JP2021023054A - Ac output power source - Google Patents

Ac output power source Download PDF

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JP2021023054A
JP2021023054A JP2019138884A JP2019138884A JP2021023054A JP 2021023054 A JP2021023054 A JP 2021023054A JP 2019138884 A JP2019138884 A JP 2019138884A JP 2019138884 A JP2019138884 A JP 2019138884A JP 2021023054 A JP2021023054 A JP 2021023054A
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inverter
current
transformer
alternating current
output power
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JP6612482B1 (en
Inventor
増田　正
Tadashi Masuda
正 増田
明弘 石山
Akihiro Ishiyama
明弘 石山
淳 芦田
Atsushi Ashida
淳 芦田
翔太 廣滝
Shota Hirotaki
翔太 廣滝
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Origin Co Ltd
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Origin Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling

Abstract

To provide an AC output power source capable of reducing the number of circuit stages.SOLUTION: The AC output power source includes: a rectifier 11 for rectifying an input alternating current 10 into a direct current; an inverter 12 for inverting a direct current from the rectifier 11 into an alternating current with higher frequency than the input alternating current 10; and a transformer 13 whose primary side and secondary side are isolated from each other and which outputs the alternating current inverted by the inverter 12 input into the primary side to a load 22 connected directly to the secondary side.SELECTED DRAWING: Figure 2

Description

本開示は、負荷に交流電力を供給する交流出力電源に関する。 The present disclosure relates to an AC output power source that supplies AC power to a load.

ＵＶランプのような負荷に交流電力を供給する交流出力電源が知られている（例えば、特許文献１を参照。）。図１は特許文献１に記載される交流出力電源を説明する図である。 An AC output power source that supplies AC power to a load such as a UV lamp is known (see, for example, Patent Document 1). FIG. 1 is a diagram illustrating an AC output power supply described in Patent Document 1.

特開平０７−１０６０８７号公報Japanese Unexamined Patent Publication No. 07-106087

特許文献１のような交流出力電源は、商用交流を直流に変換する整流器１１、その直流を高周波の交流に変換するインバータ１２、その交流を昇圧するための絶縁トランス１３、その出力を再度直流に変換する整流器１４、及びその直流を所望周波数の矩形波の交流に変換するインバータ１５を備えている。このように、従来の交流出力電源は、多くの回路を多段に接続する構成のため、コスト、サイズ、重量、価格、及び制御の面で課題があった。 The AC output power supply as in Patent Document 1 includes a rectifier 11 that converts commercial AC to DC, an inverter 12 that converts the DC to high-frequency AC, an insulating transformer 13 for boosting the AC, and the output to DC again. It includes a rectifier 14 for conversion and an inverter 15 for converting the direct current into an alternating current of a rectangular wave having a desired frequency. As described above, the conventional AC output power supply has problems in terms of cost, size, weight, price, and control because it is configured to connect many circuits in multiple stages.

そこで、本発明は、前記課題を解決するために、回路段数を低減できる交流出力電源を提供することを目的とする。 Therefore, an object of the present invention is to provide an AC output power supply capable of reducing the number of circuit stages in order to solve the above problems.

上記目的を達成するために、本発明に係る交流出力電源は、整流器及びインバータをトランスの商用電源側のみに配置することとした。 In order to achieve the above object, in the AC output power supply according to the present invention, the rectifier and the inverter are arranged only on the commercial power supply side of the transformer.

具体的には、本発明に係る交流出力電源は、
入力される交流を直流に整流する整流器と、
前記整流器からの直流を前記入力される交流より周波数が高い交流に変換するインバータと、
一次側と二次側とが絶縁しており、前記一次側に入力された交流を前記二次側に直接接続される負荷に出力するトランスと、
前記インバータが変換した交流を前記トランスの前記一次側に入力するインダクタンス手段を有する回路と、
を備える。 Specifically, the AC output power supply according to the present invention is
A rectifier that rectifies the input alternating current to direct current,
An inverter that converts direct current from the rectifier into alternating current with a higher frequency than the input alternating current,
A transformer in which the primary side and the secondary side are insulated and the alternating current input to the primary side is output to a load directly connected to the secondary side.
A circuit having an inductance means that inputs the alternating current converted by the inverter to the primary side of the transformer, and
To be equipped.

