JPS5854760B2 - gate circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gate circuit 1 of a circulating current type reversible Leonard device using Cyrisk.

Fig. 1 shows an example of the main circuit of a conventional circulating current type three-phase half-wave reversible Leonard device, where 1 is a star-connected main circuit power transformer, and 2 is a positive polarity switch of a DC motor 5 during forward rotation. A three-phase half-wave AC-DC converter that supplies voltage, 3 a three-phase half-wave AC-DC converter that regenerates power from the DC motor 5 to the power source during normal rotation regenerative operation of the DC motor 5, and 4 a circulation converter. This is a reactor for current suppression.

In the circulating current type three-phase half-wave reversible Leonard device,
In order to eliminate a dead zone when switching the polarity of the current flowing through the DC motor 5, the circuit is constructed so that a circulating current of several percent of the rated current is always passed through the AC-DC converter 2. .3, it is necessary to always supply a trigger pulse.

In this device, conventionally, in order to obtain a firing angle corresponding to one gate input signal, a total of six gate circuit configurations, three sets each, were required for the AC-DC converter 2.3.

Figure 2 is a circuit diagram showing an example of the configuration of a conventional gate circuit;
The figure is an operational characteristic diagram of FIG. 2.

In Fig. 2, 6 is the sirisk R of the AC-DC converter 2.
A gate circuit that supplies trigger pulses to P, SP, and TP;
7 is the thyristor RN, SN, TN of the AC-DC converter 3
The gate circuits 6 and 7 have the same circuit configuration.

101 to 103 are thyristors RP of the AC-DC converter 2
, SP, TP sine wave power supply synchronization signal, 104-106
are the single-term signals of the sine wave power supplies of the thyristors RN, SN, and TN of the AC-DC converter 3, and 111 to 116 are the thyristors R.
P.

Output signals that provide trigger pulses to the respective gates of SP, TP, RN, SN, and TN are shown.

11 is a rectifier circuit that converts the synchronizing signal 101 into a half-wave rectangular wave; 12 is a sawtooth wave generating circuit; 13 is a comparator; 14
is a pulse amplification circuit.

In the gate circuit 6, when the synchronizing signal 101 shown in FIG. 3a of the thyristor RP is applied to the input 1 of the rectifier circuit 11, a rectangular wave is output when the voltage exceeds a certain positive polarity, and the output signal 201 is as shown in FIG. As shown below.

When this output signal 201 is applied to the input of the generating circuit 12, the output signal 202 becomes a sawtooth wave as shown by the solid line in FIG. 3C.

When the comparator 13 receives the output signal 202 at the inverting input terminal (Y) and the gate input signal 107 for controlling the AC-DC converter 2 at the non-inverting input terminal (S), the output signal 202 is output as shown by the dashed line in FIG. 3C. When the voltage level of the gate input signal 107 as shown is higher than the waveform of the output signal 202, a positive signal is output, and the output signal 203 becomes as shown in FIG. 3d.

The output signal 203 is converted by the pulse amplification circuit 14 into a narrow width pulse as shown in FIG. 3e, and the pulse amplification circuit 14 converts the output signal 111 into a narrow pulse as shown in FIG.

The gate circuit 6 is also a circuit that supplies trigger pulses to the other Cyrisks SP and TP, and the output signal 112 supplies a trigger pulse to the Cyrisk SP and the output signal 113 supplies a trigger pulse to the Cyrisk TP.

For example, when supplying a trigger pulse to the thyristor RN of the AC-DC converter 3 in the gate circuit 7, the gate input signal 108 differs from the gate input signal 107 of the thyristor RP of the AC-DC converter 2, and furthermore, the phase of the synchronous power supply Since they differ by 180 degrees, a separate rectifier circuit and a sawtooth wave generation circuit are required, and the same applies to other SIRISKS SN and TN.

Therefore, the gate circuits 6 and 7 require a total of six circuits for generating the trigger pulse as described above, and have a large number of components.
Moreover, thyristors RP, SP, and TP.

In order to eliminate variations in the firing angles of RN, SN, and TN, there was a drawback that it took a lot of time to adjust the individual sawtooth wave generation circuits.The present invention aims to eliminate the above-mentioned drawbacks. This is an attempt to reduce the number of parts and adjustment points and provide a highly reliable gate circuit.

The present invention will be explained below based on the drawings.

FIG. 4 is a circuit diagram showing an embodiment of the present invention when applied to a circulating current type three-phase half-wave reversible Leonard device, where the same reference numerals as in FIG. 2 indicate the same components.

FIG. 5 shows the operating characteristics of FIG. 4.

In FIG. 4, reference numerals 8, 9, and 10 are gate circuits, and gate circuit 8 is a gate circuit that supplies trigger pulses to thyristor RP of AC-DC converter 2 and thyristor RN of AC-DC converter 3. The gate circuit 9 is connected to the thyristors SP and SN, and the gate circuit 10 is connected to the thyristors TP and T.
Supply a trigger pulse to N.

