CN101478099B - Neutral grounding fault creepage protecting plug - Google Patents
Neutral grounding fault creepage protecting plug Download PDFInfo
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- CN101478099B CN101478099B CN 200810000037 CN200810000037A CN101478099B CN 101478099 B CN101478099 B CN 101478099B CN 200810000037 CN200810000037 CN 200810000037 CN 200810000037 A CN200810000037 A CN 200810000037A CN 101478099 B CN101478099 B CN 101478099B
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Abstract
The invention relates to a plug for a ground fault creepage protector, which consists of a housing, a circuit board control circuit arranged inside the housing, a relay control circuit mechanism arranged inside the housing. The circuit board control circuit consists of a DC power supply, an absorption retaining circuit, an instant start-up circuit, an integrated amplifying circuit, a fault current sensing circuit, a neutral false ground circuit and a release control circuit. The plug for the ground fault creepage protector overcomes the defects of the prior mechanical-type restoration structure; and the neutral failure is prevented from being out of control if the neutral line contacts falsely or the circuit is opened artificially on restoration. In addition, the invention has the advantages of high security, flexible delicate protection actions against neutral fault and creepage, as well as convenient assembly, and serves the functions of resisting shock, resisting water, resisting false restoration, resisting backward false wiring, resisting broken input phase lines/neutral lines, protecting against poor contact, and automatically disconnecting an electric power supply.
Description
Technical field
The present invention relates to a kind of plug; particularly a kind of all can automatically cut off the power supply defencive function and adopt electronics moment to start with water-proof function, backward error wiring protection function, input phase line/broken neutral line or loose contact reset the neutral grounding fault creepage protecting plug that resets and keep.
Background technology
Protective device such as neutral grounding fault creepage protecting plug (GFCI) get an electric shock and neutral ground fault creepage protecting equipment and fire incident owing to can effectively prevent the person, thereby are subject to extensive use.
Along with the development of science and technology, neutral grounding fault creepage protecting plug is to high-performance, high sensitivity, multifunction protection future development.The disadvantages such as the neutral grounding fault creepage protecting plug in past is structurally generally fairly simple, and at the bottom of the sensitivity, protective value is poor, and function is few.Perplexing for a long time inconvenience and the life security of people's lives.
For example: US Patent No. 5,943,199 described leakage protecting plugs are to adopt the mechanical type return actuator, and its described reset lever (reset column) spurs its actuator by the hook on the actuator (actuator), and relay is resetted; This device is to utilize the armature on the release to drive actuator, makes the hook on the actuator break away from reset lever, thereby earth leakage protective device is threaded off; All earth leakage protective devices that adopt similar this kind technology to produce have a common drawback; when hook and release link contact-making surface or contact force are excessive, will cause that dropout is not agile exactly; and will cause that when reducing its contact-making surface or contact force the slight vibration of product will thread off; therefore namely the false tripping phenomenon can occur, the product produced of this technology is no matter be from the processing aspect or all there is very large hidden danger in the properties of product aspect.
And nowadays American patent US6; 624; 991B1 and US5; 815,363 described earth leakage protective devices are to adopt the electric protection snap close, and its tripping coil is in "on" position always after the power-on-reset; its unique properties; it is highly sensitive to have neutral fault earth leakage protective, multiple functional, deeply is subjected at present liking and favoring of Foreign User.
Summary of the invention
Technical problem to be solved by this invention provide a kind of all can automatically cut off the power supply defencive function and adopt electronics moment to start with water-proof function, backward error wiring protection function, input phase line/broken neutral line or loose contact reset the neutral grounding fault creepage protecting plug that resets and keep.
For solving the problems of the technologies described above, the present invention realizes as follows: earth fault earth leakage protective device plug of the present invention is comprised of housing, the circuit board control circuit that is positioned at housing, the control relay circuit mechanism that is positioned at housing.The circuit board control circuit is comprised of governor circuit and auxiliary circuit: this governor circuit again by DC power supply, adhesive holding circuit, moment start-up circuit three parts form, auxiliary circuit is comprised of integrated amplifier, fault current detection circuit, neutral misconnection ground circuit, release control circuit four parts again.
DC power supply consists of half-wave rectifying circuit by diode D1, the alternating current of input is become the direct current of output, diode D1 negative pole is connected with current-limiting resistance R2, the current-limiting resistance R2 other end and filter capacitor C2 be anodal is connected pin and is connected with integrated amplifier, provide integrated amplifier supply power voltage DC/26V, wherein C2 negative pole and integrated amplifier 4 pin difference ground connection; The adhesive holding circuit is connected with D1 is anodal by the power supply phase line, and alternating current is become direct current, and the D1 negative pole is connected with the R2 current-limiting resistance, current-limiting resistance R1, the R2 other end is connected with the C1 capacitance cathode, sends eliminating the direct current that exchanges repercussions into L1 trip coil head end, and the L1 coil end is connected with ground wire; Moment, start-up circuit was connected with phase line by reset button S1 normally-closed contact one end, the S1 other end is connected with the R1 current-limiting resistance, the R1 other end and diode D2 positive pole connect and compose half-wave rectifying circuit, and D2 negative pole and C1 positive pole connect and compose filter circuit, send eliminating about the direct current second voltage DC/30V that exchanges repercussions into L1 trip coil head end, and L1 coil end ground connection; Integrated amplifier is neutral grounding fault creepage protecting plug (GFCI) application-specific integrated circuit (ASIC), and its model: RV4145AN is called for short the IC chip, and this chip belongs to single operational amplifier; The fault current detection circuit is that the input power wire is penetrated magnetic test coil T1 simultaneously, two output shunt capacitance C7 of magnetic test coil T1, one end series capacitance C6 of magnetic test coil, the C6 other end is connected with resistance R 7, the other end of R7 is connected with the input of integrated amplifier 1 pin, 3 pin of the other end of magnetic test coil and integrated amplifier connect and compose transformer coupled differential input circuit, wherein R6 is feedback resistance, resistance R 6 one ends are connected with integrated amplifier 1 pin, the other end is connected with integrated amplifier output 7 pin, the resistance size of R6 determines the multiplication factor of integrated amplifier 3 pin, namely determines the size of neutral grounding fault creepage protecting plug (GFCI) dropout action failure current value; Neutral misconnection ground circuit is to pass neutral misconnection ground protection coil T2 by the power supply source neutral conductor; T2 shunt capacitance C4; the end of T2 is connected with capacitor C 5; the other end ground connection of T2; capacitor C 5 other ends are connected with integrated amplifier 7 pin outputs; neutral misconnection ground protection coil T2; magnetic test coil T1 consists of the sine-wave oscillator of transformer coupled corresponding frequency of oscillation; when having neutral misconnection ground phenomenon to occur; this oscillator starting of oscillation; when amplitude reaches the threshold values of integrated amplifier; integrated amplifier 5 pin output triggering signal, the release action, neutral grounding fault creepage protecting plug (GFCI) moving contact disconnects.Namely by neutral misconnection ground protection coil T2, integrated amplifier, magnetic test coil T1 forms sinusoidal wave amplifier jointly, (be just to have, the amplifier of feedback enlarging function is finished), when neutral grounding fault creepage protecting plug (GFCI) neutral output terminal line is grounded, magnetic test coil T1, coil T2, integrated amplifier and respective element are grounded the loop and connect, cause positive feedback effect to occur, until circuit vibrates, when the oscillating voltage peak value meets or exceeds the previous peaks of controllable silicon trigger comparator, controllable silicon output can raise, when reaching set point, controlled silicon conducting, release action moment open circuit, coil T2, C4, the C5 frequency of oscillation is higher than sine-wave oscillation frequency, thereby guarantees the loop gain of oscillator; The release control circuit is by trip coil L1, controllable silicon SCR, and diode D3 and capacitor C 3 consist of, wherein the end of trip coil L1 is connected with resistance R 5, controllable silicon anode, the SCR control utmost point and C3, diode D3, integrated amplifier output 5 pin connect, the SCR minus earth.An anti-interference capacitor C3 in parallel between the controllable silicon SCR control utmost point and ground, magnetic test coil T1 detect two power lines by the vector of electric current and, this vector and be zero during the fault-free electric current at ordinary times, when fault current is arranged, this vector and non-vanishing, when fault current increases to the setting threshold values, magnetic test coil can induce a corresponding voltage swing signal, and in 5 pin of integrated amplifier output triggering signal, after the D3 halfwave rectifier, make the controllable silicon SCR conducting, trip coil L1 is charged, release is threaded off in setting time cut off power supply.Feeler switch S2; test resistance R8 consists of a test circuit; wherein; test resistance R8 is connected with power end; the R8 other end is connected with feeler switch S2; the feeler switch other end is connected with the other end of load, and test circuit is to provide fault current about 8mA to neutral grounding fault creepage protecting plug (GFCI), makes regular check on neutral grounding fault creepage protecting plug (GFCI) operating state.Power end piezo-resistance MOV in parallel, when suddenly high voltage being arranged in the power supply, but the transient absorption high voltage, and MOV resistance instantaneous variation is infinitely great, plays the effect of protective circuit plate.Output has LED light to monitor; wherein the LED light circuit is by halfwave rectifier diode D4 rectification; alternating current is become DC direct current 120V; about dc voltage after resistance R 9 current limlitings is for 3V, provide LED light anodal; LED light negative pole and output head grounding; when neutral grounding fault creepage protecting plug (GFCI) when normally exporting, LED light is luminous.
