Liquid level detection device
AssigneeYazaki Corporation
InventorsYasunori Kawaguchi, Kenichi Tanaka, Toshio Oike
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Abstract
A liquid level detection device includes a sensor provided in a container which stores a liquid therein and having a variable resistance which changes a resistance value in association with a change of liquid level to output a voltage signal according to the resistance value of the variable resistance when a voltage is applied thereto, and a power supply circuit applying the voltage to the sensor intermittently on a predetermined cycle. A conducting time during which the power supply circuit applies the voltage to the sensor is equal to or less than 40 ms per cycle.
Claims3
A liquid level detection device comprising:
- a sensor provided in a container which stores a liquid therein and having a variable resistance which changes a resistance value in association with a change of liquid level to output a voltage signal according to the resistance value of the variable resistance when a voltage is applied to the sensor;
- and
- a power supply circuit applying the voltage to the sensor intermittently on a predetermined cycle,
- wherein a conducting time during which the power supply circuit applies the voltage to the sensor is equal to or less than 15ms per cycle and greater than 1 ms per cycle, and a ratio of the conducting time in one cycle is 50% or less and is configured to suppress electro chemical reactions.
Dependencies are inferred from the claim text.