Motor Drive Architecture with Active Snubber
First Claim
Patent Images
1. An active electrical protection apparatus for damping electrical transients in a control circuit of an electrical machine having phase windings driven using a commutation circuit and powered through a power supply connection, the apparatus comprising:
- a power dissipating circuit arranged in parallel with said commutation circuit, and having a resistive element for dissipating power when electrical transients are damped and a first switch for switchably connecting said resistive element; and
a controller for receiving a resonance signal representative of a resonance condition on said power supply connection, and for commanding said first switch at least as a function of said resonance signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus is disclosed for controlling a system comprising at least one electric motor. The motor drive circuit includes a reconfigurable active snubber. Under given resonance conditions, the active snubber is configured to use a resistive element to dissipate electrical transients across the commutation circuit.
-
Citations
16 Claims
-
1. An active electrical protection apparatus for damping electrical transients in a control circuit of an electrical machine having phase windings driven using a commutation circuit and powered through a power supply connection, the apparatus comprising:
-
a power dissipating circuit arranged in parallel with said commutation circuit, and having a resistive element for dissipating power when electrical transients are damped and a first switch for switchably connecting said resistive element; and a controller for receiving a resonance signal representative of a resonance condition on said power supply connection, and for commanding said first switch at least as a function of said resonance signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An active electrical protection apparatus for damping electrical transients in an electrical machine having phase windings driven using a commutation circuit and powered through a power supply connecting line, the apparatus comprising:
-
a power dissipating device arranged in parallel with said commutation circuit, and having a resistive element for dissipating power when electrical transients are damped; a transient suppression device arranged in series with said power dissipating circuit and with said commutation circuit, and having a feedback diode device arranged inversely relative to a drive current of said commutation circuit; a switching device for switchably connecting said power dissipating device and for switchably connecting said transient suppression device; and a switch controller for receiving a resonance signal representative of a resonance condition on said power supply connecting line, and for commanding said switching device at least as a function of said resonance signal. - View Dependent Claims (9, 10, 11)
-
-
12. A method for damping electrical transients in an electrical machine having phase windings driven using a commutation circuit, the method comprising:
-
providing a resistive element arranged in parallel with said commutation circuit, the resistive element for dissipating power when electrical transients are damped; providing a feedback diode device arranged in series with said power dissipating circuit and with said commutation circuit, and arranged inversely relative to a drive current of said commutation circuit; evaluating a resonance condition based on at least one of a noise level on a power supply line and an operation frequency of said electrical machine; switching said feedback diode device in and out as a function of said resonance condition; measuring a voltage across said commutation circuit; comparing a value of said voltage to a limit voltage value to detect a voltage transient which determines a voltage condition; and switching said resistive element in and out as a function of said resonance condition and said voltage condition. - View Dependent Claims (13, 14)
-
-
15. A method for damping electrical transients in an electrical machine having phase windings driven using a commutation circuit, the method comprising:
-
providing a resistive element arranged in parallel with said commutation circuit, the resistive element for dissipating power when electrical transients are damped; evaluating an electrical resonance condition of a power supply line of said electrical machine; and switching said resistive element in and out as at least as a function of said electrical resonance condition. - View Dependent Claims (16)
-
Specification