CN106486961B - Leakage circuit breakers - Google Patents
Leakage circuit breakers Download PDFInfo
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- CN106486961B CN106486961B CN201610085663.7A CN201610085663A CN106486961B CN 106486961 B CN106486961 B CN 106486961B CN 201610085663 A CN201610085663 A CN 201610085663A CN 106486961 B CN106486961 B CN 106486961B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- Breakers (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The present invention relates to a kind of leakage circuit breakers, even if leakage circuit breakers can be made to carry out open circuit if in the case where pressure test etc. is applied continuously in overvoltage to alternating current circuit, prevent the failure of built-in power circuit.The leakage circuit breakers has：Opening and closing contact (2) makes alternating current circuit (1) be opened and closed；Over-current detector (3) is detected the overcurrent of alternating current circuit (1)；Leakage meter (4) is detected the leakage current of alternating current circuit (1)；Overcurrent trip element (7), the signal detected based on over-current detector (3) make opening and closing contact (2) disconnect；And leakage tripping element (8), it, which is based on the signal of leakage meter (4) detected, makes opening and closing contact (2) disconnect, the leakage circuit breakers also has overvoltage detection circuit (34), the overvoltage detection circuit is detected the overvoltage for coming from alternating current circuit (1), and drives overcurrent trip element (7).
Description
Technical field
The present invention relates to the leakage currents in circuit to become larger than or leakage, breaking that equal to specified value when disconnects the circuit
Device, more particularly to overcurrent trip mode are the leakage circuit breakers of electronic type.
Background technology
The power circuit being built in leakage circuit breakers, in the alternating voltage (such as AC100V) that will be supplied from alternating current circuit
After being transformed to DC voltage using rectification circuit, the DC voltage after rectification is transformed to more low-voltage using reduction voltage circuit
DC voltage (such as DC24V), as electric-leakage detection circuit, tripgear driving power and supplied.
In such power circuit, surge voltage is induced due to lightning stroke, arcing ground etc. in alternating current circuit
In the case of, it needs that electric-leakage detection circuit, tripgear is protected to influence from the surge voltage.
As the protection location, there are a kind of power circuit (for example, referring to patent documents 1), are provided with：Voltage detecting
Circuit detects surge voltage according to the output voltage of rectification circuit；Booster circuit detects wave in the voltage detecting circuit
When gushing voltage, the output voltage of reduction voltage circuit is made to boost；And current sink circuit, the outlet side in reduction voltage circuit is set,
As defined in reaching in the output voltage of reduction voltage circuit when value, surge current is absorbed.
Patent document 1：Japanese Unexamined Patent Publication 2009-95125 bulletins
In the power circuit of existing leakage circuit breakers, in the case where inducing surge voltage, booster circuit is utilized
So that the output voltage of reduction voltage circuit is boosted, makes electric current from absorption surge when the output voltage of reduction voltage circuit has reached defined value
The current sink circuit of electric current passes through, to be clamped at constant voltage, prevent constitute electric-leakage detection circuit component due to
Overvoltage and break down.The pulse width for imagining surge voltage is usually maximum also with regard to being several m seconds.It is of course possible to pass through decompression
Circuit, current sink circuit energy there are the limit, therefore can be more than pole in the case where being applied continuously in overvoltage
Limit, causes the failure of reduction voltage circuit, current sink circuit.
Following situations can be considered, that is, as the above-mentioned possibility for being applied continuously in overvoltage, carrying leakage circuit breakers
Control panel etc. in, in order to confirm the alternate and alternating current circuit and the earth (that include alternating current circuit including leakage circuit breakers
Ball) between in insulation, implement pressure test (for example, 2000V 1 minute).
In general, if leakage circuit breakers is in this way, in the case of the product that circuit is connect with electronic circuit, forbid carrying out alternate
Pressure test, only alternating current circuit and the earth (earth) between implement pressure test.Therefore, not to alternate application overvoltage.
However, as shown in fig. 6, if leakage circuit breakers is connected with load circuit, via the equipment connected between the earth (for example, wave
Gush and absorb electricity container, noise filter etc.), the static capacity over the ground of electric wire and be unexpectedly applied continuously in electricity alternate
Pressure, as a result, the power circuit for occasionally resulting in leakage circuit breakers generates failure.
Invention content
The present invention proposes that its object is to obtain a kind of leakage, breaking in order to solve above-mentioned such project
Device, the leakage circuit breakers have for the defencive function for applying continuous overvoltage.
The present invention has：Opening and closing contact makes circuit be opened and closed；Over-current detector examines the overcurrent of circuit
It surveys；Leakage meter is detected the leakage current of circuit；Overcurrent trip element, based on over-current detector
The signal detected makes opening and closing contact disconnect；And leakage tripping element, the signal detected based on leakage meter
So that opening and closing contact is disconnected, the present invention have overvoltage detection circuit, the overvoltage detection circuit to the overvoltage from circuit into
Row detection, and drive overcurrent trip element.
The effect of invention
The present invention has the Zenith tracking driven to overcurrent trip element in the overvoltage for detecting circuit
Circuit, therefore when detecting continuous overvoltage, leakage circuit breakers carries out overcurrent trip, protects leakage circuit breakers from mistake
Voltage influence, and can be by pressure test when caused by overvoltage tripping be different from leakage tripping.
Description of the drawings
Fig. 1 is the overall structure figure for the structure for indicating the leakage circuit breakers in embodiments of the present invention 1.
Fig. 2 is the circuit diagram for the details for indicating the power circuit in Fig. 1.
