CN106970288A - Earth detector - Google Patents
Earth detector Download PDFInfo
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- CN106970288A CN106970288A CN201610825651.3A CN201610825651A CN106970288A CN 106970288 A CN106970288 A CN 106970288A CN 201610825651 A CN201610825651 A CN 201610825651A CN 106970288 A CN106970288 A CN 106970288A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The present invention provides earth detector, its reduce external part and can be by equipment miniaturization.A kind of imbalance of electric current by being flowed through in AC lines (2) and the earth detector (30) for detecting electric leakage, it possesses：ZCT (11), it detects the imbalance of the electric current flowed through in AC lines (2)；Relay (14), it is connected in series on AC lines (2)；Actuating of relay control element (49), when detecting imbalance by ZCT (11), the actuating of relay control element (49) makes relay (14) be acted and cut off AC lines (2), actuating of relay control element (49) is by that can carry out the semiconductor element of on/off control by control terminal (for example, MOSFET, IGBT) constitute, and it is built in the control unit (40) as integrated circuit.
Description
Technical field
The present invention relates to detection AC lines electric leakage, and when detecting electric leakage cut off AC lines earth detector.
Background technology
In the electronic device, in the case where AC lines leak electricity, it is possible to cause the misoperation of equipment, get an electric shock.Therefore,
Sometimes in the electronic device install detection AC lines electric leakage, and when detecting electric leakage cut off AC lines earth detector (example
Such as, with reference to patent document 1).
As shown in figure 11, conventional earth detector 10 possesses：ZCT(Zero-Phase-Current-
Transformer：Zero phase current transformer) 11, the outlet for the AC lines 2 that it is detected from AC power supplies 1 is connected and the current value in return road are different
Imbalance；Control circuit 12, its output by ZCT11 and detect and leak electricity and export cut-out output；IGCT 13, it receives
Cut-out from control circuit 12 is exported and connected；Relay 14, it cuts off AC by the cathode current of IGCT 13
Line 2；Rectification diode 15；Smoothing capacity device 16；Voltage limiting resistance 17；Current limitation resistor 18；LED19；Regenerate two poles
Pipe 20；Noise prevention capacitor 21；And reset with switch 22.
ZCT11 is made up of winding winding 11a circular magnetic 11b, and the insertion of AC lines 2 is in magnetic 11b circle.
When leaking electricity, when occurring difference on the current value in the outlet of AC lines 2 and return road, it is wound on magnetic 11b winding 11a and sends out
Motional electromotive force, winding 11a both end voltage exports and is input to ZCT input terminals T1, T2 of control circuit 12 as ZCT.
Control circuit 12 be possess ZCT input terminals T1, T2, lead-out terminal T3, Vcc terminal T4, GND terminal T5 it is integrated
Circuit (IC).12 pairs of circuit of control is input to ZCT input terminals T1, T2 ZCT outputs and detection of electrical leakage threshold voltage compares
Compared with when ZCT outputs exceed detection of electrical leakage threshold voltage, from lead-out terminal T3 output shutoff signals.
One in AC lines 2 is connected in series with rectification diode 15 and smoothing capacity device 16 between line and ground terminal.
The Vcc terminal T4 of control circuit 12 be connected to via voltage limiting resistance 17 rectification diode 15 and smoothing capacity device 16 it
Between tie point at, control circuit 12 GND terminal T5 be connected to ground terminal.Thus, the voltage of AC lines 2 passes through smoothing capacity
Device 16 and carried out smooth, and via voltage limiting resistance 17, the Vcc of control circuit 12 is input to as power source voltage Vcc
Terminal T4.
In addition, being connected in series between two terminals of smoothing capacity device 16 current limitation resistor 18, relay 14
Relay winding 14c, LED19, IGCT 13.The lead-out terminal T3 of control circuit 12 is connected to the grid of IGCT 13, when
When exporting shutoff signal from lead-out terminal T3, IGCT 13 is switched on.In addition, by current limitation resistor 18 in IGCT
13 cathode currents flowed through are limited.When IGCT 13 is switched on, the relay 14 being connected in series relay with around
The upper overcurrent of group 14c and LED19.Thus, relay tip 14a, the 14b for being connected in series to AC lines 2 are opened, so that relay
Device 14 turns into operating state, and AC lines 2 are cut off.In addition, lighting by LED19, notifies the detection of electric leakage and cutting for AC lines 2
It is disconnected.In addition, the relay in relay 14 is connected in parallel to winding 14c for regenerating the generation on relay winding 14c
Counter electromotive force regeneration diode 20.In addition.In order to prevent the noise of IGCT 13, in the grid and earth terminal of IGCT 13
Noise prevention capacitor 21 is connected between son.
