CN115208197B - Conduction time expansion circuit of DC-DC buck converter - Google Patents
Conduction time expansion circuit of DC-DC buck converter Download PDFInfo
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- CN115208197B CN115208197B CN202210936967.5A CN202210936967A CN115208197B CN 115208197 B CN115208197 B CN 115208197B CN 202210936967 A CN202210936967 A CN 202210936967A CN 115208197 B CN115208197 B CN 115208197B
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- 238000005070 sampling Methods 0.000 claims abstract description 9
- 230000001939 inductive effect Effects 0.000 claims abstract description 7
- HCUOEKSZWPGJIM-YBRHCDHNSA-N (e,2e)-2-hydroxyimino-6-methoxy-4-methyl-5-nitrohex-3-enamide Chemical compound COCC([N+]([O-])=O)\C(C)=C\C(=N/O)\C(N)=O HCUOEKSZWPGJIM-YBRHCDHNSA-N 0.000 claims description 12
- 101001109689 Homo sapiens Nuclear receptor subfamily 4 group A member 3 Proteins 0.000 claims description 12
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- 101001067395 Mus musculus Phospholipid scramblase 1 Proteins 0.000 claims description 12
- 102100022673 Nuclear receptor subfamily 4 group A member 3 Human genes 0.000 claims description 12
- MZAGXDHQGXUDDX-JSRXJHBZSA-N (e,2z)-4-ethyl-2-hydroxyimino-5-nitrohex-3-enamide Chemical compound [O-][N+](=O)C(C)C(/CC)=C/C(=N/O)/C(N)=O MZAGXDHQGXUDDX-JSRXJHBZSA-N 0.000 claims description 9
- KIWSYRHAAPLJFJ-DNZSEPECSA-N n-[(e,2z)-4-ethyl-2-hydroxyimino-5-nitrohex-3-enyl]pyridine-3-carboxamide Chemical compound [O-][N+](=O)C(C)C(/CC)=C/C(=N/O)/CNC(=O)C1=CC=CN=C1 KIWSYRHAAPLJFJ-DNZSEPECSA-N 0.000 claims description 8
- 101150070189 CIN3 gene Proteins 0.000 claims description 6
- 101100286980 Daucus carota INV2 gene Proteins 0.000 claims description 6
- 101100397045 Xenopus laevis invs-b gene Proteins 0.000 claims description 6
- 101150110971 CIN7 gene Proteins 0.000 claims description 5
- 101150110298 INV1 gene Proteins 0.000 claims description 5
- 101100397044 Xenopus laevis invs-a gene Proteins 0.000 claims description 5
- 101100508840 Daucus carota INV3 gene Proteins 0.000 claims description 4
- HCUOEKSZWPGJIM-IYNMRSRQSA-N (e,2z)-2-hydroxyimino-6-methoxy-4-methyl-5-nitrohex-3-enamide Chemical compound COCC([N+]([O-])=O)\C(C)=C\C(=N\O)\C(N)=O HCUOEKSZWPGJIM-IYNMRSRQSA-N 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 6
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- 238000004088 simulation Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
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Classifications
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention belongs to the technical field of integrated circuits and switching power supplies, and particularly relates to a conduction time expansion circuit of a DC-DC buck converter. The on time and the end time realized by COT control are respectively determined by the inductive current sampling comparison output and OST (One Shot Timer), so that the control requirement of COT can be met when the circuit stably works, and the high-efficiency performance in light load is obtained. Meanwhile, the invention can realize the expansion of the conduction time in the step time of the load, thereby overcoming the defects of overlarge undershoot voltage, overlong response time and the like caused by constant conduction time in the step time of the load, ensuring the output voltage of the buck converter to be fast and stable and having better load response characteristic.
Description
Technical Field
The invention belongs to the technical field of integrated circuits and switching power supplies, and particularly relates to a conduction time control circuit of a COT (constant on time) -controlled DC-DC buck converter.
