JP7040348B2 - Heater device - Google Patents

Description

The present invention relates to a heater device that heats with the heat of a heat generating portion generated by energization.

Conventionally, there is a safety device described in Patent Document 1. This device has a heating wire connected by arranging a thermal fuse in series with an AC power supply, a short-circuit wire attached to this heating wire via a heat-sensitive layer, and heat generation connected in series with this short-circuit wire. With resistance. In this device, an AC voltage is induced in a short-circuit line via a heat-sensitive layer by an AC current flowing through a heating wire. When the heating wire is abnormally heated, the heat-sensitive layer covering the heating wire melts, a short-circuit current flows between the heating wire and the short-circuit wire, and the heat-generating resistance connected to the short-circuit wire generates heat. Then, the thermal fuse arranged at a position close to the heat generation resistance is blown to cut off the power supply to the heat generation line.
(See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 5-152055

In the apparatus described in Patent Document 1, for example, when the heating wire is abnormally heated, the thermal fuse is blown and the current flowing through the heating wire is cut off. However, the device described in Patent Document 1 is provided with a thermal fuse, a heat sensitive layer, a short-circuit wire, and a heat generating resistance in order to cut off the current flowing through the heating wire, the configuration is complicated, the number of parts is large, and the cost is high. There is a problem that it becomes expensive.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to cut off the current flowing through the heating wire when the heating portion is damaged with a simpler configuration.

In order to achieve the above object, the invention according to claim 1 comprises a heat generating unit (22) that generates heat by energization and a current control unit (30) that controls a current supplied from a power source (15) to the heat generating unit. It is a heater device that heats and heats the heat generating part by supplying a predetermined current from the power supply to the heat generating part. The damaged part of the body heats up locally and melts.

According to such a configuration, when the heat generating part is damaged, when a predetermined current is supplied from the power supply to the heat generating part, the damaged part of the heat generating part locally generates heat and melts. Can cut off the current flowing through the heat generating part when it is damaged.

In order to achieve the above object, the invention according to claim 4 comprises a heat generating unit (22) that generates heat by energization and a current control unit (30) that controls a current supplied from a power source (15) to the heat generating unit. It is a heater device that heats and heats the heat generating part by supplying a normal current from the power supply to the heat generating part. The current flowing through the heat generating portion is controlled so as to switch the second state in which the fusing current in which the damaged portion of the heat generating portion is blown is supplied from the power source to the heat generating portion without fusing the undamaged heat generating portion.

According to such a configuration, in the current control unit, the first state in which the normal current is supplied from the power supply to the heat generating portion and the damaged portion of the heat generating portion without melting the undamaged heat generating portion are formed. Since the current flowing through the heating unit is controlled so that the fusing current is supplied from the power supply to the heating unit to switch the second state, the current flowing through the heat generating unit is cut off with a simpler configuration. can do.

The reference numerals in parentheses of each means described in this column and the scope of claims indicate the correspondence with the specific means described in the embodiments described later.

It is a figure which showed the mounting position of the heater device which concerns on 1st Embodiment. It is a figure which saw the heater device through the insulating layer 232 from the direction of arrow II in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. It is a figure for demonstrating the length of the heating wire, and is the schematic diagram which showed the heating wire in a straight line. It is a figure for demonstrating the width and thickness of a heating wire. It is a figure explaining the damage rate of a heating wire. It is a figure which showed the relationship between the damage rate of a heating wire and a momentary current. It is a figure which showed the relationship between the damage rate and the temperature of a local heating part. It is a figure which showed the relationship between the damage rate and the time until a disconnection. It is a block diagram of the heater device which concerns on 1st Embodiment. It is a figure which showed the current waveform of the heater current flowing through the heating wire of the heater apparatus which concerns on 1st Embodiment. It is a figure which showed the current waveform of the heater current flowing through the heating wire of the heater apparatus which concerns on 1st Embodiment. It is a block diagram of the heater device which concerns on 2nd Embodiment. It is a figure which showed the current waveform of the heater current flowing through the heating wire of the heater apparatus which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the following embodiments, the parts that are the same or equal to each other are designated by the same reference numerals in the drawings.

