JP5181830B2 - Heater control device - Google Patents

Description

  The present invention relates to a temperature control of a heater, and more particularly to a control means effective for shortening a heater energization inspection time.

  Conventionally, this type of heater control device has a configuration shown in FIG. That is, the heater controller 101 has a heater 102 and a temperature control means 103, and an auxiliary heater 104 is arranged to heat the heater 2 from the outside when energizing the heater 102 and promote the temperature rise. It was.

The auxiliary heater 104 is driven and controlled via a drive control means 106 that responds to an output signal from the temperature detection means 5 of the heater 102, and further, the operating state of the heater controller 101 is determined based on the power supply state to the heater 102. Judgment means 107 for judging pass / fail is provided (for example, see Patent Document 1).
JP-A-9-219280

  However, in the conventional configuration, since the dedicated auxiliary heater 104 must be provided, the inspection apparatus becomes large, and it takes a lot of space and cost, and even if the auxiliary heater 104 is used, a certain heating time is required. As a result, it took time for inspection in a mass production line and had a problem that the production efficiency was lowered.

  The present invention solves the above-described conventional problems, is rational, and enables a heater energization inspection in a short time.

In order to solve the conventional problem, the heater control device of the present invention includes a heater, a temperature detection means, a temperature control means, and an operation start switch, and the temperature control means turns on the switch. The object to be heated is controlled by controlling the turning on / off operation of the heater by comparing the detected temperature obtained from the temperature detecting means with a predetermined target temperature. When the detected temperature exceeds the target temperature and the heater is not energized, the heater is forcibly energized for a predetermined time immediately after the switch is turned on regardless of the detected temperature. a configuration which, when the detected temperature exceeds the target temperature, when the temperature difference between the target temperature and the detected temperature is large, the short time period to force the current to the heater, if the temperature difference is small strong The set as the long time to put the heater manner, in which a configuration to automatically adjust the energization time of the heater in accordance with the temperature difference.

  As a result, even if the temperature of the place to be inspected is high, the heater is always energized, so that the energization inspection can be easily performed.

  The heater control device of the present invention can realize a reduction in inspection time and can also increase certainty. In addition, it is possible to automatically prevent the heater from excessively rising during the inspection, and to perform a safe audit. In addition, since the heater OFF operation can be confirmed with certainty, the failure detection rate can be improved.

The present invention includes a heater, a temperature detection means, a temperature control means, and an operation start switch. The temperature control means starts operation by turning on the switch, and is obtained from the temperature detection means. The target temperature to be heated is maintained at the target temperature by controlling the on / off operation of the energization to the heater by comparing the detected temperature with a predetermined target temperature, and the detected temperature is the target temperature. When the heater is not energized, the heater is forcibly energized within a predetermined time immediately after the switch is turned on, regardless of the detected temperature, and the detected temperature exceeds the target temperature. When the temperature difference between the target temperature and the detected temperature is large, the time for forcibly energizing the heater is set to a short time, and when the temperature difference is small, the time for forcibly putting the heater is set to a long time. In addition, by adopting a configuration that automatically adjusts the energization time of the heater according to the temperature difference, it is possible to prevent an excessive temperature rise according to the surrounding environment, so that the inspection can be performed more safely. I can do it.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows an example of application to a temperature control device that controls a heater, which is a heating means of a heating device, to maintain a predetermined temperature.

  In FIG. 1, a heater 1 functions as a heating means for heating and is controlled by a microcomputer 2 as a temperature control means. A power supply 4 is supplied by operating a switch 3 to start a temperature control operation.

  The microcomputer 2 has a timer that unconditionally energizes the heater 1 for a predetermined time after the switch 3 is turned on.

  The temperature detection means 5 is composed of a thermistor having a correlation between temperature and resistance value, and constitutes a voltage dividing circuit with the fixed resistor 6 so that the voltage input to the microcomputer 2 becomes a voltage value corresponding to the temperature. is there.

  Then, the microcomputer 2 converts this voltage into a digital value by a built-in AD converter, and further converts it into temperature information.

  If the temperature detected by the temperature detecting means 5 is lower than the control temperature, the microcomputer 2 outputs a signal for turning on the FET 7 and starts energizing the heater 1.

  When the heater 1 is energized and the temperature rises and reaches the control temperature, the microcomputer 2 turns off the FET 7 and turns off the heater 1.

  The operation and action of the heater control apparatus configured as described above will be described below with reference to the operation flow chart of FIG.

  First, when the switch 3 is turned on in step 1, the process proceeds to step 2, where the microcomputer 2 outputs a signal to the FET 7 to start the heating operation with the heater 1 energized, and at the same time, the timer of the microcomputer 2 starts timing.

  Next, in step 3, the timer time is checked. If the time T is not exceeded, the operation of waiting for the elapse of time T is repeated.

