CN105990816A - Safer electric leakage protector - Google Patents
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- CN105990816A CN105990816A CN201510070151.9A CN201510070151A CN105990816A CN 105990816 A CN105990816 A CN 105990816A CN 201510070151 A CN201510070151 A CN 201510070151A CN 105990816 A CN105990816 A CN 105990816A
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Abstract
The invention relates to a safer electric leakage protector. A technical scheme is characterized in that a time-base circuit is taken as a core module; a setting and trigger circuit is arranged among a trigger terminal, a control terminal, a reset terminal and a zero sequence current transformer H; an output or discharge terminal of the core module is provided with a driving and execution circuit; a setting capacitor triggers and sets the electric leakage protector to be in a normal open state, and makes a relay connect an alternating current power supply of a load; leaked electricity induced by a zero sequence current transformer secondary coil or an electric shock signal voltage is used to trigger the time-base circuit so as to drive the relay to cut off the alternating current power supply of the load so that electric leakage protection control is realized; and the reset terminal and the trigger terminal of the time-base circuit are used to monitor an abnormal fault of the time-base circuit itself and safe protection control is performed. When the protector has a single fault, a protect function is not failed so that the protector is safer than an old-type electric leakage protector.
Description
Technical field
The present invention relates to a kind of electric shock or earth leakage protective device, particularly to one when single fault own, defencive function will not be caused to lose efficacy, the earth leakage protective device safer than old-fashioned earth leakage protective device.
Background technology
In order to examine the 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; when normal to load the electric leakage of electrical appliance or get an electric shock the most substantially can effectively protect control; but the most potential the fatal defect: if when itself occurs abnormal failure; its defencive function will lose efficacy and form out of control refusing and jump; meet electric leakage or electric shock can not cut off load or the alternating current power supply of electrical appliance in time, also cannot protect electric shock person's safety.In reality, any electronic product is again abnormal failure to occur unavoidably, such as: the secondary coil of zero sequence current mutual inductor H and tripping coil are easiest to occur broken string or short trouble, or circuit somewhere occurs open circuit or short trouble to be also common.Now, meet leakage current signal can not trigger control circuit action and being formed refuse to jump, it is impossible to cutting off load supplying in time, lose leakage protection, this is the long unheeded technical barrier in this field.Therefore, existing earth leakage protective device the most only arranges test button and checks its safety protection function the most effective, and alerts user periodic inspection effect.But, in actual use, user often ignores or forgets or be inconvenient to carry out validity check, and this just allows false peace earth leakage protective device that partial function lost efficacy at electricity online operation, and lie dormant fatal danger to the person！On the contrary, it is safely and effectively that people are also mistakenly considered it, so, existing old-fashioned earth leakage protective device is susceptible to electric shock casualty accident when extraordinary failure.
Summary of the invention
Present invention mainly solves existing old-fashioned earth leakage protective device and special core control circuit thereof, often lost efficacy out of control because of abnormal failure own, it is impossible to cut off load supplying in time, there is potential safety hazard, the technical problem of serious threat personal safety；There is provided a kind of to cause shielding failure, also can force the alternating current power supply of disconnecting consumers or electrical appliance when single fault own, still can carry out leaking electricity or electrical shock protection, the earth leakage protective device safer than old-fashioned earth leakage protective device.
Technical measures or technical scheme that the present invention takes be: with 555 time base circuits or 556 dual time base circuits as nucleus module, at its input, control end, arranging set and trigger circuit between reset terminal and zero sequence current mutual inductor H, outfan or discharge end at nucleus module arrange driving, perform circuit.
As the preferred embodiment of the invention 1,Such as figure 1Shown in, described zero sequence current mutual inductor H is by ring-shaped core, primary coil n1, n2 and secondary coil n3 composition, described set and triggering circuit are by the secondary coil n3 and resistance R1 of zero sequence current mutual inductor H, R2, electric capacity C1, C2 is constituted, described nucleus module (IC1) is exactly 555 time base circuits, described post-stage drive circuit is by resistance R3, Zener diode WD1 and audion VT1 is constituted, described rear class performs circuit and is made up of relay J 1 and diode D1, two ac input ends of described ac buck commutating DC regulated power supply (W) are connected to load or electrical appliance side two alternating current wires L of relay normally open contact J11、N1On, two AC power cord L that primary coil n1, n2 of described zero sequence current mutual inductor H are and penetrate in ring-shaped core hole1、N1, the secondary coil n3 of zero sequence current mutual inductor H is the coil being wound on its ring-shaped core, and one end of described secondary coil n3 connects the control end (V of 555 time base circuitsC: the 5th foot), control end (VC: the 5th foot) hold (GND) concatenation anti-interference electric capacity C1 over the ground, the other end of secondary coil n3 connects on the concatenation point of resistance R1, R2, and the resistance R1 other end connects the input point (V of 555 time base circuitsE), input point (VE) be exactly the high-triggering end of 555 time base circuits or claim the also tie-point (V of threshold value end (the TH: the 6 foot) and low triggering end (the TR: the 2 foot) and forced resetting end (the MR: the 4 foot)E), it is somebody's turn to do and tie-point (VE) also hold (GND) to concatenate set electric capacity C2 in circuit, the resistance R2 other end connects circuit ground end (GND), the power supply input positive pole (V of 555 described time base circuits+: the 8th foot) and negative pole (V-: the 1st foot) connect the DC voltage V that ac buck commutating DC regulated power supply (W) exports respectively+1nullWith circuit hold (GND)，In described post-stage drive circuit, resistance R3 is connected across between the outfan (the OUT: the 3 foot) of 555 time base circuits and discharge end (the DIS: the 7 foot)，The discharge end (the DIS: the 7 foot) of 555 time base circuits is also connected with Zener diode WD1 negative pole，Zener diode WD1 positive pole is connected to audion VT1 base stage，Audion VT1 emitter stage connects circuit ground end (GND)，Diode D1 positive pole in execution circuit described in the connection of audion VT1 colelctor electrode，Diode D1 negative pole connects the outfan (the OUT: the 3 foot) of 555 time base circuits，Relay J 1 coil two ends are attempted by diode D1 the two poles of the earth，Two couples of normally opened contact J1 of relay J 1 connect control load or the alternating current power supply (L of electrical appliance、N)，QD is artificial start button，Ac buck commutating DC regulated power supply (W) and the alternating current power supply (L of controlled load or electrical appliance is connected after pressing、N).
