JP2019082913A - Temperature control device and method - Google Patents

Abstract

To provide a temperature control device and method that is easy to implement a high-precision temperature control.SOLUTION: Based on a temperature signal representing a temperature received from a temperature sensor 2, a control device 10 of a temperature control device 1 outputs a first heater output signal representing a target output of a first heater 3 to a first power regulator 7. If the control device 10 determines that a low output state in which an output of the first heater 3 is equal to or lower than a lower limit threshold output higher by a constant first set output from a minimum output based on the temperature signal continues for a first predetermined time, then the control device outputs a second heater output reduction signal to a second power regulator 8, which represents that an output of a second heater 4 is lowered by a constant second set output, whereas if the control device determines that a high output state in which the output of the first heater 3 is equal to or higher than an upper limit threshold output which is lower by a constant third set output from a maximum output continues for a second predetermined time, then the control device outputs a second heater output reduction signal to the second power regulator 8, which represents that the output of the second heater 4 is increased by a constant fourth set output.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a temperature control device and method.

  As described in Patent Document 1, the durability and the like of the test object are generally tested in an environmental test room. The environmental test room can freely generate high temperature environment and low temperature environment suitable for the test contents. In the case of conducting a precision test, etc., the internal temperature of the environmental test room is controlled with high accuracy.

Unexamined-Japanese-Patent No. 2006-208328

  The following first and second reference devices 101 and 201 can be considered as devices for controlling the temperature in the environmental test chamber (the reference devices 101 and 201 are reference techniques and not prior art). Specifically, the first reference device 101 whose schematic configuration is shown in FIG. 5 includes a temperature sensor (TE) 102, a temperature indication controller (TIC) 112, a power regulator (SCR) 117, and a heater (EH) 104.

  The temperature sensor 102 is installed in the environmental test room 120, and the heater 104 is incorporated in the air conditioner 130. In the first reference device 101, the temperature indication controller 112 outputs a control signal 150 for controlling the power supplied to the heater 104 to the power regulator 117 based on the signal representing the room temperature received from the temperature sensor 102. Then, the power regulator 117 controls the power supplied to the heater 104 based on the control signal, and the heat released by the heater 104 is combined with the air by a fan (not shown) disposed in the air conditioner 130. It is made to flow into the environmental test chamber 120 in the direction indicated by the arrow B to stabilize the room temperature of the environmental test chamber 120. In the first reference device 101, since there is only one heater 104, it is necessary to increase the capacity of the heater 104 when the indoor load fluctuation of the environmental test room 120 becomes large. Therefore, in such a case, the temperature variation from the target temperature (set temperature) increases in proportion to the capacity, and it is difficult to perform precise temperature control.

  The second reference device 201 whose schematic configuration is shown in FIG. 6 is provided with two equal capacity first and second heaters 203 and 204 in order to improve the problem. Specifically, the second reference device 201 includes the same first and second control devices 250 and 270, and the first control device 250 includes the first temperature sensor 202, the first temperature indication controller 212, and the first power adjustment. The second controller 270 includes a second temperature sensor 222, a second temperature instruction controller 232, a second power regulator 208, and a second heater 204.

  The first and second temperature sensors 202 and 222 are disposed at different places in the environmental test chamber 220, and the first and second heaters 203 and 204 are incorporated in the same air conditioner 230. In the first control device 250, the first temperature adjustment controller 212 controls the power supplied to the first heater 203 based on the signal indicating the room temperature received from the first temperature sensor 202 as a first power adjustment Output to the signal generator 207. Then, based on the control signal, the first power regulator 207 controls the power supplied to the first heater 203 so that the room temperature of the environmental test chamber 220 matches the target temperature.

  Similarly, in the second control device 270, a control signal for controlling the power supplied to the second heater 204 based on the signal indicating the room temperature received from the second temperature sensor 222 by the second temperature instruction controller 232. Are output to the second power regulator 208. Then, based on the control signal, the second power regulator 208 controls the power supplied to the second heater 204 so that the room temperature of the environmental test chamber 220 matches the target temperature.

