CN101873073A - AC to DC converter - Google Patents
AC to DC converter Download PDFInfo
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- CN101873073A CN101873073A CN200910135551A CN200910135551A CN101873073A CN 101873073 A CN101873073 A CN 101873073A CN 200910135551 A CN200910135551 A CN 200910135551A CN 200910135551 A CN200910135551 A CN 200910135551A CN 101873073 A CN101873073 A CN 101873073A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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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 to DC converter. The converter comprises an electromagnetic interference filter, a rectifier filter and a discharge circuit, wherein the electromagnetic interference filter receives commercial alternating current; the rectifier filter is coupled between the electromagnetic interference filter and the discharge circuit; the electromagnetic interference filter containing a safety regulation capacitor (or X capacitor) is connected across the live line and zero line of the commercial alternating current; and the discharge circuit contains a discharge resistor, and when detecting that the commercial alternating current is removed, the discharge resistor is controlled to discharge the residual charges on the X capacitor. When the commercial alternating current is not removed, the discharge resistor has no power loss; and as the designed resistance value of the discharge resistor does not need to be very large, the residual charges on the X capacitor can be fast discharged when the commercial alternating current is removed.
Description
Technical field
The present invention relates to a kind of AC to DC converter, and be particularly related to a kind of AC to DC converter of the X of having electric capacity.
Background technology
The electronic installation of all use AC mains, as LCD TV, generally need AC to DC converter with the input AC mains (its representative value converts high-level DC voltage to as 90～264Vrms), and (its representative value is as 380～400V), providing DC-DC converter to convert high-level DC voltage to different low-level DC voltage (its representative value such as 24V, 12V, 5V), be used for the electric supply of operating electronic devices so that provide.
Fig. 1 is a kind of circuit diagram of existing AC to DC converter.Please refer to Fig. 1, AC to DC converter 1 comprises electromagnetic interference (Electro Magnetic Interference is called for short EMI) filter 11, rectifier filter 12 and power factor corrector (Power Factor Corrector is called for short PFC) 13.AC to DC converter 1 receives AC mains AC from public electric wire net.AC mains AC generally transmits by three power lines, be that AC mains AC enters electronic installation by live wire (live wire) L transmission, leave electronic installation via zero line (neutral wire) N transmission again, also hindered by electric leakage to avoid electronic installation or personnel in addition by ground wire (earthwire) (not illustrating among the figure) being connected the earth.Electronic installation is coupled to serial connection fuse FU on the path of live wire L or zero line N at its front end usually, burns internal circuit to prevent thunderbolt or big electric current.
Electromagnetic interface filter 11 is in order to suppress importing electronic installation from the electromagnetic noise of public electric wire net into by power line, the electromagnetic noise that also prevents simultaneously electronic installation generation itself passes to public electric wire net by power line, and wherein electromagnetic noise can be divided into two kinds of differential mode (differential mode) noise and common mode (common mode) noises.Electromagnetic interface filter 11 comprises safety electric capacity (safety capacitor) CX and two common mode inductance LF1 and LF2.Safety capacitor C X cross-over connection is commonly referred to as X electric capacity between live wire L and zero line N, it is in order to the filtering differential mode noise.Two common mode inductance LF1 are the identical common mode choke coil of two flow directions (choke coils) with LF2, are respectively coupled between X capacitor C X two ends and the rectifier filter 12, and it is in order to the filtering common-mode noise.Electromagnetic interface filter 11 also comprises discharge resistance RX, and it is released the electric charge that remains on the X capacitor C X to prevent that personnel from getting an electric shock by loop P1 in order to when AC mains AC is removed.The resistance value of this discharge resistance RX is very big usually to avoid too many electric current to flow through from discharge resistance RX and cause too many power loss; Yet the resistance value of this discharge resistance RX is big more, will cause when AC mains AC is removed, and the speed that remains in the charge discharging resisting on the X capacitor C X is slow more.
