CN102170231A - Piezoelectric-transformer-based power converter - Google Patents
Piezoelectric-transformer-based power converter Download PDFInfo
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- CN102170231A CN102170231A CN2011101027455A CN201110102745A CN102170231A CN 102170231 A CN102170231 A CN 102170231A CN 2011101027455 A CN2011101027455 A CN 2011101027455A CN 201110102745 A CN201110102745 A CN 201110102745A CN 102170231 A CN102170231 A CN 102170231A
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Abstract
The invention discloses a piezoelectric-transformer-based power converter, which sequentially comprises an input filter circuit (100), a drive circuit (200), a piezoelectric transformer (400), an output rectifier circuit (500) and an output filter circuit (600), wherein the drive circuit (200) comprises a control chip (IC1) and a chip peripheral circuit, and forms a voltage-controlled oscillation circuit; and the control chip (IC1) introduces a current resonance frequency signal of the piezoelectric transformer (400) by a feedback circuit (300) for realizing the automatic driving frequency tracking of the control chip (IC1). The piezoelectric-transformer-based power converter can automatic track the resonance frequency of the piezoelectric transformer, has relatively better frequency modulation characteristics, and is favorable for realizing product miniaturization because devices such as inductors and the like with relatively larger volumes are not required.
Description
Technical field
The present invention relates to power circuit, particularly, mainly the driving circuit section of piezoelectric transformer type supply convertor is improved based on the supply convertor of piezoelectric transformer.
Background technology
Piezoelectric transformer is an electronic transformer of new generation, and basic principle is at the primary side input voltage identical with the transformer resonance frequency, produces high pressure output at secondary side because of the conversion of piezoelectricity benefit.The energy storage that the power conversion of piezoelectric transformer source is all produced because of polarizing at piezoelectrics thickness direction and length direction for input voltage, thereby have electric energy input mechanical oscillation and effect of exporting at secondary side generation high pressure in piezoelectrics.Because have that through-put power density is big, simple in structure, antijamming capability is strong, be not afraid of advantage such as short circuit, piezoelectric transformer has wide development space in the electronic transformer field.
Piezoelectric transformer is as an electronic device of transmission of power at present, and early existing in the industry many researchers study its drive circuit in power rows.The drive signal of piezoelectric transformer must be an AC signal with the resonance frequency basically identical of piezoelectric transformer, so just can make piezoelectric transformer work.Owing to being influenced by outside environment for use temperature, load, internal temperature etc., the resonance frequency of piezoelectric transformer changes, therefore general requirement of the drive circuit of piezoelectric transformer followed the tracks of the resonance frequency of piezoelectric transformer, is operated in optimum state so that guarantee piezoelectric transformer.
But when piezoelectric transformer is operated in resonant frequency point always, its output voltage will significantly raise when load reduction, and its output voltage will descend significantly when load increases.For an open loop circuit, this does not wish to see.And the right half-wave that the drive signal operating frequency of piezoelectric transformer is arranged on resonance point is near near the resonance point, and the influence that above-mentioned load variations produced will be subjected to weakening to a certain degree.Because its output voltage was with the voltage input line variation when piezoelectric transformer was operated in resonance point; For an open loop circuit, this does not wish to see yet.Address these problems general employing closed-loop structure, when needing to isolate between input and output, then need further to cooperate photoelectrical coupler design, consequently increased cost and volume greatly.But for some micropower occasions, too high voltage stability is unnecessary.
In addition, piezoelectric transformer belongs to a kind of power delivery device of high-impedance state, its output voltage is subjected to the influence of load variations very big.In some occasions higher to the output voltage required precision, as the power delivery transformer, piezoelectric transformer scheme and existing magnetoelectricity transformer scheme still have some gaps on performance.But in some micropower converter occasions not high to the output voltage required precision, particularly more higher occasion to volume requirement, the piezoelectric transformer scheme is much better than the magnetoelectricity transformer scheme on cost, and is more or less the same with electromagnetic transformers on performance.The separated exciting circuit for driving piezoelectric transformer of general closed-loop structure is made up of devices such as control IC, power switch pipe, photoelectrical coupler, error amplifier, comparator, inductance and electric capacity.Obviously, the sort circuit complex structure is difficult to realize the product miniaturization.
