JP5318071B2 - Switching power supply - Google Patents

Switching power supply Download PDF

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JP5318071B2
JP5318071B2 JP2010245214A JP2010245214A JP5318071B2 JP 5318071 B2 JP5318071 B2 JP 5318071B2 JP 2010245214 A JP2010245214 A JP 2010245214A JP 2010245214 A JP2010245214 A JP 2010245214A JP 5318071 B2 JP5318071 B2 JP 5318071B2
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bus bar
winding
power supply
switching power
smoothing circuit
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JP2012100413A (en
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淳年 高田
拓人 矢野
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三菱電機株式会社
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/20Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00Converter types
    • B60L2210/10DC to DC converters
    • B60L2210/12Buck converters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00Converter types
    • B60L2210/30AC to DC converters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00Converter types
    • B60L2210/40DC to AC converters
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/2847Sheets; Strips
    • H01F2027/2861Coil formed by folding a blank
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/08Cooling; Ventilating
    • H01F27/22Cooling by heat conduction through solid or powdered fillings
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility

Description

本発明は、放熱性の高いバスバー構造を有したスイッチング電源に関するものである。   The present invention relates to a switching power supply having a bus bar structure with high heat dissipation.
従来より、直流電圧を所望の直流電圧に降下させるスイッチング電源として、直流入力電圧をスイッチング素子により矩形波パルス電圧に変換し、その変換した矩形波電圧をトランスの一次巻線に印加し、トランスの二次巻線で取り出された矩形波電圧を整流素子,チョークコイル,コンデンサなどからなる回路で整流・平滑することにより、直流電圧を得るスイッチング電源がある。中でもハイブリッド車や電気自動車などの車両に搭載されているスイッチング電源は、数百ボルトに達する高電圧バッテリの電圧を、従来車の電源系電圧として採用されている14Vに降圧し、多くの電気負荷や鉛バッテリに電力を供給している。14V系に接続された電気負荷は百数十Aに達するため、トランスからの発熱が大きく、またトランスで降圧することによって二次側回路に大電流が流れるため、整流素子での発熱量が大きくなる。このため、トランス及び整流素子で発生する熱の放熱性向上、及び複数の放熱経路確保が重要な技術となる。   Conventionally, as a switching power supply for dropping a DC voltage to a desired DC voltage, a DC input voltage is converted into a rectangular pulse voltage by a switching element, and the converted rectangular wave voltage is applied to the primary winding of the transformer. There is a switching power supply that obtains a DC voltage by rectifying and smoothing a rectangular wave voltage extracted by a secondary winding with a circuit including a rectifier element, a choke coil, a capacitor, and the like. In particular, switching power supplies mounted on vehicles such as hybrid vehicles and electric vehicles step down the voltage of high-voltage batteries, which reaches several hundred volts, to 14V, which is used as the power system voltage of conventional vehicles, and many electric loads. Power is supplied to the lead battery. Since the electrical load connected to the 14V system reaches hundreds of amperes, heat generation from the transformer is large, and a large current flows through the secondary circuit by stepping down with the transformer, so the heat generation amount at the rectifying element is large. Become. For this reason, it is important to improve the heat dissipation of heat generated by the transformer and the rectifying element and to secure a plurality of heat dissipation paths.
このような課題を解決するための一手段として、トランスの二次側コイルを構成するバスバー(以下、二次巻線用バスバー)に放熱用足部を設け、放熱用足部−金属筐体間に設けた絶縁シートを介して金属筐体に放熱する技術があった(特許文献1)。   As one means for solving such problems, a heat dissipating foot is provided on a bus bar constituting the secondary coil of the transformer (hereinafter referred to as a secondary winding bus bar), and between the heat dissipating foot and the metal housing. There has been a technique of radiating heat to a metal casing through an insulating sheet provided on the substrate (Patent Document 1).
特開2004−303823号公報JP 2004-303823 A
しかしながら、特許文献1に記載のスイッチング電源は、二次巻線用バスバーに設けられる放熱用足部と他の電気部品を接続する外部接続端子を、コアが貫通する孔部を挟んで配置する手法であるため、この手法にのみ基づいて設計を行うと、二次巻線用バスバーを金属板(導電板)から切り出す際に、金属板の捨て代が多くなってしまう場合がある。また、トランスで発生する熱を放熱する目的だけであれば、二次巻線用バスバーに設けた放熱用足部で放熱性を確保できるが、トランスと整流素子が近接して配置されている場合、整流素子で発生した大量の熱が二次巻線用バスバーに伝達され、二次巻線用バスバーの放熱用足部から放熱され、加えて整流素子から整流素子直下へも放熱されるため、トランス及び整流素子の直下に熱が集中してしまうという問題点がある。   However, the switching power supply described in Patent Document 1 is a method in which an external connection terminal that connects a heat-dissipating foot provided on a bus bar for secondary winding and another electrical component is disposed across a hole through which the core passes. Therefore, if the design is performed based only on this method, when the bus bar for secondary winding is cut out from the metal plate (conductive plate), there is a case where the metal plate has to be discarded. If the purpose is to dissipate the heat generated by the transformer, heat dissipation can be ensured by the heat dissipating feet provided on the bus bar for secondary winding, but the transformer and rectifying element are placed close to each other. Because a large amount of heat generated in the rectifying element is transmitted to the bus bar for the secondary winding, radiated from the heat radiation foot of the bus bar for the secondary winding, and also radiated from the rectifying element directly under the rectifying element, There is a problem that heat concentrates directly under the transformer and the rectifying element.
