KR20100011047A - Apparatus for driving load - Google Patents

Abstract

PURPOSE: A load driving device is provided to drive a load with large capacity by operating a power device with suitable capacity according to the size change of the load. CONSTITUTION: A load driver(120) drives first to third loads(110) using one among the first and second power devices. A controller(130) controls the current flow of the load driver by controlling the operation of the first and second power devices according to the size change of the one of the first and third loads. The first and third loads are serially connected. The negative pole and the positive pole of the first power device are connected to the left and right sides of the second load. The positive pole and the negative pole of the second power device is connected to the right side of the third load and the left side of the first load.

Description

Load driving device {Apparatus for Driving Load}

The present invention relates to a load driving device. More specifically, the present invention relates to a load driving apparatus that provides a load driving apparatus capable of efficiently driving a large-capacity and largely varying load even with a small capacity power supply.

Conventional load driving device is a device that supplies a constant voltage or current to the load by using a power supply device, the maximum voltage and the maximum current of the power supply device is determined according to the load size of the load to be driven. In addition, one or more switches may be used to adjust the power supply of the power supply. These switches must be able to withstand the maximum voltage of the power supply.

If the load capacity is large and the load size changes in a very wide range, there is a problem that the load driving device must have a power supply device having a very high maximum voltage and maximum current in accordance with the characteristics of the above-described load.

For this reason, the load driving apparatus has to use an expensive high voltage switch having a high withstand voltage, and has a problem of using an expensive wiring having a high insulation voltage. In addition, the high-voltage switch is inevitably increased in volume, resulting in a problem of increasing the volume of the load driving device.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a load driving device capable of efficiently driving a large-capacity and largely varying load even with a small capacity power supply device.

Another object of the present invention is to provide a load driving device with a low cost and a high volume while being able to drive a large capacity and a large variable load.

According to an aspect of the present invention for achieving the above object, in the load driving device, the first load, the second load and the third load to the first load, the second load and the third load by one or more of the power supply device of the first power supply device and the second power supply device; A load driver for driving in a step or a second step; And controlling the current flow of the load driver by controlling operations of the first power supply device and the second power supply device according to a change in the size of at least one of the first load, the second load, and the third load. And a control unit, wherein the first load, the second load, and the third load are connected in series, and the negative and positive poles of the first power supply are connected to left and right sides of the second load. It is connected to each other, and the load driving device, characterized in that the (+) pole and (-) pole of the second power supply are respectively connected to the left side of the first load and the right side of the third load.

As described above, according to the present invention, there is an effect of providing a load driving apparatus capable of efficiently driving a large-capacity and largely varying load by operating a power supply unit having a suitable capacity in accordance with a change in load size.

In addition, according to the present invention, it is possible to drive a large-capacity and largely varying load, and there is an effect of providing a load driving apparatus with low cost and volume.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function is obvious to those skilled in the art or may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a view showing a load driving device 100 according to an embodiment of the present invention.

As shown in FIG. 1, the load driving apparatus 100 according to an embodiment of the present invention loads in accordance with a change in the load size of the load driver 120 and the load 110 for driving the plurality of loads 110. And a controller 130 for controlling the driver 120. However, the plurality of loads 110 includes a first load, a second load, a third load, and the like.

The load driver 120 drives the first load, the second load, and the third load to a first stage or a second stage, which is a load driving stage to be described later, using at least one of the first and second power supplies. .

The controller 130 controls the operation of the first power supply device and the second power supply device according to a change in the load size of at least one of the first load, the second load, and the third load to control the current flow of the load driver 120. To control.

Hereinafter, a circuit to which the first power supply device, the second power supply device, the first load, the second load, and the third load are connected is referred to as a "load driving circuit", and a power supply of at least one of the first power supply device and the second power supply device is referred to. Driving the first load, the second load and the third load with the device in a first or second stage means that the load driving circuit is driven in a "first phase" or "second phase".

In the above-described load driving circuit, the first load, the second load and the third load are connected in series, and the negative and positive poles of the first power supply are connected to the left and the right of the second load among the connected loads. The poles are respectively connected, and the positive pole and the negative pole of the second power supply are connected to the left side of the first load and the right side of the third load, respectively.

The controller 130 controls both the first power supply device and the second power supply device to operate when a load size of at least one of the first load, the second load, and the third load changes to be less than or equal to a predetermined threshold value, and the load If the magnitude changes beyond the predefined threshold, only the second power supply is controlled to operate.

If the load size of one or more of the first load, the second load, and the third load is changed to be equal to or less than a predetermined threshold value, and both the first power supply device and the second power supply device operate by the controller 130, the load driver 120 drives a first load, a second load, and a third load. The driving stage of the load driving circuit at this time is referred to as "first stage".