Background
With the development of semiconductor power integration technology, electronic mobile devices are widely applied to the fields of mobile phones, internet of things and the like. To meet the complex operating environment, long operating times, portable electronic devices require a fast transient response and high efficiency of the DC-DC converter. Fast transient response means that the output voltage can remain stable under load steps and high efficiency means that power and loss and quiescent current can be effectively controlled. The COT-controlled buck converter belongs to frequency conversion control, and can increase equivalent switching frequency when load is stepped, so that response speed is improved, and the COT-controlled buck converter is suitable for complex load conditions, as shown in a schematic diagram of the COT buck converter in fig. 1. The COT control converter can avoid subharmonic oscillation of peak current control, and can realize the stability of switching frequency through a pseudo-constant frequency technology; at light load, the converter frequency of the COT control is low, and high conversion efficiency can be realized. Since the on-time of the COT-controlled converter is a constant value, multiple duty cycles are required to achieve circuit adaptation to new load currents when a step on the load occurs in the circuit, which means a larger load response time, taking into account the shortest off-time. In addition, under the same load transient state, longer load response time means larger overshoot and undershoot voltage, so that the power supply voltage of the load circuit is unstable for a long time, and the load is seriously influenced.
Thus, for a COT controlled DC-DC buck converter, the high efficiency performance under light load is preserved, and the on-time control circuit focuses on how to improve the step response performance on the load of the COT buck converter.
Disclosure of Invention
The invention aims to provide a conduction time control circuit of a buck converter suitable for COT control, which ensures constant conduction time control under steady state conditions, can realize the great increase of conduction time when a step is carried out on a load of the converter and is longer than the designed COT time, thereby reducing undershoot voltage and response time of output voltage when the step is carried out on the load and improving transient performance of the load.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the on-time expansion circuit of the COT-controlled DC-DC buck converter comprises an error amplifier, an inductive current sampling circuit and a driving circuit, and further comprises an on-time expansion circuit, wherein the on-time expansion circuit is connected among the error amplifier, the inductive current sampling circuit and the driving circuit, and comprises a comparator COMP, a first inverter INV1, a second inverter INV2, a third inverter INV3, a fourth inverter INV4, a first NOR gate NOR1, a second NOR gate NOR2, a third NOR gate NOR3, a fourth NOR gate NOR4, a fifth NOR gate NOR5, a NAND gate NAND and an OST (one shot timer) module;
the positive input end of the comparator COMP is connected with the error amplifier output Vc, the negative input end of the comparator COMP is connected with the inductance current sampling output RAMP, and the output end of the comparator COMP is connected with one input of the first NOR gate NOR1 and one input of the fifth NOR gate NOR 5;
the input end of the OST module is connected with the output of the NAND gate and one input end of the third NOR gate NOR3, the output end of the OST module is connected with the input end of the first inverter INV1, and the output end of the first inverter is connected with the other input end of the first NOR gate NOR 1;
the output of the first NOR gate NOR1 is connected with one input of a second NOR gate NOR2, the other input of the second NOR gate NOR2 is connected with the output of a third NOR gate NOR3, and the output of the second NOR gate NOR2 is connected with the other input of the third NOR gate NOR3, the input of a second inverter INV2 and one input of a NAND gate NAND; the output of the second inverter INV2 is connected to one input of a fourth NOR gate NOR4, the other input of the fourth NOR gate NOR4 is connected to the output of a fifth NOR gate NOR5, the output of the fourth NOR gate NOR4 is connected to the other input of the fifth NOR gate NOR5, and the output of the fifth NOR gate NOR5 is connected to the input of a third inverter INV 3; the output of the third inverter INV3 is connected to the other input of the NAND gate NAND, the output of the NAND gate NAND is connected to the input of the fourth inverter INV4, and the output of the fourth inverter INV4 is connected to the Ton port.
The invention can ensure that the DC-DC buck converter has the advantage of COT (chip on board) when stably working, namely, the output under light load is high in efficiency; when the load is stepped, the circuit can realize the expansion of the conduction time, realize shorter load response time and realize smaller undershoot voltage.