As the preferred embodiment of the invention 2,Such as figure 2Shown in, described zero sequence current mutual inductor H is made up of ring-shaped core, primary coil n1, n2 and secondary coil n3, described set and triggering circuit are made up of the secondary coil n3 and resistance R5 of zero sequence current mutual inductor H, R6, R7, electric capacity C5, C6, C7, described nucleus module (IC2) is exactly 556 dual time base circuits, and described rear class performs circuit and is made up of relay J 2 and diode D2, D3；Two ac input ends of described ac buck commutating DC regulated power supply (W) are connected to load or electrical appliance side two alternating current wires L of relay normally open contact J21、N1On, two AC power cord L that primary coil n1, n2 of described zero sequence current mutual inductor H are and penetrate in ring-shaped core hole1、N1The secondary coil n3 of zero sequence current mutual inductor H is the coil being wound on its ring-shaped core, one end of described secondary coil n3 connects first control end (the VC1: the 3 foot) and second of 556 dual time base circuits and controls end (the VC2: the 11 foot) and one end of anti-interference electric capacity C5, the other end earth terminal (GND) of anti-interference electric capacity C5, the other end of secondary coil n3 connects the concatenation point of resistance R5, R6On, the resistance R5 other end connects the first high-triggering end of 556 dual time base circuits or claims the also tie-point (V of threshold value end (the TH1: the 2 foot) and the first low triggering end (the TR1: the 6 foot)E2), it is somebody's turn to do and tie-point (VE2) also hold (GND) to concatenate set electric capacity C6 in circuit, the second high-triggering end of 556 dual time base circuits or title threshold value end (the TH2: the 12 foot) and the second low triggering end (the TR2: the 8 foot) and the first forced resetting end (the MR1: the 4 foot) and the also tie-point (V of the first discharge end (the DIS1: the 1 foot)d2) connecting the resistance R6 other end and resistance R7 and one end of electric capacity C7, resistance R7 other end connection circuit ground end (GND), the electric capacity C7 other end connects the DC voltage V that D.C. regulated power supply (W) exports+1, the power supply input positive pole (V of 556 described dual time base circuits+: the 14th foot) and negative pole (V-: the 7th foot) connect the DC voltage V that ac buck commutating DC regulated power supply (W) exports respectively+1With circuit hold (GND), second discharge end (the DIS2: the 13 foot) of 556 described dual time base circuits is unsettled need not, described rear class performs diode D2 in circuit, after D3 two positive pole connects, diode D2 negative pole connects first outfan (the OUT1: the 5 foot) of 556 dual time base circuits, diode D3 negative pole connects second outfan (the OUT2: the 9 foot) of 556 dual time base circuits, relay J 2 coil two ends are attempted by diode D2 the two poles of the earth, two couples of normally opened contact J2 of relay J 2 connect control load or the alternating current power supply (L of electrical appliance, N), QD is artificial start button, ac buck commutating DC regulated power supply (W) and the alternating current power supply (L of controlled load or electrical appliance is connected after pressing, N).
Embodiments of the invention 1 circuit operation principle is as follows:
After manually pressing start button QD, the normally opened contact J1 of relay maintains attracting state, is continuously turned on alternating current power supply, circuit for electric leakage protector system and controlled load thereof or electrical appliance obtains electric work.If controlled load or electrical appliance normally work, without electric leakage or generation of getting an electric shock, by AC power cord L1、N1On size of current equal, in opposite direction, in zero sequence current mutual inductor H ring-shaped core, the magnetic flux of sensing is offset is zero, therefore produce without alternating current or voltage at the two ends of zero sequence current mutual inductor H secondary coil n3, when circuit powers on, because electric capacity C2 voltage can not suddenly change, at input tie-point (VE) produce a negative pulse; the low triggering end making 555 time base circuits triggers effectively; outfan (the OUT: the 3 foot) and the discharge end (the DIS: the 7 foot) of 555 time base circuits are placed in high level; this high level drives audion VT1 to turn on by resistance R3 and Zener diode WD1; make execution circuit relay J1 maintain attracting state, maintain and connect circuit for electric leakage protector system and load thereof or the alternating current power supply of electrical appliance.