このため、トランス直下へ放熱するために設けられた放熱用足部だけでは、放熱経路の確保が不十分となる。このため、課題解決のためには、トランス及び整流素子近辺以外への放熱経路の確保が必要となるが、特許文献1に記載のスイッチング電源においては、二次巻線用バスバーと平滑回路用バスバーが別部材であるためネジ接続となり、十分な放熱性を確保できているとは言えない。また、二次巻線用バスバーと平滑回路用バスバーが別部材で構成されるため、部品点数及びネジ点数が多く、組立性が悪い。   For this reason, the securing of the heat radiation path is insufficient with only the heat radiation foot provided to radiate heat directly under the transformer. For this reason, in order to solve the problem, it is necessary to secure a heat dissipation path other than the vicinity of the transformer and the rectifying element. However, in the switching power supply described in Patent Document 1, the secondary winding bus bar and the smoothing circuit bus bar are used. Since it is a separate member, it is a screw connection and it cannot be said that sufficient heat dissipation is ensured. Further, since the secondary winding bus bar and the smoothing circuit bus bar are formed of separate members, the number of parts and the number of screws are large, and the assemblability is poor.
本発明はこのような課題を解決するためになされたもので、大電流が流れるトランス及び整流回路で発生した熱を効率よく放熱させることが可能であり、かつ部品点数の削減を実現するスイッチング電源を提供することを目的とする。   The present invention has been made to solve such a problem, and can efficiently dissipate heat generated in a transformer and a rectifier circuit through which a large current flows, and realize a reduction in the number of components. The purpose is to provide.
本発明に係わるスイッチング電源は、一次巻線の両端に印加される交流電圧を二次巻線から異なる交流電圧に変換して出力するトランスと、前記二次巻線から出力される交流電圧を整流する整流回路と、前記整流回路で得られたリップル電圧波形を平滑する平滑回路と、前記平滑回路で得られた直流電圧を外部に出力する出力端子とを備えるスイッチング電源において、前記トランスの二次巻線はセンタータップにより電気的に分割されるセンタータップ式トランスの第1と第2二次巻線を有すると共に、前記スイッチング電源には、本体を金属筺体へ設置固定するための固定兼放熱用足部を備え、前記トランスの第1と第2二次巻線を構成する二次巻線用バスバー前記平滑回路の配線を構成する平滑回路用バスバー及び前記固定兼放熱用足部が、同一の導電板から一体に切り出された形成体で構成されているものである。 The switching power supply according to the present invention includes a transformer that converts an AC voltage applied to both ends of a primary winding from a secondary winding to a different AC voltage and outputs the transformer, and rectifies the AC voltage output from the secondary winding. a rectifier circuit which includes a smoothing circuit for smoothing the ripple voltage waveform obtained by the rectifier circuit, the switching power supply and an output terminal for outputting a DC voltage obtained by the smoothing circuit to the outside, the secondary of the transformer The winding has first and second secondary windings of a center tap transformer that is electrically divided by a center tap, and the switching power supply has fixing and heat dissipation for fixing the main body to a metal housing. includes a foot, said first secondary winding busbar composing the second secondary winding of the transformer, the smoothing circuit smoothing circuit busbar and the fixed and thermally radiative forming the interconnection of the Part is one which is constituted by forming body cut out integrally from the same conductive plate.
また、本発明に係わるスイッチング電源は、前記形成体が平板状導電板から切り出され、折り曲げられた形成体である。   The switching power supply according to the present invention is a formed body in which the formed body is cut out from a flat conductive plate and bent.
本発明のスイッチング電源によれば、トランスの二次巻線はセンタータップにより電気的に分割されるセンタータップ式トランスの第1と第2二次巻線を有すると共に、スイッチング電源には、本体を金属筺体へ設置固定するための固定兼放熱用足部を備え、トランスの第1と第2二次巻線を構成する二次巻線用バスバー、平滑回路の配線を構成する平滑回路用バスバー及び固定兼放熱用足部が、同一の導電板から一体に切り出された形成体で構成されているので、整流素子が接続され、センタータップ式トランスの第1と第2二次巻線を構成する二次巻線用バスバー側から平滑回路用バスバー側への熱伝導性向上及び放熱経路確保を実現することができ、効率よく放熱することができ、さらに、部品点数の削減を実現できる。 According to the switching power supply of the present invention, the secondary winding of the transformer has the first and second secondary windings of the center tap type transformer that is electrically divided by the center tap. A bus bar for secondary winding that constitutes the first and second secondary windings of the transformer, a bus bar for smoothing circuit that constitutes the wiring of the smoothing circuit, provided with fixing and heat dissipating feet for installation and fixing to the metal housing, and Since the fixed and heat radiating foot is formed of a formed body cut out integrally from the same conductive plate, the rectifying element is connected to form the first and second secondary windings of the center tap transformer. It is possible to improve the thermal conductivity and secure the heat dissipation path from the secondary winding bus bar side to the smoothing circuit bus bar side, to efficiently dissipate heat, and to reduce the number of components.
また、本発明のスイッチング電源によれば、前記形成体が平板状導電板から切り出され、折り曲げられた形成体であるので、センタータップ式トランスの二次巻線用バスバーを、同一の導電板から一体に切り出すことができ、生産性を向上させることができる。あるいは、平滑回路用バスバーの複数個を同一の導電板から一体に切り出すことができ、インダクタのターン数を複数にすることが容易にできる。   Further, according to the switching power supply of the present invention, since the formed body is a formed body cut out and bent from the flat conductive plate, the bus bar for the secondary winding of the center tap transformer is formed from the same conductive plate. It can cut out integrally and can improve productivity. Alternatively, a plurality of smoothing circuit bus bars can be cut out integrally from the same conductive plate, and the number of turns of the inductor can be easily increased.
