KR20150004023A - VARIABLE ElECTRIC LOAD - Google Patents

Abstract

The present invention relates to a large variable electronic load capable of precisely varying a resistance value in a sliding manner. The variable electronic load according to a preferable embodiment of the present invention comprises: a variable load having a plurality of fixed taps; a control unit for determining the fixed tap, to which a movable tap is connected, among the fixed taps provided on the variable load to vary a resistance value of the variable load; and a motor for connecting the movable tap to the fixed tap determined by the control unit by rotating according to the control of the control unit to move the movable tap in a sliding manner.

Description

[0001] VARIABLE ELECTRIC LOAD [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a large-capacity variable-type electronic load, and more particularly, to a large-capacity variable-type electronic load that can easily increase a capacity and accurately change a resistance value by a sliding method.

Power devices, such as generators, transformers, reactors, etc., used in ships, offshore plants, power systems, etc., must be capable of operating in a variety of load environments. Therefore, the power device undergoes a load test and tests the performance of the power device while varying the load characteristics (load, power factor, etc.) in the load test. Therefore, the load testing device should provide a variable reactive power load and a variable reactive power load together so that it can reflect the characteristics of the load connected to the generator.

At this time, a variable electronic load is used to provide a variable active power load.

However, the conventional variable type electronic load has a problem that it is not easy to move for variable due to the generation of heat, and it is difficult to increase the capacity, so that the price increases sharply in the case of a large capacity.

Accordingly, it is an object of the present invention to provide a variable-type electronic load which can easily be expanded in capacity and which is easy to move for variable use.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to another aspect of the present invention, there is provided a variable electronic load including a plurality of fixed tabs, the variable load having a plurality of fixed tabs, A control unit for determining a fixed tap to which the movable tab is to be connected among the fixed tabs of the fixed tab, the movable tab being rotated by the control of the control unit to move the movable tab in a sliding manner, thereby connecting the movable tab to the fixed tab determined by the control unit Motor.

Here, the motor further includes a three-dimensional cam connected to the shaft of the motor, the three-dimensional cam having a spiral inclined groove formed on an outer surface thereof, and a moving rod accommodating the three-dimensional cam on the inner side and having a protrusion inserted into the inclined groove, The protrusion is moved up and down along the inclined groove when the three-dimensional cam is rotated, the moving tab is fixed to the upper side of the moving rod, and the moving tab can move up and down according to the upward and downward movement of the moving rod.

The stereoscopic cam further includes a reflection plate attached to an outer circumferential surface of the stereoscopic cam and an optical sensor disposed at a position opposite to the reflection plate, wherein the control unit calculates the rotation speed of the motor for varying the resistance value of the variable rod, And the control unit changes the resistance value of the variable rod by counting the number of revolutions of the motor using the amount of light reflected by the reflector among the light emitted by the optical sensor, can do.

The movable tab may include a first contact portion and a second contact portion that are in close contact with both sides of the fixed tab, and the first contact portion and the second contact portion may correspond to the groove on the fixed tab, And a rounded surface to be rounded.

In addition, a plurality of fixing tabs may be provided between adjacent fixing tabs, both side surfaces of which have rounded surfaces protruding outward, and both side surfaces thereof are located on the outermost periphery of the fixing tabs, It is possible to prevent short-circuiting between the neighboring fixed tabs.

As described above, according to the present invention, since the movable tab is moved in a sliding manner and connected to any one of the plurality of fixed tabs on the variable rod, movement for varying the resistance value can be desired. Further, since the coil resistor is used as the variable rod, the length of the coil to be wound can be varied to facilitate capacity addition.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of a variable-type electronic load according to a preferred embodiment of the present invention. Fig.
Fig. 2 is a view showing the details of the mutual arrangement of the fixed tab, the insulating member, and the moving tab in the direction in which the variable rod is viewed from the guide rod side in Fig.
3 is a functional block diagram of the control unit of Fig.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

The present invention is advantageous in that movement for varying the resistance value can be desired by connecting the movable tab to any one of the plurality of fixed tabs on the variable rod while moving in the slide manner. Further, since the coil resistor is used as the variable rod, the length of the coil to be wound can be varied to facilitate capacity addition.

Hereinafter, a variable electronic load according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 3 attached hereto. Hereinafter, in order to make the gist of the present invention clear, a description of well-known matters will be omitted or simplified. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of a variable-type electronic load according to a preferred embodiment of the present invention. Fig. Fig. 2 is a view showing the details of the mutual arrangement of the fixed tab, the insulating member, and the moving tab in the direction in which the variable rod is viewed from the guide rod side in Fig. 3 is a functional block diagram of the control unit of Fig.

