JP2005341722A - Ac/dc converter - Google Patents

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JP2005341722A
JP2005341722A JP2004157647A JP2004157647A JP2005341722A JP 2005341722 A JP2005341722 A JP 2005341722A JP 2004157647 A JP2004157647 A JP 2004157647A JP 2004157647 A JP2004157647 A JP 2004157647A JP 2005341722 A JP2005341722 A JP 2005341722A
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switch
switches
phase
circuit
inrush current
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Junpei Hayakawa
純平 早川
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Shindengen Electric Manufacturing Co Ltd
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Shindengen Electric Manufacturing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an AC/DC converter equipped with a rush current preventive circuit to prevent rush current, which allows reduction in size and cost. <P>SOLUTION: In the AC/DC converter, diodes 4a, 4b and switches 5a, 5b are connected on a bridge via a reactor 3 at one end of a single phase AC power supply 1 to convert AC to DC, voltage is stepped up, a smoothing capacitor 7 is connected to the output of the bridge to smooth voltage and to supply DC power to a load 8, and the rush current preventive circuit 6a is connected in parallel to a switch either 5a or 5b. The switches 5a, 5b are left in a turned off state, till the smoothing capacitor 7 is charged to some extent and the voltage is increased by an input voltage detection circuit after turning on the single phase power supply 1, allowing current to flow into the rush current preventive circuit 6a to restrain the rush current with a resistor 6b. When the voltage of the capacitor is increased above a certain value, the switches 5a, 5b are switched to a normal operation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、交流直流変換装置の電源投入時、平滑コンデンサに流れる突入電流を防止する回路に関する。   The present invention relates to a circuit for preventing an inrush current flowing in a smoothing capacitor when an AC / DC converter is powered on.

図１７は従来の交流直流変換装置の例を示すもので、単相交流電源１に突入電流防止回路２ａとリアクトル３を直列に接続し、ダイオード４ａ, ４ｂとスイッチ５ａ, ５ｂをブリッジ状に接続し、その出力に平滑コンデンサ７を接続している。さらにその出力に負荷８を接続している（例えば、特許文献１参照）。
特開平７−３２２４８５号公報 FIG. 17 shows an example of a conventional AC / DC converter, in which an inrush current prevention circuit 2a and a reactor 3 are connected in series to a single-phase AC power source 1, and diodes 4a and 4b and switches 5a and 5b are connected in a bridge shape. A smoothing capacitor 7 is connected to the output. Furthermore, the load 8 is connected to the output (for example, refer patent document 1).
JP-A-7-322485

この交流直流変換装置について通常時の動作を図を用いて説明する。
図７は単相交流電源１が正の半周期（図１７においてＶｉｎの矢印方向を正とする）でスイッチ５ａがオンのときにおける電流経路、図８は単相交流電源１が正の半周期でスイッチ５ａがオフのときにおける電流経路を示す。図９、図１０は単相交流電源１が負の半周期でスイッチ５ｂがそれぞれオン、オフのときにおける電流経路を示す。図２０は入力電圧・電流の波形と各スイッチの動作状態を示す。 The normal operation of the AC / DC converter will be described with reference to the drawings.
FIG. 7 shows a current path when the single-phase AC power supply 1 is in a positive half cycle (the direction of the arrow Vin is positive in FIG. 17) and the switch 5a is on. FIG. 8 shows a single-cycle AC power supply 1 in a positive half cycle. The current path when the switch 5a is OFF is shown. 9 and 10 show current paths when the single-phase AC power supply 1 is in a negative half cycle and the switch 5b is on and off, respectively. FIG. 20 shows input voltage / current waveforms and the operating state of each switch.

図７に示すように、正の半周期では、スイッチ５ａがオンのとき、単相交流電源１-リアクトル３-スイッチ５ａ-スイッチ５ｂ-単相交流電源１で流れ、リアクトル３にエネルギーを貯める。スイッチ５ａがオフのとき、電流は単相交流電源１-リアクトル３-ダイオード４ａ-平滑コンデンサ７・負荷８-スイッチ５ｂ-単相交流電源１で流れ、リアクトル３で貯めたエネルギーを負荷８に伝えている。このようにスイッチ５ａがオン／オフのスイッチング、スイッチ５ｂがオン固定の状態で動作することで、単相交流電圧を直流に変換しながら出力電圧を制御している。負の半周期は逆にスイッチ５ｂがオン／オフのスイッチング、スイッチ５ａがオン固定の状態で動作する。   As shown in FIG. 7, in the positive half cycle, when the switch 5 a is on, the current flows through the single-phase AC power source 1 -reactor 3 -switch 5 a -switch 5 b -single-phase AC power source 1 and stores energy in the reactor 3. When the switch 5a is off, the current flows through the single-phase AC power source 1-reactor 3-diode 4a-smoothing capacitor 7 / load 8-switch 5b-single-phase AC power source 1, and transfers the energy stored in the reactor 3 to the load 8. ing. As described above, the switch 5a is switched on / off and the switch 5b is operated in a fixed state, so that the output voltage is controlled while converting the single-phase AC voltage into DC. In the negative half cycle, the switch 5b is switched on / off and the switch 5a is fixed on.

