CN111211671A - Double-output voltage ripple control method and device for single-inductor double-output switch converter - Google Patents
Double-output voltage ripple control method and device for single-inductor double-output switch converter Download PDFInfo
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- CN111211671A CN111211671A CN202010204036.7A CN202010204036A CN111211671A CN 111211671 A CN111211671 A CN 111211671A CN 202010204036 A CN202010204036 A CN 202010204036A CN 111211671 A CN111211671 A CN 111211671A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
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Abstract
The invention discloses a method and a device for controlling double-output voltage ripples of a single-inductor double-output switching converter. The control method comprises two output voltage ripple controls. The two output voltage ripple controls respectively comprise a voltage outer ring and a voltage inner ring, the voltage outer ring compares the detected output voltage with a reference voltage, an obtained error signal is compensated by an error amplifier and then is used as a reference voltage of the voltage inner ring, the voltage inner ring detects the output voltage ripple and compares the output voltage ripple with the reference voltage, and the comparison result is used for controlling the switching-off of the branch switching tube; the clock signal is used for controlling the conduction of the branch switching tube. The invention can quickly adjust the control pulse of the switch tube, has short output voltage adjusting time and better load transient performance of the converter. The invention can also effectively reduce the cross influence among the output branches and has good system stability.
Description
Technical Field
The invention relates to the technical field of switch converters, in particular to a double-output voltage ripple control method and device of a single-inductor double-output switch converter.
Background
The single-inductor double-output switch converter can independently control two paths of power supply outputs, has the advantages of small size, high efficiency, low cost and the like, and can provide reliable power supplies for smart phones, tablet computers and the like. The microprocessor as the core device of mobile phone and computer is a fast varying load with wide variation range and fast variation speed. The research on the transient response characteristic of the converter is receiving more and more attention from the academic world.
The traditional peak current control has the control idea that: the control circuit comprises a voltage outer ring and a current inner ring, the voltage outer ring compares the detected output voltage with reference voltage, an obtained error signal is compensated by an error amplifier and then is used as reference current of the current inner ring, the inductive current detected by the current inner ring is compared with the reference current, and the comparison result is used for controlling the switch-off of the switching tube; the clock signal controls the conduction of the switch tube; therefore, the output voltage of the switching converter is regulated. The method is used for a single-inductor dual-output converter and has the defects of serious cross influence among output branches and low load transient response speed.
Disclosure of Invention
The invention aims to provide a control method and a control device for a single-inductor double-output switching converter, which have better load transient performance and smaller output cross influence and are suitable for various topological structures of the single-inductor double-output switching converter.
The technical scheme for realizing the purpose of the invention is as follows:
single-inductor dual-output switching converter dual-output voltage ripple control method and output voltage ripple controller CTR1Detecting the output voltage V of the single-inductor dual-output switching converteroaAnd an output voltage ripple Vc1(ii) a Output voltage VoaAnd a voltage reference value Vref1Via error amplifier EAP1Generating an amplified error signal Ve1Sent to a comparator CMP1Negative input terminal of, output voltage ripple Vc1Amplified output voltage ripple Vk1Sent to a comparator CMP1The positive input end of (a); vk1And Ve1The comparison result is sent to the RS flip-flop TGR1R end of the control branch switch tube S1Turn off of (1); clock signal CLK is fed into RS flip-flop TGR1The S end of the control branch switch tube S1Conduction of (1); output voltage ripple controller CTR2Detecting the output voltage V of the single-inductor dual-output switching converterobAnd an output voltage ripple Vc2(ii) a Output voltage VobAnd a voltage reference value Vref2Via error amplifier EAP2Generating an amplified error signal Ve2Sent to a comparator CMP2Negative input terminal of, output voltage ripple Vc2Amplified output voltage ripple Vk2Sent to a comparator CMP2The positive input end of (a); vk2And Ve2The comparison result is sent to the RS flip-flop TGR2R end of the control branch switch tube S2Turn off of (1); clock signal CLK is fed into RS flip-flop TGR2The S end of the control branch switch tube S2Is turned on.
A single-inductor dual-output switch converter dual-output voltage ripple control device comprises an output voltage ripple controller CTR1And CTR2(ii) a The output voltage ripple controller CTR1Comprising a voltage detection circuit VS connected in sequence1Error amplifier EAP1Comparator CMP1RS flip-flop TGR1And a drive circuit DR1And further comprising connecting to CMP1Voltage amplifier VK1，EAP1Is also connected with a reference voltage Vref1，TGR1Also connected to a clock signal CLK; the output voltage ripple controller CTR2Comprising a voltage detection circuit VS connected in sequence2Error amplifier EAP2Comparator CMP2RS flip-flop TGR2And a drive circuit DR2And further comprising connecting to CMP2Voltage amplifier VK2，EAP2Is also connected with a reference voltage Vref2，TGR2Also connected to a clock signal CLK; the VS1、VS2、VK1、VK2、DR1And DR2Respectively connected to the single-inductor dual-output switching converter.
