CN104167910A - Technology for restraining charge pump DC-DC converter ripples with alternating-current negative feedback - Google Patents
Technology for restraining charge pump DC-DC converter ripples with alternating-current negative feedback Download PDFInfo
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- CN104167910A CN104167910A CN201410442654.XA CN201410442654A CN104167910A CN 104167910 A CN104167910 A CN 104167910A CN 201410442654 A CN201410442654 A CN 201410442654A CN 104167910 A CN104167910 A CN 104167910A
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Abstract
A capacitive type switching power source has the advantages of being low in electro magnetic interference (EMI), high in efficiency, small in size and the like and is an important component of a power management system. A method for restraining ripples with an alternating current negative feedback loop is provided for a switched capacitive type DC-DC converter. According to the method, the error amplifier output and the DC-DC output are connected through a coupling capacitor (CC) to form the alternating current negative feedback loop (shown in the attached map), a loop gain A of the loop under the switching frequency is used for restraining the output ripple voltage to be one (1+A)th of the original voltage, high efficiency of the system is ensured, and meanwhile output voltage ripples are reduced.
Description
Technical field:
Patent of the present invention contains switching capacity type DC-DC commutator principle, Ripple Noise inhibition technology.
Background technology:
Development along with integrated circuit technique, a large amount of appearance of portable mobile termianl, especially in recent years, popularizing of the products such as smart mobile phone, panel computer, GPS, electronic system has also proposed more requirement to power supply, such as: portability, low-power consumption, stable output, high efficiency etc., promoted the development of portable electric appts power technology.Electronic system can not directly be powered for it by battery or power supply adaptor conventionally, conventionally needs a voltage modulator that unsettled direct voltage is converted to stable system power supply power supply.At present, DC-DC transducer is mainly divided into two classes: linear voltage regulator and Switching Power Supply modulator.Linear voltage regulator has the advantages such as low ripple, low noise, simplicity of design, is widely used in the occasion to noise-sensitive, but it is also efficient lower and can only realize the shortcomings such as step-down.Switching Power Supply is divided into again inductive type and capacitor type.Wherein, inductive type Switching Power Supply energy-storage travelling wave tube is inductance, and advantage is that conversion efficiency is high, and shortcoming is at output, to have ripple to disturb, and has electromagnetic interference (EMI) problem; Capacitor type (claiming again charge-pump type) Switching Power Supply is used electric capacity as energy-storage travelling wave tube, greatly reduces EMI, and conversion efficiency is also higher, and shortcoming is that output Ripple Noise is larger.
Simulation and radio circuit, to noise-sensitive, adopt the power supply of linear voltage stabilization source conventionally, although this has been avoided the noise jamming of power supply, system effectiveness is lower.If switching mode DC-DC converter efficiency is than the high problem (also will solve EMI problem to inductive type Switching Power Supply) that can solve its output Ripple Noise in linear voltage stabilization source, can be by switching mode DC-DC converter application in simulation and the radio circuit of noise-sensitive, thereby raising system effectiveness, this is even more important to portable system.The present invention proposes a kind of Ripple Suppression technology, when guaranteeing power-efficient, have extra hardware expense seldom, making switching capacity type DC-DC transducer is directly that simulation and radio circuit power supply become possibility.
Summary of the invention:
The present invention is directed to the output ripple interference problem of charge-pump type Switching Power Supply, proposed a kind of utilization and exchanged degenerative Ripple Suppression technology.Conventionally, Switching Power Supply for by stable output on certain specific voltage, output voltage sampling relatively can be produced to error signal with reference voltage, and amplify through error amplifier, then through the feedback loop of a low-pass characteristic, by modulation, discharge and recharge frequency (PFM and cycle-skipping modulation PSM), discharge and recharge at every turn electric charge number (current limliting modulation, linear modulation), or the method such as the size of the resistance of output serial connection (modulation afterwards) is controlled output voltage.This Ripple Suppression technology can be utilized existing error amplifier (or increasing in addition a special error amplifier), error signal after amplifying is fed back to output through the coupling capacitance of a stopping direct current, form a feedback loop for error signal alternating current component.In system charge and discharge process, system output voltage ripple is added to electric capacity one end after negative feedback is amplified, and saltus step can not occur the voltage at electric capacity two ends, thereby the ripple amplifying after anti-phase has been added in again output, offset with former output ripple, thereby suppressed output voltage ripple.This technology is proportional to the loop gain of feedback control loop under switching frequency to the inhibition degree of ripple.