次に単相交流電源投入時の動作は以下の通りとなる。
単相交流電源１が投入直後において、平滑コンデンサ７が充電されていないと、スイッチ５ａまたは５ｂがオンした直後、回路に過大な突入電流が流れるが、図１８のようにリレースイッチ２ｃをオフして、抵抗２ｂを介すことによって、この電流を緩和させている。コンデンサ電圧がある値以上に上昇すると、入力電圧検出回路によってリレースイッチ２ｃをオンするように制御信号を与え、図１９のように突入電流防止回路２ｂをショート状態にして、通常動作を開始する。 Next, the operation when the single-phase AC power is turned on is as follows.
If the smoothing capacitor 7 is not charged immediately after the single-phase AC power supply 1 is turned on, an excessive inrush current flows in the circuit immediately after the switch 5a or 5b is turned on. However, the relay switch 2c is turned off as shown in FIG. The current is relaxed through the resistor 2b. When the capacitor voltage rises above a certain value, a control signal is given by the input voltage detection circuit to turn on the relay switch 2c, the inrush current prevention circuit 2b is short-circuited as shown in FIG. 19, and normal operation is started.

図１７の上記リレースイッチ２ｃは、他の部品と比べ大型で、使用可能な動作温度範囲が低く、装置の小型化の弊害になる。また、このリレースイッチ２ｃは高価で電源装置の低コスト設計の弊害になっている。   The relay switch 2c shown in FIG. 17 is larger than other components, has a low usable operating temperature range, and is an adverse effect of downsizing the device. Further, the relay switch 2c is expensive and has a negative effect on the low-cost design of the power supply device.

本発明は、上記問題に鑑みてなされたものであり、装置の小型化並びにに低コスト化が可能な突入電流を防止する突入電流防止回路を備えた交流直流変換装置を提供する。   The present invention has been made in view of the above problems, and provides an AC / DC converter including an inrush current prevention circuit that prevents an inrush current that can be reduced in size and cost.

本発明に係る交流直流変換装置は、単相又は多相の交流電源の少なくとも一方の端子にリアクトルを介して、複数個の整流素子でブリッジ接続されたブリッジ回路を接続し、このブリッジ回路の直流出力と並列に平滑コンデンサを接続して、負荷に直流電力を供給する交流直流変換装置において、前記ブリッジ回路の整流素子のうち少なくともプラス側又はマイナス側の全てをスイッチ素子で構成し、これらスイッチ素子の少なくとも一つのスイッチ素子と並列に抵抗とダイオードとを直列に接続してなる突入電流防止回路を備えてあることを特徴とする。   The AC / DC converter according to the present invention connects a bridge circuit that is bridge-connected by a plurality of rectifier elements to at least one terminal of a single-phase or multi-phase AC power supply via a reactor, and the DC of the bridge circuit In an AC / DC converter that connects a smoothing capacitor in parallel with an output and supplies DC power to a load, at least a plus side or a minus side of the rectifier elements of the bridge circuit is configured by switch elements, and these switch elements And an inrush current prevention circuit comprising a resistor and a diode connected in series in parallel with at least one of the switching elements.

また、本発明に係る交流直流変換装置は、前記スイッチ素子を双方向スイッチで構成してあることを特徴とする。   The AC / DC converter according to the present invention is characterized in that the switch element is constituted by a bidirectional switch.

本発明によれば、入力に接続した突入電流防止回路とそれを切り替えるリレースイッチについて、出力電圧を制御する双方向スイッチと並列に突入電流防止回路を接続して、この双方向スイッチで突入電流防止回路を切り替ることで、リレースイッチを省くことが可能となる。他の部品より大型で、温度範囲の低いリレースイッチが省けるので、回路全体を小型化並びに低コスト化することが可能となり、使用温度範囲が低くならなくなる。   According to the present invention, an inrush current prevention circuit connected to the input and a relay switch for switching the inrush current prevention circuit are connected in parallel with the bidirectional switch for controlling the output voltage, and the inrush current prevention is performed by the bidirectional switch. By switching the circuit, the relay switch can be omitted. Since a relay switch that is larger than other components and has a low temperature range can be omitted, the entire circuit can be reduced in size and cost, and the operating temperature range is not lowered.

