CN101814838A - Control method and device of power converter of resonance topological circuit - Google Patents
Control method and device of power converter of resonance topological circuit Download PDFInfo
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- CN101814838A CN101814838A CN 200910117939 CN200910117939A CN101814838A CN 101814838 A CN101814838 A CN 101814838A CN 200910117939 CN200910117939 CN 200910117939 CN 200910117939 A CN200910117939 A CN 200910117939A CN 101814838 A CN101814838 A CN 101814838A
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Abstract
The invention relates to a control method and a device of a power converter of a resonance topological circuit, wherein the control method of the power converter of the topological circuit comprises the steps of regulating the frequency of the power converter and the combination of the duty ratio to ensure that the power converter has good monotonicity in the whole output range of the control device. The control device of the power converter of the resonance topological circuit comprises a control module, which is used for regulating the frequency of the power converter and the combination of the duty ratio to ensure that the power converter has good monotonicity in the whole output range of the control device. When being implemented, the method and the device of the invention can ensure the monotonicity of the power converter of the resonance topological circuit in the whole PWM work range.
Description
Technical field
The present invention relates to the control field, more particularly, relate to a kind of control method and device of power inverter of resonance topological circuit.
Background technology
LLC is as DC/DC translation circuit topology, by rational design, almost can realize that no-voltage is open-minded by full-load range, realize secondary rectifier diode natural zero-crossing in specified attitude, almost oppositely do not recover, improve transducer effciency greatly, sinusoidal current waveform makes the higher harmonic components of switching frequency very little simultaneously, helps the design of electromagnetic interference.Its frequency gain curve as shown in Figure 1.
As can be seen from Figure 1: along with output voltage reduces (Gdc decline), load reduction, the operating frequency of power inverter needs constantly to increase, yet because the restriction of aspects such as drive circuit, power semiconductor itself, system resource, power inverter has individual maximum operating frequency.When converter work behind highest frequency, industry has three kinds of modes to handle substantially: 1 power inverter directly shuts down, 2 variable power device discontinuous operations, 3 allow power inverter be operated in the output that pulse-width modulation (PWM) state is regulated power inverter.Because preceding dual mode has very big influence to the performance of power inverter, be usual way so regulate the power transducer gain by PWM.
Symmetrical half bridge LLC power inverter topology commonly used as shown in Figure 2.Ignore Dead Time, the common used PWM drive waveforms is shown in Fig. 3,4.No matter which kind of the power inverter topology uses send out the ripple mode, and the afterflow of MOS (metal-oxide-semiconductor) transistor body diode (or inverse parallel diode) and reverse the recovery cause power inverter to have a tangible non-monotone area in the PWM attitude.Shown in Fig. 5,6.From top two figure as can be seen: PWM1 is from the D1 duty ratio, and PWM2 is from D2, and it is quite mild that its duty ratio, gain curve become.
Power inverter operating frequency and duty ratio generally all are that its control strategy as shown in Figure 7 by the output decision of controller.Above-mentioned control strategy wants to guarantee good control characteristic, must make power inverter have good monotonicity in entire controller output (Piout) scope.And by Fig. 5,6 as can be known, the LLC power inverter has one section in the PWM district be not dull, and in fact full-bridge LLC and other resonant circuits PWM attitude all have similar not dull phenomenon.Therefore above-mentioned control strategy can not well solve the monotonicity problem.
Therefore, need a kind of control method and device of power inverter, be used for the monotonicity of guaranteed output converter in the whole PWM working range.
Summary of the invention
The technical problem to be solved in the present invention is, controller output at prior art can not make LLC power inverter and other resonance topological circuits keep dull defective in the whole PWM working range, a kind of control method and device of power inverter of resonance topological circuit are provided, are used for the monotonicity of guaranteed output converter in the whole PWM working range.
The basic ideas that the present invention solves its technical problem are: because the same gain of resonant circuit has different frequency, duty ratio combination, so can make up frequency, the duty ratio combination that replaces the monotonicity difference with the good frequency of monotonicity, duty ratio, come the guaranteed output converter in the entire controller output area, to have good monotonicity with this.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of control method of power inverter of resonance topological circuit, comprise that the combination of adjusting power inverter frequency, duty ratio comes the guaranteed output converter to have good monotonicity in the entire controller output area.
