Wireless power system for portable devices under rotational misalignment

A wireless power system comprising a wireless power transmitter and a wireless power receiver capable of being operatively associated with said wireless power transmitter,

• (A) said wireless power transmitter comprising:
• (a) a first circuit comprising a switch network and receiving an input voltage from an external power source,
• (b) a second circuit comprising a variable matching circuit, operatively associated with said first circuit to appropriately bias and allow said wireless power system to regulate transmitted power, said second circuit being connected between said first circuit and a transmitter coil,
• (c) said transmitter coil configured to wirelessly transmit power to said wireless power receiver, and
• (d) a third circuit comprising a control logic block, an analog to digital converter (ADC) and a modulator/demodulator block and configured to provide a pulse width modulated signal to said first circuit, wherein said third circuit is configured to perform one or more of:
• sensing the level of magnetic flux coupling between said transmitter coil of said wireless power transmitter and a receiver coil of said wireless power receiver;
• driving of said first circuit to change a topology of said switch network;
• driving of said second circuit to change said variable matching circuit's impedance characteristics;
• and constraining the frequency and duty cycle of said pulse width modulated signal to a range of values and varying said frequency and said duty cycle of said pulse width modulated signal within those respective ranges;
• (B) said wireless power receiver for receiving and conditioning the wireless power from said wireless power transmitter, said wireless power receiver comprising:
• (a) a receiver coil to receive wireless power,
• (b) an impedance network to control amount of wireless power received,
• (c) a rectifier to condition alternating current (AC) power into direct current (DC) power,
• (d) a protection circuit to monitor certain internal dynamic circuit characteristics of the wireless power receiver and configured to take rapid appropriate action if the circuit characteristics are not within acceptable bounds,
• (e) an analog to digital converter (ADC) block,
• (f) a modulator/demodulator block to maintain operative communication between said wireless power receiver and said wireless power transmitter,
• (g) a control logic to monitor internal dynamic circuit characteristics of said wireless power receiver and configured to communicate messages via said modulator/demodulator block to said wireless power transmitter;
• said wireless power transmitter configured to sense said level of magnetic flux coupling under planar, orthogonal and intermediate modes of rotational misalignment and physical displacement in the X-plane, Y-plane and Z-plane,
• said wireless power transmitter compensating for said level of magnetic flux coupling by performing one or more of:
• driving of said first circuit to change a topology of said switch network;
• driving of said second circuit to change said variable matching circuit's impedance characteristics;
• and constraining said frequency and said duty cycle of said pulse width modulated signal to a range of values and varying said frequency and said duty cycle of said pulse width modulated signal within those respective ranges;
• whereby said change in one or more of:
• said topology of said switch network,
• said impedance of variable matching circuit,
• said frequency range of said pulse width modulated signal,
• said duty cycle range of said pulse width modulated signal,
• ensures that said wireless power system can satisfy said wireless power receiver's downstream load compensating for said rotational misalignment and said physical displacement in the X-plane, Y-plane and Z-plane between said transmitter coil of said wireless power transmitter and said receiver coil of said wireless power receiver.