本発明が適用できるスイッチイグ電源の回路構成を示す回路図である。It is a circuit diagram which shows the circuit structure of the switch ignition power supply which can apply this invention. 本発明の実施の形態1における、導電板から切り出されるバスバーのレイアウトを示す平面図である。It is a top view which shows the layout of the bus-bar cut out from the electrically conductive board in Embodiment 1 of this invention. 実施の形態1における、同一の導電板から一体に切り出されて製作されたバスバー初期形成体を示す平面図である。FIG. 3 is a plan view showing a bus bar initial formed body that is manufactured by being integrally cut from the same conductive plate in the first embodiment. 実施の形態1における、折り曲げられて製作されたバスバー中間形成体を示す平面図である。3 is a plan view showing a bus bar intermediate formed body produced by being bent in Embodiment 1. FIG. 実施の形態1における、折り曲げられて製作されたバスバー最終形成体を示す平面図である。FIG. 3 is a plan view showing a bus bar final formed body manufactured by being bent in the first embodiment. 実施の形態1における、バスバー最終形成体を使用したスイッチング電源を示す平面図である。FIG. 3 is a plan view showing a switching power supply using a bus bar final formed body in the first embodiment. 図6のA−A線断面を示す断面図である。It is sectional drawing which shows the AA line cross section of FIG. 図6のB−B線断面を示す断面図である。It is sectional drawing which shows the BB line cross section of FIG. 本発明が適用できるスイッチイグ電源の他の回路構成を示す回路図である。It is a circuit diagram which shows the other circuit structure of the switch ignition power supply which can apply this invention.
実施の形態1.
本発明を説明するために、絶縁型スイッチング電源の一般的な回路方式であるセンタータップ式ダイオード整流方式を例に挙げる。センタータップ式ダイオード整流方式は一般的な全波整流回路と同等の整流波形を得ることができる整流回路の一種である。センタータップ式ダイオード整流方式の回路図を図1に示す。図1は本発明が適用できるスイッチイグ電源の回路構成を示す回路図である。入力端子1a,1bには、スイッチング電源への直流電圧が印加される。この直流電圧はスイッチング電源の出力電圧よりも高い電圧が印加される。インバータ回路2は、MOSFETなどの半導体素子で構成され、入力端子1a,1bに入力された直流電圧を交流電圧に変換する。
Embodiment 1 FIG.
In order to explain the present invention, a center tap type diode rectification method, which is a general circuit method of an insulating switching power supply, is taken as an example. The center tap type diode rectification method is a kind of rectification circuit that can obtain a rectification waveform equivalent to a general full-wave rectification circuit. A circuit diagram of the center tap type diode rectification method is shown in FIG. FIG. 1 is a circuit diagram showing a circuit configuration of a switching power supply to which the present invention can be applied. A DC voltage to the switching power supply is applied to the input terminals 1a and 1b. The DC voltage is higher than the output voltage of the switching power supply. The inverter circuit 2 is composed of a semiconductor element such as a MOSFET, and converts a DC voltage input to the input terminals 1a and 1b into an AC voltage.
トランス12は磁性体コア4,一次巻線3,上側二次巻線5及び下側二次巻線6で構成される。一次巻線3,上側二次巻線5及び下側二次巻線6が、磁性体コア4に設けられた中足(軸芯部)に巻回されて配置され、一次巻線3,上側二次巻線5,及び下側二次巻線6が磁性体コア4で電磁気的に結合される。一次巻線3には、インバータ回路2の半導体素子をスイッチングすることによって生成される矩形波に近い交流電圧波形が印加される。上側二次巻線5には、トランス12の巻き数比に応じて異なる電圧レベルに変換された交流電圧が出力される。下側二次巻線6には、トランス12の巻き数比に応じて異なる電圧レベルに変換された交流電圧が出力される。上側二次巻線5と下側二次巻線6は接続されている。   The transformer 12 includes a magnetic core 4, a primary winding 3, an upper secondary winding 5, and a lower secondary winding 6. The primary winding 3, the upper secondary winding 5, and the lower secondary winding 6 are arranged by being wound around a middle leg (shaft core portion) provided on the magnetic core 4. The secondary winding 5 and the lower secondary winding 6 are electromagnetically coupled by the magnetic core 4. An alternating voltage waveform close to a rectangular wave generated by switching the semiconductor element of the inverter circuit 2 is applied to the primary winding 3. The upper secondary winding 5 outputs an AC voltage converted to a different voltage level according to the turn ratio of the transformer 12. The lower secondary winding 6 outputs an AC voltage converted to a different voltage level according to the turns ratio of the transformer 12. The upper secondary winding 5 and the lower secondary winding 6 are connected.
整流素子7a,7bは、上側二次巻線5、下側二次巻線6から出力される交流電圧を整流する。図1の例では、各整流素子7a,7bのアノード端子が金属筐体に接続されるダイオードモジュールとしている。8は、スイッチング電源の金属筐体に接続されたグランド端子である。図1の例では、二次側回路のグランドとして、金属筐体を用いている。インダクタ9は整流素子7a,7bで整流したリップル電圧波形を平滑する。コンデンサ10は整流素子7a,7bで整流したリップル電圧波形を平滑する。インダクタ9とコンデンサ10で平滑回路を構成する。出力端子11より平滑回路で得られた直流電圧がスイッチング電源の外部へ出力される。なお、図1の例では、二次側回路のグランドを金属筐体と同電位にしているため、出力電圧は出力端子11と金属筐体の間に出力される。   The rectifying elements 7 a and 7 b rectify the AC voltage output from the upper secondary winding 5 and the lower secondary winding 6. In the example of FIG. 1, a diode module in which the anode terminals of the rectifying elements 7a and 7b are connected to a metal casing is used. Reference numeral 8 denotes a ground terminal connected to the metal casing of the switching power supply. In the example of FIG. 1, a metal casing is used as the ground of the secondary circuit. The inductor 9 smoothes the ripple voltage waveform rectified by the rectifying elements 7a and 7b. The capacitor 10 smoothes the ripple voltage waveform rectified by the rectifying elements 7a and 7b. The inductor 9 and the capacitor 10 constitute a smoothing circuit. A DC voltage obtained by the smoothing circuit is output from the output terminal 11 to the outside of the switching power supply. In the example of FIG. 1, since the ground of the secondary side circuit is set to the same potential as the metal casing, the output voltage is output between the output terminal 11 and the metal casing.
