JPH06335179A - Non interrupting power supply apparatus - Google Patents

Abstract

PURPOSE:To facilitate the supply of a constant DC voltage to a load even if an instantaneous open circuit or an abnormal voltage is created in an external commercial power supply. CONSTITUTION:When a switch SW1 is turned on, a switching control means 1 detects that ON-state and, further, monitors the voltage of an external commercial power supply and, if it is normal, outputs an ON-signal and supplies the output of one of a battery 9 and a battery 10 in a battery power supply part 30 to a DC/DC converter 15. When the switching control means 1 receives an alarm signal which shows that the output voltage level of the battery 9 or the battery 10 is abnormal, if the external commercial power supply is normal, supplies the output of a rectifying part 13 to the DC/DC converter 15 and, if the external commercial power supply is also abnormal, outputs a stop signal and makes an auxiliary battery 8 supply a power to the DC/DC converter 15 for a certain period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply,
In particular, it relates to an uninterruptible power supply for supplying DC power to a load such as a computer.

[0002]

2. Description of the Related Art A conventional uninterruptible power supply system is disclosed, for example, in Japanese Utility Model Laid-Open No. 1-146746.
When an external commercial power supply (AC power supply) is input and the power switch is turned on, the external commercial power supply is rectified to direct current,
The output is output to a DC / DC converter and this DC / DC converter
When the output of the DC converter is supplied to the load and the above-mentioned power switch is turned on, and the external power is being supplied normally, the battery provided inside is charged and the external power is cut off. When this occurs, it is detected and output to the above-mentioned DC / DC converter, and this DC / D
Power is supplied to the load via the C converter.

[0003]

In the conventional uninterruptible power supply described above, when the external commercial power supply is in a normal state when the power switch is in the ON state, the external commercial power supply is rectified and used as a load. When power is supplied and the external commercial power supply is cut off, it is switched to the battery power supply to supply power to the load.However, after the external commercial power supply is cut off, there is a finite amount of time before the power supply is restarted by the battery. However, it is unavoidable that the supply voltage to the load fluctuates, although it is a short time, and when a high voltage is superimposed on the external commercial power source due to lightning, etc. When the voltage fluctuates abnormally due to disconnection, the fluctuation causes fluctuations in the operating voltage supplied to the load, such as a computer, and such fluctuations in the operating voltage cause malfunction of the device that is the load. It has the disadvantage say.

An object of the present invention is to make it possible to supply a constant voltage without being affected by an external commercial power supply even if the external commercial power supply becomes an abnormal voltage for a short time due to a cutoff or a lightning strike. An object of the present invention is to provide an uninterruptible power supply device capable of preventing malfunction of a load due to fluctuations in power supply voltage.

[0005]

SUMMARY OF THE INVENTION An uninterruptible power supply of the present invention comprises a power switch for turning on / off an input from an external commercial power source, a spare battery inside and a standby battery when an ON signal is input. Is output to the first output section and the stop signal is input, the output from the spare battery is output to the second output section.
Output to the output section of the battery, and a standby battery supply unit that disconnects the output after a predetermined time has elapsed, a charging section that outputs charging power when the power switch is ON, and an external commercial unit when the power switch is ON. A rectifying unit that inputs a power source and outputs DC power of a predetermined voltage, and a plurality of batteries are provided to operate by the first output when the ON signal is output to monitor the output voltages of the plurality of batteries and to determine a predetermined value. Power of the charging unit is selected and supplied to the battery having a voltage lower than the specified voltage, and the output of the battery having a voltage equal to or higher than a predetermined voltage is selected and output to the outside, and an alarm signal is output when all the batteries are lower than the predetermined voltage. A battery power supply unit for
When power is supplied from the spare battery and the ON state of the power switch is detected, the ON signal is output, and when the voltage of the external commercial power source is less than a predetermined value and the alarm signal is received, the stop signal is output. A switching control unit that outputs a rectified power supply signal when only an alarm signal is received, a switch unit that turns on the output of the rectified power supply when the rectified power supply signal is received, and a second of the backup battery supply means. It comprises a DC / DC converter which receives the output of the output section, the output of the battery power supply means and the output of the switch section and outputs electric power having a predetermined voltage.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the uninterruptible power supply of the present invention.

The uninterruptible power supply system of this embodiment, as shown in FIG. 1, turns on / off an input from an external commercial power supply (AC).
The switch SW1 for F, the switching control unit 1 for monitoring the ON state of the switch SW1 and whether or not the voltage of the external commercial power source is normal, and performing control described later, and the spare battery 8 are built in and controlled by the switching control unit 1. A backup battery supply means 20 for supplying the output of the backup battery 8 to a DC / DC converter 15 to be described later and batteries 9 to 10 are built in, and are controlled by the switching control unit 1 so that the DC / DC converter 15 has a battery during normal operation. And a battery power supply means 30 for supplying electric power from.

