Current source sine wave inverter
First Claim
1. In an n-phase current source inverter for developing n-phase AC power from a DC source having two terminals each coupled to the inverter through a bus line and a rail associated therewith, a choke coil being connected between one of the bus lines and the associated rail, the inverter being switched between an on state in which current flows from the DC source through the inverter and a load connected thereto, and an off state, the improvement comprising:
- a switch coupled between the rail associated with the one bus line and the other bus line;
first means for sensing the current level through the choke coil when the inverter is on;
second means for sensing the current level through the load; and
means connected to the first and second sensing means and the switch for closing the switch when the inverter is off to maintain current flow through the choke coil that sufficient load current is available to supply the load when the inverter is subsequently switched on.
1 Assignment
0 Petitions
Accused Products
Abstract
An n-phase current source inverter for developing n-phase AC power from DC power generated by a DC source having first and second terminals each coupled to the inverter through first and second bus lines, respectively, including a choke coil connected between the first DC bus line and a DC rail of the inverter. A switch is coupled between the DC rail and the second bus line and means are included for sensing the current level through the choke coil when the inverter is on. Means are connected between the sensing means and the switch for closing the switch when the inverter is off or when the inverter is disconnected from the DC source to maintain the current through the choke coil at a level sufficient to provide current to the load while maintaining the voltage at the output of the inverter at a regulated level.
33 Citations
16 Claims
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1. In an n-phase current source inverter for developing n-phase AC power from a DC source having two terminals each coupled to the inverter through a bus line and a rail associated therewith, a choke coil being connected between one of the bus lines and the associated rail, the inverter being switched between an on state in which current flows from the DC source through the inverter and a load connected thereto, and an off state, the improvement comprising:
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a switch coupled between the rail associated with the one bus line and the other bus line; first means for sensing the current level through the choke coil when the inverter is on; second means for sensing the current level through the load; and means connected to the first and second sensing means and the switch for closing the switch when the inverter is off to maintain current flow through the choke coil that sufficient load current is available to supply the load when the inverter is subsequently switched on. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a three-phase current source inverter for developing three-phase AC power to energize a load connected to an inverter output from a DC source having two terminals connected to a first and second DC bus lines, the first DC bus line being coupled through a choke coil to a DC rail, the inverter being switched between on and off states, the inverter being subject to a regenerative condition during which regenerative current is developed by the load, the improvement comprising:
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means for disconnecting the choke coil from the DC rail so that the DC source is disconnected from the inverter while the inverter is off and during a regenerative condition; and means for coupling the choke coil to the second DC bus line during the regenerative condition whereby current flows through the choke coil while the inverter is off so that a source of current is available for the inverter when it is subsequently turned on and the first DC bus line is reconnected to the DC rail. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification