JPH04105566A - Method and circuit for detecting inverter dc input current - Google Patents
Method and circuit for detecting inverter dc input currentInfo
- Publication number
- JPH04105566A JPH04105566A JP2220322A JP22032290A JPH04105566A JP H04105566 A JPH04105566 A JP H04105566A JP 2220322 A JP2220322 A JP 2220322A JP 22032290 A JP22032290 A JP 22032290A JP H04105566 A JPH04105566 A JP H04105566A
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- circuit
- inverter
- switching
- input
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Links
- 238000000034 method Methods 0.000 title claims description 6
- 238000004804 winding Methods 0.000 claims abstract description 47
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000009499 grossing Methods 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
- Power Conversion In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はインバータ直流入力電流の検出方法及び検出回
路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inverter DC input current detection method and detection circuit.
スイッチング電源回路の出力電圧をその直流制御電圧と
なしその直流入力電圧を該スイッチング電源回路の直流
入力電圧と共用となすインバータの直流入力電流を該直
流入力電圧と電位絶縁された電圧状信号として検出する
場合、信号絶縁用変圧器の１次巻線とスイッチングトラ
ンジスタとの直列接続回路に対し前記インバータ直流入
力電流がその通電経路上に設けられた分流器又は抵抗の
両端に作る電圧降下を印加し、前記スイッチングトラン
ジスタの断続駆動時に得られる前記変圧器の２次巻線出
力電圧を整流して所要の電圧状電流検出信号を得るもの
が多用されるが、従来のこの種の検出方法及び検出回路
としては、前記スイッチングトランジスタの断続駆動を
前記スイッチング電源回路とは無関係に別置制御回路に
よる独自のスイッチング指令信号により行うものが知ら
れている。The output voltage of the switching power supply circuit is used as its DC control voltage, and the DC input voltage of the inverter is shared with the DC input voltage of the switching power supply circuit.The DC input current of the inverter is detected as a voltage signal electrically isolated from the DC input voltage. In this case, a voltage drop created by the inverter DC input current across a shunt or resistor provided on the current carrying path is applied to the series connection circuit of the primary winding of the signal isolation transformer and the switching transistor. , it is often used to obtain a required voltage-like current detection signal by rectifying the secondary winding output voltage of the transformer obtained when the switching transistor is driven intermittently, but conventional detection methods and detection circuits of this type are A known example is one in which the switching transistor is driven intermittently by a unique switching command signal from a separate control circuit, independent of the switching power supply circuit.
上記の如きインバータ直流入力電流の検出動作は、前記
スイッチング電源回路におけるものと同様に、変圧器を
介した入力直流電圧の断続制御による直流変圧動作を基
本とするものであり、前記の直流入力電流検出動作とス
イッチング電源回路における制御電圧変圧動作それぞれ
においてスイッチング素子に対するスイッチング周波数
を同一となしスイッチング指令信号を共用させることに
関して機能上特別な制約は無い。The detection operation of the inverter DC input current as described above is based on DC transformation operation by intermittent control of the input DC voltage via a transformer, similar to that in the switching power supply circuit. There are no special functional restrictions on making the switching frequencies for the switching elements the same and sharing the switching command signal in both the detection operation and the control voltage transformation operation in the switching power supply circuit.
しかしながら前記の如き従来のインバータ直流入力電流
の検出方法及び該検出方法に従う検出回路においては、
そのスイッチング指令信号を前記スイッチング電源回路
とは無関係に別置制御回路にて作るものである。これに
鑑み本発明は前記両回路におけるスイッチング指令信号
の共用を図り回路の簡略化と低廉化を可能とするインバ
ータ直流入力電流の検出方法と該検出方法に従う検出回
路との提供を目的とするものである。However, in the conventional inverter DC input current detection method and the detection circuit according to the detection method,
The switching command signal is generated by a separate control circuit independently of the switching power supply circuit. In view of this, it is an object of the present invention to provide a method for detecting an inverter DC input current, which allows the switching command signals to be shared in both circuits, thereby simplifying the circuit and reducing the cost thereof, and a detection circuit according to the detection method. It is.
