CN104283451B - Polarity switching circuit - Google Patents
Polarity switching circuit Download PDFInfo
- Publication number
- CN104283451B CN104283451B CN201310281893.7A CN201310281893A CN104283451B CN 104283451 B CN104283451 B CN 104283451B CN 201310281893 A CN201310281893 A CN 201310281893A CN 104283451 B CN104283451 B CN 104283451B
- Authority
- CN
- China
- Prior art keywords
- pulse width
- modulation signal
- width modulation
- transistor
- transistor switch
- 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.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The present invention is on a kind of polarity switching circuit, include first to fourth transistor switch and first to fourth filter circuit, first and the 4th transistor switch by the first pulse width modulation signal control, second and third transistor switch is controlled by the second pulse width modulation signal, second and the 4th transistor switch connection DC high voltage and respectively connection first and the 3rd transistor switch, first filter circuit is switched with first and second transistor, the contact connection of piezo-activator, second filter circuit and the 3rd and the 4th transistor switch, another contact connection of piezo-activator, wherein when the first and second pulse width modulation signal alternately carries out the switching of high levle and low level, the alternating voltage that smooth AC wave shape can be produced by promoting output AC voltage is inputted to each contact of piezo-activator.
Description
Technical field
The present invention comes on a kind of polarity switching circuit, the output AC voltage of espespecially a kind of exportable smooth AC wave shape
Drive the polarity switching circuit of piezo-activator.
Background technology
With the development of science and technology all kinds of 3C Products have been considered as promoting the important force of market growth.Unquestionable, this
The development trend of sample will continue, and with the progress of microelectric technique, not only function is increasingly sophisticated for 3C Product, its ruler
It is very little also gradually in miniaturization, and portability also greatly improves therewith, therefore user can conveniently easily be handled each with 3C Product
Item affairs.Recently, piezo-activator also has been developed to be applied in 3C Product, piezo-activator have voltage it is low, from miscellaneous
Many advantages such as news are disturbed, is small, reaction is fast, generate heat less, precision is good, high conversion efficiency and control are easy.
Piezo-activator usually requires an alternating voltage to act on it and to drive piezo-activator to carry out periodically high
Speed movement, therefore actually piezo-activator needs a drive system to drive, the DC voltage which will be connected
Changed, actuator is driven with output AC voltage.Referring to Fig. 1, it is the known drive for being used for driving piezo-activator
The circuit block diagram of dynamic system.As shown in Figure 1, known drive systems 1 are DC input voitage VDC to be changed, and then produce
Output AC voltage Vo1 and Vo2 is given birth to drive piezo-activator 9 (as shown in Figure 2 A), and includes a booster circuit 10, a voltage
11 and one polarity switching circuit 12 of multiple circuit.Wherein booster circuit 10 connects DC input voitage VDC, and utilizes internal switch
The switching running and the energy storage of the element such as internal inductance, capacitance and diode of element are with filtering and by DC input voitage VDC
Boost into a transient voltage VT.Voltage multiplying circuit 11 then connects transient voltage VT, and its times is increased to such as 4 times of a direct current
High voltage VB.DC high voltage VB is then converted into output AC voltage Vo1 and Vo2 by polarity switching circuit 12, to drive piezoelectricity
Actuator 9.
Fig. 2A, 2B and Fig. 3 are referred to, and coordinates Fig. 1, wherein Fig. 2A is the inside electricity of the polarity switching circuit shown in Fig. 1
Line structure figure, Fig. 2 B are the circuit running schematic diagram when digital signals fsw shown in Fig. 2A is low level, and Fig. 3 is Fig. 2A or figure
The voltage timing waveform of 2B.As shown in the figure, mainly to connect DC high voltage VB, input direct-current low for known polarity switching circuit 12
Voltage Vin and digital signals fsw, and output AC voltage Vo1 and Vo2 are converted into, to drive the start repeatedly of piezo-activator 9,
Wherein, polarity switching circuit 12 can be by the first current-limiting resistance R21, the second current-limiting resistance R22, the 3rd current-limiting resistance R23, the first electricity
Crystal switch Q21, the second transistor 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 are formed.
