CN101777839A - Switch power supply device applying piezoelectric transformer - Google Patents

Switch power supply device applying piezoelectric transformer Download PDF

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Publication number
CN101777839A
CN101777839A CN200910076234A CN200910076234A CN101777839A CN 101777839 A CN101777839 A CN 101777839A CN 200910076234 A CN200910076234 A CN 200910076234A CN 200910076234 A CN200910076234 A CN 200910076234A CN 101777839 A CN101777839 A CN 101777839A
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China
Prior art keywords
circuit
described
piezoelectric transformer
wave
input
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CN200910076234A
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Chinese (zh)
Inventor
马生茂
都金龙
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中国电子为华实业发展有限公司
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Priority to CN200910076234A priority Critical patent/CN101777839A/en
Publication of CN101777839A publication Critical patent/CN101777839A/en

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Abstract

The invention relates to a switch power supply device applying a piezoelectric transformer, which comprises an input rectifier filter circuit, a switch circuit, a piezoelectric transformer input conversion circuit, a piezoelectric transformer, a rectifier filter output circuit, a voltage sampling comparison and amplification feedback circuit and a current sampling comparison and amplification feedback circuit, wherein the piezoelectric transformer input conversion circuit is connected between the switch circuit and the piezoelectric transformer to convert the output signal of the switch circuit into a sine-wave or quasi-sine-wave signal needed by the piezoelectric transformer, so the efficient conversion of the piezoelectric transformer is ensured. In addition to a voltage feedback control circuit, the switch power supply device also comprises a current feedback control circuit, the transmission power of the piezoelectric transformer is effectively controlled via adjusting the switching frequency of the switch circuit, the stability of output voltage is adjusted, and the safety of the switch power supply in the limit working modes of complete no load, short circuit, overload, overvoltage and the like is ensured.

Description

The switching power unit of applying piezoelectric transformer

Technical field

The present invention relates to field of switch power, relate in particular to a kind of switching power unit of applying piezoelectric transformer.

Background technology

Switching Power Supply is to adopt semiconductor device as switch, recently adjusts output voltage by the duty of control switch.Passed through the development of decades, Switching Power Supply mostly adopts the pulse width modulation (PWM of electromagnetic conversion at present, Pulse Width Modulation), pulse frequency modulated (PFM, Pulse FrequencyModulation) and three kinds of control modes of pulse duration frequency modulation(FM) (PWM-PFM), the control corresponding topological structure is very ripe.Wherein, pulse frequency modulated is that the conducting pulse duration is constant, by changing the mode that the switch operating frequency changes duty ratio.Above-mentioned electromagnetic conversion control mode has been brought stronger electromagnetic interference inevitably, and the copper material that while electromagnetic conversion transformer needs more and more faces bigger price pressure.

Fig. 1 is the Switching Power Supply theory diagram of prior art, wherein, input grid alternating current source is by filter rectifier etc., be converted into satisfactory Switching Power Supply direct-current input power supplying, switching circuit and transformer, it is the main channel of Switching Power Supply conversion, the power supply wave shape of finishing having power carries out chopping modulation, by rectifying and wave-filtering, the reliable and stable DC power supply that provides load to need is exported afterwards, and control circuit is taken a sample from output, through comparing with reference voltage, remove the control switch circuit then, change its frequency or pulsewidth, make output stable.

Piezoelectric transformer is to utilize the piezoelectric effect of the piezoelectrics after polarizing to realize voltage output as a kind of novel transformer.Importation at piezoelectric transformer drives with a sine voltage signal, make the importation produce vibration by inverse piezoelectric effect, vibration wave is coupled to output by the mechanical structure of input and output part, output produces electric charge by direct piezoelectric effect again, the quadratic transformation of the electromechanical energy of the electric energy-mechanical energy-electric energy of realization piezoelectrics obtains maximum output voltage under the resonance frequency of piezoelectric transformer.Compare with traditional electromagnetic transformers, the piezoelectric transformer volume is little, and is in light weight, noiseless, and no electromagnetic interference, step-up ratio is big, the conversion efficiency height, good output waveform need not magnetic core and copper cash, can save nonferrous materials; Piezoelectric transformer self can be with the complete filtering of the interference of power supply input stage as a good filter simultaneously, and the sine wave of a standard of output uses for back level load.

