DC/AC Bridge inverter including a switching aid and inductive energy recovery circuit

• US 4,446,513 A
• Filed: 02/09/1982
• Issued: 05/01/1984
• Est. Priority Date: 06/13/1980
• Status: Expired due to Fees

• Current Assignee: La Telemecanique Electrique
• Original Assignee: La Telemecanique Electrique
• Inventors: Clenet, Daniel
• Primary Examiner(s): BEHA JR, WILLIAM
• Application Number:
  US06/359,712
• Time in Patent Office: 812 Days
• Field of Search: 363/96, 363/98, 363/132, 363/136-138, 318/801-803
• US Class Current: 363/132
• CPC Class Codes: H02M 7/5387 in a bridge configuration
• CPC Class Codes: H03K 17/08146 in bipolar transistor switches

Abstract

A DC/AC converter consisting of bridge-connected transistors or thyristors and bridge-connected recovery diodes, wherein the center points of the diode bridge are connected with the corresponding center points of the transistor or thyristor bridge, including a switching aid inductor (L₁, L₂, 17, 18) in each half-bridge, to which is connected one terminal of a storage capacitor (C₁, C₃, 21, 22) the other terminal of which is connected to the input of a respective energy recovery circuit (RE₁, RE₂, 23, 24) the outputs of which are connected to the supply terminals of the DC/AC converter.

Claims

1. A DC/AC inverter device comprising:

a supply source having first and second DC supply terminals;

a plurality of paired thyristors mounted in a thyristor bridge having first and second pole terminals, each pair of thyristors having a junction point;

a load having phases input terminals, each connected to a junction point of one respective pair of thyristors;

a plurality of paired recovery diodes mounted in a recovery diode bridge having first and second pole terminals, each pair of recovery diodes having a junction point connected to a junction point of a corresponding pair of thyristors;

first connecting circuit means having an input terminal connected to the first DC supply terminal, and an output terminal connected to the first pole terminal of the thyristor bridge, said first connecting circuit means comprising in series a first inductor and a first transistor, and a junction terminal between said first inductor and said first transistor;

first parallel circuit means comprising a first diode having a first electrode connected to the junction point of said first inductor and said first transistor and a second electrode, and a first storage capacitor having a first electrode connected to the first DC supply terminal and a second electrode connected to the second electrode of said first diode and to the first terminal pole of the recovery diode bridge;

first low voltage-high voltage converter circuit means having two input terminals respectively connected to the first and second electrodes of the first storage capacitor and two output terminals respectively connected to the first and the second DC supply terminals;

a first switching aid capacitor having a first electrode connected to the first terminal pole of the thyristor bridge and a second electrode connected to the second electrode of the said first diode;

second connecting circuit means having an input terminal connected to the second DC supply terminal, and an output terminal connected to the second pole terminal of the thyristor bridge, said second connecting circuit means comprising in series a second inductor and a second transistor, and a junction terminal between said second inductor and said second transistor;

second parallel circuit means comprising a second diode having a first electrode connected to the junction point of said second inductor and said second transistor, and a second electrode, and a second storage capacitor having a first electrode connected to the second DC supply terminal and a second electrode connected to the second electrode of said second diode and to the second terminal pole of the recovery diode bridge;

second low voltage-high voltage converter circuit means having two input terminals respectively connected to the first and second electrodes of the second storage capacitor and two output terminals respectively connected to the first and second DC supply terminals;

a second switching aid capacitor having a first electrode connected to the second terminal pole of the thyristor bridge and a second electrode connected to the second electrode of the said second diode.

2. A DC/AC inverter device according to claim 1, in which said second electrode of said first switching aid capacitor is connected to the junction point of said first storage capacitor and said first inductor and in which said second electrode of said second switching aid capacitor is connected to the junction point of said second storage capacitor and said second inductor.

3. A DC/AC inverter device comprising:

a supply source having first and second DC supply terminals;

a plurality of paired transistors mounted in a transistor bridge having first and second pole terminals, each pair of transistors having a junction point;

a load having phase input terminals, each connected to a junction point of one respective pair of transistors;

a plurality of paired recovery diodes mounted in a diodes bridge having first and second pole terminals, each pair of recovery diodes having a junction point connected to a junction point of a corresponding pair of transistors;

a first inductor mounted between said first pole terminal of the transistor bridge and said first pole terminal of the diodes bridge;

first connecting circuit means having an input terminal connected to the first terminal pole of the transistor bridge and an output terminal connected to the first DC supply terminal, said first connecting circuit means comprising in series a first diode having a first electrode connected to the first terminal pole of the thyristor bridge, and a second electrode, and a first storage capacitor having a first electrode connected to the first DC supply terminal and a second electrode connected to the second electrode of the said first diode;

a first plurality of switching aid capacitors, each comprising a first electrode connected to the second electrode of the first diode and a second capacitor connected to the junction point of a corresponding pair of transistors of the transistor bridge;

first low voltage-high voltage means having two input terminals respectively connected to the first and second capacitor electrodes of the first storage capacitor and two output terminals respectively connected to the first and second DC supply terminals;

a second inductor mounted between said second pole terminal of the thyristor bridge and said second pole terminal of the diodes bridge;

a second conducting circuit means having an input terminal connected to the second terminal pole of the transistor bridge and an output terminal connected to the second DC supply terminal, said second connecting circuit comprising in series a second diode having a first diode electrode connected to the second terminal pole of the thyristor bridge and a second diode electrode, and a second storage capacitor having a first capacitor electrode connected to the second DC supply terminal and a second capacitor electrode connected to the second diode electrode of the said second diode;

a second plurality of switching aid capacitors, each comprising a first capacitor electrode connected to the second diode electrode of the second diode and a second capacitor electrode connected to the junction point of a corresponding pair of transistors of the transistor bridges;

a second low voltage-high voltage having two input terminals respectively connected to the first and second capacitor electrodes of the second storage capacitor and two output terminals respectively connected to the first and the second DC supply terminals.

4. A DC/AC inverter device according to claim 3, in which the first capacitor electrodes of the first plurality of switching aid capacitors are connected to the first pole terminal of the diode bridge and in which the first capacitor electrodes of the second plurality of switching aid capacitors are connected to the second pole terminal of the diode bridge.