CN103427698A - Frequency changer circuit - Google Patents
Frequency changer circuit Download PDFInfo
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- CN103427698A CN103427698A CN201210147393XA CN201210147393A CN103427698A CN 103427698 A CN103427698 A CN 103427698A CN 201210147393X A CN201210147393X A CN 201210147393XA CN 201210147393 A CN201210147393 A CN 201210147393A CN 103427698 A CN103427698 A CN 103427698A
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Abstract
A frequency changer circuit comprises a voltage transformation module, a push-pull module and a switch tube Q1, wherein the voltage transformation module comprises a transformer with a primary winding and a secondary winding. One end of the primary winding of the transformer is connected with a direct current stabilized voltage power supply, and the other end of the primary winding of the transformer is connected with the input end of the switch tube Q1. The control end of the switch tube Q1 is connected with the output end of the push-pull module. The output end of the switch tube Q1 is connected with the ground. The push-pull module controls the switch tube Q1. In the frequency changer, the work of the frequency changer is controlled through on-off of the switch tube Q1, concretely, the push-pull module is used for controlling repeated on-off of the switch tube Q1, so that the secondary winding of the voltage transformation module is made to output voltage which is high in frequency and pure in wave shape.
Description
Technical field
The present invention relates to power supply frequency conversion field, particularly relate to a kind of frequency changer circuit.
Background technology
Electric energy is the power of current mankind development of civilization, is also an important indicator of national development of current measurement and people's lives.China's electrical energy production has ranked world's first with development, but still can not meet the demand that industrial development and people's lives improve, one of them main cause is exactly that the wasting phenomenon of electric energy is more serious, so the frequency variant speed regulating circuit electricity saving performance excellent with it more and more is subject to people's attention.Traditional Frequency-variable Modulation method exists the frequency conversion frequency to hang down and the unpurified shortcoming of waveform.
Summary of the invention
Based on this, be necessary to exist the frequency conversion frequency to hang down and the unpurified problem of waveform for traditional Frequency-variable Modulation method, provide a kind of the frequency changer circuit that the frequency conversion frequency is high, waveform is pure can be provided.
A kind of frequency changer circuit, comprise voltage changing module, recommend module and switching tube Q1, wherein,
Described voltage changing module comprises the transformer with armature winding and secondary winding, one end of the armature winding of described transformer is connected with D.C. regulated power supply, the other end of the armature winding of described voltage changing module is connected with the input of described switching tube Q1, the control end of described switching tube Q1 is connected with described output of recommending module, the output head grounding of described switching tube Q1, the described described switching tube Q1 of the module controls frequent switch of break-make repeatedly of recommending.
In embodiment, also comprise Anti-surging module, filtration module and rectification module therein, described rectification module comprises rectifier bridge, wherein,
Described Anti-surging module is connected between the live wire and zero line of AC power, the input of described filtration module is connected with described AC power, the input of described rectifier bridge is connected with the output of described filtration module, the anode output end ground connection of described rectifier bridge, the cathode end of described rectifier bridge is connected with the input of described voltage changing module.
Therein in embodiment, described Anti-surging module comprises piezo-resistance R2, piezo-resistance R3 and piezo-resistance R4, described piezo-resistance R2 mono-end is connected other end ground connection with the live wire of described AC power, described piezo-resistance R3 is connected between the live wire and zero line of described AC power, and described piezo-resistance R4 mono-end is connected other end ground connection with described zero line.
Therein in embodiment, described filtration module comprises filtering electromagnetic interference unit and filtering fluctuation interference units, the input of described filtering electromagnetic interference unit is connected with described AC power, the output of described filtering electromagnetic interference unit is connected with the input of described rectification module, and described filtering fluctuation interference units is in parallel with described filtering electromagnetic interference unit.
In embodiment, described filtering electromagnetic interference unit comprises the first inductance, the second inductance, the 3rd inductance and the 4th inductance therein, wherein,
The Same Name of Ends of described the first inductance is connected with described live wire, the Same Name of Ends of described the 3rd inductance is connected with the non-same polarity of described the first inductance, the non-same polarity of described the 3rd inductance is connected with an input of described rectifier bridge, the Same Name of Ends of described the second inductance is connected with described zero line, the Same Name of Ends of described the 4th inductance is connected with the non-same polarity of described the second inductance, and the non-same polarity of described the 4th inductance is connected with another input of described rectifier bridge.