Fig. 3 is the circuit diagram for the details for indicating the trigger circuit in Fig. 2.
Fig. 4 is the circuit diagram for the power circuit for indicating the leakage circuit breakers in embodiments of the present invention 2.
Fig. 5 is the circuit diagram of an example of the details for indicating integrating circuit shown in Fig. 4.
Fig. 6 is for the circuit diagram in the case of by the way that existing leakage circuit breakers to be assembled in control panel, to this hair
The definition graph that bright project illustrates.
The explanation of label
2 opening and closing contacts, 3 over-current detectors, 4 leakage meters, 5 detection circuits, 6 power circuits, 7 is excessively electric
Flow trip component, 8 leakage tripping elements, 9 electricity leakage indicators, 10 the 1st switch units, 11 the 2nd switch units, 12 trippings
Mechanism, the 2nd Zener diodes of 22d, 23m monitoring circuits, 23d trigger circuits, 100 leakage circuit breakers.
Specific implementation mode
Embodiment 1.
Fig. 1 is the circuit of the structure of the leakage circuit breakers for the power circuit for indicating to be utilized in embodiments of the present invention 1
Figure, Fig. 2 is the circuit diagram for the details for indicating the power circuit in Fig. 1, and Fig. 3 is the electricity for the details for indicating the trigger circuit in Fig. 2
Lu Tu.
In Fig. 1, leakage circuit breakers 100 has：Opening and closing contact 2 makes alternating current circuit 1 be opened and closed；Over-current detector 3,
It is detected the overcurrent of alternating current circuit 1；Leakage meter 4 is inserted into alternating current circuit 1, is carried out to leakage current
Detection；Detection circuit 5, the detection signal based on over-current detector 3 and leakage meter 4 is to overcurrent or electric leakage
It is detected；Power circuit 6 is connect with alternating current circuit 1, uses the switch transformer for driving testing circuit 5；Overcurrent
Trip component 7, when overcurrent flows through alternating current circuit 1, according to the output signal of detection circuit 5 via the 1st switch unit 10
It is pressed, opening and closing contact 2 is disconnected；Leakage tripping element 8 detects the electric leakage bigger than specified value in leakage meter 4
When stream, it is pressed via the 2nd switch unit 11 according to the output signal of detection circuit 5, opening and closing contact 2 is disconnected；And electric leakage
Display 9 shows to user and is leaked electricity when leakage tripping element 8 has carried out action.
If leakage circuit breakers 100 is closed a floodgate, opening and closing contact 2 is closed, then it is disconnected to be applied in electric leakage for the voltage of alternating current circuit 1
Power circuit 6 set by the load-side of road device 100, power circuit 6 is to 5 supply line voltage of detection circuit.
Here, the electric current of alternating current circuit 1 is monitored via over-current detector 3 by detection circuit 5.Detect it is different
In the case of normal electric current, detection circuit 5 connects the 1st switch unit 10 and drives overcurrent trip element 7, makes leakage circuit breakers
100 trippings.
In the case where flowing through leakage current, leakage meter 4 will detect signal output and be input to detection circuit 5.
It is judged as in the case of flowing through the leakage current more than or equal to specified value, detection circuit 5 connects the 2nd switch unit 11 and drives leakage
Electric tripping element 8 makes leakage circuit breakers 100 trip.At this point, the electricity leakage indicator 9 to link with leakage tripping element 8 is also into action
Make, is shown to user and electric leakage accident has occurred.
The structure of power circuit 6 is illustrated in fig. 2.
Power circuit 6 has：Current-limiting resistance 20 connect with alternating current circuit 1, limits electric current；Rectification circuit 21
(for example, the rectification circuit realized using diode bridge), is attached via the current-limiting resistance 20, will exchange full-wave rectification
For direct current；Reduction voltage circuit 22 is connect with the outlet side of rectification circuit 21, includes that field-effect transistor 22a (is hereinafter referred to as
FET)；And Switching Power Supply 23, it includes the switch transformer 23a for having the back segment with the reduction voltage circuit 22 to be connected.
Reduction voltage circuit 22 has：Drain electrode is connect by FET 22a with the output cathode side of rectification circuit 21；1st Zener two
Cathode is connect by pole pipe 22b with the grid of FET 22a；1st resistance 22c, be connected to the drain electrode of FET 22a and grid it
Between；Anode is connect by the 2nd Zener diode 22d with the grid of FET 22a, and the electricity of the 2nd Zener diode 22d and the 1st
Resistance 22c is connected in parallel；2nd resistance 22e is connected to the output negative pole of the anode and rectification circuit 21 of the 1st Zener diode 22b
Between side；And the 3rd Zener diode 22f, cathode are connect with the source electrode of FET 22a, anode is defeated with rectification circuit 21
Go out negative side connection.
Here, the resistance value of the 1st resistance 22c is set as hundreds of k~a few M Ω or so, the resistance value of the 2nd resistance 22e is set
For tens~hundreds of Ω or so, and keep the Zener voltage of the 2nd Zener diode 22d bigger than the output voltage of rectification circuit 21.
Switching Power Supply 23 is by switch transformer 23a, switch element 23b, switch driver 23c and trigger circuit 23d etc.
It constitutes.
Switch transformer 23a has：1st winding 23a1, one end are connect with the drain electrode of FET 22a, the other end and switch
The drain electrode of element 23b connects；2nd winding 23a2, one end are connect with the anode of diode 23e, the other end and rectification circuit 21
Output negative pole side connection；And the 3rd winding 23a3, one end are connect with the anode of diode 23f, the other end and Switching Power Supply
23 primary side grounding connection.
