CN202333746U

CN202333746U - Electric leakage protection device

Info

Publication number: CN202333746U
Application number: CN2011205135242U
Authority: CN
Inventors: 刘睿刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-12
Filing date: 2011-12-12
Publication date: 2012-07-11
Anticipated expiration: 2021-12-12

Abstract

The utility model discloses an electric leakage protection device which not only can prevent electric shock accident caused by the failure of an electric appliance, but also can prevent the electric shock accident caused by unexpected electrification of a ground wire. The electric leakage protection device is also provided with a low current detection sensor, a voltage comparator circuit and a one-way output circuit; a primary winding and a secondary winding are wound on an iron core of the low current detection sensor; a detection loop formed by connecting the primary winding and a current-limiting capacitance resistance element in series is connected between a ground wire and a zero line; reference voltage obtained from a stabilized-voltage power supply is input into an input end of the voltage comparator circuit; one output end and another output end of the secondary winding of the low current detection sensor are connected with another input end of the voltage comparator circuit and a cathode of an output end of a rectifying circuit; and an output end of the voltage comparator circuit is connected with a drive circuit of an electromagnetic coil through a one-way output circuit.

Description

A kind of earth leakage protective device

Technical field

The utility model relates to Electrical Safety resist technology field, especially relates to a kind of earth leakage protective device.

Background technology

Chinese patent document CN1142618C discloses the leakage protecting plug that a kind of ground wire can open and close; Not only be provided with zero sequence current mutual inductor that phase line and zero line all pass on this leakage protecting plug, also be provided with the ground wire electrified detection inductor that ground wire passes; Therefore it not only can detect between load end phase line and the zero line and have or not residual current; (for example: 10mA), it will be threaded off immediately, cuts off phase line, zero line and ground wire when occurring residual current between phase, the zero line and reaching the threshold values that presets; And when the ground protection system exception causes the ground wire accident charged; It can also detect the load end ground wire has the zero accident electric current; (for example: 10mA), it also can be threaded off immediately, cuts off phase line, zero line and ground wire when ground wire unexpected electric current occurs and reaches the threshold values that presets.

By on can know; Existing earth leakage protective device is exactly must have between load end phase, the zero line must have a mind to extrinsic current on residual current or the load end ground wire and flow through and could thread off in the unexpected precondition that can thread off when charged of the electric leakage of load end fault or ground wire; So just there is following defective in existing earth leakage protective device: during use; No matter be when ground protection system ground wire disappearance (for example: the virtual connection of socket ground wire causes no ground connection) and the electric leakage of earth leakage protective device load end consuming device insulation fault; Still when ground protection system exception (for example: phase line, earth short) causes the ground wire accident charged; Dangerous voltage on the exposed metal parts band of consuming device is caused in the capital; But they all do not constitute the loop thereby also do not produce the unexpected electric current of residual current or ground wire, so, although consuming device exposed metal parts have been with dangerous voltage; But existing earth leakage protective device can not threaded off in this case automatically; Have only when human body or livestock touch these with the exposed metal parts that power on, just form the loop, earth leakage protective device is threaded off and phase line, zero line, ground wire disconnection in 0.1S thereby produce residual current or the unexpected electric current of ground wire through human body or livestock; Though in time threading off, it has protected the life security of people or livestock; But existing earth leakage protective device be in this case must be earlier through human body or livestock get an electric shock produce residual current or the unexpected electric current of ground wire and flow through human body or livestock after, it could thread off phase line, zero line, ground wire disconnection, still can cause the electric shock accidents of human body or livestock so have earth leakage protective device now.

Summary of the invention

The purpose of the utility model is to provide a kind of earth leakage protective device that can overcome above-mentioned existing earth leakage protective device defective; Electric leakage or ground wire not only can take place at the phase of load end, consuming device on the zero line road and meet accident and can all break off phase line contact, zero line contact and ground wire contact in time when charged in it; And it can also will be threaded off before people or livestock touch consuming device when when the consuming device that ground connection disappearance and earth leakage protective device load end appear in the ground protection system electric leakage takes place causes on consuming device shell and the ground tape dangerous voltage or in the ground protection system, taking place to cause the ground wire accident to be with dangerous voltage unusually automatically; In time break off phase line, zero line and ground wire, for people provide higher earth leakage protective device of reliability and better Electrical Safety guarantee.

The technical solution that the utility model proposed is such:

A kind of earth leakage protective device; Include zero sequence current mutual inductor, test loop, electromagnetic trip and locker that shell, phase line, zero line, ground wire, phase line and zero line all pass; This electromagnetic trip and locker comprise solenoid and drive circuit thereof, contact; The drive circuit of said solenoid mainly is made up of rectification circuit, the 1st controllable silicon; One output of said zero sequence current mutual inductor secondary winding and another output are connected with another input with an input of the drive circuit of said solenoid respectively; Also be provided with weak current and detect inductor, voltage comparator circuit, unidirectional output circuit; Said weak current detects inductor and is provided with iron core, elementary winding and secondary winding; Said weak current detects the elementary winding of inductor and said weak current detects the inductor secondary winding all on said weak current detection inductor iron core; Between ground wire and zero line, be connected with the detection loop that is in series by said weak current detection elementary winding of inductor and current limliting Resistor-Capacitor Unit, import said voltage comparator circuit one input from the reference voltage that stabilized voltage power supply obtains, said weak current detects inductor secondary winding one output and is connected with another input of said voltage comparator circuit; Said weak current detects another output of inductor secondary winding and is connected with said rectification circuit output end negative pole, and said voltage comparator circuit output is connected with the drive circuit of solenoid through said unidirectional output circuit.