発明を実施するための最良の形態を図１の回路と図１４の動作波形に基づいて説明する。単相交流電源１の一端にリアクトル３を介して、ダイオード４ａ, ４ｂと、スイッチ５ａ, ５ｂとをブリッジ上に接続して交流を直流に変換、電圧の昇圧を行い、そのブリッジの出力に平滑コンデンサ７を接続して電圧を平滑して、負荷８に直流電力を供給する。なお、本発明に係る交流直流変換装置では、単相交流電源１の一端にのみならず、他端にもリアクトル３を接続してもよい。また、他端にのみリアクトル３を接続してもよい。   The best mode for carrying out the invention will be described based on the circuit of FIG. 1 and the operation waveforms of FIG. A diode 4a, 4b and switches 5a, 5b are connected to a bridge through a reactor 3 at one end of a single-phase AC power source 1 to convert AC to DC, boost the voltage, and smooth the output of the bridge A capacitor 7 is connected to smooth the voltage, and DC power is supplied to the load 8. In the AC / DC converter according to the present invention, the reactor 3 may be connected not only to one end of the single-phase AC power supply 1 but also to the other end. Further, the reactor 3 may be connected only to the other end.

本発明に係る交流直流変換装置は、スイッチと並列に突入電流防止回路を接続することを特徴としており、本実施形態では、突入電流防止回路６ａを、スイッチ５ａ並列に接続してある。この突入電流防止回路６ａは、抵抗６ｂとダイオード６ｃとで構成し、スイッチ５ａのマイナス側にダイオード６ｃのアノードを接続し、このダイオード６ｃのカソードを抵抗６ｂに接続し、抵抗６ｂをスイッチ５ａのプラス側に接続してある。なお、突入電流防止回路をスイッチ５ｂと並列に接続して設けてもよい。また、突入電流防止回路を２つのスイッチ５ａ，５ｂとそれぞれ並列に接続して設けてもよい。   The AC / DC converter according to the present invention is characterized in that an inrush current prevention circuit is connected in parallel with the switch. In this embodiment, the inrush current prevention circuit 6a is connected in parallel with the switch 5a. The inrush current prevention circuit 6a is composed of a resistor 6b and a diode 6c, the anode of the diode 6c is connected to the negative side of the switch 5a, the cathode of the diode 6c is connected to the resistor 6b, and the resistor 6b is connected to the switch 5a. Connected to the positive side. An inrush current prevention circuit may be provided in parallel with the switch 5b. Further, an inrush current preventing circuit may be provided in parallel with the two switches 5a and 5b.

続いて、動作について説明する。
通常時の動作は、単相交流電源が正の半周期では、図７及び図８に示すように、スイッチ５ａをオン／オフのスイッチング状態にし、スイッチ５ｂをオン状態で固定する。負の半周期では、図９及び図１０に示すように、スイッチ５ｂをオン／オフのスイッチング状態にし、スイッチ５ａをオン状態で固定することで、交流を直流に変換して出力電圧を制御している（図１４の通常動作）。 Subsequently, the operation will be described.
In the normal operation, when the single-phase AC power supply is in a positive half cycle, as shown in FIGS. 7 and 8, the switch 5a is turned on / off and the switch 5b is fixed in the on state. In the negative half cycle, as shown in FIGS. 9 and 10, the switch 5b is turned on / off and the switch 5a is fixed in the on state, thereby converting the alternating current into the direct current and controlling the output voltage. (Normal operation in FIG. 14).

単相交流電源を投入した直後の動作は、例として、図１のように突入電流防止回路６ａをスイッチ５ａに並列に接続した場合、単相交流電源１を投入後、平滑コンデンサ７がある程度充電され、入力電圧検出回路によってある程度電圧が上昇するまで、スイッチ５ａ, ５ｂをオフの状態にしておく。図１の場合では単相交流電源１が負の半周期となれば、電流経路は図１１に示すように、単相交流電源１-ダイオード４ｂ-平滑コンデンサ７・負荷８-突入電流防止回路６ａのダイオード６ｃ-抵抗６ｂ-リアクトル３-単相交流電源１の順に流れ、突入電流は抵抗６ｂで抑制される。コンデンサの電圧が設定値以上になると、スイッチ５ａ, ５ｂは、図１２，１３に示すように通常動作に切り替わる。   As an example, the operation immediately after the single-phase AC power supply is turned on, when the inrush current prevention circuit 6a is connected in parallel to the switch 5a as shown in FIG. 1, the smoothing capacitor 7 is charged to some extent after the single-phase AC power supply 1 is turned on. Then, the switches 5a and 5b are turned off until the voltage rises to some extent by the input voltage detection circuit. In the case of FIG. 1, if the single-phase AC power source 1 has a negative half cycle, the current path is as shown in FIG. The diode 6c, the resistor 6b, the reactor 3, and the single-phase AC power source 1 flow in this order, and the inrush current is suppressed by the resistor 6b. When the voltage of the capacitor becomes equal to or higher than the set value, the switches 5a and 5b are switched to normal operation as shown in FIGS.

