JPH08171426A - Heating part temperature controller - Google Patents

Abstract

PURPOSE: To decide the presence or absence of disconnection at a heating part by setting a prescribed target temperature and a time needed to reach the target temperature and estimated when a normal operation state is assumed and then controlling the current-carrying state set to the heating part based on the heating part temperature information. CONSTITUTION: An AC energization current detection part 11 is connected between an AC application drive part 3 and a heating part 2, and the AC energizing current presence information 12 on the part 2, i.e., being the output of the part 11 is inputted to a temperature control part 5. The information 12 outputs the signals of H and L levels to the part 5 when a current flows and does not flow respectively. The part 5 decides the time needed to reach a target temperature and set based on the AC voltage level information 10 and the heating part temperature information 7 and also decides the abnormality of a heating part temperature controller based on the result of comparison performed between the detected temperature and an abnormal temperature set previously. Then the part 5 detects the disconnection of the part 2 based on the information 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat generating portion temperature control device for controlling a temperature by applying and driving an AC current or the like to a heat generating portion constituted by an AC load or the like.

[0002]

2. Description of the Related Art Conventionally, a fixing device for a copying machine or a printer has been known as a device for applying and driving an AC current to a heat generating portion composed of an AC load to control the temperature. FIG. 4 is a block diagram of a heat generating portion temperature control device having the simplest configuration in such a conventional fixing device.

As shown in FIG. 4, an AC current is supplied from a primary AC power source 1 to a heat generating section 2 composed of an AC load through an AC applying drive section 3 such as a triac as a drive means to generate heat. The temperature of the section 2 is input to the temperature control section 5 such as a CPU as the heating section temperature information 7 by the temperature detecting means 4 such as a thermistor installed adjacent to the heating section 2. In the temperature control unit 5, the preset target temperature and abnormal temperature and the heat generation unit temperature information 7 input as described above are input.
The energization control signal 6 is generated by comparing with the detected temperature of the heat generating portion obtained from
The temperature is controlled so that the temperature of the heat generating portion 2 reaches the above target temperature by inputting it to the C application driving portion 3.

The temperature control by the temperature control unit 5 will be described in detail with reference to the flowchart of FIG. As shown in FIG. 5, first, in order to detect the temperature of the heat generating portion 2, temperature sensing is performed to take in the heat generating portion temperature information 7 output from the temperature detecting means 4 (step S5-1), and the detection obtained from the information is performed. A comparison judgment is made between the temperature and a preset abnormal temperature (step S5-2). If it is determined that the detected temperature is an abnormal temperature, error processing is performed (step S5-6). If it is determined that the detected temperature is not the abnormal temperature, the detected temperature and the preset target temperature are set. Are compared and determined (step S5-3). As a result, when the detected temperature is lower than the target temperature, the AC current is applied (step S5-4), and when the detected temperature is higher than the target temperature, the AC current is applied.
The application of the electric current is stopped (step S5-5), and the heating unit 2
The temperature of is controlled to approach the target temperature. Hereinafter, the above control is repeated (step S5-4 or S5-5 to step S5-1).

When an AC current is applied, the energization control signal 6 is input to the AC application drive unit 3 as an energization permission level to energize the heating unit 2 with the AC current.
When the application of the C current is stopped, the energization control signal 6 is set to the energization stop level and is input to the AC application drive unit 3 so that the AC current is not supplied to the heat generating unit 2.

The error processing shown in FIG. 5 is similar to that shown in FIG.
As shown in the flowchart of FIG. 7, after stopping the application of the AC current (step S6-1), the process of terminating the heat generation unit temperature control without performing temperature sensing, or as shown in the flowchart of FIG. After the application is stopped (step S7-1), the temperature control unit 5 indicates that an error has occurred in the heat generation unit temperature control operation as temperature control error information 8 on the display unit (not shown) of the device including the temperature control unit 5. The temperature control error is displayed on the display unit, and an error notification is sent to an external device (not shown) (step S7-2) to end the operation of the heat generation unit temperature control.

Next, another conventional example will be described. The above-mentioned conventional example is an example of the heat generating unit temperature control device in the case where the target temperature is single, but in a device having a large heat capacity of the heat generating unit, a plurality of target temperatures may be set. In general, a heat-generating-part temperature control device having a plurality of target temperatures is a device in which the final target temperature is high or the time required to reach the target temperature is long. It is important to judge whether the control device is operating normally.

