Abstract:
The highly efficient multi-frequency voltage regulating circuit is capable of converting magnetic field energy to electrical energy for charging either a battery or an energy storage device such as a capacitor. The invention provides a magnetic field sensor circuit that measures the strength of incoming magnetic field energy with respect to a reference current. The invention also provides for a programmable magnetic field detection circuit which is used to adjust the detection level of the inductor-capacitor magnetic field converter circuit. A discharge expediter circuit is provided to improve the efficiency of the magnetic field converter circuit by discharging excess energy.
Abstract:
An integrated circuit full-wave rectifier which can be implemented in CMOS technology comprises a first pair of N channel transistors (104, 106) arranged to switch on opposing half cycles of an a.c. input signal and having their gates connected to receive opposing half cycles; and a second pair of N channel transistors (102, 108) also arranged to switch on opposing half cycles and being connected in common drain mode. The circuit may also be provided with a voltage limiter circuit comprising a third pair (112, 114) and a fourth pair (118, 120) of N channel transistors arranged to operate on opposing half cycles, a first transistor (114, 120) of each pair being connected in common drain mode and the gates of the other transistor (112, 118) of each pair being supplied from a P channel transistor (110), the P channel transistor having its gate supplied with a reference voltage.