POWER FEED DEVICE OF INDUCTIVE CHARGING DEVICE

• US 20140354073A1
• Filed: 08/19/2014
• Published: 12/04/2014
• Est. Priority Date: 03/15/2012
• Status: Active Grant

• Current Assignee: Panasonic Automotive Systems Company of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: SADAKATA, Hideki, FUJITA, Atsushi, KASHIMOTO, Takashi, BESSYO, Daisuke
• Granted Patent: US 9,755,500 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 1/14 Arrangements for reducing ripples from dc input or output
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33573 Full-bridge at primary side of an isolation transformer
• CPC Class Codes: H04B 5/00 Near-field transmission systems, e.g. inductive or capacitive transmission systems
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

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.

Claims

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,

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 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 when the power feeding section feeds the power to the power receiving device.

2. The power feeding device of the non-contact charging device of claim 1, wherein

the control circuit increases an amount of modulation of the at least one of the duty factor or the operation frequency of the plurality of switching elements with increase in input from the AC power supply to the power feeding device.

3. The power feeding device of the non-contact charging device of claim 1, wherein

the control circuit modulates the at least one of the duty factor or the operation frequency in a substantially sinusoidal wave pattern at a frequency twice a frequency of the AC power supply.