Patent ID: 12206233

Reference numerals inFIGS.1to13include:

01—drive module,02—switch module,1—upper shell,2—lower shell,3—pin,4—control circuit board,5—cable connector,6—conductive output piece,7—button,8—fixed Column,9—groove,10—card position,11—rib ring,12—connection groove,13—waterproof gasket,14—fixed seat,15—key hole,16—U-shaped elastic ring,17—via hole,18—limit ring,19—limit groove,20—sealing rib,21—circle,23—breaker,24—breaker bracket,25—connector,26—connection reset,27—key reset,28—fixed contact,29—control arm,30—drive slot,31—card slot,32—through slot,33—limiting bump.

DETAILED DESCRIPTION

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the embodiments and the accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment 1

A leakage current detection circuit provided in this embodiment, as shown inFIG.1, includes an input terminal L, an input terminal N, an output terminal LO and an output terminal NO, and also includes a main switch S, a drive module01, a switch module02and a circuit breaker23, the drive module01is provided with an S1sensing terminal and an S2sensing terminal, and the S1sensing terminal is signal-connected with the S2sensing terminal; the input terminal L is connected to the output terminal LO through the main switch S, and the input terminal N is connected to the output terminal NO through the main switch S; the input end of the drive module01is connected to the output terminal LO, and the output end of the drive module01is connected to the control end of the switch module02. The drive module01is used to control the switch module according to the signal of whether the S1sensing end and the S2sensing end are connected.02on and off; the input end of the switch module02is connected to the output terminal LO, the output end of the switch module02is connected to a voltage end of the circuit breaker23, the other voltage end of the circuit breaker23is connected to the output terminal NO and the circuit breaker. The control terminal of23is connected with the control terminal of the main switch S and is used to control the on and off of the main switch S.

Specifically, as shown inFIG.1, this embodiment does not need to use an inductive device such as a transformer, but sets the S1inductive end and the S2inductive end for signal connection. The terminal is connected to the S2sensing terminal. Since the leakage current detection circuit of this embodiment can be optionally applied to the plug and socket, the output of the plug is generally a cable, so in the long-term use process, the cable may be broken and other problems may lead to leakage current Therefore, the above-mentioned induction connection line can be set in the cable, and the length can be set according to the cable, which is not limited in this embodiment. If the connection line is broken, the S1sensing end and the S2sensing end are disconnected, which means that the wire used for current and voltage transmission in the cable may also be disconnected, so the signal between the S1sensing end and the S2sensing end can be passed. Connect or disconnect to determine whether leakage current is generated, and then control the on and off of the switch module02through the drive module01, and then control the circuit breaker23to work, generate a circuit breaker signal to disconnect the main switch S, thereby turning off the output voltage and ensuring the use of electrical safety.

The specific circuit schematic diagram of this embodiment is shown inFIG.2, the switch module02includes a switch tube Q1and a switch tube Q2; a switch end of the switch tube Q1is connected to a voltage end of the circuit breaker23, and the other end of the switch tube Q1A switch terminal is connected to the output terminal LO, the control terminal of the switch tube Q1is connected to the output terminal of the drive module01; a switch terminal of the switch tube Q2is connected to a voltage terminal of the circuit breaker23, and the other switch terminal of the switch tube Q2is connected to the output terminal LO is connected, and the control end of the switch tube Q2is connected to the output end of the driving module01. Among them, the switch tube Q1and the switch tube Q2are preferably thyristors, and the connection mode of the cathode, the anode and the control terminal of the switch tube Q1and the switch tube Q2is shown inFIG.2.

The driving module01of this embodiment includes a switch tube Q3, a resistor R5, a resistor R7, a resistor R9, a resistor R11, a resistor R10, a diode D7and a diode D6, and is also provided with corresponding auxiliary devices, such as a capacitor C3, a Zener diode ZD1resistor R12, resistor R8, diode D2, diode D3, etc. The specific connection method is shown inFIG.2; one end of the resistor R7is connected to the output terminal Q3LO through the diode D6, and the other end of the resistor R7is connected to the switch tube Q3through the resistor R9. One switch terminal of the switch tube is connected to the control terminal of the switch module02, the other switch terminal of the switch tube Q3is connected to the output terminal NO through the diode D7and the resistor R11in turn, and the two ends of the resistor R5are respectively connected to the output terminal NO. A voltage end of the circuit breaker23is connected to the other switch end of the switch tube Q3; the S1sensing end is connected to one end of the resistor R7through the resistor R10, and the S2sensing end is connected to the cathode of the diode D7.