According to IEC 60065 safety regulations, when AC mains AC was removed, the voltage that remains on the X capacitor C X must be less than 60V at 2 seconds interior.Because the demand of EMI filtering, the capacitance of X capacitor C X be usually about 0.5uF～2uF, and if the safety regulation of X electric capacity residual voltage will meet IEC 60065 and be removed the time for AC mains, then the resistance value of discharge resistance RX is about 1M Ω～250K Ω.Therefore, the voltage 230Vrms that advises AC mains AC with Europe is an example, and when AC mains AC was not removed, this discharge resistance RX had power loss and is about 53mW～210mW.Power loss must be less than still unlikely formation problem for the electronic installation of 1W or 500mW under standby mode (stand-by mode) for requiring usually at present for this.Yet, along with more and more higher energy cost and global warming issue, power loss during for standby requires more and more stricter, as the standby power loss must less than 300mW or even must be less than the requirement of 150mW, the discharge resistance RX of existing AC to DC converter 1 design is applied and is used.
Summary of the invention
Purpose of the present invention is exactly to propose a kind of AC to DC converter with X electric capacity that uses power factor corrector, its discharge resistance when AC mains is not removed does not have power loss, and can release apace when AC mains is removed and residue in electric charge on the X electric capacity.
Another object of the present invention is exactly to propose a kind of AC to DC converter with X electric capacity that does not use power factor corrector, its discharge resistance when AC mains is not removed does not have power loss, and can release apace when AC mains is removed and residue in electric charge on the X electric capacity.
In order to reach above-mentioned purpose and other purpose, the present invention proposes a kind of AC to DC converter with X electric capacity that uses power factor corrector, and it comprises Electromagnetic interference filter, rectifier filter, power factor corrector and discharge circuit.Electromagnetic interference filter is coupled to AC mains.Electromagnetic interference filter comprises that cross-over connection is in the live wire of AC mains and the safety electric capacity between the zero line (it generally is called X electric capacity).Rectifier filter has first end, second end, the 3rd end and the 4th end, rectifier filter second end is coupled to reference potential, rectifier filter the 3rd end and the 4th end are coupled to safety electric capacity two ends respectively, and rectifier filter is converted to direct voltage with AC mains and exports by rectifier filter first end.Power factor corrector is coupled to rectifier filter first end and reference potential, in order to adjust the current waveform and the output dc voltage of AC mains input.Discharge circuit comprises discharge switch, discharge resistance and testing circuit, discharge switch and discharge resistance coupled in series and cross-over connection are between rectifier filter first end and reference potential, and testing circuit is coupled to rectifier filter the 3rd end or the 4th end so that output detection signal control discharge switch conducting when detecting AC mains and be removed.
In order to reach above-mentioned purpose and other purpose, the present invention proposes a kind of AC to DC converter with X electric capacity that does not use power factor corrector in addition, and it comprises Electromagnetic interference filter, rectifier filter and discharge circuit.Electromagnetic interference filter is coupled to AC mains, and Electromagnetic interference filter comprises that the cross-over connection of safety electric capacity is between the live wire and zero line of AC mains.Rectifier filter, have first end, second end, the 3rd end and the 4th end, rectifier filter second end is coupled to reference potential, rectifier filter the 3rd end and the 4th end are coupled to safety electric capacity two ends respectively, and rectifier filter is converted to direct voltage with AC mains and exports by rectifier filter first end.Discharge circuit, comprise first rectifier diode, second rectifier diode, discharge switch, discharge resistance and testing circuit, the first rectifier diode anode tap is coupled to rectifier filter the 3rd end, the second rectifier diode anode tap is coupled to rectifier filter the 4th end, the first rectifier diode cathode terminal is coupled to the second rectifier diode cathode terminal, discharge switch and discharge resistance coupled in series and cross-over connection are between the first rectifier diode cathode terminal and reference potential, and testing circuit is coupled to rectifier filter the 3rd end or the 4th end so that output detection signal control discharge switch conducting when detecting AC mains and be removed.
Beneficial effect of the present invention is: the present invention just controls discharge resistance and is able to the charge discharging resisting that will remain on the X electric capacity when detecting AC mains and be removed, and therefore discharge resistance does not have power loss when AC mains is not removed; Moreover the resistance value of discharge resistance of the present invention does not need design very big, remains in electric charge on the X electric capacity so can release apace when AC mains is removed.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is a kind of circuit diagram of existing AC to DC converter;
Fig. 2 A and Fig. 2 B are the circuit diagram according to the AC to DC converter with X electric capacity of the use power factor corrector of one embodiment of the invention;
Fig. 3 is the circuit diagram that detects driver shown in Fig. 2 A;
Fig. 4 A and Fig. 4 B are the circuit diagram according to the AC to DC converter with X electric capacity that does not use power factor corrector of another embodiment of the present invention.
