JPH0451089U

JPH0451089U -

Info

Publication number: JPH0451089U
Application number: JP9367990U
Authority: JP
Priority date: 1990-09-06
Filing date: 1990-09-06
Publication date: 1992-04-30

Description

【図面の簡単な説明】第１図は本本考案の一実施例を示す回路図、第
２図は第１図を説明するためのタイムチヤート、
第３図は本考案の他の実施例を示す回路図、第４
図は従来例の一例を示す回路図である。１……交流電源、２……しや断器、３……入力
変圧器、４……変流器、５ａ……整流器、６ａ〜
６ｃ……スイツチ、７ａ〜７ｃ……直流リアクト
ル、８ａ〜８ｃ……直流フイルタコンデンサ、９
ａ〜９ｃ……インバータ、１０ａ〜１０ｃ……出
力変圧器、１１ａ〜１１ｃ……負荷、１２ａ〜１
２ｃ……絶縁増幅器、１３，１６，３１，１８，
１６ａ，１８ａ……ボリユーム、１４，１５，１
９，２０，２１，２３，２４，２５，３２，３３
，３４，３５……抵抗、１７，２２，３６……コ
ンデンサ、３０……整流回路、２６〜２９……Ｆ
ＥＴ、３７，３８，３７ａ……演算増幅器、３９
……切換スイツチ、４０……位相器、４１，４１
ａ……ダイオード、４２……スイツチ。[Brief Description of the Drawings] Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a time chart for explaining Fig. 1,
FIG. 3 is a circuit diagram showing another embodiment of the present invention;
The figure is a circuit diagram showing an example of a conventional example. 1... AC power supply, 2... Line breaker, 3... Input transformer, 4... Current transformer, 5a... Rectifier, 6a~
6c...Switch, 7a-7c...DC reactor, 8a-8c...DC filter capacitor, 9
a~9c...Inverter, 10a~10c...Output transformer, 11a~11c...Load, 12a~1
2c...isolated amplifier, 13, 16, 31, 18,
16a, 18a... Volume, 14, 15, 1
9, 20, 21, 23, 24, 25, 32, 33
, 34, 35... Resistor, 17, 22, 36... Capacitor, 30... Rectifier circuit, 26-29... F
ET, 37, 38, 37a... operational amplifier, 39
...Selector switch, 40...Phase shifter, 41, 41
a...Diode, 42...Switch.

Claims

[Claims for Utility Model Registration] (1) A rectifier that converts AC power into DC power, and converts DC power into AC power through at least two or more sets of switches that can be separated in the DC circuit section of the output of the rectifier. In an inverter system having at least two or more sets of inverters to be converted, the DC output voltage of the rectifier is detected correspondingly for each of the at least two or more sets of inverters, and selected by a switch to convert the DC output voltage to the reference voltage and the input feedback of the inverter. a first operational amplifier that amplifies a voltage error; a second operational amplifier that amplifies an error between the output of the first operational amplifier and a reference voltage; and a switching means for switching an input gain resistor provided on the input side of the second operational amplifier, and the switching means turns on and off the input gain resistor in response to individual operation or collective operation of the inverter. A voltage control circuit characterized by comprising: (2) A rectifier that converts AC power into DC power, and at least two or more sets of switches that convert DC power into AC power via at least two or more sets of switches that can be separated in the DC circuit section of the output of the rectifier. In an inverter system having an inverter, the DC output voltage of the rectifier is detected correspondingly to at least two or more sets of inverters, and selected by a switch to amplify the error between the reference voltage and the input feedback voltage of the inverter. a second operational amplifier that amplifies the error between the output of the first operational amplifier and the reference voltage; and a second operational amplifier that amplifies the error between the reference voltage and the input feedback voltage of the inverter and amplifies the error between the output of the first operational amplifier and the input feedback voltage of the inverter. a third operational amplifier input to the second operational amplifier; and a switching means for detecting the input current of the rectifier and switching input gain resistors provided on the input sides of the first and second operational amplifiers. A voltage control circuit characterized in that the switching means is configured to turn on and off the input gain resistor in response to individual operation or collective operation of the inverter.