JPS6258837A - Control power source circuit for power failure free power unit - 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] [Technical Field of the Invention] The present invention is composed of a thyristor, a transistor, a light or other semiconductor switch, uses a storage battery as a backup power source, and provides an uninterrupted, constant-voltage, constant-frequency AC power to a load. The present invention relates to a control power circuit for an uninterruptible power supply that supplies power.

[Technical background of the invention and its problems]

An uninterruptible power supply that supplies constant voltage, constant frequency AC power to a load without interruption requires an uninterruptible control power supply circuit as a power source for a control circuit that controls the device. Conventional uninterruptible power supply control power supplies include receiving an external uninterruptible control power supply, or using a DC-DC converter to convert the desired constant voltage DC power from a storage battery as a backup power source for the uninterruptible power supply. A control power source is created by converting the power source, or as known from Japanese Patent Application Laid-Open No. 60-5779,
A DC circuit connected to a storage battery as a backup power source, a control power source created by converting it to the desired constant voltage DC power via a QDC-DC converter, and an uninterruptible constant voltage constant frequency AC power source from an uninterruptible power supply. There is a control power supply circuit system that includes means for selecting the output and a control power supply produced by converting it into a desired constant voltage DC power via a JAC-DC converter, and multiplexes the control power supply circuits.

However, in the control power supply circuit of the conventional uninterruptible power supply configured as described above, the power supply for driving the semiconductor switch occupies a large proportion of the control power supply of the uninterruptible power supply, and the power supply for driving the semiconductor switch accounts for a small proportion of the control power supply of the uninterruptible power supply. DC-DC converters, which must tolerate large DC input voltage fluctuations because the circuit power supplies are made with the same control power circuit,
The AC-DC converter provided for multiplexing control power supplies has a large capacity, is expensive, and has a large size.

[Object of the present invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a control power supply circuit for an uninterruptible power supply that is small and inexpensive.

[Summary of the invention]

In order to achieve this object, the present invention creates a power supply for driving a semiconductor switch of an uninterruptible power supply by combining DC voltage converted by a JAC-DC converter from AC input and AC output. By using the DC voltage converted by the storage battery output and the DO-DC converter as a power source for electronic circuits and other control circuits, the capacity of the DC-DC converter and AC-DC converter can be reduced to a small size. ,
It is characterized by realizing miniaturization and cost reduction of the control power supply circuit.

[Embodiments of the invention]

FIG. 1 is a rough circuit diagram showing a first embodiment of the present invention. Here, an uninterruptible power supply using a thyristor in the rectifier circuit and a gate turn-or-thyristor (hereinafter referred to as GTO) in the inverter circuit is taken as an example. explain.

In Fig. 1, 1 is an AC power supply, 2 is an RF charger that rectifies the AC power, supplies DC power to the inverter circuit, and charges a storage battery, 3 is a DC smoothing reactor, 4 is a storage battery, and 5 is a DC Smoothing capacitor, 6 is G
TO inverter circuit, 7 is a load, 8 is an AC-DC converter for creating a multi-control power source with AC input, 9 is an AC-DC converter for creating a multi-control power source with AC output, 8A
, 9A u control power transformer, 8B and 9B are rectifiers,
10 is a control power supply capacitor, 11 is a storage battery and a PC-CC converter for producing a multi-control power supply, 12 is an electronic circuit and a control circuit, and 13 is a gate circuit of a GTO inverter.

In FIG. 1, AC-DC converters 8 and 9 are:
It consists of a simple configuration of 8A and 9 control power transformers, 8B and 9B rectifiers, and both AC-D.

The outputs of the converters are combined to create power for the 13 GTO inverters and the gate circuit of RF charger 2. The 11 DC-DC converters input the output of the storage battery 4, which has a large voltage fluctuation range, and create power supplies for the 12 electronic circuits and control circuits.

The power supply for the gate circuit of the inverter 6 and RF charger 2 is a control power supply made by the input and output of the uninterruptible power supply, so it can be used from the AC input at startup, or from the storage battery output from 4 during a power outage. Power is secured through the inverter circuit. In addition, even if the inverter circuit 6 breaks down during an AC input power outage, the switching elements of the inverter circuit 6 can immediately switch on the GTO and RF charger 2.
Since the switching element turns off the thyristor,
There is no problem even if the gate power supply is lost. Furthermore, the power source for the electronic circuit and control circuit 12 including protection and failure indication at this time is DC-D from the storage battery 4 to 11.

Power is secured because it is taken through a converter.

FIG. 2 shows a second embodiment of the present invention, which is a control power supply circuit for an uninterruptible power supply including a chipper circuit in the DC section.

In Fig. m2, the same reference numerals as in Fig. 1 have the same functions, and the explanation thereof will be omitted.

In FIG. 2, 14 is a chopper circuit, 15 is a chopper smoothing reactor, and 16 is a chopper gate circuit.

Figure 2 uses the same control power supply system as Figure 1, and
In addition to the power supply for the inverter 3 and the RF charger 2-gate circuit, the power supply for the 16 chopper gate circuits that control the 14 chopper circuits is also provided by the control power generated by the AC-DC converters 8 and 9. be.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the capacity of the DC-DC converter, which is expensive due to its wide range of DC input voltage fluctuation and large capacity, and to reduce the capacity of the control power supply circuit. It is possible to realize miniaturization and cost reduction without reducing reliability. Further, by using a separate route for the gate power supply whose capacity differs greatly depending on the capacity of the uninterruptible power supply, there is no need to change the capacity of the DC-DC converter, and standardization of the control power supply circuit becomes easy.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention, and FIG. 2 is a second embodiment of the present invention showing an uninterruptible power supply including a chopper circuit.
FIG. 3 is a circuit diagram of an embodiment of the invention. 1... AC power supply, 2... RF charger, 3...
・DC smoothing reactor, 4... Storage battery, 5... DC smoothing capacitor, 7... Load, 8, 9... AC-D
C converter, 8A, 9A-=control power transformer, 8B
, 9B... Rectifier, 10... Control power supply capacitor, 11... DC-DC converter, 12... Electronic circuit and control circuit, 13... Inverter gate circuit,
1.4... Chopper circuit, 15... Smoothing reactor for chopper, 16... Chopper gate circuit. Agent Patent Attorney Noriyuki Chika Yudo Hirofumi Mitsumata Figure 1/U Figure 2

Claims (1)

[Claims] A rectifier circuit that takes AC power as input and converts the AC power into DC power, a storage battery circuit connected to the DC circuit converted by the rectifier circuit, and an uninterruptible constant voltage constant frequency circuit that uses the DC power as a load. In an uninterruptible power supply equipped with an inverter circuit that converts into AC power, a control power supply circuit of the uninterruptible power supply converts the AC power input to the uninterruptible power supply into a desired DC power supply as a power source for driving the inverter circuit. an AC-DC converter that converts and outputs power, and an AC-DC converter that converts uninterruptible, constant-voltage, constant-frequency AC power output from the uninterruptible power supply into desired DC power;
and a circuit for selecting either of the outputs of the two converters, and a DC-DC converter that converts the DC power of the storage battery circuit into desired DC power as a control power source for an electronic circuit or the like. Control power circuit for uninterruptible power supply.