JPS63217931A - Non-interrupting electric source - 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] [Summary] One of the plurality of output circuits of the DC-DC converter connected to the rectifier circuit is used as a backup power supply charging circuit,
In the event of a power outage, this backup power supply charging circuit is disabled and the DC output from the bank amplifier power supply is switched.
- Discloses an uninterruptible power source device in which alternating current is supplied to other output circuits via a transformer of a DC converter.

[Industrial application field]

The present invention relates to an uninterruptible power supply, and more particularly to an uninterruptible power supply using a DC-DC converter connected to a rectifier circuit.

Power supplies for communication equipment, etc. require multiple DC voltages, so after rectifying the commercial power supply, a DC-DC converter can be used to generate various DC voltages. It is necessary to lecture on

(Prior art) Fig. 6 shows a conventional uninterruptible power supply a device, which normally generates DC voltage from a 100V commercial power supply through a rectifier circuit 20 and charges a backup power supply a (battery) 21. At the same time, a required DC voltage (for example, 5V) is generated and supplied to the load via the DC-DC converter 22.

In the event of a power outage, DC voltage is supplied from the backup power supply 111121 to the converter 22, and the converter 22 is also configured to generate a required DC load voltage.

[Problem that the invention seeks to solve]

In the above conventional example, the rectifier circuit 20 uses a transformer (not shown) to step down the commercial power supply and then rectifies it to generate a backup power supply voltage (for example, 48V), or the rectified voltage is converted to a duty ratio. Since the necessary backup power supply voltage is obtained by a control circuit (not shown), there are problems in that the scale of the circuit becomes large or complicated control is required.

Therefore, an object of the present invention is to realize an uninterruptible power supply device that can handle normal times and power outages with a simple circuit.

[Means for solving problems]

FIG. 1 shows a conceptual diagram of an uninterruptible power supply according to the first invention for achieving the above object, where l is a rectifier circuit, 2 is a transformer T1, and the primary side of this transformer T1 is A forward type DC-DC comprising an input circuit 3 connected between the rectifier circuit l and a plurality of output circuits 5 including a backup power supply charging circuit 4 connected to the secondary side of the transformer Tl.
Converter 6 is a switching circuit that is connected to bypass the backup power supply charging circuit 4 and supplies the output from the backup power supply 7 to another output circuit 5 via the transformer TI in the event of a power outage.

FIG. 2 shows a conceptual diagram of an uninterruptible power supply device according to a second invention for achieving the above object, in which 11 is a rectifier circuit, 12 is a transformer T2, and the primary side of this transformer T2. and a backup power supply charging circuit 1 connected to the secondary side of the transformer T2.
4, a flyback type DC-DC converter consisting of a plurality of output circuits 15, 16 is a switch that is switched in the event of a power outage, and 17 is a switch that boosts the output from the backup power supply 18 while switching during a power outage. Another output circuit 15 via transformer T2
This is the boost circuit that supplies the

[For production]

In the uninterruptible power supply of the first invention shown in FIG. 1, the DC output of a rectifier circuit 1 is converted into a required DC voltage by a DC-DC converter 2 to a plurality of output circuits connected to the secondary side of a transformer TI. is generated. One of the output DC voltages is used as a backup power supply charging circuit 4 to normally charge a backup amplifier power supply 7.

When a power outage occurs, a switching circuit 6 connected to bypass the backup amplifier power supply charging circuit 4 switches the DC output from the backup amplifier power supply 7 to the transformer T1.
It is supplied as an alternating current voltage to another output circuit 5 via.

In the uninterruptible power supply of the second invention shown in FIG. 2, the DC output of the rectifier circuit 11 is converted to a required DC voltage by a DC-DC converter 12 to a plurality of output circuits connected to the secondary side of the transformer T2. is generated.

One of these output DC voltages is the backup NB.
The charging circuit 14 normally charges a back amplifier power supply 18 via a switch 16.

When a power outage occurs, the switch 16 is switched, and the boost circuit 17 boosts the DC output from the back amplifier power supply 18 while switching and supplies it to the other output circuit 15 as an AC voltage via the switch 16 and the transformer T2. There is.

〔Example〕

Embodiments of the uninterruptible power supply according to the present invention will be described below.

