Wireless charging system output energy control circuit and control method

Abstract

The invention discloses a wireless charging system output energy control circuit and a control method. The control circuit comprises a primary circuit, a secondary circuit, a magnetic coupler and a load, wherein the primary circuit and the secondary circuit are connected through the magnetic coupler, and the secondary circuit is connected with the load; the primary circuit comprises an AC power supply, an AC / DC rectifier converter, a high-frequency DC / AC inverter and a primary compensation circuit connected in sequence; the secondary circuit comprises a secondary compensation circuit and a high-frequency AC / DC rectifier connected in sequence; and the high-frequency AC / DC rectifier comprises a first diode, a second diode, a first switching device and a second switching device. According to the circuit provided by the invention, the first switching device and the second switching device are adopted to replace two lower bridge arms of the original high-frequency AC / DC rectifier, better control on the secondary output energy can be realized through control on the first switching device and the second switching device, short circuit or open circuit protection on the circuit is realized and the system reliability can be improved.

Description

technical field [0001] The invention relates to the field of wireless charging, in particular to a wireless charging system output energy control circuit and control method. Background technique [0002] At present, for the energy control of wireless charging, a relatively common control method is to connect the DC / DC converter in series before the high-frequency AC converter on the primary side, and adjust the output of the system by adjusting the input voltage of the high-frequency inverter. power. However, since the DC / DC converter is connected in series before the high-frequency AC converter on the primary side, the number of converter stages in the system is additionally increased, resulting in an increase in reactive power in the circuit and reducing the overall system reliability. In addition, when there is a short circuit or an open circuit at the load end, the devices in the circuit will be destroyed due to overcurrent or overvoltage. In the prior art, a short-cir...

AI Technical Summary

Problems solved by technology

The wireless communication method inevitably has defects such as poor stability and slow transmission speed.

And because the load is on the secondary side, the control method of the primary side series DC / DC converter requires wireless communication with the secondary side for information exchange and feedback to achieve control and regulation. This communication method has poor stability and slow response time; in addition, For the method of adding an open circuit protection circuit or a short circuit protection circuit on the secondary side, the primary side controller needs to judge and control the information to realize the open circuit protection or short circuit protection. is that the time required for short-circuit protection is greatly extended, further reducing overall system reliability

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