JPH01122327A - Power supply device - Google Patents

Abstract

PURPOSE:To simplify and miniaturize the whole of a device, by a method wherein the output DC current of a storage battery is changed so as to have a high frequency and the generating voltage of a reactor is boosted to supply the DC voltage of a high voltage to an inverter unit. CONSTITUTION:DC current, obtained by rectifying commercial AC current through a rectifying circuit 10 and smoothing it by a resistor 12 and a capacitor 11, is converted by a transistor 14 so as to have a high frequency while the voltage of high frequency, which is generated at the secondary side of an output transformer 13, is rectified and smoothed to output it to respective loads. When the supply of the commercial AC is interrupted, it is detected by a chopper control circuit 50, a high-frequency switching signal is outputted to a FET 46 and the output DC current of a storage battery 33 is supplied to an inverter unit 15 through a protecting fuse 40, a reactor 45, the FET 46 and a diode 47. A high frequency AC current, converted so as to have high frequency and generated at the secondary side of a transformer 13, is rectified and smoothed to supply it to respective loads. Accordingly, the loads may be driven even when the commercial AC power supply is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a power supply device that is applied to electronic devices and various information devices using a CPU, and has a backup function in the event of a commercial AC power outage.

[Conventional technology]

BACKGROUND ART Conventionally, a power supply device that has been applied to electronic devices and various information devices using a CPU and has a backup function in case of a commercial AC power outage has been configured as shown in FIG. 2, for example.

In the figure, (1) is an input terminal into which commercial AC is input, (2) is a rectifier that rectifies the commercial AC via input terminal (1), and (3) is an input terminal whose input terminal is the output terminal of rectifier (2). The inverter section (4) is a changeover switch, and one changeover terminal (4a) is connected to the input terminal (1) as a bypass line. directly connected to the other switching terminal (4
b) is connected to the output terminal of the inverter section (3), and the switching piece (4C) is connected to a load such as an electronic device (not shown) via the output terminal (5).

(6) is a backup storage battery, (7) is an input terminal (
1) a charger for charging the storage battery (6) connected to the battery (8);
is a si-risk switch υ, and when a commercial AC power outage occurs, the si-risk switch (8) is turned on and supplies the output DC of the storage battery (6) to the inverter (3).
The output of the storage battery (6) is converted to AC and supplied to the load, and when the commercial AC power outage recovers, the SI risk switch (8) is turned off and the charger (7) starts charging the storage battery (6). It is done. At this time, the storage battery (6) is floatingly charged.

However, in this case, since the inverter section (3) converts the AC frequency to 50 or 60 ratio, which is the same as the commercial frequency, the size is large and the heat loss is large, so cooling fins are required. However, a large capacity storage battery must be used, and the switching operation of the thyristor switch (8) is complicated, resulting in a lack of reliability.

Therefore, a power supply device shown in FIG. 3 has been considered as a power supply device with a simplified configuration and miniaturization.

That is, in Fig. 3, (9a) and (9b) are the input terminals into which commercial AC is input, and αQ is the input terminal (9a).
).

(9b) is an input side rectifier circuit consisting of a diode bridge rectifier circuit that rectifies the commercial alternating current through the input circuit 01), one end of which is connected to the positive output terminal (10a) of the rectifier circuit α0 via a resistor @, and the other end of which is connected to the rectifier circuit. A smoothing capacitor connected to the negative output terminal (10b) of αq, 03 is an output transformer, and a primary coil (18a) whose one end is connected to the positive output terminal (10a) via a resistor @, Secondary coil (+3b)
and an auxiliary coil zv (18c) wound around one end of the primary coil) v (13a).

α 弔 is an NPN type transistor which is a switching element for an inverter, and its collector and emitter are primary coil/L
/(I3a) and the negative output terminal (10b), and the primary coil z+/(13a) and the transistor α constitute an inverter section α9.

αO is a transistor α provided in parallel with the capacitor αυ
The inverter control unit outputs a high frequency switching signal at the pace of → to control the output of the inverter aO, αη is the anode, and the transformer (to ) is a rectifier diode whose anode is connected to one end of the secondary coil (13b), and q is a rectifier diode whose anode is connected to one end of the secondary coil (13b).
3b) a smoothing capacitor connected to the other end, (20a
) and (20b) are output terminals, which are connected to both ends of capacitor 4 and to a load (not shown).

121) is a backup storage battery, and its positive terminal is connected to one output terminal (20a) via the anode and cathode of the backflow prevention diode (A), and its negative terminal is connected to the other output terminal. , the output of the storage battery Q1) is directly supplied to the load during a commercial AC power outage.

In the case of the device shown in FIG. 3, the configuration of the inverter section αQ is made smaller than that shown in FIG. Although the overall configuration of the device can be simplified and miniaturized, it is usually necessary to supply two or more different voltages to the load instead of just one type of drive voltage. However, this cannot be satisfied, and two or more secondary coils and two or more storage batteries must be provided for each of the transformer 03.

Therefore, as shown in FIG. 2nd carp/v (13b)'.

