CN114301039A - GFCI capable of alarming after neutral line grounding fault detection function failure - Google Patents
GFCI capable of alarming after neutral line grounding fault detection function failure Download PDFInfo
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Abstract
The invention discloses a GFCI capable of alarming after the failure of the neutral line grounding fault detection function, which comprises the following components: a power module comprising two independent power supply sections: a leakage detection part working power supply and a life terminal self-detection part working power supply; an integrated circuit chip U1; the switch resetting and breaking module is respectively connected with the integrated circuit chip U1 and a live wire of an alternating current power supply; the electronic reset module is respectively connected with the power supply module and the integrated circuit chip U1; the leakage current detection module comprises a zero sequence current mutual inductance coil A2 and is arranged outside a live wire and a zero wire of the alternating current power supply in a penetrating way; the neutral wire misconnection protection module comprises a neutral high-frequency coil A1 which is arranged outside a live wire and a zero wire of an alternating current power supply in a penetrating mode, and a lead which penetrates through a zero-sequence current mutual inductor A2 and a neutral high-frequency coil A1, wherein one end of the lead is connected to a ground wire end of a self-checking function module of an integrated circuit chip U1, and the other end of the lead is connected to a neutral wire grounding fault detection input end of the integrated circuit chip U1.
Description
Technical Field
The present invention relates to an electric appliance protection device, and more particularly, to a GFCI (ground fault circuit interrupter) capable of alarming after a neutral ground fault detection function fails.
Background
The GFCI is an English group Fault Circuit Interrupter for short, the Chinese is called as a Ground Fault Circuit Interrupter, and the GFCI is a special electrical appliance protection device aiming at the North America market, the working voltage of the GFCI is 102VAC-132VAC, the working temperature is-35-66 ℃, and the disconnection time is less than 25 mS. A fixedly mounted GFCI should have a neutral wire mis-grounded trip function as per us UL943 requirements. In addition, according to the requirements of U.S. UL943, the fixedly installed GFCI has the function of excessive leakage current protection, the load end of the GFCI generates leakage current, and the GFCI immediately cuts off a power supply when the leakage current value exceeds the prefabricated direct current value; and the fixedly installed GFCI has the functions of leakage current protection function failure alarm and tripping, so that GFCI produced after 2015 has the automatic monitoring function, and the power supply is cut off immediately after the GFCI automatically detects that the leakage current protection function is abnormal.
Although the existing GFCI can execute a trip action after the neutral wire is erroneously grounded, when a component of the functional module is damaged, the product can not send a warning signal and can not cut off the power supply after the neutral wire is erroneously grounded, and the user can still use the product as a qualified product, which brings a potential safety hazard to the user.
Disclosure of Invention
In order to solve the problems, the invention provides a GFCI capable of alarming after the neutral line ground fault detection function fails, a lead penetrating through a zero sequence current mutual inductance coil and a neutral high-frequency coil is added between a ground terminal of a self-checking function module of an integrated circuit chip and a neutral line ground fault detection input end for carrying out neutral line false ground test when the power supply is in a negative half cycle, so that a product can be prevented from tripping after a thyristor is triggered when the product is normal, an LED alarm signal can be immediately sent out after the product is found to be bad through the test, and a trigger signal is sent to the thyristor at the same time, so that the product trips and the power supply is cut off.
To achieve the above object, the present invention provides a GFCI capable of alarming after failure of a neutral ground fault detection function, comprising:
a power module comprising two independent power supply sections, respectively: a leakage detection part working power supply and a life terminal self-detection part working power supply;
an integrated circuit chip U1;
the switch resetting and breaking module is respectively connected with the integrated circuit chip U1 and a live wire of an alternating current power supply and is used for driving the tripper to break or switch on the power supply;
an electronic reset module, which is respectively connected with the power module and the integrated circuit chip U1;
the leakage current detection module is connected with the integrated circuit chip U1 and comprises a zero-sequence current mutual inductor A2 which is arranged outside a live wire and a zero wire of an alternating current power supply in a penetrating way and is used for detecting unbalanced current in a power supply circuit; and
a neutral misconnection protection module coupled to the integrated circuit chip U1, the neutral misconnection protection module comprising:
the neutral high-frequency coil A1 is arranged outside the live wire and the zero wire of the alternating current power supply in a penetrating way and is used for detecting a neutral wire error grounding signal;
and a lead penetrates through the zero sequence current mutual inductor A2 and the neutral high-frequency coil A1, one end of the lead is connected to the ground terminal of the self-test functional module of the integrated circuit chip U1, and the other end of the lead is connected to the ground fault detection input end of the neutral line of the integrated circuit chip U1.