Hereinafter, based on the flowchart of FIG.
The temperature control of the conventional device having such a plurality of target temperatures will be described.

In this example, the first target temperature is first set (step S8-1), but if the time required from the start of energization of the heat generating portion 2 to the first target temperature is too long, it is normal. Since it is considered that the normal operation is not performed, the time required to reach the first target temperature, which is allowable as the normal operation, is set as the reference time (step S8-2). Then, after the timer in the reset state is started (step S8-3), temperature sensing and abnormal temperature determination and error processing are performed by the same procedure and method as the conventional example shown in FIG. 5 (step S8-4). ~ S8-5 ~ S
8-6).

Next, the target temperature set as described above and the detected temperature obtained from the heat generation part temperature information 7 are compared and determined (step S8-7). If the detected temperature is less than the target temperature, After applying the AC current by the same procedure and method as the conventional example shown in FIG. 5 (step S8-
8), it is determined whether or not a timeout has occurred (step S8).
-9). That is, the set reference time and the value of the timer at that time are compared and determined, and when the value of the timer at that time exceeds the set reference time, it is determined that time-out has occurred and the error processing as described above is performed (step S8- 9-S
8-6), if not exceeded, the operation from the temperature sensing is repeated as it is not time-out (step S).
8-9 to S8-4).

As a result of comparing and determining the target temperature and the detected temperature (step S8-7), if the detected temperature is equal to or higher than the target temperature, the AC current is determined by the same procedure and method as the conventional example shown in FIG. After the application of the voltage is stopped (step S8-1
0) and reset the timer (step S8-
11), the process returns to the first process to set the next target temperature (steps S8-11 to S8-1), and the above-described series of operations is repeated thereafter.

The second target temperature setting (step S
In 8-1), the second target temperature higher than the first target temperature is set, and the arrival time to the second target temperature that can be allowed as normal operation is set as the second reference time (step). S8-2). In this way, the same operation is repeated until the Nth target temperature which is the final target temperature is reached.

By the control as described above, the temperature of the heat generating portion can be maintained at the high final target temperature while preventing the occurrence of accidents such as ignition.

As an improved example of this conventional example, as shown in FIG. 9, the application of the AC current is not stopped until the detected temperature reaches the final target temperature. That is, the detected temperature obtained from the heat generation part temperature information 7 and the final target temperature are compared and determined (step S9-1).
0), if the final target temperature has not been reached, the timer is reset (step S9-12), and the process returns to the first process to set the next target temperature (step S9-12).
9-12 to S9-1), and the series of operations described above is repeated thereafter. When the final target temperature is reached, the AC
The application of current is stopped (step S9-11), the timer is reset thereafter (step S9-12), and the series of operations described above is repeated to maintain the final target temperature. It should be noted that the procedure and method of the processing whose description is omitted in the flowchart of FIG. 9 are the same as those of the above-described conventional example.

By controlling in this way, A
It is possible to efficiently control the temperature of the heat generating portion without stopping the application of the C current.

Further, as another conventional example, as shown in FIG. 10, temperature sensing is performed immediately after the operation is started by the same procedure and method as those of the above-mentioned conventional example (step S10-1), and the temperature is obtained from the heat generating part temperature information 7. Since the target temperature can be set by excluding the target temperature lower than the detected temperature that is detected, it is possible to perform the heat generation part temperature control and the error processing in a shorter time. It should be noted that the procedure and method of the processing whose description is omitted in the flowchart of FIG. 10 are the same as those of the conventional example described above.

However, according to the above-described conventional heat-generating-part temperature control device, the target temperature is controlled by the minimum voltage level of the primary AC power supply 1 that can be allowed as a device without detecting the voltage level of the primary AC power supply 1. Since the arrival time to the target temperature was set, it was not possible to appropriately set the arrival time to the target temperature in response to the change in the heat generation amount of the heat generating section 2 depending on the voltage level of the primary AC power supply 1.