If controlled load or electrical appliance occur electric leakage or get an electric shock, make AC power cord L1、N1The uneven alternating current of upper generation, produces sensing magnetic flux in zero sequence current mutual inductor H annular core, therefore at the two ends of zero sequence current mutual inductor H secondary coil n3 with regard to generation faradic current or voltage signal.If this signal voltage is higher than setting value, input (VE) give 555 time base circuits high-triggering end or claim threshold value end (the TH: the 6 foot) signal voltage higher than its built-in upper boundary potential time, outfan (the OUT: the 3 foot) and the discharge end (the DIS: the 7 foot) of 555 time base circuits are locked in low level, this low level drives audion VT1 to end by resistance R3 and Zener diode WD1, relay J 1 coil blackout is forced to discharge, its two couples of normally opened contact J1 cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance, and maintain off-position all the time, non-artificial can not Power resumption, thus, electric leakage/electric shock is made to obtain normal safe protection.
When there is disconnection fault in zero sequence current mutual inductor H secondary coil n3, input (VE) current potential is less than built-in reset potential (0.4V), the forced resetting end (the MR: the 4 foot) making 555 time base circuits triggers internal trigger, outfan (the OUT: the 3 foot) and the discharge end (the DIS: the 7 foot) of 555 time base circuits are locked in low level, this low level drives audion VT1 to end by resistance R3 and Zener diode WD1, relay J 1 coil blackout is forced to discharge, 1 two couples of normally opened contact J1 of relay J cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance, and maintain locking off-position, will not occur out of control, avoid the false running status protected that lost efficacy, electric consumer is allowed to avert danger.
When zero sequence current mutual inductor H secondary coil n3 is short-circuited fault, input (VE) give the high-triggering end of 555 time base circuits or claim the signal voltage of threshold value end (the TH: the 6 foot) higher than its built-in upper boundary potential, outfan (the OUT: the 3 foot) and the discharge end (the DIS: the 7 foot) of 555 time base circuits are locked in low level, this low level drives audion VT1 to end by resistance R3 and Zener diode WD1, relay J 1 coil blackout is forced to discharge, 1 two couples of normally opened contact J1 of relay J cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance, and maintain locking off-position, will not occur out of control, avoid the false running status protected that lost efficacy, electric consumer is allowed to avert danger.
According to 555 time base circuits and embodiment 1 circuit theory and function: as the input (V of 555 time base circuitsE) by high and low current potential impulse fault time; or relay J 1 coil two ends are short-circuited or during open fault; relay J 1 coil blackout can be forced to discharge; its two couples of normally opened contact J1 cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance; and maintain abnormal obliteration off-position; will not occur out of control, it is to avoid the false running status protected that lost efficacy occurs, allows electric consumer avert danger.Therefore, embodiment 1 is higher than the security performance of old-fashioned earth leakage protective device.
But; when there is certain particularly short circuit or open fault in 555 time base circuit each port somewhere; may cause out of control; make trigger protection disabler; therefore; embodiment 1 anti-failure safety performance has limitation and individual defects, wants to eliminate this defect, and only arranged side by side with two embodiment 1 circuit, two outfans (OUT) series connection control relays.So, when a certain element circuit certain occurs certain special single failure, also only can cause the trigger protection disabler of this element circuit, and another element circuit trigger protection function is still effective, and system will not be caused out of control.This is just safer than old-fashioned earth leakage protective device.
Embodiments of the invention 2 are to be made up of side by side two element circuits, and the most each element circuit is equivalent to embodiment 1 circuit, therefore embodiment 2 is roughly the same with embodiment 1 circuit operation principle.Pardon and do not repeat.
Therefore, the preferred embodiment of the invention 2 provides the benefit that:
Not only when normal work to load or the electric leakage of electrical appliance or get an electric shock and can carry out the safety protection control of locking power-off; and when there is single failure in itself certain; triggering will not be caused to lose efficacy out of control; also can timely and reliably carry out protecting control; positive drive performs circuitry cuts load or the alternating current power supply of electrical appliance; load or electrical appliance and electric consumer are placed in safe condition, safer than old-fashioned earth leakage protective device.But when if many places occur certain special associativity fault in circuit, triggering might be caused to lose efficacy out of control, this would be the deep zone defect that cannot eliminate that time base circuit structure is intrinsic.So, the present invention is comparatively safe, the most fool proof.
Accompanying drawing explanation
Figure 1It it is the preferred embodiment of the invention 1 circuit theoryFigure；
Figure 2It it is the preferred embodiment of the invention 2 circuit theoryFigure。
Figure 1In: H is zero sequence current mutual inductor, and IC1 is 555 time base circuits, is i.e. the nucleus module (IC1) of embodiment 1, and W is ac buck commutating DC regulated power supply, and J1 is for performing circuit relay, and other is discrete electronic component.