(First Embodiment)
The heater device of the first embodiment will be described with reference to FIGS. 1 to 12. In FIG. 1, the heater device 2 according to the first embodiment is installed in the room of a moving body such as a road traveling vehicle. The heater device 2 constitutes a part of the heating device for the room. The heater device 2 is an electric heater that generates heat by being supplied with power from a power source such as a battery or a generator mounted on a moving body. The heater device 2 is formed in the shape of a thin plate. The heater device 2 generates heat when electric power is supplied. The heater device 2 radiates radiant heat H mainly in the direction perpendicular to the surface in order to heat the object positioned in the direction perpendicular to the surface thereof.

A seat 11 for the occupant 12 to sit in is installed in the room. The heater device 2 is installed indoors so as to radiate radiant heat H to the feet of the occupant 12. The heater device 2 can be used, for example, as a device for immediately providing warmth to the occupant 12 immediately after the start of another heating device. The heater device 2 is installed on the wall surface of the room. The heater device 2 is installed so as to face the occupant 12 in the assumed normal posture. For example, a road vehicle has a steering column 14 for supporting the steering wheel 13. The heater device 2 can be installed on the lower surface of the steering column 14 so as to face the occupant 12.

Next, the configuration of the heater device 2 will be described with reference to FIGS. 2 to 5. As shown in FIGS. 2 to 3, the heater device 2 has a heater portion 20 extending along an XY plane defined by an axis X and an axis Y. The heater portion 20 has a thickness in the direction of the axis Z. The heater portion 20 is formed in a substantially quadrangular thin plate shape.

The heater unit 20 has an insulating layer 23, an electrode 21, and a heat generating unit 22. The heater unit 20 can also be referred to as a planar heater that radiates radiant heat H mainly in a direction perpendicular to the surface.

The insulating layer 23 has an insulating layer 231 and an insulating layer 232. The insulating layer 231 and the insulating layer 232 each have a plate shape, and are arranged in parallel in the Z-axis direction of the heater device 2. The insulating layer 232 is arranged on the occupant 12 side of the insulating layer 231.

As shown in FIG. 3, the electrode 21 and the heat generating portion 22 are arranged on the surface of the insulating layer 231 on the insulating layer 232 side. The electrode 21 and the heat generating portion 22 are formed on the insulating layer 231 by pattern printing or the like.

As shown in FIG. 2, the electrode 21 has an electrode 211 and an electrode 212. Each of the electrodes 211 and 212 is connected to a vehicle battery 15 described later via a wire harness (not shown).

Each of the electrodes 211 and 212 has a rectangular shape. Each of the electrodes 211 and 212 is made of a material having a low electric resistance. The electrodes 211 and 212 can be made of a metal material.

The heating unit 22 has a heating wire 221 and a heating wire 222. The heating wires 221 and 222 are connected between the electrode 211 and the electrode 212. Each heating wire 221 and 222 generates heat when energized. Each heating wire 221 and 222 is configured as a heating wire forming a linear shape. The heating wires 221 and 222 are arranged side by side in a meandering manner.

The width and thickness of each heating wire 221 and 222 with respect to the length direction of each heating wire 221 and 222 are the same. However, the width and thickness of the curved portion of each heating wire 221 and 222 are longer than the width and thickness of the straight portion. That is, the width and thickness of the cross section orthogonal to the length direction of each heating wire 221 and 222 in the straight portion of each heating wire 221 and 222 are the same at any position.

When the cross-sectional area of the cross section orthogonal to the length direction of the heat-generating portion 22 becomes smaller than the cross-sectional area before the damage due to the damage of each heating wire 221 and 222, the damaged part of the heat-generating portion locally generates heat and melts. There is.

Each heating wire 221 and 222 is made of a material having a low electrical resistance. Each heating wire 221 and 222 can be made of a metallic material. For example, each heating wire 221 and 222 can be configured by using a metal such as copper, SUS, silver, or gold and an alloy containing these.

The heater device 2 heats with the heat generated by the heating wires 221 and 222 when a predetermined current is supplied to the heating wires 221 and 222.