In the control method of the power inverter of resonance topological circuit of the present invention, comprise
A. when controller was exported controlled quentity controlled variable less than first set point, control change device operating frequency increased along first curve along the 3rd curvilinear motion, duty ratio;
B. be increased to when equaling first set point in described controller output controlled quentity controlled variable, the operating frequency of controlling described converter is along second point of safes that the 3rd curve increases, duty ratio is stabilized in second curve, and controller output this moment controlled quentity controlled variable is greater than first set point and less than second set point;
C. be increased to when equaling second set point when the output controlled quentity controlled variable of controller, the operating frequency that the duty ratio of controlling described converter is stabilized in first point of safes of first curve, converter increases along the 3rd curve.
In the control method of the power inverter of resonance topological circuit of the present invention, the DC current gain at the described second curve maximum duty cycle place equals the DC current gain that power inverter PWM attitude keeps the point of dull maximum duty cycle greater than duty ratio on first curve.
In the control method of the power inverter of resonance topological circuit of the present invention, described first curve is duty=K1* (piout-piout
Amin); Described second curve is duty=K2* (piout-piout
Bmin), wherein, duty is the duty ratio of power inverter, piout is the output controlled quentity controlled variable of controller, piout
AminAnd piout
BminIt is the controller output valve of the zero duty ratio correspondence of first curve and second curve.
In the control method of the power inverter of resonance topological circuit of the present invention, K1=K2.
In the control method of the power inverter of resonance topological circuit of the present invention, the output controlled quentity controlled variable that described the 3rd curve is a controller and the function of frequency.
In the control method of the power inverter of resonance topological circuit of the present invention, the DC current gain of second point of safes of described second curve equals duty ratio on first curve and equals the DC current gain that power inverter PWM attitude keeps the point of dull maximum duty cycle.
In the control method of the power inverter of resonance topological circuit of the present invention, the DC current gain at the first set point place of described first curve equals the DC current gain that power inverter PWM attitude keeps second set point of dullness less than duty ratio on second curve, first set point of wherein said first curve is the point on first curve of the output Piout of described controller correspondence when equaling first set point, and second set point of described second curve is the point on second curve of the output Piout of described controller correspondence when equaling second set point.
In the control method of the power inverter of resonance topological circuit of the present invention,, the described first slope of a curve K1 and the second slope of a curve K2 are adjustable.
In the control method of the power inverter of resonance topological circuit of the present invention, when described controller output controlled quentity controlled variable greater than first set point and when being less than or equal to second set point, the operating frequency of controlling described converter is stabilized in the frequency stabilization point, the operating frequency of described converter when the frequency of described frequency stabilization point equals first set point less than described controller output controlled quentity controlled variable.
In the control method of the power inverter of resonance topological circuit of the present invention, comprise
A. when controller was exported controlled quentity controlled variable less than first set point, control change device operating frequency increased along first curve along the 3rd curvilinear motion, duty ratio;
B. in the output controlled quentity controlled variable of controller during greater than first set point, control change device operating frequency increases along second curve along the 3rd curvilinear motion, duty ratio.
In the control method of the power inverter of resonance topological circuit of the present invention, described first curve is duty=K1* (piout-piout
Amin), described second curve is duty=K2* (piout-piout
Bmin); Wherein, duty is the duty ratio of power inverter, and piout is the output controlled quentity controlled variable of controller, piout
AminAnd piout
BminIt is the controller output valve of the zero duty ratio correspondence of first curve and second curve, K2＜K1, and the DC current gain of the power output that guarantees controller this moment between the difference of the power output of the power output of power inverter, power inverter and the ring value that stagnates the time keeps the DC current gain of point of the maximum duty cycle of dullness greater than power inverter PWM attitude
In the control method of the power inverter of resonance topological circuit of the present invention, K2=0.
The technical solution adopted for the present invention to solve the technical problems is: the control device of constructing a kind of power inverter of resonance topological circuit, it is characterized in that, comprise control module, the combination that is used to adjust power inverter frequency, duty ratio comes the guaranteed output converter to have good monotonicity in the entire controller output area.
Implement method and apparatus of the present invention, can guarantee the monotonicity of the power inverter of resonance topological circuit in the whole PWM working range.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the gain curve figure of the power inverter of prior art;
Fig. 2 is the basic topological circuit figure of the power inverter of prior art;
Fig. 3 is the PWM drive waveforms figure of the power inverter shown in Fig. 2;
Fig. 4 is the another PWM drive waveforms figure of the power inverter shown in Fig. 2;
Fig. 5 is duty ratio and the output voltage curve chart of power inverter under the driving of the PWM drive waveforms shown in Fig. 3;
Fig. 6 is duty ratio and the output voltage curve chart of power inverter under the driving of the PWM drive waveforms shown in Fig. 4;
Fig. 7 is the control strategy figure of the power inverter of prior art;
Fig. 8 is the flow chart of control method of the power inverter of resonance topological circuit of the present invention;
Fig. 8 A is the logic diagram of control device of the power inverter of resonance topological circuit of the present invention;
Fig. 9 is the control strategy figure of an embodiment of control method of the power inverter of resonance topological circuit of the present invention;
Figure 10 is the another control strategy figure of control method of the power inverter of resonance topological circuit of the present invention;
Figure 11 is the another control strategy figure of control method of the power inverter of resonance topological circuit of the present invention;
Figure 12 is the another control strategy figure of control method of the power inverter of resonance topological circuit of the present invention;
Figure 13 is the another control strategy figure of control method of the power inverter of resonance topological circuit of the present invention.
Embodiment
Because the same gain of resonant circuit has different frequency, duty ratio combination, so can make up frequency, the duty ratio combination that replaces the monotonicity difference with the good frequency of monotonicity, duty ratio, come the guaranteed output converter in the entire controller output area, to have good monotonicity with this.
Fig. 8 is the embodiment of control method of the power inverter of resonance topological circuit of the present invention, and this method starts from step S1.At step S2, judge that whether controller output controlled quentity controlled variable is less than first set point.If execution in step S6 then, the operating frequency of controlling described converter along the 3rd curve increase, duty ratio increases along first curve; Otherwise execution in step S3, whether judgement is increased in described controller output controlled quentity controlled variable equals first set point.If, execution in step S7 then, the operating frequency of controlling described converter is along second point of safes that the 3rd curve increases, duty ratio is stabilized in second curve, otherwise execution in step S4 judges that controller output controlled quentity controlled variable is increased between first set point and second set point.If, execution in step S8 then, the operating frequency of control change device along the 3rd curve increase, duty ratio increases along second curve.Otherwise execution in step S5 judges whether the output controlled quentity controlled variable of controller is increased to more than or equal to second set point.If execution in step S9 then, the operating frequency that the duty ratio of controlling described converter is stabilized in first point of safes of first curve, converter increases along the 3rd curve, otherwise execution in step S2.The DC current gain at the second curve maximum duty cycle place described in the whole control process greater than first curve on duty ratio equal the DC current gain that power inverter PWM attitude keeps the point of dull maximum duty cycle.The DC current gain of second point of safes of described second curve equals duty ratio on first curve and equals the DC current gain that power inverter PWM attitude keeps the point of dull maximum duty cycle.The DC current gain at the first set point place of described first curve equals the DC current gain that power inverter PWM attitude keeps the second set point place of dullness less than duty ratio on second curve.
Fig. 8 A is the logic diagram of control device of the power inverter of resonance topological circuit of the present invention.As shown in the figure, the control device of the power inverter of resonance topological circuit of the present invention comprises control module, and the combination that is used to adjust power inverter frequency, duty ratio comes the guaranteed output converter to have good monotonicity in the entire controller output area.