Figure 2In: H is zero sequence current mutual inductor, and IC2 is 556 dual time base circuits, is i.e. the nucleus module (IC2) of embodiment 2, and W is ac buck commutating DC regulated power supply, and J2 is for performing circuit relay, and other is discrete electronic component.
Figure 2Described in 556 dual time base circuits, have two inside itIndependentElement circuit, eachIndependentElement circuit is exactly 555 time base circuits；nullThe function port that 1st to 6 leading foot is first module 555 time base circuit of 556 dual time base circuits，8th to 13 leading foot is the function port of second unit 555 time base circuit，So，1st foot is the first discharge end (the DIS1: the 1 foot)、2nd foot is the first high-triggering end or claims threshold value end (the TH1: the 2 foot)、3rd foot is the first control end (the VC1: the 3 foot)、4th foot is the first forced resetting end (the MR1: the 4 foot)、5th foot is the first outfan (the OUT1: the 5 foot)、6th foot is the first low triggering end (the TR1: the 6 foot)，8th foot is the second low triggering end (the TR2: the 8 foot)、9th foot is the second outfan (the OUT2: the 9 foot)、10th foot is the second forced resetting end (the MR2: the 10 foot)、11st foot is the second control end (the VC2: the 11 foot)、12nd foot is the second high-triggering end or claims threshold value end (the TH2: the 12 foot)、13rd foot is the second discharge end (the DIS2: the 13 foot)，14th foot is the power supply input positive pole (V that Unit two are public+: the 14th foot), the 7th foot be Unit two public power supply input negative pole (V-: the 7th foot).
Detailed description of the invention
Below by embodiment, and combineAccompanying drawing, technical scheme is described in further detail.
One, embodiments of the invention 1 technical scheme is illustrated:
(1)Figure 1It it is the preferred embodiment of the invention 1 circuit theoryFigure, its structural framing is as follows:
With 555 time base circuits as nucleus module (IC1), triggering input, control end at it, arrange set and trigger circuit between reset terminal and zero sequence current mutual inductor H, outfan or discharge end at nucleus module arrange driving, perform circuit；Described zero sequence current mutual inductor H is made up of ring-shaped core, primary coil n1, n2 and secondary coil n3, described set and triggering circuit are made up of the secondary coil n3 and resistance R1 of zero sequence current mutual inductor H, R2, electric capacity C1, C2, described nucleus module (IC1) is exactly 555 time base circuits, described post-stage drive circuit is made up of resistance R3, Zener diode WD1 and audion VT1, and described rear class performs circuit and is made up of relay J 1 and diode D1.
(2) embodiments of the invention 1 circuit connecting mode is as follows:
Two ac input ends of described ac buck commutating DC regulated power supply (W) are connected to load or electrical appliance side two alternating current wires L of relay normally open contact J11、N1On, two AC power cord L that primary coil n1, n2 of described zero sequence current mutual inductor H are and penetrate in ring-shaped core hole1、N1, the secondary coil n3 of zero sequence current mutual inductor H is the coil being wound on its ring-shaped core, and one end of described secondary coil n3 connects the control end (V of 555 time base circuitsC: the 5th foot), control end (VC: the 5th foot) hold (GND) concatenation anti-interference electric capacity C1 over the ground, the other end of secondary coil n3 connects on the concatenation point of resistance R1, R2, and the resistance R1 other end connects the input point (V of 555 time base circuitsE), input point (VE) be exactly the high-triggering end of 555 time base circuits or claim the also tie-point (V of threshold value end (the TH: the 6 foot) and low triggering end (the TR: the 2 foot) and forced resetting end (the MR: the 4 foot)E), it is somebody's turn to do and tie-point (VE) also hold (GND) to concatenate set electric capacity C2 in circuit, the resistance R2 other end connects circuit ground end (GND), the power supply input positive pole (V of 555 described time base circuits+: the 8th foot) and negative pole (V-: the 1st foot) connect the DC voltage V that ac buck commutating DC regulated power supply (W) exports respectively+1nullWith circuit hold (GND)，In described post-stage drive circuit, resistance R3 is connected across between the outfan (the OUT: the 3 foot) of 555 time base circuits and discharge end (the DIS: the 7 foot)，The discharge end (the DIS: the 7 foot) of 555 time base circuits is also connected with Zener diode WD1 negative pole，Zener diode WD1 positive pole is connected to audion VT1 base stage，Audion VT1 emitter stage connects circuit ground end (GND)，Diode D1 positive pole in execution circuit described in the connection of audion VT1 colelctor electrode，Diode D1 negative pole connects the outfan (the OUT: the 3 foot) of 555 time base circuits，Relay J 1 coil two ends are attempted by diode D1 the two poles of the earth，Two couples of normally opened contact J1 of relay J 1 connect control load or the alternating current power supply (L of electrical appliance、N)，QD is artificial start button，Ac buck commutating DC regulated power supply (W) and the alternating current power supply (L of controlled load or electrical appliance is connected after pressing、N).
