Multiphase DC-DC converter control system and method

Abstract

The invention discloses a multiphase DC-DC converter control system and method, the system comprises a COT architecture module and a current balance control module connected with the COT architecture module, the COT architecture module comprises an ontime generation circuit module, and the current balance module comprises a sample hold circuit module and an error amplifier. According to the invention, a plurality of sampling hold circuit modules corresponding to a plurality of phase channels and an error amplifier are arranged in the current balance module, so that the error amplifier outputs a plurality of current error signals. After current error signals corresponding to all phases in the current balance control module enter the COT architecture module, generation of pulse signals of channels of all phases is controlled, the magnitude of the pulse signals is adjusted, and finally the inductive current of the output stage is influenced. The current sampling link of each channel is reduced, the link from channel feedback to PWM signal adjustment is simplified, the current balance accuracy of each phase is improved, and the possibility of mismatching of each channel circuit is reduced.

Description

technical field [0001] The invention relates to the technical field of DC-DC converter chips, in particular to a control system and method for a multi-phase DC-DC converter. Background technique [0002] Multi-phase DC-DC (Multi-Phase Direct Current to Direct Current) converter uses multiple current channels to provide load current at the same time, so the system can provide a larger load current than the single-phase system, and can provide better system dynamic instantaneous State performance, but also effectively reduce the ripple of the output voltage. In addition, since the power supply pressure of the system is dispersed by multiple current channels, the system’s current and power consumption requirements for power-level components are reduced, and system costs can also be reduced. Due to the many advantages of multi-phase DC-DC converters, they have been used in various This field, especially some high-current applications, such as CUP, GPU power supply. [0003] Ho...

AI Technical Summary

Problems solved by technology

Since there are many processing links in the process of channel current balance, it is easy to cause the processing mismatch of each channel in a certain link, resulting in an error in current balance.

In addition, the sampling circuit and current calculation of each channel also cause the complexity of the current balance circuit

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