CN108233712B - Decoupling compensation device and method for single-inductor double-output switch converter - Google Patents
Decoupling compensation device and method for single-inductor double-output switch converter Download PDFInfo
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- CN108233712B CN108233712B CN201810115183.XA CN201810115183A CN108233712B CN 108233712 B CN108233712 B CN 108233712B CN 201810115183 A CN201810115183 A CN 201810115183A CN 108233712 B CN108233712 B CN 108233712B
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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
- H02M3/1584—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 with a plurality of power processing stages connected in parallel
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Abstract
The output end of the first current detection circuit is connected to the first input end of the second subtracter through a first decoupling compensation network, and the output end of the second current detection circuit is connected to the first input end of the first subtracter through a fourth decoupling compensation network; the output end of the first compensation network is connected to the second input end of the second subtracter through a third decoupling compensation network, and the output end of the second compensation network is connected to the second input end of the first subtracter through the second decoupling compensation network; the output end of the first compensation network is also connected to the third input end of the first subtracter, and the output end of the second compensation network is also connected to the third input end of the second subtracter; the output of the first subtractor is connected to the input of the first control network and the output of the second subtractor is connected to the input of the second control network. The main power circuit and the control circuit of the single-inductor double-output switching converter are completely decoupled.
Description
Technical Field
The invention relates to the technical field of switching converters, in particular to a decoupling compensation device and a decoupling compensation method for a single-inductor double-output switching converter.
Background
With the rapid development of portable electronic products, the power supply of the portable electronic products is developed towards the directions of small volume, low cost, high efficiency and multiple outputs. The single-inductor multi-output switch converter realizes multi-output through one inductor, effectively reduces the volume of the converter, reduces the manufacturing cost and improves the conversion efficiency, and receives wide attention in academia and industry.
Taking a single-inductor dual-output switching converter as an example, the single-inductor dual-output switching converter can be divided into: intermittent conduction mode (discontinuous conduction mode, DCM), pseudo-continuous conduction mode (pseudo continuous conduction mode, PCCM) and continuous conduction mode (continuous conduction mode, CCM). The single-inductor double-output switch converter working in the DCM mode has no cross influence among output branches, but has large inductance current ripple and poor load carrying capacity; the single-inductor double-output switch converter working in the PCCM mode overcomes the defect of large inductance current ripple, but due to the introduction of a follow current stage, extra switching loss and conduction loss are added, and the efficiency of the converter is reduced; the single-inductor double-output switch converter working in CCM mode has small output voltage and inductance current ripple, strong load capacity and high conversion efficiency, but all output branches are coupled together through inductance current, when the load of one output branch is changed, the other output branch is influenced through inductance current, namely, the output branches have cross influence.
On the other hand, the switching tube of the output branch of the single-inductance double-output switching converter adopts a time division multiplexing technology, and the branch switching tube is complementarily conducted. When the load of one output branch circuit changes, the on-duty ratio of the switching tube of the output branch circuit is regulated through a feedback loop, and the on-duty ratio of the switching tube of the other output branch circuit also changes, so that the output voltage of the other output branch circuit changes, namely, the output branch circuits have cross influence.
Disclosure of Invention
The invention aims to provide a device and a method for inhibiting the cross influence among output branches of a single-inductor double-output switching converter, so as to eliminate the defect that the cross influence exists among the output branches when the single-inductor double-output switching converter works in a CCM mode, and the device and the method are applicable to single-inductor double-output switching converters with various topological structures and various control methods.
The technical scheme adopted by the invention for achieving the purpose is as follows:
a decoupling compensation device of a single-inductance double-output switching converter comprises a first decoupling compensation network T 11 Second decoupling compensation network T 21 Third decoupling compensation network T 12 Fourth decoupling compensation network T 22 A first subtractor SUB1 and a second subtractor SUB2; the output end of the first current detection circuit IS1 IS connectedT is exceeded 11 A first input terminal connected to the SUB2, and an output terminal of the second current detection circuit IS2 connected to the output terminal of the current detection circuit IS2 via T 22 A first input terminal connected to SUB 1; control loop first compensation network G c1 Through T 12 Connected to a second input of SUB2, a control loop second compensation network G c2 Through T 21 A second input terminal connected to SUB 1; g c1 The output terminal of (1) is also connected to the third input terminal of SUB1, G c2 The output of (2) is also connected to the third input of SUB2; the output of SUB1 is connected to a first control network G m1 The output of SUB2 is connected to the second control network G m2 Is provided.
