JP7030070B2

JP7030070B2 - Power converter

Info

Publication number: JP7030070B2
Application number: JP2019000331A
Authority: JP
Inventors: 俊緯呉; 佳宏白; 建綱張
Original assignee: 協欣電子工業股▲ふん▼有限公司
Priority date: 2019-01-04
Filing date: 2019-01-04
Publication date: 2022-03-04
Anticipated expiration: 2039-01-04
Also published as: JP2020110023A

Description

本発明は、電力変換装置に関し、特に制御信号を用いて、位相変換後の電流が連続せず、出力された交流電力の全高調波歪（ＴＨＤ）が大きいという問題を緩和する装置に関する。 The present invention relates to a power conversion device, particularly to a device that alleviates the problem that the current after phase conversion is not continuous and the total harmonic distortion (THD) of the output AC power is large by using a control signal.

米国登録特許第ＵＳ６３１０７８７号、米国登録特許第ＵＳ６１８１５８１号、欧州登録特許第ＥＰ１９６９６９４号等の特許は、電力変換装置を開示している。これらの電力変換装置は、電力の制御を行うものであるか、出力された交流電力は位相変換後の電流が連続せず、出力された交流電力の全高調波歪が大きいという問題を抱えていた。 Patents such as US Registered Patent No. US6310787, US Registered Patent No. US6181581, and European Registered Patent No. EP1969644 disclose power conversion devices. These power conversion devices control the power, or the output AC power has a problem that the current after the phase conversion is not continuous and the total harmonic distortion of the output AC power is large. rice field.

本発明は、従来の回路において出力された交流電力は位相変換後の電流が連続せず、全高調波歪が大きいという問題を解決するためになされたものである。 The present invention has been made to solve the problem that the AC power output in the conventional circuit does not have a continuous current after phase conversion and the total harmonic distortion is large.

上記課題を解決するための本発明は、電力変換装置を提供する。交流電力入力バスと、交流電力出力バスと、中性バスと、前記交流電力入力バスと前記中性バスとに接続された第１のコンデンサと、前記交流電力入力バスに接続された第１のインダクタと、第１のバスバーと、第２のバスバーと、前記第１のバスバーと前記第２のバスバーとに接続された第２のコンデンサと、第１のハーフブリッジ回路と、第２のハーフブリッジ回路と、第３のハーフブリッジ回路と、第２のインダクタと、コントローラとを含む。前記第１のハーフブリッジ回路は前記第１のバスバーに接続された第１のスイッチと、前記第１のスイッチに直列に接続され且つ前記第２のバスバーに接続された第２のスイッチとを含み、前記第１のインダクタが前記第１のスイッチと前記第２のスイッチとの間に接続され、前記第２のハーフブリッジ回路は前記第１のバスバーに接続された第３のスイッチと、前記第３のスイッチに直列に接続され且つ前記第２のバスバーに接続された第４のスイッチとを含み、前記第３のスイッチと前記第４のスイッチとの間に前記交流電力出力バスが接続され、前記第３のハーフブリッジ回路は前記第１のバスバーに接続された第５のスイッチと、前記第５のスイッチに直列に接続され且つ前記第２のバスバーに接続された第６のスイッチとを含み、前記第２のインダクタの一端が前記第５のスイッチと前記第６のスイッチとの間に接続され、他端が前記中性バスに接続される。前記コントローラは前記第１のスイッチと、前記第２のスイッチと、前記第３のスイッチと、前記第４のスイッチと、前記第５のスイッチと、前記第６のスイッチとに制御信号を提供する。前記コントローラが前記第２のハーフブリッジ回路又は前記第３のハーフブリッジ回路に提供する前記制御信号は、混合した正弦波（以下、混合正弦波という）と高周波三角波キャリアとを比較して発生されるものであり、前記混合正弦波は低周波正弦波に前記低周波正弦波の第３高調波を混合して発生されるものであり、前記第１のハーフブリッジ回路及び前記第２のハーフブリッジ回路にて変調させる前記制御信号における前記低周波正弦波の位相は前記第３のハーフブリッジ回路にて変調させる前記制御信号における前記低周波正弦波と逆である。 The present invention for solving the above problems provides a power conversion device. An AC power input bus, an AC power output bus, a neutral bus, a first capacitor connected to the AC power input bus and the neutral bus, and a first capacitor connected to the AC power input bus. An inductor, a first bus bar, a second bus bar, a second capacitor connected to the first bus bar and the second bus bar, a first half-bridge circuit, and a second half bridge. It includes a circuit, a third half-bridge circuit, a second inductor, and a controller. The first half-bridge circuit includes a first switch connected to the first bus bar and a second switch connected in series with the first switch and connected to the second bus bar. The first inductor is connected between the first switch and the second switch, and the second half-bridge circuit is the third switch connected to the first bus bar and the first switch. The AC power output bus is connected between the third switch and the fourth switch, including a fourth switch connected in series to the third switch and connected to the second bus bar. The third half-bridge circuit includes a fifth switch connected to the first bus bar and a sixth switch connected in series with the fifth switch and connected to the second bus bar. One end of the second inductor is connected between the fifth switch and the sixth switch, and the other end is connected to the neutral bus. The controller provides control signals to the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch. .. The control signal provided by the controller to the second half-bridge circuit or the third half-bridge circuit is generated by comparing a mixed sine wave (hereinafter referred to as a mixed sine wave) with a high-frequency triangular wave carrier. The mixed sine wave is generated by mixing a low frequency sine wave with a third harmonic of the low frequency sine wave, and is generated by the first half bridge circuit and the second half bridge circuit. The phase of the low frequency sine wave in the control signal modulated by the third half bridge circuit is opposite to that of the low frequency sine wave in the control signal modulated by the third half bridge circuit.

本発明に係る装置の一つの実施形態において、前記電力変換装置は、前記交流電力出力バスと、前記第３のスイッチと前記第４のスイッチとの間とに接続された第３のインダクタと、前記交流電力出力バスと前記中性バスとの間に接続され且つ前記第３のインダクタとフィルタ回路を構成する第３のコンデンサとを含む。 In one embodiment of the apparatus according to the present invention, the power conversion apparatus comprises an AC power output bus, a third inductor connected between the third switch and the fourth switch, and a third inductor. It includes the third inductor connected between the AC power output bus and the neutral bus and a third capacitor constituting the filter circuit.

本発明に係る装置の一つの実施形態において、前記低周波正弦波の周波数は、前記電力変換装置に入力されるか、又は、前記電力変換装置によって出力される出力交流電力の周波数と同じである。 In one embodiment of the apparatus according to the present invention, the frequency of the low frequency sine wave is the same as the frequency of the output AC power input to the power conversion device or output by the power conversion device. ..

本発明に係る装置の一つの実施形態において、前記コントローラが前記第１のスイッチと、前記第２のスイッチと、前記第３のスイッチと、前記第４のスイッチとに提供する前記制御信号はそれぞれ前記低周波正弦波と前記高周波三角波キャリアとを比較して発生されるものである。 In one embodiment of the apparatus according to the present invention, the control signals provided by the controller to the first switch, the second switch, the third switch, and the fourth switch are respectively. It is generated by comparing the low-frequency sine wave with the high-frequency triangular wave carrier.

本発明に係る装置の一つの実施形態において、前記電力変換装置は第１の差動アンプと、第２の差動アンプと、第３の差動アンプと、前記交流電力入力バスと前記第１のインダクタとに直列に接続され且つ前記コントローラに入力電流信号を出力する第１の電流検出素子と、前記交流電力出力バスに直列に接続され且つ前記コントローラに出力電流信号を出力する第２の電流検出素子と、前記交流電力出力バスと、前記第３のスイッチと前記第４のスイッチとの間とに接続された第３のインダクタと、前記交流電力出力バスと前記中性バスとの間に接続され且つ前記第３のインダクタとフィルタ回路を構成する第３のコンデンサと、前記第３のスイッチと前記第４のスイッチとの間に接続され且つ前記第３のインダクタに直列に接続されて前記コントローラに転流電流信号を出力する第３の電流検出素子とを含む。前記第１の差動アンプは前記交流電力入力バスに接続された第１の入力端子と、前記中性バスに接続された第２の入力端子と、前記コントローラに入力電圧信号を提供する第１の出力端子とを含み、前記第２の差動アンプは前記交流電力出力バスに接続された第３の入力端子と、前記中性バスに接続された第４の入力端子と、前記コントローラに出力電圧信号を提供する第２の出力端子とを含み、前記第３の差動アンプは前記第１のバスバーに接続された第５の入力端子と、前記第２のバスバーに接続された第６の入力端子と、前記コントローラにバスバー電圧信号を提供する第３の出力端子とを含み、前記コントローラは前記入力電流信号と、前記入力電圧信号と、前記バスバー電圧信号とに基づいて前記第１のハーフブリッジ回路に出力する制御信号を調整し、且つ前記出力電流信号と、前記出力電圧信号と、前記転流電流信号とに基づいて前記第２のハーフブリッジ回路に出力する制御信号を調整する。 In one embodiment of the apparatus according to the present invention, the power conversion device includes a first differential amplifier, a second differential amplifier, a third differential amplifier, the AC power input bus, and the first differential amplifier. A first current detection element connected in series with the inductor and outputting an input current signal to the controller, and a second current connected in series with the AC power output bus and outputting an output current signal to the controller. Between the detection element, the AC power output bus, the third inductor connected between the third switch and the fourth switch, and between the AC power output bus and the neutral bus. The third capacitor connected to the third inductor and constituting the filter circuit is connected between the third switch and the fourth switch, and is connected in series with the third inductor. It includes a third current detecting element that outputs a commutation current signal to the controller. The first differential amplifier provides a first input terminal connected to the AC power input bus, a second input terminal connected to the neutral bus, and an input voltage signal to the controller. The second differential amplifier includes a third input terminal connected to the AC power output bus, a fourth input terminal connected to the neutral bus, and outputs to the controller. The third differential amplifier includes a second output terminal that provides a voltage signal, and the third differential amplifier has a fifth input terminal connected to the first bus bar and a sixth input terminal connected to the second bus bar. The controller includes an input terminal and a third output terminal that provides a bus bar voltage signal to the controller, wherein the controller is based on the input current signal, the input voltage signal, and the bus bar voltage signal. The control signal to be output to the bridge circuit is adjusted, and the control signal to be output to the second half bridge circuit is adjusted based on the output current signal, the output voltage signal, and the commutation current signal.

本発明に係る装置の一つの実施形態において、前記第１の入力端子と、前記第２の入力端子と、前記第３の入力端子と、前記第４の入力端子と、前記第５の入力端子と、前記第６の入力端子とには、直列接続分圧抵抗がそれぞれ設けられ、各前記直列接続分圧抵抗は少なくとも２つの抵抗からなる。 In one embodiment of the apparatus according to the present invention, the first input terminal, the second input terminal, the third input terminal, the fourth input terminal, and the fifth input terminal. A series connection voltage dividing resistor is provided at each of the sixth input terminal, and each series connection voltage dividing resistor is composed of at least two resistors.

本発明に係る装置の一つの実施形態において、前記電力変換装置は前記第１のバスバーと前記第２のバスバーとに接続された直流電力変換回路を有する。 In one embodiment of the apparatus according to the present invention, the power conversion device has a DC power conversion circuit connected to the first bus bar and the second bus bar.

