Taiyo Yuden Co., Ltd.

Mitsuaki Ootani

Yasuo Hosaka

Yoshiyuki Wasada

Yuji Ebinuma

Takeshi Nakayama

Takayuki Tsukamoto

Nobuyuki Yamazaki

Junichi Shimamura

Yasushi Inoue

Kiichi Kikuchi

Kenji Kaneta

Hajime Hasegawa

If an input voltage to an output control device is above a lower limit value, the output control device operates in a constant voltage control mode for maintaining an output voltage at a substantially constant voltage. If the input voltage of the output control device falls below the lower limit value, the output voltage is controlled to be lower than the constant voltage in the constant voltage control mode, and the output control device operates in a lower limit value sustaining mode for maintaining the input voltage at the lower limit value. Then, the output control device shifts to a current increasing mode in which the output current rises as the output voltage falls.

Output regulating device for regulating output of electric power source depending on input therefrom

An FET is connected in parallel to a series circuit of a switching device and an inductor between an input terminal and an output terminal , wherein an output voltage V is dropped only by an operation of the switching device ; the FET is turned on by a driving circuit when the switching device sustains an on duty factor of 100% so that a series resistance of the switching device and the inductor is connected in parallel to an on resistance of the FET , thereby increasing a supply current and extending a period during which an output voltage provided to the output terminal is sustained at a predetermined level. Therefore, a power circuit capable of extending an operating time of a battery-operated power supply, a method for driving same, and further an electronic module implementing same can be obtained.

Battery operated power circuit and driving method thereof

The present invention provides a switching circuit and an electronic switching component having a switching semiconductor device to perform switching between a conducting state and a non-conducting state of a conducting path to thereby reduce the power loss thereof and a control method thereof. In the present invention, at least two FETs and wherein the FET has a faster switching time and the FET has a lower ON resistance. Active terminals (drains and sources) of the FETs and are connected to each other in parallel. By employing these FETs and the conversion between an ON-state and an OFF-state of the conducting path is performed. In converting from the non-conducting state to the conducting state, the control circuit first turns on the FET and then turns on the FET when if a voltage between terminals of the FET reaches around a saturation value thereof. In converting from the conducting state to the non-conducting state, the control circuit first turns off the FET and then turns off the FET when if a voltage between terminals of the FET reaches around a saturation value thereof.

Switching circuit having a switching semiconductor device and control method thereof

The present invention provides a multilayered electronic component (,) having improved thermolytic effect for an electronic circuit module (,), facilitating the realization of a miniaturization of the electronic circuit module (,). The multilayered electronic component (,) is provided with a first surface (,), a second opposite surface and side surfaces. A heat dissipation pattern (,) is formed in the multilayered electronic component (,) in a vicinity of the first surface (,) thereof on which a plurality of lands (,) is formed, in such a way that at least one land (,) is electrically connected to the heat dissipation pattern (,). A semiconductor chip (,) is mounted on the first surface (,) of the multilayered electronic component (,), thereby forming the electronic circuit module (,). Heat induced in the semiconductor chip (,) is emitted from the heat dissipation pattern (,), which will, in turn, make a thermolytic effect of the electronic circuit module (,) be improved.

Multilayered electronic part and electronic circuit module including therein the multilayered electronic part

A hybrid integrated circuit device is provided which suppresses lowering of the inductance value of a mounted coil component. A hybrid integrated circuit device according to the present invention has such a structure that a wiring pattern is provided on at least one main face of a substrate, a laid core type coil component is mounted on at least one main surface of the substrate, and a conductor pattern including a ground pattern is provided at least either on a main face opposite to the surface of the substrate upon which the laid core type coil component is mounted or in an interior of the substrate. In particular, the hybrid integrated circuit device has a configuration such that a magnetic flux passing window, having an absence of ground pattern, is provided in an orthographic projection area corresponding to a winding portion of the coil component in the conductor pattern.

Growing community of inventors

Tokyo, Japan

Mitsuaki Ootani