Further, the single-inductor dual-output switching converter is a Buck converter, a Boost converter, a Buck-Boost converter or a Bipolar converter.
Compared with the prior art, the invention has the beneficial effects that:
when the load of the single-inductor double-output switching converter changes, the invention can quickly adjust the control pulse of the switching tube, the output voltage adjustment time is short, and the load transient performance of the converter is better.
When the load of the output branch of the single-inductor double-output switching converter changes, the invention can effectively reduce the cross influence among the output branches and has good system stability.
Drawings
FIG. 1 is a system block diagram of the present invention.
Fig. 2 is a block diagram of a circuit structure when the single-inductor dual-output Buck converter is adopted in the invention.
Fig. 3 is a diagram of the operating time sequence and the inductor current waveform of the circuit operating in the inductor current continuous conduction mode when the single-inductor dual-output Buck converter is adopted.
FIG. 4 is a control timing chart of the control device of the present invention.
Fig. 5 is a simulated transient time domain waveform of the single-inductor dual-output switching converter and the peak current control single-inductor dual-output switching converter respectively when the loads of the output branches a and b change. Fig. 5a is a transient response waveform of a peak current control single-inductor dual-output switching converter when a load of an output branch a changes, and fig. 5b is a transient response waveform of the present invention when a load of the output branch a changes; fig. 5c is a transient response waveform of the peak current control single-inductor dual-output switching converter when the load of the output branch b changes, and fig. 5d is a transient response waveform of the invention when the load of the output branch b changes.
Detailed Description
The invention relates to a method and a device for controlling double-output voltage ripples of a single-inductor double-output switching converter. The output voltage ripple control circuit comprises a voltage outer ring and a voltage inner ring, the voltage outer ring compares the detected output voltage with a reference voltage, an obtained error signal is compensated by an error amplifier and then is used as a reference voltage of the voltage inner ring, the voltage inner ring detects the output voltage ripple and compares the output voltage ripple with the reference voltage, and the comparison result is used for controlling the switching-off of the branch switching tube; the clock signal is used for controlling the conduction of the branch switching tube. The output voltage can directly reflect the change of the load, and when the load current changes, the control circuit can quickly adjust, so that the output voltage ripple control single-inductor double-output converter has the advantages of small output cross influence and good load transient performance.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a specific embodiment of the present invention is: a dual-output ripple control device for single-inductor dual-output switching converter is composed of converter TD and switching tube S1、S2The control device of (1). The control device mainly comprises an output voltage ripple controller CTR1And CTR2And (4) forming. Output voltage ripple controller CTR1From the voltage detection circuit VS1Voltage amplifier VK1Reference voltage Vref1Error amplifier EAP1Comparator CMP1RS flip-flop TGR1Drive circuit DR1Clock signal CLK; output voltage ripple controller CTR2From the voltage detection circuit VS2Voltage amplifier VK2Reference voltage Vref2Error amplifier EAP2Comparator CMP2RS flip-flop TGR2Drive circuit DR2And a clock signal CLK. Wherein the voltage detection circuit VS1、VS2And voltage amplifier VK1、VK2Are respectively used for obtaining output voltage Voa、VobAnd amplified output voltage ripple Vk1、Vk2Error amplifier EAP1、EAP2For deriving reference voltage and reference current V, respectivelye1、Ve2Comparator CMP1、CMP2Are respectively used for acquiring the RS trigger TGR1、TGR2The R end of the clock signal CLK is used as an RS trigger TGR1、TGR2S terminal input signal of (1), RS flip-flop TGR1、TGR2The Q end output signal is used for obtaining the switching tube S1And S2Via the drive circuit DR1、DR2And controlling the on and off of a TD switching tube of the switching converter.
