CN103051290B - Peak value keeps driving method - Google Patents
Peak value keeps driving method Download PDFInfo
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- CN103051290B CN103051290B CN201210489049.9A CN201210489049A CN103051290B CN 103051290 B CN103051290 B CN 103051290B CN 201210489049 A CN201210489049 A CN 201210489049A CN 103051290 B CN103051290 B CN 103051290B
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Abstract
This application discloses a kind of peak value and keep driving method, time span hope being maintained peak current value is divided into multistage according to fixed time interval, and described fixed time interval is called step-length.When entering all the other each section except first paragraph, peak value keeps driving element first at inner power cutoff, by step-length timer reset, immediately again from inner power-on.Described step-length timer is used for monitoring the duration of each section.The application peak only improves peak current section, is divided into multistage, and final stage naturally can be transitioned into and keep electric current section.The method keeps driving element to carry out hardware modifications to existing peak value, just achieves the controllable precise of the random time length of peak current section, is specially adapted to the driving of the high-speed switch electromagnetic valve of automatic gearbox of vehicles.
Description
Technical field
The application relates to a kind of peak value for inductive load and keeps (Peak & Hold) driving method.
Background technology
Inductive load refers to the load of band inductance parameters, has the characteristic comparing a load current lagging load voltage phase difference with power supply.Inductive load needs one than the starting current maintaining the required electric current that runs well much bigger (usually at 3-7 doubly) when starting.Peak value keeps being a kind of comparatively advanced driving method for the inductive load such as electromagnetically operated valve, solenoid.
Refer to Fig. 1, this is the schematic diagram keeping driving method for the peak value of electromagnetically operated valve, and all the other inductive loads are similar.
When electromagnetically operated valve controlled unlatching time, spool (or other executive components) is stressed produces displacement with against the force of the spring and stiction to make to need to produce magnetic field to coil charges, this time needs larger peak value (Peak) electric current, to ensure that spool can respond fast.
After electromagnetically operated valve is opened, spool only needs less maintenance (hold) electric current that can maintain open position.
When electromagnetically operated valve controlled shutdown time, loss of voltage, keeps electric current also can rapidly disappear, and spool relies on spring force to be returned to scram position.
Above-mentioned peak value keeps driving method to implement complicated than common pulse-width modulation (PWM) driving, but control effects is better.Because usually all can require in application inductive load unlatching and the turn-off time as far as possible short, and peak value keeps driving method obviously to drive than pulse-width modulation on the turn-off time wanting much shorter, more easily meet application demand.
Refer to Fig. 2, realize peak value and keep the driving element of driving method generally to have three kinds of mode of operations.
The first does not regulate (NoRegulation) pattern, do not use complicated driving function under this pattern, and peak value keeps driving element just to use as switching tube, and electric current is only determined by load.
The second is pure maintenance (Holdonly) pattern, and under this pattern after receiving the power-on signal that outside sends, peak value keeps driving element just from inner power-on, and load current starts rising.Once after being raised to the maintenance current value of setting, peak value keeps driving element to start a maintenance timer in inside, and peak value keeps driving element from inner cut-out power supply simultaneously, and load current starts to decline.After maintenance timer reaches setting-up time, peak value keeps driving element again from inner power-on, and load current rises again.Once after being raised to the maintenance current value of setting, peak value keeps driving element again to start inner maintenance timer, simultaneously from inner cut-out power supply ...Continue and so forth, until receive the power-off signal that outside sends.Thus, the load current under pure Holdover mode presents the waveform of but small oscillations to keep current value for peak.
The third is that peak value keeps (Peak & Hold) pattern, and under this pattern after receiving the power-on signal that outside sends, peak value keeps driving element just from inner power-on, and load current starts rising.Once after being raised to the peak current value of setting, peak value keeps driving element to start a peak value timer in inside, and maintain load current with peak current value with the method for pure Holdover mode is the but small oscillations waveform of peak simultaneously.Once after peak value timer reaches setting-up time, peak value keeps driving element from inner power cutoff, and load current starts to decline.Once after dropping to the maintenance current value of setting, load current is maintained the but small oscillations waveform keeping current value to be peak by peak-holding circuit part again with the method for pure Holdover mode, until receive the power-off signal that outside sends.
Above-mentioned peak value keeps in driving element, keeps current value, keeps the timing of the timing of timer, peak current value, peak value timer all can arrange.But several grades of set points that existing peak value keeps driving element to only give quantity little for parameters are available, can not realize the controllable precise of arbitrary value.Such as, some inductive load needs peak current value to maintain long time range, and existing peak value keeps driving element cannot meet this demand.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of peak value and keep driving method, can realize holding time of the peak current value of random time length.
