摘要:
A galvanically isolated DC/DC converter (2) comprises at least one first side converter circuit (20) coupled between a pair of first side DC terminals (10), the first side converter circuit (20) having at least a first and a second switching element (20a, 20b), with each of the first and second switching elements (20a, 20b) comprising a switch (22, 24) and a diode (23, 25) connected in parallel, and at least one second side converter circuit (40) coupled between a pair of second side DC terminals (60), wherein, when the DC/DC converter (2) is in power transfer operation from the pair of second side DC terminals (60) to the pair of first side DC terminals (10), the second side converter circuit (40) is adapted to alternate between two power transfer states, wherein a conductive state of the diode of one of the first and second switching elements (20a, 20b) is the result of one of the two power transfer states, with the first side converter circuit (20) being controlled such that the switch of the respectively other of the first and second switching elements (20a, 20b) is closed for an adaptation interval (T P ) prior to a beginning of the one of the two power transfer states.
摘要:
A method of controlling a DC/AC converter (2) comprises the steps of (a) providing a desired AC side reference value (VAmp); (b) setting a reference correction value (VAmp,corr,1); (c) calculating an AC side reference signal (VAC,set,1) as a function of the desired AC side reference value (VAmp) and the reference correction value (VAmp,corr,1); (d) obtaining an actual AC side signal (VAC,Act,1); and (e) calculating a converter control signal (MAC,1) as a function of the AC side reference signal (VAC,Set,1) and the actual AC side signal (VAC,Act,1); wherein the setting of the reference correction value (VAmp,corr,1) is based on a relation of the desired AC side reference value (VAmp) and the actual AC side signal (VAC,Act,1).
摘要:
A galvanically isolated DC/DC converter (2) comprises at least one first side converter circuit (20) coupled between a pair of first side DC terminals (10), and at least one second side converter circuit (40) coupled between a pair of second side DC terminals (60), the second side converter circuit having at least a first and a second switching element (41, 45), with each of the first and second switching elements (41, 45) comprising a switch (42, 46) and a diode (44, 48) connected in parallel, wherein, when the DC/DC converter (2) is in power transfer operation from the pair of first side DC terminals (10) to the pair of second side DC terminals (60), the diodes (44, 48) of the first and second switching elements (41, 45) are alternately in a conductive state, with each of the first and second switching elements being controlled such that a closed state of the respective switch extends beyond a transitioning of the diode of the same switching element from the conductive state to a blocking state.
摘要:
A DC/AC converter includes a DC/DC conversion stage with galvanic isolation and a DC/AC conversion stage, wherein the DC/DC conversion stage comprises a pair of first side terminals providing or receiving a first DC voltage, a pair of second side terminals providing or receiving a second DC voltage and coupled to the DC/AC conversion stage, at least one first side converter circuit coupled between the pair of first side terminals, a series connection of a plurality of second side converter circuits coupled between the pair of second side terminals, and at least one transformer circuit coupling the plurality of second side converter circuits to the at least one first side converter circuit, wherein a connection point between two of the plurality of second side converter circuits is coupled to the DC/AC conversion stage and forms a neutral phase point thereof.
摘要:
A method for controlling a synchronous electric machine (2) comprising a stator and a rotor encompasses the following steps: the machine (2) is operated at a deceleration moment (MP) such that a rotor speed of the machine is reduced; the rotor movement of the machine is monitored, and when a rotation in the opposite direction or a rotor speed (v) of nearly zero with a transition into a blocked mode is detected, at least one electric input variable (I; iu, iv, iw) of an electric stator system of the machine is adjusted in such a way that an effective internal moment (MB) of the machine is generated at the beginning of the blocked mode, said internal moment (MB) being smaller than the deceleration moment (MP). The electric input variable (I; iu, iv, iw) is adjusted in this way until a stable equilibrium between an external moment (MA) affecting the machine and the internal moment (MB) has been reached by moving the rotor and under the influence of said external moment (MA).