CN103337830B - The safe earth leakage protective device that a kind of fail-safe lost efficacy - Google Patents
The safe earth leakage protective device that a kind of fail-safe lost efficacy Download PDFInfo
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- CN103337830B CN103337830B CN201310235037.8A CN201310235037A CN103337830B CN 103337830 B CN103337830 B CN 103337830B CN 201310235037 A CN201310235037 A CN 201310235037A CN 103337830 B CN103337830 B CN 103337830B
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Abstract
The present invention relates to the safe earth leakage protective device that a kind of fail-safe lost efficacy.The technical method adopted: maintain normal open locking and mistake by the dividing potential drop of zero sequence current mutual inductor secondary coil in series resistance and hold and to lock and logic control circuit is in normal open state, control driving executive circuit connection load alternating current source; Trigger normal open locking and mistake with the electric leakage signal voltage of zero sequence current mutual inductor secondary coil induction to hold and to lock and logic control circuit is in cut-off state, positive drive executive circuit cuts off load alternating current source, realizes earth leakage protective control; Hold the lowest limit with mistake and lock circuit and logic control circuit and monitor zero sequence current mutual inductor secondary coil broken string and open a way in circuit somewhere or the abnormal failure such as short circuit; and carry out losing holding and lock or the safety protection control of locking cut-off, positive drive executive circuit cuts off the AC power of load.Thus, the present invention can avoid or prevent electric shock accidents during self abnormal failure, personal safety when guaranteeing electricity consumption.
Description
Technical field
The present invention relates to a kind of electric shock or earth leakage protective device, particularly the safe earth leakage protective device that lost efficacy of a kind of fail-safe.Its characteristic is: the safety protection control not only carrying out locking power-off when normal work to the electric leakage of AC load (electrical appliance) or electric shock; and when himself there is common abnormal failure; also can reliably carry out in time locking or locking cut-off protecting control; the AC power of forced release AC load (electrical appliance); AC load (electrical appliance) and electric consumer are placed in safe condition; can avoid or prevent electric shock accidents during self abnormal failure, personal safety when guaranteeing electricity consumption.Thus, the present invention is the earth leakage protective device of a kind of " internal safety ", and its excellent properties has important practical value and social benefit; Also the amendment upgrading of this technical field national technical standard can be promoted.
Background technology
In order to examine novelty of the present invention, designer has consulted a large amount of correlation technique data (professional book, newpapers and periodicals), also retrieved Patents document.Existing old-fashioned earth leakage protective device is of a great variety; all substantially, available protecting control can be carried out to the electric leakage of AC load (electrical appliance) or electric shock when normal; but generally potential fatal defect: if when abnormal failure occurs for himself; its defencive function will lose efficacy and form jumping of refusing out of control; meet electric leakage or get an electric shock and can not cut off the AC power of AC load (electrical appliance) in time, also just can not protect electric shock person's safety.In reality, any electronic product is again abnormal failure can occur unavoidably, and such as: the secondary coil of zero sequence current mutual inductor H and tripping coil are that broken string or short trouble the most easily occur, or open circuit occurs in circuit somewhere or short trouble is also common.Now, meeting leakage current signal can not trigger control circuit action and being formed refuse to jump, and can not cut off load supplying in time, lose leakage protection, this is this field unheeded technical barrier of a specified duration.Therefore, whether existing earth leakage protective device all only has and arranges test button and check its safety protection function effective, and warns user's periodic inspection effect.Vacation that this just allows partial function lose efficacy peace earth leakage protective device, at electric online operation, to lie dormant fatal danger to the person but in actual use, user often ignores or forgets or be inconvenient to carry out validity check! On the contrary, people also think that it is safely and effectively by mistake, so existing old-fashioned earth leakage protective device, when extraordinary failure, electric shock casualty accident easily occurs.
Summary of the invention
The present invention mainly solves existing old-fashioned control circuit of earth leakage, often loses efficacy out of control because of self abnormal failure, and can not cut off load supplying in time, there is the technical problem of potential safety hazard, serious threat personal safety; There is provided a kind of when abnormal failure occurs for itself; also can reliably carry out in time locking or locking cut-off protecting control; force the AC power disconnecting AC load (electrical appliance), that get an electric shock when can avoid and prevent abnormal failure to lose efficacy, new-type " internal safety " earth leakage protective device.
The thinking and countermeasure that the present invention solves the problems of the technologies described above is: maintain normal open locking and mistake by the dividing potential drop of zero sequence current mutual inductor secondary coil in series resistance and hold and to lock and logic control circuit is in normal open state, control to drive executive circuit to connect loaded work piece power supply; Trigger normal open locking and mistake with the electric leakage signal voltage of zero sequence current mutual inductor secondary coil induction to hold and to lock and logic control circuit is in cut-off state, positive drive executive circuit cuts off loaded work piece power supply, realizes earth leakage protective control; Hold the lowest limit with mistake and lock circuit and logic control circuit and monitor zero sequence current mutual inductor secondary coil broken string and the abnormal failure such as circuit somewhere open circuit or short circuit, and carry out mistake and hold inverse-locking protection and control, positive drive executive circuit cut-out AC load working power.
The present invention is according to above-mentioned technical thought and method, the technical measures taked or technical scheme are: the present invention includes zero sequence current mutual inductor H, ac buck commutating DC stabilized voltage power supply (7), executive circuit (8), it is characterized in that: also comprise normally and to maintain and signal deteching circuit (1), up and down base limit arranges circuit (2), the upper exclusive circuit (3) of low normal open/height, mistake hold that the lowest limit arranges circuit (4), maintenance normal open/mistake is held and locked circuit (5), logic control circuit and drive circuit (6); Described normally maintenance and the signal input part V of signal deteching circuit (1)
i1and V
i2connect the secondary coil n of zero sequence current mutual inductor H
3two ends, the signal output part of normally maintenance and signal deteching circuit (1) connects the signal input part (V of exclusive circuit (3) on low normal open/height
i) and maintain normal open/mistake hold the signal input part (V locking circuit (5)
i), normally maintains and the positive source of signal deteching circuit (1) connects ac buck commutating DC stabilized voltage power supply (7) the direct current power source voltage V that exports
+ 2or V
+ 1; The described limit of base up and down arranges the feedback input end connection logic control circuit of circuit (2) and the feedback output end (V of drive circuit (6)
f), upper and lower base limit arranges the base limit output (V of circuit (2)
h/ V
l) connect the base limit input (V of exclusive circuit (3) on low normal open/height
z/ V
m), upper and lower base limit arranges the power input (V of circuit (2)
r) connect maintain normal open/mistake hold the output (V locking circuit (5)
c/ V
e/ BER), upper and lower base limit arranges the power input (V of circuit (2)
r) or connect ac buck commutating DC stabilized voltage power supply (7) the direct current power source voltage V that exports
+ 1; Output (the V of exclusive circuit (3) on described low normal open/height
o/ V
q) connect an input of logic control circuit and drive circuit (6); Described mistake is held the lowest limit and is arranged circuit (4) lowest limit input (V
d) connect normally and maintain and the abnormality detection end (V of signal deteching circuit (1)
t), or described mistake is held the lowest limit and is arranged circuit (4) lowest limit input (V
d) the external output (V connecting exclusive circuit (3) on low normal open/height
o/ V
q), or described mistake is held the lowest limit and is arranged circuit (4) lowest limit input (V
d) connect maintain normal open/mistake hold the output (V locking circuit (5)
c/ V
e/ BER), lose hold lowest limit output that the lowest limit arranges circuit (4) connect maintain normal open/mistake hold lock circuit (5) lock control end (V
s); Output (the V locking circuit (5) is held in described maintenance normal open/mistake
c/ V
e/ BER) also connect another input of logic control circuit and drive circuit (6); Described logic control circuit and drive circuit (6) output (V
j) connecting the input of executive circuit (8), logic control circuit and drive circuit (6) positive source connect the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3; The direct current power source voltage V that described ac buck commutating DC stabilized voltage power supply (7) exports
+ 1connect exclusive circuit (3) and mistake on low normal open/height hold the lowest limit arrange circuit (4) and maintain normal open/mistake hold the power positive end locking circuit (5), the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3> V
+ 2> V
+ 1, two ac power input ends of ac buck commutating DC stabilized voltage power supply (7) are connected to the AC load side two alternating current wires L of alternating-current switch or relay normally open contact J
1, N
1on; The output of described executive circuit (8) or relay normally open contact J control the logical and disconnected of the AC power of controlled AC load; QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load; The secondary coil n of described zero sequence current mutual inductor H
3only belong to sequence mode through the indirect sequential control executive circuit (8) of intermediate circuit link, or the secondary coil n of zero sequence current mutual inductor H
3not only through the indirect sequential control of intermediate circuit link but also directly series connection controls executive circuit (8) and belongs to multiple prosecutor formula.