Switch driver 23c has：First control terminal 23c1 connects with the cathode of diode 23e and diode 23g
It connects；Second control terminal 23c2 is connect with the output negative pole side of rectification circuit 21；Leading-out terminal 23c3, with FET 22a's
Grid connects；And monitoring terminal 23c4, it is connect with trigger circuit 23d.
In addition, being connected with the cathode of Zener diode 23h to the first control terminal 23c1 of switch driver 23c, this is neat
The anode of diode 23h of receiving is connected with the output negative pole side of rectification circuit 21, the source of the anode and FET 22a of diode 23g
Pole is connected.
As shown in figure 3, trigger circuit 23d has：Diode 23d1, anode and the 2nd resistance 22e and two pole of the 1st Zener
The tie point of pipe 22b is connected；Resistance 23d2, one end are connected with diode 23d1 cathodes；Transistor 23d3, base stage with
The other end of resistance 23d2 connects, and emitter is connect with the output negative pole side of rectification circuit 21；Capacitor 23d4, is connected to
Between diode 23d1 cathodes and the output negative pole side of rectification circuit 21；Resistance 23d5, the collection of one end and transistor 23d3
Electrode connects, and the other end is connect with the monitoring terminal 23c4 of switch driver 23c；And resistance 23d6, it is connected to transistor
Between the base stage and emitter of 23d3.
There are following effects by the integrating circuit that resistance 23d2 and capacitor 23d4 are constituted, that is, open from voltage detecting circuit
Initiating has been made after have passed through the defined time, and transistor 23d3 is made to be connected.
In addition, being additionally provided with：Diode 23i, anode are connect with one end of the 2nd winding 23a2；Resistance 23j, one end
It is connect with the cathode of diode 23i, the other end is connect with monitoring terminal 23c4；And resistance 23k, it is connected to resistance 23j's
Between the other end and the output negative pole side of rectification circuit 21.
If the transistor 23d3 conductings of trigger circuit 23d, the application to the monitoring terminal 23c4 of switch driver 23c
Voltage can change.Specifically, in the transistor 23d3 conductings of trigger circuit 23d, because being connected to monitoring terminal
Resistance 23k between 23c4 and the output negative pole side of rectification circuit 21, it is connected in parallel with the resistance 23d5 of trigger circuit 23d, institute
It is changed with circuit constant so as to reduce to the application voltage of 23c4.
To the cathode of the diode 23f of the primary side of switch transformer 23a is connected with overcurrent trip element 7, electric leakage is jumped
Lock element 8, is configured to, and is supplied electric power to overcurrent trip element 7 via the 1st switch unit 10 when overcurrent has occurred,
It is supplied electric power to leakage tripping element 8 via the 2nd switch unit 11 when electric leakage has occurred, so that leakage circuit breakers 100 carries out
Trip operation.In addition, constant voltage circuit 33 and monitoring circuit 23m are also connect with the cathode of diode 23f, wherein constant voltage circuit
33 generate voltages appropriate so that detection of excessive current, the detection circuit 5 of signal of electric leakage are acted, and monitoring circuit 23m is split
The voltage for closing the primary side of transformer 23a is monitored.
In addition, " voltage detecting circuit " refers to the 2nd above-mentioned Zener diode 22d, " mistake in detail in the claims
Voltage detecting circuit " refers to above-mentioned the 2nd Zener diode 22d, trigger circuit 23d and monitoring circuit 23m.
Action is illustrated below.
In the normal state, if supplying the alternating voltage of AC100V~400V or so from alternating current circuit 1, in current limliting electricity
The electric current Ia that exchange is flowed in resistance 20, is transformed to DC voltage Vb in rectification circuit 21.Pass through what is exported from rectification circuit 21
Electric current Ib, it is electric to the 1st Zener diode 22b (for example, Zener voltage 20V) and the 2nd resistance 22e flowings via the 1st resistance 22c
Flow Ic.On the other hand, the DC voltage due to the Zener voltage (for example, 800V) of the 2nd Zener diode 22d than rectification circuit 21
Vb is set to height, therefore the 2nd Zener diode 22d is not turned on, and electric current will not be via the 2nd Zener diode 22d to the 1st Zener two
Pole pipe 22b and the 2nd resistance 22e flowings.
At this point, the resistance value of the 1st resistance 22c is for example greatly to hundreds of k~a few M Ω, and corresponding thereto, the resistance of the 2nd resistance 22e
Value is for example small to tens~hundreds of Ω, therefore the electric current Ic flowed in the 2nd resistance 22e is determined by the 1st resistance 22c, e.g.
The small electric current of tens μ of μ A~hundreds of A.Therefore, it is possible to ignore the voltage drop of the 2nd resistance 22e substantially.As a result, if will apply
It is added in the voltage of the concatermer of the 1st Zener diode 22b and the 2nd resistance 22e, i.e. the grid voltage of FET 22a is set as Vc, then becomes
For Vc ≈ (Zener voltage of the 1st Zener diode 22b).
In addition, the output voltage Vd of FET 22a be Vd=Vc- (conducting voltage of FET 22a), but as described above, because
Vc ≈ (Zener voltage of the 1st Zener diode 22b), so Vd ≈ (Zener voltage of the 1st Zener diode 22b)-(FET
The conducting voltage of 22a), become the supply voltage of switch driver 23c.
The output voltage Vd of FET 22a is under the situation for the alternating voltage for being fed with AC100V~400V or so, not surpass
The mode for crossing the Zener voltage of the 3rd Zener diode 22f is set, and thus the 3rd Zener diode 22f is not turned on, and is not flowed
Electric current Id.
