CN201234214Y - Piezoelectric transformer driving circuit - Google Patents

Piezoelectric transformer driving circuit Download PDF

Info

Publication number
CN201234214Y
CN201234214Y CNU2008201093747U CN200820109374U CN201234214Y CN 201234214 Y CN201234214 Y CN 201234214Y CN U2008201093747 U CNU2008201093747 U CN U2008201093747U CN 200820109374 U CN200820109374 U CN 200820109374U CN 201234214 Y CN201234214 Y CN 201234214Y
Authority
CN
China
Prior art keywords
piezoelectric transformer
metal oxide
oxide semiconductor
circuit
semiconductor transistor
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.)
Expired - Lifetime
Application number
CNU2008201093747U
Other languages
Chinese (zh)
Inventor
夏定豪
陈维忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CNU2008201093747U priority Critical patent/CN201234214Y/en
Application granted granted Critical
Publication of CN201234214Y publication Critical patent/CN201234214Y/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Abstract

The utility model provides a driving circuit for a piezoelectric transformer. The input terminal of the driving circuit is connected with a direct-current voltage, the output terminal of the driving circuit is connected with the input terminal of the piezoelectric transformer, the driving circuit is used for transforming the direct-current voltage into the intermittent half sinusoid voltage, the intermittent half sinusoid voltage is output to the piezoelectric transformer, the voltage output control method ensures that the operating frequency and the resonance frequency in the circuit meet a certain relationship by adjusting the parameters of all components in the driving circuit, and when the conduction time of a switching element meets specific conditions, the driving circuit outputs intermittent half sinusoid voltage, the driving circuit and the piezoelectric transformer respectively reach complete resonance state. The utility model reduces the loss of the switching element and can ensure that the entire circuit including the driving circuit and the piezoelectric transformer is in the complete resonance state so as to achieve the purposes of greatly reducing loss and enhancing reliability.

