JP2712787B2 - Inverter DC input current detection method and detection circuit - Google Patents
Inverter DC input current detection method and detection circuitInfo
- Publication number
- JP2712787B2 JP2712787B2 JP2220322A JP22032290A JP2712787B2 JP 2712787 B2 JP2712787 B2 JP 2712787B2 JP 2220322 A JP2220322 A JP 2220322A JP 22032290 A JP22032290 A JP 22032290A JP 2712787 B2 JP2712787 B2 JP 2712787B2
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- inverter
- input
- circuit
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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。Description: TECHNICAL FIELD The present invention relates to a method and a circuit for detecting an inverter DC input current.
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
流入力電圧を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 is detected as a voltage-like signal that is insulated from the DC input voltage of the inverter that shares the DC input voltage of the switching power supply circuit. In this case, the inverter DC input current is applied to a series connection circuit of the primary winding of the signal isolation transformer and the switching transistor, and a voltage drop generated at both ends of a shunt or a resistor provided on the current path. In order to obtain a required voltage-like current detection signal by rectifying the output voltage of the secondary winding of the transformer obtained when the switching transistor is intermittently driven, a conventional detection method and detection circuit of this kind are widely used. In other words, the intermittent driving of the switching transistor is independently performed by a separate control circuit independent of the switching power supply circuit. Those carried out by ring command signal are known.
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 the DC transformation operation by intermittent control of the input DC voltage via a transformer, similarly to the switching power supply circuit, and the DC input current There is no special restriction on the function in making the switching frequency for the switching element the same and sharing the switching command signal in each of 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 as described above, the switching command signal is generated by a separate control circuit independently of the switching power supply circuit. In view of the above, an object of the present invention is to provide a method for detecting an inverter DC input current, which enables the simplification and cost reduction of a circuit by sharing a switching command signal between the two circuits, and a detection circuit according to the detection method. It is.
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し接続し、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。In order to achieve the above object, a method of detecting an inverter DC input current according to the present invention converts and outputs a required AC with a DC intermediate voltage obtained by rectifying an AC input by a rectifier circuit, and converts the DC control voltage thereof. A method for detecting a DC input current of an inverter, which is obtained from a switching power supply circuit that receives the DC intermediate voltage as an input and outputs a DC voltage that is insulated from the voltage, wherein an output of a shunt inserted into a DC input bus of the inverter is provided. Transforms signal voltage into one of the current signal isolation transformers.
The switching voltage is applied to a series connection circuit of a secondary winding and a switching transistor, and the transistor is intermittently driven by sharing a switching signal for DC voltage transformation in the switching power supply circuit. One of the positive and negative bipolar output terminals of the DC voltage obtained by rectifying the DC voltage is connected to the negative control bus of the inverter control voltage forming the reference potential bus, and the DC intermediate voltage and the potential from the other of the positive and negative bipolar output terminals. A required current detection signal which is insulated and has the same reference potential as the inverter control voltage is obtained. Further, according to the above detection method, the inverter DC input current detection circuit of the present invention is inserted into the DC input bus of the inverter. Shunt, a series connection circuit of a primary winding of a current signal isolation transformer and a switching transistor, and the transformer A rectifier and a smoothing capacitor for rectifying and smoothing the output voltage of the secondary winding, a voltage amplifier having a high input impedance are provided, and one of the output terminals of the shunt is connected to the input terminal of the amplifier. And connecting the series connection circuit between the output terminal of the amplifier and the other one of the output terminals of the shunt, and further comprising one of the positive and negative electrodes of the rectified voltage of the secondary winding output of the transformer. An output terminal is connected to a negative bus of the inverter control voltage forming a reference potential bus, and the switching transistor is intermittently driven by sharing a switching signal for DC voltage transformation in the switching power supply circuit. The rectified voltage obtained from the other one is used as a required current detection signal, and further as a switching signal for a transistor forming the series connection circuit, Instead of sharing the serial such as switching power circuit switching signal itself,
In the power supply circuit, another winding of the transformer is provided on the same core of a transformer having a primary winding connected in series with a switching element intermittently driven by the switching signal and sharing the DC intermediate voltage. The output voltage of the auxiliary winding that is electrically insulated from the auxiliary winding is 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。When a DC voltage is applied to a series connection circuit of a primary winding of a transformer and a switching element, and the switching element is turned on and off, the applied voltage of the primary winding of the transformer becomes a maximum value and a zero value of the DC input voltage. An AC voltage corresponding to the primary-to-secondary winding ratio is generated in the secondary line due to a change in magnetic flux in the iron core. Therefore, a required DC voltage can be obtained by rectifying and smoothing the AC output voltage, and DC transformation in which the primary and secondary voltages are electrically insulated can be performed.