In addition, in the uninterruptible power supply device shown in FIG. 1, when the switch SW1 is turned on, the charging unit 2 which rectifies the external commercial power source, converts it into a predetermined voltage, and outputs it, and the switch SW1 is in the on state. At this time, the output of the rectification unit 13 is controlled by the rectification unit 13 that rectifies the external commercial power source and outputs DC power having a predetermined voltage, and the output of the rectification unit 13 is DC / DC.
The switch unit 14 that outputs to the converter 15 and the DC / DC converter 15 that converts the input DC power into DC power having a voltage required by the computer 16 as a load and outputs the DC power to the computer 16 are provided.

The above-mentioned backup battery supply means 20 outputs the backup battery 8 and the output of the backup battery 8 when an ON signal is applied to the backup battery output switch 3 and the monitoring control unit 5 which will be described later and the monitoring control unit 6 which will be described later. An internal switch unit 7 for charging, a charging switch 4 for charging the output of the charging unit 2 by adding the output of the charging unit 2 to the spare battery 8 when receiving the output signal,
The output voltage of the spare battery 8 is monitored, and when the output voltage becomes lower than a predetermined output voltage, the monitor control unit 5 that outputs the above-mentioned output signal to the charging switch 4 and the output of the internal switch unit 7 start the operation and stop signal 100. Is received, the backup battery output switch 3 supplies the output of the backup battery 8 to the DC / DC converter 15 for a predetermined time.

The battery power supply means 30 includes a battery 9
10 to 10 and the output from the internal switch unit 7 is started, the output voltage of the batteries 9 to 10 is monitored, and when the voltage falls below a predetermined voltage, an input selection signal for selecting the corresponding battery is output, An output selection signal for selecting a battery having a voltage equal to or higher than the above-mentioned predetermined voltage in any one of the batteries 9 to 10 is output, and the output voltage of the batteries 9 and 10 is set to any one. Also, when the voltage is less than the above-mentioned predetermined voltage, the monitor control unit 6 that outputs the alarm signal 110 and the battery 9-10 outputs the charging unit 2 to the battery designated by the input selection signal. Input selection switch 11 for supplying the power and the battery specified by the output selection signal are selected, and the power of the battery selected from the batteries 9 or 10 is supplied to the DC / DC converter 15. And a power selection switch 12.

The operation of the uninterruptible power supply system shown in FIG. 1 will be described below. The switching control unit 1 is constantly supplied with power from the spare battery 8 in the spare battery supply unit 20, detects this state when the switch SW1 is turned on, and if the voltage of the external commercial power source is normal, the internal switch unit is detected. The ON signal is output to 7.

When the switch SW1 is turned on, the charging section 2 and the rectification section 13 output a DC voltage having a predetermined voltage level.

When the internal switch section 7 receives the ON signal, it outputs the output of the spare battery 8 to the spare battery output switch 3 and the monitoring control sections 5 and 6.

The monitor control unit 5 monitors the output voltage of the spare battery 8 and outputs the above-mentioned output signal when the voltage is less than the specified voltage (when the voltage is less than the predetermined voltage) to control the charging switch 4. The output of the charging section 2 is supplied to the spare battery 8 to charge the spare battery 8.

When the power from the spare battery 8 is supplied to the monitor control unit 6 via the internal switch unit 7, the monitor control unit 6 starts its operation and monitors the output voltage of the batteries 9 and 10.

When the output voltage of the batteries 9 or 10 is equal to or higher than a specified voltage level, an output selection signal designating one of the predetermined batteries is output to the output selection switch 12.

Therefore, in the normal state, the power is supplied to the DC / DC converter 15 from one of the batteries 9 and 10, and the power is supplied to the computer 16 as a load via the DC / DC converter 15. It will be.

If either of the batteries 9 and 10 is lower than the specified voltage, an input selection signal designating the corresponding battery is applied from the monitor control unit 6 to the input selection switch 11, and the input selection switch 11 is selected. Supplies the output of the charging unit 2 to the designated battery to perform charging.

If the output voltage of the battery (9 or 10) supplying the DC / DC converter 15 is less than the specified voltage, the other battery (the remaining one of 9 or 10) is output. The output selection signal that specifies the
Is output to the output selection switch 12.

At this time, the output selection switch 12 selects the battery designated by the output selection signal, and the DC / D
After connecting to the C converter 15, the connection between the previously selected battery and the DC / DC converter 15 is turned off.

If the output voltage of each of the batteries 9 and 10 is less than the specified voltage, the monitor control unit 6 outputs the alarm signal 110 to the switching control unit 1.

When the switching control unit 1 receives the alarm signal 110, it outputs a rectified power supply signal to the switch unit 14.