Reset switch 22 is connected between the two ends of IGCT 13.Resetted by connecting with switch 22, IGCT 13
It is disconnected.Thus, relay 14 turns into halted state, thus releases the cut-out of the AC lines 2 carried out by relay 14, and
LED19 is off.
Prior art literature
Patent document
1 Japanese Unexamined Patent Publication of patent document 9-274842
But, in the prior art, due to being forced down as control the resistance to of circuit 12 of integrated circuit, it is therefore desirable to control electricity
Multiple external parts such as the IGCT 13 beyond road 12, therefore the miniaturization of hinder device.
The content of the invention
The present invention is to research and develop in view of the above problems, the problem of it is an object of the invention to solve conventional art there is provided
A kind of earth detector for the miniaturization for reducing external part and device being realized.
The earth detector of the present invention, its imbalance by the electric current that is flowed through on AC lines and detect and leak electricity, the leakage
Electric detection means is characterised by that it possesses：Zero phase current transformer, it is carried out to the uneven of electric current flowed through on above-mentioned AC lines
Detection；Relay, it is connected in series on above-mentioned AC lines；With actuating of relay control element, passing through above-mentioned zero phase current transformer
When detecting imbalance, the actuating of relay control element makes above-mentioned relay be acted and cut off above-mentioned AC lines, it is above-mentioned after
Electrical equipment action control element is made up of MOSFET or IGBT, and is built in integrated circuit.
And then, in the earth detector of the present invention, said integrated circuit includes flowing through the constant current output element of constant current,
And acted above-mentioned relay using the constant current flowed through on above-mentioned constant current output element.
And then, in the earth detector of the present invention, after above-mentioned relay is acted, said integrated circuit subtracts
The small constant current for being acted above-mentioned relay.
And then, the present invention earth detector in, from above-mentioned relay acted it is tight after begin to pass through regulation
After time, said integrated circuit, which reduces, makes the constant current that above-mentioned relay is acted.
And then, in the earth detector of the present invention, after above-mentioned relay is acted, detect on having cut off
When stating AC lines, said integrated circuit, which reduces, makes the constant current that above-mentioned relay is acted.
And then, in the earth detector of the present invention, said integrated circuit possesses pulse generation circuit, when by above-mentioned
When zero phase current transformer detects imbalance, the pulse generation circuit makes above-mentioned actuating of relay control element carry out switch motion.
And then, in the earth detector of the present invention, including：Reset is switched, and it releases the cut-out of above-mentioned AC lines；With
State holding circuit, after electric leakage is detected, untill above-mentioned reset is operated with switch, the state holding circuit is maintained
The state of above-mentioned actuating of relay control element.
And then, in the earth detector of the present invention, possess：2nd state holding circuit, in above-mentioned state holding circuit
In the case of breaking down, the 2nd state holding circuit maintains the state of above-mentioned actuating of relay control element.
Invention effect
According to the present invention, following effect is realized：Partly leading on/off control can will can be carried out by control terminal
Volume elements part is simply built in integrated circuit, and reduces external part, so as to by equipment miniaturization.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of the structure for the 1st embodiment for representing the earth detector of the present invention.
Fig. 2 is the figure of the both end voltage for the relay winding for representing the relay shown in Fig. 1.
Fig. 3 is the circuit structure diagram of the structure for the 2nd embodiment for representing the earth detector of the present invention.
Fig. 4 is to represent that what current control terminal shown in Fig. 3 applied applies alive figure.
Fig. 5 is the circuit structure diagram of the structure for the 3rd embodiment for representing the earth detector of the present invention.
Fig. 6 is the circuit structure diagram of the structure for the 4th embodiment for representing the earth detector of the present invention.
Fig. 7 is the circuit structure diagram of the structure for the 5th embodiment for representing the earth detector of the present invention.
Fig. 8 is the figure for representing the winding current that the relay winding in the relay shown in Fig. 7 flows through.
Fig. 9 is the circuit structure diagram of the structure for the 6th embodiment for representing the earth detector of the present invention.
Figure 10 is the circuit structure diagram of the structure for the 7th embodiment for representing the earth detector of the present invention.
Figure 11 is the circuit structure diagram for the structure for representing conventional earth detector.
