JPH04133673A - High voltage pulse generating circuit - Google Patents

Abstract

PURPOSE:To get a high voltage pulse generating circuit which is small and low in manufacturing cost by providing it with a switching circuit, which opens and closes according to the trigger signal outputted from a trigger circuit and makes the input of a high voltage generating circuit a power source voltage or none. CONSTITUTION:An AC input switch circuit 2 is interposed between one output end of an AC power source 9 and one input end of a high voltage generating circuit 1. And in initial condition, a trigger signal is not output from a trigger circuit 5, and the AC input switch circuit 2 gets in on condition and an output switch circuit 6 gets in off condition. Next, a high voltage generating circuit 1 generates DC high voltage, and charges a capacitor 4. Next, when a trigger signal is output from the trigger circuit 5, the output switch circuit 6 gets in on condition, and the AC input switch circuit 2 gets in off condition, and the charge charged in the capacitor 4 is output to output terminals 10a and 10b. Hereby, a large current can be prevented from flowing to the high voltage generating circuit at occurrence of high voltage pulses.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-voltage pulse generation circuit suitable for a measuring device that applies high-voltage pulses to the electrodes of an electron tube to measure the characteristics of the electron tube.

[Prior Art] FIG. 3 is a circuit diagram showing a conventional high voltage pulse generation circuit.

An AC (alternating current) power source 19 is connected between a pair of input terminals of the high voltage generation circuit 11, and receives an AC voltage and generates a high voltage DC voltage. Further, a resistor 13 and a capacitor 14 are connected in series between a pair of output terminals of this high voltage generating circuit 11. The connection point between the resistor 13 and the capacitor 14 is connected to the output terminal 20a via the output switch circuit 16, and the connection point between the capacitor 14 and the high voltage generation circuit 11 is connected to the output terminal 20b. It is connected.

The output switch circuit 16 is connected to the trigger circuit 15, and its operation is controlled by a trigger signal output from the trigger circuit 15. That is, the output switch circuit 16
is normally in an off state, and turns on when a trigger signal is output from the trigger circuit 15.

Next, the operation of the high voltage pulse generation circuit configured as described above will be explained.

An AC power supply 1 is connected between a pair of input terminals of the high voltage generation circuit 11.
AC voltage is applied from 9. The high voltage generation circuit 11 generates a DC high voltage by boosting and rectifying this AC voltage. This high voltage is applied to both ends of a capacitor 14 via a resistor 13, and charges are accumulated in this capacitor 14.

When the trigger signal is output from the trigger circuit 15, the output switch circuit 16 is turned on. Then, the electric charge accumulated in the capacitor 14 becomes swish.

Discharged via the child circuit 16 and output terminal 20a.

A high voltage pulse is output during 2Ob.

[Problems to be Solved by the Invention] However, the above-described conventional high-voltage pulse generation circuit has the following drawbacks. That is, the high voltage generation circuit 11 is constantly supplied with power from the AC power supply 19. Therefore, when the output switch circuit 16 is triggered and turns on, the charge accumulated in the capacitor 14 flows into the output switch circuit 16, and at the same time, the charge accumulated in the capacitor 14 flows from the high voltage generation circuit 11 to the resistor 1.
A relatively large current flows through 3. Therefore, in the conventional high-voltage pulse generation circuit, it is necessary to use a high-voltage generation circuit 11 with a large electric capacity, which makes it difficult to reduce manufacturing costs and downsize the device.

The present invention has been made in view of such problems, and includes:
It is an object of the present invention to provide a high-voltage pulse generation circuit that can use a high-voltage generation circuit with a small electric capacity, reduce manufacturing costs, and downsize the device.