Therefore, as shown in FIG. 11, for example, an AC power supply voltage level detecting unit 9 composed of a plurality of resistors, a comparator and an internal reference voltage generating unit is provided as the power supply voltage level detecting means, and the output thereof is provided. It has been proposed to input the AC power supply voltage level information 10 into the temperature control unit 5. In this example, the AC power supply voltage level detection unit 9
Converts the voltage level of the primary AC power supply 1 into AC-DC and level, and outputs it as AC power supply voltage level information 10. Then, in the temperature control unit 5, the target temperature and the primary AC power source are determined by the heat generating unit temperature information 7 output from the temperature detecting unit 4 and the AC power source voltage level information 10 output from the AC power source voltage level detecting unit 9. The arrival time of the target temperature according to the voltage level of 1 is set.

FIG. 12 shows a flow chart of this conventional temperature control. As shown in FIG. 12, in this conventional example,
An AC power supply voltage level sensing routine is added. First, the AC power supply voltage level sensing is performed immediately after the start of the apparatus, and the AC power supply voltage level information 10 output from the AC power supply voltage level detection unit 9 is fetched (step S12-1). Then, after temperature sensing is performed by the same procedure and method as the above-described conventional example (step S12-2) and the target temperature is set (step S12-3), the target temperature is determined based on the AC power supply voltage level information 10. The arrival time is set (step S12-4). The subsequent processing is the same as that of the conventional example shown in FIG.

The arrival time is set in this conventional example based on the relationship between the temperature of the heat generating portion and the arrival time to the target temperature according to the AC power supply voltage level shown in FIG. In FIG. 13, Vtyp is the standard AC power supply voltage level, 1.2Vtyp (Vmax) is the highest AC power supply voltage level, 0.8Vtyp (Vmin) is the lowest AC power supply voltage level, and 1.1Vtyp is the standard AC power supply voltage level Vt.
AC power supply voltage level 1.1 times yp, 0.9 Vtyp
Indicates an AC power supply voltage level 0.9 times the standard AC power supply voltage level Vtyp.

Further, Te is an abnormal temperature of the heat generating part, Tr is a room temperature, T1 is a first target temperature of the heat generating part, T2 is a second target temperature of the heat generating part, and Tt is a final target temperature which is a target temperature of the third heat generating part. , Tr1 (max) has an AC power supply voltage level of 1.2.
In the case of Vtyp, from the room temperature Tr to the first heating portion target temperature T
1, the allowable arrival time before reaching 1, tr1 (1.
1) is an allowable arrival time from the room temperature Tr to the first heating portion target temperature T1 when the AC power supply voltage level is 1.1 Vtyp, and tr1 (typ) is the room temperature when the AC power supply voltage level is Vtyp. Allowable arrival time from Tr to reaching the first heat generating part target temperature T1, tr
1 (0.9) is an allowable arrival time from the room temperature Tr to the first heating portion target temperature T1 when the AC power supply voltage level is 0.9 Vtyp, and tr1 (min) is AC
This is an allowable time for the room temperature Tr to reach the first heating unit target temperature T1 when the power supply voltage level is 0.8 Vtyp.

For example, when the AC power supply voltage level sensing detects that the AC power supply voltage level is 0.8 Vtyp, the time required to reach the first target temperature T1 is tr.
The temperature control as described above is performed with 1 (min), and AC
When it is detected that the power supply voltage level is 1.2 Vtyp, the arrival time of the first target temperature T1 is set to tr1 (ma
The temperature control as described above is performed as x).

On the other hand, in the conventional example shown in FIGS. 8 to 10, the AC power supply voltage level is 0.8 Vtyp (Vm
Since the temperature control is performed as (in), when the energization from the room temperature Tr is started with the arrival time of the third target temperature Tt set to trt (min), when the temperature detection unit 4 is not operating normally, Actual AC power supply voltage level is 0.8
If it is Vtyp (Vmin), the temperature of the heat generating portion is Tt even at the time of timeout, but if the actual AC power supply voltage level is 1.2 Vtyp (Vmax), the temperature of the heat generating portion at the time of timeout becomes the abnormal temperature Te. There was a risk of causing an accident such as a fire. Further, the temperature detecting means 4
Does not operate normally and the abnormal temperature cannot be detected accurately, the actual AC power supply voltage level is 1.2Vtyp.
When the value is (max), the temperature may be higher than the abnormal temperature in a short time, which is dangerous.

However, according to the conventional example shown in FIG.
The above points are improved by setting the arrival time to the target temperature of the heat generating portion using the AC power supply voltage level as a parameter.

