JPH0311342U

JPH0311342U -

Info

Publication number: JPH0311342U
Application number: JP7186889U
Authority: JP
Priority date: 1989-06-19
Filing date: 1989-06-19
Publication date: 1991-02-04
Anticipated expiration: 2004-06-19
Also published as: JPH0721073Y2

Description

[Brief explanation of drawings]

第１図はこの考案の実施例を示すブロツク図、
第２図はその停電時における各部動作波形例を示
す図、第３図及び第４図はそれぞれ従来の無停電
電源装置を示すブロツク図、第５図はコンデンサ
入力型整流器負荷にＰＷＭ方式のインバータを用
いた場合の出力波形を示す図である。 Figure 1 is a block diagram showing an embodiment of this invention.
Figure 2 shows an example of the operation waveforms of each part during a power outage, Figures 3 and 4 are block diagrams showing conventional uninterruptible power supplies, and Figure 5 shows a PWM inverter with a capacitor input rectifier load. FIG. 3 is a diagram showing an output waveform when using the .

Claims

[Scope of claim for utility model registration] A power outage detector detects whether AC power is being supplied from a commercial power source or a power outage is occurring, and when AC power is being supplied, the direct power switch is turned on by the output of the power outage detector. AC power is supplied from the commercial power supply to the load through the direct transmission switch, and the charger is activated by the output of the power failure detector, and AC power is supplied through the transformer connected to the load side of the direct transmission switch. During the power outage, the direct feed switch is turned off by the output of the power outage detector and the inverter is activated, and the inverter changes the output of the storage battery to AC power. In the uninterruptible power supply that is converted into electric power and supplied to the load through the transformer, a voltage detector detects the output voltage of the inverter, and the output of the voltage detector is compared with a first reference voltage. a first comparator; a gate for taking out the output of the first comparator after a predetermined time after the power failure detector detects a power outage; and a voltage higher than the first reference voltage in the output of the gate. compares the output voltage of the storage battery with a second reference voltage, and outputs an output that resets the flip-flop when the second reference voltage is greater. An uninterruptible power supply device comprising: a second comparator that outputs a second comparator;