Title:
CONSTANT VOLTAGE EQUIPMENT
Document Type and Number:
Japanese Patent JPS6275724
Kind Code:
A
Abstract:
PURPOSE:To obtain a digital constant voltage equipment which can easily be controlled with the main controller of a copying machine, etc., by detecting the squared-mean value of a load voltage by means of hardware and inputting the detected value to a CPU after converting it into a digital value with an A/D converter. CONSTITUTION:A load voltage detected by a transformer 6 is full-wave rectified by a diode bridge 15 and converted into the squared value of the load voltage by means of a polygonal line approximation circuit (squared value circuit) which is composed of a Zener diode 16, resistance 17, and variable resistance 18 and has a square characteristic. Then the converted results are averaged by a capacitor 19 and the squared-means value of the load voltage is detected. The squared mean value is supplied to the A/D converter input of a microcomputer 4. Since the load voltage can be detected in DC level in such a way, the occupying time of a CPU can be shortened and, when this constant-voltage device is used as the lamp regulator of a copying machine, etc., the sampling operation can be executed as part of the microcomputer process of the main control without using an exclusively used controller.
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Inventors:
ISHII KIMIYASU
Application Number:
JP21459485A
Publication Date:
April 07, 1987
Filing Date:
September 30, 1985
Export Citation:
Assignee:
RICOH KK
International Classes:
G05F1/10; (IPC1-7): G05F1/10
Attorney, Agent or Firm:
Kenjiro Take
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