JPH0312034Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a standby operation type uninterruptible power supply device that supplies power to loads such as POS and OA equipment.

“Conventional technology” Conventional standby operation type uninterruptible power supply (hereinafter referred to as UPS)
As shown in FIG. 3, the commercial power supplied to the input terminal 1 is supplied to the output terminal 3 via the switch means 2, and a part of the input commercial power is rectified by the charger 4 and charged to the storage battery. Charge 5.
When a power outage is detected by the power outage detector 6, the detection signal is given to the control circuit 7, which drives the inverter 8 and controls the switch means 2 to turn off and the switch means 9 to turn on. The inverter 8 converts the power of the storage battery 5 into AC and outputs it to the output terminal 3.
supply to.

An on/off operation means 10 is provided for putting the UPS into an operating state or a stopped state, and when a high-level on operation signal is supplied to the control circuit 7, the control circuit 7 is turned on and the switch means 2 is turned on. Then, the switch means 9 is turned off. When the operation signal falls, the control circuit 7 turns off the switch means 2 and 9, and then also comes to a halt state.

``Problems with the conventional technology'' Most of the UPS inverter 8, storage battery 5, switch means (off operation), switch means 9 (on operation), and control circuit 7 operate only during power outages, so they cannot be reliably operated during power outages. In order to maintain the reliability of a UPS, it is necessary to periodically inspect it and perform sufficient maintenance. For this inspection, it is not permitted to cut off the input commercial power and cause a power outage, regardless of the operating status of the load equipment. This is because the UPS may be malfunctioning. Therefore, a person who inspects the power supply, who is different from the operator of the load device, can check that the load device is hardly affected even if the input power is cut off or there is an abnormality in the power supply voltage while the load device is off or even if it is on. Check the voltage at output terminal 3 by turning on and off the commercial power supplied to input terminal 1 during a period (for example, a period when the UPS is not actually in service), and check whether there is any abnormality in the UPS. If there was any abnormality, appropriate measures were taken.

As described above, the conventional apparatus required special personnel for inspection and was inconvenient because the inspection time was limited.

The purpose of this invention is to eliminate these drawbacks by automating the inspection work of the device and eliminating the need for special inspection personnel.

"Means for Solving the Problem" According to this invention, a pseudo power outage detection signal is generated for a short period of time △ ₁ by detecting at least either the rising edge or the falling edge of the operating signal from the on/off operating means. The UPS is provided with a pseudo power outage detection signal generating means for operating the inverter, and an alarm means for comparing the output voltage of the inverter with an allowable upper limit value and a lower limit value and issuing an alarm if the output voltage is outside the allowable range. With this configuration, a power outage state occurs at least for a short time △ ₁ after either the rising edge or the falling edge of the operation signal,
Automatic inspection is performed.

"Embodiment" An embodiment of this invention will be described with reference to FIGS. 1 and 2. Portions corresponding to those in FIG. 3 are given the same reference numerals, and redundant explanation will be omitted.

For example, the on/off operation means 10 is operated by the operator of the load device, the operation signal (A in FIG. 2) is given to the pseudo power failure detection signal generation means 11, and a short period of time after the rise or fall of the operation signal is △ ₁ (for example, for several seconds), a pseudo power outage detection signal (FIG. 2B) is generated. That is, the operation signal is applied to the on-delay circuit 11b via the switch 11a, and the rising edge of the signal is delayed by a slight time (for example, about ₁ second) and then applied to the rising edge detection circuit 11c, and the detection signal is applied to the OR gate 11d. The timer circuit 11e generates a pseudo power outage detection signal for a short period of time _Δ1 . On the other hand, the operation signal is given to the fall detection circuit 11g via the switch 11f, the fall of the signal is detected, and the detection signal is transmitted to the OR gate 11.
d to the timer circuit 11e, and as before, a pseudo power outage detection signal is generated for the time _Δ1 . Switches 11a and 11f are initial setting switches for selecting generation of the pseudo power failure detection signal at the rising edge or falling edge of the operation signal, or at both times. The on-delay circuit 11b will be described later.

An OR gate 12 is provided between the power outage detector 6 and the control circuit 7, the power outage detector 6 is connected to one input terminal of the OR gate 12, and the pseudo power outage detection signal generating means 11 is connected to the other input terminal of the OR gate 12. The output of is given to the control circuit 7.