The converter TD of the embodiment is a single-inductor double-output Buck converter, and the working process and the principle are as follows:
the working process and principle of the control device adopting output voltage ripple control are as follows: FIG. 2 shows that at the start of any one cycle, the clock signal CLK causes the RS flip-flop TGR1、TGR2Set, RS flip-flop TGR1、TGR2The Q end signal passes through a driving circuit DR1、DR2Respectively controlling main switch tube S1And branch switching tube S2Is turned on. The control circuit is divided into two output voltage ripple control circuits, and the control circuit 1 samples the output voltage VoaAnd amplified output voltage ripple Vk1(ii) a Output voltage VoaAnd a reference voltage Vref1Is passed through an error amplifier EAP1Then obtaining a reference voltage Ve1；Vk1And Ve1By means of a comparator CMP1Comparing to obtain the TGR of the RS trigger1R end of the branch circuit is input with a signal to generate a branch circuit switch tube S1Is connected to the drive circuit DR1Input terminal of, DR1Is connected to the branch switch tube S1Gate control terminal of (1), control switch tube S1Is turned off. Control circuit 2 samples output voltage VobAnd amplified output voltage ripple Vk2(ii) a Output voltage VobAnd a reference voltage Vref2Is passed through an error amplifier EAP2Then obtaining a reference voltage Ve2；Vk2And Ve2By means of a comparator CMP2Comparing to obtain the TGR of the RS trigger2Input signal to generate main switch tube S2Is connected to the drive circuit DR2Input terminal of, DR2Is connected to the switching tube S2Gate control terminal of (1), control switch tube S2Is turned off. Because the capacitance parasitic resistance inevitably exists in the actual circuit, compared with the capacitance current ripple control technology, the invention does not need to meet the limit of the capacitance parasitic resistance and the sampling resistance which are extremely small, thereby reducing the quantity of output capacitance and simplifying the sampling circuit.
Fig. 3 is a diagram showing the operating timing and the inductor current waveform of the circuit operating in the inductor current continuous conduction mode when the single-inductor dual-output Buck converter is adopted. In the figure, at d1TsTime of dayInner, S1And S2On, D1And D2Off, inductor current through output branch a to charge slope (V)in-Voa) rising/L; in (d)2-d1)TsWithin time, S2And D2Conduction, S1And D1Off, inductor current through output branch b to charge slope (V)in-Vob) the/L continues to rise; in (1-d)2)TsWithin time, D1And D2Conduction, S1And S2Is turned off, and the inductive current passes through the output branch b to discharge with a slope-Vobthe/L falls until the circuit enters the next switching cycle.
Fig. 4 is a control timing chart of the control device. In the figure, at the start of each switching cycle, the clock signal CLK sets the flip-flops RS-trigger1, RS-trigger2 and the control signal d1、d2At a high level, the switch tube S1、S2Conducting, diode D1、D2Turning off; amplified output voltage ripple VK1Linearly rising, amplified output voltage ripple VK2The linearity decreases. When V isK1Up to a reference voltage Ve1When d is greater than1At a low level, the switch tube S1Turn-off, diode D2Naturally conducting, switching tube S2Remains on, diode D1Remains off, VK1Linear decrease, VK2And (4) increasing linearly. When V isK2Up to a reference voltage Ve2Time, control signal d2At a low level, the switch tube S2Turn-off, diode D1Conducting, switching tube S1Remains off, diode D2Is kept on, VK1Continue to decrease linearly, VK2The linear rise continues with another slope until the clock signal arrives and the converter enters the next switching cycle.
The PSIM simulation software is used for carrying out time domain simulation analysis on the method, and the result is as follows.
FIG. 5 shows the output voltage and output current of a single-inductor dual-output Buck converter under the condition of sudden load change of an output branch circuit by adopting peak current control and the implementation of the inventionFig. 5a and 5b respectively correspond to time-domain simulation waveforms of output voltage and output current when a load of an output branch a of the single-inductor dual-output Buck converter is controlled by peak current and dual-output voltage ripple, and fig. 5c and 5d respectively correspond to time-domain simulation waveforms of output voltage and output current when a load of an output branch b of the single-inductor dual-output Buck converter is controlled by peak current and dual-output voltage ripple. In fig. 5a and 5b, the peak current controls the output current I of the single-inductor dual-output Buck converter and the dual-output voltage ripple controls the output branch a of the single-inductor dual-output Buck converteroaSuddenly changing from 1A to 1.5A, and outputting the output current I of the branch circuit bobWhen the voltage is 2A, the peak current controls the output voltage V of the output branch a of the single-inductor double-output Buck converteroaEntering a new stable state after about 3.6ms, wherein the cross influence of the output branch a on the output branch b is 180 mV; the adjusting time of the single-inductor double-output Buck switching converter controlled by the double-output voltage ripples to enter a new steady state is about 0.2ms, and the cross influence of the output branch a on the output branch b is 20 mV. In fig. 5c and 5d, the peak current controls the output current I of the single-inductor dual-output Buck converter and the dual-output voltage ripple controls the output branch b of the single-inductor dual-output Buck converterobSuddenly changing to 2.5A from 2A, and outputting the output current I of the branch aoaWhen the voltage is 1A, the peak current controls the output voltage V of the output branch b of the single-inductor double-output Buck converterobEntering a new stable state after about 3.6ms, wherein the cross influence of the output branch b on the output branch a is 100 mV; the single-inductor double-output Buck converter controlled by the double-output voltage ripple enters a new stable state after about 0.2ms of regulation time, and the output branch b has almost no cross influence on the output branch a. Therefore, the switching converter has short transient regulation time, good load transient performance and small cross influence among output branches. The simulation condition of FIG. 5 is the input voltage Vin10V, voltage reference value Vref1＝3.3V、Vref25V, inductance L100 mu H, capacitance C1＝C2470 muf, parasitic resistance ESR1＝ESR220m omega, load resistance Ra＝3.3Ω、Rb＝2.5Ω。
In the invention, the converter TD can also be a single-inductor dual-output Boost converter, a single-inductor dual-output Buck-Boost converter or a single-inductor dual-output Bipolar converter.
