CN202435263U - Power adapter - Google Patents
Power adapter Download PDFInfo
- Publication number
- CN202435263U CN202435263U CN201220060100XU CN201220060100U CN202435263U CN 202435263 U CN202435263 U CN 202435263U CN 201220060100X U CN201220060100X U CN 201220060100XU CN 201220060100 U CN201220060100 U CN 201220060100U CN 202435263 U CN202435263 U CN 202435263U
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- side circuitry
- primary
- voltage
- power supply
- power input
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Abstract
The utility model relates to a power adapter which comprises an alternating-current power input end, a transformer, a primary side circuit and a secondary side circuit, wherein the alternating-current power input end comprises a fire wire, a neutral wire and a ground wire, the primary side circuit is used for exciting a primary side winding of the transformer, and the secondary side circuit is used for converting induced voltage of a secondary winding of the transformer into direct-current voltage to be outputted. Especially, the power adapter further comprises a first capacitor and a second capacitor, wherein the first capacitor is electrically coupled between the ground wire of the alternating-current power input end and a first ground end of the primary side circuit, and the second capacitor is electrically coupled between the ground wire of the alternating-current power input end and a second ground end of the secondary side circuit. Market reject ratio of power adapters can be effectively lowered by means of the power adapter.
Description
Technical field
The utility model relates to a kind of power supply adaptor, is meant a kind of power supply adaptor that AC power is converted to DC power supply especially.
Background technology
Referring to shown in Figure 1; The power supply adaptor (adapter) that a kind of LCD of convention is used mainly comprises an ac power input end 11 (as: AC Socket) of accepting AC AC power (civil power) input; It has a live wire (Line; Abbreviation L), a neutral line (Neutral is called for short N) and is connected with the earth point G1 of building below, place to connect to ground wire (Earth is called for short E) greatly; The EMI filter circuit 12 that the AC power that live wire L and neutral line N by ac power input end 11 are imported is carried out EMI differential mode noise and common-mode noise filtering; EMI noise and the inner EMI noise of power supply changeover device to isolate electrical network are crosstalked mutually; AC power to 12 outputs of EMI filter circuit is carried out the bridge rectifier 13 of full-wave rectification to produce a direct current pulsating voltage; One is utilized filter circuit (figure does not show) that dc pulse moving voltage is carried out filtering; The direct current that has the low voltage ripple with generation is excitatory to the primary side winding Np of transformer T1; Make the primary-side circuitry 14 of switching energy to the primary side winding Ns of transformer T1; After a induced voltage with primary side winding Ns is rectified into a direct current and filtering voltage ripple composition wherein; Export the secondary-side circuitry 15 that the drive circuit of motherboard circuit and the liquid crystal panel fluorescent tube of a direct current voltage liquid crystal display uses, and a feedback circuit 16, its this direct voltage of taking a sample; And, make the voltage of transformer T1 output after secondary-side circuitry 15 rectifying and wave-filterings, produce the galvanic current pressure finally via the pwm chip in an optocoupler (figure does not show) the output one controlling signal control primary-side circuitry 14.
Wherein one first earth terminal P1 of primary-side circuitry 14 is connected with one first reference potential G2; And one second earth terminal P2 of secondary-side circuitry 15 is connected with one second reference potential G3; And, make the reference potential G2 that wins different with the second reference potential G3 because between primary-side circuitry 14 and the secondary-side circuitry 15 transformer T1 and light-coupled isolation are arranged.Right because di/dt and the dv/dt high-frequency noise that electronic components such as the MOS switch electronic part in the primary-side circuitry 14 (figure does not show), transformer T1 produce when work; Can between circuit trace (trace), crosstalk each other everywhere; If these high-frequency noises can not be by timely derivation; Pwm chip in the primary-side circuitry 14 (figure does not show) is interfered and can not steady operation; And maybe be through near live wire L in the ac input end 11 and the neutral line N network system being crosstalked into, resultant interference can't normally use miscellaneous equipment to other electric equipment of electrical network near.Therefore, convention way is connected in series a high voltage bearing safety Y capacitor C usually between the earth terminal P2 of the earth terminal P1 of primary-side circuitry 14 and secondary-side circuitry 15
Y, make the high-frequency noise that primary-side circuitry 14 is produced lead the earth terminal P2 of secondary-side circuitry, be connected with the ground wire E of power supply changeover device via earth terminal P2 again, and finally the ground wire E of power supply changeover device is connected with earth point G1 and is directed at the earth.
