Ricoh Company, Ltd.

Nec Electronics Corporation

Takumi Kawamura

Kazuyuki Sato

Norio Muraishi

Sumihiro Inokuchi

Kouji Yamanobe

Mitsufumi Yamamoto

Toyokazu Aoki

Shugo Okamura

An information processing apparatus includes an information storage to store information indicating a state of the information processing apparatus; an information writing processor to write the information to the information storage; a main power source and an auxiliary power source to supply power to the information writing processor; and a discharge controller to control a discharge speed of the auxiliary power source. When a voltage output of the main power source becomes a reference voltage, the discharge controller switches a power source for the information writing processor from the main power source to the auxiliary power source, and then after completing information writing to the information storage by using the information writing processor and the auxiliary power source, the discharge controller controls the discharge speed of the auxiliary power source to decrease a voltage output of the auxiliary power source to a given voltage within a given time period.

Information processing apparatus, power source control method thereof, program thereof, and storage thereof

A resolver-to-digital converting apparatus calculates a resolver rotational angle from two-phase sampling values that are the result of sampling two-phase output signals, which are obtained from a single-phase-excited, two-phase output resolver, at peak timings of a waveform. The apparatus includes a determination unit for determining whether each of the two-phase sampling values has deviated from a prescribed path of rotation by more than a predetermined amount when the two-phase sampling values are represented by orthogonal coordinates; a correction processing unit, responsive to a determination that the predetermined amount has been exceeded, for applying a correction to the two-phase sampling values using an equation of a tangent to the path of rotation at a point on the path of rotation at which the previous resolver rotational angle was obtained; and an angle calculation unit for obtaining a resolver rotational angle at the corrected two-phase sampling values obtained by correction processing.

Resolver-to-digital converting apparatus, method and program

Growing community of inventors

Kanagawa, Japan

Takumi Kawamura