CN102938619A - Polarity switching circuit - Google Patents
Polarity switching circuit Download PDFInfo
- Publication number
- CN102938619A CN102938619A CN2012102537500A CN201210253750A CN102938619A CN 102938619 A CN102938619 A CN 102938619A CN 2012102537500 A CN2012102537500 A CN 2012102537500A CN 201210253750 A CN201210253750 A CN 201210253750A CN 102938619 A CN102938619 A CN 102938619A
- Authority
- CN
- China
- Prior art keywords
- transistor switch
- current
- piezo
- activator
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a polarity switching circuit. The circuit comprises a first current-limiting resistor, a second current-limiting resistor, a first transistor switch, a second transistor switch, a third transistor switch, a fourth transistor switch, a fifth transistor switch, a sixth transistor switch, a first filter circuit and a second filter circuit, wherein a first current-limiting resistor and the second current-limiting resistor are connected with direct-current high voltage, the first transistor switch, the second transistor switch, the fourth transistor switch and the fifth transistor switch are respectively controlled by a first pulse width modulation signal and a second pulse width modulation signal, control ends of the third transistor switch and the sixth transistor switch are respectively connected with the first and the fourth transistor switches respectively, the first filter circuit is connected with the second transistor switch, the third transistor switch and one point of a piezoelectric actuator, the second filter circuit is connected with the fifth transistor switch, the fifth transistor switch and the other point of the piezoelectric actuator, and when the first pulse width modulation signal and the second pulse width modulation signal are subjected to high/low potential switching alternately, the output alternating-current voltage which can generate smooth alternating-current waves is input in contacts of the piezoelectric actuator.
Description
Technical field
The invention relates to a kind of polarity switching circuit, the output AC voltage that relates in particular to a kind of exportable level and smooth AC wave shape drives the polarity switching circuit of piezo-activator.
Background technology
Along with the progress of science and technology, all kinds of 3C Products have been regarded as promoting the important force of growing up in market.Unquestionable, such development trend will continue, and along with the progress of microelectric technique, 3C Product not only function is increasingly sophisticated, its size is also gradually in miniaturization, and portability also significantly improves thereupon, and therefore the user can make things convenient for easily and process every affairs with 3C Product.Recently, also developed so-called piezo-activator and be applied in the 3C Product, piezo-activator have voltage low, be not subjected to noise jamming, volume is little, reaction is fast, the heating less, precision is good, conversion efficiency is high and control many-sided advantages such as easy.
Piezo-activator needs an alternating voltage to come its effect is ordered about piezo-activator and carried out the periodicity high-speed motion usually, therefore in fact piezo-activator needs a drive system to drive, this drive system is changed the direct voltage that connects, and comes drive actuator with output AC voltage.See also Fig. 1, its for the known drive system that is used for driving piezo-activator circuit block diagram.As shown in Figure 1, known drive systems 1 is in order to DC input voitage V
DCConversion, and then produce output AC voltage V
O1And V
O2Drive piezo-activator 9 (shown in Fig. 2 A), and comprise a booster circuit 10, a voltage multiplying circuit 11 and a polarity switching circuit 12.Wherein booster circuit 10 is to connect DC input voitage V
DC, and utilize the energy storage of the switching running of internal switch element and the elements such as internal inductance, electric capacity and diode and filtering and with DC input voitage V
DCBoost into a transient voltage V
T11 of voltage multiplying circuits connect transient voltage V
T, and its times increased to a for example direct current high voltage V of 4 times
B12 of polarity switching circuits are with dc high voltage V
BConvert output AC voltage V to
O1And V
O2, to drive piezo-activator 9.
Consult clearly Fig. 2 A, 2B and Fig. 3, and cooperate Fig. 1, wherein Fig. 2 A is the internal circuit configuration figure of polarity switching circuit shown in Figure 1, and Fig. 2 B is the digital signal f shown in Fig. 2 A
SwCircuit running schematic diagram during for electronegative potential, Fig. 3 is the voltage timing waveform of Fig. 2 A or 2B.As shown in the figure, the polarity switching circuit 12 main dc high voltage V that connect
B, input direct-current low-voltage V
InAnd digital signal f
Sw, and convert output AC voltage V to
O1And V
O2To drive repeatedly start of piezo-activator 9, wherein, polarity switching circuit 12 can be comprised of the first current-limiting resistance R21, the second current-limiting resistance R22, the 3rd current-limiting resistance R23, the first transistor switch Q21, transistor seconds switch Q22, the 3rd transistor switch Q23, the 4th transistor switch Q24, the 5th transistor switch Q25, the 6th transistor switch Q26 and the 7th transistor switch Q27.
