CN102857128A - AC (alternating-current) and DC (direct-current) conversion circuit - Google Patents
AC (alternating-current) and DC (direct-current) conversion circuit Download PDFInfo
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- CN102857128A CN102857128A CN2011101811077A CN201110181107A CN102857128A CN 102857128 A CN102857128 A CN 102857128A CN 2011101811077 A CN2011101811077 A CN 2011101811077A CN 201110181107 A CN201110181107 A CN 201110181107A CN 102857128 A CN102857128 A CN 102857128A
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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 invention relates to an AC (alternating-current) and DC (direct-current) conversion circuit which comprises a rectification circuit and a filter circuit, wherein the filter circuit comprises a diode D3, a diode D4, a diode D8, a diode D9, a capacitor C7 and a capacitor C9; the anode of the diode D3 is connected with a rectification circuit; the cathode of the diode D3 is connected with the cathode of the diode D9; one end of a capacitor C7 is connected with the cathode of the diode D3; the other end of the capacitor C7 is connected with the anode of the diode D8 and the cathode of the diode D4 respectively; the cathode of the diode D8 is connected with the anode of the diode D9; one end of the capacitor C9 is connected with the anode of the diode D4; the other end of the capacitor C9 is connected with the anode of the diode D9; and the cathode of the diode D9 is also connected with the DC output end. According to the invention, a small-capacity capacitor is used for replacing the high-capacity capacitor, the cost is low, and the power factor can be improved, and the defects that the existing AC and DC conversion circuit is high in cost, and is low in circuit power factors because the high-capacity capacitor is utilized are avoided.
Description
Technical field
The present invention relates to circuit design field, more particularly, relate to a kind of AC/DC change-over circuit that uses the electrochemical capacitor realization of low-capacitance.
Background technology
General simple AC/DC change-over circuit all is to use rectifier circuit, again by large electrochemical capacitor copped wave and capacitor filtering, namely achievable interchange is converted to the direct current powering load.When using said method to carry out the 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 existing AC/DC change-over circuit owing to using larger electrochemical capacitor to carry out the conversion of AC/DC, cost is higher, the defective that whole circuit power factor is lower provides a kind of electrochemical capacitor design with low-capacitance to substitute large electrochemical capacitor, the low AC/DC change-over circuit that also can improve power factor of cost.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of AC/DC change-over circuit, comprising: be used for carrying out the rectification circuit that rectification is processed to the input AC electricity; And be used for carrying out the filter circuit that filtering is processed to the alternating current after the described rectification processing, described filter circuit comprises diode D3, diode D4, diode D8, diode D9, capacitor C 7 and capacitor C 9, 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 capacitor C 7 is connected with the negative electrode of described diode D3, the other end of described capacitor C 7 respectively with the anode of described diode D8 be connected the negative electrode of diode D4 and be connected, the anodic bonding of the negative electrode of described diode D8 and described diode D9, one end of described capacitor C 9 and the anodic bonding of described diode D4, the anodic bonding of the other end of described capacitor C 9 and described diode D9, the negative electrode of described diode D9 also is connected with dc output end.
In AC/DC change-over circuit of the present invention, described capacitor C 9 equates with the capacitance of described capacitor C 7.
In AC/DC change-over circuit of the present invention, the voltage of the alternating current after described rectification is processed greater than the voltage of described capacitor C 7 and described capacitor C 9 and the time, alternating current after described rectification is processed is given described capacitor C 7 and 9 chargings of described capacitor C, described diode D4 and described diode D9 cut-off through described diode D3, described capacitor C 7, described diode D8 and described capacitor C 9 successively to ground.
In AC/DC change-over circuit of the present invention, the voltage of the alternating current after described rectification is processed less than or equal to the voltage of described capacitor C 7 and described capacitor C 9 and the time, described diode D3 cut-off, give described dc output end discharge by described capacitor C 7 and described capacitor C 9, described diode D8 cut-off, 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 the 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 that is 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 respectively with the anodic bonding of described dc output end and described light-emitting diode D1.
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, have following beneficial effect: the electrochemical capacitor design with low-capacitance substitutes large electrochemical capacitor, cost is low and can improve power factor, has avoided existing AC/DC change-over circuit owing to using larger electrochemical capacitor to carry out the lower defective of higher, the whole circuit power factor of conversion, cost of AC/DC.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the 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 the alternating current after the rectification of the preferred embodiment of AC/DC change-over circuit of the present invention is processed and the voltage oscillogram of dc output end;
Fig. 3 be AC/DC change-over circuit of the present invention preferred embodiment the alternating current after rectification is processed voltage greater than the voltage of capacitor C 7 and capacitor C 9 and the time fundamental diagram;
Fig. 4 be AC/DC change-over circuit of the present invention preferred embodiment the alternating current after rectification is processed voltage less than or equal to the voltage of capacitor C 7 and capacitor C 9 and the time fundamental diagram.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, 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, is not intended to limit the present invention.
In the electrical block diagram of the preferred embodiment of AC/DC change-over circuit of the present invention shown in Figure 1, described AC/DC change-over circuit comprises rectification circuit 1 and filter circuit 2, rectification circuit 1 is used for carrying out rectification to the input AC electricity to be processed, filter circuit 2 is used for carrying out filtering to the alternating current after the described rectification processing to be processed, described filter circuit 2 comprises diode D3, diode D4, diode D8, diode D9, capacitor C 7 and capacitor C 9, 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 capacitor C 7 is connected with the negative electrode of described diode D3, the other end of capacitor C 7 is connected negative electrode with the anode of diode D8 respectively and is connected with diode D4, the anodic bonding of the negative electrode of diode D8 and diode D9, one end of capacitor C 9 and the anodic bonding of described diode D4, the anodic bonding of the other end of described capacitor C 9 and described diode D9, the negative electrode of described diode D9 also is connected with dc output end.AC/DC change-over circuit of the present invention carries out energy storage by when conversion with capacitor C 7 and capacitor C 9 series connection, so that capacitor C 7 and capacitor C 9 can be finished the conversion of the AC/DC of the large electric capacity realization of original use for little electric capacity, reduce the realization cost of AC/DC change-over circuit, reduced simultaneously the power factor of whole circuit.