In addition; In order to prevent because of the impedance ground of the earth point G1 of part ShareBuilder thing big (imperfect earth) or when not being connected to the earth; The low-frequency noise that near other electronic product of electrical network produces possibly arrive the earth terminal of the motherboard of LCD via the ground wire E of power supply changeover device through the earth terminal P2 of secondary-side circuitry 15; The image processing circuit of the noise jamming of final low frequency in the motherboard, cause liquid crystal display picture to occur as: water wave wave interference or netted striped interference problem; The current practice high-pass filtering circuit 17 that serial connection is composed in parallel by a resistance R 1 and a capacitor C 1 between the earth terminal P2 of ground wire E and secondary-side circuitry 15 usually gets into the motherboard circuit of LCD to stop low-frequency noise via earth terminal P2.
Yet when the building electrical network is struck by lightning; As: thunderbolt is warmd oneself in front of a fire line end L when squeezing into a high voltage via earth point G1 and ground wire E; Shown in the equivalent electric circuit of Fig. 2; Its discharge path is the live wire L of a common mode inductance L 1 à ac input end 11 in the ground wire E à high-pass filtering circuit 17 à bridge rectifiers 13 rectifier diode D1 à electromagnetic interface filter 12 wherein; That is: from earth point G1 live wire end L is made a call to a high voltage pulse (need to prove: the common mode inductance L1 Fig. 2 only draws and connects 1/2 winding of live wire end L, and wherein the anode of a rectifier diode D1 is electrically connected via earth terminal P2 and earth point G2 in the bridge rectifier, and its negative terminal is electrically connected with the 1/2 common mode inductance L1 that is connected live wire end L) during thunderbolt; At this moment; The maximum withstand voltage that then might exceed resistance R 1 and capacitor C 1 two ends too greatly to the pulse voltage or the energy of live wire end L thunderbolt because of earth point G1, or resistance R 1 and capacitor C 1 can't bear big electric current of moment, and resistance R 1 and/or capacitor C 1 just might burst; And the conduction dust of its generation can adhere to the electronic component of nigh feedback circuit 16; Cause power supply adaptor 1 output instability maybe can't export, make to be arranged on power supply adaptor 1 in the LCD when thunderstorm season, be directed at R1/C1 and burst because of being hit by thunder and lightning; And finally be directed at power supply adaptor 1 no-output, increased the bad maintenance cost in liquid crystal display product market simultaneously.
Summary of the invention
Therefore; The purpose of the utility model; Promptly a kind of power supply adaptor is being provided; It lets high frequency E MI noise that this power supply adaptor primary-side circuitry and secondary-side circuitry produce can be respectively release in the electrical network the earth through the first capacitor C y and second capacitor C 1, has reduced the EMI noise and has been crosstalked near network system with neutral end N and interferes with the normal use of other electric equipment of network system from the live wire end L of ac input end; And can intercept because of the impedance ground of the earth point G1 of part ShareBuilder thing big (imperfect earth) or when not being connected to the earth, the low-frequency noise that near other electronic product of electrical network produces possibly cause the liquid crystal panel interference problem via the earth terminal that the ground wire E of the power supply adaptor earth terminal P2 through secondary-side circuitry 15 arrives the motherboard of LCD; Energy finally is directed at power supply adaptor market fraction defective rising problem through second capacitor C 1 when having avoided thunderbolt simultaneously.