また、本発明に係る他の交流出力電源は、
入力される交流を直流に整流する整流器と、
前記整流器からの直流を前記入力される交流より周波数が高い交流に変換するインバータと、
一次側に入力された交流を二次側に直接接続される非接地の負荷に出力する単巻巻線型のトランスと、
前記インバータが変換した交流を前記トランスの前記一次側に入力するインダクタンス手段を有する回路と、
を備える。 Further, the other AC output power supply according to the present invention is
A rectifier that rectifies the input alternating current to direct current,
An inverter that converts direct current from the rectifier into alternating current with a higher frequency than the input alternating current,
A single-winding type transformer that outputs the AC input to the primary side to an ungrounded load directly connected to the secondary side,
A circuit having an inductance means that inputs the alternating current converted by the inverter to the primary side of the transformer, and
To be equipped.

本交流出力電源は、負荷側の整流器及びインバータを廃止したため、コスト、サイズ、重量、価格、及び制御の面を改善することができる。従って、本発明は、回路段数を低減できる交流出力電源を提供することができる。 Since this AC output power supply eliminates the rectifier and inverter on the load side, it is possible to improve the cost, size, weight, price, and control aspects. Therefore, the present invention can provide an AC output power supply capable of reducing the number of circuit stages.

本発明は、接続する回路段数を低減できる交流出力電源を提供することができる。 The present invention can provide an AC output power supply that can reduce the number of circuit stages to be connected.

本発明に関連する交流出力電源を説明する図である。It is a figure explaining the AC output power source which concerns on this invention. 本発明に係る交流出力電源を説明する図である。It is a figure explaining the AC output power source which concerns on this invention. 本発明に係る交流出力電源が備えるインバータの回路を説明する図である。It is a figure explaining the circuit of the inverter included in the AC output power source which concerns on this invention. 本発明に係る交流出力電源が備えるインバータが出力するトランス電流の波形を説明する図である。It is a figure explaining the waveform of the transformer current output by the inverter provided in the AC output power source which concerns on this invention. 本発明に係る交流出力電源が備えるインバータが出力するトランス電流の波形を説明する図である。It is a figure explaining the waveform of the transformer current output by the inverter provided in the AC output power source which concerns on this invention.

添付の図面を参照して本発明の実施形態を説明する。以下に説明する実施形態は本発明の実施例であり、本発明は、以下の実施形態に制限されるものではない。なお、本明細書及び図面において符号が同じ構成要素は、相互に同一のものを示すものとする。 Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In this specification and drawings, the components having the same reference numerals shall indicate the same components.

図２は、本実施形態の交流出力電源を説明する図である。本交流出力電源は、
入力される交流１０を直流に整流する整流器１１と、
整流器１１からの直流を入力される交流１０より周波数が高い交流に変換するインバータ１２と、
一次側と二次側とが絶縁しており、インダクタンス手段Ｌ１を有する回路２１を介して前記一次側に入力されたインバータ１２が変換した交流を、前記二次側に直接接続される負荷２２に出力するトランス１３と、
を備える。 FIG. 2 is a diagram illustrating an AC output power supply of the present embodiment. This AC output power supply is
A rectifier 11 that rectifies the input alternating current 10 to direct current,
An inverter 12 that converts direct current from the rectifier 11 into alternating current with a higher frequency than the input alternating current 10.
The primary side and the secondary side are insulated, and the alternating current converted by the inverter 12 input to the primary side via the circuit 21 having the inductance means L1 is transferred to the load 22 directly connected to the secondary side. The output transformer 13 and
To be equipped.

交流１０は、例えば５０Ｈｚ、１００Ｖの商用電源である。整流器１１は、交流１０を直流に変換してインバータ１２へ出力する。インバータ１２は、直流を交流に変換して出力する。図３はインバータ１２の回路を説明する図である。インバータ１２は、４つのスイッチ（ＳＷ Ａ〜Ｄ）がブリッジ接続され、これらのスイッチを所定のタイミングでオン又はオフすることで直流から交流に変換することができる。 The AC 10 is, for example, a commercial power source of 50 Hz and 100 V. The rectifier 11 converts alternating current 10 into direct current and outputs it to the inverter 12. The inverter 12 converts direct current into alternating current and outputs it. FIG. 3 is a diagram illustrating a circuit of the inverter 12. In the inverter 12, four switches (SW A to D) are bridge-connected, and direct current can be converted to alternating current by turning these switches on or off at predetermined timings.

