CN110739845B - Switch converter for improving transient performance of variable-frequency current type control - Google Patents
Switch converter for improving transient performance of variable-frequency current type control Download PDFInfo
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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
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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
- H02M3/1566—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 means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a switch converter with improved frequency conversion current type control transient performance, which is characterized in that a detected output voltage signal and a reference voltage signal generate a voltage ring error signal through an active integral voltage outer ring error amplifier, the voltage ring error signal is compared with capacitance current of the switch converter through a comparator to obtain one path of control signal of an RS trigger, the other path of control signal of the RS trigger is provided by a timer with fixed conduction time, and the output voltage and the output current of the switch converter are adjusted by controlling a driving circuit and controlling a power switch tube of the switch converter. The control idea is that an active integration circuit is used for replacing a passive integration capacitor in the traditional proportional-integral (PI) as a voltage outer ring of the variable-frequency current mode control technology, so that the limitation of the traditional linear compensation network on the dynamic response speed of the variable-frequency current mode control technology is solved, and the transient response speed of a load is improved.
Description
Technical Field
The invention relates to the technical field of switching power supply equipment, in particular to a switching converter with improved variable-frequency current mode control transient performance.
Background
With the increasing popularity of electronic products, power supplies are an important component as a power source for various electronic devices. The traditional linear power supply can not meet the requirements of high-performance electronic products, particularly the requirements of high and new technology industries such as communication, microelectronics, aerospace and the like on power supply technology are higher and higher, and the switching power supply has the advantages of small volume, light weight, high efficiency and the like, so that the switching power supply has great attention of academic and engineering circles and becomes a most active branch in the field of power electronics. However, as electronic products become more powerful, higher and higher requirements are placed on the operating performance, especially the transient performance, of the switching power supply.
The switch power supply mainly comprises a switch power converter and a control circuit, wherein the switch power converter utilizes a power switch device to realize the transmission and conversion of electric energy, and the control circuit controls a control variable according to target requirements. Common switching power converter topological structures include a Buck converter, a Boost converter, a Buck-Boost converter, a forward converter, a flyback converter and the like. The control circuit can detect the change of the control quantity (such as inductive current and output voltage) of the switching power converter, and accordingly generates corresponding pulse signals to control the working state of a power switching device of the switching power converter, so that the energy transmitted to a load is adjusted, and the stable output of the switching power converter is realized. The structure and operating principle of the control circuit are determined by the control method employed by the switching power converter. For a given switching converter topology, different control methods are adopted to have different influences on the steady-state accuracy, the dynamic performance and the like of the system. The topology of a switching power converter is often fixed for a given application, and therefore the design of the control circuit largely determines the operating performance of the switching power supply.
The traditional variable-frequency current type control technology is a widely-applied and deeply-researched control mode of a switching converter, is easy to realize the advantages of overcurrent protection, current sharing of a plurality of switching converters in parallel connection and the like, and is applied to various electronic products. In addition, compared with the conventional voltage-type control, the current-type control has better transient performance, but cannot be adapted to some occasions with higher requirements. Therefore, there is a need for an improvement of the conventional variable current mode control technique.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a switching converter with improved transient performance of variable-frequency current mode control, and the control idea of the novel variable-frequency current mode control technology with an active integral voltage outer ring is as follows: the active integration circuit is used for replacing a passive integration capacitor in the traditional proportional-integral (PI) as a voltage outer ring of the variable-frequency current mode control technology, the limitation of the traditional linear compensation network on the dynamic response speed of the variable-frequency current mode control technology is solved, and therefore the transient response speed of the load is improved.