In addition, though apply the voltage of the tie point of the 1st Zener diode 22b and the 2nd resistance 22e to trigger circuit 23d,
But since the both end voltage of resistance 22e is small voltage, the forward voltage of connected diode 23d1 is not exceeded
(0.7V or so), not streaming current, to which transistor 23d3 is not turned on.
The alternating voltage of AC100V~400V or so is transformed to be suitable for the direct current of driving switch driver 23c as a result,
Voltage makes switch driver 23c be acted.The leading-out terminal 23c3 driving switch elements 23b of switch driver 23c, it is split
The charge and discharge for closing the 1st winding 23a1 of transformer 23a are controlled.As switch driver 23c is acted, switch transformer
The output voltage of the 2nd winding 23a2 and the 3rd winding 23a3 of 23a gradually rise, but due to the output of the 2nd winding 23a2 electricity
Pressure is connected with monitoring terminal 23c4, so if confirming the output more than set voltage, then switch driver 23c stops
Only to the output of switch element 23b, the output voltage of the 2nd winding 23a2 and the 3rd winding 23a3 is thus reduced.
With the reduction of output voltage, the voltage being applied on the monitoring terminal 23c4 of switch driver 23c is got lower than
Set voltage makes the output of the 2nd winding 23a2 and the 3rd winding 23a3 to start again at the output to switch element 23b
Voltage rises.
Being repeated by the above process, the output voltage of the 2nd winding 23a2 and the 3rd winding 23a3 can be kept constant
Value (for example, DC 20V).In addition, be applied to monitoring terminal 23c4 voltage can by using electric resistance partial pressure and in detail into
Row setting.
The output voltage of 3rd winding 23a3 as overcurrent trip element 7, leakage tripping element 8 driving power and by
It makes full use of.In addition, via constant voltage circuit 33 supply to overcurrent, electric leakage be detected detection circuit 5 power supply (for example,
DC 5V).In this state, it has been more than defined value in the output signal from over-current detector 3, leakage meter 4
In the case of, detection circuit 5 makes the 1st switch unit 10, the 2nd switch unit 11 connect, and exciting current is to overcurrent trip element
7, leakage tripping element 8 flows, and operates the tripping mechanism 12 of leakage circuit breakers 100 and opening and closing contact 12 is made to detach.
In the following, the case where to being superimposed continuous overvoltage in alternating current circuit 1, illustrates.
If being applied continuously in the overvoltage of several kV to alternating current circuit 1, due to be applied to the 2nd Zener diode 22d with
The application voltage of the series circuit of 1st Zener diode 22b is more than the 2nd Zener diode 22d's and the 1st Zener diode 22b
The aggregate value of Zener voltage detects overvoltage, therefore the 2nd Zener diode 22d becomes being connected.
At this point, the electric current Ic flowed in the 2nd resistance 22e becomes greatly tens compared with tens μ of μ A~hundreds of A when usual
MA generates voltage drop in the 2nd resistance 22e, and the voltage Vc for being applied to the 2nd resistance 22e and the 1st Zener diode 22b rises.Example
Such as, if the resistance value of the 2nd resistance 22e is 100 Ω or so, and electric current Ic is 40mA or so, the then voltage drop of the 2nd resistance 22e
Become 4V or so, is applied to the voltage Vc and common state (such as 20V) phase of the 2nd resistance 22e and the 1st Zener diode 22b
Than getting higher 4V or so.The output voltage of FET 22a similarly gets higher 4V or so as a result, due to more than the 3rd Zener diode
The Zener voltage (for example, 23V) of 22f, therefore the 3rd Zener diode 22f conductings, the output voltage Vd of FET 22a are suppressed to
The Zener voltage of 3rd Zener diode 22f.
At this point, both end voltage, that is, 4V or so due to applying the 2nd resistance 22e to trigger circuit 23d as described above,
More than the forward voltage of diode 23d1, electric current flowing, therefore constitute the capacitor 23d4 quilts of the integrating circuit of trigger circuit 23d
It charges.Due to being superimposed with continuous overvoltage, the voltage of capacitor 23d4 is charged to specified value (for example, 3V),
Transistor 23d3 conductings.
Due to being connected by transistor 23d3, resistance 23d5 becomes to be connected in parallel with resistance 23k, therefore resistance 23j is opposite
Change in resistance 23d5 and resistance 23k's and disjunctor intrinsic standoff ratio, end is monitored to the tie point of resistance 23j and resistance 23k
The application voltage of sub- 23c4 reduces.
Therefore, even if the switch transformer 23a that in the normal state driving of switch element 23b should be stopped
Output voltage, switch driver 23c also can persistent switch element 23b driving, the output voltage of the 3rd winding 23a3 with usually
Voltage compared to rise.
It is as described above described, if being superimposed continuous overvoltage, the output voltage of the primary side of switch transformer 23a
The higher voltage compared with usual state can be exported.Monitoring circuit 23m detects the primary side of switch transformer 23a as a result,
The rising of output voltage makes the 1st switch unit 10 be connected, therefore is driven to tripping mechanism 12 via overcurrent trip element 7
Dynamic, opening and closing contact 2 is that leakage circuit breakers 100 carries out overcurrent trip.Moreover, because opening and closing contact 2 forms open circuit, therefore stop
Power supply to power circuit 6.
So that load current is powered to control panel in the pressure test of control panel, only carries out the electricity using compression tester
Pressure applies.Therefore, if there is insulation fault etc., then detection circuit 5 detects to leak electricity, and leakage circuit breakers 100 carries out electric leakage jump
Lock.At this point, the electricity leakage indicator 9 to link with leakage tripping element 8 is also acted, is shown to user and electric leakage thing has occurred
Therefore.