(symbol description)
1 AC power supplies
2 AC lines
10 earth detectors
11 ZCT (zero phase current transformer)
11a windings
11b magnetics
12 control circuits
13 IGCTs
14 relays
14a relay tips
14b relay tips
14c relay windings
15 rectification diodes
16 smoothing capacity devices
17 voltage limiting resistances
18 current limitation resistors
19 LED
20 regeneration diodes
21 noise prevention capacitors
22 resets are switched
30th, 30a, 30b, 30c, 30d, 30e, 30f earth detector
31 resets are switched
32 charging current limiting resistances
33 diodes
40th, 40a, 40b, 40c, 40d, 40e control circuit
41 interior power supply circuits (Reg)
42 constant current reference elements
43 constant current output elements
44 constant current resistance
45 threshold voltage sources
46 comparators
47 latch cicuits
48 inverters
49 actuating of relay control elements
50 resistance
51 inverters
52 pulse generation circuits
53 the 1st constant-current circuits
54 the 2nd constant-current circuits
55 constant currents switching switch
56 timers
57 comparators
58 reference voltage sources
59 diodes
60 smoothing capacity devices
61 PNP transistors
62 resistance
T1 ZCT input terminals
T2 ZCT input terminals
T3 lead-out terminals
T4 Vcc terminals
T5 GND terminals
T6 current control terminals
T7 reseting terminals
T8 internal electric source lead-out terminals
Embodiment
Below, referring to the drawings, embodiments of the present invention are specifically described.In addition, in each figure, for identical
Structure, assign identical symbol and simultaneously omit a part of explanation.
(the 1st embodiment)
The earth detector 30 of the embodiment of reference picture the 1, the 1st includes：ZCT(Zero-Phase-Current-
Transformer：Zero phase current transformer) 11, it detects that the outlet for the AC lines 2 for being connected to AC power supplies 1 is different from the current value in return road
Imbalance；Relay 14, it cuts off AC lines 2；Control circuit 40, its output by ZCT11 and detect electric leakage, and make relay
Device 14 is acted；Rectification diode 15；Smoothing capacity device 16；LED19；And reset with switch 31.
ZCT11 is made up of winding winding 11a circular magnetic 11b, and the insertion of AC lines 2 is in magnetic 11b circle.
When occurring electric leakage and occur difference on the current value in the outlet of AC lines 2 and return road, it is wound on magnetic 11b winding 11a
Generation electromotive force, winding 11a both end voltage as ZCT export and be input into control circuit 40 ZCT input terminals T1,
T2。
Relay 14 includes relay tip 14a, the 14b for being connected in series to AC lines 2 and driving relay tip 14a, 14b
Relay winding 14c.Relay 14 applies defined voltage to relay winding 14c and flows through electric current, so as to turn into
The emancipated operating state of relay tip 14a, 14b, and cut off AC lines 2.
Control circuit 40 be include ZCT input terminals T1, T2, Vcc terminal T4, GND terminal T5, current control terminal T6,
Reseting terminal T7 semiconductor integrated circuit (IC).In addition, control circuit 40 includes：Interior power supply circuit (Reg) 41, constant current base
Quasi-element 42, constant current output element 43, constant current resistance 44, threshold voltage source 45, comparator 46, latch cicuit 47, inverter
48th, actuating of relay control element 49.
One in AC lines 2 is connected in series with rectification diode 15 and smoothing capacity device 16 between line and ground terminal.
The Vcc terminal T4 of control circuit 40 is connected at the tie point between rectification diode 15 and smoothing capacity device 16, and is controlled
The GND terminal T5 of circuit 40 processed is connected to ground terminal.Thus, the voltage of AC lines 2 is put down by smoothing capacity device 16
It is sliding, and the Vcc terminal T4 for controlling circuit 40 is input to as power source voltage Vcc.
In addition, in current control of the rectification with the tie point between diode 15 and smoothing capacity device 16 and control circuit 40
Relay the winding 14c and LED19 of relay 14 are connected in series between terminal T6.In addition, in the relay of relay 14
It is connected in parallel to winding 14c for regenerating the regeneration diode 20 in the relay winding 14c counter electromotive forces occurred.
The constant current reference element 42 and constant current output element 43 for controlling circuit 40 are the circuit for constituting current mirroring circuit, example
Such as, by MOSFET (metal-oxide-semiconductor field-effect transistor, field-effect transistor) structure
Into.Internally constant current resistance 44 and constant current are connected in series between the lead-out terminal and GND terminal T5 of power circuit (Reg) 41
Reference element 42, is connected with constant current output element 43 between current control terminal T6 and GND terminal T5.Also, constant current benchmark
The grid of element 42 is connected with the grid of constant current output element 43, and the tie point is connected to the drain electrode of constant current reference element 42.
The negative terminal of threshold voltage source 45 is connected to ZCT input terminal T1, the connection of the Zheng Very terminals of threshold voltage source 45
To the inversing input terminal of comparator 46.In addition, the non-inverting input terminal in comparator 46 is connected with ZCT input terminals T2.