When also being provided with amplifying circuit in the drive circuit at said solenoid; One input of the drive circuit of said solenoid and another input are respectively an input and another input of said amplifying circuit, and said amplifying circuit triggers the signal of output output and sends into the 1st controllable silicon trigger electrode.

One input of the drive circuit of said solenoid and another input are respectively said the 1st silicon controlled trigger electrode and negative electrode.

When also being provided with the 3rd resistance, the 4th resistance, the 2nd diode in the drive circuit at said solenoid; Said the 3rd resistance one end is connected with said rectification circuit output end is anodal; The 3rd resistance other end is connected with the 4th resistance one end; The 4th resistance other end is connected with the 2nd diode cathode; The 2nd diode cathode is connected with said rectification circuit output end negative pole, and the 3rd resistance other end is connected with the voltage stabilizing didoe negative pole with the tie point of the 4th resistance one end, and voltage stabilizing didoe is anodal to be connected with the rectification circuit output end negative pole; One input of the drive circuit of said solenoid and another input are respectively said the 1st controllable silicon trigger electrode and said the 2nd diode cathode.

Said current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.

Said weak current detects the inductor iron core and is processed by permalloy or amorphous alloy or ultramicro-crystal alloy material.

Said weak current detects between ground wire and the zero line that detection loop that the elementary winding of inductor and current limliting Resistor-Capacitor Unit be in series is connected power end or is connected between the ground wire and zero line of load end.

When also being provided with the 1st resistance, the 2nd resistance; The loop that said the 1st resistance and the 2nd resistance are in series is connected between the end and the other end of stabilized voltage power supply; The 1st resistance one end is connected with stabilized voltage power supply one end; The 1st resistance other end is connected with the 2nd resistance one end, and the 2nd resistance other end is connected with the stabilized voltage power supply other end, and said reference voltage is obtained from the tie point of the 1st resistance other end and the 2nd resistance one end.

When said reference voltage is sent into said voltage comparator circuit one input, when this input is the inverting input of voltage comparator circuit; Said weak current detects inductor secondary winding one output and is connected with another input of said voltage comparator circuit, and this input is the in-phase input end of voltage comparator circuit.

When said reference voltage is sent into said voltage comparator circuit one input, when this input is the in-phase input end of voltage comparator circuit; Said weak current detects inductor secondary winding one output and is connected with another input of said voltage comparator circuit, and this input is the inverting input of voltage comparator circuit.

When said unidirectional output circuit was made up of the 1st diode, the output of said voltage comparator circuit was connected with said the 1st diode cathode, and said the 1st diode cathode is connected with said the 1st controllable silicon trigger electrode.

When said unidirectional output circuit is made up of the NPN triode; The output of said voltage comparator circuit is connected with said NPN transistor base; Said NPN transistor emitter is connected with said the 1st controllable silicon trigger electrode, and said NPN transistor collector is connected with stabilized voltage power supply one end.

When said unidirectional output circuit is made up of the PNP triode; The output of said voltage comparator circuit is connected with said PNP transistor base; Said PNP transistor collector is connected with said the 1st controllable silicon trigger electrode, and said PNP transistor emitter is connected with stabilized voltage power supply one end.

When said unidirectional output circuit was made up of the 2nd controllable silicon, the output of said voltage comparator circuit was connected with the 2nd controllable silicon trigger electrode, and the 2nd silicon controlled anode and negative electrode are connected in parallel with said the 1st silicon controlled anode and negative electrode respectively.

The negative pole that one end of said stabilized voltage power supply and the other end are respectively voltage stabilizing didoe is with anodal.

Output that one end of said stabilized voltage power supply and the other end are respectively three terminal regulator and ground end.

Power end that one end of said stabilized voltage power supply and the other end are respectively said amplifying circuit and ground end.

Said voltage comparator circuit is a voltage comparator exclusive disjunction amplifier.

The substantive features of the utility model be except the same with the earth leakage protective device of prior art can detect have or not residual current between load phase, the zero line and detect ground wire whether charged, when between phase, the zero line and ground wire break down respectively or simultaneously Shi Douhui move immediately all break off phase, zero, ground wire; The earth leakage protective device that also is the utility model is provided with the detection loop that is in series by weak current detection inductor and current limliting Resistor-Capacitor Unit between ground wire and zero line; And weak current detect that inductor detects, induction output with trigger that silicon controlled circuit and zero sequence current mutual inductor detect, induction output with trigger the silicon controlled circuit and independently divide and be arranged; Detect also can not cause when inductor has signal to export simultaneously with zero-sequence current and interact when weak current detects inductor like this; When causing the ground wire accident, the ground protection system exception is with dangerous voltage or when the electric leakage of ground protection system earth disappearance and consuming device causes on exposed metal parts and the ground tape dangerous voltage; It can detect, respond to the output signal automatically and earth leakage protective device is threaded off automatically; Break off phase line, zero line, ground wire, thus realized human body or livestock touch these with on just break off phase line, zero line, ground wire entirely before the exposed metal parts of dangerous voltage.

Compared with prior art, the utlity model has following beneficial effect:

(1), the earth leakage protective device of the utility model is owing to be connected with the detection loop that is composed in series by weak current detection elementary winding of inductor and current limliting Resistor-Capacitor Unit between ground wire and zero line; When in use; In case when electric leakage of the consuming device fault on earth leakage protective device load end phase, the zero line and ground protection system ground wire disappearance (for example: the virtual connection of socket ground wire causes no ground connection); Metal parts that consuming device exposes and earth leakage protective device ground wire all can be with dangerous voltage; Weak current detects inductor will detect, responds to and export signal; And compare the reference voltage of this signal and voltage comparator circuit; When signal voltage reached predetermined value, the conducting of voltage comparator circuit output signal triggering controllable silicon just can in time be broken off phase line, zero line and ground wire earth leakage protective device entirely before human body or livestock touch consuming device; It must human body when this situation than existing earth leakage protective device or livestock touch and flow through could thread off after the residual current better technical solution is provided, so it is more safer than existing earth leakage protective device.

