CN102761272A - A power circuit and a leakage circuit-breaker employing the same - Google Patents
A power circuit and a leakage circuit-breaker employing the same Download PDFInfo
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- CN102761272A CN102761272A CN2012100805529A CN201210080552A CN102761272A CN 102761272 A CN102761272 A CN 102761272A CN 2012100805529 A CN2012100805529 A CN 2012100805529A CN 201210080552 A CN201210080552 A CN 201210080552A CN 102761272 A CN102761272 A CN 102761272A
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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
- H02H3/16—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 fault current to earth, frame or mass
- H02H3/162—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 fault current to earth, frame or mass for ac systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/125—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M3/135—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M3/137—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a power circuit and a leakage circuit-breaker employing the same. The power circuit realizes miniaturization and electricity economization through reduction of consumed electricity in exceptional state and restriction of maximum power capacity. The power circuit comprises a rectifying unit (13) which converts alternating current voltage supplied by an alternating power source (1) to direct current voltage; a first voltage reduction unit (14) which reduces the output voltage of the rectifying unit; and a second voltage reduction unit (17) which further reduces the output voltage reduced by the first voltage reduction unit, wherein the first voltage reduction unit (14) is formed by series regulators, the second voltage reduction unit (17) is formed by switching regulators, and the output voltages of the first voltage reduction unit (14) and the second voltage reduction unit (17) are used as power supply.
Description
Technical field
The present invention relates to a kind of power circuit in RCCB of being connected with alternating current circuit etc. and RCCB that uses this power circuit of being built in.
Background technology
This power circuit that is built in the RCCB; After the alternating voltage that will supply with from alternating current circuit (for example AC 100V, 200V, 440V etc.) utilizes rectification unit to be transformed to direct voltage; Utilize pressure unit to be transformed to the direct voltage (for example DC 24V) of low-voltage the direct voltage after the rectification, and supply with to electric-leakage detection circuit and tripgear as driving power.
In this power circuit, adopt the series controller of constant pressure type or constant current mode in the pressure unit mostly, with when suppressing power consumption, the input voltage that can tackle wide region is (for example, with reference to patent documentation 1 and patent documentation 2.)。
In addition; In RCCB; Have in alternating current circuit to make under the situation of the electric leakage of producing and open and close the leakage tripping device that breaks off the contact and be used for detection of electrical leakage and the leakage tripping function test function whether proper function is checked termly; The electric power that they consumed also from the output voltage of above-mentioned constant voltage source or constant-current supply directly or via supplying with (for example, with reference to patent documentation 3 and patent documentation 4 as the constant voltage source of series controller.)。
Patent documentation 1: Japan's special fair 7-57062 communique (Fig. 1 and explanation thereof)
Patent documentation 2: TOHKEMY 2009-95125 communique (Fig. 1 and explanation thereof)
Patent documentation 3: TOHKEMY 2005-137095 communique (Fig. 1 and explanation thereof)
Patent documentation 4: TOHKEMY 2006-302601 communique (Fig. 2 and explanation thereof)
Summary of the invention
As noted above; In the power circuit of existing RCCB, the summation of the current sinking of the current sinking of electric-leakage detection circuit, leakage tripping device and test function becomes the load current of the series controller of constant pressure type or constant current mode after the rectification; Therefore; Must the power supply capacity of this series controller be increased, on the contrary, because the restriction of this series controller volume and the heating problem that accompanies with loss and can't increase under the situation of power supply capacity; Must suppress to supply with to the power supply of leakage tripping device and test function, generation can't be guaranteed the problem of actuating force and the measuring current of required leakage tripping device etc.
In addition, as the resolution policy of this problem, also consider to use in the pressure unit after rectification switching regulaor efficiently; But under the voltage condition with higher of alternating current circuit, for example under the situation in considering to be used in the alternating current circuit of AC 440V, because the voltage after the rectification becomes the voltage above 600V; So the switch element that uses in the switching regulaor must have high resistance to pressure and can carry out speed-sensitive switch, but the small-sized and switch element that satisfies this condition is difficult to obtain hardly producing; And for to higher voltage carrying out at a high speed switch, and need bigger drive current, because along with the difference of situation for switch element; Can become and consume drive current more than or equal to load current; Therefore, the loss (switching losses) that switch causes is bigger by carrying out, and can't obtain using the effect of switching regulaor.
In addition, if utilize switching regulaor to carry out speed-sensitive switch the high voltage after the rectification, then can't avoid switching noise to propagate to alternating current circuit, problems such as interference possibly generate electromagnetic waves.Therefore; Append the noise countermeasure parts and the circuit that are used for absorption of noise; Or use the unit that wittingly the switching waveform passivation is reduced generating noise itself, but because appending of noise countermeasure parts etc. makes circuit scale become big, in addition; Switching losses is increased the countermeasure of switching waveform passivation, so there are the problems such as effect that can't obtain using switching regulaor.
The present invention proposes in order to solve above-mentioned problem, and its purpose is, obtains a kind of power circuit and RCCB; It is with the internal electric source of circuit breaker internal consumption; When normality, only use from the power supply of series controller and supply with, only when test action or during the electric leakage action etc. when abnormal, the power supply that uses switching regulaor to realize is supplied with; Current sinking when suppressing abnormal, thus realize miniaturization and economize electrification.
Power circuit involved in the present invention has: rectification unit, and it will be direct voltage from the AC voltage conversion that AC power is supplied with; The 1st pressure unit, its output voltage with this rectification unit carries out step-down; And the 2nd pressure unit; It will be by the further step-down of output voltage after said the 1st pressure unit step-down; Said the 1st pressure unit is made up of series controller; Said the 2nd pressure unit is made up of switching regulaor, and each output voltage of said the 1st pressure unit and said the 2nd pressure unit all uses as power supply.
The effect of invention
In the present invention, have: rectification unit, it will be direct voltage from the AC voltage conversion that AC power is supplied with; The 1st pressure unit, its output voltage with this rectification unit carries out step-down; And the 2nd pressure unit, it will be by the further step-down of output voltage after said the 1st pressure unit step-down, and said the 1st pressure unit is made up of series controller; Said the 2nd pressure unit is made up of switching regulaor; Each output voltage of said the 1st pressure unit and said the 2nd pressure unit all uses as power supply, therefore, through under the normality state only by the series controller supply capability; Only when abnormal, utilize switching regulaor to supply with required electric power; Thereby the influence of switch noise inhibiting, and reduce the whole consumes electric power of device, therefore can realize the miniaturization of power circuit and province's electrification of device.
Description of drawings
Fig. 1 is that expression is used the power circuit in the execution mode 1 of the present invention and the circuit diagram of the example of the RCCB that constitutes.
Fig. 2 is that expression is used the power circuit in the execution mode 2 of the present invention and the circuit diagram of the example of the RCCB that constitutes.
Fig. 3 is that expression is used the power circuit in the execution mode 3 of the present invention and the circuit diagram of the example of the RCCB that constitutes.
Embodiment
Below, according to Fig. 1, execution mode 1 of the present invention is described.Fig. 1 is that expression is used the power circuit in the execution mode 1 of the present invention and the block diagram of the structure of the RCCB that constitutes.
In Fig. 1, RCCB 100 utilizes following part to constitute opening circuit and the detection of electrical leakage function of RCCB, opens and closes contact 2 that is:, and it opens and closes alternating current circuit; Electric-leakage detection circuit 4, it is connected with zero phase sequence currenttransformer 3 in being inserted into alternating current circuit 1, and the output signal based on from 2 winding 3a of zero phase sequence currenttransformer 3 detects electric leakage; Breaking coil 6, it is according to the output signal of this electric-leakage detection circuit 4 and switch on via switch element 5; And tripgear 7, it drives when these breaking coil 6 energisings and switching contact 2 is separated.
In addition; RCCB 100 constitutes; Have the user of service and be used to test the Test Switchboard 8 of leakage function; If with these Test Switchboard 8 closures, then to test circuit 9 supply powers that generate measuring current, through by test circuit 9 to the pulse signal of switch element 10 outputs with alternating current circuit 1 same frequency; Thereby from 3 the winding 3bs of internal electric source on being arranged at zero phase sequence currenttransformer 3 of RCCB, flow through the test that utilizes limiting resistance 11 to be adjusted into the rated current value and use the simulation leakage current.
In addition; Electric-leakage detection circuit 4, breaking coil 6, test circuit 9 and the measuring current that makes 3 winding 3b excitations with the output interlock of test circuit 9; The electric energy that need be used for moving respectively, but this electric energy is based on via generating with the direct voltage V1 of the current-limiting resistance that respectively is connected 12 after full-wave rectifying circuit 13 is supplied with also full-wave rectification of alternating current circuit 1.In addition, current-limiting resistance 12 is to be used for when on alternating current circuit 1, applying high voltage such as lightning surge, prevents to flow into excessive electric current to full-wave rectifying circuit 13 resistance that full-wave rectifying circuit 13 later internal circuits are protected.
For the direct voltage V1 after the full-wave rectification; Though reduce slightly because of current-limiting resistance 12 makes voltage; But owing to be that alternating current circuit 1 has only been carried out the high voltage after the full-wave rectification; Be depressurized to middle assigned voltage through the 1st series controller 14, generate ripples (ripple) through smmothing capacitor 15 and obtained the direct voltage V2 that suppresses as the voltage step-down unit.Further, this direct voltage V2 is depressurized to direct voltage V3 and stabilisation about about 5V through as the 2nd series controller 16 of voltage step-down unit, and this direct voltage V3 uses as the power supply of electric-leakage detection circuit 4 and test circuit 9.In addition; Also make direct voltage V2 be depressurized to direct voltage V4 through the 1st switching regulaor 17 as the voltage step-down unit, this direct voltage V4 as the driving of breaking coil 6 with power supply and the measuring current of 3 winding 3b excitations of zero phase sequence currenttransformer 3 is used with power supply.
Below, the power consumption under the state separately during to the normality state of RCCB and leakage tripping, during test action describes.
At first; In the normality state of RCCB, become breaking coil 6 and test function and be failure to actuate, only the state that moves of electric-leakage detection circuit 4; In Fig. 1, the current sinking Ia of electric-leakage detection circuit 4 directly becomes the load current of the 1st series controller 14 and the 2nd series controller 16.
Usually; Owing in series controller, there are some losses; So the input current of series controller and the relation of output current become input current＞output current; But here; If loss is made as the smaller value that to ignore degree; And be made as input current
output current, then become Ia
Ib
Ic
Id
Ie.
In addition, because the loss of series controller is the potential difference of input voltage and output voltage and load current is amasss, so the loss P1 of the 1st series controller 14 becomes P1=(V1-V2) Ia, the loss P2 of the 2nd series controller 16 becomes P2=(V2-V3) Ia.
The numeral that trial substitution in formula is concrete.If V1 is made as 400V with direct voltage, V2 is made as 40V with direct voltage, and V3 is made as 5V with direct voltage, and the current sinking Ia of electric-leakage detection circuit 4 is made as 1mA, and then the loss P 1 of the 1st series controller 14 becomes,
P?1＝(V1-V2)·Ia＝(400-40)·0.001＝0.36W，
The loss P2 of the 2nd series controller 16 becomes,
P2＝(V2-V3)·Ia＝(40-5)·0.001＝0.035W。
Below, the power consumption during to the leakage tripping of RCCB describes.