Thus, 46 pairs of comparator is input to ZCT input terminals T1, T2 ZCT outputs and is set in the detection of electrical leakage of threshold voltage source 45
Threshold voltage is compared, and when ZCT outputs exceed detection of electrical leakage threshold voltage, exports high level signal.
Latch cicuit 47 is made up of RS type flip-flop.The lead-out terminal of comparator 46 is connected to the setting end of latch cicuit 47
Sub- S, the lead-out terminal of interior power supply circuit (Reg) 41 is connected to the reset of latch cicuit 47 via resistance 50 and inverter 51
Terminal R.Also, the tie point of resistance 50 and inverter 51 is connected to reseting terminal T7.In addition, the lead-out terminal of latch cicuit 47
Q is connected to the control terminal of constant current reference element 42 via inverter 48.
Actuating of relay control element 49 by the semiconductor element of on/off control can be carried out by control terminal,
For example, MOSFET, IGBT (Insulated gate bipolar transistor, insulating gate type bipolar transistor) are constituted,
And be connected in parallel with constant current reference element 42.In the present embodiment, to being used as actuating of relay control element 49
MOSFET example is illustrated.
Exceed detection of electrical leakage threshold voltage when the ZCT from ZCT11 is exported, and export high from the lead-out terminal of comparator 46
During level signal, latch cicuit 47 is set.When latch cicuit 47 is set, the lead-out terminal Q's from latch cicuit 47
High level is output into, the inverter 48 for being input to the grid (control terminal) of actuating of relay control element 49 is output into
Low level, actuating of relay control element 49 is disconnected.When actuating of relay control element 49 is disconnected, in constant current benchmark member
The constant current determined by the resistance value of constant current resistance 44 is flowed through on part 42 and constant current output element 43.Thus, to current control
Terminal T6 flows into constant current, flows into constant current with winding 14c and LED19 to the relay of relay 14, and be connected in series to AC lines 2
Relay tip 14a, 14b be opened, thus relay 14 turn into operating state, AC lines 2 be cut off.In addition, passing through LED19
Light, notify electric leakage detection and AC lines 2 cut-out.
In addition to except the reason for electric leakage, even if comparator 46 is output into low level, inflow current control terminal T6's
Constant current is latched circuit 47 and latches and continue to flow through, so as to maintain the dissengaged positions of AC lines 2.By being connected to control circuit 40
Reset between reseting terminal T7 and ground terminal carries out the reset of latch cicuit 47 with switch 31.Switched when connecting reset
When 31, the input of inverter 51 turns into low level, and inverter 51 is output into high level, and latch cicuit 47 is resetted.When
When latch cicuit 47 resets, the lead-out terminal Q's from latch cicuit 47 is output into low level, is input to actuating of relay control
The inverter 48 of the grid (control terminal) of element 49 processed is output into high level, and actuating of relay control element 49 is connect
It is logical.Thus, constant current reference element 42 and constant current output element 43 turn into off-state, stop flowing into perseverance to current control terminal T6
Stream.Thus, relay 14 turns into halted state, and releases the cut-out of the AC lines 2 carried out by relay 14, and LED19 is off.Should
State is the A-stage before detection electric leakage.
In the conventional earth detector 10 shown in Figure 11, in connection IGCT 13 in the relay of relay 14
In the case of flowing through winding current with winding 14c, its current value is limited by current limitation resistor 18.In this case, such as
Shown in Fig. 2 (a), the both end voltage of smoothing capacity device 16 is arteries and veins stream, therefore is such as represented by dashed line in Fig. 2 (b), relay
Changed with winding 14c both end voltage and turn into noise source.In addition, being applied to the relay winding 14c of relay 14 electricity
The specification of pressure has upper and lower bound, is usually ± 5% degree.Therefore, it is necessary to by relay winding 14c both end voltage
Suppression is changed in the specification of relay 14, it is necessary to increase the electric capacity of capacitor 16, the thus miniaturization of hinder device.In addition,
Dotted line waveform shown in Fig. 2 (a) be without smoothing capacity device 16 in the case of rectification diode 15 commutating voltage.
In this regard, in the earth detector 30 of present embodiment, the current control terminal of circuit 40 is controlled by flowing into
T6 constant current and acted relay 14, therefore, with the winding 14c winding currents flowed through be in the relay of relay 14
Constant current, indicated by the solid line such as in Fig. 2 (b), relay is constant with winding 14c both end voltage.Thereby, it is possible to by electric capacity
The small capacitances of device 16, realize the miniaturization of device.