Whereby as digital controlled signal f
SwFor high potential (High) and when being sent to the control end of the first and the 6th transistor switch Q21, Q26, the first and the 6th transistor switch Q21 that is connected with earth terminal G, just conducting of Q26, because the first current-limiting resistance R21 system is connected with the first transistor switch Q21, therefore the branch road at the first current-limiting resistance R21 place just is connected to earth terminal G, this moment, the second and the 4th transistor switch Q22, Q24 can corresponding cut-off makes the branch road at the second current-limiting resistance R22 place because of dc high voltage V because the control end of itself connects with the branch road at the first current-limiting resistance R21 place
BAnd be in high potential, so the 3rd just conducting of transistor switch Q23 that is connected with the branch road at the second current-limiting resistance R22 place of its control end, simultaneously, the control end of the 7th transistor switch Q27 also is connected to the digital controlled signal f of high potential
SwSo the 7th transistor switch Q27 conducting, because the 3rd current-limiting resistance R23 system is connected with the 7th transistor switch Q27, so the branch road at the 3rd current-limiting resistance R23 place just is connected to earth terminal G, the control end of the 5th transistor switch Q25 system is connected with the branch road at the 3rd current-limiting resistance R23 place again, cause the 5th transistor switch Q25 cut-off, thus electric current will carry out along the direction of arrow, shown in Fig. 2 A.
As digital signal f
SwDuring for electronegative potential (Low), shown in Fig. 2 B, then the switch motion of all crystals pipe is opposite with Fig. 2 A, makes the direction of arrow of electric current direct of travel shown in Fig. 2 B, thus, and the output AC voltage V that polarity switching circuit 12 is exported
O1And V
O2On piezo-activator 9, can form ac square wave, that is output AC voltage V shown in Figure 3
O1With output AC voltage V
O2The waveform of subtraction value.
The output AC voltage V that exports when polarity switching circuit 12
O1And V
O2When on piezo-activator 9, forming ac square wave, because its voltage fast rise and fast-descending, so piezo-activator 9 is carried out quick charge, although quick charge can be so that piezo-activator 9 reaches the top of amplitude fast, the consume that increases electric power also simultaneously.In addition, because polarity switching circuit 12 is with ac square wave piezo-activator 9 to be carried out quick charge, so can have on the piezo-activator 9 with the vibrative situation generation of natural resonant frequency, this natural vibration meeting causes larger noise problem.
Therefore how to develop a kind of polarity switching circuit that improves above-mentioned known technology disappearance, real is present problem in the urgent need to address.
Summary of the invention
Main purpose of the present invention is that the output AC square wave drives piezo-activator in order to do solving the known polarity commutation circuit for a kind of polarity switching circuit is provided, and it is large to cause having power consumption, and piezo-activator can produce the disappearances such as noise when start.
For achieving the above object, better enforcement aspect of the present invention is a kind of polarity switching circuit, is that dc high voltage is converted to output AC voltage, to drive piezo-activator, comprises: the first current-limiting resistance connects dc high voltage; The second current-limiting resistance connects dc high voltage; The first transistor switch has the control end that connects the first pulse width modulation signal, is connected with the first current-limiting resistance and connects the current input terminal of dc high voltage and the current output terminal that is connected with earth terminal; The transistor seconds switch has the control end, the current input terminal that connect the first pulse width modulation signal, and the current output terminal that is connected with earth terminal; The 3rd transistor switch has the control end that is connected with current input terminal and first current-limiting resistance of the first transistor switch, the current input terminal that connects dc high voltage, and the current output terminal that is connected with the current input terminal of transistor seconds switch; The 4th transistor switch has the control end that connects the second pulse width modulation signal, is connected with the second current-limiting resistance and connects the current input terminal of dc high voltage and the current output terminal that is connected with earth terminal; The 5th transistor switch has and connects the second pulse duration wither control end, the current input terminal of varying signal and the current output terminal that is connected with earth terminal; The 6th transistor switch has the control end that is connected with current input terminal and second current-limiting resistance of the 4th transistor switch, the current input terminal that connects dc high voltage, and the current output terminal that is connected with the current input terminal of the 5th transistor switch; The first filter circuit is to be connected with the current input terminal of transistor seconds switch, current output terminal, piezo-activator contact and the earth terminal of the 3rd transistor switch; And second filter circuit, be connected with the current input terminal of the 5th transistor switch, current output terminal, another contact of piezo-activator and the earth terminal of the 6th transistor switch; Wherein when the first pulse width modulation signal and the second pulse width modulation signal carry out the switching of high potential and electronegative potential respectively alternately, formed level and smooth AC wave shape to each contact of piezo-activator after impelling output AC voltage via the first filter circuit and the second filter circuit filtering.