If detecting overvoltage herein, leakage tripping element 8 is made to be acted and leakage circuit breakers 100 is made to leak electricity
Tripping, then since electricity leakage indicator 9 is also acted, user cannot differentiate since electric leakage causes to trip, or by
Tripping caused by overvoltage.
On the other hand, to the electric current of flowing there is limitation in compression tester, and cannot supply makes leakage circuit breakers 100 carry out
The electric current of current trip degree.Therefore, breaker cannot be made to carry out overcurrent trip in pressure test.That is, in pressure test
When by making leakage circuit breakers 100 carry out the tripping caused by overcurrent by the action of no electricity leakage indicator 9, to as logical
Normal unimaginable state.Thereby, it is possible to promote prompting user to notice test method, there are mistakes.
In the following, the case where to being superimposed instantaneous surge voltage in alternating current circuit 1, illustrates.
If being superimposed the surge voltage of several kV in alternating current circuit 1, it is applied to the 2nd Zener diode 22d and the 1st Zener
The application voltage of the series circuit of diode 22b, the Zener electricity more than the 2nd Zener diode 22d and the 1st Zener diode 22b
The aggregate value of pressure, due to detecting that overvoltage, the 2nd Zener diode 22d also become being connected.
At this point, the electric current Ic flowed in the 2nd resistance 22e becomes greatly tens compared with tens μ of μ A~hundreds of A when usual
MA, generates voltage drop in the 2nd resistance 22e, and the voltage Vc that the 2nd resistance 22e and the 1st Zener diode 22b are born rises.Example
If if the resistance value of the 2nd resistance 22e is 100 Ω or so, and electric current Ic is 40mA or so, then the voltage drop of the 2nd resistance 22e becomes
For 4V or so, the voltage Vc that the 2nd resistance 22e and the 1st Zener diode 22b are born gets higher the left sides 4V compared with common state
It is right.Since the output voltage of FET 22a similarly gets higher 4V or so, more than the Zener voltage of the 3rd Zener diode 22f, because
The output voltage Vd of the 22f conductings of this 3rd Zener diode, FET 22a is suppressed to the Zener electricity of the 3rd Zener diode 22f
Pressure.
At this point, both end voltage, that is, 4V or so due to applying the 2nd resistance 22e to trigger circuit 23d, is more than diode
The forward voltage of 23d1, electric current flowing are charged to constitute the capacitor 23d4 of integrating circuit of trigger circuit 23d.
If the voltage in capacitor 23d4 fully rises, transistor 23d3 conductings, then to the monitoring terminal of switch driver 23c
In the case that variation has occurred in the application voltage of 23c4, then according to aftermentioned reason and leakage circuit breakers 100 carry out trip operation,
But since the time of superposition surge voltage is very short (for example, 1~2msec), capacitor 23d4, which is not sufficiently carried out, to be filled
Electricity, therefore transistor 23d3 is not turned on.
As described above, although leakage circuit breakers 100, without tripping action, the output voltage of power circuit 6 can be pressed down
It is made as the Zener voltage of the 3rd Zener diode 22f, protects detection circuit 5 is equal to be influenced from surge voltage.
According to the present embodiment, because having when detecting the overvoltage of alternating current circuit 1 via overcurrent trip element 7
To the monitoring circuit 23m that tripping mechanism 12 is driven, so leakage circuit breakers 100 carried out electricity when continuously applying overvoltage
Stream tripping, can protect leakage circuit breakers 100 from over-voltage protection.
In addition, in pressure test, jumped by the overcurrent for making leakage circuit breakers 100 carry out 9 attonity of electricity leakage indicator
Lock becomes the usually unimaginable state in pressure test, and electric leakage jump is different from so as to trip caused by overvoltage
Lock.
In addition, in the present embodiment, circuit is illustrated for the case where alternating current circuit, but if as overcurrent
Detector 3 and use also can be detected using the direct current of Hall element current detecting, as leakage meter 4 and
Using the sensor that can be detected to the leakage current of direct current as such as fluxgate sensor, then obviously can be suitable for
DC circuit.
Embodiment 2.
Fig. 4 is the circuit diagram for the power circuit for indicating the leakage circuit breakers 101 in embodiment 2, and Fig. 5 is to indicate Fig. 4 institutes
The circuit diagram of one example of the details of the integrating circuit shown.
In the embodiment 1, show to have used the example of the power circuit 6 of the insulated type of switch transformer 23a, but at this
In embodiment, replaces the power circuit 6 of insulated type and used the power circuit 61 of nonisulated type.Other structures because with
Embodiment 1 is identical, so omitting the description.
The alternating voltage inputted from alternating current circuit 1 is transformed to defined DC voltage and is jumped to overcurrent by power circuit 61
Lock element 7 and leakage tripping element 8 supply exciting current, and are transformed to using constant voltage circuit 33 more defeated than power circuit 61
Go out the low defined voltage of voltage, powers to detection circuit 5.
In the following, being illustrated to the details of power circuit 61.
The power circuit 61 is connect with alternating current circuit 1, is connected with by two poles in the back segment of the current-limiting resistance 20 of limitation electric current
The rectification circuit 21 that tube bridge is constituted.The reduction voltage circuit for making its output voltage be depressured is connected in the outlet side of the rectification circuit 21
53, which is made of components described below：Field-effect transistor (in the following, being denoted as FET) 53a, drain electrode and rectification circuit
21 output cathode side connection；The output of 4th Zener diode 53b, the grid for being connected to FET 53a and rectification circuit 21 are negative
Between the side of pole；And resistance 53c (resistance value is hundreds of k~a few M Ω or so), it is connected to the 4th Zener diode 53b supplies
Between the drain electrode and grid of the FET 53a of Zener current.
