Electric power source for use in electrostatic precipitator

Claim 2

An electric power source for use in an electrostatic precipitator having a discharge electrode, comprising a first high voltage DC source having an output terminal adapted to be connected to the discharge electrode of the electrostatic precipitator, an inductor having one end connected through a coupling capacitor to said output terminal, a controlled rectifier having its anode connected to the other end of said inductor and its cathode connected to ground, a diode connected in reversed parallel to said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and a controller which can supply a trigger pulse to the gate of said controlled rectifier, wherein said controller is an independently operated pulse generator, wherein said second high voltage DC source is connected to said other end of said inductor, and wherein said second high voltage DC source includes a power transformer having a primary winding connected to an AC power source and a secondary winding of a high impedance connected through a rectifier bridge to said inductor.

Claim 3

An electric power source for use in an electrostatic precipitator having a discharge electrode, comprising a first high voltage DC source having an output terminal adapted to be connected to the discharge electrode of the electrostatic precipitator, an inductor having one end connected through a coupling capacitor to said output terminal, a controlled rectifier having its anode connected to the other end of said inductor and its cathode connected to ground, a diode connected in reversed parallel to said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and a controller which can supply a trigger pulse to the gate of said controlled rectifier, wherein said controller is an independently operated pulse generator, wherein said second high voltage DC source is connected to said other end of said inductor, and wherein said second high voltage DC source includes a power transformer having a primary winding connected to an AC power source and a secondary winding connected to a rectifier bridge, said rectifier bridge having an output which is connected through a high impedance element to said inductor.

Claim 4

An electric power source for use in an electrostatic precipitator having a discharge electrode, comprising a first high voltage DC source having an output terminal adapted to be connected to the discharge electrode of the electrostatic precipitator, an inductor having one end connected through a coupling capacitor to said output terminal, a controlled rectifier having its anode connected to the other end of said inductor and its cathode connected to ground, a diode connected in reversed parallel to said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and a controller which can supply a trigger pulse to the gate of said controlled rectifier, wherein said controller is an independently operated pulse generator, wherein said second high voltage DC source is connected to said other end of said inductor, and wherein said second high voltage DC source includes a power transformer having a primary winding connected to an AC power source and a secondary winding connected to a rectifier bridge, said rectifier bridge having an output which is connected through a high impedance element to said inductor.

Claim 5

An electric power source for use in an electrostatic precipitator having a discharge electrode, comprising a first high voltage DC source having an output terminal adapted to be connected to the discharge electrode of the electrostatic precipitator, an inductor having one end connected through a coupling capacitor to said output terminal, a controlled rectifier having its anode connected to the other end of said inductor and its cathode connected to ground, a diode connected in reversed parallel to said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and a controller which can supply a trigger pulse to the gate of said controlled rectifier, wherein said second high voltage DC source is connected to said other end of said inductor, and wherein said second high voltage DC source includes a power transformer having a primary winding connected to an AC power source and a secondary winding of a high impedance connected through a rectifier bridge to said inductor.

Claim 6

An electric power source for use in an electrostatic precipitator having a discharge electrode, comprising a first high voltage DC source having an output terminal adapted to be connected to the discharge electrode of the electrostatic precipitator, an inductor having one end connected through a coupling capacitor to said output terminal, a controlled rectifier having its anode connected to the other end of said inductor and its cathode connected to ground, a diode connected in reversed parallel to said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and a controller which can supply a trigger pulse to the gate of said controlled rectifier, wherein said second high voltage DC source is connected to said other end of said inductor, and wherein said second high voltage DC source includes a power transformer having a primary winding connected to an AC power source and a secondary winding of a high impedance connected through a rectifier bridge to said inductor.

Claim 7

An electric power source for use in an electrostatic precipitator having a discharge electrode, comprising a first high voltage DC source having an output terminal adapted to be connected to the discharge electrode of the electrostatic precipitator, an inductor having one end connected through a coupling capacitor to said output terminal, a controlled rectifier having its anode connected to the other end of said inductor and its cathode connected to ground, a diode connected in reversed parallel to said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and a controller which can supply a trigger pulse to the gate of said controlled rectifier, wherein said second high voltage DC source is connected to said other end of said inductor, and wherein said second high voltage DC source includes a power transformer having a primary winding connected to an AC power source and a secondary winding connected to a rectifier bridge, said rectifier bridge having an output which is connected through a high impedance element to said inductor.

Claim 8

An electric power source for use in an electrostatic precipitator having a discharge electrode, comprising a first high voltage DC source having an output terminal adapted to be connected to the discharge electrode of the electrostatic precipitator, an inductor having one end connected through a coupling capacitor to said output terminal, a controlled rectifier having its anode connected to the other end of said inductor and its cathode connected to ground, a diode connected in reversed parallel to said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and a controller which can supply a trigger pulse to the gate of said controlled rectifier, wherein said second high voltage DC source is connected to said other end of said inductor, and wherein said second high voltage DC source includes a power transformer having a primary winding connected to an AC power source and a secondary winding connected to a rectifier bridge, said rectifier bridge having an output which is connected through a high impedance element to said inductor.