図２に実施例１を示す。この実施例１では、スイッチ１０ａ，１０ｂについて、オンしたとき電流が一方向のみ流れないスイッチ２個をそれぞれ逆方向に接続することで、両方向から電流を流すことが可能な双方向性のあるスイッチに置き換えている。なお、その他の回路構成並びに動作については図１図示の最良の実施形態とほぼ同様であるため、省略する。   Example 1 is shown in FIG. In the first embodiment, the switches 10a and 10b are bidirectional switches that allow current to flow from both directions by connecting two switches that do not allow current to flow in only one direction when they are turned on in opposite directions. Has been replaced. Other circuit configurations and operations are substantially the same as those of the best embodiment shown in FIG.

本発明の実施例２を図３の回路と図１５の動作波形に基づいて説明する。単相交流電源１の一端にリアクトル３を介して、スイッチ１２ａ, １２ｂ, １２ｃ, １２ｄをブリッジ上に接続して交流を直流に変換、電圧を昇圧する。そのブリッジの出力に平滑コンデンサ７を接続して電圧を平滑して、負荷８に直流電力を供給する。   A second embodiment of the present invention will be described based on the circuit of FIG. 3 and the operation waveform of FIG. Switches 12a, 12b, 12c, and 12d are connected to a bridge at one end of the single-phase AC power source 1 via a reactor 3 to convert AC to DC and boost the voltage. A smoothing capacitor 7 is connected to the output of the bridge to smooth the voltage, and DC power is supplied to the load 8.

実施例２では、突入電流防止回路６ａを、４個のスイッチ５ａ, ５ｂ, ５ｃ, ５ｄのうち、スイッチ５ａにのみ設けてある。この突入電流防止回路６ａは、前記実施例と同様、抵抗６ｂとダイオード６ｃとで構成し、スイッチ５ａのマイナス側にダイオード６ｃのアノードを接続し、このダイオード６ｃのカソードを抵抗６ｂに接続し、抵抗６ｂをスイッチ５ａのプラス側に接続してある。なお、本実施例においても、突入電流防止回路を他のスイッチ５ｂ，５ｃ，５ｄのいずれかにも設けることができる。また、突入電流防止回路をスイッチ５ａ，５ｂ，５ｃ，５ｄのうちいずれか複数箇所に設けることも可能である。   In the second embodiment, the inrush current prevention circuit 6a is provided only in the switch 5a among the four switches 5a, 5b, 5c, and 5d. This inrush current prevention circuit 6a is composed of a resistor 6b and a diode 6c as in the above embodiment, the anode of the diode 6c is connected to the negative side of the switch 5a, and the cathode of the diode 6c is connected to the resistor 6b. A resistor 6b is connected to the plus side of the switch 5a. Also in this embodiment, an inrush current prevention circuit can be provided in any of the other switches 5b, 5c, 5d. It is also possible to provide an inrush current prevention circuit at any one of the switches 5a, 5b, 5c, 5d.

続いて、動作について説明する。
スイッチ５ａ，５ｂ，５ｃ，５ｄを４個使用した場合の通常時の動作は、単相交流電源１が正の半周期ではスイッチ５ａ、５ｃをオン／オフのスイッチング状態にし、スイッチ５ｂ、５ｄをオン状態で固定して、負の半周期ではスイッチ５ｂ、５ｄをオン／オフのスイッチング状態にし、スイッチ５ａ、５ｃをオン状態で固定することで、交流を直流に変換して出力電圧を制御している（図１５の通常動作）。 Subsequently, the operation will be described.
When four switches 5a, 5b, 5c, and 5d are used, the normal operation is to switch on / off the switches 5a and 5c when the single-phase AC power supply 1 is in a positive half cycle, and switch 5b and 5d. Fixed in the on state, switches 5b and 5d are switched on / off in the negative half cycle, and switches 5a and 5c are fixed in the on state, thereby converting AC to DC and controlling the output voltage. (Normal operation in FIG. 15).