1,2, the 4-AC to DC converter description of reference numerals:; 11,21,41-electromagnetic interference (EMI) filter; The RX-discharge resistance; CX-safety electric capacity (or X electric capacity); LF1, LF2-common mode inductance; 12,22,42-rectifier filter; 221,421-rectifier filter first end; 222,422-rectifier filter second end; 223,423-rectifier filter the 3rd end; 224,424-rectifier filter the 4th end; DB1-first diode; DB2-second diode; DB3-the 3rd diode; DB4-the 4th diode; The CB-filter capacitor; 13,23-power factor corrector (PFC); The UPFC-PFC driver; The QPFC-power switch; The LPFC-inductance; The DPFC-diode; CPFC-electric capacity; 24,44-discharge circuit; CS-detects electric capacity; UDET-detects driver; The DD-rectifier diode; RD1-first resistance; RD2-second resistance; The A-common joint; The CD-filter capacitor; The QDET-driving switch; RD, RDIS-current-limiting resistance; DR1-first rectifier diode; DR2-second rectifier diode; The VCC-direct voltage; The QDIS-discharge switch; The RDIS-discharge resistance; The AC-AC mains; The L-live wire; The N-zero line; The GND-reference potential; The VBUS-direct voltage; The FU-fuse; P1, P21, P22, P41, P42-loop.
Embodiment
Fig. 2 A and Fig. 2 B are the circuit diagram according to the AC to DC converter with X electric capacity of the use power factor corrector of one embodiment of the invention, and circuit diagram difference shown in Fig. 2 A and Fig. 2 B only is that the loop P21 that indicates with dotted line is different with P22.Please be simultaneously with reference to Fig. 2 A and Fig. 2 B, AC to DC converter 2 of the present invention comprises electromagnetic interference (EMI) filter 21, rectifier filter 22, power factor corrector (PFC) 23 and discharge circuit 24.AC to DC converter 2 receives AC mains AC from public electric wire net, and is coupled to serial connection fuse FU on the path of live wire L or zero line N at its front end, burns internal circuit to prevent thunderbolt or big electric current.
In the present embodiment, rectifier filter 22 comprises bridge rectifier and filter.Bridge rectifier is by the first diode DB1, the second diode DB2, the 3rd diode DB 3 and four diodes of the 4th diode DB4 are formed, wherein the first diode DB1 anode tap and cathode terminal are coupled to rectifier filter 22 the 4th end 224 and first end 221 respectively, the second diode DB2 anode tap and cathode terminal are coupled to rectifier filter 22 second ends 222 and the 3rd end 223 respectively, the 3rd diode DB 3 anode taps and cathode terminal are coupled to rectifier filter 22 the 3rd end 223 and first end, 221, the four diode DB4 anode taps and cathode terminal respectively and are coupled to rectifier filter 22 second ends 222 and the 4th end 224 respectively.In another embodiment, bridge rectifier can have tapped transformer and two diodes are formed by a secondary side, transformer primary side two ends are rectifier filter 22 the 3rd end 223 and the 4th end 224, two diode anode ends are coupled to the Circuit Fault on Secondary Transformer two ends respectively, two diode cathode ends all are coupled to rectifier filter 22 first ends 221, and the Circuit Fault on Secondary Transformer centre tap is coupled to rectifier filter 22 second ends 222.In the present embodiment, filter is made up of filter capacitor CB, filter capacitor CB two ends cross-over connection is between rectifier filter 22 first ends 221 and second end 222, in order to reduce the ripple of rectifier filter 22 first ends 221 output voltages, 221 outputs of rectifier filter 22 first ends are pressed than galvanic current.In another embodiment, filter can be choke-condenser filter (as the LC filter) or pi type filter (as the CLC filter).