(2), the earth leakage protective device of the utility model is owing to be connected with the detection loop that is composed in series by weak current detection elementary winding of inductor and current limliting Resistor-Capacitor Unit between ground wire and zero line; When in use; When in case the ground protection system exception causes the ground wire accident to be with dangerous voltage; Weak current detects inductor will detect, responds to and export signal; And compare the reference voltage of this signal and voltage comparator circuit; When signal voltage reached predetermined value, the conducting of voltage comparator circuit output signal triggering controllable silicon just can in time be broken off phase line, zero line and ground wire earth leakage protective device entirely before human body or livestock touch electrical equipment; It must human body when this situation than existing earth leakage protective device or livestock touch and flow through could thread off after the unexpected electric current of ground wire better technical solution is provided, so it is more safer than existing earth leakage protective device.

(3), the earth leakage protective device of the utility model is because the elementary winding of weak current detection inductor that is connected between ground wire and the zero line also can detect, responds to and export signal to the low current signal that flows through it; And this elementary winding does not have the restriction of minimum starting voltage; So it to ground wire with voltage height unrestricted; As long as flowing through electric current that weak current detects the elementary winding of inductor reaches certain value (for example: 10 microamperes) and will make weak current detect signal voltage that the inductor secondary winding the exported reference voltage greater than voltage comparator circuit; Voltage comparator circuit will be exported the earth leakage protective device dropout that the conducting of signal triggering controllable silicon makes the utility model; Therefore it not only ground wire (or consuming device exposed metal parts) with dangerous voltage highly can thread off during for 250V, and ground wire with voltage when being low to moderate predetermined 36V safe voltage (or lower, for example: 24V) also can reliably thread off; When ground wire with voltage when being lower than predetermined 36V safe voltage; It just need not threaded off to avoid misoperation, and the voltage range that it can shield is wide, so; The earth leakage protective device of the utility model not only uses well, and safety and reliability.

(4), the earth leakage protective device of the utility model also can be threaded off when the phase line of power end and zero line reversal connection automatically; Can not reset; Have only just coming into operation after the correction of the wiring state of supply socket phase line and zero line; Forcibly standard the user side supply socket wiring requirement that must meet national regulation connect, in case other contingencies take place when using.

(5), the earth leakage protective device of the utility model weak current detect the detection, induction output of inductor, relatively, output signal triggering silicon controlled circuit detects with zero sequence current mutual inductor, induction is exported signal triggering silicon controlled circuit and independently divided and be arranged; Detect also can not cause when inductor has signal to export simultaneously with zero-sequence current and interfere with each other when weak current detects inductor like this, thus safer and reliable.

The earth leakage protective device of the utility model is mainly used on the earth leakage protective of various household electrical appliance, can make a kind of leakage protecting plug or a kind of earth leakage protective socket to the earth leakage protective device of the utility model according to the technical scheme and the electrical principle sketch map of the utility model.

Description of drawings

Fig. 1 is the earth leakage protective device electrical principle sketch map of the 1st embodiment of the utility model.

Fig. 2 is the earth leakage protective device electrical principle sketch map of the 2nd embodiment of the utility model.

Fig. 3 is the earth leakage protective device electrical principle sketch map of the 3rd embodiment of the utility model.

Fig. 4 is the earth leakage protective device electrical principle sketch map of the 4th embodiment of the utility model.

Fig. 5 is the earth leakage protective device electrical principle sketch map of the 5th embodiment of the utility model.

Fig. 6 is the earth leakage protective device electrical principle sketch map of the 6th embodiment of the utility model.

Embodiment

Through following embodiment the utility model is done further to set forth in detail.

Embodiment 1

Referring to shown in Figure 1; A kind of earth leakage protective device mainly detects inductor the 18, the 1st resistance the 19, the 2nd resistance 20, electromagnetic trip and locker, voltage comparator circuit 21, unidirectional output circuit by the phase line 8 of the phase line 5 of shell, power end, zero line 6, ground wire 7, load end, zero line 9, ground wire 10, rectification circuit the 12, the 1st controllable silicon 13, amplifying circuit 14, zero sequence current mutual inductor 15, test loop 16, current limliting Resistor-Capacitor Unit 17, weak current to be formed, and electromagnetic trip and locker mainly are made up of solenoid 11 and drive circuit, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, spring, the push rod that resets.

In the present embodiment; The drive circuit of said solenoid 11 mainly is made up of rectification circuit 12, amplifying circuit the 14, the 1st controllable silicon 13 that is built-in with stabilized voltage power supply 14-1; One output of said zero sequence current mutual inductor 15 secondary winding is connected with another input with an input of amplifying circuit 14 respectively with another output, and amplifying circuit 14 triggers the signal of output output and sends into the 1st controllable silicon 13 trigger electrodes.

