DC voltage controller based on time-delay phase modulation circuit

Abstract

The invention discloses a DC voltage controller based on a time-delay phase modulation circuit; the controller comprises a clock forming circuit, a pulse width generation circuit, a time-delay phase modulation circuit, and an or-gating circuit; the clock forming circuit doubles a clock signal frequency and forms a basic clock signal, inputs the basic clock signal to the pulse generating circuit, delays the basic clock signal so as to form a delay clock signal, and inputs the delay clock signal to the time-delay phase modulation circuit; the pulse width generation circuit forms a coarse adjustment pulse width signal, and inputs same to the time-delay phase modulation circuit and the or-gating circuit; the time-delay phase modulation circuit delays the coarse adjustment pulse width signal soas to form 8-path time-delay pulse width signals, and inputs same into the or-gating circuit; the or-gating circuit selects 1-path corresponding time-delay pulse width signal, combines the coarse adjustment pulse width signal, and finally outputs a DC voltage control signal through the or gate. The controller uses the time-delay phase modulation circuit to precisely delay the pulse width coarse adjustment signal, thus improving the duty ratio resolution of the DC voltage control signal without changing the basic clock signal.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a DC voltage controller based on a delay phase modulation circuit. Background technique [0002] Pulse width modulation (PWM) DC voltage converters are widely used in portable electronic products such as cameras, video cameras, PDAs, and laptop computers. There are two architectures of PWM type DC voltage 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 the DC voltage converter, digital control technology is necessary. At present, in the design of the DC voltage of the digital ...

AI Technical Summary

Problems solved by technology

At present, in the design of DC voltage in digital architecture, there is a common defect that the resolution of PWM signal duty cycle is difficult to improve.

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