CN102857128B - AC/DC change-over circuit - Google Patents
AC/DC change-over circuit Download PDFInfo
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- CN102857128B CN102857128B CN201110181107.7A CN201110181107A CN102857128B CN 102857128 B CN102857128 B CN 102857128B CN 201110181107 A CN201110181107 A CN 201110181107A CN 102857128 B CN102857128 B CN 102857128B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present invention relates to a kind of AC/DC change-over circuit, comprise rectification circuit and filter circuit, filter circuit comprises diode D3, diode D4, diode D8, diode D9, electric capacity C7 and electric capacity C9, diode D3 anode is connected with rectification circuit, diode D3 negative electrode is connected with diode D9 negative electrode, electric capacity C7 one end is connected with diode D3 negative electrode, the electric capacity C7 other end is connected with diode D8 anode and diode D4 negative electrode respectively, diode D8 negative electrode is connected with diode D9 anode, electric capacity C9 one end is connected with diode D4 anode, the electric capacity C9 other end is connected with diode D9 anode, diode D9 negative electrode is also connected with DC output end.The present invention uses that low-capacitance electric capacity carrys out alternative large capacitance electric capacity, cost is low and can improve power factor, avoids existing AC/DC change-over circuit and carries out AC/DC conversion, defect that higher, the whole circuit power factor of cost is lower owing to using large capacitance electric capacity.
Description
Technical field
The present invention relates to circuit design field, more particularly, relate to a kind of AC/DC change-over circuit using the electrochemical capacitor of low-capacitance to realize.
Background technology
General simple AC/DC change-over circuit is all use rectifier circuit, then by large electrochemical capacitor copped wave and capacitor filtering, namely achievable interchange is converted to direct current powering load.When using said method to carry out AC/DC conversion, require to use larger electrochemical capacitor, cost is higher, and the power factor of whole circuit is lower simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is, for the conversion of existing AC/DC change-over circuit owing to using larger electrochemical capacitor to carry out AC/DC, cost is higher, the defect that whole circuit power factor is lower, provides that a kind of to use the design of the electrochemical capacitor of low-capacitance to come alternative large electrochemical capacitor, cost low and can improve the AC/DC change-over circuit of power factor.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of AC/DC change-over circuit, comprising: for the rectification circuit carrying out rectification process to input AC electricity, and for carrying out the filter circuit of filtering process to the alternating current after described rectification process, described filter circuit comprises diode D3, diode D4, diode D8, diode D9, electric capacity C7 and electric capacity C9, the anode of described diode D3 is connected with described rectification circuit, the negative electrode of described diode D3 is connected with the negative electrode of described diode D9, one end of electric capacity C7 is connected with the negative electrode of described diode D3, the other end of described electric capacity C7 is connected with the anode of described diode D8 and the negative electrode of described diode D4 respectively, the negative electrode of described diode D8 is connected with the anode of described diode D9, one end of described electric capacity C9 is connected with the anode of described diode D4, the other end of described electric capacity C9 is connected with the anode of described diode D9, the negative electrode of described diode D9 is also connected with DC output end.
In AC/DC change-over circuit of the present invention, described electric capacity C9 is equal with the capacitance of described electric capacity C7.
In AC/DC change-over circuit of the present invention, when the voltage of the alternating current after described rectification process be greater than described electric capacity C7 and described electric capacity C9 voltage and time, alternating current after described rectification process charges to arriving described electric capacity C7 and described electric capacity C9 through described diode D3, described electric capacity C7, described diode D8 and described electric capacity C9 successively, and described diode D4 and described diode D9 ends.
In AC/DC change-over circuit of the present invention, when the voltage of the alternating current after described rectification process be less than or equal to described electric capacity C7 and described electric capacity C9 voltage and time, described diode D3 ends, the electric discharge of described DC output end is given by described electric capacity C7 and described electric capacity C9, described diode D8 ends, described diode D4 and described diode D9 conducting.
In AC/DC change-over circuit of the present invention, described AC/DC change-over circuit also comprises filter capacitor C10, and one end of described filter capacitor C10 is connected with described DC output end, the other end ground connection of described filter capacitor C10.