The technical scheme adopted for solving the technical problems is as follows: a switching converter for improving transient performance of variable frequency current mode control, comprising a power circuit and a controller for a switching power supply, wherein the power circuit comprises a switching power converter; the controller comprises a voltage detection device, a reference voltage, an active integral voltage outer ring error amplifier, an inductive current sampling device, a comparator, an RS trigger, a conduction timer and a driving circuit, wherein the voltage detection device detects an output voltage signal of the switching power converter, the detected output voltage signal and the reference voltage signal generate a voltage ring error signal through the active integral voltage outer ring error amplifier, the voltage ring error signal is compared with a capacitance current of the switching power converter collected by the inductive current sampling device through the comparator, the comparator outputs one path of control signal as the RS trigger, the conduction timer provides the other path of control signal for the RS trigger, and the RS trigger controls a power switching tube of the switching power converter through the driving circuit to adjust the output voltage and the output current of the switching power converter.
Compared with the prior art, the invention has the beneficial effects that: the transient response performance of the load of the switching converter is improved. The active integration circuit is used for replacing a passive integration capacitor in the traditional proportional-integral (PI) as a voltage outer ring of the variable-frequency current mode control technology, the limitation of the traditional linear compensation network on the dynamic response speed of the variable-frequency current mode control technology is solved, and therefore the transient response speed of the load is improved.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a block diagram of a control system implementing apparatus of the present invention;
FIG. 2 is a schematic circuit diagram according to an embodiment of the present invention;
FIG. 3 is a time domain simulation waveform diagram of the embodiment of the present invention and a conventional variable frequency current mode control Buck converter when the output current jumps; wherein (a) the output current waveform; (b) the output voltage waveform of the conventional variable-frequency current type control Buck converter; (c) the method controls the output voltage waveform of the Buck converter.
FIG. 4 is a time domain simulation waveform diagram of the variable frequency current mode control Buck converter according to the embodiment of the present invention and the conventional variable frequency current mode control Buck converter during negative jump of output current; wherein (a) the output current waveform; (b) the output voltage waveform of the conventional variable-frequency current type control Buck converter; (c) the method controls the output voltage waveform of the Buck converter.
In the figure: 1. the circuit comprises an input device, 2, a switching device, 3, a filtering device, 4, an output device, 5, a voltage detection device, 6, a reference voltage, 7, an active integral voltage outer ring error amplifier, 8, an inductive current sampling device, 9, a comparator, 10, an RS trigger, 11, a conduction timer, 12 and a driving circuit.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
As shown in fig. 1, a switching converter of the present invention for improving transient performance of variable frequency current mode control includes a power circuit and a controller for the switching converter. In the figure, the power circuit is arranged outside the dashed line frame and comprises: an input device 1, a switch device 2, a filter device 3 and an output device 4; connection relation: the input device 1 is connected to the switch device 2, and is transmitted to the filter device 3 after passing through the switch device 2, and enters the output device 4 after passing through the filter device 3. Within the dashed box is a controller comprising: the circuit comprises a voltage detection device 5, a reference voltage 6, an active integral voltage outer ring error amplifier 7, an inductive current sampling device 8, a comparator 9, an RS trigger 10, a conduction timer 11 and a drive circuit 12; connection relation: the voltage detection device 5 and the reference voltage 6 connected to the output device 4 are respectively connected with two input ends of an active integral voltage outer ring error amplifier 7; the inductive current sampling device 8 connected to the filter device 3 and the output end of the active integral voltage outer-loop error amplifier 7 are respectively connected with two input ends of a comparator 9, the output end of the comparator 9 is connected with one input end of an RS trigger 10, and the other input end of the RS trigger 10 is connected with a conduction timer 11; the Q output end of the RS flip-flop 10 is connected to the driving circuit 12, and the driving circuit 12 is used for controlling the on/off of the switching device 2. The on-time of the on-timer 11 is preferably a fixed on-time.