ｃｍａを解決するための手段〕
上記目的を達成するために、本発明のインバータ直流入
力電流の検出方法は、整流回路により交流入力を整流し
て得た直流中間電圧を入力として所要の交流を変換出力
し且つその直流制御電圧を、前記直流中間電圧を入力と
し該電圧と電位絶縁された直流電圧を出力するスイッチ
ング電源回路より得るインバータの直流入力電流の検出
方法であって、前記インバータの直流入力母線に挿入し
た分流器の出力信号電圧を電流信号絶縁用変圧器の１次
巻線とスイッチングトランジスタとの直列接続回路に印
加すると共に該トランジスタを前記スイッチング電源回
路における直流電圧変圧用のスイッチング信号を共用と
なして断続駆動し、更に前記変圧器の２次巻線出力電圧
を整流して得た直流電圧の正負両極出力端子の何れが一
方を基準電位母線となす前記インバータ制御電圧の負極
母線に接続し、前記正負両極出力端子の他の一方より前
記直流中間電圧と電位絶縁され且つ前記インバータ制御
電圧と同一の基準電位を有する所要の電流検出信号を得
るものとなし、更に上記検出方法に従って本発明のイン
バータ直流入力電流の検出回路は、前記インバータの直
流入力母線に挿入した分流器と、電流信号絶縁用変圧器
の１次巻線とスイッチングトランジスタとの直列接続回
路と、該変圧器の２次巻線出力電圧の整流・平滑用の整
流器と平滑コンデンサと、高入力インピーダンスの電圧
増巾器とを設け、次に前記分流器の出力端子の一方を前
記増巾器の入力端子に接続すると共に該増巾器の出力端
子と前記分流器出力端子の他の一方との間に前記直列接
続回路を接続し、更に前記変圧器の２次巻線出力整流電
圧の正負極何れか一方の出力端子を基準電位母線となす
前記インバータ制御電圧の負極母線に接続し、且つ前記
スイッチングトランジスタを前記スイッチング電源回路
における直流電圧変圧用のスイッチング信号を共用して
断続駆動し、前記正負両極出力端子の他の一方より得ら
れる前記整流電圧を以って所要の電流検出信号となすも
のとし、更にはまた前記直列接続回路を成すトランジス
タ用のスイッチング信号として、前記の如きスイッチン
グ電源回路用スイッチング信号自体の共用に代えて、該
電源回路においてそのスイッチング信号により断続駆動
されるスイッチング素子と直列接続されて前記直流中間
電圧を分担する１次巻線を有する変圧器の同一鉄心上に
設けられ且つ該変圧器の他の巻線と電気的に絶縁されて
いる補助巻線の出力電圧を用いるものとする。Means for Solving cma] In order to achieve the above object, the inverter DC input current detection method of the present invention converts the required AC by inputting a DC intermediate voltage obtained by rectifying the AC input with a rectifier circuit. A method for detecting a DC input current of an inverter, which outputs the DC control voltage from a switching power supply circuit that receives the DC intermediate voltage as an input and outputs a DC voltage potential-insulated from the DC intermediate voltage, the DC input current of the inverter The output signal voltage of the shunt inserted in the busbar is applied to the series connection circuit of the primary winding of the current signal isolation transformer and the switching transistor, and the transistor is applied to the switching signal for DC voltage transformation in the switching power supply circuit. Which of the positive and negative polarity output terminals of the DC voltage obtained by driving the secondary winding output voltage of the transformer intermittently as a shared terminal is connected to the negative bus of the inverter control voltage, with one of the output terminals serving as the reference potential bus. and obtain a required current detection signal which is electrically insulated from the DC intermediate voltage and has the same reference potential as the inverter control voltage from the other one of the positive and negative bipolar output terminals, and further according to the detection method described above. The inverter DC input current detection circuit of the invention includes a shunt inserted into the DC input bus of the inverter, a series connection circuit of a primary winding of a current signal isolation transformer and a switching transistor, and A rectifier for rectifying and smoothing the output voltage of the next winding, a smoothing capacitor, and a voltage amplifier with high input impedance are provided, and then one of the output terminals of the shunt is connected to the input terminal of the amplifier. and the series connection circuit is connected between the output terminal of the amplifier and the other one of the shunt output terminals, and further the output of either the positive or negative pole of the rectified voltage output from the secondary winding of the transformer is connected. The terminal is connected to the negative bus of the inverter control voltage which serves as a reference potential bus, and the switching transistor is intermittently driven by sharing the switching signal for DC voltage transformation in the switching power supply circuit, and the positive and negative output terminals are connected to the negative bus of the inverter control voltage. The rectified voltage obtained from one of the above shall be used as a necessary current detection signal, and furthermore, the switching signal itself for the switching power supply circuit as described above may be used in common as a switching signal for the transistors forming the series-connected circuit. Instead, in the power supply circuit, the transformer is provided on the same core of the transformer and has a primary winding that is connected in series with a switching element that is intermittently driven by the switching signal and shares the DC intermediate voltage. The output voltage of an auxiliary winding that is electrically isolated from other windings shall be used.
