On-board device
AssigneesAutonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
InventorsKota Oda, Ryosuke Masuda, Masaya Ina
Life of this patent
Estimating the term…
Abstract
An ECU (on-board device) includes a fuse F1 and a blown fuse detection circuit. The blown fuse detection circuit monitors a fuse voltage between two connection nodes respectively located upstream and downstream of the fuse in a current path of a current flowing from a positive electrode of a DC power supply through the fuse. The blown fuse detection circuit outputs a voltage lower than a reference voltage if the fuse voltage is lower than a voltage threshold value. The blown fuse detection circuit outputs a voltage higher than or equal to the reference voltage if the fuse voltage is higher than or equal to the voltage threshold value.
Claims10
An on-board device comprising:
- a fuse;
- and
- a blown fuse detection circuit configured to detect that the fuse has blown, the blown fuse detection circuit includes a circuit switch provided on a second current path of a current flowing from a connection node located upstream of the fuse in the current path;
- and a circuit resistor provided downstream of the circuit switch in the second current path, wherein the circuit switch is configured to switch from off to on when the fuse voltage increases to a voltage higher than or equal to the voltage threshold value;
- and
- wherein the blown fuse detection circuit is configured to:
- monitor a fuse voltage between two connection nodes respectively located upstream and downstream of the fuse in a current path of a current flowing from a positive electrode of a DC power supply through the fuse;
- output a voltage lower than a reference voltage if the fuse voltage is lower than a voltage threshold value;
- and
- output a voltage higher than or equal to the reference voltage if the fuse voltage is higher than or equal to the voltage threshold value, and a voltage at an upstream end of the circuit resistor is output from the blown fuse detection circuit.
Dependencies are inferred from the claim text.