Below by Fig. 2 to Fig. 4 the operation principle of AC/DC change-over circuit of the present invention is done concrete analysis.The voltage oscillogram of the alternating current after over commutation is processed is shown in the V+ among Fig. 2, as shown in Figure 3, the voltage of the alternating current after rectification is processed greater than the voltage of capacitor C 7 and capacitor C 9 and the time, alternating current after rectification is processed is given capacitor C 7 and capacitor C 9 chargings, diode D4 and diode D9 cut-off through diode D3, capacitor C 7, diode D8 and capacitor C 9 successively to ground.Here capacitor C 7 and capacitor C 9 are used 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 is processed less than or equal to the voltage of capacitor C 7 and capacitor C 9 and, namely V+ changes to less than or equal to (V
AcPeak value/2), diode D3 cut-off, no longer to the dc output end power supply, at this moment diode D8 ends V+, diode D4 and diode D9 conducting.As shown in Figure 4, discharge to dc output end by capacitor C 7, diode D4 and capacitor C 9, diode D9, namely by capacitor C 7 and 9 pairs of load circuit power supplies of capacitor C.At this moment dc output end (is V
Buck) change in voltage just can equally with V+ not have crest and trough, but the crest of smooth change plays the effect (as shown in Figure 2) of waveform copped wave.Working as simultaneously V+ changes to less than or equal to (V
AcPeak value/2), V+ does not power to dc output end, namely when change in voltage is trough, input current also is decreased to 0, the consistency of the circuit of electrochemical capacitor is good greatly than general usefulness so voltage and current changes consistency, 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 AC/DC change-over circuit of the present invention shown in Figure 1, described AC/DC change-over circuit also comprises filter capacitor C10, the end of described filter capacitor C10 is connected with described dc output end, the other end ground connection of described filter capacitor C10.Filtering by filter capacitor C10 better meets the demand of user's direct current supply so that the voltage of dc output end output is more level and smooth.
In the electrical block diagram of the preferred embodiment of AC/DC change-over circuit of the present invention shown in Figure 1, described AC/DC change-over circuit also comprises the light-emitting diode D1 of the operating state that is 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 respectively with the anodic bonding of described dc output end and described light-emitting diode D1.When AC/DC change-over circuit of the present invention was 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.The operating voltage that voltage stabilizing didoe D2 then can guarantee light-emitting diode D1 two ends can be not excessive and light-emitting diode D1 is damaged.
In the electrical block diagram of the preferred embodiment of AC/DC change-over circuit of the present invention shown in Figure 1, described rectification circuit 1 is full-wave bridge rectifier circuit.The full-wave bridge rectifier circuit simplicity of design is practical, can well satisfy client's rectification demand.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to do, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (8)
1. an AC/DC change-over circuit is characterized in that, comprising:
Be used for carrying out the rectification circuit (1) that rectification is processed to the input AC electricity; And
Be used for carrying out the filter circuit (2) that filtering is processed to the alternating current after the described rectification processing,
Described filter circuit (2) comprises diode D3, diode D4, diode D8, diode D9, capacitor C 7 and capacitor C 9, 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 capacitor C 7 is connected with the negative electrode of described diode D3, the other end of described capacitor C 7 respectively with the anode of described diode D8 be connected the negative electrode of diode D4 and be connected, the anodic bonding of the negative electrode of described diode D8 and described diode D9, one end of described capacitor C 9 and the anodic bonding of described diode D4, the anodic bonding of the other end of described capacitor C 9 and described diode D9, the negative electrode of described diode D9 also is connected with dc output end.
2. AC/DC change-over circuit according to claim 1 is characterized in that, described capacitor C 9 equates with the capacitance of described capacitor C 7.
3. AC/DC change-over circuit according to claim 1, it is characterized in that, the voltage of the alternating current after described rectification is processed greater than the voltage of described capacitor C 7 and described capacitor C 9 and the time, alternating current after described rectification is processed is given described capacitor C 7 and 9 chargings of described capacitor C, described diode D4 and described diode D9 cut-off through described diode D3, described capacitor C 7, described diode D8 and described capacitor C 9 successively to ground.
4. AC/DC change-over circuit according to claim 1, it is characterized in that, the voltage of the alternating current after described rectification is processed less than or equal to the voltage of described capacitor C 7 and described capacitor C 9 and the time, described diode D3 cut-off, give described dc output end discharge by described capacitor C 7 and described capacitor C 9, described diode D8 cut-off, described diode D4 and described diode D9 conducting.
5. 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 the end of described filter capacitor C10 is connected with described dc output end, the other end ground connection of described filter capacitor C10.
6. AC/DC change-over circuit according to claim 1, it is characterized in that, described AC/DC change-over circuit also comprises the light-emitting diode D1 of the operating state that is 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.
7. AC/DC change-over circuit according to claim 6; it is characterized in that; 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 respectively with the anodic bonding of described dc output end and described light-emitting diode D1.
8. 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 |
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| 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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| CN102857128A true CN102857128A (en) | 2013-01-02 |
| CN102857128B CN102857128B (en) | 2015-10-28 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| 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 |
| 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 |
| 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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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| 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 |
| 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 |
| 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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| CN102857128B (en) | 2015-10-28 |
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