11, 11' are rectifier circuits, 21 is an OR circuit, 22 is a sawtooth wave generation circuit, 13°13' is a comparator, 23, 2
3' is an AND circuit, and 14°14' is a pulse amplification circuit.

In the gate circuit 8, the synchronization signals 101 and 104 whose power supply phases of the thyristors RP and RN are different by 1800 degrees are the fifth
Rectifier circuits 11 and 1 with the waveforms shown in figures a and a', respectively.
1', and its output signals 211 and 212 become rectangular waves with a 180° phase difference, as shown in FIGS. 5b and 5b'l.

Therefore, when the output signals 211 and 212 are input to the OR circuit 21, the output signal 213 is converted into a full waveform as shown in FIG. 5C.

When this output signal 213 is applied to the input of the generating circuit 22, the output signal 214 becomes a sawtooth wave as shown by the solid line in FIG. 5d.

The comparators 13 and 13' have inverting input terminals (Y) connected to the output signal 214, respectively, and a non-inverting input terminal 1 of the comparator 13.
-) is connected to the gate input signal 107 that controls the AC-DC converter 2, and the non-inverting input terminal -ff+) of the comparator 13' is connected to the gate input signal 108 that controls the AC-DC converter 3. Therefore, if the voltage level G of the gate input signal 107 and the voltage level σ of the gate input signal 108 are shown by the dashed-dotted line in FIG. The signal 216 is shown as FIG. 5e and e', respectively, at voltage levels G,
A pulse waveform suitable for G' is obtained.

When this output signal 215 and the output signal 211 of the rectifier circuit 11 are applied to the input of the AND circuit 23, the output signal 217 has a phase corresponding to the gate input signal 107 with respect to the synchronization signal 101, as shown in FIG. A pulse waveform with a sharp shape can be obtained.

Similarly, when the output signal 216 and the output signal 212 of the rectifier circuit 11' are applied to the input of the AND circuit 23', the output signal 218 becomes the gate input signal 10 with respect to the synchronization signal 104.
It is possible to obtain a pulse waveform f' in FIG. 5 having a phase corresponding to 8.

The output signals 217 and 218 having such pulse waveforms are converted to the output signals 111 and 218 by the pulse amplification circuits 14 and 14'.
114 is converted into a narrow pulse as shown in FIG. 5gtg' and is amplified and isolated, and the output signal 111 is supplied to the gate of thyristor RP, and the output signal 114 is supplied to the gate of thyristor RN.

Such a gate circuit 8 has a sawtooth wave generating circuit 22 in common, and it is effective to have a total of three generating circuit configurations in the gate circuits 8, 9 and 10, and the adjustment of the three sets of generating circuits is as follows. Adjusting the other two sets of circuits to one set of circuit characteristics is more effective and has the advantage that the number of adjustment points can be reduced to one-third, making it easier.

As described above, according to the present invention, by adding a few logic circuit elements, the phase of the synchronous power supply can be different by 180 degrees,
Moreover, torga pulses can be obtained by using a common sawtooth wave generating circuit in response to different gate input signals, and reliability can be improved by reducing the number of parts and adjustment points.

Although the present invention describes a circulating current type three-phase half-wave reversible Leonard device, the same applies to circulating current type devices such as three-phase full-wave, single-phase full-waveform, and single-phase half-waveform as well as three-phase half-waveform. It goes without saying that the present invention is applicable.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of the main circuit of a circulating current type three-phase half-wave reversible Leonard device, Figure 2 is a diagram showing an example of the gate circuit used in Figure 1, and Figure 3 is an operating characteristic diagram of Figure 2. , FIG. 4 is a circuit diagram showing an embodiment of the present invention when applied to a circulating current type three-phase half-wave reversible Leonard device, and FIG. 5 is an operating characteristic diagram of FIG. 4. 6.7, 8, 9, 10...--gate circuit, 11°11'... rectifier circuit, 12, 22...
Generation circuit, 13, 13'...Comparison circuit, 14
, 14'... Pulse width increase interval, 21...-
...OR circuit, 23,23'...AND AND circuit, 101-106...Synchronization signal, 107.10
8...Gate input signal.

Claims (1)

[Claims] 1 In the gate circuit that generates the trigger pulse of the circulating current type reversible Leonard device using Cyrisk, each rectifier circuit converts the sine wave power synchronization signal of the power line and regenerative Cyrisk into a rectangular wave, and the output signal of the rectifier circuit is An OR circuit as an input, a sawtooth wave generation circuit that takes the output signal of the OR circuit as an input, and an output signal of the sawtooth wave generation circuit as one input, and a gate manual signal for row and regeneration as the other input. two sets of comparators, two sets of AND circuits each having the output signal of the comparator as an input and the output signal of the rectifier circuit as the other input, and two sets of AND circuits that generate a trigger pulse by the output signal of the AND circuit. 1. A gate circuit comprising: a pulse amplifying circuit, wherein a trigger pulse is obtained in response to one of the gate input signals.