JP6592511B2 - Air flow control device - Google Patents

Description

  The present invention relates to an air flow rate control device for controlling the air flow rate of a fan in an air circulation type mat.

  In recent years, air-conditioning apparatuses such as air-flowing mats and air-conditioning clothing that cool the body have been put into practical use (for example, see Patent Document 1). For example, the air circulation type mat includes a spacer, a bag-like body, and a blowing means (fan), and is used by being placed on a seating device such as a chair. The spacer is for securing an air passage through which air flows inside the air circulation type mat, and is covered with a bag-like body. The fan is for generating an air flow in the air passage secured by the spacer, and is attached to a predetermined end of the bag-like body. Here, for example, a brush motor is used as the fan motor. In the air circulation type mat, the sweat discharged from the buttock is evaporated when the air flows through the air passage secured by the spacer, and the heel is cooled by the heat of vaporization when the air evaporates. For this reason, when an air circulation type mat is used, it is possible to prevent the heel from coming into contact with the air circulation type mat. For example, the user can adjust the air flow rate of the fan by operating the air volume adjustment knob.

International Publication No. 2004/012564 Pamphlet

  By the way, immediately after the user is seated on the seating device, the air circulation mat itself is cooled, so that the buttock also cools, but the part of the air circulation mat that the buttock is in contact with as time passes is the temperature of the buttock. Gradually warms up and the temperature of the buttock also rises. Therefore, in order to keep the user in a comfortable state at all times, there is a need for an air flow rate control device that can automatically control the air flow rate of the fan so that the temperature of the buttocks approaches a predetermined target temperature.

  In particular, in a battery-type air circulation mat used indoors, battery consumption due to forgetting to turn off the power switch becomes a problem. For example, when an air circulation mat is used in an office, if the user forgets to turn off the power switch when returning home on Friday night, the battery will run out on Saturday and Sunday. In order to prevent this, it is conceivable to provide the bag-like body with a mechanical seating switch that turns on the power supply circuit when the user is seated. However, when such a seating switch is provided, the seating switch may or may not operate depending on the position where the user sits. Also, if an object is placed on the air circulation mat, the seating switch may operate without the user's knowledge and the fan may continue to drive.

  The present invention has been made based on the above circumstances, and can automatically control the air flow rate of the fan so that the temperature of the user's body surface approaches the target temperature when using the air circulation mat, An object of the present invention is to provide an air flow rate control device that can prevent battery waste due to forgetting to turn off a power switch of an air circulation mat.

  The present invention for achieving the above object is an air flow rate control device for controlling the air flow rate of a fan in an air flow type mat, and is disposed at a predetermined portion of the air flow type mat that is substantially in contact with the body surface of a user. Body surface temperature measurement means, measurement temperature conversion means for converting information of the body surface temperature measurement means into measurement temperature corresponding values, target temperature setting means for setting a target temperature for the temperature of the user's body surface, , Target temperature conversion means for converting information of the target temperature setting means into a target temperature corresponding value, an instruction calculation circuit for calculating an instruction value from the measured temperature corresponding value and the target temperature corresponding value, and power supplied to the fan by the instruction value A power control circuit for controlling the rotational speed of the fan, and when the user puts on the air circulation type mat and the measured temperature corresponding value rises close to the target temperature corresponding value, the fan starts blowing, and during use the measured temperature It is equipped with a negative feedback function that controls the air flow rate of the fan so that the value constantly approaches the target temperature value, and the fan blows when the user moves away from the air circulation mat and the measured temperature value falls below the target temperature value. It is characterized by stopping.

  Thus, the air flow control device of the present invention has a negative feedback function for controlling the air flow of the fan based on the measured temperature measured by the body surface temperature measuring means and the target temperature set by the target temperature setting means. Therefore, it is possible to automatically control the air flow rate of the fan so that the measured temperature constantly approaches the target temperature. Also, when the user leaves the air circulation mat and the measured temperature corresponding value falls below the target temperature corresponding value, the fan blower stops, preventing the battery from being wasted due to forgetting to turn off the power switch of the air circulating mat. Can do.

  The blower amount control device of the present invention is such that when the user is placed on the air circulation type mat and the measured temperature corresponding value rises close to the target temperature corresponding value, the fan starts blowing, and the measured temperature corresponding value is the target temperature during use. The air flow rate of the fan can be automatically controlled so as to constantly approach the corresponding value. In addition, since the fan stops when the user leaves the air circulation mat and the measured temperature corresponding value falls below the target temperature corresponding value, the waste of the battery due to forgetting to turn off the power switch of the air circulating mat is prevented. Can do.

FIG. 1 is a schematic view of an air flow control device according to a first embodiment of the present invention. FIG. 2 is a schematic block diagram of the air flow control device. FIG. 3 is a schematic block diagram of a rotation speed control power circuit in the air flow control device of the first embodiment. FIG. 4 is a diagram for explaining an example of the first correspondence relationship between the instruction value and the first duty ratio and the second correspondence relationship between the instruction value and the second duty ratio. FIG. 5 is a diagram showing pulse signals p1, p2, p3, and p4 output from each part of the rotation speed control power circuit when the instruction value is “255”. FIG. 6 is a diagram showing pulse signals p1, p2, p3, and p4 output from each part of the rotation speed control power circuit when the indicated value is “203”. FIG. 7 is a diagram showing pulse signals p1, p2, p3, and p4 output from each part of the rotation speed control power circuit when the indicated value is “50”. FIG. 8A is a diagram showing a change in the temperature of the user's buttocks when the user sits on the air circulation mat with the power switch of the air circulation mat turned off, and FIG. It is a figure which shows the temperature change of a user's buttocks when a person operates the ventilation volume control apparatus and sits on an air circulation type mat. FIG. 9 is a schematic view of an air flow rate control device according to the second embodiment of the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[First embodiment]
First, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an air flow control device according to a first embodiment of the present invention, and FIG. 2 is a schematic block diagram of the air flow control device.

  The air flow control device of the first embodiment is used for an air conditioner such as an air-flowing mat or air conditioning clothing. In general, an air conditioner adjusts the temperature of the body surface by driving a fan to flow air near the body. In the first embodiment, a case will be described in which an air-flowing mat (air-flowing cushion) used on a seating device such as a chair is used as the air conditioner. Here, FIG. 1 shows a state where the air flow control device 1 is applied to the air circulation mat 100.