Circuit block diagram operation principle of the present invention is as follows:
1, after manually pressing start button QD, the normally opened contact J of executive circuit (8) output maintains attracting state, continues to connect AC power, and earth leakage protective device system, control circuit and controlled AC load (electrical appliance) thereof obtain electric work.When circuit normally works, maintained by normally and V in signal deteching circuit (1)
i1, V
i2normal open maintain current potential and maintain through the relay that sequence mode or multiple prosecutor formula control executive circuit (8) that attracting state powers to AC load (electrical appliance).As the secondary coil n of zero sequence current mutual inductor H
3output signal when being zero or less, normally maintains and signal deteching circuit (1) holds the input (V locking circuit (5) to exclusive circuit (3) on low normal open/height and maintenance normal open/mistake
i) current potential lower than base limit end (V is set
z/ V
m) lower base spacing and higher than the lowest limit, make the output (V of exclusive circuit (3) on low normal open/height
o) and maintain normal open/mistake hold the output (V locking circuit (5)
c) export maintenance normal open signal to logic control circuit and drive circuit (6), and then promote executive circuit (8) connection load interchange (electrical appliance) AC power, circuit system is entered and maintains conducting state normally.
2, when AC load (electrical appliance) leakage current exceedes setting, the secondary coil n of zero sequence current mutual inductor H is made
3when the AC signal exported is larger, normally maintenance and signal deteching circuit (1) is made to hold the input (V locking circuit (5) to exclusive circuit (3) on low normal open/height and maintenance normal open/mistake
i) the current potential upper base that arranges circuit (2) higher than upper and lower base limit is spacing, make locking upset on exclusive circuit (3) height on low normal open/height, direct or indirect output locking pick-off signal is to logic control circuit and drive circuit (6), also make mistake hold the lowest limit to arrange circuit (4) and maintain normal open/mistakes and hold and lock circuit (5) to logic control circuit and drive circuit (6) output locking pick-off signal, and then force executive circuit (8) to disconnect AC load (electrical appliance) power supply, make circuit system enter safe locking off-position.
3, as the secondary coil n of the zero sequence current mutual inductor H of input
3when broken string or short circuit, normally maintenance and signal deteching circuit (1) can be made to hold the input (V locking circuit (5) to exclusive circuit (3) on low normal open/height and maintenance normal open/mistake
i) current potential holds the lowest limit lower than mistake and arrange the mistake that circuit (4) arranges and hold the lowest limit, maintenance normal open/mistake is held and locks circuit (5) output (V
c) export mistake hold block signal to logic control circuit and drive circuit (6), and logic control circuit and drive circuit (6) output abnormality pick-off signal again, and then force executive circuit (8) to disconnect AC load (electrical appliance) power supply, make circuit system enter safe locking off-position because of outside abnormal failure.
4, when being maintained by normally and signal deteching circuit (1), upper and lower base limit arranges circuit (2), exclusive circuit (3) on low normal open/height, mistake is held the lowest limit and is arranged circuit (4), maintenance normal open/mistake is held and is locked circuit (5), it is unsettled to there is open circuit in the safe own somewhere of leakage protection circuit system that logic control circuit and drive circuit (6) form, or short circuit, or during the abnormal failure such as device failure, due to the backup arranged side by side of safe leakage protection circuit internal system, logical interlock supervisory function bit, also logic control circuit and drive circuit (6) output abnormality locking pick-off signal is still made, and then force executive circuit (8) to disconnect AC load (electrical appliance) power supply, safe leakage protection circuit system itself is made to enter safe locking off-position because of abnormal failure.
Therefore, the invention has the beneficial effects as follows:
Not only can carry out the safety protection control of locking power-off to the electric leakage of AC load (electrical appliance) or electric shock when normal work; and when himself there is common abnormal failure; also can reliably carry out in time locking or locking cut-off protecting control; the AC power of forced release AC load (electrical appliance); AC load (electrical appliance) and electric consumer are placed in safe condition; can avoid or prevent electric shock accidents during self abnormal failure, personal safety when guaranteeing electricity consumption.Thus, the present invention is the earth leakage protective device of a kind of " internal safety ", and its excellent properties has important practical value and social benefit; Also the amendment upgrading of this technical field national technical standard can be promoted.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is the physical circuit schematic diagram of the embodiment of the present invention 1.
Fig. 3 is the physical circuit schematic diagram of the embodiment of the present invention 2.
Fig. 4 is the physical circuit schematic diagram of the embodiment of the present invention 3.
Fig. 5 is the physical circuit schematic diagram of the embodiment of the present invention 4.
In Fig. 1: (1) is normally maintenance and signal deteching circuit, (2) be the spacing circuit that arranges up and down, (3) for maintaining normal open, amplifying and touch lock circuit, (4) hold the lowest limit for mistake and circuit is set, (5) hold lock circuit for maintaining normal open/mistake, (6) be logic control circuit and drive circuit, (7) be ac buck commutating DC stabilized voltage power supply, (8) be executive circuit, H is zero sequence current mutual inductor.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
The schematic block circuit diagram of embodiment 1 ~ 4, as shown in Figure 1: (1) is normally maintenance and signal deteching circuit, (2) be the spacing circuit that arranges up and down, (3) for maintaining normal open, amplifying and touch lock circuit, (4) hold the lowest limit for mistake and circuit is set, (5) hold lock circuit for maintaining normal open/mistake, (6) be logic control circuit and drive circuit, (7) be ac buck commutating DC stabilized voltage power supply, (8) be executive circuit, H is zero sequence current mutual inductor.
The physical circuit schematic diagram of embodiment 1, as shown in Figure 2.The present embodiment also comprises special complete stable control integrated circuit 2WKD; Two are had to input separate unit circuit in parallel, to export separately complementation, the forward output (V of its first separate unit circuit in described special complete stable control integrated circuit 2WKD
o1) and the inverse output terminal (V of the second separate unit circuit
o2) direct tandem drive small-power executive circuit (8), or by triode 2TV
1, 2TV
2with voltage-stabiliser tube 2WD
1, 2WD
2and resistance 2R
7, 2R
8the drive circuit of peripheral discrete component composition drives high-power executive circuit (8), and described small-power executive circuit (8) is by relay 2J
1, diode 2D
1, 2D
2form, described high-power executive circuit (8) is by relay 2J, diode 2D
3form; In described special complete stable control integrated circuit 2WKD, each separate unit circuit is maintained by described normally and signal deteching circuit (1), up and down base are limit and arranged circuit (2), the upper exclusive circuit (3) of low normal open/height, lose and hold that the lowest limit arranges circuit (4), maintenance normal open/mistake is held and locked circuit (5), logic control circuit and drive circuit (6), outer distribution resistance 2R
mcomposition, or the circuit replacement anti-out of control that each separate unit circuit coordinates a small amount of peripheral discrete component to form by general simulation integrated operational amplifier or voltage comparator or digital circuit or Single Chip Microcomputer (SCM) program control circuit.
The physical circuit connected mode of embodiment 1: described zero sequence current mutual inductor H secondary coil 2n
3one end 2V
i1be connected to the signal input part (V of special complete stable control integrated circuit 2WKD
i), zero sequence current mutual inductor H secondary coil 2n
3other end 2V
i2the lowest limit being connected to special complete stable control integrated circuit 2WKD arranges end (V
d/ V
t); Positive source (the V of described special complete stable control integrated circuit 2WKD
cc) meet direct current power source voltage V
+ 1, the earth terminal (GND) of special complete stable control integrated circuit 2WKD connects the earth terminal (GND) of ac buck commutating DC stabilized voltage power supply (7); Forward output (the V of special complete stable control integrated circuit 2WKD
o1) internally connect and maintain normal open/mistake and hold the output (V locking circuit (5)
c/ V
e/ BER), the inverse output terminal (V of special complete stable control integrated circuit 2WKD
o2) the internal output (V connecting exclusive circuit (3) on low normal open/height
o/ V
q), the base limit of special complete stable control integrated circuit 2WKD arranges end (V
z/ V
m) to earth terminal (GND) guest performer resistance 2R
m, in order to regulate or to change the trigger sensitivity of exclusive circuit (3) on the inner low normal open/height of special complete stable control integrated circuit 2WKD; Inverse output terminal (the V of special complete stable control integrated circuit 2WKD
o2) to voltage stabilizing didoe 2WD
2negative pole series resistor 2R
7, voltage stabilizing didoe 2WD
2positive pole meet triode 2TV
2base stage, triode 2TV
2emitter be connected with earth terminal (GND), triode 2TV
2collector electrode be connected on diode 2D
3positive pole, relay 2J coil two ends are attempted by diode 2D
3positive pole and negative pole, diode 2D
3negative pole connecting triode 2TV
1collector electrode; Forward output (the V of special complete stable control integrated circuit 2WKD
o1) connecting resistance 2R
8or diode 2D
1negative pole, resistance 2R
8another termination voltage stabilizing didoe 2WD
1positive pole, voltage stabilizing didoe 2WD
1negative pole meet triode 2TV
1base stage, triode 2TV
1emitter meet direct current power source voltage V
+ 3; Inverse output terminal (the V of special complete stable control integrated circuit 2WKD
o2) or connect diode 2D
2negative pole and relay 2J
1one end of coil, relay 2J
1the other end of coil connects diode 2D
1, 2D
2positive pole; Two ac input ends of ac buck commutating DC stabilized voltage power supply (7) are connected to relay normally open contact 2J or 2J
1aC load side two alternating current wires L
1, N
1on, the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3higher than V
+ 2, direct current power source voltage V
+ 2higher than V
+ 1, the secondary coil 2n of described zero sequence current mutual inductor H
3around the coil on its ring-shaped core, its primary coil n
1, n
2be and penetrate two AC power cord L in ring-shaped core hole
1, N
1, relay 2J or 2J
1two couples of normally opened contact 2J or 2J
1control the logical and disconnected of the AC power of controlled AC load, QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load.
