Power Transfer System

摘要

A capacitance (Cp) is a capacitance formed between a transmitting-device-side passive electrode and a receiving-device-side passive electrode. A capacitance (Ca) is a capacitance formed between a transmitting-device-side active electrode and a receiving-device-side active electrode. A bridge circuit formed by Z1 to Z4 is connected to a secondary side of a step-up transformer, where Z1 represents an impedance of a first element, Z2 represents an impedance of a second element, Z3 represents an impedance of a series circuit formed by the capacitance (Ca) and a load, and Z4 represents an impedance of the capacitance (Cp). By determining the impedances Z1 to Z4 such that this bridge circuit is balanced, a potential at a receiving-device-side reference potential point is made equal to a ground potential. This reduces variation in receiving-device-side reference potential, reduces noise, and stabilizes the operation of a load circuit on the receiving device side.

主权项

1. A power transfer system comprising:
a power transmitting device having a transmitting-device-side first electrode, a transmitting-device-side second electrode, and a feeding circuit configured to feed an alternating voltage between the transmitting-device-side first electrode and the transmitting-device-side second electrode, wherein the power transmitting device includes a series circuit between the transmitting-device-side first electrode and the transmitting-device-side second electrode, the series circuit including a first element connected to the transmitting-device-side first electrode and a second element, the first element and the second element being connected in series; a transmitting-device-side reference potential point connected to a reference potential of the transmitting device, the transmitting-device-side reference potential point being a node between the first element and the second element of the series circuit; and the series circuit is configured such that a balance condition Z1×Z4≈Z2×Z3 is satisfied at a fundamental frequency of the alternating voltage, where Z1 represents an impedance of the first element, Z2 represents an impedance of the second element, Z3 represents an impedance of the series circuit including a capacitance between the transmitting-device-side first electrode and a receiving-device-side first electrode and a load circuit of a power receiving device, and Z4 represents an impedance including a capacitance between the transmitting-device-side second electrode and a receiving-device-side second electrode of the power receiving device.