Circuit protection device and voltage detection device
A circuit protection device is provided between a direct-current power supply and a protection object circuit connected to the direct-current power supply, and protects the protection object circuit from an overvoltage of the direct-current power supply by shutting off a connection between the direct-current power supply and the protection object circuit using a predetermined interrupting element. The circuit protection device includes a bypass circuit which suppresses an electric alternating-current component from flowing to the interrupting element.
1. A circuit protection device which is provided between a direct-current power supply and a protection object circuit connected to the direct-current power supply, and protects the protection object circuit from an overvoltage of the direct-current power supply by shutting off a connection between the direct-current power supply and the protection object circuit using a predetermined interrupting element, the device comprising:
a bypass circuit which suppresses an electric alternating-current component from flowing to the interrupting element, wherein:
the direct-current power supply is a battery pack in which a plurality of battery cells are connected in series;
the interrupting element is provided for each electrode of the plurality of battery cells;
the bypass circuit is a capacitor with one end thereof connected to an input end of the interrupting element; and
the capacitor is provided to connect input ends of the adjacent interrupting elements.
2. The circuit protection device according to claim 1 , wherein the capacitor is provided to correspond to every other one of adjacent battery cells.
3. A voltage detection device comprising:
the circuit protection device according to claim 1 ; and
a voltage detection circuit which is the protection object circuit and detects a voltage of the direct-current power supply.