INVERTER

• US 3,781,645 A
• Filed: 05/01/1973
• Issued: 12/25/1973
• Est. Priority Date: 05/01/1973
• Status: Expired due to Term

• Current Assignee: Jury Ivanovich Grom, Vladimir Grigorievich Yatsuk
• Original Assignee: Jury Ivanovich Grom, Vladimir Grigorievich Yatsuk
• Inventors: Grom, Jury Ivanovich, Yatsuk, Vladimir Grigorievich
• Primary Examiner(s): Shoop, Jr., William M.
• Application Number:
  US05/356,196
• Time in Patent Office: 238 Days
• Field of Search: 321/5,45R,45C
• US Class Current: 363/138
• CPC Class Codes: H02M 7/5155 wherein each commutation element has its own extinguishing means

Abstract

An inverter comprising main controlled rectifiers arranged in a 3-phase bridge configuration, shunted by reverse-conducting diodes and connected to a main D.C. source, a switching circuit comprising a switching capacitor and a switching choke coupled into a series string, auxiliary controlled rectifiers interconnected so that one end of said string is connected to three groups of said auxiliary rectifiers in mutual parallel opposition, each said group being coupled with one of the arms of the bridge built around the main controlled rectifiers, whereas the other end of said string is coupled to an arm of a bridge defined by other of said auxiliary rectifiers connected to the main D.C. source, and the switching capacitor is coupled into a diagonal of a symmetrical bridge defined by the rest of said auxiliary rectifiers connected to an additional D.C. source, according to the invention, characterized in that in the switching circuit a symmetrical bridge built around additional diodes is coupled by way of one diagonal to a diagonal of the symmetrical bridge defined by said auxiliary controlled rectifiers, which diagonal includes the switching capacitor, whereas an additional capacitor or a control pulse-generating unit is connected to the other diagonal of said bridge, the output of said control pulse-generating unit being connected with the switching choke circuit. Such an arrangement permits suppressing overvoltages across the switching capacitor and all the elements of the inverter circuitry.

Claims

1. An inverter comprising:

main controlled rectifiers arranged in a 3-phase bridge configuration and connected to a main D.C. source;

reverse-conducting diodes shunting said main controlled rectifiers;

a switching circuit comprising a switching capacitor and a switching choke coupled into a series string, as well as auxiliary contRolled rectifiers interconnected so that one end of said string is coupled to three groups of said auxiliary rectifiers in mutual parallel opposition, each of which groups being connected with one of the arms of siad bridge defined by the main controlled rectifiers, the other end of said string is connected to an arm of a bridge made up of other of said auxiliary rectifiers coupled to said main D.C. source, whereas said switching capacitor is coupled into a diagonal of a symmetrical bridge defined by the remaining auxiliary controlled rectifiers coupled to an additional D.C. source;

additional diodes arranged in a symmetrical bridge configuration and connected by way of one diagonal thereof to a diagonal of said symmetrical bridge defined by said auxiliary controlled rectifiers, which diagonal includes said switching capacitor;

an additional capacitor coupled via a choke into the other diagonal of the symmetrical bridge defined by the additional diodes.

2. An inverter comprising:

main controlled rectifiers arranged in a 3-phase bridge configuration and coupled to a main D.C. source;

reverse-conducting diodes shunting said main controlled rectifiers;

a switching circuit comprising a switching capacitor and a switching choke coupled into a series string as well as auxiliary controlled rectifiers interconnected so that one end of said string is connected to three groups of said auxiliary controlled rectifiers in mutual parallel opposition, each said group being connected with one of the arms of said bridge defined by the main controlled rectifiers, the other end of said string is connected to an arm of the bridge defined by other of said auxiliary rectifiers connected to said main D.C. source, whereas said switching capacitor is coupled into a diagonal of a symmetrical bridge defined by the remaining auxiliary rectifiers connected to an additional D.C. source;

additional diodes arranged in a symmetrical bridge configuration coupled by way of a diagonal thereof to a diagonal of said symmetrical bridge defined by the auxiliary controlled rectifiers, which diagonal includes said switching capacitor;

a control pulse-generating unit connected to the other diagonal of said symmetrical bridge defined by the additional diodes and connected via the output thereof with the circuit of said switching choke.

3. An inverter as of claim 2, wherein as said switching choke there is employed a choke with two half-windings series-coupled into an arm of said bridge defined by said auxiliary controlled rectifiers connected to said main D.C. source and coupled by way of the midpoint thereof with said switching capacitor, whereas said half-windings of said choke are shunted by strings of series-coupled controlled rectifiers and resistors, wherein the control electrodes of said rectifiers are connected with said control pulse-generating unit.