Multiphase pulse-width modulators for devices with a multichannel principle of electric power conversion

Аuthors

Shevtsov D. A., Poletaev A. S.^*

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: poletaev.a@mail.ru

Abstract

The energy path separation of switched mode electric energy converters into several channels with power switches control in different phases is a promising method for increasing the energy efficiency, reliability, and manufacturability of these devices. Selection of pulse-width modulator control mode for power converting cells while synthesizing the structure of a switched mode power converter with stabilized output voltage is of fundamental importance. Current mode has a number of significant advantages over Voltage mode.

They are as follows:

– better regulation dynamics;

– possibility of simpler overcurrent protection ensuring;

– automatic uniform distribution of currents between power converting cells. The main disadvantage of current mode is the possibility of subharmonic oscillations occurrence in continuous current mode. To ensure subharmonic stability, slope-compensation, or the duty cycle limited within the range of 0–0.5 are applied.

The article proposes three circuit solutions for multiphase basic frequency generator with a duty cycle equal to 0.5 and uniform time shift between phases for multiphase pulse-width modulators in Current mode.

A generator with a number of phases of N, defined as N = 2^k, where k is a natural number, can be built employing T-flip-flops. The N-phase generator circuit, requires N–1 triggers. The disadvantage of the scheme

is the limited choice of the possible number of phases. Its advantages consist in realization simplicity and automatic restoration after a failure caused by external jamming.

A generator with any integer number of phases N – k can be realized employing a shift register. N-phase generator circuit requires an N bits register. The circuit is also insensitive to failures.

A generator with an even number of phases N – 2k can also be implemented employing a shift register. To obtain N phases according to this principle l – N/2 register bits are sufficient. The drawback of the last proposed scheme is inability of its automatic recover after a failure.

Keywords:

multichannel principle of electric power conversion, multiphase switched mode converters, pulse-width modulation, square-wave generator

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