On the contrary, if the load size of one or more of the first load, the second load, and the third load changes beyond a predetermined threshold, and only the second power supply is operated by the controller 130, the load driver 120 may operate. The first load, the second load, and the third load are driven in series. The driving stage of the load driving circuit at this time is called "second stage".

The above-mentioned "threshold value" is a load size in which the current flowing in the first power supply starts exceeding the maximum current of the first power supply (hereinafter also referred to as 'current capacity'), and the maximum current of the first power supply, It is determined by the capacity such as maximum voltage or maximum power.

The second power supply described above has a maximum current (or capacity) that is greater than the maximum current (or capacity) of the first power supply.

On the other hand, in order to drive the load in a range exceeding the maximum current or capacity of the second power supply device, the second power supply unit has one or more other power supply units having a maximum current (or capacity) greater than the maximum current (or capacity) of the second power supply device. Can be connected in parallel to the power supply.

The first load, the second load, and the third load mentioned above may each include one or more loads, and any other element or device such as a motor having a resistive load or a resistive component or equivalent to the resistive component. Can be.

By using the load driving apparatus 100 according to the embodiment of the present invention described above, by operating a power supply unit having a suitable capacity in accordance with the change in load size, it is possible to efficiently drive a large capacity and a large variable load It works.

In addition, the use of the load driving device 100 according to the embodiment of the present invention described above has the effect of providing a load driving device 100 having a low cost and a small volume while driving a large capacity and a large variable load. .

2 is a view showing a load driving circuit according to an embodiment of the present invention.

FIG. 2 is a view illustrating a load driving unit 120 included in a load driving device 100 according to an embodiment of the present invention, driven by a first power supply PS1, and a second power supply PS2. ), A load driving circuit including a first load r1, a second load r2, and a third load r3.

Referring to FIG. 2, in the load driving circuit, the first load r1, the second load r2, and the third load r3 are connected in series. (-) And (+) poles of the first power supply PS1 are connected to the left and right sides of the second load r2, respectively. In addition, the positive and negative poles of the second power supply PS2 are connected to the left side of the first load r1 and the right side of the third load r3, respectively.

The load driving circuit configured in the above-described manner detects a change in the load size of at least one of the first load r1, the second load r2, and the third load r3 and accordingly the first power supply PS1 and The controller 130 may control the operation of the second power supply device PS2 to be driven in the first or second stage.

3 is a view showing a driving step of a load driving circuit according to an embodiment of the present invention.

3 (a) and 3 (b) show a first stage and a second stage of the load driving circuit in which the load driving circuit shown in FIG. 2 can be driven due to the control of the controller 130, respectively. .

In a first step of the load driving circuit shown in FIG. 3A, at least one of the first load r1, the second load r2, and the third load r3 is changed from a predetermined load size to a threshold value. Is driven. Here, the threshold value is a load size at which the current supplied from the first power supply PS1 starts to exceed the maximum current (or current capacity) of the first power supply PS1.

Referring to FIG. 3A, in the first step of the load driving circuit, the control unit 130 operates both the first power supply PS1 and the second power supply PS2 so that the first load r1 and the first load r1 and the second power supply PS2 are operated. The second load r2 and the third load r3 are driven. Here, the maximum current (or current capacity) of the second power supply device PS2 is greater than the maximum current (or current capacity) of the first power supply device PS1.

An arrow shown in the first step of the load driving circuit of (a) a 3 denotes a current direction, i or i 2 shown with an arrow indicates a current intensity proportionally.

Referring to FIG. 3A, in order to allow a current having the same current intensity but the opposite direction to flow to the second load r2 compared to the current i generated by the second power supply PS2. The first power supply PS1 is connected to the second load r2 to have a polarity opposite to that of the second power supply PS2. In addition, the first power supply (PS1) is supplying a current (i 2) of twice the supplied current (i) by a second power supply (PS2).

While the load driving circuit shown in (a) of FIG. 3 is driven in the first step, for example, when the load magnitude of the second load r2 decreases, the current i flowing in the second load r2 becomes Increases. If the load size of the second load r2 is reduced to a threshold value, the current 2 i supplied from the first power supply PS1 is equal to the maximum current (or current capacity) of the first power supply PS1. To reach. In this case, the control unit 130 stops the operation of the first power supply PS1 and operates only the second power supply PS2 so that the load driver 120 changes the driving step to the second step following the first step. The first load r1, the second load r2, and the third load r3 are driven in series. As described above, the load driving circuit for supplying current i ' to the first load r1, the second load r2, and the third load r3 connected in series by operating only the second power supply PS2 is performed in the second step. As shown in FIG. 3 (b).

4 is a graph illustrating a voltage and a current at a load according to a change in load size.