上述した内容より、本発明は従来技術に比べて以下の利点を有することが明らかになる。本発明に係る電力変換装置において、第１のハーフブリッジ回路、第２のハーフブリッジ回路及び第３のハーフブリッジ回路はいずれも高周波切替制御を採用し、且つ第３のハーフブリッジ回路を制御する制御信号が混合正弦波と高周波三角波キャリアとを比較して発生され、混合正弦波が低周波正弦波に低周波正弦波の第３高調波を混合して発生されるように構成することにより、出力交流電力が位相を変換する時（すなわち位相角が３５５～５度である時又は位相角が１７５～１８５度である時）の出力電流が連続し、且つ安定的な位相変換を実現できるという利点を有する。また、本発明による装置は、出力交流電力の全高調波歪が大きいという問題を解決することができる。 From the above-mentioned contents, it becomes clear that the present invention has the following advantages over the prior art. In the power conversion device according to the present invention, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit all employ high-frequency switching control and control the third half-bridge circuit. The output is configured so that the signal is generated by comparing a mixed sine wave with a high frequency triangular carrier and the mixed sine wave is generated by mixing the low frequency sine wave with the third harmonic of the low frequency sine wave. The advantage that the output current is continuous when the AC power converts the phase (that is, when the phase angle is 355 to 5 degrees or when the phase angle is 175 to 185 degrees), and stable phase conversion can be realized. Has. Further, the apparatus according to the present invention can solve the problem that the total harmonic distortion of the output AC power is large.

本発明の一実施形態による電力変換装置の回路構成を概略的に示す図である。It is a figure which shows schematic the circuit structure of the power conversion apparatus by one Embodiment of this invention. 本発明の一実施形態による電力変換装置においてコントローラが制御信号を発生することを概略的に示す図である。It is a figure which shows schematically that the controller generates a control signal in the power conversion apparatus by one Embodiment of this invention. 本発明の一実施形態による電力変換装置における各制御信号の発生を概略的に示す図である。It is a figure which shows schematic the generation of each control signal in the power conversion apparatus by one Embodiment of this invention. 本発明の一実施形態による電力変換装置における各制御信号と出力交流電力との波形を比較する図である。It is a figure which compares the waveform of each control signal and output AC power in the power conversion apparatus by one Embodiment of this invention. 本発明のもう一つの実施形態による電力変換装置においてコントローラが制御信号を発生することを概略的に示す図である。It is a figure which shows schematically that the controller generates a control signal in the power conversion apparatus according to another embodiment of this invention. 本発明のもう一つの実施形態による電力変換装置における各制御信号と出力交流電力との波形を比較する図である。It is a figure which compares the waveform of each control signal and output AC power in the power conversion apparatus by another embodiment of this invention. 本発明のさらにもう一つの実施形態による電力変換装置の回路構成を概略的に示す図である。It is a figure which shows schematic the circuit structure of the power conversion apparatus according to still another embodiment of this invention. 本発明の一実施形態による電力変換装置の第１の差動アンプを概略的に示す図である。It is a figure which shows typically the 1st differential amplifier of the power conversion apparatus by one Embodiment of this invention. 本発明のさらにもう一つの実施形態による電力変換装置の回路構成を概略的に示す図である。It is a figure which shows schematic the circuit structure of the power conversion apparatus according to still another embodiment of this invention.

以下各図を参照しながら、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to each figure.