But, rectifier filter 22 uses bridge rectifier can cause the current distortion of AC mains AC input rectifying filter 22, generally by adding current waveform that PFC adjusts AC mains AC input in rectifier filter 22 rear ends to improve current distortion, especially the electronic installation of power more than 75W needs all at present to add that PFC is to meet the standard of harmonic current.PFC 23 is coupled to rectifier filter 22 first ends 221 and reference potential GND, and output high-level DC voltage VBUS, providing DC-DC converter to convert high-level DC voltage VBUS to different low-level DC voltage, be used for the electric supply of operating electronic devices so that provide.In the present embodiment, PFC 23 can use the circuit of PFC 13 as shown in Figure 1, it adopts active booster type (boost) DC-DC converter, so PFC 23 comprises PFC driver UPFC, power switch QPFC, inductance L PFC, diode DPFC and capacitor C PFC.PFC driver UPFC is according to the switching of the direct voltage VBUS FEEDBACK CONTROL power switch QPFC of PFC23 output, and when power switch QPFC conducting (ON), the input electrical power storage is stored in capacitor C PFC in inductance L PFC energy is provided to output; When power switch QPFC disconnected (OFF), input electric energy and the energy that is stored in inductance L PFC were provided to output, so export the direct voltage VBUS of representative value 380～400V during PFC 23 work.
When the voltage of rectifier filter 22 the 3rd end 223 is reduced to a certain degree, detect driver UDET and judge that AC mains AC is removed and output detection signal control discharge switch QDIS conducting, the electric charge that remain on the X capacitor C X this moment can be released by loop P22 shown in loop P21 shown in Fig. 2 A or Fig. 2 B.Definition X capacitor C X two ends are respectively first end and second end, and first end is coupled to zero line N and second end is coupled to live wire L.When X capacitor C X first terminal potential is higher than second terminal potential, the electric charge that remains on the X capacitor C X is released by loop P21 shown in Fig. 2 A, this loop P21 is by common mode inductance LF2, rectifier filter 22 the 4th end 224, the first diode DB1, rectifier filter 22 first ends 221, discharge resistance RDIS, the discharge switch QDIS that is conducting state, reference potential GND, rectifier filter 22 second ends 222, the second diode DB2, rectifier filter 22 the 3rd end 223 and common mode inductance LF1 form, and it is to utilize the discharge resistance RDIS in the loop to consume the electric charge that remains on the X capacitor C X.When X capacitor C X first terminal potential is lower than second terminal potential, the electric charge that remains on the X capacitor C X is released by loop P22 shown in Fig. 2 B, and this loop P22 is formed by common mode inductance LF1, rectifier filter 22 the 3rd end 223, the 3rd diode DB3, rectifier filter 22 first ends 221, discharge resistance RDIS, the discharge switch QDIS that is conducting state, reference potential GND, rectifier filter 22 second ends 222, the 4th diode DB4, rectifier filter 22 the 4th end 224 and common mode inductance LF2.
Because when AC mains AC was not removed, discharge switch QDIS disconnected and aforementioned loop P21 and P22 is opened circuit, so discharge resistance RDIS does not have power loss; Only detecting AC mains AC when being removed, just conducting and make aforementioned loop P21 and P22 path of discharge switch QDIS, discharge resistance RDIS is consumed the electric charge that remains on the X capacitor C X; Therefore, AC to DC converter 2 of the present invention can meet the more and more stricter requirement of standby power loss, must be less than the requirement of 150mW as the standby power loss.In addition, because discharge resistance RDIS is not that coupled in parallel is by X capacitor C X, so do not need the resistance value design of discharge resistance RDIS very big; In other words, the resistance value of discharge resistance RDIS can design much smaller than the resistance value of discharge resistance RX shown in Figure 1 shown in Fig. 2 A (or Fig. 2 B), therefore AC to DC converter 2 of the present invention can be released apace when AC mains AC is removed and be remained in electric charge on the X electric capacity, can make the voltage on the X electric capacity reduce to zero in 0.5 second according to experimental result.
