Control method and device of DC/DC converter

Abstract

The invention provides a control method and device for a DC / DC converter. The method comprises: the switching frequencies of a sixth signal, a fifth signal, a seventh signal and an eighth signal are half of the switching frequencies of the driving signals of primary switch tubes, the phase difference between adjacent signals of the sixth signal, the fifth signal, the seventh signal and the eighthsignal is a preset angle, and the phase difference between the sixth signal and the driving signal of the first switch tube is a phase shift angle; the sixth signal, the fifth signal, the seventh signal and the eighth signal are used as driving signals to drive the sixth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube, respectively; alternatively, the sixth signal, the fifth signal, the seventh signal, and the eighth signal are used as intermediate signals, and the driving signals of the secondary switch tubes are generated according to the driving signalof the at least one primary switch tube and the intermediate signal, and the driving signals of the secondary switch tubes drive the switch tubes corresponding to the secondary side, thereby realizing thermal equalization among the secondary switch tubes.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of energy storage, and in particular to a control method and device for a DC / DC converter. Background technique [0002] With the rapid development of new energy and electric vehicle technology, bidirectional DC / DC converters that can realize power bidirectional flow function are more and more widely used in new energy, battery energy storage and other fields. An excellent bidirectional DC / DC converter control method is of great significance to promote the application of new energy and alleviate the energy crisis. [0003] figure 1 It is a schematic diagram of the circuit structure of a resonant bidirectional DC / DC converter, such as figure 1 As shown, the resonant bidirectional DC / DC converter is a typical bidirectional DC / DC converter. In the prior art, a control method of phase shifting and frequency conversion is used to control the resonant bidirectional DC / DC converter. In the...

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Problems solved by technology

[0005] The embodiment of the present invention provides a control method and device for a DC / DC converter, which solves the problem that the effective current of S6 / S8 will be very large due to the phase-shift control method used in the prior art to control the DC / DC converter. There is a large temperature difference between S6 / S8 and S5 / S7, which causes the technical problem of thermal imbalance between the switch tubes on the secondary side

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