(3) embodiments of the invention 1 circuit operation principle is as follows:
After manually pressing start button QD, the normally opened contact J1 of relay maintains attracting state, is continuously turned on alternating current power supply, circuit for electric leakage protector system and controlled load thereof or electrical appliance obtains electric work.If controlled load or electrical appliance normally work, without electric leakage or generation of getting an electric shock, by AC power cord L1、N1On size of current equal, in opposite direction, in zero sequence current mutual inductor H ring-shaped core, the magnetic flux of sensing is offset is zero, therefore produce without alternating current or voltage at the two ends of zero sequence current mutual inductor H secondary coil n3, when circuit powers on, because electric capacity C2 voltage can not suddenly change, at input tie-point (VE) produce a negative pulse; the low triggering end making 555 time base circuits triggers effectively; outfan (the OUT: the 3 foot) and the discharge end (the DIS: the 7 foot) of 555 time base circuits are placed in high level; this high level drives audion VT1 to turn on by resistance R3 and Zener diode WD1; make execution circuit relay J1 maintain attracting state, maintain and connect circuit for electric leakage protector system and load thereof or the alternating current power supply of electrical appliance.
If controlled load or electrical appliance occur electric leakage or get an electric shock, make AC power cord L1、N1The uneven alternating current of upper generation, produces sensing magnetic flux in zero sequence current mutual inductor H annular core, therefore at the two ends of zero sequence current mutual inductor H secondary coil n3 with regard to generation faradic current or voltage signal.If this signal voltage is higher than setting value, input (VE) give 555 time base circuits high-triggering end or claim threshold value end (the TH: the 6 foot) signal voltage higher than its built-in upper boundary potential time, outfan (the OUT: the 3 foot) and the discharge end (the DIS: the 7 foot) of 555 time base circuits are locked in low level, this low level drives audion VT1 to end by resistance R3 and Zener diode WD1, relay J 1 coil blackout is forced to discharge, its two couples of normally opened contact J1 cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance, and maintain off-position all the time, non-artificial can not Power resumption, thus, electric leakage/electric shock is made to obtain normal safe protection.
When there is disconnection fault in zero sequence current mutual inductor H secondary coil n3, input (VE) current potential is less than built-in reset potential (0.4V), the forced resetting end (the MR: the 4 foot) making 555 time base circuits triggers internal trigger, outfan (the OUT: the 3 foot) and the discharge end (the DIS: the 7 foot) of 555 time base circuits are locked in low level, this low level drives audion VT1 to end by resistance R3 and Zener diode WD1, relay J 1 coil blackout is forced to discharge, 1 two couples of normally opened contact J1 of relay J cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance, and maintain locking off-position, will not occur out of control, avoid the false running status protected that lost efficacy, electric consumer is allowed to avert danger.
When zero sequence current mutual inductor H secondary coil n3 is short-circuited fault, input (VE) give the high-triggering end of 555 time base circuits or claim the signal voltage of threshold value end (the TH: the 6 foot) higher than its built-in upper boundary potential, outfan (the OUT: the 3 foot) and the discharge end (the DIS: the 7 foot) of 555 time base circuits are locked in low level, this low level drives audion VT1 to end by resistance R3 and Zener diode WD1, relay J 1 coil blackout is forced to discharge, 1 two couples of normally opened contact J1 of relay J cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance, and maintain locking off-position, will not occur out of control, avoid the false running status protected that lost efficacy, electric consumer is allowed to avert danger.
According to 555 time base circuits and embodiment 1 circuit theory and function: as the input (V of 555 time base circuitsE) by high and low current potential impulse fault time; or relay J 1 coil two ends are short-circuited or during open fault; relay J 1 coil blackout can be forced to discharge; its two couples of normally opened contact J1 cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance; and maintain abnormal obliteration off-position; will not occur out of control, it is to avoid the false running status protected that lost efficacy occurs, allows electric consumer avert danger.Therefore, embodiment 1 is higher than the security performance of old-fashioned earth leakage protective device.
But; when there is certain particularly short circuit or open fault in 555 time base circuit each port somewhere; may cause out of control; make trigger protection disabler; therefore; embodiment 1 anti-failure safety performance has limitation and individual defects, wants to eliminate this defect, and only arranged side by side with two embodiment 1 circuit, two outfans (OUT) series connection control relays.So, when a certain element circuit certain occurs certain special single failure, also only can cause the trigger protection disabler of this element circuit, and another element circuit trigger protection function is still effective, and system will not be caused out of control.This is just safer than old-fashioned earth leakage protective device.
Two, embodiments of the invention 2 technical scheme is illustrated:
(1)Figure 2It it is the preferred embodiment of the invention 2 circuit theoryFigure, its structural framing is as follows:
With 556 dual time base circuits as nucleus module (IC2), triggering input, control end at it, arrange set and trigger circuit between reset terminal and zero sequence current mutual inductor H, outfan or discharge end at nucleus module arrange execution circuit；Described zero sequence current mutual inductor H is made up of ring-shaped core, primary coil n1, n2 and secondary coil n3, described set and triggering circuit are made up of the secondary coil n3 and resistance R5 of zero sequence current mutual inductor H, R6, R7, electric capacity C5, C6, C7, described nucleus module (IC2) is exactly 556 dual time base circuits, and described rear class performs circuit and is made up of relay J 2 and diode D2, D3.