In the present embodiment; The detection loop that weak current detection inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 are composed in series is connected between the ground wire 7 and zero line 6 of power end; Weak current detects inductor 18 secondary winding one output and is connected with voltage comparator circuit 21 in-phase input ends (+); Weak current detects another output of inductor 18 secondary winding and is connected with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) respectively; The reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop; The power end of the 1st resistance 19 1 ends and the amplifying circuit that is built-in with stabilized voltage power supply 14-1 14 (+VS) being connected, the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, and the 2nd resistance 20 other ends are connected with voltage comparator circuit 21 ground ends, amplifying circuit 14 ground ends (GND) respectively; The 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends; Unidirectional output circuit adopts the 1st diode 22, voltage comparator circuit 21 outputs and 22 anodal connections of the 1st diode, and the 1st diode 22 negative poles are connected with the 1st controllable silicon 13 trigger electrodes.

In the present embodiment; Current limliting Resistor-Capacitor Unit 17 is a resistance; Also can adopt electric capacity or resistance and capacitance component, the iron core that weak current detects inductor 18 adopts the ultramicro-crystal alloy material to process, and also can adopt amorphous alloy or permalloy material to process; Weak current detects the detection loop that inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 be in series and is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected load end.

In the present embodiment, unidirectional output circuit is selected the 1st diode 22 for use, also can select triode or the 2nd controllable silicon for use.

In the present embodiment, utilized the built-in stabilized voltage power supply 14-1 of amplifying circuit 14 as stabilized voltage power supply.

In the present embodiment, voltage comparator circuit 21 adopts voltage comparator, also can adopt operational amplifier.

During use; Press the push rod that resets of earth leakage protective device; Phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 are all normally connected; The phase line 8 of load end, zero line 9, ground wire 10 are connected with phase line 5, zero line 6, the ground wire 7 of power end respectively; Ground wire 7 and 10 is because the effects of ground connection are clamped at about zero volt voltage, and zero line 6 and 9 also is about zero volt simultaneously, is connected the ground wire 7 of earth leakage protective device power end and electric current that the detection loop of being made up of weak current detection inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 between the zero line 6 does not just have electric current to flow through or flow through like this and do not reach the threshold values (for example: 10 microamperes) that presets; Detect signal voltage that the induction of inductor 18 secondary winding exports to voltage comparator circuit 21 in-phase input ends (+) just less than the reference voltage of voltage comparator circuit 21 inverting inputs (-) by weak current; Voltage comparator circuit 21 outputs just are maintained low-voltage, and the 1st diode 22 ends, and the 1st controllable silicon ends; Earth leakage protective device just remains on the "on" position that resets like this, thereby for the power supply of the consuming device of its lower end with ground connection is provided.

When the ground protection system unusual (for example: phase, ground short circuit cause the ground wire accident charged) takes place when causing ground wire 7 and 10 accidents to be with dangerous voltage; Being connected the ground wire 7 of power end and the detection loop of being made up of weak current detection inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 between the zero line 6 so just has a weak current to flow through; Weak current detects signal of inductor 18 secondary winding output and gives voltage comparator circuit 21 in-phase input ends (+); And when weak current reaches the threshold values (for example: 10 microamperes) that presets; Detect the induction of inductor 18 secondary winding by weak current and export to the reference voltage of the signal voltage of voltage comparator circuit 21 in-phase input ends (+) greater than voltage comparator circuit 21 inverting inputs (-); Voltage comparator circuit 21 outputs just become high voltage; Make 22 conductings of the 1st diode; Thereby trigger 13 conductings of the 1st controllable silicon and earth leakage protective device is threaded off, before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, thereby ensure people's Electrical Safety better.

When the phase line 8 of load end, on the zero line 9 consuming device fault electric leakage and in the normal situation of ground protection system following time; Can produce a residual current through ground wire 10 and 7; Zero sequence current mutual inductor 15 can detect the residual current between phase, the zero line and export a signal and give amplifying circuit 14; And when residual current reaches the threshold values (for example: 10 milliamperes) that presets; Amplifying circuit 14 triggers output output signal, owing to the 1st diode 22 oppositely ends, thereby triggers 13 conductings of the 1st controllable silicon; Earth leakage protective device is threaded off, and before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4; And when the phase line 8 of load end, on the zero line 9 consuming device fault electric leakage and when not having ground connection (for example: the ground wire virtual connection causes no ground connection on the socket) in the ground protection system; Metal parts that consuming device exposes and earth leakage protective device ground wire 10 and 7 all can be with dangerous voltage; The detection loop of being made up of weak current detection inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 that is connected between earth leakage protective device power end ground wire 7 and the zero line 6 just has a weak current to flow through; Weak current detects signal of inductor 18 secondary winding output and gives voltage comparator circuit 21 in-phase input ends (+); And when weak current reaches the threshold values (for example: 10 microamperes) that presets; Detect the induction of inductor 18 secondary winding by weak current and export to the reference voltage of the signal voltage of voltage comparator circuit 21 in-phase input ends (+) greater than voltage comparator circuit 21 inverting inputs (-); Voltage comparator circuit 21 outputs just become high voltage; 22 conductings of the 1st diode; Thereby trigger 13 conductings of the 1st controllable silicon and earth leakage protective device is threaded off, before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, thereby ensure people's Electrical Safety better.

Embodiment 2

Referring to shown in Figure 2, present embodiment is compared with embodiment 1, and the present embodiment stabilized voltage power supply adopts voltage stabilizing didoe 24 voltage stabilizings, and unidirectional output circuit adopts NPN triode 23.

