Patent ID: 7126342
Filing Date: 2006-10-24
Classification: G01R

Abstract:
1. A voltage measurement device for dividing a plurality of voltage sources into a plurality of blocks each having at least one voltage source and for measuring voltage of a block, the voltage measurement device comprising: a first group of switches including a first MOSFET of a first conductivity type, which has a first main electrode connected to a first voltage input terminal connected to one terminal of a block and which is turned ON/OFF in correspondence with voltage impressed on a control electrode based on voltage impressed on the first main electrode, and a second MOSFET of the first conductivity type, which has a first main electrode connected to a second voltage input terminal connected to the other terminal of the block and which is turned ON/OFF in correspondence with voltage impressed on a control electrode based on voltage impressed on the first main electrode; a first storage element provided with respect to each block and also connected between a second main electrode of the first MOSFET of the first conductivity type and a second main electrode of the second MOSFET of the first conductivity type; a second group of switches including a first MOSFET of a second conductivity type opposed to the first conductivity type, which has a second main electrode connected to one terminal of the first storage element and a first main electrode connected to a first voltage output terminal and which is turned ON/OFF in correspondence with a signal inputted to a control electrode, and a second MOSFET of the second conductivity type, which has a second main electrode connected to the other terminal of the first storage element and a first main electrode connected to a second voltage output terminal and which is turned ON/OFF in correspondence with a signal inputted to a control electrode; a third group of switches including a third MOSFET of the second conductivity type, which has a second main electrode connected to the control electrode of the first MOSFET of the first conductivity type and which is turned ON/OFF in correspondence with a signal inputted to a control electrode and a fourth MOSFET of the second conductivity type, which has a second main electrode connected to the control electrode of the second MOSFET of the first conductivity type and which is turned ON/OFF in correspondence with a signal inputted to a control electrode; and control means for turning on the first group of switches by turning on the third group of switches and for turning on the second group of switches while the first group of switches is turned off by turning off the third group of switches.