JPH1133339A - Control device for electronic dehumidifier and method for controlling electronic dehumidifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dehumidification capability from deteriorating due to the freezing of a condensate in an electronic dehumidifier at a low temperature and also prevent water leakage from occurring. SOLUTION: The control device for an electronic dehumidifier comprises a temperature sensor 25 for detecting the internal temperature of a box in which electric apparatus is stored, a judgment circuit 26 for outputting a judgment signal when a temperature detected by the sensor 25 is below a specified temperature level, a timer circuit 27 which is activated by the entry of the judgment signal and generates a first output for a specified long time and a second output for a specified short time following the first output and further, does not receive the judgment signal from the judgment circuit 26 until the termination of generating the second output, and a direct current voltage feed and stop circuit 29 which supplies a direct current voltage to an element during the entry of the first output and stops the supply of current to the element during the entry of the second output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electronic dehumidifier and a control method therefor, which prevent a decrease in dehumidifying capacity due to icing on the cooling side of a Peltier device at low temperatures.

[0002]

2. Description of the Related Art In general, electrical equipment for power distribution, control, and the like is housed in a box of electrical equipment installed outdoors. In some cases, the electrical equipment is weak to a high temperature and is guaranteed to have a high temperature. Some have lower maximum temperature. In such a case, it is necessary to take measures against high temperature to prevent the inside of the box from becoming hot due to strong direct sunlight in summer.

On the other hand, as shown in FIG. 6, the relationship between the amount of water in the air and the temperature and relative humidity is as shown in FIG. In such an environment, the metal is apt to rust, and the insulation properties of the electric device are greatly reduced. Therefore, in an environment of high temperature and high humidity, it is necessary to take measures against dew condensation in addition to measures against high temperature.

Next, general electrical equipment will be described with reference to FIG. 7 which is a cutaway right side view and FIG. 8A which is an enlarged sectional view of the electronic dehumidifier of FIG.

[0005] 1 is an outdoor box, 2 is a door closing the front opening of the box 1, 3 is an inner ceiling plate of the box 1, 4 is an inner ceiling plate 3
The support plates 5 fixed to the front and rear portions of the upper surface are outer ceiling plates, which are supported by both support plates 4 and are provided above the inner ceiling plate 3 with an air layer 6 interposed therebetween. Reference numeral 7 denotes an electronic dehumidifier provided at a rear part in the box 1.

Reference numeral 8 denotes a storage case for the electronic dehumidifier 7, and a cut plane having an open front has a vertically long U shape. 9
Is a back plate of the case 8, 10 is a joining table formed by bulging forward and downward integrally with a lower portion of the back plate 9, 11 is an upper fin integrally formed forward on an upper portion of the back plate 9, 12 is a joining member Stand 10
Is a heat conductor integrally formed on the back plate 9 between the upper fin 11 and the upper fin 11, and transfers the heat of the joining table 10 to the upper fin 11
Conducted to.

Reference numeral 13 denotes a top plate of the case 8, 14 denotes an exhaust port formed in the top plate 13, 15 denotes a water receiving portion formed at the bottom of the case 8, and the back plate 9 includes the top plate 13 and the water receiving portion. 15 and left and right side plates are integrally formed. Reference numeral 16 denotes a drain port formed in the water receiving portion 15, 17 denotes a drain hose connected to the drain port 16, 18 denotes a cover plate that closes an opening on the front surface of the case 8, 1
Reference numeral 9 denotes an intake port formed at a lower portion of the cover plate 18.

Reference numeral 20 denotes a Peltier element having one surface joined to the joining table 10, 21 denotes a heat insulating material provided on a peripheral surface of the element 20,
22 is a lower fin mounted on the other surface of the element 20;
It is located below the upper fin 11 and above the water receiving portion 15. Reference numeral 23 denotes a power supply device provided above the upper fin 11, and converts a commercial alternating current into a direct current having a predetermined voltage.
Reference numeral 24 denotes a ventilation fan provided above the power supply unit 23, and is located below the exhaust port 14 of the top plate 13.

