Circuit with ground wire live-line flickering alarm function

Abstract

The utility model relates to a circuit with ground wire live-line flicker alarm, a voltage division voltage sampling module is arranged between a zero line and a ground wire of a power supply input end of the circuit, the voltage division voltage sampling module comprises a capacitor C1, a resistor R1 and a resistor R2, the capacitor C1 and the resistor R1 are connected in series, the resistor R2 is connected in series, one end of the resistor R1 is connected with the ground wire, and the other end of the resistor R2 is connected with the ground wire. One end of the resistor R2 is connected with a zero line, the other end of the resistor R2 is sequentially connected with a diode D1 and a capacitor C2, the two ends of the capacitor C2 are connected with a luminous body in parallel, the luminous body is connected with a resistor R3 and a bidirectional trigger tube DB1 in series, the positive electrode of the diode D1 is connected with the resistor R2, and the negative electrode of the diode D1 is connected with the capacitor C2; the luminous body continuously flickers when abnormal voltage exists, the higher the abnormal voltage is, the faster the luminous body flickers, meanwhile, the leakage protector cuts off power supply of the load, but the luminous body continuously prompts until abnormal power supply is eliminated, the prompt is enough to prompt a user, and the purposes of warning and protection are achieved more quickly.

Description

Technical Field

[0001] The utility model relates to a circuit with a ground wire leakage indication alarm, in particular to a circuit with a ground wire live flashing alarm. Background Art

[0002] In existing circuit protectors, a detection circuit is set between the ground wire and the neutral wire at the power input end. When there is abnormal voltage between the ground wire and the neutral wire, an indicator light will be triggered. The existing indicator light is of the continuously lit type, even if the ground wire voltage is abnormal and not sufficient to give an effective prompt. Utility Model Content

[0003] The utility model aims to provide a circuit with a ground wire live flashing alarm, which solves the problem that the existing indicator light reminder is not eye-catching enough.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The utility model provides a circuit with a ground wire live flashing alarm, wherein a tripping coil is arranged on a live wire and a neutral wire of a power input end of the circuit, the input end of the tripping coil is also connected to an output end of a solid-state relay, the input end of the solid-state relay is connected to a control electrode of a thyristor SCR1, and the control electrode of the thyristor SCR1 is also connected to a leakage protection module, and is characterized in that a voltage-dividing voltage sampling module is arranged between the neutral wire and the ground wire of the power input end of the circuit, the voltage-dividing voltage sampling module comprises a capacitor C1, a resistor R1 and a resistor R2, the capacitor C1 and the resistor R1 are arranged in series and the resistor R2 is arranged in series, one end of the resistor R1 is connected to the ground wire, one end of the resistor R2 is connected to the neutral wire, and the other end is connected to a diode D1 and a capacitor C2 in sequence, a light-emitting body is connected in parallel at both ends of the capacitor C2, the light-emitting body is connected in series with a resistor R3 and a bidirectional trigger tube DB1, the positive electrode of the diode D1 is connected to the resistor R2, and the negative electrode is connected to the capacitor C2.

[0006] Furthermore, the light-emitting body is a light-emitting diode, the cathode of the light-emitting diode is connected to the resistor R3, and the anode is connected to the bidirectional trigger tube DB1.

[0007] Furthermore, the contact point where the resistor R2 is connected to the neutral line is arranged before the contact point of the tripping coil.

[0008] Furthermore, the contact point connecting the resistor R3 and the neutral line is arranged behind the contact point of the tripping coil.

[0009] Furthermore, the other end of the resistor R3 is connected to the input end of the optical coupler U1, and the output end of the optical coupler U1 is connected to the control electrode of the thyristor SCR1.

[0010] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0011] The utility model has a circuit with a ground wire live flashing alarm, and a voltage-dividing voltage sampling module is arranged between the neutral wire and the ground wire of the power input end. The light-emitting body therein will flash continuously when there is an abnormal voltage, and the higher the abnormal voltage is, the faster the light-emitting body flashes. At the same time, the leakage protector cuts off the power supply to the load, but the light-emitting body will continue to prompt until the abnormal power supply is eliminated. The prompt is sufficient to remind the user and achieve the purpose of warning and protection more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0013] Figure 1 It is a circuit diagram of Embodiment 1 of the utility model;

[0014] Figure 2 This is a circuit diagram of Embodiment 2 of the present utility model

[0015] Figure 3 This is a circuit diagram of Embodiment 3 of the present utility model;

[0016] Figure 4 It is a circuit diagram of Example 4 of the utility model.

[0017] The reference numerals are described as follows:

[0018] 1. Power input terminal; 2. Trip coil; 3. Solid-state relay; 4. Optocoupler U1

[0019] 5. Voltage division voltage sampling module; 6. Leakage protection module. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Example 1 Figure 1 As shown, it includes a power input terminal 1, a divided voltage sampling module 5 and a leakage protection module 6.

[0024] A trip coil 2 is arranged on the live wire and the neutral wire of the power input terminal 1 of the circuit, the input terminal of the trip coil is also connected to the output terminal of the solid-state relay 3, the input terminal of the solid-state relay 3 is connected to the control electrode of the thyristor SCR1, and the input terminal of the trip coil 2 is connected to the output terminal of the solid-state relay 3; the solid-state relay 3 is used to control the action of the trip coil 2, and the leakage protection module 6 is also connected to the control electrode of the thyristor SCR1. Under normal conditions, the trip coil 2 works normally and the power supply supplies power to the load normally. When leakage occurs, the leakage protection module 6 will quickly feedback to the control electrode of the thyristor SCR1 to turn it on, and the control electrode of the thyristor SCR1 will transmit information to the solid-state relay 3, and the output terminal of the solid-state relay 3 will output a signal, so that the trip coil 2 is tripped and disconnected, so that the power supply no longer supplies power to the load.