  Then, the heat released by the first and second heaters 203 and 204 is made to flow into the environmental test chamber 220 in the direction indicated by the arrow C together with the air by a fan (not shown) disposed in the air conditioner 230. The room temperature of the test chamber 220 is stabilized. In the second reference device 201, since the first and second control devices 250 and 270 which are the same device perform temperature control independently of each other, the capacity of the heaters 203 and 204 possessed by the respective control devices 250 and 270 is the first reference Compared to the heater 104 of the apparatus 101, the capacity can be about half. Therefore, the second reference device 201 may realize more precise temperature control.

  However, the second reference device 201 includes the first and second control devices 250 and 270 independent of each other and has two temperature sensors 202 and 222, and the two temperature sensors 202 and 222 are disposed at different positions. Ru. Therefore, for example, when precise temperature control of about ± 0.1 ° C. is required, the two temperature sensors 202 and 222 detect different temperatures due to local variations in room temperature, and one heater 203 While the control for raising the output is performed for (or 204), the control for decreasing the output for the other heater 204 (or 203) may be performed. Then, hunting occurs due to the operation of the heaters 203 and 204 as described above, so that the room temperature is not stable, and there is a possibility that temperature control with the obtained accuracy can not be performed.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a temperature control device and method that are easy to execute temperature control with high accuracy.

  In order to solve the above-mentioned subject, the temperature control device concerning the present invention adjusts the output of a temperature sensor, the 1st heater, the 2nd heater whose capacity is larger than the 1st heater, and the 1st heater. A first heater that represents a target output of the first heater based on a heater output regulator, a second heater output regulator that adjusts the output of the second heater, and a temperature signal that represents a temperature received from the temperature sensor An output signal is output to the first heater output regulator, and a low output state in which the output of the first heater is equal to or lower than the lower limit threshold output higher by a constant first set output from the minimum output is a first predetermined time If it is determined that the operation is continued, a second heater output reduction signal indicating that the output of the second heater is lowered by a fixed second set output is output to the second heater output regulator, while the first heater output reduction signal is output. Heater output is maximum The output of the second heater is increased by a constant fourth set output when it is determined that the high output state in which the output is higher than the upper limit threshold output lower by a constant third set output continues for a second predetermined time. And a controller for outputting a second heater output increase signal representing that to the second heater output regulator.

  In the present specification, the capacity of the heater is defined as the amount of heat generated from the heater when the heater is driven at the rated voltage (the upper limit of the voltage that can be stably used when using the heater).

  The first predetermined time and the second predetermined time may be the same time or different times. The first set output and the third set output may be the same output or different outputs. The second set output and the fourth set output may be the same output or different outputs.

  According to the present invention, the output of the large-capacity second heater can be increased and decreased stepwise by a fixed set output, and the temperature of the temperature measurement target can be roughly approximated to the target temperature (set temperature) . Further, in a state where the temperature of the temperature measurement target is close to the target temperature, the output of the small-capacity first heater can be accurately adjusted so that the temperature of the temperature measurement target becomes the target temperature. Furthermore, since the present invention requires only one temperature sensor and does not have a plurality of temperature control devices independent of each other, hunting does not occur and temperature instability may occur due to hunting. Absent. Therefore, it is easy to execute temperature control with high accuracy.

  Further, in the present invention, the control device receives the temperature signal from the temperature sensor and outputs the first heater output signal to the first heater output regulator, and the temperature instruction controller. If it is determined that the low output state continues for the first predetermined time based on the received first heater output signal, the second heater output reduction signal is output to the second heater output regulator, And a sequencer for outputting the second heater output increase signal to the second heater output regulator when it is determined that the high output state continues for the second predetermined time.

  According to the above configuration, the control device can be configured simply and inexpensively using existing equipment.