Applying piezoelectric transformer replaces traditional electromagnetic transformers to provide a good solution to the electromagnetic interference problem in the Switching Power Supply.

Summary of the invention

The invention provides a kind of switching power unit of applying piezoelectric transformer, solved the conversion of piezoelectric transformer input stage quasi-sine-wave, the problem of output sampling feedback pulse frequency modulated control, guaranteed the high-quality and safety and stability of power source conversion.

In order to solve the problems of the technologies described above, the invention provides a kind of switching power unit of applying piezoelectric transformer, comprising:

The input rectifying filter circuit;

Switching circuit is connected with described input rectifying filter circuit;

Piezoelectric transformer input change-over circuit is connected with described switching circuit, is used for the conversion of signals of switching circuit output is become the sine wave or the quasi-sine-wave signal of piezoelectric transformer needs;

Piezoelectric transformer is connected with described piezoelectric transformer input change-over circuit;

The rectifying and wave-filtering output circuit is connected with described piezoelectric transformer;

Voltage sample relatively amplifies feedback circuit, be connected with the rectifying and wave-filtering output circuit with described switching circuit, be used for the output sampled voltage signal from described rectifying and wave-filtering output circuit, feedback is input to described switching circuit after comparing, amplifying, and regulates the operating frequency of described switching circuit;

Current sample relatively amplifies feedback circuit, be connected with the rectifying and wave-filtering output circuit with described switching circuit, be used for the output sample rate current signal from described rectifying and wave-filtering output circuit, feedback is input to described switching circuit after comparing, amplifying, and regulates the operating frequency of described switching circuit.

The switching power unit of applying piezoelectric transformer of the present invention, by adopting piezoelectric transformer input change-over circuit, the conversion of signals of switching circuit output is become sine wave or quasi-sine-wave signal, input signal as piezoelectric transformer, realize the normal input requirement of piezoelectric transformer, for normal power transfer provides assurance; In addition, except adopting the voltage sample FEEDBACK CONTROL of output stage,, reach when input voltage variation and output loading variation the stability of output voltage is regulated by the switching frequency of by-pass cock circuit; Also adopt the current sample FEEDBACK CONTROL of output stage, guarantee the fail safe of Switching Power Supply under maximal work patterns such as zero load fully, short circuit, overload, overvoltage.

Description of drawings

Fig. 1 is the theory diagram of the Switching Power Supply of prior art;

Fig. 2 is the theory diagram of the Switching Power Supply of applying piezoelectric transformer of the present invention;

Fig. 3 is the circuit diagram of the switching circuit of one embodiment of the invention;

Fig. 4 is the circuit diagram of the piezoelectric transformer input change-over circuit of one embodiment of the invention;

Fig. 5 is the current sample feedback circuit of one embodiment of the invention and the circuit diagram of voltage sample feedback;

Fig. 6 is the circuit diagram of the current sample feedback circuit of another embodiment of the present invention;

The circuit diagram of the Switching Power Supply of the applying piezoelectric transformer of Fig. 7 one embodiment of the invention

Embodiment

Main thought of the present invention is to be applied in the Switching Power Supply with the traditional electromagnetic transformers of its replacement of piezoelectric transformer, as shown in Figure 2, in order to have guaranteed the effective conversion of piezoelectric transformer, between switching circuit and piezoelectric transformer, connect piezoelectric transformer input change-over circuit, be used for the output signal of switching circuit is converted to the sine wave or the quasi-sine-wave signal of piezoelectric transformer needs, simultaneously, except the Voltage Feedback control circuit, also comprise the Current Feedback Control circuit, switching frequency by the by-pass cock circuit, reach effective control, and the stability of output voltage is regulated and guaranteed that Switching Power Supply is in complete zero load the piezoelectric transformer through-put power, short circuit, overload, fail safe under the maximal work patterns such as overvoltage.