Fig. 9 is the control strategy figure of an embodiment of control method of the power inverter of resonance topological circuit of the present invention.In Fig. 9, K1=K2=K, wherein K1, K2 can get arbitrary value according to the needs of power inverter.Those skilled in the art understand and can skillfully use the value that the routine techniques method obtains K1 and K2.
Ts min: the minimum period that converter can be worked, i.e. maximum operation frequency;
Ts max: the maximum cycle that converter can be worked, i.e. minimum frequency of operation;
Duty A max:: converter PWM attitude keeps dull maximum duty cycle;
Piout: converter controller output;
Ts: by the transducer work period of Piout decision;
Duty: by the transducer work duty ratio of Piout decision;
Its control principle is as follows:
1, when controller was exported Piout less than Piout1, converter was operated in peak frequency, and duty ratio increases along curve A, promptly by formula duty=K* (piout-piout
A min) determine, must guarantee that this regional converter PWM attitude is dull;
2 when controller output equals Piout1, with the intercept Piout of curve A and abscissa
A minChange Piout into
B min, transform to curve B, promptly duty ratio is by formula duty=K* (piout-piout
B min) determine, then, converter under the effect of loop, be stabilized on the curve B a bit, this point gains and equals that duty equals the gain that Duty A max is ordered on the curve A.Along with the increase of Piout, the converter duty ratio increases along curve B.The operating frequency of converter is determined by the Ts curve.The Ts curve is the output controlled quentity controlled variable of controller and the function of frequency.Those skilled in the art understand and can skillfully use routine techniques method acquisition Ts curve.
3 when controller output equals Piout2, duty ratio is increased to Duty Amax along curve B, change back Piout A min again with intercept, transform to curve A, equally, converter is stabilized in the somewhere of curve A under the effect of loop, the gain of this point equals that duty equals the gain that DutyAmax is ordered on the curve B.
In this control strategy, key be guarantee curve B maximum duty cycle place (Ts B min/Duty Amax%) gain basically more than or equal to the maximum duty cycle place (Ts min/50%) of curve A, like this, just can avoid converter to be operated in DutyAmin%～non-montonic range of 50% this section.Thereby guarantee the monotonicity in the whole Piout scope of converter.
For above-mentioned each value, Piout1, Piout2, Piout
A min, Piout
B min, the known or known technical method that obtains these parameters of those skilled in the art.
Figure 10 is the another control strategy figure of control method of the power inverter of resonance topological circuit of the present invention; In this embodiment, the slope K 1 of first curve A and the slope K 2 of second curve B are adjustable, and K1 ≠ K2.Figure 11 is the another control strategy figure of control method of the power inverter of resonance topological circuit of the present invention.In this embodiment, when power inverter was operated in curve B, fixing its cycle was Ts B, and this moment, the operating frequency of described converter when this fixed cycle TsB equals Piout1 greater than controller output controlled quentity controlled variable.Other controlled step can be referring to Fig. 9 and 10.
Owing to, reduce the slope of curve A when duty ratio during greater than DutyAmax, promptly reduce to transfer wide weighting modulating frequency and width the overlay region in, reducing the wide not dull influence of accent, so new control strategy (as shown in figure 12) has been proposed to whole monotonicity.In this scheme, when controller output Piout＜Piout1, control change device operating frequency along curve Ts min increase, duty ratio is along duty=K1* (piout-piout
Amin) increase; During greater than first set point, control change device operating frequency increases along Ts min in the output controlled quentity controlled variable of controller, and duty ratio is along duty=K2* (piout-piout
Bmin) increase; Wherein, duty is the duty ratio of power inverter, and piout is the output controlled quentity controlled variable of controller, piout
AminAnd piout
BminBe the controller output valve of the zero duty ratio correspondence of first curve and second curve, K2＜K1, and switch the gain the when gain of needs is greater than Ts min/50% duty ratio when wanting guaranteed output to equal Po-P1 by the stagnant ring of power this moment.
When duty ratio during greater than Duty A max, fixed duty cycle comes the bonding tonality by frequency modulation, switches by the power ring that stagnates, and DC current gain was greater than Ts min/50% when same guaranteed output equaled Po-P1.Control strategy as shown in figure 13, in this embodiment, K2=0.