図１～図４に示すように、本発明は電力変換装置１００を提供する。電力変換装置１００は、無停電電源装置又は通信機器に設置され、且つ当該装置を並列に接続することにより複数を具備するように実施してもよい。電力変換装置１００は、交流電力入力バス１１と、交流電力出力バス１２と、中性バス１３と、交流電力入力バス１１と中性バス１３とに接続された第１のコンデンサ１４と、交流電力入力バス１１に接続された第１のインダクタ１５と、第１のバスバー１６と、第２のバスバー１７と、第１のバスバー１６と第２のバスバー１７とに接続された第２のコンデンサ１８と、第１のハーフブリッジ回路１９と、第２のハーフブリッジ回路２０と、第３のハーフブリッジ回路２１と、第２のインダクタ２２と、コントローラ２３とを含む。交流電力入力バス１１及び中性バス１３が交流電源５０の正端子、負端子にそれぞれ接続され、交流電力出力バス１２及び中性バス１３は、負荷５１の一端にそれぞれ接続されて負荷５１に出力交流電力５２を提供する。第１のハーフブリッジ回路１９は、第１のバスバー１６に接続された第１のスイッチ１９１と、第１のスイッチ１９１に直列に接続され且つ第２のバスバー１７に接続された第２のスイッチ１９２とを含み、第１のインダクタ１５が第１のスイッチ１９１と第２のスイッチ１９２との間に接続される。第２のハーフブリッジ回路２０は第１のバスバー１６に接続された第３のスイッチ２０１と、第３のスイッチ２０１に直列に接続され且つ第２のバスバー１７に接続された第４のスイッチ２０２とを含み、第３のスイッチ２０１と第４のスイッチ２０２との間に交流電力出力バス１２が接続される。第３のハーフブリッジ回路２１は第１のバスバー１６に接続された第５のスイッチ２１１と、第５のスイッチ２１１に直列に接続され且つ第２のバスバー１７に接続された第６のスイッチ２１２とを含み、第２のインダクタ２２の一端が第５のスイッチ２１１と第６のスイッチ２１２との間に接続され、他端が中性バス１３に接続される。さらに、第１のスイッチ１９１、第２のスイッチ１９２、第３のスイッチ２０１、第４のスイッチ２０２、第５のスイッチ２１１及び第６のスイッチ２１２はそれぞれＭＯＳ電界効果トランジスタ（ＭＯＳＦＥＴ）又は絶縁ゲートバイポーラトランジスタ（ＩＧＢＴ）であってもよい。さらに、本発明に係る電力変換装置１００において、第１のコンデンサ１４と、第１のインダクタ１５と、第２のインダクタ２２と、第１のスイッチ１９１と、第２のスイッチ１９２と、第５のスイッチ２１１と、第６のスイッチ２１２とにより整流回路４０を構成し、また、第２のインダクタ２２と、第３のインダクタ２９と、第３のスイッチ２０１と、第４のスイッチ２０２と、第５のスイッチ２１１と、第６のスイッチ２１２とによりコンバータ回路４１を構成する。整流回路４０は、交流電力を直流電力に変換し、コンバータ回路４１は直流電力を交流電力に変換する。 As shown in FIGS. 1 to 4, the present invention provides a power conversion device 100. The power conversion device 100 may be installed in an uninterruptible power supply device or a communication device, and may be implemented so as to include a plurality of the power conversion devices 100 by connecting the devices in parallel. The power conversion device 100 includes an AC power input bus 11, an AC power output bus 12, a neutral bus 13, a first capacitor 14 connected to the AC power input bus 11 and the neutral bus 13, and AC power. A first inductor 15 connected to the input bus 11, a first bus bar 16, a second bus bar 17, and a second capacitor 18 connected to the first bus bar 16 and the second bus bar 17. , A first half-bridge circuit 19, a second half-bridge circuit 20, a third half-bridge circuit 21, a second inductor 22, and a controller 23. The AC power input bus 11 and the neutral bus 13 are connected to the positive and negative terminals of the AC power supply 50, respectively, and the AC power output bus 12 and the neutral bus 13 are connected to one end of the load 51 and output to the load 51, respectively. The AC power 52 is provided. The first half-bridge circuit 19 has a first switch 191 connected to the first bus bar 16 and a second switch 192 connected in series to the first switch 191 and connected to the second bus bar 17. The first inductor 15 is connected between the first switch 191 and the second switch 192. The second half-bridge circuit 20 includes a third switch 201 connected to the first bus bar 16 and a fourth switch 202 connected in series to the third switch 201 and connected to the second bus bar 17. The AC power output bus 12 is connected between the third switch 201 and the fourth switch 202. The third half-bridge circuit 21 includes a fifth switch 211 connected to the first bus bar 16 and a sixth switch 212 connected in series to the fifth switch 211 and connected to the second bus bar 17. One end of the second inductor 22 is connected between the fifth switch 211 and the sixth switch 212, and the other end is connected to the neutral bus 13. Further, the first switch 191 and the second switch 192, the third switch 201, the fourth switch 202, the fifth switch 211 and the sixth switch 212 are MOS field effect transistors (MOSFETs) or insulated gate bipolar transistors, respectively. It may be a transistor (IGBT). Further, in the power conversion device 100 according to the present invention, the first capacitor 14, the first inductor 15, the second inductor 22, the first switch 191 and the second switch 192, and the fifth The switch 211 and the sixth switch 212 form a rectifier circuit 40, and the second inductor 22, the third inductor 29, the third switch 201, the fourth switch 202, and the fifth. The converter circuit 41 is configured by the switch 211 of the above and the sixth switch 212. The rectifier circuit 40 converts AC power into DC power, and the converter circuit 41 converts DC power into AC power.