(2) embodiments of the invention 2 circuit connecting mode is as follows:
Two ac input ends of described ac buck commutating DC regulated power supply (W) are connected to load or electrical appliance side two alternating current wires L of relay normally open contact J21、N1On, two AC power cord L that primary coil n1, n2 of described zero sequence current mutual inductor H are and penetrate in ring-shaped core hole1、N1The secondary coil n3 of zero sequence current mutual inductor H is the coil being wound on its ring-shaped core, one end of described secondary coil n3 connects first control end (the VC1: the 3 foot) and second of 556 dual time base circuits and controls end (the VC2: the 11 foot) and one end of anti-interference electric capacity C5, the other end earth terminal (GND) of anti-interference electric capacity C5, the other end of secondary coil n3 connects the concatenation point (V of resistance R5, R6F2On), the resistance R5 other end connects the first high-triggering end of 556 dual time base circuits or claims the also tie-point (V of threshold value end (the TH1: the 2 foot) and the first low triggering end (the TR1: the 6 foot)E2), it is somebody's turn to do and tie-point (VE2) also hold (GND) to concatenate set electric capacity C6 in circuit, the second high-triggering end of 556 described dual time base circuits or title threshold value end (the TH2: the 12 foot) and the second low triggering end (the TR2: the 8 foot) and the first forced resetting end (the MR1: the 4 foot) and the also tie-point (V of the first discharge end (the DIS1: the 1 foot)d2) connecting the resistance R6 other end and resistance R7 and one end of electric capacity C7, resistance R7 other end connection circuit ground end (GND), the electric capacity C7 other end connects the DC voltage V that D.C. regulated power supply (W) exports+1, the power supply input positive pole (V of 556 described dual time base circuits+: the 14th foot) and negative pole (V-: the 7th foot) connect the DC voltage V that ac buck commutating DC regulated power supply (W) exports respectively+1With circuit hold (GND), second discharge end (the DIS2: the 13 foot) of 556 described dual time base circuits is unsettled need not, described rear class performs diode D2 in circuit, after D3 two positive pole connects, diode D2 negative pole connects first outfan (the OUT1: the 5 foot) of 556 dual time base circuits, diode D3 negative pole connects second outfan (the OUT2: the 9 foot) of 556 dual time base circuits, relay J 2 coil two ends are attempted by diode D2 the two poles of the earth, two couples of normally opened contact J2 of relay J 2 connect control load or the alternating current power supply (L of electrical appliance, N), QD is artificial start button, ac buck commutating DC regulated power supply (W) and the alternating current power supply (L of controlled load or electrical appliance is connected after pressing, N).
(3) embodiments of the invention 2 circuit operation principle is as follows:
After manually pressing start button QD, the normally opened contact J1 of relay maintains attracting state, is continuously turned on alternating current power supply, circuit for electric leakage protector system and controlled load thereof or electrical appliance obtains electric work.If controlled load or electrical appliance normally work, without electric leakage or generation of getting an electric shock, by AC power cord L1、N1On size of current equal, in opposite direction, in zero sequence current mutual inductor H ring-shaped core, the magnetic flux of sensing is offset is zero, therefore produce without alternating current or voltage at the two ends of zero sequence current mutual inductor H secondary coil n3, when circuit powers on, because electric capacity C6, C7 voltage can not suddenly change, at input tie-point (VE2) produce a negative pulse, make first low triggering end (the TR1: the 6 foot) of 556 dual time base circuits trigger effectively, by the first outfan (OUT1 of 556 dual time base circuits；5th foot) and discharge end (the DIS1: the 1 foot) be placed in high level；Simultaneously at input tie-point (Vd2) produce a positive pulse; make the second high-triggering end of 556 dual time base circuits or claim threshold value end (the TH2: the 12 foot) to trigger effectively; second outfan (the OUT2: the 9 foot) and the discharge end (the DIS2: the 13 foot) of 556 dual time base circuits are placed in low level; make execution circuit relay J1 maintain attracting state, maintain and connect circuit for electric leakage protector system and load thereof or the alternating current power supply of electrical appliance.
If controlled load or electrical appliance occur electric leakage or get an electric shock, make AC power cord L1、N1The uneven alternating current of upper generation, produces sensing magnetic flux in zero sequence current mutual inductor H annular core, therefore at the two ends of zero sequence current mutual inductor H secondary coil n3 with regard to generation faradic current or voltage signal.If this signal voltage is higher than setting value, input (VE2) give 556 dual time base circuits the first high-triggering end or claim threshold value end (the TH: the 2 foot) signal voltage higher than its built-in upper boundary potential time, first module triggers effectively, first outfan (the OUT1: the 5 foot) and the discharge end (the DIS1: the 1 foot) of 556 dual time base circuits are locked in low level, simultaneously at input tie-point (Vd2) give the second low triggering end (the TR2: the 8 foot) signal voltage less than its built-in bottom boundary potential time; second unit triggers effectively; second outfan (the OUT2: the 9 foot) and the discharge end (the DIS2: the 13 foot) of 556 dual time base circuits are placed in high level; relay J 1 coil blackout is forced to discharge; its two couples of normally opened contact J2 cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance; and maintain off-position all the time; non-artificial can not Power resumption; thus, make electric leakage/electric shock obtain normal safe protection.
