Microprocessor device for the diagnosis of capacitors DC link bus of frequency converters.
Journal Title: Наукові праці Донецького Національного Технічного Університету серія: Електротехніка і Енергетика - Year 2015, Vol 1, Issue 1
Abstract
The paper presents a theoretical and applied aspects of implementation diagnosing microprocessor for filtering electrolytic capacitor DC link frequency converters The synthesis of hardware and software necessary to build a system of diagnostic filter capacitor frequency converters, which allows to identify the critical operating state of the capacitor and to prevent damage of the frequency converter. The proposed model is based on the calculation of the actual values of the lifetime factor, which binds the actual capacitor’s lifetime with its nominal value. Calculation of lifetime factor involves the measurement of the voltage on the capacitor plates, ripple current and temperature of the capacitor. The diagnostic conclusion generated by the system taking into account the duration of the lifetime factor overrange due to the input of time delay and compare the results of calculation of the lifetime factor at the beginning and at the end of the delay interval, as well as consideri ng the sign of the derivative of the factor in time to avoid erroneous conclusions with short -term perturbations. Diagnostic device based on microcontroller Atmega8A, as the voltage sensor uses a compensation voltage sensor L25-P, current signal formed at the output capacitor current sensor ACS712. These sensors operate on the Hall effect, which provides galvanic isolation range of information and power circles. Тemperature sensor 700-101BAA-B00 is installed directly on the capacitor. Communication capacitors diagnostics microprocessor devise with central controller of inverter control is carried out on a standard protocol TWI. To change the constants and initial values of operating parameters device has a socket for In-System Programming. Proposed algorithm and software implementation microprocessor devise for easily integrated into the overall system diagnostics elements frequency converters.
Authors and Affiliations
S. LEVYTSKYI, D. PROTSENKO, A. BARTETSKYI
Keywords
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- EP ID EP660934
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