When leakage tripping, supply with the electric current I f that is used to drive breaking coil 6 from the 1st switching regulaor 17.In addition, here, if hypothesis is not carried out test action, electric current I j=0 then, the output current Ih=If of the 1st switching regulaor 17.
Here, if the efficient of the 1st switching regulaor 17 is made as α, then
The input current Ig of the 1st switching regulaor 17 by
Ig=V4/V2/ α If representes,
The loss P3 of the 1st switching regulaor 17 becomes
P3＝(V2-V4)·Ig·(1-α)
＝(V2-V4)·V4/V2/α·If·(1-α)。
In addition, the loss P1 of the 1st series controller 14 becomes
P1＝(V1-V2)·Ib
＝(V1-V2)·(Ig+Id)
＝(V1-V2)·(Ia+V4/V2/α·If)，
If the drive current If of breaking coil 6 is made as 40mA, the efficient α of the 1st switching regulaor 17 is made as 0.8, then
The loss P3 of the 1st switching regulaor 17 becomes
P3＝(V2-V4)·V4/V2/α·If·(1-α)
＝(40-20)·40/20/0.8·0.04·(1-0.8)
＝0.1W
The loss P 1 of the 1st series controller 14 becomes
P1＝(V1-V2)·(Ia+V4/V2/α·If)
＝(400-40)·(0.001+20/40/0.8·0.04)
＝9.36W
In addition, for the loss P2 of the 2nd series controller 16, owing to be the condition identical with the normality state, so P2=0.035W.
As noted above; Because in the 1st series controller 14 when leakage tripping; Flow through the drive current If that compares very large breaking coil 6 with the current sinking Ia of the electric-leakage detection circuit 4 that moves all the time, so though be the short time, the loss P1 of the 1st series controller 14 is bigger.
But if compare with the situation of prior art, then owing to do not have the 1st switching regulaor 17 in the prior art, the drive current If of breaking coil 6 directly becomes the load current of the 1st series controller 14, so the loss P1 of the 1st series controller 14 is bigger.
If under the situation of prior art, the output voltage V 2 of the 1st series controller 14 is made as 20V, and obtains its loss P1, then
P1＝(V1-V2)·(Ia+If)
＝(400-20)·(0.001+0.04)
＝15.58W
As noted above; In RCCB of the present invention; Since the loss of the 1st series controller 14 in the time of can reducing leakage tripping significantly, thus can realize the low capacityization of the 1st series controller 14, on the contrary; Can increase the drive current of breaking coil 6, realize the raising of driving force.
Below, the power consumption during to the test action of RCCB describes.
In test action; Through with Test Switchboard 8 closures; Thereby from the output voltage V 3 of the 2nd series controller 14 to test circuit 9 supply powers that generate test signal; By the pulse signal switch driven unit 10 that test circuit 9 is exported, utilize the output voltage V 4 of the 1st switching regulaor 17 to flow through measuring current via 3 winding 3b of limiting resistance 11 in being arranged at zero phase sequence currenttransformer 3.Therefore, the electric power that consumes this moment depends on the current sinking Ii and the measuring current Ij that flows through 3 winding 3b of test circuit 9.
Test circuit 9 is by the small-signal logical constitution; Current sinking Ii is about about 1mA, and is not too big, but measuring current Ij is the analog current of test usefulness itself; The size of required electric current is directly proportional with the specified sensitivity electric current of RCCB, is inversely proportional to the number of turn N of 3 winding 3b.Therefore; Under the situation of zero phase sequence currenttransformer 3 than the winding space that can guarantee 3 windings greatly fully, can suppress measuring current Ij through the number of turn N that increases by 3 winding 3b, but under the situation of using small-sized zero phase sequence currenttransformer 3; Winding space is less; Mostly the number of turn to 3 winding 3b produces restriction, as measuring current Ij, must guarantee the electric current about tens mA that the drive current If with above-mentioned breaking coil 6 is equal to.
Power consumption during for test action describes during with leakage tripping identically.
At first, the output current Ie of the 2nd series controller 16 become electric-leakage detection circuit 4 and test circuit 9 with, therefore
Ie＝Id＝Ia+Ii
In addition because the 1st switching regulaor 17 controls with the mode that begins side by side to stop measuring current with leakage tripping, so the output current Ih of the 1st switching regulaor 17 in the test action equate with measuring current Ij, become Ih=Ij.
Here, if the efficient of the 1st switching regulaor 17 is made as α, then the input current Ig of the 1st switching regulaor 17 by
Ig＝V4/V2/α·Ij
Expression, the loss P3 of the 1st switching regulaor 17 becomes
P3＝(V2-V4)·Ig·(1-α)
＝(V2-V4)·V4/V2/α·Ij·(1-α)
But the drive current If that this formula is equal to the breaking coil in the formula under the situation of leakage tripping 6 is replaced into measuring current Ij.Therefore, if measuring current Ij is set at the level identical with the drive current If of breaking coil 6, then
The loss P3 of the 1st switching regulaor 17 becomes,
P3＝(V2-V4)·V4/V2/α·Ij·(1-α)
＝(40-20)·40/20/0.8·0.04·(1-0.8)
＝0.1W
In addition, for the loss P 1 of the 1st series controller 14, if the current sinking Ii of test circuit 9 is made as 1mA, then
P?1＝(V1-V2)·(Ia+Ii?+V4/V2/α·If)
＝(400-40)·(0.001+0.001+20/40/0.8·0.04)
＝9.75W
P1 becomes corresponding with the current sinking of test circuit 9 and increases slightly, but the loss that roughly is equal to the situation of leakage tripping.