  First, the air circulation mat 100 will be briefly described. As shown in FIG. 1, the air circulation type mat 100 includes a bag-like body 110, a spacer 120, an air circulation unit 130, a fan (air blowing means) 140, and a power supply device 150. The bag-like body 110 covers the spacer 120. The bag-like body 110 is created by stitching an upper cloth and a lower cloth into a bag shape. For the upper cloth, a material that hardly leaks air and has moisture permeability is used. On the other hand, a material that hardly leaks air is used for the lower cloth. When the air circulation type mat is used, the bag-like body 110 is arranged on the seating surface of the chair so that the collar portion is in contact with the upper cloth. The spacer 120 is for securing an air passage through which air flows inside the bag-like body 110. The spacer 20 is made of plastic and has a structure with extremely low air resistance. Specifically, for example, a spacer disclosed in International Publication No. 2007/094130 can be used.

  The fan 140 circulates air inside the bag-like body 110 by forcibly sucking outside air. The fan 140 is attached to the end of the bag-like body 110. In the first embodiment, for example, a brush motor is used as the fan 140. The rotation speed of the fan 140 changes according to the applied voltage value. The air circulation part 130 is for releasing the air which distribute | circulates the inside of the bag-shaped body 110 outside. The air circulation part 130 is provided at the end of the bag-like body 110 located on the substantially opposite side of the fan 140 in order to circulate air throughout the bag-like body 110. The power supply device 150 supplies power to the fan 140. The power supply device 150 contains four AA batteries. Specifically, the four dry batteries are connected in series. Further, the power supply device 150 is provided with a power switch (not shown) of the air circulation mat 100.

  When a user sits on the bag 110 and the fan 140 is driven, external air is taken into the bag 110 from the fan 140. And when the taken-in air distribute | circulates the inside of the air path ensured with the spacer 120, the sweat which came out from the body (buttock) is evaporated, and a buttocks is cooled by the vaporization heat at the time of the evaporation.

  The air flow control device 1 of the first embodiment is for controlling the air flow of the fan 140 in the air circulation mat 100, and is connected between the fan 140 and the power supply device 150 as shown in FIG. Has been. Specifically, as shown in FIGS. 1 and 2, the air flow control device 1 includes a storage case 10, a body surface temperature measurement unit (body surface temperature measurement unit) 20, and a target temperature setting unit (target temperature setting unit). ) 30, a main body circuit 40, a power input unit 50, and a power output unit 60.

  The storage case 10 stores the main body circuit 40 and is formed in a substantially rectangular parallelepiped shape. As shown in FIG. 1, a target temperature setting unit 30 is provided on the upper surface of the storage case 10. A power input unit 50 is provided on the right end surface of the storage case 10, and a power output unit 60 is provided on the left end surface of the storage case 10. The power input unit 50 is a power input terminal for inputting power supplied from the power supply device 150. The power input unit 50 and the power supply device 150 are connected by an input cable 81. The power output unit 60 is a power output terminal for outputting power supplied to the fan 140. The power output unit 60 and the fan 140 are connected by an output cable 82.

  In the first embodiment, as described above, a dry battery is used as the power supply device 150 of the air circulation mat 100. In general, the voltage of the dry battery decreases with the passage of time of use, but in the first embodiment, for the sake of convenience, the voltage of the power supply input from the power supply device 150 to the air flow control device 1 is always assumed to be 5 V (constant). Therefore, in order to maximize the blowing amount of the fan 140, the blowing amount control device 1 applies a DC voltage of 5V to the fan 140.

  The body surface temperature measuring unit 20 is disposed at a predetermined part of the air circulation mat 100 with which the user's body surface (buttock) is in contact, and measures the temperature of the predetermined part, and thus the body surface temperature. It is. In the first embodiment, a thermistor is used as the body surface temperature measuring unit 20, and the body surface temperature measuring unit 20 is provided on the surface of the upper cloth of the bag-like body 110. The body surface temperature measuring unit 20 is connected to the main body circuit 40.

  The target temperature setting unit 30 is for the user to set a target temperature for the temperature of the body surface (buttock). In the first embodiment, a variable resistor is used as the target temperature setting unit 30, and the target temperature setting unit 30 is disposed on the upper surface of the storage case 10. Specifically, as shown in FIG. 1, the target temperature setting unit 30 includes a knob for the user to switch the resistance value, and a scale that describes the temperature corresponding to the resistance value. In 1st embodiment, each temperature from 30 degreeC to 35 degreeC is described on the scale. As a matter of course, the scale may indicate a temperature over a wider range, for example, each temperature from 28 ° C. to 36 ° C. The target temperature setting unit 30 is connected to the main body circuit 40.

  The target temperature setting unit 30 is provided for the following reason. Usually, since the user's buttocks are in contact with the body surface temperature measuring unit 20 through pants or the like, there is a slight difference between the temperature measured by the body surface temperature measuring unit 20 and the actual temperature of the buttocks. In addition, the body surface temperature at which people feel comfortable varies. In general, the body surface temperature at which an obese person feels more comfortable is lower. In consideration of these points, in the first embodiment, the user himself / herself can freely set the target temperature within a range from 30 ° C. to 35 ° C.

  The main body circuit 40 controls electric power output to the fan 140. As shown in FIG. 2, the main body circuit 40 includes a measurement temperature conversion unit (measurement temperature conversion unit) 41, a target temperature conversion unit (target temperature conversion unit) 42, and , An instruction calculation circuit 43 and a rotation speed control power circuit 44. Here, the measured temperature conversion unit 41, the target temperature conversion unit 42, the instruction calculation circuit 43, and the rotation speed control power circuit 44 are independent circuits. The measurement temperature conversion unit 41 converts the temperature measured by the body surface temperature measurement unit 20 (information of the body surface temperature measurement unit 20, in this case, the resistance value of the thermistor) into a measurement temperature corresponding value that is an electric signal value corresponding thereto. To convert. Further, the target temperature conversion unit 42 sets the target temperature set by the target temperature setting unit 30 (information of the target temperature setting unit 30, in this case, the resistance value of the variable resistor) as a target temperature that is an electric signal value corresponding thereto. This is converted to the corresponding value.

  The instruction calculation circuit 43 corresponds to the measured temperature converted by the measured temperature conversion unit 41 from the temperature (measured temperature) measured by the body surface temperature measuring unit 20 and the target temperature set by the target temperature setting unit 30. The instruction value is calculated from the value and the target temperature corresponding value converted by the target temperature converter 42. Specifically, the instruction calculation circuit 43 determines the pulse voltage applied to the fan 140 based on the measured temperature corresponding value converted by the measured temperature converting unit 41 and the target temperature corresponding value converted by the target temperature converting unit 42. One indication value is determined from the indication values in a plurality of stages for determining the duty ratio and amplitude of the signal. The instruction value determined by the instruction calculation circuit 43 is output to the rotation speed control power circuit 44.

