JP5366326B2 - Power supply - Google Patents

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JP5366326B2
JP5366326B2 JP2010145239A JP2010145239A JP5366326B2 JP 5366326 B2 JP5366326 B2 JP 5366326B2 JP 2010145239 A JP2010145239 A JP 2010145239A JP 2010145239 A JP2010145239 A JP 2010145239A JP 5366326 B2 JP5366326 B2 JP 5366326B2
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伸吾 内藤
均 森
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Nichicon Capacitor Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device capable of suppressing vibration of an output voltage, which is caused by variation of a conductive state of a switch element, with a comparatively simple structure. <P>SOLUTION: A power supply device 1a has: a switching part 2a configured by connecting switch elements Q1-Q4 in a single phase full bridge configuration; a resonance part 3 consisting of series reactors L1 and L2 and an interline capacitor C; and a controller 4a. The controller 4a carries out switching so that the conductive states of switch elements (e.g. Q1 and Q2) included in the same arm have a phase opposite to each other, and carries out switching so that the conductive states of the switch elements (e.g. Q1 and Q2) included in one arm and switch elements (e.g. Q3 and Q4) included in the other arm have a predetermined time difference. Thereby, the switching part 2a is sequentially switched in four states where the conductive states of the switch elements Q1-Q4 are different from each other. The predetermined time difference is one-half of a resonance cycle of the resonance part 3. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

本発明は、直列リアクトルと線間コンデンサとからなる共振部を備えた電源装置に関する。   The present invention relates to a power supply device including a resonating unit including a series reactor and a line capacitor.

直列リアクトルと線間コンデンサとからなる共振部を備えた従来の電源装置として、図８に示す電源装置１ｃが知られている（例えば、特許文献１参照）。
同図に示すように、電源装置１ｃは、スイッチング部２ｃと、その出力側に設けられた共振部３と、スイッチング部２ｃを制御する制御部４ｃとを備え、スイッチング部２ｃで得た中間電圧Ｖ２による交流電力を、共振部３を通じて負荷６に供給する。 A power supply device 1c shown in FIG. 8 is known as a conventional power supply device provided with a resonance unit composed of a series reactor and a line capacitor (see, for example, Patent Document 1).
As shown in the figure, the power supply device 1c includes a switching unit 2c, a resonance unit 3 provided on the output side thereof, and a control unit 4c for controlling the switching unit 2c, and an intermediate voltage obtained by the switching unit 2c. AC power by V2 is supplied to the load 6 through the resonance unit 3.

スイッチング部２ｃは、スイッチ素子とダイオードとの逆並列回路４組を単相ブリッジ接続したもので、制御部４ｃの制御下で各スイッチ素子の導通状態（オン／オフ）が切り替えられることにより、外部直流電源５によって供給されるＥ［Ｖ］の直流電圧を交流の中間電圧Ｖ２に変換する。
また、制御部４ｃは、負荷６に流れる電流の零点位相と共振部３の共振周期とを考慮して、各スイッチ素子の導通状態を変化させるタイミングを決定する。 The switching unit 2c is a four-phase anti-parallel circuit composed of switching elements and diodes connected in a single-phase bridge. When the switching state of each switching element (on / off) is switched under the control of the control unit 4c, The DC voltage of E [V] supplied by the DC power source 5 is converted into an AC intermediate voltage V2.
Further, the control unit 4 c determines the timing for changing the conduction state of each switch element in consideration of the zero point phase of the current flowing through the load 6 and the resonance period of the resonance unit 3.

特開２０００−２９５８５７号公報JP 2000-295857 A

上記の電源装置１ｃによれば、スイッチ素子の導通状態が切り替わる際に発生する出力電圧Ｖ３の振動を抑制することができ、当該振動に起因する電磁誘導障害や熱損失の発生、および電力変換効率の低下を防ぐことができる。
しかしながら、上記の電源装置１ｃは、制御部４ｃによるスイッチ素子の制御が複雑であり、より簡易な制御で同等の効果を得ることができる電源装置が望まれていた。 According to the power supply device 1c described above, vibration of the output voltage V3 generated when the conduction state of the switch element is switched can be suppressed, generation of electromagnetic induction failure and heat loss due to the vibration, and power conversion efficiency. Can be prevented.
However, in the power supply device 1c described above, the control of the switch element by the control unit 4c is complicated, and a power supply device that can obtain the same effect with simpler control has been desired.

本発明は上記事情に鑑みてなされたものであって、その課題とするところは、比較的簡易な構成で、スイッチ素子の導通状態の変化に伴う出力電圧の振動を抑制することができる電源装置を提供することにある。   The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a power supply device capable of suppressing oscillation of an output voltage accompanying a change in the conduction state of a switch element with a relatively simple configuration. Is to provide.

上記課題を解決するために、本発明の第１発明に係る電源装置は、
第１〜第４スイッチ素子からなる４つのスイッチ素子を単相フルブリッジ接続し、一方のアームを第１および第２スイッチ素子から構成し、他方のアームを第３および第４スイッチ素子から構成するとともに、第１〜第４スイッチ素子の各々に第１〜第４ダイオードを逆並列接続し、４つのスイッチ素子を用いて入力直流電力をスイッチングするスイッチング部と、スイッチング部の出力側に接続され、直列リアクトルおよび線間コンデンサからなる共振部と、４つのスイッチ素子の導通状態を各々切り替える制御部とを備え、スイッチング部で得た交流電力を、共振部を通じて負荷に供給する電源装置であって、
上記制御部の制御下で第１および第２スイッチ素子の導通状態の切り替えタイミングに対して、第３および第４スイッチ素子の導通状態の切り替えタイミングを、直列リアクトルおよび線間コンデンサの共振周期の１／２だけずらすことにより、
（１）第１スイッチ素子をオン、第２スイッチ素子をオフにした状態で、第３スイッチ素子をオフ、第４スイッチ素子をオンにし、入力直流電力を第１および第４スイッチ素子を介して負荷に向けて供給する第１モードと、
（２）第３スイッチ素子をオフ、第４スイッチ素子をオンにした状態で、第１スイッチ素子をオフ、第２スイッチ素子をオンにし、負荷電流を第４スイッチ素子および第２ダイオードからなる経路で還流させる第２モードと、
（３）第１スイッチ素子をオフ、第２スイッチ素子をオンにした状態で、第３スイッチ素子をオン、第４スイッチ素子をオフにし、入力直流電力を第２および第３スイッチ素子を介して負荷に向けて供給する第３モードと、
（４）第３スイッチ素子をオン、第４スイッチ素子をオフにした状態で、第１スイッチ素子をオン、第２スイッチ素子をオフにし、負荷電流を第１スイッチ素子および第４ダイオードからなる経路で還流させる第４モードと
に順次切り替わることを特徴としている。 In order to solve the above-described problem, a power supply device according to the first invention of the present invention provides:
Four switch elements including the first to fourth switch elements are connected in a single-phase full bridge, one arm is composed of the first and second switch elements, and the other arm is composed of the third and fourth switch elements. In addition, the first to fourth diodes are connected in reverse parallel to each of the first to fourth switch elements, and the switching unit that switches the input DC power using the four switch elements, and is connected to the output side of the switching unit, A power supply device including a resonance unit including a series reactor and a line-to-line capacitor, and a control unit that switches each of the conduction states of the four switch elements, and supplying AC power obtained by the switching unit to a load through the resonance unit,
Under the control of the control unit, with respect to the switching timing of the conduction state of the first and second switch elements, the switching timing of the conduction state of the third and fourth switch elements is set to 1 of the resonance period of the series reactor and the line capacitor. By shifting by / 2,
(1) With the first switch element turned on and the second switch element turned off, the third switch element is turned off, the fourth switch element is turned on, and the input DC power is passed through the first and fourth switch elements. A first mode for supplying to the load;
(2) In a state where the third switch element is turned off and the fourth switch element is turned on, the first switch element is turned off, the second switch element is turned on, and the load current is made up of the fourth switch element and the second diode. A second mode of refluxing with
(3) With the first switch element turned off and the second switch element turned on, the third switch element is turned on, the fourth switch element is turned off, and the input DC power is passed through the second and third switch elements. A third mode for supplying the load,
(4) In a state where the third switch element is turned on and the fourth switch element is turned off, the first switch element is turned on, the second switch element is turned off, and the load current is made up of the first switch element and the fourth diode. It is characterized by sequentially switching to the fourth mode for refluxing.

また、上記課題を解決するために、本発明の第２発明に係る電源装置は、
第１直流電源と第１スイッチ素子とを含む第１チョッパ回路と、第２直流電源と第２スイッチ素子とを含む第２チョッパ回路とを直列接続してなり、各チョッパ回路の出力電圧の和電圧を負荷に対して出力するスイッチング部と、スイッチング部の出力側に接続され、直列リアクトルおよび線間コンデンサからなる共振部と、第１および第２スイッチ素子の導通状態を各々切り替える制御部とを備え、和電圧による電力を、共振部を通じて負荷に供給する電源装置であって、
上記制御部の制御下で第１スイッチ素子の導通状態の切り替えタイミングに対して、第２スイッチ素子の導通状態の切り替えタイミングを、直列リアクトルおよび線間コンデンサの共振周期の１／２だけずらすことにより、
（１）第１スイッチ素子をオンにした状態で、第２スイッチ素子をオンにし、第１直流電源からの直流電圧と第２直流電源からの直流電圧との和電圧を負荷に向けて供給する第１モードと、
（２）第２スイッチ素子をオンにした状態で、第１スイッチ素子をオフにし、第２直流電源からの直流電圧を負荷に向けて供給する第２モードと、
（３）第１スイッチ素子をオフにした状態で、第２スイッチ素子をオフにし、負荷に対する電圧供給を停止する第３モードと、
（４）第２スイッチ素子をオフにした状態で、第１スイッチ素子をオンにし、第１直流電源からの直流電圧を負荷に向けて供給する第４モードと
に順次切り替わることを特徴としている。 In order to solve the above-described problem, a power supply device according to the second invention of the present invention provides:
A first chopper circuit including a first DC power supply and a first switch element and a second chopper circuit including a second DC power supply and a second switch element are connected in series, and the sum of output voltages of the respective chopper circuits. A switching unit that outputs a voltage to a load; a resonance unit that is connected to the output side of the switching unit and includes a series reactor and a line capacitor; and a control unit that switches between the conduction states of the first and second switch elements. A power supply device for supplying power by a sum voltage to a load through a resonance unit,
By shifting the conduction timing of the second switch element with respect to the switching timing of the conduction state of the first switch element under the control of the control unit by a half of the resonance period of the series reactor and the line capacitor. ,
(1) With the first switch element turned on, the second switch element is turned on, and the sum voltage of the DC voltage from the first DC power supply and the DC voltage from the second DC power supply is supplied to the load. The first mode;
(2) a second mode in which the first switch element is turned off and the DC voltage from the second DC power source is supplied to the load while the second switch element is turned on;
(3) a third mode in which, with the first switch element turned off, the second switch element is turned off and the voltage supply to the load is stopped;
(4) In the state where the second switch element is turned off, the first switch element is turned on, and the mode is sequentially switched to the fourth mode in which the DC voltage from the first DC power supply is supplied to the load.

上記第１発明および第２発明の構成では、スイッチング部から出力される電圧が少なくとも２つの電圧値（高電圧値／低電圧値）とその中間の電圧値をとる。そして、高電圧値と低電圧値との間で電圧値が変化する際に、スイッチング部から出力される電圧は共振周期の１／２の時間だけ必ず中間の電圧値をとる。
つまり、上記構成では、スイッチング部から出力される電圧が２段階のステップ状に変化し、１段階目の変化により出力電圧に発生する振動と２段階目の変化により出力電圧に発生する振動が逆位相となって互いに打ち消し合う。
したがって、上記構成によれば、比較的簡易な構成で、出力電圧の振動を抑制することができる。 In the configurations of the first invention and the second invention, the voltage output from the switching unit takes at least two voltage values (high voltage value / low voltage value) and an intermediate voltage value therebetween. And when a voltage value changes between a high voltage value and a low voltage value, the voltage output from a switching part always takes an intermediate voltage value only for the time of 1/2 of a resonance period.
That is, in the above configuration, the voltage output from the switching unit changes in two steps, and the vibration generated in the output voltage due to the change in the first step and the vibration generated in the output voltage due to the change in the second step are reversed. The phases cancel each other.
Therefore, according to the above configuration, the oscillation of the output voltage can be suppressed with a relatively simple configuration.

本発明によれば、比較的簡易な構成で、スイッチ素子の導通状態の変化に伴う出力電圧の変動を抑制することができる電源装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the power supply device which can suppress the fluctuation | variation of the output voltage accompanying the change of the conduction | electrical_connection state of a switch element with a comparatively simple structure can be provided.

本発明の第１実施形態に係る電源装置の回路図である。1 is a circuit diagram of a power supply device according to a first embodiment of the present invention. 第１実施形態に係る電源装置の動作を説明するための波形図である。It is a wave form diagram for demonstrating operation | movement of the power supply device which concerns on 1st Embodiment. 図２に示す第１モード〜第４モードの４つの状態を示す回路図である。FIG. 3 is a circuit diagram showing four states of a first mode to a fourth mode shown in FIG. 2. 第１実施形態に係る電源装置の動作原理を説明するための波形図である。It is a wave form diagram for demonstrating the operation principle of the power supply device which concerns on 1st Embodiment. （Ａ）は第１実施形態に係る電源装置の出力電圧波形図、（Ｂ）（Ｃ）は時間差Δｔを適正値からずらした場合の出力電圧波形図である。(A) is an output voltage waveform diagram of the power supply device according to the first embodiment, and (B) and (C) are output voltage waveform diagrams when the time difference Δt is shifted from an appropriate value. 本発明の第２実施形態に係る電源装置の回路図である。It is a circuit diagram of the power supply device which concerns on 2nd Embodiment of this invention. 第２実施形態に係る電源装置の動作を説明するための波形図である。It is a wave form diagram for demonstrating operation | movement of the power supply device which concerns on 2nd Embodiment. 従来の電源装置のブロック図である。It is a block diagram of the conventional power supply device.

以下、添付図面を参照して、本発明に係る電源装置の好ましい実施形態について説明する。   Hereinafter, a preferred embodiment of a power supply device according to the present invention will be described with reference to the accompanying drawings.

［第１実施形態］
図１に、本発明の第１実施形態に係る電源装置を示す。
同図に示すように、電源装置１ａは、外部直流電源５から供給されるＥ［Ｖ］の直流電圧を交流の中間電圧Ｖ２に変換するスイッチング部２ａと、その出力側に設けられた共振部３と、スイッチング部２ａを制御する制御部４ａとを備え、スイッチング部２ａで得た中間電圧Ｖ２による交流電力を、共振部３を通じて負荷６に供給する。
電源装置１ａは種々の分野で利用可能であるが、例えば、物理学研究やがん治療の目的で使用される荷電粒子加速器の電源として利用することができる。 [First Embodiment]
FIG. 1 shows a power supply device according to a first embodiment of the present invention.
As shown in the figure, a power supply device 1a includes a switching unit 2a that converts a DC voltage of E [V] supplied from an external DC power source 5 into an AC intermediate voltage V2, and a resonance unit provided on the output side thereof. 3 and a control unit 4a that controls the switching unit 2a, and supplies AC power from the intermediate voltage V2 obtained by the switching unit 2a to the load 6 through the resonance unit 3.
Although the power supply device 1a can be used in various fields, for example, it can be used as a power supply for a charged particle accelerator used for the purpose of physics research or cancer treatment.

スイッチング部２ａは、ＩＧＢＴ等からなる４つのスイッチ素子Ｑ１〜Ｑ４を単相ブリッジ接続したもので、第１スイッチ素子Ｑ１および第２スイッチ素子Ｑ２が第１アームを構成し、第３スイッチ素子Ｑ３および第４スイッチ素子Ｑ４が第２アームを構成する。また、各スイッチ素子Ｑ１〜Ｑ４にはダイオードＤ１〜Ｄ４が逆並列接続されている。例えば、第１スイッチ素子Ｑ１のエミッタには第１ダイオードＤ１のアノードが接続され、第１スイッチ素子のコレクタには第１ダイオードのカソードが接続されている。   The switching unit 2a is a single-phase bridge connection of four switch elements Q1 to Q4 made of IGBT or the like. The first switch element Q1 and the second switch element Q2 constitute a first arm, and the third switch element Q3 and The fourth switch element Q4 constitutes the second arm. In addition, diodes D1 to D4 are connected in reverse parallel to the switch elements Q1 to Q4. For example, the anode of the first diode D1 is connected to the emitter of the first switch element Q1, and the cathode of the first diode is connected to the collector of the first switch element.

各スイッチ素子Ｑ１〜Ｑ４のベースは制御部４ａに接続され、制御部４ａの制御下でベースの電圧が変化することで、各スイッチ素子Ｑ１〜Ｑ４の導通状態が切り替わり、中間電圧Ｖ２が変化する。
例えば、第１スイッチ素子Ｑ１と第４スイッチ素子Ｑ４をオン状態とし、第２スイッチ素子Ｑ２と第３スイッチ素子Ｑ３をオフ状態とした場合（後述する第１モード）、中間電圧Ｖ２はＥ［Ｖ］（高電圧値）となる。
また、第２スイッチ素子Ｑ２と第３スイッチ素子Ｑ３をオン状態とし、第１スイッチ素子Ｑ１と第４スイッチ素子Ｑ４をオフ状態とした場合（後述する第３モード）、中間電圧Ｖ２は−Ｅ［Ｖ］（低電圧値）となる。 The bases of the switch elements Q1 to Q4 are connected to the control unit 4a. When the base voltage changes under the control of the control unit 4a, the conduction states of the switch elements Q1 to Q4 are switched and the intermediate voltage V2 changes. .
For example, when the first switch element Q1 and the fourth switch element Q4 are turned on and the second switch element Q2 and the third switch element Q3 are turned off (first mode to be described later), the intermediate voltage V2 is E [V ] (High voltage value).
Further, when the second switch element Q2 and the third switch element Q3 are turned on and the first switch element Q1 and the fourth switch element Q4 are turned off (a third mode described later), the intermediate voltage V2 is −E [ V] (low voltage value).

