CN106486961A - Rccb - Google Patents
Rccb Download PDFInfo
- Publication number
- CN106486961A CN106486961A CN201610085663.7A CN201610085663A CN106486961A CN 106486961 A CN106486961 A CN 106486961A CN 201610085663 A CN201610085663 A CN 201610085663A CN 106486961 A CN106486961 A CN 106486961A
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- circuit
- voltage
- leakage
- resistance
- zener diode
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Classifications
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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
Abstract
The present invention relates to a kind of RCCB, though its in the case that pressure test etc. is applied continuously in overvoltage to alternating current circuit it is also possible to make RCCB carry out open circuit, prevent the fault of built-in power circuit.This RCCB has：Opening and closing contact (2), it makes alternating current circuit (1) be opened and closed；Over-current detector (3), it detects to the overcurrent of alternating current circuit (1)；Leakage meter (4), it detects to the leakage current of alternating current circuit (1)；Overcurrent trip element (7), its signal detecting Ji Yu over-current detector (3) makes opening and closing contact (2) disconnect；And leakage tripping element (8), its signal detecting Ji Yu leakage meter (4) makes opening and closing contact (2) disconnect, this RCCB also has overvoltage detection circuit (34), this overvoltage detection circuit detects to the overvoltage from alternating current circuit (1), and drives overcurrent trip element (7).
Description
Technical field
The present invention relates to the leakage current in circuit goes above or is equal to this circuit during setting
The RCCB disconnecting, is the leakage, breaking of electronic type particularly to overcurrent trip mode
Device.
Background technology
It is built in the power circuit in RCCB, in the exchange that will supply from alternating current circuit
After voltage (such as AC100V) is transformed to DC voltage using rectification circuit, after rectification
DC voltage be transformed to more low-voltage using reduction voltage circuit DC voltage (for example
DC24V), as electric-leakage detection circuit, the driving power supply of tripgear and supplied.
In such power circuit, due to thunderbolt, arcing ground etc. in alternating current circuit
In the case of inducing surge voltage, need to protect electric-leakage detection circuit, tripgear from this
Surge voltage affects.
As this protection location, there is a kind of power circuit (for example, referring to patent documentation 1),
It is provided with：Voltage detecting circuit, it detects surge voltage according to the output voltage of rectification circuit；
Booster circuit, it, when this voltage detecting circuit detects surge voltage, makes the defeated of reduction voltage circuit
Go out boost in voltage；And current sink circuit, it is arranged on the outlet side of reduction voltage circuit, in fall
When the output voltage of volt circuit reaches the value of regulation, absorb surge current.
Patent documentation 1：Japanese Unexamined Patent Publication 2009-95125 publication
In the power circuit of existing RCCB, inducing the situation of surge voltage
Under, boosted using the output voltage that booster circuit makes reduction voltage circuit, in the output electricity of reduction voltage circuit
Pressure makes electric current pass through from the current sink circuit absorbing surge current when having reached the value of regulation, from
And it is clamped at constant voltage, prevent the part constituting electric-leakage detection circuit due to overvoltage
Break down.The pulse width generally maximum envisioning surge voltage is also just for a few m seconds.Certainly,
The limit can be had by the energy of reduction voltage circuit, current sink circuit, therefore continuous
Be applied with overvoltage in the case of can overstep the extreme limit, cause reduction voltage circuit, current sink circuit
Fault.
Following situations can be considered, i.e. as the above-mentioned probability being applied continuously in overvoltage,
In panel carrying RCCB etc., in order to confirm to comprise the friendship of RCCB
It is in insulation between the alternate and alternating current circuit of current circuit and the earth (earth), implement resistance to
Pressure test (for example, 2000V 1 minute).
Generally, as RCCB, the feelings of the product being connected with electronic circuit in circuit
Under condition, forbid carrying out alternate pressure test, only between alternating current circuit and the earth (earth)
Implement pressure test.Therefore, not to alternate applying overvoltage.However, as shown in fig. 6, such as
Fruit RCCB is connected with load circuit, then via the equipment connecting between the earth (for example,
Surge absoption electricity container, noise filter etc.), the static capacity over the ground of electric wire and unexpectedly
It is applied continuously in overvoltage alternate, as a result, occasionally resulting in the power circuit of RCCB
Produce fault.
Content of the invention
The present invention proposes to solve above-mentioned such problem, its object is to
To a kind of RCCB, this RCCB has for the protection applying continuous overvoltage
Function.
The present invention has：Opening and closing contact, it makes circuit be opened and closed；Over-current detector, it is right
The overcurrent of circuit is detected；Leakage meter, it detects to the leakage current of circuit；
Overcurrent trip element, it makes opening and closing contact break based on the signal detecting of over-current detector
Open；And leakage tripping element, it makes opening and closing based on the signal detecting of leakage meter
Contact disconnects, and the present invention has overvoltage detection circuit, and this overvoltage detection circuit is to from electricity
The overvoltage on road is detected, and drives overcurrent trip element.
The effect of invention
The present invention has and when detecting the overvoltage of circuit, overcurrent trip element is driven
Dynamic overvoltage detection circuit, therefore when detecting continuous overvoltage, RCCB is carried out
Overcurrent trip, protects RCCB from over-voltage protection, and can be by pressure test
When leakage tripping is different from by the tripping operation that overvoltage causes.
Brief description
Fig. 1 is the entirety of the structure representing the RCCB in embodiments of the present invention 1
Structure chart.
