Wireless charging system and operating method thereof

A wireless charging system, comprising:

• a wireless power transmitter, comprising:
• a power input terminal configured to receive an input power;
• a power management unit coupled to the power input terminal, configured to generate N first voltage control signals according to the N communication signals;
• and
• M transmission modules, each transmission module comprising:
• a power controller coupled to the power management unit, configured to convert the input power to a first DC (direct-current) signal according to a first voltage control signal of the N first voltage control signals;
• a bridge driver coupled to the power controller, configured to convert the first DC signal to a first AC (alternating-current) signal and to transmit one of the N communication signals to the power management unit;
• and
• a transmission unit coupled to the bridge driver, configured to wirelessly transmit a wireless power signal according to the first AC signal, wirelessly receive the communication signal, and transmit the communication signal to the bridge driver;
• and
• N wireless power receivers configured to receive N wireless power signals from N transmission units of N transmission modules respectively, and wirelessly transmit the N communication signals to the N transmission units of the N transmission modules respectively;
• wherein M≥N>1.

An operating method for a wireless charging system, the wireless charging system comprising a wireless power transmitter and N wireless power receivers, the wireless power transmitter comprising a power input terminal and M transmission modules, each transmission module comprising a power controller, a power management unit, a bridge driver, and a transmission unit, the method comprising:

• when the power management unit receives a communication signal, M power management units of the M transmission modules transmitting M control signals for handshaking communication;
• the power management unit generating a first voltage control signal according to the communication signal;
• the power controller converting an input power to a first DC signal according to the first voltage control signal;
• the bridge driver converting the first DC signal to a first AC signal;
• the transmission unit wirelessly transmitting a wireless power signal according to the first AC signal;
• and
• the N wireless power receivers respectively receiving N wireless power signals from N transmission units of N transmission modules;
• wherein M≥N>1.

An operating method for a wireless charging system, the wireless charging system comprising a wireless power transmitter and N wireless power receivers, the wireless power transmitter comprising a power input terminal, a power management unit, and M transmission modules, each transmission module comprising a power controller, a bridge driver, and a transmission unit, the method comprising:

• when the power management unit receives a communication signal, the power management unit generating a first voltage control signal according to the communication signal;
• the power controller converting an input power to a first DC signal according to the first voltage control signal;
• the bridge driver converting the first DC signal to a first AC signal;
• the transmission unit wirelessly transmitting a wireless power signal according to the first AC signal;
• and
• the N wireless power receivers respectively receiving N wireless power signals from N transmission units of N transmission modules;
• wherein M≥N>1.