Description

A kind of circuit for driving piezoelectric transformer
Technical field
The utility model relates to transformer interlock circuit field, is specifically related to a kind of circuit for driving piezoelectric transformer.
Background technology
Piezoelectric transformer is a kind of electronic transformer device, and it utilizes piezoelectric effect, and the second energy transition form by electric energy-mechanical energy-electric energy reaches the transmission of energy.Compare with the traditional electrical magnetic type transformer, piezoelectric transformer has good characteristics such as little, in light weight, the no short circuit puncture of volume, progressively be used widely, as: high voltage source, anion generator, Xerox, alert with middle low power devices such as electric shock device, LCD backlight power supply, low-power laser pipe power supplys.
In the crystal that does not have symmetrical centre, because there is spontaneous polarization in inside, the positive and negative charge center does not overlap and produces dipole moment, and crystals just produces an electric field like this, is the balance internal electric field, plane of crystal just produces space charge, make whole crystal externally show electric neutrality, when external force changed, the dipole moment of crystals changed and makes internal electric field change, the space charge of plane of crystal is also just discharged like this, shows piezoelectricity.Otherwise under certain electric field action, crystal can produce the variation (being inverse piezoelectric effect) of overall dimension.
Piezoelectric transformer has utilized such principle just, as shown in Figure 1, on a piezoelectric transformer (can adopt piezoelectric ceramic piece), input a, b apply an electric field (driving voltage Vin) makes potsherd produce resonance (inverse piezoelectric effect), and change into electric charge output (piezoelectric effect Vout) at the mechanical vibrational energy that output c, d produce high strain, wherein resistance R L is load, for ease of understanding, can be divided into drive part 101 and power generation part 102 with pressing the power transformation depressor to regard as.
Because the driving voltage Vin of piezoelectric transformer is a sinusoidal waveform voltage in the prior art, so the structure of the drive circuit of most of piezoelectric transformer is a half-bridge circuit, as shown in Figure 2, this half-bridge circuit is by metal oxide semiconductor transistor MOS 1And MOS 2Constitute the working bus bar voltage V of the input of half-bridge circuit and direct current shown in Figure 3 1Connect, in this drive circuit, inductance L of series connection before the piezoelectric transformer of being everlasting 1Or LC series resonant circuit.By control MOS 1With input A 1And MOS 2The input terminal voltage A of pipe 2Waveform voltage, drive circuit is with this DC operation busbar voltage V 1Be shaped as sinusoidal voltage V shown in Figure 4 2, and be added to input a, the b of piezoelectric transformer 1.If consider the changing factor of ambient temperature, input voltage, load etc., drive circuit may be complicated a little, but also more practical, as shown in Figure 5, and at the input a of piezoelectric transformer 1 series capacitance C 1, at the input two ends of piezoelectric transformer 1 a, b shunt inductance L 2By inductance L 2And capacitor C 1The LC filter circuit that constitutes is used to remove clutter, and guarantees that piezoelectric transformer still has enough power outputs under the low extraneous input voltage of low temperature.
But no matter the drive circuit of piezoelectric transformer adopts the principle electrical circuit of figure (a), or adopts the practical circuit of figure (b), a common shortcoming is all arranged, i.e. metal oxide semiconductor transistor MOS 1, MOS 2Not the operating state that is in Zero-voltage zero-current, the working bus bar voltage V of its connection 1All the time be in the high direct voltage state, inductance adds that its equivalent Mathematical Modeling of piezoelectric transformer of series connection is generally inductive load, makes electric current with voltage phase difference be arranged again, so metal oxide semiconductor transistor MOS 1, MOS 2Switching loss very big.The drive circuit of above-mentioned piezoelectric transformer has just been applied mechanically the notion of common switching circuit, and practical circuit just adds LC filtering, thereby the shortcoming of switching circuit is eliminated circuit shortage specific aim here.
Piezoelectric transformer has developed into the pure resistance state that itself is equivalent in the prior art, and this piezoelectric transformer presents input voltage and input current same-phase (or differ be π) under a certain operating frequency.Owing to after above-mentioned drive circuit adds the piezoelectric transformer that has equivalent pure resistance state, can't constitute the notion of complex resonance circuit.Therefore must seek a kind of new drive circuit that can adapt to above-mentioned piezoelectric transformer characteristic requirement.
The utility model content
The purpose of this utility model provides a kind of circuit for driving piezoelectric transformer, this drive circuit is output as the batch (-type) half sine wave voltage, reduced the loss of switching device, can make the entire circuit that comprises drive circuit and piezoelectric transformer be in the complex resonance state, reach and reduce loss greatly, the purpose of raising reliability.
For achieving the above object, the utility model adopts following technical scheme:
A kind of circuit for driving piezoelectric transformer, described drive circuit comprises: the LC series resonant tank, input is connected with described direct voltage, and output is connected with piezoelectric transformer; Switch is connected in the two ends of electric capacity in the described LC series resonant tank in parallel; Switch control device is connected with described switch, is used to control the switch motion of described switch, makes the output output batch (-type) semisinusoidal waveform voltage of described LC series resonant tank.
Wherein, described switch is a metal oxide semiconductor transistor, the grid of described metal oxide semiconductor transistor is connected with described switch control device, source electrode is connected with described capacity earth one end, drain electrode is connected with the other end of electric capacity, and described switch control device is controlled the conducting of described metal oxide semiconductor transistor by waveform voltage and ended.
Wherein, the resonance frequency that inductance and electric capacity are determined in the described LC series resonant tank, greater than by the conducting of metal oxide semiconductor transistor with by the operating frequency of determining, the ON time of described metal oxide semiconductor transistor is less than half of the work period of being determined by described operating frequency.
Wherein, the described resonance frequency of determining by inductance and electric capacity in the LC series resonant tank, for by the conducting of metal oxide semiconductor transistor with by 1.4～1.6 times of the operating frequency of determining, the ON time of described metal oxide semiconductor transistor is 0.25～0.4 times of described work period.
