CN102931838A - Slope compensation method for voltage-type hysteresis loop control switching converter and device thereof - Google Patents
Slope compensation method for voltage-type hysteresis loop control switching converter and device thereof Download PDFInfo
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- CN102931838A CN102931838A CN2012104600782A CN201210460078A CN102931838A CN 102931838 A CN102931838 A CN 102931838A CN 2012104600782 A CN2012104600782 A CN 2012104600782A CN 201210460078 A CN201210460078 A CN 201210460078A CN 102931838 A CN102931838 A CN 102931838A
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Abstract
The invention relates to a slope compensation method for a voltage-type hysteresis loop control switching converter and a device thereof. The method disclosed by the invention comprises the following steps: on the basis of the voltage-type hysteresis loop control, introducing an inductive current signal serving as a slope compensation of the voltage-type hysteresis loop control; subtracting the slope compensation from an upper limit reference voltage to obtain an upper-limit voltage; adding a lower-limit reference voltage with the slope compensation to obtain a lower-limit voltage; and according to the comparison condition of an output voltage and the upper and lower limit voltages, controlling the on/off of a main circuit switching device by a controller. The on/off time can be changed according to the comparison condition so as to implement the slope compensation control of the voltage-type hysteresis loop control switching converter. Due to the adoption of the slope compensation method, the dependence of the voltage-type hysteresis loop control switching converter on the characteristic of an output capacitor is reduced, the influence of a phase of a phase lag inductive current of the output voltage on the voltage-type hysteresis loop control is eliminated and the output voltage is effectively controlled in upper and lower limit voltage loops, so that the steady accuracy of the voltage-type hysteresis loop control is improved.
Description
Technical field
The present invention relates to slope compensation control method and the device thereof of the stagnant ring of voltage-type control switch power inverter.
Background technology
Along with the high speed development of power electronic technology, power electronic equipment and people's work, the relation of life are day by day close, and electronic equipment all be unable to do without reliable power supply.Because Switching Power Supply has the advantage of the aspects such as efficient is high, volume is little with respect to the conventional linear stabilized voltage power supply, so that switch power technology becomes the focus of people's application and research gradually.The develop rapidly of power electronic device provides a very large development space to Switching Power Supply especially, makes it little towards volume, and lightweight, efficient is high, and the large future development that waits of power density causes insider's extensive concern, has a extensive future.Switching Power Supply mainly is made of power inverter and controller two parts.Power inverter is called again power circuit, mainly comprises switching device, device for transformer and current rectifying and wave filtering circuit.Common power inverter topological structure has Buck converter (buck converter), Boost converter (booster converter), Buck-Boost converter (buck-boost converter), forward converter, anti exciting converter etc.Controller can input or output the variation of voltage by the detection power translation circuit, and produces accordingly the operating state of respective switch signal controlling power conversion circuit switching device, exports with the stable switch power supply thereby regulate the energy that passes to load.The structure of controller and operation principle are determined by the control method that Switching Power Supply adopts.For same power circuit topology, adopts different control methods to exert an influence to the stable state accuracy of system, dynamic property and the aspect such as stable, thereby the research of control method seem and become more and more important.The voltage-type of Switching Power Supply stagnates and encircles control, because its good load transient response and simple control circuit structure are widely used in industrial production.Yet the control performance of the stagnant ring control of voltage-type is subjected to the impact of output capacitance characteristic (such as equivalent series resistance) very large.
The voltage-type of Switching Power Supply stagnates and encircles control technology is the variable Switching Power Supply modulator approach of a kind of switching frequency, also is a kind of control method based on output voltage ripple.Its control thought is: utilize two comparators that output voltage is compared with the upper and lower limit reference voltage respectively, when output voltage rises to upper limit reference voltage, the comparator output high level that joins with the upper limit reference voltage rest-set flip-flop that resets turn-offs switching device, and output voltage descends; When output voltage drops to the lower limit reference voltage, comparator output high level set rest-set flip-flop with the lower limit reference voltage joins makes the switching device conducting, and output voltage rises, thereby the control output voltage is realized the control to output voltage and ripple thereof in bound reference voltage ring.Generally speaking, in order to improve the working life of Switching Power Supply, the non-aluminum electrochemical capacitor of the normal employing of output filter capacitor, such as ceramic condenser etc., its equivalent series impedance is less, can't overcome because output voltage ripple phase place hysteresis inductive current phase place causes output voltage to exceed the bound Voltage loop, thereby cause system out of control, bad steady state accuracy, output voltage and inductive current ripple are large, thereby have limited to a great extent the integrated of control circuit and popularization.
