Relay drive unit
AssigneeDenso Corporation
InventorsRyo Adachi, Akito Itou, Katsumi Matsuo, Tsuneyoshi Isozaki
Life of this patent
Estimating the term…
Abstract
A relay drive unit drives a relay by supplying a power source voltage from a battery. The relay drive unit includes a power source voltage detector, a drive signal generator, and a relay drive circuit. The power source voltage detector detects the power source voltage. The drive signal generator generates a PWM signal as a drive signal for maintaining the relay in an ON state. The PWM signal has a preset duty ratio according to a magnitude of the power source voltage detected by the power source voltage detector. The relay drive circuit turns a supply of the power source voltage from the battery on/off based on a duty ratio of the drive signal generated by the drive signal generator.
Claims3
A relay drive unit for driving a relay by supplying a power source voltage from a battery, the relay drive unit comprising:
- a power source voltage detector detecting the power source voltage;
- a drive signal generator generating a drive signal;
- and
- a relay drive circuit turning a supply of the power source voltage from the battery on or off based on a duty ratio of the drive signal generated by the drive signal generator, wherein
- the drive signal generator generates a PWM signal as the drive signal for maintaining the relay in an ON state, of which the drive signal having a preset duty ratio according to a magnitude of the power source voltage detected by the power source voltage detector, and
- the duty ratio of the drive signal is adjusted so that an electric power consumption amount is reduced according to a value of the power source voltage.
Dependencies are inferred from the claim text.