23-01-2020 дата публикации
Номер: US20200023741A1
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The invention relates to the diagnosis of the switching elements in a bidirectional DC-to-DC voltage converter. By charging a capacitor in the DC-to-DC voltage converter and then specifically actuating the switching elements and evaluating the voltage in the charged capacitor of the DC-to-DC converter, it is possible to identify a faulty switching element. 11110220111121234. A diagnostic method for a bidirectional DC-to-DC voltage converter that comprises a first capacitor (C) and a first full bridge () at a first DC voltage terminal () and that comprises a second full bridge () at a second DC voltage terminal () , wherein the first full bridge () comprises two half bridges ( , ) each having a first switching element (M , M) and a second switching element (M , M) , comprising the steps of:{'b': 1', '10, 'providing (S) a first DC voltage at the second DC voltage terminal () of the DC-to-DC voltage converter;'}{'b': 2', '1', '2', '3', '4', '1, 'opening (S) the first switching elements (M, M) and the second switching elements (M, M) in the first full bridge ();'}{'b': 3', '1', '2, 'charging (S) the first capacitor (C) to a predetermined first test voltage by driving the second full bridge ();'}{'b': 4', '1', '2', '1, 'closing (S) a first switching element (M, M) in the first full bridge ();'}{'b': 5', '3', '4', '1', '1', '2, 'detecting (S) a faulty second switching element (M, M) if the electric voltage across the first capacitor (C) drops by more than a predefined first voltage value within a predetermined first time interval following the closure of the first switching element (M, M);'}{'b': 6', '1', '2', '1, 'opening (S) the closed first switching element (M, M) in the first full bridge ();'}{'b': 7', '3', '4', '1, 'closing (S) a second switching element (M, M) in the first full bridge (); and'}{'b': 8', '1', '2', '1', '3', '4, 'detecting (S) a faulty first switching element (M, M) if the electric voltage across the first capacitor (C) drops by more than a ...
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