Panasonic Intellectual Property Management Co., Ltd.

Matsushita Electric Works, Ltd.

Panasonic Corporation

Panasonic Electric Works Co., Ltd.

Seiichi Iwao

Yasuo Ibuki

Mikihiro Yamashita

Hiroyasu Kitamura

Norihiro Iwamura

Yoshinori Katsura

Tomohiro Ota

Tadanobu Kitagawa

Shinji Nishimura

Koji Asakawa

Mami Tsutsui

Kazunori Watanabe

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

An electric apparatus unit comprises electric apparatus and charging stand. Electric apparatus includes rechargeable battery, a driver that drives through electric power supplied from rechargeable battery and power receiver that supplies the electric power to rechargeable battery. Charging stand includes power transmission coil that supplies electric power to power receiver and support that supports electric apparatus.

Electric apparatus unit

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

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

The present invention is to provide a switching power supply device for preventing the change of characteristic of the line filter due to filler such as resin which covers the circuits. A switching power supply device is disclosed which comprise a rectifierfor full wave rectification of the input of the utility power supply, a condenserfor smoothing the output of the rectifier, a line filterconsisting of a first coilwhich is connected in series to a high voltage side output of the rectifierand a second coilwhich is connected in series to a low voltage side output of the rectifiervia the condenser, a condenserfor smoothing the output of the line filter, a series circuit of a primary windingof a transformerwhich is connected in parallel to the condenserand a switching element, a diodefor half-wave rectification of the output of a secondary windingof the transformer, and a condenserconnected between output terminals of the secondary windingvia the diode, wherein a diodeis connected in a forward direction from an input of the second coilof the line filterto an output of the first coilof the line filter

Switching power supply with novel common mode filter arrangement

A non-contact transformer includes a transformer component provided on the floor of a housing, a printed circuit board on the transformer component, and an empty core space is formed within the transformer component wherein deformation of the housing is prevented through a construction that evacuates residual air from the core space when the core space is filled with resin even though both ends of the core space are covered by lid-like parts. A cylindrical end face at one extremity of the primary transformer component is positioned on the bottom plate of the primary housing opposed to the secondary housing, and the printed circuit board is provided on an opposite cylindrical end face which is at the other extremity of the primary transformer component. A passage is formed between the printed circuit board and the primary transformer component to provide a connecting orifice between a core space of primary transformer component and the space external to the primary transformer component.

Growing community of inventors

Inukami, Japan

Seiichi Iwao