Specifically, the working principle of this embodiment is:

When the S1sensing terminal and the S2sensing terminal are normally connected, the output terminal LO and the output terminal NO output voltage signal normally.

When the connection between the S1sensing terminal and the S2sensing terminal is disconnected, it means that leakage current may be generated. At this time, the circuit where the resistor R5, the resistor R7, the resistor R9, the resistor R11, and the diode D7are located makes the switch tube Q3turn on. The switch tube Q3makes the switch tube Q1and the switch tube Q2turn on, and then causes the two voltage terminals of the circuit breaker23to generate a pressure difference signal, and the circuit breaker23generates a magnetic adsorption main switch S, so that the main switch S is tripped, that is, the circuit breaker23is disconnected. Open the connection between the input terminal L and the output terminal LO, the input terminal N and the output terminal NO, thereby disconnecting the voltage output of the line and ensuring the safety of the line and electricity.

When the inductive connection line between the S1inductive end and the S2inductive end generates an electrical connection signal with the live wire cable and the neutral wire cable where the input terminal L and the input terminal N are located, that is, in this embodiment, the input terminal L and the input terminal N are connected. The outer periphery of the live wire cable and the neutral wire cable is wrapped with a conductive layer, such as a conductive layer made of graphene, and the conductive layer is connected with the signal of the sensing wire, resulting in a short-circuit signal between the live wire and/or the neutral wire and the conductive layer, and then the live wire and/or the neutral wire will generate a short-circuit signal with the sensing connection wire. At this time, the resistor R5, resistor R7, resistor R9, resistor R11, and diode D7are located. The circuit turns on the switch tube Q3, and the turned on switch tube Q3makes both the switch tube Q1and the switch tube Q2turn on, so it can also control the circuit breaker23to generate a pressure difference and drive the main switch S to trip to ensure electricity safety.

The drive module01is provided with a diode D10and a resistor R3. When the live wire breaks and the conductive layer generates a short-circuit signal, and then generates a short-circuit signal with the induction connection line, the switch tube Q2is turned on through the diode D10and the resistor R3, thereby making the circuit open. A voltage difference is generated across the two ends of the device23, and the main switch S is controlled to be disconnected to cut off the voltage output.

Furthermore, the present embodiment is also provided with a switch S3for testing whether the circuit leakage current detection function is normal. As shown inFIG.2, pressing the switch S3can simulate the output of the control signal from the drive module01to control the switch tube Q1and the switch tube. Q2is turned on, so as to detect whether the main switch S will trip, so as to detect whether the leakage current detection and power-off functions of this embodiment are normal.

Embodiment 2

As shown inFIG.3, which is a specific circuit schematic diagram of this embodiment, the input terminal N is connected to a rectifier D1through the main switch S. The driving module01of this embodiment includes a resistor R15, a resistor R18, a resistor R14and a resistor R17. The switch module02includes a diode SCR1and a diode SCR2, the anode of the diode SCR1is connected to the output of the rectifier D1, the cathode of the diode SCR1is grounded, the control end of the diode SCR1is connected to the output end of the drive module01, the anode of the diode SCR2is connected to the output of the rectifier D1, the cathode of the diode SCR2is grounded, and the control end of the diode SCR2is connected to the output end of the drive module01; the output of the rectifier D1is connected to the control end of the diode SCR1after passing through the resistor R18and the resistor R15in turn, and the end of the resistor R18and the resistor R15is connected to the S1. The sensing terminal is connected; the control terminal of the diode SCR2is grounded through the resistor R14and the resistor R17in turn, and the connection terminal of the resistor R14and the resistor R17is connected to the S2sensing terminal. The specific connection method is shown inFIG.3. The S1sensing terminal and the inductive end of S2is also connected through an inductive connection line, and the difference from the first embodiment is the circuit connection mode of the drive module01and the switch module02.

The specific working principle of this embodiment is as follows:

When the S1sensing terminal and the S2sensing terminal are connected normally, the output voltage is normally provided.

