METHOD FOR FORMING A CAPACITOR MODULE CIRCUIT IN AN INVERTER USING IMPEDANCE MATCHING
First Claim
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1. A method for forming a capacitor module circuit including a Y-capacitor to suppress switching noise in an inverter for driving a drive motor of an electric vehicle, the method comprising the steps of:
- (a) forming a capacitor module by predetermining the capacitance of the Y-capacitor and measuring actual voltage or current waveforms from the Y-capacitor;
(b) extracting and separating independent and detailed frequency components by filtering the voltage or current waveforms with respect to frequency bands and forming a parallel equivalent circuit including an impedance resistor, an inductor, and a capacitor at each of the separated frequency components;
(c) determining a value of each element by comparing simulation waveforms obtained by sequentially changing the value of each element (resistance, inductance, and capacitance) in the parallel equivalent circuit with the actually measured voltage or current waveforms; and
(d) forming an actual capacitor module using the Y-capacitor having the determined capacitance when a parallel impedance equivalent circuit including the elements having the determined values is finally completed.
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Abstract
The present invention is directed to methods for forming an inverter circuit for operating a drive motor of an electric vehicle, which can more effectively reduce the switching noise generated by a power module during the operation of an inverter.
36 Citations
9 Claims
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1. A method for forming a capacitor module circuit including a Y-capacitor to suppress switching noise in an inverter for driving a drive motor of an electric vehicle, the method comprising the steps of:
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(a) forming a capacitor module by predetermining the capacitance of the Y-capacitor and measuring actual voltage or current waveforms from the Y-capacitor; (b) extracting and separating independent and detailed frequency components by filtering the voltage or current waveforms with respect to frequency bands and forming a parallel equivalent circuit including an impedance resistor, an inductor, and a capacitor at each of the separated frequency components; (c) determining a value of each element by comparing simulation waveforms obtained by sequentially changing the value of each element (resistance, inductance, and capacitance) in the parallel equivalent circuit with the actually measured voltage or current waveforms; and (d) forming an actual capacitor module using the Y-capacitor having the determined capacitance when a parallel impedance equivalent circuit including the elements having the determined values is finally completed. - View Dependent Claims (2, 3, 4)
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5. A method for forming a capacitor module circuit including a Y-capacitor to suppress switching noise in an inverter for driving a drive motor of an electric vehicle, the method comprising the steps of:
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(a) forming a capacitor module; (b) extracting and separating independent and detailed frequency components; (c) determining a value of each element; and (d) forming an actual capacitor module. - View Dependent Claims (6, 7, 8, 9)
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