Here, in the test function of existing RCCB, owing to supply with measuring current based on the output voltage V 2 of the 1st series controller 14; So identical ground of the situation during with leakage tripping; If the output voltage V 2 of the 1st series controller 14 is made as 20V, and obtains its loss P1, then
P1＝(V1-V2)·(Ia+Ii+Ij)
＝(400-20)·(0.001+0.001+0.04)
＝15.96W
Thus, when test action, also be that the power consumption of RCCB of the present invention is less.
In addition, for the output voltage V 2 of the 1st series controller 14, voltage is set highly more; Obtain using the effect of the 1st switching regulaor 17 more easily, simultaneously, also can alleviate the burden of the 1st series controller 14; On the contrary, if output voltage V 2 is set at the voltage above 50V, then for smoothing capacitor 15 and the 1st switching regulaor 17; The parts that need selected high resistance to pressure, generation can't use cheapness and the shortcoming of the general small-signal electronic unit that is easy to obtain, in addition; If output voltage V 2 uprises, then the switching voltage of the 1st switching regulaor 17 uprises, and is easy to generate switching noise; Perhaps the switching losses increase makes efficient reduce on the contrary, therefore, preferably output voltage V 2 is set at about 40V.
As noted above; Use the RCCB of the power circuit in the execution mode 1 of the present invention to form, utilize the voltage V2 of the 1st series controller 14 in the middle of temporarily being depressurized to, the circuit that moves to normality; Voltage V2 is utilized the 16 further step-downs of the 2nd series controller and supply power; Circuit for leakage tripping and test action etc. is only moved temporarily utilizes the 17 further step-downs of the 1st switching regulaor and supply power with voltage V2, therefore; Can reduce to realize the miniaturization that power circuit is whole and suppress heating owing to fall the load current that voltage must make the 1st big series controller 14 of power consumption change greatly.
In addition, owing to drive current And if the measuring current Ij for breaking coil 6, the supply capacity of power supply produces more than needed; So the drive current If of coil 6 is increased, improve action force, or measuring current Ij is increased; Reduce the number of turn of 3 winding 3b, suppress cost.
In addition; Owing to there is the problem that produces this switching noise and switching losses in the prior art; So do not use switching regulaor, but as shown in the present, through making 17 actions of the 1st switching regulaor with lower voltage via the 1st series controller 14; Thereby can switch noise inhibiting and switching losses, can improve the efficient of power circuit.
In addition; Through the 1st switching regulaor 17 is only used when abnormal when leakage tripping and the test action etc.; Even thereby suppose that the 1st switching regulaor produces switching noise, also can when circuit breaker moves, temporarily produce through only limiting to, and the baneful influence of noise is suppressed to Min..
Below, according to Fig. 2, execution mode 2 of the present invention is described.Fig. 2 is the circuit diagram that the RCCB of the power circuit in the execution mode 2 is used in expression.
In this execution mode, the loss the during test action of the RCCB that the power circuit shown in the use execution mode 1 is constituted further reduces.In Fig. 2; The 18th, as the 2nd switching regulaor of voltage step-down unit of the low-down voltage of output (for example being less than or equal to 1V), at its input side, through the switch element 10 that moves with the output pulse of test circuit 9; The output voltage V 4 that connects the 1st switching regulaor 17; In addition, its output voltage V 5 constitutes, and makes electric current I k flow through 3 winding 3b of zero phase sequence currenttransformer 3 via limiting resistance 11.
In the example of the RCCB shown in the execution mode 1; In test action, be used for measuring current is set at a large amount of electric power of limiting resistance 11 losses of setting, be improved though compare with existing RCCB; But for test action; Because as long as flow through exciting current to 3 winding 3b, so for the loss of this limiting resistance 11, the efficient of can not saying so height.
Therefore, in this execution mode, for can be in the loss that reduces this limiting resistance 11; Increase is to the exciting current of 3 winding 3b; And utilize the switch element 10 that moves with the output pulse of test circuit 9 with linking, will utilize the 2nd switching regulaor 18 and be depressurized to low-down voltage from the electric current I j that voltage V4 flows out, thus; In the loss that reduces limiting resistance 11, make among 3 winding 3b and flow through bigger exciting current.
In addition, because the 2nd switching regulaor 18 plays the effect that so-called electric current amplifies,, omit limiting resistance 11 in the case so, can use the switching regulaor of constant current output type as the 2nd switching regulaor 18.
In addition; In recent years, being accompanied by popularizing of miniature portable equipment, is center and mass development goes out the DC-DC converter of single-chipization with the equipment less than 5V; And supply with at an easy rate; Therefore, also can the DC-DC converter of this single-chipization be used as the 2nd switching regulaor 18, can expect further miniaturization and high efficiency.
In addition; For the DC-DC converter of this single-chipization, as a rule, the voltage that can import is not high; Under the situation that this DC-DC converter is used as the 2nd switching regulaor 18; Though efficient descends slightly, also can the voltage via switch element 10 inputs be made as the output voltage V 3 of the 1st lower series controller of voltage, and be not voltage V4.
As noted above, through the 2nd switching regulaor 18 is used for the generation of test signal, thereby can expect effects such as following, that is, cut down the maximum load current of the 1st series controller 14, realize the miniaturization of power circuit and cut down the whole current sinking of circuit breaker.
In addition; Because the exciting currents that flow to 3 winding 3b, promptly as measuring current and mobile electric current is amplified significantly, so can reduce the number of turn of 3 winding 3b significantly; Because can be with 3 winding 3b of existing zero phase sequence currenttransformer 3 set inside itself; The number of turn about the outside of zero phase sequence currenttransformer 3 utilizes electric wire according to several circles is provided with, so do not need 3 windings of zero phase sequence currenttransformer 3 inside, can realize that the cost of zero phase sequence currenttransformer 3 reduces and miniaturization.
