Power feed device of inductive charging device
View Patent ↗A power feeding device of a non-contact charging device includes a power factor improvement circuit which converts an AC power supply to DC, and improves a power factor, a smoothing capacitor connected to an output end of the power factor improvement circuit, an inverter circuit which includes a plurality of switching elements, and generates an AC signal using a voltage of the smoothing capacitor as a power supply, a power feeding section which feeds power based on the AC signal to a power receiving device, and a control circuit which modulates at least one of a duty factor or an operation frequency of each of the switching elements of the inverter circuit in synchronization with the AC power supply.
1. A power feeding device of a non-contact charging device for feeding power to a power receiving device in a non-contact fashion, the power feeding device comprising:
a power factor improvement circuit which converts an AC power supply to DC, and improves a power factor,
an input detector which detects input from the AC power supply to the power feeding device,
a smoothing capacitor connected to an output end of the power factor improvement circuit,
an inverter circuit which includes a plurality of switching elements, and generates an AC signal by switching each of the switching elements using a voltage of the smoothing capacitor as a power supply,
a power feeding section which includes a resonant capacitor and a first inductor connected to an output end of the inverter circuit, and feeds power generated between the first inductor and a second inductor provided in the power receiving device to the power receiving device based on the AC signal, and
a control circuit which modulates a duty factor of each of the switching elements of the inverter circuit in synchronization with the AC power supply at an amount of modulation determined based on the input from the AC power supply to the power feeding device detected by the input detector, when the power feeding section feeds the power to the power receiving device,
wherein the control circuit increases the amount of modulation of the duty factor of the plurality of switching elements with increase in the input from the AC power supply to the power feeding device detected by the input detector.
2. A power feeding device of a non-contact charging device for feeding power to a power receiving device in a non-contact fashion, the power feeding device comprising:
a power factor improvement circuit which converts an AC power supply to DC, and improves a power factor,
an input detector which detects input from the AC power supply to the power feeding device,
a smoothing capacitor connected to an output end of the power factor improvement circuit,
an inverter circuit which includes a plurality of switching elements, and generates an AC signal by switching each of the switching elements using a voltage of the smoothing capacitor as a power supply,
a power feeding section which includes a resonant capacitor and a first inductor connected to an output end of the inverter circuit, and feeds power generated between the first inductor and a second inductor provided in the power receiving device to the power receiving device based on the AC signal, and
a control circuit which modulates a duty factor of each of the switching elements of the inverter circuit in synchronization with the AC power supply at an amount of modulation determined based on the input from the AC power supply to the power feeding device detected by the input detector, when the power feeding section feeds the power to the power receiving device,
wherein the control circuit modulates the duty factor in a substantially sinusoidal wave pattern at a frequency twice a frequency of the AC power supply.