PWM soft switching impedance adjustment parallel current sharing solid power controller

Abstract

The invention relates to a PWM soft switching impedance adjustment parallel current sharing solid power controller, and the controller comprises a plurality of groups of solid power controllers connected in parallel; each group of solid power controllers comprises a high-end sampling circuit used for carrying out high-precision differential sampling on the current flowing through the solid power controller, wherein the microcontroller is started to work by inputting a control signal into the input controller; the microcontroller can receive an input control signal to normally open the main power switch tube and the auxiliary power switch tube, perform analog quantity-to-digital quantity conversion on the sampling current, judge the current sharing state, adjust and control the output PWM soft switch to drive the input controller of the auxiliary power switch tube and the microprocessor driving circuit; the parallel power switch tube circuit and the voltage conversion circuit are used for switching on and switching off an input voltage, supplying power to a load and controlling the conduction state of an auxiliary power switch tube through a PWM soft switch to change conduction impedance so as to realize parallel current sharing of multiple groups of solid power controllers; and the parallel current sharing of multiple paths of solid power controllers can be realized.

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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