Fig. 2 shows a schematic circuit structure of an embodiment of the present invention, wherein the input device 1 is a device for providing an input voltage, a battery is used as an input signal, and the input voltage is VinThe range of the voltage can be selected from 10V to 20V, and a lithium battery or a storage battery and the like can be adopted; the switching device 2 can adopt a field effect transistor, a triode and the like, and a switching tube S is adopted as the switching device 2 in the embodiment, and the type IRF540 is preferred; the filter device 3 may adopt a low-pass filter composed of an inductor and a capacitor or a filter composed of a single inductor, in this embodiment, a low-pass filter composed of an inductor and a capacitor is adopted as the filter device 3; the output device 4 can adopt a power resistor, a super capacitor, a microprocessor, an LED or the like, and the power resistor R is adopted as the output device 4 in the embodiment, and the range of the power resistor R is 0.5-10 omega; the voltage detection device 5 is used for detecting output voltage, and a voltage follower built by an operational amplifier is adopted as the voltage detection device 5; the reference voltage 6 can be provided by an auxiliary power supply or a voltage stabilizing chip, and the voltage stabilizing chip is adopted to provide the reference voltage 6 in the embodiment, preferably 78L 05; the active integral voltage outer ring error amplifier 7 is used for improving the output voltage signal and improving the stability and transient performance, and two operational amplifiers and a capacitor C are adopted in the embodimentM1And a resistance RM1、RM2And RinThe built integral compensator is used as an active integral voltage outer ring error amplifier 7; a differential amplification circuit built by an operational amplifier is used as an inductive current sampling device 8; the comparator 9 adopts a chip LM 319; the variable frequency controller is composed of a conduction timer 11 and an RS trigger 10, wherein the conduction timer 11 adopts a commonly used timing circuit in a switching power supply; the RS flip-flop 10 employs a 4-way 2-input nor gate, preferably of the type 74HC 02; the driving circuit 12 may adopt a driving chip such as IR2125 or IR2110, and in this embodiment, an integrated driving chip is adopted as the driving circuit 12, preferably model IR 2125.
When the switch tube S is conducted, the inductive current sampling signal RsiLAnd starts to rise. Warp beamOver-fixed on-time TONAfter that, the on timer 11 is turned off, RsiLAnd begins to fall. At the sampling time, the output voltage v to be detected is detected by the voltage detection device 5oAnd a reference voltage VrefGenerating a control signal v via an active integrating voltage outer loop error amplifier 7con. When current sampling signal RsiLDown to the control signal vconWhen the switch tube S is turned on again, the comparator 9 outputs a high level, the RS flip-flop 10 is set, and the Q terminal of the RS flip-flop 10 outputs a high level, so that the switch tube S enters the next switching period.
And (3) simulation result analysis:
fig. 3 is a time domain simulation waveform diagram of a Buck converter controlled by a conventional variable-frequency current mode control and the method of the present invention respectively by using PSIM software, wherein the simulation conditions are as follows: input voltage Vin12V, output voltage Vo＝Vref5V, 50 muH of inductance L, 470 muF of capacitance C, 15 mOmega of capacitance equivalent series resistance R, 4 omega of load R, and current detection coefficient Rs1V/A, fixed on-time TON＝2.5μs。
Fig. 3 shows that (a), (b) and (c) correspond to the output current signal, the output voltage of the conventional variable-frequency current-mode control Buck converter and the output voltage of the Buck converter controlled by the method of the present invention, respectively. The horizontal axes of the partial graphs (a), (b), and (c) are all time (ms), and the vertical axis of (a) is the output voltage (V) of the output current signals (a), (b), and (c). In fig. 3, in the partial graph (a), at 14.5ms, the output current signal jumps from 1.25V to 3.25V; as can be seen from the partial diagram (b), the impulse of the output voltage of the conventional variable-frequency current mode control Buck converter is 0.085V, and the recovery time required for entering a new steady state from an original steady state is about 0.25 ms; as can be seen from the partial diagram (c), the impulse of the Buck converter controlled by the method is very small and is 0.043V, and the recovery time required for entering the new steady state from the original steady state is very short and can be almost ignored. Therefore, when the output current signal generates positive jump, the transient performance of the method is obviously superior to that of the traditional variable-frequency current mode control technology.