Below, according to Fig. 3, execution mode 3 of the present invention is described.Fig. 3 is the circuit diagram that the RCCB of the power circuit in the execution mode 3 is used in expression.
In this execution mode, through making the 2nd switching regulaor 18 shown in the execution mode 2 be the constant current output type, thereby the measuring current the during test action that produces RCCB efficiently further reduces loss.
In Fig. 3, the 2nd switching regulaor 18 and execution mode 2 identical ground are the circuit that produce measuring current, but output is to be fixed as the constant current of rated current output, therefore, omits the limiting resistance 11 that is used to limit electric current.In addition; Through improving input voltage; Increase the voltage ratio of input and output, thereby improve the efficient of the 2nd switching regulaor 18, therefore; Make that be the output voltage V 2 of the 1st series controller 14 via switch element 10 to the input voltage of the 2nd switching regulaor 18 inputs, this point is different with execution mode 2.
The 2nd switching regulaor 18 in the execution mode 3 constitutes the buck chopper type switching circuit of auto-excitation type, and it serves as basic with the circuit with following part, that is: switch element Q1; Inductor L1, it is as the output of the 2nd switching regulaor 18; Sustained diode 1 with respect to inductor; And optical coupler PC1, it detects the output level (1evel) as the output of the 2nd switching regulaor 18, carries out FEEDBACK CONTROL to switch element Q1 side.In addition, transistor Q2 and resistance R 2, R3, R4 are used for corresponding with the output of optical coupler PC1 and switch element Q1 are carried out the structure member of the gate circuit of break-make control.
Below, the action of the 2nd switching regulaor 18 in the execution mode 3 is described.Through the switch element 10 that moves with the output pulse of test circuit 9,, supply with the voltage of the output voltage V 2 of the 1st series controller 14 intermittently to the 2nd switching regulaor 18 with the frequency identical with alternating current circuit 1.
Under initial condition; If supply with the voltage of output voltage V 2 to the 2nd switching regulaor 18; Then to transistor Q2, flow through base current from resistance R 4; Transistor Q2 becomes closure state, makes the switch element Q1 of P passage become closure state via resistance R 3, and electric current I k begins to flow to the input side light-emitting diode of the resistance R that is connected in parallel 1, optical coupler PC1 from inductor L1; And mobile to GND via 3 winding 3b of zero phase sequence currenttransformer 3, but electric current I k increases with fixed speed linearity ground owing to the inductance composition of inductor L1.
Here; K is less in electric current I; The voltage of resistance R 1 (promptly; Resistance value * electric current I the k of resistance R 1) than under the little situation of the positive direction voltage VF of the input side light-emitting diode of optical coupler PC1, electric current I k does not flow through the input side light-emitting diode of optical coupler PC1, and the output transistor of optical coupler PC1 is an off-state.
If this electric current I k increases, the voltage of resistance R 1 reaches the positive direction voltage VF of the input side light-emitting diode of optical coupler PC1, and then the part of electric current I k flows through the input side light-emitting diode, and the output transistor of optical coupler PC1 becomes closure state.
If the output transistor of optical coupler PC1 is closed, then transistor Q2 breaks off, and switch element Q1 also becomes off-state, stops to the electric current supply of inductor L1.But therefore electric current I k, though electric current I k reduces with fixed speed, but continues to flow because the inductance of inductor L1 becomes the energy of branch savings and will continue to flow via diode D1.
Owing to reduce at this electric current I k; The voltage of resistance R 1 is than the low moment of positive direction voltage VF of the input side light-emitting diode of optical coupler PC1; The output transistor of optical coupler PC1 recovers off-state; Carry out this action later on repeatedly, so the 2nd switching regulaor 18 moves as electric current I k is maintained the constant current switch adjuster of certain level.In addition, though this switch motion receives the restriction of the response speed of optical coupler PC1, can at random set according to electric current I k and inductor L1; Through switching frequency being set at about higher hundreds of kHz; Thereby can suppress ripple, in addition, can also reduce inductor L1.
It more than is the switch motion principle of the 2nd switching regulaor 18 in the execution mode 3; But in the 2nd switching regulaor 18 in this execution mode 3; Loading section as outlet side only is the resistance R 1 that is connected in parallel, the input side light-emitting diode of optical coupler PC1 and the D.C. resistance part of inductor L; If partly suppress the D.C. resistance of inductor L lower; Then outlet side voltage becomes about the positive direction voltage (approximately 1V) of input side light-emitting diode, therefore, can utilize very simple circuit suppression loss.
In addition; Because the 2nd switching regulaor 18 in the execution mode 3 is very simple circuit; So can constitute by general discrete parts; With utilize that to be less than or equal to 5V with working voltage be that the situation of the above-mentioned single-chip DC-DC converter at center is compared, can set input voltage higher, can obtain bigger output current, be measuring current.
In addition; Execution mode 1 of the invention described above and series controller and the switching regulaor in the execution mode 2; Be usually by the technology of well-known; Series controller is to be connected in series with load and to be connected with the general name of the continuous electric flow pattern constant-voltage DC source circuit that only can carry out voltage step-down of voltage controlled element; Switching regulaor is the general name of the DC stable power supply output voltage controlled with on-off mode, through with semiconductor switch closure/disconnection, thereby input voltage is carried out speed-sensitive switch and output voltage is controlled.
In addition, the chopper-type switching circuit in the execution mode 3 of the invention described above also is usually by the technology of well-known, is the general name of the nonisulated type switching regulaor that is made up of following part, that is: switch element; Inductor, it is as the output of chopper-type switching circuit; Fly-wheel diode with respect to inductor; And feedback circuit; The output level that its output to the chopper-type switching circuit is an inductor detects; And switch element is carried out switch control; In the chopper-type switching circuit, make above-mentioned feedback circuit have suitable sluggishness and time delay and what switch element was directly carried out switch periods control is auto-excitation type chopper-type switching circuit, be the circuit of extensively being known as the basic circuit of Switching Power Supply.