Thereby when numerical digit control signal fsw for high levle (High) and be sent to first and the 6th transistor switch Q21,
During the control terminal of Q26, be connected with ground terminal G first and the 6th transistor switch Q21, Q26 just turn on, due to the first current limliting electricity
Resistance R21 is connected with the first transistor switch Q21, therefore the branch where the first current-limiting resistance R21 is just connected to ground terminal G, this
When second and the 4th transistor switch Q22, Q24 can be because the branch where the control terminal of itself and the first current-limiting resistance R21 connects
Connect and correspond to cut-off, the branch where making the second current-limiting resistance R22 is in high levle because of DC high voltage VB, therefore it is controlled
The 3rd transistor being connected with the branch where the second current-limiting resistance R22 switch Q23 is held just to turn on, meanwhile, the 7th transistor is opened
The control terminal for closing Q27 is also connected to the numerical digit control signal fsw of high levle, therefore the 7th transistor switch Q27 is turned on, because of the 3rd limit
Leakage resistance R23 is connected with the 7th transistor switch Q27, therefore the branch where the 3rd current-limiting resistance R23 is just connected to ground terminal G,
The control terminal of the 5th transistor switch Q25 is connected with the branch where the 3rd current-limiting resistance R23 again, causes the 5th transistor to switch
Q25 ends, so electric current will carry out in the direction of the arrow, as shown in Figure 2 A.
When digital signals fsw is low level (Low), as shown in Figure 2 B, then all transistor switch motions and Fig. 2A phases
Instead, the direction of arrow of electric current direct of travel as shown in Figure 2 B is made, consequently, it is possible to the output exchange that polarity switching circuit 12 is exported
Voltage Vo1 and Vo2 is in can form ac square wave on piezo-activator 9, that is, the output AC voltage Vo1 shown in Fig. 3 and output
The waveform of alternating voltage Vo2 subtraction values.
When the output AC voltage Vo1 and Vo2 that known polarity switching circuit 12 is exported is handed in formation on piezo-activator 9
When flowing square wave, due to its voltage rapid increase and rapid decrease, therefore quick charge is carried out to piezo-activator 9, although quickly filling
Electricity can make it that piezo-activator 9 is rapidly achieved the top of amplitude, but at the same time but also the consume of increase electric power.Further, since
Know polarity switching circuit 12 with ac square wave to piezo-activator 9 carry out quick charge, therefore on piezo-activator 9 can have with
The situation that natural resonant frequency produces vibration occurs, this natural vibration can cause larger noise problem.What is more, due to known
Polarity switching circuit 12 need to be switched to form using more transistor, that is, 7 shown in Fig. 2A transistor switchs, and not only leads
Cause the production cost of known polarity switching circuit 12 to improve, also increase polarity switching circuit 12 because multiple transistors switch is carrying out
Switching loss caused by or off switching.
Therefore how to develop a kind of polarity switching circuit for improving above-mentioned known technology missing, actually at present there is an urgent need to
The problem of solution.
The content of the invention
The main object of the present invention is handed over to provide a kind of polarity switching circuit with solving known polarity switching circuit system output
Stream square wave drives piezo-activator, causes big with power consumption, and piezo-activator can produce noise in start, this
Outside, because known polarity switching circuit needs more transistor switch to form, being produced into for known polarity switching circuit is caused
This raising, switching loss are also larger etc. to be lacked.
