JPH04281506A - Current controller - Google Patents

Abstract

PURPOSE:To obtain a current controller which can control the starting time, and stopping time of an object whose currents are controlled. CONSTITUTION:A current controller 1 which is connected with an elelctric current applying circuit from a power source 4 to the object whose currents are controlled, and controls the applied currents to the above mentioned object whose currents are controlled, is equipped with a control element 2 constituted of an NTC element 7 indicating a negative resistance in a room temperature and a PTC element 6 of an organic system or an inorganic system member, and a switching means which selectively connects the NTC element 7 or the PTC element 6 of this control element 2 with the electric current applying circuit. The control of the starting time and the stopping time of the object whose currents are controlled can be executed by this constitution.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

[Industrial Application Field] The present invention relates to a current control device.
More specifically, the present invention relates to a current control device suitable for controlling the starting time and stopping time of a motor or the like.

0002

2. Description of the Related Art As a current control device 20 used for on/off control of a motor or the like, a device using a bimetal 23 as shown in FIG. 5 is conventionally known.

That is, this current control device 20 has a power supply 21
The bimetal 23 is inserted and connected to the energizing circuit from the motor 22 to the motor 22, and the bimetal 23 is displaced by the heater 24 heated by the heat generated by the motor 22 to cut off or close the energizing circuit, thereby controlling the energization to the motor 22. This is what I decided to do.

0004

However, in the case of the current control device 20 described above, the supply of current to the motor 21 is controlled by opening and closing the contacts of the bimetal 23. As shown in FIG. 6, there is a problem in that the motor 21 starts up and stops intermittently, and the start time and stop time of the motor 21 cannot be controlled.

In addition to the conventional device 20 described above, a current control device using a thermal relay is also known, but in this case as well, the control of the current flowing to the motor 21 is intermittent and the start time and stop time are controlled. is not possible.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a current control device that can continuously perform current control on a current-controlled object and can control the startup time and stop time of the current-controlled object. That is. A further object of the present invention is to provide a current control device in which the start time and stop time can be adjusted by changing the characteristics of the control element.

[Configuration of the invention]

[0008]

[Means for solving the problem] The invention according to claim 1 includes:
In a current control device that is connected to a current-carrying circuit from a power source to a current-controlled object and controls the current flowing to the current-controlled object, an NTC element exhibiting negative resistance near room temperature and a PTC element made of an organic or inorganic material The control element includes a control element consisting of a control element, and a switching means for selectively connecting an NTC element or a PTC element of the control element to an energizing circuit.

[0009] According to a second aspect of the present invention, there is provided a current control device in which the NTC element is formed of an oxide whose main component is V2O3.

0010

[Operation] The operation of the above-mentioned current control device will be explained below.

[0011] When starting up the current controlled object, the switching means connects the NTC element in the control element to the energizing circuit from the power source to the current controlled object. Then, the resistance value of the NTC element gradually decreases as the NTC element heats up, so the current flowing to the current-controlled object gradually increases, and the activation time of the current-controlled object can be controlled. . On the other hand, when the current-controlled object is stopped, the switching means connects the PTC element in the control element to the energizing circuit. Then, the resistance value of the PTC element gradually increases as the PTC element generates heat, so that the supplied current gradually decreases, making it possible to control the stop time of the current-controlled object.

[0012] Furthermore, by forming the NTC element with an oxide whose main component is V2 O3 and appropriately selecting the content ratio of V2 O3, it is possible to adjust the start time and stop time of the current-controlled object. becomes.

[0013]

EXAMPLES Examples of the present invention will be described in detail below.

The current control device 1 shown in FIG.
The control element 2 is connected to an energizing circuit that connects a power source) 4 and a motor 5 as a current-controlled object, and a switch 3 as a switching means.

The control element 2 includes a first electrode made of tungsten or molybdenum and formed into a plate shape, between a PTC element 6 and an NTC element 7, which are formed into a rectangular parallelepiped shape with the same dimensions and whose main component is V2O3. 8 and place P
The end surface (upper surface) side of the TC element 6 and the end surface (upper surface) of the NTC element 7
Second and third plate-shaped electrodes 9 and 10 made of tungsten or molybdenum are disposed on the lower surface side, respectively, so that the overall structure is integrated in a laminated state.

The PTC element 6 is made of, for example, an organic material such as a crystalline crosslinked polymer mixed with a conductive filler, or an inorganic material such as ceramics.

[0017] The NTC element 7 is, for example, a V2 O3
The main component is That is, first,
V2 O3 and Cr2 O3 are mixed in a predetermined ratio as raw materials, and rare earth oxides or Fe, Sn are used as firing aids.
Add transition metal elements such as In this case, V and Cr
In order to obtain a compositionally uniform raw material, it is important to hydrolyze vanadium oxide using an alkoxide to obtain a vanadium oxide having a predetermined ratio.