Summary of the invention
In view of this, the object of the present invention is to provide the supply convertor based on piezoelectric transformer of a kind of low cost, miniaturization, stable performance, can have frequency modulation characteristic preferably from motion tracking piezoelectric transformer resonance frequency.
For solving above technical problem, technical scheme provided by the present invention is: a kind of supply convertor based on piezoelectric transformer, comprise an input filter circuit (100), one drive circuit (200), a piezoelectric sender (400), an output rectification circuit (500) and an output filter circuit (600) successively, comprise a control chip (IC1) and a chip periphery circuit in the described drive circuit (200), constitute a Voltage-Controlled oscillation circuit; Described control chip (IC1) is introduced the current resonant frequency signal of described piezoelectric transformer (400) through a feedback circuit (300), is used to realize that the driving frequency of described control chip (IC1) is from motion tracking.
More preferably, described control chip (IC1) is 555 IC chips.
More preferably, described chip periphery circuit comprises resistance (R1), resistance (R2) and electric capacity (C2), and wherein: voltage input anode is connected to voltage input negative terminal successively behind described resistance (R1), described resistance (R2) and described electric capacity (C2); Grounding leg (1) ground connection of described control chip (IC1); The common junction that triggers pin (2) and thresholding pin (6) is connected between described resistance (R2) and the described electric capacity (C2), output pin (3) is connected to first input electrode (A) of described piezoelectric transformer (400), the common junction of resetting pin (4) and supply voltage pin (8) is connected to voltage input anode, control voltage pin (5) is connected to the output of described feedback circuit (300), and discharge pin (7) is connected between described resistance (R1) and the described resistance (R2).
More preferably, described piezoelectric transformer (400) comprises first input electrode (A), second input electrode (B), first output electrode (C), second output electrode (D) and feedback electrode (E), and wherein: described first input electrode (A) is connected to the output pin (3) of described control chip (IC1); Described second input electrode (B) ground connection; Described first output electrode (C) is connected to an input of described output rectification circuit (500); Described second output electrode (D) is connected to another input of described output rectification circuit (500); Described feedback electrode (E) is connected to the input of described feedback circuit (300).
More preferably, described feedback circuit (300) comprises coupling resistance (R3), and described coupling resistance (R3) is connected between the control voltage pin (5) of the feedback electrode (E) of described piezoelectric transformer (4) and described control chip (IC1).
More preferably, described feedback circuit (300) comprises coupling capacitance, and described coupling capacitance is connected between the control voltage pin (5) of the feedback electrode (E) of described piezoelectric transformer (4) and described control chip (IC1).
More preferably, described feedback circuit (300) comprises diode (D1), resistance (R3), resistance (R4), resistance (R5), electric capacity (C3) and NPN triode (Q2), and wherein: the feedback electrode (E) of described piezoelectric transformer (400) is connected to the control voltage pin (5) of described control chip (IC1) successively behind the base stage of described diode (D1), described resistance (R4), described NPN triode (Q2), the collector electrode of described NPN triode (Q2), described resistance (R3); Described electric capacity (C3) and described resistance (R5) also connect the back and one are terminated between described diode (D1) and the described resistance (R4), the other end be connected to voltage input negative terminal, described NPN triode (Q2) emitter and three's common junction.
More preferably, described piezoelectric transformer (400) comprises first input electrode (A), second input electrode (B), first output electrode (C) and second output electrode (D), and wherein: described first input electrode (A) is connected to the output pin (3) of described control chip (IC1); Described second input electrode (B) is connected to the input of described feedback circuit (300); Described first output electrode (C) is connected to an input of described output rectification circuit (500); Described second output electrode (D) is connected to another input of described output rectification circuit (500).
More preferably, described feedback circuit (300) comprises diode (D1), diode (D6), resistance (R3), resistance (R4), resistance (R5), electric capacity (C3), NPN triode (Q2), and wherein: second input electrode (B) of described piezoelectric transformer (400) is connected to the control voltage pin (5) of described control chip (IC1) successively behind the base stage of described diode (D1), described resistance (R4), described NPN triode (Q2), the collector electrode of described NPN triode (Q2), described resistance (R3); Described electric capacity (C3) and described resistance (R5) also connect the back and one are terminated between described diode (D1) and the described resistance (R4), the other end be connected to voltage input negative terminal, described NPN triode (Q2), described NPN triode (Q2) emitter and three's common junction; The anode voltage input negative terminal of described diode (D6), negative electrode is connected to second input electrode (B) of described piezoelectric transformer (400).