Fig. 2 is the circuit diagram of the details representing the power circuit in Fig. 1.
Fig. 3 is the circuit diagram of the details representing the triggers circuit in Fig. 2.
Fig. 4 is the power circuit representing the RCCB in embodiments of the present invention 2
Circuit diagram.
Fig. 5 is the circuit diagram of an example of the details representing the integrating circuit shown in Fig. 4.
Fig. 6 is in the case of by being assembled in existing RCCB in panel
Circuit diagram, the explanatory diagram that the problem of the present invention is illustrated.
The explanation of label
2 opening and closing contacts, 3 over-current detectors, 4 leakage meters, 5 testing circuits,
6 power circuits, 7 overcurrent trip elements, 8 leakage tripping elements, 9 electricity leakage indicators,
10 the 1st switch elements, 11 the 2nd switch elements, 12 tripping mechanisms, 22d the 2nd Zener
Diode, 23m monitoring circuit, 23d triggers circuit, 100 RCCBs.
Specific embodiment
Embodiment 1.
Fig. 1 is that the electric leakage representing and make use of the power circuit in embodiments of the present invention 1 is broken
The circuit diagram of the structure of road device, Fig. 2 is the circuit diagram of the details representing the power circuit in Fig. 1,
Fig. 3 is the circuit diagram of the details representing the triggers circuit in Fig. 2.
In FIG, RCCB 100 has：Opening and closing contact 2, it makes alternating current circuit 1
Opening and closing；Over-current detector 3, it detects to the overcurrent of alternating current circuit 1；Leakage current
Detector 4, it is inserted in alternating current circuit 1, and leakage current is detected；Testing circuit 5,
Its detection signal based on over-current detector 3 and leakage meter 4 to overcurrent or
Electric leakage is detected；Power circuit 6, it is connected with alternating current circuit 1, using for driving inspection
The switch transformer of slowdown monitoring circuit 5；Overcurrent trip element 7, it flows through alternating current in overcurrent
During road 1, the output signal according to testing circuit 5 is pressed via the 1st switch element 10,
Opening and closing contact 2 is disconnected；Leakage tripping element 8, it detects ratio in leakage meter 4
During the big leakage current of setting, the output signal according to testing circuit 5 is via the 2nd switch element
11 are pressed, and opening and closing contact 2 is disconnected；And electricity leakage indicator 9, it is in leakage tripping unit
When part 8 has carried out action, show to user and there occurs electric leakage.
If RCCB 100 is closed a floodgate, opening and closing contact 2 closes, then alternating current circuit 1
Voltage be applied in power circuit 6 set by the load-side of RCCB 100, power supply
Circuit 6 is to testing circuit 5 supply line voltage.
Here, the electric current of alternating current circuit 1 via over-current detector 3 by testing circuit 5
Monitored.In the case of detecting abnormal electric current, testing circuit 5 connects the 1st switch
Unit 10 and drive overcurrent trip element 7, so that RCCB 100 is tripped.
In the case of flowing through leakage current, leakage meter 4 is defeated by detection signal output
Enter to testing circuit 5.Situation in the leakage current being judged as flowing through more than or equal to setting
Under, testing circuit 5 is connected the 2nd switch element 11 and is driven leakage tripping element 8, makes leakage
Electrical circuit breakers 100 trip.Now, the electricity leakage indicator 9 with leakage tripping element 8 linkage
It is also carried out action, show to user and there occurs electric leakage accident.
In fig. 2 the structure of power circuit 6 is illustrated.
Power circuit 6 has：Current-limiting resistance 20, it is connected with alternating current circuit 1, to electric current
Limited；Rectification circuit 21 (rectification circuit for example, realized using diode bridge),
It is attached via this current-limiting resistance 20, and will exchange all wave rectification is direct current；Reduction voltage circuit
22, it is connected with the outlet side of rectification circuit 21, include field-effect transistor 22a (under
Face is designated as FET)；And Switching Power Supply 23, it includes the back segment with this reduction voltage circuit 22
The switch transformer 23a being connected.
Reduction voltage circuit 22 has：FET 22a, it is by the output of drain electrode and rectification circuit 21 just
Pole side connects；1st Zener diode 22b, negative electrode is connected by it with the grid of FET 22a；
1st resistance 22c, it is connected between the drain electrode of FET 22a and grid；2nd Zener two pole
Pipe 22d, anode is connected by it with the grid of FET 22a, and the 2nd Zener diode 22d
It is connected in parallel with the 1st resistance 22c；2nd resistance 22e, it is connected to the 1st Zener diode
Between the output negative pole side of the anode of 22b and rectification circuit 21；And the 3rd Zener diode
22f, its negative electrode is connected with the source electrode of FET 22a, and its anode is negative with the output of rectification circuit 21
Pole side connects.
Here, the resistance value of the 1st resistance 22c is set to hundreds of k～a few M Ω, by
The resistance value of 2 resistance 22e is set to tens～hundreds of Ω, and makes the 2nd Zener diode 22d
Zener voltage 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 triggers circuit 23d etc. is constituted.
Switch transformer 23a has：The leakage of the 1st winding 23a1, its one end and FET 22a
Pole connects, and the other end is connected with the drain electrode of switch element 23b；2nd winding 23a2, one
End is connected with the anode of diode 23e, and the other end is connected with the output negative pole side of rectification circuit 21
Connect；And the 3rd winding 23a3, its one end is connected with the anode of diode 23f, the other end
Primary side grounding connection with Switching Power Supply 23.