変圧器１次巻線とスイッチング素子との直列接続回路に
直流電圧を印加し、該スイッチング素子を断続すれば、
前記変圧器の１次巻線印加電圧は前記直流入力電圧の最
大値と零値間にて変動し、その鉄心中の磁束変化により
その２次線には１次２次間巻線比に応じた交流電圧が発
生する。従って該交流出力電圧の整流と平滑とにより所
要の直流電圧を得ることができ、１次及び２次両電圧間
が電位絶縁された直流変圧を行うことができる。If a DC voltage is applied to the series connection circuit of the transformer primary winding and the switching element and the switching element is turned on and off,
The voltage applied to the primary winding of the transformer fluctuates between the maximum value and zero value of the DC input voltage, and due to changes in the magnetic flux in the iron core, the voltage applied to the primary winding of the transformer changes depending on the winding ratio between the primary and secondary windings. AC voltage is generated. Therefore, the required DC voltage can be obtained by rectifying and smoothing the AC output voltage, and DC transformation can be performed in which both the primary and secondary voltages are electrically insulated.
一方、前記スイッチング電源回路は前記インバータの直
流中間電圧を前記の如く直流変圧して所要のインバータ
制御用直流電圧を得るものであり、また、前記インバー
タ直流入力電流の検出回路は該直流入力電流の分流器ま
たは抵抗両端に作る電圧降下を直流入力電圧として前記
の如く直流変圧し所要の電圧状電流検出信号を得るもの
である。On the other hand, the switching power supply circuit converts the DC intermediate voltage of the inverter into DC voltage as described above to obtain the required DC voltage for controlling the inverter, and the inverter DC input current detection circuit converts the DC intermediate voltage of the inverter into DC voltage as described above. The voltage drop created across the shunt or resistor is used as the DC input voltage and DC transformed as described above to obtain the required voltage-like current detection signal.
従って、前記直流入力電流検出回路における変圧器の鉄
心断面積とその１次・２次巻線数の適当な選択により該
検出回路スイッチング素子の断続周波数を前記スイッチ
ング電源回路のそれと同一となし該両回路のスイッチン
グ指令信号を共用となすことが可能となる。更には該ス
イッチング指令信号として、前記電源回路における指令
信号そのもの、或いはまた該指令信号に従ってその磁束
変動を行う前記電源回路の変圧器の２次巻線出力電圧の
何れもが適用可能となる。Therefore, by appropriately selecting the core cross-sectional area of the transformer and the number of primary and secondary windings in the DC input current detection circuit, the intermittent frequency of the detection circuit switching element can be made the same as that of the switching power supply circuit. It becomes possible to share the switching command signal of the circuit. Further, as the switching command signal, either the command signal itself in the power supply circuit or the output voltage of the secondary winding of the transformer of the power supply circuit, which fluctuates the magnetic flux according to the command signal, can be applied.
上記に従い本発明は、前記直流入力電流検出回路におけ
るスイッチング指令信号を前記スイッチング電源回路の
それと共用となすことにより該検出回路におけるスイッ
チング指令信号作成回路の省略を図るものである。In accordance with the above, the present invention aims to omit the switching command signal generation circuit in the detection circuit by sharing the switching command signal in the DC input current detection circuit with that in the switching power supply circuit.
以下本発明の実施例を図面により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図はインバータ装置の全体回路図であり、第２図は
第１図におけるスイッチング電源回路とインバータ直流
入力電流検出回路との回路図である。FIG. 1 is an overall circuit diagram of the inverter device, and FIG. 2 is a circuit diagram of a switching power supply circuit and an inverter DC input current detection circuit in FIG. 1.