In the present embodiment; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 connect, weak current is connected composition detection loop between ground wire 7 and the zero line 6 of power end; Weak current detects inductor 18 secondary winding one output and is connected with voltage comparator circuit 21 in-phase input ends (+), and weak current detects another output of inductor 18 secondary winding and is connected with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end respectively; The reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop; The 1st resistance 19 1 ends are connected with voltage stabilizing didoe 24 negative poles; The 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends; The 2nd resistance 20 other ends are connected with voltage comparator circuit 21 ground ends, voltage stabilizing didoe 24 positive poles respectively; The 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends; Voltage comparator circuit 21 outputs are connected with NPN triode 23 base stages, and NPN triode 23 collector electrodes are connected with voltage stabilizing didoe 24 negative poles, and NPN triode 23 emitters are connected with the 1st controllable silicon 13 trigger electrodes.

In the present embodiment, unidirectional output circuit is selected NPN triode 23 for use, also can select the 1st diode or the 2nd controllable silicon for use.

Because present embodiment compares with embodiment 1, being merely voltage comparator circuit 21 provides the stabilized voltage power supply of reference voltage and unidirectional output circuit different, and remaining structure is formed all identical with embodiment 1 with circuit theory, repeats no more at this.

Embodiment 3

Referring to shown in Figure 3; A kind of earth leakage protective device mainly detects inductor the 18, the 1st resistance the 19, the 2nd resistance 20, electromagnetic trip and locker, three terminal regulator 26, voltage comparator circuit 21, unidirectional output circuit by the phase line 8 of the phase line 5 of shell, power end, zero line 6, ground wire 7, load end, zero line 9, ground wire 10, rectification circuit the 12, the 1st controllable silicon 13, amplifying circuit 14, zero sequence current mutual inductor 15, test loop 16, current limliting Resistor-Capacitor Unit 17, weak current to be formed, and electromagnetic trip and locker mainly are made up of solenoid 11 and drive circuit, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, spring, the push rod that resets.

In the present embodiment, the drive circuit of said solenoid 11 mainly is made up of rectification circuit 12, amplifying circuit the 14, the 1st controllable silicon 13.One output of said zero sequence current mutual inductor 15 secondary winding and another output respectively with the drive circuit of said solenoid 11 in an input of amplifying circuit 14 be connected with another input, amplifying circuit 14 triggers the signal of outputs output and sends into the 1st controllable silicon 13 trigger electrodes.

In the present embodiment; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 connect, weak current is connected composition detection loop between ground wire 7 and the zero line 6 of power end; Weak current detects inductor 18 secondary winding one output and is connected with voltage comparator circuit 21 inverting inputs (-); Weak current detects another output of inductor 18 secondary winding and is connected with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) respectively; The reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop; The 1st resistance 19 1 ends are connected with three terminal regulator 26 outputs (Vo), and the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, and the 2nd resistance 20 other ends are connected with voltage comparator circuit 21 ground ends, three terminal regulator 26 ground ends (GND) respectively; The 1st resistance 19 other ends are connected with the in-phase input end (+) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends; Three terminal regulator 26 inputs (Vi) are connected with rectification circuit 12 output head anodes (+) through current-limiting resistance, and unidirectional output circuit adopts PNP triode 25, and voltage comparator circuit 21 outputs are connected with PNP triode 25 base stages; PNP triode 25 emitters are connected with three terminal regulator 26 outputs (Vo), and PNP triode 25 collector electrodes are connected with the 1st controllable silicon 13 trigger electrodes.

In the present embodiment; Current limliting Resistor-Capacitor Unit 17 is a resistance; Also can adopt electric capacity or resistance and capacitance component, the iron core that weak current detects inductor 18 adopts amorphous alloy material to process, and also can adopt ultramicro-crystal alloy or permalloy material to process; Weak current detects the detection loop that inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 be in series and is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected load end.

In the present embodiment, unidirectional output circuit is selected PNP triode 25 for use.

In the present embodiment, stabilized voltage power supply adopts three terminal regulator 26 voltage stabilizings, also can select the voltage stabilizing didoe voltage stabilizing for use or utilize the power end of amplifying circuit 14 and ground to hold voltage stabilizing.

During use; Press the push rod that resets of earth leakage protective device; Phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 are all normally connected; The phase line 8 of load end, zero line 9, ground wire 10 are connected with phase line 5, zero line 6, the ground wire 7 of power end respectively; Ground wire 7 and 10 is because the effects of ground connection are clamped at about zero volt voltage, and zero line 6 and 9 also is about zero volt simultaneously, is connected the ground wire 7 of earth leakage protective device power end and electric current that the detection loop of being made up of weak current detection inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 between the zero line 6 does not just have electric current to flow through or flow through like this and do not reach the threshold values (for example: 10 microamperes) that presets; Detect the induction of inductor 18 secondary winding by weak current and export to the reference voltage of the signal voltage of voltage comparator circuit 21 inverting inputs (-) less than voltage comparator circuit 21 in-phase input ends (+); Voltage comparator circuit 21 outputs just are maintained high voltage, and PNP triode 25 ends, and the 1st controllable silicon ends; Earth leakage protective device just remains on the "on" position that resets like this, thereby for the power supply of the consuming device of its lower end with ground connection is provided.

Cause ground wire 7 and 10 accidents to be with dangerous voltage when unusual (for example: phase, ground short circuit cause the ground wire accident charged) takes place in the ground protection system; Being connected the ground wire 7 of power end and the detection loop of being made up of weak current detection inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 between the zero line 6 so just has a weak current to flow through; Weak current detects signal of inductor 18 secondary winding output and gives voltage comparator circuit 21 inverting inputs (-); And when weak current reaches predefined threshold values (for example: 10 microamperes); Detect the induction of inductor 18 secondary winding by weak current and export to the reference voltage of the signal voltage of voltage comparator circuit 21 inverting inputs (-) greater than voltage comparator circuit 21 in-phase input ends (+); Voltage comparator circuit 21 outputs just become low-voltage; 25 conductings of PNP triode; Thereby trigger 13 conductings of the 1st controllable silicon earth leakage protective device is threaded off, before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, thereby ensure people's Electrical Safety better.