(the 2nd embodiment)
Bases of the earth detector 30a of the embodiment of reference picture the 3, the 2nd in the earth detector 30 of the 1st embodiment
On plinth, charging current limiting resistance 32 and diode 33 are also equipped with.Charging current limiting resistance 32 is connected to rectification diode
Between 15 and smoothing capacity device 16, diode 33 is connected in parallel with charging current limiting resistance 32.The anode connection of diode 33
To at the tie point between charging current limiting resistance 32 and smoothing capacity device 16, the negative electrode of diode 33 is connected to rectification and uses two
At tie point between pole pipe 15 and charging current limiting resistance 32.
In Fig. 4 (a), the smoothing capacity device in the earth detector 30 for representing the 1st embodiment by single dotted broken line
The two ends electricity of smoothing capacity device 16 in 16 both end voltage, the earth detector 30a for representing the 2nd embodiment by solid line
Pressure.And then, in Fig. 4 (b), the current control into the earth detector 30 of the 1st embodiment is represented from single dotted broken line
The application voltage that terminal T6 applies, the current control terminal into the earth detector 30a of the 2nd embodiment is represented from solid line
The application voltage that T6 applies.As shown in figure 4, in the earth detector 30a of the 2nd embodiment, being limited by charging current
Resistance 32 and cause the both end voltage of smoothing capacity device 16 to decline, therefore the smoothing capacity device 16 exported by diode 33
Discharge voltage declines, and also declines to the current control terminal T6 application voltages applied.Thereby, it is possible to reduce constant current output element 43
Consumption electric power.And then, the charging current of smoothing capacity device 16 is limited by charging current limiting resistance 32, therefore flat
The life-span of sliding capacitor 16 is also elongated.
(the 3rd embodiment)
Reference picture 5, in the earth detector 30b of the 3rd embodiment, including replaces the control electricity of the 1st embodiment
The inverter 48 on road 40 and provided with pulse generation circuit 52 control circuit 40a.Pulse generation circuit 52 will come from latch cicuit
47 lead-out terminal Q output is redefined for the output of pulse signal of high level to the grid of actuating of relay control element 49
Pole (control terminal), makes actuating of relay control element 49 carry out switch motion.Thus, intermittently to current control terminal T6
Constant current is flowed into, consumption electric power can be reduced.In addition, stop to current control terminal T6 flow into constant current in a period of, accumulate in
Relay is regenerated with winding 14c energy in regeneration diode 20, and electric current is flowed through in relay winding 14c.Thus, i.e.,
Just stop flowing into constant current to current control terminal T6, relay 14 also can continue to maintain operating state.
(the 4th embodiment)
The earth detector 30c of the embodiment of reference picture the 6, the 4th is deleted in the control circuit 40a of the 3rd embodiment
Except constant current reference element 42, constant current output element 43 and constant current resistance 44, and it is included in current control terminal T6 and is directly connected to
The control circuit 40b of the drain electrode of actuating of relay control element 49 is formed.Also, pass through the arteries and veins from pulse generation circuit 52
Rush signal and actuating of relay control element 49 is carried out switch motion, so as to intermittently be flowed into current control terminal T6 permanent
Stream, can reduce consumption electric power.In addition, in the 4th embodiment, when connecting actuating of relay control element 49, electric current stream
Enter current control terminal T6.Inflow current control terminal T6 electric current, i.e., flow through in the relay winding 14c of relay 14
Winding current is limited by the current limitation resistor 18 that the relay with relay 14 is connected in series with winding 14c.It is logical
The resistance value for changing current limitation resistor 18 is crossed, so as to arbitrarily set inflow current control terminal T6 electric current.In addition,
In a period of disconnection actuating of relay control element 49 stops to current control terminal T6 inflow currents, accumulate in relay
Regenerated with winding 14c energy in regeneration diode 20, and electric current is flowed through in relay winding 14c.Thus, even if stopping
Only to current control terminal T6 inflow currents, relay 14 also can continue to maintain operating state.
(the 5th embodiment)
The earth detector 30d of the embodiment of reference picture the 7, the 5th includes control circuit 40c, in control circuit 40c
It is provided with：1st constant-current circuit 53, it is connected between current control terminal T6 and GND terminal T5；Series circuit, its by with it is the 1st permanent
Constant current switching the 55 and the 2nd constant-current circuit 54 of switch that current circuit 53 is connected in parallel is constituted；And timer 56.Also, by the 1st constant current
The constant-current circuit 54 of circuit 53 and the 2nd, the constant current reference element 42 of the 1st embodiment, constant current output element 43 and constant current resistance
44 are constituted, and are turned on/off according to the output of inverter 48.When the output of latch cicuit 47 becomes high level, timing
Device 56 disconnects constant current switching switch 55 after the stipulated time set in advance.
