Voltage sensing device
First Claim
1. A voltage sensing device that comprising:
- multiple voltage input nodes;
a pair of sense input nodes;
a switch part provided with multiple switches that turn connections between the voltage input nodes and the pair of sense input nodes on or off;
a first sensed signal generating part that amplifies the voltage input to each of the pair of sense input nodes with a different gain and generates a first sensed signal according to a sum of or difference between amplification results;
a control part that controls the switch part so that a pair of voltage input nodes is selected from the multiple voltage input nodes, and said selected pair of voltage input nodes and the pair of sense input nodes are connected in two patterns of different polarity; and
a second sensed signal generating part that generates a second sensed signal according to the difference between the two first sensed signals generated by the first sensed signal generating part in the two connection patterns.
2 Assignments
0 Petitions
Accused Products
Abstract
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-1 are selected from n+1 voltage input nodes NC0-NCn in switch part 10, and the selected voltage input nodes NCk and NCk-1 are connected to inspection input nodes NA and NB. Here, voltage input nodes NCk and NCk-1 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 50, and digital data S30 for the two sensed voltage signals S20 generated in the two types of connection patterns is input to sensed data processing part 40. With sensed data processing part 40, sensed voltage data S40 that represents the potential difference between voltage input nodes NCk and NCk-1 is generated according to the difference in the two sensed voltage signals S20.
6 Citations
20 Claims
-
1. A voltage sensing device that comprising:
-
multiple voltage input nodes; a pair of sense input nodes; a switch part provided with multiple switches that turn connections between the voltage input nodes and the pair of sense input nodes on or off; a first sensed signal generating part that amplifies the voltage input to each of the pair of sense input nodes with a different gain and generates a first sensed signal according to a sum of or difference between amplification results; a control part that controls the switch part so that a pair of voltage input nodes is selected from the multiple voltage input nodes, and said selected pair of voltage input nodes and the pair of sense input nodes are connected in two patterns of different polarity; and a second sensed signal generating part that generates a second sensed signal according to the difference between the two first sensed signals generated by the first sensed signal generating part in the two connection patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A voltage sensing device that comprises multiple voltage input nodes, each of which is connected to the connection node of multiple cells connected in series, comprising:
-
a first switch circuit for selectively connecting two voltage input nodes, selected from the voltage input nodes, to a first and a second node; a second switch circuit for selectively connecting the first and second nodes to a third and a fourth node, respectively; multiple input resistors, each of which is provided in the multiple current paths formed between the multiple voltage input nodes and the third and fourth nodes; and a voltage sensing circuit connected to the third and fourth nodes for sensing a voltage difference that appears between the third and fourth nodes, wherein the voltage sensing circuit comprises; a first operational amplifier, the negative input terminal of which is connected to the third node, and the positive input terminal of which is connected to a voltage supply terminal; a second operational amplifier, the negative input terminal of which is connected to the fourth node and the positive input terminal of which is connected to the voltage supply terminal; a first resistor connected between the output terminal and the negative input terminal of the first operational amplifier; a second resistor connected between the output terminal and the negative input terminal of the second operational amplifier; and a third resistor connected between the output terminal of the first operational amplifier and the negative input terminal of the second operational amplifier, wherein, in a first state in which one of the two voltage input nodes selected from the multiple voltage input nodes and the first node are connected, and the other of the two selected voltage nodes and the second node are connected; the voltage sensing circuit outputs a first sensed voltage when the first node and third node are connected and the second and fourth nodes are connected; the voltage sensing circuit outputs a second sensed voltage when the first node and the fourth node are connected and the second node and the third node are connected so that a first differential voltage, which is the difference between the first sensed voltage and the second sensed voltage, is generated; and wherein, in a second state in which one the two selected voltage input nodes and the second node are connected, and the other of the two selected voltage input nodes and the first node are connected; the voltage sensing circuit outputs a third sensed voltage when the first node and the third node are connected and the second node and the fourth node are connected; the voltage sensing circuit outputs a fourth sensed voltage when the first node and the fourth node are connected and the second node and the third node are connected, so that a second differential voltage, which is the difference between the third sensed voltage and the fourth sensed voltage, is generated; and inspection of the first switch circuit is performed based on the first and second differential voltages. - View Dependent Claims (19, 20)
-
Specification