JP3743251B2

JP3743251B2 - Power supply

Info

Publication number: JP3743251B2
Application number: JP2000072385A
Authority: JP
Inventors: 寛之浅野
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2000-03-15
Filing date: 2000-03-15
Publication date: 2006-02-08
Anticipated expiration: 2020-03-15
Also published as: JP2001268940A

Description

【０００１】
【発明の属する技術分野】
本発明は商用電源からインバータを介して負荷を駆動する電源装置に関するものである。
【０００２】
【従来の技術】
近年、商用電源からの入力高調波電流成分を抑制するために、図２に示すような回路構成の電源装置が用いられている。以下、その回路構成について詳述する。交流電源ＡＣには、ダイオードブリッジ等の整流部ＤＢを接続し、この整流部ＤＢの出力端子間に、第１のダイオードＤ１及び第２のダイオードＤ２とコンデンサＣ６の並列回路を直列接続した回路で構成される入力電流歪改善部５を介して、一対のスイッチング素子Ｑ１，Ｑ２の直列回路から構成されるインバータ部２を接続し、整流部ＤＢとインバータ部２の間は配線Ｖ_DCで、インバータ部２と入力電流歪改善部５の間は配線ＧＮＤでそれぞれ接続されている。
【０００３】
直流電源部１として、スイッチング素子Ｑ１と並列に平滑用のコンデンサＣ１、インダクタンス素子Ｌ０、ダイオードＤ３の直列回路を接続し、ダイオードＤ３とスイッチング素子Ｑ２の直列回路にはダイオードＤ４を逆方向に並列接続し、平滑用のコンデンサＣ１、インダクタンス素子Ｌ０、ダイオードＤ４の直列回路にはコンデンサＣ２を並列接続してある。
【０００４】
一方、インバータ回路としては、上記インバータ部２と、上記両スイッチング素子Ｑ１，Ｑ２の接続点とダイオードＤ１，Ｄ２の接続点との間に接続した直流カット用のコンデンサＣ３を含む出力部３と、スイッチング素子Ｑ１，Ｑ２を交互に高周波でオン、オフ駆動する制御部４で構成される。
【０００５】
出力部３は、リーケージトランスＬＴ１と、その２次側巻線ｎ２に接続されたコンデンサＣ５と放電灯ＬＡの直列回路、並びに放電灯ＬＡのフィラメントの非電源側端子間に並列接続されたコンデンサＣ４を含み、リーケージトランスＬＴ１の１次側巻線ｎ１が上述の直流カット用コンデンサＣ３と直列に接続されている。
【０００６】
次に、図２の回路構成をプリント配線板に実装した従来の実装例を図３に示す。図３のプリント配線板６は細長に形成され、出力部３からのランプ配線ａ〜ｄが長手方向の一端に配置され、長手方向の他端から交流電源ＡＣが得られるように配置されている。交流電源ＡＣから整流部ＤＢ、入力電流歪改善部５、直流電源部１、制御部４、インバータ部２、出力部３がプリント配線板６の長手方向に沿って実装されている。入力電流歪改善部５からは主回路配線Ｖ_L及び出力配線を流れる電流に対応する帰還電流が流れるグランド配線ＧＮＤが、また、整流部ＤＢからは主回路配線Ｖ_DCがプリント配線板６の長手方向に沿って出力部３に向かって配線されている。
【０００７】
【発明が解決しようとする課題】
しかしながら、図３のような実装、配線構成とすると、主回路配線Ｖ_DC及びＶ_L及びグランド配線ＧＮＤのような比較的大きな電流が流れる雑音発生部分が、制御部４のような比較的小さな電流が流れており、雑音の影響を受けやすい部分を囲むように実装されており、雑音発生部からの影響を制御部４のような雑音に弱い部分が受けやすくなり、誤動作を招きやすいという欠点があった。
【０００８】
本発明は、このような複数の雑音発生部が存在しても、その間での相互干渉を抑え、誤動作を防止できる電源装置を提供しようとするものである。
【０００９】
【課題を解決するための手段】
上記問題点を解決するために、請求項１記載の発明によれば、図１に示すように、商用電源ＡＣを全波整流する整流器を備えた整流部ＤＢと、整流部の出力である脈流電圧を平滑コンデンサで直流電源に変換する直流電源部１と、二つのスイッチング素子の直列回路を備え前記直流電源部の出力を高周波に変換するインバータ部２と、インバータ部の出力から負荷へと接続される出力部３と、スイッチング素子をスイッチング制御するための制御部４とがプリント配線板６に実装されており、前記プリント配線板６は細長に形成され、出力部３からの配線がプリント配線板６の長手方向の一端から得られるように配置されている電源装置において、プリント配線板６の長手方向の一端より整流部ＤＢ、制御部４、直流電源部１、インバータ部２、出力部３の順に実装し、且つプリント配線板６の長手方向に対してほぼ平行に長手方向に沿った端部近傍より整流部ＤＢから直流電源部１に接続される高圧側の出力配線Ｖ_DC、その出力配線を流れる電流に対応する帰還電流が流れるグランド配線ＧＮＤ、制御部４の配線の順にパターンを形成したことを特徴とする。