Then, heat from direct sunlight is cut off by the outer ceiling plate 5 and the air layer 6, a DC voltage is supplied to the element 20 from the power supply 23, and the lower fin 22
Is cooled, absorbs heat, is radiated from the upper fins 11 via the joint table 10 and the heat conductor 12, and is driven by the fan 24, as shown by an arrow in FIG.
The air that has flowed in is cooled by the lower fins 22, and the water vapor in the air condenses on the lower fins 22 and condenses. The condensed water is discharged from the drain port 16 of the water receiving portion 15 through the drain hose 17, The air dehumidified by the lower fins 22 is warmed by the upper fins 11, discharged from the exhaust port 14 of the top plate 13 to the outside of the case 8 by the fan 24, and the humid air is dehumidified.

(Conventional Example 1) In the conventional example 1 of the control of the dehumidifier 7, a continuous dehumidifying operation is performed irrespective of the temperature, as shown in a flowchart for explaining the operation of FIG. 8B.

(Conventional Example 2) In Conventional Example 2, a temperature sensor 25 is provided below the electronic dehumidifier 7 in the box 1, and the electronic dehumidifier 7
As shown in the flowchart of FIG. 9 for explaining the operation of the control, when the detected temperature of the sensor 25 is higher than the specified temperature T, the continuous dehumidifying operation is performed. When the detected temperature is equal to or lower than the specified temperature T, the dehumidifying operation is stopped. I have.

(Conventional Example 3) Conventional Example 3 will be described with reference to FIG. 10 which is a block diagram of a control circuit thereof. Reference numeral 26 denotes a determination circuit that continues to output a determination signal when the temperature detected by the temperature sensor 25 is equal to or lower than a specified temperature. Reference numeral 27 denotes a timer circuit that starts operating in response to the input of the determination signal from the determination circuit 26. An output and a second output for a predetermined short time following the output of the first output are output, and the input of the determination signal of the determination circuit 26 is not accepted until the output of the second output ends.

Reference numeral 28 denotes a polarity switching circuit,
And the first and second outputs of the timer circuit 27 are input, and when the temperature is higher than a specified temperature and during the input of the first output, a DC voltage having a positive polarity is supplied to the element 20 and the dehumidifier 7 is dehumidified. The operation is performed, and during the input of the second output, the polarity of the DC voltage is switched in the reverse direction to supply power. The dehumidifier 7 performs the deicing operation. After the completion of the second output, the polarity of the DC voltage is changed from the reverse direction to the positive direction again. Switch to the direction.

Next, regarding the operation, FIG. 11 of a flowchart for explaining the operation of the circuit of FIG. 10 and FIG.
This will be described with reference to FIG.

When the internal temperature of the box 1 is higher than the specified temperature T of the dashed line, for example, 10 ° C., the judgment circuit 26 does not output the judgment signal, the timer circuit 27 does not operate, and the polarity switching circuit 2
A positive DC voltage is supplied to the element 20 of the dehumidifier 7 via 8, the lower fin 22 of the element 20 is cooled, and normal continuous dehumidifying operation is performed.

Next, when the internal temperature of the box 1 has become lower than the specified temperature T, the judgment circuit 26 judges that the detected temperature of the sensor 25 has become lower than the specified temperature T, and the timer circuit 27 is activated. The determination signal is output from the circuit 26 to the timer circuit 27, and the first determination is performed for a predetermined long time, for example, 12 hours.
An output and a second output for a predetermined short time, for example, 10 minutes, are output to the polarity switching circuit 28 following the first output, and the polarity switching circuit 28 performs a 12-hour dehumidifying operation during the input of the first output. And then, during the input of the second output, the device 20
The polarity of the DC voltage switches from the forward direction to the reverse direction,
The lower fins 22 of the element 20 are heated, and the thawing operation is performed for 10 minutes.

When the internal temperature of the box 1 is higher than the specified temperature T at the end of the timer output of the timer circuit 27, there is no judgment signal from the judgment circuit 26, and normal dehumidification operation is performed.

If the internal temperature of the box 1 is equal to or lower than the specified temperature T at the end of the second output, the operations of dehumidification and deicing are repeated.

[0019]

In the case of Conventional Example 1, since the dehumidifying operation is performed irrespective of the temperature, the condensed water in the lower fins 22 of the element 20 freezes at a low temperature of 0 ° C. or less, and the dehumidifying capacity is reduced. Is reduced.

Next, in the case of Conventional Example 2, icing at low temperatures can be prevented, but there is a problem that dehumidification at low temperatures is not performed because the dehumidifying operation is stopped below a specified temperature.