Switch driver 23c has：First control terminal 23c1, its with diode 23e with
And the negative electrode of diode 23g connects；Second control terminal 23c2, it is with rectification circuit 21
Output negative pole side connects；Lead-out terminal 23c3, it is connected with the grid of FET 22a；And
Monitor terminal 23c4, it is connected with triggers circuit 23d.
In addition, being connected with Zener two pole to the first control terminal 23c1 of switch driver 23c
The negative electrode of pipe 23h, the anode of this Zener diode 23h and the output negative pole of rectification circuit 21
Side is connected, and the anode of diode 23g is connected with the source electrode of FET 22a.
As shown in figure 3, triggers circuit 23d has：Diode 23d1, its anode and the 2nd
The junction point of resistance 22e and the 1st Zener diode 22b is connected；Resistance 23d2, one
End is connected with diode 23d1 negative electrode；Transistor 23d3, its base stage is with resistance 23d2's
The other end connects, and its emitter stage is connected with the output negative pole side of rectification circuit 21；Capacitor
23d4, it is connected between diode 23d1 negative electrode and the output negative pole side of rectification circuit 21；
Resistance 23d5, its one end is connected with the colelctor electrode of transistor 23d3, the other end and switch drive
The supervision terminal 23c4 of device 23c connects；And resistance 23d6, it is connected to transistor 23d3
Base stage and emitter stage between.
Following effects are had by the integrating circuit that resistance 23d2 and capacitor 23d4 are constituted, i.e.
After voltage detecting circuit starts the time that have passed through regulation action, make transistor 23d3
Conducting.
In addition, being additionally provided with：Diode 23i, one end of its anode and the 2nd winding 23a2
Connect；Resistance 23j, its one end is connected with the negative electrode of diode 23i, the other end with monitor end
Sub- 23c4 connects；And resistance 23k, it is connected to the other end of resistance 23j and rectified current
Between the output negative pole side on road 21.
If the transistor 23d3 conducting of triggers circuit 23d, to switch driver 23c's
Monitor that the applied voltage of terminal 23c4 can change.Specifically, in triggers circuit 23d
Transistor 23d3 conducting when because be connected to monitoring terminal 23c4 and rectification circuit 21
Resistance 23k between output negative pole side is connected in parallel with the resistance 23d5 of triggers circuit 23d,
So circuit constant is changed so that reducing to the applied voltage of 23c4.
Negative electrode to the diode 23f of the primary side of switch transformer 23a is connected with overcurrent
Trip component 7, leakage tripping element 8, are configured to, when there occurs overcurrent via the 1st
Switch element 10 to overcurrent trip element 7 supply electric power, when there occurs electric leakage via
2 switch elements 11 are to leakage tripping element 8 supply electric power, so that RCCB 100
Carry out trip operation.In addition, constant voltage circuit 33 and monitoring circuit 23m also with diode 23f
Negative electrode connect, wherein, constant voltage circuit 33 generates suitable voltage so that detection of excessive current,
The testing circuit 5 of the signal of electric leakage carries out action, and monitoring circuit 23m is to switch transformer 23a
The voltage of primary side monitored.
Additionally, described in detail in the claims " voltage detecting circuit " refers to above-mentioned the 2nd
Zener diode 22d, " overvoltage detection circuit " refer to the 2nd above-mentioned Zener diode 22d,
Triggers circuit 23d and monitoring circuit 23m.
Below action is illustrated.
In the normal state, if from alternating current circuit 1 supply AC100V～400V about friendship
Stream voltage, then the electric current Ia of exchange of flowing in current-limiting resistance 20, in rectification circuit 21
It is transformed to DC voltage Vb.By the electric current Ib exporting from rectification circuit 21, via the 1st
Resistance 22c is to the 1st Zener diode 22b (for example, Zener voltage 20V) and the 2nd electricity
Resistance 22e streaming current Ic.On the other hand, due to the Zener voltage of the 2nd Zener diode 22d
(for example, 800V) is higher than the DC voltage Vb of rectification circuit 21 is set to, and the 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 diode 22b and the 2nd resistance 22e flowing.
Now, the resistance value of the 1st resistance 22c for example arrives greatly hundreds of k～a few M Ω, with it
Relatively, the resistance value of the 2nd resistance 22e for example little to tens～hundreds of Ω, therefore the 2nd
In resistance 22e, the electric current Ic of flowing is determined by the 1st resistance 22c, e.g. tens μ A～several
The small electric current of hundred μ A.Therefore, it is possible to substantially ignore the voltage drop of the 2nd resistance 22e.
Thus, if by the concatermer being applied to the 1st Zener diode 22b and the 2nd resistance 22e
Voltage, that is, the grid voltage of FET 22a be set to Vc, then be changed into Vc ≈ (the 1st Zener two pole
The Zener voltage of pipe 22b).
In addition, the output voltage Vd of FET 22a is the Vd=Vc- (electric conduction of FET 22a
Pressure), but as described above, because Vc ≈ (Zener voltage of the 1st Zener diode 22b),
So Vd ≈ (Zener voltage of the 1st Zener diode 22b)-(conducting of FET 22a
Voltage), it becomes the supply voltage of switch driver 23c.
The output voltage Vd of FET 22a be fed with AC100V～400V about alternating current
Under the situation of pressure, set in the way of the Zener voltage less than the 3rd Zener diode 22f
Fixed, thus the 3rd Zener diode 22f is not turned on, not streaming current Id.
In addition, though applying the 1st Zener diode 22b and the 2nd electricity to triggers circuit 23d
The voltage of the junction point of resistance 22e, but because the both end voltage of resistance 22e is small voltage,
Thus without the forward voltage (0.7V about) exceeding connected diode 23d1, do not flow
Streaming current, thus transistor 23d3 is not turned on.
Thus, AC100V～400V about alternating voltage be transformed to be suitable for driving open
Close the DC voltage of driver 23c, make switch driver 23c carry out action.Switch driver
The lead-out terminal 23c3 driving switch element 23b of 23c, to the 1st of switch transformer 23a around
The discharge and recharge of group 23a1 is controlled.Carry out action with switch driver 23c, switch becomes
The output voltage of the 2nd winding 23a2 of depressor 23a and the 3rd winding 23a3 little by little rises,
But the output voltage due to the 2nd winding 23a2 is connected with supervision terminal 23c4, if therefore
Confirm the output having exceeded set voltage, then switch driver 23c stops to switch element
The output of 23b, thus reduces the output voltage of the 2nd winding 23a2 and the 3rd winding 23a3.
With the minimizing of output voltage, it is applied to the supervision terminal 23c4 of switch driver 23c
On voltage get lower than set voltage, thus starting again at defeated to switch element 23b
Go out, so that the output voltage of the 2nd winding 23a2 and the 3rd winding 23a3 is increased.
Being repeated by said process, the 2nd winding 23a2 and the 3rd winding 23a3
Output voltage can keep constant value (for example, DC 20V).Additionally, being applied to supervision
The voltage of terminal 23c4 can be set in detail by using electric resistance partial pressure.
The output voltage of the 3rd winding 23a3 is as overcurrent trip element 7, leakage tripping unit
The driving power supply of part 8 and be fully utilized.In addition, supplying to excessively electric via constant voltage circuit 33
The power supply (for example, DC 5V) of the testing circuit 5 that stream, electric leakage are detected.In this shape
Under state, rule are exceeded in the output signal from over-current detector 3, leakage meter 4
In the case of fixed value, testing circuit 5 makes the 1st switch element 10, the 2nd switch element 11
Connect, exciting current flows to overcurrent trip element 7, leakage tripping element 8, operation leakage
The tripping mechanism 12 of electrical circuit breakers 100 and make opening and closing contact 12 separate.
Below, the situation being superimposed continuous overvoltage in alternating current circuit 1 is illustrated.
If be applied continuously in the overvoltage of several kV to alternating current circuit 1, due to being applied to
2 Zener diode 22d are exceeded with the applied voltage of the series circuit of the 1st Zener diode 22b
The aggregate value of the Zener voltage of the 2nd Zener diode 22d and the 1st Zener diode 22b, inspection
Measure overvoltage, the therefore the 2nd Zener diode 22d is changed into turning on.
Now, in the 2nd resistance 22e the electric current Ic of flowing with usual when tens μ A～several
Hundred μ A compare change greatly tens mA, produce voltage drop in the 2nd resistance 22e, are applied to the
The voltage Vc of 2 resistance 22e and the 1st Zener diode 22b rises.For example, if the 2nd electricity
The resistance value of resistance 22e is 100 Ω, and electric current Ic is 40mA, then the 2nd resistance
The voltage drop of 22e is changed into 4V, is applied to the 2nd resistance 22e and the 1st Zener diode 22b
Voltage Vc uprise 4V compared with common state (such as 20V).Thus, FET 22a
Output voltage similarly uprise 4V, due to neat more than the 3rd Zener diode 22f
Receive voltage (for example, 23V), the therefore the 3rd Zener diode 22f conducting, FET 22a's is defeated
Go out the Zener voltage that voltage Vd is suppressed to the 3rd Zener diode 22f.
Now, due to applying the two of the 2nd resistance 22e as described above to triggers circuit 23d
Terminal voltage is 4V, therefore exceedes the forward voltage of diode 23d1, electric current flowing,
The capacitor 23d4 therefore constituting the integrating circuit of triggers circuit 23d is charged.Due to
It is superimposed with continuous overvoltage, the voltage of therefore capacitor 23d4 is charged to setting (example
As 3V), transistor 23d3 turns on.
Due to being turned on by transistor 23d3, resistance 23d5 becomes in parallel with resistance 23k and connects
Connect, therefore resistance 23j is with respect to the intrinsic standoff ratio of the simultaneously disjunctor of resistance 23d5 and resistance 23k
Change, monitor the applied voltage of terminal 23c4 to the junction point of resistance 23j and resistance 23k
Reduce.
Therefore, even if the driving of switch element 23b should be stopped in the normal state
The output voltage of switch transformer 23a only, switch driver 23c also can persistent switch element
The driving of 23b, output voltage rising compared with common voltage of the 3rd winding 23a3.
As described above described, if being superimposed continuous overvoltage, switch transformer 23a
The output voltage of primary side can export higher voltage compared with usual state.Thus, monitor
Circuit 23m detects the rising of the output voltage of the primary side of switch transformer 23a, makes the 1st
Switch element 10 turns on, and therefore via overcurrent trip element 7, tripping mechanism 12 is driven
Dynamic, opening and closing contact 2 is that RCCB 100 carries out overcurrent trip.It is additionally, since opening and closing
Contact 2 forms open circuit, therefore stops the power supply to power circuit 6.
