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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsKatsuhiko Furukawa, Keisuke Urushihara, Yuuichi Nakamura
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An automotive electric power unit is provided to reduce the occurrence of electromagnetic noise caused by change in magnetic fields when the current dropps to zero when an ignition switch is being switched off. When the ignition switch is switched off, an input voltage to an ON/OFF control terminal of a DC/DC converter gently decreases through a potential difference between terminals of a motor driving load connected thereto. Accordingly, a control device, for which a detecting voltage is set relatively high, first detects an OFF state of the ignition switch and disconnects power loads such as a cooling fan, air conditioner, and defroster from the DC/DC converter by regulating relays. Then, the DC/DC converter, for which a detecting voltage is set lower than the detecting voltage for the control device, detects the OFF state of the ignition switch and stops stepping down the voltage so that a charging current for a battery of the load current thereof is shut off.
An automotive electric power unit having a first charging device, a second charging device charged by applying voltage which is stepped down from the electric energy accumulated in the first charging device by a DC/DC converter, and a control device controlling a plurality of power loads connected to the second charging device, wherein the control device first shuts down the power loads and subsequently allows the DC/DC converter stop stepping down the voltage, upon an ignition switch for actuating the vehicle being switched off.
An automotive electric power unit having a first charging device, a second charging device charged by applying voltage which is stepped down from the electric energy accumulated in the first charging device by a DC/DC converter, and a control device controlling a plurality of power loads connected to the second charging device, wherein the control device first allows the DC/DC converter decrease its stepped down output voltage and subsequently shuts down the power loads after the output voltage being decreased, upon an ignition switch for actuating the vehicle being switched off.
Dependencies are inferred from the claim text.