A control unit (17) for controlling an inverter (3) with a DC link capacitor (6), with a plurality of output phases (20) and with a plurality of switching elements (13, 14) being arranged in half bridges (10) and being connected to the DC link capacitor (6) and the output phases (20), wherein in a failure mode the control unit is configured to control the switching elements (13, 14) to adopt an active short circuit state, in which the output phases (20) are short-circuited, wherein the control unit is configured to control the switching elements (13, 14) to be transferred from the active shortcircuit state into a freewheeling state, in which the switching elements (13, 14) of one half bridge are turned off, if a first condition, according to which a voltage measuring signal (26) representing a voltage dropping over the DC link capacitor (6) is indicative that the voltage between a positive potential (11) of the DC link capacitor and a negative potential (12) of the DC link capacitor (6) is below a predefined positive voltage threshold, and a second condition, according to which a current measuring signal (28) representing a current (29) flowing between an input (8) of the inverter(3) and the switching elements (13, 14) is indicative that the current (29) in a direction from the positive potential (11) to the negative potential (12) is above or equal to a predefined current threshold being below zero, are fulfilled, and to maintain and/or adopt the active short circuit state, if the first condition is fulfilled and the second condition is not fulfilled.
一种用于控制逆变器(3)的控制单元(17),逆变器(3)具有直流链路电容器(6)、多个输出相位(20)以及设置在半桥(10)中并与直流链路电容器(6)和输出相位(20)相连接的多个开关元件(13、14),其中在故障模式下,控制单元被配置为控制开关元件(13、14)采用输出相位(20)短路的有源短路状态,其中,控制单元被配置为:如果同时满足第一条件和第二条件,控制开关元件(13、14)从有源短路状态转换为半桥的开关元件(13、14)被断开的续流状态,其中第一条件为代表直流链路电容器(6)上的压降的电压测量信号(26)指示直流链路电容器的正电位(11)和直流链路电容器(6)的负电位(12)之间的电压低于预定正电压阈值,第二条件为代表逆变器(3)的输入(8)和开关元件(13、14)之间流动的电流(29)的电流测量信号(28)指示从正电位(11)到负电位(12)的方向上的电流(29)大于或等于零以下的预定电流阈值;以及如果满足第一条件但不满足第二条件,则保持和/或采用有源短路状态。
CONTROL UNIT, INVERTER, ASSEMBLY, VEHICLE AND METHOD FOR CONTROLLING INVERTER
控制单元、逆变器、组件、车辆以及用于控制逆变器的方法
2020-05-01
Patent
Electronic Resource
Chinese
IPC: | 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 / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern |
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