Wherein, the described resonance frequency of determining by inductance and electric capacity in the LC series resonant tank, for by the conducting of metal oxide semiconductor transistor with by 1.5 times of the operating frequency of determining, the ON time of described metal oxide semiconductor transistor is 0.4 times of described work period.
Wherein, by the conducting of metal oxide semiconductor transistor and the resonance frequency when the operating frequency of determining equals piezoelectric transformer and reaches resonance condition.
Wherein, the capacitance of electric capacity is 32nf in the described LC series resonant tank, the inductance value of inductance is 84 μ H, and the ON time of described metal oxide semiconductor transistor is 6 μ s, and described is 15 μ s by the conducting of metal oxide semiconductor transistor with by the work period of determining.
The circuit for driving piezoelectric transformer and the output voltage control method that use the utility model to provide have following beneficial effect:
(1) when conducting of metal oxide semiconductor transistor metal-oxide-semiconductor or disconnection, the voltage that links to each other with metal-oxide-semiconductor is zero, so can reduce the switching loss of metal-oxide-semiconductor greatly;
(2) at piezoelectric transformer input voltage u cNon-vanishing preceding half period, its waveform is half sine wave, is applicable to the demand of piezoelectric transformer offset of sinusoidal driving voltage;
(3) at piezoelectric transformer input voltage u cBe zero back half period,, can rely on the elastic energy of storage because piezoelectric transformer is an elastomer, the sinusoidal attitude vibration of half period after finishing automatically, so the output of piezoelectric transformer is still a complete sinusoidal waveform;
(4) has equivalent pure resistance characteristic when piezoelectric transformer self, promptly under some operating frequencies, when its input voltage and input current same-phase (or phase difference is π), drive circuit works busbar voltage itself changes in the semisinusoidal mode, adjust its operating frequency like this, just can realize comprising drive circuit and piezoelectric transformer complex resonance characteristic, thereby improve the efficient of entire circuit greatly in interior entire circuit.
Description of drawings
Fig. 1 is the principle schematic of piezoelectric transformer;
Fig. 2 reaches and the piezoelectric transformer connection layout for existing conventional piezoelectric transformer drive circuit structure;
Fig. 3 is the input voltage schematic diagram of circuit for driving piezoelectric transformer;
Fig. 4 is the output voltage schematic diagram of circuit for driving piezoelectric transformer;
Fig. 5 is that practical circuit for driving piezoelectric transformer structure reaches and the piezoelectric transformer connection layout in the prior art;
Fig. 6 is that the utility model embodiment circuit for driving piezoelectric transformer structure reaches and the piezoelectric transformer connection layout;
Fig. 7 is that the preferred circuit for driving piezoelectric transformer structure of the utility model embodiment reaches and the piezoelectric transformer connection layout;
Fig. 8 is for when the LC series resonance frequency is close with operating frequency or consistent, and the piezoelectric transformer voltage waveform that drive circuit is exported when non-loaded;
Fig. 9 is for when the LC series resonance frequency is close with operating frequency or consistent, and the piezoelectric transformer voltage waveform that drive circuit is exported when load is arranged;
Figure 10 is the output voltage waveforms of drive circuit among the embodiment;
Figure 11 is the output voltage control method flow chart of the utility model piezoelectricity transformation drive circuit.
Among Fig. 1: 1, piezoelectric transformer; 101, drive part; 102, power generation part;
Embodiment
A kind of pressure power transformation depressor drive circuit that the utility model proposes is described as follows in conjunction with the accompanying drawings and embodiments.
Embodiment
Present embodiment circuit for driving piezoelectric transformer structure reaches and the piezoelectric transformer connection layout as shown in Figure 6, and this circuit comprises: LC series resonant tank, input and direct voltage V 1Connect, output is connected with piezoelectric transformer; Switching device is connected in the two ends of electric capacity in the LC series resonant tank in parallel; Switch control device is connected with switching device, is used for the switch motion of control switch device, makes the output output batch (-type) semisinusoidal waveform voltage of LC series resonant tank.
Be illustrated in figure 7 as preferred circuit for driving piezoelectric transformer structure and reach and the piezoelectric transformer connection layout, the LC series resonant tank is by the inductance L of mutual series connection 3And capacitor C 3Constitute, its switching device is metal oxide semiconductor transistor MOS 3, metal oxide semiconductor transistor MOS 3Grid be connected source electrode and capacitor C with switch control device 3Ground connection one end connects, drain electrode and capacitor C 3The other end connect, switch control device is by waveform voltage control metal oxide semiconductor transistor MOS 3Conducting and end.The input of LC series resonant tank connects DC bus-bar voltage u i, the input of piezoelectric transformer 1 also is connected in capacitor C in the LC resonant tank 3Two ends a1, b1, so piezoelectric transformer 1 is as the load of LC resonant tank.
By control metal oxide semiconductor transistor MOS 3The voltage of grid input can be realized metal oxide semiconductor transistor MOS 3Conducting with end, this conducting with by having determined MOS 3Operating frequency.Resonance frequency and metal oxide semiconductor transistor MOS when wherein LC series resonant tank 3Operating frequency when consistent, if piezoelectric transformer 1 non-loaded resistance R L (i.e. zero load), when drive circuit and piezoelectric transformer 1 were lossless again, the piezoelectric transformer input was the output (capacitor C of drive circuit 3Two ends) voltage u cVoltage waveform as shown in Figure 8, be specially a DC component and cosine wave sum.When piezoelectric transformer has load, when circuit is lossy, metal oxide semiconductor transistor MOS 3ON time must be arranged, and the waveform of piezoelectric transformer input as shown in Figure 9.Though because there is certain ON time in the sine voltage of above-mentioned drive circuit output, ON time is too short, and the LC series resonance frequency is close with operating frequency again, not ideal waveform therefore with the above-mentioned drive waveform piezoelectric transformer that has distorted.
In the present embodiment, by to the inductance L in the LC series resonant tank 3Inductance value and capacitor C 3Capacitance make adjustment, make the resonance frequency and the metal oxide semiconductor transistor MOS of LC series resonant tank 3The operating frequency of (being the parallel resonance frequency of transformer) is inconsistent, and the resonance frequency of LC series resonant tank is greater than MOS 3Operating frequency (being the parallel resonance frequency of piezoelectric transformer), MOS 3The ON time of pipe is less than half of the work period of being determined by operating frequency, and preferably the resonance frequency of LC resonant tank is MOS 31.4～1.6 times of operating frequency, MOS 3ON time when being again work period of 0.25～0.4 times, the voltage u at capacitor C two ends c(being the transformer input terminal voltage) just presents batch (-type) half-sine wave waveform as shown in figure 10, and in the preceding half period in each cycle, output voltage is approximately the half-sine wave shape, in the back half period, then is zero-voltage state.。
Because the resonance frequency f of LC series resonant tank and resonance period T are by the inductance L in the resonant tank 3And capacitor C 3Decision is specially:
β = 1 2 RC + R L 2 L - - - ( 1 )
ω 2 = ( 1 LC + R L RCL ) - β 2 - - - ( 2 )
T = 2 π ω
f = 1 T - - - ( 3 )
Wherein, R LBe inductance L 3Equivalent internal resistance, L is an inductance L 3Inductance value, C is a capacitor C 3Capacitance, wherein R is the load of drive circuit, is the equivalent load that piezoelectric transformer is seen into from input.
MOS 3Work period T 0For:
T 0＝T+τ 2+ε (4)
Wherein, T is the harmonic period of LC series resonant tank, τ 2Be MOS 3ON time, ε is off time, can be for just also can be for negative.
The resonance frequency f of preferred LC resonant tank is set to MOS in the present embodiment 31.5 times of operating frequency, i.e. T 0=1.5T, and τ 2=0.4T 0
During concrete enforcement, τ 2Determine according to the load of the drive circuit piezoelectric transformer of full load (promptly with), by adjusting τ 2Should make drive circuit head half period (or near half period) that comparatively regular semisinusoidal output is arranged, then half period is a straight no-voltage output substantially.Load is heavier, τ 2Bigger, load is lighter, τ 2Fewer, be plus or minus thereby ε may occur.
Drive circuit output voltage u in a half period cExpression formula as follows:
u c = u i [ 1 - e - βt cos ωt ] + u 1 · 2 π ( T 0 T - 1 - ϵ T ) e βt sin ωt - - - ( 8 )
Wherein, u iBe DC input voitage, T 0Be MOS 3The work period of (being the parallel resonance frequency of transformer) (seeing formula (4)), promptly be equivalent to the harmonic period of piezoelectric transformer, τ 2Be MOS 3ON time, T is the harmonic period of LC series resonant tank, ε is off time, R LBe inductance L 3Equivalent internal resistance, β is tried to achieve by formula (1), ω is tried to achieve by formula (2).
Drive circuit output voltage u in a half period in the following formula (8) cExpression formula can also adopt following formula to represent:
Figure Y200820109374D00104
Wherein,
Figure Y200820109374D00105
Wherein, u iBe DC input voitage, T 0Be MOS 3Work period (seeing formula (4)),, T is the harmonic period of LC series resonant tank, ε is off time, β is tried to achieve by formula (1), ω is tried to achieve by formula (2).
After above parameter by the LC series resonant circuit in the present embodiment is provided with, can make drive circuit output semisinusoidal waveform voltage, the benefit of doing like this is, as metal oxide semiconductor transistor MOS 3When pipe conducting or disconnection, with MOS 3The voltage that pipe links to each other is zero, so can reduce MOS greatly 3The switching loss of pipe; At piezoelectric transformer input voltage u cNon-vanishing preceding half period, its waveform is half sine wave, is applicable to the demand of piezoelectric transformer offset of sinusoidal driving voltage; At piezoelectric transformer input voltage u cBe zero back half period,, can rely on the elastic energy of storage because piezoelectric transformer is an elastomer, the sinusoidal attitude vibration of half period after finishing automatically, so the output of piezoelectric transformer is still a complete sinusoidal waveform.
In addition, when piezoelectric transformer self has equivalent pure resistance characteristic, promptly under some operating frequencies, when its input voltage and input current same-phase (or phase difference is π) (reaching resonance condition), drive circuit works busbar voltage itself changes in the semisinusoidal mode, adjust its operating frequency like this, just can realize comprising drive circuit and piezoelectric transformer complex resonance characteristic, thereby improved the efficient of entire circuit greatly in interior entire circuit.
Be as shown in figure 11, the output voltage control method flow chart of circuit for driving piezoelectric transformer, this control method comprises makes drive circuit output batch (-type) semisinusoidal waveform voltage, and further adjust parameter and make its operating state that reaches complex resonance reaching under the semisinusoidal waveform voltage condition, preceding a kind of method is promptly determined parameters relationship earlier: the resonance frequency of LC resonant tank is MOS 31.4～1.6 times of operating frequency, MOS 3ON time when being again work period of 0.25～0.4 times.A kind of method in back comprises step: obtain piezoelectric transformer and be in the required operating frequency of resonance condition on the basis of preceding a kind of method; By the relation of above-mentioned resonance frequency and operating frequency, the resonance frequency that the LC series resonant tank should reach when determining to reach the complex resonance state; Adjust inductance and capacitance parameter value in the LC series resonant tank, the resonance frequency of LC series resonant tank is adjusted the described resonance frequency that should reach, then according to drive circuit equivalent load size, be adjusted to the switching tube ON time, thereby make batch (-type) half sine wave voltage waveform reach comparatively perfectly stage, and reach above-mentioned piezoelectric transformer by the operating frequency that this switching tube ON time is determined and be in the required operating frequency of resonance condition.
In the present embodiment, the voltage of drive circuit input is 42.5V, and when reaching the complex resonance state, inductance and capacitance parameter value in the concrete LC series resonant tank that is provided with are:
L 3＝84μH，C 3＝32nf，T 0＝15μs，τ 2＝6μs
By above setting, the maximum of the batch (-type) half-wave sinusoidal voltage of drive circuit output: u Cmax≈ 126V.
The utility model not only is specially adapted to the drive circuit as piezoelectric transformer, equally also be applicable to as zero voltage switch circuit usefulness, or other needs the circuit of this type of waveform to use.
If the LC series resonance frequency is when being far longer than operating frequency (for example be operating frequency 10-1000 times time), in a work period, half-sine wave just becomes very narrow spike, its peak value can be that tens times of direct-current working volts are to more than the hundred times, form a series of belt lengths high frequency spike string intermittently, this pulse train can be used for the electric light source firing circuit and use.
Above execution mode only is used to illustrate the utility model; and be not to restriction of the present utility model; the those of ordinary skill in relevant technologies field; under the situation that does not break away from spirit and scope of the present utility model; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.

Claims (7)

1, a kind of circuit for driving piezoelectric transformer is characterized in that, described drive circuit comprises:
The LC series resonant tank, input is connected with described direct voltage, and output is connected with piezoelectric transformer;
Switch is connected in the two ends of electric capacity in the described LC series resonant tank in parallel;
Switch control device is connected with described switch, is used to control the switch motion of described switch, makes the output output batch (-type) semisinusoidal waveform voltage of described LC series resonant tank.
2, circuit for driving piezoelectric transformer as claimed in claim 1, it is characterized in that, described switch is a metal oxide semiconductor transistor, the grid of described metal oxide semiconductor transistor is connected with described switch control device, source electrode is connected with described capacity earth one end, drain electrode is connected with the other end of electric capacity, and described switch control device is controlled the conducting of described metal oxide semiconductor transistor by waveform voltage and ended.
3, circuit for driving piezoelectric transformer as claimed in claim 1, it is characterized in that, the resonance frequency that inductance and electric capacity are determined in the described LC series resonant tank, greater than by the conducting of metal oxide semiconductor transistor with by the operating frequency of determining, the ON time of described metal oxide semiconductor transistor is less than half of the work period of being determined by described operating frequency.
4, circuit for driving piezoelectric transformer as claimed in claim 3, it is characterized in that, the described resonance frequency of determining by inductance and electric capacity in the LC series resonant tank, for by the conducting of metal oxide semiconductor transistor with by 1.4～1.6 times of the operating frequency of determining, the ON time of described metal oxide semiconductor transistor is 0.25～0.4 times of described work period.
5, circuit for driving piezoelectric transformer as claimed in claim 4, it is characterized in that, the described resonance frequency of determining by inductance and electric capacity in the LC series resonant tank, for by the conducting of metal oxide semiconductor transistor with by 1.5 times of the operating frequency of determining, the ON time of described metal oxide semiconductor transistor is 0.4 times of described work period.
6, circuit for driving piezoelectric transformer as claimed in claim 5 is characterized in that, by the conducting of metal oxide semiconductor transistor and the resonance frequency when the operating frequency of determining equals piezoelectric transformer and reaches resonance condition.
7, circuit for driving piezoelectric transformer as claimed in claim 6, it is characterized in that, the capacitance of electric capacity is 32nf in the described LC series resonant tank, the inductance value of inductance is 84 μ H, the ON time of described metal oxide semiconductor transistor is 6 μ s, and described is 15 μ s by the conducting of metal oxide semiconductor transistor with by the work period of determining.
CNU2008201093747U 2008-07-22 2008-07-22 Piezoelectric transformer driving circuit Expired - Lifetime CN201234214Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2008201093747U CN201234214Y (en) 2008-07-22 2008-07-22 Piezoelectric transformer driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008201093747U CN201234214Y (en) 2008-07-22 2008-07-22 Piezoelectric transformer driving circuit

