CN104752031A - Pulse transformer, switching power supply with same and residual current device - Google Patents

Pulse transformer, switching power supply with same and residual current device Download PDF

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Publication number
CN104752031A
CN104752031A CN201310740947.1A CN201310740947A CN104752031A CN 104752031 A CN104752031 A CN 104752031A CN 201310740947 A CN201310740947 A CN 201310740947A CN 104752031 A CN104752031 A CN 104752031A
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CN
China
Prior art keywords
pulse transformer
winding
switching power
power supply
transformer according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201310740947.1A
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Chinese (zh)
Inventor
董天帅
卢向东
包章尧
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Siemens AG
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Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to CN201310740947.1A priority Critical patent/CN104752031A/en
Priority to DE102014226963.6A priority patent/DE102014226963A1/en
Publication of CN104752031A publication Critical patent/CN104752031A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a pulse transformer for a switching power supply in a residual current device. The pulse transformer comprises a packaging shell (100), a plurality of first electric lead-out devices and a plurality of second electric lead-out devices. Primary side windings and secondary side windings are packaged inside the packaging shell (100); the first electric lead-out devices are electrically connected to the primary side windings, the second electric lead-out devices are electrically connected to the secondary side windings, and the first electric lead-out devices and/or the second electric lead-out devices are fly wires (7 and 8). The invention further provides the switching power supply and the residual current device.

