DC/DC controller based on time-delay phase modulation circuit

Abstract

The invention discloses a DC / DC controller based on a time-delay phase modulation circuit. The DC / DC controller comprises a clock generation circuit, a pulse width generating circuit, the time-delay phase modulation circuit and an OR-gating circuit, wherein the clock generation circuit performs frequency multiplication on an input clock signal to generate a basic clock signal and inputs the basic clock signal into the pulse width generating circuit; meanwhile, the basic clock signal is subjected to time delay to generate a time-delay clock signal which is input to the time-delay phase modulation circuit; the pulse width generating circuit generates a coarsely modulated pulse width signal and inputs the coarsely modulated pulse width signal into the time-delay phase modulation circuit and the OR-gating circuit; the time-delay phase modulation circuit performs time delay on the coarsely modulated pulse width signal to generate eight paths of time-delay pulse width signals, and inputs the eight paths of time-delay pulse width signals into the OR-gating circuit; the OR-gating circuit selects one path of the corresponding time-delay pulse width signal; then the corresponding time-delay pulse width signal and the coarsely modulated pulse width signal pass through an OR gate, and a final DC / DC control signal is output. According to the DC / DC controller, accurate time delay on the coarsely modulated pulse width signal is realized through the time-delay phase modulation circuit; the duty ratio resolution ratio of the DC / DC control signal is improved under a condition of not changing the basic clock signal; and therefore, the DC / DC controller has relatively high accuracy, universality and applicability.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a DC / DC control circuit. Background technique [0002] Pulse width modulation (PWM) type DC / DC converters are widely used in portable electronic products such as cameras, video cameras, PDAs, and laptop computers. There are two architectures of PWM DC / DC converters, analog and digital. The product area of ​​the analog architecture is small, low power consumption, occupying the mainstream of the market, but it is very sensitive to noise; while the digital design architecture has good scalability, high stability, and is relatively insensitive to external noise, which can just make up for the lack of analog architecture. shortcoming. From the perspective of the development requirements of DC / DC converters, digital control technology is necessary. In the current design of the digital architecture DC / DC, there is a common disadvantage that the resolution of the duty...

AI Technical Summary

Problems solved by technology

However, this scheme has the following disadvantages: as the basic clock frequency increases, this scheme cannot meet the expected requirements, and when the basic clock resolution remains unchanged, the modulation accuracy cannot be improved, but the modulation accuracy is low

In addition, the design scheme is more complicated, the design process requirements are higher, and the cost is more expensive

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