FIG. 3 shows an embodiment of the uninterruptible power supply device of the first invention conceptually shown in FIG. This rectifier circuit 1 consists of a diode bridge DB and a capacitor C.
It consists of 1. This rectifier circuit l is connected to an input circuit 3 of a DC-DC converter 2, and this input circuit 3 is connected to one end of the primary winding of the transformer TI and the capacitor CI.
and a transistor Tri whose collector emitter is connected between the other end of the primary S line of the transformer TI and the capacitor CI.

The secondary windings of the transformer T1 each include a diode D2,
A rectifying and smoothing circuit consisting of D3, coil L1, and capacitor C2 is connected as output circuits 4 and 5. In this embodiment, output circuit 5 is used as a 5V load, and output circuit 4 is used as a backup power supply charging circuit for 48V. It is connected to a power source (battery) 7. Then, the transistor T
The collector emitter of r2 and the diode D5 are connected. The polarity of the winding of the transformer T1 is set as shown in the figure, and the converter 2 is a forward type DC with two outputs.
- forms a DC converter.

Next, the operation of this embodiment will be explained with reference to the time chart shown in FIG. 4. First, under normal conditions, the base terminal of the transistor Tri is controlled so that only the transistor Tri is turned on/off. Therefore, the DC voltage rectified by the rectifier circuit 1 is supplied to the output circuits 4 and 5 as an AC voltage by the transformer T1 and the transistor Tri. The output circuit 5 generates 5 V DC and supplies it to the load, and also operates to charge the bank amplifier power supply charging circuit 4 and the backup power supply 7.

Now, when a power outage occurs, the transistor Tri exhibits an off state, and the transistor Tr2 performs an on/off operation. Therefore, the backup power supply 7 is not charged, but conversely, the transistor Tr2 and the secondary winding of the transformer T1 are discharge through. This discharge current is supplied to the output circuit 5 as an alternating voltage by being controlled by the transistor Tr2,
Even during a power outage, the 5V load will be supplied with power.

FIG. 5 shows an embodiment of the uninterruptible power supply device of the second invention conceptually shown in FIG. 2, and in this embodiment, a rectifier circuit 11 is connected to a commercial power supply AC, Like the rectifier circuit 1, this rectifier circuit 11 also has a diode bridge D.
B and a capacitor C1. This rectifier circuit 11 is connected to an input circuit 13 of a DC-DC converter 12, and this input circuit 3 is connected to a transistor Trl whose collector emitter is connected between one end of the primary winding of a transformer T2 and a capacitor C1. Contains. Transformer T
A half-wave rectifier circuit consisting of a diode D4 and a capacitor C3 is connected to the output circuit 14 and the output circuit 1, respectively, on the secondary winding of 2.
In this embodiment, the output circuit 15
is a 5V load, and the output circuit 14 is a 48V bank-up power supply (battery) 1 as a back amplifier power supply charging circuit.
8 is connected. However, the output circuit 14 is normally connected to the transformer T2 via the switch 16, and is disconnected by switching the switch 16 during a power outage. During this power outage, transformer T2 and backup power tA
18 is connected through a boost circuit 17, and this boost circuit 17 is connected to a coil L2 whose one end is connected to the back amplifier power supply 18, and is turned on/off in the event of a power outage and stores energy in the coil L2 in the on state. A transistor Tr2 whose collector emitter is connected between the other end of the coil L2 and the backup power supply 18, and this transistor T
Switch 1 with the other end of coil L2 so as to supply the energy of coil L2 to transformer T2 only when r2 is off.
6, and a diode D5 connected between the contact point 6 and the diode D5. Incidentally, the polarity of the winding of the transformer T2 is set as shown in the figure, so that the converter 12 forms a two-output type flyback type DC-DC converter.

Next, the operation of this embodiment will be explained with reference to the time chart shown in FIG. 4 again. First, under normal conditions, the base terminal of the transistor Tri is controlled so that only the transistor Tri is turned on/off. Therefore, the DC voltage rectified by the rectifier circuit 11 is supplied to the output circuits 14 and 15 as an AC voltage by the transformer T2 and the transistor Tri. Then, the output circuit 15 generates 5 V DC and supplies it to the load, and the backup power supply charging circuit 14 connects the backup power source to the backup voltage via the switch 16 located at the solid line position. t[18
Works to charge.

Now, when a power outage occurs, the transistor Tri exhibits an off state, and the transistor Tr2 then performs an on/off operation, and the switch 16 is switched to the dotted line state at the same time as the power outage, so the backup power supply 18 is not charged.
Conversely, it starts discharging.

That is, when the transistor Tr2 is on, energy is stored in the coil L2, and when it is off, it is released to the secondary winding of the transformer T2 via the diode D5, thereby generating a boosted alternating current voltage. This generates an AC voltage on the input side of the output circuit 15, making it possible to supply power to a 5V load even during a power outage.

〔Effect of the invention〕

As described above, in both the uninterruptible power supply devices of the first invention and the second invention of the present application, the DC output of the backup power supply is converted into AC voltage by the transformer of the converter by operating the switching circuit only during a power outage. However, since it is configured to generate the required DC output from another output circuit, it does not require a transformer to lower the commercial power supply voltage or a duty ratio control circuit to lower the DC voltage. The circuit can ensure DC power supply both during normal times and during power outages.

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of an uninterruptible power supply according to the first invention, Fig. 2 is a principle block diagram of an uninterruptible power supply according to the second invention, and Fig. 3 is a principle block diagram of an uninterruptible power supply according to the first invention. A block diagram showing one embodiment of the device; FIG. 4 is a time chart diagram showing the operation of the embodiment of FIGS. 3 and 5; FIG. 5 is an implementation of the uninterruptible power supply according to the second invention. Block diagram showing an example. FIG. 6 is a block diagram showing the configuration of a conventional uninterruptible power supply. 1, 2 and 5, 1.11 is a rectifier circuit, 2.12 is a DC-DC converter, 3.13 is an input circuit, 4.14 is a backup Trii charging circuit as an output circuit, 5 .15 is the output circuit, 6 is the switching circuit, 7.18 is the back amplifier power supply, 16 is the switch, 17 is the boost circuit, Tl5T2 is the transformer, Ll, L2 are the coils, Trl, Tr2 are the transistors, D1 to D5 are the diodes , is. In the drawings, the same reference numerals indicate the same or corresponding parts. Patent applicant Fujitsu Co., Ltd. Agent Patent Attorney
Mori 1) Hiroshi (1 other person) 2-photo DC-DC,
Converter control signal Sliding diagram of the uninterruptible power supply according to the first invention Fig. 1 12 Flyback type DC-DC, converter Principle diagram of the uninterruptible power supply according to the second invention Fig. 2 Figure 3 of one embodiment! Appeasement 8 uq-,? --Igyuden Time Chart of implementation of the present invention (A) Figure 4 (1) Figure 4 (1) Figure 1 (A) of implementation of the invention of 14 yen 2 Figure 6 Configuration diagram of the conventional example

Claims (3)

[Claims] (1) a rectifier circuit (1), a transformer (T1), an input circuit (3) connected between the primary side of the transformer (T1) and the rectifier circuit (1), and a transformer (T1); a forward type DC-DC converter (2) composed of a plurality of output circuits (5) including a backup power supply charging circuit (4) connected to the secondary side of T1); and the backup power supply charging circuit (4). a switching circuit (6) that is connected to bypass the power supply and supplies the output from the backup power supply (7) to the other output circuit (5) via the transformer (T1) in the event of a power outage. Features an uninterruptible power supply. (2) a rectifier circuit (11); a transformer (T2); an input circuit (13) connected between the primary side of the transformer (T2) and the rectifier circuit (11); a plurality of output circuits (15) including a backup power supply charging circuit (14) connected to the secondary side of T2);
A flyback DC-DC converter (1
2), a switch (16) that can be switched during a power outage, and a switch (16) that boosts the output from the backup power supply (18) during a power outage while switching the switch (16) and the transformer (T).
2) A boost circuit (17) that supplies power to another output circuit (15) via the uninterruptible power supply. (3) The boost circuit (17) operates on/off with the coil (L2) during a power outage, and in the on state, the boost circuit (17) operates on/off with the coil (L2).
A transistor (Tr2) that stores energy in the coil (L2), and a diode (D5) that supplies the energy of the coil (L2) to the transformer (T2) only when the transistor (Tr2) is off. An uninterruptible power supply according to claim 2.