For achieving the above object; The power supply adaptor of the utility model comprises an ac power input end that comprises a live wire, a neutral line and a ground wire and accept AC power input; A transformer; A primary-side circuitry excitatory to the primary side winding of this transformer; And the induced voltage to the primary side winding of this transformer carries out rectifying and wave-filtering to export the secondary-side circuitry of a direct current voltage, and wherein this primary-side circuitry has one first earth terminal, and this secondary-side circuitry has one second earth terminal; Particularly; This power supply adaptor also comprises first electric capacity of an electric coupling between first earth terminal of the ground wire of this ac power input end and this primary-side circuitry, and second electric capacity of an electric coupling between second earth terminal of the ground wire of this ac power input end and this secondary-side circuitry.
Preferably, this power supply adaptor also comprise one with this second electric capacity parallel resistor.
Preferably, this first electric capacity is to meet the Y electric capacity that safety requires.
Preferably; This power supply adaptor also comprise one with the live wire of this ac power input end and neutral line electric coupling to accept the EMI filter circuit of this AC power input; The bridge rectifier that the AC power of this EMI filter circuit output is carried out full-wave rectification; And one the sampling this direct voltage to control this primary-side circuitry; The feedback circuit that this secondary-side circuitry output galvanic current is pressed, and this primary-side circuitry to the rectification of this bridge rectifier output after voltage carry out offering transformer after the filtering and carry out the voltage energy conversion and control the conversion of this transformer energy together with feedback circuit.
The effect of the utility model is by between the first earth terminal P1 of the ground wire of ac power input end and primary-side circuitry, being connected in series first capacitor C
YThe high-frequency noise that produces in the primary-side circuitry is directed to the earth via ground wire; And by second electric capacity (and with the second electric capacity parallel resistor) is set between second earth terminal of the ground wire of ac input end and secondary-side circuitry; And stop because of the impedance ground of the earth point G1 of ShareBuilder thing big (imperfect earth) or when not being connected to the earth; Near the low-frequency noise of other electronic product of electrical network via ground wire through the crosstalk earth terminal of the motherboard that arrives LCD of second earth terminal of secondary-side circuitry; The image processing circuit of the noise jamming of final low frequency in the motherboard, cause liquid crystal display picture to occur as: water wave wave interference or netted striped interference problem, the EMI high-frequency noise that produces of secondary-side circuitry can see through second electric capacity and release and be directed to the earth to ground wire simultaneously; And high pressure and the instantaneous large-current that produces of avoiding being struck by lightning passes through second electric capacity or resistance; Make not reason suffer high voltage pulse and the big electric current of momentary pulse and burst and cause power supply adaptor output instability maybe can't export; And can effectively reduce the market fraction defective of power supply adaptor (adapter), reach the purpose of the utility model.
Description of drawings
Fig. 1 is the main circuit calcspar of convention power supply changeover device;
Fig. 2 is the discharge path equivalent electric circuit of convention power supply changeover device when being struck by lightning;
Fig. 3 is the main circuit calcspar of a preferred embodiment of the utility model power supply changeover device; And
Fig. 4 is the discharge path equivalent electric circuit of the power supply changeover device of present embodiment when being struck by lightning.
[primary clustering symbol description]
21 ac power input ends, 22 EMI filter circuits
23 bridge rectifiers, 24 primary-side circuitry
25 secondary-side circuitry, 26 feedback circuits
27 high-pass filtering circuits
The L live wire N neutral line
E ground wire G1 earth point
T1 transformer Np primary side winding
Ns primary side winding P1 first earth terminal
The P2 second earth terminal G2 first reference potential
The G3 second reference potential C
YFirst electric capacity
The C1 second electric capacity R1 resistance
D1 rectifier diode L1 common mode inductance.
Embodiment
The utility model power supply adaptor (adapter) is an AC/DC transducer; It can be inserted in LCD or other needs the input feeder ear of the electronic equipment of DC power supply with power supply adaptor direct current output plug, for LCD or other need the electronic equipment of DC power supply that electric energy is provided.Referring to shown in Figure 3; First preferred embodiment of the utility model power supply adaptor comprises mainly that in regular turn an ac power input end 21, an EMI (electromagnetic interference) filter 22, a bridge rectifier 23, a transformer T1, of serial connection are located at the secondary-side circuitry 25 of primary side winding Np and the primary side winding Ns that the primary-side circuitry between the bridge rectifier 23 24, is located at transformer T1 of transformer T1, and a feedback circuit 26.