As shown in FIG. 4, the length of the heating wires 221 and 222 is L. Further, as shown in FIG. 5, when the width of the heating wires 221 and 222 is W and the thickness of the heating wires 221 and 222 is t, the cross-sectional area of the heating wires 221, 222 is expressed as W × t. Can be done.

As shown in FIG. 6, when each heating wire 221, 222 is damaged and the remaining width of the damaged portion is x, the damage rate of the damaged portion of each heating wire 221, 222 is the damage rate = (W × t). It can be expressed as −x × t) / (W × t). That is, the damage rate can be expressed as the ratio of the cross-sectional area of the remaining portion of the heating wire 221 and 222 after the damage to the cross-sectional area of the damaged portion of the heating wire 221 and 222 before the damage.

The current flowing through each heating wire 221 and 222 is the voltage of the vehicle battery 15, the electric resistance characteristics of each heating wire 221 and 222, the cross-sectional area of each heating wire 221 and 222, and the length of each heating wire 221 and 222. Determined by L. Further, the greater the degree of damage to each heating wire 221 and 222, the greater the damage rate.

In the heater unit 20 of the present embodiment, when the heating wires 221 and 222 are damaged, when a predetermined current is supplied to the heating wires 221 and 222, the damaged portions of the heating wires 221, 222 locally generate heat and melt. do.

Here, the fact that the damaged parts of the heating wires 221 and 222 generate heat locally and melt is called instantaneous interruption, and the current required to melt the damaged parts of the heating wires 221, 222 is the instantaneous interruption current. Called. The momentary interruption current is the minimum current that is continuously passed to blow the damaged portion of the heating wires 221 and 222. The momentary interruption current can be about 1 ampere.

As shown in FIG. 7, the degree of damage to the heating wires 221 and 222 is large, and the damage rate of the heating wires 221 and 222 is increased, so that the instantaneous interruption current becomes smaller. That is, the larger the degree of damage, the smaller the current can be used to momentarily interrupt the damaged portion.

Further, when the heat generating lines 221 and 222 are damaged, local heat generation is generated in the damaged portion of the heat generating unit 22 when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22. Then, as shown in FIG. 8, as the damage rate of each heating wire 221 and 222 increases, the temperature of the local heating portion also rises.

Further, as shown in FIG. 9, the larger the damage rate of the damaged portion of each heating wire 221 and 222, the shorter the time until the damaged portion of each heating wire 221 and 222 is disconnected.

When the heating wires 221 and 222 are damaged, the heater portion 20 has a heating wire 221 before the surface temperature of the insulating layer 23 covering the damaged portion becomes equal to or higher than a predetermined temperature that causes thermal discomfort to the human body. The length, cross-sectional area, etc. of each heating wire 221 and 222 are determined so that the damaged portion of 222 generates heat locally and melts.

When the heating wires 221 and 222 are not damaged, the occupant does not feel thermal discomfort even if he / she touches the area around the damaged part.

Further, when each heating wire 221 and 222 is damaged while a predetermined current is supplied to each heating wire 221 and 222, the damaged portion of each heating wire 221 and 222 locally generates heat, but each heating wire 221 and The damaged part of 222 is rapidly melted, and no current flows through each heating wire 221 and 222. Therefore, even if the occupant touches the area around the damaged part, he / she does not feel thermal discomfort.

Next, the block configuration of the heater device 2 of the present embodiment will be described with reference to FIG. The heater device 2 includes a heater unit 20, a temperature detection unit 33, and a current control unit 30. Further, the current control unit 30 includes a drive device 31 and an ECU 32. The ECU 32 corresponds to a control unit.

The temperature detection unit 33 detects a temperature that changes due to heat generation of the heater unit 20, such as the surface temperature of the insulating layer 232, and outputs a signal indicating the detected temperature to the ECU 32.

The ECU 32 is configured as a computer having a CPU, a memory, an I / O, and the like. The ECU 32 performs various processes according to the program stored in the memory. The ECU 32 controls the drive device 31 so that a predetermined current flows through the heat generating unit 22 of the heater unit 20 based on the signal output from the temperature detecting unit 33.

The drive device 31 operates on the electric power supplied from the vehicle battery 15. The vehicle battery 15 corresponds to a power source. The drive device 31 has circuit elements such as a MOS transistor, a relay, and an IPD (Intelligent Power Module). The drive device 31 drives the current flowing through the heat generating unit 22 of the heater unit 20 according to the signal input from the ECU 32.

