ENERGY SCAVENGING DEVICE, AND SENSOR DEVICE, AND LIGHTING SYSTEM

摘要

A power scavenger circuit (180) in a sensor device (100) for a lighting system (1) comprises: - a controllable boost converter (110) having an input (111, 112) for receiving an input current (Iin) from an interface (2), and having an output (119a, 119b) for providing an output voltage (VB); - a capacitor (130) coupled to the output of the boost converter (110); - a second converter (140) having an input (141, 142) coupled to the capacitor and having an output (149a, 149b) for providing a supply voltage (VDD) for a microprocessor (150). A scavenging control device (120) has a sensing input (121) coupled to said converter input for sensing the voltage (Vout) at said converter input. The scavenging control device controls the boost converter in such manner that the sensed voltage is kept constant, so that the voltage at said interface can be considered as an output signal from the sensor device.