CN105281418A - Power-off preventive device of portable electric energy quality monitor - Google Patents

Abstract

The invention discloses a power-off preventive device of a portable electric energy quality monitor. The device can prevent the portable electric energy quality monitor from power off during long-term test, the power-off possibility of the monitor is reduced, the using reliability of the monitor is improved, and the efficiency of electric energy quality test is improved.

Description

A portable power quality monitoring instrument anti-power outage device

technical field

The invention relates to the field of electric energy technology, and more specifically relates to a device for preventing power failure of a portable power quality monitoring instrument.

Background technique

When using a portable power quality monitoring instrument for long-term power quality testing, the monitoring instrument needs to provide a stable power supply for a long time. During the test process, the monitoring instrument cannot work normally after a long period of power failure, resulting in loss of test data, resulting in untimely test work. Finish. Therefore, it is necessary to provide a device for preventing power failure of a portable power quality monitoring instrument.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is to solve the problem that the power supply of the monitoring instrument is cut off when the power quality monitoring instrument is tested for a long time, and to provide a device for preventing power failure of the portable power quality monitoring instrument.

(2) Technical solution

In order to solve the above technical problems, the present invention provides a power outage prevention device for a portable power quality monitoring instrument, which device includes: voltage signal acquisition line 2, voltage sensor 3, logic AND gate 5, timer 7, logic NOT gate 9. Relay 11, relay 19, 220V AC power supply 14, spare 220V AC power supply 15, power adapter 16, wire 12, wire 13, wire 17, wire 20, signal wire 4, signal wire 6, signal wire 8, signal wire 10 , signal wire 18 and signal wire 21.

Wherein, the 220V AC power supply 14 is connected with the relay 19 through the wire 20, the power adapter 16 is connected with the relay 19 through the wire 12, supplies power to the power quality monitoring instrument 1 through the wire 17, and connects the wire 13 of the relay 11 with the spare 220V AC power supply 15 and the wire 12 connections.

(3) Beneficial effects

The invention provides an anti-power outage device for the portable power quality monitoring instrument during long-term testing, reduces the probability of power outage of the power supply of the monitoring instrument, and improves the reliability of the instrument and the efficiency of power quality testing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of the power outage prevention device of the present invention;

Marks in the figure: 1. Power quality monitoring instrument, 2. Voltage signal acquisition line, 3. Voltage sensor, 4. Signal wire, 5. Logic AND gate, 6. Signal wire, 7. Timer, 8. Signal wire, 9. Logic NOT gate, 10, signal wire, 11, relay, 12, wire, 13, wire, 14, 220V AC power supply, 15, spare 220V AC power supply, 16, power adapter, 17, wire, 18, signal wire, 19, Relay, 20, wire, 21, signal wire.

detailed description

Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

The anti-power outage device of the portable power quality monitoring instrument of the present invention, as shown in the accompanying drawings, includes a voltage signal acquisition line 2, a voltage sensor 3, a logic AND gate 5, a timer 7, a logic NOT gate 9, a relay 11, and a relay 19 , 220V AC power supply 14, spare 220V AC power supply 15, power adapter 16, wire 12, wire 13, wire 17, wire 20, signal wire 4, signal wire 6, signal wire 8 and signal wire 10.

The 220V AC power supply 14 is connected to the relay 19 via the wire 20, the power adapter 16 is connected to the relay 19 via the wire 12, and supplies power to the power quality monitoring instrument 1 via the wire 17, and the wire 13 connected to the relay 11 is connected to the backup 220V AC power supply 15 and the wire 12 .

The working logic of the anti-power outage device of the present invention is as follows:

First: under normal circumstances, the relay 19 is closed, the sensor 3 receives the voltage signal input by the voltage signal acquisition line 2, outputs a high-level signal, and then inputs it to the logic AND gate 5 through the signal wire 4, and the initial output of the timer 7 is a high voltage Therefore, the output of the logic AND gate 5 is a high-level signal. On the one hand, this signal is input to the relay 19 through the signal wire 21, and the relay 19 remains closed under the action of the high-level signal. On the other hand, the high-level signal is passed through The signal wire 18 is input to the logic NOT gate 9, and the logic NOT gate 9 outputs a low-level signal to the relay 11 through the signal wire 10, and the relay 11 keeps the disconnected state under the action of the low level.

Second: when the 220V AC power supply 14 is powered off due to a fault, the sensor 3 receives the voltage signal input by the voltage signal acquisition line 2, outputs a low-level signal, and then inputs it to the logic AND gate 5 through the signal wire 4, and the output of the logic AND gate 5 It is a low-level signal instantaneously. This signal is input to the relay 19 through the signal wire 21 on the one hand, and the relay 19 is disconnected under the action of the low-level signal. On the other hand, the low level is input to the logic NOT gate 9 through the signal wire 18. Inverter 9 outputs a high-level signal to relay 11 through signal wire 10, and relay 11 is quickly closed under the action of high level, thereby putting into standby 220V AC power supply to ensure the normal operation of the monitoring instrument.

The third: regularly check whether the 220V AC power supply 14 is restored to power supply. At the moment when the 220V AC power supply 14 is powered off, because the logic AND gate 5 outputs a low level signal to the timer 7, the timer 7 outputs a low level and starts timing. Timer 7 outputs a high level signal. At this time, the logic AND gate 5 outputs a high-level signal, the relay 11 is disconnected, and the relay 19 is closed at the same time. If the 220V AC power supply 14 resumes power supply, repeat the first step, and if the 220V AC power supply 14 is still recovering power supply, then repeat the second step. , the third step.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all should cover Within the scope of the claims of the present invention.

Claims (2)

1. the anti-power supply breaker device of a portable electric energy quality-monitoring instrument, it is characterized in that, this device comprises: voltage signal acquisition line (2), voltage sensor (3), logical AND gate (5), timer (7), logic inverter (9), relay (11), relay (19), 220V AC power (14), 220V AC power (15) for subsequent use, power supply adaptor (16), wire (12), wire (13), wire (17), wire (20), signal conductor (4), signal conductor (6), signal conductor (8), signal conductor (10), signal conductor (18) and signal conductor (21).

2. the anti-power supply breaker device of portable electric energy quality-monitoring instrument according to claim 1, it is characterized in that, described 220V AC power (14) is connected with relay (19) through wire (20), described power supply adaptor (16) is connected with relay (19) through wire (12), through wire (17) to electric energy quality monitor device (1) power supply, the wire (13) connecting relay (11) is connected with 220V AC power (15) for subsequent use and wire (12).