Power feed device of inductive charging device

• US 9,755,500 B2
• Filed: 08/19/2014
• Issued: 09/05/2017
• Est. Priority Date: 03/15/2012
• Status: Active Grant

• Current Assignee: Panasonic Automotive Systems Company of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Sadakata, Hideki, Fujita, Atsushi, Kashimoto, Takashi, Bessyo, Daisuke
• Primary Examiner(s): Amrany, Adi
• Application Number:
  US14/463,381
• Publication Number:
  US 20140354073A1
• Time in Patent Office: 1,113 Days
• Field of Search: 307104, 363 98, 363 17, 323205
• 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,

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.