The invention discloses a multi-load
wireless power transmission system with
constant power and constant efficiency characteristics. The multi-load
wireless power transmission system comprises a transmitting device and at least two receiving devices, the transmitting device is composed of a direct-current power supply, a full-bridge
inverter, a transmitting side
resonant capacitor module, a transmitting coil, a current sampling circuit, a zero-crossing
comparator and a driver which are connected in sequence. The transmitting side
resonant capacitor module comprises a transmitting side switch controller, a transmitting side communication module and at least two parallel
switched capacitor branches, and each
switched capacitor branch is formed by connecting a transmitting side switch and a transmitting side
resonant capacitor in series; each receiving device is composed of a receiving coil, a receiving side
resonance capacitor module and a load which are connected in series, and the receiving side
resonance capacitor module comprises a receiving side
resonance capacitor, a receiving side switch, a receiving side switch controller and a receiving side communication module which are connected in sequence. The method has the characteristics of
constant power and constant efficiency, high
system spatial freedom degree, high robustness,
simple circuit structure and easiness in implementation.