Below in conjunction with drawings and the embodiments technical solution of the present invention is described in further detail.

Fig. 4 is an embodiment of piezoelectric transformer input change-over circuit of the present invention, comprises first inductance 200 that is connected in parallel on piezoelectric transformer 300 inputs, and second inductance 201 and the electric capacity 202 that are connected on piezoelectric transformer 300 inputs.By electric capacity-inductance resonance, piezoelectric transformer input change-over circuit is converted to the quasi-sine-wave power signal with the square wave power signal of switching circuit 100 outputs, input signal as piezoelectric transformer 300, satisfy the normal input requirement of piezoelectric transformer, with the power consumption control on the piezoelectric transformer 300 in reasonable range, thereby the temperature rise of piezoelectric transformer 300 can be controlled preferably, guaranteed the effective conversion of piezoelectric transformer 300.

As shown in Figure 5, the 500th, an embodiment of current sample feedback circuit of the present invention, the 600th, an embodiment of voltage sample feedback circuit of the present invention.Output series resistance 501 at rectifying and wave-filtering output circuit 400, output sample rate current signal from rectifying and wave-filtering output circuit 400, on resistance 501, obtain the required voltage signal corresponding with described current signal, described voltage signal is sent into integrated operational amplifier 503, after integrated operational amplifier 503 and peripheral accessory circuit are handled by comparison, amplification etc., feedback signal is delivered to switching circuit 100.

As shown in Figure 3, switching circuit 100 comprises half bridge driver integrated circuit chip I R2153 110 and half-bridge switch circuit 120, IR2153 is VMOS (V-type groove metal oxide semiconductor field effect tube) and IGBT (igbt) gate drivers, the front end oscillator that it is similar to 555 time-base circuits with high voltage half-bridge gate drive circuit and one is integrated on one 8 pin chip, is stronger, the wieldy power drive IC chip of a function.The drive signal of half-bridge driver chip I R2153 110 outputs is sent into two MOSFET (metal oxide semiconductor field effect tube) 121 and 122 of half-bridge switch circuit 120, by the switch of control MOSFET 121 and 122, the input dc power signal is converted to the high frequency square wave power signal of Frequency Adjustable.Shown in Fig. 3 and 5, optical coupler 504 output terminals A and B are connected respectively to the A and the B of switching circuit 100, by the feedback signal of optical coupler 504 outputs is delivered to switching circuit 100, regulate the frequency of deciding of half-bridge driver chip I R2153 110, half-bridge driver chip I R2153 110 decide frequency by with its 2,3, the resistance 111 that 4 pins are connected, 112,113 and 114 and electric capacity 115 realize, resistance 111,112,113 and 114 series connection also are connected between pin two and 3, electric capacity 115 is connected between pin 3 and 4, pin 4 ground connection, the ends A of resistance 111 is connected with B with the output terminals A of optical coupler 504 respectively with B and the output terminals A of optical coupler 601 is connected with B.Wherein 2 of half-bridge driver chip I R2153 110,3,4 pins are respectively oscillator timing resistor input (Oscillator timing resistor input), oscillator timing capacitor input (Oscillator timing capacitor input) and chip ground (IC power and signalground).Because the voltage of feedback signal changes with the electric current of rectifying and wave-filtering output circuit 400 outputs, corresponding the changing of operating frequency meeting of half-bridge driver chip I R2153, thereby change the output signal frequency of half-bridge driver chip I R2153 110, and then the switching frequency of change MOSFET 121 and 122, the intake of control piezoelectric transformer reaches the effective control to the piezoelectric transformer through-put power.