So that load current is energized to panel, only carry out profit
Applied with the voltage of compression tester.Therefore, if there is insulation fault etc., then testing circuit
5 detect electric leakage, and RCCB 100 carries out leakage tripping.Now, with leakage tripping unit
The electricity leakage indicator 9 of part 8 linkage is also carried out action, shows to user and there occurs electric leakage accident.
If here detects overvoltage, leakage tripping element 8 is made to carry out action and make electric leakage
Chopper 100 carries out leakage tripping, then because electricity leakage indicator 9 is also carried out action, therefore make
User can not differentiate due to electric leakage cause tripping operation, or the tripping operation being caused by overvoltage.
On the other hand, compression tester exists to the electric current of flowing and limits it is impossible to supply makes leakage
Electrical circuit breakers 100 carry out the electric current of overcurrent trip degree.Therefore, can not in pressure test
Chopper is made to carry out overcurrent trip.That is, in pressure test by making RCCB 100
Carry out the tripping operation caused by the no overcurrent of the action of electricity leakage indicator 9, thus becoming usual
Unimaginable state.Thereby, it is possible to promote to remind user to notice that test method has mistake.
Below, the situation being superimposed instantaneous surge voltage in alternating current circuit 1 is said
Bright.
If being superimposed the surge voltage of several kV in alternating current circuit 1, it is applied to the 2nd Zener
The applied voltage of the series circuit of diode 22d and the 1st Zener diode 22b, more than the 2nd
The aggregate value of the Zener voltage of Zener diode 22d and the 1st Zener diode 22b, due to inspection
Measure overvoltage, the therefore the 2nd Zener diode 22d is also changed into turning on.
Now, in the 2nd resistance 22e flowing electric current Ic with usual when tens μ A～
Hundreds of μ A compares change greatly tens mA, generation voltage drop in the 2nd resistance 22e, and the 2nd
The voltage Vc that resistance 22e and the 1st Zener diode 22b is born rises.If such as
The resistance value of 2 resistance 22e is 100 Ω, and electric current Ic is 40mA, then the 2nd
The voltage drop of resistance 22e is changed into 4V, the 2nd resistance 22e and the 1st Zener diode 22b
The voltage Vc being born uprises 4V compared with common state.Due to FET 22a's
Output voltage similarly uprises 4V, the Zener electricity more than the 3rd Zener diode 22f
Pressure, the therefore the 3rd Zener diode 22f conducting, the output voltage Vd of FET 22a is pressed down
It is made as the Zener voltage of the 3rd Zener diode 22f.
Now, because the both end voltage applying the 2nd resistance 22e to triggers circuit 23d is 4V
Left and right, therefore exceedes the forward voltage of diode 23d1, electric current flowing, thus constituting triggering
The capacitor 23d4 of the integrating circuit of circuit 23d is charged.If in capacitor 23d4
Voltage fully rise, transistor 23d3 turn on, then to the supervision of switch driver 23c
In the case that the applied voltage of terminal 23c4 there occurs change, then leaked according to the reasons why aftermentioned
Electrical circuit breakers 100 carry out trip operation, but due to being superimposed the time very short (example of surge voltage
As 1～2msec), therefore capacitor 23d4 is not sufficiently carried out charging, therefore crystal
Pipe 23d3 is not turned on.
As mentioned above although RCCB 100 does not carry out tripping action, but power circuit 6
Output voltage can be suppressed to the Zener voltage of the 3rd Zener diode 22f, protection detection electricity
Road 5 grade affects from surge voltage.
According to present embodiment, because having the warp when detecting the overvoltage of alternating current circuit 1
Monitoring circuit 23m tripping mechanism 12 being driven by overcurrent trip element 7, so
In continuous applying overvoltage, RCCB 100 carries out overcurrent trip, can protect electric leakage
Chopper 100 is from over-voltage protection.
In addition, in pressure test, carrying out electricity leakage indicator 9 by making RCCB 100
The overcurrent trip of attonity, becomes usual state unimaginable in pressure test, so as to
Enough the tripping operation being caused by overvoltage is different from leakage tripping.
Additionally, in the present embodiment, circuit is illustrated for the situation of alternating current circuit,
But if using and also the direct current using Hall element can be entered as over-current detector 3
Row detection current detecting, use as leakage meter 4 such as fluxgate sensor this
The sensor that the leakage current of direct current can be detected of sample, then obviously can be applied to direct current
Circuit.
Embodiment 2.
Fig. 4 is the circuit representing the power circuit of RCCB 101 in embodiment 2
Figure, Fig. 5 is the circuit diagram of an example of the details representing the integrating circuit shown in Fig. 4.
In embodiment 1, it has been shown with the power supply of the insulated type of switch transformer 23a
The example of circuit 6, but in the present embodiment, replace the power circuit 6 of insulated type and use
The power circuit 61 of nonisulated type.Other structures are because, institute identical with embodiment 1
To omit the description.
The alternating voltage inputting from alternating current circuit 1 is transformed to the direct current specifying by power circuit 61
Voltage and supply exciting current to overcurrent trip element 7 and leakage tripping element 8, and
It is transformed to the voltage of the regulation lower than the output voltage of power circuit 61 using constant voltage circuit 33,
Power to testing circuit 5.
Below, the details of power circuit 61 are illustrated.
