Wireless Charging Circuitry for Weak-Power Implant Receivers

The patent applies periodic action by controlling the rectifier to operate in discrete cycles rather than continuously. The controller enables the rectifier to conduct during specific resonant cycles when energy storage is beneficial, and disables it during other cycles to minimize static power consumption. This periodic enable/disable pattern allows the system to accumulate energy from multiple resonant cycles while avoiding continuous power drain from the rectifier control circuitry.

The patent applies preliminary action by having the power receiving device store energy from multiple resonant cycles before the rectifier actually converts and delivers power to the load. The controller accumulates energy in the resonant circuit over several cycles, building up sufficient voltage and energy levels beforehand. This preliminary energy accumulation ensures that when power delivery is needed, there is adequate power available even if the received signal is weak due to substantial distance.

The patent applies periodic action by using a comparator that operates intermittently rather than continuously. The controller enables the comparator to detect extreme points of the output voltage signal only during specific resonant cycles when rectification is beneficial, and disables the comparator during other cycles. This periodic operation maintains synchronous control capability for efficient power transfer while dramatically reducing the power consumption of the comparator circuitry compared to continuous-time operation.