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 a DC voltage as described above to obtain a required inverter control DC voltage, and the inverter DC input current detection circuit detects the DC input current of the inverter. The DC voltage is converted as described above using the voltage drop created across the shunt or the resistor as a DC input voltage to obtain a 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, the intermittent frequency of the switching element of the detection circuit is made the same as that of the switching power supply circuit by appropriate selection of the cross-sectional area of the iron core of the transformer and the number of primary and secondary windings in the DC input current detection circuit. The switching command signal of the circuit can be shared. Further, as the switching command signal, any of 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 that changes its 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。According to the present invention, the switching command signal in the DC input current detection circuit is shared with that of the switching power supply circuit, thereby omitting the switching command signal generation circuit in the detection circuit.
以下本発明の実施例を図面により説明する。 Hereinafter, embodiments of the present invention will be described 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 the switching power supply circuit and the inverter DC input current detection circuit in FIG.
第１図において、１はダイオードD1〜D6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Tr1〜Tr6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−Ｗ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はインバー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Ss2を受け前記インバ
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Nc1として出力するものである。In Figure 1, 1 consists of diodes D 1 to D 6 R-
A rectifier circuit for inputting and rectifying the three-phase AC of each of the ST phases, and Cf is a smoothing capacitor for smoothing the output voltage of the rectifier circuit. 2 is an inverter circuit consists of a switching transistor Tr 1 to Tr 6, which the voltage across the smoothing capacitor Cf input via a DC positive bus P and Domakekyoku bus N as the DC link voltage U- It converts the required three-phase alternating current consisting of VW phases. A switching power supply circuit 3 receives the DC intermediate voltage as an input and transforms and outputs a DC control voltage used in a control circuit 5 for the inverter circuit 2. Rs is a resistor having a low resistance value, and is inserted on the input-side negative bus N of the inverter circuit 2 to generate a voltage drop at both ends thereof in proportion to the DC input current of the inverter circuit.
4 is an inverter DC input current detection circuit,
Ones Rs DC voltage signal proportional to the DC input current of the inverter circuit 2 to the voltage drop across the input receives the switching control signal Ss 2 from the switching power supply circuit 3 to output the positive Sd, a negative electrode as Nc 1 It is.
次に第２図において、T1は変圧器であり１次巻線W11
と２次巻線W12と中間タップを有する３次巻線W131とW
132とを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Tr10はスイッチングトランジス
タであり前記変圧器T1の１次巻線W11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，前記直流中間電圧を印加している。ま
た、C10,C11C12は平滑コンデンサ、D10,D11,D12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Tr10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W12,W131,W
132には前記信号Ss1と同一周波数にて変化し且つ該各巻
線の前記巻線W11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Pc1-Nc1,Pc2-Nc2
を図示の如く得ることができる。Next, in FIG. 2, T 1 is a transformer and the primary winding W 11
When the tertiary winding W 131 and W having a secondary winding W 12 and the intermediate tap
132, and the black circles indicate the polarity of each winding. The Tr 10 is connected to the primary winding W 11 in series with the switching transistors a and the transformer T 1, the voltage across the smoothing capacitor Cf relative to the series connection or, by applying the DC intermediate voltage I have. C 10 , C 11 C 12 are smoothing capacitors, and D 10 , D 11 , D 12 are diodes. Now, if by changing the DC voltage intermittently driving the transistor Tr 10 by the switching control signal Ss 1 applied to the primary winding, the windings W 12, W 131, W
132 AC voltage proportional to the winding ratio with respect to the winding W 11 altered and respective windings at the signal Ss 1 the same frequency is induced in the respective induced voltages of the respective smoothing capacitors and diodes DC voltage Pc 1 -Nc 1 , Pc 2 -Nc 2 which is insulated from the DC intermediate voltage by rectifying and smoothing by combination
Can be obtained as shown.
