15 November 2017
Power Electronics / Power Management
The devices in the EA-EL 9000 B series offer power of 400 W, voltage of 90 V up to 500 V and current up to 60 A. In comparison to Elektro-Automatik’s previous EL 3000 series, the EL 3000 B loads have been technically further developed: accuracy, stability and an isolated construction between the service and performance parts characterise the new loads. In addition, the HMI is equipped with a 5,2” TFT display. The menu is clearly set out, easy to use and multilingual. Additional features such as a function generator simplify working with the electronic loads.
A battery test and MPP tracking function are also integral. During battery testing various parameters such as discharge mode, time or cut out criteria can be specified. In addition, user profiles can be saved and loaded such that parameters for repeat applications can be stored and readily retrieved. The EL 3000 B loads are particularly suited for testing power supplies, DC-DC converters, batteries, fuel cells and solar panels.
Digital measurement and control is based on a 14-bit AD/DA converter. Parallel processing of the digital signals enables a control loop span - measure, calculate, set – of less than 4 µs. Thus current, voltage, power and resistance can be concurrently measured with a bandwidth greater than 250 kHz. The DC input circuit of the load contains an active electronic damping. In this way, high current stability is guaranteed and undesirable oscillations are avoided.
All devices are equipped as standard with a plug-and-play slot and can be enhanced with interfaces such as USB, Ethernet or analog interfaces. All interfaces as well as the operating panel on the front of the unit are galvanically separated from the input.
Analysis of switch-mode power supply: inductor violations Altron Arrow
Editor's Choice Power Electronics / Power Management
Common switch-mode power supply (SMPS) design errors are discussed, and their appropriate rectification is specified, with details on complications that arise with the power stage design of DC-DC switching regulators.
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