Fig. 3 is the circuit diagram that detects driver UDET shown in Fig. 2 A (or Fig. 2 B).Please refer to Fig. 3, detect driver UDET and comprise rectifier diode DD, the first resistance R D1, the second resistance R D2, filter capacitor CD and driving switch QDET.Rectifier diode DD anode tap is coupled to and detects capacitor C S second end, and the first resistance R D1 and the second resistance R D2 coupled in series and cross-over connection are between rectifier diode DD cathode terminal and reference potential GND.Filter capacitor CD two ends cross-over connection is between the first resistance R D1 and the second resistance R D2 common joint A and reference potential GND.Driving switch QDET is for responding the first resistance R D1 and the second resistance R D2 common joint A powers on drops to the setting voltage output detection signal, with control discharge switch QDIS conducting.In the present embodiment, driving switch QDET is a PNP two-carrier junction transistor, and discharge switch QDIS is a NPN two-carrier junction transistor.When the first resistance R D1 and the second resistance R D2 common joint A power on drops to setting voltage, make driving switch QDET emitter terminal to base terminal pressure reduction during greater than the critical voltage (threshold voltage) of PNP two-carrier junction transistor, driving switch QDET conducting, direct voltage VCC is a high level voltage by the detection signal of current-limiting resistance RD and RDIS output, so the detection signal of high level voltage control discharge switch QDIS conducting.
Fig. 4 A and Fig. 4 B are the circuit diagram according to the AC to DC converter with X electric capacity that does not use power factor corrector of another embodiment of the present invention, and circuit diagram difference shown in Fig. 4 A and Fig. 4 B only is that the loop P41 that indicates with dotted line is different with P42.Please be simultaneously with reference to Fig. 4 A and Fig. 4 B, AC to DC converter 4 comprises electromagnetic interface filter 41, rectifier filter 42 and discharge circuit 44; In the present embodiment, electromagnetic interface filter 41 and rectifier filter 42 use the circuit of electromagnetic interface filter 21 and rectifier filter 22 shown in Fig. 2 A (or Fig. 2 B) respectively, and directly by rectifier filter 42 first ends 421 output dc voltage VBUS, other circuit working principle does not repeat them here.Discharge circuit 44 comprises the first rectifier diode DR1, the second rectifier diode DR2, discharge switch QDIS, discharge resistance RDIS and testing circuit.The first rectifier diode DR1 anode tap is coupled to rectifier filter 42 the 3rd end 423, the second rectifier diode DR2 anode tap is coupled to rectifier filter 42 the 4th end 424, the first rectifier diode DR1 cathode terminal is coupled to the second rectifier diode DR2 cathode terminal, discharge switch QDIS and discharge resistance RDIS coupled in series and cross-over connection are between first rectifier diode DR1 cathode terminal (or second rectifier diode DR2 cathode terminal) and reference potential GND, and testing circuit is coupled to rectifier filter 42 the 3rd end 423 or the 4th end 424 so that output detection signal control discharge switch QDIS conducting when detecting AC mains AC and be removed.
In the present embodiment, testing circuit comprises detection capacitor C S and detects driver UDET, detect capacitor C S coupled in series between rectifier filter 42 the 3rd end 423 and detection driver UDET, whether reduce because of AC mains AC is removed by the voltage that detects capacitor C S and detect rectifier filter 42 the 3rd end 423 and detect driver UDET, an embodiment who wherein detects driver UDET as shown in Figure 3.When the voltage of rectifier filter 42 the 3rd end 423 is reduced to a certain degree, detect driver UDET and judge that AC mains AC is removed and output detection signal control discharge switch QDIS conducting, the electric charge that remain on the X capacitor C X this moment can be released by loop P42 shown in loop P41 shown in Fig. 4 A or Fig. 4 B.When X capacitor C X first terminal potential is higher than second terminal potential, the electric charge that remains on the X capacitor C X is released by loop P41 shown in Fig. 4 A, and this loop P41 is formed by common mode inductance LF2, the second rectifier diode DR2, discharge resistance RDIS, the discharge switch QDIS that is conducting state, reference potential GND, rectifier filter 42 second ends 422, the second diode DB2, rectifier filter 42 the 3rd end 423 and common mode inductance LF1.When X capacitor C X first terminal potential is lower than second terminal potential, the electric charge that remains on the X capacitor C X is released by loop P42 shown in Fig. 4 B, and this loop P42 is formed by common mode inductance LF1, the first rectifier diode DR1, discharge resistance RDIS, the discharge switch QDIS that is conducting state, reference potential GND, rectifier filter 42 second ends 422, the 4th diode DB4, rectifier filter 42 the 4th end 424 and common mode inductance LF2.Similarly, the resistance value of discharge resistance RDIS can design much smaller than the resistance value of discharge resistance RX shown in Figure 1 shown in Fig. 4 A (or Fig. 4 B), therefore AC to DC converter 4 of the present invention can be released apace when AC mains AC is removed and be remained in electric charge on the X electric capacity, can make the voltage on the X electric capacity reduce to zero in 0.5 second according to experimental result.
