Object temperature control device

• US 4,607,962 A
• Filed: 07/26/1985
• Issued: 08/26/1986
• Est. Priority Date: 05/28/1982
• Status: Expired due to Fees

• Current Assignee: Omron Tateisi Electronics Co. (Omron Corporation)
• Original Assignee: Omron Tateisi Electronics Co. (Omron Corporation)
• Inventors: Nagao, Toshiaki, Sukimoto, Yasuyuki
• Primary Examiner(s): Yasich, Daniel M.
• Application Number:
  US06/758,852
• Time in Patent Office: 396 Days
• Field of Search: 374/170, 374/102, 374/103, 236/78 R, 236/46 F, 364/557, 364/569
• US Class Current: 374/103
• CPC Class Codes: G05D 23/1913 delivering a series of pulses
• CPC Class Codes: G05D 23/1917 using digital means
• CPC Class Codes: G05D 23/20 with sensing elements having variation of electric or magnetic properties with change of temperature G05D23/13 takes precedence

Abstract

An improved temperature control device which is arranged to generate comparative output ratio signals linearly varying successively from a small value to a large value in a manner as in time series in correspondence to sampling period, at each proportional period including several periods of the sampling period, and also to successively compare the output ratio and the comparative output ratio at each of the sampling period, thereby to turn on an output control section at a subsequent sampling period when the sampling output ratio is larger than the comparative output ratio.

Claims

1. In a temperature control device having means for detecting the temperature of an object whose temperature is to be controlled, a target temperature value setting means for setting a desired value of temperature for the object, an operation unit means for determining temperature sampling periods and for effecting a predetermined calculation of an on/off output ratio which is based upon the ratio of said detected object temperature to said target temperature value, and means for producing an output based upon said on/off output ratio, wherein said output is to control means to maintain the temperature of said object at substantially the set desired value, the improvement comprising:

means for generating comparative output ratio signals during each sampling period by said operative unit means, and

means for periodically comparing said on/off output ratio to said comparative output ratio signals by said operative unit means,

whereby said output for control of said temperature is turned on in the next subsequent sampling period when said output ratio is greater than said comparative output ratio.

2. A temperature control device as claimed in claim 1, wherein said temperature detecting means is a thermocouple thermometer.

3. A temperature control device as claimed in claim 1, wherein said temperature detecting means is a thermistor thermometer.

4. A temperature control device as claimed in claim 1, wherein said operation unit means is a micro-processor.

5. The temperature control device as claimed in claim 1 wherein said comparative output signal varies linearly from a small value to a larger value in a time series corresponding to a plurality of said sampling periods.