CN105429506A - Multilevel piezoelectric ceramics driving circuit and driving control method thereof - Google Patents
Multilevel piezoelectric ceramics driving circuit and driving control method thereof Download PDFInfo
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- CN105429506A CN105429506A CN201510908904.9A CN201510908904A CN105429506A CN 105429506 A CN105429506 A CN 105429506A CN 201510908904 A CN201510908904 A CN 201510908904A CN 105429506 A CN105429506 A CN 105429506A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/06—Drive circuits; Control arrangements or methods
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Abstract
The invention provides a multilevel piezoelectric ceramics driving circuit suitable for large power and a driving control method thereof. The multilevel piezoelectric ceramics driving circuit comprises an n-grade multilevel cascade module, a fixed-voltage direct current module and a push-pull amplification module, wherein the n-grade multilevel cascade module comprises n multilevel units which are successively connected in series and bus voltages are E, 2E, 4E... 2n-1E, and the E is a resolving voltage; the fixed-voltage direct current module is connected in series to an output terminal of the n-grade multilevel cascade module; a high voltage side of the push-pull amplification module is connected to a high voltage output terminal UH of the fixed-voltage direct current module and a low voltage side is connected to a low voltage output terminal UL of the fixed-voltage direct current module. In the invention, through using an anisobaric multilevel cascade mode, a low voltage device is used to output a voltage in a high range; a working frequency of a switch tube can be decreased along with the decrease of a frequency of an output voltage so that switch losses of the switch tube are reduced; simultaneously, power consumption of the push-pull amplification module can be greatly reduced and efficiency is increased.
Description
Technical field
The present invention relates to driving field, in particular to one many level driver circuit for piezoelectric ceramics and drived control method thereof.
Background technology
In recent years, the demand of the fields such as industry, aerospace, biology to hi-Fix and Driving technique is more and more obvious, and such as scanning probe microscopy, axis Nano-positioners and vibration control system etc., more and more higher to nanotechnology demand especially.One of scheme of nanotechnology adopts piezoelectric actuator as actuator.
Drive circuit based on many level block also applies to the high drive of piezoelectric actuator gradually, and current most many level driving circuits are all isobaric multi-level-cells.
Summary of the invention
The present invention aims to provide one and is suitable for powerful many level driver circuit for piezoelectric ceramics and drived control method thereof.
The present invention is while the output voltage range ensureing many level driving circuits, when output low frequency voltage or Static output, farthest can reduce the switching over number of times of multi-level-cell switching tube, to reduce the switching loss of switching tube, and make its modulator approach become more directly simple, propose a kind of successive approximation multi-level high-voltage and drive strategy.This driving strategy adopts the many level block of anisobaric, and the modulator approach of Approach by inchmeal, and the two-way voltage of output is powered to push-pull type amplifying circuit.
The object of the invention is to be achieved through the following technical solutions:
Successive approximation multi-level high-voltage drives a strategy, comprises anisobaric many level topological sum successive approximation and drives strategy.Push-pull type amplification module is received in the output of the topology of the many level of anisobaric, is its power supply; Push-pull type amplifying circuit is under the driving of drive singal, and the voltage Direct driver piezoelectric ceramic actuator of generation works; Drive plan to control the switching tube work of each multi-level circuit module according to successive approximation, the two output voltage expected can be obtained.
Anisobaric many level topology comprises fixed voltage DC Module and n level many level cascade module, and fixed voltage DC Module is positioned at the output of anisobaric many level topology, and is connected by series system with n level many level cascade module.The voltage of fixed voltage DC Module is Ud, the high voltage that its positive pole and negative pole are respectively anisobaric many level topology exports UH and low-voltage output UL, this two output voltage is connected to high-voltage side and the low voltage side of push-pull type amplification module, for its power supply, greatly can reduce the power loss of push-pull type amplification module like this, improve its efficiency.The busbar voltage of n multi-level-cell of n level many level cascade module is respectively E, 2E, 4E ... 2n-1E, and they are in series successively, then the output voltage range of n level many level cascade module is 0 ~ (2n-1) E.By adjusting the size of E, the resolution of adjustable many level topologys output voltage, selects the size of many level progression n, can adjust the scope of many level topology output voltage.Such anisobaric many level topological structure, only when output voltage needs to change, switching tube just carries out switching manipulation, and when output low frequency voltage, multi-level-cell switching tube is operated in low frequency; When Static output, switching tube does not need to carry out switching manipulation, can reduce the switching loss of switching tube like this.