【００１０】
請求項２記載の発明によれば、上記構成において、直流電源部１は、図４に示すように、インダクタＬ１及びスイッチング素子Ｑ３の直列回路と、前記スイッチング素子Ｑ３に並列に接続された逆流阻止用のダイオードＤ５及び平滑用のコンデンサＣ１の直列回路と、前記スイッチング素子Ｑ３の制御部７とで構成されたことを特徴とする。
【００１１】
請求項３記載の発明によれば、図１及び図２に示すように、商用電源ＡＣを全波整流する整流器を備えた整流部ＤＢと、前記整流部ＤＢの両出力端間に接続された二つのスイッチング素子Ｑ１，Ｑ２の直列回路を備えたインバータ部２と、前記整流部ＤＢと前記インバータ部２との間に介して順方向に直列接続され前記整流部ＤＢにつながる第１のダイオードＤ１と前記インバータ部２につながる第２のダイオードＤ２及び前記第２のダイオードＤ２に並列接続されたコンデンサＣ６からなる入力電流歪改善部５と、前記インバータ部２と並列に接続された平滑コンデンサＣ１を備えた直流電源部１と、インバータ部２の前記二つのスイッチング素子Ｑ１，Ｑ２の接続点と入力電流歪改善部５の前記第１、第２のダイオードＤ１，Ｄ２の接続点との間に介して接続された出力部３と、スイッチング素子Ｑ１，Ｑ２をスイッチング制御するための制御部４がプリント配線板６に実装されており、前記プリント配線板６は細長に形成され、出力部３からの配線ａ〜ｄがプリント配線板６の長手方向の一端から得られるように配置されている電源装置において、プリント配線板６の長手方向の一端より整流部ＤＢ、入力電流歪改善部５、制御部４、直流電源部１、インバータ部２、出力部３の順に実装し、且つプリント配線板６の長手方向に対してほぼ平行に長手方向に沿った端部より入力電流歪改善部５と出力部３とを結ぶ第１の出力配線Ｖ_L、整流部ＤＢから直流電源部１及びインバータ部２に接続される高圧側の第２の出力配線Ｖ_DC、それらの出力配線を流れる電流に対応する帰還電流が流れるグランド配線ＧＮＤ、制御部４の配線の順にパターンを形成したことを特徴とする。
【００１２】
請求項４記載の発明によれば、上記構成において、直流電源部は、図２に示すように、平滑用コンデンサＣ１とインダクタンス素子Ｌ０と前記平滑用コンデンサＣ１の充電方向に接続される第３のダイオードＤ３からなる直列回路を前記インバータ部２の一方のスイッチング素子Ｑ１と並列に接続すると共に、第３のダイオードＤ３と前記インバータ部２の他方のスイッチング素子Ｑ２の直列回路に逆方向に第４のダイオードＤ４を並列接続し、前記インバータ部２の２つのスイッチング素子Ｑ１，Ｑ２の直列回路にコンデンサＣ２を並列に接続して構成されることを特徴とする。
【００１３】
【発明の実施の形態】
（実施形態１）
図１に本発明の第１の実施形態の実装配置図を示す。図３に示した従来例と異なる点は、交流電源ＡＣから整流部ＤＢ、入力電流歪改善部５、制御部４、直流電源部１、インバータ部２、出力部３がプリント配線板６の長手方向に沿って実装され、プリント配線板６の長手方向に対してほぼ平行に長手方向に沿った端部より入力電流歪改善部５と出力部３とを結ぶ出力配線Ｖ_L、整流部ＤＢから直流電源部１及びインバータ部２に接続される出力配線Ｖ_DC、それらの出力配線を流れる電流に対応する帰還電流が流れるグランド配線ＧＮＤ、制御部４の配線の順にパターンを形成した点であり、その他の従来例と同一構成には同一符号を付すことにより説明を省略する。
【００１４】
このような実装配置、配線にすることにより、制御部４は直流電源部１とインバータ部２の間に配置されないため雑音の影響を受けにくく、さらには整流部ＤＢから直流電源部１及びインバータ部２を経由して出力配線Ｖ_DCからグランド配線ＧＮＤに流れる電流のループが制御部４のまわりを介さずに配線され、制御部４は、制御部４の横に配線されたグランド配線ＧＮＤにより出力配線Ｖ_DC及びＶ_Lを流れる電流から遮蔽されるため、制御部４での小信号配線は比較的大きな電流が流れる出力配線Ｖ_DC及びＶ_Lからの雑音の影響を受けにくくなり、誤動作を防止できる。
【００１５】
（実施形態２）
図４に第２の実施形態の回路図を示す。図２に示した従来例と異なる点は、直流電源部１が入力電流歪改善部の役割を含む所謂昇圧チョッパ回路で構成されている点と、出力部３において、放電灯負荷ＬＡがトランス結合することなくコンデンサＣ３と直列に接続された共振用インダクタＬ２を介してインバータ部２の出力に接続されている点である。直流電源部１の昇圧チョッパ回路は、インダクタＬ１及びＦＥＴよりなるスイッチング素子Ｑ３の直列回路と、前記スイッチング素子Ｑ３に並列に接続された逆流阻止用のダイオードＤ５及び平滑用のコンデンサＣ１との直列回路と、スイッチング素子Ｑ３の制御部７とで構成されている。本実施形態では、入力電流歪改善部が直流電源部１に含まれているため、出力配線Ｖ_Lが無いことが特徴である。
