A dc/dc controller based on digital delay circuit

Abstract

The invention discloses a DC / DC controller based on a digital delay circuit. The DC / DC controller is composed of a clock generating circuit, a pulse width generating circuit, a digital delay circuit and or a gating circuit. The clock generation circuit multiplies the frequency of the input clock signal to generate a basic clock signal that is input to the pulse width generation circuit. The pulse width generating circuit generates a coarsely adjusted pulse width signal and inputs it to a digital delay circuit and or a gating circuit. The digital delay circuit delays the coarse pulse width signal to generate 32 delay pulse width signals, and then the selector selects one corresponding delay pulse width signal and inputs it to the OR gate circuit. The final delayed pulse width signal and the coarsely adjusted pulse width signal pass through the OR gate circuit to output the final DC / DC control signal. The present invention delays the rough pulse width signal through a digital delay circuit, and improves the duty ratio resolution of the DC / DC control signal by 32 times under the condition that the basic clock signal remains unchanged, and has strong accuracy, Versatility 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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