ＵＶランプ等のランプ負荷は、電極の磨耗を避けるために直流より交流で駆動することが好ましい。そして、交流の波形がゼロボルト（ゼロアンペア）を継続するとランプの立ち消え（消灯）が発生することがあり、これを防止するためにゼロクロスのある交流波形は矩形波、台形波、三角波、又は正弦波が良いとされる。図３のインバータ１２は、インダクタンス手段Ｌ１を有する回路２１に接続されており、４つのスイッチ（ＳＷ Ａ〜Ｄ）を駆動することで交流を容易に形成できる。 The lamp load such as a UV lamp is preferably driven by alternating current rather than direct current in order to avoid wear of the electrodes. If the AC waveform continues to be zero volt (zero amperes), the lamp may turn off (turn off), and to prevent this, the AC waveform with zero cross is a square wave, trapezoidal wave, triangular wave, or sine wave. Is said to be good. The inverter 12 of FIG. 3 is connected to a circuit 21 having an inductance means L1 and can easily form an alternating current by driving four switches (SW A to D).

また負荷２２のＵＶランプが地絡している場合、もしくは対接地抵抗が低い場合、商用電源１０と出力する交流１９とを絶縁する必要がある。このため、トランス１３は複巻巻線のトランスとする。なお、負荷２２のＵＶランプがアースに対して十分に絶縁されている（非接地の）場合、トランス１３は単巻巻線のトランスでもよい。 Further, when the UV lamp of the load 22 has a ground fault or the ground resistance is low, it is necessary to insulate the commercial power supply 10 and the output AC 19. Therefore, the transformer 13 is a double-wound transformer. When the UV lamp of the load 22 is sufficiently insulated from the ground (non-grounded), the transformer 13 may be a transformer with a single winding.

インバータ１２の出力は交流であるため、配線２３が長くなった場合（例えば、１００ｍ）、配線２３に存在するインダクタンス（図２にて“Ｌ２”で表現）による下式の電圧降下Ｖが発生する。電圧降下Ｖが大きいと負荷２２に所望の電力（電圧）を供給できなくなる。
（式１）
Ｖ＝２πｆＬＩ
ここで、ｆは周波数、Ｌはインダクタンス（Ｌ２）、Ｉは電流である。 Since the output of the inverter 12 is alternating current, when the wiring 23 becomes long (for example, 100 m), the following voltage drop V is generated due to the inductance existing in the wiring 23 (represented by “L2” in FIG. 2). .. If the voltage drop V is large, the desired power (voltage) cannot be supplied to the load 22.
(Equation 1)
V = 2πfLI
Here, f is a frequency, L is an inductance (L2), and I is a current.

式１のように、インバータ１２が出力する交流の周波数が低い方が配線２３のインダクタンス成分による電圧降下Ｖを小さくすることができる。例えば、交流１９の周波数を５０Ｈｚ〜５００Ｈｚ程度とすることが望ましい。一方、トランス１３は磁束密度の関係上、周波数が高い方がサイズを小さくできる。これらを考慮すれば、インバータ１２が出力する交流の周波数は３００Ｈｚ〜５００Ｈｚ程度が望ましい。 As shown in Equation 1, the lower the AC frequency output by the inverter 12, the smaller the voltage drop V due to the inductance component of the wiring 23. For example, it is desirable that the frequency of the alternating current 19 is about 50 Hz to 500 Hz. On the other hand, the size of the transformer 13 can be reduced as the frequency is higher due to the magnetic flux density. Considering these, the AC frequency output by the inverter 12 is preferably about 300 Hz to 500 Hz.