In order to achieve the above object, the broader embodiment aspect of the present invention is a kind of polarity switching circuit of offer, by direct current height
Voltage conversion is output AC voltage, to drive piezo-activator, comprising：First switch circuit, receives the first pulse width tune
Become signal and the second pulse width modulation signal, wherein the first pulse width modulation signal and the second pulse width modulation signal are mutual
One end for anti-phase conducting, and first switch circuit is connected with ground terminal, other end connection DC high voltage；Second switch electricity
Road, receives the first pulse width modulation signal and the second pulse width modulation signal, wherein the first pulse width modulation signal with
The anti-phase conducting each other of second pulse width modulation signal, and one end of second switch circuit is connected with ground terminal, other end connection
DC high voltage；First filter circuit, is connected with first switch circuit, the contact of piezo-activator and ground terminal；And second
Filter circuit, is connected with another contact and ground terminal of second switch circuit, piezo-activator；Wherein when the first pulse width tune
When becoming signal and the second pulse width modulation signal and alternately carrying out the switching of high levle and low level, promote to export alternating current
The alternating voltage that pressure energy produces smooth AC wave shape is inputted to each contact of piezo-activator.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the known drive system for being used for driving piezo-activator.
Fig. 2A is the internal circuit configuration figure of the polarity switching circuit shown in Fig. 1.
Fig. 2 B are the circuit running schematic diagram when digital signals fsw shown in Fig. 2A is low level.
Fig. 3 is the voltage timing waveform of Fig. 2A or Fig. 2 B.
Fig. 4 A are the internal circuit configuration figure of the polarity switching circuit of present pre-ferred embodiments.
Fig. 4 B are that the first pulse width modulation signal PWM1 shown in Fig. 4 A is low level, and the second pulse width modulation is interrogated
Number PWM2 is in circuit running schematic diagram when high levle and low level switching state.
Fig. 5 A- Fig. 5 C are the voltage sequence diagram of Fig. 4 A and Fig. 4 B.
Fig. 6 is a change case of the first filter circuit and the second filter circuit shown in Fig. 4 A.
Fig. 7 A- Fig. 7 B are a change case of the polarity switching circuit shown in Fig. 4 A and Fig. 4 B.
Fig. 8 is implementation aspect schematic diagram of the piezo-activator shown in Fig. 4 A applied to a mechanism body.
【Symbol description】
1：Drive system
10：Booster circuit
11：Multiple circuit
4、12：Polarity switching circuit
40：First filter circuit
41：Second filter circuit
8：Fluid delivery system
9：Piezo-activator
90：Braking plate
91：Vibrate thin mould
92：Pressure chamber
VB-：DC high voltage
Vo1、Vo2、V1、V2：Output AC voltage
VDC：DC input voitage
VT：Transient voltage
Vmax：Maximum voltage
fsw：Digital signals
Vin：Input direct-current low-voltage
Vs1：First switching voltage
Vs2：Second switching voltage
R21：First current-limiting resistance
R22：Second current-limiting resistance
R23：3rd current-limiting resistance
Q21、Q41：First transistor switchs
Q22、Q42：Second transistor switchs
Q23、Q43：3rd transistor switchs
Q24、Q44：4th transistor switchs
Q25：5th transistor switchs
Q26：6th transistor switchs
Q27：7th transistor switchs
G：Ground terminal
PWM1：First pulse width modulation signal
PWM2：First pulse width modulation signal
L1：First inductance
L2：Second inductance
C1：First capacitance
C2：Second capacitance
Embodiment
Embodying some exemplary embodiments of feature of present invention and advantage will describe in detail in the explanation of back segment.It should be understood that
Be the present invention can different in terms of on there is various changes, right its neither departs from the scope of the present invention, and theory therein
Bright and attached drawing inherently is illustrated as being used, and is not used to the limitation present invention.
Fig. 4 A and Fig. 4 B are referred to, wherein Fig. 4 A are the internal circuit knot of the polarity switching circuit of present pre-ferred embodiments
Composition, Fig. 4 B are that polarity switching circuit shown in Fig. 4 A in the first pulse width modulation signal PWM1 is low level, and the second arteries and veins
It is circuit running schematic diagram when being in high levle and low level switching state to rush width modulation signal PWM2.Such as Fig. 4 A and Fig. 4 B
Shown, polarity switching circuit 4 connects a DC high voltage VB, and according to one first pulse width modulation signal PWM1 and 1 the
Two pulse width modulation signal PWM2 and DC high voltage VB is converted into output AC voltage V1 and V2, to drive a piezoelectricity
The start repeatedly of actuator 9, wherein DC high voltage VB can for example as shown in Figure 1 voltage multiplying circuit 11 exported.Polarity is cut
Circuit 4 is changed mainly comprising one first transistor switch Q41, one second transistor switch Q42, one the 3rd transistor switch Q43, one
4th transistor switch Q44, one first filter circuit 40, one second filter circuit 41.
