JPH0128537B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-voltage pulse generation circuit, and more particularly to a high-voltage pulse generation circuit that can generate pulses with stable waveforms.

A high voltage pulse supplied to a microwave oscillator tube or the like is required to have a pulse peak value that is highly precisely constant. By the way, as a conventional device for generating high voltage pulses, as shown in FIG.
There is a device in which the output of the converter is boosted by a step-up transformer 2 and supplied to the load side. In the figure, 3 is a power supply, 4 is a power transformer, 5 is a rectifying element, 6 and 7 are switching elements, and 8 is an output terminal.

Therefore, in the structure configured in this way,
The efficiency is high because all the energy stored in the pulse forming circuit 1 is released to the load side, but since the rise of the pulse is suppressed by the inductance of the pulse forming circuit 1, a pulse with a long pulse time may have a steep rise. In addition to not having a stable rise, ripples and sag occur in the pulse waveform, making it difficult to meet the above-mentioned requirements.

In contrast, as shown in FIG. 2, a high voltage capacitor 9 is charged and the voltage of this capacitor 9 is used as a power source to perform pulse modulation with a high voltage vacuum tube 10 and to stabilize the pulse waveform. It is possible that In the figure, 11 is a voltage divider and 12 is a control circuit.

However, in such a configuration, the higher the voltage of the output pulse, the higher the voltage and large capacity capacitor 9 and the higher voltage vacuum tube 10 are required, and this type of pulse generation circuit is therefore expensive. There is a problem with becoming.

The present invention is characterized in that high-voltage pulses are generated using a low-voltage pulse forming circuit and a pulse transformer, and that vacuum tubes are connected in a shunt circuit to control the voltage of the output pulses. That is,
A suitable voltage for the vacuum tube is selected, such as the intermediate tap of the primary winding, tertiary winding, or secondary winding of a step-up pulse transformer, and the terminals are connected to form a shunt using this vacuum tube.

Next, one embodiment of the present invention will be described with reference to FIG. 21 is an AC power supply, 22 is a power transformer, 23 is a rectifier circuit, 24 is a low voltage pulse forming circuit composed of L, C, etc., 25 and 26 are switching elements, and 27 is a step-up pulse transformer. . An output terminal 28 is provided at one end of the secondary winding 27S of this pulse transformer 27, and the other end is grounded. and a voltage divider 29 for measuring the voltage of the output pulse.
is provided. The vacuum tube 30 is shunt connected to the tertiary winding 27T of the pulse transformer 27 and is controlled by a control circuit 31. 32 is a comparator to which the measured voltage V from the voltage divider 29 and the reference voltage V _ref are input.

Next, the operation of the device configured as described above will be explained. First, prior to pulse generation, vacuum tube 3
0 stands by in a state of maximum conduction (lowest impedance). Next, the pulse forming circuit 24 starts supplying current to the primary winding 27P of the pulse transformer 27 by making the switching element 25 conductive.
Now, if the initial voltage of the pulse forming circuit 24 is E and the impedance is Z, a current I of E/Z flows out of the pulse forming circuit 24, but as mentioned above,
Since the vacuum tube 30 is at maximum conduction, no output appears at the secondary winding 27S of the pulse transformer 27. Then, when the current rises, the control circuit 31
A command to raise the voltage is given to the vacuum tube 30, and as a result, the output voltage at the secondary winding 27S rises rapidly in the process of the vacuum tube 30 changing to a high resistance.

Incidentally, the output voltage of the pulse forming circuit 24 inevitably has ripples, sag, etc., and a bad pulse waveform is unavoidable, but the waveform can be shaped by controlling the pulse waveform using the vacuum tube 30 to make it constant. . That is, when the input voltage of the pulse transformer 27 pulsates, when the voltage increases, a large amount of current is passed through the vacuum tube 30, and when the voltage decreases, the current is decreased to control the output voltage to be constant. Of course, these controls are performed by the control circuit 31 based on the input of the comparator 32.

As described above, according to the present invention, the vacuum tube 30 is connected in a shunt circuit and the output pulse voltage is controlled by appropriately controlling the vacuum tube 30. Therefore, the waveform of the output high voltage pulse is A pulse with a stable waveform without ripples, sag, etc. and a fast rise can be obtained. Further, in the present invention, there is no need to use a high-voltage, large-capacity capacitor or a high-voltage vacuum tube, so this type of pulse generation circuit can be constructed at low cost.

In the embodiment shown in FIG. 3, a vacuum tube 30 is provided at the tertiary winding 27T of the pulse transformer 27, but this vacuum tube 30 is provided between the terminals of the primary winding 27P as shown in FIG. However, as shown in FIG. 5, the middle tap 27M of the secondary winding 27S
Even if it is provided between the end of the secondary winding 27S and the other end of the secondary winding 27S, the above-mentioned effects do not change at all.

[Brief explanation of drawings]

Figures 1 and 2 are electrical wiring diagrams showing a conventional example, Figure 3 is an electrical wiring diagram showing an embodiment of the present invention, and Figure 4 is an electrical wiring diagram showing an embodiment of the present invention.
5 are electrical wiring diagrams showing other embodiments of the present invention. 24... Pulse forming circuit, 27... Pulse transformer, 30... Vacuum tube.

Claims (1)

[Claims] 1. In a pulse transformer that connects a pulse shaping circuit to the primary side and generates high voltage pulses from the output terminal of the secondary side, a shunt circuit is connected between the terminals of any of the windings of the pulse transformer. The output voltage of the pulse transformer is compared with the reference voltage, and when the output voltage is higher than the reference voltage, the current flowing through the vacuum tube is increased, and conversely, the output voltage is lower than the reference voltage. A high voltage pulse generation circuit characterized by controlling the current flowing through the vacuum tube to be reduced.