The circuit working principle of embodiment 1:
After manually pressing start button QD, normally opened contact 2J or 2J of relay
1maintain attracting state, continue to connect AC power, control circuit of earth leakage system and controlled AC load (electrical appliance) thereof obtain electric work.If controlled AC load (electrical appliance) normally works, without electric leakage/getting an electric shock occurs, by AC power cord L
1, N
1on equal, the direction of size of current contrary, offsetting at the magnetic flux of zero sequence current mutual inductor H ring-shaped core internal induction is zero, therefore at zero sequence current mutual inductor H secondary coil 2n
3two ends produce without alternating current/voltage, special complete stable control integrated circuit 2WKD signal input part V
icurrent potential just in time higher than the lowest limit (V
d/ V
t) and lower than lower base limit (V
z/ V
m), make that special complete stable control integrated circuit 2WKD's lock output (V
c/ V
e) export high potential maintain base limit end (V is set
z/ V
m) to be in benchmark spacing, the forward output V of special complete stable control integrated circuit 2WKD
o1export electronegative potential and drive triode 2TV
1conducting, inverse output terminal V
o2export high potential and drive triode 2TV
2conducting, relay 2J or 2J
1coil electricity adhesive, its two couples of normally opened contact 2J or 2J
1connect the AC power of controlled AC load (electrical appliance), and maintain normal power supply state.
If controlled AC load (electrical appliance) is leaked electricity/got an electric shock, make AC power cord L
1, N
1the uneven alternating current of upper generation, produces induction magnetic flux in zero sequence current mutual inductor H annular core, therefore at zero sequence current mutual inductor H secondary coil 2n
3two ends just produce induced current/voltage signal.If signal voltage is higher than setting, to special complete stable control integrated circuit 2WKD signal input part V
icurrent potential higher than upper and lower base limit, end (V is set
z/ V
m) upper base spacing, make that special complete stable control integrated circuit 2WKD's lock output (V
c/ V
e) still export high potential, its inverse output terminal (V
o2) output low level pressure triode 2TV
2cut-off, forward output V
o1export high level and force triode 2TV
1cut-off, forces relay 2J or 2J
1coil blackout discharges, its two couples of normally opened contact 2J or 2J
1cut off the AC power of controlled AC load (electrical appliance), and maintain abnormal obliteration off-position, make electric leakage/electric shock obtain safeguard protection.
As zero sequence current mutual inductor H secondary coil 2n
3when there is disconnection fault, on the height of special complete stable control integrated circuit 2WKD inside, exclusive circuit is triggered, and makes its inverse output terminal V
o2output low level forces triode 2TV
2cut-off, forward output V
o1export high level and force triode 2TV
1end, force relay 2J or 2J
1coil blackout discharges, relay 2J or 2J
1two couples of normally opened contact 2J or 2J
1cut off the AC power of controlled AC load (electrical appliance), and maintain locking off-position, avoid the false running status of protecting that lost efficacy occurs.
When special complete stable control integrated circuit 2WKD internal components somewhere is damaged or open circuit or short circuit or secondary coil 2n occur in its 8 exit somewheres
3two ends be short-circuited fault time, the logic control circuit of special complete stable control integrated circuit 2WKD inside or mistake are held and are locked circuit and be triggered, and force the inverse output terminal V of special complete stable control integrated circuit 2WKD
o2output low level forces triode 2TV
2cut-off, forward output V
o1export high level and force triode 2TV
1cut-off, forces relay 2J or 2J
1coil blackout discharges, its two couples of normally opened contact 2J or 2J
1cut off the AC power of controlled AC load (electrical appliance), and maintain abnormal obliteration off-position, avoid the false running status of protecting that lost efficacy occurs.
Visible; embodiment 1 not only can carry out the safety protection control of locking power-off to the electric leakage of AC load (electrical appliance) or electric shock when normal work; and when himself there is common abnormal failure; also can reliably carry out in time locking or locking cut-off protecting control; the AC power of forced release AC load (electrical appliance); AC load (electrical appliance) and electric consumer are placed in safe condition; electric shock accidents when can avoid or prevent faults itself to lose efficacy, personal safety when guaranteeing electricity consumption.Thus, embodiment 1 is the earth leakage protective device of a kind of " internal safety ".
The physical circuit schematic diagram of embodiment 2, as shown in Figure 3.The present embodiment also comprises Special safety control integration circuit 3AKD; Described normally maintenance and signal deteching circuit (1) comprise the secondary coil 3n of zero sequence current mutual inductor H
3with resistance 3R
1, 3R
2, 3R
3, the described limit of base up and down arranges circuit (2) and comprises resistance 3R
4, 3R
5, 3R
6, input separate unit circuit in parallel, to export separately complementation, the forward output (V of the first separate unit circuit in core circuit with Special safety control integration circuit 3AKD for there being two in core circuit
c1) and the inverse output terminal (V of the second separate unit circuit
c2) direct tandem drive small-power executive circuit (8), or by triode 3TV
1, 3TV
2with voltage-stabiliser tube 3WD
1, 3WD
2and resistance 3R
7, 3R
8the drive circuit of peripheral discrete component composition carrys out the high-power executive circuit of tandem drive (8), and described small-power executive circuit (8) is by relay 3J
1, diode 3D
1, 3D
2form, described high-power executive circuit (8) is by relay 3J, diode 3D
3form, in described core circuit each separate unit circuit by exclusive circuit (3) described low normal open/height on, lose and hold that the lowest limit arranges circuit (4), maintenance normal open/mistake is held and locked circuit (5), logic control circuit and drive circuit (6), outer distribution resistance 3R
9composition, or the circuit replacement anti-out of control that each separate unit circuit coordinates a small amount of peripheral discrete component to form by general simulation integrated operational amplifier or voltage comparator or digital circuit or Single Chip Microcomputer (SCM) program control circuit.
The physical circuit connected mode of embodiment 2: described zero sequence current mutual inductor H secondary coil 3n
3one end 3V
i1contact resistance 3R
1one end, described zero sequence current mutual inductor H secondary coil 3n
3other end 3V
i2contact resistance 3R
2, 3R
3tie point, resistance 3R
1the other end should connect direct current power source voltage V by sequence mode
+ 2, answer connecting triode 3TV by multiple prosecutor formula
1collector electrode, resistance 3R
2other end ground connection (GND), resistance 3R
3the other end is connected to the signal input part (V of core circuit
i); Positive source (the V of described core circuit
cc) meet direct current power source voltage V
+ 1, the earth terminal (GND) of core circuit connects the earth terminal (GND) of ac buck commutating DC stabilized voltage power supply (7); Resistance 3R
4, 3R
5, 3R
6the base limit being connected to core circuit after star parallel connection arranges end (V
z/ V
m), resistance 3R
4other end ground connection (GND), resistance 3R
5another termination direct current power source voltage V
+ 1, resistance 3R
6the other end and resistance 3R
7be connected to the inverse output terminal (V of core circuit
c2) on; Resistance 3R
7another termination voltage stabilizing didoe 3WD
2negative pole, voltage stabilizing didoe 3WD
2positive pole meet triode 3TV
2base stage, triode 3TV
2grounded emitter (GND), triode 3TV
2collector electrode be connected on diode 3D
3positive pole, relay 3J coil two ends are attempted by diode 3D
3positive pole and negative pole, diode 3D
3negative pole answers connecting triode 3TV by sequence mode
1collector electrode, diode 3D
3negative pole should connect zero sequence current mutual inductor H secondary coil 3n by multiple prosecutor formula
33V
i2end; The lowest limit of described core circuit arranges end (V
d/ V
q) contact resistance 3R
9, resistance 3R
9another termination direct current power source voltage V
+ 3; Forward output (the V of described core circuit
c1) connecting resistance 3R
8or diode 3D
1negative pole, resistance 3R
8another termination voltage stabilizing didoe 3WD
1positive pole, voltage stabilizing didoe 3WD
1negative pole meet triode 3TV
1base stage, triode 3TV
1emitter be connected on direct current power source voltage V
+ 3on; Inverse output terminal (the V of described core circuit
c2) or connect diode 3D
2negative pole and relay 3J
1one end of coil, relay 3J
1the other end of coil connects diode 3D
1, 3D
2positive pole; Two ac input ends of described ac buck commutating DC stabilized voltage power supply (7) are connected to relay normally open contact 3J or 3J
1aC load side two alternating current wires L
1, N
1on, the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3higher than V
+ 2, direct current power source voltage V
+ 2higher than V
+ 1; The secondary coil 3n of zero sequence current mutual inductor H
3around the coil on its ring-shaped core, its primary coil n
1, n
2be and penetrate two AC power cord L in ring-shaped core hole
1, N
1; Relay 3J or 3J
1two couples of normally opened contact 3J or 3J
1control the logical and disconnected of the AC power of controlled AC load; QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load.
