JPH042989U

JPH042989U -

Info

Publication number: JPH042989U
Application number: JP4263490U
Authority: JP
Priority date: 1990-04-21
Filing date: 1990-04-21
Publication date: 1992-01-10

Description

[Brief explanation of the drawing]

第１図〜第３図はこの考案の一実施例に係り、
第１図はこの考案の一実施例を示す回路図、第２
図は直流母線電圧検出回路を示す図、第３図は出
力電流検出回路を示す図、第４図は従来のインバ
ータ装置を示す回路図、第５図は停電検出回路を
示す図、第６図は残留磁束検出回路を示す図、第
７図はモータ再始動のタイムチヤートを示す図で
ある。図において、１……電源、２……順変換器、３
……平滑コンデンサ、４……逆変換器、５……モ
ータ、６……ベース駆動用の増幅回路、７……ボ
リユーム、８，９……スイツチ、１０……マイク
ロプロセツサ、１００……停電検出回路、２００
……電圧検出回路、３００……直流母線電圧検出
回路、４００……出力電流検出回路である。なお
、図中、同一符号は同一、又は相当部分を示す。 Figures 1 to 3 relate to an embodiment of this invention,
Figure 1 is a circuit diagram showing an embodiment of this invention, Figure 2 is a circuit diagram showing an embodiment of this invention.
Figure 3 shows a DC bus voltage detection circuit, Figure 3 shows an output current detection circuit, Figure 4 shows a circuit diagram of a conventional inverter, Figure 5 shows a power failure detection circuit, and Figure 6 7 is a diagram showing a residual magnetic flux detection circuit, and FIG. 7 is a diagram showing a time chart for restarting the motor. In the figure, 1...power supply, 2...forward converter, 3
... Smoothing capacitor, 4 ... Inverter, 5 ... Motor, 6 ... Base drive amplifier circuit, 7 ... Volume, 8, 9 ... Switch, 10 ... Microprocessor, 100 ... Power outage detection circuit, 200
. . . voltage detection circuit, 300 . . . DC bus voltage detection circuit, 400 . . . output current detection circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims

[Scope of utility model registration request]

In an inverter device equipped with a forward converter that converts AC power to DC, a smoothing capacitor, and an inverse converter that converts DC to AC, there is a power failure detection circuit that detects the presence or absence of AC power, and a motor failure detection circuit that detects the presence or absence of AC power. A residual magnetic flux detection circuit that detects the line voltage generated by residual magnetic flux and outputs a pulse signal corresponding to the positive or negative of the line voltage, a current detection circuit that detects the output current, and a DC bus voltage detection circuit. a voltage detection circuit; a first calculation means for calculating the rotational speed of the motor based on the output pulse of the residual magnetic flux detection circuit upon power restoration; and a corresponding phase control of the inverter output voltage based on the phase of the output pulse. A gate signal to the inverter is sent to the motor based on the rotation direction of the residual magnetic flux detection circuit, the rotation speed of the first calculation means, and the phase control signal of the second calculation means. The control means for controlling the inverter to output an output having the same output frequency and phase as the terminal voltage of the inverter, the signal of the current detection circuit, and the signal of the voltage detection circuit, An inverter control circuit comprising control means for controlling the output voltage and frequency of the inverter.