More preferably, also comprise a LC resonance drive circuit (700), be connected between described drive circuit (200) and the described piezoelectric transformer (400), described LC resonance drive circuit (700) comprises inductance (L1) and metal-oxide-semiconductor (Q1), wherein: one of described inductance (L1) is terminated at first input electrode (A) of described piezoelectric transformer (400), and the other end is connected to second input electrode (B) of described piezoelectric transformer (400); The grid of described metal-oxide-semiconductor (Q1) connects the output pin (3) of described control chip (IC1), source ground, and drain electrode is connected to the resetting pin (4) of described control chip (IC1) behind described inductance (L1).
Compared with prior art, the great advantage that the present invention is based on the supply convertor technical scheme of piezoelectric transformer is: the mode that the circuit that drive circuit uses inductance and switching tube to form in can the abandoning tradition circuit drives, realize and use control chip instead; Thus, in the less occasion of required power output, can remove the bigger inductance component of volume, thereby realize miniaturization.Particularly, compare, the present invention includes but be not limited only to following advantage with existing piezoelectric transformer power delivery scheme:
1, drive circuit need not the components and parts of large volumes such as switching tube, inductance, thereby is easy to realize the small product size miniaturization;
2, the driving circuit structure statement of account, cost of manufacture is low;
3, realize pre-voltage stabilizing output characteristic, reduction is fluctuateed to output voltage influence because of the voltage input;
4, adopt input feedback electrode signal sampling, promoted product efficiency;
5, have the function of piezoelectric transformer operating frequency from motion tracking and calibration.
Description of drawings
Fig. 1 is the circuit principle structure block diagram that the present invention is based on the supply convertor of piezoelectric transformer;
Fig. 2 passes through the sampling of piezoelectric transformer feedback electrode, the RC first embodiment circuit diagram for the present invention;
Fig. 3 is for increasing the second embodiment circuit diagram of LC resonance drive circuit on the basis of Fig. 2;
Fig. 4 is the three embodiment circuit diagram of the present invention by the 5 pin level control IC output frequencies of the sampling of piezoelectric transformer feedback electrode, IC;
Fig. 5 is the four embodiment circuit diagram of the present invention by the 5 pin level control IC output frequencies of the sampling of piezoelectric transformer input power loop, IC.
Embodiment
Core of the present invention is that circuit for driving piezoelectric transformer adopts control chip (IC), its control voltage pin is introduced the current resonant frequency signal of piezoelectric transformer automatically by feedback, thereby realize the automatic following function of driving frequency, finish adjusting the piezoelectric transformer output voltage.
For the present invention, the driving frequency of the control chip right half-wave that always drops on the piezoelectric transformer frequency is near near the resonance point and settle out.Select control chip driving frequency point right one side of something, thereby can effectively realize utilizing 555 IC that its driving frequency is carried out among a small circle frequency adjustment at the piezoelectric transformer resonance point.When the voltage input was stablized, the control chip output signal frequency was controlled by the feedback frequency of piezoelectric transformer; When input changes, its variable will together influence the output signal frequency of control chip with the piezoelectric transformer feedback signal; Thus, realization is to the adjusting of output voltage.
In order to make those skilled in the art understand technical scheme of the present invention better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, be the functional block diagram of the micropower power supply converter (hereinafter to be referred as converter) that the present invention is based on piezoelectric transformer, wherein: the voltage input is exported through input filter circuit 100, drive circuit 200, piezoelectric transformer 400, output rectification circuit 500, output filter circuit 600 after successively; One feedback circuit 300 is arranged between drive circuit 200 and piezoelectric transformer 400; Drive circuit 200 constitutes Voltage-Controlled oscillation circuit by control chip and chip periphery circuit, and the control voltage pin of control chip is introduced the current resonant frequency signal of piezoelectric transformer 400 through feedback circuit 300, the driving frequency that realizes control chip thus is from motion tracking, finishes the adjustment of driving signal frequency and finishes adjusting to output voltage.
This converter circuit belongs to open loop structure as can be seen from Figure 1, because of need not large volume components and parts such as power switch pipe and inductance, thereby helps to realize the miniaturization of product, further specifies below in conjunction with the specific implementation circuit.
Embodiment one
Embodiment illustrated in fig. 2 one is the comparatively practical circuit diagram of the present invention, and input filter circuit 100 wherein, drive circuit 200, piezoelectric transformer 400, output rectification circuit 500, output filter circuit 600 circuit constitute specific as follows:
Described input filter circuit 100, C1 forms by filter capacitor, is connected voltage and imports positive and negative two ends.Certainly, input filter circuit 100 also can adopt other form, as LC filtering, RC filtering etc.
Described drive circuit 200 is the Voltage-Controlled oscillation circuit that resistance R 1, resistance R 2, capacitor C 2, control chip IC1 form, and voltage input anode is connected to voltage input negative terminal successively after resistance R 1, resistance R 2, capacitor C 2; The preferred 555 IC series of control chip IC1 control chip, grounding leg 1 (GROUND) ground connection of IC1, the common junction that triggers pin 2 (TRIGGER) and thresholding pin 6 (THRESHOLD) is connected between resistance R 2 and the capacitor C 2, output pin 3 (OUTPUT) is connected to the input electrode A of piezoelectric transformer 400, the common junction of resetting pin 4 (RESET) and supply voltage pin 8 (Vcc) is connected to voltage input anode, control voltage pin 5 (CONTROLVOLTAGE) are connected to the output of feedback circuit 3, and discharge pin 7 (DISCHARGE) is connected between resistance R 1 and the resistance R 2.This drive circuit 200 mainly constitutes the multi resonant Voltage-Controlled oscillation circuit that shakes by 555 IC control chip IC1.Originally, multi resonant shakes the output signal frequency of Voltage-Controlled oscillation circuit by the decision of the value of R1, R2, C2, its output signal frequency can be arranged on the slightly high frequency range of piezoelectric transformer 400 resonance frequencys generally speaking.The output signal frequency of final control chip IC1 will settle out than the higher frequency range of piezoelectric transformer 400 resonance frequencys.
Described feedback circuit 300 is to get frequency signal by the feedback electrode E from piezoelectric transformer 400 to finish FREQUENCY CONTROL through the control voltage pin 5 that a coupling resistance R3 is coupled to IC1 again.Generally speaking, piezoelectric transformer 400 can not directly insert measurement port as the port of sampled signal, mainly is because directly the harmonic signal of other frequency that is full of in piezoelectric transformer 400 output signals during coupling will have influence on system.The main effect of resistance R 3 has been RC effects, can certainly use electric capacity be coupled (among the figure no longer describe).Because piezoelectric transformer 400 itself has certain selecting frequency characteristic, thereby the output voltage frequency of its feedback port and resonance frequency basically identical own.The control voltage pin 5 that this feedback signal is met control chip IC1 can be realized carrying out inter-modulation mutually with the wave mode that discharges and recharges of C2, and through several all after dates, output pin 3 output frequencies of coremaking sheet IC1 are consistent with feedback port voltage waveforms frequency.And feedback electrode E has utilized this feature of piezoelectric transformer just, and the adaptive process by system makes the output voltage frequency of control chip IC1 remain at the place slightly higher than piezoelectric transformer resonance frequency.
Described piezoelectric transformer 400 is used for power delivery, its first input electrode A connects the output pin 3 of control chip IC1, the second input electrode B ground connection, feedback electrode E connects the input that feedback circuit 300, the first output electrode C and the second output electrode D are connected to output rectification circuit 500 respectively.Basic when consistent with its resonance frequency when input end signal, piezoelectric transformer 400 is converted into mechanical energy with the input electric energy, is converted into electric energy again after being transferred to output.
Described output rectification circuit 500 is known bridge rectifier, and it comprises four diode D2, D3, D4, D5, does not repeat them here.
Described output filter circuit 600 is the capacitor C 4 that is connected to voltage output end, also can adopt circuit structures such as LC filtering, RC filtering.
