JPH11289111A - Power supply for electronic cooling temperature control - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In the temperature control of an electronic cooling device to which a Peltier element is applied, “input” of an input power supply of the Peltier element,
In the "off" control, the temperature of the cooling surface and the heat generating surface of the Peltier element is rapidly changed, and performance degradation due to thermal contraction of the Peltier element has become a problem. SOLUTION: An input voltage suitable for an object to be cooled is always supplied to a Peltier element by controlling an input voltage of the Peltier element to a voltage proportional to a temperature of the object to be cooled, and a cooling surface of the Peltier element and It is possible to reduce the rate of temperature change of the heating surface with respect to time, and to reduce performance degradation due to thermal shrinkage of the Peltier element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic cooling device using a Peltier element that generates a cooling part on one side and a heating part on the other side when a DC voltage is applied, and controls the temperature by controlling the input voltage of the Peltier element. It relates to a voltage application method.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional control example. FIG. 2 shows that the pulsed voltage of the Peltier element 4 is input by inputting a pulsed voltage to the Peltier element 4 and inputting it as shown in FIG. 3 when the object to be cooled is hot and as shown in FIG. The temperature control is performed by changing the time ratio between the high and low input voltage portions to control the power consumption of the Peltier element 4. (1996, CQ Publishing Company, transistor technology, water temperature controller using Peltier element)

Further, as shown in FIG. 5, a differential amplifier 10,
The output voltage of the temperature detecting element 1 is compared with the reference voltages V1, V2, and V3 input to the differential amplifiers 10, 11, and 12 by using a plurality of differential amplifiers as shown in FIGS.
At present, the input voltages of the Peltier element 4 are controlled stepwise as shown in FIG. 6 by inputting the outputs 0, 11, and 12 to the output voltage control circuit of the switching power supply.

As a means for controlling the temperature using the Peltier element 4, Japanese Patent Publication No. Hei 8-12568 discloses a temperature detecting element attached to each of a heating section and a cooling section of the Peltier element, and the temperature is detected based on the detected value. The means for controlling is
Proposed.

[0005]

However, in FIG. 2, there is a problem in that the cost is increased due to the addition of the switching element 2, the heat is generated due to the loss during the switching operation, and the efficiency is reduced.

In FIG. 5, since the input voltage of the Peltier element 4 is controlled in a stepwise manner as shown in FIG. 6, the voltage fluctuation increases as the number of voltage switching due to the temperature change increases. Increase change,
There is a possibility that performance degradation due to thermal contraction of the Peltier element 4 is accelerated.

In view of the above circumstances, the present application changes the input voltage to the Peltier element by changing the output voltage of the switching power supply to a voltage proportional to the temperature of the object to be cooled, thereby performing high-efficiency operation, and By delaying the amount of change in the input voltage to the Peltier element when the element is turned on and off, and when the temperature of the object to be cooled suddenly changes, the rapid temperature change of the Peltier element is reduced and the thermal stress is reduced. Accordingly, it is an object of the present invention to provide a power supply device for an electronic cooling unit that reduces performance deterioration.

[0008]

When a DC voltage is applied between semiconductors, a cooling target is thermally connected by connecting a switching power supply to a Peltier element that generates a cooling unit on one side and a heating unit on the other side, and a cooling unit. A circuit for inputting an output of a temperature detecting element thermally coupled to an object to a first input terminal of a differential amplifier, a circuit for inputting an output voltage of a power supply device to a second input terminal of the differential amplifier, A power supply device having a function of feeding back the output of a differential amplifier to a switching power supply.

[0009] By delaying the amount of change in the input voltage to the Peltier element at the start of operation of the Peltier element and when the temperature of the object to be cooled rapidly changes, the rapid temperature change of the Peltier element can be reduced, and the thermal stress can be reduced. A power supply device having a function of reducing performance deterioration by using the power supply device.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings based on embodiments. Needless to say, the present invention should not be limited to the following embodiments. .

FIG. 1 is a block diagram showing a configuration of an electronic cooling device according to an embodiment of the present invention. As shown in FIG. 7, the temperature detecting element 1 has a characteristic that the resistance value is large when the temperature is low, and the resistance value is small when the temperature is high. The voltage value at the connection point (A) is obtained by connecting to the resistor R10. As shown in FIG. 8, the voltage at the time of low temperature is low and the voltage at the time of high temperature is high, and is input to the first input terminal of the differential amplifier 3.

