| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple circuit configuration for detecting voltages of electric cells constituting a battery pack. SOLUTION: The voltage detection system for a battery pack wherein capacitors 2a, 2b, 2c and 2d are connected in parallel with the respective electric cells 1a, 1b, 1c and 1d of a battery pack 1, in which a plurality of electric cells are connected in series and the voltage of each of the capacitors is detected, by sequentially inputting it into a voltage detection element SD which comprises capacitor-side switching units 5a, 5b, 5c and 5d; and a switching unit for ground connection that switch whether the high potential side of each capacitor is connected to an input terminal of the voltage detection element SD or is connected to the ground side so as to sequentially input a voltage of each capacitor into the voltage detection element SD, wherein the switching unit for ground connection is configured by using a signal output circuit of a switch control element that controls the switching of the capacitor side switch unit by configuring the capacitor-side switch unit with an N-channel junction type FET 21. COPYRIGHT: (C)2008,JPO&INPIT |
