Electric power conversion systems – Current conversion – Using semiconductor-type converter
Reexamination Certificate
2000-06-13
2001-04-03
Riley, Shawn (Department: 2838)
Electric power conversion systems
Current conversion
Using semiconductor-type converter
Reexamination Certificate
active
06212085
ABSTRACT:
BACKGROUND OF THE INVENTION
In a wye-connected load such as a three-phase inductance, dc brushless motor or a similar device, a rotary field is established by a set of permanent magnets, and a stationary field is established by a set of phase windings on a stator having a neutral post or point. A position-sensing device detects the appropriate stator windings via an inverter containing switching devices. Controlling the conduction of the inverter by a switching referred to as a commutation provides control of the direction of rotation of the motor. Controlling the conduction of the inverter by a switching referred to as pulse width modulation (PWM) provides control of the speed of the motor. In the operation of the motor, both commutation and pulse width modulation take place concurrently.
SUMMARY OF THE INVENTION
The present invention relates to inverter circuits to control the neutral point of a three-phase wye-connected load. In the invention a dc voltage source is connected by one pole to a pulse-width modulated (PWM) style inverter bus and by the other pole to the neutral point of an ac three-phase wye-connected load in series with an inductive impedance.
A feature of the present invention is that an inverter circuit is provided wherein the negative pole of a dc voltage source is connected to the inverter negative bus and the positive pole of the dc voltage source is connected to the neutral point of a three-phase load to control the voltage level at the neutral point of the load.
Another feature of the present invention is that an inverter circuit is provided wherein the positive pole of a dc voltage source is connected to the inverter positive bus and the negative pole of the dc voltage source is connected to the neutral point of a three-phase load to control the voltage level at the neutral point of the load.
REFERENCES:
patent: 4244017 (1981-01-01), Steigerwald
Ecostar Electric Drive Systems L.L.C.
Riley Shawn
Sparschu Mark S.
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