As noted above, execution mode 1 of the present invention and execution mode 2 and execution mode 3 have following technical characterictic point.
Characteristic point 1: have: rectification unit 13, it will be a direct voltage from the AC voltage conversion that AC power 1 is supplied with; The 1st pressure unit 14, its output voltage to this rectification unit carries out step-down; And the 2nd pressure unit 17; The further step-down of its output voltage with above-mentioned the 1st pressure unit, above-mentioned the 1st pressure unit is made up of series controller, in addition; Above-mentioned the 2nd pressure unit is made up of switching regulaor; As the switching regulaor of above-mentioned the 2nd pressure unit, move when only satisfying rated condition abnormal when the action of test circuit 9 test etc., perhaps only when satisfying rated condition abnormal, be connected with 3 winding 3b, limiting resistance 11 even loads; Thereby when non-test etc. during normality, make switch motion become halted state or no-load condition as the switching regulaor of above-mentioned the 2nd pressure unit.
Characteristic point 2: have: rectification circuit 13, it will be direct voltage V1 from the AC voltage conversion that alternating current circuit 1 is supplied with; As the 1st series controller 14 of voltage step-down unit, it temporarily is transformed to the direct voltage V2 as intermediate voltage with direct voltage V1; As the 2nd series controller 16 of voltage step-down unit, it further is depressurized to direct voltage V3 with above-mentioned direct voltage V2, and to the electric-leakage detection circuit supply power that moves all the time; And as the 1st switching regulaor 17 of voltage step-down unit; It further is depressurized to direct voltage V4 with above-mentioned direct voltage V2; The breaking coil 6 of the big electric power of temporary transient consumption and the 3b of test function portion, 10,11 supply powers to move abnormally; Only use switching regulaor 17 when leakage tripping is moved or during test action; During normality when moving and during test action, only utilize series controller 14,16 to guarantee the internal electric source of RCCB 100, the magnitude relationship of above-mentioned direct voltage V1～V4 is made as V1＞V2＞V4＞V3 except leakage tripping.
Characteristic point 3: have: rectification unit 13, it will be a direct voltage from the AC voltage conversion that AC power 1 is supplied with; The 1st pressure unit 14, its output voltage with this rectification unit carries out step-down; And the 2nd pressure unit 17; It will be by the further step-down of output voltage after above-mentioned the 1st pressure unit step-down; Above-mentioned the 1st pressure unit is made up of series controller; Above-mentioned the 2nd pressure unit is made up of switching regulaor, and each output voltage of above-mentioned the 1st pressure unit and above-mentioned the 2nd pressure unit all uses as power supply.
Characteristic point 4: in the power circuit of characteristic point 3; Switching regulaor 17 as above-mentioned the 2nd pressure unit; Through only when satisfying rated condition abnormal, moving; Perhaps only when satisfying rated condition abnormal, be connected, thereby when normality, make switch motion be maintained halted state or no-load condition as the switching regulaor 17 of above-mentioned the 2nd pressure unit with load.
Characteristic point 5: a kind of RCCB, it has: zero phase sequence currenttransformer 3, its leakage current to circuit 1 detects; Electric-leakage detection circuit 4, it is differentiated electric leakage based on the detected signal of above-mentioned zero phase sequence currenttransformer; Tripgear 6,7, it breaks off the switching contact 2 that is arranged in the foregoing circuit according to the output of above-mentioned electric-leakage detection circuit; And the 3b of test function portion, 8,9,10,11; Its function to above-mentioned detection of electrical leakage is tested; In this RCCB, from the power circuit of characteristic point 3 or characteristic point 4 to above-mentioned electric-leakage detection circuit, above-mentioned tripgear and above-mentioned test function portion supply power.
Characteristic point 6: in the RCCB of characteristic point 5, supplying with to the power supply that above-mentioned tripgear 6,7 or the above-mentioned test function 3b of portion, 10,11 carry out, is to carry out through the output voltage as the switching regulaor 17 of above-mentioned the 2nd pressure unit.
Characteristic point 7: in the RCCB of characteristic point 5; Above-mentioned test function portion has: test circuit 9, and it is made up of the oscillating circuit that generates based on the alternating component of above-mentioned alternating current circuit with the approaching frequency of the circuit of the pulse of above-mentioned alternating current circuit same frequency or output and the frequency of above-mentioned alternating current circuit; And the 3rd pressure unit 18; Its pulse signal that above-mentioned test circuit is exported is as input; Be depressurized to the voltage lower than the supply voltage of above-mentioned test circuit, via 3 the winding 3b supply powers of limiting resistance 11 to zero phase sequence currenttransformer 3, above-mentioned the 3rd pressure unit 18 is switching regulaors.
Characteristic point 8: in the RCCB of characteristic point 7, be the switching regulaor of constant current output type as the switching regulaor 18 of above-mentioned the 3rd pressure unit.
Characteristic point 9: in the RCCB of characteristic point 8, constitute as the switching regulaor 18 of above-mentioned the 3rd pressure unit buck chopper type switching circuit, that is: switch element Q1 by the auto-excitation type of using following part at least; Inductor L1, it is as the output of above-mentioned switching regulaor; Sustained diode 1 with respect to above-mentioned inductor L 1; And optical coupler PC1; Its output level to above-mentioned inductor L1 detects; And carry out FEEDBACK CONTROL to above-mentioned switch element Q1 side; In RCCB; Above-mentioned inductor L1 through from the output that becomes above-mentioned buck chopper type switching circuit 18 is connected with the GND level via the input side light-emitting diode of the above-mentioned optical coupler PC1 that is connected in parallel to shunt resistance R1 and 3 winding 3b of zero phase sequence currenttransformer 3, thereby the measuring current Ik that flows through 3 winding 3b of zero phase sequence currenttransformer 3 during with test action is made as the specified amplitude level.
