Tdk Corporation

Tdk-lambda Corporation

Tadao Senriuchi

Hiroshi Nakazawa

Masahiko Hirokawa

Takumi Sakamoto

Noriyuki Hirao

Masahide Ohnishi

Sadaharu Yoneda

Takeo Gokita

Kazutaka Tamaki

Provided is a measuring device capable of enhancing convenience. The measuring devicecomprises a first sensorprovided on a surface of an objectto be measured, an elastic bodythat clamps the first sensorbetween the elastic bodyand the objectto be measured, a protective sheetprovided on the surface of the elastic bodyon the side of the objectto be measured, a caseprovided on the surface of the elastic bodyon a side opposite from the objectto be measured, and a processing circuitwhich is provided inside the caseand processes an output signal from the first sensor. The first sensoris provided between the elastic bodyand the protective sheet. The first sensoris a strain sensor and includes a thin film piezoelectric element. The elastic bodyis made of foamed rubber.

Measuring device and measuring system

A wireless power receiving device includes a voltage detection unit that detects an output voltage value of a rectifying unit, a power reduction unit that includes a switching element connected to a charging unit in parallel, and a control unit that controls operations of the switching element. In a case where the output voltage value detected by the voltage detection unit exceeds a first reference voltage value set in advance, the control unit controls and turns the switching element on by applying a voltage to the switching element, and controls the value of the voltage to be applied to the switching element so that the difference between the voltage value calculated on the basis of a current flowing in the switching element and a second reference voltage value set in advance decreases.

Wireless power receiving device and wireless power transmission device

A number of cells can be determined before control for a battery without providing cell number setting and input means. The cell number determination device comprises voltage measuring units that select an 'i'th cell among cells that are connected in series and that configure a battery, and that measure a voltage value between a terminal in which the 'i'th cell and an (i&#x2212;1)th cell, which is in one location higher than the &#x201c;i&#x201d;th cell, are connected and a ground potential line, voltage comparators that determine an existence, nonexistence or normality of the cells by comparing a voltage value of an (i+1)th cell that is in one location lower than the &#x201c;i&#x201d;th cell with the voltage value of the &#x201c;i&#x201d;th cell measured by the voltage measuring units and a cell number determination unit that determines a number of assembled cells and normal cells and cell assembled locations in the battery.

Method for determining cell number, cell number determination device, power supply device and program

A reusable period of a battery can be maintained for a long time by recharging while avoiding abnormal heating of the battery due to over discharge. A battery protection circuit comprises a control part that cuts off a discharge switch which is a discharge path to a load for a battery when a voltage value of the battery is equal to or less than a first threshold value, or when the voltage value of the battery is less than the first threshold value, wherein the control part cuts off a power switch as a power supply path to the control part itself when the voltage value of the battery is equal to or less than a second threshold value, or when the voltage value of the battery is less than the second threshold value which is lower than the first threshold value.

Battery protection circuit, method for protecting battery, power supply device and program

A power supply control device for controlling power supply to a pair of terminals to which a load is connected, comprising a voltage measuring part for measuring a voltage which has a predetermined relationship with the voltage of the pair of terminals, a short circuit detecting part for detecting whether a short circuit exists between the pair of terminals based on the measured voltage and for making power supply to the pair of terminals stop when existence of a short circuit is detected, and a constant current supplying part for supplying a constant current though the pair of terminals; wherein the short circuit detecting part is configured to detect that the previously detected short circuit is eliminated when the voltage measured by the voltage measuring part is equal to or greater than a predetermined threshold value upon supplying the constant current through the pair of terminals.

Power supply control device, method for controlling power supply, program and power supply device

A temperature detection circuit includes a temperature dependent voltage generation circuit for generating a temperature dependent voltage VR, a bandgap circuit for generating a temperature independent voltage VBG, and a comparator for comparing the temperature dependent voltage VR generated in the temperature dependent voltage generation circuit with the temperature independent voltage VBG generated in the bandgap circuit, and based on the above comparison result, outputting a temperature detection signal which indicates the high-low relationship between the temperature dependent voltage VR and the temperature independent voltage VBG. The above bandgap circuit includes an N-channel transistor source of which is connected to an input terminal of the comparator and supplies a current having a positive temperature characteristic, and an amplifier for driving gate of the N-channel transistor so that the source potential of the N-channel transistor is made to have a constant potential independent of the temperature of the measurement object.

Growing community of inventors

Tokyo, Japan

Tadao Senriuchi