  In the present invention, each of the second set output and the fourth set output may be 40% or more and 60% or less of the capacity of the first heater.

  According to the above configuration, the output that fluctuates due to the stepwise increase and decrease of the second heater becomes about 50% of the capacity of the first heater, so the output fluctuation is caused when the stepwise increase and decrease of the second heater is performed. It does not become excessively large, and temperature fluctuations do not become large. Therefore, it is easy to effectively function the output adjustment of the small-capacity first heater after the output increase and decrease, and to perform precise temperature control.

  Further, in the present invention, when the second heater output regulator receives the second heater output step-down signal, the second heater output regulator gradually reduces the output of the second heater until the second set output is reduced, When the heater output increase signal is received, the output of the second heater is gradually increased until it increases by the fourth set output, and the second heater is substantially constant during the first predetermined time and the second predetermined time. Output may be performed.

  According to the above configuration, the temperature change per unit time can be reduced, and the temperature can be easily controlled precisely.

  In the present invention, the second heater output regulator instantaneously decreases the output of the second heater upon receiving the second heater output reduction signal, and the second heater output increase signal The second heater may increase the output of the second heater instantaneously by the fourth set output, and the second heater may perform a substantially constant output during the first predetermined time and the second predetermined time.

  According to the above configuration, it is possible to realize stepwise increase and decrease of the output with simple control.

  In the temperature control method according to the present invention, the output of the first heater whose capacity is smaller than that of the second heater is lower than the lower limit threshold output which is higher than the minimum output of the first heater by a constant first set output. While the output state continues for a first predetermined time, the output of the second heater is decreased by a fixed second set output when the temperature of the temperature measurement target is higher than the target temperature by the first predetermined temperature, The temperature of the temperature measurement target is the target when the high output state where the output of one heater is equal to or higher than the upper limit threshold output which is lower by a fixed third set output from the maximum output of the first heater continues for a second predetermined time The output of the second heater is increased by a constant fourth set output when the temperature is lower than the second predetermined temperature than the temperature.

  The first predetermined temperature and the second predetermined temperature may be the same temperature or different temperatures. Each of the first predetermined temperature and the second predetermined temperature may be any temperature greater than 0 ° C. When precise temperature control is performed, each of the first predetermined temperature and the second predetermined temperature can be set to, for example, about 0.1 ° C.

  According to the present invention, high-precision temperature control can be easily performed.

  In the temperature control method of the present invention, each of the second set output and the fourth set output may be 40% or more and 60% or less of the capacity of the first heater.

  According to the above configuration, it is easy to effectively function the output adjustment of the small capacity first heater after the output increase / decrease of the large capacity second heater, and it is easy to perform precise temperature control.

  According to the temperature control device and method of the present invention, it is easy to execute temperature control with high accuracy.

It is a schematic block diagram of the temperature control device concerning one embodiment of the present invention. It is a figure showing an example of the map memorize | stored in the memory | storage part (not shown) of the 1st power regulator of the said temperature control apparatus. It is a graph showing an example of the relation between time, room temperature, the output of the 1st heater, and each of the output of the 2nd heater. It is a graph showing the relation between the output of the 1st and 2nd heater of the temperature control device of a modification, and time. It is a schematic block diagram of a 1st reference device. It is a schematic block diagram of a 2nd reference apparatus.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. Where a plurality of embodiments, modifications and the like are included in the following, it is assumed from the beginning to construct new embodiments by appropriately combining the characteristic portions thereof.

  FIG. 1 is a schematic configuration diagram of a temperature control device 1 according to an embodiment of the present invention. As shown in FIG. 1, the temperature control device 1 includes a temperature sensor (TE) 2, a first heater (first EH) 3, a second heater (second EH) 4, and a first power as an example of a first output regulator. The controller (first SCR) 7, the second power regulator (second SCR) 8 as an example of the second output regulator, and the control device 10 are provided, and the control device 10 includes a temperature indication regulator (TIC) 12, and A sequencer (programmable logic controller: PLC) 14 is included.