[0025]

However, in the above-mentioned conventional example, the abnormal temperature is determined by the heat generating portion temperature information 7, and the arrival time to the target temperature is determined based on the AC power supply voltage level information 10 and the heat generating portion temperature information 7. Since only the heat-generating unit temperature control device is determined based on the above-mentioned determination, there is a problem that the wire breakage of the heat-generating unit 2 and the failure of the AC application drive unit 3 cannot be detected.

The first invention according to the present application solves the above-mentioned problems, and whether the temperature control loop of the heat generating portion is operating correctly even for the heat generating portion whose heat generating efficiency greatly changes depending on the AC power supply voltage level. An object of the present invention is to provide a heat generating part temperature control device capable of determining whether or not there is a disconnection of a heat generating part or a failure of an AC application driving part while determining whether or not the heat generating part is in a short time.

Further, in addition to the above object, the second invention of the present application aims at providing a heating portion temperature control device capable of preventing an accident such as ignition when an abnormality of the device is detected. .

Further, in addition to the above object, the third invention according to the present application is a temperature control device for a heating portion capable of promptly transmitting an abnormality of the device to a user of the device or an external device connected to the device. Is intended to provide.

[0029]

According to the first invention of the present application, the above object is to provide a temperature detecting means installed adjacent to a heat generating portion that generates heat when energized, and to apply a current to the heat generating portion. What is claimed is: 1. A heating part temperature control device comprising: a driving means for biasing; a power supply voltage level detection means for detecting a power supply voltage level; and a temperature control means, wherein the temperature control means outputs the heat generation part. Based on the temperature information and the power supply voltage level information output from the power supply voltage level detection means, the predetermined target temperature and the target temperature expected when normal operation is assumed The arrival time is set and the heating unit temperature is made to reach the target temperature or is maintained at the target temperature by controlling the energization state to the heating unit by the driving means based on the heating unit temperature information. The temperature of the heat generating part is detected to have reached an abnormal temperature by the heat generating part temperature information, and the temperature of the heat generating part does not reach the target temperature within the reaching time. In the heat generation part temperature control device set to judge that an abnormality has occurred in the device when it is detected, it is arranged between the drive means and the heat generation part, and detects the energized state to the heat generation part. In addition to the above case, the temperature control means is also provided with an energization state detecting means, and an abnormality occurs in the device when the energization state detecting means detects that the electricity is not applied to the heat generating portion. It is achieved by setting so as to judge.

According to the second invention of the present application,
The above-mentioned object is achieved by setting the temperature control means so as to control the drive means so as to stop energization of at least the heat generating portion when it is determined that an abnormality has occurred in the device in the first invention. It

Further, according to the third invention of the present application, the above-mentioned object is the temperature control means in the above-mentioned first invention or the second invention, when it is judged that an abnormality has occurred in the device, This is achieved by setting to notify the control error information.

[0032]

According to the first invention of the present application, when the control is started, the temperature control means detects the temperature of the heat generating portion at that time based on the heat generating portion temperature information output from the temperature detecting means. Then, the target temperature of the heat generating part to be raised is set.
Further, based on the power supply voltage level information output from the power supply voltage level detection means, the time required to reach the target temperature that is expected when normal operation is assumed is set. Then, by starting the energization to the heat generating portion via the driving means, by controlling the energization state to the heat generating portion by the driving means, the temperature of the heat generating portion is made to reach the target temperature,
Alternatively, the target temperature is maintained. On the other hand, when it is detected that the temperature of the heat generating portion reaches an abnormal temperature by the heat generating portion temperature information, and when it is detected that the temperature of the heat generating portion does not reach the target temperature within the arrival time, Since it is determined that an abnormality has occurred and the prescribed processing is performed, the temperature of the heat generating part may rise to a dangerous temperature even if the heat generating part is energized when the driving unit or the temperature detecting unit fails. prevent. Further, an energization state detection unit for detecting an energization state to the heat generation unit is provided between the driving unit and the heat generation unit, and even when the energization state detection unit detects that the heat generation unit is not energized. Since it is determined that an abnormality has occurred in the device, disconnection of the heat generating portion is detected.

According to the second invention of the present application,
In the first aspect of the invention, when the temperature control means determines that an abnormality has occurred in the device, the temperature control means controls the drive means so as to stop the energization of at least the heat generating portion, so an accident such as ignition is prevented.