In the case of Conventional Example 3, when the internal temperature of the box 1 is, for example, 0 ° C. or less, the water of the lower fins 22 generated by the deicing operation freezes inside the water receiving portion 15 and the drain hose 17. However, the water does not flow and overflows from the water receiving portion 15 to cause water leakage.

In addition, since the polarity of the DC voltage to the element 20 is switched from the forward direction to the reverse direction or from the reverse direction to the forward direction, there is a problem that the Peltier element 20 is damaged by thermal expansion and contraction.

According to the first and third aspects of the present invention, the dehumidification is performed even at a low temperature, and the dehumidification ability due to the freezing of the condensed water on the cooling side of the Peltier element of the electronic dehumidifier is prevented. It is an object of the present invention to provide a control device and a control method for an electronic dehumidifier, which prevent water leakage due to freezing of condensed water inside a drainage hose or a drainage hose and reduce damage to elements due to switching of the polarity of a DC voltage.

According to the second and fourth aspects of the present invention, the power is supplied to the Peltier element by switching the polarity of the DC voltage, but the electronic dehumidifier prevents a decrease in the dehumidifying ability and prevents water leakage. It is an object of the present invention to provide a control device and a control method.

[0025]

According to a first aspect of the present invention, a control device for an electronic dehumidifier is provided.
In a control device of an electronic dehumidifier configured to dehumidify the inside of a box in which electric devices for power distribution and control are stored by supplying a DC voltage from a power supply device to a Peltier element, a temperature inside the box is detected. A temperature sensor, a determination circuit that outputs a determination signal when the temperature detected by the sensor is equal to or lower than a specified temperature, and a first output that is activated by input of the determination signal for a predetermined long time, A timer circuit that outputs all the second outputs for a predetermined short period of time and does not receive the determination signal from the determination circuit until the output of the second output is completed; A DC voltage supply and stop circuit for supplying voltage and stopping supply to the element while the second output is being input.

According to a third aspect of the present invention, there is provided a method for controlling an electronic dehumidifier, comprising: a step of supplying a DC voltage from a power supply to a Peltier device to dehumidify an inside of a box in which electric devices for power distribution, control, and the like are stored. In the control method of the dehumidifier, when the detected temperature of the temperature sensor for detecting the temperature inside the box is equal to or lower than a specified temperature, the DC voltage is supplied to the element for a predetermined long time, and the predetermined long time is supplied. The power supply to the element is stopped for a predetermined short time following the above, and if the detected temperature of the temperature sensor is equal to or lower than the specified temperature after the predetermined short time, the power supply for the long time is stopped. To stop the power supply for a short time.

Therefore, according to the first and third aspects of the present invention, when the detected temperature of the sensor falls below the specified temperature,
For a predetermined long time, power is supplied to the element to perform dehumidification operation,
After that, since the power supply to the element is stopped for a predetermined short time, the condensed water on the cooling side of the electronic dehumidifier frozen in the dehumidifying operation is thawed by the internal temperature of the box due to the heat generated by the electric device. Thus, it is possible to prevent a decrease in the dehumidifying ability due to freezing of the condensed water, and to prevent water leakage.

In addition, freezing of the condensed water is not performed by switching the polarity of the DC voltage from the power supply device to the element, but rather by stopping the dehumidifying operation and melting the ice by the internal temperature of the box. In addition, damage to the element due to the switching of the polarity is eliminated.

Next, a control device according to a second aspect of the present invention is a control device according to the present invention, wherein the temperature detected by the temperature sensor is equal to or lower than the first specified temperature and equal to or higher than a second specified temperature lower than the first specified temperature. A determination circuit that outputs a determination signal to the first and second outputs, and outputs a first output for a predetermined long time and a second output for a predetermined short time following the first output;
A timer circuit that does not receive the determination signal from the determination circuit until the output of the second output ends;
The polarity of the DC voltage from the power supply is set to the positive direction so that the Peltier element performs the dehumidifying operation, and the power is supplied to the element. During the input of the second output, the polarity is switched in the reverse direction so that the element performs the deicing operation. A polarity switching circuit for supplying power to the element, wherein when the detection temperature of the sensor is lower than the second prescribed temperature, the element is supplied with the polarity of the DC voltage in the positive direction.