Summary of the invention
The purpose of this invention is to provide a kind of the improvements on switching power supply control method, by introducing suitable slope compensation voltage, make it to overcome the above shortcoming of prior art.
The present invention is on voltage-type stagnates ring control basis, introduce inductor current signal as the slope compensation of the stagnant ring control of voltage-type, upper limit reference voltage is deducted slope compensation as upper voltage limit, the lower limit reference voltage is added that slope compensation is as lower voltage limit, according to the comparable situation of output voltage and upper and lower limit voltage, conducting and the shutoff of controller control main circuit switch device.The turn-on and turn-off time is variable according to comparable situation, thereby realizes the slope compensation control that voltage-type stagnates and encircles the control switch converter.
Concrete technical scheme of the present invention is: a kind of voltage-type stagnates and encircles the slope compensation method of control switch converter, is by voltage sampling circuit, and the output voltage of sampled power converter feeds back to respectively two comparators; Pass through simultaneously current sampling circuit, the inductor current signal of sampled power converter, feed back to respectively subtracter and adder, the inductor current signal and the upper limit reference voltage that feed back to subtracter subtract each other the generation upper voltage limit, and the inductor current signal and the addition of lower limit reference voltage that feed back to adder produce lower voltage limit; Output voltage is relatively controlled the output voltage limit value through comparator and upper voltage limit, relatively controls the lower limit of output voltage with lower voltage limit; When output voltage rose to upper voltage limit, drive pulse signal turn-offed switching device, and when output voltage dropped to lower voltage limit, drive pulse signal made the switching device conducting, thereby realized the slope compensation control that voltage-type stagnates and encircles the control switch converter.
Another object of the present invention provides the device of the slope compensation control method that realizes the stagnant ring of above-mentioned voltage-type control switch converter.Under same inventive concept, corresponding to the slope compensation control method that realizes the stagnant ring of voltage-type control switch converter concrete implement device is proposed.Control device is comprised of voltage check device 5, current sampling circuit 6, subtracter 7, adder 8, upper limit reference voltage 9, lower limit reference voltage 10, comparator 11, comparator 12, rest-set flip-flop 13 and drive circuit 14.The output voltage that voltage check device 5 detects feeds back to respectively comparator 11 and comparator 12; The inductor current signal of current sampling circuit 6 samplings, feed back to respectively subtracter 7 and adder 8, the inductor current signal and the upper limit reference voltage 9 that feed back to subtracter 7 subtract each other the generation upper voltage limit, and the inductor current signal and 10 additions of lower limit reference voltage that feed back to adder 8 produce lower voltage limit; Output voltage compares by comparator 11 and upper voltage limit, compare by comparator 12 and lower voltage limit, the output of two comparators all for triggering rest-set flip-flop 13, produces pulse control signal, and the final pulse control signal is by drive circuit 14 control main circuit work.
Compared with prior art, the invention has the beneficial effects as follows:
One, compares with the stagnant ring control of voltage-type, adopt the present invention to reduce the dependence of the stagnant ring of voltage-type control switch converter to output capacitance characteristic (such as equivalent series resistance), eliminated the impact of output voltage phase place hysteresis inductive current phase place on the stagnant ring control of voltage-type, effectively with output voltage control in the bound Voltage loop, thereby improved the stagnate stable state accuracy of ring control of voltage-type.
Two, controller is sampled to inductor current signal, has realized Cycle by Cycle control and the overcurrent protection of inductive current.
Description of drawings
Fig. 1 is control system implement device structured flowchart of the present invention.
Fig. 2 is the electrical block diagram of the embodiment of the invention.
Fig. 3 is the output voltage and driving signal corresponding relation schematic diagram of the embodiment of the invention.
Fig. 4 is the time-domain-simulation oscillogram of the switch converters of the embodiment of the invention.
Fig. 5 is that the stagnant switch converters of control that encircles of the embodiment of the invention and voltage-type is in output capacitance equivalent series resistance hour output voltage time-domain-simulation oscillogram.
Fig. 6 is that the stagnant switch converters of control that encircles of the embodiment of the invention and voltage-type is in output capacitance equivalent series resistance hour inductive current time-domain-simulation oscillogram.
Among Fig. 4: (a) be converter output voltage time-domain-simulation waveform; (b) the driving signal time-domain-simulation waveform of exporting for controller.