Claim 9

An electric power source for an electrostatic precipitator, including a first high voltage DC source having an output terminal adapted to be connected to a discharge electrode of the electrostatic precipitator, and a pulse generator adapted to be connected to the discharge electrode of the electrostatic precipitator through a coupling capacitor, so that a DC voltage superimposed with a pulse voltage is applied to the discharge electrode of the electrostatic precipitator, wherein the improvement comprises said pulse generator including an inductor having one end connected to an end of said coupling capacitor opposite to the end thereof connected to the discharge electrode, a controlled rectifier having a gate, having an anode connected to a second end of said inductor remote from said one end thereof, and having a cathode connected to ground, a diode connected in parallel with said controlled rectifier so as to have its direction of conduction opposite to that of said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and controller means for supplying to said gate of said controlled rectifier a trigger pulse which makes said controlled rectifier conductive.

Claim 10

An electric power source for an electrostatic precipitator, including a first high voltage DC source having an output terminal adapted to be connected to a discharge electrode of the electrostatic precipitator, and a pulse generator adapted to be connected to the discharge electrode of the electrostatic precipitator through a coupling capacitor, so that a DC voltage superimposed with a pulse voltage is applied to the discharge electrode of the electrostatic precipitator, wherein the improvement comprises said pulse generator including an inductor having one end connected to an end of said coupling capacitor opposite to the end thereof connected to the discharge electrode, a controlled rectifier having a gate, having an anode connected to a second end of said inductor remote from said one end thereof, and having a cathode connected to ground, a diode connected in parallel with said controlled rectifier so as to have its direction of conduction opposite to that of said controlled rectifier, a second high voltage DC source having a high output impedance and connected to said inductor, and controller means for supplying to said gate of said controlled rectifier a trigger pulse which makes said controlled rectifier conductive.

Claim 11

An electric power source as set forth in claim 5, wherein said controller means includes an independently operated pulse generator.

Claim 12

An electric power source as set forth in claim 6, wherein said second high voltage DC source is connected to said second end of said inductor.

Claim 13

An electric power source as set forth in claim 7, wherein said second high voltage DC source includes a rectifier bridge and a power transformer having a primary winding connected to an AC power source and a secondary winding of high impedance connected through said rectifier bridge to said inductor.

Claim 14

An electric power source as set forth in claim 8, wherein said diode is a part of said rectifier bridge.

Claim 15

An electric power source as set forth in claim 7, wherein said second high voltage DC source includes a rectifier bridge, a high impedance element, and a power transformer having a primary winding connected to an AC power source and a secondary winding connected to said rectifier bridge, said rectifier bridge having an output which is connected through said high impedance element to said inductor.

Claim 16

An electric power source as set forth in claim 8, wherein said second high voltage DC source is connected to said one end of said inductor.

Claim 17

An electric power source as set forth in claim 11, wherein said second high voltage DC source includes a rectifier bridge, a high impedance element, and a power transformer having a primary winding connected to an AC power source and a secondary winding connected to said rectifier bridge, said rectifier bridge having an output which is connected through said high impedance element to said inductor.

Claim 18

An electric power source as set forth in claim 5, wherein said second high voltage DC source is connected to said second end of said inductor.

Claim 19

An electric power source as set forth in claim 13, wherein said second high voltage DC source includes a rectifier bridge and a power transformer having a primary winding connected to an AC power source and a secondary winding of high impedance connected through said rectifier bridge to said inductor.

Claim 20

An electric power source as set forth in claim 14, wherein said diode is a part of said rectifier bridge.

Claim 21

An electric power source as set forth in claim 13, wherein said second high voltage DC source includes a rectifier bridge, a high impedance element, and a power transformer having a primary winding connected to an AC power source and a secondary winding connected to said rectifier bridge, said rectifier bridge having an output which is connected through said high impedance element to said inductor.

Claim 22

An electric power source as set forth in claim 5, wherein said second high voltage DC source is connected to said one end of said inductor.

Claim 23

An electric power source as set forth in claim 17, wherein said second high voltage DC source includes a rectifier bridge, a high impedance element, and a power transformer having a primary winding connected to an AC power source and a secondary winding connected to said rectifier bridge, said rectifier bridge having an output which is connected through said high impedance element to said inductor.

Claim 24

An electric power source as set forth in claim 5, wherein said controlled rectifier includes a plurality of thyristors connected in series.

Claim 25

An electric power source as set forth in claim 5, wherein said controlled rectifier is a thyratron.