CN219496628U

CN219496628U - Zero live wire detects and warning circuit

Info

Publication number: CN219496628U
Application number: CN202223531929.6U
Authority: CN
Inventors: 胡建武; 余必焕; 赵东明
Original assignee: Shenzhen Kstar Technology Co Ltd
Current assignee: Shenzhen Kstar Technology Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-08-08
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses a zero and live wire detection and alarm circuit which comprises an optical coupler U1, a diode D2, a light-emitting diode D3, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2; the pin 4 of the optical coupler U1 is connected with the output end DSP-10, the pin 3 is grounded, the pin 1 is connected with the cathode of the diode D2, the pin 2 is connected with the P1 terminal and the anode of the diode D1, the anode of the diode D2 is connected with the cathode of the diode D1 and one end of the resistor R1, the other end of the resistor R1 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with one end of the capacitor C2 and the PE terminal, the other end of the capacitor C2 is connected with the cathode of the light emitting diode D3, the anode of the light emitting diode is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the P2 terminal. The utility model can judge whether the zero and fire wire connection is correct or not through a simple circuit structure, and ensure the load or personal safety.

Description

Zero live wire detects and warning circuit

Technical Field

The utility model relates to the technical field of zero and fire wire detection, in particular to a zero and fire wire detection and alarm circuit.

Background

At present, the detection modes of the zero and fire wires in the market are various, most of the circuits are complex, a control circuit, a switch, a relay, an optical coupler, a diode, a resistor and the like are needed, the cost of the device is high, one unit is failed, and the whole detection circuit is invalid.

Disclosure of Invention

The utility model mainly aims to provide a zero and fire wire detection and alarm circuit, which aims to judge whether the connection of the zero and fire wires is correct or not through a simple circuit structure and ensure the safety of loads or personnel.

In order to achieve the above objective, the present utility model provides a zero-live wire detection and alarm circuit, which includes an optocoupler U1, a diode D2, a first impedance network and a second impedance network.

The pin 4 of the optocoupler U1 is connected with the output end DSP-10, the pin 3 is grounded, the pin 1 is connected with the cathode of the diode D2, the pin 2 is connected with the P1 terminal and the anode of the diode D1, the anode of the diode D2 is connected with the cathode of the diode D1, the first impedance network is connected in series on the connection path from the cathode of the diode D1 to the PE terminal, and the second impedance network is connected in series on the connection path from the PE terminal to the P2 terminal.

According to a further technical scheme of the utility model, the first impedance network comprises a capacitor C1 or a resistor R1, or comprises the capacitor C1 and the resistor R1 which are connected in series.

According to a further technical scheme of the utility model, the second impedance network comprises a capacitor C2, or comprises a resistor R2, or comprises the capacitor C2 and the resistor R2 which are connected in series.

The utility model further adopts the technical scheme that the LED D3 is also included, the light emitting diode D3 is connected in series to a connection path from the PE terminal to the P2 terminal.

The utility model further adopts the technical scheme that the optical coupler also comprises a resistor R3, wherein the resistor R3 is connected in series between the output end DSP-10 and the pin 4 of the optical coupler U1.

According to a further technical scheme, the photoelectric coupler comprises a resistor R4, wherein the resistor R4 is connected in series between a pin 4 of the photoelectric coupler U1 and a 5V power supply.

The zero and live wire detection and alarm circuit has the beneficial effects that:

1. simple structure, stability, reliability and low cost. The control circuit, the switching tube and the relay are not needed, and the LED circuit consists of a diode, a resistor, a capacitor, an optocoupler and a light-emitting diode;

2. whether the zero line and the fire line are connected reversely or not can be judged through the optical coupling signal, when the reverse direction is detected, the output of the UPS is controlled through the DSP chip, and an alarm can be provided on the LCD screen, so that the load or the personal safety is ensured;

3. when the UPS chip controller has faults, the light emitting diode can remind a user of reverse connection of the zero line and the fire line, multiple protection is provided, and faults of load equipment and personal risks are avoided.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of a preferred embodiment of the zero line and fire line detection and alarm circuit of the present utility model.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1, the present utility model provides a zero-fire wire detection and alarm circuit, and a preferred embodiment of the zero-fire wire detection and alarm circuit includes an optocoupler U1, a diode D2, a light emitting diode D3, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2.

The pin 4 of the optocoupler U1 is connected with the output end DSP-10, the pin 3 is grounded, the pin 1 is connected with the cathode of the diode D2, the pin 2 is connected with the P1 terminal and the anode of the diode D1, the anode of the diode D2 is connected with the cathode of the diode D1 and one end of the resistor R1, the other end of the resistor R1 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with one end of the capacitor C2 and the PE terminal, the other end of the capacitor C2 is connected with the cathode of the light emitting diode D3, the anode of the light emitting diode is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the P2 terminal.

In this embodiment, when the zero line and the live line of the UPS circuit are connected correctly, the DSP-10 at the output end outputs the high-low level periodically alternating, so as to determine that the UPS circuit is connected correctly with zero fire, and the UPS can be turned on or off normally. When the LED D3 is not on, the user can be reminded that the zero and live wires are correctly connected. Specifically, when the zero line and the live line of the UPS circuit are correctly connected, the P1 terminal is connected to the live line, the P2 terminal is connected to the zero line, the PE terminal is grounded, the P2 terminal is equal to the PE terminal in potential, the P2 terminal is short-circuited to the PE terminal through the light emitting diode D3 and the capacitor C2, and the light emitting diode D3 is not bright. The working principle is as follows:

and when the positive half cycle is performed, the P1 terminal is positive, the PE terminal is negative, at the moment, the diode D1 is turned on, the diode D2 is turned off, the optocoupler U1 is turned off, and the output end DSP-10 outputs a high level.