The movable pressure handle of anti-false tripping is connected with the armature plate afterbody; Anti-false tripping spring upper end is connected with the armature plate afterbody, and the lower end is connected with the relay base hook; Anti-false tripping rivet is connected with anti-false tripping support.Contact supporter and spring leaf and input phase line connect to form reset circuit; Left and right moving contact and contact and input fixed contact form the normally-open normally-close contact; When trip coil get electric after, coil and iron core form magnetic field, so left and right moving contact and contact form moving contact and are connected with fixed contact and load are exported power after armature plate moment and iron core closure; Its effect of rivet is that contact supporter and left and right moving contact are riveted tightly; Tension effect when spring leaf has been dropout.
Good effect of the present invention: earth fault earth leakage protective device plug of the present invention has overcome the in the past disadvantage of mechanical type resetting structure; if neutral line virtual connection is touched or when artificially opening a way after in case can not occur resetting; neutral fault just out of control situation occurs; and the present invention has safe; neutral fault earth leakage protective is active in one's movements; easy to assembly; have shockproof; waterproof, the function of anti-errorly reset, the power supply protection being cut off in anti-reverse false wiring, anti-input phase line/broken neutral line and loose contact automatically.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is general assembly circuit theory diagrams of the present invention
Fig. 2 is general assembly structural representation of the present invention
Fig. 3 is the anti-error release amplification assumption diagram of the present invention
Fig. 4 is moving contact component amplification assumption diagram of the present invention
Among the figure: 1, circuit board control circuit 2, housing
3, control relay circuit mechanism 4, moving contact
5, governor circuit 6, auxiliary circuit
7, DC power supply 8, adhesive holding circuit
9, moment start-up circuit 10, integrated amplifier
11, fault current detection circuit 12, neutral misconnection ground circuit
13, release control circuit 17, rivet
18, rivet 20, contact supporter
21, left and right moving contact 22, contact
23, armature plate 27, anti-false tripping extension spring
28, spring leaf 29, the movable pressure handle of anti-false tripping
30, anti-false tripping spring 31, anti-false tripping rivet
32, anti-false tripping support
Embodiment
As shown in the figure, earth fault earth leakage protective device plug of the present invention is comprised of housing 2, the circuit board control circuit 1 that is positioned at housing, the control relay circuit mechanism 3 that is positioned at housing.Circuit board control circuit 1 is comprised of governor circuit 5 and auxiliary circuit 6: this governor circuit again by DC power supply 7, adhesive holding circuit 8, moment start-up circuit 9 three parts form, auxiliary circuit is comprised of integrated amplifier 10, fault current detection circuit 11, neutral misconnection ground circuit 12, release control circuit 13 4 parts again.