  The temperature sensor 2 is installed in the environmental test room 20, and the first and second heaters 3 and 4 are incorporated in the air conditioner 30. The first heater 3 has a smaller capacity than the second heater 4. Further, the temperature instruction controller 12 executes high-precision temperature control by performing PID control on the first power regulator 7 based on the temperature signal representing the temperature (room temperature) in the environmental test chamber 20 from the temperature sensor 2 Do. In the PID control, the temperature indication controller 12 outputs a control signal in which a difference between a set value (target value) and a current value is proportionally (Proportional), integral (Integral) or derivative (Derivative).

  More specifically, the temperature indication controller 12 receives a signal representing the temperature (room temperature) in the environmental test room 20 from the temperature sensor 2, obtains the deviation between the room temperature and the target temperature (set temperature), and A control signal (current signal) having a current value of 4 mA or more and 20 mA or less is output to the first power regulator 7. The current signal of 4 mA or more and 20 mA or less is a transmission current signal specified for use in the IEC (International Electrotechnical Commission). The space in the environmental test room 20 is an example of a temperature measurement target.

  The temperature instruction controller 12 outputs a control signal (current signal) 50 of 4 mA or more and 20 mA or less to the first power regulator 7 based on the room temperature and the target temperature according to the signal from the temperature sensor 2. The temperature indication controller 12 outputs to the first power regulator 7 the control signal 50 of the current value which decreases linearly at 4 mA or more and 20 mA or less as the room temperature rises from the target temperature, and the room temperature is the target temperature And a control signal 50 of a current value that linearly increases at 4 mA or more and 20 mA or less is output to the first power regulator 7. If it is determined that the room temperature matches the target temperature, the control signal (current signal) 50 is made constant. The control signal (current signal) 50 constitutes a first heater output signal representing a target output of the first heater 3.

  FIG. 2 is a diagram showing an example of a map stored in a storage unit (not shown) of the first power regulator 7. The map shown in FIG. 2 is established within a range in which the output of the second heater 4 is constant and does not fluctuate. In FIG. 2, the vertical axis indicates the ratio of the output of the first heater 3 to the capacity (maximum output) of the first heater 3, and the horizontal axis indicates the temperature of the environmental test room 20 measured by the temperature sensor 2. Also, Tb represents a target temperature.

  In the example shown in FIG. 2, when the first power regulator 7 receives a control signal of 12 mA ((20 + 4) / 2) which is an intermediate current value from the temperature indicating controller 12, the first heater 3 has 50% of its capacity. Power for releasing the heat of% is supplied to the first heater 3. In addition, the first power regulator 7 sets the power at which the amount of heat released linearly increases from the heat of 50% as the current value of the control signal received from the temperature indication controller 12 increases from 12 mA as a first heater Supply to 3. In addition, the first power regulator 7 reduces the amount of heat released from the heat of 50% in a linear function as the current value of the control signal received from the temperature indication controller 12 decreases from 12 mA as a first heater Supply to 3. When the temperature measured by the temperature sensor 2 is lower than or equal to the lower limit threshold Ta, the first heater 3 releases the amount of heat of the maximum output. In addition, when the temperature measured by the temperature sensor 2 is equal to or higher than the upper limit threshold Tc, the first heater 3 stops the output. When the temperature T is in the range of Ta ≦ T ≦ Tc, the output of the first heater 3 decreases linearly as the temperature rises, and the rate of change of the decrease is constant.

  The sequencer 14 receives the first heater output signal, and outputs a control signal to the second power regulator 8 based on the first heater output signal. Specifically, the sequencer 14 determines, based on the first heater output signal, a low output state in which the output of the first heater 3 is equal to or lower than the lower limit threshold output higher by a constant first set output from the minimum output for a first predetermined time If it is determined that the operation is continued, a second heater output reduction signal indicating that the output of the second heater 4 is lowered by a constant second set output is output to the second power regulator 8. Also, the sequencer 14 continues the second predetermined time in the high output state in which the output of the first heater 3 is equal to or higher than the upper limit threshold output which is lower by a constant third set output from the maximum output based on the first heater output signal. If it is determined that the second power regulator 8 outputs a second heater output increase signal representing that the output of the second heater 4 is increased by a constant fourth set output, the second power regulator 8 is output.

