Wireless power transfer system adapting to multi-load dynamic switching
A technology of wireless power transmission and load switching, which is applied in the direction of circuit devices and electrical components, and can solve problems such as overcurrent of switching devices, overvoltage and undervoltage of output voltage of secondary side modules, triggering self-protection circuits, etc., to ensure stability Sexuality, stable work, and the effect of reducing impact
Active Publication Date: 2018-10-19
HAIER GRP CORP +1
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Problems solved by technology
In practical applications, when performing multi-load dynamic switching, the reflected impedance of the secondary side module will change, and the sudden change of reflected impedance will cause a sudden change in the resonance frequency of the entire system, and the transient driving frequency in the power supply of the transmitter cannot be maintained at the resonance frequency. Consistent, the system works in a detuned state, which will cause the current of the switching device in the inverter circuit to overcurrent, burn the switching device in severe cases, or trigger the self-protection circuit, causing the system to fail; at the same time, the output voltage of the secondary module will appear overvoltage And undervoltage problems, which affect the normal operation of the load, resulting in the wireless power transmission system not working properly
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[0034] Such as figure 1 As shown, a schematic structure diagram of the wireless power transmission system adapting to multi-load dynamic switching of the present invention is given. The system includes a primary-side module for transmitting electric energy and a secondary-side module for picking up electric energy, and the primary-side module transmits electric energy to the secondary-side module through electromagnetic coupling resonance.
[0035] The primary side module mainly includes the following parts:
[0036] Rectification filter voltage stabilization circuit: Mainly rectify and filter the AC power, output stable DC power as the input of the inverter circuit;
[0037] Auxiliary power supply: provide power to the inverter control circuit;
[0038] Inverter circuit: convert the DC voltage into a high-frequency AC voltage as the excitation of the primary resonant coil;
[0039] Inverter control circuit: output the PWM drive control of the inverter circuit, and adjust t...
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The invention discloses a wireless power transmission system adapting to multi-load dynamic switching, which includes a primary side module for realizing power transmission and a secondary side module for power picking up, and the primary side module transmits power to the secondary side module through electromagnetic coupling resonance. When the secondary side module is switching between different power loads, the reflected impedance of the secondary side is gradually increased through soft switching to gradually increase the voltage at both ends of the load, so that the resonant frequency and phase changes of the primary side module are kept at their frequency tracking control adaptive within range. The primary side module of the system can adjust smoothly according to the dynamic change of the load, so that the primary side module can work stably; at the same time, for the output voltage of the system, since the load switching adopts soft switching to change the load, the impact of the load change on the system resonance is reduced. It also ensures the stability of the output voltage of the secondary side of the system, and there is no overshoot or undervoltage of the output voltage.
Description
technical field [0001] The invention belongs to the field of wireless power transmission, and in particular relates to a wireless power transmission system adaptable to multi-load dynamic switching. Background technique [0002] Most of the traditional power transmission methods transmit power to end products through wires or sockets. This transmission method will bring friction and easily generate sparks and other problems, which will affect the safety and reliability of electrical equipment. Wireless power transmission technology can free us from The traditional power transmission method realizes a new type of non-contact power transmission. Magnetic coupling resonant wireless power transmission technology uses magnetic coupling and resonance technology to realize wireless transmission of electric energy, which has a longer transmission distance and higher transmission efficiency. Compared with electromagnetic wave and electromagnetic induction wireless power transmission ...
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IPC IPC(8): H02J50/12
CPCH02J50/12
Inventor 李聃孙会秦超龙海岸娄兵兵
Owner HAIER GRP CORP