The movable pressure handle 29 of anti-false tripping is connected with armature plate 23 afterbodys; Anti-false tripping spring 30 upper ends are connected with armature plate 23 afterbodys, and the lower end is connected with the relay base hook; Anti-false tripping rivet 31 is connected with anti-false tripping support 32.Contact supporter 20 and spring leaf 28 connect to form reset circuit with the input phase line; Left and right moving contact 21 and contact 22 form the normally-open normally-close contact with the input fixed contact; When trip coil get electric after, coil and iron core form magnetic field, so left and right moving contact 21 and contact 22 form moving contacts and are connected with fixed contact and load are exported power after 23 moments of armature plate and iron core closure; Rivet 17,18, its effect are that contact supporter 20 and left and right moving contact 21 are riveted tightly; Tension effect when spring leaf 28 has been dropout.
Moment, start-up circuit 9 utilized the power supply phase lines that first alternating voltage 120V is provided, through resistance R 1 current limliting, diode D2 halfwave rectifier, capacitor C 1 filtering, provide moment starting resistor, make the left side on the armature plate 23, right 21 moments of moving contact and contact are closed, its normally-closed contact moment is converted to normally opened contact and finishes moment start-up circuit action, then the second supply terminals provides about direct current 30V to the work of adhesive holding circuit, by diode D1 halfwave rectifier, resistance R 1, the R2 current limliting, capacitor C 1 filtering, provide the about 30V of a DC left and right sides voltage to trip coil, make trip coil produce permanent the remaining closed of field drives moving contact, make the output load that electricity be arranged, only have when artificial Leaked Current of Line to Ground or normal Leaked Current of Line to Ground exceed when a threshold value is set trip coil just dead electricity finish the action of threading off.And the fault current between these fault current detection electric circuit inspection two power lines and this fault current send a signal to this integrated amplifier 10 during greater than a threshold value.To release control circuit 13, the control release moves by this integrated amplifier output first signal; This neutrality misconnection ground circuit 12 detects neutral misconnection ground, forms sine-wave oscillator with this fault current detection circuit 11 and integrated amplifier, causes these integrated amplifier 10 output secondary signals to release control circuit 13, controls this release action.In the fault current detection circuit 11, two power line L and N pass magnetic test coil T1 simultaneously, utilize magnetic test coil detect these two power lead currents vector and, the action of control relay mechanism (abbreviation tripping coil), this vector and be zero during the fault-free electric current at ordinary times, when fault current is arranged, this vector and non-vanishing, when fault current increases to a threshold value, magnetic test coil can induce a corresponding voltage signal, this signal is after integrated amplifier amplifies, if when this signal reaches setting threshold, integrated amplifier 5 pin will be exported triggering signal, make controlled silicon conducting, the trip coil dead electricity makes release thread off in setting time, and neutral grounding fault creepage protecting plug (GFCI) disconnects; Neutral misconnection ground circuit consists of transformer coupled its by magnetic test coil and neutral misconnection ground protection coil and has the sine-wave oscillator of certain frequency of oscillation, when having neutral misconnection ground phenomenon to occur, this oscillator starting of oscillation, when amplitude reaches the integrated amplifier threshold value, the 5 pin output triggering signal of integrated amplifier, make the release action, neutral grounding fault creepage protecting plug (GFCI) disconnects; The release control circuit is controlled the "on" position of trip coil by a controllable silicon, thus the action of control relay release.
Described housing 2 is provided with reset button and feeler switch, wherein reset button and feeler switch upper end is furnished with waterproof jacket, two kinds of function key lower ends all rely on mutually with the back of circuit board soft contact normally finishes reset button and test function action, non-loaded output when powering from output, have reverse mis-wired defencive function, just can finish above various function when only having from supplying power for input end; This reset button is provided with electronics momentary reset function and adhesive keeps function, and electronics momentary reset function must make normally-closed contact moment disconnection can finish adhesive maintenance function; Be connected with test circuit after this feeler switch is pressed, this test circuit sends fault-signal to this neutral grounding fault creepage protecting plug.
Also be provided with the adhesive maintaining body that resets on the described housing 2, it is characterized in that, this reset button is pressed rear power supply phase line, and to provide quantitative electric current by the R1 current-limiting resistance be direct current by D2 diode halfwave rectifier, and through C1 capacitor filtering confession trip coil head end, and R1, D2, C1, be the moment start-up circuit, (be converted to normally opened contact by normally-closed contact moment and finish moment start-up circuit action).Adhesive holding circuit 8 is by diode D1 halfwave rectifier, resistance R 3, R4 current limliting, capacitor C 1 filtering, provides about the about 30V of the second dc voltage and supplies with trip coil, the 23 permanent adhesive work of holding armature sheet.