For achieving the above object, better enforcement aspect of the present invention provides a kind of polarity switching circuit in addition, is that dc high voltage is converted to output AC voltage, to drive piezo-activator, comprises: input the first pulse duration varying signal that withers; Input the second pulse width modulation signal; The first filter circuit is to receive to be converted to pulse wave electric voltage by dc high voltage, and is connected with the piezo-activator contact; And second filter circuit, be to receive to be converted to another pulse wave electric voltage by dc high voltage, and be connected with another contact of piezo-activator; Wherein wither varying signal and the second pulse width modulation signal when carrying out alternately the switching of high potential and electronegative potential respectively when the first pulse duration, formed level and smooth AC wave shape to each contact of piezo-activator after impelling output AC voltage via the first filter circuit and the second filter circuit filtering.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is the known circuit block diagram that is used for driving the drive system of piezo-activator.
Fig. 2 A is the internal circuit configuration figure of polarity switching circuit shown in Figure 1.
Fig. 2 B is the digital signal f shown in Fig. 2 A
SwCircuit running schematic diagram during for electronegative potential.
Fig. 3 is the voltage timing waveform of Fig. 2 A or 2B.
Fig. 4 A is the internal circuit configuration figure of the polarity switching circuit of preferred embodiment of the present invention.
Fig. 4 B is that the first pulse width modulation signal PWM1 shown in Fig. 4 A is electronegative potential, and the second pulse duration varying signal PWM2 system circuit running schematic diagram when being in high potential and electronegative potential switching state that withers.
Fig. 5 A-5C is the voltage sequential chart of Fig. 4 A and 4B.
Fig. 6 is that one of the first filter circuit shown in Fig. 4 A and the second filter circuit changes example.
Fig. 7 A-7B is that one of the polarity switching circuit shown in Fig. 4 A and the 4B changes example.
Fig. 8 is the enforcement aspect schematic diagram that the piezo-activator shown in Fig. 4 A is applied to a mechanism body.
The main element symbol description:
1: drive system
10: booster circuit
11: multiple circuit
4,12: polarity switching circuit
40: the first filter circuits
41: the second filter circuits
9: piezo-activator
90: braking plate
91: vibrate thin mould
92: pressure chamber
V
B-: dc high voltage
V
O1, V
O2, V
1, V
2: output AC voltage
V
DC: DC input voitage
V
T: transient voltage
V
Max: maximum voltage
f
Sw: digital signal
V
In: the input direct-current low-voltage
V
S1: the first switched voltage
V
S2: the second switched voltage
R21, R
1: the first current-limiting resistance
R22, R
2: the second current-limiting resistance
R23, R
3: the 3rd current-limiting resistance
R
4: the 4th current-limiting resistance
Q21, Q41: the first transistor switch
Q22, Q42: transistor seconds switch
Q23, Q43: the 3rd transistor switch
Q24, Q44: the 4th transistor switch
Q25, Q45: the 5th transistor switch
Q26, Q46: the 6th transistor switch
Q27: the 7th transistor switch
G: earth terminal
PWM1: the first pulse width modulation signal
PWM2: the first pulse width modulation signal
L
1: the first inductance
L
2: the second inductance
C
1: the first electric capacity
C
2: the second electric capacity
Embodiment
Some exemplary embodiments that embody feature ﹠ benefits of the present invention will be described in detail in the explanation of back segment.Be understood that the present invention can have in different aspects various variations, so its neither departing from the scope of the present invention, and explanation wherein and accompanying drawing are when the usefulness that explains in itself, but not in order to limit the present invention.
See also Fig. 4 A and 4B, wherein Fig. 4 A is the internal circuit configuration figure of the polarity switching circuit of preferred embodiment of the present invention, Fig. 4 B is that the varying signal PWM1 that withers of the first pulse duration shown in Fig. 4 A is electronegative potential, and the circuit running schematic diagram of the second pulse width modulation signal PWM2 system when being in high potential and electronegative potential switching state.Shown in Fig. 4 A and 4B, polarity switching circuit 4 is to connect a direct current high voltage V
B, and according to wither varying signal PWM2 and with dc high voltage V of one first pulse width modulation signal PWM1 and one second pulse duration
BBe converted to output AC voltage V
1And V
2, to drive repeatedly start of piezo-activator 9, wherein a dc high voltage V
BCan for example be exported by voltage multiplying circuit shown in Figure 1 11.Polarity switching circuit 4 mainly comprises a transistor switch Q41, a transistor seconds switch Q42, one the 3rd transistor switch Q43, one the 4th transistor switch Q44, one the 5th transistor switch Q45, one the 6th transistor switch Q46, one first filter circuit 40, one second filter circuit 41, one first current-limiting resistance R
1And one second current-limiting resistance R
2
The first current-limiting resistance R
1System connects dc high voltage V
BElectric energy, and be connected the second current-limiting resistance R with the current input terminal of the first transistor switch Q41 and the control end of the 3rd transistor switch Q43
2System connects dc high voltage V
BElectric energy, and be connected with the current input terminal of the 4th transistor switch Q44 and the control end of the 6th transistor switch Q46.
The control end system of the first transistor switch Q41 connects the first pulse width modulation signal PWM1, and the current input terminal system of the first transistor switch Q41 is through the first current-limiting resistance R
1Connect dc high voltage V
BElectric energy, the current output terminal of the first transistor switch Q41 system is connected with an earth terminal G.The control end system of transistor seconds switch Q42 connects the first pulse width modulation signal PWM1, the current input terminal system of transistor seconds switch Q42 is connected with the first filter circuit 40, and the current output terminal system of transistor seconds switch Q42 is connected with earth terminal G.The control end system of the 3rd transistor switch Q43 is connected with the current input terminal of transistor seconds switch Q41, and the current input terminal system of the 3rd transistor switch Q43 connects dc high voltage V
BElectric energy, the current output terminal of the 3rd transistor switch Q43 then is connected with the current input terminal of the first filter circuit 40 and transistor seconds switch Q42.The first filter circuit 40 is to be connected with a contact and the earth terminal G of piezo-activator 9.
The control end system of the 4th transistor switch Q44 connects the second pulse width modulation signal PWM2, and the current input terminal system of the 4th transistor switch Q44 is through the second current-limiting resistance R
2Connect dc high voltage V
BElectric energy, the current output terminal of the 4th transistor switch Q44 system is connected with an earth terminal G.The control end system of the 5th transistor switch Q45 connects the second pulse width modulation signal PWM2, the current input terminal system of the 5th transistor switch Q45 is connected with the second filter circuit 41, and the current output terminal system of the 5th transistor switch Q45 is connected with earth terminal G.The control end system of the 6th transistor switch Q46 is connected with the current input terminal of the 4th transistor switch Q44, and the current input terminal system of the 6th transistor switch Q46 connects dc high voltage V
BElectric energy, the current output terminal of the 6th transistor switch Q46 then is connected with the current input terminal of the second filter circuit 41 and the 5th transistor switch Q45.The second filter circuit 41 is to be connected with another contact and the earth terminal G of piezo-activator 9.See also Fig. 5 A, 5B and 5C, and cooperate Fig. 4 A and 4B, wherein Fig. 5 A, 5B and 5C system is respectively the voltage sequential chart of Fig. 4 A and 4B.Shown in Fig. 4 A, 4B, 5A, 5B and 5C, the first pulse width modulation signal PWM1 and the second pulse width modulation signal PWM2 system carry out the switching of high potential and electronegative potential alternately, that is when the first pulse width modulation signal PWM1 when carrying out the switching of high potential and electronegative potential, the second pulse width modulation signal PWM2 is electronegative potential, and withering varying signal PWM2 when carrying out the switching of high potential and electronegative potential when the second pulse duration, the first pulse duration varying signal PWM1 that withers is electronegative potential.
The high frequency that is in high potential and electronegative potential as the first pulse width modulation signal PWM1 switches, and the second pulse width modulation signal PWM2 is when being in electronegative potential, the second pulse duration is withered the electronegative potential of varying signal PWM2 will be so that the 4th transistor switch Q44 and the 5th transistor switch Q45 cut-off, and the 6th switch element Q46 can be because control end connection dc high voltage V
BElectric energy and conducting, simultaneously, the state system that the first pulse width modulation signal PWM1 is in the high frequency switching of high potential and electronegative potential makes the first transistor switch Q41, transistor seconds switch Q42 is in corresponding switching state with the 3rd transistor switch Q43, namely when the first transistor switch Q41 and transistor seconds switch Q42 conducting, the 3rd transistor switch Q43 is cut-off, otherwise, when the first transistor switch Q41 and transistor seconds switch Q42 cut-off, the 3rd transistor switch Q43 is conducting, thus when the first transistor switch Q41 and transistor seconds switch Q42 conducting meeting so that the direction of arrow of electric current direct of travel shown in Fig. 4 A.
Otherwise, when the second pulse duration high frequency that varying signal PWM2 is in high potential and electronegative potential that withers switches, and the first pulse width modulation signal PWM1 is when being in electronegative potential, then the switch motion of all crystals pipe is opposite, that is, the electronegative potential of the first pulse width modulation signal PWM1 will be so that the first transistor switch Q41 and transistor seconds switch Q42 cut-off, and the 3rd transistor switch Q43 can be because control end connects the high voltage V that flows automatically
BElectric energy and conducting, simultaneously, the state system that the second pulse width modulation signal PWM2 is in the high frequency switching of high potential and electronegative potential makes the 4th transistor switch Q44, the 5th transistor switch Q45 and the 6th transistor switch Q46 are in the state of switching, namely when the 4th transistor switch Q44 and the 5th transistor switch Q45 conducting, the 6th transistor switch Q46 is cut-off, anti-, when the 4th transistor switch Q44 and the 5th transistor switch Q45 cut-off, the 6th transistor switch Q46 is conducting, thus when the 4th transistor switch Q44 and the 5th transistor switch Q45 conducting meeting so that the direction of arrow of electric current direct of travel shown in Fig. 4 B.
Therefore when the first pulse duration varying signal PWM1 and the second pulse duration signal of varying signal PWM2 shown in Fig. 5 A that wither that wither, that is first pulse width modulation signal PWM1 and the second pulse width modulation signal PWM2 system when being reduced to gradually low frequency and being increased to high frequency gradually again by high frequency respectively, the first pulse width modulation signal PWM1 and the second pulse width modulation signal PWM2 just can make polarity switching circuit 4 with this dc high voltage V
BConversion is with the one second switched voltage V that is produced between the current output terminal of the current input terminal of transistor seconds switch Q42 and the 3rd transistor switch Q43
S2, and the one first switched voltage V that produces between the current output terminal of the current input terminal of the 5th transistor switch Q45 and the 6th transistor switch Q46
S1, and for example shown in Fig. 5 B, be the first switched voltage V of pulse wave electric voltage
S1With the second switched voltage V
S2Will be respectively being reduced to gradually low frequency by high frequency is increased to high frequency more gradually synchronously with the first pulse width modulation signal PWM1 and the second pulse width modulation signal PWM2, that is shown in Fig. 5 B, and the first switched voltage V
S1And the second switched voltage V
S2After the filtering via the second filter circuit 41 and the first filter circuit 40, namely get the output AC voltage V shown in Fig. 5 C respectively
1And V
2System presents level and smooth AC wave shape.
Consult clearly again Fig. 5 C, the driving electric energy that piezo-activator 9 connects, that is output AC voltage V
1And V
2Subtraction value be to reach maximum voltage V in the very first time internal linear that polarity switching circuit 4 has just begun start
MaxOne first ratio value, for example mark 1 is to mark 2, can present afterwards to rise round and smooth waveform and arrive maximum voltage V in one first setting-up time
Max, for example mark 2 then maintains an equal level within one second time to mark 3, and for example mark 3 is to mark 4, and continuing to present descends round and smooth waveform and be reduced to maximum voltage V in one second setting-up time
MaxOne second ratio value, for example mark 4 is to mark 5, last linearity drops to no-voltage, for example mark 5 is to mark 6, and as for the AC wave shape of second half cycle (in the other direction), that is mark 6 is to mark 11, therefore its characteristic system repeats no more in this similar in appearance to mark 1 to mark 6.In addition, the output AC voltage V that exports of polarity switching circuit 4
1And V
2Its waveform rise and fall speed of formed level and smooth AC wave shape, inflection circle slip circle degree and maximum voltage V on piezo-activator 9
MaxThe fair time all can change by the modulation pulse bandwidth of the first pulse width modulation signal PWM1 and the second pulse width modulation signal PWM2 and adjust.
Because the output AC voltage V that polarity switching circuit 4 of the present invention is exported
1And V
2System forms level and smooth AC wave shape and is connected on two contacts of piezo-activator 9, is not the output AC voltage V that the known polarity commutation circuit shown in Fig. 2 A is exported
O1And V
O2It is the formation square wave on piezo-activator 9, so the mode that can comparatively relax is progressively to piezo-activator 9 chargings, so can reduce the power loss that rapidly charging causes, in addition, also can reduce can have on the piezo-activator 9 with the vibrative situation of natural resonant frequency and occur, and then the noise problem of avoiding piezo-activator 9 when start, to produce.
In other embodiment, shown in Fig. 4 A, the first filter circuit 40 can be by one first inductance L
1And one first capacitor C
1Consist of the first inductance L wherein
1System is connected the first capacitor C with the current input terminal of piezo-activator 9, transistor seconds switch Q42 and the current output terminal of the 3rd transistor switch Q43
1Then with piezo-activator 9, the first inductance L
1And earth terminal G connects.The second filter circuit 41 can be by one second inductance L
2And one second capacitor C
2Consist of the second inductance L wherein
2System is connected the second capacitor C with the current input terminal of piezo-activator 9, the 5th transistor switch Q45 and the current output terminal of the 6th transistor switch Q46
2Then with piezo-activator 9, the second inductance L
2And earth terminal G connects.
In other embodiment, as shown in Figure 6, the first filter circuit 40 also can be only by the first capacitor C again
1Consist of the first capacitor C
1System is connected with a contact of piezo-activator 9, the current input terminal of transistor seconds switch Q42, current output terminal and the earth terminal G of the 3rd transistor switch Q43, and the second filter circuit 41 also can be only by the second capacitor C
2Consist of the second capacitor C
1System is connected with another contact of piezo-activator 9, the current input terminal of the 5th transistor switch Q45, current output terminal and the earth terminal G of the 6th transistor switch Q46.
In some embodiment, shown in Fig. 4 A, the first～the 6th transistor switch Q41～Q46 system can be respectively be made of the bipolar altogether junction transistor switch (BJT) of NPN, so control end, current input terminal and the current output terminal of first～the 6th transistor switch Q41～Q46 correspond to respectively base stage, collector electrode and emitter.Yet in other embodiment, shown in Fig. 7 A, 7B, first～the 6th transistor switch Q41～Q46 also can be made of field-effect transistor switch (FET), therefore control end, current input terminal and the current output terminal of first～the 6th transistor switch Q41～Q46 correspond to respectively grid and, source electrode and drain electrode, in addition, corresponding first～the 6th transistor switch Q41～Q46 is made of field-effect transistor switch (FET), and polarity switching circuit 4 has more one the 3rd current-limiting resistance R
3And one the 4th current-limiting resistance R
4, the 3rd current-limiting resistance R
3System is connected the 4th current-limiting resistance R with the control end of the first transistor switch Q41 and the control end of transistor seconds switch Q42
4System is connected with the 4th crystal switch Q44 and the 5th crystal switch Q45.Because the framework of the polarity switching circuit 12 shown in Fig. 7 A, the 7B is similar to Fig. 4 A, 4B figure to operation principles system, repeats no more in this.
See also Fig. 8, it is the enforcement aspect schematic diagram that the piezo-activator shown in Fig. 4 A is applied to a mechanism body, as shown in the figure, this mechanism body can be a fluid conveying device 8, but not as limit, fluid delivery system 8 is given birth to the industry such as skill, computer technology, printing or the energy applicable to medicine, can carry gas or liquid, the for example pumping in the ink-jet printer, mainly convert electric energy to mechanical energy by piezo-activator 9, wherein piezo-activator 9 includes braking plate 90 and vibrates thin mould 91, and connects respectively output AC voltage V
1And V
2, in order in response to output AC voltage V
1And V
2Driving and make braking plate 90 and vibrate thin mould 91 and produce perseverations, in order to do volume compression or the expansion of build-up of pressure chamber 92, make the fluid delivery system 8 can be so as to reaching the effect that transmits fluid.
In sum, polarity switching circuit of the present invention is to utilize the connection of the first～the 6th transistor switch and the first～the second filter circuit and the output AC voltage that start is output as level and smooth AC wave shape, reduce whereby power loss, and avoid piezo-activator when start, to produce noise.
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (11)
1. a polarity switching circuit is that a direct current high voltage is converted to an output AC voltage, and to drive a piezo-activator, this polarity switching circuit comprises:
One first current-limiting resistance connects this dc high voltage;
One second current-limiting resistance connects this dc high voltage;
One transistor switch has the control end that connects one first pulse width modulation signal, is connected with this first current-limiting resistance and connects a current input terminal of this dc high voltage and a current output terminal that is connected with an earth terminal;
One transistor seconds switch has and connects this first pulse duration wither a control end, a current input terminal of varying signal and a current output terminal that is connected with this earth terminal;
One the 3rd transistor switch, have a control end that is connected with this current input terminal and this first current-limiting resistance of this first transistor switch, a current input terminal that connects this dc high voltage, and a current output terminal that is connected with this current input terminal of this transistor seconds switch;
One the 4th transistor switch has the control end that connects one second pulse width modulation signal, is connected with this second current-limiting resistance and connects a current input terminal of this dc high voltage and a current output terminal that is connected with this earth terminal;
One the 5th transistor switch has and connects this second pulse duration wither a control end, a current input terminal of varying signal and a current output terminal that is connected with this earth terminal;
One the 6th transistor switch, have a control end that is connected with this current input terminal and this second current-limiting resistance of the 4th transistor switch, a current input terminal that connects this dc high voltage, and a current output terminal that is connected with this current input terminal of the 5th transistor switch;
One first filter circuit is connected with this current input terminal of this transistor seconds switch, this current output terminal of the 3rd transistor switch, a contact and this earth terminal of this piezo-activator; And
One second filter circuit is connected with this current input terminal of the 5th transistor switch, this current output terminal of the 6th transistor switch, another contact and this earth terminal of this piezo-activator;
Wherein when this first pulse width modulation signal and this second pulse width modulation signal carry out the switching of high potential and electronegative potential respectively alternately, formed level and smooth AC wave shape to each contact of this piezo-activator after impelling this output AC voltage via this first filter circuit and this second filter circuit filtering.