When the connection between the S1inductive terminal and the S2inductive terminal is disconnected, the diode SCR1is turned on by the voltage division of the resistor R18and the resistor R17, at this time, a voltage difference is generated between the two ends of the circuit breaker23, and then the main switch S is controlled to trip and cut off the voltage output.

When the live wire or the neutral wire and the conductive layer generate a short-circuit signal, the live wire or the neutral wire also generates a short-circuit signal with the induction connection wire. At this time, the voltage is divided by the resistor R14and the resistor R17, so that the diode SCR2is turned on, so that the circuit breaker23. There is a pressure difference between the two ends of the switch, which controls the main switch S to trip, cuts off the voltage output, and ensures the safety of the line.

Further, the present embodiment is also provided with a switch S4for testing whether the leakage current detection function of the circuit is normal. As shown inFIG.3, pressing the switch S4can simulate the output of the control signal from the drive module01and control the conduction of the diode SCRC2, and then detect. Whether the main switch S will trip, so as to detect whether the leakage current detection and power-off functions of this embodiment are normal.

The circuit structure of this embodiment is simple, the wiring arrangement of the circuit board is easy, and there are few components, so that the volume of this embodiment is smaller.

A leakage current detection device provided in this embodiment as shown inFIG.4toFIG.7, includes a casing and a plurality of pins3, and also includes a control circuit board4disposed in the casing, a leakage detection circuit breaker assembly, a plurality of cable connectors5, and a number of conductive output parts6, the control circuit board is provided with the circuit of the first or second embodiment, wherein a number of pins are respectively connected to the input terminal L and the input terminal N, and a number of cable connectors are respectively connected to the output terminal LO and the output terminal NO are connected, and the conductive output member6corresponds to the main switch S. The conductive output member6is signal-connected with the control circuit board4, the shell is provided with a button7, and the leakage detection circuit breaker assembly is signal-connected with the control circuit board4; the leakage detection circuit breaker assembly is used to control the button7to be disconnected when leakage current is generated; a number of conductive The output piece6is in one-to-one correspondence with a number of pins3, the button7is used to control whether one end of the conductive output piece6is signally connected to the pin3, and the other end of the conductive output piece6is welded with the cable connector5.

Specifically, the conductive output member6is installed on the outer casing, and the optional installation method is shown inFIG.6andFIG.7, wherein the outer casing includes an upper casing1and a lower casing2, the lower casing2is protruded with a fixing column8, and the upper casing1is provided with a groove9, the fixing column8is assembled in the groove9and forms a catch10with the bottom of the groove9, and the other end of the conductive output piece6is inserted into the catch10, so the other end is stably fixed in the casing after passing through the card position10. Therefore, the structure of this embodiment except the cable connector5can be produced independently. At the same time, the cable connector5can also be produced independently. The cable connector5is welded to the junction of the conductive output member6, and the welding method is such as butt welding, so the production and assembly of this embodiment are more convenient, and the efficiency is also improved.

Further, as shown inFIGS.7and8, the lower shell2is protruded with a rib ring11, the upper shell1is provided with a connecting groove12, and the rib ring11is assembled in the connecting groove12after the upper shell1and the lower shell2are assembled.

Specifically, through the cooperating arrangement of the rib ring11and the connecting groove12, the assembly of the casing can be more stable and have better sealing performance, and a sealing ring can be further arranged in the connecting groove12to improve the sealing and waterproofing effect.

In a leakage current detection device provided in this embodiment, as shown inFIGS.8to12, a waterproof component is installed in the casing, and the waterproof component includes a waterproof gasket13; a fixed seat14is installed in the casing, and the fixed seat14is detachably installed on the lower shell2, the waterproof gasket13is installed between the fixed seat14and the lower shell2, the lower shell2is provided with a button hole15for the button7to be exposed, and the waterproof gasket13is used to connect the button hole15to the inner space of the shell.

Specifically, the assembly of the button7in this embodiment is also provided with a waterproof component. The structure is shown inFIG.10. The U-shaped elastic ring16is provided with a through hole17, the hole wall of the through hole17is provided with a limiting groove19, and the outer periphery of the button7is provided with a limiting ring18. Therefore, in the direction ofFIG.9andFIG.10, when the button7is pressed up and down, the button7not be separated from the waterproof gasket13due to the limitation of the position ring18, and because the U-shaped elastic ring16has Elastic, can be stretched up and down with the button7, does not limit the function of the button7, and can maintain the waterproof effect.

