| 摘要 |
<p>The present invention accurately detects the voltage of a battery while using an inexpensive resistor of which the precision can be maintained at a high level even while a discharge switch (12) is on. In a power source device, discharge circuits (2), a discharge control circuit (3), resistance voltage divider circuits (4), cell voltage detection circuits (5), and a failure determination circuit (6) are provided to batteries (1) constituting an assembled battery (10) in which multiple batteries are connected in series, wherein: the discharge circuits (2) are formed from a series circuit of the discharge switch (12) and a discharge resistor (11) which are connected in parallel with a voltage detection line (9) therebetween; the discharge control circuit (3) controls the discharge switch (12) of the discharge circuit (2) and equalizes the voltage of the batteries; the resistance voltage divider circuits (4) are formed from a series circuit of voltage-dividing resistors (4A, 4B) connected in parallel with the discharge resistor (11) of the discharge circuit (2); the cell voltage detection circuits (5) detect the voltage of the respective battery (1) from the voltage that was divided by means of the respective resistance voltage divider circuit (4); and the failure determination circuit (6) determines a failure from the voltage detected by means of the cell voltage detection circuits (5). The failure determination circuit (6) determines the failure of the voltage detection line (9) and the discharge circuit (2) from the detection voltage detected by means of the cell voltage detection circuits (5) when the discharge switch (12) is on and off.</p> |