For solving the problems of the technologies described above, the time span that the application's peak value keeps driving method hope to be maintained peak current value is divided into multistage according to fixed time interval (being called step-length); When entering all the other each section except first paragraph, peak value keeps driving element first at inner power cutoff, by step-length timer reset, immediately again from inner power-on; Described step-length timer is used for monitoring the duration of each section.
When the time span that hope maintains peak current value is not the integral multiple of described step-length, then time span hope being maintained peak current value is divided into multiple step-length Duan Yuyi remainder section; The time span of described step-length section equals step-length; The time span of described remainder section is less than step-length; Described remainder section is as first paragraph.
When entering all the other each section except first paragraph, peak value keeps driving element first at inner power cutoff, by step-length timer reset, again from inner power-on after 15 ~ 25 microseconds.
The application's peak value keeps driving method only to improve peak current section, is divided into multistage, and final stage naturally can be transitioned into and keep electric current section.The method keeps driving element to carry out hardware modifications to existing peak value, just achieves the controllable precise of the random time length of peak current section, is specially adapted to the driving of the high-speed switch electromagnetic valve of automatic gearbox of vehicles.
Accompanying drawing explanation
Fig. 1 is the principle schematic that peak value keeps driving method;
Fig. 2 is the schematic diagram that peak value keeps three kinds of mode of operations of driving element;
Fig. 3 is the flow chart that the application's peak value keeps driving method;
Fig. 4 is the principle schematic that the application's peak value keeps driving method;
Fig. 5 is the experiment effect figure that the application's peak value keeps driving method.
Embodiment
Refer to Fig. 3, driving method will be kept to be described in detail to the application's peak value with a specific embodiment below.Fig. 4 is the schematic diagram of load current along with time fluctuation of embodiment described in Fig. 3, and Fig. 5 is the experimental verification oscillogram of embodiment described in Fig. 3.
Suppose that peak current value is maintained 8ms by some inductive load requirements, be then down to maintenance electric current.And existing peak value keeps driving element the timing of peak value timer can be set to 0.6ms, 0.9ms, 1.2ms.
Method according to the application, such as, be first set to step-length by 1.2ms, then duration (i.e. the duration of peak current section) 8ms hope being maintained peak current value is divided into multistage according to the step-length of 1.2ms.Because 8ms can not be divided exactly by 1.2ms, the remainder section that thus the division result step-length section that is 1.2ms by six durations and duration are 0.8ms is formed, and wherein remainder section is as first paragraph, and six step-length sections are as second to the 7th section.
Preferably, the timing of the peak value timer in driving element is kept by peak value to be set to step-length.
More preferably, the longest timing of the peak value timer in driving element is kept by peak value to be set to step-length.
After receiving the power-on signal that outside sends, peak value keeps driving element just from inner power-on, enters the first paragraph of peak current section;
From entering second segment until later each section time, peak value keeps driving element first at inner power cutoff, thus by step-length timer reset, immediately again from inner power-on.This section is preferably 15 ~ 25 microseconds from inner power cutoff to the time span of inner power-on, such as 20 microseconds.
Each section of duration is monitored by step-length timer.Described step-length timer can directly keep the peak value timer in driving element to replace with peak value.
At the 7th section of end, the duration of the peak current section of 8ms terminates, and keeps the existing peak value Holdover mode of driving element according to peak value, keeps electric current section by being naturally transitioned into.Transition method is: once after the step-length timer of final stage reaches setting-up time, and peak value keeps driving element from inner power cutoff, and load current starts to decline.Once after dropping to the maintenance current value of setting, load current is maintained the but small oscillations waveform keeping current value to be peak by peak-holding circuit part again with the method for pure Holdover mode, until receive the power-off signal that outside sends.
Can find further from Fig. 4, Fig. 5, after described peak current section is divided into multistage, may need through multistage, peak value keeps the current value of driving element slowly to increase, and reach peak current value, this is the process of a gradual change.In remaining embodiment, if step value arranges comparatively large or peak current value arranges less, also may only need through one section, peak value keeps the current value of driving element to reach peak current value.