In AC/DC change-over circuit of the present invention, described AC/DC change-over circuit also comprises the light-emitting diode D1 of the operating state being used to indicate described AC/DC change-over circuit, the minus earth of described light-emitting diode D1, the anode of described light-emitting diode D1 is connected with described DC output end by resistance.
In AC/DC change-over circuit of the present invention; described AC/DC change-over circuit also comprises the voltage stabilizing didoe D2 for the protection of described light-emitting diode D1; the plus earth of described voltage stabilizing didoe D2, the negative electrode of described voltage stabilizing didoe D2 is connected with the anode of described DC output end and described light-emitting diode D1 respectively.
In AC/DC change-over circuit of the present invention, described rectification circuit is full-wave bridge rectifier circuit.
Implement AC/DC change-over circuit of the present invention, there is following beneficial effect: use low-capacitance electrochemical capacitor design carrys out alternative large electrochemical capacitor, cost is low and can improve power factor, avoid existing AC/DC change-over circuit and carry out the conversion of AC/DC, defect that higher, the whole circuit power factor of cost is lower owing to using larger electrochemical capacitor.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the electrical block diagram of the preferred embodiment of AC/DC change-over circuit of the present invention;
Fig. 2 is the voltage oscillogram of alternating current after the rectification process of the preferred embodiment of AC/DC change-over circuit of the present invention and the voltage oscillogram of DC output end;
Fig. 3 be the voltage when the alternating current after rectification process of the preferred embodiment of AC/DC change-over circuit of the present invention be greater than electric capacity C7 and electric capacity C9 voltage and time fundamental diagram;
Fig. 4 be the voltage when the alternating current after rectification process of the preferred embodiment of AC/DC change-over circuit of the present invention be less than or equal to electric capacity C7 and electric capacity C9 voltage and time fundamental diagram.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In the electrical block diagram of the preferred embodiment of the AC/DC change-over circuit of the present invention shown in Fig. 1, described AC/DC change-over circuit comprises rectification circuit 1 and filter circuit 2, rectification circuit 1 carries out rectification process for giving input AC electricity, filter circuit 2 is for carrying out filtering process to the alternating current after described rectification process, described filter circuit 2 comprises diode D3, diode D4, diode D8, diode D9, electric capacity C7 and electric capacity C9, the anode of described diode D3 is connected with the output of described rectification circuit 1, the negative electrode of described diode D3 is connected with the negative electrode of described diode D9, one end of electric capacity C7 is connected with the negative electrode of described diode D3, the other end of electric capacity C7 is connected with the anode of diode D8 and the negative electrode of diode D4 respectively, the negative electrode of diode D8 is connected with the anode of diode D9, one end of electric capacity C9 is connected with the anode of described diode D4, the other end of described electric capacity C9 is connected with the anode of described diode D9, the negative electrode of described diode D9 is also connected with DC output end.AC/DC change-over circuit of the present invention is by carrying out energy storage by electric capacity C7 and electric capacity C9 series connection during conversion, electric capacity C7 and electric capacity C9 is made to be the conversion that small capacitances can complete the original AC/DC using bulky capacitor to realize, what reduce AC/DC change-over circuit realizes cost, reduces the power factor of whole circuit simultaneously.
Below by Fig. 2 to Fig. 4, the operation principle of AC/DC change-over circuit of the present invention is made a concrete analysis of.The voltage oscillogram of the alternating current after over commutation process is as shown in the V+ in Fig. 2, as shown in Figure 3, when the voltage of the alternating current after rectification process be greater than electric capacity C7 and electric capacity C9 voltage and time, alternating current after rectification process charges to arriving electric capacity C7 and electric capacity C9 through diode D3, electric capacity C7, diode D8 and electric capacity C9 successively, and diode D4 and diode D9 ends.Here electric capacity C7 and electric capacity C9 uses the electric capacity of equal capacitance value, and these two electric capacity can be charged to (V
buck/ 2)=(V
acpeak value/2).The voltage of the alternating current after at this moment rectification process be less than or equal to electric capacity C7 and electric capacity C9 voltage and, namely V+ changes to and is less than or equal to (V
acpeak value/2), diode D3 ends, and V+ no longer powers to DC output end, and at this moment diode D8 ends, diode D4 and diode D9 conducting.As shown in Figure 4, discharged to DC output end by electric capacity C7, diode D4 and electric capacity C9, diode D9, namely by electric capacity C7 and electric capacity C9, load circuit is powered.At this moment DC output end (i.e. V
buck) change in voltage equally with V+ would not have crest and trough, but the crest of smooth change, play the effect (as shown in Figure 2) of waveform copped wave.Be less than or equal to (V when V+ changes to simultaneously
acpeak value/2), V+ does not power to DC output end, namely when change in voltage is trough, input current is also decreased to 0, so voltage and current change consistency is better than the general consistency with the circuit of electrochemical capacitor greatly, so the power supply input power factor of AC/DC change-over circuit of the present invention also can improve.