An alternative embodiment of the invention provides a kind of machine readable memory, stores computer program on it.This program comprises one section code at least, and described at least one section code carried out by machine and made this machine can carry out the method step described in the application.Therefore, the present invention can pass through hardware, software, and perhaps soft, combination of hardware realizes.
The present invention can realize with centralized system at least one computer system, perhaps be realized with dispersing mode by the different piece in the computer system that is distributed in several interconnection.Any computer system or miscellaneous equipment that can implementation method all be applicatory.The combination of software and hardware commonly used can be the general-purpose computing system that computer program is installed, and by installing and executive program control computer system, it is moved by method.
Though the present invention is that specific embodiment describes with half-bridge LCC resonant circuit, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention, such as inventive concept of the present invention being applied in full-bridge LLC and other resonant circuits, and then solve the not dull phenomenon of its PWM attitude.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.
Claims (14)
1. the control method of the power inverter of a resonance topological circuit is characterized in that, comprises that the combination of adjusting power inverter frequency, duty ratio comes the guaranteed output converter to have good monotonicity in the entire controller output area.
2. according to the control method of the power inverter of the described resonance topological circuit of claim 1, it is characterized in that, comprise
A. when controller was exported controlled quentity controlled variable less than first set point, control change device operating frequency increased along first curve along the 3rd curvilinear motion, duty ratio;
B. be increased to when equaling first set point in described controller output controlled quentity controlled variable, the operating frequency of controlling described converter is along second point of safes that the 3rd curve increases, duty ratio is stabilized in second curve, and controller output this moment controlled quentity controlled variable is greater than first set point and less than second set point;
C. be increased to when equaling second set point when the output controlled quentity controlled variable of controller, the operating frequency that the duty ratio of controlling described converter is stabilized in first point of safes of first curve, converter increases along the 3rd curve.
3. according to the control method of the power inverter of the described resonance topological circuit of claim 2, it is characterized in that the DC current gain at the described second curve maximum duty cycle place equals the DC current gain of the point of the dull maximum duty cycle of power inverter PWM attitude maintenance greater than duty ratio on first curve.
4. according to the control method of the power inverter of the described resonance topological circuit of claim 2, it is characterized in that described first curve is duty=K1* (piout-piout
Amin); Described second curve is duty=K2* (piout-piout
Bmin), wherein, duty is the duty ratio of power inverter, piout is the output controlled quentity controlled variable of controller, piout
AminAnd piout
BminIt is the controller output valve of the zero duty ratio correspondence of first curve and second curve.
5. according to the control method of the power inverter of the described resonance topological circuit of claim 4, it is characterized in that K1=K2.
6. according to the control method of the power inverter of the described resonance topological circuit of claim 2, it is characterized in that the output controlled quentity controlled variable that described the 3rd curve is a controller and the function of frequency.
7. according to the control method of the power inverter of the described resonance topological circuit of claim 2, it is characterized in that the DC current gain of second point of safes of described second curve equals duty ratio on first curve and equals the DC current gain that power inverter PWM attitude keeps the point of dull maximum duty cycle.
8. according to the control method of the power inverter of the described resonance topological circuit of claim 2, it is characterized in that the DC current gain at the first set point place of described first curve equals the DC current gain that power inverter PWM attitude keeps the second set point place of dullness less than duty ratio on second curve.
9. according to the control method of the power inverter of the described resonance topological circuit of claim 2, it is characterized in that the described first slope of a curve K1 and the second slope of a curve K2 are adjustable.
10. according to the control method of the power inverter of the described resonance topological circuit of claim 2, it is characterized in that, when described controller output controlled quentity controlled variable greater than first set point and when being less than or equal to second set point, the operating frequency of controlling described converter is stabilized in the frequency stabilization point, the operating frequency of described converter when the frequency of described frequency stabilization point equals first set point less than described controller output controlled quentity controlled variable.
