Generator H bridge excitation device and method applicable to aircraft power supply system

Abstract

The invention provides a generator H bridge excitation device and a method applicable to an aircraft power supply system. Four power transistor devices are used to form a generator excitation circuitin an H bridge power module mode, and driving control signals can perform independent on and off control on the four power transistor devices respectively; and through time-sharing conduction of two groups of diagonal transistors, change of an excitation current direction in a generator excitation winding can be realized. In an excitation state, driving control on the diagonal power transistors inthe H bridge adopts an overlapped conduction mode, and the excitation current generation time is the time for simultaneous conduction of a certain pair of diagonal power transistors; in a de-excitation state, afterflow and de-excitation of the excitation circuit can be realized through conduction of a single transistor in the lower transistor in the H bridge and device features of the power transistors. Remedies are made in view of features of quick conduction and slow cut off of a single power transistor, and when the switching frequency of pulse width modulation is increased at an order ofmagnitude, the excitation circuit control precision can be effectively improved, the excitation current pulsation rate is thus reduced, and the generator end output power quality is further improved.

Description

technical field [0001] The invention belongs to the field of generator excitation drive, and relates to a generator H-bridge excitation device and method suitable for aviation power supply systems. Background technique [0002] For the aircraft system, its power supply system is responsible for the power supply function of the entire aircraft, and the power and quality of the power supply system are very important. A high power density, high-quality power supply can not only provide excellent electrical energy for the electrical equipment on board, but also save space and weight on board, which is the ultimate goal that aviation technicians follow in the design. [0003] The aviation power system is generally composed of generators, generator voltage regulators, and current transformers. Among them, the voltage regulator mainly completes the adjustment of the excitation current of the generator, so that the generator terminal outputs the electric energy that meets the power...

AI Technical Summary

Problems solved by technology

However, due to the limitations of the inherent characteristics of the device, the excitation current generation and the freewheeling mode of the traditional single-transistor voltage regulator, when the switching frequency of the pulse width modulation increases by an order of magnitude, the on-time, cut-off time, and excitation current freewheeling The influence of time in the control cycle is prominent, that is, within the cut-off time, the proportion of time required for excitation current consumption is too large, resulting in uncontrolled generator terminal voltage at cut-off time

[0007] Since the single-transistor voltage regulator loses its adjustment accuracy during high-frequency pulse width modulation, or even is out of control, it can no longer meet the current needs

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