Patent ID: 6956377

Claim:
A disconnection detection apparatus comprising: a first detection resistance connectedly mounted on a first feeding path extending from a power supply to a first load; a first detection part “couple across the first detection resistance, and operable to detect” a disconnection of said first feeding path according to a decrease of a voltage drop at said first detection resistance in comparison with a voltage drop said first detection resistance in a normal operation; a second detection part coupled across the first detection resistance and operable to detect an open circuit across the first detection resistance according to an increase of said voltage drop at said first detection resistance in comparison with said voltage drop said first detection resistance in a normal operation; a warning lamp; a first control part for controlling lighting of said warning lamp by a first predetermined lighting operation when said first detection part detects said disconnection; and a second control part for controlling lighting of said warning lamp by a second predetermined lighting operation when said second detection part detects said open destruction; the first or second predetermined lighting operation including turning on the warning lamp when a switch of the first load is in a closed state and turning off the warning lamp when the switch of the first load is in an open state.