【００１６】
図５に本実施形態の実装配置図を示す。実施形態１と異なる点は、交流電源ＡＣから整流部ＤＢ、制御部４、制御部７を含む直流電源部１、インバータ部２、出力部３がプリント配線板６の長手方向に沿って実装され、プリント配線板６の長手方向に対してほぼ平行に長手方向に沿った端部より整流部ＤＢから直流電源部１に接続される出力配線Ｖ_DC、その出力配線Ｖ_DCを流れる電流に対応する帰還電流が流れるグランド配線ＧＮＤ、制御部４の配線の順にパターンを形成した点であり、その他の従来例と同一構成には同一符号を付すことにより説明を省略する。
【００１７】
このような実装配置、配線にすることにより、制御部４は直流電源部１とインバータ部２の間に配置されないため雑音の影響を受けにくく、さらには整流部ＤＢから直流電源部１及びインバータ部２を経由して出力配線Ｖ_DCからグランド配線ＧＮＤに流れる電流のループが制御部４のまわりを介さずに配線され、制御部４は、制御部４の横に配線されたグランド配線ＧＮＤにより出力配線Ｖ_DCを流れる電流から遮蔽されるため、制御部４での小信号配線は比較的大きな電流が流れる出力配線Ｖ_DCからの雑音の影響を受けにくくなり、誤動作を防止できる。
【００１８】
（実施形態３）
図６に第３の実施形態の実装配置図を示す。実施形態１と異なる点は、インバータ部２が放熱板９に取り付けられた２つのＭＯＳＦＥＴ８の直列回路から構成され、グランド配線ＧＮＤ及び出力配線Ｖ_DCは平滑部ＤＢから制御部４を通り過ぎた後、プリント配線板６の長手方向に対してほぼ平行に幅方向（長手方向と垂直な方向）の片側と他側とに分かれて配線され、２つのＭＯＳＦＥＴ８のピンが同じ向きで、ピンの配列方向がプリント配線板６の長手方向に対して垂直となるように実装されている点である。また、放熱板９の形状は図７に示すように、この放熱板９の細長のプリント配線板６の長手方向に対する垂直方向の長さＷが、プリント配線板６の長手方向に対する垂直方向の寸法と同一としている。その他の従来例と同一構成には同一符号を付すことにより説明を省略する。
【００１９】
このような実装配置、配線にすることにより制御部４は直流電源部１とインバータ部２の間に配置されないため雑音の影響を受けにくく、さらには整流部ＤＢから直流電源部１及びインバータ部２を経由して出力配線Ｖ_DCからグランド配線ＧＮＤに流れる電流のループが制御部４のまわりを介さずに配線され、制御部４は、制御部４の横に配線されたグランド配線ＧＮＤにより出力配線Ｖ_DC及びＶ_Lを流れる電流から遮蔽されるため、制御部４での小信号配線は比較的大きな電流が流れる出力配線Ｖ_DCからの雑音の影響を受けにくくなり、誤動作を防止できる。また放熱板９を上記のような構造とすることにより、プリント配線板６を収納するケース本体とねじ無しで接合することができる。
【００２０】
（実施形態４）
図８に第４の実施形態の実装配置図を示す。実施形態１と異なる点は、インバータ部２が放熱板９に取り付けられた２つのＭＯＳＦＥＴ８の直列回路から構成され、グランド配線ＧＮＤ及び出力配線Ｖ_DCは整流部ＤＢから制御部４を通り過ぎた後もプリント配線板６の長手方向に対してほぼ平行に幅方向の片側に配線され、２つのＭＯＳＦＥＴ８のピンが同じ向きで、ピンの配列方向がプリント配線板６の長手方向に対して平行となるように実装されている点である。また放熱板９の形状は図９に示すように、この放熱板９の細長のプリント配線板６の長手方向と垂直な方向の長さＷが、プリント配線板６の幅方向の寸法と同一としている。その他の従来例と同一構成には同一符号を付すことにより説明を省略する。
【００２１】
このような実装配置、配線にすることにより制御部４は直流電源部１とインバータ部２の間に配置されないため雑音の影響を受けにくく、さらには整流部ＤＢから直流電源部１及びインバータ部２を経由して出力配線Ｖ_DCからグランド配線ＧＮＤに流れる電流のループが制御部４のまわりを介さずに配線され、制御部４は、制御部４の横に配線されたグランド配線ＧＮＤにより出力配線Ｖ_DC及びＶ_Lを流れる電流から遮蔽されるため、制御部４での小信号配線は比較的大きな電流が流れる出力配線Ｖ_DCからの雑音の影響を受けにくくなり、誤動作を防止できる。
【００２２】
また、放熱板９を上記のような構造とすることによりプリント配線板６を収納するケース本体とねじ無しで接合することができ、ＭＯＳＦＥＴ８のピンの並び方向がプリント配線板６の長手方向に対して平行でかつピンがプリント配線板６の幅方向の片側に実装されることにより、細長のプリント配線板６においてはプリント配線板６の幅方向（長手方向に対する垂直方向）の配線スペースが広くとれるメリットがある。また、図８のような構成とすると出力配線Ｖ_DC及びグランド配線ＧＮＤからＭＯＳＦＥＴ８への配線が容易となる。