Among Fig. 5: (a) stagnate the switch converters of ring control at the output voltage time-domain-simulation waveform of output capacitance equivalent series resistance hour for voltage-type; (b) be that the switch converters of the embodiment of the invention is at the output voltage time-domain-simulation waveform of output capacitance equivalent series resistance hour.
Among Fig. 6: (a) stagnate the switch converters of ring control at the inductive current time-domain-simulation waveform of output capacitance equivalent series resistance hour for voltage-type; (b) be that the switch converters of the embodiment of the invention is at the inductive current time-domain-simulation waveform of output capacitance equivalent series resistance hour.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Among Fig. 1, the dotted line frame is power circuit outward, comprising: input 1, switching device 2, filter 3 and export 4; Annexation: input 1 is connected to switching device 2, is transferred to filter 3 through behind the switching device 2, enters after filtration output 4 after the effect of wave apparatus 3.Be controller in the dotted line frame, comprise: voltage check device 5, current sampling circuit 6, subtracter 7, adder 8, upper limit reference voltage 9, lower limit reference voltage 10, comparator 11, comparator 12, rest-set flip-flop 13 and drive circuit 14; Annexation is: be connected to the voltage check device 5 in the output 4, be connected respectively to the input of comparator 11 and comparator 12; Be connected to the current sampling circuit 6 on the filter 3, be connected respectively to the input of subtracter 7 and the input of adder 8; Another input of subtracter 7 is connected with upper limit reference voltage 9, and another input of adder 8 is connected with lower limit reference voltage 10; Another input of the output of subtracter 7 and comparator 11 joins, and another input of the output of adder 8 and comparator 12 joins; The output of comparator 11 and comparator 12 joins with two inputs of rest-set flip-flop 13 respectively, and the output of rest-set flip-flop 13 is connected with drive circuit 14, is used for conducting and the shutoff of control switch device 2.
Comparison diagram 2 and Fig. 1, corresponding relation between each device is respectively: the corresponding input 1 of input voltage E, the corresponding switching device 2 of S (MOSFET) and diode D, the corresponding filter 3 of inductance L, capacitor C and dead resistance r, the corresponding output 4 of load R, voltage sampling circuit 5 is concrete forms of voltage check device 5, current sampling circuit 6 corresponding current sample circuits 6, subtracter 7 corresponding subtracters 7, adder 8 respective adders 8, upper limit reference voltage V
HCorresponding upper limit reference voltage 9, the lower limit reference voltage V
LCorresponding lower limit reference voltage 10, comparator 11 corresponding comparators 11, comparator 12 corresponding comparators 12, rest-set flip-flop 13 corresponding rest-set flip-flops 13, drive circuit 14 corresponding drive circuits 14.
Connection concrete among Fig. 2 is: the drain electrode of the positive pole of input voltage E and switch S (MOSFET) is joined, and the end (output negative pole) of the anode of negative pole and diode D, the end of equivalent series resistance r and load R joins; One end of the source electrode of switch S (MOSFET) and the negative electrode of diode D and inductance L joins, and the end (output cathode) of an end of the other end of inductance L and capacitor C and load R joins, and the other end of capacitor C and equivalent series resistance r join.The end (output cathode) of the input of voltage sampling circuit 5 and load R joins, and its output joins with the normal phase input end of comparator 11 respectively, joins with the inverting input of comparator 12; The anode of the input of current sampling circuit 6 and diode D joins, and the output of current sampling circuit 6 joins with the negative input end of subtracter 7 and a positive input terminal of adder 8 respectively; The positive input terminal of subtracter 7 and upper limit reference voltage V
HJoin, the inverting input of its output and comparator 11 joins; Another positive input terminal of adder 8 and lower limit reference voltage V
LJoin, the positive input of its output and comparator 12 joins; The output of comparator 11 and comparator 12 is held with the R of rest-set flip-flop 13 end and S respectively and is joined; The Q end of rest-set flip-flop 13 joins with the input of drive circuit 14; The grid of the output of drive circuit 14 and switch S (MOSFET) joins.
Being achieved as follows of control method:
Step 1: voltage detecting circuit 5 feeds back to respectively comparator 11 and comparator 12 with the voltage that detects.
Step 2: current sampling circuit 6 feeds back to respectively subtracter 7 and adder 8 with the inductor current signal that samples, the inductor current signal and the upper limit reference voltage 9 that feed back to subtracter 7 subtract each other the generation upper voltage limit, and the inductor current signal and 10 additions of lower limit reference voltage that feed back to adder 8 produce lower voltage limit.
