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A charge pump ripple suppression method based on multi-step discharge of flying capacitor

A technology of ripple suppression and flying capacitors, applied to electrical components, output power conversion devices, and conversion equipment without intermediate conversion to AC, can solve the problems of low overall efficiency and low efficiency

Inactive Publication Date: 2018-11-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this scheme uses a low-efficiency linear regulated source as a filter to suppress ripples, the overall efficiency is low

Method used

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  • A charge pump ripple suppression method based on multi-step discharge of flying capacitor
  • A charge pump ripple suppression method based on multi-step discharge of flying capacitor
  • A charge pump ripple suppression method based on multi-step discharge of flying capacitor

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Experimental program
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Embodiment Construction

[0016] 1) The switching power tube connected to the output terminal is driven by the waveform generating circuit, and the flying capacitor discharges the load through the switch after a charging cycle, as shown in the attached figure 2 And attached image 3 shown;

[0017] 2) During the discharge cycle, the charge on the flying capacitor is not discharged once after the switch is closed, but is completed after n (n is an integer greater than 1) discharge states;

[0018] 3) Each discharge state corresponds to the closing and opening process of a switch;

[0019] 4) The slopes of the rising and falling edges of the driving switch closed waveform are finely controlled respectively, as shown in the attached Figure 4 And attached Figure 5 shown;

[0020] 5) The leading edge of the waveform driving the gate of the switching tube (the rising edge for the N-type switch and the falling edge for the P-type switch) is composed of two broken lines with different slopes, of which t...

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Abstract

The present invention is aimed at a charge pump type DC-DC converter. After charging a flying capacitor once, the load is discharged multiple times, so that the discharge current is decomposed from a large pulse into a plurality of small pulses. At the same time, by controlling the slope of the rising and falling edges of the waveform that drives the gate of the switching tube connected to the flying capacitor and the load, the switch is slowly closed and disconnected, thereby smoothing each discharge current pulse and making the discharge current approximately tend to the load current, reducing the accumulation of charge on the load capacitor, so as to achieve the purpose of reducing the output voltage ripple.

Description

Technical field: [0001] The invention patent covers the principle of switched capacitor DC-DC converter and the ripple suppression method. Background technique: [0002] With the continuous development of integrated circuit technology, a large number of portable mobile terminals have appeared, especially in recent years, with the popularization of smart phones, tablet computers, GPS and other products, electronic systems have also put forward more requirements for power supply, such as: portable High performance, low power consumption, stable output, high efficiency, etc., have promoted the development of power supply technology for portable electronic equipment. Electronic systems usually cannot be directly powered by batteries or power adapters, but 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: linear regulators and switching power supply modulators. Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M3/07
CPCH02M1/14H02M3/07H02M3/072
Inventor 卜刚方芳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS