The invention relates to a bridge rectifier, which comprises a number of alternating-voltage connections (u), two direct-voltage connections (B+, B-), and a number of half bridges that corresponds to the number of alternating-voltage connections (u). Each half bridge has two controllable switching elements (S1, S4) connected in series between the two direct-voltage connections (B+, B-), between which two switching elements one of the alternating-voltage connections (u) is connected. Each half bridge also comprises a control circuit (4U), which is designed to detect an output voltage present between the two direct-voltage connections (B+, B-) and to switch a first switching element (S1, S4) of the two switching elements of the respective half bridge to the conductive state by controlling the first switching element by means of a first control signal until the output voltage falls below a lower threshold value after the output voltage has previously exceeded an upper threshold value, and to control the first switching element in a clocked manner by controlling the first switching element by means of a second control signal until the output voltage exceeds the upper threshold value after the output voltage has previously fallen below the lower threshold value. According to the invention each control circuit (4U) has threshold value elements (A2), which are designed to effect a change in the lower and/or upper threshold value after the output voltage has previously exceeded the upper threshold value. The invention further relates to an associated operating method and to means for implementing said operating method.
Overvoltage protection for active rectifiers in the event of load shedding
2016-02-24
Patent
Electronic Resource
English
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen |
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