In addition, for the present invention, can suitably be out of shape, omit each execution mode within the scope of the invention.
In addition, in each figure, same numeral is represented identical or suitable part.
Claims (9)
1. power circuit is characterized in that having:
Rectification unit, it will be direct voltage from the AC voltage conversion that AC power is supplied with; The 1st pressure unit, its output voltage with this rectification unit carries out step-down; And the 2nd pressure unit; It will be by the further step-down of output voltage after said the 1st pressure unit step-down; Said the 1st pressure unit is made up of series controller; Said the 2nd pressure unit is made up of switching regulaor, and each output voltage of said the 1st pressure unit and said the 2nd pressure unit all uses as power supply.
2. power circuit according to claim 1 is characterized in that,
Switching regulaor as said the 2nd pressure unit; Through only when satisfying rated condition abnormal, moving; Perhaps only when satisfying rated condition abnormal, be connected with load; Thereby when normality, make switch motion be maintained halted state or no-load condition as the switching regulaor of said the 2nd pressure unit.
3. RCCB is characterized in that having:
Zero phase sequence currenttransformer, its leakage current to circuit detects; Electric-leakage detection circuit, it is differentiated electric leakage based on the detected signal of said zero phase sequence currenttransformer; Tripgear, it breaks off the switching contact that is arranged in the said circuit according to the output of said electric-leakage detection circuit; And test function portion, its function to said detection of electrical leakage is tested, and in this RCCB, accessory rights requires 1 or 2 described power circuits to said electric-leakage detection circuit, said tripgear and said test function portion supply power.
4. RCCB according to claim 3 is characterized in that,
Power supply to said tripgear or said test function portion carry out is supplied with, and is to carry out through the output voltage as the switching regulaor of said the 2nd pressure unit.
5. RCCB according to claim 3 is characterized in that,
Said test function portion has: test circuit, and it is made up of the oscillating circuit that generates based on the alternating component of said alternating current circuit with the approaching frequency of the circuit of the pulse of said alternating current circuit same frequency or output and the frequency of said alternating current circuit; And the 3rd pressure unit, its pulse signal that said test circuit is exported is depressurized to the voltage lower than the supply voltage of said test circuit as input, and said the 3rd pressure unit is a switching regulaor.
6. RCCB according to claim 5 is characterized in that,
Switching regulaor as said the 3rd pressure unit is the switching regulaor of constant current output type.
7. RCCB according to claim 3 is characterized in that,
Said test function portion has: test circuit, and it is made up of the oscillating circuit that generates based on the alternating component of said alternating current circuit with the approaching frequency of the circuit of the pulse of said alternating current circuit same frequency or output and the frequency of said alternating current circuit; And the 3rd pressure unit; Its pulse signal that said test circuit is exported is as input; Be depressurized to the voltage lower than the supply voltage of said test circuit, via 3 the winding supply powers of limiting resistance to zero phase sequence currenttransformer, said the 3rd pressure unit is a switching regulaor.
8. RCCB is characterized in that having:
Rectification circuit, it will be direct voltage V1 from the AC voltage conversion that alternating current circuit is supplied with; As the 1st series controller of voltage step-down unit, it is transformed to the direct voltage V2 as intermediate voltage with said direct voltage V1; As the 2nd series controller of voltage step-down unit, it further is depressurized to direct voltage V3 with said direct voltage V2, and to the electric-leakage detection circuit supply power that moves all the time; And as the switching regulaor of voltage step-down unit; It further is depressurized to direct voltage V4 with said direct voltage V2; Temporary transient breaking coil and the test function portion supply power that consumes big electric power to move abnormally; Only use said switching regulaor when leakage tripping is moved or during test action; During normality when moving and during test action, only utilize the said the 1st and the 2nd series controller to guarantee internal electric source, the magnitude relationship of said direct voltage V1～V4 is made as V1＞V2＞V4＞V3 except leakage tripping.