Further, according to the third invention of the present application, in the first invention or the second invention, when the temperature control means determines that an abnormality has occurred in the device,
Since the temperature control error information is notified, the user of the device can quickly be informed of the failure location, and appropriate processing is performed by the external device.

[0035]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a heat generating unit temperature control device according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a primary AC power supply, and an AC current is supplied from a primary AC power supply 1 to a heat generating portion 2 composed of an AC load via an AC applying drive portion 3 such as a triac as a drive means. To be done. In addition, the heating unit 2
Is input to the temperature control unit 5 as the heat generation unit temperature information 7 by the temperature detection unit 4 such as a thermistor installed adjacent to the heat generation unit 2 and further detected by the AC power supply voltage level as the power supply voltage level detection unit. Primary A output from section 9
The AC power supply voltage level information 10 of the C power supply 1 is the temperature control unit 5.
Is input to

The above-mentioned structure is the same as that of the conventional example described above, but in the apparatus of this embodiment, the AC applying drive section 3 and the heat generating section 2 are used.
An AC energization current presence / absence detection unit 11 as an energization state detection unit is connected between the temperature control unit 5 and the AC energization current presence / absence information 12 in the heating unit 2 which is an output of the AC energization current presence / absence detection unit 11. It is designed to be input to.

The AC energizing current presence / absence detecting section 11 is composed of, for example, a current transformer, a plurality of resistors, a comparator, an internal reference voltage generating section, and the like, and the AC energizing current presence / absence information 12 indicates that the current is flowing. , An “H” level signal, and an “L” level signal is output to the temperature control unit 5 when no current is flowing.

Therefore, the temperature control unit 5 judges the arrival time to the target temperature set by the AC power supply voltage level information 10 and the heat generation unit temperature information 7, and the heat generation unit temperature information 7 as in the conventional example described above. The abnormality determination of the device is performed based on the result of the comparison determination of the detected temperature obtained and the preset abnormal temperature, and further, by the AC energization current presence / absence information 12,
It is possible to detect a disconnection or the like of the heat generating portion 2.

Further, the temperature control means 5 sets the target temperature and the reaching time to the target temperature by the AC power supply voltage level information 10 and the heat generating part temperature information 7, as in the above-mentioned conventional example, and then sequentially generates the heat generating part temperature. The detected temperature obtained from the information 7 is compared with the target temperature, and the energization control signal 6 for controlling the energization amount to the heat generating part 2 is created so that the heat generating part temperature becomes the target temperature. Is output to the target temperature, or the target temperature is maintained.

The target temperature and the time required to reach the target temperature are
When the detected temperature obtained from the heat generation part temperature information 7 reaches the first target temperature, a plurality of them are prepared similarly to the above-described conventional example, and updated to the next target temperature and the arrival time to the next target temperature. To be done.

Furthermore, when an AC energizing current is being applied to the heat generating portion 2, by starting a timer,
It is the same as the above-mentioned conventional example in that it is determined whether or not the time to reach the set target temperature has been exceeded, and if it exceeds, the application of the AC energizing current is stopped as error processing.
The apparatus according to the present embodiment correctly determines whether or not the AC energizing current is flowing in the heat generating portion 2 based on the AC energizing current presence / absence information 12, and when it is determined that the AC energizing current is not flowing, the A
The application of the C energizing current is stopped.

Next, the temperature control of this embodiment will be described with reference to the flowchart of FIG. As shown in FIG. 2, in the temperature control unit 5 of this embodiment, first, the primary AC power source 1
AC power supply voltage level of the AC power supply voltage level detection unit 9
Of the AC power supply voltage level information 10 which is the output of the heat generation unit 2 is sensed (step S1-1), and the temperature of the heat generation unit 2 is output from the temperature detection unit 4.
After sensing by capturing (step S1-
2), set the first target temperature (step S1-3),
Also, the time required to reach the first target temperature, which is expected under the assumption that the normal operation is performed, is set as the reference time (step S1-4).

The time required to reach the target temperature is set by the AC as shown in FIG. 13 as in the conventional example described above.
The power supply voltage level is detected based on the AC power supply voltage level information 10 and is performed according to each AC power supply voltage level.

Next, the timer in the reset state is started (step S1-5), and the temperature of the heat generating portion 2 is fetched as the heat generating portion temperature information 7 output from the temperature detecting means 4 in the same manner as described above, and the temperature is measured. Sense is performed (step S1-6).