  The rotation speed control power circuit 44 controls the power supplied to the fan 140 based on the instruction value. Specifically, the rotation speed control power circuit 44 generates a pulse voltage having a predetermined duty ratio and a predetermined amplitude based on the instruction value output from the instruction calculation circuit 43 and outputs the pulse voltage to the fan 140. Thus, in the first embodiment, the rotation speed control power circuit 44 controls the fan 140 using a pulse width control method for controlling the duty ratio and the pulse amplitude. This is due to the following reason. In order to drive a general fan, a voltage equal to or higher than the minimum drive voltage must be applied to the fan for at least a certain time (minimum application time). For example, the minimum drive voltage of the fan 140 used in the first embodiment is 1.8V. For this reason, it is difficult to continuously control the air flow rate of the fan 140 from the maximum amount to zero only by controlling the voltage applied to the fan 140. As a practical method for continuously controlling the amount of air blown by the fan 140, there is a pulse width control method for controlling a ratio (duty ratio) of applying a constant voltage (5V) to the pulse period. However, even if a simple pulse width control method is used, since the minimum application time of the fan 140 is not zero, a very small amount of blown air cannot be realized unless the pulse period is significantly increased. Also, if the pulse period is very large, a very small amount of air flow can be realized, but the fan stop time becomes long, the heel portion cannot be cooled quickly, and comfort is impaired. In addition, in this case, since the fan 140 is frequently rotated and stopped, there is a problem that the driving sound is noisy. In order to solve these problems, the rotation speed control power circuit 44 uses not the pulse width control method for controlling only the duty ratio but the pulse width control method for controlling the duty ratio and the pulse amplitude. Yes.

  In the first embodiment, digital values from 0 to 255 are used as the instruction values in a plurality of stages. Here, when the maximum instruction value “255” is determined, the rotation speed control power circuit 44 has a pulse voltage with a duty ratio of 100% and an amplitude of 5 V, that is, a DC voltage of 5 V supplied from the power supply device 150. The voltage is output to the fan 140 as it is. On the other hand, when the minimum instruction value “0” is determined, rotation speed control power circuit 440 outputs a pulse voltage with a duty ratio of 0%, that is, does not output a voltage to fan 140. When the instruction value between “255” and “0” is determined, the rotation speed control power circuit 440 causes the air flow rate of the fan 140 to decrease substantially continuously as the instruction value decreases. The pulse voltage is output to the fan 140. Thus, there is a predetermined correspondence between the indicated value and the duty ratio and amplitude of the pulse voltage applied to the fan 140.

  Specifically, the instruction calculation circuit 43 compares the measured temperature correspondence value with the target temperature correspondence value, and the measured temperature correspondence value is lower than the target temperature correspondence value, and is the absolute value of the difference between the measurement temperature correspondence value and the target temperature correspondence value. Is greater than a predetermined value, a minimum instruction value “0” corresponding to not outputting a pulse voltage to the fan 140 is determined. Also, when the measured temperature corresponding value is lower than the target temperature corresponding value and the absolute value of the difference between the measured temperature corresponding value and the target temperature corresponding value is not more than the predetermined value, or the measured temperature corresponding value is the target temperature corresponding value. When it is above, an instruction value that can bring the measured temperature close to the target temperature is determined. Therefore, it can be said that the main circuit 40 has a negative feedback function for controlling the output of the pulse voltage based on the measured temperature corresponding value and the target temperature corresponding value. By using the air flow control device 1 of the first embodiment for the air circulation mat 100, the air flow control device 1 automatically controls the air flow of the fan 140 so that the temperature of the user's buttocks approaches the target temperature. can do. In the first embodiment, it is assumed that the predetermined value is 0.5 ° C. when the predetermined value is converted into temperature. Therefore, for example, when the target temperature is 33 ° C., power is supplied to the fan 140 if the measured temperature is 32.5 ° C., whereas power is supplied to the fan 140 if the measured temperature is 32 ° C. Not. In general, the value obtained when this predetermined value is converted into temperature is not limited to 0.5 ° C., and can be set to an arbitrary value.

  Therefore, in the first embodiment, the main body circuit 40 starts blowing the fan 140 when the user rests on the air circulation mat 100 and the measured temperature corresponding value rises close to the target temperature corresponding value. After 140 starts blowing, the air flow rate of the fan 140 is controlled so that the measured temperature corresponding value constantly approaches the target temperature corresponding value, and the user leaves the air circulation mat 100 and the measured temperature corresponding value is the target value. When the temperature is below the temperature-corresponding value, the fan 140 stops blowing.

  Next, a specific configuration of the rotation speed control power circuit 44 will be described in detail. FIG. 3 is a schematic block diagram of the rotation speed control power circuit 44 in the air flow control device 1 of the first embodiment. As shown in FIG. 3, the rotation speed control power circuit 44 includes a signal generation unit 440 that generates a pulse signal, and a power generation unit 450 that converts the pulse signal generated by the signal generation unit 440 into a pulse voltage. In the first embodiment, the signal generation unit 440 is configured by a microcomputer.

  As shown in FIG. 3, the signal generation unit 440 includes a clock unit 441, first frequency generation unit 442, second frequency generation unit 443, first modulation unit 444, second modulation unit 445, and an AND circuit. (Logical product circuit) 446.

The clock unit 441 generates an operation clock of 1.28 MHz. The first frequency generation means 442 generates a 20 KHz signal by dividing the operation clock by 64, and the second frequency generation means 443 generates the 20 KHz signal generated by the first frequency generation means 442 by 2 A signal of 0.305 Hz is generated by dividing by ¹⁶ . Here, the 20 KHz signal generated by the first frequency generating means 442 is referred to as a “first frequency signal”, and the 0.305 Hz signal generated by the second frequency generating means 443 is referred to as a “second frequency signal”. I will call it. Thus, the second frequency is sufficiently smaller than the first frequency.

