METHOD AND SYSTEM OF REDUCING TURN-OFF LOSS AND NOISE IN A SWITCHED RELUCTANCE MOTOR DRIVE
First Claim
1. An inverter for use with an electric motor, comprising:
- a first transistor having a first node for connecting to a power supply and a second node for connecting to a phase winding;
a second transistor having a first node for connecting to the power supply and a second node for connecting to the phase winding;
a first diode having a first node and a second node connected to the second node of the first transistor;
a capacitor connected between the first node of the first diode and the second node of the second transistor;
a second diode having a first node and a second node connected to the first node of the first diode; and
an inductor connected to the first node of the second diode.
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Accused Products
Abstract
An inverter for use in a switched reluctance (SR) motor drive is provided. The inverter comprises a first and second transistor for selectively providing current to an SR motor winding. A resonant-type snubber circuit is connected to the transistors to reduce turn-off loss. The snubber circuit includes a pair of diodes, a capacitor, and an inductor. The snubber circuit is reset during switch-on time of the transistors. At transistor turn-off time, the snubber circuit uses the capacitor to effectively limit the rate of change of voltage across the transistors. This allows the transistors to turn off with lower losses, and can also reduce the acoustical noise generated by the motor drive.
8 Citations
8 Claims
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1. An inverter for use with an electric motor, comprising:
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a first transistor having a first node for connecting to a power supply and a second node for connecting to a phase winding;
a second transistor having a first node for connecting to the power supply and a second node for connecting to the phase winding;
a first diode having a first node and a second node connected to the second node of the first transistor;
a capacitor connected between the first node of the first diode and the second node of the second transistor;
a second diode having a first node and a second node connected to the first node of the first diode; and
an inductor connected to the first node of the second diode. - View Dependent Claims (2, 3, 4)
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5. A method of reducing turn-off loss in a switched reluctance motor drive, comprising:
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providing a switched reluctance inverter including at least one insulated gate bipolar transistor and a capacitor operatively coupled to the at least one insulated gate bipolar transistor;
charging the capacitor while the at least one insulated gate bipolar transistor is turned on;
turning off the at least one insulated gate bipolar transistor; and
limiting a rate of change of the voltage across the at least one insulated gate bipolar transistor according to the capacitance value of the capacitor. - View Dependent Claims (6)
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7. A method of reducing acoustic and switching noise in a switched reluctance motor drive, comprising:
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providing a soft-commutation switched reluctance inverter including at least one insulated gate bipolar transistor and a capacitor operatively coupled to the at least one insulated gate bipolar transistor;
charging the capacitor while the at least one insulated gate bipolar transistor is turned on;
turning off the at least one insulated gate bipolar transistor; and
limiting a rate of change of the voltage across the at least one insulated gate bipolar transistor according to the capacitance value of the capacitor. - View Dependent Claims (8)
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Specification