JPH0213234A - Uninterruptible power source equipment - Google Patents

Abstract

PURPOSE:To reduce the size without requiring a dedicated recharger by turning a thyristor ON with the voltage of a battery upon interruption of an AC power source and turning the thyristor OFF upon recovery from power interruption thereby performing recovery charge of the battery with rectified output of the thyristor. CONSTITUTION:Upon interruption of AC commercial power source, the output from a rectifier 2 drops to reverse the polarity of voltage across the anode and cathode of a thyristor (SCR) 16, and the voltage of a battery 5 is applied through diodes 20, 24 to the gate of the SCR 16 thus turning the SCR 16 ON. Consequently, DC power is fed from the battery 5 through the SCR to an inverter 6 thus feeding AC power continuously. Upon recovery of the AC commercial power source, a DC current is fed again from the rectifier 2 to the inverter 6. At this time, the polarity of the voltage between the anode and cathode of the SCR 16 is inverted and the SCR 16 is turned OFF. Furthermore, DC current is fed from the rectifier 2 to a diode 17 and recovery charge of the battery 5 is carried out through a contact 18.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention supplies DC power from a storage battery to an inverter in place of the rectified output of the AC power supply in the event of an AC power outage. The present invention relates to an uninterruptible power supply device that supplies AC power to a computer.

[Conventional technology]

Conventionally, this type of uninterruptible power supply device equipped with a storage battery has been constructed as shown in FIG. 2 or 3.

In Fig. 2, (1) is the input terminal of the 3-phase commercial AC power supply, +21 is the rectifier that rectifies the commercial AC from the power supply terminal (1), and (3a) and (4a) smooth the output of the rectifier f21. 1st reactor, 1st capacitor, i5H'j, storage pond, (6) is a constant frequency constant voltage inverter that converts the input DC into 3-phase AC and outputs it, (71, +81 are inverters) (6) is a second reactor and a second capacitor for completely smoothing the input current, and (9) is an output terminal that supplies the three-phase AC power of the inverter (6) to loads such as electronic computers and measuring instruments.

When the power supply is normal and the commercial AC power is supplied, the AC power at the input terminal (1) is rectified by the rectifier (21), and the rectified output of the rectifier (2) is connected to the reactor (3).

The capacitor (4) has L for smoothing.

Furthermore, the reactor (3a, 1.
7), the AC power is supplied to the inverter (6) via the smoothing circuit of the capacitor (8), converts the rectified output of the rectifier 121, and the AC power is supplied to the load via the output terminal (9) from the inverter (6). supplied to the

However, the storage battery 15) is charged by the direct current generated by the manual smoothing.

Next, when the commercial AC power supply fails, the DC current of the storage battery (5) is supplied to the inverter (6) via the reactor (7) and the capacitor (3), and the inverter (6) is activated based on the charging energy of the storage battery (6). 61 AC power is supplied to the load.

Furthermore, when the commercial AC power is restored, the AC power at the input terminal 11 is restored, and the rectifier (2
AC power based on the rectified output of 1 is input/output (6)
Based on the DC current formed by the input smoothing, the storage battery (6 capacitors (4a
) is supplied directly to the storage battery (5) through k, and at this time, unless large reactors (3a, l, and capacitors (4a) with large capacities are used, the power supply lip will prevent the storage battery 15) from being exposed to light or discharge. Return, t, storage battery (
5) The lifespan of 5) is reduced.

In addition, the inverter (6) performs a switching operation to form sinusoidal AC power, and at this time, the reactor (
7), if there is no capacitor (8), inverter (6)
The current on the input side of the storage battery (6) also changes sinusoidally due to the switching operation, and the storage battery +51 is repeatedly charged and discharged, thereby shortening the life of the storage battery (6).

Therefore, in the case of the device of FIG. 2, -reactor (3a
), a large capacity capacitor (4a) is used to sufficiently reduce the power supply rip, and the reactor (7) and capacitor (8) are also all large capacity capacitors (5). In order to operate in (6), it is necessary to sufficiently reduce the manufacturing pull, which significantly increases the size of the device.

Furthermore, even after recovery charging, a high current charging mixed current continues to be supplied to the storage battery (6).
51 life expectancy is unavoidable.

Therefore, in the device shown in FIG. 3, the storage battery is charged with a dedicated charger to eliminate all of the disadvantages shown in FIG.