【００２３】
【発明の効果】
請求項１または３の発明によれば、比較的大きな電流が流れる出力配線や直流電源部からインバータの制御部への雑音の影響を抑え、誤動作を防止できるという効果がある。
請求項２または３の発明によれば、入力電流歪を改善できるという効果がある。
請求項４の発明によれば、請求項３の発明において、負荷を流れる電流の波高値を抑制することができ、放電灯負荷の場合、負荷電流の低周波リップルを低減でき、ちらつきを抑える効果がある。
【図面の簡単な説明】
【図１】本発明の第１の実施形態の実装配置と配線を示す平面図である。
【図２】従来の電源装置の回路図である。
【図３】従来の電源装置の実装配置と配線を示す平面図である。
【図４】本発明の第２の実施形態の回路図である。
【図５】本発明の第２の実施形態の実装配置と配線を示す平面図である。
【図６】本発明の第３の実施形態の実装配置と配線を示す平面図である。
【図７】本発明の第３の実施形態におけるインバータ部のスイッチング素子の配置を示す図であり、（ａ）は平面図、（ｂ）は側面図である。
【図８】本発明の第４の実施形態の実装配置と配線を示す平面図である。
【図９】本発明の第４の実施形態におけるインバータ部のスイッチング素子の配置を示す図であり、（ａ）は平面図、（ｂ）は側面図である。
【符号の説明】
１直流電源部
２インバータ部
３出力部
４制御部
５入力電流歪改善部
６プリント配線板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power supply apparatus that drives a load from a commercial power supply via an inverter.
[0002]
[Prior art]
2. Description of the Related Art In recent years, a power supply device having a circuit configuration as shown in FIG. 2 has been used in order to suppress an input harmonic current component from a commercial power supply. The circuit configuration will be described in detail below. The AC power supply AC is a circuit in which a rectifier DB such as a diode bridge is connected, and a parallel circuit of a first diode D1 and a second diode D2 and a capacitor C6 is connected in series between output terminals of the rectifier DB. An inverter unit 2 composed of a series circuit of a pair of switching elements Q1 and Q2 is connected via the configured input current distortion improvement unit 5, and the inverter rectifier DB and the inverter unit 2 are connected by a wiring V _DC . The part 2 and the input current distortion improving part 5 are connected by a wiring GND.
[0003]
As the DC power supply unit 1, a series circuit of a smoothing capacitor C1, an inductance element L0, and a diode D3 is connected in parallel with the switching element Q1, and a diode D4 is connected in parallel in the reverse direction to the series circuit of the diode D3 and the switching element Q2. The capacitor C2 is connected in parallel to the series circuit of the smoothing capacitor C1, the inductance element L0, and the diode D4.
