving end coil L s One end and the resonant capacitor C S and the parasitic resistance R s1 The other end of the resonant capacitor is connected to the anode of D2 and the cathode of D4. The other side of the resonant capacitor is connected to the anode of D1 and the cathode of D3. One end of the filter capacitor C0 is connected to the anode of D1 and the cathode of D2, and the other end is connected to the anode of D3 and the anode of D4.

[0058] A further embodiment is that the mutual inductance coil includes a transmitting end coil and a receiving end coil L s ;

[0059] Resonant capacitor C S Including the transmitting end resonant capacitor and the receiving end resonant capacitor.

[0060] Specifically, the adaptive tuning technology realizes dynamic adjustment of reactive energy through the switch control of S1, S2 and S3, S4. MOSFET tubes S1 and S2, MOSFET tubes S3 and S4 are two sets of complementary switches, among which S1 and S2 realize the DC voltage source V i1 The inverter operation generates a square wave v1. S3 and S4 lag the phase of S1 and S2 by 90°, which can capture the reactive energy in the system and store it in the large capacitor C. i2 Here, the capacitor C i2 Large enough to generate a stable DC voltage source V i2 , consistent with square wave v1, generates square wave v2 through the inversion operation of S3 and S4. By periodically switching the switches, the system can adaptively adjust the resonant state under varying loads or coupling coefficients, improving power transmission capability and robustness.

[0061] The power supply protection module is used to control the adaptive harmonic topology circuit based on preset working conditions, perform energy reflux, and complete the overload energy self-reflux wireless power supply protection of the power supply unit in the adaptive harmonic topology circuit.

[0062] In a further embodiment, the power supply protection module includes:

[0063] The working condition monitoring unit is used to monitor the voltage stress of the adaptive harmonic topology circuit. When the voltage stress does not meet the preset working condition, the overvoltage protection diode is automatically turned on and the voltage stress of the adaptive harmonic topology circuit is clamped within a preset safety range. The preset working condition is the DC voltage source V i1 >DC voltage source V i2 ;

[0064] The energy return unit is used to return excess energy based on the automatically turned-on overvoltage protection diode.

[0065] In this embodiment, the system topology diagram is as follows: Figure 1 、 Figure 2 As shown. i1 is a DC voltage source, v fa1 、v fa2 They are the fundamental components of v1 and v2 obtained by Fourier decomposition. S1 and S2, S3 and S4 are two groups of half-bridge inverters composed of MOSFETs. L1 is the primary coil, L2 is the secondary coil, C1 and C s is the compensation capacitor, C i2 For large energy storage capacitors, R S and R S1 is the stray resistance on the coil; M is the resistance of L1 and L s The mutual inductance between them, ω is the operating angular frequency, k is the coupling coefficient, R L is the load. According to the mutual inductance theory, the receiver can be regarded as an equivalent impedance Z eq ,Re(Z eq ) is Z eq The real part of Im(Z eq ) is Z eq The imaginary part of .

[0066] When the adaptive tuning system works under normal conditions (the system is slightly detuned), the voltage V i1 Typically lower than V i2 However, when the system operating frequency deviates too much from the resonance point, the system will have too much reactive energy, causing the voltage V i2 Greater than V i1 At this time, the overvoltage protection diode D0 will be turned on, and V i2 Clamped within a safe range (usually no greater than V i1 ) and conducts the energy back to the DC voltage source V through the circuit where the diode is locatedi1 , achieving the goal of protecting the circuit while also improving the power utilization of the system.

[0067] The critical condition for diode D0 to conduct is:

[0068]

[0069] in:

[0070]

[0071] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. Overload energy self-reflow wireless power supply protection system, characterized by: include: Topology circuit module, used to build adaptive harmonic topology circuits based on circuit devices; The power supply protection module is used to control the adaptive harmonic topology circuit based on preset working conditions to perform energy reflux and complete the overload energy self-reflux wireless power supply protection of the power supply unit in the adaptive harmonic topology circuit.

2. The system according to claim 1, wherein: The adaptive harmonic topology circuit includes: a DC voltage source, a half-bridge inverter, a full-bridge rectifier, a mutual inductance coil, a resonant capacitor, a filter capacitor, a parasitic resistor, an energy storage capacitor, an actual load and an overvoltage protection diode D0; wherein, Two half-bridge inverters are respectively connected to the DC voltage source and the energy storage capacitor; One end of the mutual inductance coil is connected in series with the resonant capacitor and the parasitic resistor, and the other end is connected to the full-bridge rectifier; The other end of the resonant capacitor is connected to the full-bridge rectifier; The actual load is connected to both ends of the filter capacitor; The cathode of the overvoltage protection diode D0 is connected to a DC voltage source and a half-bridge inverter, and the anode of the overvoltage protection diode D0 is connected to the energy storage capacitor and another half-bridge inverter.

3. The system according to claim 2, characterized in that The half-bridge inverter includes a first half-bridge inverter and a second half-bridge inverter; the first half-bridge inverter is composed of switching devices MOSFET tubes S1 and S2 and a bridge arm; the second half-bridge inverter is composed of MOSFET tubes S3 and S4 and a bridge arm; wherein S3 and S4 lag S1 and S2 by 90° in phase; The positive terminal of the DC voltage source is connected to the gate of S1, and the negative terminal is connected to the drain of S2; The energy storage capacitor is connected to the gate of S3 and the drain of S4 respectively; The cathode of the overvoltage protection diode D0 is connected to the positive polarity end of the DC voltage source and the gate of S1, and the anode of the overvoltage protection diode D0 is connected to the upper end of the energy storage capacitor and the gate of S3.

4. The system according to claim 3, characterized in that The DC voltage source includes a DC voltage source V i1 and DC voltage source V i2 ; Wherein, the DC voltage source V i2 is the power supply unit.

5. The system according to claim 4, characterized in that The topology circuit module dynamically adjusts the reactive energy by controlling two half-bridge inverters. The control process of the half-bridge inverter includes: Based on S1 and S2, the DC voltage source V i1 Perform inversion operation to generate square wave v1; Based on S3 and S4, the reactive energy in the system is captured and stored in the energy storage capacitor, and the energy storage capacitor generates a DC voltage source V i2 ; Based on S3 and S4, the DC voltage source V i2 Perform inversion operation to generate square wave v2; By periodically switching S1, S2, S3, and S4, the system can adaptively adjust the resonant state under different loads or coupling coefficient changes.

6. The system according to claim 2, wherein: The full-bridge rectifier includes diodes D1, D2, D3 and D4; wherein the cathode of D1 is connected to the cathode of D3, and the anode of D2 is connected to the anode of D4.

7. The system according to claim 2, wherein: The mutual inductance coil includes a transmitting end coil and a receiving end coil; The resonant capacitor includes a transmitting end resonant capacitor and a receiving end resonant capacitor.

8. The system according to claim 4, wherein: The power supply protection module includes: The working condition monitoring unit is used to monitor the voltage stress of the adaptive harmonic topology circuit. When the voltage stress does not meet the preset working condition, the overvoltage protection diode is automatically turned on and the voltage stress of the adaptive harmonic topology circuit is clamped within a preset safety range. The preset working condition is the DC voltage source V i1 >DC voltage source V i2 ; The energy return unit is used to return excess energy based on the automatically turned-on overvoltage protection diode D0.

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