KR101186904B1 - Three Phases Electromagnet Controller - Google Patents

Abstract

The present invention relates to a three-phase full-wave phase-controlled rectifier, and more particularly, to a three-phase electromagnet controller capable of solving the heating and noise problems caused by the amount of change in the magnetic flux inside the electromagnet head by fixing the direction of power in one direction. .

Description

Three Phase Electromagnet Controller

The present invention relates to a three-phase full-wave phase-controlled rectifier, and more particularly, to a three-phase electromagnet controller capable of solving the heating and noise problems caused by the amount of change in the magnetic flux inside the electromagnet head by fixing the direction of power in one direction. .

In general, for the control of the electromagnet, the complete contact point of the strong structure does not require periodic maintenance work, the operation response is fast, and it can cope actively with the change of the load resistance by the maximum current limiting ability and the temperature, Three-phase full-wave phase-controlled rectifiers that can effectively regenerate accumulated energy into an input AC power source are widely used.

1 is an operation signal timing diagram of a conventional three-phase full-wave phase controlled rectifier. FIG. 1A is a timing diagram when the conduction angle α is 30 °, and FIG. 1B is a timing when the conduction angle α is 70 °. 1C is a timing diagram when the conduction angle α is 90 °.

Referring to FIG. 1, when the conduction angle α is 30 °, as shown in FIG. 1A, since the output voltage has a positive value, the power is fixed in one direction, but the conduction angle α is 70 degrees. In the case of ˚ and the conduction angle α of 90 °, as shown in FIGS. 1B and 1C, since the output voltage is repeated with positive and negative values, the power direction is in one direction. Since it is not fixed and changes periodically, there is a big problem in changing the magnetic field applied to the load.

In addition, when the output voltage repeats a positive value and a negative value, the direction of the current is constant but the direction of the voltage is continuously changed, causing excessive heat to the electromagnet.

Therefore, the vortex loss is generated in the iron core of the electromagnet head, and there is a problem in that the electromagnet coil is damaged and the noise problem occurs due to overheating in the head during continuous operation.

It is an object of the present invention to solve the problems as described above is to provide an electromagnet controller that can prevent the damage and noise generation of the electromagnet coil due to overheating by minimizing the magnetic field change by fixing the power direction in one direction have.

In order to achieve the above object, the three-phase electromagnet controller according to the present invention has conductive elements (S1, S3, S5) connected to input terminals of three input power sources and conductive elements (S2, S4) respectively connected to output terminals of three input power sources. And a three-phase rectifier including S6, a timing controller for applying an operation control signal to the SCR of the three-phase rectifier, and an electromagnet coil unit for receiving an AC voltage output through the SCR. The control unit applies an operation signal (first turn-on signal) to each conductive element within one period; An additional operation signal (second turn-on signal) is applied to the conductive element in a section where the line voltage becomes '0'.

Here, the timing controller may control the operation signal from the first conducting element S1 to the sixth conducting element S6 from the portion separated by the conduction angle α from the portion where the initial line voltage in one period becomes '0'. One turn on signal) sequentially or non-sequentially; In the period where the line voltage becomes '0', an additional operation signal (second turn-on signal) is separately applied to the conducting element connected in series with the conducting element to which the first turn-on signal is applied.

When the first turn-on signal is applied to one of the conducting elements S1, S3, and S5 respectively connected to the input terminals of the three input powers, the timing controller performs the remaining conduction in the section where the line voltage becomes '0'. Applying a second turn-on signal to a conductive element connected in series of the elements; When the first turn-on signal is applied to one of the conducting elements S2, S4, and S6 respectively connected to the output terminals of the three input power sources, the line voltage becomes '0' in the section where the line voltage becomes '0', and is connected in series. A second turn-on signal is applied to the conductive element.

In addition, two conduction elements SC 'and SB' connected to the input terminal PM of the electromagnet coil unit and two conduction units connected to the output terminal NM for regenerating power of the electromagnet coil unit in the regenerative mode (OFF mode). A reverse voltage section having elements SC and SB; The timing controller may apply an operation signal to the conductive elements SC ', SB', SC, and SB.

In the regenerative mode (OFF mode), the timing controller is configured to regenerate the power of the electromagnet coil unit by fixing the output voltage of the three-phase rectifier to a negative voltage so that the operation region is located at the four upper limits.

And a reverse voltage unit configured to apply a reverse voltage by forming a single-phase or three-phase structure in which the conductive element is disposed in a reverse direction to the conductive element of the three-phase rectifying unit to remove the remaining components attached to the electromagnet coil unit. .

In addition, the conductive element is characterized in that the thyristor (SCR).

As described above, the three-phase electromagnet controller according to the present invention has an excellent effect of suppressing overheating and noise generation by minimizing the magnetic field change of the magnet head by fixing only one positive voltage to output power in one direction. Occurs.

In addition, since only a positive voltage is used, an excellent effect of improving resolution occurs.

1 is an operation signal timing diagram of a conventional three-phase full-wave phase controlled rectifier. FIG. 1A is a timing diagram when the conduction angle α is 30 °, and FIG. 1B is a timing when the conduction angle α is 70 °. 1C is a timing diagram when the conduction angle α is 90 °.
2 is a circuit diagram schematically showing a three-phase electromagnet controller according to a preferred embodiment of the present invention.
3 shows an operation signal timing diagram when the conduction angle α is 70 ° according to a preferred embodiment of the present invention.
4 illustrates an operation signal timing diagram when the conduction angle α is 90 ° according to a preferred embodiment of the present invention.
5 illustrates simulation results according to the conventional timing control method and the timing control method according to the present invention when the conduction angle is 90 degrees.

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

2 is a circuit diagram schematically showing a three-phase full-wave phase controlled rectifier according to a preferred embodiment of the present invention.

Referring to FIG. 2, the three-phase full-wave phase controlled rectifier according to the present invention includes a three-phase rectifier 10 formed of six conductive elements, a timing controller 30 for applying an operation control signal to the SCR of the three-phase rectifier, and the SCR. It may be configured to include an electromagnet coil unit 20 receives the output AC voltage.

Here, the three-phase rectifier 10 is connected to the three AC input power (A, B, C), respectively, the first conductive element (S1), the third conductive element (S3), the fifth conductive element ( S5) and a second conductive element S2, a fourth conductive element S4, and a sixth conductive element S6 respectively connected to the three AC input power sources A, B, and C to output a voltage. Can be configured.

The first to sixth conductive elements S1, S2, S3, S4, S5, and S6 may be formed of a thyristor (SCR).

The timing controller 30 is responsible for applying an operation control signal to the six conductive elements S1 to S6 of the three-phase rectifier 10.

Hereinafter, a description will be given of the power mode (ON mode) and the regenerative mode (OFF mode). Here, the power mode refers to a state in which electric current flows through the electromagnet, and the regenerative mode refers to a state in which the electric current of the electromagnet is regenerated to regenerate the electric power of the electromagnet into an input AC power source.

<Power mode>

3 shows an operation signal timing diagram when the conduction angle α is 70 ° according to a preferred embodiment of the present invention.

Referring to FIG. 3, when the conduction angle is 70 °, the timing controller 30 may move the first conducting element S1 at a portion that is 70 ° away from a portion where the initial line voltage becomes '0' (a portion where the phase voltage crosses). ) Is applied to the sixth conductive element S6 sequentially or non-sequentially.

Here, in the conventional timing control method, an amplitude having a constant magnitude is repeated, and since a lower end of the amplitude passes through a section of '0' or less, a negative voltage section is generated in which an output voltage is smaller than '0'. .

Accordingly, the timing controller 30 according to the present invention is characterized by outputting an operation control signal for removing that a negative voltage section in which the output voltage is smaller than '0' occurs.

That is, the timing controller 30 separately applies an operation signal (first turn-on signal) to the sixth conductive element S6 from the first conductive element S1 to the sixth conductive element S6. By applying an additional operation signal (second turn-on signal) at the part where the phase voltage crosses, switch to another switch and freewheeling at the part where the output voltage becomes smaller than '0' to turn the voltage to '0'. Keep it. Therefore, the power direction can be fixed in one direction.

Here, in the first operation, the first conductive element S1, the second conductive element S2, the third conductive element S3, the fourth conductive element S4, the fifth conductive element S5, and the sixth conductive element The operation signal (first turn-on signal) is simultaneously applied to S6 in pairs, but in the case of the thyristor SCR, when the operation signal is applied once and the current is maintained to flow, the turn-on state can be maintained even if the gate signal is turned off. Therefore, in the case of the power mode as shown in FIG. 3, an operation signal (first turn-on signal) may be sequentially applied from the first conductive element S1 to the sixth conductive element S6 within one period.

In addition, in the present embodiment, an additional operation signal (second turn-on signal) is performed at a portion where the line voltage becomes '0' after the operation signal (first turn-on signal) of the first conductive element S1 is applied within one period. ) Is applied sequentially from the third conductive element (S3) to the first conductive element (S1), it is obvious that it can be applied in a non-sequential manner according to the input voltage.

4 illustrates an operation signal timing diagram when the conduction angle α is 90 ° according to a preferred embodiment of the present invention.

Referring to FIG. 4, when the conduction angle is 90 °, the timing controller 30 may move the first conduction element S1 at a portion that is 90 ° away from the portion where the initial line voltage becomes '0' (the portion where the phase voltage crosses). ) Is sequentially applied to the sixth conductive element S6.

Even when the conduction angle is 90 °, similar to the case where the conduction angle of FIG. 3 is 70 °, there is a section in which the output voltage is smaller than '0', so the line voltage becomes '0' (the part where the phase voltage crosses). By applying an additional operation signal (second turn-on signal) in the output voltage is less than '0' to switch to another switch to freewheeling (Freewheeling) can be maintained at a voltage of '0'.

Description of the rest of the operation is the same as the case where the conduction angle is 70 ° will not be described in detail.

On the other hand, in the section where the conduction angle is 120 ° or more, since the output voltage always exists in a negative state, the output voltage always becomes '0' during timing control according to the present invention.

That is, the electric power is fixed in one direction using only the output voltage of the section where the conduction angle is 120 ° or less and the output voltage is positive or only the positive and negative states exist simultaneously. This can improve the resolution.

<Regeneration mode>

In order to subtract the current flowing through the electromagnet in the regenerative mode, the voltage output through the three-phase rectifier 10 must be a negative voltage so that the operating region is positioned at the upper limit of four to regenerate the electromagnet power to the input AC power source.

To this end, in the regenerative mode, the timing controller 30 may control the output voltage to become a negative voltage when only the first turn-on signal is applied to the first to sixth conductive elements S1 to S6. Can be.

In this case, when the conduction angle is small as shown in FIG. 1A, the output voltage may be output with a positive voltage. When the conduction angle is 90 degrees as shown in FIG. 1C, since the average output voltage is “0”, the conduction angle is greater than 90 degrees. Can be controlled to output a negative voltage on average.

Meanwhile, the electromagnet may further include a reverse voltage unit 40 for removing a polar component remaining in the electromagnet in a state in which the electromagnet is close to 0 in the regenerative mode by the operation algorithm as described above.

The reverse voltage unit 40 may be composed of four conductive elements configured in a single phase, and the seventh conductive element SC ′ and the eighth conductive element SB ′ branched from the input terminal PM of the electromagnet coil unit 20. ) And the ninth conductive element SB and the tenth conductive element SC branched from the output terminal NM of the electromagnet coil unit 20.

The conduction element of the reverse voltage unit 40 may be disposed in a reverse direction to the conduction element of the three-phase rectifier. When the conduction element of the reverse voltage unit 40 is operated through this, a negative voltage may be momentarily applied to the electromagnet. The change in polarity removes residual components such as iron attached to the electromagnet.

Since the remaining components attached to the electromagnet as described above may promote deterioration of the electromagnet, it is preferable to remove them through the reverse voltage unit as described above.

In the present embodiment, only the case where the reverse voltage mode is temporarily used and the capacity is small, and only the case of a single phase is shown, it is obvious that it can be composed of three phases.

5 illustrates simulation results according to the conventional timing control method and the timing control method according to the present invention when the conduction angle is 90 degrees.

Referring to FIG. 5, in the conventional timing control method, as shown in FIG. 5A, a negative voltage having an output voltage less than '0' is outputted, and thus, power is difficult to maintain in one direction. Although it can not but occur, the timing control method according to the present invention can not only eliminate the heating problem and noise problem, but also improves the resolution, as the output voltage can be maintained at a positive state at all times as shown in FIG. 5B. The excellent effect that occurs.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10: three phase rectifier 20: timing controller
30: electromagnet coil portion 40: reverse voltage portion

Claims (6)

Operation of the three-phase rectifier and the SCR of the three-phase rectifier including the conductive elements (S1, S3, S5) connected to the input terminals of the three input power sources, and the conductive elements (S2, S4, S6) respectively connected to the output terminals of the three input power sources. An electromagnet control apparatus including a timing controller for applying a control signal and an electromagnet coil unit receiving an AC voltage output through the SCR.
The timing control unit
The operation signal (first turn-on signal) is sequentially sequenced from the first conducting element S1 to the sixth conducting element S6 from the portion separated by the conduction angle α from the portion where the initial line voltage in one period becomes '0'. Or applied sequentially;
In a period in which the line voltage becomes '0', an additional operation signal (second turn-on signal) is separately applied to the conducting element connected in series with the conducting element to which the first turn-on signal is applied, thereby controlling to output only a positive voltage. Three-phase electromagnet controller.
delete The method of claim 1,
The timing control unit
When the first turn-on signal is applied to one of the conducting elements S1, S3, and S5 respectively connected to the input terminals of three input power sources, the line voltage is '0' in a section where the line voltage becomes '0', and is connected in series. Applying a second turn on signal to the conductive element;
When the first turn-on signal is applied to one of the conducting elements S2, S4, and S6 respectively connected to the output terminals of the three input power sources, the line voltage becomes '0' in the section where the line voltage becomes '0', and is connected in series. And a second turn-on signal to the conductive element to control only the positive voltage to be output.
The method of claim 1,
In regenerative mode (OFF mode)
And the timing control unit regenerates the power of the electromagnet coil unit by fixing the output voltage of the three-phase rectifying unit to a negative voltage so that the operation region is located at the four upper limits.
The method of claim 4, wherein
The three-phase electromagnet further comprises a reverse voltage unit formed of a single-phase or three-phase structure in which the conductive element is disposed in a reverse direction with the conductive element of the three-phase rectifying unit to remove components remaining in the electromagnet coil part, and applying a reverse voltage. Controller.
delete

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