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A digital state machine for low ripple charge pump dc‑dc converter control

A digital state, converter technology, applied in output power conversion devices, conversion equipment without intermediate conversion to AC, electrical components, etc., can solve problems such as large output ripple

Inactive Publication Date: 2017-07-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control method is to keep the output within the rated value range by jumping back and forth between the two conversion ratios. The logic is simple, but under certain load conditions, the output ripple will be caused by the frequent jumps of the conversion ratio. larger

Method used

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  • A digital state machine for low ripple charge pump dc‑dc converter control
  • A digital state machine for low ripple charge pump dc‑dc converter control
  • A digital state machine for low ripple charge pump dc‑dc converter control

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Embodiment Construction

[0017] The input of the state machine is d 1 d 2 AB, signals d2 and d1 are 2bit digital quantities after the input voltage is passed through the ADC, d 2 is high, d1 is low; signals A and B are the output signals of the output detection circuit; output signals en and t 32 is the control signal of the topology in the switched capacitor array, that is, the conversion ratio control signal, S 1 It is the PSM mode control signal.

[0018] The design of the state machine includes a total of nine states from Q0 to Q8, among which Q0 is the initial state, and the states Q2 and Q3 correspond to two conversion ratios of ×2 / 3 and ×1. These two states cannot enable the pulse-skipping modulation PSM mode; Q1 , Q4 and Q5 respectively correspond to three conversion ratios of ×1 / 2, ×2 / 3 and ×1, and the PSM mode can be turned on in these three states; Q6, Q7 and Q8 respectively correspond to ×1 / 2, ×2 / The PSM state is turned on under three conversion ratios of 3 and ×1.

[0019] When the ...

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Abstract

A switch power supply is high in efficiency, low in EMI, small in size, and is an important component of a power supply management system; the invention aims to a switch capacitance type DC-DC converter, uses the gain jump modulation technology and pulse slope modulation (PSM ) technology, and provides a mode control method based on a digital state machine; the method selects a proper modulation mechanism according to load current changes, firstly carries out coarse adjustment for output voltage through gain jump, and the PSM technology carries out fine tuning for the output voltage, thus ensuring the system to have high efficiency, and reducing output voltage ripples; the control method applies to application fields sensitive to efficiency and noises.

Description

[0001] Technical field: [0002] The invention patent covers the principles of switched capacitor DC-DC converters, ripple noise suppression technology, and digital state machine control fields. [0003] Background technique: [0004] With the continuous development of integrated circuit technology, a large number of portable mobile terminals have appeared, especially in recent years, smart phones, tablet computers, GPS and other products have higher and higher requirements for power supply, so the power supply has also raised More requirements, such as: portability, low power consumption, stable output, high efficiency, etc. It has promoted the rapid development of the power supply of portable electronic equipment. Electronic systems usually cannot be directly powered by batteries or power adapters, and usually require a voltage modulator to convert the unstable DC voltage into a stable system power supply. Currently, DC-DC converters are mainly divided into two categories: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07H02M1/14
CPCH02M1/14H02M3/07
Inventor 卜刚邹志鹏邹鹭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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