Accompanying drawing explanation:
1 one kinds of switching capacity DC-DC converter system block diagrams that comprise Ripple Suppression of accompanying drawing
Accompanying drawing 2 charge pump DC-DC output voltages contrast before and after using Ripple Suppression
Embodiment:
The output of Ripple Suppression negative feedback loop route system, error amplifier and ac coupling capacitor C
cform, system output connects the negative terminal of error amplifier after dividing potential drop, and reference voltage connects anode, coupling capacitance one terminating systems output, the output of another termination error amplifier.Suppose that error amplifier gain is A
eA, feedback factor β is by SC
cz
l/ (SC
cz
l+ 1) (Z wherein
lparallel impedance for load resistance and load capacitance) and to the product of the ratio R 2/ (R1+R2) of the sampling resistor of output voltage determine.Easily judgement, feedback network is high pass characteristic.By selecting enough large C
c, the switching noise after amplifying can be fed back to system output, offset with original output voltage ripple, ripple is reduced to 1/ original (1+A
aEβ).
Claims (2)
1. for a Ripple Suppression technology for charge pump DC-DC converter, it is characterized in that between error amplifier output and DC-DC output by coupling capacitance C
cconnect, form and exchange feedback loop, the loop gain that exchanges feedback loop by this suppresses output ripple.
2. for Ripple Suppression technology claimed in claim 1, it is characterized in that DC-DC system output voltage V
outsampled voltage V
fwith alternating voltage be zero reference voltage V
refbe connected on respectively negative input and the positive input terminal of an error amplifier, error amplifier output is by coupling capacitance C
cwith DC-DC system output V
outconnect, form and exchange feedback loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410442654.XA CN104167910A (en) | 2014-08-29 | 2014-08-29 | Technology for restraining charge pump DC-DC converter ripples with alternating-current negative feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410442654.XA CN104167910A (en) | 2014-08-29 | 2014-08-29 | Technology for restraining charge pump DC-DC converter ripples with alternating-current negative feedback |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104167910A true CN104167910A (en) | 2014-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410442654.XA Pending CN104167910A (en) | 2014-08-29 | 2014-08-29 | Technology for restraining charge pump DC-DC converter ripples with alternating-current negative feedback |
Country Status (1)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5973944A (en) * | 1997-11-19 | 1999-10-26 | Linear Technology Corporation | Inductorless step-up and step-down converter with inrush current limiting |
| CN201584894U (en) * | 2009-11-25 | 2010-09-15 | 天津南大强芯半导体芯片设计有限公司 | Voltage controlled charge pump circuit |
| CN102104331A (en) * | 2010-12-29 | 2011-06-22 | 复旦大学 | Frequency compensating circuit suitable for switched-capacitor direct-current voltage converter |
| CN102684481A (en) * | 2012-05-24 | 2012-09-19 | 苏州脉科库博环保科技有限公司 | Wide-input range and low-ripple step-down circuit for charge pump |
-
2014
- 2014-08-29 CN CN201410442654.XA patent/CN104167910A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5973944A (en) * | 1997-11-19 | 1999-10-26 | Linear Technology Corporation | Inductorless step-up and step-down converter with inrush current limiting |
| CN201584894U (en) * | 2009-11-25 | 2010-09-15 | 天津南大强芯半导体芯片设计有限公司 | Voltage controlled charge pump circuit |
| CN102104331A (en) * | 2010-12-29 | 2011-06-22 | 复旦大学 | Frequency compensating circuit suitable for switched-capacitor direct-current voltage converter |
| CN102684481A (en) * | 2012-05-24 | 2012-09-19 | 苏州脉科库博环保科技有限公司 | Wide-input range and low-ripple step-down circuit for charge pump |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141126 |
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| WD01 | Invention patent application deemed withdrawn after publication |