The circuit working principle of embodiment 2:
After manually pressing start button QD, normally opened contact 3J or 3J of relay
1maintain attracting state, continue to connect AC power, earth leakage protective device system, control circuit and controlled AC load (electrical appliance) thereof obtain electric work.If controlled AC load (electrical appliance) normally works, without electric leakage/getting an electric shock occurs, by AC power cord L
1, N
1on equal, the direction of size of current contrary, offsetting at the magnetic flux of zero sequence current mutual inductor H ring-shaped core internal induction is zero, therefore at zero sequence current mutual inductor H secondary coil 3n
3two ends produce without alternating current/voltage, only have secondary 3n
3the D.C. resistance of coil is serially connected in resistance 3R
1, 3R
2the DC partial voltage of upper formation drops on 3V
i1, 3V
i2two inputs, input 3V
i2through resistance 3R
3pass to Special safety control integration circuit 3AKD signal input part V
icurrent potential just in time limit lower than lower base higher than the lowest limit, make the forward output (V of Special safety control integration circuit 3AKD
c1) export electronegative potential driving triode 3TV
1conducting, inverse output terminal (V
c2) export high potential driving triode 3TV
2conducting, the adhesive of relay 3J coil electricity, its two pairs of normally opened contacts connect the AC power of controlled AC load (electrical appliance), and maintain normal power supply state.Now, the limit of base up and down of Special safety control integration circuit 3AKD arranges end V
z/ V
mbecause of feedback resistance 3R
6feedback effect be in the spacing state of base.
If controlled AC load (electrical appliance) is leaked electricity/got an electric shock, make AC power cord L
1, N
1the uneven alternating current of upper generation, produces induction magnetic flux in zero sequence current mutual inductor H annular core, therefore at zero sequence current mutual inductor H secondary coil 3n
3two ends just produce induced current/voltage signal.If signal voltage is higher than setting, to Special safety control integration circuit 3AKD signal input part V
icurrent potential surmount upper and lower base limit end (V is set
z/ V
m) upper base limit, trigger dedicated safety control integration circuit 3AKD makes its inverse output terminal (V immediately
c2) output low level pressure triode 3TV
2cut-off, forward output (V
c1) export high level pressure triode 3TV
1end, force relay 3J or 3J
1coil blackout discharges, its two couples of normally opened contact 3J or 3J
1cut off the AC power of controlled AC load (electrical appliance), and maintain abnormal obliteration off-position, make electric leakage/electric shock obtain safeguard protection.Now, the limit of base up and down of Special safety control integration circuit 3AKD arranges end (V
z/ V
m) because of feedback resistance 3R
6feedback effect be in lower base limit potential state.
As zero sequence current mutual inductor H secondary coil 3n
3when there is disconnection fault, make input 3V
i2, V
ipotential pole is low, and hold the lowest limit lower than the mistake in Special safety control integration circuit 3AKD, trigger dedicated safety control integration circuit 3AKD makes its inverse output terminal (V immediately
c2) output low level pressure triode 3TV
2cut-off, forward output (V
c1) export high level pressure triode 3TV
1end, force relay 3J or 3J
1coil blackout discharges, its two couples of normally opened contact 3J or 3J
1cut off the AC power of controlled AC load (electrical appliance), and maintain locking off-position, avoid the false running status of protecting that lost efficacy occurs.Now, the limit of base up and down of Special safety control integration circuit 3AKD arranges end (V
z/ V
m) because of feedback resistance 3R
6feedback effect be in lower base limit potential state.
When Special safety control integration circuit 3AKD internal components somewhere damage or its 8 exit somewheres occur open circuit or short circuit or signal input be short-circuited fault time, Special safety control integration circuit 3AKD inverse output terminal (V can be made
c2) output low level pressure triode 3TV
2cut-off, forward output (V
c1) export high level pressure triode 3TV
1cut-off, forces relay 3J or 3J
1coil blackout discharges, its two couples of normally opened contact 3J or 3J
1cut off the AC power of controlled AC load (electrical appliance), and maintain abnormal obliteration off-position, avoid the false running status of protecting that lost efficacy occurs.Now, and the base up and down of Special safety control integration circuit 3AKD limit end (V is set
z/ V
m) because of feedback resistance 3R
6feedback effect be in lower base limit potential state.
Visible; embodiment 2 not only can carry out the safety protection control of locking power-off to the electric leakage of AC load (electrical appliance) or electric shock when normal work; and when himself there is common abnormal failure; also can reliably carry out in time locking or locking cut-off protecting control; the AC power of forced release AC load (electrical appliance); AC load (electrical appliance) and electric consumer are placed in safe condition; can avoid or prevent electric shock accidents during self abnormal failure, personal safety when guaranteeing electricity consumption.Thus, embodiment 2 is also the earth leakage protective device of a kind of " internal safety ", and its excellent properties has important practical value and social benefit.
The physical circuit schematic diagram of embodiment 3, as shown in Figure 4.Normally maintenance described in the present embodiment and signal deteching circuit (1) comprise the secondary coil 4n of zero sequence current mutual inductor H
3, electric capacity 4C, resistance 4R
1, 4R
2with voltage-stabiliser tube 4WD
1, 4WD
2with triode 4TV
1, 4TV
2, the described limit of base up and down arranges circuit (2) and comprises resistance 4R
1, 4R
2, on described low normal open/height, exclusive circuit (3) comprises resistance 4R
1, 4R
2with diode 4D
4, 4D
5with voltage-stabiliser tube 4WD
1, 4WD
2, lose and hold the lowest limit and circuit (4) is set comprises abnormal detection circuit TDS, maintain normal open/mistakes and hold and lock circuit (5) and comprise and simulate integrated operational amplifier or voltage comparator 4A
1, 4A
2with diode 4D
1, 4D
2, resistance 4R
3, described logic control circuit and drive circuit (6) comprise triode 4TV
1, 4TV
2, the direct current power source voltage that described ac buck commutating DC stabilized voltage power supply (7) exports only needs V
+ 1; Described executive circuit (8) is by relay 4J, diode 4D
3form, executive circuit (8) or only driven separately by the 1st element circuit or the 2nd element circuit, the 1st described element circuit is by triode 4TV
1, voltage-stabiliser tube 4WD
1, diode 4D
1, resistance 4R
1with simulation integrated operational amplifier or voltage comparator 4A
1composition, the 2nd described element circuit is by triode 4TV
2, voltage-stabiliser tube 4WD
2, diode 4D
2, resistance 4R
2with simulation integrated operational amplifier or voltage comparator 4A
2composition.
The physical circuit connected mode of embodiment 3: described zero sequence current mutual inductor H secondary coil 4n
3two output 4V
i1, 4V
i2resistance 4R is serially connected in after shunt-wound capacitance 4C
1, 4R
2between, zero sequence current mutual inductor H secondary coil 4n
3output 4V
i1diode 4D is also connected as the 1st element circuit signal input part
5negative pole and simulation integrated operational amplifier or voltage comparator 4A
1inverting input and simulation integrated operational amplifier or voltage comparator 4A
2normal phase input end, zero sequence current mutual inductor H secondary coil 4n
3output 4V
i2diode 4D is also connected as the 2nd element circuit signal input part
4input (the V of positive pole and abnormal detection circuit TDS
t/ V
d); Resistance 4R
1the other end connects diode 4D
1, 4D
4negative pole and voltage-stabiliser tube 4WD
1positive pole, voltage-stabiliser tube 4WD
1negative pole connecting triode 4TV
1base stage, triode 4TV
1emitter be connected on direct current power source voltage V
+ 1on; Resistance 4R
2the other end connects diode 4D
2, 4D
5positive pole and voltage-stabiliser tube 4WD
2negative pole, voltage-stabiliser tube 4WD
2positive pole connecting triode 4TV
2base stage, triode 4TV
2grounded emitter end (GND); Triode 4TV
2collector electrode be connected on diode 4D
3positive pole, relay 4J coil two ends are attempted by diode 4D
3positive pole and negative pole, diode 4D
3negative pole connecting triode 4TV
1collector electrode; Simulation integrated operational amplifier or voltage comparator 4A
1normal phase input end and simulation integrated operational amplifier or voltage comparator 4A
2inverting input be attempted by the output (V of abnormal detection circuit TDS
s) on; Simulation integrated operational amplifier or voltage comparator 4A
1, 4A
2power positive end be connected to direct current power source voltage V
+ 1on, simulation integrated operational amplifier or voltage comparator 4A
1, 4A
2power cathode ground connection (GND); Simulation integrated operational amplifier or voltage comparator 4A
1output connect diode 4D
1positive pole and resistance 4R
3, resistance 4R
3the other end is connected to direct current power source voltage V
+ 1on; Simulation integrated operational amplifier or voltage comparator 4A
2output connect diode 4D
2negative pole; Two ac input ends of ac buck commutating DC stabilized voltage power supply (7) are connected to the AC load side two alternating current wires L of relay normally open contact 4J
1, N
1on, the direct current power source voltage that ac buck commutating DC stabilized voltage power supply (7) exports only needs V
+ 1; The secondary coil 4n of described zero sequence current mutual inductor H
3around the coil on its ring-shaped core, its primary coil n
1, n
2be and penetrate two AC power cord L in ring-shaped core hole
1, N
1, two couples of normally opened contact 4J of relay 4J control the logical and disconnected of the AC power of controlled AC load; QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load.