With the resistance 53c of reduction voltage circuit 53 be connected in parallel to the 5th Zener diode 54 (Zener voltage ＞ rectification circuits 21
Output voltage) i.e. voltage detecting circuit, using the 5th Zener diode 54, according to the output voltage of rectification circuit 21 to surge
Voltage is detected.Between the grid of FET 53a and the output negative pole side of rectification circuit 21, it is connected with and two pole of the 4th Zener
Resistance 55 (resistance value is tens~hundreds of Ω or so) the i.e. booster circuit that pipe 53b is attached in series, in two pole of the 5th Zener
When pipe 54 detects surge voltage, the output voltage of reduction voltage circuit 53 is set to increase using the resistance 55.FET 53a source electrode with
Between the output negative pole side of rectification circuit 21, it is connected with the 6th Zener diode 56 i.e. current sink circuit, in reduction voltage circuit 53
When output voltage has reached Zener voltage i.e. 1 specified value of the 6th Zener diode 56, absorbed using the 6th Zener diode 56
Surge current.
In addition, the output end in power circuit 61 is provided with overvoltage detection circuit 57, the overvoltage detection circuit 57 with
6th Zener diode 56 is connected in parallel, if persistently inputting overvoltage from alternating current circuit 1 up to reaching the stipulated time, via
1st switch unit 10 drives overcurrent trip element 7.
Overvoltage detection circuit 57 is made of following part：7th Zener diode 57a is (for example, Zener voltage is 23V left
It is right), cathode is connect with the cathode of the 6th Zener diode 56, when the output voltage of reduction voltage circuit 53 has been more than 2 specified value
Conducting；Integrating circuit 57b, input terminal and the anode of the 7th Zener diode 57a and the anode of the 6th Zener diode 56
Connection；And comparison circuit 57c, the output to integrating circuit 57b be more than specified value, i.e. power circuit 61 output electricity
Pressure reaches the output voltage of the 2nd assigned voltage and power circuit 61, and to reach the time of the 2nd assigned voltage be more than the stipulated time
The case where (such as 20msec), is detected, and drives the 1st switch unit 10.
As shown in figure 5, integrating circuit 57b is made of components described below：(resistance value is 1k Ω~10k Ω left to resistance 57b1
It is right), one end is connect with the anode of the 7th Zener diode 57a；Capacitor 57b2 (capacity is 0.1 μ F~a few μ F or so), one
End is connect with the other end of resistance 57b1, and the other end of capacitor 57b2 is connect with the anode of the 6th Zener diode 56；With
And resistance 57b3 (resistance value be 1k Ω~10k Ω or so), be attached in parallel with capacitor 57b2, and both ends with
Comparison circuit 57c connections.Herein, resistance 57b3 is the charge discharge for making capacitor 57b2 when capacitor 57b2 is disconnected
Component.
Also, in the output end of power circuit 61, it is also connected with the 1st switch unit 10, the 2nd switch unit 11 and constant pressure electricity
Road 33.
In addition, the gate electrode side in FET 53a is arranged in the 4th Zener diode 53b, resistance 55 is arranged in the defeated of rectification circuit 21
Go out negative side, but can also resistance 55 be set in the gate electrode side of FET 53a, is arranged the 4th in the output negative pole side of rectification circuit 21
Zener diode 53b.
In addition, " overvoltage detection circuit " refers to above-mentioned overvoltage detection circuit 57 in detail in the claims.
Action is illustrated below.
In the normal state, if supplying the alternating voltage of AC100V~400V or so from alternating current circuit 1, in current limliting electricity
The electric current Ia that exchange is flowed in resistance 20, DC voltage Vb is transformed to using rectification circuit 21.Pass through what is exported from rectification circuit 21
Electric current Ib, via resistance 53c to 55 streaming current Ic of the 4th Zener diode 53b and resistance.On the other hand, due to the 5th Zener
The Zener voltage of diode 54 is than the DC voltage Vb high of rectification circuit 21, therefore the 5th Zener diode 54 is not turned on, and electric current is not
It can be flowed to the 4th Zener diode 53b and resistance 55 via the 5th Zener diode 54.
At this point, the resistance value of resistance 53c, greatly to hundreds of k~a few M Ω, corresponding thereto, the resistance value of resistance 55 is small to tens
~hundreds of Ω, therefore the electric current Ic flowed in resistance 55 is substantially determined by resistance 53c, for example (,) it is small to tens μ A~hundreds of
μA.Therefore, it is possible to the voltage drop of basic negligible resistance 55.As a result, if resistance 55 and the 4th Zener diode 53b born
Voltage (grid voltage of FET 53a) be set as Vc, then become Vc ≈ (Zener voltage of the 4th Zener diode 53b).
In addition, the output voltage Vd of reduction voltage circuit 53 becomes Vd=Vc- (conducting voltage of FET 53a), but institute as above
It states, Vc ≈ (Zener voltage of the 4th Zener diode 53b), therefore becomes Vd ≈ (the Zener electricity of the 4th Zener diode 53b
Pressure)-(conducting voltage of FET 53a), it is the rated voltage of power circuit 61.