  When the time T is exceeded in step 3, the process proceeds to step 4 where the microcomputer 2 turns off the FET 7 and turns off the heater 1.

  The energization inspection of the heater 1 is possible because the heater 8 is energized from step 2 to step 4.

  As described above, in this embodiment, when the switch 3 is turned on, the heater 1 is forcibly started to be energized regardless of the temperature by the temperature detecting means 5, so that the season and air conditioning of the room to be inspected It is not affected by temperature fluctuations due to the equipment, and it is forced to energize for a short time by providing a timer, so there is almost no effect on normal operation and the inspection can be carried out reliably in a short time.

(Embodiment 2)
FIG. 3 shows a second embodiment in which the power supply 4 is divided by resistors 8 and 9 and input to the microcomputer 2. The microcomputer 2 converts it into a digital value by a built-in AD converter and further converts it into voltage information.

  In addition, the same code | symbol is attached | subjected to what has the effect | action same as the structure shown in FIG. 1, and the thing of Embodiment 1 is used for concrete description.

  The operation and action of the heater control device configured as described above will be described below with reference to the operation flow chart of FIG.

  First, when the switch 3 is turned on in step 5, the process proceeds to step 6 where the voltage of the power source 4 is acquired by the microcomputer 2.

  In step 7, this voltage is determined. If the voltage is equal to or lower than the predetermined voltage a, the microcomputer 2 turns on the FET 7 so that the heater 1 is forcibly energized regardless of the temperature detecting means 5.

This mode is an inspection-only mode, and the predetermined voltage a is also set lower than the normal use range, and the heater 1 is continuously energized. However, since the power is small, there is no excessive temperature rise.

  On the other hand, if the voltage of the power source 4 is in the normal use range in step 7, the process proceeds to step 9, where the temperature detection means 5 acquires the detected temperature, and in step 10, the detected temperature is compared with the target temperature.

  When the detected temperature is lower than the target temperature, the process proceeds to step 11 to start energization of the heater 1, and when the detected temperature is higher than the target temperature, the process proceeds to step 12 and the heater 1 is deenergized. In either case, the process proceeds to step 10 and the same operation is repeated to control the temperature to be constant at the target temperature.

  As described above, in the second embodiment, the system is started up in the test-only mode by setting the voltage of the power supply 4 to a voltage different from the normal voltage. At this time, the heater 1 is operated so as to be forcibly energized. As a result, the room to be inspected is not affected by temperature fluctuations due to the season or air conditioning equipment, and the inspection can be carried out reliably in a short time.

  In addition, since it is not necessary to provide a timer as in the first embodiment, it is not necessary to use a high-precision microcomputer 2, and it is possible to provide a heater control device that is low in cost and excellent in mass productivity.

(Embodiment 3)
FIG. 5 shows the third embodiment, and the configuration is the same as FIG.

  Hereinafter, operation | movement and an effect | action of the heater control apparatus of this Embodiment are demonstrated.

  When the switch 3 is turned on in step 13, the process proceeds to step 14, where the microcomputer 2 outputs a signal to the FET 7 to energize the heater 1 to start the heating operation, and at the same time, the timer starts measuring time, and further to the temperature detecting means 5 To obtain the detected temperature.

  Next, in step 15, a conversion consisting of the relationship between the difference between the detected temperature and the target temperature and the energization time as shown in FIG. 6 is performed, and the timer time period T is calculated from the acquired detected temperature.

  Thereafter, the timer time is checked in step 16, and if the timer does not exceed time T, the process returns to step 16 to repeat the operation of waiting for the elapse of time T.

  When the timer exceeds the time T, the process proceeds to step 17 where the microcomputer 2 turns off the FET 7 and turns off the heater 1.

  The energization inspection of the heater 1 is possible between steps 14-17.

  As described above, in the present embodiment, when the switch 3 is turned on, the heater 1 is forcibly started to energize regardless of the temperature by the temperature detecting means 5, and the energization time is the detected temperature and the target temperature. It is possible to adjust automatically according to the temperature difference between the two, and when the temperature is higher than the target temperature, the power is turned off more quickly. In addition, it is not affected by temperature fluctuations caused by air conditioning equipment, and since a forced energization is performed for a short time by providing a timer, there is almost no effect on normal operation, and the inspection can be carried out reliably in a short time.

(Embodiment 4)
FIG. 7 shows the fourth embodiment, and the configuration is the same as FIG.

  Hereinafter, operation | movement and an effect | action of the heater control apparatus of this Embodiment are demonstrated.

  When the switch 3 is turned on in step 18, the process proceeds to step 19, where the microcomputer 2 outputs a signal to the FET 7 to energize the heater 1, thereby starting the heating operation, and the timer starts measuring time, and further the temperature detecting means. In step 5, the detected temperature is acquired.