Publications (1)

Publication Number Publication Date
CN201234214Y true CN201234214Y (en) 2009-05-06

Family

ID=40620602

Family Applications (1)

Application Number Title Priority Date Filing Date
CNU2008201093747U Expired - Lifetime CN201234214Y (en) 2008-07-22 2008-07-22 Piezoelectric transformer driving circuit

Country Status (1)

Country Link
CN (1) CN201234214Y (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108566113A (en) * 2018-05-31 2018-09-21 深圳民盾安全技术开发有限公司 A kind of intelligent high pressure pulse control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108566113A (en) * 2018-05-31 2018-09-21 深圳民盾安全技术开发有限公司 A kind of intelligent high pressure pulse control device
CN108566113B (en) * 2018-05-31 2024-04-19 深圳民盾安全技术开发有限公司 Intelligent high-voltage pulse control device

Similar Documents

Publication Publication Date Title
CN100414808C (en) Piezoelectric energy trapping device capable of efficient trapping energy and energy-storaging
CN201134750Y (en) Single-stage LLC series resonance AC/DC converter
CN103475232B (en) High-precision bidirectional converter for electric energy storage and circulation
CN103607124B (en) A kind of electricity getting device based on non-closed current transformer and control method thereof
CN104682577A (en) Wireless power transmission equipment for supplying power to transmission line monitoring system and tuning method
CN106602579A (en) Wireless charging bidirectional energy transmission resonance compensating circuit and method
CN204442176U (en) A kind of switched inductors type accurate Z source DC-DC converter circuit
CN103944215A (en) Resonance type charging control system based on current feedback and control method thereof
Wang et al. A self-powered rectifier-less synchronized switch harvesting on inductor interface circuit for piezoelectric energy harvesting
CN104009633A (en) Current continuous type high-gain DC-DC converter circuit
CN110971015A (en) Ground and vehicle-mounted adjustable LCC (lower control limit) resonant wireless charging system
CN105939126A (en) Switch inductor type hybrid quasi-Z-source inverter
CN107465271B (en) Ultrasonic wireless power transmission power improving system based on resonance compensation network
CN110962635A (en) Three-level and adjustable LCC resonance wireless charging system
CN203562976U (en) Vehicle-mounted power supply circuit
CN201234214Y (en) Piezoelectric transformer driving circuit
CN101404462B (en) Piezoelectric transformer driving circuit and its output voltage control method
CN105322637A (en) Capacitor charging method and apparatus with constant power input characteristic
CN1274977A (en) Combined power filter with both active and passive parts
CN110212778A (en) A kind of non-contact single tube controlled resonant converter
CN203398993U (en) Full-bridge resonant transformation circuit of contactless power transmission
CN207426992U (en) A kind of Sofe Switch isolated inverter of quick response
CN101860230A (en) Novel AC-DC-AC converter and control method thereof
CN201048299Y (en) Highly effective pulse charger for accumulator
CN201204735Y (en) Drive device for electric discharge lamp

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20090506

Effective date of abandoning: 20080722