単相交流電源１を投入した直後の動作は、例として図３のように、突入電流防止回路６ａをスイッチ５ａに並列に接続した場合、単相交流電源１を投入後、平滑コンデンサ７がある程度充電され、入力電圧検出回路によってある程度電圧が上昇するまで、スイッチ５ａ,５ｂはオフの状態に、スイッチ５ｄはオンの状態にしておく。単相交流電源１が負の半周期において、電流経路は単相交流電源１-スイッチ５ｄ-平滑コンデンサ７・負荷８-突入電流防止回路６ａのダイオード６ｃ-抵抗６ｂ-リアクトル３-単相交流電源１の順に流れ、突入電流は抵抗６ｂで抑制される。コンデンサ７の電圧が設定値以上になると、スイッチ５ａ,５ｂ, ５ｃ,５ｄは通常動作に切り替わる。   The operation immediately after the single-phase AC power supply 1 is turned on is, for example, as shown in FIG. 3, when the inrush current prevention circuit 6a is connected in parallel to the switch 5a, the smoothing capacitor 7 is somewhat fixed after the single-phase AC power supply 1 is turned on. The switches 5a and 5b are kept off and the switch 5d is kept on until the battery is charged and the voltage rises to some extent by the input voltage detection circuit. In the negative half cycle of the single-phase AC power source 1, the current path is a single-phase AC power source 1-switch 5d-smoothing capacitor 7, load 8-inrush current prevention circuit 6a diode 6c-resistance 6b-reactor 3-single-phase AC power source The current flows in the order of 1, and the inrush current is suppressed by the resistor 6b. When the voltage of the capacitor 7 exceeds the set value, the switches 5a, 5b, 5c, 5d are switched to normal operation.

本実施例においては、ブリッジを構成する整流素子をスイッチ５ａ，５ｂ，５ｃ，５ｄで構成してあるが、プラス側の整流素子をスイッチで構成し、マイナス側の整流素子をダイオードで構成することも可能である。   In this embodiment, the rectifying elements constituting the bridge are constituted by the switches 5a, 5b, 5c, and 5d. However, the plus side rectifying element is constituted by a switch, and the minus side rectifying element is constituted by a diode. Is also possible.

図４に実施例３を示す。この実施例３では、スイッチ１０ａ，１０ｂ，１０ｃ，１０ｄについて、オンしたとき電流が一方向のみ流れないスイッチ２個をそれぞれ逆方向に接続することで、両方向から電流を流すことが可能な双方向性のあるスイッチに置き換えている。なお、その他の回路構成並びに動作については実施例３とほぼ同様であるため、省略する。   Example 3 is shown in FIG. In the third embodiment, the switches 10a, 10b, 10c, and 10d are bidirectional in which current can be supplied from both directions by connecting two switches that do not allow current to flow in only one direction when they are turned on. It has been replaced with a switch. Other circuit configurations and operations are substantially the same as those in the third embodiment, and are omitted.

本実施例においては、ブリッジを構成する整流素子を双方向性のあるスイッチ１０ａ，１０ｂ，１０ｃ，１０ｄで構成してあるが、プラス側の整流素子を双方向性のあるスイッチで構成し、マイナス側の整流素子をダイオードで構成することも可能である。   In this embodiment, the rectifying element constituting the bridge is configured by bidirectional switches 10a, 10b, 10c, and 10d. However, the plus side rectifying element is configured by a bidirectional switch and minus It is also possible to configure the rectifying element on the side with a diode.

本発明の実施例４を図５の回路と図１６の動作波形に基づいて説明する。三相交流電源１３ａ, １３ｂ, １３ｃの一端にリアクトル１４ａ, １４ｂ, １４ｃを介して、ダイオード１５ａ, １５ｂ, １５ｃと、スイッチ１６ａ, １６ｂ, １６ｃとをブリッジ上に接続して交流を直流に変換、電圧を昇圧する。そのブリッジの出力に平滑コンデンサ７を接続して電圧を平滑して、負荷８に直流電力を供給する。   A fourth embodiment of the present invention will be described based on the circuit of FIG. 5 and the operation waveform of FIG. The diodes 15a, 15b, 15c and the switches 16a, 16b, 16c are connected to one end of the three-phase AC power supplies 13a, 13b, 13c via the reactors 14a, 14b, 14c on the bridge to convert AC to DC. Boost the voltage. A smoothing capacitor 7 is connected to the output of the bridge to smooth the voltage, and DC power is supplied to the load 8.

実施例４では、突入電流防止回路６ａを、スイッチ１６ａと並列に接続してある。この突入電流防止回路６ａは、前記実施例と同様、抵抗６ｂとダイオード６ｃとで構成し、スイッチ１６ａのマイナス側にダイオード６ｃのアノードを接続し、このダイオード６ｃのカソードを抵抗６ｂに接続し、抵抗６ｂをスイッチ１６ａのプラス側に接続してある。なお、本実施例においても、突入電流防止回路を他のスイッチ１６ｂ，１６ｃのいずれかにも設けることができる。また、突入電流防止回路をスイッチ１６ａ，１６ｂ，１６ｃ，１６ｄのうちいずれか複数箇所に設けることも可能である。   In the fourth embodiment, the inrush current prevention circuit 6a is connected in parallel with the switch 16a. This inrush current prevention circuit 6a is composed of a resistor 6b and a diode 6c, as in the previous embodiment, and the anode of the diode 6c is connected to the negative side of the switch 16a, and the cathode of the diode 6c is connected to the resistor 6b. The resistor 6b is connected to the plus side of the switch 16a. Also in this embodiment, an inrush current prevention circuit can be provided in either of the other switches 16b and 16c. It is also possible to provide an inrush current prevention circuit at any one of the switches 16a, 16b, 16c and 16d.