図2は実施の形態1における、一枚の矩形導電板(金属板)から切り出されるバスバーのレイアウトを示す平面図である。図2には、二次巻線用バスバー,平滑回路用バスバー,出力端子接続用バスバー,出力端子,固定兼放熱用足部,及び固定足が含まれ一体に配置されている。レイアウトに従って、バスバーが、一枚の同一の導電板から一体に切り出され、バスバー初期形成体が製作される。切り出されたバスバー初期形成体17を図3に示す。   FIG. 2 is a plan view showing a layout of bus bars cut out from one rectangular conductive plate (metal plate) in the first embodiment. FIG. 2 includes a secondary winding bus bar, a smoothing circuit bus bar, an output terminal connection bus bar, an output terminal, a fixing and heat dissipation foot, and a fixing foot, which are integrally arranged. According to the layout, the bus bar is cut out integrally from the same conductive plate, and the bus bar initial formed body is manufactured. The bus bar initial formed body 17 cut out is shown in FIG.
切り出されたバスバー初期形成体17において、二次巻線用バスバー21は、(図1の)回路図のセンタータップ式トランス12の上側二次巻線5に該当し、バスバーの1ターンで構成されている。二次巻線用バスバー21と一体に形成されたバスバー端子25a(図2では、その位置を破線枠で示す。以下同様である。)は、回路図の整流素子7aに該当するダイオードモジュールのカソード端子に接続される。二次巻線用バスバー22は、回路図のセンタータップ式トランス12の下側二次巻線6に該当し、バスバーの1ターンで構成されている。二次巻線用バスバー22と一体に形成されたバスバー端子25bは、回路図の整流素子7bに該当するダイオードモジュールのカソード端子に接続される。   In the bus bar initial forming body 17 that is cut out, the secondary winding bus bar 21 corresponds to the upper secondary winding 5 of the center tap transformer 12 in the circuit diagram (of FIG. 1), and is constituted by one turn of the bus bar. ing. The bus bar terminal 25a formed integrally with the secondary winding bus bar 21 (in FIG. 2, the position thereof is indicated by a broken line frame, the same applies hereinafter) is the cathode of the diode module corresponding to the rectifying element 7a in the circuit diagram. Connected to the terminal. The secondary winding bus bar 22 corresponds to the lower secondary winding 6 of the center tap transformer 12 in the circuit diagram, and is constituted by one turn of the bus bar. The bus bar terminal 25b formed integrally with the secondary winding bus bar 22 is connected to the cathode terminal of the diode module corresponding to the rectifying element 7b in the circuit diagram.
バスバー初期形成体17は、曲げ部23a,23bで、90°ずつ折り曲げて、二次巻線用バスバー22を二次巻線用バスバー21の裏側に、紙面に垂直投影的に一致させて重ね、回路図のセンタータップ式トランス12の二次巻線5,6を構成する。図4は、曲げ部23a,23bで折り曲げて、重ね合わせて製作されたバスバー中間形成体18を示す。24a,24bは貫通孔で、トランス12の磁性体コア4の中足(軸心部)が貫通する。   The bus bar initial forming body 17 is bent by 90 ° at the bent portions 23a and 23b, and the secondary winding bus bar 22 is superimposed on the back side of the secondary winding bus bar 21 so as to coincide with the paper surface in a vertical projection manner. The secondary windings 5 and 6 of the center tap type transformer 12 in the circuit diagram are configured. FIG. 4 shows the bus bar intermediate formed body 18 produced by bending and bending the bent portions 23a and 23b. Reference numerals 24a and 24b denote through-holes through which the middle legs (axial centers) of the magnetic core 4 of the transformer 12 pass.
図3,図4において、平滑回路用バスバー26,27は、両方を合わせて回路図のインダクタ9に該当し、バスバーの2ターンで平滑用チョークコイルの巻線を構成する。図4において、バスバー中間形成体18は、曲げ部28a,28bで、90°ずつ折り曲げて、平滑回路用バスバー27を平滑回路用バスバー26の表側に、紙面に垂直投影的に一致させて重ね、回路図のインダクタ9を構成する。図5は、曲げ部28a,28bで折り曲げて、重ね合わせて製作されたバスバー最終形成体19を示す。29a,29bは貫通孔で、平滑用チョークコイルの構成要素である磁性体コア44(図6)の中足(軸心部)が貫通する。   3 and 4, the smoothing circuit bus bars 26 and 27 together correspond to the inductor 9 in the circuit diagram, and the winding of the smoothing choke coil is constituted by two turns of the bus bar. In FIG. 4, the bus bar intermediate formed body 18 is bent by 90 ° at the bent portions 28a and 28b, and the smoothing circuit bus bar 27 is superimposed on the front side of the smoothing circuit bus bar 26 so as to coincide with the paper surface in a vertical projection manner. The inductor 9 in the circuit diagram is configured. FIG. 5 shows the bus bar final formed body 19 that is manufactured by being bent and bent at the bent portions 28a and 28b. Reference numerals 29a and 29b denote through-holes through which the middle legs (axial centers) of the magnetic core 44 (FIG. 6), which is a component of the smoothing choke coil, pass.
バスバー形成体は、同一の導電板から一体に切り出すが、必ずしも曲げ加工する必要はない。すなわち、二次巻線用バスバー21,平滑回路用バスバー27とその接続用バスバーであれば、曲げ加工する必要はない。しかし、バスバー初期形成体17を曲げ部23a,23bで曲げ加工して、バスバー中間形成体18を得、さらに、曲げ部28b,28aで曲げ加工して、バスバー最終形成体19を得るようにすると、センタータップ式トランスの二次巻線用バスバー21,22を、同一の導電板から一体に切り出すことができ、生産性を向上させることができる。さらに、平滑回路用バスバー26,27の複数個を同一の導電板から一体に切り出すことができ、インダクタ9のターン数を複数にすることが容易にできる。   The bus bar forming body is cut out integrally from the same conductive plate, but is not necessarily bent. That is, if the bus bar for secondary winding 21, the bus bar for smoothing circuit 27, and the bus bar for connecting the bus bar are not required to be bent. However, when the bus bar initial formed body 17 is bent at the bent portions 23a and 23b to obtain the bus bar intermediate formed body 18, and further bent at the bent portions 28b and 28a, the bus bar final formed body 19 is obtained. The bus bars 21 and 22 for the secondary winding of the center tap transformer can be cut out integrally from the same conductive plate, and the productivity can be improved. Further, a plurality of smoothing circuit bus bars 26 and 27 can be cut out integrally from the same conductive plate, and the number of turns of the inductor 9 can be easily made plural.
図5において、30は出力端子で、平滑回路で得られた直流電圧をスイッチング電源の外部に出力する。31は出力端子接続用バスバーで、平滑回路用バスバー27と出力端子30を接続する。図2において、32は切れ目のない一枚の導電板で、例えば、銅又はアルミニューム製である。導電板32の大きさは、実施の形態1では、二次巻線用バスバー21、二次巻線用バスバー22、出力端子接続用バスバー31の出力端子30にそれぞれ外接する矩形である。固定兼放熱用足部33a〜33dは前記矩形導電板32内に配置され、導電板32から一体に切り出されて形成される。固定兼放熱用足部33a〜33dは前記矩形導電板32内に配置されるため、導電板の捨て代を低減することができる。固定兼放熱用足部33a,33bは、それぞれ二次巻線用バスバー21,22のバスバー端子25a,25b(整流素子7a,7b接続用端子)側、つまり、整流素子の近傍に設けられている。これにより、整流素子7a,7bで発生しる大量の熱を効率よく放熱できる。   In FIG. 5, 30 is an output terminal, which outputs the DC voltage obtained by the smoothing circuit to the outside of the switching power supply. An output terminal connection bus bar 31 connects the smoothing circuit bus bar 27 and the output terminal 30. In FIG. 2, reference numeral 32 denotes an unbroken conductive plate made of, for example, copper or aluminum. In the first embodiment, the size of the conductive plate 32 is a rectangle circumscribing the output terminal 30 of the secondary winding bus bar 21, the secondary winding bus bar 22, and the output terminal connection bus bar 31. The fixing / radiating legs 33a to 33d are disposed in the rectangular conductive plate 32, and are formed by being cut out integrally from the conductive plate 32. Since the fixing and heat radiating feet 33a to 33d are arranged in the rectangular conductive plate 32, it is possible to reduce the disposal cost of the conductive plate. The fixing / radiating feet 33a and 33b are provided on the bus bar terminals 25a and 25b (rectifying element 7a and 7b connecting terminals) side of the secondary winding bus bars 21 and 22, respectively, that is, in the vicinity of the rectifying element. . Thereby, a large amount of heat generated in the rectifying elements 7a and 7b can be efficiently radiated.
固定兼放熱用足部33cは、二次巻線用バスバー22と平滑回路用バスバー26の間に設けられている。これにより、放熱性の向上を実現できる。固定兼放熱用足部33dは、平滑回路用バスバー27の出力端子30側に設けられている。これにより、放熱性の向上を実現できる。固定兼放熱用足部33a〜33dの金属筺体48(図7,図8)への固定において、その間の絶縁を確保するため、放熱性と絶縁性の両方を備えたシート49(図8)をそれぞれ介在させる。34a〜34dは固定機能を果たす固定足で、実施の形態1のように、図5のバスバー最終形成体19に示すように折りたたんだときに、固定足34aと34b、固定足34dと34cを同一のネジ50(図8)で固定可能な構造とすることで、ネジ点数を削減し、組立性を向上させることができる。   The fixed and heat radiating foot 33c is provided between the secondary winding bus bar 22 and the smoothing circuit bus bar 26. Thereby, the improvement of heat dissipation is realizable. The fixing / radiating foot 33 d is provided on the output circuit 30 side of the smoothing circuit bus bar 27. Thereby, the improvement of heat dissipation is realizable. In securing the fixing and heat dissipating feet 33a to 33d to the metal housing 48 (FIGS. 7 and 8), a sheet 49 (FIG. 8) having both heat dissipation and insulation is secured in order to ensure insulation therebetween. Interpose each. Reference numerals 34a to 34d denote fixing legs that perform a fixing function. When folded as shown in the bus bar final formed body 19 in FIG. 5 as in the first embodiment, the fixing legs 34a and 34b and the fixing legs 34d and 34c are the same. By adopting a structure that can be fixed with the screw 50 (FIG. 8), the number of screws can be reduced and the assemblability can be improved.
図2〜図5に示すように、二次巻線用バスバー,平滑回路用バスバー,出力端子接続用バスバー,及び出力端子が含まれ、同一の導電板から一体に切り出された形成体は、整流素子と接続し近傍に整流素子を有する二次巻線用バスバー側から、平滑回路用バスバー側への熱伝導性向上及び放熱経路確保を実現することができ、部品点数の削減、組立性の向上を実現できる。また、固定兼放熱用足部が共に同一の導電板から一体に切り出された形成体においても、前記と同様な効果が実現できる。   As shown in FIG. 2 to FIG. 5, a secondary winding bus bar, a smoothing circuit bus bar, an output terminal connection bus bar, and an output terminal are included, and the formed body integrally cut from the same conductive plate is rectified. Improves thermal conductivity and secures a heat dissipation path from the secondary winding busbar side, which has a rectifying element connected to the element, to the smoothing circuit busbar side, reducing the number of components and improving assembly Can be realized. Further, the same effect as described above can be realized even in the formed body in which both the fixing and heat dissipating feet are integrally cut from the same conductive plate.
なお、実施の形態1では、二次巻線用バスバー21,22、平滑回路用バスバー26,27、出力端子30、及び出力端子接続用バスバー31を、同一の導電板から一体に切り出された形成体で構成しているが、図2において、右側二次側巻線用バスバー22と、左側平滑回路用バスバー26のみを一体化しても、前記と同様な効果を実現できる。さらに、平滑回路用バスバー26,27が存在するか否かにかかわらず、少なくとも、二次巻線用バスバーと出力端子を有する出力端子接続用バスバーを同一の導電板から一体に切り出された形成体で構成してもよく、整流素子と接続し、近傍に整流素子を有する二次巻線用バスバー側から、出力端子接続用バスバー側への熱伝導性向上及び放熱経路確保を実現することができ、部品点数の削減、組立性の向上を実現できる。   In the first embodiment, the secondary winding bus bars 21 and 22, the smoothing circuit bus bars 26 and 27, the output terminal 30, and the output terminal connection bus bar 31 are integrally cut from the same conductive plate. In FIG. 2, even if only the right secondary winding bus bar 22 and the left smoothing circuit bus bar 26 are integrated, the same effect as described above can be realized. Further, regardless of whether or not the smoothing circuit bus bars 26 and 27 are present, a formed body obtained by integrally cutting at least the secondary winding bus bar and the output terminal connecting bus bar having the output terminal from the same conductive plate. It is possible to realize the improvement of thermal conductivity and the securing of the heat dissipation path from the secondary winding bus bar side connected to the rectifying element and having the rectifying element in the vicinity to the output terminal connecting bus bar side. It is possible to reduce the number of parts and improve assembly.
図6は実施の形態1における、バスバー最終形成体19を使用して組み立てたスイッチング電源を示す平面図である。図7は図6のA−A線断面を示す断面図である。図8は図6のB−B線断面を示す断面図である。バスバー初期形成体17(図3)に曲げ加工を施してバスバー中間形成体18(図4)を構成し、さらに曲げ加工を施してバスバー最終形成体19(図5)を構成する。バスバー最終形成体19に磁性体コア42,44、整流素子43、平滑コンデンサ45を組み合わせることでスイッチング電源の二次側回路を構成する。 FIG. 6 is a plan view showing the switching power source assembled using the bus bar final formed body 19 in the first embodiment. 7 is a cross-sectional view showing a cross section taken along line AA of FIG. 8 is a cross-sectional view showing a cross section taken along line BB of FIG. The bus bar initial formed body 17 (FIG. 3) is bent to form the bus bar intermediate formed body 18 (FIG. 4), and further bent to form the bus bar final formed body 19 (FIG. 5). A secondary circuit of the switching power supply is configured by combining the magnetic cores 42 and 44, the rectifying element 43, and the smoothing capacitor 45 with the bus bar final formed body 19.
図6,図7,図8において、一次側巻線41は、(図1の)回路図のトランス12の一次巻線3に該当する。一次側巻線41は電線を中央に貫通孔41c(図7)を有するように巻いて円環状平板状に構成したコイル41dで端子41a,41bを有している。その円環状平板コイル41dの内径と外径は、二次側巻線用バスバー21,22のそれとほぼ同じである。円環状平板コイル41dである一次側巻線41を、バスバー最終形成体19において、曲げ加工された二次側巻線用バスバー21,22間に介在させ、一次側巻線41の貫通孔41cと二次側巻線用バスバー21,22の貫通孔24a,24bとを一致させて配置する。   6, 7 and 8, the primary winding 41 corresponds to the primary winding 3 of the transformer 12 in the circuit diagram (of FIG. 1). The primary side winding 41 has terminals 41a and 41b of a coil 41d formed by winding an electric wire so as to have a through hole 41c (FIG. 7) in the center and having an annular flat plate shape. The inner and outer diameters of the annular flat plate coil 41d are substantially the same as those of the secondary winding bus bars 21 and 22. The primary winding 41, which is an annular flat plate coil 41d, is interposed between the bent secondary winding bus bars 21 and 22 in the bus bar final formed body 19, and the through hole 41c of the primary winding 41 and The through-holes 24a and 24b of the secondary winding bus bars 21 and 22 are arranged to coincide with each other.
磁性体コア42は、トランス12の磁性体コア4に該当し、両端の外脚部とその内側中央に円柱状の中足(軸心部)42aを有する。中足(軸心部)42aは二次側巻線用バスバー21,22の貫通孔24a,24bと一次側巻線41の貫通孔41cを貫通している。整流素子43は、回路図の整流素子7a,7bに該当し、トランス12の二次巻線5,6で得られる交流電圧を整流する。整流素子7a,7bには、二次側巻線用バスバー21のバスバー端子25aと二次側巻線用バスバー22のバスバー端子25bが、それぞれ接続される。整流素子43は、そのアノード端子が金属筐体に電気的に接続される構造(図1で示す)となったダイオードモジュールである。図7,図8で51は絶縁物である。   The magnetic core 42 corresponds to the magnetic core 4 of the transformer 12, and has outer leg portions at both ends and cylindrical middle legs (axial center portions) 42a at the inner center thereof. The middle leg (axial center portion) 42 a passes through the through holes 24 a and 24 b of the secondary side winding bus bars 21 and 22 and the through hole 41 c of the primary side winding 41. The rectifying element 43 corresponds to the rectifying elements 7 a and 7 b in the circuit diagram, and rectifies the AC voltage obtained by the secondary windings 5 and 6 of the transformer 12. A bus bar terminal 25a of the secondary winding bus bar 21 and a bus bar terminal 25b of the secondary winding bus bar 22 are connected to the rectifying elements 7a and 7b, respectively. The rectifying element 43 is a diode module having a structure (shown in FIG. 1) in which its anode terminal is electrically connected to a metal casing. 7 and 8, 51 is an insulator.
磁性体コア44は、平滑回路用のチョークコイルを構成し、両端の外脚部とその内側中央に円柱状の中足(軸心部)を有する。中足(軸心部)は平滑回路用バスバー26,27の貫通孔29a,29bを貫通している。平滑コンデンサ45は、回路図のコンデンサ10に該当し、その端子46はチョークコイルの出力端と接続される。端子47は平滑コンデンサ45を二次側回路のグランド、すなわち金属筐体に電気的に接続する。出力端子30は平滑回路で得られた直流電圧を、スイッチング電源の外部に出力する。33a〜33dは前述の説明に加えて、トランス、チョークコイルなどの磁性部品を金属筐体に固定する固定足と、二次側回路で発生した熱を金属筐体へ放熱する放熱用足部を兼ねている。34a〜34dは前述の説明に加えて、トランス、チョークコイルなどの磁性部品を固定する固定足である。曲げ加工したバスバー最終形成体では、固定足34a,34bと固定足34d、34cのように、同一のネジで固定可能な構造とすることで、ネジ点数を削減し、組立性を向上させることができる。   The magnetic core 44 constitutes a choke coil for a smoothing circuit, and has outer leg portions at both ends and a cylindrical middle leg (axial center portion) at the inner center. The middle leg (axial center) passes through the through holes 29a, 29b of the smooth circuit bus bars 26, 27. The smoothing capacitor 45 corresponds to the capacitor 10 in the circuit diagram, and its terminal 46 is connected to the output terminal of the choke coil. The terminal 47 electrically connects the smoothing capacitor 45 to the ground of the secondary circuit, that is, the metal casing. The output terminal 30 outputs the DC voltage obtained by the smoothing circuit to the outside of the switching power supply. In addition to the above description, 33a to 33d include a fixed foot for fixing a magnetic component such as a transformer and a choke coil to the metal housing, and a heat radiation foot for radiating heat generated in the secondary circuit to the metal housing. Also serves as. Reference numerals 34a to 34d denote fixing feet for fixing magnetic parts such as a transformer and a choke coil in addition to the above description. In the bent bus bar final formed body, it is possible to reduce the number of screws and improve the assemblability by adopting a structure that can be fixed with the same screw as the fixed feet 34a and 34b and the fixed feet 34d and 34c. it can.
以上のように、整流素子が接続される二次巻線用バスバー側から、平滑回路用バスバー及び出力端子接続用バスバー側への熱伝導性向上及び放熱経路確保を実現することができ、熱を効率よく金属筐体側に放熱することができる。また、整流素子と接続し、近傍に整流素子を有する二次巻線用バスバーであっても、二次巻線用バスバーの放熱用足部による放熱と、整流素子の整流素子直下への放熱に加え、平滑回路用バスバー及び出力端子接続用バスバー側への放熱経路があるため、効率よく放熱することができ、トランスと整流素子直下への熱の集中を防ぐことができる。さらに、放熱機能を備えた固定足の位置を工夫することで、放熱性向上を実現しつつ、金属板の捨て代を低減することができる。さらに、同一の導電板から一体に切り出された形成体で構成されるので、部品点数の削減、ネジ点数の削減、及び組立性の向上を実現することができる。なお、実施の形態1では、センタータップ式ダイオード整流方式を例に上げたが、その限りでなく、例えば、図9に示すカレントダブラ整流方式のような他の整流方式であってもよい。なお、図中同一符号は同一または相当部分を示し、9a,9bはインダクタである。   As described above, it is possible to improve the thermal conductivity and secure the heat dissipation path from the secondary winding bus bar side to which the rectifying element is connected to the smoothing circuit bus bar and the output terminal connecting bus bar side, and to generate heat. Heat can be efficiently radiated to the metal housing side. In addition, even for a secondary winding bus bar that is connected to a rectifying element and has a rectifying element in the vicinity, heat dissipation by the heat dissipation foot of the secondary winding bus bar and heat dissipation immediately below the rectifying element of the rectifying element In addition, since there is a heat radiation path to the smoothing circuit bus bar and the output terminal connection bus bar side, heat can be radiated efficiently, and concentration of heat directly under the transformer and the rectifying element can be prevented. Furthermore, by devising the position of the fixed foot provided with a heat dissipation function, it is possible to reduce the metal plate disposal while realizing improved heat dissipation. Furthermore, since it is formed of a formed body that is integrally cut from the same conductive plate, it is possible to achieve a reduction in the number of parts, a reduction in the number of screws, and an improvement in assembly. In the first embodiment, the center tap diode rectification method is taken as an example. However, the present invention is not limited to this, and other rectification methods such as a current doubler rectification method shown in FIG. 9 may be used. In the figure, the same reference numerals indicate the same or corresponding parts, and 9a and 9b are inductors.
