JPH0446591A - pulse phase shifter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

The present invention outputs pulses such as ignition pulses for phase control B of Cyrisk, which opens and closes AC power supplies whose frequency can fluctuate, as pulses with a phase corresponding to a given DC level phase control command (also referred to as α command). The present invention relates to a pulse phase shifting device. Note that in the following figures, the same reference numerals indicate the same or corresponding parts.

[Conventional technology]

FIG. 4 is a block circuit diagram showing an example of the configuration of a conventional pulse phase device, and this figure shows an example in which an ignition pulse is applied to a thyristor rectifier for an excitation power source of a synchronous machine. Further, FIG. 6 is a waveform diagram showing the operation of the main part of FIG. 4. In Fig. 4, 11 is a synchronous machine, and 20 is a permanent magnet generator (also abbreviated as PMG) that rotates coaxially with this synchronous machine 11.
(or speed generator), 7 is the main circuit power supply of this synchronous machine, 8
5 is a sirisk rectifier that rectifies the voltage of the main circuit power supply 7, three-phase in this example, to produce a DC voltage 10 for exciting the synchronous machine 11, and 5 is a ignition pulse phase shifter (also abbreviated as FAR). , this phase shifter 5 receives a synchronization signal 9 from the main circuit power supply 7.
and a signal 20a proportional to the rotational speed of the synchronous machine 1 from the permanent magnet generator 20, and a phase control signal 20a from a higher-level device (not shown) as a DC voltage at a level corresponding to the phase angle to control the thyristor rectifier 8. Input command (α command) 1,
A gate pulse 6 having a phase angle specified by the α command 1 is applied to the gate of a thyristor (not shown) in the thyristor rectifier 8 to cause the thyristor to fire. Note that 2 is a bias voltage adjustment resistor that is added to the α command 1 as necessary, and 3 and 4 are limiters that regulate the maximum and minimum values of the α command 1, respectively. Figure 6 shows the synchronization signal 9 for one phase of the three phases in order from the top.
, when the α command 1 is directly input to the ignition pulse phase shifter 5, the α command 1 and the sawtooth wave ST that intersects with this command 1 (this sawtooth wave ST is generated within the phase shifter 5). ), and the waveforms of gate pulse 6 are shown. The same figure (A) shows the case of the rated frequency, and the same figure (B) shows the case where this frequency is n times, that is, the rotational speed of the synchronous machine 11 is n times the rated speed (however, in this example, it is three times). Each case is shown below. Here, the synchronization signal 9 is a sine wave for the relevant phase of the three-phase main circuit power supply 7, and in the phase shifter 5, the permanent magnet generator 20
A sawtooth wave ST having a slope proportional to the output signal 20a is generated, and this sawtooth wave ST repeats zero reset and start at each zero cross point of the synchronization signal 9. On the other hand, α command 1 is a variable DC voltage that is valid from the O level to a level equal to the amplitude of the sawtooth wave ST, and the phase shifter 5 is operated at a point where this sawtooth wave ST and α command 1 intersect (cut). The phase angle can be varied from 0° to 180° (electrical angle) by outputting the gate pulse 6 at the time when the same level of α command 1 is input, and the frequency of the main circuit power supply 7 It is possible to produce a gate pulse 6 with a constant phase angle regardless of variations (ie, the firing phase follows the frequency fluctuations of the main circuit power supply 7). Further, FIG. 5 is a block diagram showing another example of the configuration of the conventional pulse phase shifter, and the functions of FIG. 5 are the same as those of FIG. 4. However, the ignition pulse phase shifter 5A in FIG. 5 generates a sawtooth wave ST synchronized with the synchronization signal 9, similar to the phase shifter 5 in FIG. 4, and compares this sawtooth wave with the α command to determine the gate pulse. This phase shifter 5A has the function of outputting the sawtooth wave S
A sawtooth wave addition circuit 12 that calculates the average voltage of T, and a frequency setter 1 that sets a predetermined command value for this average voltage value.
4. An automatic frequency correction adjuster 13 that increases the deviation between the command value and the actual value by PI and variably adjusts the amplitude of the sawtooth wave ST so that the command value and the actual value match. There is. Therefore, the amplitude of the sawtooth wave ST is always constant, and the phase shifter 5
Similarly to the phase shifter 5 in FIG. 4, the gate pulse A can generate a gate pulse 6 of a constant phase regardless of fluctuations in the power supply frequency as long as the value of the α command l is constant.

[Problem to be solved by the invention]

However, the method shown in FIG. 4 described in the prior art requires an external voltage generating means proportional to the main circuit power supply frequency, such as a permanent magnet generator (or speed generator) 20.
There were drawbacks that led to increased costs. Similarly, the system shown in FIG. 5 has the disadvantage that the circuit configuration inside the control device is complicated and that adjustment takes time. Therefore, it is an object of the present invention to provide a pulse phase shifter that eliminates the above-mentioned drawbacks.