Described circuit board control circuit 1 comprises integrated amplifier 10, and the DC power supply 7 that is electrically connected with integrated amplifier respectively, moment start-up circuit 9, adhesive holding circuit 8, fault current detection circuit 11, neutral misconnection ground circuit 12 and release control circuit 13; When this fault current detection circuit 11 detects fault current between two power lines and fault current greater than a threshold value, send a signal to this integrated amplifier 10, to release control circuit 13, the control relay mechanism action is threaded off by these integrated amplifier 10 output first signals; This neutrality misconnection ground circuit 12 detects neutral misconnection ground, forms sine-wave oscillator with this fault current detection circuit 11 and integrated amplifier 10, causes integrated amplifier output secondary signal to the release control circuit, the action of control release.
Described fault current detection circuit 11 comprises the magnetic test coil that passes simultaneously two power lines, these magnetic test coil two ends and C7 Capacitance parallel connection, the one end is connected with the second capacitor C 6, and the C6 other end is connected with resistance R 7, and the other end of R7 resistance is connected with integrated amplifier 10.
Described neutral misconnection ground circuit 12 is by the neutral misconnection ground protection coil that passes two power lines; the second capacitor C 4 and the 3rd capacitor C 5 consist of; two ends and second Capacitance parallel connection of this neutrality misconnection ground protection coil; the one end is connected with the 3rd capacitor C 5; other end ground connection, the other end of the 3rd capacitor C 5 is connected with integrated amplifier.
Described release control circuit 13 comprises thyristor, and an end of this trip coil is connected with controllable silicon anode current-limiting protection resistance, the other end and controllable silicon minus earth, and this SCR control utmost point is connected with integrated amplifier 10.
Described armature plate 23 afterbodys are designed with the false action-proof resetting device, and relay moving contact 21 is in normally open with armature plate 23 at ordinary times, and the anti-error card tip blocks the armature plate afterbody and can not reset by mistake, only has when normally resetting and can finish reset function.
Claims (4)
1. neutral grounding fault creepage protecting plug; it is characterized in that: it is by housing (2); be positioned at the circuit board control circuit (1) of housing; the control relay circuit mechanism (3) that is positioned at housing forms; circuit board control circuit (1) is comprised of governor circuit (5) and auxiliary circuit (6): this governor circuit is again by DC power supply (7); adhesive holding circuit (8); moment, start-up circuit (9) three parts formed; auxiliary circuit is again by integrated amplifier (10); fault current detection circuit (11); neutral misconnection ground circuit (12); release control circuit (13) four parts form
DC power supply (7) consists of half-wave rectifying circuit by diode D1, the alternating current of input is become the direct current of output, diode D1 negative pole is connected with current-limiting resistance R2 one end, the current-limiting resistance R2 other end and filter capacitor C2 be anodal is connected pin and is connected with integrated amplifier, provide integrated amplifier supply power voltage DC/26V, wherein filter capacitor C2 negative pole and integrated amplifier 4 pin difference ground connection; Adhesive holding circuit (8) is connected with diode D1 is anodal by the power supply phase line, alternating current is become direct current, diode D1 negative pole is connected with current-limiting resistance R3 one end, the current-limiting resistance R3 other end is connected with current-limiting resistance R4 one end, the current-limiting resistance R4 other end and 1 anodal connection of capacitor C, send eliminating the direct current that exchanges repercussions into L1 trip coil head end, the L1 coil end is connected with ground wire; Moment start-up circuit (9) is connected with phase line by reset button S1 normally-closed contact one end, the S1 other end is connected with the R1 current-limiting resistance, the R1 other end and diode D2 positive pole connect and compose half-wave rectifying circuit, and D2 negative pole and C1 positive pole connect and compose filter circuit, send eliminating about the direct current second voltage DC/30V that exchanges repercussions into L1 trip coil head end, and L1 coil end ground connection; Integrated amplifier (10) is neutral grounding fault creepage protecting plug (GFCI) application-specific integrated circuit (ASIC), and its model: RV4145AN is called for short the IC chip, and this chip belongs to single operational amplifier; Fault current detection circuit (11) is that the input power wire is penetrated magnetic test coil T1 simultaneously, two output shunt capacitance C7 of magnetic test coil T1, one end series capacitance C6 of magnetic test coil, the C6 other end is connected with resistance R 7, the other end of R7 is connected with the input of integrated amplifier 1 pin, 3 pin of the other end of magnetic test coil and integrated amplifier connect and compose transformer coupled differential input circuit, wherein R6 is feedback resistance, resistance R 6 one ends are connected with integrated amplifier 1 pin, the other end is connected with integrated amplifier output 7 pin, the resistance size of R6 determines the multiplication factor of integrated amplifier 3 pin, namely determines the size of neutral grounding fault creepage protecting plug (GFCI) dropout action failure current value; Neutral misconnection ground circuit (12) is to pass neutral misconnection ground protection coil T2 by the power supply source neutral conductor, T2 shunt capacitance C4, the end of T2 is connected with capacitor C 5, the other end ground connection of T2, capacitor C 5 other ends are connected with integrated amplifier 7 pin outputs, neutral misconnection ground protection coil T2, magnetic test coil T1 consists of the sine-wave oscillator of transformer coupled corresponding frequency of oscillation, when having neutral misconnection ground phenomenon to occur, this oscillator starting of oscillation, when amplitude reaches the threshold values of integrated amplifier (10), the 5 pin output triggering signal of integrated amplifier (10), the release action, neutral grounding fault creepage protecting plug (GFCI) moving contact disconnects, namely by neutral misconnection ground protection coil T2, integrated amplifier (10), magnetic test coil T1 forms sinusoidal wave amplifier jointly, when neutral grounding fault creepage protecting plug (GFCI) neutral output terminal line is grounded, magnetic test coil T1, coil T2, integrated amplifier (10) and respective element are grounded the loop and connect, cause positive feedback effect to occur, until circuit vibrates, when the oscillating voltage peak value meets or exceeds the previous peaks of controllable silicon SCR trigger comparator, controllable silicon SCR output can raise, when reaching set point, the controllable silicon SCR conducting, release action moment open circuit, coil T2, C4, the C5 frequency of oscillation is higher than sine-wave oscillation frequency, thereby guarantees the loop gain of oscillator; Release control circuit (13) is by trip coil L1; controllable silicon SCR; diode D3 and capacitor C 3 consist of; the wherein end of trip coil L1 and resistance R 5; the series connection of controllable silicon SCR anode; the controllable silicon SCR control utmost point and diode D3; integrated amplifier output 5 pin connect; the controllable silicon SCR minus earth; an anti-interference capacitor C3 in parallel between the controllable silicon SCR control utmost point and ground; magnetic test coil T1 detect two power lines by the vector of electric current and; this vector and be zero during the fault-free electric current at ordinary times; when fault current is arranged; this vector and non-vanishing; when fault current increases to the setting threshold values; magnetic test coil can induce a corresponding voltage swing signal; and in 5 pin of integrated amplifier output triggering signal; after the D3 halfwave rectifier, make the controllable silicon SCR conducting; trip coil L1 is charged; release is threaded off in setting time cut off power supply; feeler switch S2; test resistance R8 consists of a test circuit; wherein; test resistance R8 is connected with power end; the R8 other end is connected with feeler switch S2; the feeler switch other end is connected with the other end of load; test circuit is to provide fault current about 8mA to neutral grounding fault creepage protecting plug (GFCI); make regular check on neutral grounding fault creepage protecting plug (GFCI) operating state; power end piezo-resistance MOV in parallel; when suddenly high voltage being arranged in the power supply; but transient absorption high voltage; and MOV resistance instantaneous variation is infinitely great; play the effect of protective circuit plate; output has LED light to monitor; wherein the LED light circuit is by halfwave rectifier diode D4 rectification; alternating current is become DC direct current 120V; provide LED light anodal about dc voltage after resistance R 9 current limlitings is for 3V, LED light negative pole and output head grounding are when neutral grounding fault creepage protecting plug (GFCI) when normally exporting; LED light is luminous