(13b)', the first carp/l/(13b)'
Connect one end to the output terminal (24a) via the anode and cathode of the rectifier diode (c), and
The other end of (13b)' is connected to the output terminal (24b), and both output terminals (24a).

A smoothing capacitor (C) is provided between (24b) and one end of the second coil (13b)' is an anode of a rectifying diode (A).

Connected to the output terminal (27a) via the cathode, and connected the other end of the second coil (18b) to the output terminal (27b) via the cathode and anode of the rectifier diode (to),
Connect the middle tap of the second coil (L3b) to the output terminal (27c
), a smoothing capacitor (7) is provided between the output terminals (27a) and (27c) and between the output terminals (27c) and (27b), and a backup storage battery G
A power supply device has been proposed in which the positive terminal of υ is connected to one end of the primary coil (13a) via a backflow prevention diode (32), and the negative terminal is connected to a negative output terminal (10b).

Note that an output side rectifier circuit is constructed by the diode □□□ and the diodes (A) and (C), respectively.

In this case, between output terminals (24a) and (24b), between output terminals (27a) and (27c), and between output terminals (27C)
, (27b) generate different DC voltages between them,
Since it can output, it becomes possible to simultaneously drive loads with different drive voltages.

[Problem that the invention seeks to solve]

However, in the case of the device shown in Fig. 4 described above, the output transformer is 0.
Since the storage battery 0υ is installed on the primary side of 3, the storage battery is 1
On the other hand, it requires a storage battery Gυ with a higher voltage than those commercially available, and there is a problem in that it is extremely dangerous to handle.

Therefore, the technical object of the present invention is to enable a commercially available low-voltage storage battery to back up the load during a commercial AC power outage.

[Means for solving problems]

Means for solving the problems of the prior art described above will be explained using FIG. 1 corresponding to an embodiment.

That is, in the present invention, an input side rectifier circuit αQ that rectifies commercial AC, and both output terminals (10a) of the input side rectifier circuit αO, (
10b) The primary coil of the output transformer α provided between
(13a) and an inverter section α1 consisting of a transistor α→ as a switching element for the inverter, and a rectifier as an output side rectifier circuit that rectifies the output AC on the secondary side of the output transformer α and outputs DC to the load. The diodes (c) and (a) are connected in series between the storage battery (33) for commercial AC power outage backup, the charge control circuit contact of the storage battery (33), and both output terminals of the storage battery (33). The reactor #l4FA provided in Connected chopper circuit (4(1)).

Said FET! A smoothing capacitor 14 connected in parallel to the FET 14 is activated during a power outage of the commercial AC.
A chopper control circuit (50) that outputs a high frequency switching signal is provided to the control terminal of 61.

[For production]

Therefore, according to this invention, when a commercial AC power outage occurs,
The chopper circuit (FET!4 of 4(1)) whose switching is controlled at high frequency by the chopper control circuit (50)
61, the output DC of the storage battery (33) is made to have a high frequency,
The voltage generated by the chopper circuit (44) is applied to the external voltage by a capacitor (49) and smoothed to supply a high DC voltage to the inverter section α9.
As for 3), there is no need to use a high voltage battery as in the past, and the storage battery (33) is easier to handle than before.
Moreover, since the configuration of the charging circuit (circle, chopper circuit (44!) is simple, the configuration of the entire device can be simplified and the device can be made smaller.

〔Example〕

Next, the present invention will be explained in detail with reference to FIG. 1 showing an embodiment thereof. In FIG. 1, the same symbols as those in FIG. 4 indicate the same or corresponding parts.

In FIG. 1, e31 is a storage battery for commercial AC power outage backup (341 is a charging circuit for the storage battery 133).

Commercial alternating current is rectified by a rectifier, and a smoothing capacitor (
7), the obtained direct current is further smoothed by a smoothing reactor/V (381, capacitor (39)) via an NPN charge control transistor (37) to obtain a smooth direct current. This smooth DC current is supplied to the storage battery (33) via the protective fuse +40+ and the current limiting resistor (41) to charge the storage battery (33).

(4 is a charging control circuit, which detects a commercial AC power outage and power outage recovery, controls the switching of the transistor (3η), and controls the charging current of the storage battery (33).

(43! is a flywheel diode, (circle is a chopper circuit, and a reactor is connected between both output terminals of the storage battery (331) via fuse (40) and resistor 1411) zl/f
45) and F as a chopper switching element
E T +46+ are provided in series,
F E T +46 via the backflow prevention diode Aη
Both ends of + are both output terminals (10a) of the rectifier circuit (l[)
, is connected to (Job).

(481 is a flywheel diode installed in parallel with the resistor [11, 09) is a diode (F through 4η)
The smoothing capacitor (50) installed in parallel with E T +46+ is a chopper control circuit that detects a commercial AC power outage and outputs a high frequency switching signal to the gate of FET 1461 to perform high frequency switching of FET +46+. let

The storage battery 131 is a commercially available relatively low-voltage battery of about 6 to 60V, such as a sealed 24V lead-acid battery or Ni-Cd battery, and is floating-charged by a charging circuit. There is.