FIG. 4 is a diagram for explaining a driving step of a load driving circuit according to a load size, wherein the first load r1, the second load r2, and the third load r3 are equally 300? ) And changes the voltage and current flowing across the second load r2 according to the change in the load size of the second load r2 among these loads from 10 Ω (point B) to 0.1 Ω (point C). It is a graph shown. In addition, it is assumed that the first power supply PS1 and the second power supply PS2 have started to supply a voltage of 300V.

In addition, in FIG. 4, it is assumed that the first power supply PS1 has a maximum voltage of 300V, a maximum current (current capacity) of 20A, and a maximum power of 6KW.

When the load size of the second load r2 decreases, the voltage supplied from the first power supply PS1 gradually decreases and the current supplied from the first power supply PS1 gradually increases. When the current supplied from the first power supply PS1 gradually increases to supply the current of 20A, which is the maximum current (or current capacity), since the current of 10A flows to the second load r2, the voltage of 100V is applied. The load magnitude of the second load r2 at this time is 10 Ω, which is a threshold value in the load driving circuit which is the point of changing from the first step to the second step.

Therefore, when the load size of the second load r2 changes from the point A of 300 Ω to the point B of the threshold 10 Ω, the load driving circuit is driven in the first stage, and the load size of the second load r2 is the threshold value. The point greater than 10 Ω, that is, from point B to point C is driven in a second step.

FIG. 5 is a graph illustrating a voltage and a current supplied from the first power supply PS1 according to a change in the load size illustrated in FIG. 4. In the following, the driving steps (first step and second step) of the load driving circuit will be described with reference to Figs. 3A and 3B.

FIG. 5 shows the voltage and current at the first power supply PS1 when the load magnitude of the second load r2 illustrated in FIG. 4 varies from 300 Ω (point A) to 10 Ω (threshold) (point B). Is a graph showing the change of. As described above, the first power supply PS1 operates ON only in the first step (FIG. 3A) of the load driving circuit.

Referring to FIG. 5, when the load size of the second load r2 is gradually decreased at 300 Ω, the current supplied from the first power supply PS1 gradually increases at 2A, and the load size of the second load r2 is increased. When 10 Ω (threshold) is reached, the current supplied from the first power supply PS1 increases to 20 A. At this time, since 20A is assumed to be the maximum current (or current capacity) of the first power supply PS1, the point where 20A current is supplied from the first power supply PS1, and the load size of the second load r2 is 10Ω. The operation of the first power supply PS1 is stopped (OFF) at the point B which becomes the (threshold value).

Referring to FIG. 5, at the point B where the load magnitude of the second load r2 is 10 Ω (threshold), that is, the point B changed from the first stage to the second stage, the voltage applied to the second load r2 is The current flowing through the second load r2 is 100 V, which is 10 A, which is half of the current 20 A supplied by the first power supply PS1.

FIG. 6 is a graph illustrating a voltage and a current supplied from the second power supply PS2 according to the change in the load size illustrated in FIG. 4.

FIG. 6 shows a second power supply when the load magnitude of the second load r2 illustrated in FIG. 4 varies from 300 Ω (point A) to 10 Ω (threshold value) (point B) to 0.1 Ω (point C). The graph which shows the change of the voltage and current supplied by PS2. As described above, the second power supply PS1 operates ON in both the first step (Fig. 3 (a)) and the second step (Fig. 3 (b)) of the load driving circuit.

Referring to FIG. 6, the first stage in which the first power supply PS1 also operates together, that is, the load magnitude of the second load r2 is from 300 Ω (point A) to 10 Ω (threshold) (point B). In the section, the change in the voltage supplied from the second power supply PS2 shows the same change in voltage (300V-> 100V) as the first power supply PS1. On the other hand, the change in the current supplied from the second power supply PS2 is somewhat different from the change in the current of the first power supply PS1. The magnitude of the change in current is half the direction of the current.

Therefore, at the point B where the load magnitude of the second load r2 is 10 Ω (threshold), that is, the point B changed from the first step to the second step, the voltage supplied from the second power supply PS2 is 100V. The current supplied from the second power supply PS2 is 10A, which is half of the current 20A supplied from the first power supply PS1. In addition, the voltage applied to the second load r2 at the point B is 100V, and the current flowing in the second load r2 is 10A, which is half of the current 20A supplied by the first power supply PS1.

When the load size of the second load r2 is 10 Ω or more, that is, when the load driving circuit is driven in the second stage, the first power supply PS1 is turned off and only the second power supply PS2 is operated. (ON).