The circuit working principle of embodiment 3:
After manually pressing start button QD, the normally opened contact 4J of relay maintains attracting state, continues to connect AC power, and earth leakage protective device system, control circuit and controlled AC load (electrical appliance) thereof obtain electric work.If controlled AC load (electrical appliance) normally works, without electric leakage/getting an electric shock occurs, by AC power cord L
1, N
1on equal, the direction of size of current contrary, offsetting at the magnetic flux of zero sequence current mutual inductor H ring-shaped core internal induction is zero, therefore at zero sequence current mutual inductor H secondary coil 4n
3two ends produce without alternating current/voltage, only have secondary coil 4n
3d.C. resistance be serially connected in resistance 4R
1, 4R
2the DC partial voltage of upper formation drops on 4V
i1, 4V
i2two inputs, at H secondary coil 4n
3with resistance 4R
1, 4R
2in the direct current that passes through, be exactly triode 4TV
1, 4TV
2base current, regulating resistance 4R
1, 4R
2resistance just can regulate the size of this base current or voltage, and then just can regulable control triode 4TV
1, 4TV
2conducting or cut-off, finally reach adhesive or the release of control relay 4J.As zero sequence current mutual inductor H secondary coil 4n
3two ends produce without alternating current/voltage, just in time allow triode 4TV
1, 4TV
2be placed in conducting (normal open) state, the adhesive of relay 4J coil electricity, its two pairs of normally opened contacts connect the AC power of controlled AC load (electrical appliance).Now, the output potential (V of abnormal detection circuit TDS
s) lower than signal input part 4V
i1current potential, just allow simulation integrated operational amplifier or voltage comparator 4A
1output exports electronegative potential, simulation integrated operational amplifier or voltage comparator 4A
2output exports high potential, by triode 4TV
1, 4TV
2be placed in and maintain conducting (normal open) state, then maintain the normal power supply of AC load (electrical appliance).
If controlled AC load (electrical appliance) is leaked electricity/got an electric shock, make AC power cord L
1, N
1the uneven alternating current of upper generation, produces induction magnetic flux in zero sequence current mutual inductor H annular core, therefore at zero sequence current mutual inductor H secondary coil 4n
3two ends just produce induced current/voltage signal.If this AC signal voltage is higher than setting, and through diode 4D
2, 4D
5reversal, triode 4TV will be controlled
1, 4TV
2be in cut-off state, force relay 4J coil blackout to discharge, its two pairs of normally opened contacts cut off the AC power of controlled AC load (electrical appliance), and maintain abnormal obliteration off-position, make electric leakage/electric shock obtain safeguard protection.Now, integrated operational amplifier or voltage comparator 4A is simulated
1still electronegative potential is exported, simulation integrated operational amplifier or voltage comparator 4A
2still export high potential, do not affect triode 4TV
1, 4TV
2operating state.
As zero sequence current mutual inductor H secondary coil 4n
3or resistance 4R
1, 4R
2or voltage-stabiliser tube 4WD
1, 4WD
2or triode 4TV
1, 4TV
2base stage, emitter occur broken string open fault time, all can disconnect triode 4TV
1, 4TV
2base current, control triode 4TV
1, 4TV
2be in cut-off state, force relay 4J to discharge, its two couples of normally opened contact 4J cut off the AC power of controlled AC load (electrical appliance), and maintain locking off-position, avoid the false running status of protecting that lost efficacy occurs.Now, integrated operational amplifier or voltage comparator 4A is simulated
1still electronegative potential is exported, simulation integrated operational amplifier or voltage comparator 4A
2still export high potential, do not affect triode 4TV
1, 4TV
2operating state.
As zero sequence current mutual inductor H secondary coil 4n
3two ends or voltage-stabiliser tube 4WD
1positive pole and voltage-stabiliser tube 4WD
2negative pole be short-circuited fault time, make input 4V
i1, 4V
i2two input current potentials are lower than the output potential (V of abnormal detection circuit TDS
s), allow and simulate integrated operational amplifier or voltage comparator 4A
1export high potential, through diode 4D
1block triode 4TV
1base current, triode 4TV
1cut-off, simulation integrated operational amplifier or voltage comparator 4A
2export electronegative potential, through diode 4D
2miss triode 4TV
2base current, triode 4TV
2cut-off, force relay 4J coil blackout to discharge, its two couples of normally opened contact 4J cut off the AC power of controlled AC load (electrical appliance), and maintain abnormal obliteration off-position, avoid the false running status of protecting that lost efficacy occurs.
Visible, embodiment 3 not only can carry out the safety protection control of locking power-off to the electric leakage/electric shock of AC load (electrical appliance) when normal work, and at zero sequence current mutual inductor H secondary coil 3n
3when there is broken string or short trouble, also can lock the AC power of forced release AC load (electrical appliance) in time.But its performance is good not as good as embodiment 1,2, the other extraordinary failure of only a few may be there is and refuse to jump phenomenon.Thus, embodiment 3 is the earth leakage protective devices of a kind of " security performance is poor ".But, its circuit structure is simple, cost is low, can to assemble with common components and parts be its advantage.
The physical circuit schematic diagram of embodiment 4, as shown in Figure 5.The present embodiment also comprises special more end countercharge integrated circuit 5FKD; Described normally maintains and signal deteching circuit (1) comprises zero sequence current mutual inductor H secondary coil 5n
3with resistance 5R
1, 5R
2, 5R
3, the described limit of base up and down arranges circuit (2) and comprises resistance 5R
4, 5R
5, 5R
6, exclusive circuit (3) on described low normal open/height, lose hold the lowest limit circuit (4) is set, maintain normal open/mistakes hold lock circuit (5), logic control circuit and drive circuit (6), outer distribution hinders 5R
9, 5R
10form special more end countercharge integrated circuit 5FKD, or coordinate a small amount of peripheral discrete component to form the special more end by general simulation integrated operational amplifier or voltage comparator or digital circuit or Single Chip Microcomputer (SCM) program control circuit to countercharge integrated circuit 5FKD, described logic control circuit and drive circuit (6) directly tandem drive small-power executive circuit (8), or by triode 5TV
1, 5TV
2with voltage-stabiliser tube 5WD
1, 5WD
2and resistance 5R
7, 5R
8the drive circuit of peripheral discrete component composition carrys out the high-power executive circuit of tandem drive (8), and described high-power executive circuit (8) is by relay 5J, diode 5D
3form.
The physical circuit connected mode of embodiment 4: described zero sequence current mutual inductor H secondary coil 5n
3one end 5V
i1contact resistance 5R
1one end, zero sequence current mutual inductor H secondary coil 5n
3other end 5V
i2contact resistance 5R
2, 5R
3tie point, resistance 5R
1the other end connects direct current power source voltage V
+ 2, resistance 5R
2other end ground connection (GND), resistance 5R
3the other end is connected to the signal input part (V of special more end countercharge integrated circuit 5FKD
i), the positive source V of special more end countercharge integrated circuit 5FKD
ccmeet direct current power source voltage V
+ 1, the earth terminal (GND) of special more end countercharge integrated circuit 5FKD connects the earth terminal (GND) of ac buck commutating DC stabilized voltage power supply (7); Resistance 5R
4, 5R
5the lower limit that series connection contact is connected to special more end countercharge integrated circuit 5FKD arranges end (V
l), resistance 5R
4other end earth terminal (GND), resistance 5R
5, 5R
6the upper limit that series connection contact is connected to special more end countercharge integrated circuit 5FKD arranges end (V
h), resistance 5R
6another termination direct current power source voltage V
+ 1, resistance 5R
7be connected to the inverse output terminal (V of special more end countercharge integrated circuit 5FKD
oF) on, resistance 5R
7another termination voltage stabilizing didoe 5WD
2negative pole, voltage stabilizing didoe 5WD
2positive pole meet triode 5TV
2base stage, triode 5TV
2grounded emitter end (GND), triode 5TV
2collector electrode be connected on diode 5D
3positive pole, relay 5J coil two ends are attempted by diode 5D
3positive pole and negative pole, diode 5D
3negative pole connecting triode 5TV
1collector electrode, the forward output (V of special more end countercharge integrated circuit 5FKD
oZ) connecting resistance 5R
8, resistance 5R
8another termination voltage stabilizing didoe 5WD
1positive pole, voltage stabilizing didoe 5WD
1negative pole meet triode 5TV
1base stage, triode 5TV
1emitter be connected on direct current power source voltage V
+ 3or V
+ 1on, reset countercharge end (BER) contact resistance 5R of special more end countercharge integrated circuit 5FKD
9, 5R
10series connection contact, resistance 5R
10other end earth terminal (GND), resistance 5R
9another termination direct current power source voltage V
+ 1, two ac input ends of ac buck commutating DC stabilized voltage power supply (7) are connected to the AC load side two alternating current wires L of relay normally open contact 5J
1, N
1on, the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3higher than V
+ 2, direct current power source voltage V
+ 2higher than V
+ 1, the secondary coil 5n of described zero sequence current mutual inductor H
3around the coil on its ring-shaped core, its primary coil n
1, n
2be and penetrate two AC power cord L in ring-shaped core hole
1, N
1, two couples of normally opened contact 5J of relay 5J control the logical and disconnected of the AC power of controlled AC load, and QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load.