A control terminal of first transistor switch Q41 connects the first pulse width modulation signal PWM1, and the first transistor is opened
The current input terminal for closing Q41 is connected with the first filter circuit 40, a current output terminal of the first transistor switch Q41 and ground connection
Hold G connections.The control terminal of second transistor switch Q42 connects the second pulse width modulation signal PWM2, the second transistor switch
The electric energy of the current input terminal connection DC high voltage VB of Q42, a current output terminal of the second transistor switch Q42 is then with the
The current input terminal connection of one filter circuit 40 and the first transistor switch Q41.First filter circuit 40 and piezo-activator 9
A contact (Rreceive output alternating voltage V2) and ground terminal G connections.
A control terminal of 3rd transistor switch Q43 connects the second pulse width modulation signal PWM2, and the 3rd transistor is opened
The current input terminal for closing Q43 is connected with the second filter circuit 41, a current output terminal of the 3rd transistor switch Q43 and ground connection
Hold G connections.The control terminal of 4th transistor switch Q44 connects the first pulse width modulation signal PWM1, the 4th transistor switch
The electric energy of the current input terminal connection DC high voltage VB of Q44, a current output terminal of the 4th transistor switch Q44 is then with the
The current input terminal connection of two filter circuits 41 and the 3rd transistor switch Q43.Second filter circuit 41 and piezo-activator 9
Another contact (Rreceive output alternating voltage V1) and ground terminal G connections.In above-described embodiment, the first transistor switch Q1 and
First transistor switch Q2 may make up first switch circuit, and the 3rd transistor switch Q3 and the first transistor switch Q4 may make up the
Two on-off circuits.
Fig. 5 A, Fig. 5 B and Fig. 5 C are referred to, and coordinates Fig. 4 A and Fig. 4 B, wherein Fig. 5 A, Fig. 5 B and Fig. 5 C are respectively Fig. 4 A
And the voltage sequence diagram of Fig. 4 B.As shown in Fig. 4 A, Fig. 4 B, Fig. 5 A, Fig. 5 B and Fig. 5 C, the first pulse width modulation signal PWM1 with
And second pulse width modulation signal PWM2 be the switching for alternately carrying out high levle and low level, that is, when the first pulse width
For modulation signal PWM1 when carrying out the switching of high levle and low level, the second pulse width modulation signal PWM2 is low level, and
When the second pulse width modulation signal PWM2 is carrying out the switching of high levle and low level, the first pulse width modulation signal
PWM1 is low level, and in other words, i.e. the first pulse width modulation signal PWM1 and the second pulse width modulation signal PWM2 are mutual
For anti-phase conducting.
The high frequency that high levle and low level are in as the first pulse width modulation signal PWM1 switches, and the second pulse width
When modulation signal PWM2 is in low level, the low level of the second pulse width modulation signal PWM2 will be so that the second transistor switch
Q42 and the switch Q43 cut-offs of the 3rd transistor, meanwhile, the first pulse width modulation signal PWM1 is in high levle and low level
The state of high frequency switching is the first transistor switch Q41 is in identical on or off with the 4th transistor switch Q44
Switching state, i.e. the first transistor switch Q41 and the 4th transistor and switch Q44 be conducting state or cut-off state at the same time, because
This can cause electric current direct of travel as shown in Figure 4 A when the first transistor switchs Q41 and the 4th transistor switch Q44 to turn on
The direction of arrow.
