CN-121984249-A - Simple method for secondary side compensation inductance parameter design in bilateral LC compensation induction type wireless charging system

Abstract

The invention provides a simple method for designing secondary side compensation inductance parameters in a bilateral LC compensation induction type wireless charging system, and belongs to the technical field of wireless energy transmission. The primary side of the bilateral LC compensation network is composed of L 1 and C 1 , the secondary side of the bilateral LC compensation network is composed of C 2 and L 2 , the system comprises a non-contact transformer, self inductance of primary and secondary side windings of the non-contact transformer is L p 、L s respectively, coupling coefficient of the primary and secondary side windings is k, and the system adopts a tuning mode based on a transformer leakage inductance model. The invention deduces the calculation formula of L 2 , namely L 2 =L s (L 1 /L p +1/k-k through impedance analysis). The accurate design value of the L 2 can be obtained quickly only by substituting the known parameters into a formula, and the design process is simple and efficient. The invention is suitable for the design and optimization of the bilateral LC compensation induction type wireless charging system.

Inventors

• GU XINYU
• HE GUANGMING

Assignees

• 河海大学
• 淮阴师范学院

Dates

Publication Date

20260505

Application Date

20260126

Claims (3)

1. 1. A simple method for designing secondary side compensation inductance parameters in a bilateral LC compensation induction type wireless charging system is characterized in that the wireless charging system comprises an input direct-current voltage source, an inverter, a non-contact transformer, a bilateral LC compensation network, a rectifier, an output direct-current filter and a load, wherein a primary side part of the bilateral LC compensation network consists of a series compensation inductance L 1 and a parallel compensation capacitance C 1 , a secondary side part consists of a parallel compensation capacitance C 2 and a series compensation inductance L 2 of parameters to be determined, the self inductance of a primary side winding of the non-contact transformer is L p , the self inductance of a secondary side winding is L s , and the coupling coefficient between the primary side winding and the secondary side winding is k; The simple method for designing the secondary side compensation inductance parameter comprises the following steps: (1) Acquiring known parameters of a system, namely a primary side series compensation inductance L 1 , a non-contact transformer primary side winding self-inductance L p , a secondary side winding self-inductance L s and a coupling coefficient k; (2) The design value of the secondary series compensation inductance L 2 is calculated according to the following analysis: L 2 =L s (L 1 /L p + 1/k - k)。
2. 2. The simple method for designing parameters of secondary side compensating inductance according to claim 1, wherein the parameter relationship of the design resolution of the secondary side compensating inductance L 2 is clear, i.e. the design value of L 2 is related to the primary side compensating inductance L 1 , the primary and secondary side winding self-inductances L p and L s , and the coupling coefficient k, and is independent of the magnitude of the load resistance.
3. 3. The simplified method of secondary side compensated inductance parameter design of claim 1, wherein the inverter is a full-bridge or half-bridge inverter and the rectifier is a full-bridge or full-wave rectifier.

Description

Simple method for secondary side compensation inductance parameter design in bilateral LC compensation induction type wireless charging system Technical Field The invention belongs to the technical field of wireless power transmission, and particularly relates to a simple method for designing secondary side compensation inductance parameters in a bilateral LC compensation induction type wireless charging system, which is suitable for wireless charging devices of unmanned aerial vehicles, underwater submarines, automatic guided vehicles, new energy automobiles and other systems. Background The inductive power wireless transmission (Wireless Power Transfer, WPT) system realizes non-contact transmission of power through electromagnetic inductive coupling between a primary winding and a secondary winding of a non-contact transformer, and physical contact does not exist between the primary winding and the secondary winding. A typical system includes an input dc source for the primary, an inverter, a primary compensation network and primary windings, and a secondary winding for the secondary, a secondary compensation network, a rectifier, a dc filter and a load. The primary side and secondary side compensation networks of the wireless charging system are used for compensating reactive power in the system, so that the power transmission capacity and efficiency of the system are improved. The system compensation network is generally represented by a primary side compensation network type/a secondary side compensation network type, and the primary side compensation network or the secondary side compensation network can be formed by a series capacitor (S), a parallel capacitor (P), a series inductor plus a parallel capacitor (LC) or the like. When the inverter is a voltage type inverter, there are mainly S/S compensation, S/P compensation, LC/S compensation, LC/P compensation and double-sided LC compensation. The primary side compensation network of the double-side LC compensation consists of a series compensation inductance L 1 and a parallel compensation capacitance C 1, and the secondary side compensation network consists of a parallel compensation capacitance C 2 and a series compensation inductance L 2. The primary LC compensation network and the primary winding self inductance L p form a primary LCL topology, and the secondary LC compensation network and the secondary winding self inductance L s form a secondary LCL topology, so the double-sided LC compensation is also referred to as double-sided LCL compensation. The wireless charging system with bilateral LC compensation generally has the following two tuning modes, namely a tuning mode based on a transformer mutual inductance model and a tuning mode based on a transformer leakage inductance model. The output current of the system in the two tuning modes is not influenced by load, namely, the system has constant current output characteristics. The common tuning mode is a tuning mode (Wang Wei, bao Guang, meng Tao, etc.) based on a transformer mutual inductance model, wherein a non-contact transformer adopts a mutual inductance model, the self inductance of a primary winding is L p, the self inductance of a secondary winding is L s, 1/omega 02=L1C1=LpC1 is satisfied between a primary LC compensation network and the self inductance of the primary winding L p, 1/omega 02=L2C2=LsC2 is satisfied between the secondary LC compensation network and the self inductance of the secondary winding L s, omega 0=2πf0 is resonant angular frequency, f 0 is resonant frequency, and the system can realize the fundamental Zero phase angle (Zero PHASE ANGLE, ZPA) control of an inverter under the resonant state, namely the input impedance of the primary is pure resistance. The tuning mode has simple system parameter design process, but the rectifier easily enters a current interruption mode when in heavy load, thereby increasing the difficulty of system modeling and accurate adjustment of output power. In order to solve the problems of easy interruption of rectifier heavy load and difficult system modeling and accurate adjustment of output power caused by the tuning mode based on the transformer mutual inductance model, the university of Harbin industry Xu Dianguo teaches that the team provides the tuning mode based on the transformer leakage inductance model （Yao Yousu, Wang Yijie, Liu Xiaosheng, Lin Fanfan, and Xu Dianguo. A Novel Parameter Tuning Method for a Double-Sided LCL Compensated WPT System With Better Comprehensive Performance[J]. IEEE Trans. Power Electron, 2018,33(10):8525–8536.）. When the tuning mode based on the transformer leakage inductance model is used for a wireless charging system with bilateral LC compensation, the prior art method for designing the secondary side compensation inductance parameter is described as follows. the non-contact transformer adopts a primary side leakage inductance L pl, The excitation inductance L m and the secondary side leakage