In this first embodiment, when piezoelectric transformer 400 work, from input feedback electrode E, get a signal; This frequency signal can be used to regulate an existing cheaply timing circuit, and it can be directly coupled to the input port of piezoelectric transformer 400, also can be by in the LC resonance drive circuit 700 among following second embodiment.The advantage that drives piezoelectricity transformation 400 by LC resonance drive circuit 700 is to have improved the piezoelectric transformer efficiency of transmission, and can reduce the phenomenon of other frequency of piezoelectric transformer wrong choice to a certain extent.
Embodiment two
Second embodiment shown in Figure 3 is for to have increased with LC resonance drive circuit 700 on the basis in first embodiment.This LC resonance drive circuit 700 is made up of inductance L 1, metal-oxide-semiconductor Q1; Inductance L 1 links to each other with two input electrode A, B of piezoelectric transformer 400; Metal-oxide-semiconductor Q1 grid connects the output pin 3 of control chip IC1, source ground, and drain electrode is connected to the resetting pin 4 of control chip IC1 after inductance L 1.
In first embodiment,, thereby generally be confined on the micropower transport module because the IC output port is irritated the limited in one's ability of electric current.And present embodiment has increased LC resonance drive circuit 700, can be so that circuit of the present invention develops toward the higher module of through-put power.
The course of work of described LC resonance drive circuit 700 is: when metal-oxide-semiconductor Q1 conducting, and inductance L 1 stored energy; When metal-oxide-semiconductor Q1 turn-offed, inductance L 1 released energy, and with the input end capacitor generation resonance of piezoelectric transformer 400.In general, the L1 value should make as far as possible that its resonance frequency is consistent with the resonance frequency of piezoelectric transformer.
Embodiment three
Embodiment illustrated in fig. 4 three for the feedback electrode by piezoelectric transformer 400 feeds back, the output frequency of the level control IC 1 of IC control voltage pin 5.The difference of present embodiment and embodiment one is that feedback circuit 300 adopts different circuit structures.
This feedback circuit 300 is made up of diode D1, resistance R 3, R4, R5, capacitor C 3, NPN triode Q2, and wherein: feedback electrode is connected to control chip IC1 control voltage pin 5 successively after diode D1, resistance R 4, NPN triode Q2 base stage, NPN triode Q2 collector electrode, resistance R 3; Capacitor C 3 and resistance R 5 also connect the back and one are terminated between diode D1 and the resistance R 4, and the other end is connected to voltage input negative terminal, NPN triode Q2 emitter and ground three's common junction.
By the operation principle of 555 IC chips as can be known, when triggering pin 2 voltages of control chip IC1 rise; The frequency of the drive signal of its output pin 3 outputs rises; When 2 pin voltages of control chip descended, the driving signal frequency of its output pin 3 outputs descended.Advantageously, when the driving signal frequency of Voltage-Controlled oscillation circuit output can satisfy the condition of negative feedback control during greater than resonance frequency, thereby can control regulated output voltage by negative feedback; And during piezoelectric transformer 400 work needed driving signal frequency must with its resonance frequency basically identical, for the shape that drives ripple basically without limits.Can reach 200mA because 555 control chip delivery outlets are irritated current capacity, thereby the direct drive pressure piezoelectric transformer of the signal of 555 control chip output pins, 3 outputs, realize that thus micropower transmits.
In the present embodiment, 3 output voltage signals of 555 control chip IC1 output pins of voltage-controlled drive circuit can connect and act on piezoelectric transformer 400.And sampling voltage can be from piezoelectric transformer 400 set feedback electrode E own, and the effect of its feedback voltage is to realize by the threshold voltage that changes 2 pin.As shown in Figure 2, when the feedback sample terminal voltage rises, after the acting in conjunction by D1, R4, R5, Q1, R3, the current value of shunting from control chip 5 pin will increase, and change 2 foot valve threshold voltages thereby play, and finally reach the purpose of frequency modulation.
Embodiment four
Fig. 5 embodiment four is for taking a sample by the input power loop, promptly directly from the input electrode B sampling of piezoelectric transformer, the level control IC output frequency of IC control voltage pin 5.The difference of itself and embodiment three is that feedback circuit 3 also comprises a diode D6 who is connected between piezoelectric transformer input electrode B and the voltage input negative terminal, the input power loop of sampling voltage during then from piezoelectric transformer 400 resonance.