Successive approximation drives strategy, convert desired output voltage U exp to n bit, the operating state of the switching tube of i-th correspondence, i-th multi-level-cell of n bit, 0 represents that upper pipe turns off and lower pipe is open-minded, and 1 represents that upper pipe is opened and lower pipe turns off.The first step, calculate the value of Uexp/E, obtain integer Sint, Sint represents n level many level cascade module will export Sint*E altogether to mate desired output voltage U exp.Second step, carries out Binary Conversion to Sint, obtains n bit Sbit.According to 0th ~ n-1 position corresponding switching tube work controlling 0th ~ n-1 level multi-level circuit module respectively of Sbit, can obtain the output voltage expected, such modulator approach becomes more directly simple.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is anisobaric multi-level high-voltage drive circuit schematic diagram of the present invention;
Fig. 2 is the block diagram that successive approximation of the present invention drives strategy;
Fig. 3 is output voltage schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further details.
As shown in Figure 1, a kind of successive approximation anisobaric multi-level high-voltage disclosed by the invention drives the anisobaric multi-level high-voltage drive circuit of strategy, and described anisobaric multi-level high-voltage drive circuit comprises fixed voltage DC Module, n level many level cascade module and push-pull type amplification module.Wherein, n level many level cascade module is connected by series system with fixed voltage DC Module, the two-way voltage of fixed voltage DC Module exports and is connected to push-pull type amplification module, and push-pull type amplification module is as the output of anisobaric multi-level high-voltage drive circuit.
The voltage of described fixed voltage DC Module is Ud, and the high voltage that its positive pole and negative pole are respectively anisobaric many level topology exports UH and low-voltage output UL, and this two output voltage is connected to high-voltage side and the low voltage side of push-pull type amplification module, is its power supply.
Described push-pull type amplification module is by drive singal V
drdrive, produce output voltage UO, with Direct driver piezoelectric ceramic actuator.The voltage follow drive singal V of UO
drchange and change, but be exaggerated power output.By regulating V
drvoltage can regulate the output voltage UO of push-pull type amplification module.
The busbar voltage of n multi-level-cell of described n level many level cascade module is respectively E, 2E, 4E ... 2n-1E, and they are in series successively, then the output voltage range of n level many level cascade module is 0 ~ (2n-1) E.
The transformable minimum voltage of output voltage is E, and by adjusting the size of E, namely the resolution of adjustable many level topologys output voltage, selects the size of many level progression n, can adjust the scope of many level topology output voltage.To select E=5V, n=8 is example, and the scope of output voltage is 0V ~ 1275V, and resolution is 5V.
As shown in Figure 2, successive approximation disclosed by the invention drives strategy, and in order to desired output voltage U exp being converted to the control signal controlling each multi-level-cell switching tube, described successive approximation drives strategy to carry out as follows.
The first step, calculate the value of Uexp/E, obtain integer Sint, Sint represents n level many level cascade module will export Sint*E altogether to mate desired output voltage U exp.
Second step, carries out Binary Conversion to Sint, obtains n bit Sbit.
3rd step, produces 0 ~ n-1 road control signal g respectively according to 0th ~ n-1 position of Sbit, and g [i]=Sbit [i].
4th step, control signal g [i] controls the switching tube work of multi-level-cell i, and as g [i]=1, the upper pipe of corresponding multi-level-cell is opened and lower pipe turns off, and on the contrary, as g [i]=0, the upper pipe of corresponding multi-level-cell turns off and lower pipe is open-minded.So can obtain the output voltage expected.
