JPS62193519A - Momentary interruption free 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] Normally, the rectifier output is supplied to the load via a diode, but the storage battery is charged at a voltage slightly lower than the rectifier output voltage, and a diode is also provided for the storage battery output. The output side of the diode is connected, and in the event of a power outage, it automatically switches to the storage battery to supply power without interruption.

[Industrial application field]

The present invention relates to power supplies for various devices, and particularly relates to improvements in uninterrupted power supplies.

With the advancement of the information society, various electronic devices have appeared, but power supply devices are essential for these devices.In particular, online devices require measures against power outages, and the trend toward uninterrupted power supply is progressing. It is being

To achieve uninterrupted power outage, a method is used that automatically switches to AC power instead of commercial power source converted from batteries etc. during a power outage, but since it is a substitute for commercial power source, it is not necessary for each device. , one AC power supply is provided centrally, and a failure thereof affects all devices using the AC power supply. Furthermore, the inverter that converts direct current to alternating current is large and expensive, and therefore the alternating current power source is also large and expensive.

Therefore, there is a need for a small, inexpensive, uninterrupted power source that does not use an inverter and is distributed to each device.

[Conventional technology]

FIG. 3 is a block diagram of a conventional uninterruptible power supply device.

In the figure, normally the alternating current of the commercial power supply is triac TI.
It is supplied to various devices via.

The commercial power source is rectified by a rectifier 1, converted to a required DC voltage by a DC-DC converter 2', and charged to a storage battery 3'. During a power outage, the inverter 4 converts the storage battery 3' into alternating current, which is the same as the commercial power source, and the triac T2 becomes conductive instead of the triac T1, so power is supplied to various devices via the triac T2.

Switching between triacs Tl and T2 will be explained.

The commercial power supply is rectified by diode D and connected to resistor R1゜R2.
The divided voltage created by is applied to the (-) terminal of the comparator 5 and compared with the reference voltage VF applied to the (+) terminal. Normally, the output of the comparator 5 is at a low level, so the output of the Nant gate 6 is at a high level and is applied to the gate of the triac T1, so that the triac T1 becomes conductive and passes the alternating current of the commercial power supply. on the other hand,
The gate of the triac T2 is at a low level due to the output of the comparator 5, and the triac T2 is in a cut-off state.

When the voltage at the (-) terminal drops due to a power outage or the voltage of the commercial power supply drops, the output of comparator 5 becomes high level,
The tritic T1 is in a cutoff state, the triac T2 is in a conductive state, and the AC output of the inverter 4 is supplied to various devices.

[Problem to be solved by the invention 3 The conventional device described above uses a large-capacity inverter, making the device large and expensive, and failures such as triacs affect the full load device. There is a problem.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the uninterruptible power supply device of the present invention.

In the figure, 1 is a rectifier that rectifies the commercial power supply, and 2 is a rectifier that converts the output voltage of the rectifier 1 to a voltage slightly lower than that of the storage battery 3.
DI and D2 are diodes inserted into the rectifier l and the output of the storage battery.

[Effect]

In normal times, commercial power is converted into direct current by the rectifier 1 and supplied to the load via the diode DI. The output of the rectifier 1 is converted by a small DC-DC converter 2 to a voltage slightly lower than the output voltage of the rectifier 1, and the storage battery 3 is charged.
Diode D2 prevents the output of rectifier 1 from going around to the storage battery.

During a power outage, the output of the rectifier 1 disappears, so the output of the storage battery 3 is automatically supplied to the load via the diode D2.

The diode D1 prevents the output of the storage battery 3 from going around to the rectifier side.

In this way, it is possible to realize an uninterrupted power supply device that does not use a large inverter, can be housed in a distributed manner within each device, and is less prone to failure due to its simple configuration.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples.

FIG. 2 is a block diagram of an uninterruptible power supply device according to an embodiment of the present invention. The same reference numerals indicate the same objects throughout the figures.

In the figure, under normal conditions, the commercial power source is converted into DC by a rectifier 1, and is supplied to the load via a diode D1.

Further, the output of the rectifier 1 is converted by a DC-DC converter 2 to a voltage slightly lower than the output voltage, and a storage battery 3 provided in common is charged.

At this time, the output of the rectifier 1 is prevented from going around to the storage battery 3 side by the diode D2.

During a power outage, the output of the storage battery 3 is automatically supplied to the load via the diode D2. At this time, the output of the storage battery 3 is prevented from going around to the rectifier 1 side by the diode D1.

The reason why the charging voltage of the M battery 3 is set slightly lower than the output voltage of the rectifier 1 is because DC is supplied from the commercial power supply to the load circuit only via the rectifier 1 and the diode D1 under normal conditions. This is to prevent direct current from flowing from the diode D2 to the load circuit.
The charging voltage of the storage battery 3 is set to be lower than the output voltage of the rectifier 1 by an amount corresponding to the voltage-current characteristic of No. 2.

Although the storage battery 3 is commonly used, the rectifier 1. DC-OC
Converter 2 and diode [11, D2 are small.

Since it is lightweight and can be mounted on a printed circuit board, it can be housed in each device, allowing power supply to be distributed, and even in the event of a failure, other devices will not be affected, increasing overall reliability.

〔Effect of the invention〕

As explained above, according to the uninterrupted power supply device of the present invention,
It is small and lightweight, and can be housed in a distributed manner in each device, making it economical and highly reliable.

[Brief explanation of drawings]

Fig. 1 is a principle diagram of an uninterrupted power supply device of the present invention, Fig. 2 is a diagram of an uninterrupted power supply device 11172 of an embodiment of the present invention, and Fig. 3 is a block diagram of a conventional uninterrupted tX device. be. In the figure, 1 is a rectifier, 2 is a DC-DC converter, 3 is a storage battery, DI, and 02 are diodes.

Claims (1)

[Claims] A rectifier (1) that rectifies commercial power; a DC-DC converter (2) that converts the output of the rectifier (1); and a DC-DC converter (2) that converts the rectifier output voltage to a storage battery (3) charged at a slightly lower voltage; and a diode (D1) connected to the output of the rectifier (1).
and a diode (D2) connected to the output of the storage battery (3).
), and supplies direct current via a diode (D1) or a diode (D2).