The first modulation means 444 determines the first duty ratio corresponding to the instruction value output from the instruction arithmetic circuit 43, and modulates the pulse width of the signal of the first frequency to have the determined first duty ratio. One pulse signal p1 is generated. Therefore, the first pulse signal p1 has a pulse period T1 (5 × 10 ⁻⁵ seconds) which is the reciprocal of the first frequency, and the duty ratio of the first pulse signal p1 is the first duty ratio described above.

  The second modulation means 445 determines the second duty ratio corresponding to the instruction value output from the instruction calculation circuit 43, and modulates the pulse width of the signal of the second frequency to have the determined second duty ratio. A two-pulse signal p2 is generated. Therefore, the second pulse signal p2 has a pulse period T2 (3.28 seconds) that is the reciprocal of the second frequency, and the duty ratio of the second pulse signal p2 is the second duty ratio.

  The AND circuit 446 outputs the third pulse signal p3 obtained by taking the logical product of the first pulse signal p1 and the second pulse signal p2 to the power generation unit 450. Since the first duty ratio of the first pulse signal p1 and the second duty ratio of the second pulse signal p2 change according to the instruction value, the waveform of the third pulse signal p3 output from the AND circuit 446 is also the instruction value. It changes according to.

  Further, as shown in FIG. 3, the power generation unit 450 includes an impedance conversion circuit (impedance conversion unit) 451 and a smoothing circuit (smoothing unit) 452. The impedance conversion circuit 451 converts the third pulse signal p3 into a pulse voltage having a low impedance using a DC voltage input from the outside. This is because the third pulse signal p3 output from the signal generator 440, which is a microcomputer, is generally in a high impedance state, and the third pulse signal p3 cannot be used as power as it is. Specifically, the impedance conversion circuit 451 can be manufactured using a transistor.

  The smoothing circuit 452 performs a smoothing process on a portion corresponding to the first pulse signal p1 in the pulse voltage converted by the impedance conversion circuit 451, whereby a predetermined duty ratio corresponding to the indicated value output from the arithmetic circuit 43 and A pulse voltage p4 having a predetermined amplitude is generated and output to the fan 140. Therefore, the smoothing circuit 452 needs to cut off the first frequency and hardly influence the second frequency. In the first embodiment, since the first frequency is sufficiently larger than the second frequency, such a smoothing circuit 452 can be manufactured with a choke coil and a capacitor at a very low cost.

  Next, specific examples of the pulse signals p1, p2, p3, and p4 generated at each part of the rotation speed control power circuit 44 will be described.

  In the first embodiment, a predetermined first correspondence between the instruction value and the first duty ratio and a predetermined second correspondence between the instruction value and the second duty ratio are set in advance. The first modulation means 444 obtains a first duty ratio corresponding to the indicated value based on the first correspondence relationship, and the second modulation means 445 obtains a second duty ratio corresponding to the indicated value based on the second correspondence relationship. Ask. FIG. 4 is a diagram for explaining an example of the first correspondence relationship between the instruction value and the first duty ratio and the second correspondence relationship between the instruction value and the second duty ratio. In FIG. 4, the horizontal axis represents the instruction value, and the vertical axis represents the duty ratio (%). The first correspondence relationship is indicated by a solid line, and the second correspondence relationship is indicated by a broken line. The data indicating the first correspondence relationship and the data indicating the second correspondence relationship may be stored in advance in a memory (not shown) or the first modulation means 444 (second modulation means 445). ) May include the contents of the first correspondence relationship (second correspondence relationship) in the arithmetic expression used when obtaining the first duty ratio (second duty ratio).

  Specifically, the first correspondence relationship is such that the first duty ratio is linearly increased from 100% to a predetermined value, for example, 40% as the instruction value decreases from the maximum value “255” to the predetermined switching value “100”. The first duty ratio is determined to remain at a predetermined value (40%) as the instruction value decreases and the instruction value decreases from the switching value “100” to the minimum value “0”. The second correspondence relationship is that the second duty ratio remains 100% as the instruction value decreases from the maximum value “255” to the switching value “100”, and the instruction value changes from the switching value “100” to the minimum value. It is determined that the second duty ratio decreases linearly from 100% to 0% as it decreases to “0”.

  The first modulation means 444 obtains a first duty ratio corresponding to the instruction value output from the instruction calculation circuit 43 based on the first correspondence relationship, and generates a first pulse signal p1 having this first duty ratio. The second modulation means 445 obtains a second duty ratio corresponding to the instruction value output from the instruction calculation circuit 43 based on the second correspondence relationship, and generates a second pulse signal p2 having this second duty ratio. Then, the AND circuit 446 outputs the third pulse signal p3 obtained by taking the logical product of the first pulse signal p1 and the second pulse signal p2 to the power generation unit 450.

  Note that the second modulation unit 445 may not be able to accurately set the second duty ratio of the second pulse signal p2 to 100% when the indicated value is higher than the switching value “100” due to the convenience of circuit design. is there. In such a case, the second modulation means 445 does not necessarily need to set the second duty ratio to 100%, and it is only necessary to be able to make the value close to 100%. Similarly, when the instruction value is smaller than the switching value “100”, the first modulation unit 444 does not necessarily need to accurately set the first duty ratio of the first pulse signal p1 to 40%, and is close to 40%. It only needs to be a value.

  First, the case where the instruction calculation circuit 430 outputs the instruction value “255” will be described. FIG. 5 is a diagram showing pulse signals p1, p2, p3, and p4 output from each part of the rotation speed control power circuit 44 when the instruction value is “255”. In this case, as shown in FIG. 4, the first duty ratio is 100% and the second duty ratio is also 100%. Therefore, both the first pulse signal p1 output from the first modulation means 444 and the second pulse signal p2 output from the second modulation means 445 are 5V DC signals as shown in FIG. . At this time, the third pulse signal p3 output from the AND circuit 446 is also a DC signal of 5V as shown in FIG. Therefore, as shown in FIG. 5C, the power generation unit 450 outputs a DC voltage of 5V as the pulse voltage p4 and supplies the DC voltage to the fan 140. As a result, the fan 140 rotates at the maximum number of rotations, and the air volume of the fan 140 is maximized.