Fig. 4 is a time domain simulation waveform diagram of the Buck converter controlled by the conventional variable frequency current mode control and the method of the present invention when the output current is in a negative jump state. The horizontal axes of the partial graphs (a), (b), and (c) are all time (ms), and the vertical axis of (a) is the output voltage (V) of the output current signals (a), (b), and (c). In fig. 4, in the partial graph (a), at 14.5ms, the output current signal jumps from 1.25V to 0.25V; as can be seen from the partial diagram (b), the impulse of the output voltage of the conventional variable-frequency current type control Buck converter is 0.044V, and the recovery time required for entering a new steady state from an original steady state is about 0.29 ms; as can be seen from the partial diagram (c), the impulse of the Buck converter controlled by the method is very small, 0.014V, and the recovery time required for entering the new steady state from the original steady state is very short and can be almost ignored. Therefore, when the output current signal generates negative jump, the transient performance of the method of the invention is obviously superior to that of the traditional variable-frequency current mode control technology.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (1)
1. A switching converter for improving transient performance of variable frequency current mode control, comprising: the power circuit comprises a power circuit and a controller for a switching power supply, wherein the power circuit comprises a switching power converter; the controller comprises a voltage detection device, a reference voltage, an active integral voltage outer ring error amplifier, an inductive current sampling device, a comparator, an RS trigger, a conduction timer and a driving circuit, wherein the active integral voltage outer ring error amplifier comprises two operational amplifiers, a capacitor CM1And a resistance RM1、RM2And RinWherein the resistance RinOne end of the output voltage signal is connected with the output voltage signal, and the other end of the output voltage signal is connected with the output voltage signalM1And the negative input terminal of the first operational amplifier, the positive input terminal of the first operational amplifier being connected to the reference signal VrefResistance RM1The other end of the first operational amplifier is connected with the negative input end of the second operational amplifier and the capacitor CM1A positive input terminal of the second operational amplifier is grounded, and a capacitor CM1The other end of the first operational amplifier is connected with the output end of the second operational amplifier and the resistor RM2One end of (A) RM2The other end of the voltage loop is connected with the output end of the first operational amplifier, the output end of the first operational amplifier generates a voltage loop error signal, the voltage detection device detects an output voltage signal of the switching power converter, the detected output voltage signal and a reference voltage signal generate a voltage loop error signal through the active integral voltage outer ring error amplifier, the voltage loop error signal is compared with a capacitance current of the switching power converter collected by the inductive current sampling device through a comparator, the comparator outputs one path of control signal as an RS trigger, the turn-on timer provides the other path of control signal for the RS trigger, and the RS trigger controls a power switching tube of the switching power converter through the driving circuit to adjust the output voltage and the output current of the switching power converter.
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| CN111431388B (en) * | 2020-04-17 | 2022-05-20 | 常州大学 | Control device capable of improving transient performance of variable-frequency ripple control |
| CN113381594B (en) * | 2021-05-28 | 2022-05-17 | 常州大学 | Current ripple feedforward control system for improving stability of cascade power device |
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| CN106094508A (en) * | 2016-06-07 | 2016-11-09 | 西北工业大学 | The voltage compensator method for designing of digital control switch regulated power supply based on δ operator |
| CN108445947A (en) * | 2018-05-21 | 2018-08-24 | 广州大学 | A kind of fast transient response circuit applied to DC-DC converter chip |
| CN109768703A (en) * | 2019-03-07 | 2019-05-17 | 常州大学 | A kind of frequency conversion Average Current Control device and method based on output voltage feedback |
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| CN106094508A (en) * | 2016-06-07 | 2016-11-09 | 西北工业大学 | The voltage compensator method for designing of digital control switch regulated power supply based on δ operator |
| CN108445947A (en) * | 2018-05-21 | 2018-08-24 | 广州大学 | A kind of fast transient response circuit applied to DC-DC converter chip |
| CN109768703A (en) * | 2019-03-07 | 2019-05-17 | 常州大学 | A kind of frequency conversion Average Current Control device and method based on output voltage feedback |
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Application publication date: 20200131 Assignee: Changzhou Ruixinteng Microelectronics Co.,Ltd. Assignor: CHANGZHOU University Contract record no.: X2023980054127 Denomination of invention: A Switching Converter for Improving Transient Performance of Variable Frequency Current Mode Control Granted publication date: 20210129 License type: Common License Record date: 20231227 |
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