[0025] A voltage-dividing sampling module 5 is provided between the neutral line and the ground line of the power input terminal 1 of the circuit. The voltage-dividing module includes a capacitor C1, a resistor R1 and a resistor R2. The capacitor C1, the resistor R1 and the resistor R2 are connected in series. One end of the resistor R1 is connected to the ground line, one end of the resistor R2 is connected to the neutral line, and the other end is connected to a diode D1 and a capacitor C2 in sequence. A light-emitting body is connected in parallel at both ends of the capacitor C2. The light-emitting body is connected in series with a resistor R3 and a bidirectional trigger tube DB1. The positive electrode of the diode D1 is connected to the resistor R2, and the negative electrode is connected to the capacitor C2. The other end of the resistor R3 is connected to the input end of the optical coupler U14. The input end of the optical coupler is also connected to the neutral line. The output end of the optical coupler U14 is connected to the control electrode of the thyristor SCR1. In this example, the light-emitting body is a light-emitting diode, and the negative electrode of the light-emitting diode is connected to the resistor R3, and the positive electrode is connected to the bidirectional trigger tube DB1. The resistor R3 is a current-limiting resistor. The larger the capacitance of the capacitor C2, the brighter the light-emitting body and the slower the flickering.

[0026] When there is an abnormal voltage between the neutral line and the ground line of the power input terminal 1, the voltage divided by the resistor R2 is filtered through D1 to the capacitor C2. When the voltage at the capacitor C2 terminal reaches 30V, the bidirectional trigger tube DB1 is turned on, and the voltage at the C2 terminal is discharged to the neutral line through the bidirectional trigger tube DB1, the light-emitting body, R3, and U1. The light-emitting body is lit, and the optical coupler U14 is turned on. At this time, the voltage at the C2 terminal is lower than the DB1 conduction voltage, the bidirectional trigger tube DB1 is turned off, the light-emitting body is extinguished, and U1 is turned off. However, when the abnormal voltage between the neutral line and the live line continues, LED1 will repeatedly light up and extinguish in this cycle; and the higher the voltage between them, the faster the bidirectional trigger tube DB1 is turned on, and the faster LED1 will flash repeatedly.

[0027] In the above process, if the optocoupler U14 is turned on and the working voltage is connected to the optocoupler U14, the output end of the optocoupler U14 will output the working voltage to the SCR1 thyristor control electrode. After the thyristor SCR1 is turned on, the fixed relay will cause the release L1 to be energized to achieve forced power off.

[0028] In this example, the contact point where the resistor R2 and the neutral line are connected is arranged before the contact point of the trip coil 2, so that if the power input terminal 1 no longer supplies power to the load after power failure, the voltage-dividing voltage sampling circuit can still perform detection.

[0029] Embodiment 2, as Figure 2 As shown, the remaining structures of this embodiment are the same as those of the first embodiment, except that the contact of the tripping coil 2 is also provided on the ground wire.

[0030] Embodiment 3, as Figure 3 As shown, in this example, no optical coupler module is provided, so when there is an abnormal voltage between the neutral line and the ground line, the power supply may still supply power to the load. And when leakage protection occurs, the embodiment of the utility model can still detect whether there is power on.

[0031] Embodiment 4, as Figure 4 As shown, in this example, the optocoupler module is not provided and the contact point connected to the resistor R4 and the neutral line is provided after the contact point of the trip coil 2. Thus, when an abnormal voltage exists between the neutral line and the ground line, the power supply may still supply power to the load, but when leakage protection occurs, it is difficult to detect in the embodiment of the utility model.

[0032] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit with a ground wire live flashing alarm, wherein a trip coil is provided on the live wire and the neutral wire of the power input end of the circuit, the input end of the trip coil is also connected to the output end of the solid-state relay, the input end of the solid-state relay is connected to the control electrode of the thyristor SCR1, and the control electrode of the thyristor SCR1 is also connected to the leakage protection module, characterized in that: A voltage-dividing voltage sampling module is provided between the neutral line and the ground line of the power input end of the circuit, and the voltage-dividing voltage sampling module includes a capacitor C1, a resistor R1 and a resistor R2. The capacitor C1 and the resistor R1 are connected in series and the resistor R2 is connected in series. One end of the resistor R1 is connected to the ground line, one end of the resistor R2 is connected to the neutral line, and the other end is connected to a diode D1 and a capacitor C2 in sequence. A light-emitting body is connected in parallel at both ends of the capacitor C2, and the light-emitting body is connected in series with a resistor R3 and a bidirectional trigger tube DB1. The positive electrode of the diode D1 is connected to the resistor R2, and the negative electrode is connected to the capacitor C2.

2. A circuit with ground wire live flashing alarm according to claim 1, wherein: The light emitting body is a light emitting diode, the cathode of the light emitting diode is connected to the resistor R3, and the anode of the light emitting diode is connected to the bidirectional trigger tube DB1.

3. A circuit with ground wire live flashing alarm according to claim 1, wherein: The resistor R2 and the contact point connected to the neutral line are arranged before the contact point of the tripping coil.

4. A circuit with ground wire live flashing alarm according to claim 1, wherein: The resistor R2 and the contact point connected to the neutral line are arranged after the contact point of the tripping coil.

5. A circuit with ground wire live flashing alarm according to claim 1, wherein: The other end of the resistor R3 is connected to the input end of the optical coupler U1 , and the output end of the optical coupler U1 is connected to the control electrode of the thyristor SCR1 .

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