第１図において、１はダイオードＤ１〜Ｄ、より成りＲ
−Ｓ−Ｔ各相の三相交流を入力としこれを整流する整流
回路、Ｃｆは該整流回路の出力電圧を平滑する平滑コン
デンサである。２はインバータ回路であり、スイッチン
グトランジスタＴｒ、”Ｔｒ、より成り、直流正極母線
Ｐと同負極母線Ｎとを介して入力される前記平滑コンデ
ンサＣｆの両端電圧をその直流中間電圧としてこれをＵ
−Ｖ−各相より成る所要の三相交流に変換するものであ
る。３はスイッチング電源回路であり、前記の直流中間
電圧を入力とし前記インバータ回路２に対する制御回路
５にて使用する直流制御電圧を変圧出力するものである
。Ｒｓは低抵抗値の抵抗であり、前記インバータ回路２
の入力側負極母線Ｎ上に挿入され該インバータ回路の直
流入力電流に比例した電圧降下をその両端に発生させる
ものである。４はインバ−タ直流入力電流検出回路であ
り、前記抵抗Ｒｓの両端電圧降下を入力とし前記スイッ
チング電源回路３よりそのスイッチング指令信号Ｓｓｚ
を受は前記インバータ回路２の直流入力電流に比例した
直流電圧信号をその正極をＳｄ、負極をＮｃ＋とじて出
力するものである。In FIG. 1, 1 consists of diodes D1 to D, R
-S-T A rectifier circuit that inputs three-phase alternating current of each phase and rectifies it, and Cf is a smoothing capacitor that smoothes the output voltage of the rectifier circuit. 2 is an inverter circuit, which is made up of switching transistors Tr, Tr, and converts the voltage across the smoothing capacitor Cf, which is input via the DC positive bus P and the negative bus N, as its DC intermediate voltage, to U.
-V- Conversion into the required three-phase alternating current consisting of each phase. Reference numeral 3 denotes a switching power supply circuit which receives the DC intermediate voltage as input and outputs a transformed DC control voltage to be used in the control circuit 5 for the inverter circuit 2. Rs is a resistor with a low resistance value, and the inverter circuit 2
The inverter circuit is inserted onto the input side negative electrode bus N of the inverter circuit to generate a voltage drop across it in proportion to the DC input current of the inverter circuit. 4 is an inverter DC input current detection circuit, which receives the voltage drop across the resistor Rs as an input and receives the switching command signal Ssz from the switching power supply circuit 3.
The receiver outputs a DC voltage signal proportional to the DC input current of the inverter circuit 2, with its positive pole as Sd and its negative pole as Nc+.
次に第２図において、ＴＩは変圧器であり１次巻線−３
，と２次巻線−１□と中間タップを有する３次巻線−Ｉ
ｌｌとｌ’ｉｔ１ｇとを有するものであり図示・印は該
各巻線の極性を示すものである。またＴｒ、。はスイッ
チングトランジスタであり前記変圧器Ｔ、の１次巻線−
１，と直列に接続されており、該直列接続に対し前記平
滑コンデンサＣｆの両端電圧すなわち。Next, in Figure 2, TI is a transformer and the primary winding -3
, and secondary winding -1 □ and tertiary winding -I with intermediate tap
ll and l'it1g, and the illustrations and marks indicate the polarity of each winding. Also Tr. is a switching transistor and the primary winding of the transformer T -
1, and the voltage across the smoothing capacitor Cf for the series connection.
前記直流中間電圧を印加している。またＣ２゜、Ｃ１゜
ｃ＋ｇは平滑コンデンサ、Ｄ、。＋０１１．ＤＩ！はダ
イオードである。今、スイッチング指令信号Ｓｓ１によ
り前記トランジスタＴｒｅｅを断続駆動して前記１次巻
線に印加される直流電圧を変化させれば、前記各巻線−
１ｔ＋ Ｌ３＋Ｊ＋。には前記信号Ｓｓ、と同一周波数
にて変化し且つ該各巻線の前記巻線−１１に対する巻線
比に比例した交流電圧が誘起され、該各誘起電圧を前記
各平滑コンデンサとダイオードとの組合せにより整流平
滑することにより前記直流中間電圧と電位絶縁された直
流電圧Ｐｃ、−Ｎｃ、、 Ｐｃ。The DC intermediate voltage is applied. Also, C2゜, C1゜c+g are smoothing capacitors, D,. +011. DI! is a diode. Now, if the transistor Tree is intermittently driven by the switching command signal Ss1 to change the DC voltage applied to the primary winding, each of the windings -
1t+ L3+J+. An alternating voltage that changes at the same frequency as the signal Ss and is proportional to the winding ratio of each winding to the winding -11 is induced, and the induced voltage is applied to the combination of the smoothing capacitor and the diode. The DC voltages Pc, -Nc, Pc are electrically isolated from the DC intermediate voltage by rectification and smoothing.
