pwm soft switch impedance adjustment parallel current sharing solid state power controller

Abstract

The present invention is a PWM soft-switching impedance-adjusting parallel current-sharing solid-state power controller, including multiple groups of solid-state power controllers connected in parallel, and each group of solid-state power controllers includes a high-precision differential sampling device for the current flowing through the solid-state power controller to which it belongs. High-end sampling circuit; it is used to start the micro-controller through the input control signal of the input controller. The micro-controller can receive the input control signal and normally connect the main and auxiliary power switch tubes, and convert the sampling current from analog to digital. Judging the current sharing state to adjust and control the output PWM soft switch to drive the input controller and microprocessor drive circuit of the auxiliary power switch tube; to realize the on and off of the input voltage, which is used to turn on and supply power to the load and through the PWM soft switch Controlling the conduction state of the auxiliary power switch tube is used to change the conduction impedance to realize the parallel connection of multiple solid state power controllers and the voltage conversion circuit; it can realize the parallel connection of multiple solid state power controllers.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a PWM soft-switching impedance-adjusting parallel-connected current-equalizing solid state power controller. Background technique [0002] With the continuous development of aviation manufacturing, control and maintenance technologies, the overall performance of the aircraft has been greatly improved, the overall electrical equipment on the aircraft has increased sharply, and the power of the power supply has continued to increase. Automatic power distribution systems have become the research direction of high-power power distribution in aircraft power systems. Research on Solid State Power Controllers (SSPC) in automatic power distribution systems has attracted more and more attention from professionals. At the same time, some specific occasions have put forward higher requirements for solid state power controllers: due to the circuit The parasitic parameters of each s...

AI Technical Summary

Problems solved by technology

For the method of connecting resistors in series in parallel circuits, due to the loss characteristics of resistors, although current sharing can be achieved by connecting resistors in series, it will increase the loss of the circuit at the same time, and the current sharing effect is not good.

For the series coupling inductor method in the parallel circuit, due to the volume of the inductor magnetic core and other issues, it is difficult to achieve multi-channel current sharing, which limits the realization of high power density, and the series coupling will also increase the loss of the circuit

[0004] Common solid state power controllers usually choose the master-slave mode for current sharing. This method uses one of the units as the master control unit and communicates with other units to control all units to achieve current sharing. , this method has a disadvantage. When the main control unit is effective, the circuit cannot achieve parallel current sharing, and it is necessary to increase the communication program. The control program is complicated and difficult to implement.

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