The current control unit 30 of the present embodiment PWM (Pulse Width Modulation) control of the heat generation unit 22 of the heater unit 20. Specifically, the ECU 32 generates a PWM signal, and a current corresponding to the PWM signal flows to the heat generating unit 22. The duty ratio D of the PWM signal is expressed as the ratio of the pulse width H to the control cycle cycle T of the PWM signal. That is, it is expressed as D = (H / T) × 100 [%]. The larger the duty ratio D of the PWM signal, the larger the amount of heat generated by the heat generating unit 22.

The ECU 32 specifies the duty ratio D of the PWM signal so that the temperature detected by the temperature detection unit 33 approaches a predetermined set temperature, and outputs the PWM signal of the specified duty ratio D to the drive device 31.

Specifically, when the temperature detected by the temperature detection unit 33 is lower than the set temperature, the ECU 32 outputs a PWM signal having a larger duty ratio D, and the temperature detected by the temperature detection unit 33 is the same. If the temperature is higher than the set temperature, a PWM signal with a smaller duty ratio D is output.

Here, if the duty ratio D of the PWM signal is made too small when the temperature detected by the temperature detection unit 33 is higher than the set temperature, a predetermined current is supplied from the vehicle battery 15 to the heat generation unit 22 as shown in FIG. The average current per unit time flowing through the heat generating unit 22 when the heat is supplied becomes less than the instantaneous interruption current, and the damaged portion of the heat generating unit 22 cannot be blown.

Therefore, as shown in FIG. 12, in the ECU 32, when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22, the average current per unit time flowing through the heat generating unit 22 is larger than the instantaneous interruption current, and the ECU 32 has a larger current than the instantaneous interruption current. , A PWM signal is generated so that the duty ratio is such that the undamaged heat generating portion is not blown.

That is, in the ECU 32, when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22, the average current per unit time flowing through the heat generating unit 22 is larger than the instantaneous interruption current, and the heat generating unit 22 is not damaged. A PWM signal is generated with the duty ratio that does not blow the current as the lower limit.

This makes it possible to prevent the current flowing through the heat generating unit 22 from being too low when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22 so that the damaged portion of the heat generating unit 22 cannot be blown. Become.

As described above, the heater device includes a heat generating unit 22 that generates heat by energization, and a current control unit 30 that controls the current supplied from the vehicle battery 15 to the heat generating unit 22. Then, by supplying a predetermined current from the vehicle battery 15 to the heat generating unit 22, the heat generating unit 22 generates heat and heats the unit. Further, when the heat generating portion 22 is damaged, when a predetermined current is supplied from the vehicle battery 15 to the heat generating portion 22, the damaged portion of the heat generating portion 22 locally generates heat and melts.

According to such a configuration, when the heat generating portion 22 is damaged, when a predetermined current is supplied from the vehicle battery 15 to the heat generating portion 22, the damaged portion of the heat generating portion 22 locally generates heat and melts, which is simpler. With the configuration, it is possible to cut off the current flowing through the heat generating portion when the heat generating portion is damaged.

Further, the current control unit includes an ECU 32 that generates a PWM signal capable of changing the duty ratio, which is the ratio of the pulse width to the control cycle cycle. Further, the drive device 31 is provided to control the current supplied to the heat generating unit 22 so that the current corresponding to the duty ratio of the PWM signal generated by the ECU 32 flows to the heat generating unit 22.

Further, in the ECU 32, when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22, the average current per unit time flowing through the heat generating unit 22 is required to melt the damaged portion of the heat generating unit 22. A PWM signal having a duty ratio that is larger than the current and has a duty ratio that does not cause the undamaged heat generating portion 22 to be blown is generated.

Therefore, when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22, the current flowing through the heat generating unit 22 does not drop too much and the damaged portion of the heat generating unit 22 cannot be blown.

Further, in the control unit, when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22, the average current per unit time flowing through the heat generating unit 22 is the moment required to melt the damaged portion of the heat generating unit 22. A PWM signal is generated with a duty ratio as a lower limit value, which is larger than the disconnection current and does not cause the undamaged heat generating portion 22 to be fused.