[Means for Solving the Problems] A high-voltage pulse generation circuit according to the present invention includes an AC power source, a high-voltage generation circuit that inputs power from the AC power source and outputs a DC voltage, and a trigger circuit that outputs a trigger signal. A first switch circuit that opens and closes in response to the trigger signal to switch the input of the high voltage generation circuit to the power supply voltage of the AC power supply or a non-input state, and a first switch circuit connected in series between the pair of output terminals of the high voltage generation circuit. a second switch circuit interposed between a resistor and a capacitor, a connection point of the resistor and capacitor and an output terminal, and opened and closed by the trigger signal to electrically connect and disconnect between the connection point and the output terminal; It is characterized by having the following.

[Function] In the present invention, a first switch circuit is provided for switching the input of the high voltage generation circuit to the power supply voltage of the AC power supply or to a non-input state, and the voltage between the first switch circuit, the capacitor, and the output terminal is provided. The second switch circuits interposed in both are opened and closed by a trigger signal output from the trigger circuit. That is, in the high voltage pulse generation circuit according to the present invention, when the trigger signal is not output from the trigger circuit, the first switch circuit applies an AC voltage from the AC power source between the pair of input terminals of the high voltage generation circuit. The second switch circuit electrically disconnects the capacitor from the output terminal, allowing charge to accumulate in the capacitor. When the trigger signal is output from the trigger circuit, the first switch circuit sets the input of the high voltage generation circuit to a non-input state to stop the application of AC voltage, and the second switch circuit connects the capacitor and The capacitor is electrically connected to the output terminal so that the charge accumulated in the capacitor is outputted to the output terminal as a high voltage pulse.

In this way, in the high-voltage pulse generation circuit according to the present invention, no alternating voltage is applied to the high-voltage generation circuit when a high-voltage pulse is generated, so that it is possible to avoid large current from flowing through the high-voltage generation circuit. Therefore, it is possible to use a high voltage generation circuit with a small electric capacity, and it is possible to downsize the device and reduce manufacturing costs.

[Embodiments] Next, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a circuit diagram showing a high voltage pulse generation circuit according to a first embodiment of the present invention.

An AC input switch circuit 2 is interposed between one output end of the AC power supply 9 and one input end of the high voltage generation circuit 1. are mutually connected to the input terminals of. In addition, a resistor 3 is connected between the pair of output terminals of this high voltage generating circuit 1, as in the conventional case.
and a capacitor 4 are connected in series. This resistance 3
The connection point between the capacitor 4 and the capacitor 4 is connected to the output terminal 10a via the output switching circuit 6. Further, the connection point between the capacitor 4 and the high voltage generation circuit 1 is connected to the output terminal 10b.

The AC input switch circuit 2 and the output switch circuit 6 are both connected to the output of the trigger circuit 5, and are controlled by the output of the trigger circuit 5 to turn on and off.

That is, the AC input switch circuit 2 is normally in the on state,
When a trigger signal is output from the trigger circuit 5, the switch is turned off. On the other hand, the output inch circuit 6 is normally in an off state, and turns on when a trigger signal is output from the trigger circuit 5.

Next, the operation of the high voltage pulse generation circuit according to this embodiment will be explained.

In the initial state, a trigger signal is output from the trigger circuit 5, the AC input switch circuit 2 is in an on state, and the output switch circuit 6 is in an off state.

The high voltage generation circuit 1 boosts and rectifies the alternating current voltage applied from the AC power source 9 to generate a direct current high voltage. This voltage is applied to the capacitor 4 via the resistor 3, and the capacitor 4 is charged.

When a trigger signal is output from the trigger circuit 5, the output inch circuit 6 is turned on, and the AC input inch circuit 2 is turned on.
is turned off. Then, the capacitor 4 discharges the charged electric charge, and this electric charge is outputted to the output terminals 10a and 10b as a pulse voltage. In this case, AC
Since the input switch circuit 2 is in the off state, the output terminal 1
0a.

While the pulse voltage is being outputted to 10b, the supply of power to the high voltage generation circuit 1 is stopped. Therefore, the capacitance of the high voltage generating circuit 1 only needs to be large enough to charge the capacitor 4, and can be significantly reduced compared to the conventional circuit.