[Means to solve the problem]

In order to solve the above problems, the device of the present invention provides a pulse phase shifter that generates a pulse with a desired variable phase (such as gate pulse 6) for an AC power source (such as main circuit power supply 7) whose frequency can vary. In the device, means for generating at least a sawtooth wave (ST, etc.) synchronized with the AC power supply, the ramp portion of which waveform having a predetermined slope (by inputting a synchronization signal 9 or the like); (ignition pulse phase shifter 50, etc.) and a DC signal (such as the ignition pulse phase shifter 50) corresponding to the phase of the pulse to be generated (
A means (a combination of an F/V converter 152 and a divider 16, or an F
/V converter 15. a combination of a multiplier 17 and an amplifier 18), and means for generating the pulse when the level of the inversely proportional DC signal matches the level of the ramp portion of the sawtooth wave (ignition pulse phase shifter, etc.). 50, etc.).

【Example】

The present invention will be described in detail below with reference to FIGS. 1 to 3. FIG. 1 is a block circuit diagram showing the configuration of the first embodiment of the present invention and corresponds to FIG. 4, and FIG. 3 is a waveform diagram showing the operation of the main part of FIG. 1 and corresponds to FIG. 6. . In FIG. 1, the permanent magnet generator 20 is omitted compared to FIG.
The level of the V converter 5 and the α command 1 is divided by the output 15a of the F/V converter 15, and the output of the divider is given to the new firing pulse phase shifter 50 as the converted α command αF. A calculator 16 has been newly installed. Here, the new phase shifter 50 generates a sawtooth wave ST that always has the same slope in synchronization with the synchronization signal 9, and as shown in FIG. Part pulse 6 is output at the time when the level of the ramp section matches (intersects with) the level of the ramp section. Next, the operation shown in FIG. 1 will be described with reference to FIG. Figure 2 shows the main circuit power supply 7 at its rated frequency (A
), for example, the output 15a of the F/V converter 15 is at the level 1, and the α command 1 is at the same level as the divider 16.
, that is, input to the phase shifter 50 as the conversion α command αF. Next, as shown in Figure 2 (B), the frequency of the main circuit power supply is
A), the output 15a of the F/V converter 15 becomes level 3, and the input α command 1 from the divider 16
The divider output with a level of 1/3, that is, the conversion α command αF is output to the phase shifter 50, and if the level of the α command 1 is constant, the output from the phase shifter 50 is as follows (A ) is output. Next, FIG. 2 shows the configuration of a second embodiment of the present invention, and the function of this FIG. 2 is the same as that of FIG.
In the figure, the function of the divider 16 in FIG. 1 is realized by an amplifier 18 and a multiplier 17 provided in its negative feedback circuit. That is, the output of the amplifier 18 (this is the conversion α command αF
) is multiplied by the output 15a of the F/V converter, the multiplied value is subtracted from the α command 1, and this subtracted value is amplified by the amplifier 18 to become the converted α command αF. Here, if the amplification rate of the amplifier 18 is sufficiently large, the conversion α command αF will be proportional to the value obtained by dividing the α command 1 by the power supply frequency. In other words, for a constant Bell's α command 1, the level of αF changes in inverse proportion to the power supply frequency, and a gate pulse 6 with a constant phase angle that follows fluctuations in the power supply frequency is obtained.

【Effect of the invention】

According to the present invention, in a pulse phase shifter that generates a gate pulse 6 of a desired variable phase for main circuit type #7 as an AC power source whose frequency can vary, by inputting a synchronizing signal 9, at least the above An ignition pulse phase shifter 50 that generates a sawtooth wave ST which is a sawtooth wave synchronized with the main circuit power supply 7 and whose ramp portion has a predetermined slope, and the phase of the gate pulse 6 to be generated. Converting the level of α command 1 as a DC signal corresponding to α to a level inversely proportional to the frequency of the AC power supply α command α
F/V converter 15° divider 1 as a means of converting to F
6 combination, or F/V converter 15, multiplier 17,
The ignition pulse phase shifter 50 generates the pulse when the level of the inversely proportional conversion α command αF matches the level of the ramp portion of the sawtooth wave ST. As a result, the pulse phase shifter of the present invention eliminates the need for external mounting parts, which were problems with conventional systems, and also eliminates the need for adjustment functions, and is configured only by the calculation function inside the control device. Time spent on adjustments is reduced.

[Brief explanation of drawings]

1 and 2 are block circuit diagrams showing the configurations of different embodiments of the present invention, FIG. 3 is a waveform diagram showing the operation of the main parts of FIGS. 1 and 2, and FIGS. 4 and 5. are block circuit diagrams showing different conventional configuration examples corresponding to FIG. 1, and FIG.
FIG. 3 is a waveform diagram showing the operation of the main part of the figure. 1: α command, 50: Firing pulse phase shifter, 6: Gate pulse, 7: Main circuit power supply, 8: Cyrisk rectifier, 9: Synchronous signal, 10: DC voltage, 11: Synchronous machine, 15: F/V Converter, 16: Divider, 17: Multiplier, 18: Amplifier, S
T: sawtooth wave, αF = conversion α command.

Claims (1)

[Claims] 1) A pulse phase shifter for generating pulses of a desired variable phase for an alternating current power source whose frequency can vary, at least a sawtooth wave synchronized with the alternating current power source,
means for generating a sawtooth wave whose waveform ramp portion has a predetermined slope; means for converting a level of a DC signal corresponding to the phase of the pulse to be generated into a level inversely proportional to the frequency of the AC power supply; A pulse phase shifter comprising: means for generating the pulse when the level of the inversely proportional DC signal matches the level of the ramp portion of the sawtooth wave.