In particular, immediately before the change to the second stage, the voltage of 100 V was applied to the second load r2, and the same voltage of 100 V was applied to the first load r1 and the third load r3. At the beginning of the phase, the second power supply PS2 must supply the load driving circuit with 300V, which is the sum of the voltages applied to each of the first load r1, the second load r2, and the third load r3. . Therefore, in the voltage current graph shown in FIG. 6, when the current is 10A, the voltage supplied by the second power supply PS2 rises vertically from 100V to 300V (X point). Therefore, the first stage and the second stage may exist in the second power supply device PS2 at the point B where the load magnitude of the second load r2 is 10 Ω (threshold). That is, the second power supply PS2 supplying voltages and currents of 100 V and 10 A is the second power supply PS2 operating in the first step, while the second power supply PS2 operates at the first stage, while at the X point supplying the voltages and currents of 300 V and 10 A. The second power supply PS2 is the second power supply PS2 operating in the second step.

In the section after the X point where the load size of the second load r2 is 10 Ω, since the load size of the second load r2 continues to decrease, the voltage applied to the second load r2 as shown in the graph of FIG. 7. Decreases and the current flowing in the second load r2 increases.

When the load size of the second load r2 decreases to 0.1 Ω, the second power supply PS2 must supply 100A of current. When the load size of the second load r2 is further reduced and smaller than 0.1?, The second power supply PS2 must supply more current than 100A.

If it is assumed that the second power supply PS2 has a maximum voltage of 300 V, a maximum current (current capacity) of 100 A, and a maximum power of 30 KW, since the second power supply PS2 cannot supply more current than 100 A, It is not possible to drive the second load r2 having a load size smaller than 0.1?.

Therefore, when the second load r2 is to be driven even in a situation where the load size of the second load r2 is smaller than 0.1?, The current capacity of the second power supply PS2 must be greater than 100A. Alternatively, if the second power supply PS2 having a current capacity of 100 A is used as it is, another power supply having a current capacity greater than 100 A may be further connected in parallel with the second power supply PS2 to be larger than 0.1 Ω. It is also possible to drive the second load r2 of small load size. If another power supply is additionally connected, another driving stage other than the first stage and the second stage is added.

7 is a flowchart illustrating a method of configuring a load driving circuit according to an embodiment of the present invention.

Referring to FIG. 7, a method of configuring a load driving circuit according to an embodiment of the present invention includes a load connecting step S700, a first power supply connecting step S702, a second power supply connecting step S704, and the like. .

In the load connection step S700, the first load, the second load, and the third load are connected in series.

In the first power supply connection step (S702), the (-) and (+) poles of the first power supply are connected to the left and right sides of the second load, respectively.

In the second power supply connection step (S704), the (+) and (-) poles of the second power supply are connected to the left side of the first load and the right side of the third load, respectively.

In FIG. 7, a method of configuring a load driving circuit according to an embodiment of the present invention is illustrated in the order of load connection step S700, first power device connection step S702, and second power device connection step S704. For the convenience of description, the order may be changed without departing from the essential characteristics of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 is a view showing a load driving apparatus according to an embodiment of the present invention,

2 is a view showing a load driving circuit according to an embodiment of the present invention;

3 is a view showing a driving step of a load driving circuit according to an embodiment of the present invention;

4 is a graph showing a voltage and a current at a load according to a change in load size;

FIG. 5 is a graph illustrating voltages and currents supplied from a first power supply according to a change in the load size illustrated in FIG. 4;

FIG. 6 is a graph illustrating voltages and currents supplied from a second power supply according to a change in the load size illustrated in FIG. 4;

7 is a flowchart illustrating a method of configuring a load driving circuit according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: load driving device 110: load

120: load driving unit 130: control unit

210: first power supply device 220: second power supply device

Claims (4)

In a load drive device, A load driver configured to drive the first load, the second load, and the third load by at least one of the first power supply device and the second power supply device; And A control unit controlling the current flow of the load driving unit by controlling operations of the first power supply device and the second power supply device according to a change in the load size of at least one of the first load, the second load, and the third load Including but not limited to: The first load, the second load and the third load are connected in series, and the (-) and (+) poles of the first power supply are respectively connected to the left and right sides of the second load. And a (+) pole and a (−) pole of the second power supply are respectively connected to the left side of the first load and the right side of the third load. The method of claim 1, The control unit, When the load size changes below the threshold value, the first power supply and the second power supply are controlled to operate, and when the load size changes beyond the threshold value, the second power supply is controlled to operate. Load driving device. The method of claim 2, When the first power supply device and the second power supply device are both operated by the control unit, the load driving unit drives the first load, the second load, and the third load, The load driving device drives the first load, the second load, and the third load in series when the second power supply device operates only by the controller. The method of claim 2, The threshold is The load driving device, characterized in that the current supplied from the first power supply is a load size that begins to exceed the maximum current of the first power supply, it is determined by the maximum current of the first power supply.

Images