Circuit arrangement for generating high voltage pulses

• US 4,782,242 A
• Filed: 01/29/1987
• Issued: 11/01/1988
• Est. Priority Date: 04/11/1985
• Status: Expired due to Fees

• Current Assignee: Adam Kovacs
• Original Assignee: Adam Kovacs
• Inventors: Kovacs, Adam
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): IP, SHIK LUEN PAUL
• Application Number:
  US07/002,619
• Time in Patent Office: 642 Days
• Field of Search: 307/106-110, 123/596, 123/597, 123/600, 123/601, 123/602, 123/604, 123/605, 123/606, 123/620, 123/621, 123/653, 123/654, 123/655, 123/656, 123/648 L, 123/641-643, 315/209 R, 315/209 CD, 315/209 M, 315/209 SC, 315/214, 315/223, 315/225, 315/226
• US Class Current: 307/106
• CPC Class Codes: H02M 3/3385 with automatic control of output voltage or current H02M3/33561 takes precedence
• CPC Class Codes: H03K 17/04213 in bipolar transistor switches
• CPC Class Codes: H03K 17/08146 in bipolar transistor switches
• CPC Class Codes: H03K 17/64 having inductive loads

Abstract

A circuit arrangement for generating high voltage pulses from DC voltage. The circuit includes a transformer comprising at least two primary windings and secondary windings, in which the primary windings are serial connected with at least one diode, a switching circuit and a voltage source. A first capacitor is connected in parallel with the first primary winding and diode, and in series with the secondary primary winding. The switching circuit is formed from the emitter-collector-section of a switching transistor. The output of a transistor amplifier is connected to the base of the switching transistor. The input of the transistor amplifier is coupled with the output of a control circuit. Two serial connected resistors are inserted between the input of the transistor amplifier and the output of the control circuit. The emitter-collector-section of a first transistor is connected to the common terminal of both the resistors. A voltage divider is connected to the base of the first transistor. The leg of the voltage divider on the collector side of the first transistor includes two serial connected resistors. A second capacitor is connected between (a) the point between the two serial connected resistors in the leg of the voltage divider on the collector side of the first transistor, and the common terminal of the primary winding of the transformer and of the switching transistor. A current sensing resistor is connected in series with the emitter-collector-circuit of the switching transistor.

Claims

1. Circuit arrangement for generating high voltage pulses from DC voltage comprising:

a transformer including a secondary winding and at least a first primary winding and a second primary winding;

a rectifying means connected between said first primary winding and said second primary winding;

a first capacitor connected in parallel with said first primary winding and said rectifying means and in series with said second primary winding;

switching means, comprising the emitter-collector section of a switching transistor connected in series with a current sensing means, connected in series with said rectifying means and said first and second primary windings to form a first series circuit;

means for connecting said first series circuit to a voltage source;

a control means;

an amplifying means;

first connecting means for connecting an output of said control means to an input of said amplifying means;

second connecting means for connecting an output of said amplifying means to the base of said switching transistor;

said first connecting means further comprising

first and second resistors connected in series,

the common terminal of said first and second resistors being connected through the emitter-collector section of a first transistor to a first terminal of said voltage source connecting means, and

a voltage divider connected to the base of said first transistor, wherein said voltage divider comprises a first leg including a third resistor and a second leg including a fourth resistor and a fifth resistor connected in series, said first leg connected to a terminal between said switching transistor and said current sensing means, said second leg connected to a second terminal of said voltage connecting means, and a terminal between said fourth and fifth resistors connected through a second capacitor to a terminal between said switching transistor and said primary windings.

2. The circuit of claim 1, wherein said control means comprises:

a pair of actuating contacts, a sixth resistor, and an inductor, all connected in series between said first and second terminals of said voltage source connecting means; and

a second transistor;

wherein said inductor is connected between the base and the emitter of said transistor, the polarity of said second transistor is selected such that it turns on in response to the voltage induced in the inductor when the actuating contacts are opened, and the collector of said second transistor connected to the output of the control means.

3. The circuit of claim 2, wherein said control means further includes a voltage divider between the base of said second transistor and said inductor.

4. The circuit of claim 1, wherein the output of the control means is also connected through a third capacitor to said terminal between said switching transistor and said current sensing means.

5. The circuit of claim 1, further comprising a capacitor connected between the input to said amplifying means and said common terminal between said first and second resistors.

6. Circuit arrangements for generating high voltage pulses from DC voltage comprising:

a transformer including a secondary winding and at least a first primary winding and a second primary winding;

a rectifying means connected in series between said first primary winding and said second primary winding;

a first capacitor connected in parallel with said first primary winding and said rectifying means and in series with said second primary winding;

a second capacitor connected in parallel with said second primary winding and said rectifying means and in series with said first primary winding; and

switching means connected in series with said rectifying means and said first and second primary windings to form a series circuit;

means for connecting said series circuit to a voltage source.