（定常時の動作）
次に、ＵＶランプが点灯し、定常状態になっているときのインバータ１２の動作について説明する。インバータ１２は、トランス１３の前記一次側を流れるトランス電流が交互に順方向と逆方向に流れるようにスイッチングし、且つ前記トランス電流が順方向に流れているとき又は逆方向に流れているときに前記トランス電流の電流値に脈流を与えるようにスイッチングし、一定の電力が前記負荷に供給されるように定電力制御を行うことを特徴とする。 (Operation in steady state)
Next, the operation of the inverter 12 when the UV lamp is lit and is in a steady state will be described. The inverter 12 switches so that the transformer current flowing through the primary side of the transformer 13 alternately flows in the forward direction and the reverse direction, and when the transformer current is flowing in the forward direction or in the reverse direction. It is characterized in that switching is performed so as to give a pulsating flow to the current value of the transformer current, and constant power control is performed so that a constant power is supplied to the load.

図４は、ＵＶランプが定常状態になっているときのトランス電流ｉＬの波形を説明する図である。インバータ１２は、ＵＶランプが定常状態になっているとき、トランス電流ｉＬが図４のような波形となるようにスイッチ（ＳＷ Ａ〜Ｄ）を低周波スイッチング制御（例５００Ｈｚ）と高周波スイッチング制御（例５０ｋＨｚ）を組み合わせてオンオフ制御する。 FIG. 4 is a diagram illustrating a waveform of a transformer current iL when the UV lamp is in a steady state. In the inverter 12, the switches (SW A to D) are controlled by low frequency switching (eg 500 Hz) and high frequency switching (eg, 500 Hz) so that the transformer current iL has the waveform shown in FIG. 4 when the UV lamp is in the steady state. Example 50kHz) is combined to control on / off.

インバータ１２は、高周波スイッチング制御を行うとき、トランス電流を一方向に流しつつ、５０ｋＨｚ程度の脈流が発生するようにスイッチングを行う。例えば、インバータ１２は、スイッチＳＷ ＡとＤもしくはＢとＣがオンの期間（電圧印加期間）を４μ秒、スイッチＳＷ ＡとＣもしくはＢとＤがオンの期間（還流期間）を１６μ秒とする。 When performing high-frequency switching control, the inverter 12 switches so that a pulsating current of about 50 kHz is generated while flowing a transformer current in one direction. For example, in the inverter 12, the period when the switches SW A and D or B and C are on (voltage application period) is 4 μsec, and the period when the switches SW A and C or B and D are on (reflux period) is 16 μsec. ..

インバータ１２は、低周波スイッチング制御を行うとき、トランス電流の方向が５００Ｈｚ程度で逆転するようにスイッチングを行う。例えば、インバータ１２は、電圧印加期間を１００μ秒とすることでトランス電流の方向を逆転させることができる。なお、インバータ１２は、電圧印加期間と次の電圧印加期間との間で上述した高周波スイッチング制御が行う。 When performing low frequency switching control, the inverter 12 switches so that the direction of the transformer current is reversed at about 500 Hz. For example, the inverter 12 can reverse the direction of the transformer current by setting the voltage application period to 100 μsec. The inverter 12 performs the high-frequency switching control described above between the voltage application period and the next voltage application period.

本実施形態の交流出力電源は、高周波スイッチング制御が入っているため、従来のサイリスタによる低周波（５０〜６０Ｈｚ程度）のみの交流出力電源に比べ、入力や負荷変動に対する応答、あるいは出力指令に対して高速に応答することができる。また、本実施形態の交流出力電源は、異常時の過電力、過電圧、ないし過電流が発生したときも高速に停止させたり、保護することができる。 Since the AC output power supply of the present embodiment includes high-frequency switching control, it responds to input and load fluctuations or outputs commands as compared with the conventional AC output power supply having only a low frequency (about 50 to 60 Hz) by a thyristor. Can respond at high speed. Further, the AC output power supply of the present embodiment can be stopped or protected at high speed even when an overpower, an overvoltage, or an overcurrent occurs at an abnormal time.

（起動時の動作１）
続いて、ＵＶランプを点灯するときのインバータ１２の動作について説明する。インバータ１２は、負荷２２に定常時より高い電圧を印加するとき（起動時）、変換した交流の周波数を前記定常時の周波数から、前記インバータと前記トランスとの間を接続するインダクタンス手段Ｌ１を有する回路２１に含まれるインダクタンス成分と容量Ｃとの共振周波数へ近づけ、所望の電圧がトランス１３の二次側から出力されるようにスイッチングする定電圧制御を行う。容量Ｃは、コンデンサ等の部品や他の部品に内蔵される容量成分、又はその組み合わせであってもよい。 (Operation at startup 1)
Subsequently, the operation of the inverter 12 when the UV lamp is turned on will be described. The inverter 12 has an inductance means L1 that connects the converted AC frequency from the steady-state frequency to between the inverter and the transformer when a voltage higher than the steady state is applied to the load 22 (at startup). Constant voltage control is performed to bring the inductance component included in the circuit 21 closer to the resonance frequency of the capacitance C and switch so that a desired voltage is output from the secondary side of the transformer 13. The capacitance C may be a component such as a capacitor, a capacitance component built in another component, or a combination thereof.