共振部３は、第１アームと負荷６とを繋ぐラインに介装された直列リアクトルＬ１と、第２アームと負荷６とを繋ぐラインに介装された直列リアクトルＬ２と、負荷６と並列となるように両ライン間に接続された線間コンデンサＣとからなる。
直列リアクトルＬ１、Ｌ２のインダクタンス値をＬｓ、線間コンデンサＣのコンダクタンス値をＣｓとすると、共振部３の共振周期Ｔｓは次式で求めることができる。

Figure 0005366326
The resonating unit 3 includes a series reactor L1 interposed in a line connecting the first arm and the load 6, a series reactor L2 interposed in a line connecting the second arm and the load 6, and the load 6 in parallel. The line capacitor C is connected between the two lines.
When the inductance values of the series reactors L1 and L2 are Ls, and the conductance value of the line capacitor C is Cs, the resonance period Ts of the resonance unit 3 can be obtained by the following equation.
Figure 0005366326

制御部４ａは、電流センサ７で検出された負荷６の通流電流（負荷電流）を参照しつつ、各スイッチ素子Ｑ１〜Ｑ４の導通状態を切り替える。制御部４ａは、マイコンおよび該マイコン上で実行されるコンピュータプログラム等で構成されている。   The control unit 4a switches the conduction states of the switch elements Q1 to Q4 while referring to the flow current (load current) of the load 6 detected by the current sensor 7. The control unit 4a includes a microcomputer and a computer program executed on the microcomputer.

図２は、各スイッチ素子Ｑ１〜Ｑ４の導通状態と、中間電圧Ｖ２および負荷６に供給される出力電圧Ｖ３との関係を示した図である。
同図に示すように、第１アームを構成する第１および第２スイッチ素子Ｑ１、Ｑ２は、逆位相となるように導通状態が切り替えられる。つまり、第１スイッチ素子Ｑ１のオン状態からオフ状態（オフ状態からオン状態）への切り替えと、第２スイッチ素子Ｑ２のオフ状態からオン状態（オン状態からオフ状態）への切り替えが同時に行われる。
同様に、第２アームを構成する第３および第４スイッチ素子Ｑ３、Ｑ４も逆位相となるように導通状態が切り替えられ、第３スイッチ素子Ｑ３のオン状態からオフ状態（オフ状態からオン状態）への切り替えと、第４スイッチ素子Ｑ４のオフ状態からオン状態（オン状態からオフ状態）への切り替えも同時に行われる。 FIG. 2 is a diagram showing the relationship between the conduction state of each switch element Q1 to Q4 and the intermediate voltage V2 and the output voltage V3 supplied to the load 6. In FIG.
As shown in the figure, the conduction states of the first and second switch elements Q1, Q2 constituting the first arm are switched so as to be in opposite phases. That is, the switching of the first switch element Q1 from the ON state to the OFF state (OFF state to ON state) and the switching of the second switch element Q2 from the OFF state to the ON state (ON state to OFF state) are performed simultaneously. .
Similarly, the conductive state is switched so that the third and fourth switch elements Q3 and Q4 constituting the second arm are also in opposite phases, and the third switch element Q3 is switched from the on state to the off state (from the off state to the on state). And switching from the off state to the on state (on state to off state) of the fourth switch element Q4 is also performed at the same time.

また、第１アームを構成する第１および第２スイッチ素子Ｑ１、Ｑ２の導通状態と、第２アームを構成する第３および第４スイッチ素子Ｑ３、Ｑ４の導通状態は、Δｔだけ時間差をつけて切り替えられる。
時間差Δｔは共振部３の共振周期Ｔｓの１／２であり、具体的には、次式で表される。

Figure 0005366326
Further, the conduction state of the first and second switch elements Q1 and Q2 constituting the first arm and the conduction state of the third and fourth switch elements Q3 and Q4 constituting the second arm are delayed by Δt. Can be switched.
The time difference Δt is ½ of the resonance period Ts of the resonance unit 3, and is specifically expressed by the following expression.
Figure 0005366326

制御部４ａの制御下で各スイッチ素子Ｑ１〜Ｑ４の導通状態が切り替わることにより、結局、スイッチング部２ａは図３に示す４つの状態に順次切り替えられる。
すなわち、スイッチング部２ａは、
（１）第１スイッチ素子Ｑ１をオン、第２スイッチ素子Ｑ２をオフにした状態で、第３スイッチ素子Ｑ３をオフ、第４スイッチ素子Ｑ４をオンにし、外部直流電源５の電力を第１および第４スイッチ素子Ｑ１、Ｑ４を介して負荷６に向けて供給する第１モード（図３（Ａ））と、
（２）第３スイッチ素子Ｑ３をオフ、第４スイッチ素子Ｑ４をオンにした状態で、第１スイッチ素子Ｑ１をオフ、第２スイッチ素子Ｑ２をオンにし、負荷電流を第４スイッチ素子Ｑ４および第２ダイオードＤ２（または、第２スイッチ素子Ｑ２と第４ダイオードＤ４）からなる経路で還流させる第２モード（図３（Ｂ））と、
（３）第１スイッチ素子Ｑ１をオフ、第２スイッチ素子Ｑ２をオンにした状態で、第３スイッチ素子Ｑ３をオン、第４スイッチ素子Ｑ４をオフにし、外部直流電源５の電力を第２および第３スイッチ素子Ｑ２、Ｑ３を介して負荷６に向けて供給する第３モード（図３（Ｃ））と、
（４）第３スイッチ素子Ｑ３をオン、第４スイッチ素子Ｑ４をオフにした状態で、第１スイッチ素子Ｑ１をオン、第２スイッチ素子Ｑ２をオフにし、負荷電流を第１スイッチ素子Ｑ１および第３ダイオードＤ３（または、第３スイッチ素子Ｑ３と第１ダイオードＤ１）からなる経路で還流させる第４モード（図３（Ｄ））と
に順次切り替えられる。 By switching the conduction state of each switch element Q1 to Q4 under the control of the control unit 4a, the switching unit 2a is sequentially switched to the four states shown in FIG.
That is, the switching unit 2a
(1) With the first switch element Q1 turned on and the second switch element Q2 turned off, the third switch element Q3 is turned off, the fourth switch element Q4 is turned on, and the electric power of the external DC power supply 5 is A first mode (FIG. 3A) for supplying the load 6 through the fourth switch elements Q1 and Q4;
(2) With the third switch element Q3 turned off and the fourth switch element Q4 turned on, the first switch element Q1 is turned off, the second switch element Q2 is turned on, and the load current is changed to the fourth switch element Q4 and the fourth switch element Q4. A second mode (FIG. 3B) for recirculation through a path composed of two diodes D2 (or the second switch element Q2 and the fourth diode D4);
(3) With the first switch element Q1 turned off and the second switch element Q2 turned on, the third switch element Q3 is turned on, the fourth switch element Q4 is turned off, and the power of the external DC power supply 5 is A third mode (FIG. 3C) for supplying the load 6 via the third switch elements Q2 and Q3;
(4) With the third switch element Q3 turned on and the fourth switch element Q4 turned off, the first switch element Q1 is turned on, the second switch element Q2 is turned off, and the load current is changed to the first switch element Q1 and the second switch element Q1. The mode is sequentially switched to the fourth mode (FIG. 3D) in which reflux is performed through a path including the three diodes D3 (or the third switch element Q3 and the first diode D1).

ここで、時間差Δｔを共振周期Ｔｓの１／２としたのは、以下のような理由による。
すなわち、図４に示すように、第２および第３スイッチ素子Ｑ２、Ｑ３がオンして中間電圧Ｖ２と出力電圧Ｖ３の電圧値が−Ｅ［Ｖ］となっている第３モードから、第１スイッチ素子Ｑ１がオン、第２スイッチ素子Ｑ２がオフして中間電圧Ｖ２が０［Ｖ］（第４モード）になると、出力電圧Ｖ３に振幅約２Ｅ［Ｖ］、振動周期Ｔｓの振動Ｘが発生する。
その後、第３スイッチ素子Ｑ３がオフ、第４スイッチ素子Ｑ４がオンして中間電圧Ｖ２がＥ［Ｖ］（第１モード）になると、出力電圧Ｖ３に振動Ｘと同一振幅、同一周期の振動Ｙが発生する。
したがって、第３モードから第４モードに移行するタイミングおよび第４モードから第１モードに移行するタイミングをΔｔだけずらすことで、振動Ｘと振動Ｙがちょうど逆位相となって互いに打ち消し合い、両振動を合成してなる出力電圧Ｖ３の振動を抑制することができる。 Here, the reason why the time difference Δt is set to ½ of the resonance period Ts is as follows.
That is, as shown in FIG. 4, from the third mode in which the second and third switch elements Q2, Q3 are turned on and the voltage values of the intermediate voltage V2 and the output voltage V3 are -E [V], When the switch element Q1 is turned on and the second switch element Q2 is turned off and the intermediate voltage V2 becomes 0 [V] (fourth mode), the output voltage V3 generates an oscillation X having an amplitude of about 2E [V] and an oscillation cycle Ts. To do.
After that, when the third switch element Q3 is turned off and the fourth switch element Q4 is turned on and the intermediate voltage V2 becomes E [V] (first mode), the output voltage V3 has the vibration Y having the same amplitude and the same period as the vibration X. Will occur.
Therefore, by shifting the timing of shifting from the third mode to the fourth mode and the timing of shifting from the fourth mode to the first mode by Δt, the vibration X and the vibration Y are just in opposite phases and cancel each other. The vibration of the output voltage V3 formed by synthesizing can be suppressed.

第１モードから第３モードに移行する際も、同様に、中間電圧Ｖ２が０［Ｖ］となる第２モードを間に設けることで、出力電圧Ｖ３の振動を抑制することができる。   Similarly, when shifting from the first mode to the third mode, the oscillation of the output voltage V3 can be suppressed by providing the second mode in which the intermediate voltage V2 is 0 [V].

なお、時間差Δｔを設けない場合、すなわち第２モードおよび第４モードを設けない場合は、図５（Ｂ）に示すように、出力電圧Ｖ３に最大約４Ｅ［Ｖ］の大きな振動が発生する。
また、時間差Δｔを３Ｔｓ／４とした場合は、振動Ｘと振動Ｙのピーク位置がずれるために、やはり出力電圧Ｖ３に振動が発生する（図５（Ｃ）参照）。これに対して、時間差Δｔを振動周期Ｔｓのちょうど１／２とした場合は、図５（Ａ）に示すように、出力電圧Ｖ３にはほとんど振動は発生しない。 When the time difference Δt is not provided, that is, when the second mode and the fourth mode are not provided, a large oscillation of about 4E [V] at maximum occurs in the output voltage V3 as shown in FIG.
Further, when the time difference Δt is 3Ts / 4, the peak positions of the vibration X and the vibration Y are shifted, and therefore the vibration is generated in the output voltage V3 (see FIG. 5C). On the other hand, when the time difference Δt is exactly ½ of the vibration period Ts, as shown in FIG. 5A, the output voltage V3 hardly oscillates.

以上をまとめると、本実施形態に係る電源装置１ａによれば、同一のアームに含まれるスイッチ素子の導通状態を逆位相となるように切り替えるとともに、一のアームに含まれるスイッチ素子の導通状態および他のアームに含まれるスイッチ素子の導通状態を時間差（＝Ｔｓ／２）をつけて切り替えることにより、比較的簡易な構成で、出力電圧Ｖ３の振動を抑制することができる。   In summary, according to the power supply device 1a according to the present embodiment, the conduction state of the switch element included in the same arm is switched so as to be in reverse phase, and the conduction state of the switch element included in one arm is By switching the conduction state of the switch element included in the other arm with a time difference (= Ts / 2), the oscillation of the output voltage V3 can be suppressed with a relatively simple configuration.

［第２実施形態］
続いて本発明の第２実施形態について説明する。図６に示すように、電源装置１ｂは、２つの外部直流電源（第１直流電源５、および第２直流電源５’）から供給されるＥ［Ｖ］の直流電圧を交流の中間電圧Ｖ２に変換するスイッチング部２ｂと、その出力側に設けられた共振部３と、スイッチング部２ａを制御する制御部４ｂとを備え、スイッチング部２ｂで得た中間電圧Ｖ２による交流電力を、共振部３を通じて負荷６に供給する。 [Second Embodiment]
Next, a second embodiment of the present invention will be described. As shown in FIG. 6, the power supply device 1b converts the DC voltage of E [V] supplied from two external DC power supplies (the first DC power supply 5 and the second DC power supply 5 ′) into an AC intermediate voltage V2. A switching unit 2b for conversion, a resonance unit 3 provided on the output side thereof, and a control unit 4b for controlling the switching unit 2a are provided. Supply to load 6.

スイッチング部２ｂは、第１直流電源５の直流電圧を降圧して出力する第１チョッパ回路と、第２直流電源５’の直流電圧を降圧して出力する第２チョッパ回路とを直列に接続したもので、第１チョッパ回路の出力電圧と第２チョッパ回路の出力電圧の和電圧（以下、中間電圧Ｖ２という）を出力する。例えば、第１および第２チョッパ回路の出力電圧がＥ［Ｖ］の場合、中間電圧Ｖ２は２Ｅ［Ｖ］（高電圧値）となる。また、一方のチョッパ回路の出力電圧がＥ［Ｖ］、他方のチョッパ回路の出力電圧が０［Ｖ］の場合、中間電圧Ｖ２はＥ［Ｖ］（中間値）となる。   In the switching unit 2b, a first chopper circuit that steps down and outputs a DC voltage of the first DC power source 5 and a second chopper circuit that steps down and outputs a DC voltage of the second DC power source 5 'are connected in series. Therefore, the sum of the output voltage of the first chopper circuit and the output voltage of the second chopper circuit (hereinafter referred to as intermediate voltage V2) is output. For example, when the output voltages of the first and second chopper circuits are E [V], the intermediate voltage V2 is 2E [V] (high voltage value). When the output voltage of one chopper circuit is E [V] and the output voltage of the other chopper circuit is 0 [V], the intermediate voltage V2 is E [V] (intermediate value).

第１チョッパ回路は、ＩＧＢＴ等からなる第１スイッチ素子Ｑ１’と第１ダイオードＤ１’とを含んでいる。同様に、第２チョッパ回路は、ＩＧＢＴ等からなる第２スイッチ素子Ｑ２’と第２ダイオードＤ２’とを含んでいる。
同図に示すように、第１直流電源５の−端子、第２直流電源５’の＋端子、第１ダイオードＤ１’のアノードおよび第２ダイオードＤ２’のカソードは、同一ラインに接続されている。
第１直流電源５の＋端子と負荷６とを繋ぐラインには、第１直流電源５から負荷６に向かって電流を流し得るように第１スイッチ素子Ｑ１’が介装され、第２直流電源５’の−端子と負荷６とを繋ぐラインには、負荷６から第２直流電源５’に向かって電流を流し得るように第２スイッチ素子Ｑ２’が介装されている。
また、第１ダイオードＤ１’のカソードは第１スイッチ素子Ｑ１’のエミッタに接続され、第２ダイオードＤ２’のアノードは第２スイッチ素子Ｑ２’のコレクタに接続されている。 The first chopper circuit includes a first switch element Q1 ′ made of an IGBT or the like and a first diode D1 ′. Similarly, the second chopper circuit includes a second switch element Q2 ′ made of an IGBT or the like and a second diode D2 ′.
As shown in the figure, the-terminal of the first DC power supply 5, the + terminal of the second DC power supply 5 ', the anode of the first diode D1' and the cathode of the second diode D2 'are connected to the same line. .
A line connecting the + terminal of the first DC power supply 5 and the load 6 is provided with a first switch element Q1 ′ so that a current can flow from the first DC power supply 5 toward the load 6, and the second DC power supply. A second switch element Q2 ′ is interposed in the line connecting the − terminal of 5 ′ and the load 6 so that a current can flow from the load 6 toward the second DC power supply 5 ′.
The cathode of the first diode D1 ′ is connected to the emitter of the first switch element Q1 ′, and the anode of the second diode D2 ′ is connected to the collector of the second switch element Q2 ′.

第１および第２スイッチ素子Ｑ１’、Ｑ２’のベースは制御部４ｂに接続され、制御部４ｂの制御下でベースの電圧が変化することで、第１および第２スイッチ素子Ｑ１’、Ｑ２’の導通状態が切り替えられる。
すなわち、スイッチング部２ｂは、
（１）第１スイッチ素子Ｑ１’がオンした状態で、第２スイッチ素子Ｑ２’がオンし、第１直流電源５からの直流電圧と第２直流電源５’からの直流電圧との和電圧を負荷６に向けて供給する状態（図７の第１モード）と、
（２）第２スイッチ素子Ｑ２’がオンした状態で、第１スイッチ素子Ｑ１’がオフし、第２直流電源５’からの直流電圧を負荷６に向けて供給する状態（図７の第２モード）と、
（３）第１スイッチ素子Ｑ１’がオフした状態で、第２スイッチ素子Ｑ２’がオフし、負荷６に対する電圧供給を停止する状態（図７の第３モード）と、
（４）第２スイッチ素子Ｑ２’がオフした状態で、第１スイッチ素子Ｑ１’がオンし、第１直流電源５からの直流電圧を負荷６に向けて供給する状態（図７の第４モード）と
に順次切り替えられる。 The bases of the first and second switch elements Q1 ′, Q2 ′ are connected to the control unit 4b, and the base voltage changes under the control of the control unit 4b, so that the first and second switch elements Q1 ′, Q2 ′ The conduction state of is switched.
That is, the switching unit 2b
(1) With the first switch element Q1 ′ turned on, the second switch element Q2 ′ is turned on, and the sum voltage of the DC voltage from the first DC power supply 5 and the DC voltage from the second DC power supply 5 ′ is A state of supplying to the load 6 (first mode in FIG. 7),
(2) In a state where the second switch element Q2 ′ is turned on, the first switch element Q1 ′ is turned off and a DC voltage from the second DC power supply 5 ′ is supplied to the load 6 (second state in FIG. 7). Mode)
(3) In a state where the first switch element Q1 ′ is turned off, the second switch element Q2 ′ is turned off, and the voltage supply to the load 6 is stopped (third mode in FIG. 7);
(4) State in which the first switch element Q1 ′ is turned on and the DC voltage from the first DC power supply 5 is supplied to the load 6 in the state where the second switch element Q2 ′ is turned off (fourth mode in FIG. 7). ) And sequentially.

上記のように、第１および第２スイッチ素子Ｑ１’、Ｑ２’の導通状態が切り替えられると、中間電圧Ｖ２が変化する。
すなわち、第１および第２スイッチＱ１’、Ｑ２’をオン状態とした場合（第１モード）、中間電圧Ｖ２は２Ｅ［Ｖ］（高電圧値）となる。両スイッチ素子Ｑ１’、Ｑ２’をオフ状態とした場合（第３モード）、中間電圧Ｖ２は０［Ｖ］（低電圧値）となる。また、いずれか一方のスイッチ素子のみをオン状態とした場合（第２モード、第４モード）、中間電圧Ｖ２はＥ［Ｖ］（中間値）となる。 As described above, when the conduction state of the first and second switch elements Q1 ′ and Q2 ′ is switched, the intermediate voltage V2 changes.
That is, when the first and second switches Q1 ′ and Q2 ′ are turned on (first mode), the intermediate voltage V2 is 2E [V] (high voltage value). When both switch elements Q1 ′ and Q2 ′ are turned off (third mode), the intermediate voltage V2 is 0 [V] (low voltage value). When only one of the switch elements is turned on (second mode, fourth mode), the intermediate voltage V2 is E [V] (intermediate value).

共振部３は、第１チョッパ回路と負荷６とを繋ぐラインに介装された直列リアクトルＬ１と、第２チョッパ回路と負荷６とを繋ぐラインに介装された直列リアクトルＬ２と、負荷６と並列となるように両ライン間に接続された線間コンデンサＣとからなる。また、制御部４ｂは、電流センサ７で検出された負荷６の通流電流を参照しつつ、各スイッチ素子Ｑ１’、Ｑ２’の導通状態を切り替える。   The resonating unit 3 includes a series reactor L1 interposed in a line connecting the first chopper circuit and the load 6, a series reactor L2 interposed in a line connecting the second chopper circuit and the load 6, and the load 6. It consists of a line capacitor C connected between both lines so as to be in parallel. The control unit 4b switches the conduction state of the switch elements Q1 'and Q2' while referring to the current flowing through the load 6 detected by the current sensor 7.

図７は、各スイッチ素子Ｑ１’、Ｑ２’の導通状態と、中間電圧Ｖ２および負荷６に供給される出力電圧Ｖ３との関係を示した図である。同図に示すように、第１スイッチ素子Ｑ１’の導通状態と第２スイッチ素子Ｑ２’の導通状態は、Δｔだけ時間差をつけて切り替えられる。時間差Δｔは、共振部３の共振周期Ｔｓの１／２である。   FIG. 7 is a diagram showing the relationship between the conduction states of the switch elements Q1 'and Q2' and the intermediate voltage V2 and the output voltage V3 supplied to the load 6. As shown in the figure, the conduction state of the first switch element Q1 'and the conduction state of the second switch element Q2' are switched with a time difference of Δt. The time difference Δt is ½ of the resonance period Ts of the resonance unit 3.

時間差Δｔを共振周期Ｔｓの１／２とする理由を、第３モードから第１モードへの移行に注目して説明すると、以下のようになる。
すなわち、中間電圧Ｖ２が０［Ｖ］（低電圧値）である第３モードと中間電圧Ｖ２が２Ｅ［Ｖ］（高電圧値）の第１モードの間に、中間電圧Ｖ２がＥ［Ｖ］（中間値）の第４モードを設け、さらに第４モードの幅を共振周期Ｔｓの１／２とすることにより、第１実施形態の場合と同様、第３モードから第４モードに移行する際に発生する出力電圧Ｖ３の振動と、第４モードから第１モードに移行する際に発生する出力電圧Ｖ３の振動がちょうど逆位相となって互いに打ち消し合い、出力電圧Ｖ３の振動を抑制することができる。 The reason why the time difference Δt is set to ½ of the resonance period Ts will be described below by focusing on the transition from the third mode to the first mode.
That is, the intermediate voltage V2 is E [V] between the third mode in which the intermediate voltage V2 is 0 [V] (low voltage value) and the first mode in which the intermediate voltage V2 is 2E [V] (high voltage value). When the mode is shifted from the third mode to the fourth mode, as in the case of the first embodiment, by providing the (intermediate value) fourth mode and setting the width of the fourth mode to ½ of the resonance period Ts. The vibration of the output voltage V3 generated at the time and the vibration of the output voltage V3 generated when shifting from the fourth mode to the first mode cancel each other out, thereby suppressing the vibration of the output voltage V3. it can.

結局、本実施形態に係る電源装置１ｂによれば、第１チョッパ回路に含まれるスイッチ素子の導通状態および第２チョッパ回路に含まれるスイッチ素子の導通状態を時間差（＝Ｔｓ／２）をつけて切り替えることにより、比較的簡易な構成で、出力電圧Ｖ３の振動を抑制することができる。   After all, according to the power supply device 1b according to the present embodiment, the conduction state of the switch element included in the first chopper circuit and the conduction state of the switch element included in the second chopper circuit are set with a time difference (= Ts / 2). By switching, the oscillation of the output voltage V3 can be suppressed with a relatively simple configuration.

以上、本発明に係る電源装置の好ましい実施形態について説明したが、本発明はこれらの構成に限定されるものではない。   As mentioned above, although preferred embodiment of the power supply device which concerns on this invention was described, this invention is not limited to these structures.

１ａ、１ｂ 電源装置
２ａ、２ｂ スイッチング部
３ 共振部
４ａ、４ｂ 制御部
５、５’ 直流電源
６ 負荷
Ｃ 線間コンデンサ
Ｌ１、Ｌ２ 直列リアクトル
Ｑ１〜Ｑ４、Ｑ１’、Ｑ２’ スイッチ素子
Ｄ１〜Ｄ４、Ｄ１’、Ｄ２’ ダイオード DESCRIPTION OF SYMBOLS 1a, 1b Power supply device 2a, 2b Switching part 3 Resonance part 4a, 4b Control part 5, 5 'DC power supply 6 Load C Line capacitor L1, L2 Series reactor Q1-Q4, Q1', Q2 'Switch element D1-D4, D1 ', D2' diode

Claims (2)

第１〜第４スイッチ素子からなる４つのスイッチ素子を単相フルブリッジ接続し、一方のアームを前記第１および前記第２スイッチ素子から構成し、他方のアームを前記第３および前記第４スイッチ素子から構成するとともに、前記第１〜第４スイッチ素子の各々に第１〜第４ダイオードを逆並列接続し、前記４つのスイッチ素子を用いて入力直流電力をスイッチングするスイッチング部と、
前記スイッチング部の出力側に接続され、直列リアクトルおよび線間コンデンサからなる共振部と、
前記４つのスイッチ素子の導通状態を各々、切り替える制御部と
を備え、前記スイッチング部で得た交流電力を、前記共振部を通じて負荷に供給する電源装置であって、
前記制御部の制御下で前記第１および第２スイッチ素子の導通状態の切り替えタイミングに対して、前記第３および第４スイッチ素子の導通状態の切り替えタイミングを、前記直列リアクトルおよび前記線間コンデンサの共振周期の１／２だけずらすことにより、
前記第１スイッチ素子をオン、前記第２スイッチ素子をオフにした状態で、前記第３スイッチ素子をオフ、前記第４スイッチ素子をオンにし、前記入力直流電力を前記第１および第４スイッチ素子を介して前記負荷に向けて供給する第１モードと、
前記第３スイッチ素子をオフ、前記第４スイッチ素子をオンにした状態で、前記第１スイッチ素子をオフ、前記第２スイッチ素子をオンにし、負荷電流を前記第４スイッチ素子および前記第２ダイオードからなる経路で還流させる第２モードと、
前記第１スイッチ素子をオフ、前記第２スイッチ素子をオンにした状態で、前記第３スイッチ素子をオン、前記第４スイッチ素子をオフにし、前記入力直流電力を前記第２および第３スイッチ素子を介して前記負荷に向けて供給する第３モードと、
前記第３スイッチ素子をオン、前記第４スイッチ素子をオフにした状態で、前記第１スイッチ素子をオン、前記第２スイッチ素子をオフにし、負荷電流を前記第１スイッチ素子および前記第４ダイオードからなる経路で還流させる第４モードと
に順次切り替わることを特徴とする電源装置。 Four switch elements comprising the first to fourth switch elements are connected in a single-phase full bridge, one arm is constituted by the first and second switch elements, and the other arm is constituted by the third and fourth switches. And a switching unit configured to reversely connect first to fourth diodes to each of the first to fourth switch elements, and to switch input DC power using the four switch elements,
Connected to the output side of the switching unit, and a resonance unit comprising a series reactor and a line-to-line capacitor;
A control unit that switches each of the conduction states of the four switch elements, and a power supply device that supplies AC power obtained by the switching unit to a load through the resonance unit,
With respect to the switching timing of the conduction state of the first and second switch elements under the control of the control unit, the switching timing of the conduction state of the third and fourth switch elements is set to the value of the series reactor and the line capacitor. By shifting by half the resonance period,
With the first switch element turned on and the second switch element turned off, the third switch element is turned off, the fourth switch element is turned on, and the input DC power is changed to the first and fourth switch elements. A first mode for supplying to the load via
With the third switch element turned off and the fourth switch element turned on, the first switch element is turned off, the second switch element is turned on, and the load current is changed to the fourth switch element and the second diode. A second mode for refluxing through a path consisting of:
With the first switch element turned off and the second switch element turned on, the third switch element is turned on, the fourth switch element is turned off, and the input DC power is supplied to the second and third switch elements. A third mode for supplying to the load via
With the third switch element turned on and the fourth switch element turned off, the first switch element is turned on, the second switch element is turned off, and the load current is supplied to the first switch element and the fourth diode. The power supply device is characterized in that it is sequentially switched to a fourth mode for recirculation through a path consisting of: 第１直流電源と第１スイッチ素子とを含む第１チョッパ回路と、第２直流電源と第２スイッチ素子とを含む第２チョッパ回路とを直列接続してなり、各チョッパ回路の出力電圧の和電圧を負荷に対して出力するスイッチング部と、
前記スイッチング部の出力側に接続され、直列リアクトルおよび線間コンデンサからなる共振部と、
前記第１および第２スイッチ素子の導通状態を切り替える制御部と
を備え、前記和電圧による電力を、前記共振部を通じて前記負荷に供給する電源装置であって、
前記制御部の制御下で前記第１スイッチ素子の導通状態の切り替えタイミングに対して、前記第２スイッチ素子の導通状態の切り替えタイミングを、前記直列リアクトルおよび前記線間コンデンサの共振周期の１／２だけずらすことにより、
前記第１スイッチ素子をオンにした状態で、前記第２スイッチ素子をオンにし、前記第１直流電源からの直流電圧と前記第２直流電源からの直流電圧との和電圧を前記負荷に向けて供給する第１モードと、
前記第２スイッチ素子をオンにした状態で、前記第１スイッチ素子をオフにし、前記第２直流電源からの直流電圧を前記負荷に向けて供給する第２モードと、
前記第１スイッチ素子をオフにした状態で、前記第２スイッチ素子をオフにし、前記負荷に対する電圧供給を停止する第３モードと、
前記第２スイッチ素子をオフにした状態で、前記第１スイッチ素子をオンにし、前記第１直流電源からの直流電圧を前記負荷に向けて供給する第４モードと
に順次切り替わることを特徴とする電源装置。 A first chopper circuit including a first DC power supply and a first switch element and a second chopper circuit including a second DC power supply and a second switch element are connected in series, and the sum of output voltages of the respective chopper circuits. A switching unit that outputs a voltage to a load;
Connected to the output side of the switching unit, and a resonance unit comprising a series reactor and a line-to-line capacitor;
A control unit that switches a conduction state of the first and second switch elements, and a power supply device that supplies power by the sum voltage to the load through the resonance unit,
Under the control of the control unit, the switching timing of the conductive state of the second switch element is set to 1/2 the resonance period of the series reactor and the line capacitor with respect to the switching timing of the conductive state of the first switch element. By just shifting
With the first switch element turned on, the second switch element is turned on, and the sum voltage of the DC voltage from the first DC power supply and the DC voltage from the second DC power supply is directed to the load. A first mode of supply;
A second mode in which the first switch element is turned off and a DC voltage from the second DC power source is supplied to the load in a state where the second switch element is turned on;
A third mode in which the second switch element is turned off in a state where the first switch element is turned off, and the voltage supply to the load is stopped;
With the second switch element turned off, the first switch element is turned on, and the mode is sequentially switched to the fourth mode in which the DC voltage from the first DC power source is supplied to the load. Power supply.
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