Voltage detecting device
View Patent ↗A voltage detecting device includes a voltage detecting circuit configured to detect voltages of a plurality of battery cells constituting a battery; a plurality of voltage detecting lines connecting the respective battery cells to the voltage detecting circuit; discharging circuits connecting the respective voltage detecting lines to a ground, and discharging the battery cells in an overcharged state; a power adjusting section adjusting power of the battery, and supplying the voltage detecting circuit with the adjusted power as driving power; the voltage detecting circuit detecting the voltages of the respective battery cells via the voltage detecting lines; and an overvoltage protecting circuit protecting the voltage detecting circuit from voltage equal to or higher than a predetermined threshold value, the voltage being generated in the voltage detecting lines, the discharging circuits, and the power adjusting section.
1. A voltage detecting device comprising:
a voltage detecting circuit configured to detect voltages of a plurality of battery cells constituting a battery;
a plurality of voltage detecting lines connecting the respective battery cells to the voltage detecting circuit;
discharging circuits connecting the respective voltage detecting lines to a ground, and discharging the battery cells in an overcharged state;
a power adjusting section adjusting power of the battery, and supplying the voltage detecting circuit with the adjusted power as driving power;
the voltage detecting circuit detecting the voltages of the respective battery cells via the voltage detecting lines; and
an overvoltage protecting circuit protecting the voltage detecting circuit from voltage equal to or higher than a predetermined threshold value, the voltage being generated in the voltage detecting lines, the discharging circuits, and the power adjusting section,
wherein the overvoltage protecting circuit comprises:
a Zener diode through which a current flows when a voltage equal to or higher than the predetermined threshold value is applied to the Zener diode;
a switching element having three terminals, a control terminal of the three terminals being connected to an anode terminal of the Zener diode, a first terminal of the two remaining terminals being connected to a cathode terminal of the Zener diode, and a second terminal being connected to the ground;
a resistor configured to adjust a current input to the control terminal of the switching element, the resistor having a first terminal connected to the anode terminal of the Zener diode, and having a second terminal connected to the ground;
a plurality of first diodes provided for the respective voltage detecting lines, the plurality of first diodes each having an anode terminal connected to a corresponding voltage detecting line, and having a cathode terminal connected to the cathode terminal of the Zener diode;
a plurality of second diodes provided for the respective discharging circuits, the plurality of second diodes each having an anode terminal connected to a corresponding discharging circuit, and having a cathode terminal connected to the cathode terminal of the Zener diode; and
a third diode having an anode terminal connected to the power adjusting section, and having a cathode terminal connected to the cathode terminal of the Zener diode.