When there is disconnection fault in zero sequence current mutual inductor H secondary coil n3, input (Vd2) current potential is less than built-in reset potential (0.4V), the the first forced resetting end (the MR1: the 4 foot) making 556 dual time base circuits triggers internal trigger, first outfan (the OUT1: the 5 foot) and the discharge end (the DIS1: the 1 foot) of 556 dual time base circuits are locked in low level, simultaneously at input tie-point (Vd2) give the second low triggering end (the TR2: the 8 foot) signal voltage less than its built-in bottom boundary potential time; second unit triggers effectively; second outfan (the OUT2: the 9 foot) and the discharge end (the DIS2: the 13 foot) of 556 dual time base circuits are placed in high level; relay J 2 coil blackout is forced to discharge; 2 two couples of normally opened contact J2 of relay J cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance; and maintain locking off-position; will not occur out of control; avoid the false running status protected that lost efficacy, allow electric consumer avert danger.
When zero sequence current mutual inductor H secondary coil n3 is short-circuited fault, input (VE2null) give the first high-triggering end of 556 dual time base circuits or claim the signal voltage of threshold value end (the TH: the 2 foot) higher than its built-in upper boundary potential，First module triggers effectively，First outfan (the OUT1: the 5 foot) and first discharge end (the DIS1: the 1 foot) of 556 dual time base circuits are locked in low level，Again because the first discharge end (the DIS1: the 1 foot) is locked in low level，Make the voltage of the second low triggering end (the TR2: the 8 foot) less than its built-in bottom boundary potential，Second unit triggers effectively，Second outfan (the OUT2: the 9 foot) and second discharge end (the DIS2: the 13 foot) of 556 dual time base circuits are placed in high level，Relay J 2 coil blackout is forced to discharge，2 two couples of normally opened contact J2 of relay J cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance，And maintain locking off-position，Will not occur out of control，Avoid the false running status protected that lost efficacy，Electric consumer is allowed to avert danger.
When relay J 2 coil two ends are short-circuited or during open fault; relay J 2 coil blackout can be forced to discharge; its two couples of normally opened contact J2 cut off circuit for electric leakage protector system and controlled load or the alternating current power supply of electrical appliance; and maintain abnormal obliteration off-position; will not occur out of control; avoid the false running status protected that lost efficacy, allow electric consumer avert danger.
According to 556 dual time base circuits and embodiment 2 circuit theory and function: when 556 dual time base circuit each port somewhere occurs certain particularly short circuit or open fault; also only a certain element circuit trigger protection disabler can be caused; another element circuit trigger protection function is still effective, and system will not be caused out of control.But, if 556 dual time base circuit each port many places occur multiple combination formula short circuit or open fault especially, system may be caused out of control, make trigger protection disabler.Therefore, embodiment 2 circuit is also safer than embodiment 1 circuit, the most very comprehensive security.This is the deep zone defect that cannot eliminate that time base circuit structure is intrinsic.
Claims (2)
1. a safer earth leakage protective device, including zero sequence current mutual inductor H and ac buck commutating DC regulated power supply
(W), it is characterised in that: also include with 555 time base circuits as nucleus module (IC1), its trigger input, control end,
Arrange between forced resetting end and zero sequence current mutual inductor H set and trigger circuit, nucleus module (IC1) outfan or
Discharge end arranges driving, performs circuit；Described zero sequence current mutual inductor H is by ring-shaped core, primary coil n1, n2 and secondary
Level coil n3 composition, described set and trigger circuit by the secondary coil n3 and resistance R1 of zero sequence current mutual inductor H, R2,
Electric capacity C1, C2 are constituted, and described nucleus module (IC1) is exactly 555 time base circuits, and described post-stage drive circuit is by resistance
R3, Zener diode WD1 and audion VT1 are constituted, and described rear class performs circuit by relay J 1 and diode D1
Constitute；Two ac input ends of described ac buck commutating DC regulated power supply (W) are connected to relay normally open contact J1
Load or electrical appliance side two alternating current wires L1、N1On, primary coil n1, n2 of described zero sequence current mutual inductor H are
And penetrate two AC power cord L in ring-shaped core hole1、N1, the secondary coil n3 of zero sequence current mutual inductor H is to be wound on it
Coil on ring-shaped core, one end of described secondary coil n3 connects the control end (V of 555 time base circuitsC: the 5th foot),
Control end (VC: the 5th foot) hold the other end of (GND) concatenation anti-interference electric capacity C1, secondary coil n3 to connect resistance over the ground
On the concatenation point of R1, R2, the resistance R1 other end connects the input point (V of 555 time base circuitsE), input point (VE) be exactly
The high-triggering end of 555 time base circuits or claim threshold value end (the TH: the 6 foot) and low triggering end (the TR: the 2 foot) and forced resetting
Also tie-point (the V of end (the MR: the 4 foot)E), it is somebody's turn to do and tie-point (VE) also hold (GND) to concatenate set in circuit
