Texas Instruments Corporation

Nariaki Ogasawara

Toru Tanaka

Kazuya Omagari

Akio Ogura

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 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.

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Yokohama, Japan

Nariaki Ogasawara