さらに、図１～図４に示すように、コントローラ２３はマイクロコントローラ（ＭＣＵ）であり、コントローラ２３は、第１のスイッチ１９１と、第２のスイッチ１９２と、第３のスイッチ２０１と、第４のスイッチ２０２と、第５のスイッチ２１１と、第６のスイッチ２１２とにそれぞれ接続され、且つ起動した後に第１のスイッチ１９１と、第２のスイッチ１９２と、第３のスイッチ２０１と、第４のスイッチ２０２と、第５のスイッチ２１１と、第６のスイッチ２１２とにそれぞれ制御信号（６０、６１、６２、６３、６４、６５）を出力し、各制御信号（６０、６１、６２、６３、６４、６５）がそれぞれパルス幅変調（ＰＷＭ）により発生され、第１のスイッチ１９１と、第２のスイッチ１９２と、第３のスイッチ２０１と、第４のスイッチ２０２と、第５のスイッチ２１１と、第６のスイッチ２１２とが制御信号（６０、６１、６２、６３、６４、６５）の一つを受信するとオン状態又はオフ状態になるように構成される。さらに、本発明に係る装置の一つの実施形態において、出力交流電力５２の全高調波歪を解消して、出力電流が連続しないという問題を解決するために、コントローラ２３が第３のハーフブリッジ回路２１に提供する制御信号６４、６５は、混合正弦波７０と高周波三角波キャリア７１とを比較して発生され、混合正弦波７０は、低周波正弦波７２に低周波正弦波７２の第３高調波（図中７３）を混合して発生されるものである。第３高調波７３は正弦波であり、且つその周波数が低周波正弦波７２より高い。第５のスイッチ２１１及び第６のスイッチ２１２が受信した制御信号６４、６５は逆の位相である。すなわち、第５のスイッチ２１１がオンした時に、第６のスイッチ２１２がオフし、第５のスイッチ２１１がオフした時に、第６のスイッチ２１２がオンするように設定されてもよい。低周波正弦波７２の周波数は、電力変換装置１００に入力されるか、又は、電力変換装置１００によって出力される出力交流電力５２の周波数と同じである。例えば、出力交流電力５２の周波数が５０Ｈｚであれば、低周波正弦波７２の周波数は５０Ｈｚである。また、コントローラ２３が第１のスイッチ１９１と、第２のスイッチ１９２と、第３のスイッチ２０１と、第４のスイッチ２０２とに提供する制御信号（６０、６１、６２、６３）は、別の低周波正弦波７４と高周波三角波キャリア７１とを比較して発生されるものである。なお、本発明の各実施形態に係る電力変換装置において、第１のハーフブリッジ回路１９及び第２のハーフブリッジ回路２０にて変調させる制御信号（６０、６１、６２、６３）における低周波正弦波７４の位相は、第３のハーフブリッジ回路２１にて変調させる制御信号６４、６５の低周波正弦波と逆である。図３（Ａ）、図３（Ｃ）は第１のハーフブリッジ回路１９及び第２のハーフブリッジ回路２０に制御信号６０、６１、６２、６３を出力して変調させることを概略的に示し、図３（Ｂ）は第３のハーフブリッジ回路２１に制御信号６４、６５を出力して変調させることを概略的に示している。なお、第１のスイッチ１９１及び第２のスイッチ１９２が受信した制御信号６０、６１は、逆の位相に設定されてもよい。第３のスイッチ２０１及び第４のスイッチ２０２が受信した制御信号６２、６３は、逆の位相に設定されてもよい。このように設定するのは、ハーフブリッジ回路に短絡が生じることを避けるためであり、これについては当業者にとって自明であるため、詳細な説明を省略する。 Further, as shown in FIGS. 1 to 4, the controller 23 is a micro controller (MCU), and the controller 23 includes a first switch 191 and a second switch 192, a third switch 201, and a fourth switch. Switch 202, fifth switch 211, and sixth switch 212, respectively, and after activation, the first switch 191 and the second switch 192, the third switch 201, and the fourth switch. Control signals (60, 61, 62, 63, 64, 65) are output to the switch 202, the fifth switch 211, and the sixth switch 212, respectively, and each control signal (60, 61, 62, 63) is output. , 64, 65) are generated by pulse width modulation (PWM), respectively, and the first switch 191 and the second switch 192, the third switch 201, the fourth switch 202, and the fifth switch 211 are generated. And, when the sixth switch 212 receives one of the control signals (60, 61, 62, 63, 64, 65), it is configured to be in the on state or the off state. Further, in one embodiment of the apparatus according to the present invention, in order to eliminate the total harmonic distortion of the output AC power 52 and solve the problem that the output current is not continuous, the controller 23 is a third half bridge circuit. The control signals 64 and 65 provided to 21 are generated by comparing the mixed sine wave 70 and the high frequency triangular wave carrier 71, and the mixed sine wave 70 is the third harmonic of the low frequency sine wave 72 and the low frequency sine wave 72. (73 in the figure) is mixed and generated. The third harmonic 73 is a sine wave, and its frequency is higher than that of the low frequency sine wave 72. The control signals 64 and 65 received by the fifth switch 211 and the sixth switch 212 are in opposite phases. That is, the sixth switch 212 may be set to turn off when the fifth switch 211 is turned on, and the sixth switch 212 may be set to turn on when the fifth switch 211 is turned off. The frequency of the low frequency sine wave 72 is the same as the frequency of the output AC power 52 input to the power conversion device 100 or output by the power conversion device 100. For example, if the frequency of the output AC power 52 is 50 Hz, the frequency of the low frequency sine wave 72 is 50 Hz. Further, the control signals (60, 61, 62, 63) provided by the controller 23 to the first switch 191 and the second switch 192, the third switch 201, and the fourth switch 202 are different. It is generated by comparing the low frequency sine wave 74 and the high frequency triangular wave carrier 71. In the power conversion device according to each embodiment of the present invention, the low frequency sine wave in the control signal (60, 61, 62, 63) modulated by the first half bridge circuit 19 and the second half bridge circuit 20. The phase of 74 is opposite to the low frequency sine wave of the control signals 64, 65 modulated by the third half-bridge circuit 21. 3 (A) and 3 (C) schematically show that the control signals 60, 61, 62, 63 are output and modulated by the first half-bridge circuit 19 and the second half-bridge circuit 20. FIG. 3B schematically shows that control signals 64 and 65 are output to the third half-bridge circuit 21 for modulation. The control signals 60 and 61 received by the first switch 191 and the second switch 192 may be set in opposite phases. The control signals 62 and 63 received by the third switch 201 and the fourth switch 202 may be set in opposite phases. The reason for setting in this way is to avoid a short circuit in the half-bridge circuit, which is obvious to those skilled in the art, and detailed description thereof will be omitted.

図５に示すように、上記形態で実施する以外に、コントローラ２３が第３のハーフブリッジ回路２１に提供する制御信号６４、６５は、前記信号の変調方式を採用しなくてもよい。すなわち、制御信号６４、６５を発生させる時に混合正弦波７０を使用しないように実施してもよい。当該実施形態に係る装置において、コントローラ２３が第２のハーフブリッジ回路２０に提供する制御信号６２、６３は、混合正弦波７５と高周波三角波キャリア７１とを比較して発生され、混合正弦波７５は同じく、低周波正弦波７４に低周波正弦波７４の第３高調波（図中７６）を混合して発生されるものである。なお、当該実施形態に係る装置において、第１のハーフブリッジ回路１９を制御する制御信号６０、６１は、高周波制御信号であってもよく、第３のハーフブリッジ回路２１を制御する制御信号６４、６５は、実施時の要件に応じて、高周波制御信号又は低周波制御信号であってもよい。さらに図６に示すように、本発明に係る装置の一つの実施形態において、制御信号６４、６５は基本的に低周波数であり、制御信号６４、６５の制御電位を切り替える時点は、出力交流電力５２の位相角が１７５～１８５度又は３５５～５度にある時に対応し、前記２つの区間で制御信号６４、６５を高周波数にして実施する。 As shown in FIG. 5, other than the above embodiment, the control signals 64 and 65 provided by the controller 23 to the third half-bridge circuit 21 do not have to adopt the signal modulation method. That is, the mixed sine wave 70 may not be used when the control signals 64 and 65 are generated. In the apparatus according to the embodiment, the control signals 62 and 63 provided by the controller 23 to the second half bridge circuit 20 are generated by comparing the mixed sine wave 75 and the high frequency triangular wave carrier 71, and the mixed sine wave 75 is generated. Similarly, it is generated by mixing the low frequency sine wave 74 with the third harmonic of the low frequency sine wave 74 (76 in the figure). In the apparatus according to the embodiment, the control signals 60 and 61 for controlling the first half-bridge circuit 19 may be high-frequency control signals, and the control signals 64 for controlling the third half-bridge circuit 21. Reference numeral 65 may be a high frequency control signal or a low frequency control signal, depending on the requirements at the time of implementation. Further, as shown in FIG. 6, in one embodiment of the apparatus according to the present invention, the control signals 64 and 65 are basically low frequencies, and at the time when the control potentials of the control signals 64 and 65 are switched, the output AC power is used. Corresponding to the case where the phase angle of 52 is 175 to 185 degrees or 355 to 5 degrees, the control signals 64 and 65 are set to high frequencies in the above two sections.