The circuit working principle of embodiment 4:
After manually pressing start button QD, the normally opened contact 5J of relay maintains attracting state, continues to connect AC power, and control circuit of earth leakage system and controlled AC load (electrical appliance) thereof obtain electric work.If controlled AC load (electrical appliance) normally works, without electric leakage/getting an electric shock occurs, by AC power cord L
1, N
1on equal, the direction of size of current contrary, offsetting at the magnetic flux of zero sequence current mutual inductor H ring-shaped core internal induction is zero, therefore at zero sequence current mutual inductor H secondary coil 5n
3two ends produce without alternating current/voltage, only have secondary 5n
3the D.C. resistance of coil is serially connected in resistance 5R
1, 5R
2the DC partial voltage of upper formation drops on 5V
i1, 5V
i2two inputs, through resistance 5R
3pass to special more end countercharge integrated circuit 5FKD signal input part V
icurrent potential just in time higher than the lowest limit lower than lower limit arrange end V
lbottom boundary potential, make the forward output (V of special more end countercharge integrated circuit 5FKD
oZ) export electronegative potential driving triode 5TV
1conducting, inverse output terminal (V
oF) export high potential driving triode 5TV
2conducting, the adhesive of relay 5J coil electricity, its two couples of normally opened contact 5J connect the AC power of controlled AC load (electrical appliance), and maintain normal power supply state.Now, reset countercharge end (BER) of special more end countercharge integrated circuit 5FKD exports high potential, also can be energized with its direct or indirect control relay.
If controlled AC load (electrical appliance) is leaked electricity/got an electric shock, make AC power cord L
1, N
1the uneven alternating current of upper generation, produces induction magnetic flux in zero sequence current mutual inductor H annular core, therefore at zero sequence current mutual inductor H secondary coil 5n
3two ends just produce induced current/voltage signal.If signal voltage is higher than setting, to special more end countercharge time-base integrated circuit 5FKD signal input part V
icurrent potential surmount the upper limit arrange end V
hupper boundary potential, trigger special more end countercharge time-base integrated circuit 5FKD immediately and make its inverse output terminal (V
oF) output low level pressure triode 5TV
2cut-off, forward output (V
oZ) export high level pressure triode 5TV
1end, force relay 5J coil blackout to discharge, its two couples of normally opened contact 5J cut off the AC power of controlled AC load (electrical appliance), and maintain abnormal obliteration off-position, make electric leakage/electric shock obtain safeguard protection.Now, reset countercharge end (BER) of special more end countercharge integrated circuit 5FKD still exports high potential, also can be energized with its direct or indirect control relay.
As zero sequence current mutual inductor H secondary coil 5n
3when there is disconnection fault, make input 5V
i2, V
ipotential pole is low, holds lowest limit current potential lower than losing in special more end countercharge time-base integrated circuit 5FKD, triggers special more end countercharge time-base integrated circuit 5FKD immediately and makes its inverse output terminal (V
c2) output low level pressure triode 5TV
2cut-off, forward output (V
c1) export high level pressure triode 5TV
1end, force relay 5J coil blackout to discharge, its two couples of normally opened contact 5J cut off the AC power of controlled AC load (electrical appliance), and maintain locking off-position, avoid the false running status of protecting that lost efficacy occurs.Now, reset countercharge end (BER) of special more end countercharge integrated circuit 5FKD exports electronegative potential, also can with its direct or indirect control relay power-off.
Visible, embodiment 4 not only can carry out the safety protection control of locking power-off to the electric leakage/electric shock of AC load (electrical appliance) when normal work, and at zero sequence current mutual inductor H secondary coil 5n
3there is disconnection fault or when himself there is some abnormal failure; also cut-off protecting control can be locked in time; the AC power of forced release AC load (electrical appliance); but its reliability, fail safe may be high not as good as embodiment 1,2, only a few extraordinary failure may be there is and refuse to jump phenomenon.Thus, embodiment 4 also belongs to a kind of safer earth leakage protective device.
Embodiment 1 ~ 4 is the preferred embodiments of the present invention, and the operation principle of energy full-time instruction technical scheme of the present invention and Fig. 1 circuit block diagram, not limits the scope of the invention.Certainly; according to structure and the principle of method of the present invention and circuit block diagram (see Fig. 1); can design or modify out the embodiment of a variety of function equivalent change; but be all included in the protection range of method of the present invention and circuit block diagram (see Fig. 1), the protection range required by claims is perfectly clear clearly.
Claims (5)
1. the safe earth leakage protective device of a fail-safe inefficacy, comprise zero sequence current mutual inductor H, ac buck commutating DC stabilized voltage power supply (7), executive circuit (8), it is characterized in that: also comprise normally and to maintain and signal deteching circuit (1), up and down base limit arranges circuit (2), the upper exclusive circuit (3) of low normal open/height, mistake hold that the lowest limit arranges circuit (4), maintenance normal open/mistake is held and locked circuit (5), logic control circuit and drive circuit (6); Described normally maintenance and the signal input part V of signal deteching circuit (1)
i1and V
i2connect the secondary coil n of zero sequence current mutual inductor H
3two ends, the signal output part of normally maintenance and signal deteching circuit (1) connects the signal input part (V of exclusive circuit (3) on low normal open/height
i) and maintain normal open/mistake hold the signal input part (V locking circuit (5)
i), normally maintains and the positive source of signal deteching circuit (1) connects ac buck commutating DC stabilized voltage power supply (7) the direct current power source voltage V that exports
+ 2or V
+ 1; The described limit of base up and down arranges the feedback input end connection logic control circuit of circuit (2) and the feedback output end (V of drive circuit (6)
f), upper and lower base limit arranges the base limit output (V of circuit (2)
h/ V
l) connect the base limit input (V of exclusive circuit (3) on low normal open/height
z/ V
m), upper and lower base limit arranges the power input (V of circuit (2)
r) connect maintain normal open/mistake hold the output (V locking circuit (5)
c/ V
e/ BER), upper and lower base limit arranges the power input (V of circuit (2)
r) or connect ac buck commutating DC stabilized voltage power supply (7) the direct current power source voltage V that exports
+ 1; Output (the V of exclusive circuit (3) on described low normal open/height
o/ V
q) connect an input of logic control circuit and drive circuit (6); Described mistake is held the lowest limit and is arranged circuit (4) lowest limit input (V
d) connect normally and maintain and the abnormality detection end (V of signal deteching circuit (1)
t), or described mistake is held the lowest limit and is arranged circuit (4) lowest limit input (V
d) the external output (V connecting exclusive circuit (3) on low normal open/height
o/ V
q), or described mistake is held the lowest limit and is arranged circuit (4) lowest limit input (V
d) connect maintain normal open/mistake hold the output (V locking circuit (5)
c/ V
e/ BER), lose hold lowest limit output that the lowest limit arranges circuit (4) connect maintain normal open/mistake hold lock circuit (5) lock control end (V
s); Output (the V locking circuit (5) is held in described maintenance normal open/mistake
c/ V
e/ BER) also connect another input of logic control circuit and drive circuit (6); Described logic control circuit and drive circuit (6) output (V
j) connecting the input of executive circuit (8), logic control circuit and drive circuit (6) positive source connect the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3; The direct current power source voltage V that described ac buck commutating DC stabilized voltage power supply (7) exports
+ 1connect exclusive circuit (3) and mistake on low normal open/height hold the lowest limit arrange circuit (4) and maintain normal open/mistake hold the power positive end locking circuit (5), the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3> V
+ 2> V
+ 1, two ac power input ends of ac buck commutating DC stabilized voltage power supply (7) are connected to the AC load side two alternating current wires L of alternating-current switch or relay normally open contact J
1, N
1on; The output of described executive circuit (8) or relay normally open contact J control the logical and disconnected of the AC power of controlled AC load; QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load; The secondary coil n of described zero sequence current mutual inductor H
3only belong to sequence mode through the indirect sequential control executive circuit (8) of intermediate circuit link, or the secondary coil n of zero sequence current mutual inductor H
3not only through the indirect sequential control of intermediate circuit link but also directly series connection controls executive circuit (8) and belongs to multiple prosecutor formula.