Referring to FIG. 1, the variable electronic load may include a variable rod 10. A coil resistor may be used for the variable rod 10. As is well known, the coil resistor may be formed by winding a resistance wire (not shown) such as a manganese wire, a nichrome wire, or the like on an insulating bar (for example, a ceramic bar, not shown). It may be desirable to implement a coil resistor with a noninductive resistance so that the inductance is minimized.

A first fixing tab 700a, a second fixing tab 700b, a third fixing tab 700c, and a plurality of fixing tabs 700b spaced up and down at predetermined intervals on the resistance line of the variable rod 10, 4 fixing tab 700d can be connected. The resistance value of the variable rod 10 can be varied by varying the length of the resistance wire on the variable rod 10 forming the closed loop according to the fixed tab to which the moving tab 210 is connected. Here, the resistance value may mean a resistance value located on the closed loop when power is applied during the load test. Hereinafter, for convenience of explanation, it is assumed that there are four fixed tabs, but the present invention does not limit the number of fixed tabs. An insulating member, for example, a first insulating member 800a, a second insulating member 800b, and a third insulating member 800c may be provided between the upper and lower fixing tabs.

The movable tab 210 may move up and down and may be connected to any one of the plurality of fixed tabs 700a, 700b, 700c, and 700d at the moved position to vary the resistance value of the variable rod 10 . That is, the resistance value of the variable load 10 used for the load test can be varied. The moving tab 210 includes a hollow main body 211 and a contact portion 212 protruding outside the main body 211. The moving tab 210 may be in close contact with the guide rod 100 to be electrically connected to the guide rod 100. The guide rod 100 may be electrically connected to the lead wire 20 through the connection part 110. [ The movable tab 210 can be electrically connected to any one of the plurality of fixed tabs while moving up and down while being electrically connected to the guide rod 100.

Referring to FIG. 2, the moving tab 210 may include a first contact portion 212a and a second contact portion 212b that are in close contact with both sides of the fixing tab 700a. The first contact portion 212a and the second contact portion 212b may have a rounded protrusion opposed to the rounded groove on the fixing tab 700a on the surface opposed to the fixing tab 700a. This increases the contact surface between the first contact portion 212a and the second contact portion 212b and the fixing tab 700a to decrease the contact resistance between the first contact portion 212a and the second contact portion 212b and the fixing tab 700a And the first contact portion 212a and the second contact portion 212b can be tightly fixed to the fixing tab 700a more stably. In order to more accurately vary the resistance value of the variable rod 10, the present invention can provide a large number of fixing tabs. At this time, the gap between the upper and lower fixing tabs may be 1.5 times or more of the coil gap. In this case, when the widths of the fixing tabs and the moving tabs are increased in order to reduce the contact resistance between the fixing tabs and the moving tabs, the interval between the fixing tabs is narrow, so that shorting may occur between the upper and lower fixing tabs . In order to prevent this, an insulating member (a first insulating member 800a, a second insulating member 800b, and a third insulating member 800c) may be provided between upper and lower fixing tabs. Further, both side surfaces of the insulating member have rounded surfaces protruding outward, and the rounded surfaces can be located at the outermost edges of the fixing tabs. As a result, the first contacting portion 212a and the second contacting portion 212b are separated from each other by the rounded surface located at the outermost periphery of the fixing tab at the time of vertically moving the contacting portion 212, . 2 shows a state in which the first contact portion 212a and the second contact portion 212b are separated from each other by the second insulating member 800b while the contact portion 212 is moving from the first fixing tab 700a to the third fixing tab 700c Respectively. Further, the insulation member can prevent the projection on the moving tab from being caught between the fixing tabs when the moving tab is moved by the rounded surface outwardly, thereby preventing the movement of the moving tab from being disturbed.

1, the main body 211 of the moving tab 210 accommodates the guide rod 100 in the inside thereof, and can move up and down along the guide rod 100. The guide rod 100 includes a connecting portion 110 extending to one side and a lead wire 20 can be connected to one side of the connecting portion 110. [ With this structure, the voltage on the lead wire 20 can be transmitted to the variable rod 10 via the guide rod 100, the movable tap main body 211, the contact portion 212, and the fixed tab in sequence.

The control unit 500 may include a tap determination unit 510 and a motor control unit 520.

The tap determining unit 520 can determine the fixed tap to which the movable tab 210 is connected so that the variable rod 10 has the resistance value based on the resistance value input from the outside. At this time, the tap determining unit 520 can determine the fixed tap to which the moving tab 210 is connected according to the resistance value inputted from the outside, using the resistance value related information according to the previously stored fixed tab. Alternatively, an algorithm for determining a fixed tap may be implemented using a previously stored resistance value as a variable, and the fixed tap to which the moving tap 210 is to be connected may be determined using the algorithm.

The motor control unit 520 can move the moving tab 210 to the determined fixed tap position by driving the motor 310.