Ac power input end 21 is AC Socket of for example power supply adaptor; It comprises a live wire L, a neutral line N and a ground wire E; Wherein live wire L and neutral line N accept AC power (for example civil power) input, and ground wire E is connected to connect the earth in order to the earth point G1 with building below, place.
The live wire L and the neutral line N electric coupling of electromagnetic interface filter 22 and ac power input end 21, accepting this AC power input, and the EMI noise in the filtering AC power is to export an alternating voltage.
Primary-side circuitry 24 mainly comprises the switching circuit and that a filter circuit, is made up of the MOS power switch and drives this switching circuit conducting whether pwm control circuit.Dc pulse moving voltage after the full-wave rectification converts dc pulse moving voltage into the direct voltage with low voltage ripple through the filter circuit (filter capacitor) in the primary-side circuitry 24; And offer the primary side winding Np of transformer T1; Carry out the voltage energy conversion by transformer T1, make the primary side winding Ns of transformer T1 produce an induced voltage.Secondary-side circuitry 25 is current rectifying and wave filtering circuits; After it is rectified into direct voltage and filtering voltage ripple composition wherein with this induced voltage; Export a direct current voltage and give a load end; For example above-mentioned LCD; Wherein the part of direct voltage is supplied the drive circuit of the liquid crystal panel fluorescent tube of LCD, and another part of direct voltage converts for example 5V voltage to via the DC-to-dc converter in the motherboard circuit of LCD, as the working power of each circuit module on the motherboard and as the working power in the liquid crystal panel drive circuit.
The direct voltage of feedback circuit 26 sampling secondary-side circuitry 25 outputs; And finally export the pwm control circuit that a controlling signal is controlled primary-side circuitry 24 via an optocoupler (figure does not show); Make the ON time that changes the MOS power switch, finally make secondary-side circuitry 25 be able to export galvanic current and press.And because above-mentioned EMI filter circuit 22, bridge rectifier 23, primary-side circuitry 24, secondary-side circuitry 25 and feedback circuit 26 is all convention circuit and non-the utility model emphasis, so its composition and working method are not detailed in this.
In addition, one first earth terminal P1 of primary-side circuitry 24 is connected with one first reference potential G2, and one second earth terminal P2 of secondary-side circuitry 25 is connected with one second reference potential G3, and couples mutually with the earth terminal of the motherboard of LCD.And because between primary-side circuitry 24 and the secondary-side circuitry 25 transformer T1 and light-coupled isolation are arranged, so the first reference potential G2 is different with the second reference potential G3.But because di/dt and dv/dt high-frequency noise that electronic components such as MOS power switch in the primary-side circuitry 24 and transformer T1 produce when work can be crosstalked between circuit trace (trace) everywhere each other; If these high-frequency noises can not be by timely derivation; Possibly make pwm control circuit be interfered and can not stably work; And maybe be through near live wire L in the ac input end 21 and the neutral line N network system being crosstalked into, resultant interference can't normally use miscellaneous equipment to other electric equipment of electrical network near.
Therefore, for addressing the above problem, present embodiment power supply changeover device 1 also comprises first capacitor C of an electric coupling between the first earth terminal P1 of the ground wire E of ac power input end 21 and primary-side circuitry 24
Y, and first capacitor C in the present embodiment
YBe the high voltage bearing Y electric capacity that employing one meets the safety grade, it can be directed to the high-frequency noise that produces in the primary-side circuitry 24 earth point G1 and import the earth via ground wire E.And the appearance value of the first capacitor C y can decide according to EMI test result and safety leakage current test result, between 220pF ~ 4700pF, does selection usually.