Upon receiving the rectified power supply signal, the switch unit 14 outputs the output of the rectifier unit 13 to the DC / DC converter 1.
Output to 5.

If the switching control unit 1 receives the alarm signal and the voltage level of the external commercial power source is less than the specified value, the stop signal 100 is output to the spare battery output switch 3 and the computer 16 as the load.

Upon receiving the stop signal, the backup battery output switch 3 outputs the output of the backup battery 8 output via the internal switch section 7 to the DC / DC converter 15 for a predetermined time.

Therefore, if the computer 16 prepares an internal operation program so as to stop the operation after the stop signal is received and before the power supply from the spare battery 8 is stopped. When the power is cut off,
It is possible to avoid malfunction.

In the above description of the embodiment, the battery power supply means 30 is provided with two batteries 9 and 10. However, if necessary, three or more batteries are provided, and these are controlled by the monitor control means 6. The battery having a normal output voltage is selected, the DC / DC converter 15 is controlled to supply the power, and the battery having a voltage lower than the specified voltage is charged. The input selection switch 11 may be controlled as described above.

Further, although the load is a computer in the embodiment of FIG. 1, it is obvious that the load may malfunction if it is affected by the fluctuation of the voltage of the information processing device or the commercial power source other than the computer. .

[0030]

As described above, the uninterruptible power supply system of the present invention supplies the output of the battery contained in the battery power supply means to the DC / DC converter in the normal operating state, and this DC / DC converter Since power is supplied to the load by the converter, the power supply voltage to be supplied to the load is maintained even when the external commercial power supply is interrupted or the voltage of this commercial power supply becomes abnormal due to lightning or other causes. Since the abnormality does not occur, it has an effect of preventing malfunction of a computer, which is a load, from occurring.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an uninterruptible power supply device of the present invention.

[Explanation of symbols]

 1 Switching Control Section 2 Charging Section 3 Spare Battery Output Switch 4 Charging Switch 5 Monitoring Control Section 6 Monitoring Control Section 7 Internal Switch Section 8 Spare Battery 9 Battery 10 Battery 11 Input Selection Switch 12 Output Selection Switch 13 Rectification Section 14 Switch Section 15 DC / DC converter 20 Spare battery supply means 30 Battery power supply means

Claims (2)

[Claims] 1. ON / OFF of an input from an external commercial power source
ON with a power switch and a spare battery inside
When a signal is input, the backup battery is output to the first output unit, and when a stop signal is input, the output from the backup battery is output to the second output unit, and the output is output after a predetermined time has elapsed. A backup battery supply means for disconnecting, and a charging section for outputting charging power when the power switch is ON,
A rectifying unit that inputs an external commercial power source when the power switch is ON and outputs DC power of a predetermined voltage; and a plurality of batteries that operate by the first output when the ON signal is output, The output voltage of the battery is monitored, and the power of the charging unit is selected and supplied to the battery having a voltage lower than a predetermined voltage, and the output of the battery having a voltage higher than the predetermined voltage is selected and output to the outside, and all batteries have a predetermined voltage Battery power supply unit that outputs an alarm signal when it becomes less than, and outputs the ON signal when the ON state of the power switch is detected when power is supplied by the backup battery, and the voltage of the external commercial power supply is less than a predetermined value. And a switching control that outputs the stop signal when the alarm signal is received and outputs the rectified power supply signal when only the alarm signal is received. And parts, and a switch unit is turned ON output of the rectifier power supply and receiving the rectified power supply signal,
DC / which outputs electric power having a predetermined voltage with the output of the second output section of the auxiliary battery supply section, the output of the battery power supply section and the output of the switch section as input
An uninterruptible power supply comprising a DC converter. 2. The spare battery supply means operates with the spare battery, an internal switch unit that turns on the output of the spare battery when receiving the ON signal, and an output of the internal switch unit to receive the stop signal. Then, the output of the internal switch unit is output to the DC / DC converter and the output is cut off after a predetermined time has passed, and the output of the internal switch operates to monitor the voltage of the auxiliary battery. And a first monitoring control unit that outputs an output signal when the voltage becomes lower than a predetermined voltage,
When the output signal is output, the charging switch is configured to charge the output of the charging unit into the spare battery, and the battery power supply means includes the plurality of batteries and the first battery.
The output voltage of the plurality of batteries is output by outputting an input selection signal for monitoring the output voltages of the plurality of batteries and designating a battery less than a predetermined voltage and outputting an output selection signal for a battery having a voltage higher than the predetermined voltage. Second, which outputs the alarm signal when all are below a predetermined voltage
A monitor control unit, an input selection switch for selectively outputting the output of the charging unit as charging power to the battery specified by the input selection signal, and selecting the battery specified by the output selection signal. The uninterruptible power supply according to claim 1, wherein the uninterruptible power supply comprises an output selection switch for outputting to a DC / DC converter.