Similarly, the LC resonance drive circuit 700 among the embodiment two also can be applicable among the circuit of following embodiment three, embodiment four, and the operation principle and the course of work are identical with embodiment two, do not repeat them here.
Except that several enforcement circuit of above-mentioned explanation, industry technical staff can associate naturally for example by above description and accompanying drawing other be equal to application scheme.It should be noted that the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.For those skilled in the art, under the prerequisite that does not break away from the principle of the invention, the present invention is carried out some improvement and modification, can use half-wave rectifying circuit, full-wave rectifying circuit, voltage doubling rectifing circuit etc. as output rectification circuit; Filter circuit can use LC filtering, the filtering of л type etc., all falls in the protection range of claim of the present invention.
Claims (10)
1. supply convertor based on piezoelectric transformer, comprise an input filter circuit (100), one drive circuit (200), a piezoelectric sender (400), an output rectification circuit (500) and an output filter circuit (600) successively, it is characterized in that, comprise a control chip (IC1) and a chip periphery circuit in the described drive circuit (200), constitute a Voltage-Controlled oscillation circuit; Described control chip (IC1) is introduced the current resonant frequency signal of described piezoelectric transformer (400) through a feedback circuit (300), is used to realize that the driving frequency of described control chip (IC1) is from motion tracking.
2. the supply convertor based on piezoelectric transformer according to claim 1 is characterized in that, described control chip (IC1) is 555 IC chips.
3. according to the described supply convertor of claim 2 based on piezoelectric transformer, it is characterized in that, described chip periphery circuit comprises resistance (R1), resistance (R2) and electric capacity (C2), and wherein: voltage input anode is connected to voltage input negative terminal successively behind described resistance (R1), described resistance (R2) and described electric capacity (C2); Grounding leg (1) ground connection of described control chip (IC1), the common junction that triggers pin (2) and thresholding pin (6) is connected between described resistance (R2) and the described electric capacity (C2), output pin (3) is connected to first input electrode (A) of described piezoelectric transformer (400), the common junction of resetting pin (4) and supply voltage pin (8) is connected to voltage input anode, control voltage pin (5) is connected to the output of described feedback circuit (300), and discharge pin (7) is connected between described resistance (R1) and the described resistance (R2).
4. the supply convertor based on piezoelectric transformer according to claim 3, it is characterized in that, described piezoelectric transformer (400) comprises first input electrode (A), second input electrode (B), first output electrode (C), second output electrode (D) and feedback electrode (E), and wherein: described first input electrode (A) is connected to the output pin (3) of described control chip (IC1); Described second input electrode (B) ground connection; Described first output electrode (C) is connected to an input of described output rectification circuit (500); Described second output electrode (D) is connected to another input of described output rectification circuit (500); Described feedback electrode (E) is connected to the input of described feedback circuit (300).
5. the supply convertor based on piezoelectric transformer according to claim 4, it is characterized in that, described feedback circuit (300) comprises coupling resistance (R3), and described coupling resistance (R3) is connected between the control voltage pin (5) of the feedback electrode (E) of described piezoelectric transformer (4) and described control chip (IC1).
6. the supply convertor based on piezoelectric transformer according to claim 4, it is characterized in that, described feedback circuit (300) comprises coupling capacitance, and described coupling capacitance is connected between the control voltage pin (5) of the feedback electrode (E) of described piezoelectric transformer (4) and described control chip (IC1).
7. the supply convertor based on piezoelectric transformer according to claim 4, it is characterized in that, described feedback circuit (300) comprises diode (D1), resistance (R3), resistance (R4), resistance (R5), electric capacity (C3) and NPN triode (Q2), and wherein: the feedback electrode (E) of described piezoelectric transformer (400) is connected to the control voltage pin (5) of described control chip (IC1) successively behind the base stage of described diode (D1), described resistance (R4), described NPN triode (Q2), the collector electrode of described NPN triode (Q2), described resistance (R3); Described electric capacity (C3) and described resistance (R5) also connect the back and one are terminated between described diode (D1) and the described resistance (R4), the other end be connected to voltage input negative terminal, described NPN triode (Q2) emitter and three's common junction.