Be illustrated in figure 3 anisobaric many level topologys output voltage schematic diagram, described high voltage exports UH and low-voltage output UL and all increases gradually with minimum change voltage E and reduce, and the moment maintains the voltage difference that size is Ud.Because the high voltage of anisobaric many level topology exports UH and low-voltage output UL, for the high-voltage side of push-pull type amplification module and low voltage side are powered, ensure whenever UH and UL does not overlap in size, and when multiple switching tube carries out switching manipulation together time, cannot ensure that switching tube is opened definitely simultaneously or turns off, then require Ud>E.For making push-pull type amplification module controlling there are enough margin voltage when exporting, when choosing E=5V, margin voltage is when being 5V, can select Ud=10V.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
1, adopt the mode of anisobaric many level cascade, can export the voltage of high scope with low-voltage device, the operating frequency of switching tube can reduce with the frequency of output voltage and reduce, and reduces the switching loss of switching tube.
2, power to push-pull type amplification module with the two-way adjustable voltage with fixed voltage difference, greatly can reduce the power loss of push-pull type amplification module, improve its efficiency.
3, adopt the modulator approach of Approach by inchmeal, make it modulate and become more directly simple.
4, during Static output, because do not have the switching manipulation of switching tube, output voltage does not have high-frequency harmonic, does not need filtering.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the driver circuit for piezoelectric ceramics of level more than, is characterized in that, comprise,
N level many level cascade module, fixed voltage DC Module and push-pull type amplification module;
Described n level many level cascade module comprises and being arranged in series successively, and busbar voltage is respectively E, 2E, 4E ... 2
n-1n the multi-level-cell of E, E is for differentiating voltage;
Described fixed voltage DC Module, is connected in series in the output of described n level many level cascade module;
The high-voltage side of described push-pull type amplification module is connected to fixed voltage DC Module high-voltage output terminal UH, and its low voltage side is connected to the low-voltage output end UL of fixed voltage DC Module.
2. many level driver circuit for piezoelectric ceramics according to claim 1, is characterized in that,
Each described multi-level-cell comprises the first switching tube be connected with high-pressure side and the second switch pipe be connected with low-pressure side, and described first switching tube is connected with the low-pressure side of multi-level-cell described in upper level respectively with described second switch pipe;
Described first switching tube of multi-level-cell described in the first order is connected with the low-pressure side of described fixed voltage DC Module respectively with described second switch pipe.
3. many level driver circuit for piezoelectric ceramics according to claim 1, is characterized in that,
The voltage of described fixed voltage DC Module is Ud, wherein, and Ud > E.
4. many level driver circuit for piezoelectric ceramics according to claim 3, is characterized in that, Ud=2E.
5. a drived control method for the driver circuit for piezoelectric ceramics of level more than, is characterized in that, described method comprises:
Step S1, calculates Uexp/E and rounds and obtain integer Sint, and wherein, Uexp is for expecting output voltage, and E is for differentiating voltage;
Step S2, carries out Binary Conversion by Sint, obtains n bit Sbit;
Step S3, produces 0 ~ n-1 road control signal g according to 0th ~ n-1 position correspondence of Sbit, and g [i]=Sbit [i];
Step S4, controls the switching tube work of i-th grade of described multi-level-cell by control signal g [i], wherein, as g [i]=1, the first switching tube conducting of i-th grade of described multi-level-cell and second switch pipe turn off; As g [i]=0, the first switching tube of i-th grade of described multi-level-cell turns off and the conducting of second switch pipe.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113012A (en) * | 2019-05-05 | 2019-08-09 | 武汉大学 | A kind of circuit topology and method improving linear power amplifier efficiency |
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| CN110113012B (en) * | 2019-05-05 | 2022-02-01 | 武汉大学 | Circuit topology and method for improving efficiency of linear power amplifier |
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| CN105429506B (en) | 2018-06-15 |
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