Further, as shown inFIGS.10and11, the waterproof gasket13is protruded with a sealing rib20, and the sealing rib20is used to abut against the inner wall of the lower casing2, thereby increasing the sealing and waterproof performance between the waterproof gasket13and the outer casing.

Further, as shown inFIG.12, the side of the waterproof gasket13in contact with the fixing seat14is protruded with a surrounding ring21. The surrounding ring21forms an installation groove (not shown in the drawing), and the fixing seat14is limited in the installation groove. Therefore, the stability of the assembly between the fixed seat14and the waterproof gasket13can be ensured. After the fixed seat14is assembled to the casing, the position of the waterproof gasket13can be fixed at the same time, so as to prevent the waterproof gasket13from being displaced and affecting the waterproofing effect.

A leakage current detection device provided in this embodiment as shown inFIG.7toFIG.10, the leakage detection circuit breaker assembly includes a circuit breaker23, a circuit breaker bracket24, a connector25, a connection reset component26and a button reset component27, and the pins3are provided with fixed contact28; the button reset member27is sleeved on the outer periphery of the button7and is used to reset the button7, and the connection reset member26is used to reset the connection member25, wherein the circuit breaker23can specifically be an electromagnet and is provided in the power circuit. When the leakage current occurs, the two ends of the circuit breaker23generate a voltage difference, and then magnetism occurs, and the generated magnetism can attract the connecting piece25and make the connecting piece25move; the circuit breaker23is installed on the control circuit board4and it is signal-connected with the control circuit board4, the connector25is movably installed on the circuit breaker bracket24, and the output end of the circuit breaker23is installed on the connector25and is used to drive the connector25to move; both sides of the circuit breaker bracket24are installed. There is a control arm29, a drive slot30is formed on the connector25, and a card slot31is formed at the bottom of the button7; when the button7is closed, the groove wall of the drive slot30is clamped in the card slot31and the button7drives the connector25to move the connecting member25is used to drive the circuit breaker support24to move, and the control arm29of the circuit breaker support24is used to drive the conductive output member6to contact the fixed contact28. Optionally, the circuit breaker bracket24is provided with a through slot32, the connecting piece25is movably assembled in the through slot32, the connecting piece25is provided with a limiting bump33, and one end of the connecting reset piece26is sleeved on the limiting bump33, and the connection is reset. The other end of the piece26abuts against the circuit breaker bracket24.

Specifically, the control circuit board4of this embodiment is designed with a corresponding leakage detection circuit and leakage detection elements, such as mutual inductance coils, to sense whether there is leakage current in the live wire and the neutral wire. During normal operation, as shown inFIG.9, when the button7is pressed and the button7is lowered, the slope at the bottom of the button7will squeeze the connecting piece25to move, and be stuck into the slot31of the button7, so the button7, during the reset process, the connecting piece25will be driven to move up, and the connecting piece25will drive the circuit-breaker support24to move upward, so that the two control arms29of the circuit-breaker support24will press the conductive output piece6up, so that the conductive output piece6is connected to the pin. The fixed contact28of 3 contacts, connects the pin3and the cable connector5, and generates an output voltage. When the leakage current is generated, the leakage detection element of the control circuit board4will generate an induction signal, the circuit breaker23will generate magnetism and move to the right in the direction shown in the figures. The button7is separated, and the button7is reset under the driving of the button reset member27, so the connecting member25and the circuit breaker bracket24are also moved down to reset, and the connecting member26is connected to the left to reset the connecting member25, and the conductive output member6is not connected with the fixed contact. The point28is in contact, the pin3is not connected to the cable connector5, so no output voltage and current are generated, which makes the electrical equipment connected to the leakage current detection circuit breaker23of this embodiment safer and reduces the occurrence of safety accidents.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Technicians, within the scope of the technical solution of the present invention, make some changes or modifications to equivalent examples of equivalent changes by using the technical content disclosed above, but if they do not depart from the content of the technical solution of the present invention, according to the present invention Technology refers to any simple modifications, equivalent changes and modifications made to the above embodiments, all within the scope of the technical solutions of the present invention.