In embodiment, described filtering fluctuation interference units comprises capacitor C 2, capacitor C 3 and capacitor C 4 therein, wherein,
The Same Name of Ends of one end of described capacitor C 2 and described the 3rd inductance connects, other end ground connection, one end of described capacitor C 3 connects with the Same Name of Ends of described the 3rd inductance, the other end is connected with the Same Name of Ends of described the 4th inductance, and described inductance C4 mono-end is connected with the Same Name of Ends of described the 4th inductance, other end ground connection.
Therein in embodiment, described filtration module also comprises capacitor C 5, capacitor C 6, one end of described capacitor C 5 connects with the Same Name of Ends of described the first inductance, the other end is connected with the Same Name of Ends of described the second inductance, and the two ends of described capacitor C 6 are connected with two inputs of described rectifier bridge respectively.
In embodiment, described rectification module also comprises filter capacitor C8 therein, and the end of described filter capacitor C8 is connected with the cathode end of described rectifier bridge, other end ground connection.
In embodiment, described voltage changing module also comprises absorbing circuit therein, and described absorbing circuit comprises resistance R 1, capacitor C 1 and diode D1, wherein,
The anode of described diode D1 is connected with the other end of described armature winding, and the negative electrode of described diode D1 is connected with an end of described armature winding by described capacitor C 1, and described resistance R 1 is in parallel with capacitor C 1.
In embodiment, the described module of recommending comprises switching tube Q2, switching tube Q3, resistance R 5 and resistance R 6 therein, wherein,
The input of described switching tube Q2 is connected with power supply, the control end of described switching tube Q2 connects the driving signal, the output of described switching tube Q2 is connected with the input of described switching tube Q3, the control end of described switching tube Q3 connects described driving signal, the output head grounding of described switching tube Q3, described resistance R 2 one ends are connected with the output of described switching tube Q2, and the other end of described resistance R 5 is connected with the control end of described switching tube Q1, simultaneously by described resistance R 6 ground connection.
In above-mentioned frequency changer circuit, be break-make by switching tube Q1 to control the work of frequency changer circuit, specifically by recommending module controls switching tube Q1 break-make repeatedly, make the voltage that the secondary winding of voltage changing module can output frequency be high, waveform is pure.
The accompanying drawing explanation
The structured flowchart that Fig. 1 is the frequency changer circuit in a preferred embodiment;
The circuit theory diagrams that Fig. 2 is the frequency changer circuit in a preferred embodiment.
Embodiment
As shown in Figure 1, be the frequency changer circuit of an embodiment, comprise voltage changing module 110, recommend module 120 and switching tube Q1.
In frequency changer circuit, be that break-make by switching tube Q1 is to control the work of frequency changer circuit, specifically by recommending module 120 control switch pipe Q1 break-make repeatedly, make primary winding current on transformer T1 in repeatedly changing frequently, in transformer T1 iron core (or magnetic core), just produce the induction magnetic flux, make in secondary coil to induce the voltage that output frequency is high, waveform is pure (or electric current).Switching tube Q1 repeatedly the frequency of break-make as between 30 ~ 300KHz.
As shown in Figure 2, in a preferred embodiment, voltage changing module 110 also comprises absorbing circuit 112, and absorbing circuit 112 comprises resistance R 1, capacitor C 1 and diode D1.
The other end of the armature winding of the anode of diode D1 and transformer T1, the end be not connected with the D.C. regulated power supply Vcc shown in Fig. 1 connects, the negative electrode of diode D1 is the end with armature winding by capacitor C 1, the end be connected with D.C. regulated power supply Vcc connects, and resistance R 1 is in parallel with capacitor C 1.Preferably, voltage changing module 110 also comprises resistance R 8, and resistance R 8 is connected between the negative electrode of resistance R 1 and diode D1.Be appreciated that the parameter that coordinates absorbing circuit 112 changes, resistance R 1 or resistance R 8 can omit or utilize several resistance connection in series-parallel to replace.
The surge current produced between reverse recovery when absorbing circuit 112 is mainly used in absorbing switching tube Q1 conducting, play the afterflow effect to transformer T1.
Recommend module 120 and comprise switching tube Q2, switching tube Q3, resistance R 5 and resistance R 6.
The input of switching tube Q2 is connected with power supply PFVcc, the control end of switching tube Q2 connects driving signal PFDR, the output of switching tube Q2 is connected with the input of switching tube Q3, the control end of switching tube Q3 connects driving signal PFDR, the output head grounding of switching tube Q3, resistance R 2 one ends are connected with the output of switching tube Q2, and the other end of resistance R 5 is connected with the control end of switching tube Q1, simultaneously by resistance R 6 ground connection.Preferably, recommend module 120 and also comprise resistance R 7, the output of resistance R 6, switching tube Q1 is by resistance R 7 ground connection.