Step 3: the output of subtracter 7 compares through comparator 11 and output voltage, and the output of adder 8 compares through comparator 12 and output voltage.
Step 4: after relatively
,All for triggering rest-set flip-flop 13, when output voltage rose to upper voltage limit, rest-set flip-flop 13 resetted in the output of comparator 11 and comparator 12, and its output turn-offs switching device 2 through drive circuit 14, and output voltage descends; When output voltage drops to lower voltage limit, rest-set flip-flop 13 set, its output makes switching device 2 conductings through drive circuit 14, and output voltage rises.
Step 5: when output voltage rises to upper voltage limit again, enter the next pulse control cycle.Thus, the voltage of controller power ratio control circuit stable output.
Fig. 2, Fig. 3 show the application of voltage-type stagnant ring control switch converter slope compensation control technology in the Buck converter.
The concrete course of work and principle are: in sampling instant, by voltage sampling circuit the output voltage that samples is fed back to respectively two comparators; Simultaneously, current sampling circuit feeds back to respectively subtracter and adder with the inductor current signal that samples, the inductor current signal and the upper limit reference voltage that feed back to subtracter subtract each other the generation upper voltage limit, and the inductor current signal and the addition of lower limit reference voltage that feed back to adder produce lower voltage limit; Output voltage compares with upper and lower limit voltage respectively by two comparators.When output voltage rose to upper voltage limit, with the comparator output high level that rest-set flip-flop R end joins, rest-set flip-flop was reset, and its Q end output low level is turn-offed derailing switch; When output voltage dropped to lower voltage limit, with the comparator output high level that rest-set flip-flop S end joins, rest-set flip-flop was set, and its Q end output high level makes the derailing switch conducting, thereby control switch converter output voltage is in the bound Voltage loop.By introducing current signal as slope compensation, reduced the dependence of the stagnant ring control of voltage-type to the output capacitance equivalent series resistance, improved its control performance.
Analysis of simulation result:
Fig. 4 is for adopting the PSIM simulation software control method of the present invention to be carried out the result of time-domain-simulation, the transverse axis of component among Fig. 4 (a), (b) is the time (ms), (a) the longitudinal axis is output voltage (V), and the longitudinal axis (b) is for driving signal amplitude (V).As can be seen from Figure 4, the converter working stability, output voltage is controlled in the bound Voltage loop effectively.Simulated conditions: input voltage V
In=15V, upper limit reference voltage V
H=5.05V, the lower limit reference voltage V
L=4.95V, inductance L=200uH, capacitor C=100uF, equivalent series resistance r=80m Ω, current sample gain G=0.04, load R=5 Ω.
Fig. 5 is that voltage-type stagnates ring control and switch converters of the present invention when the output capacitance equivalent series resistance is r=60m Ω, the time-domain-simulation oscillogram of output voltage, component among Fig. 5 (a), (b) be the stagnant ring control of corresponding voltage and the present invention respectively, transverse axis is the time (ms), and the longitudinal axis is output voltage (V).Among Fig. 5, in identical output capacitance equivalent series resistance situation, adopt the output voltage of switch converters of the present invention effectively to be controlled in the bound Voltage loop, and adopt the output voltage of the stagnant ring of voltage-type control switch converter to exceed the bound reference voltage ring of setting, lost control action.As seen adopt switch converters of the present invention to improve the control performance of the stagnant ring control of voltage-type controller.
Fig. 6 is that voltage-type stagnates ring control and switch converters of the present invention when the output capacitance equivalent series resistance is r=60m Ω, the time-domain-simulation oscillogram of inductive current, component among Fig. 6 (a), (b) be the stagnant ring control of corresponding voltage type and the present invention respectively, transverse axis is the time (ms), and the longitudinal axis is inductive current (A).Among Fig. 6, adopt switch converters inductive current fluctuation of the present invention little, have outstanding current limitation effect.
The present invention also can be used for the Switching Power Supply of Boost converter, Buck-boost converter, Cuk converter, forward converter, half-bridge converter, full-bridge converter constant power the electric circuit constitute except can be used for controlling the power inverter in above-described embodiment.
