JPS62262623A - Non-interruption source system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrially applicable, the present invention is uninterrupted! ! The present invention relates to a power supply system, and more specifically, to an uninterruptible power supply system that supplies power to loads such as OA equipment.

In the conventional technology, C-point commercial AC 1 is input as a source, and the DC converter converts it to DC to charge the storage battery and converts this DC to DC.
- A conventional example of an uninterruptible m-source system in which power is converted to alternating current by an AO inverter and supplied to a load such as OA equipment, and then power is supplied from the storage battery to the load when the commercial Mc power source is cut off has a configuration as shown in Fig. 3. are widely known. In other words, in Fig. 3, 1 is a commercial AC %: an AC-DC converter that converts AC received from a power source into DC.The obtained DC is used to charge a storage battery 2 and is converted to AC by a DC-AC inverter 5. The storage battery 2 is planted so that power is supplied to the load 4 via the DC-AC inverter 3 when the commercial AC source is cut off.

In such a conventional uninterruptible power supply system, the load 4 is
For equipment A, a capacitor input type input power supply circuit that directly rectifies alternating current as shown in FIG. 4 is used. That is, in FIG. 14, the received AC input voltage is rectified by a diode bridge 53 through a parallel circuit of a current limiting resistor 51 and a contact 52, smoothed by a capacitor 55, and the resulting DC voltage is applied to one of the transformers 57. The voltage is applied to the series circuit of the next winding and the transistor 56 for high frequency switching, and from the secondary winding of the transformer 57 to the DC constant voltage circuit 6.
Different DC output voltages of vIIF, 1 for the number of mosquitoes are obtained through 0.61.62. The decimal number thus obtained is 7!11
The heavenly DC output voltage is, for example, +5V, +12Vl.
-12V, etc., and is used as a DC power source for driving loads 4 such as OA equipment. Furthermore, a relay 54 is connected to this input power supply circuit in parallel with the capacitor 55, and when the voltage between the terminals of the capacitor 55 reaches the drive voltage of the relay 54, the contact 52 is closed to short-circuit the current-limiting resistor 51, and the contact 59 is closed. When closed, the drive circuit 58 of the transistor 56 is supplied with a driving DC Tli source. However, in a source circuit with such a capacitor input type input, the power factor is low, so the inrush current that flows into the capacitor 55 at the time of starting the OA equipment flows chaotically with a high peak value, and the power consumption of the OA equipment is reduced. There is a drawback that the current capacity of the AC-Do converter 1 and the DC-AC inverter 3 must be increased.

Purpose of the Invention The present invention solves the above-mentioned drawbacks, and provides a power supply between a load such as an OA equipment having a capacitor input type input power supply circuit and a load such as an OA equipment having no capacitor input type input power supply circuit. ! By separating the systems, uninterrupted TMM
The purpose is to prevent the system capacity from becoming larger than necessary.

Structure of the Invention The uninterruptible power supply system of the present invention converts AC received from a commercial AC power source into DC using an AC-DC humperter and converts it into a capacitor input type input! ! TIL connection is used to supply power to loads such as 0Al14 units that have power supply circuits, and DC power is used for loads such as office automation equipment that do not have capacitor input type input power supply circuits.
- It is configured to convert into alternating current using an AC inverter and supply power.

vI: Examples This will be explained below using examples. Figure 1 is a block diagram of the uninterruptible power supply system of the present invention, and is the same as Figure 3! The same reference numerals are given to those having the li function. In Figure 1,
Loads such as OA equipment are separated into a load 41 having a capacitor input type input power supply circuit (hereinafter referred to as the first load) and a load 42 having no capacitor input type input power supply circuit (hereinafter referred to as the second load). , to the first load 41, the direct current from the Muc-Dc converter 1 is directly supplied to KJ1!
and for the second load 42, the DC-AO
The inverter 3 converts it into alternating current and supplies power. Furthermore, in the system of FIG. 1, the Act-D
iE1 in parallel with CC inverter! A charging circuit 7 is provided to charge the battery 2, so that the battery 2 is always on standby in a properly charged state, and when the DC voltage from the 50-Do Humbater 1 drops, power can be supplied from the battery 2 without momentary interruption. A switch 8 is provided.

With the above configuration, direct current is directly supplied to the first load 41 instead of alternating current, so AC-
The current flowing into the load 41 from the DCC inverter does not have a high peak value, and can be made small enough to correspond to the power consumption of the load 41 in a steady state.

Next, another embodiment of the present invention will be described with reference to the block diagram of FIG. In Figure 2, the charging circuit 7 is omitted, and the charging circuit 7 is shared by the AO-I) O Fun Park 1, and the switch 8 is omitted, making it the AO-) system. It is the same as the system shown in Figure 1, but it can be made into a simpler system.

Effects of the Invention As described in detail in Example 5A, the present invention 1: [The power outage system supplies direct current instead of alternating current to a load having a capacitor input type input source circuit, so
The current flowing into this load from the AC-DC humpter can be made small enough to correspond to the steady state power consumption of the load, so there is no need to make the current capacity of the AC-DC converter unnecessarily large. For loads that do not have a capacitor input type input power supply circuit, alternating current is supplied via the DC-AC inverter, so there is no sudden current flowing through the DC-AC inverter, and the DC-5C The current capacity of the inverter also does not have to be made larger than necessary.

Furthermore, the conversion efficiency of the entire system can be increased, and the reliability of the system can be improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an uninterruptible power supply system of the present invention, Fig. 2 is a block diagram of an uninterruptible MS system of another embodiment of the invention, and Fig. 83 is a block diagram of a conventional uninterruptible power supply system. T? I! FIG. 4 is a circuit diagram of a capacitor input type input lt source circuit used for loads such as OA equipment. 1...Mu0-Do converter 2...Storage battery 3
...DC-AO inverter 4...Load 41.
...Load with capacitor input type input circuit (first
load) 42...Load that does not have a capacitor input type input power supply circuit (second load)

Claims (1)

[Claims] In an uninterruptible power supply system that charges a storage battery with DC obtained by rectifying AC received from a commercial AC power supply and converts it to AC using a DC-AC inverter to supply power to a load, the load is of a capacitor input type. A first load having an input power supply circuit with a capacitor input source and a second load having no input power supply circuit with a capacitor input source are separated, and for the first load, AC received from a commercial AC power source is rectified. DC-A power is directly supplied to the second load.
An uninterruptible power supply system characterized by converting to AC power using a C inverter and supplying power.