Drawings
FIG. 1 is a schematic diagram of a COT controlled buck converter of the present invention;
FIG. 2 is a schematic diagram of an on-time expansion circuit;
FIG. 3 is a schematic diagram of a step down simulation of an on-time expansion converter load;
fig. 4 is a graph of a comparison of on-time expansion versus step down simulation of a converter load under COT control.
Detailed Description
Embodiments of the present invention will be described in detail with reference to the accompanying drawings. The invention opens the time circuit and the constant conduction time generation circuit according to the specific conduction time;
for fig. 1, a general schematic diagram of a COT buck converter, sampling inductor current through a DCR, and outputting with an error amplifier EAComparing to obtain turn-on time of T on Logic completes the generation of constant on-time, the content of the invention is T on The Logic module is a specific circuit in the dashed box in fig. 2.
In fig. 2, the voltage state of the circuit node when the on-time is extended is described in detail. In steady state, the first NOR gate NOR1 output is low, the second NOR gate NOR2 output is high, and the fifth NOR gate NOR5 output is high, depending on the previous Toff state. When the rising edge of the pulse output by the comparator COMP arrives, the output of the first NOR gate NOR1 is still low, the output of the fifth NOR gate NOR5 is low, so that the NAND gate NAND output is low, and the Ton output is high to enter the charging stage, during which the comparator outputs the falling edge of the pulse, and the Ton state is not changed; after constant on time, the rising edge of the pulse output by the OST module comes, the output of the first NOR gate NOR1 is high, the output of the second NOR gate NOR2 is low, after the NAND gate NAND, the output of Ton is low, and the on time is finished; then the pulse falling edge output by the OST module comes, the output of the comparator COMP is low, the output of the first NOR gate NOR1 is low, the output of the second NOR gate NOR2 is high, and the output of the fifth NOR gate NOR5 is high;
when the large load is in step, the output Vc of the error amplifier is increased, the sampling output RAMP of the inductive current is reduced, the high level width of the output pulse of the comparator COMP is increased, and the falling edge of the comparator COMP is delayed from the rising edge of the output pulse of the OST module; in fig. 2, the pulse rising edge of the OST module output is consistent with the normal COT time sequence, the COMP output still keeps high level at the moment of the pulse rising edge of the OST module output, the output of the first NOR gate NOR1 still keeps low level, the flip-flop composed of the second NOR gate NOR2 and the third NOR gate NOR3 is in a holding state, the output of the second NOR gate NOR2 keeps high, the Ton output is high, the on time is prolonged, and the high level width of the pulse output by the OST module is increased according to the circuit design; when the falling edge of the comparator COMP comes, the first NOR gate NOR1 is high, the second NOR gate NOR2 is low, the fifth NOR gate NOR5 outputs high level, the NAND gate NAND outputs high level, the Ton outputs low level to finish the conduction time, the falling edge of the OST output pulse after the delay enters the Toff stage;
for fig. 3, a schematic diagram of a step down simulation of the on-time expansion converter load; before 2ms, the load current of the converter 1A,2ms is subjected to load up-step, the amplitude is 3A, the rising time is 1ns, and the high-level duration of the switch node is obviously prolonged after the load step.
For fig. 4, a comparison of on-time expansion versus step-down simulation of a converter load for COT control, ton (extension) shows a buck converter employing an on-time expansion circuit, and COT shows a buck converter for general COT control; to ensure contrast stringency, external stimuli tested for different converters are kept consistent, load step amplitude is consistent with time; according to simulation results, when the converter carrying the extension circuit is in step on a load, the undershoot voltage is 80mA, the response time is 4.9us, and in contrast, the undershoot voltage on the load of the converter controlled by COT is 105us, and the response time is 18.5us; the larger the load step amplitude is, the more obvious the transient response optimization of the converter is.
The invention realizes COT control under normal operation, realizes conduction time expansion when the load is stepped, breaks through the limitation of constant conduction time, reduces undershoot voltage and response time, and improves transient response performance.