Description

A kind of pulse transformer and comprise its Switching Power Supply and earth leakage protective device
Technical field
The present invention relates to a kind of pulse transformer, particularly relate to a kind of pulse transformer of the Switching Power Supply for earth leakage protective device.
Background technology
Earth leakage protective device (RCD) is a kind of widely used circuit protector, is used for opening when equipment generation leak current fault circuit breaker in main circuit with power supply of cutting off the electricity supply, thus prevents the generation of electric shock accidents.Current earth leakage protective device generally adopts Switching Power Supply (Switching Mode Power Supply, SMPS) to power to the earth leakage protective device of its inside.The circuit of Switching Power Supply of the prior art as shown in Figure 1, generally includes: fuse F, is connected to the AC power AC powered to Switching Power Supply, as overcurrent protection; Rectification unit R, for being converted to direct current by alternating current; Filter unit C1, for reducing the fluctuation of the voltage that rectification unit R exports; Pulse transformer T, for receiving electric energy from rectification unit R and filter unit C1, and realize the energy transferring of former avris to secondary side, wherein the former avris of pulse transformer T comprises former limit winding L p1with auxiliary winding L p2, the secondary side of pulse transformer T comprises vice-side winding L s; Control unit U, for the turn-on and turn-off of control impuls transformer T; Output unit, comprises diode D, filtering capacitor C2 and resistance R o, receive electric energy for the secondary side joint from pulse transformer T and provide voltage V to earth leakage protective device (not shown) o.
According to IEC (being called for short IEC standard) and the requirement of Special safety low-voltage standards; being applied in input voltage range is that earth leakage protective device in 85V ~ 760V ac power supply system needs can by 8KV mono-minute or the dielectric voltage withstand experiment in 9.6KV mono-second, and this just needs to make the Switching Power Supply of powering to earth leakage protective device have the withstand voltage performance of height.And the part that in Switching Power Supply, withstand voltage properties is the poorest is pulse transformer T, therefore the withstand voltage properties of pulse transformer T becomes the key factor that Switching Power Supply withstand voltage properties promotes.
As shown in Figure 1, pulse transformer T comprises the former limit winding L of former avris p1with auxiliary winding L p2, and the vice-side winding L of secondary side s.Former limit winding L p1drawn by pin 1 and pin 2, auxiliary winding L p2drawn by pin 3 and pin 4, vice-side winding L sdrawn by pin 5 and pin 6.Fig. 2 shows the structural representation of pulse transformer T.As shown in Figure 2, pulse transformer T comprises encapsulating housing 10 and pin 1,2,3,4,5 and 6, is packaged with former limit winding L in this encapsulating housing p1, auxiliary winding L p2and vice-side winding L s(not shown in Fig. 2).Its limit, Central Plains winding L p1be drawn out to outside encapsulating housing 10 by pin 1,2, auxiliary winding L p2be drawn out to outside encapsulating housing 10 by pin 3,4, vice-side winding L sbe drawn out to outside encapsulating housing 10 by pin 5,6.Due to the needs of the mounting process of pulse transformer T, the surface of pin 1,2,3,4,5 and 6 is exposed, can not be coated with insulating layer coating.And when Switching Power Supply bears high pressure, the winding L of the former avris of pulse transformer T p1, L p2with the winding L of secondary side sbetween there is higher electrical potential difference, therefore former avris pin 1, easily there is arcing events between 2,3,4 and the pin 5,6 of secondary side, affect the withstand voltage properties of pulse transformer T.Therefore, in prior art usually by increasing the pin 1 of former avris, the mode of the distance D between 2,3,4 and the pin 5,6 of secondary side prevents the generation of arcing events, improves the withstand voltage properties of pulse transformer T with this.Under normal circumstances, this distance D needs to be greater than 14mm, causes the volume of pulse transformer T excessive.But because the volume of earth leakage protective device is usually very little, the so big pulse transformer of volume cannot meet the requirement of earth leakage protective device for small size.
Summary of the invention
The present invention aims to provide a kind of pulse transformer for the Switching Power Supply in earth leakage protective device, meeting the high requirement of resistance to pressure, can reduce volume again.
The invention provides a kind of pulse transformer for the Switching Power Supply in earth leakage protective device, comprising:
Encapsulating housing, its enclosed inside has former avris winding and secondary side winding;
Be electrically connected to multiple first electric ejectors of described former avris winding,
Be electrically connected to multiple second electric ejectors of described secondary side winding,
Described multiple first electric ejector and/or described multiple second electric ejector are fly line.
In technical scheme provided by the invention, utilize surperficial fly line to instead of pin of the prior art, the minimum range between pin is not limited, can be set to very little, the volume of the encapsulating housing of pulse transformer therefore can be made to be made very little.