This power circuit 61 is connected with alternating current circuit 1, in the current-limiting resistance 20 limiting electric current
Back segment be connected with the rectification circuit 21 being made up of diode bridge.In this rectification circuit 21
Outlet side is connected with the reduction voltage circuit 53 making its output voltage blood pressure lowering, this reduction voltage circuit 53 by under
State part to constitute：Field-effect transistor (below, being designated as FET) 53a, its drain electrode and rectification
The output cathode side of circuit 21 connects；4th Zener diode 53b, it is connected to FET 53a
Grid and the output negative pole side of rectification circuit 21 between；And resistance 53c (resistance value is
Hundreds of k～several M Ω about), it is connected to and supplies Zener electricity to the 4th Zener diode 53b
Between the drain electrode of FET 53a of stream and grid.
It is connected in parallel to the 5th Zener diode 54 (Zener with the resistance 53c of reduction voltage circuit 53
The output voltage of voltage ＞ rectification circuit 21) i.e. voltage detecting circuit, using the 5th Zener
Diode 54, detects to surge voltage according to the output voltage of rectification circuit 21.?
Between the output negative pole side of the grid of FET 53a and rectification circuit 21, it is connected with neat with the 4th
(resistance value is that tens～hundreds of Ω is left to the resistance 55 that the diode 53b that receives is attached in series
Right) i.e. booster circuit, when the 5th Zener diode 54 detects surge voltage, using this
Resistance 55 makes the output voltage of reduction voltage circuit 53 rise.Source electrode and rectified current in FET 53a
Between the output negative pole side on road 21, being connected with the 6th Zener diode 56 is current sink circuit,
The Zener voltage having reached the 6th Zener diode 56 in the output voltage of reduction voltage circuit 53 is
During 1 setting, absorb surge current using the 6th Zener diode 56.
In addition, the outfan in power circuit 61 is provided with overvoltage detection circuit 57, this mistake
Voltage detecting circuit 57 is connected in parallel with the 6th Zener diode 56, if from alternating current circuit 1
Persistently input overvoltage is until reach the stipulated time, then via the 1st switch element 10 to excessively electric
Stream trip component 7 is driven.
Overvoltage detection circuit 57 is made up of following part：7th Zener diode 57a (example
If, Zener voltage is 23V), the negative electrode company of its negative electrode and the 6th Zener diode 56
Connect, turn on when the output voltage of reduction voltage circuit 53 has exceeded 2 setting；Integrating circuit
The anode of 57b, its input and the 7th Zener diode 57a and the 6th Zener diode
56 anode connects；And comparison circuit 57c, it exceedes to the output of this integrating circuit 57b
Setting, the i.e. output voltage of power circuit 61 reach the 2nd assigned voltage and power circuit
The time that 61 output voltage reaches the 2nd assigned voltage has exceeded the stipulated time (such as 20msec)
Situation detected, drive the 1st switch element 10.
As shown in figure 5, integrating circuit 57b is made up of components described below：Resistance 57b1 (resistance
Be worth for 1k Ω～10k Ω about), its one end is connected with the anode of the 7th Zener diode 57a；
Capacitor 57b2 (capacity be 0.1 μ F～a few μ F about), its one end and this resistance 57b1
The other end connect, the other end of this capacitor 57b2 and the anode of the 6th Zener diode 56
Connect；And resistance 57b3 (resistance value be 1k Ω～10k Ω about), itself and this electric capacity
Device 57b2 is attached in parallel, and two ends are connected with comparison circuit 57c.Here,
Resistance 57b3 is the charge discharge for making capacitor 57b2 when capacitor 57b2 disconnects
Part.
And, the outfan in power circuit 61, be also connected with the 1st switch element 10,
2 switch elements 11 and constant voltage circuit 33.
Additionally, the 4th Zener diode 53b is arranged on the gate electrode side of FET 53a, resistance 55
It is arranged on the output negative pole side of rectification circuit 21 but it is also possible to the gate electrode side in FET 53a sets
Put resistance 55, the 4th Zener diode 53b is set in the output negative pole side of rectification circuit 21.
Additionally, " overvoltage detection circuit " described in detail in the claims refer to above-mentioned
Overvoltage detection circuit 57.
Below action is illustrated.
In the normal state, if from alternating current circuit 1 supply AC100V～400V about friendship
Stream voltage, then the electric current Ia of exchange of flowing in current-limiting resistance 20, become using rectification circuit 21
It is changed to DC voltage Vb.By the electric current Ib exporting from rectification circuit 21, via resistance 53c
To the 4th Zener diode 53b and resistance 55 streaming current Ic.On the other hand, due to the 5th
The Zener voltage of Zener diode 54 is higher than the DC voltage Vb of rectification circuit 21, and the therefore the 5th
Zener diode 54 is not turned on, and electric current will not be via the 5th Zener diode 54 to the 4th Zener
Diode 53b and resistance 55 flow.
Now, the resistance value of resistance 53c arrives greatly hundreds of k～a few M Ω, corresponding thereto, electricity
The resistance value of resistance 55 little to tens～hundreds of Ω, the electric current Ic of flowing therefore in resistance 55
Substantially determined by resistance 53c, for example small to tens μ A～hundreds of μ A.Accordingly, it is capable to
The voltage drop of enough basic negligible resistance 55.Thus, if by resistance 55 and the 4th Zener two pole
The voltage (grid voltage of FET 53a) that pipe 53b is born is set to Vc, then be changed into Vc ≈
(Zener voltage of the 4th Zener diode 53b).
In addition, the output voltage Vd of reduction voltage circuit 53 become Vd=Vc- (FET 53a's
Conducting voltage), but as described above, Vc ≈ (Zener voltage of the 4th Zener diode 53b),
Therefore it is changed into Vd ≈ (Zener voltage of the 4th Zener diode 53b)-(FET 53a's
Conducting voltage), it is the rated voltage of power circuit 61.