Recommend module 120 and adopt two opposed polarities, bipolar transistor or field-effect transistor that power parameter is identical, be switching tube Q2 and switching tube Q3 is two opposed polarities, power parameter is identical bipolar transistor or field-effect transistor, with push pull mode, be present in circuit, each waveform of being responsible for positive-negative half-cycle amplifies task, during circuit working, the power switch pipe of two symmetries only has a conducting at every turn, so the little efficiency of conduction loss is high.In other embodiments, switching tube Q2 can also be two triode, metal-oxide-semiconductors that polarity is different with switching tube Q3.
In the present embodiment, the metal-oxide-semiconductor that switching tube Q1 is the N raceway groove, the grid that the control end of switching tube Q1 is metal-oxide-semiconductor, the drain electrode that the input of switching tube Q1 is metal-oxide-semiconductor, the source electrode that the output of switching tube Q1 is metal-oxide-semiconductor.
Recommend module 120 by the break-make of the push-pull current mode control switch pipe Q1 of itself, make the conducting of switching tube Q1 and turn off process more crisp, so, can be at the voltage that the secondary coil output frequency is high, waveform is pure of transformer T1.
In the present embodiment, frequency changer circuit also comprises Anti-surging module 130, filtration module 140 and rectification module 150, and rectification module 150 comprises rectifier bridge BR1.
Anti-surging module 130 is connected between the live wire and zero line of AC power, the input of filtration module 140 is connected with AC power, the input of rectifier bridge BR1 is connected with the output of filtration module 140, the anode output end ground connection of rectifier bridge BR1, the cathode end of rectifier bridge BR1 is connected with the input of voltage changing module 110.After the surge pulse voltage of AC power enters frequency changer circuit, Anti-surging module 130 realizes short-circuit protection in circuit front-end, and the surge voltage of releasing is avoided the infringement of surge pulse voltage to the back circuit.Thereafter, 140 pairs of AC power of filtration module carry out the filtering electromagnetic interference and voltage fluctuation is disturbed, for subsequent conditioning circuit provides pure voltage.Rectifier bridge BR1 carries out rectification and the exportable DC voltage-stabilizing electricity of filtering to the pure voltage of filtration module 140 outputs.
Anti-surging module 130 comprises piezo-resistance R2, piezo-resistance R3 and piezo-resistance R4, piezo-resistance R2 mono-end is connected other end ground connection with the live wire of AC power, piezo-resistance R3 is connected between the live wire and zero line of AC power, and piezo-resistance R4 mono-end is connected other end ground connection with zero line.After the surge pulse voltage of electrical network enters frequency changer circuit, the resistance of piezo-resistance R2, piezo-resistance R3 and piezo-resistance R4 sharply reduces, and in circuit front-end, realizes short-circuit protection, the surge voltage of releasing.
Filtration module 140 comprises filtering electromagnetic interference unit 142 and filtering fluctuation interference units 144, the input of filtering electromagnetic interference unit 142 is connected with AC power, the output of filtering electromagnetic interference unit 142 is connected with the input of rectification module 150, and filtering fluctuation interference units 144 is in parallel with filtering electromagnetic interference unit 142.
Filtering electromagnetic interference unit 142 comprises the first inductance L 1, the second inductance L 2, the 3rd inductance L 3 and the 4th inductance L 4.
The Same Name of Ends of the first inductance L 1 is connected with live wire, the Same Name of Ends of the 3rd inductance L 3 is connected with the non-same polarity of the first inductance L 1, the non-same polarity of the 3rd inductance L 3 is connected with the input of rectifier bridge BR1, the Same Name of Ends of the second inductance L 2 is connected with zero line, the Same Name of Ends of the 4th inductance L 4 is connected with the non-same polarity of the second inductance L 2, and the non-same polarity of the 4th inductance L 4 is connected with another input of rectifier bridge BR1.The first inductance L 1, the second inductance L 2, the 3rd inductance L 3 and the 4th inductance L 4 form common mode inductance, and in power circuit, common mode inductance filters the electromagnetic interference signal effect of common mode.
Filtering fluctuation interference units 144 comprises capacitor C 2, capacitor C 3 and capacitor C 4.