Here, if the conducting voltage of FET 53a is set as 3V or so, sets the Zener voltage of the 4th Zener diode 53b
For 24V or so, then the output voltage Vd of reduction voltage circuit 53 becomes Vd ≈ 24V-3V=21V or so.
In addition, if the Zener voltage of the 6th Zener diode 56 is set as 24V or so, the 6th Zener diode 56 is held
The output voltage Vd received is 21V or so, and no more than the Zener voltage of the 6th Zener diode 56.6th Zener diode as a result,
56 are not turned on, and electric current Id does not flow.
In addition, if the Zener voltage of the 7th Zener diode 57a i.e. the 2nd specified value is set as 23V or so, the 7th Zener
The output voltage Vd that diode 57a is born is 21V or so, therefore the 7th Zener diode 57a is also not turned on.
As a result, electric from the output end of power circuit 61 to overcurrent trip element 7, leakage tripping element 8 and constant pressure
The power supply of road 33 DC21V or so, constant voltage circuit 33 makes the output voltage of power circuit 61 be depressured and be supplied to detection circuit 5 defined
Constant voltage (such as DC5V).
Under such power supply state, in the case of electric leakage has occurred in alternating current circuit 1, in leakage meter 4
Signal is generated in output, has been more than defined a reference value to the output signal level of leakage meter 4 using detection circuit 5
Situation is differentiated, leakage tripping signal is exported to the 2nd switch unit 11.2nd switch unit 11 becomes due to the output
Conducting flows exciting current to leakage tripping element 8 from power circuit 61 via the 2nd switch unit 11, passes through tripping mechanism 12
It is acted, to which opening and closing contact 2 forms open circuit.
In addition, " the 1st specified value " refers to the Zener electricity of the 6th above-mentioned Zener diode 56 in detail in the claims
Pressure, in the same manner, " the 2nd specified value " refers to the Zener electricity of the 7th above-mentioned Zener diode 57a in detail in the claims
Pressure.
In the following, the case where to being superimposed instantaneous surge voltage in the alternating voltage in alternating current circuit, illustrates.
If being superimposed the surge voltage of several kV in alternating voltage, it is applied to the 5th Zener diode 54 and the 4th Zener two
The application voltage of the series circuit of pole pipe 53b is closed more than the Zener voltage of the 5th Zener diode 54 and the 4th Zener diode 53b
Evaluation, therefore the 5th Zener diode 54 also becomes being connected.
At this point, the electric current Ic flowed in resistance 55 becomes greatly tens mA compared with tens μ of μ A~hundreds of A when usual,
Voltage drop is generated in resistance 55, the voltage Vc that resistance 55 and the 4th Zener diode 53b are born rises.For example, if resistance
55 resistance value is 100 Ω or so, and electric current Ic is 40mA or so, then the voltage drop of resistance 55 becomes 4V or so, 55 He of resistance
The voltage Vc that 4th Zener diode 53b is born becomes Vc=24V+4V=28V or so.The output voltage Vd of reduction voltage circuit 53
Will to it is usual when voltage 21V or so add falling quantity of voltages, that is, 4V or so of resistance 55, and rise to 25V or so.However,
Since the voltage of the 25V or so is more than the Zener voltage (24V or so) of the 6th Zener diode 56, the 6th Zener diode 56
Conducting, the output voltage Vd of reduction voltage circuit 53 are suppressed to the Zener voltage (24V or so) of the 6th Zener diode 56.
Although in addition, at this point, Zener voltage 23V more than the 7th Zener diode 57a, due to being connected in series with resistance
57b1, resistance 57b1 share voltage and limit electric current, therefore the voltage of power circuit 61 is maintained the 6th Zener diode 56
Zener voltage (24V).As a result, the 7th Zener diode 57a is held on, opened via resistance 57b1 in integrating circuit 57b
The charging of beginning capacitor 57b2.However, in the case where generating instantaneous surge voltage, the alternating voltage in alternating current circuit 1
The time of middle superposition surge voltage is very short (for example, 1~2msec or so).Therefore, the voltage of capacitor 57b2 not fully on
It rises, that is, since the time that the output voltage of power circuit 61 is more than the 2nd assigned voltage is shorter than the stipulated time, comparison circuit
The output access failure of 57c, leakage circuit breakers 101 is without tripping action.
As described above, leakage circuit breakers 101 is without tripping action, but the output voltage of power circuit 61 is suppressed to
The Zener voltage of 6 Zener diodes 56 protects detection circuit 5, the 1st switch unit 10, the 2nd switch unit 11 from surge voltage
It influences.
In the following, the case where to being superimposed continuous overvoltage in alternating current circuit, illustrates.
If being applied continuously in the overvoltage of several kV into alternating current circuit 1, due to be applied to the 5th Zener diode 54 with
The application voltage of the series circuit of 4th Zener diode 53b is more than the neat of the 5th Zener diode 54 and the 4th Zener diode 53b
Receive voltage aggregate value, therefore the 5th Zener diode 54 also becomes being connected.
At this point, the electric current Ic flowed in resistance 55 becomes greatly tens mA compared with tens μ of μ A~hundreds of A when usual,
Voltage drop is generated in resistance 55, the voltage Vc that resistance 55 and the 4th Zener diode 53b are born rises.For example, if resistance
55 resistance value is 100 Ω or so, and electric current Ic is 40mA or so, then the voltage drop of resistance 55 becomes 4V or so, 55 He of resistance
The voltage Vc that 4th Zener diode 53b is born becomes Vc=24V+4V=28V or so.The output voltage Vd of reduction voltage circuit 53
Will to it is usual when voltage 21V or so add falling quantity of voltages, that is, 4V or so of resistance 55, and rise to 25V or so.However,
Since the voltage of the 25V or so is more than the Zener voltage (24V or so) of the 6th Zener diode 56, the 6th Zener diode 56
Conducting, the output voltage Vd of reduction voltage circuit 53 are suppressed to the Zener voltage (24V or so) of the 6th Zener diode 56.