Ｎｃｚを図示の如く得ることができる。Ncz can be obtained as shown.
すなわち前記各要素Ｔ＋＋Ｔｒ＋ｏ＋ Ｃ＋ｏ〜Ｃ＋ｚ
＋Ｄ＋ｏ〜１）＋ｚは前記スイッチング電源回路３を構
成するものである。That is, each of the above elements T++Tr+o+C+o to C+z
+D+o to 1)+z constitute the switching power supply circuit 3.
更に第２図において、Ｔ２は電流信号絶縁用の変圧器で
あり１次巻線１１１に＋と２次巻線−０とを有するもの
である。またＴｒ＋＋はスイッチングトランジスタであ
り前記変圧器’ｈの１次巻線−２１と直列に接続されて
おり、該直列接続に対し、前記直流電圧Ｐｃ、−Ｎｃ、
で動作する高入力インピーダンス電圧増巾器ＡＭＰによ
り増巾された前記抵抗Ｒｓの両端電圧降下を印加し、更
に該トランジスタＴｒ、、のベースには前記変圧器Ｔ、
の３次巻ＩＪＩ Ｗ ＋ ３２の出力電圧が印加されて
いる。またＣ１０は平滑コン、デンサ、ＤＩ３はダイオ
ードである。今、前記スイッチング電源回路３がそのス
イッチング指令信号Ｓｓ＋により動作を開始すれば、前
記変圧器ＴＩの３次巻線−３３２には前記信号Ｓｓ＋と
同一周波数にて変化する交流電圧が発生し、該交流電圧
より得たベース信号Ｓｓｚをそのスイッチング指令信号
とする前記トランジスタＴｒ＋１の断続により前記変圧
器Ｔ２の１次巻、％ｉＷｚ＋の印加電圧は変化し該変圧
器の２次巻線６□にはＷｇｚ／Ｌ＋の巻線比に比例し前
記信号Ｓｓ。Furthermore, in FIG. 2, T2 is a transformer for current signal isolation, and has a primary winding 111 of + and a secondary winding of -0. Further, Tr++ is a switching transistor and is connected in series with the primary winding -21 of the transformer 'h, and the DC voltages Pc, -Nc,
A voltage drop across the resistor Rs amplified by a high input impedance voltage amplifier AMP operating at
The output voltage of the tertiary winding IJI W + 32 is applied. Further, C10 is a smoothing capacitor and a capacitor, and DI3 is a diode. Now, when the switching power supply circuit 3 starts operating in response to the switching command signal Ss+, an alternating current voltage that changes at the same frequency as the signal Ss+ is generated in the tertiary winding -332 of the transformer TI. The voltage applied to the primary winding of the transformer T2, %iWz+, changes due to the on/off of the transistor Tr+1, which uses the base signal Ssz obtained from the AC voltage as its switching command signal, and the voltage applied to the secondary winding 6□ of the transformer changes. The signal Ss is proportional to the winding ratio of Wgz/L+.
と同一周波数にて変化する交流電圧が発生する。An alternating current voltage that changes at the same frequency is generated.
従って該巻線Ｌ□出力電圧を整流・平滑して得た直流電
圧５ｄ−Ｎｃ＋は前記抵抗Ｒｓの両端電圧降下従ってま
た前記インバータの直流入力電流に比例したものとなる
。また該直流電圧の負極側Ｎｃ、を前記スイッチング電
源回路の２次直流出力電圧Ｐｃ、−Ｎｃ。Therefore, the DC voltage 5d-Nc+ obtained by rectifying and smoothing the output voltage of the winding L□ is proportional to the voltage drop across the resistor Rs and is also proportional to the DC input current of the inverter. Further, the negative side Nc of the DC voltage is the secondary DC output voltage Pc, -Nc of the switching power supply circuit.
の負極側Ｎｃ、と共通接続することにより前記直流電圧
５ｄ−ＮＣ＋は、前記インバータの直流中間電圧と電位
絶縁され且つ前記電圧Ｐｃ１−Ｎｃｌと同一基準電位を
有する前記インバータの直流入力電流検出信号となる。The DC voltage 5d-NC+ is electrically insulated from the DC intermediate voltage of the inverter and has the same reference potential as the voltage Pc1-Ncl. Become.
