JPS5923650B2 - Line type pulse modulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to line pulse modulators, and more particularly to pulse stabilization thereof.

FIG. 1 shows a typical example of a conventional line-type pulse modulator.

In the figure, 1 is an induction voltage regulator (hereinafter abbreviated as IVR), 2 is a transformer, 3 is a rectifier circuit, 4 is a filter choke, 5 is a filter capacitor, 6 is a charging coil,
7 is a dequeuing circuit connected to the secondary coil of the charging coil 6, which includes a thyristor 71 and a capacitor 72.
, and a resistor 73.

This dequeuing circuit functions to reduce the Q value of the charging coil 6 when the cyrisk 71 is fired.

8 is a charging diode connected in series to the primary coil of charging coil 6, 9 is a thyratron, 10 is a shunt diode connected between both terminals of thyratron 9 via a resistor 101, and 11 is a large number of coils 111 and a capacitor. 112 (
Hereinafter abbreviated as PFN, 12 is a load, 13 is a dequeuing monitor connected between the charging coil 6 and the charging diode 8, and a resistor 131 is connected in series.
132, and monitors the voltage level at point B.

A DC high voltage monitor 14 is composed of resistors 141 and 142, and monitors the voltage level at the 0 point.

15 is a thyratron drive circuit that applies a trigger signal to the gate G of the thyratron 9 to make it conductive; 16 is a dequeuing level setter; 17 is a Schmitt trigger circuit; the voltage level at point B of the dequeuing monitor 13 is a dequeuing level setter; When the set level of 16 is reached, a firing signal is applied to the thyristor 71 of the dequeuing circuit 7 to make it conductive.

18 is an IVR level setter that sets the output level of the IVRI, and 19 is a differential amplifier that differentially amplifies the voltage level at the 0 point of the DC high voltage monitor 14 and the set level of the IVR level setter 18. .

M is an IVR drive motor which controls IVRl according to the output of the differential amplifier 19 and operates so that the output matches the set level.

Next, its operation will be explained.

The high voltage output of the transformer 2 is converted into DC by a rectifier circuit 3 and smoothed by a filter choke 4 and a filter capacitor 5.

This smoothed DC power causes the charging coil 6 to
The capacitor 112 of PFNll is charged through the charging diode 8 and the charging diode 8. However, when a trigger signal is given to the gate G of the thyratron 9 from the thyratron drive circuit 15, the thyratron 9 becomes conductive and the capacitor 11
The charge of 2 is discharged through the thyratron 9.

A predetermined pulse is applied to the load 12 by discharging the capacitor 112.

FIG. 3 is a waveform diagram showing the above operation, where a is the thyratron 9
Trigger signal waveform given to gate G of PFNl
l is the voltage waveform, and d is the output pulse voltage waveform applied to the load 12.

In this circuit, the DC voltage is monitored by the DC high voltage monitor 14, and the voltage level signal at point C is compared with the set level of the IVR level setter 18 by the differential amplifier 19, and an output is made according to the deviation. The IVR drive motor M is operated to adjust the output of IVRl.

This stabilizes the DC high voltage.

On the other hand, the voltage level signal at point B monitored by the dequeuing monitor 13 is compared with the set level Vo of the dequeuing level setter 16, as shown in FIG. 3, and when the voltage level reaches the set level Vo. When the Schmitt trigger circuit 17 issues a trigger signal, the thyristor 71 of the dequeuing circuit 7 becomes conductive.

Due to the conduction of this thyristor 71, the charging coil 6
The Q value of is reduced, and the PFN 11 is no longer charged.

In this way, the charging voltage of PFNl 1 is stabilized.

The broken lines shown in FIG. 3 indicate voltage waveforms at various parts when the dequeuing circuit 7 operates.

The conventional line-type pulse modulator is configured as described above, but in order to stabilize the pulse output, the IVR level setter 18 and the dequeuing level setter 16 are provided independently, and both Level matching is complicated,
Even if the output pulse voltage is constant, there are many combinations of levels of the side setting device, so there is a drawback that the stability of the output varies depending on the setting position.