As shown in Figure 6,500 ' be another embodiment of current sample feedback circuit of the present invention, input at rectifying and wave-filtering output circuit 400, that is to say the output of piezoelectric transformer 300, series current instrument transformer 501 ', input sample rate current signal from rectifying and wave-filtering output circuit 400, by current transformer 501 ' the obtain required voltage signal corresponding with described current signal, described voltage signal is sent into integrated operational amplifier 503, pass through relatively through integrated operational amplifier 503 and peripheral accessory circuit, amplification is delivered to switching circuit 100 with feedback signal after waiting and handling.

As shown in Figure 5 and Figure 6, in an embodiment of the present invention, further, at the output shunt regulator tube 502 of rectifying and wave-filtering output circuit 400, when output voltage was higher than set point, voltage-stabiliser tube 502 was breakdown, resistance 501 or current transformer 501 ' on electric current and voltage signal change, the feedback signal of respective change is sent to switching circuit 100, thereby changes the operating frequency of half-bridge driver chip I R2153 110, finally changes the switching frequency of MOSFET 121 and 122.

Fig. 7 is the embodiment of the Switching Power Supply of an applying piezoelectric transformer of the present invention, comprises input rectifying filter circuit, self-oscillation and half bridge driver integrated circuit IR2153 and peripheral circuit thereof, half-bridge switch circuit, rectifying and wave-filtering output circuit, current sample feedback circuit and voltage sample feedback circuit.When the output current of rectifying and wave-filtering output circuit during greater than set point, the electric current and the voltage signal that are connected on the resistance 501 of output of rectifying and wave-filtering output circuit can change; When the output voltage of rectifying and wave-filtering output circuit is higher than set point, voltage-stabiliser tube 502 is breakdown, the electric current and the voltage signal that are connected on the resistance 501 of output of rectifying and wave-filtering output circuit also can change, the feedback signal of respective change is sent to switching circuit 100, so just realized the current sample FEEDBACK CONTROL, the output variation has been carried out corresponding adjustment at control section, thereby can effectively prevent output overvoltage, overcurrent, these abnormal operating states of short circuit, guarantee the safety of using.

Need to prove; the above only is the preferable specific embodiment of the present invention; rather than to the qualification of technical solution of the present invention; anyly be familiar with those of ordinary skills of this technology in the suggested technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.

Claims (9)