The Same Name of Ends of one end of capacitor C 2 and the 3rd inductance L 3 connects, other end ground connection, one end of capacitor C 3 connects with the Same Name of Ends of the 3rd inductance L 3, the other end is connected with the Same Name of Ends of the 4th inductance L 4, and inductance C4 mono-end is connected with the Same Name of Ends of the 4th inductance L 4, other end ground connection.
Preferably, filtration module 140 also comprises capacitor C 5, capacitor C 6, and an end of capacitor C 5 connects with the Same Name of Ends of the first inductance L 1, the other end is connected with the Same Name of Ends of the second inductance L 2, and the two ends of capacitor C 6 are connected with two inputs of rectifier bridge BR1 respectively.
AC supply voltage by filtering electromagnetic interference unit 142 after, high frequency and pulse interference signal filtering effectively, and fluctuating after interference units 144, capacitor C 5, capacitor C 6 and capacitor C 7 by filtering, can filtering high frequency and impulse disturbances.
Rectification module 150 also comprises filter capacitor C8, and the end of filter capacitor C8 is connected with the cathode end of rectifier bridge BR1, other end ground connection.Rectification module 150 provides D.C. regulated power supply Vcc for voltage changing module 110.
The operation principle of the frequency changer circuit of 2 explanations in preferred embodiments by reference to the accompanying drawings.
In frequency changer circuit, be that break-make by switching tube Q1 is to control the work of frequency changer circuit, specifically by recommending module 120 control switch pipe Q1 break-make repeatedly, make primary winding current on transformer T1 in repeatedly changing frequently, in transformer T1 iron core (or magnetic core), just produce the induction magnetic flux, make in secondary coil to induce the voltage that output frequency is high, waveform is pure (or electric current).Switching tube Q1 repeatedly the frequency of break-make as between 30 ~ 300KHz.
Further, the power supply of frequency changer circuit is to provide electric energy by civil power, the direct voltage of output 300V after front-end circuit rectification, filtering, after the primary coil of transformer T1, this direct voltage is added in switching tube Q1, be metal-oxide-semiconductor two interpolars, the metal-oxide-semiconductor two ends are the highest can bear 900V voltage, if the stabilization of power grids, this metal-oxide-semiconductor can not burn out, and metal-oxide-semiconductor has the voltage margin of 600V, frequency changer circuit can work.
Before adding piezo-resistance R1, piezo-resistance R2 and piezo-resistance R3, frequency changer circuit does not have lightning Protection Design, be struck by lightning, or with frequency changer circuit, be connected close on the medium and heavy equipment of circuit, big-block engine switch, electrical network is produced to violent pulse or violent impulse train, and the pulse edge electrical network enters input line live wire L, the zero line N of frequency changer circuit, and instantaneous high pressure can be up to several kilovolts, rectifier bridge BR1, metal-oxide-semiconductor Q1, resistance R 7 unrepairables in circuit are burnt out, frequency changer circuit can not be worked again.
After improvement; frequency changer circuit has increased Anti-surging module 130; that is: access respectively piezo-resistance R1, piezo-resistance R2 and piezo-resistance R3 between live wire L, zero line N and ground PE; after the surge pulse edge electrical network of electrical network enters frequency changer circuit, piezo-resistance R1, piezo-resistance R2 and piezo-resistance R3 resistance sharply reduce, and at the frequency changer circuit front end, realize short-circuit protection; the surge voltage of releasing; avoid the infringement of surge pulse to the back circuit, after the surge pulse has been released, the frequency changer circuit normal operation.Therefore, this circuit can absorb the huge energy of burst effectively, with the protection connection device, avoids impaired.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a frequency changer circuit, is characterized in that, comprise voltage changing module, recommend module and switching tube Q1, wherein,
Described voltage changing module comprises the transformer with armature winding and secondary winding, one end of the armature winding of described transformer is connected with D.C. regulated power supply, the other end of the armature winding of described voltage changing module is connected with the input of described switching tube Q1, the control end of described switching tube Q1 is connected with described output of recommending module, the output head grounding of described switching tube Q1, the described described switching tube Q1 of the module controls break-make repeatedly of recommending.
2. frequency changer circuit according to claim 1, is characterized in that, also comprises Anti-surging module, filtration module and rectification module, and described rectification module comprises rectifier bridge, wherein,
Described Anti-surging module is connected between the live wire and zero line of AC power, the input of described filtration module is connected with described AC power, the input of described rectifier bridge is connected with the output of described filtration module, the anode output end ground connection of described rectifier bridge, the cathode end of described rectifier bridge is connected with the input of described voltage changing module.