Electric capacity C2, the resistance R2 other end connects circuit ground end (GND), the power supply input positive pole (V of 555 described time base circuits+:
8th foot) and negative pole (V-: the 1st foot) connect the DC voltage that ac buck commutating DC regulated power supply (W) exports respectively
V+1With circuit hold (GND), in described post-stage drive circuit resistance R3 be connected across 555 time base circuits outfan (OUT:
3rd foot) and discharge end (the DIS: the 7 foot) between, the discharge end (the DIS: the 7 foot) of 555 time base circuits is also connected with surely
Pressure diode WD1 negative pole, Zener diode WD1 positive pole is connected to audion VT1 base stage, and audion VT1 emitter stage is even
Connection circuit ground end (GND), diode D1 positive pole in the execution circuit described in the connection of audion VT1 colelctor electrode, diode
D1 negative pole connects the outfan (the OUT: the 3 foot) of 555 time base circuits, and relay J 1 coil two ends are attempted by diode D1
The two poles of the earth, two couples of normally opened contact J1 of relay J 1 connect control load or the alternating current power supply (L, N) of electrical appliance, and QD is people
Work start button, connects ac buck commutating DC regulated power supply (W) and controlled load or the alternating current power supply of electrical appliance after pressing
(L、N)。
2. a safer earth leakage protective device, including zero sequence current mutual inductor H and ac buck commutating DC regulated power supply
(W), it is characterised in that: also include with 556 dual time base circuits as nucleus module (IC2), trigger input, control at it
Holding, arrange set and trigger circuit between reset terminal and zero sequence current mutual inductor H, outfan or discharge end at nucleus module set
Put execution circuit；Described zero sequence current mutual inductor H is made up of ring-shaped core, primary coil n1, n2 and secondary coil n3,
Described set and trigger circuit by the secondary coil n3 and resistance R5 of zero sequence current mutual inductor H, R6, R7, electric capacity C5,
C6, C7 are constituted, and described nucleus module (IC2) is exactly 556 dual time base circuits, and described rear class performs electricity routing relay
J2 and diode D2, D3 are constituted；Two ac input ends of described ac buck commutating DC regulated power supply (W) connect
Load or electrical appliance side two alternating current wires L at relay normally open contact J21、N1On, described zero sequence current mutual inductor H
Primary coil n1, n2 two AC power cord L being and penetrate in ring-shaped core hole1、N1, zero sequence current mutual inductor H's
Secondary coil n3 is the coil being wound on its ring-shaped core, and one end of described secondary coil n3 connects 556 dual time base circuits
First controls end (the VC1: the 3 foot) and second controls end (the VC2: the 11 foot) and one end of anti-interference electric capacity C5, anti-interference
The other end earth terminal (GND) of electric capacity C5, the other end of secondary coil n3 connects the concatenation point (V of resistance R5, R6F2)
On, the resistance R5 other end connects the first high-triggering end of 556 dual time base circuits or claims threshold value end (TH1；2nd foot) and the
Also tie-point (the V of one low triggering end (the TR1: the 6 foot)E2), it is somebody's turn to do and tie-point (VE2) also circuit is held (GND)
Concatenation set electric capacity C6, the second high-triggering end of 556 described dual time base circuits or claim threshold value end (the TH2: the 12 foot) and
Second low triggering end (the TR2: the 8 foot) and the first forced resetting end (the MR1: the 4 foot) and the first discharge end (DIS1:
1st foot) and tie-point (Vd2) connect the resistance R6 other end and resistance R7 and one end of electric capacity C7, resistance R7 another
Termination circuit ground end (GND), the electric capacity C7 other end connects the DC voltage V that D.C. regulated power supply (W) exports+1, described
556 dual time base circuits power supply input positive pole (V+: the 14th foot) and negative pole (V-: the 7th foot) connect ac buck respectively
The DC voltage V that commutating DC regulated power supply (W) exports+1With circuit hold (GND), 556 described dual time base circuits
The second discharge end (the DIS2: the 13 foot) unsettled need not, described rear class perform in circuit diode D2, D3 two positive pole even
After connecing, diode D2 negative pole connects first outfan (the OUT1: the 5 foot) of 556 dual time base circuits, and diode D3 bears
Pole connects second outfan (the OUT2: the 9 foot) of 556 dual time base circuits, and relay J 2 coil two ends are attempted by diode
D2 the two poles of the earth, two couples of normally opened contact J2 of relay J 2 connect control load or the alternating current power supply (L, N) of electrical appliance, QD
For artificial start button, after pressing, connect exchanging of ac buck commutating DC regulated power supply (W) and controlled load or electrical appliance
Power supply (L, N).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510070151.9A CN105990816B (en) | 2015-02-05 | 2015-02-05 | A kind of safer earth leakage protective device |
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| CN201510070151.9A CN105990816B (en) | 2015-02-05 | 2015-02-05 | A kind of safer earth leakage protective device |
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| CN105990816A true CN105990816A (en) | 2016-10-05 |
| CN105990816B CN105990816B (en) | 2019-02-15 |
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|---|---|
| CN105990816B (en) | 2019-02-15 |
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