Motor drive architecture with active snubber
First Claim
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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 line, the apparatus comprising:
- a power dissipating circuit arranged in parallel with said commutation circuit and configured to dissipate power on the power supply line, the power dissipating circuit having a resistive element and a first switch configured to switchably connect said resistive element to the power supply line;
a resonance detector configured to evaluate a frequency of a current on the power supply line, detect a resonance condition on said power supply line based on the evaluated frequency and provide a resonance signal representative of the resonance condition; and
a controller configured to receive the resonance signal and command said first switch at least as a function of said resonance signal.
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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.
110 Citations
14 Claims
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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 line, the apparatus comprising:
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a power dissipating circuit arranged in parallel with said commutation circuit and configured to dissipate power on the power supply line, the power dissipating circuit having a resistive element and a first switch configured to switchably connect said resistive element to the power supply line; a resonance detector configured to evaluate a frequency of a current on the power supply line, detect a resonance condition on said power supply line based on the evaluated frequency and provide a resonance signal representative of the resonance condition; and a controller configured to receive the resonance signal and command said first switch at least as a function of said resonance signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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:
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a power dissipating device arranged in parallel with said commutation circuit, and having a resistive element configured to dissipate power on the power supply connecting line when the electrical transients on the power supply connecting line 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 configured to switchably connect said power dissipating device to the power supply connecting line and to switchably connect said transient suppression device; a resonance detector configured to evaluate a frequency of a current on the power supply line, detect a resonance condition on said power supply line based on the evaluated frequency and provide a resonance signal representative of the resonance condition; and a switch controller configured to receive the resonance signal and command said switching device at least as a function of said resonance signal. - View Dependent Claims (8, 9)
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10. A method for damping electrical transients in an electrical machine having phase windings driven using a commutation circuit, the machine further having a resistive element arranged in parallel with said commutation circuit wherein the resistive element is configured to dissipate power when electrical transients are damped and 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, the method comprising:
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evaluating a resonance condition based on at least one of a frequency of a current 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 (11, 12)
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13. A method for damping electrical transients in an electrical machine having phase windings driven using a commutation circuit, the electrical machine further having a resistive element arranged in parallel with said commutation circuit, the resistive element for dissipating power when electrical transients on a power supply line are damped, the method comprising:
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evaluating a frequency of a current on the power supply line of said electrical machine; detecting a resonance condition on said power supply line based on the evaluated frequency; and switching said resistive element in to damp electrical transients on the power supply line and out at least as a function of said electrical resonance condition. - View Dependent Claims (14)
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Specification