The anti-movable pressure handle of false tripping (29) is connected with armature plate (23) afterbody; Anti-false tripping spring (30) upper end is connected with armature plate (23) afterbody, and the lower end is connected with the relay base hook; Anti-false tripping rivet (31) is connected with anti-false tripping support (32), and contact supporter (20) and spring leaf (28) connect to form reset circuit with the input phase line; Left and right moving contact (21) and contact (22) form the normally-open normally-close contact with the input fixed contact; When trip coil get electric after, coil and iron core form magnetic field, so left and right moving contact (21) and contact (22) form moving contact and are connected with fixed contact and load are exported power after armature plate (23) moment and iron core closure; Rivet (17,18), its effect are that contact supporter (20) and left and right moving contact (21) are riveted tightly; Tension effect when spring leaf (28) has been dropout,
Moment start-up circuit (9) utilizes the power supply phase line that first alternating voltage 120V is provided, through resistance R 1 current limliting, diode D2 halfwave rectifier, capacitor C 1 filtering, provide moment starting resistor, make the left side on the armature plate (23), right moving contact (21) moment and contact are closed, its normally-closed contact moment is converted to normally opened contact and finishes moment start-up circuit action, then the second supply terminals provides about direct current 30V to the work of adhesive holding circuit, by diode D1 halfwave rectifier, resistance R 1, the R2 current limliting, capacitor C 1 filtering, provide the about 30V of a DC left and right sides voltage to trip coil, make trip coil produce permanent the remaining closed of field drives moving contact, make the output load that electricity be arranged, only have when artificial Leaked Current of Line to Ground or normal Leaked Current of Line to Ground exceed when a threshold value is set trip coil just dead electricity finish the action of threading off, and the fault current between these fault current detection electric circuit inspection two power lines and this fault current are during greater than a threshold value, send a signal to this integrated amplifier (10), to release control circuit (13), the control release moves by this integrated amplifier output first signal; This neutrality misconnection ground circuit (12) detects neutral misconnection ground, form sine-wave oscillator with this fault current detection circuit (11) and integrated amplifier (10), cause this integrated amplifier (10) output secondary signal to release control circuit (13), control this release action, in the fault current detection circuit (11), two power line L and N pass magnetic test coil T1 simultaneously, utilize magnetic test coil detect these two power lead currents vector and, the action of control relay mechanism, this vector and be zero during the fault-free electric current at ordinary times, when fault current is arranged, this vector and non-vanishing, when fault current increases to a threshold value, magnetic test coil can induce a corresponding voltage signal, this signal is after integrated amplifier amplifies, when if this signal reaches setting threshold, integrated amplifier 5 pin will be exported triggering signal, make the controllable silicon SCR conducting, the trip coil dead electricity, release is threaded off in setting time, and neutral grounding fault creepage protecting plug (GFCI) disconnects; Neutral misconnection ground circuit consists of transformer coupled its by magnetic test coil and neutral misconnection ground protection coil and has the sine-wave oscillator of certain frequency of oscillation, when having neutral misconnection ground phenomenon to occur, this oscillator starting of oscillation, when amplitude reaches the integrated amplifier threshold value, the 5 pin output triggering signal of integrated amplifier (10), make the release action, neutral grounding fault creepage protecting plug (GFCI) disconnects; The release control circuit is controlled the "on" position of trip coil by a controllable silicon SCR, thus the action of control relay release.
2. neutral grounding fault creepage protecting plug according to claim 1 is characterized in that:
Described housing (2) is provided with reset button and feeler switch, wherein reset button and feeler switch upper end is furnished with waterproof jacket, two kinds of function key lower ends all rely on mutually with the back of circuit board soft contact normally finishes reset button and test function action, non-loaded output when powering from output, have reverse mis-wired defencive function, just can finish above various function when only having from supplying power for input end; This reset button is provided with electronics momentary reset function and adhesive keeps function, and electronics momentary reset function must make normally-closed contact moment disconnection can finish adhesive maintenance function; Be connected with test circuit after this feeler switch is pressed, this test circuit sends fault-signal to this neutral grounding fault creepage protecting plug.