図７に示すように、本発明に係る装置の一つの実施形態において、電力変換装置１００は、第１の差動アンプ２４と、第２の差動アンプ２５と、第３の差動アンプ２６と、交流電力入力バス１１と第１のインダクタ１５とに直列に接続され且つコントローラ２３に入力電流信号８０を出力する第１の電流検出素子２７と、交流電力出力バス１２に直列に接続され且つコントローラ２３に出力電流信号８１を出力する第２の電流検出素子２８とを含む。第１の差動アンプ２４は、交流電力入力バス１１に接続された第１の入力端子２４１と、中性バス１３に接続された第２の入力端子２４２と、コントローラ２３に入力電圧信号８２を提供する第１の出力端子２４３とを含む。第２の差動アンプ２５は、交流電力出力バス１２に接続された第３の入力端子２５１と、中性バス１３に接続された第４の入力端子２５２と、コントローラ２３に出力電圧信号８３を提供する第２の出力端子２５３とを含む。第３の差動アンプ２６は、第１のバスバー１６に接続された第５の入力端子２６１と、第２のバスバー１７に接続された第６の入力端子２６２と、コントローラ２３にバスバー電圧信号８４を提供する第３の出力端子２６３とを含む。このように構成することにより、コントローラ２３は、動作状態に応じて、第１のスイッチ１９１と、第２のスイッチ１９２と、第３のスイッチ２０１と、第４のスイッチ２０２とに対する制御を調整して、補償を行うことができる。図８に示すように、本発明に係る装置の一つの実施形態において、第１の入力端子２４１、第２の入力端子２４２には、直列接続分圧抵抗２４４、２４５がそれぞれ設けられ、各直列接続分圧抵抗２４４（２４５）は少なくとも２つの抵抗からなる。関連する図には第１の入力端子２４１及び第２の入力端子２４２に直列接続分圧抵抗２４４、２４５が設けられた形態を示しているが、本発明に係る装置を実施する際に、第３の入力端子２５１と、第４の入力端子２５２と、第５の入力端子２６１と、第６の入力端子２６２とにも、図示していない前記直列接続分圧抵抗を設けてもよい。このように構成することにより、直列接続分圧抵抗２４４、２４５によって、入力された電圧又は電流を分担することができる。 As shown in FIG. 7, in one embodiment of the apparatus according to the present invention, the power conversion device 100 includes a first differential amplifier 24, a second differential amplifier 25, and a third differential amplifier 26. And the first current detection element 27 connected in series to the AC power input bus 11 and the first inductor 15 and outputting the input current signal 80 to the controller 23, and connected in series to the AC power output bus 12. It includes a second current detecting element 28 that outputs an output current signal 81 to the controller 23. The first differential amplifier 24 provides a first input terminal 241 connected to the AC power input bus 11, a second input terminal 242 connected to the neutral bus 13, and an input voltage signal 82 to the controller 23. Includes a first output terminal 243 to provide. The second differential amplifier 25 provides a third input terminal 251 connected to the AC power output bus 12, a fourth input terminal 252 connected to the neutral bus 13, and an output voltage signal 83 to the controller 23. Includes a second output terminal 253 provided. The third differential amplifier 26 has a fifth input terminal 261 connected to the first bus bar 16, a sixth input terminal 262 connected to the second bus bar 17, and a bus bar voltage signal 84 to the controller 23. Includes a third output terminal 263 and the like. With this configuration, the controller 23 adjusts the control of the first switch 191 and the second switch 192, the third switch 201, and the fourth switch 202 according to the operating state. And compensation can be made. As shown in FIG. 8, in one embodiment of the apparatus according to the present invention, the first input terminal 241 and the second input terminal 242 are provided with series connection voltage dividing resistors 244 and 245, respectively, in series. The connection voltage dividing resistor 244 (245) consists of at least two resistors. The related figure shows a mode in which the first input terminal 241 and the second input terminal 242 are provided with the series connection voltage dividing resistors 244 and 245. The series connection voltage dividing resistor (not shown) may also be provided in the input terminal 251 of 3, the fourth input terminal 252, the fifth input terminal 261 and the sixth input terminal 262. With this configuration, the input voltage or current can be shared by the series connection voltage dividing resistors 244 and 245.