FIG. 2 is a circuit diagram showing a high voltage pulse generation circuit according to a second embodiment of the present invention.

This embodiment differs from the first embodiment in that the configuration between the AC power supply 9 and the high voltage generation circuit 1 is different, and the other configurations are basically the same as the first embodiment. , second
In the figure, the same parts as in FIG. 1 are given the same reference numerals, and detailed explanation thereof will be omitted.

In this embodiment, an AC input switch circuit 8 is connected between a pair of input terminals of the high voltage generation circuit 1, and a resistor 7 is connected between one input terminal of the high voltage generation circuit 1 and an AC power supply 9. It has been intervened. This AC input switch circuit 8 is connected to the trigger circuit 5. The AC input switch circuit 8 is normally in an off state, and is turned on when a trigger signal is output from the trigger circuit 5.

Next, the operation of the high voltage pulse generation circuit according to this embodiment will be explained.

In the initial state, no trigger signal is output from the trigger circuit 5, and both the AC input switch circuit 8 and the output switch circuit 6 are in an off state. Therefore, an alternating current voltage is applied to the high voltage generating circuit 1 from the AC power source 9 via the resistor 7. The high voltage output circuit 1 boosts and rectifies this AC voltage to generate a DC high voltage.

This high voltage is applied to the capacitor 4 via the resistor 3,
Charge is accumulated in the capacitor 4.

When the trigger signal is output from the trigger circuit 5, the AC input switch circuit 8 and the output switch circuit 6 are turned on. Thereby, the charge accumulated in the capacitor 4 reaches the output terminal 10a via the output switching circuit 6, and a high voltage pulse is output between the output terminals 10a and 10b. On the other hand, the current supplied from the AC power supply 9 passes through the resistor 7
The voltage flows to the C input switch circuit 8, and the voltage between the pair of input terminals of the high voltage generation circuit 1 becomes OV. Therefore, high voltage generation circuit 1
Since no large current flows through the high voltage generating circuit 1, the capacitance of the high voltage generating circuit 1 can be reduced compared to the conventional one, as in the first embodiment. In this embodiment, since the alternating current consumed to charge the capacitor 4 does not pass through the AC input switch circuit 8, there is an advantage that the current capacity of the AC input switch circuit 8 can be reduced.

[Effects of the Invention] As explained above, according to the present invention, a first switch circuit is provided that opens and closes in response to a trigger signal output from a trigger circuit to switch the input of the high voltage generation circuit to the power supply voltage or to a non-input state. Therefore, it is possible to suppress large current from flowing through the high voltage generation circuit when a high voltage pulse is generated. Therefore, the high voltage generating circuit only needs to have a small current capacity, and it is possible to obtain a high voltage pulse generating circuit that is small and has low manufacturing cost.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a high voltage pulse generating circuit according to a first embodiment of the present invention, FIG. 2 is a circuit diagram showing a high voltage pulse generating circuit according to a second embodiment of the present invention, and FIG. FIG. 2 is a circuit diagram showing a conventional high-voltage pulse generation circuit. 1.11; High voltage generation circuit, 2, 8; AC input switch circuit, 3, 7, 13; Resistor, 4.14; Capacitor, 5,
15;) Riga circuit, 6; Output switch circuit, 9゜19; AC! Source, 20a, 20b: Output terminal

Claims (1)

[Claims] (1) an AC power supply, a high voltage generation circuit that inputs power from the AC power supply and outputs a DC voltage, a trigger circuit that outputs a trigger signal, and the input of the high voltage generation circuit that opens and closes according to the trigger signal. A first switch circuit that switches the power supply voltage to a non-input state, a resistor and a capacitor connected in series between a pair of output terminals of the high voltage generating circuit, and a connection point of the resistor and capacitor and an output terminal. 1. A high voltage pulse generation circuit, comprising: a second switch circuit interposed between the connection point and the output terminal, the second switch circuit being opened and closed in response to the trigger signal to electrically connect and disconnect between the connection point and the output terminal.