The output of the voltage conversion circuit 8 of the switching power supply 7 is input to the second input terminal of the differential amplifier 3 and is compared with the voltage of the first input terminal of the differential amplifier 3. When the output voltage is high, the output voltage of the differential amplifier 3 is set to “Hig
When the voltage of the first input terminal is at the “h” level, the output voltage of the differential amplifier 3 becomes the “Low” level.

[0013] By inputting the output voltage of the differential amplifier 3 to the output voltage control circuit 9 of the switching power supply 7, "Hi
gh ”level, the output voltage (B) of the voltage conversion circuit 8
Is high and at the “Low” level, the output voltage of the voltage conversion circuit 8 is controlled to be low.

Therefore, the output voltage characteristic as shown in FIG. 9 is made possible, and the voltage of the Peltier element can be applied in proportion to the temperature of the object to be cooled.

The delay circuit 16 shown in FIG. 1 can be constituted by a charge / discharge circuit using a capacitor or the like. As shown in FIG. 10, the voltage of the part (A) is T1 which is the rise time of the voltage when the power is turned on and the voltage change time T2 and T3 when the temperature of the object to be cooled suddenly changes due to the charging and discharging characteristics of the delay circuit 16. The signal delayed from the temperature detection value of the cooling object like
Peltier element 4 which is input to the first input terminal of differential amplifier 3
Of the input voltage (B) can be moderated.

[0016]

According to the present invention described above, the following effects can be obtained.

By changing the input voltage of the Peltier element to a voltage proportional to the temperature of the object to be cooled, the temperature of the object to be cooled can be kept constant.

By controlling the input voltage of the Peltier element with a voltage proportional to the temperature of the object to be cooled, the temperature change of the cooling surface of the Peltier element due to the temperature change of the object to be cooled is moderated, and the thermal contraction of the Peltier element rapidly To reduce the performance degradation.

By controlling the input voltage of the Peltier element with a voltage proportional to the temperature of the object to be cooled, an input voltage suitable for the Peltier element is always supplied, and highly efficient control can be performed.

By delaying the change in the input voltage of the Peltier element with respect to the rapid temperature change of the object to be cooled, the rapid temperature change of the Peltier element is reduced, and the performance deterioration due to the thermal contraction of the Peltier element is reduced. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram according to the present invention.

FIG. 2 is a block diagram showing a temperature control unit of the conventional electronic cooling device.

FIG. 3 is a waveform of a Peltier element input voltage when the object to be cooled in FIG. 2 is at a high temperature.

FIG. 4 is a waveform of a Peltier element input voltage when the object to be cooled in FIG. 2 is at a low temperature.

FIG. 5 is a block diagram showing a temperature control means of the conventional electronic cooling device.

FIG. 6 shows characteristics of the temperature of the object to be cooled and the input voltage of the Peltier element in FIG. 5;

FIG. 7 shows a characteristic of a temperature and a resistance value of the temperature detecting element shown in FIG.

8 shows characteristics of temperature and output voltage (A) by the circuit of the temperature detecting element and the resistor 10 shown in FIG.

9 shows characteristics of the temperature of the temperature detecting element shown in FIG. 1 and the input voltage (B) of the Peltier element.

10 shows characteristics of the temperature of the temperature detecting element shown in FIG. 1 and the delay time of the input voltage (B) of the Peltier element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature detection element 2 Switching element 3 Differential amplifier 4 Peltier element 5 Amplifier 6 Microcomputer 7 Switching power supply 8 Voltage conversion circuit 9 Output voltage control circuit 10-12 Differential amplifier 16 Delay circuit R10 Resistance V1-V3 Reference voltage

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[Procedure amendment]

[Submission date] July 27, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Power supply unit for electronic cooling temperature control

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiki Sudo 1944-319

Claims (3)

[Claims] In a Peltier switching power supply that generates a cooling section on one side and a heating section on the other side when a DC voltage is applied, an output of a temperature detecting element thermally coupled to an object to be cooled is supplied to a differential amplifier. A circuit for inputting to the first input terminal of
A power supply device having a circuit for inputting an output voltage of a switching power supply to a second input terminal of a differential amplifier, and a function of feeding back the output of the differential amplifier to the switching power supply. 2. A power supply device having a temperature control function by varying a voltage supplied to a Peltier element to a voltage proportional to the temperature of an object to be cooled. 3. A power supply device having a function of delaying a change in input voltage of a Peltier element when power is turned on and off, and when the temperature of an object to be cooled suddenly changes.