図１～図５を参照すると、前述したように、電力変換装置１００は、交流電力出力バス１２と、第３のスイッチ２０１と第４のスイッチ２０２との間に接続された第３のインダクタ２９と、交流電力出力バス１２と中性バス１３との間に接続され且つ第３のインダクタ２９とフィルタ回路４２を構成する第３のコンデンサ３０とをさらに含む。このように構成することにより、コンバータ回路４１におけるノイズをフィルタリングして除去することができる。さらに、当該実施形態に係る装置において、電力変換装置１００は、第３のスイッチ２０１と第４のスイッチ２０２との間に接続され且つ第３のインダクタ２９に直列に接続されてコントローラ２３に転流電流信号８５を出力する第３の電流検出素子３１をさらに含む。コントローラ２３は、入力電流信号８０と、入力電圧信号８２と、バスバー電圧信号８４とに基づいて第１のハーフブリッジ回路１９に出力する制御信号６０、６１を調整し、且つ出力電流信号８１と、出力電圧信号８３と、転流電流信号８５とに基づいて第２のハーフブリッジ回路２０に出力する制御信号６２、６３を調整する。 Referring to FIGS. 1 to 5, as described above, in the power conversion device 100, the AC power output bus 12 and the third inductor 29 connected between the third switch 201 and the fourth switch 202 are connected. Further includes a third inductor 29 connected between the AC power output bus 12 and the neutral bus 13 and a third capacitor 30 constituting the filter circuit 42. With this configuration, noise in the converter circuit 41 can be filtered and removed. Further, in the device according to the embodiment, the power conversion device 100 is connected between the third switch 201 and the fourth switch 202 and is connected in series with the third inductor 29 and commutated to the controller 23. A third current detecting element 31 that outputs a current signal 85 is further included. The controller 23 adjusts the control signals 60 and 61 to be output to the first half bridge circuit 19 based on the input current signal 80, the input voltage signal 82, and the bus bar voltage signal 84, and the output current signal 81 and the output current signal 81. The control signals 62 and 63 to be output to the second half bridge circuit 20 are adjusted based on the output voltage signal 83 and the commutation current signal 85.

図９に示すように、本発明に係る装置の一つの実施形態において、電力変換装置１００は、第１のバスバー１６と第２のバスバー１７とに接続された直流電力変換回路３２をさらに含む。直流電力変換回路３２は、直流電力の変調のために用いるか、又はそれに含まれるエネルギー貯蔵素子で充電することにより、電力変換装置１００の予備電源として用いることができる。前記エネルギー貯蔵素子は、バッテリ又は電気二重層コンデンサなどである。 As shown in FIG. 9, in one embodiment of the apparatus according to the present invention, the power conversion device 100 further includes a DC power conversion circuit 32 connected to the first bus bar 16 and the second bus bar 17. The DC power conversion circuit 32 can be used as a standby power source for the power conversion device 100 by using it for modulation of DC power or by charging it with an energy storage element included therein. The energy storage element is a battery, an electric double layer capacitor, or the like.

上述した内容より分かるように、本発明に係る電力変換装置は、第２のハーフブリッジ回路２０又は第３のハーフブリッジ回路２１の制御信号６２、６３、６４、６５が混合正弦波７０（又は７５）と高周波三角波キャリア７１とを比較して発生されるように構成することにより、出力交流電力５２が位相を変換する時（すなわち位相角が３５５～５度で時又は位相角が１７５～１８５である時）の出力電流が連続し、安定的な位相変換を実現できるという利点を有し、また、出力交流電力５２の全高調波歪を低減することができる。 As can be seen from the above, in the power conversion device according to the present invention, the control signals 62, 63, 64, 65 of the second half bridge circuit 20 or the third half bridge circuit 21 are mixed sine waves 70 (or 75). ) And the high-frequency triangular wave carrier 71 are configured to be generated in comparison with each other, so that when the output AC power 52 converts the phase (that is, when the phase angle is 355 to 5 degrees and the phase angle is 175 to 185). It has the advantage that the output current (at a certain time) is continuous and stable phase conversion can be realized, and the total harmonic distortion of the output AC power 52 can be reduced.

１００電力変換装置
１１交流電力入力バス
１２交流電力出力バス
１３中性バス
１４第１のコンデンサ
１５第１のインダクタ
１６第１のバスバー
１７第２のバスバー
１８第２のコンデンサ
１９第１のハーフブリッジ回路
１９１第１のスイッチ
１９２第２のスイッチ
２０第２のハーフブリッジ回路
２０１第３のスイッチ
２０２第４のスイッチ
２１第３のハーフブリッジ回路
２１１第５のスイッチ
２１２第６のスイッチ
２２第２のインダクタ
２３コントローラ
２４第１の差動アンプ
２４１第１の入力端子
２４２第２の入力端子
２４３第１の出力端子
２４４、２４５各直列接続分圧抵抗
２５第２の差動アンプ
２５１第３の入力端子
２５２第４の入力端子
２５３第２の出力端子
２６第３の差動アンプ
２６１第５の入力端子
２６２第６の入力端子
２６３第３の出力端子
２７第１の電流検出素子
２８第２の電流検出素子
２９第３のインダクタ
３０第３のコンデンサ
３１第３の電流検出素子
３２直流電力変換回路
４０整流回路
４１コンバータ回路
４２フィルタ回路
５０交流電源
５１負荷
５２交流電力
６０、６１、６２、６３、６４、６５制御信号
７０混合正弦波
７１高周波三角波キャリア
７２低周波正弦波
７３第３高調波
７４低周波正弦波
７５混合正弦波
７６第３高調波
８０入力電流信号
８１出力電流信号
８２入力電圧信号
８３出力電圧信号
８４バスバー電圧信号
８５転流電流信号 100 Power converter 11 AC power input bus 12 AC power output bus 13 Neutral bus 14 First capacitor 15 First inductor 16 First bus bar 17 Second bus bar 18 Second capacitor 19 First half bridge circuit 191 1st switch 192 2nd switch 20 2nd half bridge circuit 201 3rd switch 202 4th switch 21 3rd half bridge circuit 211 5th switch 212 6th switch 22 2nd inductor 23 Controller 24 1st differential amplifier 241 1st input terminal 242 2nd input terminal 243 1st output terminal 244, 245 each series connection voltage dividing resistor 25 2nd differential amplifier 251 3rd input terminal 252nd 4 input terminal 253 2nd output terminal 26 3rd differential amplifier 261 5th input terminal 262 6th input terminal 263 3rd output terminal 27 1st current detection element 28 2nd current detection element 29 3rd inductor 30 3rd capacitor 31 3rd current detection element 32 DC power conversion circuit 40 Rectifier circuit 41 Converter circuit 42 Filter circuit 50 AC power supply 51 Load 52 AC power 60, 61, 62, 63, 64, 65 Control Signal 70 Mixed sine wave 71 High frequency triangular wave carrier 72 Low frequency sine wave 73 Third harmonic 74 Low frequency sine wave 75 Mixed sine wave 76 Third harmonic 80 Input current signal 81 Output current signal 82 Input voltage signal 83 Output voltage signal 84 Bus bar voltage signal 85 commutation current signal

