A voltage adaptive power conversion system based on pulse width modulation

Abstract

The application relates to the technical field of power electronics and switching power supply control, in particular to a voltage adaptive power conversion system based on pulse width modulation, which comprises a power conversion circuit, a data acquisition module, a transient characteristic extraction module, a parasitic impedance evaluation module, a control signal generation module and a fusion switching module; input voltage, input voltage change rate, output voltage, output voltage high-frequency ripple component, load current and load current change rate are acquired to determine the danger level; the parasitic parameter state of the post-stage power supply network is evaluated and the critical current change rate is calculated by using the inherent high-frequency ripple of pulse width modulation; the target duty cycle is calculated by combining an input feedforward compensation algorithm and a digital proportional integral differential control algorithm, and the maximum change amount of the target duty cycle in a single period is limited, and the final pulse width modulation driving signal is output; the application realizes power conversion, output voltage recovery and post-stage high-frequency electric heating stress suppression.

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