As described above, when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22, the average current per unit time flowing through the heat generating unit 22 is the instantaneous interruption current required to melt the damaged portion of the heat generating unit 22. By generating a PWM signal with a duty ratio that is larger than that and does not blow the undamaged heat generating unit 22 as the lower limit value, the heat generating unit 22 receives a predetermined current when a predetermined current is supplied from the vehicle battery 15 to the heat generating unit 22. It is possible to prevent the current flowing from being too low from causing the damaged portion of the heat generating portion 22 to be blown.

Further, the heat generating portion 22 has a linear shape, and when the cross-sectional area of the cross section orthogonal to the length direction of the heat generating portion 22 becomes smaller than the cross-sectional area before the damage due to the damage of the heat generating portion 22, the heat generating portion 22 is damaged. The affected area generates heat locally and melts.

As described above, the heat generating portion 22 has a linear shape, and when the cross-sectional area of the cross section orthogonal to the length direction of the heat generating portion 22 becomes smaller than the cross-sectional area before the damage due to the damage of the heat generating portion 22, the heat generating portion 22 is formed. It can be configured so that the damaged part of the body heats up locally and melts.

Further, the width and thickness of the heat generating portion 22 with respect to the length direction of the heat generating portion 22 are the same. In this way, the width and thickness of the heat generating portion 22 with respect to the length direction of the heat generating portion 22 can be configured to be the same.

(Second Embodiment)
The heater device according to the second embodiment will be described with reference to FIGS. 13 to 14. The heater device 2 of the present embodiment is different from the heater device of the first embodiment in that it further includes a capacitor 34 and a trigger circuit 35.

The capacitor 34 is arranged between the vehicle battery 15 and the trigger circuit 35. The electric charge from the vehicle battery 15 is accumulated or the accumulated electric charge is discharged according to the state of the trigger circuit 35.

The trigger circuit 35 has a switching element that turns on or off. When the switching element of the trigger circuit 35 is turned on in response to the control signal from the ECU 32, the electric charge accumulated in the capacitor 34 is discharged and added to the PWM signal output from the drive device 31.

The ECU 32 sets a trigger circuit 35 so that the electric charge accumulated in the capacitor 34 among the PWM signals output from the drive device 31 is discharged and added to the PWM signal output from the drive device 31 within the period of the pulse width H. Control.

As shown in FIG. 14, the trigger circuit 35 supplies a fusing current of the PWM signal, which is larger than the normal operating current during the period of the pulse width H, to the heater unit 20. Here, the fusing current refers to a current that does not flute the undamaged heat generating portion 22 and that the damaged portion of the fusing portion 22 flies. The normal operating current is a normal current.

The heater device 2 of the present embodiment includes a heat generating unit 22 that generates heat by energization and a current control unit 30 that controls a current supplied from the vehicle battery 15 to the heat generating unit 22. By supplying an electric current, the heat generating part generates heat and heats it.

As shown in FIG. 14, the current control unit 30 does not melt the undamaged heat generating unit 22 in the first state in which the normal operating current, which is a normal current, is supplied from the vehicle battery 15 to the heat generating unit 22. In addition, the current flowing through the heat generating portion 22 is controlled so that the fusing current at which the damaged portion of the heat generating portion 22 is blown switches the second state in which the fusing current is supplied from the vehicle battery 15 to the heat generating portion 22.

Specifically, the current control unit 30 causes the normally used current to flow through the heat generating unit 22, and then causes a fusing current larger than the normally used current to flow through the heat generating unit 22. After that, the current control unit 30 again causes the normally used current to flow to the heat generating unit 22, and then prevents the current from flowing to the heat generating unit 22. Such control is periodically and repeatedly performed.

As described above, the heater device includes a heat generating unit 22 that generates heat by energization, and a current control unit 30 that controls the current supplied from the vehicle battery 15 to the heat generating unit 22. Then, by supplying a normal current from the vehicle battery 15 to the heat generating unit 22, the heat generating unit 22 generates heat and heats the unit.