11. the control method according to the power inverter of the described resonance topological circuit of claim 1 is characterized in that, comprises
A. when controller was exported controlled quentity controlled variable less than first set point, control change device operating frequency increased along first curve along the 3rd curvilinear motion, duty ratio;
B. in the output controlled quentity controlled variable of controller during greater than first set point, control change device operating frequency increases along second curve along the 3rd curvilinear motion, duty ratio.
12. the control method according to the power inverter of the described resonance topological circuit of claim 11 is characterized in that described first curve is duty=K1* (piout-piout
Amin), described second curve is duty=K2* (piout-piout
Bmin); Wherein, duty is the duty ratio of power inverter, and piout is the output controlled quentity controlled variable of controller, piout
AminAnd piout
BminIt is the controller output valve of the zero duty ratio correspondence of first curve and second curve, K2＜K1, and the DC current gain of the power output that guarantees controller this moment between the difference of the power output of the power output of power inverter, power inverter and the ring value that stagnates the time keeps the DC current gain of point of the maximum duty cycle of dullness greater than power inverter PWM attitude.
13. the control method according to the power inverter of the described resonance topological circuit of claim 11 is characterized in that K2=0.
14. the control device of the power inverter of a resonance topological circuit is characterized in that, comprises control module, the combination that is used to adjust power inverter frequency, duty ratio comes the guaranteed output converter to have good monotonicity in the entire controller output area.
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| CN 200910117939 CN101814838B (en) | 2009-02-19 | 2009-02-19 | Control method and device of power converter of resonance topological circuit |
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| CN101814838B CN101814838B (en) | 2013-02-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447397A (en) * | 2010-10-13 | 2012-05-09 | 日立电脑机器股份有限公司 | Power supply device |
| CN103795252A (en) * | 2012-10-31 | 2014-05-14 | 中兴通讯股份有限公司 | Control method of series resonant converter |
| WO2018019095A1 (en) * | 2016-07-29 | 2018-02-01 | 中兴通讯股份有限公司 | Control method and device for resonant converter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE295624T1 (en) * | 2000-02-24 | 2005-05-15 | Matsushita Electric Works Ltd | CONTACTLESS ELECTRICAL POWER TRANSMITTING SYSTEM WITH CONSTANT LOAD VOLTAGE KEEPING FUNCTION |
| CN101064476B (en) * | 2006-04-30 | 2012-06-27 | 艾默生网络能源系统北美公司 | Resonant DC/DC converter and its control method |
| CN1870408B (en) * | 2006-06-19 | 2010-10-20 | 艾默生网络能源有限公司 | Multi-channel output DC-DC inverter |
| CN100421342C (en) * | 2006-07-06 | 2008-09-24 | 艾默生网络能源有限公司 | Resonance circuit output characteristic controlling method |
-
2009
- 2009-02-19 CN CN 200910117939 patent/CN101814838B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447397A (en) * | 2010-10-13 | 2012-05-09 | 日立电脑机器股份有限公司 | Power supply device |
| CN102447397B (en) * | 2010-10-13 | 2014-12-03 | 株式会社日立信息通信工程 | Power supply device |
| CN103795252A (en) * | 2012-10-31 | 2014-05-14 | 中兴通讯股份有限公司 | Control method of series resonant converter |
| CN103795252B (en) * | 2012-10-31 | 2016-02-24 | 中兴通讯股份有限公司 | A kind of control method of series resonant converter |
| US9425676B2 (en) | 2012-10-31 | 2016-08-23 | Zte Corporation | Control method for series resonant converter |
| WO2018019095A1 (en) * | 2016-07-29 | 2018-02-01 | 中兴通讯股份有限公司 | Control method and device for resonant converter |
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| CN101814838B (en) | 2013-02-27 |
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Address after: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee after: Walteff energy systems company Address before: The United States of Ohio city F Lorain Street No. 1122 Patentee before: Emerson Network Power Co., Ltd. |
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Effective date of registration: 20211223 Address after: Ohio, USA Patentee after: Dimension Corp. Address before: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee before: VERTIV ENERGY SYSTEMS, Inc. |