In addition; When the earth point G1 of building below does not do good ground connection or not even during ground connection; If when also having other earth point G1 that suppresses the more weak electronic equipment ShareBuilder thing of electromagnetic interference capability; The low-frequency noise that this electronic equipment produces just is easy to disturb from the earth terminal that earth point G1 arrives the motherboard of LCD via the ground wire E of the power supply changeover device second earth terminal P2 through secondary-side circuitry 25 display frame of LCD, cause liquid crystal display picture to occur as: water wave wave interference or netted striped interference problem.
Therefore; For the low-frequency noise that prevents near other electronic product electrical network via electric network terminal user's supply socket or insert row ground end through ground wire E; And the Circuits System of the LCD of crosstalking; Present embodiment also comprises a resistance R 1 and second capacitor C 1 parallelly connected with resistance R 1 between the second earth terminal P2 of the ground wire E that is connected ac power input end 21 and secondary-side circuitry 25; This resistance R 1 and second capacitor C 2 are formed a high-pass filtering circuit 27, and the low-frequency noise that can stop other electronic product is via the crosstalk Circuits System of LCD of the second earth terminal P2 of ground wire E through secondary-side circuitry 25.Wherein second capacitor C 1 adopts about appearance value 1nF ~ 0.47 μ F usually, withstand voltage 50V or 100V, and the MLCC that volume is little, cost is low (paster) electric capacity, and the resistance of resistance R 1 is about about 1K ~ 1M.
In addition, when building is struck by lightning, thunderbolt through earth point G1 towards the ground wire E of alternating current input 21 when live wire L squeezes into a high voltage, shown in the equivalent electric circuit of Fig. 4, its discharge path is ground wire E à first capacitor C
YThe live wire L of a common mode inductance L 1 à alternating current input 21 in the à bridge rectifier 23 rectifier diode D1 à electromagnetic interface filter 12 wherein; Make the resistance R 1 and second capacitor C 1 in the high-pass filtering circuit 27 avoid the lightning discharge path; And avoid bearing the moment powerful voltage and electric current of thunderbolt; Avoiding the resistance R 1 and second capacitor C 1 maybe can't bear instantaneous large-current because of withstand voltage deficiency bursts; Can further avoid conduction dust that the resistance R 1 and second capacitor C 1 burst generation attached near the electronic component of feedback circuit 26 and cause power supply adaptor 1 output instability maybe can't export, therefore, can effectively reduce the market fraction defective of power supply adaptor 1.
What deserves to be mentioned is that the resistance R 1 in the high-pass filtering circuit 27 can also be omitted.
In sum, the foregoing description is by between the first earth terminal P1 of the ground wire E of ac power input end 21 and primary-side circuitry 24, being connected in series first electric capacity (safety Y electric capacity) C
YThe high-frequency noise that produces in the primary-side circuitry 24 is directed to earth point G1 and imports the earth via ground wire E; And by between the second earth terminal P2 of the ground wire E of ac power input end 21 and secondary-side circuitry 25, high-pass filtering circuit 27 being set; Stop because of the impedance ground of the earth point G1 of the building shared big (imperfect earth) or when not being connected to the earth; Near the low-frequency noise of other electronic product of electrical network via ground wire through the crosstalk earth terminal of the motherboard that arrives LCD of second earth terminal of secondary-side circuitry; And the display frame of the LCD of crosstalking, cause liquid crystal display picture to occur as: water wave wave interference or netted striped interference problem, the high frequency E MI noise that produces in the secondary-side circuitry 25 simultaneously also can be released through high-pass filtering circuit 27 and be directed to earth point G1 to ground wire E and import the earth.And high pressure and the instantaneous large-current that produces of avoiding being struck by lightning passes through high-pass filtering circuit 27; Make resistance R 1 and/or capacitor C 1 in the high-pass filtering circuit 27 avoid suffering high pressure and instantaneous large-current and burst and cause power supply adaptor 1 output instability maybe can't export; Can effectively reduce the market fraction defective of power supply adaptor 1, reach the effect and the purpose of the utility model.