  The second power regulator 8 transmits to the second heater 4 the power at which the second heater 4 releases the heat of the target output based on the second heater output signal representing the target output of the second heater 4 received from the sequencer 14 Supply. The second heater output reduction signal is a second heater output signal that is output when the low output state continues for a first predetermined time, and the second heater output increase signal is a second predetermined high output state. It is a second heater output signal that is output when the time continues. The air warmed by the heat released from the first and second heaters 3 and 4 flows in the direction indicated by the arrow A by the drive of a fan (not shown) disposed in the air machine 30 and enters the environmental test chamber 20 Released. The room temperature of the environmental test room 20 is controlled by the release of this air.

  FIG. 3 is a graph showing an example of the relationship between time and the room temperature, the output of the first heater 3 and the output of the second heater 4.

  In the example shown in FIG. 3, the room temperature starts to rise from the target temperature at time ta, and the output of the first heater 3 gradually decreases correspondingly. Then, at the time tb, the output of the first heater 3 is in the low output state where the output is the minimum value (for example, the state of the output 0), and the low output state is maintained until the time tc. In the period from time tb to time tc, the temperature indication controller 12 continuously outputs the control signal of 4 mA to the first power regulator 7. In the period from time tb to time tc, the second heater 4 performs substantially constant output.

  The low output state is a state in which the output of the first heater is equal to or lower than the lower limit threshold output which is higher than the minimum output by a constant first set output, and the current output from the temperature indication controller 12 is It is a state in which the value is equal to or less than the value of the current signal corresponding to the lower limit threshold output. In the example shown in FIG. 3, the first set output is set to 0 kW, but the first set output may be set to a positive value larger than 0 kW. For example, the first set output can be set to 5%, 3%, 2%, etc. of the maximum output of the first heater. The temperature indicating controller 12 may output a current signal having a slight fluctuation (fluctuation). The first set output is preferably set to an output value corresponding to a value slightly larger than the maximum fluctuation width in the current signal of the temperature indicating controller, for each specification.

  The time from time tb to time tc coincides with the first predetermined time. The sequencer 14 determines that the low output state has continued for a first predetermined time at time tc, and outputs a second heater output reduction signal to the second power regulator 8. The first predetermined time may be set to any time including 0 hour, and may be set to, for example, 2 minutes, 1 minute, 30 seconds, 20 seconds, or 10 seconds. The second power regulator 8 causes the second heater 4 to gradually decrease the output of the second heater 4 by a fixed second set output P between time tc and time td based on the second heater output step-down signal. Control the power supplied to the Although the magnitude of the second set output P is not limited, the second set output P is preferably equal to or less than the capacity of the first heater, and more preferably 30% to 70% of the capacity of the first heater. Most preferably, it is 40 to 60 of the capacity of the first heater.

  The room temperature stops rising at time td, and turns down at time td. The room temperature substantially matches the target temperature at time te, and further gradually decreases with the passage of time. The output of the first heater 3 gradually rises with the passage of time from time td when the room temperature turns to fall. Then, at time tf, the first power regulator 7 receives the control signal of 20 mA from the temperature instruction controller 12 and supplies the first heater 3 with the power at which the first heater 3 becomes the maximum output. In other words, at time tf, the output of the first heater 3 is in the high output state where the output is at the maximum value, and the high output state is maintained until time tg. In the period from time tf to time tg, the temperature indication controller 12 continuously outputs the control signal of 20 mA to the first power regulator 7. In addition, in the period from time tf to time tg, the second heater 4 performs substantially constant output.

