US Patent 10044218 Micro-energy harvester for battery free applications

A micro-energy harvester that receives an input direct current (DC) voltage from a micro-energy source. The micro-energy harvester includes an oscillator and builds up the input DC voltage into an output DC voltage, where the oscillator includes a transistor that is configured to be normally off and the transistor is configured to be switched on by the micro-energy source. The micro-energy harvester outputs the output DC voltage to a micro-energy application. The micro-energy application and the micro-energy harvester are both configured to operate without a battery. The micro-energy harvester also includes an integrated power manager that provides a complete solution for transforming and storing electrical energy from micro-energy power sources to efficiently power applications that do not require continuous power.