3. neutral grounding fault creepage protecting plug according to claim 1 is characterized in that:
Described housing (2) is provided with the adhesive maintaining body that resets, it is characterized in that, this reset button is pressed rear power supply phase line, and to provide quantitative electric current by the R1 current-limiting resistance be direct current by D2 diode halfwave rectifier, and through C1 capacitor filtering confession trip coil head end, and R1, D2, C1, be the moment start-up circuit, adhesive holding circuit (8) provides about the about 30V of the second dc voltage and supplies with trip coil, the permanent adhesive work of holding armature sheet (23).
4. neutral grounding fault creepage protecting plug according to claim 1 is characterized in that:
Described armature plate (23) afterbody is designed with the false action-proof resetting device, relay moving contact (21) is in normally open with armature plate (23) at ordinary times, the anti-error card tip blocks the armature plate afterbody and can not reset by mistake, only has when normally resetting and can finish reset function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810000037 CN101478099B (en) | 2008-01-04 | 2008-01-04 | Neutral grounding fault creepage protecting plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810000037 CN101478099B (en) | 2008-01-04 | 2008-01-04 | Neutral grounding fault creepage protecting plug |
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| Publication Number | Publication Date |
|---|---|
| CN101478099A CN101478099A (en) | 2009-07-08 |
| CN101478099B true CN101478099B (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200810000037 Expired - Fee Related CN101478099B (en) | 2008-01-04 | 2008-01-04 | Neutral grounding fault creepage protecting plug |
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| CN102354947B (en) * | 2011-09-22 | 2013-01-23 | 常熟市天银机电股份有限公司 | Leakage protection device with protection function in case of live grounding wire |
| CN103500984B (en) * | 2013-10-08 | 2016-09-07 | 长城电器集团有限公司 | Circuit of miniature residual current circuit breaker |
| CN104143812A (en) * | 2014-07-30 | 2014-11-12 | 黄华道 | Electric leakage detection protection circuit |
| CN105977907B (en) * | 2016-01-08 | 2019-01-11 | 上海蕴原电器有限公司 | Electricity-saving type ground-fault interrupter |
| CN106229942A (en) * | 2016-09-30 | 2016-12-14 | 中山市拓昊电器有限公司 | A kind of control circuit of earth leakage protective device |
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| CN106443305A (en) * | 2016-11-09 | 2017-02-22 | 广东盈科电子有限公司 | Electric leakage detection circuit of alternating current and detection method |
| CN109390730B (en) * | 2017-08-14 | 2024-02-27 | 苏州益而益电器制造有限公司 | Leakage protection plug |
| CN109004621A (en) * | 2018-08-08 | 2018-12-14 | 山东超越数控电子股份有限公司 | A kind of low-power consumption leakage protection circuit for AC electric current |
| CN108962697B (en) * | 2018-09-19 | 2023-10-03 | 余姚市嘉荣电子电器有限公司 | Leakage protector |
| EP3985708A1 (en) * | 2020-10-16 | 2022-04-20 | ABB Schweiz AG | Current breaker device |
| CN113541089B (en) * | 2021-06-09 | 2024-02-09 | 深圳南云微电子有限公司 | Neutral line grounding protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2193602Y (en) * | 1994-05-20 | 1995-03-29 | 上海立新电器厂 | Current leakage protecting socket |
| CN200950533Y (en) * | 2006-09-12 | 2007-09-19 | 上海益而益电器制造有限公司 | Leakage detection protective circuit |
| CN201142470Y (en) * | 2008-01-04 | 2008-10-29 | 创奇科技有限公司 | Neutral grounding fault creepage protecting plug |
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2008
- 2008-01-04 CN CN 200810000037 patent/CN101478099B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2193602Y (en) * | 1994-05-20 | 1995-03-29 | 上海立新电器厂 | Current leakage protecting socket |
| CN200950533Y (en) * | 2006-09-12 | 2007-09-19 | 上海益而益电器制造有限公司 | Leakage detection protective circuit |
| CN201142470Y (en) * | 2008-01-04 | 2008-10-29 | 创奇科技有限公司 | Neutral grounding fault creepage protecting plug |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101478099A (en) | 2009-07-08 |
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