THE ERROR IN LINEARIZING THE CHARACTERISTICS OF THE REGULARIZING CIRCUIT OF PULSE-WIDTH MODULATION VOLTAGE AND CURRENT STABILIZERS

Pulsed (in particular, pulse-width) voltage and current stabilizers ar e widely used in the power supplies in communications apparatus. In a number of cases increased requirements are imposed on them as regards the accuracy with which the output parameter is regulated. To obtain a low static stabilization error one has to ensure that the pulse stabi lizer is stable. As we know [1], pulsed stabilizers with pulse-width m odulation are nonlinear pulse devices, and methods of analyzing their operation have not been investigated to any great extent. A number of accurate and approximate methods of analyzing the stability of pulsed stabilizers employing pulse-width modulation exist. The accurate metho ds reduce to a numerical solution of the equations representing the gi ven device. A drawback of the accurate methods is that each algorithm can only be used for a narrow class of devices. Hence, approximate met hods of estimating the stability of pulsed stabilizers are the most wi dely used. These are based on replacing the nonlinear pulse sections b y a linear pulse or continuous model. In this case, the reserves of st ability are best estimated from the logarithmic amplitude-frequency an d phase-frequency responses of the regulation circuit [2]. This method of calculation is the simplest and dearest and enables one to check t he results of the calculation experimentally. However, it is only poss ible to replace pulse sections by linear ones under certain constraint s. The problem considered in this paper is to refine the linear contin uous model of pulsed stabilizers.