Leak detecting circuit for power source device
First Claim
1. A leak detecting circuit for a power source device having a cell unit comprising a plurality of cells connected in series, wherein a pair of positive and negative power lines extending from respective opposite electrodes of the cell unit are connected to each other by four voltage dividing resistors (R1A, R1B, R2A, R2B) connected to one another in series, a midpoint between the two voltage dividing resistors (R1A, R1B) arranged on the positive power line side and the two voltage dividing resistors (R2A, R2B) arranged on the negative power line side being grounded, and the potential difference between the positive power line and the midpoint between the two voltage dividing resistors (R1A, R1B) on the positive side and the potential difference between the negative power line and the midpoint between the two voltage dividing resistors (R2A, R2B) on the negative side are compared with respective reference voltages to detect a leak.
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Accused Products
Abstract
In a power source device having a cell unit, a leak detecting circuit in which a line P and a line N extending from the cell are connected to each other by two P-side voltage dividing resistors and two N-side voltage dividing resistors, and the midpoint between the P-side resistors and N-side resistors is grounded. The line P and the line N are also connected to each other by first to third auxiliary voltage dividing resistors. The midpoint between the first and second auxiliary resistors and the midpoint between the P-side first and second resistors are connected to each other by a P-side voltage comparison circuit. The midpoint between the second and third auxiliary resistors and the midpoint between the N-side first and second resistors are connected to each other by an N-side voltage comparison circuit.
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Citations
5 Claims
- 1. A leak detecting circuit for a power source device having a cell unit comprising a plurality of cells connected in series, wherein a pair of positive and negative power lines extending from respective opposite electrodes of the cell unit are connected to each other by four voltage dividing resistors (R1A, R1B, R2A, R2B) connected to one another in series, a midpoint between the two voltage dividing resistors (R1A, R1B) arranged on the positive power line side and the two voltage dividing resistors (R2A, R2B) arranged on the negative power line side being grounded, and the potential difference between the positive power line and the midpoint between the two voltage dividing resistors (R1A, R1B) on the positive side and the potential difference between the negative power line and the midpoint between the two voltage dividing resistors (R2A, R2B) on the negative side are compared with respective reference voltages to detect a leak.
Specification