Voltage measuring device
AssigneeHonda Motor Co., Ltd.
InventorYasumichi Ohnuki
Life of this patent
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Abstract
Provided is a voltage measuring device capable of increasing the degree of freedom in the design of an RC filter (low-pass filter) while suppressing the withstand voltage limit of a capacitor. The voltage measuring device comprises: at least one divided capacitor group having a plurality of divided capacitors connected in series through measurement nodes and having one end connected to a reference node and the other end connected to a non-reference node; and at least one non-divided capacitor having one end connected to the reference node and the other end connected to a non-reference node to which the divided capacitors are not connected.
Claims4
A voltage measuring device for measuring a voltage across a battery assembly having a plurality of series-connected battery modules each of which is made up of at least one cell, comprising:
- a plurality of measurement nodes including at least one reference node, which is maintained at a reference potential and is connected to one of the battery modules without being connected thereto through a resistor, and non-reference nodes other than the reference node;
- a plurality of voltage detector sections connected between adjacent ones of the measurement nodes in terms of potential magnitudes;
- a plurality of resistors having respective ends connected to the non-reference nodes and respective other ends connected to junctions between the battery modules or to opposite ends of the battery assembly;
- at least one dividing capacitor group having a plurality of dividing capacitors connected in series through the measurement nodes, and having an end connected to the reference node and another end connected to one of the non-reference nodes;
- and
- at least one non-dividing capacitor having an end connected to the reference node and another end connected to one of the non-reference nodes to which the dividing capacitors are not connected.
A voltage measuring device for measuring a voltage across a battery assembly having a module array made up of a plurality of series-connected battery modules each of which is made up of at least one cell, comprising:
- a voltage detecting unit for detecting voltages across the battery modules, the voltage detecting unit being connected to positive and negative pole sides of the battery modules through at least as many lines as number of the battery modules +1, the lines being connected to junctions between the battery modules and opposite ends of the module array;
- as many resistors as the number of the battery modules, the resistors being connected to as many lines as the number of the battery modules, among the at least as many lines as the number of the battery modules +1;
- and
- as many capacitors as the number of the battery modules, which are combined with the resistors to make up RC filters;
- wherein the capacitors include at least one first capacitor not connected in series to other capacitors, and a plurality of second capacitors connected in series to the other capacitors, the second capacitors being combined into at least one series-connected capacitor group;
- the first capacitor has an end connected through one of the lines to a particular pole side as a positive or negative pole side of the battery modules;
- the first capacitor has another end connected to a reference line as one of the lines, which is free of any of the resistors;
- the second capacitors have ends connected to particular pole sides or to opposite sides of the battery modules through certain ones of the lines;
- and
- one of the second capacitors, which is closest to the reference line, of said at least one series-connected capacitor group has another end connected to the reference line, and the others of the second capacitors have other ends, which are connected to the ends of the second capacitors on non-reference lines apart from the reference line.
Dependencies are inferred from the claim text.