And when the negative half cycle is performed, the P1 terminal is negative, the PE terminal is positive, at the moment, the diode D1 is cut off, the PE terminal is connected to the P1 terminal through the capacitor C1, the resistor R1, the diode D2 and the optocoupler U1, the optocoupler U1 is conducted, and the output end DSP-10 outputs low level.

In this embodiment, when the zero line and the live line of the UPS circuit are connected incorrectly, no matter in the positive half cycle or the negative half cycle, the optocoupler U1 is not turned on, the output end DSP-10 outputs a high level all the time, so that it can be determined that the UPS is connected incorrectly with zero fire, the UPS cannot be turned on to turn off the output, and in addition, the light emitting diode D3 is always on, which also prompts the reverse connection of the UPS zero fire line.

Specifically, when the zero line and the live line of the UPS circuit are connected in error, the P1 terminal is connected with the zero line, the P2 terminal is connected with the live line, the PE terminal is grounded, the potential of the P1 terminal is equal to that of the PE terminal, and the PE terminal is short-circuited through the capacitor C1, the diode D1, the resistor R1, the diode D2, the optocoupler U1 and the diode D1. The working principle is as follows:

and in the positive half cycle, the P2 terminal is positive, the PE terminal is negative, and the light emitting diode D3 is turned on.

At the negative half cycle, the P2 terminal is negative, the PE terminal is positive, and the light emitting diode D3 is turned off at this time, but the light emitting diode D3 is always in a lighted state in visual effect because the power frequency is 50 HZ.

In this embodiment, the level signal output by the output terminal DSP-10 is received by the control circuit of the UPS, and the control circuit performs a corresponding operation according to the level signal. For example, when the level signal indicates a zero line reversal, the control circuit controls the UPS output to turn off and provides an audible and visual alarm.

In this embodiment, the level signal output by the output terminal DSP-10 and the on/off state of the light emitting diode D3 indicate whether the zero/fire line of the UPS circuit is connected correctly, and when the UPS control circuit fails and cannot respond to the level signal output by the output terminal DSP-10, the light emitting diode D3 may also remind whether the zero/fire line is connected reversely, so as to provide multiple protection. In another embodiment, the light emitting diode D3 may be omitted in order to reduce the cost and simplify the circuit.

In the present embodiment, as shown in fig. 1, the light emitting diode D3 is connected in series between the capacitor C2 and the capacitor R2. In another embodiment, the led D3 and the resistor R2 are interchanged, which is still within the scope of the present utility model, and the capacitor C1 and the resistor R1 form a first impedance network, i.e. the first impedance network is connected in series to the connection path from the PE end to the cathode of the diode D1, and the capacitor C2 and the resistor R2 form a second impedance network, i.e. the second impedance network is connected in series to the connection path from the PE end to the P2 end. Those of ordinary skill in the art will appreciate that this is a circuit arrangement that is done to achieve a good technical result. Indeed, in other embodiments, the first impedance network may comprise only the capacitor C1, or only the resistor R1, and the second impedance network may comprise only the capacitor C2, or only the resistor R2.

In this embodiment, capacitive isolation is adopted between the PE terminal and the zero line, so that the connection mode is safer electrically, and the zero ground voltage can be effectively reduced.

As an implementation manner, in this embodiment, the zero-live wire detection and alarm circuit further includes a resistor R3, where the resistor R3 is connected in series between the output terminal DSP-10 and the pin 4 of the optocoupler U1.

As an implementation manner, in this embodiment, the zero-live wire detection and alarm circuit further includes a resistor R4, where the resistor R4 is connected in series between the pin 4 of the optocoupler U1 and the 5V power supply.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the specification and drawings of the present utility model or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. The zero and live wire detection and alarm circuit is characterized by comprising an optical coupler U1, a diode D2, a first impedance network and a second impedance network;

2. The zero fire line detection and alarm circuit of claim 1 wherein the first impedance network comprises a capacitor C1.

3. The zero fire line detection and alarm circuit of claim 1 wherein the first impedance network comprises a resistor R1.

4. The zero line detection and alarm circuit according to claim 1, wherein the first impedance network comprises a capacitor C1 and a resistor R1, and the capacitor C1 is connected in series with the resistor R1.

5. The zero fire line detection and alarm circuit of claim 1 wherein the second impedance network comprises a capacitor C2.

6. The zero fire line detection and alarm circuit of claim 1 wherein the second impedance network comprises a resistor R2.

7. The zero line detection and alarm circuit of claim 1, wherein the second impedance network comprises a capacitor C2 and a resistor R2, and wherein the capacitor C2 is connected in series with the resistor R2.

8. The zero line detection and alarm circuit of claim 1, further comprising a light emitting diode D3, the light emitting diode D3 being connected in series in the connection path of the PE terminal to the P2 terminal.

9. The zero-fire wire detection and alarm circuit according to claim 1, further comprising a resistor R3, wherein the resistor R3 is connected in series between the output terminal DSP-10 and the pin 4 of the optocoupler U1.

10. The zero-fire wire detection and alarm circuit according to claim 1, further comprising a resistor R4, wherein the resistor R4 is connected in series between the pin 4 of the optocoupler U1 and a 5V power supply.