続いて、動作について説明する。
入力を三相交流とした場合の通常動作については、各相において正の半周期となった相のスイッチはオン／オフのスイッチングの状態、負の半周期となった相はオン固定の状態にすることで、交流を直流に変換して出力電圧を制御している（図１６の通常動作）。オン／オフのスイッチングの状態が２相で行われる場合、２個のスイッチのオン／オフは同じタイミングとなる。 Subsequently, the operation will be described.
For normal operation when the input is a three-phase alternating current, the phase switch with positive half-cycle in each phase is switched on / off, and the phase with negative half-cycle is fixed on. By doing so, the output voltage is controlled by converting alternating current into direct current (normal operation in FIG. 16). When the on / off switching state is performed in two phases, the two switches are turned on / off at the same timing.

三相交流電源１３ａ，１３ｂ，１３ｃを投入した直後の動作は、例として図５のように、突入電流防止回路６ａをスイッチ１６ａに並列に接続した場合、三相交流電源１３ａ, １３ｂ, １３ｃを投入後、平滑コンデンサ７がある程度充電され、入力電圧検出回路によってある程度電圧が上昇するまで、スイッチ１６ａ, １６ｂ, １６ｃはオフの状態にしておく。三相交流電源１３ａが正である周期において、電流経路は三相交流電源１３ｂ, １３ｃ-リアクトル１４ｂ, １４ｃ-ダイオード１５ｂ, １５ｃ-平滑コンデンサ７・負荷８-突入電流防止回路のダイオード６ｃ-抵抗６ｂ-リアクトル１４ａ-三相交流電源１３ａの順に流れ、突入電流は抵抗６ｂで抑制される。ただしこの場合、三相交流電源１３ｂ, １３ｃが負であると、電流はそれぞれの相には流れない。コンデンサ７の電圧が設定値以上になると、スイッチ１６ａ, １６ｂ, １６ｃは通常動作に切り替わる。   The operation immediately after the three-phase AC power supplies 13a, 13b, and 13c are turned on, for example, when the inrush current prevention circuit 6a is connected in parallel to the switch 16a as shown in FIG. 5, the three-phase AC power supplies 13a, 13b, and 13c are connected. After charging, the switches 16a, 16b and 16c are kept off until the smoothing capacitor 7 is charged to some extent and the voltage is raised to some extent by the input voltage detection circuit. In the period in which the three-phase AC power supply 13a is positive, the current path is three-phase AC power supply 13b, 13c-reactor 14b, 14c-diode 15b, 15c-smoothing capacitor 7, load 8-diode 6c-resistance 6b of inrush current prevention circuit -Reactor 14a-Three-phase AC power supply 13a flows in this order, and the inrush current is suppressed by resistor 6b. However, in this case, if the three-phase AC power supplies 13b and 13c are negative, current does not flow in each phase. When the voltage of the capacitor 7 exceeds the set value, the switches 16a, 16b, and 16c are switched to normal operation.

本実施例においては、ブリッジを構成するマイナス側の整流素子をスイッチ１６ａ，１６ｂ，１６ｃで構成し、プラス側の整流素子をダイオード１５ａ，１５ｂ，１５ｃで構成してあるが、単相の場合と同様に、全ての整流素子をスイッチで構成したり、プラス側の整流素子をスイッチで構成し、マイナス側の整流素子をダイオードで構成することも可能である。   In this embodiment, the minus side rectifying element constituting the bridge is constituted by the switches 16a, 16b, and 16c, and the plus side rectifying element is constituted by the diodes 15a, 15b, and 15c. Similarly, all the rectifying elements can be constituted by switches, the plus side rectifying elements can be constituted by switches, and the minus side rectifying elements can be constituted by diodes.

図４に実施例５を示す。この実施例５では、スイッチ１７ａ，１７ｂ，１７ｃについて、オンしたとき電流が一方向のみ流れないスイッチ２個をそれぞれ逆方向に接続することで、両方向から電流を流すことが可能な双方向性のあるスイッチに置き換えている。なお、その他の回路構成並びに動作については実施例３とほぼ同様であるため、省略する。   Example 5 is shown in FIG. In the fifth embodiment, the switches 17a, 17b, and 17c are bidirectional so that current can flow from both directions by connecting two switches that do not allow current to flow in only one direction when turned on. It is replaced with a switch. Other circuit configurations and operations are substantially the same as those in the third embodiment, and are omitted.