When the commercial alternating current is normal, the commercial alternating current is rectified by the rectifier circuit 0 and smoothed by the resistor and capacitor αυ, and the resulting direct current is transferred to the transistor α → is converted into a high frequency by high frequency switching, a high frequency is generated on the secondary side of the output transformer 030, and the generated high frequency alternating current is rectified and smoothed and output to each load.

Next, in the event of a commercial AC power outage, the chopper control circuit (
50) detects a power outage, a high frequency switching signal is output to F E Ti 461, and F E T 14
61, the output DC of the storage battery (33) is connected to the protective fuse 140), react/l/t4
I51, FET (46)=#, diode (supplied to the inverter section 09 via the nephew, converted to high frequency by the inverter section OG, and the high frequency alternating current generated on the secondary side of the transformer 03 is rectified and smoothed. is supplied to each load, and even if a commercial AC power outage occurs, the loads will be driven.

By the way, during the ON period of the FET 146), a voltage with the polarity shown in the figure is generated in the reactor (451), and then during the OFF period of the FET 1461, a voltage with the polarity opposite to that shown in the figure is generated in the reactor (451). , diode +471
, is discharged through the capacitor (491) and the diode (481), and then the FET (40) is turned on and the above operation is repeated.At this time, the voltage generated in the reactor is supplied to the capacitor (49). , is boosted and supplied to the inverter section α.

Furthermore, when the commercial AC power outage recovers, the chopper control circuit side detects the power outage recovery, cuts off the switching signal to FET 146), stops the operation of the chopper circuit (44!), and switches the rectifier circuit Qfl and inverter α1 to DC power is supplied to the load through the normal operation described above.

On the other hand, recovery from the power outage is also detected by the charging control circuit (421), and as described above, the transistor t3TI is switched by the control signal from the charging control circuit [4Z], and the charging circuit (34) returns the storage battery (331) that was discharged during the power outage.
After charging is completed, floating charging is performed.

Therefore, according to the embodiment, when a commercial AC power outage occurs, the chopper circuit (Nakano FET +46+) whose switching is controlled at high frequency by the chopper control circuit (50)
As a result, the output DC of the storage battery G3) is made into a high frequency, and the voltage generated by the chopper circuit (441) is boosted and smoothed by the capacitor (49) to supply a high DC voltage to the inverter section Q. , storage battery (3
As for 3), there is no need to use a high voltage battery as in the past, and the storage battery (33) is easier to handle than before.
Moreover, by employing a transformer-less charging circuit (341) and a high-frequency switching chopper circuit (341), the configuration can be simplified and the device can be made smaller.

In addition, in the above embodiment, when the commercial AC is normal, F E
T 1461 is turned off, and due to a power outage, F E
Although the T +46+ was driven, switching operation may also be performed even when the commercial AC is normal. In this case, the commercial power supply is rectified by the rectifier circuit αO, and the DC voltage is smoothed.
The voltage generated at the capacitor (49) should be slightly lower.

Still transistors (14), FE Tf461
Of course, other switching elements may be used instead.

Furthermore, the inverter section αQ may be of a half-bridge type or a full-bridge type.

〔Effect of the invention〕

As described above, according to the power supply device of the present invention, during a commercial AC power outage, the switching element of the chopper circuit whose switching is controlled at υ high frequency by the chopper control circuit makes the output DC of the storage battery high frequency, and the reactor of the chopper circuit Since the generated voltage can be boosted and smoothed by a smoothing capacitor to supply high voltage DC voltage to the inverter, there is no need to use a high voltage storage battery as in the past, and the handling of storage batteries is easier than before. Since it is easy to use, and the structure of the charging circuit and chopper circuit is also simple, the structure of the entire device can be simplified, and the device can be made smaller, which has great effects.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram of one embodiment of the power supply device of the present invention;
4 through 4 are connection diagrams of different conventional examples. 00... Input side well-structured circuit, (10a), (10b).
...Output terminal, θ3...Output transformer, (18a
)...Primary coil, (1→...transistor, qυ
...Inverter section, (Foundation), (E), f:;! 9...
・Rectifier diode, (33)...Storage battery, Makoto...
Charging circuit, (44)...Chopper circuit, +4151.
...Reactor, (461...FET, (49)...
- Smoothing capacitor, (50)...Chopper control circuit.

Claims (1)

[Claims] (1) An input-side rectifier circuit that rectifies commercial alternating current; an inverter section consisting of a primary coil and an inverter switching element of an output transformer provided between both output terminals of the input-side rectifier circuit; an output-side rectifier circuit that rectifies the output AC of the next side and outputs DC to the load; a storage battery for commercial AC power outage backup; a charging circuit for charging the storage battery; and a circuit provided in series between both output terminals of the storage battery. a chopper circuit consisting of a reactor and a chopper switching element, wherein both ends of the chopper switching element are connected to both output terminals of the input rectifier circuit; and a smoothing capacitor connected in parallel to the chopper switching element. and a chopper control circuit that operates during a power outage of the commercial alternating current and outputs a high-frequency switching signal to a control terminal of the chopper switching element.