[0018] The oxide material is synthesized in this manner and fired in a normal hydrogen atmosphere at a temperature of 1300°C to 1500°C to form the NTC element 7.

The first electrode 8 is connected to the power source 4. The switch 3 includes a switch piece 11 connected to one terminal of the motor 5, and contacts 12a and 12b provided oppositely on the protruding end sides of the second and third electrodes 9 and 10. By inserting the switch piece 11 into the contact 12a side, the PTC element 6 is connected to the energizing circuit, and by inserting the switch piece 11 into the contact 12b side, the NTC element 7 is connected to the energizing circuit. .

Next, the operation of the current control device 1 having the above-described structure will be explained with reference to FIGS. 2 and 3.

When starting the motor 5, the switch piece 11 of the switch 3 is turned on to the contact 12b side, and the NTC element 7 in the control element 2 is connected to the energizing circuit from the power source 4 to the motor 5. Then, the resistance value of the NTC element 7 gradually decreases as the NTC element 7 generates heat, so the current flowing to the motor 5 gradually increases as shown in FIGS. 2 and 3, and the starting time of the motor 5 increases. can be controlled.

On the other hand, when the motor 5 is stopped, the switch 3
The switch piece 11 is inserted into the contact 12a side, and the control element 2
The PTC element 6 is connected to the energizing circuit. Then, the resistance value of the PTC element 6 gradually increases as the PTC element 6 generates heat, so the current flowing through it gradually decreases as shown in FIGS. 2 and 3, and the stop time of the motor 5 can be controlled. .

In this way, the control element 2 and the switch 3 can gradually increase or decrease the current supplied to the motor 5, thereby reducing the intermittent and large-loss current supplied to the motor 5, unlike the conventional example. Instead of energization control, continuous energization control with less loss can be realized.

FIG. 4 shows another embodiment of the present invention, and the current control device 1A shown in the figure is a control device in which a PTC element 6 and an NTC element 7 are separately constructed instead of the control element 2. The feature is that element 2A is used.

That is, the control element 2A is composed of individually formed P
In addition to the second and third electrodes 9 and 10, individual electrodes 8a and 8b are attached to the TC element 6 and NTC element 7, respectively, and both the individual electrodes 8a and 8b are commonly connected to the power source 4.

This current control device 1A can also exhibit the same effect as the current control device 1 described above.

Since the PTC element 6 and NTC element 7 in this embodiment described above are connected in series to the load, which is the object of current control, they must have a resistance value that does not cause any trouble to the load. is desirable. therefore,
In this example, an element whose main component is V2O3 (resistance value about 0.1 ohm) was used as the NTC element 7.
In addition, MnNiCo-based oxides, Fe2O3-based oxides, and LaCoO3-based oxides may be used to approximate the resistance value of each of these oxides to the resistance value of the NTC element 7. It becomes possible to configure 1A. Note that the NTC element 7 made of a material other than V2 O3 type has a resistance value at room temperature equal to that of V2 O3 type N.
It is important to note that since it is generally taller than the TC element 7, its element dimensions are somewhat constrained. In addition to the embodiments described above, the present invention can be modified in various ways within the scope of its gist.

For example, by varying the resistance temperature characteristics of the PTC element 6 and the NTC element 7, it is possible to arbitrarily adjust the starting time and stopping time of the current controlled object.

Furthermore, the power source 4 may be a DC power source.

[0030]

[Effects of the Invention] According to the present invention described in detail above, PTC elements and NTC elements having different resistance-temperature characteristics are selectively connected to a current-carrying circuit by means of a switching means. A current control device capable of controlling start time and stop time can be provided.

Furthermore, by using an NTC element made of an oxide containing V2O3 as a main component, it is possible to provide a current control device in which the start time and stop time can be adjusted.

[Brief explanation of the drawing]

FIG. 1: Circuit layout diagram of an embodiment device of the present invention

[Figure 2] Characteristic diagram when turning the motor on and off using the same device

[Figure 3] Characteristic diagram showing the energization time and energization current characteristics of the motor in the same device

FIG. 4: Circuit layout diagram of another embodiment of the present invention.

[Figure 5]
Conventional circuit diagram

[Figure 6] Characteristic diagram showing the current-carrying time and current-carrying current characteristics of the conventional example

[Explanation of symbols]

1 Current control device 2 Control element 3 Switch 4 Power supply 5 Motor 6 PTC element 7 NTC element

Claims (2)

[Claims] 1. A current control device that is connected to a current-carrying circuit from a power source to a current-controlled object and controls the current flowing to the current-controlled object, wherein the NT exhibits negative resistance near room temperature.
A current control device comprising: a control element consisting of a C element and a PTC element made of an organic or inorganic material; and a switching means for selectively connecting the NTC element or PTC element of the control element to a current-carrying circuit. . 2. The current control device according to claim 1, wherein the NTC element is an oxide whose main component is V2O3.