Multi-phase pulse-width modulator for loading current balance and its pulse delayed unit

Abstract

This is a multi-phase pulse width modulator for loading current balance. It includes an error magnify unit supplying error voltage; a sawtooth wave surge unit supplying sawtooth wave surge voltage; a multi-phase pulse width modulating unit outputing a modulating signal by receiving the error voltage and the sawtooch wave voltage; a comparing voltage unit supplying delta control voltage; a pulse delay unit outputting an adjusted control voltage by adjusting loading cycle of the multi-phase pulse width modulating signal from receiving the delta control voltage; a switch driving unit outputting a driving voltage from receiving the control voltage; and a switch unit outputting loading balance voltage from receiving the switch driving voltage.

Description

technical field [0001] The invention relates to a multiphase pulse width modulation device, in particular to a multiphase pulse width modulation device for balancing load current. Background technique [0002] Multi-phase DC-DC step-down converters are widely used in power circuits. There are many switches inside the multi-phase DC-DC step-down converter. Each switch is controlled by an individual phase pulse width modulation signal with phase shift. , to generate a single output signal, for example, the converter output voltage. When multi-phase DC-DC step-down converters supply the same load, usually there will be a voltage mismatch in these channels. If the output voltage of two or more channels is slightly different, the current will flow from Some converters have the ability to step down the current to match the output current of the power supply. [0003] Without considering the load current, the current in those converters may flow from one pipeline to another, caus...

AI Technical Summary

Problems solved by technology

[0004] The multi-phase DC-DC step-down converter relies on the parameters and components between each phase or pipeline to meet the same load current capability. The multi-phase DC-DC step-down converter is for any load between pipelines The misalignment of the current distribution caused by the cycle is particularly sensitive. It is very difficult to achieve the coordination of the load cycle of the multitasking phase, because the mismatch of the internal components in each pipeline will cause timing errors, and thus cause the imbalance of the load current.

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