Claims

The AC power input bus connected to the positive terminal of the AC power supply,
The AC power output bus connected to one end of the load,
A neutral bus whose ends are connected to the negative terminal of the AC power supply and the other end of the load, respectively.
A first capacitor connected to the AC power input bus and the neutral bus, respectively, at both ends.
A first bus bar installed between the AC power input bus and the AC power output bus, a second bus bar, and
A second capacitor, both ends of which are connected to the first bus bar and the second bus bar, respectively.
The AC power input bus includes a first switch connected to the first bus bar and a second switch connected in series with the first switch and connected to the second bus bar. A first half-bridge circuit configured to be connected between the first switch and the second switch,
The AC power output bus includes a third switch connected to the first bus bar and a fourth switch connected in series to the third switch and connected to the second bus bar. A second half-bridge circuit configured to be connected between the third switch and the fourth switch,
The neutral bus comprises a fifth switch connected to the first bus bar and a sixth switch connected in series to the fifth switch and connected to the second bus bar, wherein the neutral bus is the first. A third half-bridge circuit configured to be connected between the switch 5 and the sixth switch,
Installed between the AC power input bus and the first half-bridge circuit, one end is connected in series with the AC power input bus and the other end is between the first switch and the second switch. Connected to the first inductor and
It is installed between the neutral bus and the third half-bridge circuit, one end is connected between the fifth switch and the sixth switch, and the other end is connected to the neutral bus. With the second inductor,
A controller that provides a first control signal to the first half-bridge circuit, a second control signal to the second half-bridge circuit, and a third control signal to the third half-bridge circuit. The third control signal provided to the third half-bridge circuit is generated by comparing a mixed sine wave and a high-frequency triangular wave carrier, and the mixed sine wave is a first low-frequency sine wave. It is generated by mixing the third harmonic of the first low frequency sine wave with the wave, and is provided to the first control signal provided to the first half bridge circuit and the second half bridge circuit. The second control signal is generated by modulation of the second low frequency sine wave, and includes a controller whose phase of the second low frequency sine wave is opposite to that of the first low frequency sine wave. A power conversion device characterized by.

Includes a third inductor and a third capacitor
The third inductor is installed between the second half-bridge circuit and the AC power output bus, one end of which is connected to the AC power output bus, and the other end of the third switch and the fourth. Connected to the switch of
The power conversion according to claim 1, wherein the third capacitor is connected to the AC power output bus and the neutral bus at both ends, respectively, to form the third inductor and a filter circuit. Device.

The frequencies of the first low frequency sine wave and the second low frequency sine wave are the same as the frequency of the input AC power input to the power conversion device or the frequency of the output AC power output by the power conversion device. The power conversion device according to claim 1, wherein the power conversion device is characterized by the above.

The first control signal provided by the controller to the first switch and the second switch, and the second control signal provided by the controller to the third switch and the fourth switch are the same. The power conversion device according to claim 1 or 3, wherein each is generated by comparing the second low-frequency sinusoidal wave and the high-frequency triangular wave carrier.

A first differential amplifier, a second differential amplifier, a third differential amplifier, one end connected to the AC power input bus, the other end connected to one end of the first inductor and said above. It is installed between the first current detection element that outputs an input current signal to the controller, the second half-bridge circuit, and the AC power output bus, and one end is connected in series with the AC power output bus. A third inductor whose ends are connected in series between the third switch and the fourth switch, and one end which is connected to one end of the third inductor and the other end of which is the AC power output bus. A second current detection element that is connected to and outputs an output current signal to the controller, one end is connected between the second current detection element and the third inductor, and the other end is the neutral bus. A third inductor that is connected to the third inductor and constitutes a filter circuit, one end of which is connected between the third switch and the fourth switch, and the other end of the third inductor. It includes a third current detecting element connected to the other end and outputting a commutation current signal to the controller.
The first differential amplifier provides a first input terminal connected to the AC power input bus, a second input terminal connected to the neutral bus, and an input voltage signal to the controller. The second differential amplifier includes a third input terminal connected to the AC power output bus, a fourth input terminal connected to the neutral bus, and outputs to the controller. The third differential amplifier includes a second output terminal that provides a voltage signal, and the third differential amplifier has a fifth input terminal connected to the first bus bar and a sixth input terminal connected to the second bus bar. The controller includes an input terminal and a third output terminal that provides a bus bar voltage signal to the controller, wherein the controller is based on the input current signal, the input voltage signal, and the bus bar voltage signal. The second control that adjusts the first control signal to be output to the bridge circuit and outputs it to the second half bridge circuit based on the output current signal, the output voltage signal, and the commutation current signal. The power conversion device according to claim 1, wherein the signal is adjusted.

The first input terminal, the second input terminal, the third input terminal, the fourth input terminal, the fifth input terminal, and the sixth input terminal are The power conversion device according to claim 5, wherein a series connection voltage dividing resistor including at least two resistors is provided.

The power conversion device according to claim 1, further comprising a DC power conversion circuit connected to the first bus bar and the second bus bar.