Claims (3)
1. A single-inductor dual-output switch converter dual-output voltage ripple control method is characterized in that an output voltage ripple controller CTR1Detecting the output voltage V of the single-inductor dual-output switching converteroaAnd an output voltage ripple Vc1(ii) a Output voltage VoaAnd a voltage reference value Vref1Via error amplifier EAP1Generating an amplified error signal Ve1Sent to a comparator CMP1Negative input terminal of, output voltage ripple Vc1Amplified output voltage ripple Vk1Sent to a comparator CMP1The positive input end of (a); vk1And Ve1The comparison result is sent to the RS flip-flop TGR1R end of the control branch switch tube S1Turn off of (1); clock signal CLK is fed into RS flip-flop TGR1The S end of the control branch switch tube S1Conduction of (1); output voltage ripple controller CTR2Detecting the output voltage V of the single-inductor dual-output switching converterobAnd an output voltage ripple Vc2(ii) a Output voltage VobAnd a voltage reference value Vref2Via error amplifier EAP2Generating an amplified error signal Ve2Sent to a comparator CMP2Negative input terminal of, output voltage ripple Vc2Amplified output voltage ripple Vk2Sent to a comparator CMP2The positive input end of (a); vk2And Ve2The comparison result is sent to the RS flip-flop TGR2R end of the control branch switch tube S2Turn off of (1); clock signal CLK is fed into RS flip-flop TGR2The S end of the control branch switch tube S2Is turned on.
2. A single-inductance dual-output switch converter dual-output voltage ripple control device is characterized by comprising an output voltage ripple controller CTR1And CTR2(ii) a The output voltage ripple controller CTR1Comprising a voltage detection circuit VS connected in sequence1Error amplifier EAP1Comparator CMP1RS flip-flop TGR1And a drive circuit DR1And further comprising connecting to CMP1Voltage amplifier VK1，EAP1Is also connected with a reference voltage Vref1，TGR1Also connected to a clock signal CLK; the output voltage ripple controller CTR2Comprising a voltage detection circuit VS connected in sequence2Error amplifier EAP2Comparator CMP2RS flip-flop TGR2And a drive circuit DR2And further comprising connecting to CMP2Voltage amplifier VK2，EAP2Is also connected with a reference voltage Vref2，TGR2Also connected to a clock signal CLK; the VS1、VS2、VK1、VK2、DR1And DR2Respectively connected to the single-inductor dual-output switching converter.
3. The ripple control device of claim 2, wherein the single-inductor dual-output switching converter is a Buck converter, a Boost converter, a Buck-Boost converter, or a Bipolar converter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848397A (en) * | 2020-06-28 | 2021-12-28 | 中兴通讯股份有限公司 | Ripple detection device and ripple suppression device |
| CN115347781A (en) * | 2022-08-31 | 2022-11-15 | 陕西理工大学 | Design method of intrinsically safe single-inductor multi-output switch converter |
-
2020
- 2020-03-21 CN CN202010204036.7A patent/CN111211671A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848397A (en) * | 2020-06-28 | 2021-12-28 | 中兴通讯股份有限公司 | Ripple detection device and ripple suppression device |
| CN113848397B (en) * | 2020-06-28 | 2023-10-27 | 中兴通讯股份有限公司 | Ripple detection device and ripple suppression device |
| CN115347781A (en) * | 2022-08-31 | 2022-11-15 | 陕西理工大学 | Design method of intrinsically safe single-inductor multi-output switch converter |
| CN115347781B (en) * | 2022-08-31 | 2024-01-26 | 陕西理工大学 | Design method of intrinsically safe single-inductor multi-output switch converter |
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