ＵＶランプが冷えている場合、ＵＶランプを点灯（着火＝イグニッション）させるために定常時より高電圧が必要となる。例えば、定常時トランス１３の二次側で８００Ｖの出力電圧が必要である場合、点灯時には１５００Ｖが必要となる。本実施形態の交流出力電源は、トランス電流の周波数を、インダクタンス手段Ｌ１を有する回路２１内のインダクタンスＬと容量Ｃとによって求められる共振周波数（ｆ＝１／（２π√（ＬＣ））に近づけるようにインバータ１２のスイッチングを制御する。トランス電流の周波数を共振周波数を近づける（例２０ｋＨｚ）ことで、トランス１３の巻数比を上げることなく共振効果により所望の高電圧を発生させることができる。本実施形態の交流出力電源は、ＵＶランプが着火するまで一定の高電圧を印加することができる（定電圧制御）。 When the UV lamp is cold, a higher voltage than the steady state is required to turn on the UV lamp (ignition = ignition). For example, when an output voltage of 800 V is required on the secondary side of the steady-state transformer 13, 1500 V is required at the time of lighting. The AC output power supply of the present embodiment brings the frequency of the transformer current close to the resonance frequency (f = 1 / (2π√ (LC)) obtained by the inductance L and the capacitance C in the circuit 21 having the inductance means L1. By controlling the switching of the inverter 12 to bring the frequency of the transformer current closer to the resonance frequency (eg 20 kHz), a desired high voltage can be generated by the resonance effect without increasing the turns ratio of the transformer 13. The AC output power supply of the form can apply a constant high voltage until the UV lamp ignites (constant voltage control).

（起動時の動作２）
続いて、ＵＶランプを着火直後のインバータ１２の動作について説明する。インバータ１２は、負荷２２のインピーダンスが定常時より低下したとき（着火直後）に、インダクタンス手段を有する回路２１に存在するインダクタンス手段Ｌ１に対して電圧が順方向に印加される時間と逆方向に印加される時間を調整し、所望の電流がトランス１３の二次側から出力されるようにスイッチングする定電流制御を行うことを特徴とする。 (Operation at startup 2)
Subsequently, the operation of the inverter 12 immediately after the UV lamp is ignited will be described. When the impedance of the load 22 is lower than the steady state (immediately after ignition), the inverter 12 applies the voltage to the inductance means L1 existing in the circuit 21 having the inductance means in the direction opposite to the time when the voltage is applied in the forward direction. It is characterized in that constant current control is performed by adjusting the time to be performed and switching so that a desired current is output from the secondary side of the transformer 13.

ＵＶランプは着火直後にインピーダンスが極めて小さくなる特性を有する。インバータ１２が負荷のインピーダンスが極めて小さい期間に前述の定常時の制御（図４）を行うと大電流が流れる恐れがある。このような場合、インバータ１２は、高周波スイッチング制御時に位相シフト制御を行い、定電流制御を行う。図５（Ａ）は、インバータ１２が行う定電流制御時のトランス電流ｉＬの波形を説明する図である。図５（Ｂ）は、区間３５のトランス電流ｉＬの波形を拡大した図である。 The UV lamp has a characteristic that the impedance becomes extremely small immediately after ignition. If the inverter 12 performs the above-mentioned steady-state control (FIG. 4) while the load impedance is extremely small, a large current may flow. In such a case, the inverter 12 performs phase shift control and constant current control during high frequency switching control. FIG. 5A is a diagram illustrating a waveform of a transformer current iL during constant current control performed by the inverter 12. FIG. 5B is an enlarged view of the waveform of the transformer current iL in the section 35.

