Hubert Schierling
49Patents
9h-index
47Co-inventors
75Inventor score
Filing activity: Jan 9, 1989 → Sep 29, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6850424B2 | Inverter with a line-side and load-side freewheeling pulse converter using SiC switching elements | Emerging Cross-Sectional Technologies | 42 | Expired |
| US6603647B2 | Method for controlling freewheeling paths in a matrix converter | Electricity | 22 | Expired |
| US4884023A | Method and apparatus for determining the rotor resistance of a rotating-field machine | Electricity | 16 | Expired |
| US7327053B2 | Electronic power circuit | Electricity | 16 | Expired |
| US5635811A | Method and apparatus for standstill recognition when restarting a power converter-fed AC motor without a tachometer generator | Electricity | 12 | Expired |
| US7394627B2 | Frequency converter having an intermediate circuit without any capacitors | Electricity | 10 | Active |
| US7652585B2 | Method and device for detecting a degree of pollution of an operational converter | Electricity | 10 | Active |
| US6760239B2 | Method for controlling a matrix converter | Electricity | 10 | Expired |
| US5467000A | Method and apparatus for current regulating in a voltage-injecting converter | Electricity | 9 | Expired |
| US6862163B2 | Method and device for bridging brief power outages in a matrix converter | Electricity | 9 | Expired |
| US7529111B2 | Drive controller for a self-commutated converter | Electricity | 7 | Active |
| US8873207B2 | Method for operating a ground fault interrupter as well as ground fault interrupter for a frequency converter | Electricity | 6 | Active |
| US7622886B2 | Method for determination of the risk to disturbance-free operation of a frequency converter | Electricity | 6 | Active |
| US7301736B2 | Method and device for shutting down a drive with a matrix converter during a power outage | Electricity | 6 | Expired |
| US7997905B2 | Machine tool or production machine or robot | Electricity | 5 | Active |
| US7825533B2 | Transmission system for interchanging information data between an electrical load and an upstream converter | Electricity | 5 | Active |
| US6914397B2 | Reduction of interference currents in a group of synchronized, variable speed electric drives | Electricity | 5 | Expired |
| US7489124B2 | Process for determining the loading condition of a diode rectifier of a frequency converter | Electricity | 5 | Expired |
| US9007790B2 | Frequency converter and method for identifying and blocking a fault current in a frequency converter | Electricity | 4 | Active |
| US9146166B2 | Method and apparatus for determining an electrical torque of an electrical machine | Electricity | 3 | Active |
| US9318969B2 | Frequency converter with DC link capacitor and method for pre-charging the DC link capacitor | Electricity | 3 | Active |
| US11075623B2 | Method for controlling a direct current switch, direct current switch, and DC voltage system | Electricity | 2 | Active |
| US8743572B2 | Lossy triphase low-pass filter | Electricity | 2 | Active |
| US11362512B2 | Electronic switch with overvoltage limiter | Electricity | 2 | Active |
| US11437807B2 | Electronic switch | Electricity | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.