When the phase line 8 of load end, on the zero line 9 consuming device fault electric leakage and in the normal situation of ground protection system following time; Can produce a residual current through ground wire 10 and 7; Zero sequence current mutual inductor 15 can detect the residual current between phase, the zero line and export a signal and give amplifying circuit 14; And when residual current reaches predetermined threshold values (for example: 10 milliamperes); Amplifying circuit 14 triggers output and outputs signal to the 1st controllable silicon 13 trigger electrodes; And PNP triode 25 oppositely ends, thereby trigger 13 conductings of the 1st controllable silicon earth leakage protective device is threaded off, and before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4; And when the phase line 8 of load end, on the zero line 9 consuming device fault electric leakage and when not having ground connection (for example: the ground wire virtual connection causes no ground connection on the socket) in the ground protection system; Metal parts that consuming device exposes and earth leakage protective device ground wire 10 and 7 all can be with dangerous voltage; The detection loop of being made up of weak current detection inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 that is connected between earth leakage protective device power end ground wire 7 and the zero line 6 just has a weak current to flow through; Weak current detects inductor 18 secondary winding can export a signal to voltage comparator circuit 21 inverting inputs (-); And when weak current reaches predefined threshold values (for example: 10 microamperes); Detect the induction of inductor 18 secondary winding by weak current and export to the reference voltage of the signal voltage of voltage comparator circuit 21 inverting inputs (-) greater than voltage comparator circuit 21 in-phase input ends (+); Voltage comparator circuit 21 outputs just become low-voltage; 25 conductings of PNP triode; Thereby trigger 13 conductings of the 1st controllable silicon earth leakage protective device is threaded off, before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, thereby ensure people's Electrical Safety better.

Embodiment 4

Referring to shown in Figure 4, present embodiment is compared with embodiment 2, and the unidirectional output circuit of present embodiment adopts the 2nd controllable silicon 27.

In the present embodiment; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 connect, weak current is connected composition detection loop between ground wire 7 and the zero line 6 of power end; Weak current detects inductor 18 secondary winding one output and is connected with voltage comparator circuit 21 in-phase input ends (+); Weak current detects another output of inductor 18 secondary winding and is connected with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) respectively; The reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop; The 1st resistance 19 1 ends are connected with voltage stabilizing didoe 24 negative poles; The 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, and the 2nd resistance 20 other ends are connected with voltage comparator circuit 21 ground ends, voltage stabilizing didoe 24 positive poles respectively, and the 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends; Voltage comparator circuit 21 outputs are connected with the 2nd controllable silicon 27 trigger electrodes, and the anode of the 2nd controllable silicon 27 and negative electrode are connected in parallel with the anode and the negative electrode of the 1st controllable silicon 13 respectively.

In the present embodiment; Current limliting Resistor-Capacitor Unit 17 is a resistance; Also can adopt electric capacity or resistance and capacitance component, the iron core that weak current detects inductor 18 adopts the permalloy material to process, and also can adopt amorphous alloy or ultramicro-crystal alloy material to process; Weak current detects the detection loop that inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 be in series and is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected load end.

In the present embodiment, unidirectional output circuit is selected the 2nd controllable silicon 27 for use.

In the present embodiment, stabilized voltage power supply adopts voltage stabilizing didoe 24 voltage stabilizings, also can select the three terminal regulator voltage stabilizing for use or utilize the power end of amplifying circuit 14 and ground to hold voltage stabilizing.

In the present embodiment, the reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 provides after the dividing potential drop; Elected used weak current detects magnitude of voltage that inductor 18 secondary winding can exports bigger signal and stabilized voltage power supply when hanging down, also can be stabilized voltage power supply directly as the reference voltage of voltage comparator circuit 21, and cancel the 1st resistance 19 and the 2nd resistance 20.

Because present embodiment is compared with embodiment 2, it is different to be merely unidirectional output circuit, and remaining structure is formed all identical with embodiment 2 with circuit theory, repeats no more at this.

Embodiment 5

Referring to shown in Figure 5, present embodiment is compared with embodiment 4, and it is said to have cancelled embodiment 4 in the present embodiment

Amplifying circuit 14 in the drive circuit of magnetic coil 11.

A kind of earth leakage protective device mainly detects inductor the 18, the 1st resistance the 19, the 2nd resistance 20, electromagnetic trip and locker, voltage stabilizing didoe 24, voltage comparator circuit 21, unidirectional output circuit by the phase line 8 of the phase line 5 of shell, power end, zero line 6, ground wire 7, load end, zero line 9, ground wire 10, rectification circuit the 12, the 1st controllable silicon 13, zero sequence current mutual inductor 15, test loop 16, current limliting Resistor-Capacitor Unit 17, weak current to be formed, and electromagnetic trip and locker mainly are made up of solenoid 11 and drive circuit, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, spring, the push rod that resets.

In the present embodiment, the drive circuit of said solenoid 11 mainly is made up of rectification circuit the 12, the 1st controllable silicon 13.One output of said zero sequence current mutual inductor 15 secondary winding and another output respectively with the drive circuit of said solenoid 11 in the trigger electrode of the 1st controllable silicon 13 be connected with negative electrode, the anode of the 1st controllable silicon 13 is connected with negative pole (-) with the positive pole (+) of rectification circuit 12 outputs respectively with negative electrode.