In Figure 3, (3b) and (4b) are the third reactor and third capacitor for input smoothing corresponding to the glue handle 1 and capacitor (3a) and (4a) in Figure 1, and Oq is connected to the input terminal il+. (111 is a storage battery!) Main thyristor for the discharge path that supplies all the DC current to the inverter (6), [21, (13, H is the main thyristor for commutation control of the thyristor (11)) 4 reactor, an auxiliary thyristor, and a third capacitor, the thyristor (11) is connected to the reactor (121 thyristor (13, a series circuit of capacitor I is provided in parallel). It is a DC power supply.

Nari 1 thyristor f11) is ignited and turned on by a power failure detection circuit (not shown) at the time of a power failure of the commercial AC power supply.
The thyristor (+31) is fired and turned on by a recovery detection circuit (not shown) when the power is restored.

In addition, the charger GO is equipped with a power transformer to which AC power is supplied, a rectification and smoothing circuit for the secondary output of the transformer, and a series regulator or chopper circuit that controls the charging current of the storage battery (6). The charging current of the storage battery (5) is controlled according to the voltage of the storage battery (6).
51 high current recovery charging and small current floating charging after the recovery charging.

When the power supply is normal, the rectified output of the rectifier 121 is smoothed by the reactor (3b) and the capacitor (4b), and the DC current formed by the smoothing is transferred to the inverter (
6).

Moreover, the storage battery (5) is float-charged by the small charging current of the charger αO, and at this time, the thyristor +Il+.

(A storage battery (6) where a voltage in the opposite direction is applied to +3
is kept separated from the rectifier (2), inverter (6), etc. 71k.

Next, when the commercial AC power supply fails, the aforementioned power failure detection circuit turns on the thyristor (111), and the storage battery (5)
DC power is passed through the thyristor Ille to the inverter (
6).

Furthermore, when the commercial power supply is restored, the thyristor (13) is turned on by the aforementioned restoration detection circuit.

At this time, the electric charge of the capacitor (14), which is charged by the DC power supply, is transferred to the thyristor 031.
emitted through the thyristor (+n k, thyristor tm
A reverse voltage for commutation off is applied to the thyristor (111
turns off.

On the other hand, with the restoration of the commercial AC power supply, the inverter (6) is again supplied with a DC current based on the rectified output of the rectifier 12 (the rectifier 12).

In addition, the thyristor (11) is turned off, and the thyristor (131) is turned off due to the discharge of the capacitor (14J), and the storage battery (6) is again connected to the rectifier (2) and the inverter (6).
), etc., and is charged by the charger 00, and at this time, based on the voltage of the storage battery (5), it is recovered and charged by the large charging current of the charger/IG. After that, it is float-charged by the small charging current of the charger QG.

In the case of the device shown in Figure 3, when the power supply is normal, the storage battery (6
) is separated from the rectifier (21, inverter (6), etc.), and the storage battery (6) is charged only by the charger 00, so the storage battery 15) is charged by the power supply ripple and the operation of the inverter (6). The discharge does not repeat, and the reactor (3b) and capacitor (4b) can be surrounded by small objects with smaller capacitance than the reactor (3a) and capacitor (4a) shown in Figure 2. Actono (force, capacitor (3) can be omitted.

Moreover, since the charging current of the charger αOK, Il: storage battery 15) is controlled, and the charging current is particularly small during floating charging, a reduction in the life of the storage battery (6) due to charging is prevented.

[Problem to be solved by the invention]

In the case of the third charging device, the charger α operates on an AC power source.
It is necessary to provide a power transformer, a rectifier circuit, a smoothing circuit, etc. to G, and supply the charging current to the storage battery (6) with sufficiently reduced power supply ripple. Set based on current.

Therefore, as a charger CIG, a source transformer with a large capacity is included in the power supply section! ! A large charger is required, which is equipped with an E-current circuit, a smoothing circuit, etc., and a large-capacity transistor in the output stage.

Also, thyristor +I11. (Since each n'1 13 fires, a power failure detection circuit 5 recovery detection circuit is required,
Moreover, in order to force commutate the thyristor (11), a DC power supply (15+'c) is required to charge the capacitor 114.
In addition, it is necessary to use a large-capacity iris resistor (131, etc.).

Therefore, the device shown in Fig. 3 uses a storage battery (6) (although the lifespan can be extended, the large coil (3a) in Fig. 2, +7)
, capacitor (, ia), +81, it is necessary to provide a large charger αO, a power failure detection circuit 1 recovery detection circuit, a DC power supply (161, etc.), and there is a problem that miniaturization cannot be achieved.

SUMMARY OF THE INVENTION An object of the present invention is to provide an uninterruptible power supply device that can charge a storage battery without reducing its lifespan due to charging with a compact configuration that does not require a dedicated charger or the like.