位相シフト制御では、インダクタＬに正電圧がかかる正電圧期間Ｔ１と負電圧がかかる負電圧期間Ｔ２を制御することができる。例えば、スイッチＳＷ ＡとＤが同時にオンの期間を正電圧期間Ｔ１、スイッチＳＷ ＢとＣが同時にオンの期間を負電圧期間Ｔ２とすれば、正電圧期間Ｔ１を拡張することでトランス電流を増加、負電圧期間Ｔ２を拡張することでトランス電流を減少させることができる（図５（Ｂ）参照。）。このように、インバータ１２が正電圧期間Ｔ１と負電圧期間Ｔ２を調整することで負荷２２のインピーダンスが極めて小さい期間においても定電流制御を行うことができる。 In the phase shift control, it is possible to control a positive voltage period T1 in which a positive voltage is applied to the inductor L and a negative voltage period T2 in which a negative voltage is applied. For example, if the period in which the switches SW A and D are on at the same time is the positive voltage period T1 and the period in which the switches SW B and C are on at the same time is the negative voltage period T2, the transformer current is increased by extending the positive voltage period T1. , The transformer current can be reduced by extending the negative voltage period T2 (see FIG. 5 (B)). In this way, by adjusting the positive voltage period T1 and the negative voltage period T2 by the inverter 12, constant current control can be performed even during a period in which the impedance of the load 22 is extremely small.

（ＵＶランプの点灯動作）
負荷２２がＵＶランプであるときのインバータ１２は次のように動作する。インバータ１２は、ＵＶランプの着火前は前記定電圧制御を行い、ＵＶランプの着火直後は前記定電流制御を行い、ＵＶランプの着火し、一定時間が経過した後は前記定電力制御を行う。 (UV lamp lighting operation)
When the load 22 is a UV lamp, the inverter 12 operates as follows. The inverter 12 performs the constant voltage control before the ignition of the UV lamp, the constant current control immediately after the ignition of the UV lamp, the ignition of the UV lamp, and the constant power control after a certain period of time elapses.

インバータ１２は、定電圧制御から定電流制御へ、定電流制御から定電力制御へは、予め決められた時間で移行してもよい。例えば、インバータ１２は、８００Ｖでの定電圧制御を１０ｍ秒継続した後、５０Ａでの定電流制御へ移行し、５０Ａの定電流制御を１０ｍ秒継続した後、１０ｋＷでの定電流制御へ移行する。 The inverter 12 may shift from constant voltage control to constant current control and from constant current control to constant power control at a predetermined time. For example, the inverter 12 continues constant voltage control at 800 V for 10 msec and then shifts to constant current control at 50 A, and after continuing constant current control at 50 A for 10 msec, shifts to constant current control at 10 kW. ..

また、負荷２２への電流や電圧、あるいはトランス電流やトランス１３の一次側の電圧を計測器（不図示）でモニタし、インバータ１２は、モニタされた値によって定電圧制御から定電流制御へ、定電流制御から定電力制御へ移行してもよい。 Further, the current and voltage to the load 22 or the transformer current and the voltage on the primary side of the transformer 13 are monitored by a measuring instrument (not shown), and the inverter 12 changes from constant voltage control to constant current control according to the monitored value. The constant current control may be shifted to the constant power control.

１０：入力される交流
１１：整流器
１２：インバータ
１３：トランス
１４：整流器
１５：インバータ
１９：出力される交流
２１：インダクタンス手段を有する回路
２２：負荷
２３：電源出力端と負荷までの配線
２４：電源出力端 10: Input AC 11: Rectifier 12: Inverter 13: Transformer 14: Rectifier 15: Inverter 19: Output AC 21: Circuit with inductance means 22: Load 23: Power supply output end and wiring to load 24: Power supply Output end

Claims (7)