[0004]
On the other hand, as the inverter circuit, the inverter unit 2 and an output unit 3 including a DC cut capacitor C3 connected between the connection point of the switching elements Q1 and Q2 and the connection point of the diodes D1 and D2, The control unit 4 is configured to alternately drive the switching elements Q1, Q2 on and off at a high frequency.
[0005]
The output unit 3 includes a leakage transformer LT1, a capacitor C5 connected to the secondary winding n2 and a series circuit of the discharge lamp LA, and a capacitor C4 connected in parallel between the non-power supply terminals of the filament of the discharge lamp LA. The primary side winding n1 of the leakage transformer LT1 is connected in series with the above-described DC cut capacitor C3.
[0006]
Next, FIG. 3 shows a conventional mounting example in which the circuit configuration of FIG. 2 is mounted on a printed wiring board. The printed wiring board 6 in FIG. 3 is formed in an elongated shape, and lamp wirings a to d from the output unit 3 are arranged at one end in the longitudinal direction, and are arranged so that an AC power source AC is obtained from the other end in the longitudinal direction. . A rectification unit DB, an input current distortion improvement unit 5, a DC power supply unit 1, a control unit 4, an inverter unit 2, and an output unit 3 are mounted along the longitudinal direction of the printed wiring board 6 from the AC power source AC. From the input current distortion improving section 5, the ground wiring GND through which a feedback current corresponding to the current flowing through the main circuit wiring _VL and the output wiring flows, and from the rectifying section DB, the main circuit wiring _VDC is the longitudinal length of the printed wiring board 6. It is wired toward the output unit 3 along the direction.
[0007]
[Problems to be solved by the invention]
However, if the mounting and wiring configuration is as shown in FIG. 3, the noise generating portions such as the main circuit wirings V _DC and V _L and the ground wiring GND through which a relatively large current flows are relatively small currents such as the control unit 4. It is mounted so as to surround a portion that is susceptible to noise, and a portion that is susceptible to noise, such as the control unit 4, is susceptible to noise from the noise generation unit, thus causing a malfunction. there were.
[0008]
The present invention intends to provide a power supply apparatus that can suppress mutual interference between the plurality of noise generation units and prevent malfunction.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problem, according to the invention described in claim 1, as shown in FIG. 1, a rectification unit DB including a rectifier for full-wave rectification of the commercial power supply AC, and a pulse which is an output of the rectification unit. A DC power supply unit 1 for converting a current voltage into a DC power supply with a smoothing capacitor; an inverter unit 2 having a series circuit of two switching elements for converting the output of the DC power supply unit into a high frequency; and an output from the inverter unit to a load The output unit 3 to be connected and the control unit 4 for switching control of the switching element are mounted on the printed wiring board 6. The printed wiring board 6 is formed in an elongated shape, and the wiring from the output unit 3 is printed. a power supply device which is arranged so as to obtain from one end in the longitudinal direction of the wiring board 6, the rectifying unit from one end in the longitudinal direction of the printed circuit board 6 DB, the control unit 4, the DC power supply unit 1, the inverter unit , Mounted in the order of the output unit 3, and output wiring V of the high-pressure side connected from the rectifier DB to the DC power supply 1 from the end portion in the longitudinal direction substantially parallel to the longitudinal direction of the printed wiring board 6 _A pattern is formed in the order of _DC , ground wiring GND through which a feedback current corresponding to the current through the output wiring flows, and wiring of the control unit 4.
[00 10 ]
According to the second aspect of the present invention, in the above configuration, as shown in FIG. 4, the DC power supply unit 1 includes a series circuit of the inductor L1 and the switching element Q3, and a backflow prevention connected in parallel to the switching element Q3. And a smoothing capacitor C1 and a control unit 7 of the switching element Q3.
[00 11 ]
According to invention of Claim 3 , as shown in FIG.1 and FIG.2, it connected between the rectification part DB provided with the rectifier which carries out full wave rectification of commercial power supply AC, and both the output terminals of the said rectification part DB. An inverter unit 2 having a series circuit of two switching elements Q1 and Q2, and a first diode D1 connected in series in the forward direction between the rectifier unit DB and the inverter unit 2 and connected to the rectifier unit DB And an input current distortion improving unit 5 comprising a second diode D2 connected to the inverter unit 2 and a capacitor C6 connected in parallel to the second diode D2, and a smoothing capacitor C1 connected in parallel to the inverter unit 2. Connection between the DC power supply unit 1 provided, the connection point of the two switching elements Q1 and Q2 of the inverter unit 2, and the first and second diodes D1 and D2 of the input current distortion improvement unit 5 And the output unit 3 connected between the control unit 4 and the control unit 4 for controlling the switching of the switching elements Q1 and Q2 are mounted on the printed wiring board 6, and the printed wiring board 6 is formed in an elongated shape, In the power supply device arranged so that the wirings a to d from the output unit 3 are obtained from one end in the longitudinal direction of the printed wiring board 6, the rectifying unit DB and the input current distortion are improved from one end in the longitudinal direction of the printed wiring board 6. Mounted in the order of the unit 5, the control unit 4, the DC power supply unit 1, the inverter unit 2, and the output unit 3, and improves the input current distortion from the end along the longitudinal direction substantially parallel to the longitudinal direction of the printed wiring board 6. The first output wiring V _L connecting the section 5 and the output section 3, the second output wiring V _DC on the high voltage side connected to the DC power supply section 1 and the inverter section 2 from the rectification section DB, and the output wiring flow Feedback corresponding to current Flow, characterized in that the formation of the pattern is the ground line GND flowing, the order of the wiring of the control unit 4.
[00 12 ]
According to the invention of claim 4 , in the above configuration, as shown in FIG. 2, the DC power supply unit is connected to the smoothing capacitor C1, the inductance element L0, and the third capacitor connected in the charging direction of the smoothing capacitor C1. A series circuit composed of a diode D3 is connected in parallel with one switching element Q1 of the inverter unit 2, and a fourth circuit is connected in the reverse direction to the series circuit of the third diode D3 and the other switching element Q2 of the inverter unit 2. A diode D4 is connected in parallel, and a capacitor C2 is connected in parallel to a series circuit of two switching elements Q1 and Q2 of the inverter unit 2.
[00 13 ]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
FIG. 1 shows a mounting layout of the first embodiment of the present invention. 3 differs from the conventional example shown in FIG. 3 in that the AC power source AC is connected to the rectifying unit DB, the input current distortion improving unit 5, the control unit 4, the DC power source unit 1, the inverter unit 2, and the output unit 3 in the longitudinal direction of the printed wiring board 6. From the output wiring V _L , which connects the input current distortion improving unit 5 and the output unit 3 from the end along the longitudinal direction, substantially parallel to the longitudinal direction of the printed wiring board 6, and from the rectifying unit DB A pattern is formed in the order of the output wiring V _DC connected to the DC power supply unit 1 and the inverter unit 2, the ground wiring GND through which a feedback current corresponding to the current flowing through the output wiring flows, and the wiring of the control unit 4. The same components as those of the other conventional examples are denoted by the same reference numerals and the description thereof is omitted.
[00 14 ]
By adopting such mounting arrangement and wiring, the control unit 4 is not arranged between the DC power supply unit 1 and the inverter unit 2 and thus is not easily affected by noise. Further, the DC power supply unit 1 and the inverter unit from the rectification unit DB. 2, a loop of a current flowing from the output wiring V _DC to the ground wiring GND via 2 is routed without passing around the control unit 4, and the control unit 4 outputs by the ground wiring GND wired next to the control unit 4. Since it is shielded from the current flowing through the wirings V _DC and V _L , the small signal wiring in the control unit 4 is less susceptible to noise from the output wirings V _DC and V _L through which a relatively large current flows, and prevents malfunction. it can.
[00 15 ]
(Embodiment 2)
FIG. 4 shows a circuit diagram of the second embodiment. 2 is different from the conventional example shown in FIG. 2 in that the DC power supply unit 1 is formed of a so-called boost chopper circuit including a role of an input current distortion improvement unit, and in the output unit 3, the discharge lamp load LA is transformer-coupled. Without being connected to the output of the inverter unit 2 via the resonance inductor L2 connected in series with the capacitor C3. The step-up chopper circuit of the DC power supply unit 1 includes a series circuit of a switching element Q3 including an inductor L1 and an FET, a backflow prevention diode D5 and a smoothing capacitor C1 connected in parallel to the switching element Q3. And the control unit 7 of the switching element Q3. The present embodiment is characterized in that since the input current distortion improving section is included in the DC power supply section 1, there is no output wiring V _L.
[00 16 ]
FIG. 5 shows a mounting layout of this embodiment. The difference from the first embodiment is that the AC power source AC, the rectifying unit DB, the control unit 4, the DC power source unit 1 including the control unit 7, the inverter unit 2, and the output unit 3 are mounted along the longitudinal direction of the printed wiring board 6. The output wiring V _DC connected from the rectifying unit DB to the DC power supply unit 1 from the end along the longitudinal direction substantially parallel to the longitudinal direction of the printed wiring board 6 corresponds to the current flowing through the output wiring V _DC. The pattern is formed in the order of the ground wiring GND through which the feedback current flows and the wiring of the control unit 4. The same reference numerals are given to the same components as those in the other conventional examples, and the description is omitted.