9. RCCB according to claim 6 is characterized in that,
Constitute as the switching regulaor of said the 3rd pressure unit buck chopper type switching circuit, that is: switch element by the auto-excitation type that has following part at least; Inductor, it is as the output of said switching regulaor; And optical coupler, its output level to said inductor detects, and carries out FEEDBACK CONTROL to the switch element side,
Through said inductor from the output that becomes said buck chopper type switching circuit; Be connected with the GND level via the input side light-emitting diode of said optical coupler and 3 windings of said zero phase sequence currenttransformer; Thereby the measuring current that flows through 3 windings of zero phase sequence currenttransformer during with test action is made as the specified amplitude level; Wherein, said input side light-emitting diode and shunt resistance are connected in parallel.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| JP2011099284 | 2011-04-27 | ||
| JP2011-099284 | 2011-04-27 | ||
| JP2011-258547 | 2011-11-28 | ||
| JP2011258547A JP5832254B2 (en) | 2011-04-27 | 2011-11-28 | Power supply circuit and earth leakage circuit breaker using the power supply circuit |
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| CN102761272A true CN102761272A (en) | 2012-10-31 |
| CN102761272B CN102761272B (en) | 2016-08-10 |
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| CN201210080552.9A Expired - Fee Related CN102761272B (en) | 2011-04-27 | 2012-03-23 | Power circuit and use the RCCB of this power circuit |
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| KR (1) | KR101348526B1 (en) |
| CN (1) | CN102761272B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348134A (en) * | 2013-08-01 | 2015-02-11 | 三菱电机株式会社 | Residual-current circuit breaker |
| CN107276024A (en) * | 2017-08-17 | 2017-10-20 | 北京志远鸿通科技有限公司 | One kind electric leakage monitoring device |
| CN107290660A (en) * | 2017-08-01 | 2017-10-24 | 浙江方圆电气设备检测有限公司 | A kind of miniature circuit breaker detecting system |
| CN107332201A (en) * | 2017-08-23 | 2017-11-07 | 浙江夏兴电子科技股份有限公司 | One kind is applied to three-phase circuit simulated leakage current generating circuit |
| CN109196746A (en) * | 2016-05-17 | 2019-01-11 | 三菱电机株式会社 | Leakage circuit breakers |
| CN109328305A (en) * | 2016-07-12 | 2019-02-12 | 日置电机株式会社 | Measurement device |
| CN112969980A (en) * | 2018-11-05 | 2021-06-15 | 三菱电机株式会社 | Power supply circuit |
| WO2023143527A1 (en) * | 2022-01-28 | 2023-08-03 | 浙江白马科技有限公司 | Power supply management circuit, function module, autonomous operation device and control system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4893228A (en) * | 1987-09-01 | 1990-01-09 | Hewlett Packard Company | High-efficiency programmable power supply |
| CN1612459A (en) * | 2003-10-29 | 2005-05-04 | 富士电机机器制御株式会社 | DC power supply circuit and leakage breaker using same |
| CN1757147A (en) * | 2003-02-03 | 2006-04-05 | 莱维顿制造有限公司 | Circuit interrupting device with single throw, double mode button for test-reset function |
| CN101227075A (en) * | 2008-02-02 | 2008-07-23 | 佛山市南电开关有限公司 | Low-voltage breaker with high voltage open-phase protection |
| CN101404405A (en) * | 2007-10-03 | 2009-04-08 | 三菱电机株式会社 | Creepage breaker |
| CN101409508A (en) * | 2007-10-09 | 2009-04-15 | 三菱电机株式会社 | Power circuit and leakage breaker using the same |
| US20100225240A1 (en) * | 2009-03-06 | 2010-09-09 | Lutron Electronics Co., Inc. | Multi-Stage Power Supply For a Load Control Device Having a Low-Power Mode |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007299838A (en) | 2006-04-28 | 2007-11-15 | Hitachi Metals Ltd | Magnetic core for current transformer, current transformer using same, and electric power meter |
| KR100956162B1 (en) | 2009-06-19 | 2010-05-06 | 주식회사 헤코 | Combo type a circuit breaker and method thereof |
-
2012
- 2012-03-15 KR KR1020120026418A patent/KR101348526B1/en active IP Right Grant
- 2012-03-23 CN CN201210080552.9A patent/CN102761272B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4893228A (en) * | 1987-09-01 | 1990-01-09 | Hewlett Packard Company | High-efficiency programmable power supply |
| CN1757147A (en) * | 2003-02-03 | 2006-04-05 | 莱维顿制造有限公司 | Circuit interrupting device with single throw, double mode button for test-reset function |
| CN1612459A (en) * | 2003-10-29 | 2005-05-04 | 富士电机机器制御株式会社 | DC power supply circuit and leakage breaker using same |
| CN101404405A (en) * | 2007-10-03 | 2009-04-08 | 三菱电机株式会社 | Creepage breaker |
| CN101409508A (en) * | 2007-10-09 | 2009-04-15 | 三菱电机株式会社 | Power circuit and leakage breaker using the same |
| CN101227075A (en) * | 2008-02-02 | 2008-07-23 | 佛山市南电开关有限公司 | Low-voltage breaker with high voltage open-phase protection |
| US20100225240A1 (en) * | 2009-03-06 | 2010-09-09 | Lutron Electronics Co., Inc. | Multi-Stage Power Supply For a Load Control Device Having a Low-Power Mode |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348134B (en) * | 2013-08-01 | 2017-07-18 | 三菱电机株式会社 | Rccb |
| CN104348134A (en) * | 2013-08-01 | 2015-02-11 | 三菱电机株式会社 | Residual-current circuit breaker |
| CN109196746A (en) * | 2016-05-17 | 2019-01-11 | 三菱电机株式会社 | Leakage circuit breakers |
| CN109196746B (en) * | 2016-05-17 | 2020-07-07 | 三菱电机株式会社 | Earth leakage circuit breaker |
| US10928428B2 (en) | 2016-07-12 | 2021-02-23 | Hioki Denki Kabushiki Kaisha | Measuring apparatus |
| CN109328305A (en) * | 2016-07-12 | 2019-02-12 | 日置电机株式会社 | Measurement device |
| CN109328305B (en) * | 2016-07-12 | 2021-06-15 | 日置电机株式会社 | Measuring apparatus |
| CN107290660A (en) * | 2017-08-01 | 2017-10-24 | 浙江方圆电气设备检测有限公司 | A kind of miniature circuit breaker detecting system |
| CN107276024B (en) * | 2017-08-17 | 2018-08-10 | 北京志远鸿通科技有限公司 | A kind of electric leakage monitoring device |
| CN107276024A (en) * | 2017-08-17 | 2017-10-20 | 北京志远鸿通科技有限公司 | One kind electric leakage monitoring device |
| CN107332201A (en) * | 2017-08-23 | 2017-11-07 | 浙江夏兴电子科技股份有限公司 | One kind is applied to three-phase circuit simulated leakage current generating circuit |
| CN112969980A (en) * | 2018-11-05 | 2021-06-15 | 三菱电机株式会社 | Power supply circuit |
| WO2023143527A1 (en) * | 2022-01-28 | 2023-08-03 | 浙江白马科技有限公司 | Power supply management circuit, function module, autonomous operation device and control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102761272B (en) | 2016-08-10 |
| KR20120121827A (en) | 2012-11-06 |
| KR101348526B1 (en) | 2014-01-06 |
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