In an embodiment of the present invention, the power module is packaged in an integrated circuit, and specifically includes:
the leakage detecting part operating power supply includes: a bridge rectifier D2, two input terminals of which are connected to the live and neutral wires of the AC power supply; one output end of the bridge rectifier D2 is connected with the anode of a diode D6, and the cathode of a diode D6 is connected with the zero line of the alternating current power supply; the other output end of the bridge rectifier D2 is connected in series with a voltage reduction resistor R6 and a filter capacitor C5 in sequence and then connected to the anode of the diode D6, wherein the connection end of the voltage reduction resistor R6 and the filter capacitor C5 serves as a power supply end of the leakage detection part;
the partial working power supply of life terminal self-checking includes: the anode of a diode D1 is connected to the live wire of the alternating current power supply, the cathode of a diode D1 is connected to the anode of a diode D6 after being sequentially connected with a step-down resistor R1 and a filter capacitor C1 in series, wherein the connection end of the step-down resistor R1 and the filter capacitor C1 is used as the power supply end of the life end self-checking part.
In an embodiment of the present invention, the switch resetting and disconnecting module includes:
one end of a solenoid L1 is connected to a live wire of an alternating current power supply, the other end of the solenoid L1 is connected to an anode of a diode D3, a cathode of a diode D3 is connected to an anode of a thyristor Q1, a cathode of the thyristor Q1 is grounded, and a control electrode of the thyristor Q1 is connected in series with a resistor R8 and then connected to an output end of a driving thyristor of the integrated circuit chip U1;
one end of a solenoid L2 is connected to a live wire of an alternating current power supply, the other end of the solenoid L2 is connected to an anode of a diode D4, a cathode of a diode D4 is connected to an anode of a thyristor Q2, a cathode of the thyristor Q2 is grounded, and a control electrode of the thyristor Q2 is connected in series with a resistor R9 and then connected to a reset key signal output end of the integrated circuit chip U1;
a capacitor C7 is connected between the control electrode and the cathode of the controlled silicon Q1, and a capacitor C8 is connected between the control electrode and the cathode of the controlled silicon Q2.
In an embodiment of the present invention, the electronic reset module includes:
the power supply end of the life terminal self-checking part is connected with a resistor R15, a reset key switch S1 and a resistor R10 in series in sequence and then connected to the reset key input end of the integrated circuit chip U1.
In an embodiment of the present invention, the leakage current detection module further includes:
two terminals of the zero-sequence current mutual inductor A2 are connected with a resistor R3 and a resistor R4 respectively and then are connected with two leakage detection signal input ends of the integrated circuit chip U1;
a capacitor C2 and a resistor R2 are connected in parallel between the two leakage detection signal input ends of the integrated circuit chip U1.
In an embodiment of the present invention, the neutral wire mis-grounding protection module further includes:
one terminal of the neutral high-frequency coil A1 is grounded, and the other terminal of the neutral high-frequency coil A1 is connected with a resistor R7 and a capacitor C4 in series in sequence and then is connected with a neutral ground fault detection feedback end of the integrated circuit chip U1;
and a capacitor C3 is connected between two terminals of the neutral high-frequency coil A1.
In an embodiment of the present invention, the present invention further includes an alarm module, specifically:
the anode of a light emitting diode D11 is connected in series with a resistor R13 and then is connected to the fault alarm output end of the integrated circuit chip U1, and the cathode of the light emitting diode D11 is grounded.
Compared with the prior art, the GFCI capable of giving an alarm after the neutral line ground fault detection function fails can perform neutral line false ground test when the power supply is in a negative half cycle, not only can prevent a product from tripping after a thyristor is triggered when the product is normal, but also can immediately send an LED alarm signal after the product is found to be bad through the test, and simultaneously send a trigger signal to the thyristor to trip the product and cut off the power supply, so that potential safety hazards caused by the damage of a certain component are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an overall circuit diagram of an embodiment of the present invention;
FIG. 2 is a partial circuit diagram of a power module according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an illustrative list of pins of an integrated circuit chip according to an embodiment of the invention;
FIG. 4 is a partial circuit diagram of a switch reset and disconnect module in accordance with an embodiment of the present invention;
FIG. 5 is a partial circuit diagram of an electronic reset module according to an embodiment of the present invention;
fig. 6 is a partial circuit diagram of the leakage current detection module and the neutral wire mis-grounding protection module according to an embodiment of the invention.