In the present embodiment; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 connect, weak current is connected composition detection loop between ground wire 10 and the zero line 9 of load end; Weak current detects inductor 18 secondary winding one output and is connected with voltage comparator circuit 21 in-phase input ends (+); Weak current detects another output of inductor 18 secondary winding and is connected with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) respectively; The reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop; The 1st resistance 19 1 ends are connected with voltage stabilizing didoe 24 negative poles, and the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, and the 2nd resistance 20 other ends are connected with voltage comparator circuit 21 ground ends, voltage stabilizing didoe 24 positive poles respectively; The 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends; Unidirectional output circuit adopts the 2nd controllable silicon 27, and voltage comparator circuit 21 outputs are connected with the 2nd controllable silicon 27 trigger electrodes, and the anode of the 2nd controllable silicon 27 and negative electrode are connected in parallel with the anode and the negative electrode of the 1st controllable silicon 13 respectively.

In the present embodiment; Current limliting Resistor-Capacitor Unit 17 is a resistance; Also can adopt electric capacity or resistance and capacitance component, the iron core that weak current detects inductor 18 adopts the ultramicro-crystal alloy material to process, and also can adopt amorphous alloy or permalloy material to process; Weak current detects the detection loop that inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 be in series and is connected between the ground wire 10 and zero line 9 of load end, also can detect this between ground wire 7 and zero line 6 that loop is connected power end.

In the present embodiment, stabilized voltage power supply is selected voltage stabilizing didoe 24 voltage stabilizings for use, also can select the three terminal regulator voltage stabilizing for use.

Because present embodiment is compared with embodiment 4, it is different to be merely the drive circuit that drives solenoid 11, and remaining structure is formed all identical with embodiment 4 with circuit theory, repeats no more at this.

Embodiment 6

Referring to shown in Figure 6, present embodiment is compared with embodiment 5, and present embodiment has increased the 3rd resistance the 28, the 4th resistance the 29, the 2nd diode 30 in the drive circuit of solenoid 11.

A kind of earth leakage protective device mainly detects inductor the 18, the 1st resistance the 19, the 2nd resistance 20, electromagnetic trip and locker, voltage stabilizing didoe 24, voltage comparator circuit 21, unidirectional output circuit by the phase line 8 of the phase line 5 of shell, power end, zero line 6, ground wire 7, load end, zero line 9, ground wire 10, rectification circuit the 12, the 1st controllable silicon 13, zero sequence current mutual inductor 15, test loop the 16, the 3rd resistance the 28, the 4th resistance the 29, the 2nd diode 30, current limliting Resistor-Capacitor Unit 17, weak current to be formed, and electromagnetic trip and locker mainly are made up of solenoid 11 and drive circuit, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, spring, the push rod that resets.

In the present embodiment; The drive circuit of said solenoid 11 mainly is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 3rd resistance the 28, the 4th resistance the 29, the 2nd diode 30; The 3rd resistance 28 1 ends are connected with rectification circuit 12 output head anodes (+); The 3rd resistance 28 other ends are connected with the 4th resistance 29 1 ends; The 4th resistance 29 other ends and 30 anodal connections of the 2nd diode; The 2nd diode 30 negative poles are connected with rectification circuit 12 negative pole of output end (-), and the 3rd resistance 28 other ends also are connected with voltage stabilizing didoe 24 negative poles with the tie point of the 4th resistance 29 1 ends, and voltage stabilizing didoe 24 positive poles are connected with rectification circuit 12 negative pole of output end (-); One output of said zero sequence current mutual inductor 15 secondary winding and another output respectively with the drive circuit of said solenoid 11 in the 1st controllable silicon 13 trigger electrodes and 30 anodal connections of the 2nd diode, the anode of the 1st controllable silicon 13 is connected with negative pole (-) with the positive pole (+) of rectification circuit 12 outputs respectively with negative electrode.

In the present embodiment; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 connect, weak current is connected composition detection loop between ground wire 7 and the zero line 6 of power end; Weak current detects inductor 18 secondary winding one output and is connected with voltage comparator circuit 21 in-phase input ends (+); Weak current detects another output of inductor 18 secondary winding and is connected with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) respectively; The reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop; The 1st resistance 19 1 ends are connected with voltage stabilizing didoe 24 negative poles, and the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, and the 2nd resistance 20 other ends are connected with voltage comparator circuit 21 ground ends, voltage stabilizing didoe 24 positive poles respectively; The 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends; Unidirectional output circuit adopts the 2nd controllable silicon 27, and voltage comparator circuit 21 outputs are connected with the 2nd controllable silicon 27 trigger electrodes, and the anode of the 2nd controllable silicon 27 and negative electrode are connected in parallel with the anode and the negative electrode of the 1st controllable silicon 13 respectively.

In the present embodiment, voltage comparator circuit 21 adopts operational amplifier, also can adopt voltage comparator.

Because present embodiment is compared with embodiment 5, it is different to be merely the drive circuit that drives solenoid 11, and remaining structure is formed all identical with embodiment 5 with circuit theory, repeats no more at this.