Claims (2)
1. a voltage-type stagnates and encircles the slope compensation method of control switch converter, it is characterized in that, and be by voltage sampling circuit, the output voltage of sampled power converter feeds back to respectively two comparators; Pass through simultaneously current sampling circuit, the inductor current signal of sampled power converter, feed back to respectively subtracter and adder, the inductor current signal and the upper limit reference voltage that feed back to subtracter subtract each other the generation upper voltage limit, and the inductor current signal and the addition of lower limit reference voltage that feed back to adder produce lower voltage limit; Output voltage is relatively controlled the output voltage limit value through comparator and upper voltage limit, relatively controls the lower limit of output voltage with lower voltage limit; When output voltage rose to upper voltage limit, drive pulse signal turn-offed switching device, and when output voltage dropped to lower voltage limit, drive pulse signal made the switching device conducting, thereby realized the slope compensation control that voltage-type stagnates and encircles the control switch converter.
2. a control device of realizing the described method of claim 1 is characterized in that this control device is comprised of voltage check device (5), current sampling circuit (6), subtracter (7), adder (8), upper limit reference voltage (9), lower limit reference voltage (10), comparator (11), comparator (12), rest-set flip-flop (13) and drive circuit (14); The output voltage that voltage check device (5) detects feeds back to respectively comparator (11) and comparator (12); The inductor current signal of current sampling circuit (6) sampling, feed back to respectively subtracter (7) and adder (8), the inductor current signal and the upper limit reference voltage (9) that feed back to subtracter (7) subtract each other the generation upper voltage limit, and the inductor current signal and lower limit reference voltage (10) addition that feed back to adder (8) produce lower voltage limit; Output voltage compares by comparator (11) and upper voltage limit, compare by comparator (12) and lower voltage limit, the output of two comparators is all for triggering rest-set flip-flop (13), produce pulse control signal, the final pulse control signal is by the work of drive circuit (14) control main circuit.
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| CN103542536A (en) * | 2013-10-30 | 2014-01-29 | 安徽英特电子有限公司 | Water bath heating control circuit |
| CN104868718A (en) * | 2015-05-07 | 2015-08-26 | 潍柴动力股份有限公司 | Voltage boosting circuit |
| CN105425889A (en) * | 2015-11-09 | 2016-03-23 | 华北电力大学（保定） | High-precision voltage and current stability control circuit based on high-frequency power supply pre-regulation level |
| CN107262285A (en) * | 2017-08-10 | 2017-10-20 | 北京博谦工程技术有限公司 | A kind of current control device for static dust-removing power |
| CN111585441A (en) * | 2019-02-18 | 2020-08-25 | 东南大学 | Control system and method for primary side regulation active clamping flyback converter |
| CN111585440A (en) * | 2019-02-18 | 2020-08-25 | 东南大学 | Control system and method of active clamp flyback converter |
| CN111697828A (en) * | 2016-10-09 | 2020-09-22 | 昂宝电子（上海）有限公司 | BUCK converter and control method thereof |
| CN112019025A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Operation control method, device, circuit, household appliance and computer storage medium |
| CN112218413A (en) * | 2020-09-03 | 2021-01-12 | 厦门市智联信通物联网科技有限公司 | High-efficiency high-power isolation dimming signal amplifying circuit |
| US11374515B1 (en) | 2020-12-29 | 2022-06-28 | Industrial Technology Research Institute | Operation method and operation device of motor driver for driving motor |
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| CN103542536B (en) * | 2013-10-30 | 2016-06-29 | 安徽英特电子有限公司 | Water bath heating control circuit |
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| CN107262285A (en) * | 2017-08-10 | 2017-10-20 | 北京博谦工程技术有限公司 | A kind of current control device for static dust-removing power |
| CN111585441A (en) * | 2019-02-18 | 2020-08-25 | 东南大学 | Control system and method for primary side regulation active clamping flyback converter |
| CN111585440A (en) * | 2019-02-18 | 2020-08-25 | 东南大学 | Control system and method of active clamp flyback converter |
| CN111585441B (en) * | 2019-02-18 | 2022-06-17 | 东南大学 | Control system and method for primary side regulation active clamping flyback converter |
| CN111585440B (en) * | 2019-02-18 | 2022-06-17 | 东南大学 | Control system and method of active clamp flyback converter |
| CN112019025A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Operation control method, device, circuit, household appliance and computer storage medium |
| CN112218413A (en) * | 2020-09-03 | 2021-01-12 | 厦门市智联信通物联网科技有限公司 | High-efficiency high-power isolation dimming signal amplifying circuit |
| CN112218413B (en) * | 2020-09-03 | 2021-10-01 | 厦门市智联信通物联网科技有限公司 | High-efficiency high-power isolation dimming signal amplifying circuit |
| US11374515B1 (en) | 2020-12-29 | 2022-06-28 | Industrial Technology Research Institute | Operation method and operation device of motor driver for driving motor |
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Application publication date: 20130213 |