  The high output state is a state in which the output of the first heater is equal to or higher than the upper limit threshold output which is lower than the maximum output by a constant third set output, and the current output from the temperature indication controller 12 is It is a state in which the value is equal to or more than the value of the current signal corresponding to the upper limit threshold output. Although the third set output is set to 0 kW in the example shown in FIG. 3, the third set output may be set to a positive value larger than 0 kW. For example, the third set output can be set to 5%, 3%, or 2% of the maximum output of the first heater. The temperature indicating controller 12 may output a current signal having a slight fluctuation (fluctuation). The third set output is preferably set to an output value corresponding to a value slightly larger than the maximum fluctuation width in the current signal of the temperature indicating controller, for each specification. In addition, the third setting output may be set to the same value as the first setting output or may be set to a different value.

  The time from time tf to time tg coincides with the second predetermined time. The sequencer 14 determines that the high output state has continued for a second predetermined time at time tg, and outputs a second heater output increase signal to the second power regulator 8. The second predetermined time may be set to any time including 0 hour, and may be set to, for example, 2 minutes, 1 minute, 30 seconds, 20 seconds, or 10 seconds. The second power regulator 8 causes the second heater 4 to gradually increase the output of the second heater 4 by a constant fourth set output P from time tg to time th based on the second heater output increase signal. Control the power supplied to the

  There is no limitation on the magnitude of the fourth setting output P, but it is preferable that the fourth setting output P is equal to or less than the capacity of the first heater 3 and 30% to 70% of the capacity of the first heater 3 More preferably, it is 40 to 60 of the capacity of the first heater 3. In the example shown in FIG. 3, the second set output and the fourth set output are both outputs P and match, but the second set output and the fourth set output may be set to different values. . The second predetermined time may be set to the same time as the first predetermined time or may be set to a different time. Further, the time required to increase the output of the second heater 4 by the fourth set output may be set to the same time as the time required to reduce the output of the second heater 4 by the second set output. It may be set to time.

  In the period from the time th to the time ti, the temperature indicating controller 12 continuously outputs the control signal of 20 mA to the first power regulator 7. In addition, in the period from time th to time ti, the second heater 4 performs a substantially constant output. The time from the time th to the time ti coincides with the second predetermined time. The sequencer 14 determines that the high output state has continued for a second predetermined time at time ti, and outputs a second heater output increase signal to the second power regulator 8. The second power regulator 8 supplies the second heater 4 so that the output of the second heater 4 gradually increases by the fourth set output P between time ti and time tj based on the second heater output increase signal. Control the power. After time tj, the room temperature gradually rises and recovers to approximately the target temperature at time tk.

  In the example shown in FIG. 3, the low output state in which the output of the small capacity first heater 3 is equal to or less than the lower limit threshold output higher by the first set output than the minimum output of the first heater 3 continues for the first predetermined time. The output of the second heater 4 is reduced by the second set output when the temperature (room temperature) of the indoor space as an example of the temperature measurement target is equal to or higher than the target temperature and the first predetermined temperature. In addition, the room temperature is higher than the target temperature in a state where the high output state in which the output of the first heater 3 is equal to or higher than the upper limit threshold output which is lower than the maximum output of the first heater 3 by the third set output continues for a second predetermined time. When the temperature is equal to or lower than the second predetermined temperature, the output of the second heater 4 is increased by the fourth set output. Each of the first and second predetermined temperatures can be set, for example, to a temperature of about 0.1 ° C. when performing precise temperature control. However, each of the first and second predetermined temperatures may be set appropriately for each specification, and can be set to, for example, 10 ° C., 5 ° C., 3 ° C., 2 ° C., or 0.5 ° C. The first predetermined temperature and the second predetermined temperature may be the same temperature or different temperatures.