1a,1b 入力端子 2 インバータ回路
3 一次巻線 4 磁性体コア
5,6 二次巻線 7a,7b 整流素子
8 グランド端子 9,9a,9b インダクタ
10 コンデンサ 11 出力端子
12 トランス
1a, 1b Input terminal 2 Inverter circuit 3 Primary winding 4 Magnetic cores 5, 6 Secondary winding 7a, 7b Rectifier 8 Ground terminal 9, 9a, 9b Inductor 10 Capacitor 11 Output terminal 12 Transformer
17 バスバー初期形成体 18 バスバー中間形成体
19 バスバー最終形成体
21,22 二次巻線用バスバー 23a,23b 曲げ部
24a,24b 貫通孔 25a,25b バスバー端子
26,27 平滑回路用バスバー 28a,28b 曲げ部
29a,29b 貫通孔 30 出力端子
31 出力端子接続用バスバー 32 導電板
33a,33b,33c,33d 固定兼放熱用足部
34a,34b,34c,34d 固定足
17 Bus bar initial formed body 18 Bus bar intermediate formed body 19 Bus bar final formed body 21, 22 Bus bar for secondary winding 23a, 23b Bending portion 24a, 24b Through hole 25a, 25b Bus bar terminal 26, 27 Smoothing circuit bus bar 28a, 28b Bending Portions 29a, 29b Through-hole 30 Output terminal 31 Output terminal connection bus bar 32 Conductive plates 33a, 33b, 33c, 33d Fixing and heat dissipation feet 34a, 34b, 34c, 34d Fixing feet
41 一次巻線 41a,41b 端子
41c 貫通孔 41d 円環状円板コイル
42 磁性体コア 43 整流素子
44 磁性体コア 45 平滑コンデンサ
46,47 端子 48 金属筐体
49 シート 50 ネジ
51 絶縁物
41 Primary winding 41a, 41b Terminal 41c Through hole 41d Toroidal disk coil 42 Magnetic core 43 Rectifier element 44 Magnetic core 45 Smoothing capacitor 46, 47 Terminal 48 Metal housing 49 Sheet 50 Screw 51 Insulator

Claims (9)

  1. 一次巻線の両端に印加される交流電圧を二次巻線から異なる交流電圧に変換して出力するトランスと、
    前記二次巻線から出力される交流電圧を整流する整流回路と、
    前記整流回路で得られたリップル電圧波形を平滑する平滑回路と、
    前記平滑回路で得られた直流電圧を外部に出力する出力端子とを備えるスイッチング電源において、
    前記トランスの二次巻線はセンタータップにより電気的に分割されるセンタータップ式トランスの第1と第2二次巻線を有すると共に、
    前記スイッチング電源には、本体を金属筺体へ設置固定するための固定兼放熱用足部を備え、
    前記トランスの第1と第2二次巻線を構成する二次巻線用バスバー前記平滑回路の配線を構成する平滑回路用バスバー及び前記固定兼放熱用足部が、同一の導電板から一体に切り出された形成体で構成されていることを特徴とするスイッチング電源。
    A transformer that converts the alternating voltage applied across the primary winding from the secondary winding to a different alternating voltage and outputs it;
    A rectifier circuit for rectifying the AC voltage output from the secondary winding;
    A smoothing circuit for smoothing a ripple voltage waveform obtained by the rectifier circuit;
    In a switching power supply comprising an output terminal that outputs the DC voltage obtained by the smoothing circuit to the outside,
    The secondary winding of the transformer has first and second secondary windings of a center tap transformer that is electrically divided by a center tap,
    The switching power supply includes a fixing and heat dissipation foot for fixing the main body to the metal housing,
    The first secondary winding busbar composing the second secondary winding of the transformer, a smoothing circuit busbar and the fixed and radiating legs constituting the wiring of the smoothing circuit, integrally from the same conductive plate A switching power supply characterized in that the switching power supply is formed of a formed body cut out into two.
  2. 前記固定兼放熱用足部は、前記二次巻線用バスバーと前記平滑回路用バスバーの間に配置されることを特徴とする請求項1記載のスイッチング電源。 The switching power supply according to claim 1, wherein the fixing / radiating foot is disposed between the bus bar for secondary winding and the bus bar for smoothing circuit.
  3. 前記固定兼放熱用足部は、前記二次巻線用バスバーの整流素子接続用バスバー端子側に配置されることを特徴とする請求項1記載のスイッチング電源。 2. The switching power supply according to claim 1, wherein the fixing / radiating foot is disposed on a rectifying element connecting bus bar terminal side of the secondary winding bus bar.
  4. 前記平滑回路用バスバーには、前記平滑回路を構成するインダクタを含んでいることを特徴とする請求項1記載のスイッチング電源。   The switching power supply according to claim 1, wherein the smoothing circuit bus bar includes an inductor constituting the smoothing circuit.
  5. 前記平滑回路用バスバーとその前記出力端子とを接続する出力端子接続用バスバーをさらに備え、前記出力端子と前記出力端子接続用バスバーは、前記二次巻線用バスバーと前記平滑回路用バスバーと共に、同一の前記導電板から一体に切り出された形成体で構成されていることを特徴とする請求項1〜請求項4のいずれか1項に記載のスイッチング電源。 Further comprising an output terminal connection bus bar for connecting the smoothing circuit bus bar and the output terminal thereof, the output terminal and the output terminal connection bus bar together with the secondary winding bus bar and the smoothing circuit bus bar, the switching power supply according to any one of claims 1 to 4, characterized in that it is constituted by a formed body which is cut integrally from the same of the conductive plate.
  6. 前記形成体は、平板状導電板から切り出され、折り曲げられた形成体であることを特徴とする請求項1〜請求項5記載のスイッチング電源。 6. The switching power supply according to claim 1 , wherein the formed body is a formed body cut out and bent from a flat conductive plate.
  7. 前記固定兼放熱用足部は、前記平滑回路用バスバーの前記出力端子側に配置されることを特徴とする請求項1記載のスイッチング電源。 The switching power supply according to claim 1, wherein the fixing / radiating foot is disposed on the output terminal side of the smoothing circuit bus bar.
  8. 前記固定兼放熱用足部は、前記平滑回路用バスバーと前記出力端子接続用バスバーの間に配置されることを特徴とする請求項5記載のスイッチング電源。 6. The switching power supply according to claim 5, wherein the fixing / radiating foot is disposed between the smoothing circuit bus bar and the output terminal connecting bus bar.
  9. 同一の前記導電板に前記二次巻線用バスバー、前記平滑回路用バスバー、及び前記出力端子を配置したときに、それらの外接矩形内に前記固定兼放熱用足部が配置されていることを特徴とする請求項1記載のスイッチング電源。 Same of the secondary winding busbar to the conductive plate, the smoothing circuit busbar, and when placing the said output terminal, said fixed and radiating foot to their circumscribed rectangle is located The switching power supply according to claim 1 .
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US9852841B2 (en) 2014-01-27 2017-12-26 Panasonic Intellectual Property Management Co., Ltd. Coil structure, transformer, and power converter
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