[Tth means to solve the problem]

The means for achieving the above objects will be described below with reference to FIG. 1, which corresponds to an embodiment.

The present invention includes a rectifier 121 that rectifies an AC power supply, an inverter (6) that converts the rectified output of the rectifier (21) into AC power and supplies power to a load, and a DC power supply to the inverter (6) during a power outage of the AC power supply. 3. An uninterruptible power supply device comprising a storage battery (6) that supplies electric power to prevent power supply to the load from being stopped; The thyristor (
1G, and 11. provided in parallel with the thyristor tlfn. A series circuit of a contactor contact ti81 as an on/off switch means for recovery charging, and a diode for the charging path (1η1),
A floating charging transistor (191) provided in parallel with the power supply, and an ignition diode 120+2 provided in parallel with the contact point (18I) during a power outage of the power source (6). A voltage of all the above is applied to the gate of the thyristor (1 mark).

Resistor 2 as an ignition circuit for igniting the thyristor Hk
2. E+, Zener diode 3 brown series circuit, and the contact (lat- closes when the voltage of the storage battery (51) drops below the recovery charging reference voltage.

an opening/closing control circuit as a recovery charging control means that opens the contact (+81) when the voltage of the storage battery (6) becomes higher than the reference 1; and as the voltage of the storage battery (5) increases, the A technical measure is taken to include a drive control circuit @l as a floating charge control means to reduce and limit the current flowing through the transistor (191).

[Effect]

In the case of the uninterruptible power supply of the present invention configured as described above, when the power supply is normal and current power is supplied, the thyristor (
When the IE is reverse biased and turned off, the rectifier (2
The DC charging current based on the rectified output of 1 is connected to the diode (
Iη is supplied to the storage battery (5) via the transistor (5), and at this time, the control aIC of the drive circuit button causes the current flowing through the transistor (191) to become a small current for floating charging after recovery charging. At the same time, based on the thyristor (161 being turned off), the storage battery (5) does not discharge even if the current changes due to power supply ripples and the operation of the inverter (6), and only the storage battery 16) is charged. Ru.

In addition, when the AC power supply fails, the reverse bias of thyristor (+61) is released by cutting off the rectified output O, and thyristor +II is turned on by the voltage of the storage battery (5) via the ignition circuit, and the storage battery (6) DC power is supplied to the inverter (6) via thyristor t+e+2.

Furthermore, when the voltage of the storage battery (5) drops below the recovery charging reference voltage due to discharge during a power outage, the contact - is closed.

When the AC power is restored, the thyristor (16) is reverse biased again by the rectified output of the rectifier (21).
The thyristor (1G) is turned off without performing any special commutation side @J, and a large charging current based on the rectified output flows through the diode Q71. The storage battery (51
The storage battery (5) is recovered and charged with a large current.

Furthermore, when the 'Narita of the storage battery (5) becomes higher than the above-mentioned basis by one recovery charge, the contact is opened and the storage battery (5) is charged with a diode (t17) and a transistor (191) via the J-P light charge. [E current is supplied, and the process shifts to the above-mentioned floating charging after recovery charging.

Therefore, the rectified output of the rectifier (2) supplies power to the inverter (6) and charges the storage battery (5), and at this time, the storage battery (6) is charged by opening and closing the contacts. The X current is slightly varied, and after recovery charging, the storage battery (61) is floatingly charged with a small charging current.

Also, while charging the storage battery 16), the thyristor +161
off:? : Based on the original prevention of discharge of the storage battery (6), the storage battery +51 continues to be charged without being discharged even if the charging current fluctuates due to the power supply ripple or the operation of the inverter (6).

〔Example〕

(3c) and (4c) are the fifth reactor for smoothing the rectified output of the rectifier (21), the fifth capacitor, (16
1 is the anode, the cathode is the anode of the storage battery (5), and the storage battery (51 is a thyristor for DC power supply connected to the input terminal of the inverter (6), 07 is a charging device whose anode is connected to the cathode of the thyristor (161) The diode for road use, the bad thing is the thyristor [l1m anode and diode 1
17) is a contactor contact as an opening/closing switch means provided between the cathode of the diode f174. A series circuit of contacts (181) is provided in parallel to the thyristor.

(+91 is an NPN type transistor for floating charging, the collector is connected to the cathode of the diode f+71, and the emitter is connected to the anode of the storage battery (5).

