Mitsubishi Denki Kabushiki Kaisha

Kaoru Kawata

Naofumi Harada

Minoru Nakamura

Yuji Tadano

Satoshi Kizawa

Hirotaka Shimizu

Shoji Futami

Yasuhiro Okamura

An information processing apparatus includes a CPU, a memory, and a reference signal generator and operates based on a system clock signal generated by the reference signal generator. The apparatus includes a detection unit for detecting a CPU operational state and a clock control unit for controlling frequency of the system clock signal. The detection unit detects a CPU busy ratio as a CPU operational state indicating the load on the CPU. The clock control unit controls the frequency of the system clock so that the detected CPU busy ratio falls within a permissible range of CPA load.

Information processing apparatus with CPU-load-based clock frequency

An electronic device including an internal battery and an expansion battery can not be operated when the charge in both batteries is drained. Accordingly, when charging the batteries, a control circuit, after confirming that the internal battery is not fully charged, sets an FET to a conductive state and an FET to a non-conductive state. The result is that charging occurs from the internal battery provided the internal battery is not fully charged. After the internal battery is fully charged, the control circuit sets the FET to a non-conductive state and the FET to a conductive state so that this time the expansion battery is charged. Thus, if a short operating time is sufficient, the internal battery can be rapidly charged so that the electronic equipment can be operated by itself after charging for only a short period.

Battery charging and discharging control circuit which charges an

A power circuit for a device having a secondary battery receives commercial electric power supplied externally and supplies electric power to a target in the device and to the secondary battery. The power circuit includes a measuring circuit and a current control circuit. The measuring circuit measures power consumption of the target circuit in the device. The current control circuit controls a charging current to the secondary battery so that the power consumption and the charging current have a negative correlation based on a measurement result of the measuring circuit.

Power circuit

In order to reduce power consumption of the electronic device while it is inactive, the main switch 32 is shifted to the non-conductive state when the electronic device driven by the battery is stopped and the actuating signal decreases below a predetermined voltage, the actuating signal representing the state where the device is in operation. Thus, the power supplied to the control circuit or the like of the electronic device from the battery becomes zero, should a leak current or the like is ignored, and the power consumption can be reduced. In order to start the electronic device, the switch 34 is turned on and the main switch 32 is forced to the conductive state. That is, when the electronic device is started and the actuating signal exceeds the predetermined voltage, the main switch 32 becomes conductive and the electronic device receives power from the battery. In this state, even if the switch 34 is opened, the main switch 32 still remains conductive unless the actuating signal is stopped. Repeated, the main switch 32 is non-conductive while the electronic device is inactive, so that the waste of power of the battery can be prevented.

Low power consumption switching device for power source

A coating alloy to be coated on a substrate which consists essentially of from 40 to 60% by weight of Ni, the rest being Cu and P.

Growing community of inventors

Tokyo, Japan

Kaoru Kawata