Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Electric Works Co., Ltd.

Matsushita Electric Works, Ltd.

Hiroyasu Kitamura

Seiichi Iwao

Mikihiro Yamashita

Norihiro Iwamura

Mami Tsutsui

Hideaki Abe

Satoru Inakagata

Tomohiro Ota

Atsushi Isaka

Kyohei Kada

Masayuki Suzuki

Tatsuhiko Keishu

A power transmission device for a noncontact power supply device includes a resonant circuit that outputs an alternating magnetic flux by power from a power source circuit, and switching elements for making the resonant circuit generate an alternating magnetic flux, and transmits power to a power receiving coil of a power reception device by the alternating magnetic flux. A power transmission controller of the power transmission device includes a transmission mode of supplying alternating power to the resonant circuit by repeating ON and OFF of switching elements by controlling switching elements. ON time in one cycle of operation of each of switching elements used in the transmission mode is a first fixed value. Accordingly, the power transmission device in a simplified configuration can be provided.

Power transmission device for noncontact power supply device

A noncontact power supply device includes a power transmission device, a magnetism collecting device, and a power reception device. The power transmission device includes switching elements that make a power-transmission resonant circuit generate an alternating magnetic flux from a power source circuit. The power reception device includes a magnetism collecting device having a magnetism collecting circuit not connected to a load, a power receiving coil which is capable of being magnetically coupled to the magnetism collecting device, and a rectifier circuit that supplies output power of the power receiving coil to a load. A power-transmission resonance frequency of the power-transmission resonant circuit is smaller than a drive frequency of each of switching elements, and a power-reception resonance frequency of the magnetism collecting circuit is larger than the drive frequency of each of switching elements. Accordingly, the present invention provides a noncontact power supply device with high power transmission efficiency and with excellent productivity.

Non-contact power supply device

According to a first aspect, a secondary side of contactless power transmission apparatus includes: a holding member which is physically separated from a primary side; a magnetic layer; a shield layer for shielding electromagnetic noise; and a heat insulation layer. The secondary coil is a planar coil and supported by the holding member, and at least the magnetic layer is laminated on one side of the planar coil and unified with the planar coil. According to a second aspect, the secondary side of the apparatus includes a plurality of magnetic layers. Each permeability of the magnetic layers is different from each other, and each of the magnetic layers forms a magnetic path with the primary side.

Contactless power transmission apparatus and a method of manufacturing a secondary side thereof

A driving circuit drives a switching element such that an ON-period of the switching element is shorter when a power receiving device is detected not to be placed than when the power receiving device is placed.

Contactless power transmission circuit

Power saving is promoted by oscillating only power transmission coil contributing to contactless charging without using any communication means.

Contactless power transmission system

To provide a power supply circuit which can be applied worldwide without using a high withstand voltage switching element and can supply a load device with stable power. A charging section is arranged between a turn-off capacitor and a load coil. The charging section has the anode connected to the positive terminal of a feedback coil and the cathode connected to the cathode of a zener diode. Thus, when a voltage of a commercial power supply is high, the charging section operates, the turn-off capacitor is quickly charged, an on-period of a transistor is shortened, and an excessive voltage is prevented from being applied between the drain and the source of the transistor. At the same time, an output characteristic indicating relationship between the voltage of the commercial power supply and a current flowing in the load device is permitted to be flat.

Power supply circuit and power supply system

An electrical apparatus system includes a depilator (first electrical apparatus) that depilates body hair, a cleaning apparatus (second electrical apparatus) that cleans the depilatory and an AC adapter that supplies DC electric power to the depilator or the cleaning apparatus. Electric power can be supplied between both the electrical apparatuses by bringing a back surface terminal provided in the depilator and a connection terminal provided in the cleaning apparatus into contact with each other.

Electrical apparatus system

A power supply system is capable of feeding electric power from a power adapter to a plurality of load devices. The power adapter includes a primary core; and a primary coil wound around the primary core for serving as a output port of the power adapter to output an alternating current. The load devices include secondary cores for simultaneously forming magnetic circuits between the primary core and the load devices; and secondary coils wound around the secondary cores for feeding output power to the load devices. The primary core has two pairs of protrusions, and the secondary cores are arranged on opposite sides of the primary core in such a manner that the primary core lies between the secondary cores to feed electric power simultaneously to the load devices.

Growing community of inventors

Hirakata, Japan

Hiroyasu Kitamura