JPS5928443Y2 - Rectifier circuit waveform explanation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rectifier circuit waveform explanation device that displays the output waveform of a three-phase mixed bridge rectifier circuit, particularly the output voltage waveform and reverse voltage waveform of a three-phase mixed bridge rectifier circuit that performs phase control.

Figure 1 shows thyristor T□1T21T3 and diode D.
When the phase of the thyristor of this rectifier circuit is controlled in a mixed bridge rectifier circuit of I + D2 + D 3, the output waveform of the rectifier circuit changes variously depending on the phase control angle. It takes a long time to understand or explain, and it is not easy to understand or explain.Also, it is easy to understand and explain when actually displaying it using an oscilloscope, but when it comes to rectifier circuits built into equipment, If the device is not operated, the output waveform cannot be displayed, which has the disadvantage of being impractical.

The purpose of this invention is to eliminate the drawbacks of the conventional slanted board, and to combine two mounts through notches and slide them depending on the size of the phase control angle to control the output voltage waveform and rectifier element. It is an object of the present invention to provide a waveform explanation device for a rectifier circuit that displays the waveform of the reverse voltage Ep of applied line-to-line Ea.

The waveform explanation device of the present invention will be explained in detail below with reference to the drawings.

Figure 2 a and b are the waveforms drawn on the first mount;
The waveform shown in FIG. 1 is the waveform portion of the output voltage Ed when the thyristors T1 to T3 in FIG. 1 are not controlled, that is, during natural commutation of the rectifier circuit. colored with the color of

In addition, each waveform constituting this output voltage waveform section has a notch formed along the waveform from a position of 600 to 1200 as shown by a thick line passing through the origin, respectively.
Furthermore, this waveform W, including the first white waveform W1 passing through the origin
Phase control angle 1200 to 180° for each second wave from 1
A notch is formed along the sinusoidal waveform up to

Figure 2 shows the anode-cathode voltage Ep (arm reverse voltage waveform part) applied to the thyristor shown in Figure 1, which is drawn opposite to the output voltage waveform part, and this reverse voltage waveform part is located at the origin. , and a second waveform W3 which is 600 phases ahead of the first waveform.The negative portions of the waveforms are colored with an arbitrary color as shown by the diagonal lines.

In addition, in the negative part of each waveform of this reverse voltage waveform part, a notch is formed along the waveform as shown by the thick line, and
The positive part of the second waveform W3 forms a cut along the waveform up to 900 degrees from the origin, and the positive part of the first waveform W2 forms a cut along the waveform up to a position of 1500 degrees from the origin, and furthermore, the first waveform W2 A notch is formed along the center line up to 60° from the origin.

Furthermore, phase control angle scales such as α=30°, 600, 900, 120°, and 150° are provided near the output voltage waveform portion.

Figure 3 a and b are notches formed in the second mount, and the notch in Figure 3 a is for inserting a part of the output voltage waveform section formed by cutting into the first mount. , that is, the waveform when the phase control angle α is 150' at the maximum is the first
In order to display it on the mount of
．． 2 (the same applies hereinafter) is provided with a notch in the vertical direction that is at least greater than the amplitude of the output voltage waveform portion of the first mount,
Furthermore, along the center line, provide an interval of 30° from the previous vertical cut (in the general formula, it is [30 (4n + 1))], which may be 0 [1
20° (3n+1)] to 0).

Therefore, this cut is formed in a "" shape.

The notch shown in FIG. 3 is formed so that a part of the reverse voltage waveform portion drawn on the first mount is inserted.

That is, in order to display on the first mount the waveform when the phase control angle α of the reverse voltage waveform portion of the first mount is 150° at the maximum, the reverse voltage waveform portion of the first mount is colored. 5 (360n)b positive part, [120(3
n+1)]0 negative part and [120(3n+2))0
Incisions are formed in the vertical force direction at the positive and negative portions, respectively, with a length equal to or longer than the amplitude of the reverse voltage waveform portion of the first mount.

Further, along the center line, cuts are formed at positions 2100 behind the cuts made only in the respective members.

Also, along the center line, from [90(4n-1))0 to [1
20(3n+1)] Color the positive part up to 0 with an arbitrary color.

A waveform display when the phase of the rectifier circuit is controlled by overlapping the first mount and the second mount configured as described above will be described.

Although the explanation device of the present invention displays the output voltage waveform of the rectifier circuit and the reverse voltage waveform of the arm at the same time, for convenience, the output voltage waveform will be explained first.

Figure 4a shows the output voltage waveform when the three-phase mixed bridge rectifier circuit is phase controlled, with phase control angle α = 30°, 600°
, 900°, 120°, and 150°, respectively.

When displaying the output voltage waveform at such a phase control angle, for example α-150°, using a waveform explanation device, superimpose the first mount on the second mount and use the C-C' line in Figure 3a. 1. At each cut point. When inserting the notched waveform in Figure 2a and aligning the c-c' line with the α-1500 line of the phase control angle, as shown at α-1500 in Figure 5a, A hatched (colored portion) waveform appears, and this waveform is the same as the waveform at α2150° in FIG. 4a.