[00 17 ]
By adopting such mounting arrangement and wiring, the control unit 4 is not arranged between the DC power supply unit 1 and the inverter unit 2 and thus is not easily affected by noise. Further, the DC power supply unit 1 and the inverter unit from the rectification unit DB. 2, a loop of a current flowing from the output wiring V _DC to the ground wiring GND via 2 is routed without passing around the control unit 4, and the control unit 4 outputs by the ground wiring GND wired next to the control unit 4. Since it is shielded from the current flowing through the wiring V _DC , the small signal wiring in the control unit 4 is less susceptible to noise from the output wiring V _DC through which a relatively large current flows, and can prevent malfunction.
[00 18 ]
(Embodiment 3)
FIG. 6 shows a mounting layout of the third embodiment. The difference from the first embodiment is that the inverter unit 2 is composed of a series circuit of two MOSFETs 8 attached to the heat sink 9, and the ground wiring GND and the output wiring V _DC pass through the control unit 4 from the smoothing unit DB. Wiring is divided into one side and the other side in the width direction (perpendicular to the longitudinal direction) substantially parallel to the longitudinal direction of the printed wiring board 6, the pins of the two MOSFETs 8 are in the same direction, and the arrangement direction of the pins is This is that the printed wiring board 6 is mounted so as to be perpendicular to the longitudinal direction. Further, as shown in FIG. 7, the shape of the heat sink 9 is such that the length W of the heat sink 9 in the vertical direction with respect to the longitudinal direction of the elongated printed wiring board 6 is the dimension in the direction perpendicular to the longitudinal direction of the printed wiring board 6. Are the same. The same components as those of the other conventional examples are denoted by the same reference numerals and the description thereof is omitted.
[00 19 ]
By adopting such mounting arrangement and wiring, the control unit 4 is not arranged between the DC power supply unit 1 and the inverter unit 2, so that it is not easily affected by noise, and further from the rectification unit DB to the DC power supply unit 1 and the inverter unit 2. A loop of a current flowing from the output wiring V _DC to the ground wiring GND via the wiring is routed without passing around the control section 4, and the control section 4 is connected to the output wiring by the ground wiring GND wired beside the control section 4. Since it is shielded from the current flowing through V _DC and V _L , the small signal wiring in the control unit 4 is less susceptible to noise from the output wiring V _DC through which a relatively large current flows, and can prevent malfunction. Moreover, by making the heat sink 9 have the above-described structure, it can be joined without a screw to the case main body that houses the printed wiring board 6.
[00 20 ]
(Embodiment 4)
FIG. 8 shows a mounting layout of the fourth embodiment. The difference from the first embodiment is that the inverter unit 2 is composed of a series circuit of two MOSFETs 8 attached to the heat sink 9, and the ground wiring GND and the output wiring V _DC are passed through the control unit 4 from the rectification unit DB. Wiring is performed on one side in the width direction substantially parallel to the longitudinal direction of the printed wiring board 6, so that the pins of the two MOSFETs 8 are in the same direction and the arrangement direction of the pins is parallel to the longitudinal direction of the printed wiring board 6. It is a point that is implemented in. As shown in FIG. 9, the shape of the heat sink 9 is such that the length W of the heat sink 9 in the direction perpendicular to the longitudinal direction of the elongated printed wiring board 6 is the same as the dimension in the width direction of the printed wiring board 6. Yes. The same components as those of the other conventional examples are denoted by the same reference numerals and the description thereof is omitted.
[00 21 ]
By adopting such mounting arrangement and wiring, the control unit 4 is not arranged between the DC power supply unit 1 and the inverter unit 2, so that it is not easily affected by noise, and further from the rectification unit DB to the DC power supply unit 1 and the inverter unit 2. A loop of a current flowing from the output wiring V _DC to the ground wiring GND via the wiring is routed without passing around the control section 4, and the control section 4 is connected to the output wiring by the ground wiring GND wired beside the control section 4. Since it is shielded from the current flowing through V _DC and V _L , the small signal wiring in the control unit 4 is less susceptible to noise from the output wiring V _DC through which a relatively large current flows, and can prevent malfunction.
[00 22 ]
Further, by making the heat sink 9 as described above, it can be joined without a screw to the case main body that houses the printed wiring board 6, and the pin alignment direction of the MOSFET 8 is relative to the longitudinal direction of the printed wiring board 6. Since the pins are mounted on one side in the width direction of the printed wiring board 6, a wide wiring space in the width direction (perpendicular to the longitudinal direction) of the printed wiring board 6 can be taken in the elongated printed wiring board 6. There are benefits. Further, with the configuration as shown in FIG. 8, wiring from the output wiring V _DC and the ground wiring GND to the MOSFET 8 becomes easy.