The above person of thought; Be merely the preferred embodiment of the utility model; When not limiting the scope that the utility model is implemented with this; Promptly change according to the utility model claim and the simple equivalent done of invention description generally and modify, all still belong in the scope that the utility model patent contains.
Claims (4)
1. power supply adaptor; Comprise an ac power input end that comprises a live wire, a neutral line and a ground wire and accept AC power input; A transformer, a primary-side circuitry excitatory to the primary side winding of this transformer, and the induced voltage to the primary side winding of this transformer carries out rectifying and wave-filtering to export the secondary-side circuitry of a direct current voltage; Wherein this primary-side circuitry has one first earth terminal, and this secondary-side circuitry has one second earth terminal; It is characterized in that:
This power supply adaptor also comprises:
One first electric capacity, electric coupling is between first earth terminal of the ground wire of this ac power input end and this primary-side circuitry; And
One second electric capacity, electric coupling is between second earth terminal of the ground wire of this ac power input end and this secondary-side circuitry.
2. power supply adaptor according to claim 1 is characterized in that: also comprise one with this second electric capacity parallel resistor.
3. power supply adaptor according to claim 1 and 2 is characterized in that: wherein this first electric capacity is safety Y electric capacity.
4. power supply adaptor according to claim 3; It is characterized in that: wherein this power supply adaptor also comprise one with the live wire of this ac power input end and neutral line electric coupling to accept the EMI filter circuit of this AC power input; AC power to this EMI filter circuit output is carried out full-wave rectification; To export the bridge rectifier of a direct current pulsating voltage; And one the sampling this direct voltage to control this primary-side circuitry; The feedback circuit that this secondary-side circuitry output galvanic current is pressed, and this primary-side circuitry to the rectification of this bridge rectifier output after voltage carry out filtering and have the direct current of low voltage ripple to produce one, and offer transformer and carry out the voltage energy conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220060100XU CN202435263U (en) | 2012-02-23 | 2012-02-23 | Power adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220060100XU CN202435263U (en) | 2012-02-23 | 2012-02-23 | Power adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202435263U true CN202435263U (en) | 2012-09-12 |
Family
ID=46784672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220060100XU Withdrawn - After Issue CN202435263U (en) | 2012-02-23 | 2012-02-23 | Power adapter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202435263U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594122A (en) * | 2012-02-23 | 2012-07-18 | 福建捷联电子有限公司 | Power adaptor |
| CN104052285A (en) * | 2014-03-18 | 2014-09-17 | 江苏中利电子信息科技有限公司 | DC power supply converter board |
| CN109980953A (en) * | 2019-04-14 | 2019-07-05 | 查正春 | A kind of sound equipment power source special adapter |
| CN110308322A (en) * | 2019-06-29 | 2019-10-08 | 杭州涂鸦信息技术有限公司 | A method of calculating power supply adaptor electricity |
-
2012
- 2012-02-23 CN CN201220060100XU patent/CN202435263U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594122A (en) * | 2012-02-23 | 2012-07-18 | 福建捷联电子有限公司 | Power adaptor |
| CN102594122B (en) * | 2012-02-23 | 2014-09-17 | 福建捷联电子有限公司 | Power adaptor |
| CN104052285A (en) * | 2014-03-18 | 2014-09-17 | 江苏中利电子信息科技有限公司 | DC power supply converter board |
| CN104052285B (en) * | 2014-03-18 | 2017-12-01 | 江苏中利电子信息科技有限公司 | D/C power change-over panel |
| CN109980953A (en) * | 2019-04-14 | 2019-07-05 | 查正春 | A kind of sound equipment power source special adapter |
| CN110308322A (en) * | 2019-06-29 | 2019-10-08 | 杭州涂鸦信息技术有限公司 | A method of calculating power supply adaptor electricity |
| CN110308322B (en) * | 2019-06-29 | 2021-07-23 | 杭州涂鸦信息技术有限公司 | Method for calculating electric quantity of power adapter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120912 Effective date of abandoning: 20140917 |
|
| RGAV | Abandon patent right to avoid regrant |