JP2747749B2 - Gate pulse transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate pulse transmission system, and more particularly to a power conversion device using a thyristor.
The present invention relates to a gate pulse transmission method for transmitting a pulse from a gate pulse generator to a pulse amplifier.

[0002]

2. Description of the Related Art In the transmission of a conventional gate pulse,
One thyristor requires a pair of signal lines, and a system having a large number of thyristors, such as a cycloconverter, has a problem that the number of signal lines increases and the cost and the man-hour increase. For example, since the transmission between the gate pulse generator and the pulse amplifier uses a pair of signal cables for a one-phase thyristor, six pairs of signal lines are required for one three-phase full-wave rectifier circuit. In large capacity systems,
Since the main circuit voltage is high and the pulse voltage is increased by a pulse amplifier and a pulse transformer to increase noise immunity, transmission is performed. Therefore, there are problems such as an increase in the number of boards and an increase in cost. In addition, when the signal line becomes long, there is a problem that the wiring method must be considered so as not to be affected by crosstalk between signals. To solve this problem, electricity is converted to light and light is converted to light. However, in the case of a one-to-one interface, the number of optical cables is large, so that there is a problem in that it is difficult to adopt it in terms of cost.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the number of wirings and to improve the reliability of gate pulse transmission in view of the above circumstances.

[0004]

In order to achieve the above object, a gate pulse generator detects a rising edge of a polyphase wide gate pulse to generate a narrow pulse, and generates a gate pulse for each phase. A serial conversion circuit for converting into a single pulse train and a reference data generating circuit for generating reference data immediately after generation of a pulse serving as a reference of the pulse train are provided, and the pulse train and the reference data are transmitted as one signal. In the pulse amplifier on the receiving side, the reference data is detected from the transmitted signal by a decoding circuit, the relationship between the rising timing and the phase of the pulse train is decoded, and the pulse train is distributed to multi-phase pulses.

[0005]

[Function] The serial conversion circuit in the gate pulse generator is
The multi-phase pulse signal is converted into one pulse train. However, it is not possible to determine which phase the pulse is based on a simple pulse train. Therefore, in order to distinguish the phase of the next pulse in the pulse train, the reference of the pulse train is created by the reference data generation circuit. The pulse amplifier on the receiving side detects the reference signal in the transmission data, knows that the next pulse is the reference pulse, and can distribute the pulse based on the rising edge of the pulse train. In the case of a gate pulse, the phase order of the remaining five phases can be known if one phase is known, so that distribution is possible.

[0006]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 1 is a three-phase AC power supply, 2 is a thyristor converter composed of six thyristors, 3 is a load, 4 is a thyristor gate circuit, 5 is a pulse amplifier, and 6 is a gate pulse generator. The pulse amplifier 5 and the gate pulse generator 6 are connected by one signal line. The gate of each thyristor has a gate pulse U as shown in the figure.
_{P, U N, V P,} V N, W P, W N is applied.

The details of the pulse amplifier 5 and the gate pulse generator 6 will be described with reference to FIG. The gate pulse generator 6
A gate pulse generation circuit 61 for controlling the phase of an output pulse in accordance with a control input; a serial conversion circuit 62 for converting a six-phase pulse into one pulse train; a reference data generation circuit for generating a reference pulse timing among the six-phase pulses 63, a serial conversion circuit 62 and a transmission circuit 64 for transmitting the output of the reference data generation circuit 63 as one signal. The pulse amplifier 5 includes a gate pulse generator 6
, A reference circuit is detected from a signal in the pulse train, a decode circuit 51 for generating a pulse reference timing, a pulse edge detection circuit 52 for detecting a pulse switching timing from the rising edge of the pulse train, and
A decoding circuit 51 and a distribution circuit 53 that distributes the pulses into six phases based on the output of the pulse edge detection circuit 52,
It is configured. Generally, the gate pulse generator 6 is mounted on the same panel as the control device, and the pulse amplifier 5 is mounted on the same panel as the thyristor converter.

A pulse transmission system between the gate pulse generator and the pulse amplifier shown in FIG. 2 will be described with reference to FIGS. Gate pulse U _P output from the gate pulse generator _{61, U N, V P,} V N, W P, W N are input to the serial converter circuit 62 detects the rising edge of the phase pulses, FIG. 3 pulse train as shown in the six-phase pulse U _P, W _{N,
V P, U N, W P} , is converted to V _N. Reference data generating circuit 63, as shown in FIG. 3, after the output of the V _N-phase pulses, 1
Generate byte reference data. The reference data (enlarged) is an enlarged view of the reference data indicating 1-byte START and END. The reference data may be any signal that can be distinguished from the signal of the gate pulse train. Transmission circuit 64
Takes the logical OR of the 6-phase pulse train of FIG. 3 and the reference data,
The output is as shown in the transmission circuit output of FIG.

The pulse amplifier 5 receives the signal from the transmission circuit 64, detects the timing at which the reference data is transmitted from the pulse train by the decoding circuit 51, and sets the reference timing signal as shown in FIG. And
It is determined that the pulse of the next pulse train is a _UP- phase pulse. On the other hand, the timing is detected by the pulse edge detection circuit 52 at each rising edge of the pulse train, and the distribution circuit 53
The 6-phase pulse _{U P, U N, V P} , V N, W P, partitioned W _N. Incidentally, the reference data so as to occur immediately after the output of the V _N-phase pulse may be generated immediately after the output of the other phase pulses. As described above, it is possible to transmit a pulse as a serial signal through one signal line.

FIGS. 5 and 6 show another embodiment of the present invention. FIG gate pulse generator 6 5, the reference pulse generating circuit 65 for taking out the inner U _P phase of the serial converter circuit 62,6 phase pulses to convert the gate pulse generating circuit 61,6 phase pulses into a single pulse train as a reference signal, The serial conversion circuit 62 and the transmission circuits 66 and 67 for transmitting the respective outputs of the reference pulse generation circuit 65 are constituted. The pulse amplifier 5 receives the six-phase pulse trains and the reference pulses transmitted from the transmission circuits 66 and 67, and the receiving circuits 71 and 72, respectively, and distributes the pulse train into six-phase pulses based on the edge signal of the pulse train and the reference pulse. The pulse distribution circuit 73 is configured. The gate pulse transmission method according to this configuration will be described with reference to FIG. The serial conversion circuit 62 in the gate pulse generator 6
_P, detecting a rising edge of the _{U N, V P, V N} , W P, W N,
A six-phase pulse train shown in FIG. 6 is created. The reference pulse generating circuit 65 creates a reference pulse detecting the rising edge of the U _P pulse. Based on the six-phase pulse train and the reference pulse, the pulse distribution circuit 73 in the pulse amplifier 5
It is possible to distribute the phase parallel signals. In addition,
Although the inner U _P phase of six-phase pulse was be taken out as a reference signal, it may be taken out other phases as a reference signal. As described above, it is possible to transmit by one signal line transmitting the six-phase pulse as a serial signal and one signal line transmitting the reference pulse, that is, a total of two lines.

[0011]

According to the present invention, the number of signal lines for the gate pulse generator and the pulse amplifier can be reduced from six to one or two, so that the cost of the system can be reduced. In particular, this is effective when the mounting of the gate pulse generator and the pulse amplifier is a separate board and the transmission distance between the two is long. Further, since the number of signal lines can be reduced, even if an expensive optical cable is employed, the cost is not significantly increased, and this is effective. Also, by converting the wide-phase gate pulses applied to the power converter in a prescribed order into a narrow pulse train and transmitting them as serial signals, it is possible to improve noise immunity during transmission, and at the same time, Since the pulse train can be demodulated only by adding reference data for determining a reference pulse to one pulse train, the system can be simplified. Also, since the pulse train and the reference data have the same size, in an optical transmission system in which the signal must be transmitted with the same size,
Without erroneous transmission, malfunction of the system can be prevented, and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a thyristor conversion circuit and a gate pulse generator.

FIG. 2 shows an embodiment of the present invention.

FIG. 3 is a diagram illustrating timing of gate pulse transmission.

FIG. 4 is a diagram illustrating the timing of gate pulse reception.

FIG. 5 shows another embodiment of the present invention.

FIG. 6 is a view for explaining the operation timing of FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 three-phase AC power supply 2 thyristor converter 3 load 4 gate circuit 5 pulse amplifier 6 gate pulse generator 51 decoding circuit 52 pulse edge detection circuit 53 distribution circuit 61 gate pulse generation circuit 62 serial conversion circuit 63 reference data generation circuit 64 transmission circuit 65 Reference timing creation circuit 66, 67 Transmission circuit 71, 72 Receiving circuit 73 Distribution circuit

Claims (1)

(57) [Claims] 1. A power converter for converting to multi-phase power,
The wide phase resistors applied in the specified order to the power converter
A narrow pulse by detecting the rising edge of the
While raw, and the serial conversion circuit for converting the phase gate pulses to one pulse train, a reference of said pulse train
A gate pulse generator including a reference data generation circuit that generates reference data immediately after the generation of a pulse, and a transmission circuit that transmits a signal as one serial signal by the output of the serial conversion circuit and the reference data generation circuit; A decoding circuit that receives an output of the gate pulse generator and determines a reference pulse of the pulse train from the reference data; a pulse edge detection circuit that detects a rising edge of the pulse train; the decoding circuit and the pulse edge detection circuit And a distributing circuit for distributing the multi-phase pulse from the output of the gate pulse.