Claims

1. earth leakage protective device; Include zero sequence current mutual inductor, test loop, electromagnetic trip and locker that shell, phase line, zero line, ground wire, phase line and zero line all pass; This electromagnetic trip and locker comprise solenoid and drive circuit thereof, contact; The drive circuit of said solenoid mainly is made up of rectification circuit, the 1st controllable silicon; One output of said zero sequence current mutual inductor secondary winding and another output are connected with another input with an input of the drive circuit of said solenoid respectively, it is characterized in that: also be provided with weak current and detect inductor, voltage comparator circuit, unidirectional output circuit; Said weak current detects inductor and is provided with iron core, elementary winding and secondary winding; Said weak current detects the elementary winding of inductor and said weak current detection inductor secondary winding all detects on the inductor iron core around said weak current, between ground wire and zero line, is connected with the detection loop that is in series by said weak current detection elementary winding of inductor and current limliting Resistor-Capacitor Unit; Import said voltage comparator circuit one input from the reference voltage that stabilized voltage power supply obtains; Said weak current detects inductor secondary winding one output and is connected with another input of said voltage comparator circuit; Said weak current detects another output of inductor secondary winding and is connected with said rectification circuit output end negative pole, and said voltage comparator circuit output is connected with the drive circuit of solenoid through said unidirectional output circuit.

2. earth leakage protective device according to claim 1; It is characterized in that: in the drive circuit of said solenoid, also be provided with amplifying circuit; One input of the drive circuit of said solenoid and another input are respectively an input and another input of said amplifying circuit, and said amplifying circuit triggers the signal of output output and sends into the 1st controllable silicon trigger electrode.

3. earth leakage protective device according to claim 1 is characterized in that: an input of the drive circuit of said solenoid and another input are respectively said the 1st silicon controlled trigger electrode and negative electrode.

4. earth leakage protective device according to claim 1; It is characterized in that: in the drive circuit of said solenoid, also be provided with the 3rd resistance, the 4th resistance, the 2nd diode; Said the 3rd resistance one end is connected with said rectification circuit output end is anodal; The 3rd resistance other end is connected with the 4th resistance one end, and the 4th resistance other end is connected with the 2nd diode cathode, and the 2nd diode cathode is connected with said rectification circuit output end negative pole; The 3rd resistance other end is connected with the voltage stabilizing didoe negative pole with the tie point of the 4th resistance one end, and voltage stabilizing didoe is anodal to be connected with the rectification circuit output end negative pole; One input of the drive circuit of said solenoid and another input are respectively said the 1st controllable silicon trigger electrode and said the 2nd diode cathode.

5. earth leakage protective device according to claim 1 is characterized in that: said current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.

6. earth leakage protective device according to claim 1 is characterized in that: said weak current detects the inductor iron core and is processed by permalloy or amorphous alloy or ultramicro-crystal alloy material.

7. earth leakage protective device according to claim 1 is characterized in that: said weak current detects between ground wire and the zero line that detection loop that the elementary winding of inductor and current limliting Resistor-Capacitor Unit be in series is connected power end or is connected between the ground wire and zero line of load end.

8. earth leakage protective device according to claim 1; It is characterized in that: also be provided with the 1st resistance, the 2nd resistance; The loop that said the 1st resistance and the 2nd resistance are in series is connected between the end and the other end of stabilized voltage power supply, and the 1st resistance one end is connected with stabilized voltage power supply one end, and the 1st resistance other end is connected with the 2nd resistance one end; The 2nd resistance other end is connected with the stabilized voltage power supply other end, and said reference voltage is obtained from the tie point of the 1st resistance other end and the 2nd resistance one end.

9. according to claim 1 or 8 described earth leakage protective devices, it is characterized in that: said reference voltage is sent into said voltage comparator circuit one input, and this input is the inverting input of voltage comparator circuit; Said weak current detects inductor secondary winding one output and is connected with another input of said voltage comparator circuit, and this input is the in-phase input end of voltage comparator circuit.

10. according to claim 1 or 8 described earth leakage protective devices, it is characterized in that: said reference voltage is sent into said voltage comparator circuit one input, and this input is the in-phase input end of voltage comparator circuit; Said weak current detects inductor secondary winding one output and is connected with another input of said voltage comparator circuit, and this input is the inverting input of voltage comparator circuit.

11. earth leakage protective device according to claim 9; It is characterized in that: said unidirectional output circuit is made up of the 1st diode; The output of said voltage comparator circuit is connected with said the 1st diode cathode, and said the 1st diode cathode is connected with said the 1st controllable silicon trigger electrode.

12. earth leakage protective device according to claim 9; It is characterized in that: said unidirectional output circuit is made up of the NPN triode; The output of said voltage comparator circuit is connected with said NPN transistor base; Said NPN transistor emitter is connected with said the 1st controllable silicon trigger electrode, and said NPN transistor collector is connected with stabilized voltage power supply one end.

13. earth leakage protective device according to claim 10; It is characterized in that: said unidirectional output circuit is made up of the PNP triode; The output of said voltage comparator circuit is connected with said PNP transistor base; Said PNP transistor collector is connected with said the 1st controllable silicon trigger electrode, and said PNP transistor emitter is connected with stabilized voltage power supply one end.

14. earth leakage protective device according to claim 9; It is characterized in that: said unidirectional output circuit is made up of the 2nd controllable silicon; The output of said voltage comparator circuit is connected with the 2nd controllable silicon trigger electrode, and the 2nd silicon controlled anode and negative electrode are connected in parallel with said the 1st silicon controlled anode and negative electrode respectively.

15. earth leakage protective device according to claim 1 is characterized in that: the negative pole that an end of said stabilized voltage power supply and the other end are respectively voltage stabilizing didoe is with anodal.

16. earth leakage protective device according to claim 1 is characterized in that: output that an end of said stabilized voltage power supply and the other end are respectively three terminal regulator and ground end.

17. earth leakage protective device according to claim 1 is characterized in that: power end that an end of said stabilized voltage power supply and the other end are respectively said amplifying circuit and ground end.

18. earth leakage protective device according to claim 1 is characterized in that: said voltage comparator circuit is a voltage comparator exclusive disjunction amplifier.