Method for controlling drive pulses of DAB type bidirectional isolation DC-DC converter
A DC-DC, driving pulse technology, applied in the direction of conversion equipment with intermediate conversion to AC, can solve the problems of reduced system reliability, increased stress of related devices, and increased system electromagnetic interference, so as to reduce system reactive power. power, reduce device stress, and reduce system losses
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[0030]First, introduce the working principle of this control method, as shown in Figure 3, the working principle of the driving pulse. The NSPS control method causes the phase shift of the diagonal switch tubes of the full bridge on one side by driving pulses, thereby outputting a three-level voltage waveform, while the full bridge on the other side does not need any phase shift control. Therefore, the NSPS control method includes two control modes, namely Mode 1 (Mode 1): phase shifting in the B1 bridge and no phase shifting in the B2 bridge; Mode 2 (Mode 2): phase shifting in the B2 bridge and no phase shifting in the B1 bridge.
[0031] In the control mode of Mode1, if the power flow direction is determined by U 1 to U 2 flow to figure 1 Medium Q 4 tube drive pulse as reference, control B 1 The diagonal switch Q of the bridge 1 ahead of Q 4 tube time t conduction, while B 2 Bridge switch tube S 1 and S 4 The driving pulses are with B 1 the Q 4 tube synchronously,...
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