Then, the abnormal temperature set in advance and the detected temperature obtained from the heat generating part temperature information 7 are compared and determined (step S1-7). If the detected temperature is the abnormal temperature, error processing is performed. Implement (Step S1-
8). This error processing is similar to the conventional example shown in FIG.
This is a process of terminating the operation of controlling the temperature of the heat generating portion after stopping the application of the AC current.

On the other hand, when the temperature is not abnormal, the target temperature and the detected temperature are compared and determined (step S1-9),
When the detected temperature is lower than the target temperature, after the application of the AC current (step S1-10), the AC energization current presence / absence information 12 output from the AC energization current presence / absence detection unit 11 is output.
Based on the above, it is determined whether or not the AC energizing current is flowing through the heat generating portion 2 correctly (step S1-11). as a result,
If the AC current is flowing through the heat generating part 2 correctly,
It is determined whether or not a timeout has occurred (step S1-12),
If not, the error processing as described above is performed (steps S1-111 to S1-8).

Whether or not the time is out is determined by comparing and determining the time to reach the first target temperature set as the reference time and the value of the timer at that time (step S1-12). If the value is large, the above-mentioned error processing is performed because it is a time-out (steps S1-12 to S1-8), and if it is small, it is not a time-out and the operation from temperature sensing is repeated (step S1- 12-S1-6).

When the detected temperature is equal to or higher than the target temperature, it is determined whether or not the final target temperature has been reached (step S1-13). If not, the timer is reset (step S1). -14), and then a series of operations from the second and subsequent target temperature settings are repeated (step S1).
-14 to S1-3 or later). When the final target temperature is reached, the application of the AC current is stopped (step S1-15), and then the timer is reset (step S1).
-14), the series of operations described above is repeated so as to maintain the final target temperature (steps S1-14 to S1-3 and thereafter).

In addition, when the application of the AC current is stopped (step S1-15), the energization control signal 6 input to the AC application drive unit 3 is supplied so that the AC current is not energized to the heat generating unit 2.
Is set to the energization stop level, and when the timer is reset (step S1-14), the timer that was running is set to the reset state. Further, when the AC current is applied (step S1-10), the energization control signal 6 input to the AC application drive unit 3 is set to the energization permission level so that the heating unit 2 is energized with the AC current.

As described above, according to the present invention, while controlling the temperature so that the temperature of the heat generating portion becomes the target temperature, the heat generating portion 2 due to a failure of the AC application driving portion 3, the temperature detecting means 4, etc.
It is possible to detect an abnormal current flow due to a break in the heat generating portion 2 while preventing the abnormal temperature rise.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 3 is a block diagram showing a heating part temperature control device according to the second embodiment of the present invention. The present embodiment is different from the first embodiment in that the temperature control unit 5 creates the temperature control error information 8 and informs it to the outside. The temperature control error information 8 is output to a display unit (not shown) and a control unit (not shown) inside and outside the device.

That is, in this embodiment, similarly to the conventional example shown in FIG. 7, after the application of the AC current is stopped, the error notification is carried out, and then the error processing for ending the operation of the temperature control of the heating portion is performed. However, this error notification is output from the temperature control unit 5 as the temperature control error information 8 to the display unit (not shown) including the temperature control unit 5 in the heat generation unit temperature control operation, and the temperature control is performed. While displaying the error,
This is done by notifying an external device (not shown).

As described above, according to the present invention, the abnormality of the device is promptly notified to the user of the device or an external device,
A rapid and appropriate abnormal recovery process can be expected.

(Third Embodiment) Next, a third embodiment of the present invention will be described. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

A general-purpose device can be provided by using a halogen heater as the heat generating portion 2 of the first and second embodiments of the present invention. Further, the effect of the present invention becomes remarkable by changing the characteristics shown in FIG. 13 to the characteristics of the halogen heater.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the first and second embodiments, the timer that counts up after resetting is used.
The same effect can be obtained by using a timer that counts down and determining whether the timer value is greater than 0. Further, the plurality of target temperatures and the time required to reach the target temperature were N = 3 in the above-described embodiment, but are not limited to this value. Further, although the AC power supply voltage level of 1.2 Vtyp to 0.8 Vtyp is used in the above-mentioned embodiment, it is not limited to this value.

