Title:
CLOSED LOOP CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JPS5580104
Kind Code:
A
Abstract:
PURPOSE:To make it possible to reduce a rise in the temperature of hot water by limiting a voltage higher than a fixed value by by-passing a diode in parallel to a circuit of a resistance and capacitor, when a voltage drop across the resistance and capacitor increases above a forward voltage drop across the diode. CONSTITUTION:As detector 7, a negative-characteristic thermistor is used and as control valve 5, an electromagnetic proportional control valve is used to lead a potential divided by thermistor 7 and resistance 10 to the negative input terminal of operator 12 via resistance 11 and also to lead potential E divided by resistances 21 and 22 to the positive input terminal of operator 12. Then, the comparison difference output of operator 12 is inverted to control proportional valve 5 via transistor 13. Here, when a voltage drop across resistance 14 and capacitor 19 increases above forward voltage drop VF across diode 23, diode 23 is by-passed to limit a voltage higher than VF, causing no charge. Consequently, the time from the whole performance range to a control range is shortened in the same integral time and a rise in the temperature of hot water attending upon it can be reduced.
More Like This:
| JPH036701 | CONTROLLER |
| JPS62157904 | PID CONTROLLER |
Inventors:
MORI KEIICHI
UEDA YASUKIYO
MORI KEIJIROU
UEDA YASUKIYO
MORI KEIJIROU
Application Number:
JP15392678A
Publication Date:
June 17, 1980
Filing Date:
December 12, 1978
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G05B11/42; (IPC1-7): G05B11/42