II Basic structure of radio energy transmission system

Basic structure of radio energy transmission system

Magnetic field coupled radio energy transmission technology （MC‑WPT）, Integrated magnetic field coupling technology 、
Modern electricity 力 electronic technique 、 High frequency electric energy conversion technology 、 Control technology and nonlinear modeling and simulation
Real technology and other fields 理 Theory and knowledge . This technology is applied in the field of electric vehicles 、 Household equipment
Charging and wireless charging of underwater equipment , It is divided into static wireless charging and dynamic wireless power supply . system
The basic structure of the system is mainly ： Power converter 、 Coupling mechanism 、 Resonant network 、 Resonant transformer
Heat exchanger .

One . Power converter

• Purpose ： Generate high-frequency resonant current 、AC/DC、DC/DC etc. .
• The way ： Linear amplifier 、 Switching converter, etc .
• characteristic ： Linear amplifier is suitable for occasions with relatively small power , On efficiency requirement 不 high . High power transmission requires high efficiency IPT System , Need to use power converter （ inverter ） Generate high-frequency resonant current .

can 量 Transmitter

High frequency inverter 路 The main commonly used structure is the full bridge 拓 Throw inverter 路, be based on 串 Voltage type high-frequency energy of coupled resonance 量 Change electricity 路 Pictured 8 Shown , And the output amplitude is ±Vdc High frequency square wave voltage . And by Lp And Cp constitute 串 Coupled resonant electricity 路 With low harmonic content 量 Sinusoidal current , Simultaneously excite high-frequency sinusoidal alternating magnetic field .

can 量 The receiver

can 量 The function of the receiving end is ： Through the coupling between the transmitting end and the receiving end , Receive induced electric energy in the coil at the receiving end , And can 量 transfer 理 The link converts it into the form of electrical energy required by the load .
In order to realize the regulation and stable control of the output voltage , use Buck Converter or Boost The converter feeds the output voltage 行 control , Its electricity 路 The picture is shown below .

Two . Coupling mechanism

3、 ... and . Resonant network

Simple coils are not 不 Apply to WPT System transmission , We still need to enter 行 Tuning electricity 路 The design of the , Tuning electricity 路 Just for the compensation line 路 Inductance in , Regulating electricity 路 The impedance of .
Tuning purpose

1. Adjust the line 路 Impedance characteristics .
2. Build a resonant network , It is conducive to the realization of soft switching , Reduce EMI interfere .
3. Build harmonic suppression electricity 路, Improve electricity 路 Current and voltage waveform .

classic 拓 Flapping structure

Four . Resonant converter

• advantage ： Reduce switching losses 、 High quality voltage and current output WPT The primary coil of is often 暴 露 In the air , High quality voltage and current , The waveform contains EMC The interference is relatively small .
• shortcoming ： Add additional reactive devices to participate in resonance 、 High peak current and power level 、 Work frequency 不 determine 、 Control is complex .
• classification ： Load resonant converter 、 Quasi resonant converter because WPT The system itself contains coils , Therefore, the realization of load resonant converter has 易 Realization 、 The advantage of low cost . Besides , Quasi resonant converter is only equivalent to resonant converter and PWM A conversion of converter .