2. the safe earth leakage protective device of a kind of fail-safe inefficacy according to claim 1, is characterized in that: this protector also comprises special complete stable control integrated circuit 2WKD; Two are had to input separate unit circuit in parallel, to export separately complementation, the forward output (V of its first separate unit circuit in described special complete stable control integrated circuit 2WKD
o1) and the inverse output terminal (V of the second separate unit circuit
o2) direct tandem drive small-power executive circuit (8), or by triode 2TV
1, 2TV
2with voltage-stabiliser tube 2WD
1, 2WD
2and resistance 2R
7, 2R
8the drive circuit of peripheral discrete component composition drives high-power executive circuit (8), and described small-power executive circuit (8) is by relay 2J
1, diode 2D
1, 2D
2form, described high-power executive circuit (8) is by relay 2J, diode 2D
3form; In described special complete stable control integrated circuit 2WKD, each separate unit circuit is maintained by described normally and signal deteching circuit (1), up and down base are limit and arranged circuit (2), the upper exclusive circuit (3) of low normal open/height, lose and hold that the lowest limit arranges circuit (4), maintenance normal open/mistake is held and locked circuit (5), logic control circuit and drive circuit (6), outer distribution resistance 2R
mcomposition, or the circuit replacement anti-out of control that each separate unit circuit coordinates a small amount of peripheral discrete component to form by general simulation integrated operational amplifier or voltage comparator or digital circuit or Single Chip Microcomputer (SCM) program control circuit; Described zero sequence current mutual inductor H secondary coil 2n
3one end 2V
i1be connected to the signal input part (V of special complete stable control integrated circuit 2WKD
i), zero sequence current mutual inductor H secondary coil 2n
3other end 2V
i2the lowest limit being connected to special complete stable control integrated circuit 2WKD arranges end (V
d/ V
t); Positive source (the V of described special complete stable control integrated circuit 2WKD
cc) meet direct current power source voltage V
+ 1, the earth terminal (GND) of special complete stable control integrated circuit 2WKD connects the earth terminal (GND) of ac buck commutating DC stabilized voltage power supply (7); Forward output (the V of special complete stable control integrated circuit 2WKD
o1) internally connect and maintain normal open/mistake and hold the output (V locking circuit (5)
c/ V
e/ BER), the inverse output terminal (V of special complete stable control integrated circuit 2WKD
o2) the internal output (V connecting exclusive circuit (3) on low normal open/height
o/ V
q), the base limit of special complete stable control integrated circuit 2WKD arranges end (V
z/ V
m) to earth terminal (GND) guest performer resistance 2R
m, in order to regulate or to change the trigger sensitivity of exclusive circuit (3) on the inner low normal open/height of special complete stable control integrated circuit 2WKD; Inverse output terminal (the V of special complete stable control integrated circuit 2WKD
o2) to voltage stabilizing didoe 2WD
2negative pole series resistor 2R
7, voltage stabilizing didoe 2WD
2positive pole meet triode 2TV
2base stage, triode 2TV
2emitter be connected with earth terminal (GND), triode 2TV
2collector electrode be connected on diode 2D
3positive pole, relay 2J coil two ends are attempted by diode 2D
3positive pole and negative pole, diode 2D
3negative pole connecting triode 2TV
1collector electrode; Forward output (the V of special complete stable control integrated circuit 2WKD
o1) connecting resistance 2R
8or diode 2D
1negative pole, resistance 2R
8another termination voltage stabilizing didoe 2WD
1positive pole, voltage stabilizing didoe 2WD
1negative pole meet triode 2TV
1base stage, triode 2TV
1emitter meet direct current power source voltage V
+ 3; Inverse output terminal (the V of special complete stable control integrated circuit 2WKD
o2) or connect diode 2D
2negative pole and relay 2J
1one end of coil, relay 2J
1the other end of coil connects diode 2D
1, 2D
2positive pole; Two ac input ends of ac buck commutating DC stabilized voltage power supply (7) are connected to relay normally open contact 2J or 2J
1aC load side two alternating current wires L
1, N
1on, the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3higher than V
+ 2, direct current power source voltage V
+ 2higher than V
+ 1, the secondary coil 2n of described zero sequence current mutual inductor H
3around the coil on its ring-shaped core, its primary coil n
1, n
2be and penetrate two AC power cord L in ring-shaped core hole
1, N
1, relay 2J or 2J
1two couples of normally opened contact 2J or 2J
1control the logical and disconnected of the AC power of controlled AC load, QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load.
3. the safe earth leakage protective device of a kind of fail-safe inefficacy according to claim 1, is characterized in that: this protector also comprises Special safety control integration circuit 3AKD; Described normally maintenance and signal deteching circuit (1) comprise the secondary coil 3n of zero sequence current mutual inductor H
3with resistance 3R
1, 3R
2, 3R
3, the described limit of base up and down arranges circuit (2) and comprises resistance 3R
4, 3R
5, 3R
6, input separate unit circuit in parallel, to export separately complementation, the forward output (V of the first separate unit circuit in core circuit with Special safety control integration circuit 3AKD for there being two in core circuit
c1) and the inverse output terminal (V of the second separate unit circuit
c2) direct tandem drive small-power executive circuit (8), or by triode 3TV
1, 3TV
2with voltage-stabiliser tube 3WD
1, 3WD
2and resistance 3R
7, 3R
8the drive circuit of peripheral discrete component composition carrys out the high-power executive circuit of tandem drive (8), and described small-power executive circuit (8) is by relay 3J
1, diode 3D
1, 3D
2form, described high-power executive circuit (8) is by relay 3J, diode 3D
3form, in described core circuit each separate unit circuit by exclusive circuit (3) described low normal open/height on, lose and hold that the lowest limit arranges circuit (4), maintenance normal open/mistake is held and locked circuit (5), logic control circuit and drive circuit (6), outer distribution resistance 3R
9composition, or the circuit replacement anti-out of control that each separate unit circuit coordinates a small amount of peripheral discrete component to form by general simulation integrated operational amplifier or voltage comparator or digital circuit or Single Chip Microcomputer (SCM) program control circuit; Described zero sequence current mutual inductor H secondary coil 3n
3one end 3V
i1contact resistance 3R
1one end, described zero sequence current mutual inductor H secondary coil 3n
3other end 3V
i2contact resistance 3R
2, 3R
3tie point, resistance 3R
1the other end should connect direct current power source voltage V by sequence mode
+ 2, answer connecting triode 3TV by multiple prosecutor formula
1collector electrode, resistance 3R
2other end ground connection (GND), resistance 3R
3the other end is connected to the signal input part (V of core circuit
i); Positive source (the V of described core circuit
cc) meet direct current power source voltage V
+ 1, the earth terminal (GND) of core circuit connects the earth terminal (GND) of ac buck commutating DC stabilized voltage power supply (7); Resistance 3R
4, 3R
5, 3R
6the base limit being connected to core circuit after star parallel connection arranges end (V
z/ V
m), resistance 3R
4other end ground connection (GND), resistance 3R
5another termination direct current power source voltage V
+ 1, resistance 3R
6the other end and resistance 3R
7be connected to the inverse output terminal (V of core circuit
c2) on; Resistance 3R
7another termination voltage stabilizing didoe 3WD
2negative pole, voltage stabilizing didoe 3WD
2positive pole meet triode 3TV
2base stage, triode 3TV
2grounded emitter (GND), triode 3TV
2collector electrode be connected on diode 3D
3positive pole, relay 3J coil two ends are attempted by diode 3D
3positive pole and negative pole, diode 3D
3negative pole answers connecting triode 3TV by sequence mode
1collector electrode, diode 3D
3negative pole should connect zero sequence current mutual inductor H secondary coil 3n by multiple prosecutor formula
33V
i2end; The lowest limit of described core circuit arranges end (V
d/ V
q) contact resistance 3R
9, resistance 3R
9another termination direct current power source voltage V
+ 3; Forward output (the V of described core circuit
c1) connecting resistance 3R
8or diode 3D
1negative pole, resistance 3R
8another termination voltage stabilizing didoe 3WD
1positive pole, voltage stabilizing didoe 3WD
1negative pole meet triode 3TV
1base stage, triode 3TV
1emitter be connected on direct current power source voltage V
+ 3on; Inverse output terminal (the V of described core circuit
c2) or connect diode 3D
2negative pole and relay 3J
1one end of coil, relay 3J
1the other end of coil connects diode 3D
1, 3D
2positive pole; Two ac input ends of described ac buck commutating DC stabilized voltage power supply (7) are connected to relay normally open contact 3J or 3J
1aC load side two alternating current wires L
1, N
1on, the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3higher than V
+ 2, direct current power source voltage V
+ 2higher than V
+ 1; The secondary coil 3n of zero sequence current mutual inductor H
3around the coil on its ring-shaped core, its primary coil n
1, n
2be and penetrate two AC power cord L in ring-shaped core hole
1, N
1; Relay 3J or 3J
1two couples of normally opened contact 3J or 3J
1control the logical and disconnected of the AC power of controlled AC load; QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load.
4. the safe earth leakage protective device of a kind of fail-safe inefficacy according to claim 1, is characterized in that: described normally maintenance and signal deteching circuit (1) comprise the secondary coil 4n of zero sequence current mutual inductor H
3, electric capacity 4C, resistance 4R
1, 4R
2with voltage-stabiliser tube 4WD
1, 4WD
2with triode 4TV
1, 4TV
2, the described limit of base up and down arranges circuit (2) and comprises resistance 4R
1, 4R
2, on described low normal open/height, exclusive circuit (3) comprises resistance 4R
1, 4R
2with diode 4D
4, 4D
5with voltage-stabiliser tube 4WD
1, 4WD
2, lose and hold the lowest limit and circuit (4) is set comprises abnormal detection circuit TDS, maintain normal open/mistakes and hold and lock circuit (5) and comprise and simulate integrated operational amplifier or voltage comparator 4A
1, 4A
2with diode 4D
1, 4D
2, resistance 4R
3, described logic control circuit and drive circuit (6) comprise triode 4TV
1, 4TV
2, the direct current power source voltage that described ac buck commutating DC stabilized voltage power supply (7) exports only needs V
+ 1; Described executive circuit (8) is by relay 4J, diode 4D
3form, executive circuit (8) or only driven separately by the 1st element circuit or the 2nd element circuit, the 1st described element circuit is by triode 4TV
1, voltage-stabiliser tube 4WD
1, diode 4D
1, resistance 4R
1with simulation integrated operational amplifier or voltage comparator 4A
1composition, the 2nd described element circuit is by triode 4TV
2, voltage-stabiliser tube 4WD
2, diode 4D
2, resistance 4R
2with simulation integrated operational amplifier or voltage comparator 4A
2composition; Described zero sequence current mutual inductor H secondary coil 4n
3two output 4V
i1, 4V
i2resistance 4R is serially connected in after shunt-wound capacitance 4C
1, 4R
2between, zero sequence current mutual inductor H secondary coil 4n
3output 4V
i1diode 4D is also connected as the 1st element circuit signal input part
5negative pole and simulation integrated operational amplifier or voltage comparator 4A
1inverting input and simulation integrated operational amplifier or voltage comparator 4A
2normal phase input end, zero sequence current mutual inductor H secondary coil 4n
3output 4V
i2diode 4D is also connected as the 2nd element circuit signal input part
4input (the V of positive pole and abnormal detection circuit TDS
t/ V
d); Resistance 4R
1the other end connects diode 4D
1, 4D
4negative pole and voltage-stabiliser tube 4WD
1positive pole, voltage-stabiliser tube 4WD
1negative pole connecting triode 4TV
1base stage, triode 4TV
1emitter be connected on direct current power source voltage V
+ 1on; Resistance 4R
2the other end connects diode 4D
2, 4D
5positive pole and voltage-stabiliser tube 4WD
2negative pole, voltage-stabiliser tube 4WD
2positive pole connecting triode 4TV
2base stage, triode 4TV
2grounded emitter end (GND); Triode 4TV
2collector electrode be connected on diode 4D
3positive pole, relay 4J coil two ends are attempted by diode 4D
3positive pole and negative pole, diode 4D
3negative pole connecting triode 4TV
1collector electrode; Simulation integrated operational amplifier or voltage comparator 4A
1normal phase input end and simulation integrated operational amplifier or voltage comparator 4A
2inverting input be attempted by the output (V of abnormal detection circuit TDS
s) on; Simulation integrated operational amplifier or voltage comparator 4A
1, 4A
2power positive end be connected to direct current power source voltage V
+ 1on, simulation integrated operational amplifier or voltage comparator 4A
1, 4A
2power cathode ground connection (GND); Simulation integrated operational amplifier or voltage comparator 4A
1output connect diode 4D
1positive pole and resistance 4R
3, resistance 4R
3the other end is connected to direct current power source voltage V
+ 1on; Simulation integrated operational amplifier or voltage comparator 4A
2output connect diode 4D
2negative pole; Two ac input ends of ac buck commutating DC stabilized voltage power supply (7) are connected to the AC load side two alternating current wires L of relay normally open contact 4J
1, N
1on, the direct current power source voltage that ac buck commutating DC stabilized voltage power supply (7) exports only needs V
+ 1; The secondary coil 4n of described zero sequence current mutual inductor H
3around the coil on its ring-shaped core, its primary coil n
1, n
2be and penetrate two AC power cord L in ring-shaped core hole
1, N
1, two couples of normally opened contact 4J of relay 4J control the logical and disconnected of the AC power of controlled AC load; QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load.
