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Temperature control device and oscillator

a technology of temperature control device and oscillator, which is applied in the direction of heat measurement, instruments, optical radiation measurement, etc., can solve the problems of not making the time required for starting up and the magnitude of start-up current variable, so as to reduce increase the temperature stabilizing time of the heated body, and increase the maximum current of the heater

Inactive Publication Date: 2015-05-14
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a temperature control device that can adjust the priority between reducing the time it takes to stabilize the temperature of a heated body and preventing the heater from starting up with too much power. This is achieved by a digital circuit that limits the output of the controller to an upper limit value, which can be adjusted based on the needs of the user. This invention is useful for manufacturing different versions of temperature control devices that meet the requirements of different users.

Problems solved by technology

However, since the start-up time and the start-up current required by a customer depend on an intended use, an oscillator has to be adjusted by rearranging a hardware constitution according to a customer requirement.
However, the magnitude of the start-up current and the time required for starting up are not made variable.

Method used

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Examples

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Embodiment Construction

[0019]FIG. 1 is a block diagram illustrating a whole oscillator using a temperature control device according to an embodiment of the disclosure. This oscillator is configured as an OCXO. The oscillator includes a first crystal unit 10 and a second crystal unit 20. The first crystal unit 10 and second crystal unit 20 employ a common crystal element Xb. The crystal element employed for the first crystal unit 10 may be different from a crystal element employed for the second crystal unit 20.

[0020]For example, the strip-shaped crystal element Xb is divided into two areas in the longitudinal direction, and then electrodes for vibration-excitation are provided on both front and back surfaces of the respective divided areas (vibration areas). Accordingly, the first crystal unit 10 includes one of the divided areas and a pair of electrodes 11 and 12. The second crystal unit 20 includes the other one of the divided areas and a pair of electrodes 21 and 22. Thus, the first crystal unit 10 and...

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PUM

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Abstract

A temperature control device includes a temperature detector, a difference operation unit, a controller, a saturation processing circuit unit, a rewritable storage unit, and a conversion unit. The difference operation unit operates a digital value corresponding to a difference value between a detected temperature value and a target temperature. The controller calculates a manipulated variable using the digital value operated by the difference operation unit. The saturation processing circuit unit includes a digital circuit to limit an output value of the controller to a pre-set upper limit value. The rewritable storage unit stores the upper limit value read from a storage area of the rewritable storage unit and input into the saturation processing circuit unit. The conversion unit converts the output value of the saturation processing circuit unit into an analog signal to output the converted value as a control command value to the heater.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Japanese application serial no. 2013-234145, filed Nov. 12, 2013. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification.BACKGROUND[0002]1. Technical Field[0003]The disclosure relates to a technique to control a temperature of a heated body that is heated by a heater to a target temperature.[0004]2. Description of the Related Art[0005]A situation, which an electronic component is heated to a constant temperature by a heater to stabilize the characteristics of the electronic component, is existed. As an example, what is called an oven crystal controlled oscillator (OCXO) is illustrated. Since a crystal unit changes its frequency in response to the temperature, this type of crystal controlled oscillator is used when an output frequency with high stability is required.[0006]The OCXO detects temperature in the atmosphere ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03B5/04G05D23/19H03B5/32
CPCH03B5/04G05D23/19H03B5/32G05D23/2036
Inventor KOBATA, TSUKASA
Owner NIHON DEMPA KOGYO CO LTD
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