すなわち前記各素子Ｔｚ＋Ｔｒ＋＋＋ＡＭＰ、Ｃ１ｓ＋
Ｄ１３．Ｒ３は前記インバータ直流入力電流検出回路４
を構成するものである。That is, each of the elements Tz+Tr+++AMP, C1s+
D13. R3 is the inverter DC input current detection circuit 4
It constitutes.
尚、上記動作状態に従って、前記トランジスタＴｒ、、
のスイッチング指令信号Ｓｓ、に代えて前記トランジス
タＴｒ、。に対するスイッチング指令信号Ｓｓ、を適当
に増巾して用いることも、更には前記抵抗Ｒｓに代えて
計器用等の分流器の使用もまた可能である。Incidentally, according to the above operating state, the transistors Tr,...
The transistor Tr, in place of the switching command signal Ss. It is also possible to appropriately amplify the switching command signal Ss for the resistor Rs and use a current shunt for measuring instruments or the like in place of the resistor Rs.
本発明によれば、スイッチング電源回路によりその直流
制御電圧が供給されるインバータの直流入力電流の検出
を、入出方間電位絶縁状態の電圧信号にてその検出信号
を得る入力信号断続方式にて行う場合、該入力信号断続
用スイッチング信号を前記スイッチング電源回路におけ
るスイッチング信号と共用となすことにより、前記イン
バータの直流入力電流検出回路におけるスイッチング信
号発生回路の省略が可能となり該直流入力電流検出回路
の簡略化と低廉化とを図ることができる。According to the present invention, detection of the DC input current of the inverter to which the DC control voltage is supplied by the switching power supply circuit is performed using an input signal intermittent method in which the detection signal is obtained using a voltage signal with potential insulation between input and output. In this case, by sharing the input signal intermittent switching signal with the switching signal in the switching power supply circuit, it is possible to omit the switching signal generation circuit in the DC input current detection circuit of the inverter, thereby simplifying the DC input current detection circuit. It is possible to reduce the cost and reduce the cost.
第１図は本発明の実施例を示すインバータ装置の全体回
路図、第２図は第１図におけるスイッチング電源回路と
インバータ直流入力電流検出回路との回路図である。FIG. 1 is an overall circuit diagram of an inverter device showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of a switching power supply circuit and an inverter DC input current detection circuit in FIG. 1.
Claims (1)
圧を入力として所要の交流を変換出力し且つその直流制
御電圧を、前記直流中間電圧を入力とし該電圧と電位絶
縁された直流電圧を出力するスイッチング電源回路より
得るインバータの直流入力電流の検出方法であって、前
記インバータの直流入力母線に挿入した分流器の出力信
号電圧を電流信号絶縁用変圧器の１次巻線とスイッチン
グトランジスタとの直列接続回路に印加すると共に該ト
ランジスタを前記スイッチング電源回路における直流電
圧変圧用のスイッチング信号を共用となして断続駆動し
、更に前記変圧器の２次巻線出力電圧を整流して得た直
流電圧の正負両極出力端子の何れか一方を基準電位母線
となす前記インバータ制御電圧の負極母線に接続し、前
記正負両極出力端子の他の一方より前記直流中間電圧と
電位絶縁され且つ前記インバータ制御電圧と同一の基準
電位を有する所要の電流検出信号を得ることを特徴とす
るインバータ直流入力電流の検出方法。 ２）整流回路により交流入力を整流して得た直流中間電
圧を入力として所要の交流を変換出力し且つその直流制
御電圧を、前記直流中間電圧を入力とし該電圧と電位絶
縁された直流電圧を出力するスイッチング電源回路より
得るインバータの直流入力電流の検出回路であって、前
記インバータの直流入力母線に挿入した分流器と、電流
信号絶縁用変圧器の１次巻線とスイッチングトランジス
タとの直列接続回路と、該変圧器の２次巻線出力電圧の
整流・平滑用の整流器と平滑コンデンサと、高入力イン
ピーダンスの電圧増巾器とを設け、次に前記分流器の出
力端子の一方を前記増巾器の入力端子に接続すると共に
該増巾器の出力端子と前記分流器出力端子の他の一方と
の間に前記直列接続回路を接続し、更に前記変圧器の２
次巻線出力整流電圧の正負極何れか一方の出力端子を基
準電位母線となす前記インバータ制御電圧の負極母線に
接続し、且つ前記スイッチングトランジスタを前記スイ
ッチング電源回路における直流電圧変圧用のスイッチン
グ信号を共用して断続駆動し、前記正負両極出力端子の
他の一方より得られる前記整流電圧を以って所要の電流
検出信号となすことを特徴とするインバータ直流入力電
流の検出回路。 ３）請求項２記載のインバータ直流入力電流の検出回路
において、前記直列接続回路を成すトランジスタ用のス
イッチング信号として、前記の如きスイッチング電源回
路用スイッチング信号自体の共用に代えて、該電源回路
においてそのスイッチング信号により断続駆動されるス
イッチング素子と直列接続されて前記直流中間電圧を分
担する１次巻線を有する変圧器の同一鉄心上に設けられ
且つ該変圧器の他の巻線と電気的に絶縁されている補助
巻線の出力電圧を用いることを特徴とするインバータ直
流入力電流の検出回路。[Scope of Claims] 1) A DC intermediate voltage obtained by rectifying an AC input with a rectifier circuit is used as an input to convert and output the required AC, and the DC control voltage is obtained by inputting the DC intermediate voltage and the voltage and potential. A method for detecting a DC input current of an inverter obtained from a switching power supply circuit that outputs an isolated DC voltage, the output signal voltage of a shunt inserted into the DC input bus of the inverter being detected by the primary of a current signal isolation transformer. A voltage is applied to a series connection circuit of a winding and a switching transistor, and the transistor is intermittently driven by sharing the switching signal for DC voltage transformation in the switching power supply circuit, and further the secondary winding output voltage of the transformer is One of the positive and negative bipolar output terminals of the rectified DC voltage is connected to the negative bus of the inverter control voltage, which serves as a reference potential bus, and the potential is isolated from the DC intermediate voltage from the other of the positive and negative bipolar output terminals. A method for detecting an inverter DC input current, characterized in that a required current detection signal having the same reference potential as the inverter control voltage is obtained. 