Title:
VOLTAGE-CURRENT CONVERSION CIRCUIT
Document Type and Number:
Japanese Patent JP3811906
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enable improvement of measuring precision by increasing output current in approximate proportion to increase of a negative resistance value of a load connected to an output end.
SOLUTION: Input voltage ES is impressed to one input end of an arithmetic amplifier A1 through an input resistor R1, output current iL based on the voltage Es is supplied to a load resistor R1 connected to the output end, and a resistance thermometer bulb is used in the resistor RL to make a temperature sensor. Here, a resistor R1 is less than a resistor R3, the current iL flowing in the resistance thermometer bulb is increased in substantial proportion to increase of the resistor RL. For instance, the resistor RL is 100 Ω, resistors R1, R2, R3, R4, Rs are made 2.5kΩ, 2kΩ, 5.5kΩ, 1kΩ and 1kΩ respectively, and voltage Es is 2.5V. When the circumferential temperature of the temperature sensor is varied within the range of 0-100°C, the current iL increases in proportion to increase of the resistor RL. Thus, an error is lessened in the measuring range, and high precision temperature measuring can be performed.
Inventors:
Yukio Sakata
Application Number:
JP8032496A
Publication Date:
August 23, 2006
Filing Date:
April 02, 1996
Export Citation:
Assignee:
Oki Electric Industry Co., Ltd.
International Classes:
G01K7/20; G01R19/00; G01K7/24; (IPC1-7): G01R19/00; G01K7/20; G01K7/24
Domestic Patent References:
| JP61122534A | ||||
| JP56166613A | ||||
| JP61080466U | ||||
| JP63103929A |
Attorney, Agent or Firm:
Souji Sasaki
Hisao Kobayashi
Saburo Kimura
Noboru Omura
Hisao Kobayashi
Saburo Kimura
Noboru Omura
Previous Patent: MANUFACTURE OF BREAD
Next Patent: ASEISMATIC FOUNDATION AND CONSTRUCTION METHOD THEREOF
Next Patent: ASEISMATIC FOUNDATION AND CONSTRUCTION METHOD THEREOF