The mount is an ignition guide provided in parallel with the contact (181), and its anode and cathode are connected to the cathodes of the thyristor (anode of 161, diode Q7), respectively. 21) is the collector of the transistor (19). This is a sixth smoothing capacitor provided between the ground and the ground.

221, e231. +241 is a thyristor (161
The ignition times @total form il, %2 resistor is a Zener diode, and the anode of the diode I24) is a resistor @,
'22't: is connected to the input terminal of the inverter f6] through n, and the cathode of the diode (24) is connected to the cathode of the diode (lη), and the resistor n, @
The gate of the thyristor (161) is connected to the connection point of the thyristor (161).

! 2 is a voltage relay to which the voltage of the storage battery +51 is applied, and operates to close the relay contact (c) only when the voltage of the storage battery (5) is higher than a predetermined recovery charging reference voltage.

02m is a time-limited relay to which the voltage of the storage battery (6) is applied via a contact, and when activated based on voltage application, the time-limited contact 2& is closed after a certain delay time has elapsed. is a contactor to which tEE of the storage battery (6) is applied to contact 2 &, and contact f is applied by excitation based on voltage application.
Hold 281 open. (301 is a relay (to).

(This is a contact end opening/closing control circuit formed by 271 and a contactor, and constitutes a recovery charging control means.

The transistor (191) is supplied with a control signal to the base of the transistor (191). It is a drive control circuit and forms the floating charge control means, and the transistor (+91 emitter of the accumulator (51) direct current or the collector of the transistor (19) direct current It operates as a power source, and varies the level or pulse period of the 1st control signal depending on the voltage of the storage battery [6], and the transistor +19
Fully controls the current flowing through 1.

When the power supply is normal and commercial AC power is supplied, the rectified output of the rectifier (2) based on the AC power supply at the input terminal (!1) is smoothed by the reactor (3C) and the capacitor (4), and the DC The current is inverter (6
), and AC power based on the rectified output of the rectifier (21) is supplied to the computer from the output terminal (9).

Supplied to loads such as measuring instruments.

Further, a DC current formed by smoothing of the reactor (3c) and the capacitor (4c) is supplied to the storage battery (6) via the diode 071 and transistor Q91i, and the storage battery (6) is charged.

At this time, the voltage at the cathode of SIRISQ (Q61) becomes higher than the voltage at the anode, causing it to be reverse biased and kept off.

′! In addition, since the voltage of the storage battery (6) is maintained at a voltage higher than the recovery charging reference voltage due to charging, the contact point (to).

Q& is held closed and contact - is held open.

Furthermore, based on the almost fully charged voltage of the storage battery (5),
The control circuit '311 controls the base bias voltage or switching frequency of the transistor (transistor 119) so as to reduce and limit the conduction current of the transistor (191) to the small current necessary for floating charging after charging is completed.

Therefore, the floating charge of the storage battery (61) when the power supply is normal is
This is carried out by a small charging current based on the rectified output of the rectifier (2), and at this time, the discharge of the storage battery (5) is prevented by turning off the thyristor t161, and for example, the input of the inverter (6) is prevented by the operation of the inverter (6). Even if the DC current on the side fluctuates and the charging current increases or decreases, the storage battery (
51 continues to be charged without being discharged.

Next, when the commercial AC power supply fails, the output of the rectifier 121 decreases due to the power outage, and the polarity of the voltage between the anode and cathode of the thyristor (161) is reversed, and the voltage of the storage battery 15+ is transferred to the thyristor αG via the diode. 9, the thyristor (161) is fired and turned on.

Therefore, direct current flows from the storage battery (5) to the inverter (6) via the thyristor [161t],
) is supplied to the inverter (6) instead of the rectified output of the rectifier 12.1, and the AC output of the inverter (6) continues to be supplied with power.

When the voltage of the storage battery (5) decreases due to discharge during a power outage, and the voltage of the storage battery (6) drops below the recovery charging reference voltage mentioned above, the operation of the relay 25 stops and the contacts - , f'81 are opened, the excitation of the contactor 2 is stopped, and the contact ends are closed.

Next, when the commercial AC power is restored, the DC IL current based on the rectified output of the rectifier 12 begins to be supplied to the inverter (6) again, and at this time, the zero voltage polarity between the thyristor Bee and D anodes and cathodes is reversed, and the The thyristor (+cp) is commutated and turned off again without proper commutation control.

Also, DC ionization based on the rectified output of rectifier 1 (2) occurs in diode t+71'f! At this time, if the contact - is closed, the DC current through the diode O is supplied to the storage battery (61) through the contact jH5f, and the storage battery (6) is recovered and charged by the large charging current. Ru.