Description of reference numerals: d2-bridge rectification; d1, D3, D4, D6-diodes; r1, R6-dropping resistor; c1, C5-filter capacitance; VG-a power supply terminal of the leakage detecting section; VS-life-span terminal self-checking part power supply terminal; u1 — integrated circuit chip; a 1-neutral high-frequency coil; a2-zero sequence current mutual inductance coil; c2, C3, C4, C7, C8-capacitance; r2, R3, R4, R7, R8, R9, R10, R13, R14, R15-resistor; q1, Q2-SCR; l1, L2-solenoid; s1-reset key switch; d11-light emitting diode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 is an overall circuit diagram of an embodiment of the present invention, which discloses a GFCI capable of alarming after a failure of a neutral ground fault detection function, as shown in fig. 1, and includes:
a power module comprising two independent power supply sections, respectively: a leakage detection part working power supply and a life terminal self-detection part working power supply;
fig. 2 is a partial circuit diagram of a power module in an embodiment of the present invention, as shown in fig. 1 and fig. 2, in the embodiment, the power module is packaged in an integrated circuit, and two power sources are provided to ensure that the life end self-checking portion can still work normally after the leakage detecting portion loses a leakage protection function due to a power source problem, which is specifically:
the leakage detecting part operating power supply includes: a bridge rectifier D2 having two inputs (1 and 2) connected to the line and neutral conductors (L and N in fig. 1) of the ac power supply; one output end (3) of the bridge rectifier D2 is connected with the anode of a diode D6, and the cathode of a diode D6 is connected with the zero line (N in figure 1) of the alternating current power supply; the other output end (4) of the bridge rectifier D2 is connected in series with a voltage reduction resistor R6 and a filter capacitor C5 in sequence and then connected to the anode of a diode D6, wherein the connection end of the voltage reduction resistor R6 and the filter capacitor C5 serves as a power supply end (VG) of the leakage detection part;
the partial working power supply of life terminal self-checking includes: an anode of the diode D1 is connected to a live line (L in fig. 1) of the ac power supply, and a cathode of the diode D1 is connected to an anode of the diode D6 after being connected in series with the step-down resistor R1 and the filter capacitor C1, wherein a connection end of the step-down resistor R1 and the filter capacitor C1 serves as a power supply end (VS) of the life end self-test portion.
An integrated circuit chip U1, which is used for leakage detection signal input, tripping signal output, service life terminal self-checking input, neutral line error grounding signal input, reset key input, fault alarm output and reset signal output;
fig. 3 is a schematic diagram illustrating pin specification list of an integrated circuit chip according to an embodiment of the present invention, and as shown in fig. 3, the integrated circuit chip U1 selected in this embodiment has 16 pins, where pins 1-2 are a leakage detection signal input terminal, pins 3 and 4 are a GFCI control circuit ground terminal and a self-test function module ground terminal, respectively, pin 5 is a neutral ground fault detection input terminal, pin 6 is a self-test signal input terminal, pin 7 is a reset key input terminal, pin 8 is a self-test function power supply terminal connected to a power supply terminal (VS) of a life terminal self-test part, pin 9 is a fault alarm output terminal, pin 10 is an analog fault excitation output terminal, pin 11 is a reset key signal output terminal, pin 12 is a neutral ground fault detection feedback terminal, pin 13 is a driving thyristor output terminal, pin 14 is a leakage filter output terminal, and pin 15 is a self-test mode input terminal, the pin 16 is a power supply terminal (VG) of the GFCI control circuit power line connected to the leakage detection portion, and in other embodiments, an integrated circuit chip in other pin forms may be used to implement the above functions, and the invention is not limited to the type.
The switch resetting and breaking module is respectively connected with the integrated circuit chip U1 and a live wire (L in figure 1) of an alternating current power supply and is used for driving the tripper to break or switch on the power supply;
fig. 4 is a partial circuit diagram of a switch resetting and disconnecting module according to an embodiment of the present invention, as shown in fig. 1 and 4, in the embodiment, the switch resetting and disconnecting module includes:
one end of a solenoid L1 is connected to a live wire (L in FIG. 1) of an alternating current power supply, the other end of the solenoid L1 is connected to an anode of a diode D3, a cathode of a diode D3 is connected to an anode of a thyristor Q1, a cathode of the thyristor Q1 is grounded, and a control electrode of the thyristor Q1 is connected in series with a resistor R8 and then connected to an output end (pin 13) of a driving thyristor of the integrated circuit chip U1;
one end of a solenoid L2 is connected to a live wire (L in FIG. 1) of an alternating current power supply, the other end of the solenoid L2 is connected to an anode of a diode D4, a cathode of a diode D4 is connected to an anode of a thyristor Q2, a cathode of the thyristor Q2 is grounded, and a control electrode of the thyristor Q2 is connected in series with a resistor R9 and then connected to a reset key signal output end (pin 11) of the integrated circuit chip U1;
a capacitor C7 is connected between the control electrode and the cathode of the controlled silicon Q1, and a capacitor C8 is connected between the control electrode and the cathode of the controlled silicon Q2.