In the current control unit 30, the first state in which the normal operating current is supplied from the vehicle battery 15 to the heat generating unit 22 and the damaged portion of the heat generating unit 22 are not fused without causing the undamaged heating unit 22 to be fused. The current flowing through the heat generating unit 22 is controlled so that the fusing current is switched from the vehicle battery 15 to the second state of being supplied to the heat generating unit 22.

According to such a configuration, the current control unit 30 does not cause the first state in which the normal current is supplied from the vehicle battery 15 to the heat generation unit 22 and the undamaged heat generation unit 22 to be blown, and the heat generation unit 30. The damaged part of 22 is blown. The current flowing through the heat generating part 22 is controlled so that the fusing current is supplied from the power source to the heat generating part to switch the second state. Therefore, in a simpler configuration, when the heat generating part 22 is damaged. The current flowing through the heat generating portion 22 can be cut off.

In the present embodiment, the same effect obtained from the configuration common to the first embodiment can be obtained in the same manner as in the first embodiment.

(Other embodiments)
(1) In each of the above embodiments, the heater device is installed in the interior of the vehicle, but the heater device is not limited to the interior of the vehicle, and is installed, for example, in the interior of a moving body such as a ship or an aircraft. You can also do it.

(2) In each of the above embodiments, an example in which the current flowing through the heat generating unit 22 is PWM controlled by a PWM signal is shown. It is also possible to control the current flowing through 22.

The present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope of the claims. Further, the above embodiments are not unrelated to each other, and can be appropriately combined unless the combination is clearly impossible. Further, in each of the above embodiments, it goes without saying that the elements constituting the embodiment are not necessarily essential except when it is clearly stated that they are essential or when they are clearly considered to be essential in principle. stomach. Further, in each of the above embodiments, when numerical values such as the number, numerical values, quantities, and ranges of the constituent elements of the embodiment are mentioned, when it is clearly stated that they are particularly essential, and when it is clearly limited to a specific number in principle. It is not limited to the specific number except when it is done. In addition, in each of the above embodiments, when the material, shape, positional relationship, etc. of the constituent elements, etc. are referred to, except when specifically specified or when the material, shape, positional relationship, etc. are limited to a specific material, shape, positional relationship, etc. in principle. , The material, shape, positional relationship, etc. are not limited.

(summary)
According to the first aspect shown in a part or all of the above embodiments, the heater device includes a heat generating unit that generates heat by energization and a current control unit that controls the current supplied from the power source to the heat generating unit. I have. Then, by supplying a predetermined current from the power source to the heat generating portion, the heat generating portion generates heat to perform heating. Then, when the heat-generating portion is damaged, when a predetermined current is supplied from the power source to the heat-generating portion, the damaged portion of the heat-generating portion locally generates heat and melts.

Further, according to the second aspect, the current control unit includes a control unit that generates a PWM signal capable of changing the duty ratio, which is the ratio of the pulse width to the control cycle cycle, and the PWM generated by the control unit. It is provided with a drive device that controls the current supplied to the heat generating portion so that the current corresponding to the duty ratio of the signal flows to the heat generating portion. Then, in the control unit, the average current per unit time that flows to the heat generating unit when a predetermined current is supplied from the power supply to the heat generating unit is larger than the instantaneous interruption current required to blow the damaged portion of the heat generating unit. In addition, a PWM signal having a duty ratio that does not melt the undamaged heat generating portion is generated.

Therefore, it is possible to prevent the current flowing through the heat generating portion from being too low when a predetermined current is supplied from the power source to the heat generating portion so that the damaged portion of the heat generating portion cannot be blown.

Further, according to the third viewpoint, in the control unit, when a predetermined current is supplied from the power supply to the heat generating portion, the average current per unit time flowing through the heat generating portion causes the damaged portion of the heat generating portion to be blown. A PWM signal is generated with a duty ratio as the lower limit value, which is larger than the required instantaneous interruption current and does not melt the undamaged heat generating portion.

In this way, the average current per unit time that flows to the heat generating part when a predetermined current is supplied from the power supply to the heat generating part is larger than the instantaneous interruption current required to blow the damaged part of the heat generating part, and By generating a PWM signal with the duty ratio that does not melt the undamaged heat-generating part as the lower limit, the current flowing through the heat-generating part drops too much when a predetermined current is supplied from the power supply to the heat-generating part. It is possible to eliminate the fact that the damaged part cannot be blown.