The motor 310 can rotate the shaft 311 in the clockwise and counterclockwise directions. The three-dimensional cam 320 may be fixed to the shaft 311 of the motor 310. A spiral inclined groove 321 may be formed on the outer surface of the three-dimensional cam 320. [ The stereoscopic cam 320 can rotate along the motor shaft 311. [ A hollow moving rod 900 may be positioned outside the stereoscopic cam 320. An upper portion of the moving rod 900 may be fixed to a lower portion of the moving tab body 211. The moving rod 900 accommodates the three-dimensional cam 320 on the inner side, and a protrusion 910 may be provided on the inner peripheral surface thereof. The protrusion 910 is inserted into the inclined groove 321 and moves up and down along the inclined groove 321 when the stereoscopic cam 320 rotates so that the movable bar 900 can move up and down. The movable tab 210 can be moved up and down by the up and down movement of the movable rod 910. [ It is preferable that the inclined grooves 321 are formed so that the movable tab 210 can be moved from the present position to the upper or lower fixed tab by one rotation of the cubic cap 320 during design. 1, when the motor moves clockwise, the moving rod 900 moves upward along the inclined groove 321, and when the motor rotates in the counterclockwise direction, the moving rod 900 can be moved downward.

The reflection plate 410 may be provided on the outer surface of the stereoscopic cam 320. An optical sensor 420 may be installed at a position opposite to the reflection plate 410. The light sensor 420 includes a light emitting element and a light receiving element, and the light receiving element can collect an amount of the light emitted from the light emitting element reflected through the reflection plate 410. The reflection plate 410 can be returned to the initial position at each initial rotation of the stereoscopic cam 320, In such a structure, the output value of the light receiving element at the initial position of the reflection plate 410 can be maximized.

The tab determining unit 510 can determine the number of revolutions of the stereoscopic cam 320 when the moving tab 210 is expressed by the number of revolutions of the motor shaft when determining the fixing tab to be connected. The rotational direction of the motor shaft 311 can be determined in accordance with the moving direction of the moving tab 210. [ The motor control unit 520 can control the motor 310 so that the motor shaft 311 can rotate by the determined rotation direction and the determined number of rotations. At this time, the motor control unit 520 counts the number of rotations of the motor shaft 311 based on the output value of the optical sensor 420, and controls the motor shaft 311 to rotate by the determined number of rotations based on the counted number of rotations The motor can be controlled.

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

10: variable load
20: Lead wire
100: guide rod
110:
210: Go tab
211: Body
212:
212a: first contact
212b:
310: motor
311: Motor shaft
320: stereoscopic cam
321:
410: reflector
420: Light sensor
500:
510:
520: Motor control section
700a: first fixing tab
700b: second securing tab
700c: third fixing tab
700d: fourth fixing tab:
800a: first insulating member
800b: second insulating member
800c: third insulating member
900:
910:

Claims (5)

In the large-capacity variable-type electronic load,
A variable rod having a plurality of securing tabs
A control unit for determining a fixed tap to which the movable tap is to be connected among the plurality of fixed taps provided on the variable rod to vary the resistance value of the variable rod,
And a motor that is rotated by the control of the control unit to move the moving tab in a sliding manner to connect the moving tab to the fixed tab determined by the control unit. The method according to claim 1,
A three-dimensional cam connected to a shaft of the motor and having a spiral inclined groove formed on an outer surface thereof, and
Further comprising a moving rod which receives the stereoscopic cam on an inner side thereof and has a protruding portion inserted into the inclined groove on an inner side thereof, wherein the protruding portion moves up and down along the inclined groove when the stereoscopic cam is rotated,
The moving tab is fixed to the upper side of the moving rod,
And the moving tab moves up and down in accordance with the upward and downward movement of the moving rod. 3. The method of claim 2,
A reflection plate attached to an outer peripheral surface of the three-dimensional cam;
Further comprising an optical sensor disposed at a position opposite to the reflection plate,
Wherein the control unit calculates the number of revolutions of the motor for varying the resistance value of the variable load and varies the resistance value of the variable load by rotating the motor by the calculated number of revolutions,
Wherein the controller counts the number of revolutions of the motor using an amount of light reflected by the light sensor through the reflector. The method of claim 3,
Wherein the movable tab includes a first contact portion and a second contact portion that are in close contact with both sides of the fixed tab, and wherein the first contact portion and the second contact portion are formed on a surface facing the fixed tab, Wherein the first electrode has a true surface. 5. The method of claim 4,
Wherein the fixing tabs have rounded surfaces that are protruded outward from both sides of the plurality of fixing tabs, and both side surfaces thereof are located at outermost sides of the fixing tabs, and when the moving tabs are moved up and down, And prevents a short between adjacent fixing tabs.

Images