JPS63100930U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an example of a standby uninterruptible power supply according to this invention, Figure 2 is a connection diagram showing a specific example mainly of the inverter switch circuit, and Figure 3 is the control shown in Figure 2. A block diagram showing a specific example of the device 46, FIG. 4 is a waveform diagram of the operation of each part when receiving commercial power, FIG. 5 is a connection diagram in mode 1 operation during harmonic compensation, and FIG. 6 is a waveform diagram of each part. Figure 7 is a diagram showing the current flow based on inverter switching, Figure 8 is a block diagram showing a conventional floating charge type uninterruptible power supply, and Figure 9 is a diagram showing a conventional standby type uninterruptible power supply. 10 is a block diagram showing a harmonic removal device using a conventional active filter, FIG. 11 is a diagram for explaining its operation, FIG. 12 is a diagram showing the charger 13, and FIG. 13 14 is an explanatory diagram of the operation of the charger, and FIG. 14 is a diagram showing the spectrum of the experimental results of this device.

Claims (1)

[Scope of utility model registration claim] While receiving power from a commercial power source, the commercial power is supplied to the rectifier load, and during a power outage, the commercial power supply line is cut off, the inverter is operated, and the inverter supplies power to the storage battery. A standby uninterruptible power supply device that converts AC power into AC power and supplies it to the load, which is inserted in series between the connection point of the commercial power source and the inverter and the load, and has an impedance larger than the internal impedance of the commercial power source. an inductor, a current detection means for detecting a current flowing through the commercial power supply line, a synchronous sine wave generator driven by the commercial power supply voltage and generating a sine wave current synchronized with the same, and a synchronous sine wave generator for generating a sine wave current in synchronization with the commercial power supply voltage. An instantaneous comparator detects the instantaneous difference between the sine wave current from the generator and the current detected by the current detection means, and the output of the instantaneous comparator controls the inverter so that this becomes zero, and the commercial power supply is a control means for suppressing harmonic components of the current flowing through the inverter; a capacitor voltage detector for detecting the voltage of the DC input capacitor of the inverter; a charge/discharge current detector for detecting the charge/discharge current for the storage battery; A standby uninterruptible power supply device comprising a control means for controlling the amplitude of the sine wave current based on the voltage of the input capacitor and the detected charging/discharging current to operate the inverter as a charger to charge the storage battery. .