By the structure, when T1 detects electric leakage at the time of shown in Fig. 8, and latch cicuit 47 is output into high electricity
Flat, when being output into low level of inverter 48, the 1st constant-current circuit 53 and the 2nd constant-current circuit 54 are acted.Thus, flow into
Current control terminal T6 electric current, i.e., turning into the relay winding 14c of relay 14 winding currents flowed through will be by the 1
Constant-current circuit 53 and the constant current generated and the value that is added of constant current generated by the 2nd constant-current circuit 54.Also, in the stipulated time
T2 at the time of afterwards, constant current switching switch 55 is disconnected by timer 56, and cut off the 2nd constant-current circuit 54.In relay 14
Relay be only dropped to the winding 14c winding currents flowed through by the 1st constant-current circuit 53 generate constant current.Thus, examine
Measure electric leakage, to need electric current AC lines 2 are cut off by relay tip 14a, 14b untill (during A), can flow through more
Winding current.Also, terminate, by the cut-out of relay tip 14a, 14b AC lines 2 carried out, to cut not needing the holding of electric current very much
Disconnected (during B), can reduce winding current, can reduce control circuit 40c consumption electric power.
(the 6th embodiment)
The earth detector 30e of the embodiment of reference picture the 9, the 6th includes the control circuit 40c instead of the 4th embodiment
In timer 56 and provided with comparator 57, reference voltage source 58, diode 59 and smoothing capacity device 60 control circuit 40d.
Control circuit 40d using comparator 57 to being set in the reference voltage of reference voltage source 58 and by diode 59, smoothing capacity
Device 60 and smooth voltage is carried out to the voltage of AC lines 2 and is compared, so as to detect that AC lines 2 are cut off, and switch constant current
Switch 55 disconnects.Thus, identically with the 5th embodiment, relay tip 14a, 14b terminate the cut-out of AC lines 2, are not needing very much
(during the B) that is kept switched off of electric current is wanted, winding current can be reduced, and control circuit 40c consumption electric power can be reduced.
(the 7th embodiment)
Reference picture 10, in the earth detector 30f of the 7th embodiment, passes through the output end from control circuit 40e
Sub- T3 output and control external actuating of relay control element 49.In control circuit 40e, the output end of latch cicuit 47
Sub- Q is connected with lead-out terminal T3, and provided with internal electric source lead-out terminal T8, the internal electric source lead-out terminal T8 and internal electric source electricity
The lead-out terminal connection on road (Reg) 41.In addition, being connected with PNP between the gate-to-drain of actuating of relay control element 49
Transistor 61.In PNP transistor 61, base stage is connected to the drain electrode of actuating of relay control element 49, colelctor electrode be connected to after
The base stage of electrical equipment action control element 49, emitter stage is connected to internal electric source lead-out terminal T8.Also, actuating of relay control member
The base stage of part 49 is connected to ground terminal via resistance 62.
By the structure, circuit 40e lead-out terminal T3 is being controlled for high level and actuating of relay control member has been connected
After part 49, in the case of causing lead-out terminal T3 to be unable to maintain that high level controlling circuit 40e failure, by PNP
Transistor 61 flows through electric current, so as to continue to turn on actuating of relay control element 49.In addition, when control circuit 40e's
When lead-out terminal T3 turns into low level, actuating of relay control element 49 is disconnected.Thus, even if control is by passing through control terminal
And the control circuit 40e for the actuating of relay control element 49 that the semiconductor element that can carry out on/off control is constituted occurs
Failure, can also make to maintain dissengaged positions by the AC lines 2 for detecting electric leakage and cutting off.In addition, controlling member in the actuating of relay
In the case that part 49 is built in control circuit 40e, same action is also carried out.
As described above, the 1st~6 embodiment is detected Lou for the imbalance in the electric current by being flowed through in AC lines 2
The earth detector 30 of electricity, in 30a, 30b, 30c, 30d, 30e, 30f, possess：ZCT11, it is to the electric current that is flowed through in AC lines 2
Imbalance detected；Relay 14, it is connected in series on AC lines 2；And actuating of relay control element 49, passing through
When ZCT11 detects imbalance, the actuating of relay control element 49 is acted relay 14 and cuts off AC lines 2, wherein,
Actuating of relay control element 49 is made up of MOSFET or IGBT, and be built in as the control unit 40 of integrated circuit, 40a,
40b、40c、40d., can be by by the semiconductor element of on/off control can be carried out by control terminal by the structure
The actuating of relay control element 49 that i.e. MOSFET, IGBT are constituted simply is built in integrated circuit, and reduces external part, from
And can be by equipment miniaturization.