  Next, the process proceeds to step 20, where the timer time is checked. If the time T is exceeded, the process proceeds to step 22 and the heater 1 is deenergized. If the time T is not exceeded, the process proceeds to flow 21 to detect the detected temperature. Is compared with the second target temperature.

  If the second target temperature is exceeded, the routine proceeds to step 22 and the heater 1 is turned off. If the second target temperature is not exceeded, the routine returns to step 20 and the same operation is repeated until the timer time T. The energization inspection of the heater 1 is possible between the flows 19-22.

  The second target temperature is set to a temperature considerably higher than the target temperature in normal temperature control, and serves as a limiter that prevents an excessive temperature rise.

  As described above, in the present embodiment, when the switch 3 is turned on, the heater 1 is forcibly started to be energized regardless of the temperature by the temperature detecting means 5. It is not affected by temperature fluctuations, and is provided with a timer and forcedly energized for a short time, so there is almost no effect on normal operation and the inspection can be carried out reliably in a short time.

  Furthermore, since a limiter that cuts off the power to the heater 1 is provided even when the temperature rises excessively even within the timer time, a safer heater control device can be provided.

(Embodiment 5)
FIG. 8 shows the fourth embodiment. The configuration is basically the same as that in FIG. 1 except that the microcomputer 2 has first and second timers.

  Hereinafter, operation | movement and an effect | action of the heater control apparatus of this Embodiment are demonstrated.

  When the switch 3 is turned on in step 23, the process proceeds to step 24, and the first timer starts measuring time.

  Next, the time measured by the first timer is checked in step 25. If the time T1 is not exceeded, the process returns to step 25, and the operation of waiting for the elapse of time T1 is repeated.

  When the time T1 is exceeded in step 25, the process proceeds to step 26 where the microcomputer 2 outputs a signal to the FET 7 to energize the heater 1, thereby starting the heating operation and the timer starts measuring time.

  Next, the process proceeds to step 27, where the time measured by the second timer is checked. If the second timer does not exceed the time T2, the process returns to step 27 and the operation of waiting for the elapse of the time T2 is repeated. When the measured time T2 of the second timer is exceeded in step 27, the process proceeds to step 28 where the microcomputer 2 turns off the FET 7 and turns off the heater 1.

  An energization inspection of the heater 1 is possible between steps 26-28.

In addition, it is possible to confirm that the heater 1 is turned off during steps 24 to 26 during the first timer operation.

  As described above, in the present embodiment, when the operation switch 3 is turned on, the operation is started first from the operation of reliably turning off the heater energization. Therefore, it is possible to detect a failure in which the heater 1 is continuously turned on at the time of failure. I can do it.

  After that, since the heater 1 is forcibly started regardless of the temperature by the temperature detection means 5, it is not affected by the temperature fluctuations of the room to be inspected due to the season or air conditioning equipment, and a timer is provided. Since forced energization is performed only for a short time, there is almost no effect on normal operation, and the inspection can be carried out reliably in a short time.

  As described above, the heater control device according to the present invention relates to the inspection of the heater control device, and immediately after the operation is started, the heater can be forcibly energized regardless of the temperature control, or the inspection can be performed. Immediately after the start of operation, the heater is turned off for a certain period of time and then the heater is forcibly energized. The heater is energized for a short time so as not to cause an excessive temperature rise. It is possible to provide a heater control device capable of reliably inspecting in a short time.

Circuit block diagram of a heater control device showing Embodiment 1 of the present invention Operation flow diagram of heater control apparatus according to Embodiment 1 Circuit block diagram of a heater control device in Embodiment 2 of the present invention Operation flow diagram of heater control device in embodiment 2 Operation flow diagram of heater control apparatus according to Embodiment 3 of the present invention Explanatory drawing which showed the correlation with the difference of detection temperature of the heater control apparatus in Embodiment 3 of this invention, target temperature, and energization time Operation flow diagram of heater control apparatus according to Embodiment 4 of the present invention Operation flow diagram of heater control apparatus according to Embodiment 5 of the present invention Overview of conventional heater control device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heater 2 Temperature control means 3 Switch 5 Temperature detection means

Claims (1)

A heater, a temperature detection unit, a temperature control unit, and an operation start switch; the temperature control unit starts an operation by turning on the switch; The heating target is maintained at the target temperature by controlling the on / off operation of the energization to the heater by comparing with a predetermined target temperature, and the detected temperature exceeds the target temperature and the heater When the current is not energized, the heater is forcibly energized within a predetermined time immediately after the switch is turned on, regardless of the detected temperature, and when the detected temperature exceeds the target temperature, When the temperature difference of the detected temperature is large, the time for forcibly energizing the heater is set to a short time, and when the temperature difference is small, the time for forcibly putting the heater is set to a long time. Configuration and the heater control device for automatically adjusting the energization time of the heater according to the temperature difference.

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