In sum, AC to DC converter of the present invention is just controlled discharge resistance and is able to the charge discharging resisting that will remain on the X electric capacity when detecting AC mains and be removed, and therefore discharge resistance does not have power loss when AC mains is not removed; Moreover the resistance value of discharge resistance of the present invention does not need design very big, remains in electric charge on the X electric capacity so can release apace when AC mains is removed.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (10)
1. AC to DC converter is characterized in that it comprises:
One Electromagnetic interference filter is coupled to an AC mains, and described Electromagnetic interference filter comprises a safety electric capacity, and the cross-over connection of described safety electric capacity is between the live wire and zero line of described AC mains;
One rectifier filter, have one first end, one second end, one the 3rd end and one the 4th end, described rectifier filter second end is coupled to a reference potential, described rectifier filter the 3rd end and the 4th end are coupled to described safety electric capacity two ends respectively, and described rectifier filter is converted to a direct current voltage with described AC mains and exports by described rectifier filter first end;
One power factor corrector is coupled to described rectifier filter first end and described reference potential, in order to the current waveform of adjusting the input of described AC mains and export described direct voltage; And
One discharge circuit, comprise a discharge switch, a discharge resistance and a testing circuit, described discharge switch and described discharge resistance coupled in series and cross-over connection are between described rectifier filter first end and described reference potential, and described testing circuit is coupled to described rectifier filter the 3rd end or the 4th end so that export a detection signal when described AC mains is removed and control described discharge switch conducting detecting.
2. AC to DC converter according to claim 1 is characterized in that, described Electromagnetic interference filter more comprises:
Two common mode inductances are respectively coupled between described safety electric capacity two ends and the described rectifier filter.
3. AC to DC converter according to claim 1 is characterized in that, described rectifier filter comprises:
One bridge rectifier, comprise one first diode, one second diode, one the 3rd diode and one the 4th diode, described first diode anode end and cathode terminal are coupled to described rectifier filter the 4th end and first end respectively, described second diode anode end and cathode terminal are coupled to described rectifier filter second end and the 3rd end respectively, described the 3rd diode anode end and cathode terminal are coupled to described rectifier filter the 3rd end and first end respectively, and described the 4th diode anode end and cathode terminal are coupled to described rectifier filter second end and the 4th end respectively; And
One filter comprises a filter capacitor, and the two ends cross-over connection of described filter capacitor is between described rectifier filter first end and second end.
4. AC to DC converter according to claim 1 is characterized in that, described testing circuit comprises:
One detects electric capacity, has one first end and one second end, and described detection electric capacity first end is coupled to described rectifier filter the 3rd end or the 4th end; And
One detects driver, is coupled to described detection electric capacity second end, exports described detection signal when described AC mains is removed and controls described discharge switch conducting detecting.
5. AC to DC converter according to claim 4 is characterized in that, described detection driver comprises:
One rectifier diode, described rectifier diode anode tap are coupled to described detection electric capacity second end;
One first resistance and one second resistance, coupled in series and cross-over connection are between described rectifier diode cathode terminal and described reference potential;
One filter capacitor, the two ends cross-over connection is between described first resistance and described second resistance common joint and described reference potential; And
One driving switch is exported described detection signal and is controlled described discharge switch conducting for responding described first resistance and described second resistance common joint drops to a setting voltage that powers on.