  According to the above embodiment, the output of the large-capacity second heater 4 can be increased and decreased stepwise by a constant set output, and the temperature of the chamber can be roughly approximated to the target temperature (set temperature). . Further, in a state where the temperature of the chamber is close to the target temperature, the output of the small-capacity first heater 3 can be adjusted with high accuracy so that the temperature of the chamber becomes the target temperature. Further, since the temperature control device 1 requires only one temperature sensor 2 and does not have a plurality of temperature control devices independent of each other, hunting does not occur, and the temperature becomes unstable due to hunting. It will never be. Therefore, it is easy to execute temperature control with high accuracy.

  In the second heater 4, each of the second set output to be stepped down and the fourth set output to be stepped up may be 40% or more and 60% or less of the capacity of the first heater 3.

  According to the above configuration, the output that fluctuates due to the stepwise increase and decrease of the second heater 4 becomes about 50% of the capacity of the first heater 3. The output fluctuation does not become excessively large, and the temperature fluctuation does not become large. Therefore, it is easy to effectively function the output adjustment of the small-capacity first heater 3 after the output increase and decrease, and to perform precise temperature control.

  Furthermore, the second power regulator 8 gradually decreases the output of the second heater 4 until it decreases by the second set output when receiving the second heater output reduction signal, while the second heater output increase signal When received, the output of the second heater 4 may be gradually increased until it increases by the fourth set output.

  According to this configuration, the temperature change per unit time can be reduced, which is preferable because the temperature can be accurately controlled.

  The present invention is not limited to the above-described embodiment and the modifications thereof, and various improvements and modifications can be made within the scope of the matters described in the claims of the present application and the equivalents thereof.

  For example, in the above embodiment, when the second power regulator 8 receives the second heater power reduction signal, it gradually reduces the output of the second heater 4 until it decreases by a fixed second set output, while the second power regulator 8 The case has been described where the output of the second heater 4 is gradually increased until it increases by a constant fourth set output when the heater output increase signal is received.

  However, as shown in FIG. 4, that is, in the temperature control device of the modification, the graph showing the relationship between the output of the first and second heaters and the time, the low power state is the first in the first heater (first EH). If the second heater output regulator receives the second heater output reduction signal continuously for one predetermined time tl, the output of the second heater (second EH) is instantaneously reduced by the constant second set output P '. May be Although not shown, in the first heater, when the high output state continues for the second predetermined time and the second heater output regulator receives the second heater output increase signal, the output of the second heater is instantaneously fixed. The fourth set output of may be increased. According to this configuration, it is possible to realize stepwise increase and decrease of the output with simple control.

  In addition, although the case where the control device 10 performs PID control has been described, the control device may perform control other than PID control. For example, control that is not proportional to the difference between the set value (target value) and the current value You may go. Also, although the case has been described where the temperature indication controller 12 outputs a current signal of 4 mA or more and 20 mA or less specified by IEC, the temperature indication controller 12 is a DC signal other than 4 mA to 20 mA, for example, 0 to 10 mA A direct current signal or the like may be output, or an alternating current signal may be output. In addition, although the first and second heater power regulators are described as being the first and second power regulators 7 and 8, at least one of the first and second heater power regulators has the first and second power regulators. (2) A current regulator such as a DC driver may be configured to adjust the current flowing to the heater. Moreover, although the case where the control apparatus 10 contained the temperature indication controller 12 and the sequencer 14 which were separate bodies mutually was demonstrated, the control apparatus may be comprised by integral computer. Further, the case where the first and second heaters 3 and 4 are disposed in the air conditioner 30, and the air warmed by the first and second heaters 3 and 4 is introduced into the environmental test chamber 20 by a fan has been described. However, the first and second heaters may be disposed directly in the room.

  The point is that the control device of the temperature control device can output the first heater output signal representing the target output of the first heater to the first heater output regulator based on the temperature signal representing the temperature received from the temperature sensor. I hope there is. Further, the control device of the temperature control device is configured such that, based on the temperature signal, the low output state in which the output of the first heater is equal to or less than the lower limit threshold output higher by a constant first set output from the minimum output is a first predetermined time If it is determined that the operation is continued, a second heater output reduction signal indicating that the output of the second heater is lowered by a fixed second set output is output to the second heater output regulator, while the output of the first heater If it is determined that the high power state where the upper limit threshold output is lower than the maximum output by a constant third set output continues for a second predetermined time, the output of the second heater is increased by a constant fourth set output. The second heater output increase signal may be output to the second heater output regulator.