本実施例においては、ブリッジを構成するマイナス側の整流素子を双方向性のあるスイッチ１７ａ，１７ｂ，１７ｃで構成し、プラス側の整流素子をダイオード１５ａ，１５ｂ，１５ｃで構成してあるが、単相の場合と同様に、全ての整流素子を双方向性スイッチで構成したり、プラス側の整流素子を双方向性スイッチで構成し、マイナス側の整流素子をダイオードで構成することも可能である。   In this embodiment, the minus side rectifying element constituting the bridge is constituted by bidirectional switches 17a, 17b and 17c, and the plus side rectifying element is constituted by diodes 15a, 15b and 15c. As with the single-phase case, all rectifier elements can be configured with bidirectional switches, the positive rectifier element can be configured with a bidirectional switch, and the negative rectifier element can be configured with a diode. is there.

上記実施例では、単相２線式と三相３線式について説明したが、これらに限定されず、例えば三相４線式の場合でも本発明を構成することが可能である。   In the above-described embodiments, the single-phase two-wire system and the three-phase three-wire system have been described. However, the present invention is not limited to these.

本発明によれば、入力に接続した突入電流防止回路とそれを切り替えるリレースイッチについて、出力電圧を制御する双方向スイッチと並列に突入電流防止回路を接続して、この双方向スイッチで突入電流防止回路を切り替ることで、リレースイッチを省くことが可能となる。他の部品より大型で、温度範囲の低いリレースイッチが省けるので、回路全体がを小型化並びに低コスト化することが可能となり、使用温度範囲が低くならなくなる。   According to the present invention, an inrush current prevention circuit connected to the input and a relay switch for switching the inrush current prevention circuit are connected in parallel with the bidirectional switch for controlling the output voltage, and the inrush current prevention is performed by the bidirectional switch. By switching the circuit, the relay switch can be omitted. Since a relay switch that is larger than other components and has a low temperature range can be omitted, the entire circuit can be reduced in size and cost, and the operating temperature range is not lowered.

本発明を実施するための最良の形態における回路図を示す。The circuit diagram in the best form for implementing this invention is shown. 本発明に係る実施例１の回路図を示す。The circuit diagram of Example 1 concerning the present invention is shown. 本発明に係る実施例２の回路図を示す。The circuit diagram of Example 2 concerning the present invention is shown. 本発明に係る実施例３の回路図を示す。The circuit diagram of Example 3 concerning the present invention is shown. 本発明に係る実施例４の回路図を示す。The circuit diagram of Example 4 concerning the present invention is shown. 本発明に係る実施例５の回路図を示す。The circuit diagram of Example 5 concerning the present invention is shown. 本発明に使用できる交流直流変換装置の通常時において、単相交流電源が正でスイッチがオンのときにおける電流経路を示す。In the normal state of the AC / DC converter that can be used in the present invention, the current path when the single-phase AC power supply is positive and the switch is on is shown. 本発明に使用できる交流直流変換装置の通常時において、単相交流電源が正でスイッチがオフのときにおける電流経路を示す。In the normal state of the AC / DC converter that can be used in the present invention, the current path when the single-phase AC power supply is positive and the switch is off is shown. 本発明に使用できる交流直流変換装置の通常時において、単相交流電源が負でスイッチがオンのときにおける電流経路を示す。The current path when the single-phase alternating current power supply is negative and the switch is on in the normal state of the AC / DC converter that can be used in the present invention is shown. 本発明に使用できる交流直流変換装置の通常時において、単相交流電源が負でスイッチがオフのときにおける電流経路を示す。In the normal state of the AC / DC converter that can be used in the present invention, the current path when the single-phase AC power supply is negative and the switch is off is shown. 本発明の突入電流防止回路の動作時における電流経路を示す。The current path at the time of operation | movement of the inrush current prevention circuit of this invention is shown. 本発明の突入電流防止回路の通常時（スイッチオフ時）における電流経路を示す。The current path in the normal time (at the time of switch-off) of the inrush current prevention circuit of this invention is shown. 本発明の突入電流防止回路の動作時（スイッチオン時）における電流経路を示す。The current path at the time of operation (at the time of switch-on) of the inrush current prevention circuit of the present invention is shown. 本発明を実施するための最良の形態における動作波形を示す。The operation | movement waveform in the best form for implementing this invention is shown. 本発明に係る実施例２の動作波形を示す。The operation | movement waveform of Example 2 which concerns on this invention is shown. 本発明に係る実施例４の動作波形を示す。The operation waveform of Example 4 concerning the present invention is shown. 従来の交流直流変換装置の実施例を示す。An example of a conventional AC / DC converter is shown. 従来の突入電流防止回路の動作時における電流経路を示す。The current path at the time of operation | movement of the conventional inrush current prevention circuit is shown. 従来の突入電流防止回路の通常時における電流経路を示す。The current path in the normal time of the conventional inrush current prevention circuit is shown. 従来の交流直流変換装置の動作波形を示す。The operation | movement waveform of the conventional AC / DC converter is shown.

符号の説明Explanation of symbols

１ 交流入力電源
２ａ 従来方式の突入電流防止回路
２ｂ 従来方式の突入電流防止回路用の抵抗
２ｃ リレースイッチ
３、１４ａ、１４ｂ、１４ｃ リアクトル
４ａ、４ｂ、１５ａ、１５ｂ、１５ｃ ダイオード
５ａ、５ｂ、５ｃ、５ｄ、１６ａ、１６ｂ、１６ｃ スイッチ
６ａ 本発明における突入電流防止回路
６ｂ 本発明における突入電流防止回路の抵抗
６ｃ 本発明における突入電流防止回路のダイオード
７ 平滑コンデンサ
８ 負荷
９ 制御回路
１０ａ、１０ｂ、１０ｃ、１０ｄ、１７ａ、１７ｂ、１７ｃ 双方向スイッチ
１３ａ、１３ｂ、１３ｃ 三相交流入力電源
1 AC input power supply 2a Conventional inrush current prevention circuit 2b Conventional inrush current prevention circuit 2c Relay switch 3, 14a, 14b, 14c Reactor 4a, 4b, 15a, 15b, 15c Diode 5a, 5b, 5c, 5d, 16a, 16b, 16c Switch 6a Inrush current prevention circuit 6b of the present invention Resistor 6c of the inrush current prevention circuit of the present invention Diode 7 of inrush current prevention circuit of the present invention Smoothing capacitor 8 Load 9 Control circuits 10a, 10b, 10c, 10d, 17a, 17b, 17c Bidirectional switches 13a, 13b, 13c Three-phase AC input power supply

Claims (2)

単相又は多相の交流電源の少なくとも一方の端子にリアクトルを介して、複数個の整流素子でブリッジ接続されたブリッジ回路を接続し、このブリッジ回路の直流出力と並列に平滑コンデンサを接続して、負荷に直流電力を供給する交流直流変換装置において、前記ブリッジ回路の整流素子のうち少なくともプラス側又はマイナス側の全てをスイッチ素子で構成し、これらスイッチ素子の少なくとも一つのスイッチ素子と並列に抵抗とダイオードとを直列に接続してなる突入電流防止回路を備えてあることを特徴とする交流直流変換装置。 Connect a bridge circuit that is bridge-connected with multiple rectifier elements via a reactor to at least one terminal of a single-phase or multi-phase AC power supply, and connect a smoothing capacitor in parallel with the DC output of this bridge circuit. In the AC / DC converter for supplying DC power to the load, at least the positive side or the negative side of the rectifying elements of the bridge circuit are all configured by switch elements, and a resistor is connected in parallel with at least one of the switch elements. An AC / DC converter comprising an inrush current preventing circuit formed by connecting a diode and a diode in series. 前記スイッチ素子を双方向スイッチで構成してあることを特徴とする請求項１記載の交流直流変換装置。

2. The AC / DC converter according to claim 1, wherein the switch element is constituted by a bidirectional switch.

JP2004157647A 2004-05-27 2004-05-27 Ac/dc converter Pending JP2005341722A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009078148A1 (en) * 2007-12-17 2009-06-25 Panasonic Corporation Power conversion circuit
CN102097968A (en) * 2009-11-26 2011-06-15 富士电机控股株式会社 Rectifier circuit
KR20200141289A (en) * 2019-06-10 2020-12-18 엘지전자 주식회사 Power converting apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009078148A1 (en) * 2007-12-17 2009-06-25 Panasonic Corporation Power conversion circuit
CN101675579A (en) * 2007-12-17 2010-03-17 松下电器产业株式会社 Power conversion circuit
US8159848B2 (en) 2007-12-17 2012-04-17 Panasonic Corporation Power conversion circuit
CN101675579B (en) * 2007-12-17 2013-08-28 松下电器产业株式会社 Power conversion circuit
CN102097968A (en) * 2009-11-26 2011-06-15 富士电机控股株式会社 Rectifier circuit
JP2011135758A (en) * 2009-11-26 2011-07-07 Fuji Electric Co Ltd Rectifier circuit
KR20200141289A (en) * 2019-06-10 2020-12-18 엘지전자 주식회사 Power converting apparatus
KR102290302B1 (en) * 2019-06-10 2021-08-17 엘지전자 주식회사 Power converting apparatus

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