Conversely, the high frequency that high levle and low level are in as the second pulse width modulation signal PWM2 switches, and the first arteries and veins
When rushing width modulation signal PWM1 and being in low level, then all transistor switch motions are on the contrary, that is, the first pulse width modulation
The low level of signal PWM1 will cause the first transistor switch Q41 and the switch Q44 cut-offs of the 4th transistor, meanwhile, the second pulse
The state that width modulation signal PWM2 is in the high frequency switching of high levle and low level makes the second transistor electricity of switch Q42 and the 3rd
Crystal switch Q43 is in the switching state of identical on or off, i.e. the second transistor switch Q42 and the 3rd transistor switch
Q43 is conducting state or cut-off state at the same time, therefore when the second transistor switch Q42 and the 3rd transistor switch Q43 are conducting
When, it can cause the direction of arrow of electric current direct of travel as shown in Figure 4 B.
Therefore when the first pulse width modulation signal PWM1 and the second pulse width modulation signal PWM2 as shown in Figure 5A
Signal, that is, the first pulse width modulation signal PWM1 and the second pulse width modulation signal PWM2 is gradually reduced by high frequency respectively
When tremendously low frequency gradually rises tremendously high frequency again, in the current input terminal and the second transistor switch Q42 of the first transistor switch Q41
Current output terminal between caused by one second switching voltage Vs2, and the 3rd transistor switch Q43 current input terminal and
One first switching voltage Vs1 caused by the current output terminal of 4th transistor switch Q44, it will respectively with the first pulse width
Modulation signal PWM1 and the second pulse width modulation signal PWM2 it is synchronous and by high frequency be gradually decrease to low frequency gradually rise again to
High frequency, that is, as shown in Figure 5 B, and the first switching voltage Vs1 and the second switching voltage Vs2 are respectively via the second filter circuit 41
And first filter circuit 40 filtering after, smooth waves AC is presented up to the output AC voltage V1 and V2 shown in Fig. 5 C
Shape.
Referring again to Fig. 5 C, driving electric energy that piezo-activator 9 is connected, that is, the phase of output AC voltage V1 and V2
Depreciation is just to have started one first ratio that linearly reaches maximum voltage Vmax in a first time of start in polarity switching circuit 4
Value, such as mark 1 is to 2 section of mark, can present and rise after round and smooth waveform and reached most in the 3 one the first setting time of mark
Big voltage Vmax, such as mark 2 is to mark 3, then in maintaining an equal level in one second time, such as mark 3, to mark 4, continue presentation
Decline round and smooth waveform and in one second ratio value that maximum voltage Vmax is reduced in one second setting time, for example, mark 4 to
Mark 5, last linear decline to no-voltage, such as mark 5 are to mark 6, as the AC wave shape of another half period (opposite direction),
That is, mark 6, to mark 11, its characteristic is repeated no more similar in appearance to mark 1 to mark 6 in this.In addition, polarity switching circuit
The 4 output AC voltage V1 and V2 exported are in smooth AC wave shape its waveform rising formed on piezo-activator 9 with
Reduction of speed degree, inflection circle slip circle degree and maximum voltage Vmax the fair time all can via the first pulse width modulation signal PWM1 with
And second pulse width modulation signal PWM2 modulation pulse bandwidth change be adjusted.
Since output AC voltage V1 and V2 that the polarity switching circuit 4 of the present invention is exported are to form smooth AC wave shape
It is connected on two contacts of piezo-activator 9, the output that not known polarity switching circuit as shown in Figure 2 A is exported
Alternating voltage Vo1 and Vo2 is in being to form square wave on piezo-activator 9, therefore the mode that can more relax is progressively to piezoelectric actuated
Device 9 charges, and can so reduce the caused power loss that rapidly charges, in addition, can also reduce on piezo-activator 9 can have with
The situation that natural resonant frequency produces vibration occurs, and then avoids the caused noise problem in start of piezo-activator 9, this
Outside, need to be switched compared to the known polarity switching circuit 12 shown in Fig. 2A using the transistor of seven to form, pole of the invention
Property switching circuit 4 only need to switch (first to fourth transistor switchs Q41~Q44) using four transistors, therefore the present invention
The production cost of polarity switching circuit 4 can reduce, at the same can reduce polarity switching circuit because of transistor switch being turned on or
Switching loss caused by cut-off switching.