3. Even during recovery charging, the storage battery 161 continues to be charged without being discharged based on the thyristor (10 being turned off).

Then, when the voltage of the storage battery ([i) becomes higher than the recovery charging reference voltage due to recovery charging and the storage battery (6) is almost completely charged, based on the increase in the voltage of the storage battery (6),
The relay 271 is activated, the contacts are closed, and the relay 271 is energized.

Further, when a short fixed period of time set as the delay time has elapsed from activation of relay 2'71, contact 2& is closed again, contactor 4 is operated, and point 1181 is opened again.

Then, when the contact (18) is opened, the direct current through the diode α chip is supplied to the storage battery (6) via the transistor α (g), and at this time, the control circuit (6) based on the voltage of the storage battery (5) 31), the storage battery (5) is again floatingly charged with a small current.

By repeating the above operations, a rectifier is created! 2i L:D Power supply of inverter (6) based on D rectified output and storage battery (
6) is performed, and AC power continues to be supplied to the load regardless of whether there is a power outage of the AC power supply.

Then, based on the rectified output of the rectifier [21], the storage battery (
51 is charged, a power transformer, a rectifier circuit, which forms a direct current for charging from the AC power supply of the input terminal +11,
The device can be formed without providing a dedicated power supply section such as a smoothing circuit.

In addition, the storage battery (
5) is prevented from discharging, power supply rip, inverter (6)
Even if the charging current fluctuates due to the operation of
4C) is the coil (3b) and capacitor (4C) shown in Figure 3.
A device with a small capacity equivalent to b) is used, and the second
- Coils and capacitors corresponding to coil (7) and capacitor; 8) in the figure are omitted.

Furthermore, based on the control of the control circuit C (II), the conduction current of the transistor Q91 is, for example, 11500 to 1/1
The capacitance is as small as 00C, and the transistor is formed using a small capacitance transistor.

S, control circuit! 311 K, c, transistor during recovery charging! +91 'jz held completely off and charging current through transistor ts' only during floating charge after recovery charge? It is also possible to supply it to the storage battery [5].

Oh, the control circuit! 31), the transistor 091t-
Of course, the same effect can be obtained by either series regulator control or chopper control.

[Effects of the Invention J] Since the present invention is configured as described above, the rectified output of the rectifier supplies power to the inverter and charges the storage battery, and also provides the effects described below. Open.

Immediately after the AC power is restored, the storage battery is recovered and charged with a large current through the opening/closing switch means, and during the recovery period, the storage battery is fully floating-charged with a small current through a transistor for floating charging, In addition, without performing special commutation control, the thyristor is turned off while the storage battery is being charged, preventing discharge of the storage battery during charging, and charging the storage battery without causing power supply ripples or fluctuations in charging current due to inverter operation. By making it possible to charge the storage battery without using a dedicated large charger, and without using a large glue handle or capacitor for smoothing the rectified output, the battery life can be prevented from being shortened due to charging. This makes it possible to downsize the device.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram of one embodiment of the uninterruptible power supply of the present invention,
FIGS. 2 and 3 are wiring diagrams of conventional uninterruptible power supplies, respectively. (21... Rectifier, (6)... Storage battery, (6) Inverter 1.1 mark... Thyristor, (171... Diode for charging path, ; 181... Contactor contact, (191...
・Transistor for floating charging, diode for ignition, @, 1231. (241...first and second resistors forming the ignition circuit, Zener diode, 'ka...opening/closing control circuit, !311, drive control circuit.

Claims (1)

[Claims] (1) A rectifier that rectifies an AC power supply, an inverter that converts the rectified output of the rectifier into AC and supplies power to a load, and supplies DC power to the inverter to stop power supply to the load in the event of a power outage of the AC power supply. A thyristor for supplying the DC power provided between the storage battery and the input terminal of the inverter; and a charging path provided in parallel with the thyristor. a series circuit of a diode and an on/off switch means for recovery charging; a transistor for floating charging provided in parallel with the on/off switch means; and an ignition circuit provided in parallel with the on/off switch means in the event of a power outage of the AC power supply. an ignition circuit that applies the voltage of the storage battery via a diode to the gate of the thyristor to ignite the thyristor; recovery charging control means for closing and opening the opening/closing switch means when the voltage of the storage battery becomes higher than the reference voltage; and reducing and limiting the conduction current of the transistor as the voltage of the storage battery increases. What is claimed is: 1. An uninterruptible power supply device comprising: floating charge control means.