Test-bench container for long-term tests of power semiconductors and control circuits

需要一个用于测量中压功率半导体的永久性试验站容器。研究设备是一个集装箱内的长期试验站，使工作组一方面可以进行特性测量，另一方面可以进行中压耐久性试验。可以产生高达4kV的标称电压和高达2kA的标称电流，这代表了正在研究的组件的各种负载。从而可以检测功率半导体及其驱动电路的性能。通过带有控制计算机的测量卡系统对各种测量参数进行连续监测，允许全天候操作。此外，特殊的安全架构，它配备了几个层次，导致最安全的连续操作。作为一个独立的测试站容器的设计允许扩展实验室的能力，并减少在最坏的情况下对容器的故障影响。要在中压范围内进行连续测试，至少需要四个功率半导体，它们通过两个半桥连接到直流链路转换器。电感或感容负载连接到负载输出，以便通过调制功率半导体产生交流电。由于感性负载的存在，大部分功率都是无功功率，所以只有损耗才需要输入。因此，一个兆瓦变流器可以用相当低的馈入功率运行，只有几10kW。主要的损耗是功率半导体的开关和传导损耗以及负载电感的损耗。除了电源之外，还需要具有规定的电源温度和流量的水冷却系统，以规定的方式冷却功率半导体。恒定的水冷却确保了散热器的恒定热阻，这对于测试对象的热特性至关重要。只有这样才能声明模块的老化情况。这个长期测试容器使工作组能够表征功率半导体及其在耐久性测试中的控制，并确定其使用寿命。从单次开关试验到连续运行的过渡是非常有用的，这样可以在现场测试之前发现研究结果可能存在的弱点。测试站容器允许封闭系统具有非常好的监测能力。

A permanent test station container for measurements on medium-voltage power semiconductors is requested. The research equipment, a long-term test station in a container, enables the working group to carry out characterization measurements on the one hand and medium-voltage endurance tests on the other hand. Nominal voltages of up to 4kV and nominal currents of up to 2kA can be generated, which represent various loads for the components under investigation. So that the behavior of the power semiconductors and their drive circuit can be examined. Continuous monitoring of various measurement parameters by means of a system of measurement cards with a control computer allows round-the-clock operation. Also, the special safety architecture, which is equipped with several levels, leads to the safest possible continuous operation. A design as a separate test station container allows an extension of the laboratory capacities and reduces in the worst case the fault effect on the container.To perform a continuous test in the medium voltage range, at least four power semiconductors are required, which are connected to a DC link converter with two half bridges. An inductive or inductive-capacitive load is connected to the load output so that an alternating current can be generated by modulating the power semiconductors. Due to the inductive load, most of the power is reactive power, so that only the losses have to be fed in. Thus, a megawatt converter can be operated with quite low feed-in power of a few 10kW. The main losses are switching and conduction losses of the power semiconductors and the losses of the load inductance. In addition to the power supply, a water cooling system with defined supply temperatures and flow rates is required to cool the power semiconductors in a defined manner. A constant water cooling ensures a constant thermal resistance of the heat sink, which is crucial for the thermal characterization of the test object. Only in this way can statements be made about the aging of the module. This long-term test container enables the working group to characterize power semiconductors and their control in endurance tests and to determine their lifetime. The transition from single switching tests to continuous operation is very useful, so that possible weak points of research results can be found before testing in the field. A test station container allows a closed system with very good monitoring capability.