In other embodiment, as shown in Figure 4 A, the first filter circuit 40 can be by one first inductance L1 and one first capacitance
C1 is formed, wherein one end of the first inductance L1 is opened with the current input terminal of the first transistor switch Q41 and the second transistor
Close the current output terminal connection of Q42, one end of the first capacitance C1 and a contact of piezo-activator 9 and the first inductance L1's is another
End connection, the other end of the first capacitance C1 are then connected with ground terminal G.Second filter circuit 41 can be by one second inductance L2 and 1
Two capacitance C2 are formed, wherein one end of the second inductance L2 and the current input terminal and the 4th electricity of the 3rd transistor switch Q43
The current output terminal connection of crystal switch Q44, one end of the second capacitance C2 and another contact of piezo-activator 9 and the second inductance
The other end connection of L2, the other end of the second capacitance C2 are then connected with ground terminal G.
Again in other embodiment, as shown in fig. 6, the first filter circuit 40 also can be only made of the first capacitance C1, this
When the first capacitance C1 one end and piezo-activator 9 a contact, the current input terminal and the second electricity of the first transistor switch Q41
The current output terminal connection of crystal switch Q42, the other end of the first capacitance C1 then maintain to be connected with ground terminal G, the second filtered electrical
Road 41 also can be only made of the second capacitance C2, at this time another contact, the 3rd transistor of the second capacitance C2 and piezo-activator 9
The current output terminal connection of the current input terminal and the 4th transistor switch Q44 of Q43 is switched, the other end of the second capacitance C2 is then tieed up
Hold and be connected with ground terminal G.
In some embodiments, such as Fig. 4 A institutes, the first~the 4th transistor switch Q41~Q44 can be respectively by the bipolar of NPN
Junction transistors switch (BJT) is formed altogether, therefore the control terminal of the first~the 4th transistor switch Q41~Q44, electric current input
End and current output terminal correspond to base stage, source electrode and emitter-base bandgap grading respectively.But in other embodiment, as Fig. 7 A, Fig. 7 B scheme institute
Showing, the first~the 4th transistor switch Q41~Q44 also can switch (FET) by field school transistor and be formed, therefore the first~the 4th
Control terminal, current input terminal and the current output terminal of transistor switch Q41~Q44 corresponds to gate, source electrode and drain respectively.
It is no longer superfluous in this since the framework of the polarity switching circuit 12 shown in Fig. 7 A, Fig. 7 B is similar to Fig. 4 A, Fig. 4 B to operation principles
State.
Referring to Fig. 8, it is applied to schematic diagram in terms of the implementation of a mechanism body for the piezo-activator shown in Fig. 4 A, such as
Shown in figure, which can be a fluid delivery system 8, but be not limited, and fluid delivery system 8 is applicable to medical life
The industry such as skill, computer technology, printing or the energy, can convey the pumping in gas or liquid, such as an ink-jet table printing machine,
Mechanical energy mainly is converted electric energy to via piezo-activator 9, wherein piezo-activator 9 includes braking plate 90 and the thin mould of vibration
91, and output AC voltage V1 and V2 are connected respectively, make braking plate 90 to the driving in response to output AC voltage V1 and V2
And the thin mould 91 of vibration produces perseveration, to cause the volume compression of pressure chamber 92 or expansion, makes fluid delivery system 8 can
Use the effect of reaching transmission fluid.
In conclusion the polarity switching circuit of the present invention is switched using the first~the 4th transistor and the first~the second filter
The connection of wave circuit and start export as the output AC voltage of smooth AC wave shape, thereby reduce power loss, and avoid
Piezo-activator produces noise in start, meanwhile, because the polarity switching circuit of the present invention only needs to utilize the first~the 4th electricity crystalline substance
Body is switched to form, therefore the production cost of the polarity switching circuit of the present invention can reduce, while can reduce polarity switching circuit
Because transistor switch is carrying out switching loss caused by or off switching.