入力される交流を直流に整流する整流器と、
前記整流器からの直流を前記入力される交流より周波数が高い交流に変換するインバータと、
一次側と二次側とが絶縁しており、前記一次側に入力された交流を前記二次側に直接接続される負荷に出力するトランスと、
前記インバータが変換した交流を前記トランスの前記一次側に入力するインダクタンス手段を有する回路と、
を備える交流出力電源。 A rectifier that rectifies the input alternating current to direct current,
An inverter that converts direct current from the rectifier into alternating current with a higher frequency than the input alternating current,
A transformer in which the primary side and the secondary side are insulated and the alternating current input to the primary side is output to a load directly connected to the secondary side.
A circuit having an inductance means that inputs the alternating current converted by the inverter to the primary side of the transformer, and
AC output power supply with. 入力される交流を直流に整流する整流器と、
前記整流器からの直流を前記入力される交流より周波数が高い交流に変換するインバータと、
一次側に入力された交流を二次側に直接接続される非接地の負荷に出力する単巻巻線型のトランスと、
前記インバータが変換した交流を前記トランスの前記一次側に入力するインダクタンス手段を有する回路と、
を備える交流出力電源。 A rectifier that rectifies the input alternating current to direct current,
An inverter that converts direct current from the rectifier into alternating current with a higher frequency than the input alternating current,
A single-winding type transformer that outputs the AC input to the primary side to an ungrounded load directly connected to the secondary side,
A circuit having an inductance means that inputs the alternating current converted by the inverter to the primary side of the transformer, and
AC output power supply with. 前記インバータは、前記変換した交流の周波数が３００Ｈｚ以上５００Ｈｚ以下となるようにスイッチングすることを特徴とする請求項１又は２に記載の交流出力電源。 The AC output power supply according to claim 1 or 2, wherein the inverter switches so that the frequency of the converted AC is 300 Hz or more and 500 Hz or less. 前記インバータは、前記トランスの前記一次側を流れるトランス電流が交互に順方向と逆方向に流れるようにスイッチングし、且つ前記トランス電流が順方向に流れているとき又は逆方向に流れているときに前記トランス電流の電流値に脈流を与えるようにスイッチングし、一定の電力が前記負荷に供給されるように定電力制御を行うことを特徴とする請求項１から３のいずれかに記載の交流出力電源。 The inverter switches so that the transformer current flowing through the primary side of the transformer alternately flows in the forward direction and the reverse direction, and when the transformer current flows in the forward direction or in the reverse direction. The alternating current according to any one of claims 1 to 3, wherein the current value of the transformer current is switched so as to give a pulsating current, and constant power control is performed so that a constant power is supplied to the load. Output power supply. 前記インバータは、前記負荷に定常時より高い電圧を印加するとき、前記変換した交流の周波数を前記定常時の周波数から前記インダクタンス手段を有する回路の共振周波数へ近づけ、所望の電圧が前記トランスの前記二次側から出力されるようにスイッチングする定電圧制御を行うことを特徴とする請求項１から４のいずれかに記載の交流出力電源。 When a voltage higher than the steady state is applied to the load, the inverter brings the converted AC frequency closer to the resonance frequency of the circuit having the inductance means from the steady state frequency, and the desired voltage is the said of the transformer. The AC output power supply according to any one of claims 1 to 4, wherein constant voltage control for switching so as to be output from the secondary side is performed. 前記インバータは、前記負荷のインピーダンスが定常時より低下したときに、前記インバータと前記トランスとの間に接続される前記インダクタンス手段を有する回路に存在する前記インダクタンス手段に対して電圧が順方向に印加される時間と逆方向に印加される時間を調整し、所望の電流が前記トランスの前記二次側から出力されるようにスイッチングする定電流制御を行うことを特徴とする請求項１から５のいずれかに記載の交流出力電源。 In the inverter, when the impedance of the load is lower than the steady state, a voltage is applied in the forward direction to the inductance means existing in the circuit having the inductance means connected between the inverter and the transformer. Claims 1 to 5, wherein the constant current control is performed by adjusting the time applied in the direction opposite to the time to be applied and switching so that a desired current is output from the secondary side of the transformer. The AC output power supply described in either. 前記負荷がＵＶランプであるとき、
前記インバータは、前記ＵＶランプの着火前は前記定電圧制御を行い、前記ＵＶランプの着火直後は前記定電流制御を行い、前記ＵＶランプの着火し、一定時間が経過した後は前記定電力制御を行うことを特徴とする請求項６に記載の交流出力電源。 When the load is a UV lamp
The inverter performs the constant voltage control before the ignition of the UV lamp, the constant current control immediately after the ignition of the UV lamp, the ignition of the UV lamp, and the constant power control after a certain period of time elapses. The AC output power source according to claim 6, further comprising the above.
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