WO2017188489A1 - Device for removing inductive kickback voltage for phase-off control - Google Patents

Abstract

Disclosed is a device for removing an inductive kickback voltage for phase-off control. The device comprises: a discharge circuit portion connected in parallel to a load so as to perform a switching-on operation during phase-off control of an AC voltage signal, thereby discharging an inductive kickback voltage formed by the load; a voltage supply portion that performs a switching-on operation during phase-off control of the AC voltage signal, thereby forms a predetermined voltage (V_ac2) across both ends thereof, and drops the inductive kickback voltage across both ends of the discharge circuit portion to a voltage (V_ac1); and a controller that controls switching-on of the discharge circuit portion and that of the voltage supply portion, respectively, during the phase-off control such that the same are turned on. The device for removing an inductive kickback voltage for phase-off control described above is advantageous in that the discharge circuit portion is connected in parallel to a load such that the entire inductive kickback signal (or energy) is discharged at the time of phase-off control, making it possible to perform efficient phase control with no inductive kickback phenomenon. Meanwhile, when the magnitude of the inductive kickback voltage is larger than a predetermined discharge threshold voltage, the voltage supply portion is used to form a low voltage across the discharge circuit portion according to the voltage division rule. This is advantageous in that, by lowering the inductive kickback voltage having a comparatively large magnitude, the inductive kickback energy can be reduced efficiently within a short period of time.

Description

Inductive Kickback Voltage Rejector for Phase-Off Control

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase-off control apparatus, and more particularly, to an inductive kickback voltage removing device for removing an inductive kickback voltage generated during phase off control.

Phase control refers to control that passes or cuts current in a specific phase in an AC power signal, which is used to lower the average voltage or adjust the average power.

There are two types of phase control: phase-on control and phase-off control.

1 is a timing diagram of phase on control, and FIG. 2 is a timing diagram of phase off control.

Referring to FIG. 1, in the phase-on control, a voltage signal is output by proportionally dividing a phase of 0 ° to 90 ° in a half cycle of an AC voltage, and outputting a voltage signal at 90 ° to 180 °. In the phase region is configured to always output a voltage signal. In Fig. 1, phase on control is started at 44 ms, 216 ms, 388 ms, and 603 ms, respectively, and the voltage signal after each point in time is configured to pass.

That is, the phase-on control is configured to set a phase at the time of passing the voltage signal to control the pass area of the voltage signal or the magnitude thereof, thereby obtaining a desired average voltage or average power.

Meanwhile, referring to FIG. 2, in the phase-off control, a voltage signal is always output in a phase region of 0 ° to 90 ° in a half cycle of an AC voltage, and a voltage signal is proportional in a phase region of 90 ° to 180 °. It is configured to output by splitting control. In FIG. 2, phase on control is started at 130 ms, 302 ms, 474 ms, and 646 ms, respectively, and is configured such that all voltage signals up to each point in time pass through the cycle.

In this way, the phase-on control method or the phase-off control method sets the pass area of the voltage signal by adjusting the phase-on time and the phase-off time, respectively, and the same result is obtained regardless of which method is used.

However, the phase on control method and the phase off control method have disadvantages, respectively.

First, in the case of the phase-on control method, a large voltage is suddenly applied at a phase-on time, thereby causing impulse noise.

In addition, in the phase-off control method, there is a problem that an inductive kickback phenomenon occurs when the load is an inductive load instead of a resistive load.

3 is a timing diagram of an inductive kickback waveform generated in a conventional phase off control.

As shown in FIG. 3, it can be seen that a kickback phenomenon occurs in which the voltage signal is not blocked smoothly at each phase off control time point, but rather the magnitude of the voltage signal is increased. Such inductive kickback occurs in the case of inductive loads, and inversely, electromotive force is generated by the inductance of the inductive loads, which prevents efficient blocking of the voltage signal. Inductive kickback not only generates Electro Magnetic Interference (EMI) but also causes component failure.

In the case of the phase-off control method, there is a fatal problem that it is impossible to block the voltage signal at the time when the voltage signal needs to be blocked, thereby not properly performing the function of the phase control. On the other hand, the phase-on control method has a disadvantage of generating impulse noise, and there is a problem in that a noise canceling filter must be provided to remove it, but it is faithful to its original function of blocking a voltage signal by phase control.

Therefore, in the conventional phase control, the phase on control method has been adopted, and even more so in the case of inductive load. In the literature such as Korean Patent Publication No. 10-0948736 or Korean Patent Publication No. 10-1455782, the term phase control itself is generally used in place of phase on control using a phase on control method.

However, if the phase-off control method can only solve the inductive kickback phenomenon, it can be considered as a more efficient control method because it causes little noise or other problems.

It is an object of the present invention to provide an inductive kickback voltage cancellation device for phase off control.

According to the present invention, the inductive kickback voltage can be efficiently removed by discharging the voltage signal generated across the load due to the inductive kickback.

According to the above-described inductive kickback voltage removing device for phase-off control, the discharge circuit unit is connected to the load in parallel to discharge all the inductive kickback energy at the phase-off control time, thereby smoothly inducing the phase without the inductive kickback phenomenon. There is an effect that can perform control. In particular, when compared to the phase-on control method, noise impulses do not occur, and thus it is not necessary to separately provide a noise removing filter. On the other hand, when the magnitude of the inductive kickback voltage is larger than a predetermined discharge threshold voltage, a low voltage is formed in the discharge circuit portion according to the voltage division principle by using the voltage supply unit, thereby reducing the relatively large inductive kickback voltage and making it efficient in a short time. This has the effect of reducing inductive kickback energy.

1 is a timing diagram of phase on control.

2 is a timing diagram of phase off control.

3 is a timing diagram of an inductive kickback voltage waveform generated in a conventional phase off control.

4 is a block diagram of an inductive kickback voltage removing device for phase off control according to an embodiment of the present invention.

5 is a detailed configuration diagram of a discharge circuit unit according to an embodiment of the present invention.

6 is a detailed configuration diagram of a voltage supply unit according to an embodiment of the present invention.

Inductive kickback voltage removing device for phase off control to achieve the object of the present invention, is connected in parallel to the load (load), induction by performing a switching on operation when the supply of the AC voltage signal is cut off during phase off control And a discharge circuit unit for discharging a voltage signal formed at both ends by an inductive kickback, and a controller for switching on and controlling the discharge circuit unit during the phase-off control.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

Terms such as first, second, A, and B 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 the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination 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. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram of an inductive kickback voltage removing device for phase-off control according to an embodiment of the present invention, FIG. 5 is a detailed block diagram of a discharge circuit unit according to an embodiment of the present invention, and FIG. Detailed configuration diagram of a voltage supply unit according to an embodiment of the present invention.

4 to 6, an inductive kickback voltage canceller for phase-off control according to an embodiment of the present invention (hereinafter referred to as an inductive kickback voltage canceller) 100 may be configured to include an AC bidirectional switch SW ₀ 110, a discharge circuit unit 120, a voltage supply unit 130, a zero-crossing detection unit 140, and a controller 150. have.

The inductive kickback voltage removing device 100 is applied to a phase off control circuit and is configured to perform smooth phase off control by removing an inductive kickback phenomenon caused by an inductive load during a phase off control operation.

The inductive kickback voltage removing device 100 controls the voltage of the inductive kickback signal to be significantly reduced in accordance with the principle of voltage division during phase off control, and the inductive kickback signal is zero crossing of the next cycle. Control to discharge enough until zero-crossing time.

Therefore, the energy due to the inductive kickback from the phase off control point to the end point of the cycle is quickly removed or dissipated.

The inductive kickback voltage removing device 100 is applied to a phase off control circuit so that the phase control can be performed for both resistive loads and inductive loads. In addition, the simple circuit of the inductive kickback voltage removing device 100 has an advantage that the phase control can be efficiently performed without a noise removing filter as in the phase on control circuit.

Hereinafter, the detailed structure is demonstrated.

The AC bidirectional switch SW ₀ 110 is configured to allow or cut off the supply of the AC voltage signal, and is configured to be switched on or switched off by a phase control operation of the controller 150. Can be.

The phase off-control point is an AC bidirectional switch SW ₀ (110) switched off by the phase off control of the controller 150 blocks to be the AC voltage signal flows into the load 10.

The discharge circuit unit 120 is configured to discharge a voltage signal formed at both ends thereof by an inductive kickback of the load 10.

The discharge circuit unit 120 may be configured to be connected to the load 10 in parallel.

The discharge circuit unit 120 may be configured of a discharge resistor R ₁ and an AC bidirectional switch SW ₁ connected in series with each other.

Here, the discharge resistor R1 is composed of a resistor having a very small resistance value, and is configured to discharge most of the AC voltage signal to be input to the load 10 through the discharge circuit unit 120 by this small resistance value. Can be.

The discharging operation may be started by switching on the AC bidirectional switch SW ₁ by the control of the controller 150 at the phase off control point at which the voltage due to the inductive kickback is formed.

On the other hand, this discharge operation is preferably continued from the phase off control time to the next zero-crossing time. The discharge operation can be sufficiently performed to lower the voltage caused by the inductive kickback as much as possible.

The voltage supply unit 130 may be configured to be connected in parallel with the AC bidirectional switch SW ₀ 110.

The voltage supply unit 130 may be configured of a voltage supply resistor R ₂ and an AC bidirectional switch SW ₂ connected in series with each other.

Here, the voltage supply unit 130 may be configured such that the AC bidirectional switch SW ₂ is switched on and turned on by the control of the controller 150 during the phase off control.

The above-mentioned voltage supply resistor R ₂ is configured to form a predetermined voltage V _{ac1 at} both ends thereof, and according to the principle of voltage distribution, a voltage between the voltage supply resistor R ₁ and the discharge resistor R ₂ of the discharge circuit unit 120, respectively. This configuration is for forming V _ac1 and voltage V _ac2 .

The formation of this voltage can be made in the phase off control operation.

At this time, the voltage supply resistor R ₂ may be set to a relatively very high value than the discharge resistor R ₁ . Thus, according to the principle of voltage division, a relatively high voltage V _ac2 is formed in the voltage supply resistor R ₂ , and a relatively very low voltage V _ac1 is formed in the discharge resistor R ₁ .

This is very useful when the inductive kickback voltage is to be sharply lowered below a certain level when the inductive kickback voltage is relatively high. Too high inductive kickback voltage may cause the discharge circuitry 120 to discharge efficiently enough for a short time in one cycle.

Accordingly, the voltage supply unit 130 may be configured to drop the voltage V _ac1 of the discharge circuit unit 120 to a predetermined discharge threshold voltage or less according to the voltage distribution principle.

Meanwhile, at least one of the voltage supply resistor R ₂ and the discharge voltage R1 may be configured as a variable resistor. The magnitude of the inductive kickback voltage may vary depending on the magnitude of the AC voltage signal, the phase-off control point, and the degree of inductive kickback phenomenon, since the variable resistor can sufficiently reduce the inductive kickback voltage under various conditions. .

The zero crossing detection unit 140 may be configured to detect zero crossing of the AC voltage signal. Zero crossing means that the AC voltage signal is converted to a positive or negative value. The zero crossing detection unit 140 may be configured to input a zero crossing detection signal to the control unit 150.

The controller 150 receives the zero crossing detection signal to determine a switching on / switching off point of the AC bidirectional switch SW ₀ 110 or a switching on / switching off point of the discharge circuit unit 120 and the voltage supply unit 130. Can be.

The controller 150 switches on the AC bidirectional switch SW ₀ 110 after a predetermined time after detecting the zero crossing converted from (-) to (+) and at the time when the next zero crossing is detected, the AC bidirectional switch SW ₀ ( Switching off 110 may be configured to perform phase off control every cycle. Here, the phase off control timing may be adjusted according to a desired average voltage or average power.

Specifically, as described above, the controller 150 turns on the voltage supply unit 130 during the phase-off control to set a voltage formed by the inductive kickback to a predetermined discharge threshold voltage. The voltage supply unit 130 may be configured to turn off the voltage supply unit 130 when the voltage V _ac2 is lower than the lower voltage and lower than the discharge threshold voltage.

In addition, the controller 150 may be configured to sufficiently maintain the discharge state by turning on the discharge circuit unit 120 during the phase-off control and turning off the discharge circuit unit 120 when the next zero crossing is detected.

The controller 150 may be separately provided as a configuration for removing the inductive kickback voltage without performing phase off control. In this case, the phase off control timing and the zero crossing timing are input from the existing phase off control configuration, and only the removal operation of the inductive kickback voltage may be separately performed.

The invention is applicable to phase off control in electrical circuit systems.

Claims (10)

A discharge circuit unit connected in parallel to a load and configured to discharge a voltage signal formed at both ends by an inductive kickback when the supply of the AC voltage signal is cut off during phase-off control; And a control unit for switching on and controlling the discharge circuit unit during the phase off control. The method of claim 1, It is connected in parallel to the AC bi-directional switch SW ₀ to allow or cut off the supply of the AC voltage signal during the phase-off control, the voltage for lowering the voltage at both ends of the discharge circuit portion below a predetermined discharge threshold voltage by the principle of voltage distribution Inductive kickback voltage removal device for phase off control, characterized in that it further comprises a supply. The method of claim 1, wherein the control unit, And switch on and control the discharge circuit unit from the phase off control time point to the next zero-crossing time point so as to discharge the voltage signal formed at both ends of the discharge circuit part by the inductive kickback. Inductive kickback voltage cancellation device for phase-off control. It is connected in parallel to the load, and performs a switching-on operation during phase-off control of an AC voltage signal to inductive kickback voltage formed by the load. A discharge circuit unit for discharging; A voltage supply unit configured to perform a switching-on operation during phase-off control of the AC voltage signal to form a predetermined voltage V _ac2 at both ends _{thereof and} to drop the inductive kickback voltage at both ends of the discharge circuit unit to the voltage V _ac1 ; And a controller configured to turn on and turn off each of the discharge circuit unit and the voltage supply unit during the phase off control. The method of claim 4, wherein the voltage supply unit, Inductive kickback for phase off control, characterized in that it is configured to be connected in parallel to the AC bidirectional switch SW ₀ performing a switching off operation to cut off the supply of the AC voltage signal from a phase off control time until the next zero crossing time. Voltage rejection device. The method of claim 4, wherein the discharge circuit unit, A discharge resistor R ₁ for forming a voltage V _ac1 at both ends by the voltage supply part and an AC bidirectional switch SW ₁ for turning on or off the discharge circuit part are configured in series. Inductive kickback voltage cancellation device for phase off control. The method of claim 4, wherein the voltage supply unit, Phase off, characterized in that the voltage supply resistor R ₂ for forming a predetermined voltage V _ac2 at both ends according to the principle of voltage distribution and the AC two-way switch SW ₂ for turning on or off the voltage supply is configured in series Inductive kickback voltage canceller for control. The method of claim 4, wherein And a zero crossing detector configured to detect zero-crossing of the AC voltage signal. The method of claim 8, wherein the control unit, The AC bidirectional switch SW ₀ is switched on when a predetermined time has elapsed after the zero crossing detected by the zero crossing detection unit is switched from (−) to (+), and when the next zero crossing is detected, the AC bidirectional switch SW ₀ is turned on. And inductive kickback voltage cancellation device for phase off control, characterized in that it is configured to switch off to perform phase off control. The method of claim 9, wherein the control unit, In the phase-off control, the voltage supply is turned on to lower the inductive kickback voltage to a voltage V _ac1 below a predetermined discharge threshold voltage and to turn off the voltage supply when lowered below the discharge threshold voltage. And turn off the discharge circuit portion during the phase-off control and maintain the discharge state by turning off the discharge circuit portion when the next zero crossing is detected.

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