In the electrical block diagram of the preferred embodiment of the AC/DC change-over circuit of the present invention shown in Fig. 1, described AC/DC change-over circuit also comprises filter capacitor C10, one end of described filter capacitor C10 is connected with described DC output end, the other end ground connection of described filter capacitor C10.Voltage DC output end being exported by the filtering of filter capacitor C10 is more level and smooth, better meets the demand of user's direct current supply.
In the electrical block diagram of the preferred embodiment of the AC/DC change-over circuit of the present invention shown in Fig. 1, described AC/DC change-over circuit also comprises the light-emitting diode D1 of the operating state being used to indicate described AC/DC change-over circuit, the minus earth of described light-emitting diode D1, the anode of described light-emitting diode D1 is connected with described DC output end by resistance.Described AC/DC change-over circuit also comprises the voltage stabilizing didoe D2 for the protection of described light-emitting diode D1; the plus earth of described voltage stabilizing didoe D2, the negative electrode of described voltage stabilizing didoe D2 is connected with the anode of described DC output end and described light-emitting diode D1 respectively.When AC/DC change-over circuit of the present invention is powered to DC output end, at this moment light-emitting diode D1 can be lit to indicate this AC/DC change-over circuit in running order.Voltage stabilizing didoe D2 then can ensure that the operating voltage at light-emitting diode D1 two ends can not be excessive and damaged by light-emitting diode D1.
In the electrical block diagram of the preferred embodiment of the AC/DC change-over circuit of the present invention shown in Fig. 1, described rectification circuit 1 is full-wave bridge rectifier circuit.Full-wave bridge rectifier circuit simplicity of design is practical, can well meet the rectification demand of client.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing specification of the present invention and accompanying drawing content to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (3)
1. an AC/DC change-over circuit, is characterized in that, comprising:
For the rectification circuit (1) carrying out rectification process to input AC electricity; And
For carrying out the filter circuit (2) of filtering process to the alternating current after described rectification process,
Described filter circuit (2) comprises diode D3, diode D4, diode D8, diode D9, electric capacity C7 and electric capacity C9, the anode of described diode D3 is connected with the output of described rectification circuit (1), the negative electrode of described diode D3 is connected with the negative electrode of described diode D9, one end of electric capacity C7 is connected with the negative electrode of described diode D3, the other end of described electric capacity C7 is connected with the anode of described diode D8 and the negative electrode of described diode D4 respectively, the negative electrode of described diode D8 is connected with the anode of described diode D9, one end of described electric capacity C9 is connected with the anode of described diode D4, the other end of described electric capacity C9 is connected with the anode of described diode D9, the negative electrode of described diode D9 is also connected with DC output end,
Described electric capacity C9 is equal with the capacitance of described electric capacity C7;
When the voltage of the alternating current after described rectification process be greater than described electric capacity C7 and described electric capacity C9 voltage and time, alternating current after described rectification process charges to arriving described electric capacity C7 and described electric capacity C9 through described diode D3, described electric capacity C7, described diode D8 and described electric capacity C9 successively, and described diode D4 and described diode D9 ends;
When the voltage of the alternating current after described rectification process be less than or equal to described electric capacity C7 and described electric capacity C9 voltage and time, described diode D3 ends, the electric discharge of described DC output end is given by described electric capacity C7 and described electric capacity C9, and then make the voltage of described DC output end be the crest of smooth change, described diode D8 ends, described diode D4 and described diode D9 conducting;
Described AC/DC change-over circuit also comprises the light-emitting diode D1 of the operating state being used to indicate described AC/DC change-over circuit and the voltage stabilizing didoe D2 for the protection of described light-emitting diode D1, the minus earth of described light-emitting diode D1, the anode of described light-emitting diode D1 is connected with described DC output end by resistance; The plus earth of described voltage stabilizing didoe D2, the negative electrode of described voltage stabilizing didoe D2 is connected with the anode of described DC output end and described light-emitting diode D1 respectively.