[0060]

As described above, according to the first invention of the present application, the heat generating portion temperature information output by the temperature detecting means and the power supply voltage level information output by the power supply voltage level detecting means are provided. Based on the predetermined target temperature and the time required to reach the target temperature when it is assumed that the normal operation is performed, the temperature is set to the heating unit by the driving unit based on the heating unit temperature information. Since the power supply state is controlled, it is possible to perform appropriate temperature control even for a heat generating portion whose heat generation efficiency largely changes depending on the power supply voltage level. Furthermore, when it is detected that the temperature of the heat generating portion reaches an abnormal temperature by the heat generating portion temperature information, and when it is detected that the temperature of the heat generating portion does not reach the target temperature within the reaching time, and the driving means. When it detects that the heat generating part is not energized by the energization state detecting means disposed between the heat generating part and the heat generating part, it is determined that an abnormality has occurred in the device. It is possible to determine not only the failure of the means etc., but also the presence or absence of a wire breakage of the heat generating portion, and it is possible to prevent smoking or ignition.

According to the second invention of the present application,
In addition to the effect of the first aspect of the invention, when it is determined that an abnormality has occurred in the device, at least the power supply to the heat generating portion is stopped, so that an accident such as ignition can be prevented.

Further, according to the third invention of the present application, in addition to the effect of the first invention, by passing the temperature control error information of the heat generating section inside and outside the apparatus, a temperature control error occurs and its error occurs. Since it is possible to provide a heat generation part temperature control device and method capable of reporting and displaying the contents inside and outside the device, it is possible to grasp a failure or the like of the device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a heat generating unit temperature control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing temperature control by the apparatus of FIG.

FIG. 3 is a block diagram showing a configuration of a heat generating unit temperature control device according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional heat generation unit temperature control device.

FIG. 5 is a flowchart showing temperature control by the apparatus of FIG.

FIG. 6 is a flowchart showing an example of error processing in the apparatus shown in FIG.

7 is a flowchart showing another example of error processing in the apparatus of FIG.

FIG. 8 is a flowchart showing temperature control according to another conventional example.

FIG. 9 is a flowchart showing temperature control according to another conventional example.

FIG. 10 is a flowchart showing temperature control according to another conventional example.

FIG. 11 is a block diagram showing the configuration of another conventional device.

12 is a flowchart showing temperature control by the apparatus in FIG.

13 is a diagram showing the relationship between the temperature of the heat generating part and the target temperature arrival allowable time depending on the AC power supply voltage level used in the apparatus of FIG.

[Explanation of symbols]

2 heat generating part 3 AC applying drive part (driving means) 4 temperature detecting means 5 temperature control part (temperature controlling means) 7 heat generating part temperature information 8 temperature control error information 9 AC power supply voltage level detecting part (power supply voltage level detecting means) 10 AC power supply voltage level information (power supply voltage level information) 11 AC energization current presence / absence detection unit (energization state detection means)

Claims (3)

[Claims] 1. A temperature detecting means installed adjacent to a heat generating portion that generates heat when energized, a driving means for applying a current to the heat generating portion, a power supply voltage level detecting means for detecting a power supply voltage level, and a temperature control. A heating unit temperature control device, wherein the temperature control unit outputs the heating unit temperature information output from the temperature detection unit and the power supply voltage level information output from the power supply voltage level detection unit. On the basis of the predetermined target temperature and the expected arrival time to the target temperature when it is assumed that the normal operation is performed, the driving means is used to set the temperature based on the heat generation part temperature information. By controlling the energization state to the heat generating part, it is set so that the heat generating part temperature reaches the target temperature or is maintained at the target temperature. Set to determine that an abnormality has occurred in the device when it detects that the temperature has reached an abnormal temperature and when it detects that the temperature of the heat generating part has not reached the target temperature within the arrival time. In the heat-generating-part temperature control device, the heat-generating part is provided between the driving means and the heat-generating part, and includes an energization state detecting means for detecting an energization state to the heat-generating part. In addition, the heating portion temperature control is characterized in that it is set so as to determine that an abnormality has occurred in the device even when the energization state detecting means detects that the heating portion is not energized. apparatus. 2. The temperature control means is set so as to control the drive means so as to stop energization of at least the heat generating means when it is determined that an abnormality has occurred in the device. Heater temperature control device. 3. The temperature control means is set to notify temperature control error information when it is determined that an abnormality has occurred in the device.
The temperature controller for the heat generating part described in.