3. frequency changer circuit according to claim 2, it is characterized in that, described Anti-surging module comprises piezo-resistance R2, piezo-resistance R3 and piezo-resistance R4, described piezo-resistance R2 mono-end is connected other end ground connection with the live wire of described AC power, described piezo-resistance R3 is connected between the live wire and zero line of described AC power, and described piezo-resistance R4 mono-end is connected other end ground connection with described zero line.
4. frequency changer circuit according to claim 2, it is characterized in that, described filtration module comprises filtering electromagnetic interference unit and filtering fluctuation interference units, the input of described filtering electromagnetic interference unit is connected with described AC power, the output of described filtering electromagnetic interference unit is connected with the input of described rectification module, and described filtering fluctuation interference units is in parallel with described filtering electromagnetic interference unit.
5. frequency changer circuit according to claim 4, is characterized in that, described filtering electromagnetic interference unit comprises the first inductance, the second inductance, the 3rd inductance and the 4th inductance, wherein,
The Same Name of Ends of described the first inductance is connected with described live wire, the Same Name of Ends of described the 3rd inductance is connected with the non-same polarity of described the first inductance, the non-same polarity of described the 3rd inductance is connected with an input of described rectifier bridge, the Same Name of Ends of described the second inductance is connected with described zero line, the Same Name of Ends of described the 4th inductance is connected with the non-same polarity of described the second inductance, and the non-same polarity of described the 4th inductance is connected with another input of described rectifier bridge.
6. frequency changer circuit according to claim 5, is characterized in that, described filtering fluctuation interference units comprises capacitor C 2, capacitor C 3 and capacitor C 4, wherein,
The Same Name of Ends of one end of described capacitor C 2 and described the 3rd inductance connects, other end ground connection, one end of described capacitor C 3 connects with the Same Name of Ends of described the 3rd inductance, the other end is connected with the Same Name of Ends of described the 4th inductance, and described inductance C4 mono-end is connected with the Same Name of Ends of described the 4th inductance, other end ground connection.
7. according to the described frequency changer circuit of claim 5 or 6, it is characterized in that, described filtration module also comprises capacitor C 5, capacitor C 6, one end of described capacitor C 5 connects with the Same Name of Ends of described the first inductance, the other end is connected with the Same Name of Ends of described the second inductance, and the two ends of described capacitor C 6 are connected with two inputs of described rectifier bridge respectively.
8. according to claim 2,3 or 4 described frequency changer circuits, it is characterized in that, described rectification module also comprises filter capacitor C8, and the end of described filter capacitor C8 is connected with the cathode end of described rectifier bridge, other end ground connection.
9. frequency changer circuit according to claim 1, is characterized in that, described voltage changing module also comprises absorbing circuit, and described absorbing circuit comprises resistance R 1, capacitor C 1 and diode D1, wherein,
The anode of described diode D1 is connected with the other end of described armature winding, and the negative electrode of described diode D1 is connected with an end of described armature winding by described capacitor C 1, and described resistance R 1 is in parallel with capacitor C 1.
10. frequency changer circuit according to claim 1, is characterized in that, the described module of recommending comprises switching tube Q2, switching tube Q3, resistance R 5 and resistance R 6, wherein,
The input of described switching tube Q2 is connected with power supply, the control end of described switching tube Q2 connects the driving signal, the output of described switching tube Q2 is connected with the input of described switching tube Q3, the control end of described switching tube Q3 connects described driving signal, the output head grounding of described switching tube Q3, described resistance R 2 one ends are connected with the output of described switching tube Q2, and the other end of described resistance R 5 is connected with the control end of described switching tube Q1, simultaneously by described resistance R 6 ground connection.
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| CN201210147393XA CN103427698A (en) | 2012-05-14 | 2012-05-14 | Frequency changer circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107015082A (en) * | 2017-05-02 | 2017-08-04 | 国网山东省电力公司滨州供电公司 | A kind of Line Loss of Distribution Network System detection means |
| CN109510482A (en) * | 2018-12-19 | 2019-03-22 | 佛山市南海区昭裕照明有限公司 | A kind of Switching Power Supply of stable output |
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| CN202004671U (en) * | 2011-03-11 | 2011-10-05 | 上海南麟电子有限公司 | Primary-control constant-current constant-voltage convertor |
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| CN1437308A (en) * | 2002-02-08 | 2003-08-20 | 张法曾 | Integral switching power source with zero-ripple switching modulation rectification and off-line conversion |
| CN2854917Y (en) * | 2005-12-02 | 2007-01-03 | 天津市康力科技发展公司 | Device for reducing surge and higher harmonic |
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