Decoupling circuits
First Claim
1. A switchable circuit for receiving power from an alternating current power supply by inductive power transfer, said circuit is substantially resonant at the frequency of the received power, but is substantially decouplable from the power supply by operating a switch, said switch operates cyclically at a frequency unrelated to the power supply frequency, wherein a theoretical output voltage and a theoretical output current are functions of the fractional time the switch is on divided by the fractional time the switch is off whereby either the output current or output voltage is controllable in a range at least one of above and below that induced in the circuit, and the quality factor of the circuit being reducible to zero by appropriate choice of the fractional time the switch is on, wherein the quality factor in the circuit is defined as a ratio of power stored in the circuit reactance versus power dissipated in the circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
Power taken inductively from the alternating current in a track is received by a resonant circuit which is at least partially decoupled by a switching circuit asynchronously with the frequency of the power supply. The switch on and off time is controlled to regulate the output power, either the voltage or the current output being a function of the switch off time divided by the switch on time.
28 Citations
13 Claims
- 1. A switchable circuit for receiving power from an alternating current power supply by inductive power transfer, said circuit is substantially resonant at the frequency of the received power, but is substantially decouplable from the power supply by operating a switch, said switch operates cyclically at a frequency unrelated to the power supply frequency, wherein a theoretical output voltage and a theoretical output current are functions of the fractional time the switch is on divided by the fractional time the switch is off whereby either the output current or output voltage is controllable in a range at least one of above and below that induced in the circuit, and the quality factor of the circuit being reducible to zero by appropriate choice of the fractional time the switch is on, wherein the quality factor in the circuit is defined as a ratio of power stored in the circuit reactance versus power dissipated in the circuit.
Specification