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US 2026/0142450 A1Published application
Power electronic converter, electric motor drive and method for operating a power electronic converter
OwnerWulf-Toke Frankeinventor
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OwnerWulf-Toke Frankeinventor
Estimating the term…
The present invention pertains to a power electronic converter, such as an inverter or converter, for an electric application such as a motor drive, electrolyzer or charger. The power electronic converter includes a DC link and an active front end (AFE) connected to grid via a filter and a grid board with a first inrush relay with a resistive device. The resistive device may be a resistor, more specifically an NTC resistor or a PTC thermistor. The grid board further includes a second inrush relay, wherein at least one of the inrush relays is controlled to engage or disengage during startup phase of the power electronic converter and during abnormal grid voltage conditions, such that the DC link is charged via the resistive device or by bypassing the resistive device, and such that the AFE is provided for boosting the DC link voltage to a save level and under controlled conditions. The invention also pertains to an electric motor drive according and a method for operating a power electronic converter.
A power electronic converter, such as an inverter or converter, for an electric application such as a motor drive, an electrolyzer or a charger, comprising a DC link and an active front end (AFE) connected to a grid via a filter and a first inrush switch such as a semiconductor or a relay with a resistive device such as a resistor, an NTC resistor or a PTC thermistor and a second inrush semiconductor or relay, wherein at least one of the inrush relays is controlled to engage or disengage during a startup phase of the power electronic converter and during an abnormal grid voltage condition, such that the DC link is charged via the resistive device or by bypassing the resistive device, such that the AFE is provided for boosting the DC link voltage to a save level and under controlled conditions.
Dependencies are inferred from the claim text.