6. AC to DC converter is characterized in that it comprises:
One Electromagnetic interference filter is coupled to an AC mains, and described Electromagnetic interference filter comprises a safety electric capacity, and the cross-over connection of described safety electric capacity is between the live wire and zero line of described AC mains;
One rectifier filter, have one first end, one second end, one the 3rd end and one the 4th end, described rectifier filter second end is coupled to a reference potential, described rectifier filter the 3rd end and the 4th end are coupled to described safety electric capacity two ends respectively, and described rectifier filter is converted to a direct current voltage with described AC mains and exports by described rectifier filter first end; And
One discharge circuit, comprise one first rectifier diode, one second rectifier diode, one discharge switch, one discharge resistance and a testing circuit, the described first rectifier diode anode tap is coupled to described rectifier filter the 3rd end, the described second rectifier diode anode tap is coupled to described rectifier filter the 4th end, the described first rectifier diode cathode terminal is coupled to the described second rectifier diode cathode terminal, described discharge switch and described discharge resistance coupled in series and cross-over connection are between described first rectifier diode cathode terminal and described reference potential, and described testing circuit is coupled to described rectifier filter the 3rd end or the 4th end so that export a detection signal when described AC mains is removed and control described discharge switch conducting detecting.
7. AC to DC converter according to claim 6 is characterized in that, described Electromagnetic interference filter more comprises:
Two common mode inductances are respectively coupled between described safety electric capacity two ends and the described rectifier filter.
8. AC to DC converter according to claim 6 is characterized in that, described rectifier filter comprises:
One bridge rectifier, comprise one first diode, one second diode, one the 3rd diode and one the 4th diode, described first diode anode end and cathode terminal are coupled to described rectifier filter the 4th end and first end respectively, described second diode anode end and cathode terminal are coupled to described rectifier filter second end and the 3rd end respectively, described the 3rd diode anode end and cathode terminal are coupled to described rectifier filter the 3rd end and first end respectively, and described the 4th diode anode end and cathode terminal are coupled to described rectifier filter second end and the 4th end respectively; And
One filter comprises a filter capacitor, and the two ends cross-over connection of described filter capacitor is between described rectifier filter first end and second end.
9. AC to DC converter according to claim 6 is characterized in that, described testing circuit comprises:
One detects electric capacity, has one first end and one second end, and described detection electric capacity first end is coupled to described rectifier filter the 3rd end or the 4th end; And
One detects driver, is coupled to described detection electric capacity second end, exports described detection signal when described AC mains is removed and controls described discharge switch conducting detecting.
10. AC to DC converter according to claim 9 is characterized in that, described detection driver comprises:
One rectifier diode, described rectifier diode anode tap are coupled to described detection electric capacity second end;
One first resistance and one second resistance, coupled in series and cross-over connection are between described rectifier diode cathode terminal and described reference potential;
One filter capacitor, the two ends cross-over connection is between described first resistance and described second resistance common joint and described reference potential; And
One driving switch is exported described detection signal and is controlled described discharge switch conducting for responding described first resistance and described second resistance common joint drops to a setting voltage that powers on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910135551A CN101873073A (en) | 2009-04-21 | 2009-04-21 | AC to DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910135551A CN101873073A (en) | 2009-04-21 | 2009-04-21 | AC to DC converter |
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| CN101873073A true CN101873073A (en) | 2010-10-27 |