[00 23 ]
【The invention's effect】
According to the invention of claim 1 or 3 , there is an effect that it is possible to suppress the influence of noise from the output wiring and the DC power supply unit through which a relatively large current flows, to the control unit of the inverter, and to prevent malfunction.
According to the invention of claim 2 or 3 , there is an effect that the input current distortion can be improved.
According to the invention of claim 4, in the invention of claim 3 , the peak value of the current flowing through the load can be suppressed, and in the case of a discharge lamp load, the low frequency ripple of the load current can be reduced and the effect of suppressing flickering There is.
[Brief description of the drawings]
FIG. 1 is a plan view showing a mounting arrangement and wiring according to a first embodiment of the present invention.
FIG. 2 is a circuit diagram of a conventional power supply device.
FIG. 3 is a plan view showing a mounting arrangement and wiring of a conventional power supply device.
FIG. 4 is a circuit diagram of a second embodiment of the present invention.
FIG. 5 is a plan view showing a mounting arrangement and wiring according to a second embodiment of the present invention.
FIG. 6 is a plan view showing a mounting arrangement and wiring according to a third embodiment of the present invention.
7A and 7B are diagrams showing an arrangement of switching elements of an inverter unit according to a third embodiment of the present invention, where FIG. 7A is a plan view and FIG. 7B is a side view.
FIG. 8 is a plan view showing a mounting arrangement and wiring according to a fourth embodiment of the present invention.
FIGS. 9A and 9B are diagrams showing an arrangement of switching elements of an inverter unit in a fourth embodiment of the present invention, where FIG. 9A is a plan view and FIG. 9B is a side view;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 DC power supply part 2 Inverter part 3 Output part 4 Control part 5 Input current distortion improvement part 6 Printed wiring board

Claims

A rectifier having a rectifier for full-wave rectification of a commercial power supply, a DC power supply for converting a pulsating voltage output from the rectifier to a DC power supply using a smoothing capacitor, and a series circuit of two switching elements. An inverter unit for converting the output of the unit into a high frequency, an output unit connected to the load from the output of the inverter unit, and a control unit for switching control of the switching element are mounted on the printed wiring board, In the power supply device in which the wiring board is formed in an elongated shape and arranged so that the wiring from the output unit can be obtained from one end in the longitudinal direction of the printed wiring board, the rectifying unit, the control unit, DC power supply unit, the inverter unit, mounted in the order of the output section, the straight from the rectifier unit from the end portion in the longitudinal direction substantially parallel to and longitudinally of the printed circuit board High-voltage side of the output line connected to the power supply unit, the output wiring ground wires feedback current flows corresponding to the current flowing in the power supply device being characterized in that to form a pattern in the order of the wiring of the control unit.

The DC power supply unit is configured by a series circuit of an inductor and a switching element, a series circuit of a backflow prevention diode and a smoothing capacitor connected in parallel to the switching element, and a control unit of the switching element. The power supply device according to claim 1, wherein

A rectifier having a rectifier for full-wave rectification of a commercial power source, an inverter having a series circuit of two switching elements connected between both output ends of the rectifier, and the rectifier and the inverter An input current distortion improvement unit comprising a first diode connected in series in the forward direction between the first diode connected to the rectification unit, a second diode connected to the inverter unit, and a capacitor connected in parallel to the second diode; A DC power supply unit including a smoothing capacitor connected in parallel with the inverter unit, a connection point of the two switching elements of the inverter unit, and a connection point of the first and second diodes of the input current distortion improvement unit An output unit connected between the control unit and a control unit for switching control of the switching element is mounted on the printed wiring board, Is formed to a length, in the power supply wiring is arranged so as to obtain from one longitudinal end of the printed wiring board from the output unit, the rectifying unit from one end in the longitudinal direction of the printed wiring board, the input current distortion correction part, The control unit, the DC power supply unit, the inverter unit, and the output unit are mounted in this order, and the input current distortion improving unit and the output unit are connected from the end along the longitudinal direction substantially parallel to the longitudinal direction of the printed wiring board. 1 output wiring, second output wiring on the high voltage side connected from the rectifier unit to the DC power supply unit and the inverter unit, ground wiring through which a feedback current corresponding to the current flowing through the output wiring flows, and wiring of the control unit A power supply device characterized by forming a pattern.

The DC power supply unit is configured to connect a series circuit including a smoothing capacitor, an inductance element, and a third diode connected in a charging direction of the smoothing capacitor in parallel with one switching element of the inverter unit. A fourth diode is connected in parallel in the reverse direction to the series circuit of the diode and the other switching element of the inverter unit, and a capacitor is connected in parallel to the series circuit of the two switching elements of the inverter unit. The power supply device according to claim 3, wherein: