WIRELESS ELECTRICAL POWER TRANSMISSION SYSTEM AND ITS CONTROL METHOD

• US 20130300203A1
• Filed: 01/30/2011
• Published: 11/14/2013
• Est. Priority Date: 01/30/2011
• Status: Abandoned Application

• Current Assignee: Haier Group Corporation (Haier Group Company), Haier Group Technology R &AMP D Center
• Original Assignee: Haier Group Corporation (Haier Group Company), Haier Group Technology R &AMP D Center
• Inventors: Li, Dan, Dong, Xiulian, Qin, Chao, Lou, Bingbing, Li, Ming
• Application Number:
  US13/821,563
• Publication Number:
  US 20130300203A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

The present invention provides a wireless electrical power transmission system and its control method with good thermal stability. Said system, comprising a transmitting coil frequency generating part and a coil frequency phase tracking and feedback part, the transmitting coil frequency generating part composed of a control circuit, a driving circuit and an inverter circuit, the coil frequency phase tracking and feedback part composed of a frequency detection circuit and a phase locked loop circuit, is characterized in that said control circuit is controlled by software to output two opposite control signals, each of which controls opening and closing of a switch tube after passing through the driving circuit to generate high-frequency oscillation in the coil.

Claims

1. A wireless electrical power transmission system, comprising a transmitting coil frequency generating circuit and a coil frequency phase tracking and feedback circuit, wherein the transmitting coil frequency generating circuit includes a control circuit, a driving circuit and an inverter circuit, characterized in that:

the control circuit is controlled by software to output two opposite control signals, each of which controls the opening and closing of a switching tube after passing through the driving circuit, to form high-frequency oscillation in the transmitting coil.

2. The system of claim 1, wherein the control circuit of the transmitting coil frequency generating circuit includes a Microprogrammed Control Unit, and an output port of the control circuit is connected to the driving circuit, output ends of the driving circuit are respectively connected with control electrodes of a switching tube of the inverter circuit, constituting software-controlled frequency generation and controllable inverter circuits.

3. The system of claim 1, wherein the coil frequency phase tracking and feedback circuit includes a frequency voltage sampling circuit and a phase locked loop circuit, and a signal output end of the phase locked loop circuit is connected to a control port of the control circuit.

4. A control method of a wireless electrical power transmission system, characterized by comprising steps of:

providing control signals P1 and P2 with a frequency fp by a control circuit according to a frequency point fk, wherein fp=fk;

opening or closing a switching tube by a driving circuit according to the control signals P1 and P2, so that an alternating voltage is formed at both ends of a transmitting coil, so that high-frequency oscillation of the transmitting coil is started;

obtaining a frequency f of the transmitting coil, after the voltage sampling by a voltage comparison circuit;

processing the signal of the frequency f of the transmitting coil through a phase locked loop circuit, and feeding the processed signal back to the control circuit together with a phase difference signal;

adjusting outputs of the control signals P1 and P2 by the control circuit according to the feedback signal; and

repeating the above steps, so that the system is operated stably at the frequency point.