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AssigneesDanfoss Power Electronics A/S, Indian Institute of Technology Madras
InventorsSeshadri Gopalan, Dinesh Kumar, Krishna Vasudevan
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The invention discloses systems (100) and methods (200, 300) for reducing the effect of even-order harmonics in supply voltage on the DC side components in AC-DC converters having any kind of controlled power electronic switches or their combinations. The method involves modifying the time of firing the various switches (112, 114) through a control logic arrives at through either measuring or estimating the DC bus voltage or the input AC voltage. The proposed control methods are useful in ASDs where full bridge configuration is used for AC to DC conversion. The proposed control may also be used in ASDs where a half bridge rectifier system is used. The proposed method reduces the stress on the DC bus capacitor and increases the lifetime of the capacitor. It further reduces the peak current through the device, which reduces stress on the rectifier components. It also reduces the Total Harmonic Distortion (THDi) of the line current.
A control method of operating a controlled bridge rectifier in a system with an input controlled bridge rectifier circuit with upper leg semiconductor switches and lower leg semiconductor switches, a DC bus capacitor, and one or more controllers, the method comprising:
A control method of operating a controlled bridge rectifier in a system with an input controlled bridge rectifier circuit with upper leg semiconductor switches and lower leg semiconductor switches, a DC bus capacitor, and one or more controllers, the method comprising:
A control method of operating a controlled bridge rectifier in a system with an input controlled bridge rectifier circuit with upper leg semiconductor switches and lower leg semiconductor switches, a DC bus capacitor, and one or more controllers, the method comprising:
Dependencies are inferred from the claim text.