  Next, the case where the instruction calculation circuit 430 outputs the instruction value “203” will be described. FIG. 6 is a diagram showing pulse signals p1, p2, p3, and p4 output from each part of the rotation speed control power circuit 44 when the instruction value is “203”. In this case, as shown in FIG. 4, the first duty ratio is about 80% and the second duty ratio is 100%. For this reason, as shown in FIG. 6A, the first modulation means 444 outputs a first pulse signal p1 with a duty ratio of 80% at a cycle T1. Here, the amplitude of the first pulse signal p1 is 5V. As shown in FIG. 6A, the second modulation means 444 outputs a 5V DC signal as the second pulse signal p2. At this time, as shown in FIG. 6B, the AND circuit 446 outputs a third pulse signal p3 having the same waveform as the first pulse signal p1. Further, since the smoothing circuit 452 performs the smoothing process only on the portion corresponding to the first pulse signal p1 in the pulse voltage converted by the impedance conversion circuit 451, the smoothing circuit 452 starts from the smoothing circuit 452 as shown in FIG. In addition, a DC voltage of about 4 V is output as the pulse voltage p4 and supplied to the fan 140. As a result, the fan 140 rotates at a rotation speed corresponding to a voltage value of 4V.

  When the instruction calculation circuit 43 outputs an instruction value between the maximum value “255” and the switching value “100”, the second duty ratio is 100% as in the case where the instruction value is “203”. It remains. For this reason, a DC voltage is always output from the smoothing circuit 452 as the pulse voltage p4. At this time, the voltage value of the voltage output from the smoothing circuit 452 is converted into an instruction value, that is, a predetermined voltage value corresponding to the first duty ratio. Actually, as the indicated value continuously changes from the maximum value “255” to the switching value “100”, the DC voltage output from the smoothing circuit 452 changes substantially continuously from 5V to 2V.

  Next, the case where the instruction calculation circuit 43 outputs the instruction value “50” will be described. FIG. 7 is a diagram showing pulse signals p1, p2, p3, and p4 output from each part of the rotation speed control power circuit 44 when the instruction value is “50”. In this case, the first duty ratio is 40% and the second duty ratio is 50%. For this reason, as shown in FIG. 7A, the first modulation means 444 outputs a first pulse signal p1 with a duty ratio of 40% at a period T1. On the other hand, as shown in FIG. 7A, the second modulation means 445 outputs a second pulse signal p2 with a duty ratio of 50% at a period T2. Here, the amplitude of the first pulse signal p1 and the amplitude of the second pulse signal p2 are both 5V. Further, as shown in FIG. 7B, the third pulse signal p3 having the same waveform as the first pulse signal p1 is output from the AND circuit 446 at a half interval of T2. Since the first duty ratio is 40% and the second duty ratio is 50%, as shown in FIG. 7C, the smoothing circuit 452 has a duty ratio of 50% and an amplitude of 2V. A pulse voltage p <b> 4 is output and supplied to the fan 140. Thereby, the fan 140 repeats rotation and stop according to the pulse voltage p4.

  When the instruction calculation circuit 43 outputs an instruction value between the switching value “100” and the minimum value “0”, the first duty ratio is 40% as in the case where the instruction value is “50”. It remains. For this reason, the smoothing circuit 452 always outputs a pulse voltage p4 having an amplitude of 2V. Here, the cycle of the pulse voltage p4 is T2 (3.28 seconds). Further, the duty ratio of the pulse voltage p4 output from the smoothing circuit 452 changes according to the instruction value, that is, the second duty ratio. Actually, as the indicated value continuously changes from the switching value “100” to the minimum value “0”, the duty ratio of the pulse voltage p4 output from the smoothing circuit 452 changes substantially continuously from 100% to 0%. To do.

  In the first embodiment, when the instruction value is “100” or less, the amplitude of the pulse voltage p4 always remains 2V. This is because the minimum driving voltage of the fan 140 in the air circulation mat 100 is 1.8 V, and any instruction value other than “0” can be used to finely control the air flow rate of the fan 140 according to the instruction value. This is because it is necessary to apply a pulse voltage p4 of 1.8 V or higher to the fan 140 even when the above is determined.

  When the instruction value is smaller than “100”, the fan 140 repeats rotation and stop according to the pulse voltage p4. However, in practice, when the indicated value is not much smaller than “100”, the duty ratio of the pulse voltage p4 is sufficiently large, so that the fan 140 continuously rotates due to inertia. When the instruction value is sufficiently smaller than “100”, the fan 140 repeats rotation and stop. However, since the amplitude of the pulse voltage p4 applied to the fan 140 is 2V, which is less than half of the maximum amplitude (5V), even if the user repeatedly rotates / stops the fan 140, the driving sound of the fan 140 can be heard. I don't feel noisy.

  Thus, the rotation speed control power circuit 44 generates the pulse voltage p4 having a predetermined duty ratio and a predetermined amplitude according to the instruction value. Since the indicated value is determined from 256 levels from “255” to “0”, the rotational speed control power circuit 44 sets the air flow rate of the fan 140 in 256 levels from the maximum air flow rate to the air flow rate zero. Can be finely adjusted. Therefore, the air volume of the fan 140 substantially corresponds to the indicated value, and can be changed substantially continuously from the maximum air volume to the air volume of zero.

  Next, the cooling effect of the user's buttocks when the air flow control device 1 of the first embodiment is used for the air circulation mat 100 will be described. The present inventors used the air circulation mat 100 indoors at a temperature lower than the temperature of the body surface, and measured the temperature change of the user's buttocks at that time. Specifically, the indoor environment is a temperature of 30 ° C. and a humidity of 50%. In addition, the temperature of a standard human body surface is about 33 ° C.

  First, the present inventors examined the temperature change of the user's buttocks when the user sat on the air circulation mat 100 with the power switch of the air circulation mat 100 turned off. FIG. 8A is a diagram showing a temperature change of the user's buttocks when the user sits on the air circulation mat 100 with the power switch of the air circulation mat 100 turned off. Here, in Fig.8 (a), a horizontal axis represents elapsed time and a vertical axis | shaft represents the temperature of a collar part. In this case, since the fan 140 does not operate, no air flow is generated in the bag-like body 110 of the air circulation mat 100. That is, the air circulation mat 100 is used as a simple cushion. Immediately after the user sits on the air circulation mat 100, the surface temperature of the air circulation mat 100 is 30 ° C., which is the same as the indoor temperature, and is lower than the temperature of the buttocks. As shown in FIG. 8A, the surface temperature of the air circulation mat 100 in contact with the heel increases with time, and the surface temperature of the air circulation mat 100 eventually becomes the same temperature (33 ° C.) as the temperature of the heel. Become. When the temperature difference between the buttock and the surrounding area disappears in this way, heat cannot be radiated from the buttock, so that an appropriate amount of sweat comes out from the sweat glands of the buttock. Initially, the humidity inside the air-flowing mat 100 is 50%, and the sweat discharged from the sweat glands enters the air-flowing mat 100 through the bag-like portion 110 and vaporizes there. At this time, due to the heat of vaporization that sweat takes away from the surroundings during the vaporization, the user's body is physiologically adjusted so that the temperature of the buttocks does not further increase, and the temperature of the buttocks stays at 33 ° C. However, when the humidity inside the air circulation mat 100 eventually increases and sweat cannot be vaporized, the temperature of the buttocks increases greatly.

  Next, the present inventors examined the temperature change of the user's buttocks when the user operated the air flow control device 1 and sat on the air circulation mat 100. FIG. 8B is a diagram showing a temperature change of the user's buttocks when the user operates the air flow control device 1 and sits on the air circulation mat 100. Here, in FIG.8 (b), a horizontal axis represents elapsed time and a vertical axis | shaft represents the temperature of a buttocks. In this case, the user uses the target temperature setting unit 30 to set the target temperature to 33 ° C. As described above, the air volume control device 1 of the first embodiment can adjust the air volume of the fan 140 in 256 stages from the maximum air volume to zero air volume. Specifically, the air flow control device 1 controls the fan 140 so that the fan 140 blows a large amount of air when the measured temperature is higher than the target temperature, and conversely, when the measured temperature is lower than the target temperature. Controls the fan 140 so that the fan 140 blows a small amount of air or stops blowing. Therefore, before the user sits on the air circulation mat 100, the measurement temperature measured by the body surface temperature measurement unit 20 indicates the indoor temperature (30 ° C.), which is 0.5 ° C. or more lower than the target temperature. Therefore, the air flow control device 1 does not supply power to the fan 140, and the fan 140 does not operate. When the user sits on the air circulation mat 100, the surface of the air circulation mat 100 is warmed by the collar, and the measurement temperature measured by the temperature measurement unit 20 gradually increases. When the measured temperature reaches a predetermined temperature (32.5 ° C.), the air flow control device 1 starts supplying power to the fan 140 and the fan 140 starts to operate. When the measured temperature is lower than the target temperature, only a small amount of air is blown from the fan 140, and the measured temperature continues to rise more slowly. Eventually, the measured temperature reaches the target temperature. When the measured temperature exceeds the target temperature, the blower amount control device 1 controls the fan 140 so that the fan 140 blows a large amount of air. Note that if the ambient temperature is high and the measured temperature does not reach the target temperature even when the fan 140 blows with the maximum airflow, the airflow control device 1 continues to blow with the maximum airflow. Thus, the fan 140 is controlled.

  Thereafter, when the user leaves the air circulation mat 100, the measurement temperature measured by the temperature measurement unit 20 gradually decreases. When the measured temperature is lower than the target temperature by 0.5 ° C., the air flow control device 1 stops supplying power to the fan 140 and the drive of the fan 140 stops. Therefore, when the air circulation mat 100 is used indoors at a temperature lower than the temperature of the body surface, even if the power switch is kept on, if the user leaves the air circulation mat 100, the fan 140 will eventually be used. Will stop working.

  The air flow rate control device of the first embodiment has a negative feedback function for controlling the air flow rate of the fan based on the measured temperature measured by the body surface temperature measuring unit and the target temperature set by the target temperature setting unit. As a result, the air flow rate of the fan can be automatically controlled so that the measured temperature constantly approaches the target temperature. In addition, since the fan stops when the user leaves the air circulation mat and the measured temperature corresponding value falls below the target temperature corresponding value, the waste of the battery due to forgetting to turn off the power switch of the air circulating mat is prevented. Can do.

  Also, even when a small air flow rate is required, such as when the ambient temperature is not so high, the fan air flow rate can be automatically adjusted in 256 steps, so that the user's body is not too cold. . Furthermore, in the air flow control device of the first embodiment, the target temperature setting unit is provided, so that any type of person such as a user who gets hot or cold gets himself / herself depending on the clothes he / she wears. You can set the target temperature that you feel is optimal. When the target temperature is set lower than necessary, the amount of sweating is suppressed by an instruction from the brain temperature adjustment center. The air circulation mat is used to cool the body using the physiological cooler action that humans have, and when setting a target temperature that deviates from using the physiological cooler action, naturally, The negative feedback function by the air flow control device does not work very effectively.

  Furthermore, in the air flow rate control device of the first embodiment, the rotation speed control power circuit reduces the amplitude from the maximum amplitude value to a predetermined value (for example, 2 V) as the indicated value decreases from the maximum value to the predetermined switching value. However, the duty ratio remains 100%, and as the indicated value decreases from the switching value to the minimum value, the duty ratio approaches 100% to 0%, and the amplitude remains at the value (for example, 2V) at the switching value. A simple pulse voltage. As a result, when the indicated value is within the range from the maximum value to the switching value, a DC voltage having an amplitude corresponding to the indicated value is output to the fan, and the fan is always driven. Is smaller than the switching value, a pulse voltage having a duty ratio corresponding to the indicated value and an amplitude corresponding to the switching value is supplied to the fan, and the fan repeats rotating and stopping. In this way, when the indicated value is smaller than the switching value, the amplitude of the pulse voltage applied to the fan is smaller than the maximum amplitude value, so that it is possible to realize a small air flow rate without increasing the period of the pulse voltage. In addition, the user does not feel noisy driving sound when the fan rotates and stops.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a schematic view of a blower amount control apparatus according to the second embodiment of the present invention. In the second embodiment, those having the same functions as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the second embodiment, as shown in FIG. 9, an air-flowing mat (air-flowing bedding) 100A used on a bedding such as a futon is used as an air conditioner. The user lies on the air circulation mat 100A and operates the air circulation mat 100A to cool the entire body of the user. A commercial power source is used as the power source for the air circulation mat 100A. For this reason, the air circulation mat 100A includes an AC adapter 160 that converts the commercial power source into a DC power source. In addition, the power input unit 50 and the AC adapter 160 of the air flow control device 1A of the second embodiment are connected by an input cable 91, and the power output unit 60 of the air flow control device 1A and the air circulation mat 100A are connected. The fan 140 is connected by an output cable 92.

  As shown in FIG. 9, the air flow control device 1A of the second embodiment includes a storage case 10, three body surface temperature measuring units 20a, 20b, and 20c, a target temperature setting unit 30, a main body circuit 40, A power input unit 50 and a power output unit 60 are provided. The difference between the blower amount control device 1A of the second embodiment and the blower amount control device of the first embodiment is that three body surface temperature measuring units are provided. Corresponding to the provision of three body surface temperature measurement units, three measurement temperature conversion units in the body circuit 40 are also provided. Other configurations are the same as those in the air flow control device of the first embodiment.