At this point, due to the Zener voltage 23V more than the 7th Zener diode 57a, the 7th Zener diode 57a is also led
It is logical, start the charging of capacitor 57b2 via resistance 57b1 in integrating circuit 57b.In the case of continuous overvoltage,
The voltage of capacitor 57b2 fully rises, the output voltage of power circuit 61 be more than the time of the 2nd specified value more than regulation when
Between, the output of comparison circuit 57c is connected, output to the 1st switch unit 10.Using the output of comparison circuit 57c, the 1st switch is single
Member 10 is also connected, and flows exciting current to overcurrent trip element 7 from power circuit 61 via the 1st switch unit 10, trip machine
Structure 12 is acted, and opening and closing contact 2 forms open circuit as a result, that is, carries out overcurrent trip.Also, since the formation of opening and closing contact 2 is opened
Road, therefore stop to the power supply of power circuit 61.
According to the present embodiment, have：Power circuit 61, by reduction voltage circuit 53, the 5th Zener diode 54 and resistance
55 are constituted, wherein the reduction voltage circuit 53 makes the electric power supplied from alternating current circuit 1 decompression be the electric power of constant pressure, two pole of the 5th Zener
Pipe 54 is detected overvoltage according to the output voltage of rectification circuit 21, which detects in the 5th Zener diode 54
The output voltage of reduction voltage circuit 53 is set to boost when going out overvoltage；6th Zener diode 56 is arranged in the defeated of the power circuit 61
Go out side, absorbs surge current when the output voltage of power circuit 61 has reached 1 specified value；And overvoltage detection circuit
57, the outlet side in power circuit 61 is set, when the output voltage of power circuit 61 has been more than 2 specified value, via the 1st
Switch unit 10 drives over current trip 7, wherein the 2nd specified value is higher than the rated voltage of power circuit 61
And it is lower than the 1st specified value, due to having above-mentioned component, even if being applied continuously in alternating current circuit 1 in pressure test etc.
It, also can be by making leakage circuit breakers 101 carry out overcurrent trip, to protect leakage circuit breakers 101 in the case of overvoltage.
In addition, in pressure test, jumped by the overcurrent for making leakage circuit breakers 101 carry out 9 attonity of electricity leakage indicator
Lock becomes the usually unimaginable state in pressure test, and electric leakage jump is different from so as to trip caused by overvoltage
Lock.
Claims (2)
1. a kind of leakage circuit breakers, which is characterized in that have：
Opening and closing contact makes circuit be opened and closed；Over-current detector is detected the overcurrent of the circuit；Leakage current is examined
Device is surveyed, the leakage current of the circuit is detected；Overcurrent trip element is detected based on the over-current detector
Signal, so that the opening and closing contact is disconnected；And leakage tripping element, the letter detected based on the leakage meter
Number, so that the opening and closing contact is disconnected,
There is the leakage circuit breakers overvoltage detection circuit, the overvoltage detection circuit to be carried out to the overvoltage from the circuit
Detection, and the overcurrent trip element is driven,
In addition, the leakage circuit breakers also has：
The power circuit of insulated type is connect with the circuit, has switch transformer；And
Detection circuit is driven by the primary side output of the switch transformer, based on the over-current detector and
The detection signal of the leakage meter is detected overcurrent and electric leakage,
The overvoltage detection circuit has：The primary side in the switch transformer is arranged, to described in voltage detecting circuit
The voltage of circuit is detected；Trigger circuit when detecting overvoltage in the voltage detecting circuit, keeps the primary side defeated
The voltage gone out rises；And monitoring circuit, monitor the voltage of the primary side output, it is super in the voltage of primary side output
When having crossed specified value, the overcurrent trip element is driven.
2. leakage circuit breakers according to claim 1, which is characterized in that
With electricity leakage indicator, the electricity leakage indicator is and described when the leakage tripping element disconnects the opening and closing contact
Leakage tripping element links, and shows leakage tripping.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-165931 | 2015-08-25 | ||
| JP2015165931 | 2015-08-25 | ||
| JP2015217679A JP6610173B2 (en) | 2015-08-25 | 2015-11-05 | Earth leakage breaker |
| JP2015-217679 | 2015-11-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106486961A CN106486961A (en) | 2017-03-08 |
| CN106486961B true CN106486961B (en) | 2018-10-16 |
Family
ID=58210435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610085663.7A Active CN106486961B (en) | 2015-08-25 | 2016-02-15 | Leakage circuit breakers |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6610173B2 (en) |
| KR (1) | KR20170024519A (en) |
| CN (1) | CN106486961B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019193743A1 (en) * | 2018-04-06 | 2019-10-10 | 三菱電機株式会社 | Electric leak detection device and electric leak circuit breaker |
| CN109032042B (en) * | 2018-09-11 | 2023-09-22 | 中国地质大学（武汉） | Discharge circuit with constant voltage and constant current |
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| CN1444788A (en) * | 2000-08-22 | 2003-09-24 | 三菱电机株式会社 | Ground fault interrupter |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106486961A (en) | 2017-03-08 |
| KR20170024519A (en) | 2017-03-07 |
| JP6610173B2 (en) | 2019-11-27 |
| JP2017045706A (en) | 2017-03-02 |
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