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US 8,008,886 B2Granted
Power converter
AssigneeDaikin Industries, Ltd.
InventorsReiji Kawashima, Yoshitsugu Koyama
Life of this patent
Estimating the term…
Abstract
A power converter is provided with a rectifying circuit, an inverter circuit, and a common mode filter including a common mode choke coil and a capacitor. The switching frequency of a PWM rectifying circuit is set at three times the switching frequency of a PWM inverter. Alternatively, the resonance frequency of the common mode filter is set at twice the carrier frequency of the rectifying circuit or the PWM inverter circuit or more.
Claims10
A power converter comprising:
- a common mode filter including a common mode choke coil and a capacitor;
- a PWM rectifying circuit having its input connected to said common mode filter, and operating at a first carrier frequency;
- and
- a PWM inverter circuit having its input connected to an output of said PWM rectifying circuit, and operating at a second carrier frequency, a relation between said first and said second carrier frequencies set so that said common mode choke coil does not bring about magnetic saturation.
1 more element
A power converter comprising:
- a common mode filter including a common mode choke coil and a capacitor;
- a rectifying circuit having its input connected to said common mode filter;
- and
- a PWM inverter circuit having its input connected to an output of said rectifying circuit, and operating at a carrier frequency of not more than half of a resonance frequency of said common mode filter.
1 more element
A power converter comprising:
- a common mode filter including a common mode choke coil and a capacitor;
- a rectifying circuit having its input connected to said common mode filter, and operating at a carrier frequency of not more than half of a resonance frequency of said common mode filter;
- and
- a PWM inverter circuit having its input connected to an output of said rectifying circuit.
1 more element
A power converter comprising:
- a common mode filter including a common mode choke coil and a capacitor;
- a PWM rectifying circuit having its input connect to said common mode filter, and operating at a first carrier frequency;
- and
- a PWM inverter circuit having its input connected to an output of said PWM rectifying circuit, and operating at a second carrier frequency, a carrier frequency of said PWM rectifying circuit set at an odd-multiple being more than three of a carrier frequency of said PWM inverter circuit, and a common mode voltage generated by said PWM rectifying circuit and a common mode voltage generated by said PWM inverter circuit set at the same phase to each other.
1 more element
Dependencies are inferred from the claim text.