Dual active bridge inductance range determination method suitable for single phase shift control

Abstract

The invention discloses a dual active bridge inductance range determination method suitable for single phase shift control. The method considers the constraint that the maximum output power of the circuit should be greater than a given output power index requirement, and also considers the constraint that a power device in the circuit should realize a zero-voltage switching requirement. Meanwhile, detailed discussion is conducted on the requirement for the direction of a characteristic current value, the requirement for inductance energy meeting primary side commutation and the requirement for matching of dead zone time and an inductance value, the minimum value of the inductance value range is obtained, the zero-voltage switching performance of a power device in the DAB circuit is guaranteed, and the working reliability of the power device and even the whole device is improved. And meanwhile, the power device does not generate switching loss, so that the loss of the whole circuit is reduced, and the working efficiency of the DAB device is improved. Experiments prove that the inductance range determination method provided by the invention is comprehensive in consideration and clear in process, ensures the reliability of normal work of the dual-active bridge circuit, and has relatively high practical value.

Description

technical field [0001] The invention belongs to the field of manufacture of transformers, rectifiers and inductors, in particular to a method for determining the inductance range of a dual active bridge suitable for single phase shift control. Background technique [0002] Because of its advantages of high efficiency, high reliability, control, and low cost, medium-voltage direct current transmission technology is more and more widely used in power transmission. Generally, the power that a topology can transmit is proportional to the number of power semiconductors it contains, so in several commonly used topologies, Dual Active Bridge (DAB) is very suitable for high-power applications as a DC converter to use. In addition, compared with other resonant converters, DAB is easier to achieve zero voltage switching (Zero Voltage Switching, ZVS), and the bidirectional conversion speed is faster, so DAB is widely used in medium-voltage high-power transmission applications. [000...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for determining the inductance range of dual active bridges suitable for single-phase shift control, so as to solve the problems that the above-mentioned existing DAB inductance selection range is not well considered and cannot ensure high reliability of the circuit. The present invention considers the two major constraints of circuit output maximum power requirement and circuit power device zero-voltage switch requirement, and simultaneously considers the characteristic current value direction requirement, inductance energy meeting the primary-side commutation requirement and dead zone when analyzing the zero-voltage switch requirement The matching of time and inductance value requires three major conditions, and the inductance value range that satisfies the three major conditions and two constraints is obtained

Images