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| CN200910135551A Pending CN101873073A (en) | 2009-04-21 | 2009-04-21 | AC to DC converter |
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN102075098B (en) * | 2009-11-25 | 2013-05-08 | 台达电子工业股份有限公司 | Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof |
| CN102611090B (en) * | 2011-01-19 | 2017-04-05 | 广州市金矢电子有限公司 | Capacitor pulse electric discharge device, capacitor fling-cut switch |
| CN102611090A (en) * | 2011-01-19 | 2012-07-25 | 广州市金矢电子有限公司 | Capacitance pulse discharging device and capacitance fling-cut switch |
| CN102684453A (en) * | 2011-03-07 | 2012-09-19 | 崇贸科技股份有限公司 | Starting circuit for discharging electromagnetic interference filter of power supply supplier |
| CN102684453B (en) * | 2011-03-07 | 2015-08-19 | 崇贸科技股份有限公司 | To the start-up circuit that the Electromagnetic interference filter of power supply unit is discharged |
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| CN103187861A (en) * | 2011-12-28 | 2013-07-03 | 立锜科技股份有限公司 | Self-discharge bleeder circuit, method, bleeder integrated circuit device and AC/DC interface |
| US9263939B2 (en) | 2012-01-20 | 2016-02-16 | Delta Electronics (Shanghai) Co., Ltd. | Capacitor discharging circuit and converter |
| CN103219878A (en) * | 2012-01-20 | 2013-07-24 | 台达电子企业管理（上海）有限公司 | Capacitor discharging circuit and power converter |
| CN103219877A (en) * | 2012-01-20 | 2013-07-24 | 台达电子企业管理（上海）有限公司 | Capacitor discharging circuit and converter |
| CN103219877B (en) * | 2012-01-20 | 2016-06-01 | 台达电子企业管理（上海）有限公司 | A kind of capacitor discharging circuit and changer |
| CN103219878B (en) * | 2012-01-20 | 2016-06-01 | 台达电子企业管理（上海）有限公司 | A kind of capacitor discharging circuit and power inverter |
| CN103516187A (en) * | 2012-06-19 | 2014-01-15 | 立锜科技股份有限公司 | Bleeder circuit and method for reducing power consumption of electromagnetic interference filter |
| CN102801339B (en) * | 2012-08-28 | 2014-07-16 | 矽力杰半导体技术(杭州)有限公司 | AC/DC voltage converting circuit with low stand-by power consumption and control method thereof |
| CN102801339A (en) * | 2012-08-28 | 2012-11-28 | 矽力杰半导体技术(杭州)有限公司 | AC/DC voltage converting circuit with low stand-by power consumption and control method thereof |
| CN103872887A (en) * | 2012-12-17 | 2014-06-18 | 尼克森微电子股份有限公司 | Low-power-consumption leakage circuit and AC (Alternating Current) conversion system with same |
| CN104810812A (en) * | 2014-01-28 | 2015-07-29 | 株式会社理光 | Electric apparatus and residual electric charge discharging method |
| CN104810812B (en) * | 2014-01-28 | 2017-11-21 | 株式会社理光 | Electric device and residual charge charging method |
| CN104269837B (en) * | 2014-10-17 | 2017-07-28 | 广东美的厨房电器制造有限公司 | Pull out electrical protective device |
| CN104269837A (en) * | 2014-10-17 | 2015-01-07 | 广东美的厨房电器制造有限公司 | Unplugging protection device |
| CN104754832A (en) * | 2015-03-30 | 2015-07-01 | 昂宝电子（上海）有限公司 | Led drive circuit and led lamp |
| CN109496028A (en) * | 2015-03-30 | 2019-03-19 | 昂宝电子（上海）有限公司 | LED drive circuit and LED lamp |
| CN105006956A (en) * | 2015-06-24 | 2015-10-28 | 珠海格力电器股份有限公司 | Rectifying and filtering circuit and electric appliance |
| CN105140901A (en) * | 2015-10-14 | 2015-12-09 | 珠海格力电器股份有限公司 | Circuit arrangement |
| CN105915041A (en) * | 2016-07-04 | 2016-08-31 | 珠海格力电器股份有限公司 | Charge bleeding method, bleeding circuit and current converter |
| CN107786104A (en) * | 2016-08-26 | 2018-03-09 | 天津市中马骏腾精密机械制造有限公司 | A kind of Intelligent sewing machine with novel AC-DC change-over circuit |
| CN106849021A (en) * | 2017-03-17 | 2017-06-13 | 深圳市禾望电气股份有限公司 | Semiconductor switch over-current detecting method and current transformer |
| CN108173423A (en) * | 2018-02-07 | 2018-06-15 | 东莞育嘉电子有限公司 | For the diode discharge circuit of chassis power supply |
| CN108173423B (en) * | 2018-02-07 | 2023-11-24 | 东莞育嘉电子有限公司 | Diode discharge circuit for chassis power supply |
| CN108471118A (en) * | 2018-03-29 | 2018-08-31 | 武汉大学 | Distributed Power Flow controller promotes the effect research method of total transfer capability expectation and power supply reliability |
| CN110798200A (en) * | 2019-11-18 | 2020-02-14 | 广东美的暖通设备有限公司 | Signal conversion device, control device and electric appliance |
| CN110798200B (en) * | 2019-11-18 | 2024-05-28 | 广东美的暖通设备有限公司 | Signal conversion device, control device and electric appliance |
| CN112117744A (en) * | 2020-09-18 | 2020-12-22 | 广东得语健康科技有限公司 | Residual voltage relief device |
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Application publication date: 20101027 |