2. AC/DC change-over circuit according to claim 1, is characterized in that, described AC/DC change-over circuit also comprises filter capacitor C10, and one end of described filter capacitor C10 is connected with described DC output end, the other end ground connection of described filter capacitor C10.
3. AC/DC change-over circuit according to claim 1, is characterized in that, described rectification circuit (1) is full-wave bridge rectifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110181107.7A CN102857128B (en) | 2011-06-30 | 2011-06-30 | AC/DC change-over circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110181107.7A CN102857128B (en) | 2011-06-30 | 2011-06-30 | AC/DC change-over circuit |
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| Publication Number | Publication Date |
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| CN102857128A CN102857128A (en) | 2013-01-02 |
| CN102857128B true CN102857128B (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110181107.7A Active CN102857128B (en) | 2011-06-30 | 2011-06-30 | AC/DC change-over circuit |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104103142A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Infrared monitor of perimeter protection alarm system of water point of environmental monitoring station |
| CN104103139A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Infrared monitor alarm circuit of perimeter protection alarm system of water point of environmental monitoring station |
| CN104103141A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Infrared sensing module of perimeter protection alarm system of water point of environmental monitoring station |
| CN104103143A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Perimeter protection alarm system of water point of environmental monitoring station |
| CN104103140A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Infrared monitor power supply circuit of perimeter protection alarm system of water point of environmental monitoring station |
| CN104979893A (en) * | 2015-07-06 | 2015-10-14 | 衢州市沃思电子技术有限公司 | Standby power supply of electronic equipment |
| CN107979274A (en) * | 2017-12-01 | 2018-05-01 | 海宁海微电子科技有限公司 | A kind of buffer switching circuit |
| CN109039036A (en) * | 2018-08-30 | 2018-12-18 | 维沃移动通信有限公司 | A kind of ac filter circuit, charger and mobile terminal |
| CN110098725A (en) * | 2019-06-19 | 2019-08-06 | 邢台子中电子科技有限公司 | A kind of DC power supply output rectification tube protective circuit and method |
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| CN201515527U (en) * | 2009-09-17 | 2010-06-23 | 鹤山丽得电子实业有限公司 | LED fluorescent lamp tube circuit |
| CN101931335A (en) * | 2009-06-19 | 2010-12-29 | 上海市晋元高级中学 | Circuit power supply system |
| CN201813587U (en) * | 2010-03-21 | 2011-04-27 | 姜俊旗 | Universal lighting LED driving circuit |
| CN102044958A (en) * | 2009-10-23 | 2011-05-04 | 台达电子工业股份有限公司 | Voltage reducing and boosting PFC (Power Factor Correction) circuit system with auxiliary circuit and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008125310A (en) * | 2006-11-15 | 2008-05-29 | Sakae Shibazaki | Switching power supply |
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Patent Citations (4)
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| CN101931335A (en) * | 2009-06-19 | 2010-12-29 | 上海市晋元高级中学 | Circuit power supply system |
| CN201515527U (en) * | 2009-09-17 | 2010-06-23 | 鹤山丽得电子实业有限公司 | LED fluorescent lamp tube circuit |
| CN102044958A (en) * | 2009-10-23 | 2011-05-04 | 台达电子工业股份有限公司 | Voltage reducing and boosting PFC (Power Factor Correction) circuit system with auxiliary circuit and method thereof |
| CN201813587U (en) * | 2010-03-21 | 2011-04-27 | 姜俊旗 | Universal lighting LED driving circuit |
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| CN102857128A (en) | 2013-01-02 |
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