2. polarity switching circuit as claimed in claim 1, it is characterized in that, this first pulse duration is withered varying signal when carrying out the switching of high potential and electronegative potential, this the second pulse width modulation signal is electronegative potential, when this second pulse width modulation signal when carrying out the switching of high potential and electronegative potential, this first pulse width modulation signal is electronegative potential.
3. polarity switching circuit as claimed in claim 1 is characterized in that, wither varying signal and this second pulse width modulation signal of this first pulse duration is reduced to gradually low frequency by high frequency respectively and is increased to gradually high frequency again.
4. polarity switching circuit as claimed in claim 1, it is characterized in that, this first filter circuit is made of one first inductance and one first electric capacity, this contact of this first inductance and this piezo-activator, this current output terminal of this current input terminal of this transistor seconds switch and the 3rd transistor switch connects, this contact of this first electric capacity and this piezo-activator, this first inductance and this earth terminal connect, this second filter circuit is to be made of one second inductance and one second electric capacity, another contact of this of this second inductance and this piezo-activator, this current output terminal of this current input terminal of the 5th transistor switch and the 6th transistor switch connects another contact of this of this second electric capacity and this piezo-activator, this second inductance and this earth terminal connect.
5. polarity switching circuit as claimed in claim 1, it is characterized in that, this first filter circuit is made of one first electric capacity, this first electric capacity is connected with this contact of this piezo-activator, this current input terminal of this transistor seconds switch, this current output terminal and this earth terminal of the 3rd transistor switch, this second filter circuit is made of one second electric capacity, and this second electric capacity is connected with this another contact of this piezo-activator, this current input terminal of the 5th transistor switch, this current output terminal and this earth terminal of the 6th transistor switch.
6. polarity switching circuit as claimed in claim 1, it is characterized in that, this output AC voltage of level and smooth AC wave shape is one first ratio value that reaches a maximum voltage within the half period in a very first time internal linear, continue to present and rise round and smooth waveform and in one first setting-up time, arrive this maximum voltage, be connected in one second time and maintain an equal level, one second ratio value that continues and present the round and smooth waveform of decline and be reduced to maximum voltage in one second setting-up time, the linearity that continues drops to no-voltage.
7. a polarity switching circuit is that a direct current high voltage is converted to an output AC voltage, and to drive a piezo-activator, this polarity switching circuit comprises:
One input the first pulse duration varying signal that withers;
One input the second pulse width modulation signal;
One first filter circuit receives and is converted to a pulse wave electric voltage by this dc high voltage, and is connected with a contact of this piezo-activator; And
One second filter circuit is to receive to be converted to another pulse wave electric voltage by this dc high voltage, and is connected with another contact of this piezo-activator;
Wherein when this first pulse width modulation signal and this second pulse width modulation signal carry out the switching of high potential and electronegative potential respectively alternately, formed level and smooth AC wave shape to each contact of this piezo-activator after impelling this output AC voltage via this first filter circuit and this second filter circuit filtering.
8. polarity switching circuit as claimed in claim 7, it is characterized in that, this the first pulse width modulation signal is when carrying out the switching of high potential and electronegative potential, this second pulse duration varying signal that withers is electronegative potential, when this second pulse duration is withered varying signal when carrying out the switching of high potential and electronegative potential, this first pulse width modulation signal is electronegative potential.
9. polarity switching circuit as claimed in claim 7 is characterized in that, this first pulse width modulation signal and this second pulse width modulation signal are to be reduced to gradually low frequency by high frequency respectively to be increased to gradually high frequency again.