Although the present invention can as person familiar with the technology appoint apply craftsman think and be it is all as modification, all do not depart from such as appended power
The protection domain that sharp claim is limited.
Claims (9)
1. a kind of polarity switching circuit, an output AC voltage is converted to by a DC high voltage, to drive a piezo-activator,
It is characterized in that, the polarity switching circuit includes：
One first switch circuit, receives one first pulse width modulation signal and one second pulse width modulation signal, wherein should
First pulse width modulation signal and the second pulse width modulation signal anti-phase conducting each other, and the one of the first switch circuit
End is connected with a ground terminal, and the other end connects the DC high voltage；
One second switch circuit, receives the first pulse width modulation signal and the second pulse width modulation signal, wherein should
First pulse width modulation signal and the second pulse width modulation signal anti-phase conducting each other, and the one of the second switch circuit
End is connected with the ground terminal, and the other end connects the DC high voltage；
One first filter circuit, is connected with the first switch circuit, a contact of the piezo-activator and the ground terminal；And
One second filter circuit, is connected with the second switch circuit, another contact of the piezo-activator and the ground terminal；
Wherein when the first pulse width modulation signal and the second pulse width modulation signal alternately carry out high levle and
During the switching of low level, promote the output AC voltage can produce smooth AC wave shape alternating voltage input it is piezoelectric actuated to this
Each contact of device；
The circuit that the first switch circuit is switched by one first transistor and one second transistor switch is combined is formed, this second
The circuit that on-off circuit is switched by one the 3rd transistor and one the 4th transistor switch is combined is formed；
First transistor is switched to the 4th transistor switch has a control terminal, a current input terminal, and an electricity respectively
Output terminal is flowed, wherein current input terminal of first transistor switch and the current output terminal of second transistor switch connects
Conducting is connect, and the current input terminal of the 3rd transistor switch is connected with the current output terminal that the 4th transistor switchs and leads
It is logical；The control terminal of first transistor switch receives the first pulse width modulation signal, and second transistor switch is somebody's turn to do
Control terminal receives the second pulse width modulation signal, and the control terminal of the 3rd transistor switch receives second pulse width
Modulation signal, the control terminal of the 4th transistor switch receive the first pulse width modulation signal.
2. polarity switching circuit as claimed in claim 1, it is characterised in that first filter circuit is by one first inductance and one
First capacitance is formed, which inputs with the contact of the piezo-activator, the electric current of first transistor switch
The contact of end and the current output terminal connection of second transistor switch, first capacitance and the piezo-activator, be somebody's turn to do
First inductance and ground terminal connection, second filter circuit are made of one second inductance and one second capacitance, second inductance
Current input terminal and the 4th transistor switch of another contact, the 3rd transistor switch with the piezo-activator
Current output terminal connection, another contact, second inductance and the ground terminal of second capacitance and the piezo-activator
Connection.
3. polarity switching circuit as claimed in claim 1, it is characterised in that first filter circuit is by one first capacitance institute structure
Into first capacitance and the contact of the piezo-activator, the current input terminal of first transistor switch, second electricity are brilliant
Current output terminal and ground terminal connection, second filter circuit of body switch are made of one second capacitance, this second
The current input terminal, the 4th transistor that another contact, the 3rd transistor of capacitance and the piezo-activator switch are opened
The current output terminal closed and ground terminal connection.
4. polarity switching circuit as claimed in claim 1, it is characterised in that first transistor is switched to the 4th transistor
Switch as bipolar junction transistors altogether.
5. polarity switching circuit as claimed in claim 4, it is characterised in that first transistor is switched to the 4th transistor
Switch as the bipolar junction transistors altogether of NPN.
6. polarity switching circuit as claimed in claim 1, it is characterised in that first transistor is switched to the 4th transistor
Switch as field effect electric crystal.
7. polarity switching circuit as claimed in claim 1, it is characterised in that the first pulse width modulation signal is carrying out height
During the switching of level and low level, which is low level, when the second pulse width modulation signal
When carrying out the switching of high levle and low level, which is low level.