A decoupling compensation method of a single-inductance double-output switch converter includes that at the beginning time of each switch period, load current of an output branch of a main power circuit of the single-inductance double-output switch converter IS detected through a first current detection circuit IS1 and a second current detection circuit I S respectively to obtain a signal i a (s) and i b (s); and respectively detect and obtain a first compensation network G of the control loop c1 And a control loop second compensation network G c2 Output signal v of (2) gc1 (s) and v gc2 (s); will i a (s) feeding into a first decoupling compensation network T 11 Obtaining signal v t11 (s) will be i b (s) feeding into a fourth decoupling compensation network T 22 Obtaining signal v t22 (s) mixing v gc1 (s) feeding into a third decoupling compensation network T 12 Obtaining signal v t12 (s) mixing v gc2 (s) feeding into a second decoupling compensation network T 21 Obtaining signal v t21 (s); will v gc1 (s)、v t21 (s) and v t22 (s) is fed into a first subtracter SUB1 to be subtracted to obtain a signal v c1 (s), i.e. v c1 (s)＝v gc1 (s)-v t21 (s)-v t22 (s); will v gc2 (s)、v t11 (s) and v t12 (s) is fed into a second subtracter SUB2 to be subtracted to obtain a signal v c2 (s), i.e. v c2 (s)＝v gc2 (s)-v t11 (s)-v t12 (s); will v c1 (s) and v c2 (s) respectively feeding into the first control network G m1 And a second control network G m2 And the main power circuit and the control circuit of the single-inductor double-output switching converter are completely decoupled.
Compared with the prior art, the invention has the beneficial effects that:
1. the decoupling compensation device and the decoupling compensation method are simple and reliable, and the main circuit and the control circuit realize complete decoupling.
2. The defect that the cross influence exists among output branches when the traditional single-inductor double-output switch converter works in a CCM mode is overcome.
3. When the input voltage is changed, the output voltage has small ripple variation, short regulating time and high transient response performance.
Drawings
Fig. 1 is a block diagram of a circuit structure of a decoupling compensation apparatus and method according to the present invention.
Fig. 2a is a schematic block diagram of a conventional voltage-controlled single-inductor dual-output buck converter.
Fig. 2b is a block diagram of a transfer function equivalent circuit of a conventional voltage-controlled single-inductor dual-output buck converter.
Fig. 3a is a schematic block diagram of a voltage-controlled single-inductor dual-output buck converter according to a first embodiment of the present invention.
Fig. 3b is a transfer function equivalent circuit block diagram of a voltage-controlled single-inductor dual-output buck converter according to a first embodiment of the present invention.
Fig. 4a is a time domain simulation waveform of output voltages of two output branches when a load of the output branch is hopped by a conventional voltage-controlled single-inductor dual-output buck converter.
Fig. 4b is a time domain simulation waveform of output voltages of two output branches when the load of the output branch is hopped by the single-inductor dual-output buck converter.
Fig. 5a is a time domain simulation waveform of output voltages of two output branches when a load of the b output branch is hopped by a conventional voltage-controlled single-inductor dual-output buck converter.
Fig. 5b is a time domain simulation waveform of output voltages of two output branches when the load of the output branch of the single-inductor dual-output buck converter of the present invention jumps.
Fig. 6a is a time domain simulation waveform of output voltages of two output branches when an input voltage jumps in a conventional voltage-controlled single-inductor dual-output buck converter.
Fig. 6b is a time domain simulation waveform of output voltages of two output branches when the input voltage of the single-inductor dual-output buck converter of the present invention jumps.
Fig. 7a is a schematic block diagram of a circuit structure of a common-mode-differential-mode voltage-type controlled single-inductor dual-output buck converter according to a second embodiment of the present invention.
Fig. 7b is a block diagram of an equivalent transfer function circuit of a common-mode-differential-mode voltage-type controlled single-inductor dual-output buck converter according to a second embodiment of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples.
Embodiment one:
fig. 1 shows that one embodiment of the present invention is: a decoupling compensation device and method for single-inductance double-output switch converter comprises a first current detection circuit IS1, a second current detection circuit IS2, and a first decoupling compensation network T 11 Second decoupling compensation network T 21 Third decoupling compensation network T 12 Fourth decoupling compensation network T 22 The first subtracter SUB1 and the second subtracter SUB2; at the beginning time of each switching period, detecting the load current of the output branch of the main power circuit to obtain a signal I a 、I b The method comprises the steps of carrying out a first treatment on the surface of the Detection control loop compensation network G c1 、G c2 To obtain a signal V gc1 、V gc2 The method comprises the steps of carrying out a first treatment on the surface of the Will I a Into a first decoupling compensation network T 11 Obtaining a signal V t11 The method comprises the steps of carrying out a first treatment on the surface of the Will I b Into a fourth decoupling compensation network T 22 Obtaining a signal V t22 The method comprises the steps of carrying out a first treatment on the surface of the Will V gc1 Into a third decoupling compensation network T 12 Obtaining a signal V t12 The method comprises the steps of carrying out a first treatment on the surface of the Will V gc2 Into a second decoupling compensation network T 21 (s) obtaining signal V t21 The method comprises the steps of carrying out a first treatment on the surface of the Will signal V gc1 And signal V t21 Signal V t22 Is fed to a first subtractor SUB1 to obtain a signal V c1 The method comprises the steps of carrying out a first treatment on the surface of the Will signal V gc2 And signal V t11 Signal V t12 Is fed to a second subtractor SUB2 to obtain a signal V c2 The method comprises the steps of carrying out a first treatment on the surface of the Will signal V c1 、V c2 Respectively sent to the control network G m1 、G m2 In the method, the main power circuit and the control circuit of the single-inductor double-output switch converter system are completely decoupled, and the cross influence among output branches is eliminated.
First decoupling compensation network T 11 Second decoupling compensation network T 21 Third decoupling compensation network T 12 And a fourth decoupling compensation network T 22 Transfer function T of (2) 11 (s)、T 21 (s)、T 12 (s)、T 22 And(s) is obtained by theoretical calculation. By carrying out small-signal modeling on a main power circuit of the single-inductance double-output switching converter, a cross-influence impedance transfer function Z of the main power circuit is deduced 12 (s)、Z 21 (s) control-output transfer function G 11 (s)、G 22 (s), and a control-coupling transfer function G 12 (s)、G 21 (s), the first decoupling compensation network T 11 (s), a second decoupling compensation network T 21 (s), a third decoupling compensation network T 12 (s), fourth decoupling compensation network T 22 Transfer function T of(s) 11 (s)、T 21 (s)、T 12 (s)、T 22 (s) are respectively:
for any control method of the single-inductor double-output switching converter, the closed loop control circuits of the control method are all a first voltage detection circuit VS1, a second voltage detection circuit VS2 and a first compensation network G c1 A second compensation network G c2 First control network G m1 And a second control network G m2 Composition is prepared.
The first decoupling compensation network T of the present invention 11 Second decoupling compensation network T 21 Third decoupling compensation netCollaterals T 12 And a fourth decoupling compensation network T 22 May be implemented by digital circuit programming.
Fig. 2a shows a schematic block diagram of a circuit structure of a conventional voltage-controlled single-inductor dual-output buck converter. Sampling the output voltage V of two output branches a 、V b Respectively pass through error amplifiers EA1 and EA2 and comparators CMP1 and CMP2 to generate control signals V for controlling the main switch tube and the branch switch tube p1 、V p2 、V p3 . Wherein the first compensation network G in the closed-loop control circuit c1 Consists of an error amplifier EA 1; second compensation network G c2 Consists of an error amplifier EA 2; first control network G m1 Consists of a first comparator CMP 1; second control network G m2 Consists of a second comparator CMP2 and an NOT gate NOT. Fig. 2b shows a transfer function equivalent circuit block diagram of a conventional voltage-controlled single-inductor dual-output buck converter, in which transfer functions in the main power circuit, the closed-loop control circuit 1 and the closed-loop control circuit 2 are all theoretically derived. Wherein: the transfer functions in the main power circuit are respectively: g 11 (S)、G 21 (s)、G 12 (s)、G 22 (s)、Z 11 (s)、Z 21 (s)、Z 12 (s)、Z 22 (s); the transfer functions in the closed-loop control circuit 1 are respectively: g m1 (s)、G c1 (s)、H v1 (s); the transfer functions in the closed-loop control circuit 2 are respectively: g m2 (s)、G c2 (s)、H v2 (s)。
Fig. 3 shows a schematic block diagram of a voltage-controlled single-inductor dual-output buck converter according to a first embodiment of the present invention. Fig. 3a and 3b correspond to a schematic circuit diagram and a transfer function equivalent circuit diagram, respectively (the short dashed box is a decoupling compensation device according to an embodiment of the present invention, compared to a conventional voltage-controlled single-inductor dual-output buck converter). The specific implementation mode is as follows: at the beginning time of each switching period, detecting the load current of the output branch of the main power circuit to obtain a signal i a (s)、i b (s); detecting the first compensation network G of the control loop c1 (s), a second compensation network G c2 The output of(s) to obtainSignal v gc1 (s)、v gc2 (s); will i a (s) feeding into a first decoupling compensation network T 11 (s) obtaining the signal v t11 (s); will i b (s) feeding into a fourth decoupling compensation network T 22 (s) obtaining the signal v t22 (s); will v gc1 (s) feeding into a third decoupling compensation network T 12 (s) obtaining the signal v t12 (s); will v gc2 (s) feeding into a second decoupling compensation network T 21 (s) obtaining the signal v t21 (s); signal v gc1 (s) AND signal v t21 (s) Signal v t22 (s) subtracting to obtain a signal v c1 (s), i.e. v c1 (s)＝v gc1 (s)-v t21 (s)-v t22 (s); signal v gc2 (s) AND signal v t11 (s) Signal v t12 (s) subtracting to obtain a signal v c2 (s), i.e. v c2 (s)＝v gc2 (s)-v t11 (s)-v t12 (s); signal v c1 (s)、v c2 (s) first control network G respectively fed into single-inductance double-output switch converter m1 (s), a second control network G m2 In(s), the main power circuit and the control circuit of the converter system are completely decoupled, and the cross influence among output branches is eliminated.
The time domain analysis of the method of this example was performed using MATLAB simulation software, with the following results.
FIG. 4 shows the output current i of the output branch (a) of the single-inductor dual-output switching converter with voltage control according to the present invention and conventional method a From 1A-2A-1A), the two output branches output voltage in a time domain simulation waveform, and fig. 4a and fig. 4b correspond to the conventional voltage control and the present invention respectively. The load of the a output branch is increased in 0.1s, and the load current is changed from 1A step to 2A; at 0.2s the load on the a output branch is relieved and the load current is changed from 2A to 1A in steps. As can be seen by comparing fig. 4a and fig. 4 b: the traditional voltage-controlled single-inductor double-output switch converter is adopted, when the load of an a output branch is loaded and unloaded, the output voltages of the a branch and the b branch are changed, namely, the load change of the a output branch has influence on the output voltage of the branch, and the load change of the a output branch has influence on the b output voltageThe output voltage of the output branches has influence, and the output branches have cross influence; when the invention is adopted, the load of the output branch is jumped, the output voltage of the output branch is changed, and the output voltage of the output branch is not changed, namely, the load change of the output branch only has influence on the output voltage of the output branch, and the load change of the output branch has no influence on the output voltage of the output branch. It can be seen from this: the single-inductor double-output switching converter has no cross influence on the branch b when the load of the branch a changes. Simulation conditions: input voltage V g =20v, voltage reference value V ref-a ＝12V、V ref-b =5v, a branch output current i a Branch output current i=1A, b b ＝1A。
FIG. 5 shows the output current i of the output branch (b) of the single-inductor dual-output switching converter with voltage control according to the present invention and conventional method b From 1A-2A-1A), the two output branches output voltage in a time domain simulation waveform, and fig. 5a and 5b correspond to the conventional voltage control and the present invention respectively. The load of the b branch is increased at 0.1s, and the load current is changed from 1A step to 2A; at 0.2s the load on the b-branch is relieved and the load current is changed from 2A step to 1A. As can be seen by comparing fig. 5a and 5 b: when the load of the b output branch is loaded and unloaded, the output voltages of the b branch and the a branch are changed, namely, the load change of the b output branch has influence on the output voltage of the branch and the output voltage of the a output branch, and the output branches have cross influence; when the invention is adopted, the load of the output branch is jumped, the output voltage of the output branch is changed, the output voltage of the output branch is not changed, namely, the load change of the output branch only has influence on the output voltage of the output branch, and the load change of the output branch has no influence on the output voltage of the output branch. It can be seen from this: the single-inductor double-output switching converter has no cross influence on the branch a when the load of the branch b changes.
As can be seen from fig. 4 and fig. 5, the single-inductor dual-output switching converter of the present invention has no influence on the output of one output branch when the load of the other output branch jumps, i.e. no cross influence exists between the output branches.
FIG. 6 shows the input voltage V when the input voltage jumps (input voltage V) g From 20V-30V-20V), and the two output branches output voltage in a time domain simulation waveform, fig. 6a and 6b correspond to the conventional voltage control and the present invention, respectively. The input voltage increases at 0.1s, changing from a 20V step to 30V; at 0.2s the input voltage decreases from a 30V step change to 20V. As can be seen by comparing fig. 6a and 6 b: when the input voltage increases and decreases, the output voltage V of the a branch and the b branch of the traditional voltage-controlled single-inductor double-output switching converter is adopted a 、V b The steady state can be re-entered after a period of time, and the transient variation of the output voltage is large; the single-inductor double-output switch converter adopts the output voltage V of the a branch and the b branch of the single-inductor double-output switch converter a 、V b The steady state is quickly re-entered, and the transient variation of the output voltage is small. It can be seen from this: the single-inductor double-output switching converter has the advantages of good input transient performance, short regulating time, small output voltage transient variation and strong input fluctuation resistance. The simulation conditions are identical to those of fig. 4.
Embodiment two:
the schematic block diagram of the second embodiment of the present invention is shown in fig. 7, and fig. 7a and 7b correspond to the schematic block diagram of the circuit structure and the equivalent circuit block diagram of the transfer function respectively (the short dashed box is a control device for increasing the common-mode-differential mode voltage type control compared with the conventional common-mode-differential mode voltage type control single-inductor dual-output buck converter). The second embodiment is substantially the same as the first embodiment except that: the control method adopted by the embodiment is common mode-differential mode voltage type control, wherein the on and off of the main switching tube are controlled by sampling two paths of output common mode signals, and the on and off of the branch switching tube are controlled by sampling two paths of output differential mode signals; and the specific expression of the transfer function in the closed-loop control circuit obtained by theoretical derivation is different.
The invention can be used for the switch converter and the control method in the embodiment, and can also be used for a single-inductor double-output Boost converter and a single-electricity converterMultiple multi-output circuit topologies such as inductance-double-output Buck-Boost converter, single-inductance-double-output f/y-back converter and the like, voltage type control, current type control and V type control 2 Control, etc.
Claims (2)
1. A decoupling compensation device of a single-inductance double-output switching converter is characterized in that: comprising a first decoupling compensation network T 11 Second decoupling compensation network T 21 Third decoupling compensation network T 12 Fourth decoupling compensation network T 22 A first subtractor SUB1 and a second subtractor SUB2; the output end of the first current detection circuit IS1 passes through T 11 A first input terminal connected to the SUB2, and an output terminal of the second current detection circuit IS2 connected to the output terminal of the current detection circuit IS2 via T 22 A first input terminal connected to SUB 1; control loop first compensation network G c1 Through T 12 Connected to a second input of SUB2, a control loop second compensation network G c2 Through T 21 A second input terminal connected to SUB 1; g c1 The output terminal of (1) is also connected to the third input terminal of SUB1, G c2 The output of (2) is also connected to the third input of SUB2; the output of SUB1 is connected to a first control network G m1 The output of SUB2 is connected to the second control network G m2 Is provided.
2. The decoupling compensation method of the apparatus of claim 1, wherein: at the beginning time of each switching period, the load current of the output branch of the main power circuit of the single-inductance double-output switching converter IS detected by a first current detection circuit IS1 and a second current detection circuit IS2 respectively to obtain a signal i a (s) and i b (s); and respectively detect and obtain a first compensation network G of the control loop c1 And a control loop second compensation network G c2 Output signal v of (2) gc1 (s) and v gc2 (s); will i a (s) feeding into a first decoupling compensation network T 11 Obtaining signal v t11 (s) will be i b (s) feeding into a fourth decoupling compensation network T 22 Obtaining signal v t22 (s) mixing v gc1 (s) Into a third decoupling compensation network T 12 Obtaining signal v t12 (s) mixing v gc2 (s) feeding into a second decoupling compensation network T 21 Obtaining signal v t21 (s); will v gc1 (s)、v t21 (s) and v t22 (s) is fed into a first subtracter SUB1 to be subtracted to obtain a signal v c1 (s), i.e. v c1 (s)＝v gc1 (s)-v t21 (s)-v t22 (s); will v gc2 (s)、v t11 (s) and v t12 (s) is fed into a second subtracter SUB2 to be subtracted to obtain a signal v c2 (s), i.e. v c2 (s)＝v gc2 (s)-v t11 (s)-v t12 (s); will v c1 (s) and v c2 (s) respectively feeding into the first control network G m1 And a second control network G m2 And the main power circuit and the control circuit of the single-inductor double-output switching converter are completely decoupled.
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| CN116488459B (en) * | 2023-06-25 | 2023-09-01 | 西安矽源半导体有限公司 | Self-adaptive digital compensation control method and system for buck converter |
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| 恒定导通时间控制单电感双输出CCM Buck变换器;王瑶;;电气工程学报(第09期);全文 * |
| 电流型控制单电感双输出开关变换器稳定性与瞬态特性分析;周述晗;周国华;毛桂华;张凯暾;徐顺刚;;电工技术学报(第06期);全文 * |
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| CN108233712A (en) | 2018-06-29 |
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