Claims (1)
1. The on-time expansion circuit of the DC-DC buck converter comprises an error amplifier, an inductive current sampling circuit and a driving circuit, and is characterized by further comprising an on-time expansion circuit, wherein the on-time expansion circuit is connected among the error amplifier, the inductive current sampling circuit and the driving circuit, and comprises a comparator COMP, a first inverter INV1, a second inverter INV2, a third inverter INV3, a fourth inverter INV4, a first NOR gate NOR1, a second NOR gate NOR2, a third NOR gate NOR3, a fourth NOR gate NOR4, a fifth NOR gate NOR5, a NAND gate NAND and an OST module;
the positive input end of the comparator COMP is connected with the output of the error amplifier, the negative input end of the comparator COMP is connected with the output of the inductive current sampling circuit, and the output end of the comparator COMP is connected with one input of the first NOR gate NOR1 and one input of the fifth NOR gate NOR 5;
the input end of the OST module is connected with the output of the NAND gate and one input end of the third NOR gate NOR3, the output end of the OST module is connected with the input end of the first inverter INV1, and the output end of the first inverter INV1 is connected with the other input end of the first NOR gate NOR 1;
the output of the first NOR gate NOR1 is connected with one input of a second NOR gate NOR2, the other input of the second NOR gate NOR2 is connected with the output of a third NOR gate NOR3, and the output of the second NOR gate NOR2 is connected with the other input of the third NOR gate NOR3, the input of a second inverter INV2 and one input of a NAND gate NAND; the output of the second inverter INV2 is connected to one input of a fourth NOR gate NOR4, the other input of the fourth NOR gate NOR4 is connected to the output of a fifth NOR gate NOR5, the output of the fourth NOR gate NOR4 is connected to the other input of the fifth NOR gate NOR5, and the output of the fifth NOR gate NOR5 is connected to the input of a third inverter INV 3; the output of the third inverter INV3 is connected to the other input of the NAND gate NAND, the output of the NAND gate NAND is connected to the input of the fourth inverter INV4, and the output of the fourth inverter INV4 is the output of the on-time expansion circuit and is connected to the driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210936967.5A CN115208197B (en) | 2022-08-05 | 2022-08-05 | Conduction time expansion circuit of DC-DC buck converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210936967.5A CN115208197B (en) | 2022-08-05 | 2022-08-05 | Conduction time expansion circuit of DC-DC buck converter |
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| Publication Number | Publication Date |
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| CN115208197A CN115208197A (en) | 2022-10-18 |
| CN115208197B true CN115208197B (en) | 2024-03-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103947092A (en) * | 2011-10-26 | 2014-07-23 | 美高森美公司 | Converter with hysteretic control |
| CN104377958A (en) * | 2014-11-27 | 2015-02-25 | 电子科技大学 | Transient response intensifier circuit for switching power supply |
| CN106169869A (en) * | 2016-07-18 | 2016-11-30 | 电子科技大学 | A kind of pseudo-pwm control circuit |
| CN114070055A (en) * | 2020-08-03 | 2022-02-18 | 茂达电子股份有限公司 | Power converter with fast transient response |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10340797B2 (en) * | 2017-11-30 | 2019-07-02 | Active-Semi, Inc. | Regulator control integrated circuit having COT and valley current modes |
| US10965215B2 (en) * | 2019-08-15 | 2021-03-30 | Microchip Technology Incorporated | Constant on-time buck converter with calibrated ripple injection having improved light load transient response and reduced output capacitor size |
-
2022
- 2022-08-05 CN CN202210936967.5A patent/CN115208197B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103947092A (en) * | 2011-10-26 | 2014-07-23 | 美高森美公司 | Converter with hysteretic control |
| CN104377958A (en) * | 2014-11-27 | 2015-02-25 | 电子科技大学 | Transient response intensifier circuit for switching power supply |
| CN106169869A (en) * | 2016-07-18 | 2016-11-30 | 电子科技大学 | A kind of pseudo-pwm control circuit |
| CN114070055A (en) * | 2020-08-03 | 2022-02-18 | 茂达电子股份有限公司 | Power converter with fast transient response |
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| CN115208197A (en) | 2022-10-18 |
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