And then, according to the 1st~3,5,6 embodiment, control unit 40,40a, 40c, 40d include flowing through the constant current of constant current
Output element 43, and acted relay 14 using in the constant current that constant current output element 43 flows through.Pass through the structure, energy
Enough make relay winding 14c both end voltage constant, therefore, it is possible to the electricity by winding current is supplied with winding 14c to relay
Container 16 realizes small capacitances, can be by equipment miniaturization.
And then, according to the 5th, 6 embodiment, control unit 40c, 40d after relay 14 is acted, reduction make after
The constant current that electrical equipment 14 is acted.From relay 14 acted it is tight after begin to pass through be timed device 56 setting stipulated time
Afterwards, control unit 40c, which reduces, makes the constant current that relay 14 is acted.After relay 14 is acted, cut-out is detected
During AC lines 2, control unit 40d, which reduces, makes the constant current that relay 14 is acted.By the structure, terminate by relay tip
The cut-out for the AC lines 2 that 14a, 14c are carried out, is not needing (during the B) that is kept switched off of electric current, can reduce winding current very much,
And control circuit 40c consumption electric power can be reduced.
And then, according to the 3rd, 4 embodiments, control unit 40a, 40b possess pulse generation circuit 52, when by ZCT11
When detecting imbalance, the pulse generation circuit 52 makes actuating of relay control element 19 carry out switch motion.By the structure,
By making actuating of relay control element 49 carry out switch motion, so that constant current intermittently is flowed into current control terminal T6,
So as to reduce consumption electric power.
And then, according to the 1st~7 embodiment, earth detector 30,30a, 30b, 30c, 30d, 30e, 30f include：It is multiple
Position switch 31, it releases the cut-out of AC lines 2；Latch cicuit 47, after electric leakage is detected, is carried out to resetting with switch 31
Untill operation, the latch cicuit 47 act as maintaining the state holding circuit of the state of actuating of relay control element 49.Pass through
The structure, even if constituting actuating of relay control by the semiconductor element of on/off control can be carried out by control terminal
Element 49 processed, untill being operated to reset with switch 31, is also able to maintain that the state of actuating of relay control element 49.
And then, according to the 7th embodiment, including PNP transistor 61 and resistance 62, it is acting as the lock of state holding circuit
Deposit in the case that circuit 47 breaks down, the PNP transistor 61 and resistance 62 act as maintaining actuating of relay control element 49
State the 2nd state holding circuit.By the structure, even if event occurs for the latch cicuit 47 for acting as state holding circuit
Barrier, is also able to maintain that the state of actuating of relay control element 49, therefore, it is possible to ensure safety.
Additionally, this invention is not limited to each above-mentioned embodiment, in the range of the technological thought of the present invention, can suitably it change
Each embodiment.In addition, the quantity of above-mentioned component parts, position, shape etc. are not limited to above-mentioned embodiment, it may be set to fit
In quantity, position, shape for implementing the present invention etc..In addition, in each figure, identical symbol is assigned for identical constitutive requirements
Number.
Claims (8)
1. a kind of earth detector, its detection electric leakage, detection of electrical leakage dress using the imbalance of the electric current flowed through in AC lines
Put and be characterised by, it possesses：
Zero phase current transformer, it is detected to the uneven of electric current flowed through on above-mentioned AC lines；
Relay, it is connected in series on above-mentioned AC lines；And
Actuating of relay control element, when detecting imbalance by above-mentioned zero phase current transformer, actuating of relay control member
Part makes above-mentioned relay be acted and cut off above-mentioned AC lines,
Above-mentioned actuating of relay control element is made up of MOSFET or IGBT, and is built in integrated circuit.
2. earth detector according to claim 1, it is characterised in that
Said integrated circuit includes flowing through the constant current output element of constant current, and utilizes the perseverance flowed through on above-mentioned constant current output element
Flow and acted above-mentioned relay.
3. earth detector according to claim 2, it is characterised in that
After above-mentioned relay is acted, said integrated circuit, which reduces, makes the constant current that above-mentioned relay is acted.
4. earth detector according to claim 3, it is characterised in that
From above-mentioned relay acted it is tight after begin to pass through the stipulated time after, said integrated circuit, which reduces, makes above-mentioned relay
The constant current that device is acted.
5. earth detector according to claim 3, it is characterised in that
After above-mentioned relay is acted, detect when having cut off above-mentioned AC lines, said integrated circuit reduce make it is above-mentioned after
The constant current that electrical equipment is acted.
