Texas Instruments Corporation

Ricoh Company, Ltd.

Kazuya Omagari

Toru Tanaka

Nariaki Ogasawara

Akio Ogura

Masaki Mori

A voltage sensing device with which high-precision voltage sensing is possible without acquiring a unique correction constant for each device. A pair of voltage input nodes NCk and NCk-are selected from n+1 voltage input nodes NC-NCn in switch part, and the selected voltage input nodes NCk and NCk-are connected to inspection input nodes NA and NB. Here, voltage input nodes NCk and NCk-and inspection input nodes NA and NB are connected in two types of patterns of different polarity (forward connection, reverse connection) under the control of control part, and digital data Sfor the two sensed voltage signals Sgenerated in the two types of connection patterns is input to sensed data processing part. With sensed data processing part, sensed voltage data Sthat represents the potential difference between voltage input nodes NCk and NCk-is generated according to the difference in the two sensed voltage signals S

Voltage sensing device

A circuit for detecting battery cell abnormalities in a multi-cell series battery for effectively and quickly detecting abnormalities with a simple, small circuit that provides improved reliability, safety and service life of the multi-cell series battery. In the voltage monitoring device, immediately after the start of the monitoring cycle of any battery cell BT, cell voltage abnormality detectorchecks whether cell voltage Vis outside of the normal operating range. The cell voltage abnormality detectorhas: a group of selection switchesfor selecting any battery cell BT of multi-cell series batteryand retrieving its voltage to first and second monitoring terminals A, B; cell voltage/monitoring current converter; monitoring current/monitoring voltage converter; comparison/evaluation circuit; evaluation signal output circuitand abnormality detection controller

Cell voltage abnormality detector and cell voltage monitoring device for a multi-cell series battery

A voltage sensing device with which high-precision voltage sensing is possible without the need to obtain a unique correction constant for each device. A pair of voltage input nodes NCk and NCk-is selected from voltage input nodes NC-NCn in switch part, and they are connected to sensing input nodes NA and NB in two types of patterns with different polarity (forward connection, reverse connection). Sensing input nodes NA and NB are held at reference potential Vm by voltage sensing part, and current Ina and Inb corresponding to the voltage at voltage input nodes NCk and NCk-flows to input resistors RIk and RIk-. Currents Ina and Inb are synthesized at different ratios in voltage sensing part, and sensed voltage signal Sis generated according to the synthesized current Ic. Sensed voltage data Swith low error is generated according to the difference between the two sensed voltage signals Sgenerated in the two connection patterns.

Voltage sensing device for an individual cell of a group of battery cells

A magnetic sensor circuit supplying an excitation current to an MI device, and having a detection signal supplied thereto corresponding to a magnetic field intensity from the MI device based on the excitation current. The magnetic sensor circuit includes a pulse current supplying circuit supplying a pulse current to the MI device; a sample-and-hold circuit maintaining an approximately peak value of the detection signal and outputting a hold signal; and a temperature compensation part compensating temperature characteristics of the magnetic sensor circuit with respect to the hold signal. The sample-and-hold circuit may include a switching circuit and a holding capacitor. The switching circuit may have an opening/closing control signal supplied thereto based on timing of the pulse current. The temperature compensation part may include a temperature detection circuit, a temperature compensation circuit, and an amplification circuit that has an amplification factor higher than that of the temperature compensation circuit.

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Tokyo, Japan

Kazuya Omagari