According to pulse transformer provided by the invention, wherein said multiple first electric ejector is pin, and described multiple second electric ejector is fly line.
According to pulse transformer provided by the invention, described multiple second electric ejector is pin, and described multiple first electric ejector is fly line.
Invention invention is according to pulse transformer provided by the invention, and described former avris winding comprises former limit winding and auxiliary winding.
Invention is according to pulse transformer provided by the invention, and described fly line and its former avris winding be connected to or secondary side are formed winding integratedly.
According to pulse transformer provided by the invention, the wire that described fly line has insulating barrier by surface is formed, and one end extended to outside described encapsulating housing of described fly line is exposed end.
According to pulse transformer provided by the invention, described multiple first electric ejector and described multiple second electric ejector have exposed electrical joint outside described encapsulating housing, and the minimum range between the exposed electrical joint of described multiple first electric ejector and the exposed electrical joint of described multiple second electric ejector is greater than predetermined threshold.
According to pulse transformer provided by the invention, described predetermined threshold is 14mm.
According to pulse transformer provided by the invention, between described former avris winding and described secondary side winding, there is copper foil shielding layer.
Present invention also offers a kind of Switching Power Supply comprising above-mentioned pulse transformer.
According to pulse transformer provided by the invention; comprise rectification unit described in rectification unit and filter unit and be connected to AC power by the first wire-wound resistor; be connected with the second wire-wound resistor between described rectification unit and described filter unit, described first wire-wound resistor and the second wire-wound resistor are used for providing overcurrent protection.
By have employed dual wire-wound resistor more protection, even if one of them lost efficacy, another also can continue protective circuit, added reliability
Present invention also offers a kind of earth leakage protective device comprising above-mentioned pulse transformer.
Pulse transformer provided by the invention, can be made volume very little under the prerequisite meeting resistance to pressure, the wiring of other circuit element around it of being more convenient for.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is the circuit diagram of Switching Power Supply of the prior art;
Fig. 2 is the structural representation of pulse transformer of the prior art;
Fig. 3 is the structural representation of pulse transformer according to an embodiment of the invention;
Fig. 4 is the circuit diagram of Switching Power Supply according to an embodiment of the invention.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
Embodiment 1
The present embodiment provides a kind of pulse transformer for the Switching Power Supply in earth leakage protective device, and its structure as shown in Figure 3, comprising:
Encapsulating housing 100, its enclosed inside has the former limit winding of former avris and auxiliary winding, and the vice-side winding of secondary side (not shown in Fig. 3).
Multiple pin 1,2,3,4, through encapsulating housing 100, is electrically connected with the circuit element of encapsulating housing 100 outside for making multiple winding of encapsulating housing 100 inside.The two ends of its limit, Central Plains winding are connected respectively to pin 1 and pin 2, and the two ends of auxiliary winding are connected respectively to pin 3 and pin 4.Pin 1,2 and pin 3,4 are arranged in the both sides of encapsulating housing 100 respectively.
Fly line 7 and fly line 8, the wire by surface with insulating barrier is formed.One end of fly line 7 and fly line 8 is electrically connected to the two ends of the vice-side winding being positioned at encapsulating housing 100 inside respectively.The other end of fly line 7 and fly line 8 is drawn from the inside of encapsulating housing 100, and at the tip place of this end, there is exposed end, expose the wire of insulating barrier inside at this exposed end place, the circuit element (the diode D such as shown in Fig. 1 and filtering capacitor C2) for the vice-side winding with encapsulating housing 100 outside that make encapsulating housing 100 inside is electrically connected.After this pulse transformer is mounted, the minimum range D between the exposed end of fly line 7,8 and the nearest pin (i.e. pin 3,4) of pin 1,2,3 and 4 middle distance is made to be greater than 14mm.
In the pulse transformer that the present embodiment provides, the fly line 7,8 utilizing surface to have insulating barrier instead of pin of the prior art.Making the minimum range D between the exposed end of fly line 7 and fly line 8 and pin 3,4 be greater than a certain threshold value (is 14mm in the present embodiment, in other embodiments, those skilled in the art can select other threshold value neatly according to the withstand voltage needs of reality), thus prevent the generation of arcing events.Because the former limit winding of the former avris of encapsulating housing 100 and auxiliary winding switching are to common earth potential, therefore arcing events can not be there is between pin 1,2 and pin 3,4.So the minimum range between pin 1,2 and pin 3,4 does not limit, can be set to very little.Therefore the volume of whole encapsulating housing 100 can not be subject to the restriction of the minimum range between pin 1,2 and pin 3,4, so can be made very little.Therefore, the cumulative volume of pulse transformer that the present embodiment provides can be made very little under the prerequisite meeting resistance to pressure.
In the present embodiment, utilize fly line 7,8 that vice-side winding is drawn out to outside encapsulating housing, but this and nonrestrictive.Such as, according to other embodiments of the invention, vice-side winding also can be made to be drawn by pin, and the former limit winding of former avris and auxiliary winding are drawn out to outside encapsulating housing by four fly lines.Again such as, the winding of the winding of secondary side and former avris can also be made all to be drawn out to outside encapsulating housing by fly line.
According to other embodiments of the invention, for former avris, there is one or more winding, secondary side has the pulse transformer of one or more winding, make the winding of wherein at least side be drawn out to outside encapsulating housing by fly line, the object reducing volume can be realized under the prerequisite not affecting resistance to pressure.
According to other embodiments of the invention, wherein fly line 7,8 can form with vice-side winding, and namely fly line is extended to outside encapsulating housing 100 by the coiling of vice-side winding and formed.Fly line 7,8 can be also independent wire, is electrically connected to the two ends of vice-side winding by modes such as welding.
In the present embodiment, pin 1,2 and pin 3,4 are arranged in the both sides of encapsulating housing 100 respectively, and pulse transformer can be made like this more firmly mounted.According to other embodiments of the invention, wherein pin 1,2 and pin 3,4 also can be arranged in the same side of encapsulating housing 100, and fly line 7,8 is drawn from the opposite side of encapsulating housing 100, the distance that fly line 7,8 extends can be reduced like this, thus reduce the space shared by pulse transformer further.
According to other embodiments of the invention, its limit, Central Plains winding and can copper foil shielding layer be provided with between auxiliary winding and vice-side winding, to improve Electro Magnetic Compatibility.
Embodiment 2
As shown in Figure 1, in Switching Power Supply of the prior art, usually fuse F is set between AC power AC and rectification unit R.When the electric current that AC power AC exports is excessive, fuse F fuses, and Switching Power Supply is disconnected from AC power AC, thus plays the effect of overcurrent protection.But for the application of Switching Power Supply, the sensitivity of fuse is too high, also can fuse under some do not need the electric current of open circuit, thus cause the work of unnecessary replacing fuse.In addition, fuse is difficult to manufacture, and price is higher, and the amount of being unfavorable for is produced.
In order to solve the problem, the present embodiment provides a kind of overcurrent protective device be made up of multiple wirewound resistor, can not fuse when not needing open circuit, can quick fuse when in needs open circuit.
Fig. 4 shows a kind of Switching Power Supply of the current protective device adopting the present embodiment to provide.This Switching Power Supply comprises: rectification unit R, is connected to AC power AC by circuit L, for alternating current is converted to direct current; Filter unit C1, for reducing the fluctuation of the voltage that rectification unit R exports; Pulse transformer T, for receiving electric energy from rectification unit R and filter unit C1, and realize the energy transferring of former avris to secondary side, wherein the former avris of pulse transformer T comprises former limit winding L p1with auxiliary winding L p2, the secondary side of pulse transformer T comprises vice-side winding L s; Control unit U, for the turn-on and turn-off of control impuls transformer T; Output unit, comprises diode D, filtering capacitor C2 and resistance R o, receive electric energy for the secondary side joint from pulse transformer T and provide voltage V to earth leakage protective device (not shown) o.
As shown in Figure 4, the current protective device that the present embodiment provides comprises wire-wound resistor R1 and wire-wound resistor R2.In the circuit L of wire-wound resistor R1 between rectification unit R and AC power AC, for providing overcurrent protection to circuit L.Wire-wound resistor R2 between rectification unit R and filter unit C1, for providing overcurrent protection to the total current after rectification.
When the electric current flow through in wirewound resistor makes the power of wirewound resistor be greater than its rated power, wirewound resistor can fuse, thus plays the effect of overcurrent protection.Compared to fuse, the sensitivity of wirewound resistor is lower, fuse can be avoided because of too high the caused problem of sensitivity, and failure rate is lower than fuse.In addition, the present embodiment have employed dual wire-wound resistor R1, R2 more protection.Even if one of them lost efficacy, another also can continue protective circuit, added reliability.
Be to be understood that, although this specification describes according to each embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.
Reference numerals list
AC power AC; Fuse F; Rectification unit R; Filter unit C1; Pulse transformer T; Former limit winding L p1; Auxiliary winding L p2; Vice-side winding L s; Control unit U; Diode D; Filtering capacitor C2; Resistance R o; Pin 1,2,3,4,5,6; Encapsulating housing 10,100; Fly line 7,8; Wire-wound resistor R1, R2