6. the earth detector described in any one in claim 1-5, it is characterised in that
Said integrated circuit possesses pulse generation circuit, when detecting imbalance by above-mentioned zero phase current transformer, the pulse
Generative circuit makes above-mentioned actuating of relay control element carry out switch motion.
7. the earth detector described in any one in claim 1-6, it is characterised in that
The earth detector possesses：Reset is switched, and it releases the cut-out of above-mentioned AC lines；With state holding circuit, checking
To after electric leakage, untill being operated to above-mentioned reset with switch, the state holding circuit maintains above-mentioned actuating of relay control
The state of element processed.
8. the earth detector described in any one in claim 1-6, it is characterised in that
The earth detector possesses the 2nd state holding circuit, in the case where above-mentioned state holding circuit breaks down, and this
2 state holding circuits maintain the state of above-mentioned actuating of relay control element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-181702 | 2015-09-15 | ||
| JP2015181702A JP2017060250A (en) | 2015-09-15 | 2015-09-15 | Electric leakage detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106970288A true CN106970288A (en) | 2017-07-21 |
Family
ID=58390831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610825651.3A Withdrawn CN106970288A (en) | 2015-09-15 | 2016-09-14 | Earth detector |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2017060250A (en) |
| CN (1) | CN106970288A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959837A (en) * | 2017-12-25 | 2019-07-02 | 北京兆易创新科技股份有限公司 | A kind of electric-leakage detection circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879600A (en) * | 2018-08-24 | 2018-11-23 | 广东好太太科技集团股份有限公司 | A kind of clothes airing machine leakage protection system and its earth leakage protecting method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2062510U (en) * | 1989-11-07 | 1990-09-19 | 江西省华夏实业发展总公司 | Civil limit electricity and leakage safety device |
| CN2728067Y (en) * | 2004-09-20 | 2005-09-21 | 王继存 | Self-reset leakage protector |
| US20050286184A1 (en) * | 2004-06-22 | 2005-12-29 | Steve Campolo | Electrical power outlet strip |
| CN201051653Y (en) * | 2006-12-21 | 2008-04-23 | 刘在能 | Automatic controller for multi-function electric current leakage fire |
| CN101420116A (en) * | 2008-12-04 | 2009-04-29 | 临安亿安电子有限公司 | Intelligent integrated electricity leakage protection device |
| CN103036198A (en) * | 2012-12-03 | 2013-04-10 | 佛山市顺德区澳骏电子科技有限公司 | Multi-functional safe electricity leakage protection device capable of preventing false wiring of power socket |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4963437U (en) * | 1972-09-14 | 1974-06-04 | ||
| JP3540604B2 (en) * | 1998-05-26 | 2004-07-07 | 三菱電機株式会社 | Earth leakage breaker |
| JP5166730B2 (en) * | 2006-12-28 | 2013-03-21 | 河村電器産業株式会社 | Three-phase earth leakage breaker |
| JP2015153556A (en) * | 2014-02-13 | 2015-08-24 | パナソニックＩｐマネジメント株式会社 | Relay drive circuit and relay module using the same |
-
2015
- 2015-09-15 JP JP2015181702A patent/JP2017060250A/en active Pending
-
2016
- 2016-09-14 CN CN201610825651.3A patent/CN106970288A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2062510U (en) * | 1989-11-07 | 1990-09-19 | 江西省华夏实业发展总公司 | Civil limit electricity and leakage safety device |
| US20050286184A1 (en) * | 2004-06-22 | 2005-12-29 | Steve Campolo | Electrical power outlet strip |
| CN2728067Y (en) * | 2004-09-20 | 2005-09-21 | 王继存 | Self-reset leakage protector |
| CN201051653Y (en) * | 2006-12-21 | 2008-04-23 | 刘在能 | Automatic controller for multi-function electric current leakage fire |
| CN101420116A (en) * | 2008-12-04 | 2009-04-29 | 临安亿安电子有限公司 | Intelligent integrated electricity leakage protection device |
| CN103036198A (en) * | 2012-12-03 | 2013-04-10 | 佛山市顺德区澳骏电子科技有限公司 | Multi-functional safe electricity leakage protection device capable of preventing false wiring of power socket |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959837A (en) * | 2017-12-25 | 2019-07-02 | 北京兆易创新科技股份有限公司 | A kind of electric-leakage detection circuit |
| CN109959837B (en) * | 2017-12-25 | 2021-03-30 | 北京兆易创新科技股份有限公司 | Electric leakage detection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2017060250A (en) | 2017-03-23 |
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Application publication date: 20170721 |
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