Here, if by the conducting voltage of FET 53a be set to 3V about, by the 4th Zener two
The Zener voltage of pole pipe 53b is set to 24V, then the output voltage Vd of reduction voltage circuit 53
It is changed into Vd ≈ 24V-3V=21V.
In addition, if the Zener voltage of the 6th Zener diode 56 is set to 24V, then
Output voltage Vd that 6th Zener diode 56 is born is 21V, and is less than the 6th
The Zener voltage of Zener diode 56.Thus, the 6th Zener diode 56 is not turned on, electric current
Id does not flow.
In addition, if the Zener voltage of the 7th Zener diode 57a is that the 2nd setting is set to
23V, then the 7th Zener diode 57a is born output voltage Vd are 21V,
Therefore the 7th Zener diode 57a is also not turned on.
As a result, from the outfan of power circuit 61 to overcurrent trip element 7, leakage tripping
Element 8 and constant voltage circuit 33 power supply DC21V, constant voltage circuit 33 makes power circuit 61
Output voltage blood pressure lowering and to testing circuit 5 supply regulation constant voltage (such as DC5V).
Under such power supply state, in the case of there occurs electric leakage in alternating current circuit 1,
Signal is produced, using testing circuit 5 to leakage meter 4 in the output of leakage meter 4
Output signal level exceeded the situation of reference value of regulation and differentiated, leakage tripping is believed
Number export to the 2nd switch element 11.2nd switch element 11 is changed into due to this output turning on,
From power circuit 61 via the 2nd switch element 11 to leakage tripping element 8 flowing exciting current,
Action is carried out by tripping mechanism 12, thus opening and closing contact 2 forms open circuit.
Additionally, described in detail in the claims " the 1st setting " refers to that above-mentioned the 6th is neat
Receive the Zener voltage of diode 56, in the same manner, described " the 2nd regulation in detail in the claims
Value " refers to the Zener voltage of the 7th above-mentioned Zener diode 57a.
Below, to the feelings being superimposed instantaneous surge voltage in the alternating voltage in alternating current circuit
Condition illustrates.
If being superimposed the surge voltage of several kV in alternating voltage, it is applied to the 5th Zener two pole
The applied voltage of the series circuit of pipe 54 and the 4th Zener diode 53b, more than the 5th Zener two
Pole pipe 54 and the Zener voltage aggregate value of the 4th Zener diode 53b, therefore the 5th Zener two pole
Pipe 54 is also changed into turning on.
Now, in resistance 55 flowing electric current Ic with usual when tens μ A～hundreds of μ A
Compare change greatly tens mA, resistance 55 produces voltage drop, resistance 55 and the 4th Zener two
The voltage Vc that pole pipe 53b is born rises.If the resistance value of such as resistance 55 is 100 Ω
Left and right, and electric current Ic is 40mA, then the voltage drop of resistance 55 is changed into 4V, electricity
The voltage Vc that resistance the 55 and the 4th Zener diode 53b is born is changed into Vc=24V+4V=28V
Left and right.The output voltage Vd of reduction voltage circuit 53 will to usual when voltage 21V about add
The falling quantity of voltages of resistance 55 is 4V, and rises to 25V.However, due to this
25V about voltage more than the 6th Zener diode 56 Zener voltage (24V about), because
This 6th Zener diode 56 turns on, and the output voltage Vd of reduction voltage circuit 53 is suppressed to the 6th
The Zener voltage (24V about) of Zener diode 56.
In addition, now although Zener voltage 23V more than the 7th Zener diode 57a, but
Due to being connected in series with resistance 57b1, resistance 57b1 shares voltage and limits electric current, therefore power supply
The voltage of circuit 61 is maintained the Zener voltage (24V) of the 6th Zener diode 56.Its knot
Really, the 7th Zener diode 57a is held on, via resistance 57b1 in integrating circuit 57b
And start the charging of capacitor 57b2.However, in the case of producing instantaneous surge voltage,
Time of being superimposed surge voltage in the alternating voltage in alternating current circuit 1 very short (for example, 1～
2msec about).Therefore, the voltage of capacitor 57b2 does not fully rise, i.e. due to electricity
The output voltage of source circuit 61 is shorter than the stipulated time more than the time of the 2nd assigned voltage, therefore than
Compared with the output access failure of circuit 57c, RCCB 101 does not carry out tripping action.
As described above, RCCB 101 does not carry out tripping action, but power circuit 61 is defeated
Go out the Zener voltage that voltage is suppressed to the 6th Zener diode 56, protection testing circuit 5, the
1 switch element 10, the 2nd switch element 11 affect from surge voltage.
Below, the situation being superimposed continuous overvoltage in alternating current circuit is illustrated.
If being applied continuously in the overvoltage of several kV in alternating current circuit 1, due to being applied to
The applied voltage of the series circuit of 5 Zener diodes 54 and the 4th Zener diode 53b is more than
5 Zener diodes 54 and the Zener voltage aggregate value of the 4th Zener diode 53b, the therefore the 5th
Zener diode 54 is also changed into turning on.