8. the supply convertor based on piezoelectric transformer according to claim 3, it is characterized in that, described piezoelectric transformer (400) comprises first input electrode (A), second input electrode (B), first output electrode (C) and second output electrode (D), and wherein: described first input electrode (A) is connected to the output pin (3) of described control chip (IC1); Described second input electrode (B) is connected to the input of described feedback circuit (300); Described first output electrode (C) is connected to an input of described output rectification circuit (500); Described second output electrode (D) is connected to another input of described output rectification circuit (500).
9. the supply convertor based on piezoelectric transformer according to claim 8, it is characterized in that, described feedback circuit (300) comprises diode (D1), diode (D6), resistance (R3), resistance (R4), resistance (R5), electric capacity (C3), NPN triode (Q2), wherein: second input electrode (B) of described piezoelectric transformer (400) is successively through described diode (D1), described resistance (R4), the base stage of described NPN triode (Q2), the collector electrode of described NPN triode (Q2), be connected to the control voltage pin (5) of described control chip (IC1) behind the described resistance (R3); Described electric capacity (C3) and described resistance (R5) also connect the back and one are terminated between described diode (D1) and the described resistance (R4), the other end be connected to voltage input negative terminal, described NPN triode (Q2), described NPN triode (Q2) emitter and three's common junction; The anode voltage input negative terminal of described diode (D6), negative electrode is connected to second input electrode (B) of described piezoelectric transformer (400).
10. according to the described supply convertor of claim 4～9 based on piezoelectric transformer, it is characterized in that, also comprise a LC resonance drive circuit (700), be connected between described drive circuit (200) and the described piezoelectric transformer (400), described LC resonance drive circuit (700) comprises inductance (L1) and metal-oxide-semiconductor (Q1), wherein: one of described inductance (L1) is terminated at first input electrode (A) of described piezoelectric transformer (400), and the other end is connected to second input electrode (B) of described piezoelectric transformer (400); The grid of described metal-oxide-semiconductor (Q1) connects the output pin (3) of described control chip (IC1), source ground, and drain electrode is connected to the resetting pin (4) of described control chip (IC1) behind described inductance (L1).
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| WO2015109862A1 (en) * | 2014-01-21 | 2015-07-30 | 华为技术有限公司 | Power supply converter |
| CN106063100A (en) * | 2014-01-06 | 2016-10-26 | 皇家飞利浦有限公司 | Application of piezo technology to convert alternating current (AC) line power to isolated direct current (DC) power in high external magnetic fields |
| CN108352438A (en) * | 2015-11-12 | 2018-07-31 | 埃普科斯股份有限公司 | Control circuit and method for manipulating piezoelectric transformer |
| CN111555629A (en) * | 2020-05-14 | 2020-08-18 | 成都芯源系统有限公司 | Resonant converter and control circuit and control method thereof |
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| CN101777839A (en) * | 2009-01-08 | 2010-07-14 | 中国电子为华实业发展有限公司 | Switch power supply device applying piezoelectric transformer |
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| CN106063100A (en) * | 2014-01-06 | 2016-10-26 | 皇家飞利浦有限公司 | Application of piezo technology to convert alternating current (AC) line power to isolated direct current (DC) power in high external magnetic fields |
| CN106063100B (en) * | 2014-01-06 | 2019-06-25 | 皇家飞利浦有限公司 | For supplying the power supply and method of electric power in high external magnetic field |
| WO2015109862A1 (en) * | 2014-01-21 | 2015-07-30 | 华为技术有限公司 | Power supply converter |
| CN108352438A (en) * | 2015-11-12 | 2018-07-31 | 埃普科斯股份有限公司 | Control circuit and method for manipulating piezoelectric transformer |
| CN108352438B (en) * | 2015-11-12 | 2022-04-15 | 埃普科斯股份有限公司 | Control circuit and method for controlling a piezoelectric transformer |
| US11362259B2 (en) | 2015-11-12 | 2022-06-14 | Epcos Ag | Control circuit and method for controlling a piezoelectric transformer |
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Application publication date: 20110831 |