US 2013/0154556 A1 · DC-DC CONVERTER, POWER RECEIVING DEVICE, AND POWER FEEDING SYSTEM

Abstract

A circuit capable of keeping input impedance constant is provided. Further, a circuit which can contribute to improvement in power feeding efficiency in power feeding by a magnetic resonance method is provided. A voltage (a former voltage) proportional to a direct-current voltage input to a DC-DC converter from the outside and a voltage (a latter voltage) proportional to a current input from the outside are detected, and the ratio of the former voltage and the latter voltage are held constant. Accordingly, input impedance can be kept constant. Further, impedance conversion is performed in the DC-DC converter. Thus, even when the battery in which power feeding is performed exists on an output side of the DC-DC converter, input impedance can be kept constant. Consequently, power can be supplied to a power receiving device including the DC-DC converter and the battery with high power feeding efficiency by a magnetic resonance method.

Claims18

Dependent claims

A DC-DC converter comprising:

a load;
a first circuit comprising a first resistor;
a second circuit comprising an instrumentation amplifier;
a third circuit comprising an error amplifier;
and
a first switch,
wherein one end of the load is electrically connected to one end of the first resistor and a first input terminal of the instrumentation amplifier,
wherein the other end of the load is electrically connected to a second input terminal of the instrumentation amplifier and one end of the first switch,
wherein the other end of the first resistor is electrically connected to a first input terminal of the error amplifier,
wherein the second circuit is electrically connected to a second input terminal of the error amplifier, and
wherein the third circuit is electrically connected to the first switch.

8 more elements

A DC-DC converter comprising:

a load;
a first circuit comprising a first resistor;
a second circuit comprising an instrumentation amplifier;
a third circuit comprising an error amplifier;
a first switch;
and
a diode,
wherein one end of the load is electrically connected to one end of the first resistor and a first input terminal of the instrumentation amplifier,
wherein the other end of the load is electrically connected to a second input terminal of the instrumentation amplifier and one end of the first switch,
wherein the other end of the first resistor is electrically connected to a first input terminal of the error amplifier,
wherein one end of the diode is electrically connected to the other end of the first switch,
wherein the second circuit is electrically connected to a second input terminal of the error amplifier, and
wherein the third circuit is electrically connected to the first switch.

10 more elements

Dependencies are inferred from the claim text.

Dc-dc converter, power receiving device, and power feeding system

Life of this patent

Dc-dc converter, power receiving device, and power feeding system

Life of this patent

Abstract

Claims18