In the embodiment, the switch resetting and breaking module is used for receiving a signal sent by the integrated circuit chip U1 and turning on the thyristor Q1 or Q2 to enable current to flow through the solenoid L1 or L2 to generate electromagnetic force, so that the purposes of breaking and connecting a power supply after driving the tripper are achieved.
The electronic reset module is respectively connected with the power supply module and the integrated circuit chip U1;
fig. 5 is a partial circuit diagram of an electronic reset module according to an embodiment of the present invention, as shown in fig. 1 and 5, in the embodiment, the electronic reset module includes:
the power supply (VS) of the self-checking part at the end of life is connected with a resistor R15, a reset key switch S1 and a resistor R10 in series in turn, and then is connected with the reset key input end (pin 7) of the integrated circuit chip U1.
In the embodiment, after voltage sampling (VS voltage sampling) is performed on the working power supply of the self-checking part of the life terminal through the inside of the integrated circuit chip U1, a reset signal can be output through the pin 11, the reset signal is transmitted to the thyristor Q2 to be conducted, and after the thyristor Q2 is conducted, current flows through the solenoid L2 to generate electromagnetic force to drive the movable contact of the tripping mechanism to move, so that the power supply voltage is switched on.
The leakage current detection module is connected with the integrated circuit chip U1 and comprises a zero-sequence current mutual inductor A2 which is arranged outside a live wire and a zero wire (L and N in the figure 1) of an alternating current power supply in a penetrating way and is used for detecting unbalanced current in a power supply circuit;
fig. 6 is a partial circuit diagram of a leakage current detection module and a neutral line misconnection protection module according to an embodiment of the present invention, as shown in fig. 1 and 6, in this embodiment, the leakage current detection module further includes:
two terminals (1 and 2) of the zero-sequence current mutual inductor A2 are respectively connected with a resistor R3 and a resistor R4 and then are connected with two leakage detection signal input ends (pins 1 and 2) of an integrated circuit chip U1;
the two ends of the capacitor C2 and the resistor R2 connected in parallel are respectively connected to two leakage detection signal input ends (pins 1 and 2) of the integrated circuit chip U1.
In this embodiment, an unbalanced current in a power supply line is detected by using a zero-sequence current mutual inductor a2, a detected unbalanced current signal is sent to an integrated circuit chip U1 for analysis and processing, when the unbalanced current reaches a preset threshold, an integrated circuit chip U1 sends a trip signal to a thyristor Q1 of a switch reset and breaking part, the current after the thyristor Q1 is opened generates an electromagnetic force after passing through a solenoid L1, and the electromagnetic force drives a trip mechanism to act, so as to achieve the purpose of cutting off the power supply.
A neutral misconnection protection module connected to the integrated circuit chip U1, the neutral misconnection protection module comprising:
a neutral high-frequency coil A1, which is arranged outside the live wire and the zero wire (L and N in figure 1) of the AC power supply in a penetrating way and is used for detecting the error grounding signal of the neutral wire;
a wire (bold black line in the figure) passes through the zero sequence current transformer a2 and the neutral high frequency coil a1, one end of the wire is connected to the ground terminal (pin 4) of the self test function module of the integrated circuit chip U1, and the other end of the wire is connected to the ground fault detection input (pin 5) of the neutral line of the integrated circuit chip U1.
As shown in fig. 1 and 6, in this embodiment, the neutral wire mis-grounding protection module further includes:
one terminal (2) of the neutral high-frequency coil A1 is Grounded (GND), and the other terminal (1) of the neutral high-frequency coil A1 is connected with a resistor R7 and a capacitor C4 in series in sequence and then is connected to a neutral ground fault detection feedback terminal (pin 12) of an integrated circuit chip U1;
a capacitor C3 is connected between the two terminals (1 and 2) of the neutral high-frequency coil A1.