This invention was made to eliminate the above-mentioned drawbacks of conventional devices, and by using a common level setter for setting the levels of the IVR and dequeuing circuit, the operating time phase of the dequeuing circuit can be adjusted. This is intended to improve the stability of the output pulse by keeping it almost constant.

An embodiment of the present invention will be described in detail below with reference to the drawings.

20 is a Schmitt trigger circuit that compares the voltage at point B monitored by the dequeuing monitor 13 with the set level of the IVR level setter 18, and when the voltage at point B reaches the set level, the dequeuing circuit 7 A trigger signal is generated to the thyristor 71 to make it conductive.

That is, IV is used to set the operating level of the dequeuing circuit 7.
This uses an R level setter 18.

The rest of the configuration is the same as that in FIG. 1.

In the apparatus of the present invention configured as described above, now, IV.
Assuming that the setting level of the R level setter 18 is increased,
IVRl is adjusted by the motor M to increase the output, and the level at point C of the DC high voltage monitor 14 also rises, and when the set level of the IVR level setter 18 and the level at point C match, the DC high voltage output becomes stable.

Along with this, the voltage level at point B of the dequeuing level setter 13 also increases, and when that level reaches the set level of the IVR level setter 18, a trigger signal is sent from the Schmitt trigger circuit 20 to the thyristor 71. PFNI 1 conducts and stabilizes the charging voltage of PFNI 1.

What should be noted here is that the level setting IVR level setter 18 of the dequeuing circuit 7 is shared, and when the set level is changed, if the level at point C of the DC high voltage monitor 14 becomes high, the dequeuing monitor Since the level at point B of No. 13 also becomes high, the operating time phases of the dequeuing circuit γ are the same, that is, the differential coefficients of the dequeuing voltages with respect to time have the same value.

Therefore, the delay and rise time of the trigger output from the Schmitt trigger circuit 20 to the thyristor 71 remain unchanged, and the dequeuing circuit 7 exhibits the same operating characteristics.

On the other hand, if the input AC voltage fluctuates due to a disturbance, first the dequeuing circuit 7 operates at the set level and the I
The VRI is also controlled to follow the set level, and the operation of the dequeuing circuit 7 settles down to the above-mentioned dominant time phase.

In other words, the output pulse voltage is stabilized, and at the same time, substantially equal output stability is always obtained.

In the above embodiments, the IVR level setter is commonly used for setting the level of the dequeuing circuit, but a conventional dequeuing level setter may also be used for setting the level of the IVR.

As described above, according to the present invention, the level setting of the dequeuing circuit and the level setting of the IVR are performed by one level setting device, which not only simplifies the operation but also improves the stability of the output pulse. This has the advantage of improving.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional device, FIG. 2 is a circuit diagram of a device according to an embodiment of the present invention, and FIGS. 3a and 3b. c and d are explanatory diagrams for explaining the operation of the apparatus shown in FIG. 2; In the figure, 1... Induction voltage regulator, 2...
...Transformer, 3... Rectifier circuit, 4...
Filter choke, 5...Filter capacitor, 6...Charging coil, 7...
Dequeuing circuit, T1..., Iristor,
8...Charging diode, 9...
・Thyratron, 10... Shunt diode, 11... Pulse shaping circuit network, 111...
...Coil, 112...Capacitor, 12...
...Load, 13...Dequeuing monitor, 14...DC high pressure monitor, 15...
Thyratron drive circuit, 18...IVR level setter, 19...Differential amplifier, 20...
. . . Schmitt trigger circuit, M . . . IVR drive motor. It should be noted that the same reference numerals in the drawings indicate corresponding parts.

Claims (1)

[Claims] 1 an inductive voltage regulator and a pulse shaping circuitry charged by the DC output regulated by the inductive voltage regulator;
A switching device that conducts at a predetermined period to discharge the charge accumulated in the pulse shaping circuit network to generate a pulse, and a dequeuing circuit that stops charging the pulse shaping circuit network when activated, The induction voltage regulator and the dequeuing circuit are operated based on set values, characterized by having a common level setter for setting the operating values of the induction voltage regulator and the dequeuing circuit. line type pulse modulator.