8. polarity switching circuit as claimed in claim 1, it is characterised in that the first pulse width modulation signal with this second
Pulse width modulation signal is gradually decrease to low frequency by high frequency respectively and gradually rises tremendously high frequency again.
9. polarity switching circuit as claimed in claim 1, it is characterised in that the alternating voltage of the output smoothing AC wave shape in
Rise round and smooth waveform simultaneously in one first ratio value for linearly reaching a maximum voltage in a first time, the presentation that continues in half period
In reaching the maximum voltage in one first setting time, it is connected in one second time and maintains an equal level, the presentation that continues declines round and smooth waveform
And in one second ratio value that maximum voltage is reduced in one second setting time, continue and linearly drop to no-voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310281893.7A CN104283451B (en) | 2013-07-05 | 2013-07-05 | Polarity switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310281893.7A CN104283451B (en) | 2013-07-05 | 2013-07-05 | Polarity switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104283451A CN104283451A (en) | 2015-01-14 |
| CN104283451B true CN104283451B (en) | 2018-05-15 |
Family
ID=52258021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310281893.7A Active CN104283451B (en) | 2013-07-05 | 2013-07-05 | Polarity switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104283451B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107939658B (en) * | 2016-10-13 | 2019-11-05 | 研能科技股份有限公司 | The drive system of piezoelectric pump |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102938619A (en) * | 2011-08-15 | 2013-02-20 | 研能科技股份有限公司 | Polarity switching circuit |
| CN102957319A (en) * | 2011-08-29 | 2013-03-06 | 邱月美 | Power inverter pulse-width modulation control circuit and method |
-
2013
- 2013-07-05 CN CN201310281893.7A patent/CN104283451B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102938619A (en) * | 2011-08-15 | 2013-02-20 | 研能科技股份有限公司 | Polarity switching circuit |
| CN102957319A (en) * | 2011-08-29 | 2013-03-06 | 邱月美 | Power inverter pulse-width modulation control circuit and method |
Non-Patent Citations (1)
| Title |
|---|
| 数字功放H桥式输出电路的两类PWM比较;庄磊;《电声技术》;20041031(第10期);第26-27页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104283451A (en) | 2015-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101521459B (en) | Resonant switched capacitor direct current voltage converter | |
| CN104410252B (en) | Source electrode drive circuit and its control method | |
| CN204046407U (en) | A kind of many level IGBT drive circuit | |
| CN206363743U (en) | For half-bridge or the gate driver circuit and electronic system of full-bridge out drive stage | |
| CN102420541B (en) | Piezoelectric ceramic driving power supply and driving method | |
| CN2884287Y (en) | Circuit for starting current-source or valtage-source | |
| TW201308864A (en) | Polar switch circuit | |
| 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 | |
| CN107438941B (en) | Active pen, booster circuit and its control method | |
| CN105790575A (en) | Voltage conversion circuit and control method thereof | |
| CN104283451B (en) | Polarity switching circuit | |
| CN1719712A (en) | Power conversion apparatus | |
| CN101902144B (en) | Voltage converter and driving system applicable to the same | |
| CN104201881B (en) | Control circuit for step-down DCDC converter | |
| TWI334686B (en) | ||
| TWI342994B (en) | Voltage output device for an electronic system | |
| CN202872629U (en) | Switching power supply and constant voltage output controller thereof | |
| CN202424570U (en) | Inductance-capacitance (LC) resonant driving circuit for ultrasonic motor | |
| TWI484743B (en) | Boost circuit driven by low voltage and associated method | |
| CN211606870U (en) | Capacitive coupling type LED current-sharing circuit | |
| CN101106327A (en) | Multi-functional integrated DC converter | |
| CN107809177B (en) | A kind of adjustable driving circuit of isolated form output voltage | |
| TWI524649B (en) | Polar switch circuit | |
| CN102710121B (en) | Non-isolation type switching electric capacity adjuster for soft switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |