Methods and systems for reducing conducted electromagnetic interference
First Claim
1. An electromagnetic interference (EMI) filter system for a twin motor system that includes a first drive circuit having a first direct current (DC) link with a capacitor having a capacitance less than 10 μ
- F and a first inverter for driving a first motor, and a second drive circuit having a second DC link coupled to the first DC link and including a capacitor having a capacitance between about 200 μ
F and 1000 μ
F and a second inverter for driving a second motor;
said EMI filter system comprising;
a line-side filter configured to filter input power for transmission to the first DC link and the second DC link, said line-side filter comprising;
an input comprising a first input terminal and a second input terminal;
an output comprising a first output terminal and a second output terminal, wherein a first conductive path is defined between the first input terminal and the first output terminal, and a second conductive path is defined between the second input terminal and the second output terminal;
a first choke device coupled across the first and second conductive paths;
a first Y capacitor including a first end and a second end opposite the first end, the first end coupled to the first conductive path downstream from said first choke device; and
a second Y capacitor including a first end and a second end opposite the first end, the first end coupled to the second conductive path downstream from said first choke device; and
a load-side filter comprising a second choke device coupled between the second inverter and the second motor.
1 Assignment
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Accused Products
Abstract
An EMI filter is described that includes an input having first and second input terminals, and an output having first and second output terminals. A first conductive path is defined between the first input and output terminals, and a second conductive path is defined between the second input and output terminals. The EMI filter also includes a first choke device coupled across the first and second conductive paths, and a first Y capacitor including a first end and a second end opposite the first end, the first end coupled to the first conductive path downstream from the first choke device. The EMI filter further includes a second Y capacitor including a first end and a second end opposite the first end, the first end coupled to the second conductive path downstream from the first choke device, and a second choke device coupled to an inverter output.
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Citations
20 Claims
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1. An electromagnetic interference (EMI) filter system for a twin motor system that includes a first drive circuit having a first direct current (DC) link with a capacitor having a capacitance less than 10 μ
- F and a first inverter for driving a first motor, and a second drive circuit having a second DC link coupled to the first DC link and including a capacitor having a capacitance between about 200 μ
F and 1000 μ
F and a second inverter for driving a second motor;
said EMI filter system comprising;a line-side filter configured to filter input power for transmission to the first DC link and the second DC link, said line-side filter comprising; an input comprising a first input terminal and a second input terminal; an output comprising a first output terminal and a second output terminal, wherein a first conductive path is defined between the first input terminal and the first output terminal, and a second conductive path is defined between the second input terminal and the second output terminal; a first choke device coupled across the first and second conductive paths; a first Y capacitor including a first end and a second end opposite the first end, the first end coupled to the first conductive path downstream from said first choke device; and a second Y capacitor including a first end and a second end opposite the first end, the first end coupled to the second conductive path downstream from said first choke device; and a load-side filter comprising a second choke device coupled between the second inverter and the second motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- F and a first inverter for driving a first motor, and a second drive circuit having a second DC link coupled to the first DC link and including a capacitor having a capacitance between about 200 μ
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10. An electric motor drive circuit configured to drive a first electric motor and a second electric motor, said electric motor drive circuit comprising:
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a rectifier configured to convert an AC input voltage to a pulsed DC voltage; a first DC link electrically coupled to said rectifier, said first DC-link comprising a low-capacitance capacitor having a capacitance less than 10 μ
F;a first inverter coupled to said first DC-link, said first inverter configured to generate a conditioned output voltage to drive the first electric motor; a second DC-link electrically coupled to said first DC-link; a second inverter coupled to said second DC-link, said second inverter configured to generate a conditioned output voltage to drive the second electric motor; and an electromagnetic interference (EMI) filter system comprising; a line-side filter configured to filter input power for transmission to said rectifier, said line-side filter comprising; an input comprising a first input terminal and a second input terminal; an output coupled to an input of said rectifier, said output comprising a first output terminal and a second output terminal, wherein a first conductive path is defined between the first input terminal and the first output terminal, and a second conductive path is defined between the second input terminal and the second output terminal; a first choke device coupled across the first and second conductive paths; a first Y capacitor including a first end and a second end opposite the first end, the first end coupled to the first conductive path downstream from said first choke device; and a second Y capacitor including a first end and a second end opposite the first end, the first end coupled to the second conductive path downstream from said first choke device; and a load-side filter comprising a second choke device coupled between said second inverter and the second electric motor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An electric motor system comprising:
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a first electric motor including a first electric motor drive circuit having a first direct current (DC) link with a capacitor having a capacitance less than 10 μ
F and a first inverter configured to drive said first electric motor;a second electric motor including a second electric motor drive circuit having a second DC link coupled to the first DC link and including a capacitor having a capacitance between about 200 μ
F and 1000 μ
F and a second inverter configured to drive said second electric motor; anda common electric motor drive circuit configured to condition power provided to the first and second electric motor drive circuits, said common electric motor drive circuit comprising; an electromagnetic interference (EMI) filter system comprising; a line-side filter configured to filter input power for transmission to said common electric motor drive circuit, said line-side filter comprising; an input comprising a first input terminal and a second input terminal; an output comprising a first output terminal and a second output terminal, wherein a first conductive path is defined between the first input terminal and the first output terminal, and a second conductive path is defined between the second input terminal and the second output terminal; a first choke device coupled across the first and second conductive paths; a first Y capacitor including a first end and a second end opposite the first end, the first end coupled to the first conductive path downstream from said first choke device; and a second Y capacitor including a first end and a second end opposite the first end, the first end coupled to the second conductive path downstream from said first choke device; and a load-side filter comprising a second choke device coupled between the second electric motor drive circuit and the second electric motor. - View Dependent Claims (20)
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Specification