Further, the control method according to claim 4 is a method for controlling power distribution,
In a control method of an electronic dehumidifier configured to dehumidify a housing in which electric devices for control and the like are stored by supplying a DC voltage from a power supply device to a Peltier element, a temperature sensor for detecting a temperature in the housing. If the detected temperature is equal to or lower than a first specified temperature and equal to or higher than a second specified temperature lower than the first specified temperature, the DC voltage is set so that the element performs a dehumidifying operation for a predetermined long time. Feeding the element with the polarity of the positive direction to the element and feeding the element by switching the polarity in the reverse direction so that the element performs the deicing operation for a predetermined short time following the predetermined long time, When the temperature detected by the temperature sensor after the predetermined short time is equal to or lower than the first specified temperature and equal to or higher than the second specified temperature, the long-time dehumidifying operation and the short-time Perform the thaw operation and perform the inspection after the short time. Temperature is lower than the second specified temperature, and the polarity of the DC voltage in the positive direction power the device, and performs dehumidifying operation.

Therefore, the present invention according to claim 2 and claim 4, when the detected temperature of the sensor is equal to or lower than the first specified temperature and equal to or higher than the second specified temperature lower than the first specified temperature. For a long period of time, a dehumidifying operation by feeding power in the forward direction to the element and a de-icing operation by feeding power in the reverse direction to the element for a predetermined short time are performed, and the detected temperature becomes lower than the first specified temperature. If the temperature is lower than the second specified temperature, the dehumidifying operation is continuously performed, and if the detected temperature of the sensor is lower than the second specified temperature, the amount of moisture in the air is very small. On the cooling side of the electronic dehumidifier, there is little condensed water due to the dehumidifying operation, there is no decrease in the dehumidifying capacity due to the freezing of the condensed water, there is no freezing in the water receiving part and the drainage hose due to the condensed water, and no water leakage .

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. (Embodiment 1) FIG. 1 is a block diagram of a control circuit according to Embodiment 1.
This will be described with reference to FIG. 10, the same reference numerals as those in FIG. 10 denote the same or corresponding components, and 29 denotes a DC voltage supply / stop circuit, which receives the DC voltage of the power supply 23 and the first and second outputs of the timer circuit 27, When the temperature is higher than the specified temperature and during the input of the first output for a predetermined long time, a DC voltage in the positive direction is supplied to the Peltier element 20 of the electronic dehumidifier 7, and the DC voltage is input during the input of the second output for a predetermined short time. Stop supplying power to

Next, the operation will be described with reference to FIG. 2 of the flowchart for explaining the operation of the circuit of FIG. 1 and FIG. 3 of the operation explanatory diagram. When the detected temperature of the temperature sensor 25 is higher than the specified temperature T, there is no output of the determination circuit 26 and the dehumidifier 7
Is supplied with a DC voltage, and the continuous dehumidification operation is performed.

Next, when the detected temperature of the sensor 25 becomes equal to or lower than the specified temperature T, the judgment circuit 26 judges that the detected temperature of the sensor 25 is equal to or lower than the specified temperature T, and the judgment circuit 26 sends a judgment signal to the timer circuit 27. Output, timer circuit 2
7, the timer circuit 27 outputs a first output for a long time of 12 hours, for example, and a second output for a short time of 1 hour following the first output.
In, the dehumidifying operation for 12 hours is performed while the first output is being input, and then the dehumidifying operation for one hour is stopped while the second output is being input.

While the dehumidifying operation is stopped, the condensed water in the lower fins 22 of the dehumidifier 7 frozen by the dehumidifying operation is thawed by the internal temperature of the box 1 due to heat generated by the electric equipment housed in the box 1. You.

For example, the temperature of the outside air is 0 ° C., the internal temperature of the box 1 is 5 ° C., and the temperature of the lower fin 22 of the dehumidifier 7 is −5 ° C.
When the dehumidifying operation is stopped for 1 hour, the temperature of the lower fins 22 rises from -5 ° C to + 5 ° C, which is the internal temperature of the box 1, and the frozen condensed water is thawed.

After the end of the second output, if the detected temperature of the sensor 25 is higher than the specified temperature T, the continuous dehumidifying operation is performed. Dehumidifying operation and short-time operation suspension are repeated.

In the case of the first embodiment, since the condensed water of the frozen lower fins 22 is thawed at the internal temperature of the box 1, the temperature of the outside air is -5 ° C. or more, or the internal temperature of the box 1 is 0
It is desirable that the temperature is not less than ° C.

Therefore, the condensed water frozen in the dehumidifying operation can be thawed by the internal temperature of the box due to the heat generated by the electric equipment, and the dehumidifying ability due to the freezing of the condensed water is prevented from being reduced, thereby preventing water leakage. You. Furthermore, since the deicing of the condensed water is performed by suspending the operation without inverting the polarity of the DC voltage to the element, there is no change in the polarity of the power supply to the element,
Damage to the device is prevented.

(Embodiment 2) Embodiment 2 will be described with reference to FIG. 4 of a flowchart for explaining the operation and FIG. 5 of the operation explanatory view. This embodiment is different from the conventional example 3 in the determination circuit 26 in the block diagram of FIG. That is, the judgment circuit 2
6 is that the determination signal is output when the temperature detected by the temperature sensor 25 is equal to or lower than the first specified temperature and equal to or higher than a second specified temperature lower than the first specified temperature.

For example, the first specified temperature T _{1 is set} to 10 ° C. ± 3
Assuming that the second specified temperature T ₂ is 0 ° C. ± 3 ° C., the detection temperature of the sensor 25 is, for example, 10 ° C. or less and 0 ° C.
In the above case, the judgment signal from the judgment circuit 26 is
7 as in the case of the third conventional example.
The first output for a predetermined long time and the second output for a predetermined short time following the first output are output to the polarity switching circuit 28. In the polarity switching circuit 28, during the input of the first output, for example, The dehumidification operation is performed for 12 hours, and then, during the input of the second output, the polarity of the DC voltage to the element 20 is switched from the forward direction to the reverse direction, and for example, the thawing operation is performed for 10 minutes.

Next, when the detected temperature of the sensor 25 is higher than the first specified temperature T ₁ of 10 ° C. and lower than the second specified temperature T ₂ of 0 ° C., the judgment circuit 26 outputs a judgment signal. Instead, a normal continuous dehumidifying operation is performed.

When the temperature detected by the sensor 25 is lower than 0 ° C., the amount of water in the air is very small, as shown in FIG. There is almost no decrease in the dehumidifying ability due to freezing of the condensed water, and no water leakage due to the condensed water occurs.

[0043]

Since the present invention is configured as described above, it has the following effects. According to the control device of the electronic dehumidifier according to the first aspect of the present invention and the control method according to the third aspect, when the detected temperature of the sensor becomes equal to or lower than the specified temperature, power is supplied to the element for a predetermined long time. After that, the power supply to the element was stopped for a predetermined short time, and condensed water on the cooling side of the electronic dehumidifier frozen in the dehumidifying operation was removed from the inside of the box by the heat generated by the electrical equipment. The ice can be thawed depending on the temperature, and it is possible to prevent a decrease in the dehumidifying ability due to freezing of the condensed water and prevent water leakage.

In addition, freezing of the condensed water is not performed by switching the polarity of the DC voltage from the power supply device to the element, but rather by stopping the dehumidifying operation and by using the internal temperature of the box. In addition, damage to the element due to the switching of the polarity is eliminated.

Further, in the control device according to the second aspect of the present invention and the control method according to the fourth aspect, the temperature detected by the sensor may be the first temperature.
The second temperature which is lower than the specified temperature and lower than the first specified temperature.
When the temperature is equal to or higher than the specified temperature, a dehumidifying operation by feeding power in a forward direction to the element for a predetermined long time and a de-icing operation by feeding power in a reverse direction to the element for a predetermined short time are performed and detected. When the temperature is higher than the first specified temperature, as well as when the temperature is lower than the second specified temperature, the dehumidifying operation is continuously performed.
When the temperature detected by the sensor is lower than the second specified temperature, the amount of water in the air is very small, so that on the cooling side of the electronic dehumidifier, the condensed water due to the dehumidifying operation is small, and the dehumidifying ability is reduced due to freezing of the condensed water. There is no freezing due to condensed water inside the water receiving section and drainage hose, and no water leakage occurs.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit of an electronic dehumidifier according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart for explaining the operation of the first embodiment.

FIG. 3 is an operation explanatory view of a first embodiment.

FIG. 4 is a flowchart illustrating an operation according to the second embodiment of the present invention.