  In the air circulation type mat 100A used on the bedding, unlike the air circulation type mat used on the chair, the posture of the body may change while the user is sleeping. If only one body surface temperature measurement unit is provided, the body surface temperature measurement unit may not be able to detect the temperature of the body surface. Therefore, in the second embodiment, as shown in FIG. 9, three body surface temperature measuring units 20a, 20b, and 20c are respectively provided at predetermined locations on the bag-like body 110 of the air circulation mat 100A. Specifically, the three body surface temperature measurement units 20a, 20b, and 20c are arranged at a certain interval at a substantially central portion of the air circulation mat 100A. As a result, even if the posture of the user's body changes on the air circulation mat 100A, the body always comes into contact with a location where at least one body surface temperature measuring unit is provided.

  The three body surface temperature measuring units 20a, 20b, and 20c are connected to the main body circuit 40, respectively. In the second embodiment, the instruction calculation circuit 430 of the main circuit 40 determines the instruction value using the highest measured temperature corresponding value among the three measured temperature corresponding values converted by the three measured temperature conversion units. Thereby, even if the posture of the body changes while the user is sleeping, the main body circuit 40 can control the blowing amount of the fan 140 based on the measured temperature indicating the body surface temperature.

  The air flow control device of the second embodiment has the same operations and effects as the air flow control device of the first embodiment. In particular, in the blast volume control device of the second embodiment, three body surface temperature measurement units and three measurement temperature conversion units are provided, and the instruction calculation circuit has three measurement temperatures converted by the three measurement temperature conversion units. By using the highest measured temperature corresponding value among the corresponding values and determining the indicated value, when using a mat that is laid on the bedding as an air circulation mat, Even if the attitude changes, the body surface temperature can be measured by at least one body surface temperature measurement unit, so the fan's airflow is automatically adjusted so that the user's body surface temperature approaches the target temperature. Can be controlled.

[Other Embodiments]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist.

  In each of the above embodiments, the case where the body surface temperature measuring unit is arranged on the surface of the upper cloth of the bag-like body in the air circulation type mat has been described. The back surface of an upper cloth may be sufficient and the predetermined location of the spacer which touches a body via an upper cloth may be sufficient. Further, the place where the body surface temperature measuring unit is arranged is not limited to the place where the body is in contact, but may be any place as long as the temperature approximates the body surface temperature can be measured.

  Moreover, although each said embodiment demonstrated the case where a thermistor was used as a body surface temperature measurement part, body surface temperature measurement means other than a thermistor can be used as a body surface temperature measurement part.

  In each of the above embodiments, the case where the variable resistor is used as the target temperature setting unit has been described. However, the target temperature setting unit is not limited to the variable resistor, and for example, two tact switches may be used. it can. In this case, when one tact switch is pressed, the set value increases, and when the other tact switch is pressed, the set value decreases. When a tact switch is used as the target temperature setting unit, means for processing information such as the number of times the tact switch is pressed and the pressing length is the target temperature conversion unit.

  Further, in each of the above embodiments, the case where the measurement temperature conversion unit and the target temperature conversion unit are provided in the main body circuit has been described. However, the measurement temperature conversion unit and the target temperature conversion unit are not provided in the main body circuit, but the measurement temperature The conversion unit may be integrated with the body surface temperature measurement unit, and the target temperature conversion unit may be integrated with the target temperature setting unit.

  In each of the above embodiments, the case where the measurement temperature conversion unit, the target temperature conversion unit, the measurement temperature conversion unit, the instruction calculation circuit, and the rotation speed control power circuit are independent circuits has been described. All or part of the integrated circuit may be integrally manufactured. For example, the instruction calculation circuit and the rotation speed control power circuit can be manufactured as one integrated circuit. In this case, the instruction value is a signal indicating the content of the instruction value generated inside the integrated circuit.

  Furthermore, in each of the above-described embodiments, the signal generation unit of the rotation speed control power circuit is configured by a microcomputer, and the signal output from the signal generation unit is converted into a low impedance signal as the power generation unit of the rotation speed control power circuit. After that, the case where a signal that performs a predetermined smoothing process on the converted signal is used has been described. However, an integrated circuit including an impedance conversion circuit and a smoothing circuit can be used as the rotation speed control power circuit. .

  In each of the above embodiments, the case where the signal generation unit of the rotation speed control power circuit is configured by a microcomputer has been described. However, the signal generation unit is not configured by a microcomputer, and negative feedback control is performed using an operational amplifier or an oscillation circuit. You may comprise by the circuit which performs.

  In each of the above embodiments, a case has been described where there is a predetermined correspondence between the indicated value and the duty ratio and amplitude of the pulse voltage applied to the fan. The contents of may be changed. For example, when the instruction value is small, it is possible to define a correspondence relationship that allows finer control of the fan air flow rate than when the instruction value is large.

  In each of the above embodiments, the second frequency is set to 0.305 Hz, and the second modulation means generates the second pulse signal with a period of 3.28 seconds. The case where the rotation / stop is repeated has been described. However, the second frequency may be set to a large value, for example, 2 Hz, as long as the processing by the smoothing circuit does not affect the second frequency. Thus, the rotation speed control power circuit can output a pulse voltage that allows the fan to perform substantially continuous low-speed rotation due to its inertia even when the indicated value is small.

  In the first embodiment described above, the case where a dry battery is used as the power supply device of the air circulation mat has been described. Of course, any power supply may be used as the power supply device. When a dry battery or the like is used as a power supply device, the voltage drops during use. However, as described above, since the air flow control device of the present invention has a negative feedback function, even if the voltage fluctuates. In the operating range, the air flow rate of the fan can be automatically controlled so that the temperature of the user's body surface approaches the target temperature.

  In the first embodiment, the case where one body surface temperature measuring unit is provided has been described, but a plurality of body surface temperature measuring units may be provided. Moreover, although said 2nd embodiment demonstrated the case where three body surface temperature measurement parts were provided, the body surface temperature measurement part may be provided with two or four or more as needed.

  Moreover, although each said embodiment demonstrated the case where the air circulation type mat was provided with one fan, the air circulation type mat may be provided with two or more fans. In this case, the air flow control device of the present invention supplies power to a plurality of fans.