1. the switching power unit of an applying piezoelectric transformer is characterized in that, comprising:
The input rectifying filter circuit;
Switching circuit is connected with described input rectifying filter circuit;
Piezoelectric transformer input change-over circuit is connected with described switching circuit, is used for the conversion of signals of switching circuit output is become the sine wave or the quasi-sine-wave signal of piezoelectric transformer needs;
Piezoelectric transformer is connected with described piezoelectric transformer input change-over circuit;
The rectifying and wave-filtering output circuit is connected with described piezoelectric transformer;
Voltage sample relatively amplifies feedback circuit, be connected with the rectifying and wave-filtering output circuit with described switching circuit, be used for the output sampled voltage signal from described rectifying and wave-filtering output circuit, feedback is input to described switching circuit after comparing, amplifying, and regulates the operating frequency of described switching circuit;
Current sample relatively amplifies feedback circuit, be connected with the rectifying and wave-filtering output circuit with described switching circuit, be used for the output sample rate current signal from described rectifying and wave-filtering output circuit, feedback is input to described switching circuit after comparing, amplifying, and regulates the operating frequency of described switching circuit.
2. switching power unit as claimed in claim 1, it is characterized in that: described piezoelectric transformer input change-over circuit comprises first inductance, second inductance and electric capacity, described first inductance is in parallel with the input of described piezoelectric transformer, described second inductance and capacitances in series, and connect with the input of described piezoelectricity transformation.
3. switching power unit as claimed in claim 1 is characterized in that, described current sample comparison feedback amplifier comprises:
Resistance is connected with the output of described rectifying and wave-filtering output circuit, is used for the output sample rate current signal from the rectifying and wave-filtering output circuit;
Operational amplifier and peripheral circuit thereof are connected with described resistance, are used for voltage signal corresponding with described current signal on the described resistance and reference voltage signal being compared and amplifying.
4. switching power unit as claimed in claim 1 is characterized in that, described current sample comparison feedback amplifier comprises:
Current transformer is connected with the input of described rectifying and wave-filtering output circuit, is used for the input sample rate current signal from the rectifying and wave-filtering output circuit;
Operational amplifier and peripheral circuit thereof are connected with described current transformer, are used for voltage signal corresponding with described current signal on the described current transformer and reference voltage signal being compared and amplifying.
5. as claim 3 or 4 described switching power units, it is characterized in that, described current sample comparison feedback amplifier also comprises: voltage stabilizing didoe, and in parallel with the output of described rectifying and wave-filtering output circuit, be used to limit the output voltage of described rectifying and wave-filtering output circuit.
6. switching power unit as claimed in claim 5, it is characterized in that, described current sample relatively amplifies feedback circuit and also comprises optical coupler, be connected with the output of described operational amplifier, the signal after being used for described operational amplifier relatively amplified is isolated the back through light and is fed back and be input to described switching circuit.
7. switching power unit as claimed in claim 1, it is characterized in that, described switching circuit comprises half-bridge drive circuit and half-bridge switch circuit, described half-bridge drive circuit is connected with the half-bridge switch circuit with described input rectifying filter circuit, and described half-bridge switch circuit is connected with described piezoelectric transformer input change-over circuit.
8. switching power unit as claimed in claim 7 is characterized in that, described half-bridge drive circuit adopts a self-oscillation half bridge driver integrated circuit chip I R2153.
9. switching power unit as claimed in claim 8, it is characterized in that, described half-bridge drive circuit also comprises the electric capacity that connects between the resistance that connects between the pin two of described self-oscillation half bridge driver integrated circuit chip I R2153 and the pin 3 and pin 3 and the pin 4, is used to realize the frequency of deciding of described self-oscillation half bridge driver integrated circuit chip I R2153.
CN200910076234A 2009-01-08 2009-01-08 Switch power supply device applying piezoelectric transformer CN101777839A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170231A (en) * 2011-04-22 2011-08-31 广州金升阳科技有限公司 Piezoelectric-transformer-based power converter
CN102361333A (en) * 2011-10-13 2012-02-22 江阴市威豪电器有限公司 Multipurpose standby power supply
CN102761254A (en) * 2011-04-28 2012-10-31 三美电机株式会社 Switched-mode power supply
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
TWI556078B (en) * 2015-02-13 2016-11-01 國立虎尾科技大學 Dynamic voltage restorer and transient voltage control mechanism thereof
CN108322060A (en) * 2017-12-29 2018-07-24 河南北瑞电子科技有限公司 A kind of digital program controlled AC power based on PWM controller

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170231A (en) * 2011-04-22 2011-08-31 广州金升阳科技有限公司 Piezoelectric-transformer-based power converter
CN102761254A (en) * 2011-04-28 2012-10-31 三美电机株式会社 Switched-mode power supply
CN102761254B (en) * 2011-04-28 2016-01-20 三美电机株式会社 Switching power unit
CN102361333A (en) * 2011-10-13 2012-02-22 江阴市威豪电器有限公司 Multipurpose standby power supply
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
TWI556078B (en) * 2015-02-13 2016-11-01 國立虎尾科技大學 Dynamic voltage restorer and transient voltage control mechanism thereof
CN108322060A (en) * 2017-12-29 2018-07-24 河南北瑞电子科技有限公司 A kind of digital program controlled AC power based on PWM controller

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Application publication date: 20100714