すなわち前記各要素T1,Tr10,C10〜C12,D10〜D12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, the respective components T 1 , Tr 10 , C 10 to C 12 , and D 10 to D 12 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W21と２次巻線W22とを有するものである。
またTr11はスイッチングトランジスタであり前記変圧器
T2の１次巻線W21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Pc2-Nc2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Tr11のベー
スには前記変圧器T1の３次巻線W132の出力電圧が印加さ
れている。またC13は平滑コンデンサ、D13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Ss1により動作を開始すれば、前記変圧
器T1の３次巻線W132には前記信号Ss1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Ss2をそのスイッチング指令信号とする前記トラン
ジスタTr11の断続により前記変圧器T2の１次巻線W21の
印加電圧は変化し該電圧器の２次巻線W22にはW22／W21
の巻線比に比例し前記信号Ss1と同一周波数にて変化す
る交流電圧が発生する。従って該巻線W22出力電圧を整
流・平滑して得た直流電圧Sd-Nc1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Nc1を前記ス
イッチング電源回路の２次直流出力電圧Pc1-Nc1の負極
側Nc1と共通接続することにより前記直流電圧Sd-Nc
1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-Nc1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。Furthermore, in FIG. 2, T 2 is one having a a transformer for current signal isolation primary winding W 21 and the secondary winding W 22.
Tr 11 is a switching transistor and the transformer
T is connected to the primary winding W 21 series of 2, with respect to the series connection, the DC voltage Pc 2 operates in -Nc 2 high input impedance voltage increase width circuit AMP by Zohaba been the resistor Rs of applying a voltage drop across, and is further output voltage is applied third coils W 132 of the base the transformer T 1 of the said transistor Tr 11. The C 13 is a smoothing capacitor, D 13 is a diode. Now, if the switching power supply circuit 3 by starting the operation by the switching control signal Ss 1, wherein the tertiary winding W 132 of the transformer T 1 AC voltage that changes by the signal Ss 1 the same frequency generator and, second of the applied voltage of the primary winding W 21 of the transformer T 2 by intermittent transistor Tr 11 changes the voltage unit to the base signal Ss 2 obtained from the AC voltage and the switching control signal the winding W 22 W 22 / W 21
AC voltage is generated that is proportional to the turns ratio change in the signal Ss 1 the same frequency. Thus DC voltage Sd-Nc 1 the windings W 22 output voltage obtained by rectifying and smoothing the becomes proportional to the DC input current of the voltage drop across thus also the inverter of the resistor Rs. Also the DC voltage Sd-Nc by commonly connecting the negative side Nc 1 of the DC voltage and the negative electrode side Nc 1 secondary DC output voltage Pc 1 -Nc 1 of the switching power supply circuit
1 is a DC input current detection signal of the inverter which is insulated from the DC intermediate voltage of the inverter and has the same reference potential as the voltages Pc 1 -Nc 1 .
すなわち前記各素子T2,Tr11,AMP,C13,D13,Rs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, the elements T 2 , Tr 11 , AMP, C 13 , D 13 , and Rs constitute the inverter DC input current detection circuit 4.
尚、上記動作状態に従って、前記トランジスタTr11の
スイッチング指令信号Ss2に代えて前記トランジスタTr
10に対するスイッチング指令信号Ss1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 operating state, the place of the switching control signal Ss 2 of the transistor Tr 11 transistor Tr
Used appropriately Zohaba the switching control signal Ss 1 for 10 it, even the use of shunt is also possible, such as meter instead 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、入出力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, the 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 by an input signal intermittent method that obtains the detection signal by a voltage signal in a potential insulation state between input and output. In this case, the switching signal for intermittent input signal is shared with the switching signal in the switching power supply circuit, so that the switching signal generation circuit in the DC input current detection circuit of the inverter can be omitted, thereby simplifying the DC input current detection circuit. And cost reduction can be achieved.
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。 １……整流回路、２……インバータ回路、３……スイッ
チング電源回路、４……インバータ直流入力電流検出回
路、５……制御回路、AMP……高入力インピーダンス電
圧増巾器、Cf,C10〜C13……平滑コンデンサ、D1〜D6,D
10〜D13……ダイオード、Rs……抵抗、Tr1,T2……変圧
器、Tr1〜Tr6,Tr10,Tr11……スイッチングトランジス
タ。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. DESCRIPTION OF SYMBOLS 1 ... Rectifier circuit, 2 ... Inverter circuit, 3 ... Switching power supply circuit, 4 ... Inverter DC input current detection circuit, 5 ... Control circuit, AMP ... High input impedance voltage amplifier, Cf, C 10 ~ C 13 ...... Smoothing capacitor, D 1 ~ D 6 , D
10 ~D 13 ...... diode, Rs ...... resistance, Tr 1, T 2 ...... transformer, Tr 1 ~Tr 6, Tr 10 , Tr 11 ...... switching transistor.
Claims (3)
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。1. A DC intermediate voltage obtained by rectifying an AC input by a rectifier circuit is used as an input to convert and output a required AC, and a DC control voltage of the DC intermediate voltage is insulated from the DC intermediate voltage as an input. A method for detecting a DC input current of an inverter obtained from a switching power supply circuit that outputs a DC voltage, comprising: connecting an output signal voltage of a shunt inserted into a DC input bus of the inverter to a primary winding of a current signal insulating transformer. It is applied to a series connection circuit with 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 rectifies the secondary winding output voltage of the transformer. One of the positive and negative output terminals of the obtained DC voltage is connected to the negative control bus of the inverter control voltage serving as a reference potential bus, and Detection method of an inverter DC input current, characterized in that to obtain the required current detection signals having the same reference potential and the DC intermediate voltage and the potential insulated and the inverter control voltage than the other one of the output terminals.
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。2. A DC intermediate voltage obtained by rectifying an AC input by a rectifier circuit is used as an input to convert and output a required AC, and the DC control voltage is insulated from the DC intermediate voltage by inputting the DC intermediate voltage. A DC input current detection circuit for an inverter obtained from a switching power supply circuit that outputs a DC voltage, comprising: a shunt inserted into a DC input bus of the inverter; a primary winding and a switching transistor of a current signal isolation transformer. And a rectifier for smoothing and rectifying the output voltage of the secondary winding of the transformer, a smoothing capacitor, and a voltage amplifier having a high input impedance, and then one of the output terminals of the shunt. Is connected to the input terminal of the amplifier, the series connection circuit is connected between the output terminal of the amplifier and the other one of the output terminals of the shunt, and the secondary winding of the transformer is further connected. Out One of the positive and negative output terminals of the rectified voltage is connected to a negative bus of the inverter control voltage serving as a reference potential bus, and the switching transistor is intermittently shared with a switching signal for DC voltage transformation in the switching power supply circuit. An inverter DC input current detection circuit, which is driven to generate a required current detection signal using the rectified voltage obtained from the other of the positive and negative bipolar output terminals.
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。3. The inverter DC input current detection circuit according to claim 2, wherein the switching signal for the transistor forming the series connection circuit is replaced with the switching signal for the switching power supply circuit itself, instead of the switching signal for the switching power supply circuit itself. The circuit is provided on the same iron core of a transformer having a primary winding which is connected in series with a switching element intermittently driven by the switching signal and shares the DC intermediate voltage, and is electrically connected to other windings of the transformer. An inverter DC input current detection circuit, wherein an output voltage of an auxiliary winding that is electrically insulated is used.
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 JPH04105566A (en) | 1992-04-07 |
| JP2712787B2 true 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 |
|---|---|
| JPH04105566A (en) | 1992-04-07 |
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