Fujitsu Ten Limited

Yuichiro Shimizu

Motoki Komiya

Yoshinori Shibachi

Ryoh Izumoto

Kazuhiro Komatsu

Nobunori Asayama

Tomohide Kasame

Takashi Higuchi

Daisuke Enomoto

Akio Okahara

Yoshikazu Hashimoto

There is provided a power supply circuit. A switching regulator is configured to drop a battery voltage to a first specific voltage. A series regulator includes a switching element and a capacitor connected at an output stage of the switching element. The series regulator is configured to drop the first specific voltage to a second specific voltage and output the second specific voltage. A control circuit is configured to adjust an amount of electric charge to be accumulated in the capacitor according to a voltage value of the first specific voltage.

Power supply circuit

An idling stop device installed in a vehicle includes a microcomputer, a detector, a storage, and a controller. The microcomputer automatically stops an engine of the vehicle when a prescribed stopping condition is satisfied, and automatically activates a starter motor of the engine when a prescribed activating condition is satisfied. The detector detects whether a drive voltage of the microcomputer, which is obtained by dropping a voltage of a battery of the vehicle is less than a threshold value. The storage stores, irrespective of a state of the microcomputer, information indicating that the detector has detected that the drive voltage is less than the threshold value. The controller drops an increasing speed of a current for driving the starter motor when the microcomputer activates the stator motor under the condition that the information is stored in the storage.

Idling stop device and idling stop control method

An idling stop apparatus is provided which can prevent a voltage of a battery from being lowered even when a microcomputer is reset. In an idling stop apparatus when a reset condition is established, reset information indicating that the reset condition is established is stored in a latch circuit and a microcomputer disables an idling stop function when the reset information is stored. The reset information is stored in the latch circuit even when the microcomputer is being reset or even after the microcomputer is reset. Accordingly, the microcomputer after the reset can disable the idling stop function. As a result, it is possible to prevent the voltage of the battery from being lowered due to the idling stop function.

Idling stop apparatus and method for disabling idling stop function

Engine control device includes a delay unit which delays or cuts off a flow of current from a first current system, which directs current to a coil, to a second current system, which directs current to a starter motor. When a starter switch, which turns the flow of current from the power source to the first current system on or off, is turned on and electricity flows to the first current system, the delay unit delays the current flowing from the first current system to the second current system. When electricity flows to the first current system as a result of a controller having turned a first switch on, the delay unit cuts off the flow of electricity from the first current system to the second current system.

Engine control device, vehicle, and engine control method

A power supply control circuit is configured including a MOS-FETconnected between a DC power supplyand a load circuitso that a body diode Dformed between the drain and the source is in a forward direction; and a holding circuitfor maintaining the ON state of the MOS-FETfor a predetermined time when the power supply from the DC power supplyis stopped; where heat generation of the switching element by the surge voltage is suppressed when the surge voltage is generated to prevent breakdown of the switching element while preventing breakdown of internal circuits with respect to reverse connection of the power supply.

Power supply control circuit, and electronic control device, power supplying circuit, and power control integrated circuit equipped with power supply control circuit

An input processing circuit is interposed between input terminals and input ports of an MPU. An output processing circuit is interposed between output ports of the MPU and output terminals. The input processing circuit includes switch sections and processing sections. The output processing circuit includes switch sections and processing sections. A switch control section switches the switch sections based on switch information stored in a switch information storage section to switch a connection relationship between the input terminals and the input ports, processing for an input signal, a connection relationship between the output ports and the output terminals, and processing for an output signal.

Growing community of inventors

Kobe, Japan

Yuichiro Shimizu