Claims (12)

1., for a pulse transformer for the Switching Power Supply in earth leakage protective device, comprising:
Encapsulating housing (100), its enclosed inside has former avris winding and secondary side winding;
Be electrically connected to multiple first electric ejectors of described former avris winding;
Be electrically connected to multiple second electric ejectors of described secondary side winding;
It is characterized in that,
Described multiple first electric ejector and/or described multiple second electric ejector are fly line (7,8).
2. pulse transformer according to claim 1, is characterized in that, described multiple first electric ejector is pin (1,2,3,4), and described multiple second electric ejector is fly line (7,8).
3. pulse transformer according to claim 1, is characterized in that, described multiple second electric ejector is pin, and described multiple first electric ejector is fly line.
4. pulse transformer according to claim 1, is characterized in that, described former avris winding comprises former limit winding (L p1) and auxiliary winding (L p2).
5. pulse transformer according to claim 1, is characterized in that, described fly line (7,8) is formed with its former avris winding be connected to or secondary side winding integratedly.
6. pulse transformer according to claim 1, is characterized in that, the wire that described fly line (7,8) has insulating barrier by surface is formed, and described fly line (7,8) one end extended to outside described encapsulating housing is exposed end.
7. pulse transformer according to claim 1, it is characterized in that, described multiple first electric ejector and described multiple second electric ejector have exposed electrical joint outside described encapsulating housing, and the minimum range between the exposed electrical joint of described multiple first electric ejector and the exposed electrical joint of described multiple second electric ejector is greater than predetermined threshold.
8. pulse transformer according to claim 7, is characterized in that, described predetermined threshold is 14mm.
9. pulse transformer according to claim 1, is characterized in that, is provided with copper foil shielding layer between described former avris winding and described secondary side winding.
10. a Switching Power Supply, is characterized in that, comprises the pulse transformer according to any one in claim 1-9.
11. Switching Power Supplies according to claim 10; comprise rectification unit (R) and filter unit (C1); it is characterized in that; described rectification unit (R) is connected to AC power by the first wire-wound resistor (R1); be connected with the second wire-wound resistor (R2) between described rectification unit (R) and described filter unit (C1), described first wire-wound resistor (R1) and the second wire-wound resistor (R2) are for providing overcurrent protection.
12. 1 kinds of earth leakage protective devices, is characterized in that, comprise the Switching Power Supply according to claim 10 or 11.
CN201310740947.1A 2013-12-26 2013-12-26 Pulse transformer, switching power supply with same and residual current device Pending CN104752031A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201310740947.1A CN104752031A (en) 2013-12-26 2013-12-26 Pulse transformer, switching power supply with same and residual current device
DE102014226963.6A DE102014226963A1 (en) 2013-12-26 2014-12-23 Pulse transformer and this comprehensive electric switch power source and residual current device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310740947.1A CN104752031A (en) 2013-12-26 2013-12-26 Pulse transformer, switching power supply with same and residual current device

Publications (1)

Publication Number Publication Date
CN104752031A true CN104752031A (en) 2015-07-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310740947.1A Pending CN104752031A (en) 2013-12-26 2013-12-26 Pulse transformer, switching power supply with same and residual current device

Country Status (2)

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CN (1) CN104752031A (en)
DE (1) DE102014226963A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090212754A1 (en) * 2008-02-21 2009-08-27 Cambridge Semiconductor Limited Noise reduction systems and methods
CN201663559U (en) * 2009-11-19 2010-12-01 衡阳风顺车桥有限公司 Automatic light-control DC power supply
CN202120726U (en) * 2011-05-30 2012-01-18 昂宝电子（上海）有限公司 Transformer
CN203288400U (en) * 2013-05-24 2013-11-13 昂宝电子（上海）有限公司 Transformer used for flyback switch power supply

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090212754A1 (en) * 2008-02-21 2009-08-27 Cambridge Semiconductor Limited Noise reduction systems and methods
CN201663559U (en) * 2009-11-19 2010-12-01 衡阳风顺车桥有限公司 Automatic light-control DC power supply
CN202120726U (en) * 2011-05-30 2012-01-18 昂宝电子（上海）有限公司 Transformer
CN203288400U (en) * 2013-05-24 2013-11-13 昂宝电子（上海）有限公司 Transformer used for flyback switch power supply

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Publication number Publication date
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Application publication date: 20150701