  Furthermore, in each of the above-described embodiments, a heater may be provided at a predetermined portion of the air circulation type mat. In this case, for example, when the measured temperature-corresponding value is lower than the target temperature-corresponding value, the instruction calculation circuit outputs a signal for driving the heater to the rotation speed control power circuit, and the rotation speed control power circuit When a signal to drive the heater is received from the arithmetic circuit, power is supplied to the heater. Thereby, when the temperature measured by the body surface temperature measuring unit is lower than the target temperature, the measured temperature can be quickly raised to the target temperature using the heater. In addition, as a heater, the thing similar to what is used for the electric carpet marketed, for example can be used.

  In addition, in each of the above-described embodiments, the case where the temperature of the human body surface is adjusted using the air flow mat is described. However, the surface of the pet body such as a dog or a cat can be adjusted using the air flow mat. The temperature may be adjusted. Therefore, the “user” in this specification means not only a person but also a pet such as a dog or a cat.

  As described above, the air flow control device according to the present invention is configured so that the fan starts blowing when the user places the air flow type mat and the measured temperature corresponding value rises close to the target temperature corresponding value. The air flow rate of the fan can be automatically controlled so that the temperature corresponding value constantly approaches the target temperature corresponding value. Moreover, since the fan stops blowing when the user leaves the air circulation mat and the measured temperature corresponding value falls below the target temperature corresponding value, it is possible to prevent waste of the battery due to forgetting to turn off the power switch of the air circulating mat. Can do. Therefore, the present invention is suitable for use as an air flow rate control device that controls the air flow rate of a fan in an air circulation type mat.

1,1A Airflow Control Device 10 Storage Case 20, 20a, 20b, 20c Body surface temperature measuring unit (body surface temperature measuring means)
30 target temperature setting unit (target temperature setting means)
40 Main circuit 41 Measurement temperature conversion section (measurement temperature conversion means)
42 Target temperature conversion unit (target temperature conversion means)
43 instruction calculation circuit 44 rotation speed control power circuit 440 signal generation unit 441 clock unit 442 first frequency generation unit 443 second frequency generation unit 444 first modulation unit 445 second modulation unit 446 AND circuit (logical product circuit)
450 Power generation unit 451 Impedance conversion circuit (impedance conversion means)
452 Smoothing circuit (smoothing means)
DESCRIPTION OF SYMBOLS 50 Electric power input part 60 Electric power output part 81, 91 Input cable 82, 92 Output cable 100, 100A Air circulation type mat 110 Bag-shaped body 120 Spacer 130 Air circulation part 140 Fan (blower means)
150 Power supply 160 AC adapter

Claims (5)

An air flow control device for controlling the air flow of a fan in an air circulation type mat,
A body surface temperature measuring means disposed at a predetermined portion of the air circulation mat that is substantially in contact with the user's body surface;
A measurement temperature conversion means for converting the information of the body surface temperature measurement means into a measurement temperature corresponding value;
Target temperature setting means for setting a target temperature for the temperature of the user's body surface;
Target temperature conversion means for converting the information of the target temperature setting means into a target temperature corresponding value;
An instruction calculation circuit for calculating an instruction value from the measured temperature corresponding value and the target temperature corresponding value;
A rotational speed control power circuit for controlling power supplied to the fan according to the indicated value;
With
When the user puts on the air flow mat and the measured temperature corresponding value rises to near the target temperature corresponding value, the fan starts to blow, and during use, the measured temperature corresponding value becomes the target temperature corresponding value. Provided with a negative feedback function for controlling the air flow rate of the fan so as to constantly approach, and when the user leaves the air circulation mat and the measured temperature corresponding value falls below the target temperature corresponding value, the fan stops blowing An air flow control device characterized by:   2. The integrated circuit in which all or part of the measured temperature conversion means, the target temperature conversion means, the instruction calculation circuit, and the rotation speed control power circuit are integrally manufactured. Air flow control device. The rotational speed control power circuit includes:
First frequency generating means for generating a signal of the first frequency;
Second frequency generating means for generating a signal having a second frequency smaller than the first frequency;
A predetermined first correspondence relationship between the indicated value and the first duty ratio is determined in advance, and the first duty ratio corresponding to the indicated value output by the calculation means based on the first correspondence relationship And first modulation means for generating a first pulse signal having the determined first duty ratio by modulating a pulse width of the signal of the first frequency,
A predetermined second correspondence relationship between the instruction value and the second duty ratio is determined in advance, and the second duty ratio corresponding to the instruction value output by the calculation means based on the second correspondence relationship And second modulation means for generating a second pulse signal having the second duty ratio obtained by modulating the pulse width of the signal of the second frequency,
An AND circuit for outputting a third pulse signal obtained by taking the logical product of the first pulse signal and the second pulse signal;
Impedance conversion means for converting the third pulse signal into a low-impedance pulse voltage using a DC voltage input from the outside;
A predetermined duty ratio and a predetermined amplitude corresponding to the indicated value output by the arithmetic means are obtained by performing smoothing processing on a portion corresponding to the first pulse signal in the pulse voltage converted by the impedance conversion means. Smoothing means for generating and outputting the pulse voltage to the fan,
With
The first correspondence relationship is that the first duty ratio decreases from 100% to a predetermined value as the instruction value decreases from the maximum value to a predetermined switching value, and the instruction value decreases from the switching value to the minimum value. The first duty ratio is determined to remain at the predetermined value as the value decreases, and the second correspondence relationship is determined so that the second value corresponds to the second value as the instruction value decreases from a maximum value to the switching value. The duty ratio remains 100%, and the second duty ratio is determined to be reduced from 100% to 0% as the indicated value decreases from the switching value to the minimum value. The blower amount control device according to claim 1 or 2. A heater is provided at a predetermined portion of the air circulation mat,
The instruction calculation circuit, when the measured temperature corresponding value is lower than the target temperature corresponding value, outputs a signal to drive the heater to the rotation speed control power circuit,
4. The air flow rate according to claim 1, wherein the rotation speed control power circuit supplies power to the heater when receiving a signal to drive the heater from the instruction calculation circuit. Control device. The body surface temperature measuring means and a plurality of the measurement temperature conversion means corresponding to the body surface temperature measuring means are provided, and the instruction calculation circuit is the most of the plurality of measurement temperature correspondence values converted by the plurality of measurement temperature conversion means. The air flow rate control device according to claim 1, 2, 3, or 4, wherein the indicated value is determined using a high measured temperature corresponding value.

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