5. the safe earth leakage protective device of a kind of fail-safe inefficacy according to claim 1, is characterized in that: this protector also comprises special more end countercharge integrated circuit 5FKD; Described normally maintains and signal deteching circuit (1) comprises zero sequence current mutual inductor H secondary coil 5n
3with resistance 5R
1, 5R
2, 5R
3, the described limit of base up and down arranges circuit (2) and comprises resistance 5R
4, 5R
5, 5R
6, exclusive circuit (3) on described low normal open/height, lose hold the lowest limit circuit (4) is set, maintain normal open/mistakes hold lock circuit (5), logic control circuit and drive circuit (6), outer distribution hinders 5R
9, 5R
10form special more end countercharge integrated circuit 5FKD, or coordinate a small amount of peripheral discrete component to form the special more end by general simulation integrated operational amplifier or voltage comparator or digital circuit or Single Chip Microcomputer (SCM) program control circuit to countercharge integrated circuit 5FKD, described logic control circuit and drive circuit (6) directly tandem drive small-power executive circuit (8), or by triode 5TV
1, 5TV
2with voltage-stabiliser tube 5WD
1, 5WD
2and resistance 5R
7, 5R
8the drive circuit of peripheral discrete component composition carrys out the high-power executive circuit of tandem drive (8), and described high-power executive circuit (8) is by relay 5J, diode 5D
3form, described zero sequence current mutual inductor H secondary coil 5n
3one end 5V
i1contact resistance 5R
1one end, zero sequence current mutual inductor H secondary coil 5n
3other end 5V
i2contact resistance 5R
2, 5R
3tie point, resistance 5R
1the other end connects direct current power source voltage V
+ 2, resistance 5R
2other end ground connection (GND), resistance 5R
3the other end is connected to the signal input part (V of special more end countercharge integrated circuit 5FKD
i), the positive source V of special more end countercharge integrated circuit 5FKD
ccmeet direct current power source voltage V
+ 1, the earth terminal (GND) of special more end countercharge integrated circuit 5FKD connects the earth terminal (GND) of ac buck commutating DC stabilized voltage power supply (7); Resistance 5R
4, 5R
5the lower limit that series connection contact is connected to special more end countercharge integrated circuit 5FKD arranges end (V
l), resistance 5R
4other end earth terminal (GND), resistance 5R
5, 5R
6the upper limit that series connection contact is connected to special more end countercharge integrated circuit 5FKD arranges end (V
h), resistance 5R
6another termination direct current power source voltage V
+ 1, resistance 5R
7be connected to the inverse output terminal (V of special more end countercharge integrated circuit 5FKD
oF) on, resistance 5R
7another termination voltage stabilizing didoe 5WD
2negative pole, voltage stabilizing didoe 5WD
2positive pole meet triode 5TV
2base stage, triode 5TV
2grounded emitter end (GND), triode 5TV
2collector electrode be connected on diode 5D
3positive pole, relay 5J coil two ends are attempted by diode 5D
3positive pole and negative pole, diode 5D
3negative pole connecting triode 5TV
1collector electrode, the forward output (V of special more end countercharge integrated circuit 5FKD
oZ) connecting resistance 5R
8, resistance 5R
8another termination voltage stabilizing didoe 5WD
1positive pole, voltage stabilizing didoe 5WD
1negative pole meet triode 5TV
1base stage, triode 5TV
1emitter be connected on direct current power source voltage V
+ 3or V
+ 1on, reset countercharge end (BER) contact resistance 5R of special more end countercharge integrated circuit 5FKD
9, 5R
10series connection contact, resistance 5R
10other end earth terminal (GND), resistance 5R
9another termination direct current power source voltage V
+ 1, two ac input ends of ac buck commutating DC stabilized voltage power supply (7) are connected to the AC load side two alternating current wires L of relay normally open contact 5J
1, N
1on, the direct current power source voltage V that ac buck commutating DC stabilized voltage power supply (7) exports
+ 3higher than V
+ 2, direct current power source voltage V
+ 2higher than V
+ 1, the secondary coil 5n of described zero sequence current mutual inductor H
3around the coil on its ring-shaped core, its primary coil n
1, n
2be and penetrate two AC power cord L in ring-shaped core hole
1, N
1, two couples of normally opened contact 5J of relay 5J control the logical and disconnected of the AC power of controlled AC load, and QD is artificial start button, presses the AC power of rear connection ac buck commutating DC stabilized voltage power supply (7) and controlled AC load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310235037.8A CN103337830B (en) | 2013-03-21 | 2013-05-31 | The safe earth leakage protective device that a kind of fail-safe lost efficacy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310113232.3 | 2013-03-21 | ||
| CN201310113232 | 2013-03-21 | ||
| CN201310235037.8A CN103337830B (en) | 2013-03-21 | 2013-05-31 | The safe earth leakage protective device that a kind of fail-safe lost efficacy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103337830A CN103337830A (en) | 2013-10-02 |
| CN103337830B true CN103337830B (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310235037.8A Active CN103337830B (en) | 2013-03-21 | 2013-05-31 | The safe earth leakage protective device that a kind of fail-safe lost efficacy |
| CN201410112113.0A Active CN103840429B (en) | 2013-03-21 | 2014-03-20 | Safety universal control circuit module and safety leakage protector |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410112113.0A Active CN103840429B (en) | 2013-03-21 | 2014-03-20 | Safety universal control circuit module and safety leakage protector |
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|---|---|
| CN (2) | CN103337830B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410039A (en) * | 2014-10-16 | 2015-03-11 | 刘圣平 | Safe universal control circuit |
| CN105990816B (en) * | 2015-02-05 | 2019-02-15 | 刘圣平 | A kind of safer earth leakage protective device |
| CN104950779B (en) * | 2015-06-09 | 2024-05-28 | 刘圣平 | Stable and stable control circuit chip and safety control electric appliance thereof |
| CN104993451A (en) * | 2015-08-03 | 2015-10-21 | 刘圣平 | Very effective leakage protector |
| CN104993452A (en) * | 2015-08-03 | 2015-10-21 | 刘圣平 | Safe, reliable and efficient leakage protector |
| CN106225250A (en) * | 2016-09-06 | 2016-12-14 | 广东万家乐燃气具有限公司 | A kind of control system of electric water heater of tape relay fault feedback function |
| CN106773994B (en) * | 2017-01-09 | 2023-08-04 | 浙江新涛电子科技有限公司 | Circuit for controlling PE ground wire in time sequence and control method |
| CN107749612A (en) * | 2017-11-28 | 2018-03-02 | 毛春梅 | A kind of power transformer with DC leakage protection |
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| CN2277591Y (en) * | 1996-11-29 | 1998-04-01 | 李逢天 | Electrical equipment protecting device |
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| EP0866536A2 (en) * | 1997-03-19 | 1998-09-23 | Siemens Aktiengesellschaft | Universal ground fault circuit interrupter |
| CN2472384Y (en) * | 2001-03-03 | 2002-01-16 | 林李杰 | Intellectual leakage breaker |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103840429A (en) | 2014-06-04 |
| CN103337830A (en) | 2013-10-02 |
| CN103840429B (en) | 2017-02-08 |
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