Similarly, this first. In order to display the output waveforms when the phase control angle α is 300, 600.90°, and 120° using the second mount, the first mount, that is, the phase control angle α in the diagram of FIG.
=300.If the lines of 60°, 90°, and 1200 are aligned while sliding through the notches, the fifth
As shown in figure a, the shaded waveform α=30°, 600°.
90 degrees and 1200 degrees can be displayed.

This is exactly the same as the DC output voltage waveform shown in FIG. 5a.

Next, we will discuss the display of the reverse voltage waveform when phase control is performed using a three-phase mixed bridge rectifier circuit.

Figure 4 shows the arm reverse voltage waveform when phase-controlled a three-phase mixed bridge rectifier circuit, with phase control angles α30° and 60'.
, 90°, 120°, and 1500°, respectively.

When displaying the arm reverse voltage waveform at such a phase control angle, for example 1500, on a waveform explanation device, superimpose the first mount on the second mount and cut the line D-D' in Figure 3. At this point, the positive part of the second waveform W2 in Figure 2 is shown.
Moreover, the negative part of this waveform W2 is located in the notch of line FF' in FIG.
- Insert each into the notches of E' and slide the line D.
-D' position is α=15 of the phase control angle scale of the first line
When set to the 00 position, a hatched waveform appears as shown at α=150° in FIG. 5, and this waveform is the same as the waveform at α150° already blanked out in FIG.

Similarly, scales of the phase control angle α of the first mount are placed at the cut points along the line D-D' in FIG. 3: 300.60°, 900°12
When the 0° lines are aligned while sliding, a hatched waveform appears as shown in FIG. 5, and the reverse voltage waveform and opposite waveform of FIG. 4 can be displayed, respectively.

In addition, although the colored part display in the above explanation was explained as a positive or negative part in each case, the colored part used in the actual display is the part described below, and the There is no problem even if you only color some parts.

In other words, the output voltage waveform portion (second
In Figure a), the positive part surrounded by the center line and the waveform is colored, and the reverse voltage waveform part (Figure 2b) is C120 (3n+1
)] maybe 0 (360(n+1)) The center line up to 0, the negative part surrounded by the waveform, and C on the second mount (Figure 3 b)
30 (12n+5):]0 to [360(n+1)
):] The positive portions surrounded by the center line up to 0 and the portion above the amplitude of the first mount may be colored respectively.

As explained above, the rectifier circuit waveform explanation device of the present invention has a first waveform explanation device according to the size of the phase control angle a. The output waveform can be displayed simply by combining the 20th mounts through their respective notches and sliding them against each other, making it easy to handle and clearly explain the output voltage waveform and arm reverse voltage waveform that vary depending on the phase control angle. This is particularly effective in explaining thyristor applied products using phase control circuits or in explaining technical circuits to beginners or users.

Also, while measuring the output waveform of a product during product testing or other operation of a rectifier circuit incorporated in a device with a measuring instrument such as an oscilloscope, the display on the measuring instrument and the display on the rectifier circuit waveform explanation device of the present invention can be compared. By comparing the information, you can also check the operating status.

[Brief explanation of drawings]

Figure 1 is a wiring diagram of a three-phase mixed bridge rectifier circuit for explanation, Figure 2 is the first mount, a is a waveform for displaying the output voltage waveform, b is a waveform for displaying the reverse voltage waveform applied to the arm, Third
The figure shows the second mount, α is the notch for displaying the output voltage waveform, b is the notch for displaying the reverse voltage waveform applied to the arm, Figure 4 is the waveform diagram during phase control, and a is the output voltage In the waveform diagram, b is a reverse voltage waveform diagram applied to the arm, FIG. 5 is a waveform displayed by combining the first mount and the second mount, a is an output voltage waveform diagram, and b is a reverse voltage waveform diagram applied to the arm. FIG. 3 is a reverse voltage waveform diagram. T and -'ra are thyristors, and D1 to D3 are diodes.

Claims (1)

[Claims for Utility Model Registration] The output voltage waveform portion of the three-phase mixed bridge rectifier circuit during natural commutation is colored, and each colored waveform is 600 degrees from the origin.
It includes the first white waveform that passes through the origin from the position of 2100 to 2100, and every second wave is 120°
forming a notch along the sinusoidal waveform up to 180°, and providing a colored reverse voltage waveform portion between the lines that is arranged opposite to this output voltage waveform portion and is applied to the rectifying element of the rectifier circuit; The negative parts of this reverse voltage waveform part are cut along the sine wave, and the positive part of the first waveform passing through the origin has a sine wave up to 1500 from the origin and a sine wave up to 600 from the origin, respectively, and the center line. 6 from this first waveform.
900 from the origin to the positive part of the second waveform with 00 phase advance
A first mount with cuts up to 100 mm and further marked with a phase control angle scale, and cuts formed at intervals of 1200 to insert the waveform formed by cutting into the voltage waveform portion of the rectifying circuit. and (360n) 0 (however, n-±0, 1, 2-.-
), the negative part of [120(3n+1)]0, and the positive and negative parts of [120(3n+2)]0 are provided with cuts in the vertical force direction, and along the center line, the above C120(
3n+1)] a second mount in which cuts are formed at positions 120° behind the negative part of 0, and
1. A waveform explanation device for a rectifier circuit, characterized in that a waveform portion formed by cutting a first mount is inserted into a notch of the mount and slidably assembled.