Now, in resistance 55 flowing electric current Ic with usual when tens μ A～hundreds of μ A
Compare change greatly tens mA, resistance 55 produces voltage drop, resistance 55 and the 4th Zener two
The voltage Vc that pole pipe 53b is born rises.For example, if the resistance value of resistance 55 is 100 Ω
Left and right, and electric current Ic is 40mA, then the voltage drop of resistance 55 is changed into 4V, electricity
The voltage Vc that resistance the 55 and the 4th Zener diode 53b is born is changed into Vc=24V+4V=28V
Left and right.The output voltage Vd of reduction voltage circuit 53 will to usual when voltage 21V about add
The falling quantity of voltages of resistance 55 is 4V, and rises to 25V.However, due to this
25V about voltage more than the 6th Zener diode 56 Zener voltage (24V about), because
This 6th Zener diode 56 turns on, and the output voltage Vd of reduction voltage circuit 53 is suppressed to the 6th
The Zener voltage (24V about) of Zener diode 56.
Now, due to Zener voltage 23V more than the 7th Zener diode 57a, the therefore the 7th
Zener diode 57a is also switched on, and starts electric capacity via resistance 57b1 in integrating circuit 57b
The charging of device 57b2.In the case of continuous overvoltage, the voltage of capacitor 57b2 is abundant
Ground rises, and the output voltage of power circuit 61 is more than the stipulated time more than the time of the 2nd setting,
The output of comparison circuit 57c is connected, and exports to the 1st switch element 10.Using comparison circuit 57c
Output, the 1st switch element 10 is also connected, from power circuit 61 via the 1st switch element
10 carry out action to overcurrent trip element 7 flowing exciting current, tripping mechanism 12, thus,
Opening and closing contact 2 forms open circuit, that is, carry out overcurrent trip.And, due to opening and closing contact 2 shape
Become open circuit, therefore stop to the power supply of power circuit 61.
According to present embodiment, possess：Power circuit 61, it is by reduction voltage circuit the 53, the 5th
Zener diode 54 and resistance 55 are constituted, and wherein, this reduction voltage circuit 53 makes from alternating current circuit
The electric power blood pressure lowering of 1 supply is the electric power of constant voltage, and the 5th Zener diode 54 is according to rectification circuit
21 output voltage detects to overvoltage, and this resistance 55 is in the 5th Zener diode 54
Detect that the output voltage making reduction voltage circuit 53 during overvoltage boosts；6th Zener diode 56,
It is arranged on the outlet side of this power circuit 61, reaches in the output voltage of power circuit 61
Surge current is absorbed during 1 setting；And overvoltage detection circuit 57, it is arranged on power supply
The outlet side of circuit 61, when the output voltage of power circuit 61 has exceeded 2 setting,
Via the 1st switch element 10, over current trip 7 is driven, wherein, the 2nd rule
Definite value is higher than the rated voltage of power circuit 61 and lower than the 1st setting, above-mentioned due to possessing
Part, therefore, even if be applied continuously in the feelings of overvoltage in pressure test etc. to alternating current circuit 1
Under condition, also can carry out overcurrent trip by making RCCB 101, thus protecting electric leakage disconnected
Road device 101.
In addition, in pressure test, carrying out electricity leakage indicator 9 by making RCCB 101
The overcurrent trip of attonity, becomes usual state unimaginable in pressure test, so as to
Enough the tripping operation being caused by overvoltage is different from leakage tripping.
Claims (3)
1. a kind of RCCB is it is characterised in that have：
Opening and closing contact, it makes circuit be opened and closed；Over-current detector, its mistake to described circuit
Electric current is detected；Leakage meter, it detects to the leakage current of described circuit；Cross
Current trip element, its signal being detected based on described over-current detector, make described opening and closing
Contact disconnects；And leakage tripping element, its letter being detected based on described leakage meter
Number, so that described opening and closing contact is disconnected,
This RCCB has overvoltage detection circuit, and this overvoltage detection circuit is to being derived from
The overvoltage of described circuit is detected, and drives described overcurrent trip element.
2. RCCB according to claim 1 is it is characterised in that have：
The power circuit of insulated type, it is connected with described circuit, has switch transformer；With
And
Testing circuit, it is driven by the primary side output of described switch transformer, is based on
Described over-current detector and the detection signal of described leakage meter, to overcurrent and
Electric leakage is detected,
Described overvoltage detection circuit has：Voltage detecting circuit, it is arranged on described switch
The primary side of transformator, detects to the voltage of described circuit；Triggers circuit, it is in this electricity
When detecting overvoltage in pressure testing circuit, the voltage of described primary side output is made to increase；And
Monitoring circuit, it monitors the voltage of described primary side output, in the voltage of described primary side output
When having exceeded setting, drive described overcurrent trip element.
3. RCCB according to claim 1 and 2 it is characterised in that
There is electricity leakage indicator, this electricity leakage indicator is opened described in described leakage tripping element
When closed contact disconnects, with the linkage of described leakage tripping element, show leakage tripping.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-165931 | 2015-08-25 | ||
| JP2015165931 | 2015-08-25 | ||
| JP2015-217679 | 2015-11-05 | ||
| JP2015217679A JP6610173B2 (en) | 2015-08-25 | 2015-11-05 | Earth leakage breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106486961A true CN106486961A (en) | 2017-03-08 |
| CN106486961B 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111989839A (en) * | 2018-04-06 | 2020-11-24 | 三菱电机株式会社 | Electric leakage detection device and electric leakage circuit breaker |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Also Published As
| Publication number | Publication date |
|---|---|
| JP6610173B2 (en) | 2019-11-27 |
| CN106486961B (en) | 2018-10-16 |
| KR20170024519A (en) | 2017-03-07 |
| JP2017045706A (en) | 2017-03-02 |
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