| 摘要 |
A detection part (B), of a disconnection detection apparatus ( 1 A), detects an open destruction of a detection resistor. An emitter of a transistor (Q 5 ) is connected to an upstream end of a detection resistor (R 1 ) through a diode (connected forward) (D 2 ). A base of the transistor (Q 5 ) is connected to a downstream end of the detection resistor (R 1 ) through a resistor (R 8 ). A collector of the transistor (Q 5 ) is connected to an upstream side of a resistor (R 4 ) of a determination part ( 3 ). In the detection part (B), the transistor (Q 5 ) is turned on and off according to the difference in the potential between both ends of the detection resistor (R 1 ). In an open destruction detection state, generated when the transistor (Q 5 ) is ON, electric current supplied by the power supply 4 is fed to the determination part ( 3 ) through the transistor (Q 5 ) as a detection result indicating that an open destruction has occurred.
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