10. polarity switching circuit as claimed in claim 7, it is characterized in that, this first filter circuit is made of one first inductance and one first electric capacity, this first inductance is connected with a contact of this piezo-activator, this first electric capacity is connected with this contact, this first inductance and an earth terminal of this piezo-activator, this second filter circuit is to be made of one second inductance and one second electric capacity, this second inductance is connected with another contact of this piezo-activator, and this second electric capacity is connected with this another contact, this second inductance and this earth terminal of this piezo-activator.
11. polarity switching circuit as claimed in claim 7, it is characterized in that, this first filter circuit is made of one first electric capacity, this first electric capacity is connected with a contact and an earth terminal of this piezo-activator, this second filter circuit is made of one second electric capacity, and this second electric capacity is connected with another contact and this earth terminal of this piezo-activator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102537500A CN102938619A (en) | 2011-08-15 | 2012-07-03 | Polarity switching circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110246554 | 2011-08-15 | ||
| CN201110246554.6 | 2011-08-15 | ||
| CN2012102537500A CN102938619A (en) | 2011-08-15 | 2012-07-03 | Polarity switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102938619A true CN102938619A (en) | 2013-02-20 |
Family
ID=47697499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102537500A Pending CN102938619A (en) | 2011-08-15 | 2012-07-03 | Polarity switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102938619A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283451A (en) * | 2013-07-05 | 2015-01-14 | 研能科技股份有限公司 | Polarity switching circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0974771A (en) * | 1995-09-04 | 1997-03-18 | Toshiba Fa Syst Eng Kk | Inverter apparatus |
| WO2005122382A1 (en) * | 2004-06-11 | 2005-12-22 | Nokia Corporation | Driving circuit for piezoelectric motor |
| US20100301701A1 (en) * | 2009-05-26 | 2010-12-02 | Shih-Chang Chen | Voltage converter and driving system using such voltage converter |
-
2012
- 2012-07-03 CN CN2012102537500A patent/CN102938619A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0974771A (en) * | 1995-09-04 | 1997-03-18 | Toshiba Fa Syst Eng Kk | Inverter apparatus |
| WO2005122382A1 (en) * | 2004-06-11 | 2005-12-22 | Nokia Corporation | Driving circuit for piezoelectric motor |
| US20100301701A1 (en) * | 2009-05-26 | 2010-12-02 | Shih-Chang Chen | Voltage converter and driving system using such voltage converter |
Non-Patent Citations (1)
| Title |
|---|
| 庄磊: "数字功放H桥式输出电路的两类PWM比较", 《电声技术》, no. 10, 31 October 2004 (2004-10-31), pages 26 - 27 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283451A (en) * | 2013-07-05 | 2015-01-14 | 研能科技股份有限公司 | Polarity switching circuit |
| CN104283451B (en) * | 2013-07-05 | 2018-05-15 | 研能科技股份有限公司 | Polarity switching circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3595808B2 (en) | Voltage generating circuit and driving device provided with the circuit | |
| US8736142B2 (en) | Polarity switching circuit | |
| CN204046407U (en) | A kind of many level IGBT drive circuit | |
| CN102223061A (en) | Voltage converter | |
| CN101902144B (en) | Voltage converter and driving system applicable to the same | |
| CN102694483A (en) | LC (inductance/capacitance) resonance drive circuit for ultrasonic motor and control method of LC resonance drive circuit | |
| CN101060291B (en) | Transformer-free ultrasonic motor driver | |
| CN208386440U (en) | A kind of LC resonance supersonic motor frequency modulation phase modulation drive control circuit | |
| CN102938619A (en) | Polarity switching circuit | |
| CN102811020A (en) | Controller and method for controlling motor used for compressor | |
| CN105632388B (en) | power supply module, display and capacitance switching method thereof | |
| JP2009065663A (en) | High voltage, high speed and high pulse repetition rate pulse generator | |
| US9673735B2 (en) | Power converter | |
| CN104283451B (en) | Polarity switching circuit | |
| CN103001529B (en) | A kind of surge generator | |
| CN202424570U (en) | Inductance-capacitance (LC) resonant driving circuit for ultrasonic motor | |
| TWI524649B (en) | Polar switch circuit | |
| US20140042872A1 (en) | Polarity switching circuit | |
| CN101345493B (en) | Piezoelectricity type micro-pump and its driving circuit | |
| CN101984547B (en) | Silicon controlled chopping power regulation driving device | |
| CN101567640B (en) | Method and circuit for driving piezoelectric motor | |
| CN214380682U (en) | Main circuit of frequency converter | |
| CN111245291B (en) | Cylindrical stator ultrasonic motor transformerless LLC drive control circuit and method | |
| CN104052374A (en) | Driving signal generator and driving signal generating method | |
| CN101355316A (en) | Apparatus and method for generating AC signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130220 |