FIG. 5 is an operation explanatory view of a second embodiment.

FIG. 6 is a diagram showing the relationship between the amount of moisture in air, temperature, and relative humidity.

FIG. 7 is a cut right side view of general electric equipment.

8A is an enlarged cross-sectional view of the electronic dehumidifier of FIG. 7, and FIG. 8B is a flowchart for explaining the operation of the conventional example 1 of the control of the electronic dehumidifier.

FIG. 9 is a flowchart for explaining an operation of controlling the electronic dehumidifier of the second conventional example.

FIG. 10 is a block diagram of a control circuit of the electronic dehumidifier of Conventional Example 3.

FIG. 11 is a flowchart for explaining the operation of Conventional Example 3.

FIG. 12 is an operation explanatory view of Conventional Example 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box 20 Peltier element 23 Power supply device 25 Temperature sensor 26 Judgment circuit 27 Timer circuit 28 Polarity switching circuit 29 DC voltage supply and stop circuit

Claims (4)

[Claims] 1. A control device for an electronic dehumidifier which dehumidifies a box housing electrical equipment for power distribution, control and the like by supplying a DC voltage from a power supply to a Peltier element. A temperature sensor for detecting the temperature of the first sensor, a determination circuit for outputting a determination signal when the detected temperature of the sensor is equal to or lower than a specified temperature,
A timer circuit that outputs an output and a second output for a predetermined short period following the first output, and does not receive a determination signal from the determination circuit until the output of the second output ends; Controlling the electronic dehumidifier, comprising: a DC voltage supply and a stop circuit for supplying the DC voltage to the element during the input of the power supply and stopping the power supply to the element during the input of the second output. apparatus. 2. A control device for an electronic dehumidifier in which a box housing electric equipment for power distribution, control and the like is dehumidified by supplying a DC voltage from a power supply to a Peltier element. A temperature sensor for detecting a temperature of the sensor, a temperature detected by the sensor being equal to or lower than a first specified temperature, and
A determination circuit that outputs a determination signal when the temperature is equal to or higher than a second specified temperature lower than the first specified temperature;
A timer circuit that outputs an output and a second output for a predetermined short period following the first output, and does not receive a determination signal from the determination circuit until the output of the second output ends; During the input, the polarity of the DC voltage is set to the positive direction so that the element performs the dehumidifying operation, and the power is supplied to the element. During the input of the second output, the polarity is switched to the reverse direction so that the element performs the deicing operation. And a polarity switching circuit for supplying power to the element by supplying the DC voltage to the element in a positive direction when the detection temperature of the sensor is lower than the second specified temperature. Control device for electronic dehumidifier. 3. A method for controlling an electronic dehumidifier for dehumidifying a box housing electrical equipment for power distribution, control and the like by supplying a DC voltage from a power supply device to a Peltier element. When the detected temperature of the temperature sensor to be detected is equal to or lower than a specified temperature, the DC voltage is supplied to the element for a predetermined long time, and the element is supplied for a predetermined short time following the predetermined long time. Stopping the power supply to the power supply, and when the temperature detected by the temperature sensor after the predetermined short time is equal to or lower than the predetermined temperature, the power supply for the long time is performed.
A method for controlling an electronic dehumidifier, wherein the power supply is stopped for a short time. 4. A method for controlling an electronic dehumidifier in which a box housing electrical equipment for power distribution, control, etc. is dehumidified by supplying a DC voltage from a power supply to a Peltier element. The temperature detected by the temperature sensor that detects the temperature of
When the temperature is equal to or lower than the first specified temperature and equal to or higher than the second specified temperature lower than the first specified temperature, for a predetermined long time,
The element is supplied with the polarity of the DC voltage in the positive direction so that the element performs the dehumidifying operation, and the polarity is set so that the element performs the deicing operation for a predetermined short time following the predetermined long time. When the detected temperature of the temperature sensor after the predetermined short time is equal to or lower than the first specified temperature and equal to or higher than the second specified temperature, the power is supplied to the element by switching in the opposite direction. Performing the long-time dehumidifying operation and the short-time de-icing operation, and when the detected temperature after the short-time is lower than the second specified temperature, the polarity of the DC voltage is set to a positive direction, and A method for controlling an electronic dehumidifier, comprising supplying power to an element and performing a dehumidification operation.