  Although the case where the temperature measurement target is a room (space) and the room temperature is adjusted by the first and second heaters 3 and 4 has been described, the temperature measurement target may be an object, and The temperature of the object may be adjusted by the second heater.

  1 temperature controller, 2 temperature sensor, 3 first heater, 4 second heater, 7 first power regulator, 8 second power regulator, 10 controller, 12 temperature indicating controller, 14 sequencer, 20 environmental test room , 30 air conditioners, 50 control signals.

Claims (7)

Temperature sensor,
A first heater,
A second heater having a larger capacity than the first heater;
A first heater output regulator for adjusting the output of the first heater;
A second heater output regulator for adjusting the output of the second heater;
Based on a temperature signal representing a temperature received from the temperature sensor, a first heater output signal representing a target output of the first heater is output to the first heater output regulator, and further, an output of the first heater is If it is determined that the low output state in which the minimum output is lower than the lower limit threshold output which is higher by a constant first set output continues for a first predetermined time, the output of the second heater is lowered by a fixed second set output. Output the second heater output reduction signal representing that to the second heater output regulator, while the output of the first heater is equal to or higher than the upper limit threshold output which is lower by a certain third set output from the maximum output When it is determined that the high output state continues for a second predetermined time, a second heater output increase signal indicating that the output of the second heater is increased by a constant fourth set output is used as the second heater output regulator Output to And a control device,
Temperature control device comprising: In the temperature control device according to claim 1,
The controller is
A temperature indicating controller that receives the temperature signal from the temperature sensor and outputs the first heater output signal to the first heater output regulator;
If it is determined that the low output state continues for the first predetermined time based on the first heater output signal received from the temperature instruction controller, the second heater output reduction signal is output as the second heater output. A sequencer for outputting the second heater output increase signal to the second heater output regulator when outputting to the regulator and determining that the high output state continues for the second predetermined time;
Temperature control device. In the temperature control device according to claim 1,
The temperature control device, wherein each of the second set output and the fourth set output is 40% or more and 60% or less of the capacity of the first heater. In the temperature control device according to claim 1,
The second heater output regulator gradually decreases the output of the second heater until the second set output is reduced when the second heater output reduction signal is received, while the second heater output increase signal When received, the output of the second heater is gradually increased until it increases by the fourth set output,
The temperature control device, wherein the second heater performs a substantially constant output during the first predetermined time and the second predetermined time. In the temperature control device according to claim 1,
The second heater output regulator instantaneously decreases the output of the second heater when the second heater output reduction signal is received, and when the second heater output increase signal is received, the second heater The temperature control device, wherein the output of the second heater is instantaneously increased by the fourth set output, and the second heater performs a substantially constant output during the first predetermined time and the second predetermined time.   In a state where the low output state in which the output of the first heater whose capacity is smaller than that of the second heater is equal to or less than the lower limit threshold output higher by a fixed first set output from the minimum output of the first heater continues for a first predetermined time The output of the second heater is decreased by a fixed second set output when the temperature of the temperature measurement target is equal to or higher than the first predetermined temperature above the target temperature, while the output of the first heater is the maximum of the first heater. When the temperature of the temperature measurement target is lower than the target temperature by a second predetermined temperature while the high output state where the output is higher than the upper limit threshold output which is lower than the output by a predetermined third set output continues for a second predetermined time The temperature control method, wherein the output of the second heater is increased by a constant fourth set output. In the temperature control method according to claim 6,
The temperature control method, wherein each of the second set output and the fourth set output is 40% or more and 60% or less of the capacity of the first heater.

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