The working principle of the neutral line misconnection protection explained in conjunction with the embodiment is as follows: the pin 12 of the integrated circuit chip U1, the capacitor C4, the resistor R7, the capacitor C3 and the neutral high-frequency coil A1 are combined together to generate self-excited oscillation, if the neutral line is connected with the ground by mistake, a self-excited oscillation signal can be fed back to a detection magnetic ring of the neutral high-frequency coil A1, the detection magnetic ring senses the self-excited oscillation signal and then sends a trigger pulse to the integrated circuit chip U1 to trigger the silicon controlled Q1 to be opened, the current after the silicon controlled Q1 is opened passes through the solenoid L1 to generate electromagnetic force, the electromagnetic force drives a tripping mechanism to act, and the purpose of cutting off the power supply is achieved. In this embodiment, the integrated circuit chip U1 can also perform self-test according to a fixed period, that is, during self-test, a simulated neutral wire misgrounding signal is applied through a conducting wire penetrating through magnetic rings of two coils (a1 and a2), a negative half cycle of a power supply live wire (L) is preset when the simulated neutral wire misgrounding signal is applied, and at the same time, a pin 6 of the integrated circuit chip U1 raises a level of the thyristor Q2, and at this time, the simulated neutral wire misgrounding signal is detected by the magnetic ring of the zero-sequence current mutual inductor a2 and a trigger signal is sent from a pin 13 of the integrated circuit chip U1 to trigger the thyristor Q2. At the moment, the live wire (L) of the power supply is in a negative half cycle, so that the tripping mechanism of the GFCI cannot be tripped, but the conduction of the silicon controlled rectifier Q2 can pull down the voltage of the pin 6 of the integrated circuit chip U1, the integrated circuit chip U1 can judge that the leakage current detection and neutral wire misconnection protection functions of the product are normal, and otherwise, an alarm and a tripping signal can be sent out.
In this embodiment, the mobile terminal further includes an alarm module, specifically:
the anode of the LED D11 is connected in series with a resistor R13 and then connected to the fault alarm output terminal (pin 9) of the IC chip U1, and the cathode of the LED D11 is Grounded (GND).
The embodiment also comprises a switch part and an indicator light part of the existing GFCI, a resistor R12, a diode D8 and a light emitting diode D7 are sequentially connected between the live wire and the zero wire of the load end, a voltage dependent resistor MOV1, a resistor R16 and a switch S2 are sequentially connected between the live wire (L) of the alternating current power supply and the live wire of the load end, and the connection point of the voltage dependent resistor MOV1 and the resistor R16 is also connected to the zero wire (N) of the alternating current power supply.
In this embodiment, a resistor R14 is connected between a self-test mode input terminal (pin 15) of the integrated circuit chip U1 and a GFCI control circuit power line (pin 16), a leakage filter output terminal (pin 14) of the integrated circuit chip U1 is Grounded (GND) through a filter capacitor C6, and a resistor R11 is connected between a fault alarm output terminal (pin 9) of the integrated circuit chip U1 and a control electrode of the thyristor Q1; after a diode D5 is connected in parallel with a resistor R5, the anode of the diode D5 is connected to the self-test signal input terminal (pin 6) of the ic chip U1, and the cathode of the diode D5 is connected to the anode of the thyristor Q1.
The GFCI capable of alarming after the neutral line ground fault detection function fails is characterized in that a lead penetrating through a zero-sequence current mutual inductor and a neutral high-frequency coil is additionally arranged between a ground wire end of a self-checking function module of an integrated circuit chip and a neutral line ground fault detection input end so as to carry out neutral line false ground test when the power supply is in a negative half cycle, thus the product can be prevented from tripping after a silicon controlled rectifier is triggered when the product is normal, an LED alarm signal can be immediately sent out after the product is found to be bad through the test, and a trigger signal is sent to the silicon controlled rectifier so as to trip the product and cut off the power supply.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A GFCI capable of alarming upon failure of a neutral ground fault detection function, comprising:
a power module comprising two independent power supply sections, respectively: a leakage detection part working power supply and a life terminal self-detection part working power supply;
an integrated circuit chip U1;
the switch resetting and breaking module is respectively connected with the integrated circuit chip U1 and a live wire of an alternating current power supply and is used for driving the tripper to break or switch on the power supply;
an electronic reset module, which is respectively connected with the power module and the integrated circuit chip U1;
the leakage current detection module is connected with the integrated circuit chip U1 and comprises a zero-sequence current mutual inductor A2 which is arranged outside a live wire and a zero wire of an alternating current power supply in a penetrating way and is used for detecting unbalanced current in a power supply circuit; and
a neutral misconnection protection module coupled to the integrated circuit chip U1, the neutral misconnection protection module comprising:
the neutral high-frequency coil A1 is arranged outside the live wire and the zero wire of the alternating current power supply in a penetrating way and is used for detecting a neutral wire error grounding signal;
and a lead penetrates through the zero sequence current mutual inductor A2 and the neutral high-frequency coil A1, one end of the lead is connected to the ground terminal of the self-test functional module of the integrated circuit chip U1, and the other end of the lead is connected to the ground fault detection input end of the neutral line of the integrated circuit chip U1.