The application's peak value keeps driving method to be particularly suitable for by the MCU(microcontroller of automobile) realize.All include in MCU and compare output register and register is set.Such as comparing output register is 16, then from 0 ~ 65535 always in the growth that constantly circulates, each cycle increased is 0.0125 microsecond.Identical with the value arranging register when comparing output register, then MCU can trigger an interruption, is used for performing peak value and keeps driving element to open from inside or the operation of power cutoff.By changing the value arranging register, the setting-up time of step-length timer just can be changed arbitrarily.
The application is to the splitting scheme of peak current section, both ensure that the waveform continuity of load current in peak current section, also make simultaneously its can automatic Transition to keeping electric current section (experimental verification waveform as shown in Figure 5), thus achieve the accurate control of the duration to arbitrary peak current section.
These are only the preferred embodiment of the application, and be not used in restriction the application.For a person skilled in the art, the application can have various modifications and variations.Within all spirit in the application and principle, any amendment done, equivalent replacement, improvement etc., within the protection range that all should be included in the application.
Claims (8)
1. peak value keeps a driving method, and it is characterized in that, the time span that hope is maintained peak current value by described method is divided into multistage according to fixed time interval, and described fixed time interval is called step-length; When entering all the other each section except first paragraph, peak value keeps driving element first at inner power cutoff, by step-length timer reset, immediately again from inner power-on; Described step-length timer is used for monitoring the duration of each section;
When the time span that hope maintains peak current value is not the integral multiple of described step-length, then time span hope being maintained peak current value is divided into multiple step-length Duan Yuyi remainder section; The time span of described step-length section equals step-length; The time span of described remainder section is less than step-length; Described remainder section is as first paragraph.
2. peak value according to claim 1 keeps driving method, it is characterized in that, when entering all the other each section except first paragraph, peak value keeps driving element first at inner power cutoff, by step-length timer reset, again from inner power-on after 15 ~ 25 μ s.
3. peak value according to claim 1 keeps driving method, it is characterized in that, described step-length timer keeps the peak value timer in driving element to replace with peak value.
4. peak value according to claim 1 keeps driving method, it is characterized in that, is kept by peak value the timing of the peak value timer in driving element to be set to step-length.
5. peak value according to claim 4 keeps driving method, it is characterized in that, is kept by peak value the longest timing of the peak value timer in driving element to be set to step-length.
6. peak value according to claim 1 keeps driving method, it is characterized in that, in the end one section of end, is naturally transitioned into and keeps electric current section; Transition method is: once after the step-length timer of final stage reaches setting-up time, and peak value keeps driving element from inner power cutoff, and load current starts to decline; Once after dropping to the maintenance current value of setting, load current is maintained the but small oscillations waveform keeping current value to be peak by peak-holding circuit part again with the method for pure Holdover mode, until receive the power-off signal that outside sends.
7. peak value according to claim 1 keeps driving method, it is characterized in that, through one or more snippets, peak value keeps the current value of driving element just can rise to peak current value.
8. peak value according to claim 1 keeps driving method, it is characterized in that, described step-length timer by MCU comparison output register and arrange register to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210489049.9A CN103051290B (en) | 2012-11-27 | 2012-11-27 | Peak value keeps driving method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210489049.9A CN103051290B (en) | 2012-11-27 | 2012-11-27 | Peak value keeps driving method |
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| Publication Number | Publication Date |
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| CN103051290A CN103051290A (en) | 2013-04-17 |
| CN103051290B true CN103051290B (en) | 2016-04-27 |
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| CN201210489049.9A Active CN103051290B (en) | 2012-11-27 | 2012-11-27 | Peak value keeps driving method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3272012B1 (en) * | 2015-03-18 | 2021-04-28 | Automatic Switch Company | Assuring dropout of solenoid valve controlled by peek-and-hold- driver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1989689A (en) * | 2004-07-23 | 2007-06-27 | 罗姆股份有限公司 | Peak hold circuit, motor drive/control circuit having the same, and motor apparatus having the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2993698B2 (en) * | 1990-03-20 | 1999-12-20 | 新日本無線株式会社 | Peak current hold circuit |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1989689A (en) * | 2004-07-23 | 2007-06-27 | 罗姆股份有限公司 | Peak hold circuit, motor drive/control circuit having the same, and motor apparatus having the same |
Non-Patent Citations (2)
| Title |
|---|
| 新型跨导型脉冲峰值保持器;郭永新等;《青岛大学学报》;20011231;第16卷(第4期);第104-106页 * |
| 适用于窄脉冲的跨导型峰值保持电路设计;刘华柏等;《光学技术》;20081231;第34卷;第233-235页 * |
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| CN103051290A (en) | 2013-04-17 |
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