Further, according to the fourth aspect, the heater device includes a heat generating unit that generates heat by energization and a current control unit that controls the current supplied from the power source to the heat generating unit. Then, by supplying a normal current from the power source to the heat generating portion, the heat generating portion generates heat to perform heating. Then, in the current control unit, the power source is the first state in which the normal current is supplied from the power supply to the heat generating portion, and the fusing current in which the damaged portion of the heat generating portion is fused without fusing the undamaged heat generating portion. The current flowing through the heat generating unit is controlled so as to switch the second state supplied from the heat generating unit.

Further, according to the fifth aspect, the heat generating portion has a linear shape, and when the cross-sectional area of the cross section orthogonal to the length direction of the heat generating portion becomes smaller than the cross-sectional area before the damage due to the damage of the heat generating portion, The damaged portion of the heat generating portion 22 generates local heat and melts.

As described above, the heat generating portion has a linear shape, and when the cross-sectional area of the cross section orthogonal to the length direction of the heat generating portion becomes smaller than the cross-sectional area before the damage due to the damage of the heat generating portion, the damaged portion of the heat generating portion is formed. Can be configured to generate heat locally and melt.

Further, according to the sixth viewpoint, the width and the thickness of the heat generating portion with respect to the length direction of the heat generating portion are the same. In this way, the width and thickness of the heat generating portion with respect to the length direction of the heat generating portion can be configured to be the same.

2 Heater device 15 Vehicle battery 20 Heater unit 21 Electrode 22 Heat generation unit 23 Insulation layer 30 Current control unit 31 Drive unit 32 ECU
33 Temperature detector

Claims (6)

A heat generating unit (22) that generates heat by energization and a current control unit (30) that controls a current supplied from the power source (15) to the heat generating unit are provided, and a predetermined current is supplied from the power source to the heat generating unit. This is a heater device in which the heat generating portion generates heat and heats the heat.
A heater device in which when the heat-generating portion is damaged, the damaged portion of the heat-generating portion locally generates heat and melts when the predetermined current is supplied from the power source to the heat-generating portion. The current control unit includes a control unit (32) that generates a PWM signal capable of changing the duty ratio, which is the ratio of the pulse width to the control cycle cycle, and the duty of the PWM signal generated by the control unit. A drive device (31) for controlling the current supplied to the heat generating portion so that the current corresponding to the ratio flows to the heat generating portion is provided.
In the control unit, when the predetermined current is supplied from the power source to the heat generation unit, the average current per unit time flowing through the heat generation unit is required to melt the damaged portion of the heat generation unit. The heater device according to claim 1, wherein the PWM signal having a duty ratio that is larger than the current and does not melt the undamaged heat generating portion is generated. In the control unit, when the predetermined current is supplied from the power source to the heat generation unit, the average current per unit time flowing through the heat generation unit is required to melt the damaged portion of the heat generation unit. The heater device according to claim 2, wherein the PWM signal is generated with the duty ratio as the lower limit value, which is larger than the current and does not melt the undamaged heat generating portion. A heat generating unit (22) that generates heat by energization and a current control unit (30) that controls a current supplied from the power source (15) to the heat generating unit are provided, and a normal current is supplied from the power source to the heat generating unit. This is a heater device in which the heat generating portion generates heat and heats the heat.
In the current control unit, the first state in which the normal current is supplied from the power source to the heat generating portion and the damaged portion of the heat generating portion are fused without fusing the undamaged heat generating portion. A heater device that controls the current flowing through the heat generating portion so as to switch the second state in which the fusing current is supplied from the power source to the heat generating portion. The heat generating portion is linear and has a linear shape.
According to claims 1 to 4, when the cross-sectional area of the cross section orthogonal to the length direction of the heat-generating portion becomes smaller than the cross-sectional area before the damage due to the damage of the heat-generating portion, the damaged portion of the heat-generating portion locally generates heat and melts. The heater device according to any one. The heater device according to claim 5, wherein the width and thickness of the heat generating portion are the same with respect to the length direction of the heat generating portion.

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