2. The GFCI capable of alarming after a failure of a neutral ground fault detection function as claimed in claim 1, wherein the power module is packaged in an integrated circuit and is specifically:
the leakage detecting part operating power supply includes: a bridge rectifier D2, two input terminals of which are connected to the live and neutral wires of the AC power supply; one output end of the bridge rectifier D2 is connected with the anode of a diode D6, and the cathode of a diode D6 is connected with the zero line of the alternating current power supply; the other output end of the bridge rectifier D2 is connected in series with a voltage reduction resistor R6 and a filter capacitor C5 in sequence and then connected to the anode of the diode D6, wherein the connection end of the voltage reduction resistor R6 and the filter capacitor C5 serves as a power supply end of the leakage detection part;
the partial working power supply of life terminal self-checking includes: the anode of a diode D1 is connected to the live wire of the alternating current power supply, the cathode of a diode D1 is connected to the anode of a diode D6 after being sequentially connected with a step-down resistor R1 and a filter capacitor C1 in series, wherein the connection end of the step-down resistor R1 and the filter capacitor C1 is used as the power supply end of the life end self-checking part.
3. The GFCI capable of alarming after a failure of a neutral ground fault detection function of claim 2, wherein the switch reset and disconnect module comprises:
one end of a solenoid L1 is connected to a live wire of an alternating current power supply, the other end of the solenoid L1 is connected to an anode of a diode D3, a cathode of a diode D3 is connected to an anode of a thyristor Q1, a cathode of the thyristor Q1 is grounded, and a control electrode of the thyristor Q1 is connected in series with a resistor R8 and then connected to an output end of a driving thyristor of the integrated circuit chip U1;
one end of a solenoid L2 is connected to a live wire of an alternating current power supply, the other end of the solenoid L2 is connected to an anode of a diode D4, a cathode of a diode D4 is connected to an anode of a thyristor Q2, a cathode of the thyristor Q2 is grounded, and a control electrode of the thyristor Q2 is connected in series with a resistor R9 and then connected to a reset key signal output end of the integrated circuit chip U1;
a capacitor C7 is connected between the control electrode and the cathode of the controlled silicon Q1, and a capacitor C8 is connected between the control electrode and the cathode of the controlled silicon Q2.
4. The GFCI capable of alarming after a failure of a neutral ground fault detection function of claim 2, wherein the electronic reset module comprises:
the power supply end of the life terminal self-checking part is connected with a resistor R15, a reset key switch S1 and a resistor R10 in series in sequence and then connected to the reset key input end of the integrated circuit chip U1.
5. The GFCI capable of alarming after a failure of a neutral ground fault detection function of claim 2, wherein the leakage current detection module further comprises:
two terminals of the zero-sequence current mutual inductor A2 are connected with a resistor R3 and a resistor R4 respectively and then are connected with two leakage detection signal input ends of the integrated circuit chip U1;
a capacitor C2 and a resistor R2 are connected in parallel between the two leakage detection signal input ends of the integrated circuit chip U1.
6. The GFCI capable of alerting after a failure of a neutral ground fault detection function of claim 2, wherein the neutral misconnection protection module further comprises:
one terminal of the neutral high-frequency coil A1 is grounded, and the other terminal of the neutral high-frequency coil A1 is connected with a resistor R7 and a capacitor C4 in series in sequence and then is connected with a neutral ground fault detection feedback end of the integrated circuit chip U1;
and a capacitor C3 is connected between two terminals of the neutral high-frequency coil A1.
7. The GFCI capable of alarming after a failure of a neutral ground fault detection function as claimed in claim 2, further comprising an alarm module, in particular:
the anode of a light emitting diode D11 is connected in series with a resistor R13 and then is connected to the fault alarm output end of the integrated circuit chip U1, and the cathode of the light emitting diode D11 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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