2) Using the DC intermediate voltage obtained by rectifying the AC input using a rectifier circuit as input, converting and outputting the required AC, and using the DC intermediate voltage as the input, converting the DC voltage into a DC voltage that is electrically insulated from the voltage. A detection circuit for a DC input current of an inverter obtained from an output switching power supply circuit, the circuit comprising a shunt inserted into the DC input bus of the inverter, a primary winding of a current signal isolation transformer, and a switching transistor connected in series. A circuit, a rectifier and a smoothing capacitor for rectifying and smoothing the secondary winding output voltage of the transformer, and a voltage amplifier with high input impedance are provided, and then one of the output terminals of the shunt is connected to the amplifier. the series connection circuit is connected to the input terminal of the amplifier, and the series connection circuit is connected between the output terminal of the amplifier and the other one of the shunt output terminals;
Either the positive or negative output terminal of the rectified voltage output from the next winding is connected to the negative bus of the inverter control voltage, which serves as a reference potential bus, and the switching transistor is connected to a switching signal for DC voltage transformation in the switching power supply circuit. A detection circuit for an inverter DC input current, characterized in that the two terminals are shared and driven intermittently, and the rectified voltage obtained from the other one of the positive and negative output terminals is used as a required current detection signal. 3) In the inverter DC input current detection circuit according to claim 2, instead of sharing the switching signal itself for the switching power supply circuit as described above as the switching signal for the transistors forming the series connection circuit, the switching signal itself is used in the power supply circuit. A transformer having a primary winding connected in series with a switching element driven intermittently by a switching signal to share the DC intermediate voltage, provided on the same core of a transformer and electrically insulated from other windings of the transformer. An inverter DC input current detection circuit characterized by using an output voltage of an auxiliary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2220322A JP2712787B2 (en) | 1990-08-22 | 1990-08-22 | Inverter DC input current detection method and detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2220322A JP2712787B2 (en) | 1990-08-22 | 1990-08-22 | Inverter DC input current detection method and detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04105566A true JPH04105566A (en) | 1992-04-07 |
| JP2712787B2 JP2712787B2 (en) | 1998-02-16 |
Family
ID=16749329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2220322A Expired - Lifetime JP2712787B2 (en) | 1990-08-22 | 1990-08-22 | Inverter DC input current detection method and detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2712787B2 (en) |
-
1990
- 1990-08-22 JP JP2220322A patent/JP2712787B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2712787B2 (en) | 1998-02-16 |
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