An operation signal adjustment means 13 is provided between the on/off operation means 10 and the control circuit 7, if necessary.
When the switch 13a of the same means 13 is switched to the side a in the figure, the input operation signal is given as is to the control circuit 7, and when the switch 13a is switched to the side b in the figure, the operation signal is passed through the off-delay circuit 13b so that the falling edge of the signal is delayed. The signal is delayed by _Δ2 and is applied to the control circuit 7 (FIG. 2c). This time △ ₂ is the timer circuit 11
The duration of e is selected to be slightly larger than △ ₁ (to be precise, slightly larger than △ ₀ + △ ₁ ). switch 1
3a is an initial setting switch, which is used when the pseudo power outage detection signal is generated only in response to the rising edge of the operation signal (that is, when the switch 11a is on and the switch 11f is
is set to the a side in the figure, and the on operation signal is immediately given to the control circuit 7, and the UPS
is activated. In other words, switch means 2, 9
are controlled to be on and off, respectively, and commercial power is applied to the output terminal 3 (FIG. 2D). When the pseudo power outage detection signal is generated in response to the falling time of the operation signal or both the rising and falling times (that is, when the switches 11a and 11f are set to off and on, respectively, or both are set to on) In this case, the switch 13a is set to the b side in the figure. Therefore, as soon as the operation signal rises, the UPS becomes operational, but when the input operation signal falls,
The output of the off-delay circuit does not fall immediately and takes time△
It falls with a delay of ₂ . Therefore, the UPS is also brought to a halt state with a delay of time △ ₂ . Since the time △ ₂ is set slightly larger than the duration △ ₁ of the pseudo power failure detection signal, the UPS can be automatically inspected within the time △ ₂ . Note that the switch 13a may be omitted and an off-delay circuit may be always inserted.

The reason why the on-delay circuit 11b is provided in the pseudo power outage detection signal generation circuit 11 to delay the generation of the pseudo power outage detection signal by △ ₀ is that before the pseudo power outage state is created, the UPS is activated by the operation signal and the output terminal is This is to give time until commercial power is supplied. △ at the rise of the timer circuit 11e
It is also possible to omit the on-delay circuit 11b by providing a _zero time (in the case of the dotted line in FIG. 2B).

The output of the inverter 8 is given to the alarm means 14, and compared with the permissible lower limit value V and upper limit value Vh of the voltage amplitude by comparators 14a and 14b, respectively.
A signal having a higher level than either one of the signals a and 14b is applied to the alarm device 14d via the OR gate 14c, and an alarm is issued. The operator of the on/off operation means 10 (for example, the operator of the load device) becomes aware of the abnormality in the UPS, contacts the power supply manager, and takes appropriate measures.

As mentioned above, a pseudo power outage condition is created for a short time after the operation signal rises or falls, and automatic inspection is performed. Since the device is not performing operations that would cause trouble if the input power supply is cut off or abnormal, such as during arithmetic processing or information service, the load device will not be affected. It is easier to detect abnormalities in the UPS when automatic inspection is performed under load rather than under no load.
It is desirable that the operator of the on/off operation means (for example, the operator of the load device) keep the load device in the ON state for a short time after the operation.

In the above description, the pseudo power outage detection signal generating means 11
Although it has been explained that the output of the output is supplied to the control circuit 7 via the OR gate 12, it is also possible to remove the OR gate 12 and directly control the power outage detector 6 with the pseudo power outage detection signal to generate the detection signal. Yes (indicated by the dotted line in Figure 1).

"Effects of the invention" As described above, according to this invention, a pseudo power outage state is automatically created in a short period of time immediately after the UPS operator operates the on/off operation means, and the output voltage of the inverter is checked. If there is any abnormality, an alarm will be issued. Therefore, unlike the conventional method, special personnel are not required for inspection, which significantly contributes to labor saving.

Conventionally, the time for carrying out an inspection was controlled by the load device, which was inconvenient, but this invention automatically eliminates this inconvenience.

[Brief explanation of drawings]

Fig. 1 is a block system diagram showing an embodiment of this invention, Fig. 2 is an operation waveform diagram to explain the operation of Fig. 1, and Fig. 3 is a block system diagram of a conventional standby operation type uninterruptible power supply. It is. 1: Input terminal, 2, 9: Switch means, 3: Output terminal, 4: Charger, 5: Storage battery, 6: Power failure detector, 7: Control circuit, 8: Inverter, 10: On/off operation means, 11: Pseudo Power failure detection signal generation means, 12: OR gate, 13: Operation signal adjustment means, 14: Alarm means.

Claims (1)

[Claim for Utility Model Registration] Normally, commercial power is supplied to the output terminal, and when a power outage is detected, the power from the storage battery is converted to alternating current by an inverter and supplied to the output terminal, and the operation signal of the on/off operation means is controlled. In a standby operation type uninterruptible power supply that is supplied to a circuit and placed in an operating state or a stopped state, a pseudo power outage detection signal is activated for a short period of △ ₁ hour by detecting at least one of the rising or falling edges of the above operation signal. a pseudo power outage detection signal generating means for generating a pseudo power failure detection signal and operating the inverter; and an alarm means for comparing the output voltage of the inverter with an allowable upper limit value and a lower limit value and issuing an alarm when the output voltage is outside the allowable range. A standby operation type uninterruptible power supply device characterized by: