CN109541287A - A kind of leak current detection device - Google Patents
A kind of leak current detection device Download PDFInfo
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- CN109541287A CN109541287A CN201811632339.8A CN201811632339A CN109541287A CN 109541287 A CN109541287 A CN 109541287A CN 201811632339 A CN201811632339 A CN 201811632339A CN 109541287 A CN109541287 A CN 109541287A
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Classifications
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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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- 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
Abstract
The embodiment of the invention discloses a kind of leak current detection devices, include: the secondary windings centre tap of isolating transformer, thermistor PTC, leakage current sampling resistor R2, adjust resistance R1, two-way transient state inhibits pipe TVS, filter capacitor C1 and two-way optocoupler U1, the two-way transient state inhibits the first end of pipe TVS to be electrically connected with the secondary windings centre tap of isolating transformer, and the two-way transient state inhibits being connected in series and being grounded with thermistor for pipe TVS.The adjusting resistance R1 is in parallel with the two-way transient state inhibition pipe TVS after connecting with current sampling resistor R2, the second end of the filter capacitor C1 is electrically connected with the second end of the current sampling resistor R2, the two-way optocoupler U1 primary side is connected in parallel with the filter capacitor C1, and the secondary side of the two-way optocoupler U1 generates detection signal.The advantages of with low in cost, scheme is simple, few using device, and scheme is simple, high reliablity.
Description
Technical field
The present invention relates to elevator technology field more particularly to a kind of leak current detection devices.
Background technique
On the one hand at present in many old elevators, since band-type brake coil is too long using the time, the reasons such as coil aging cause
Insulating properties function reduction, it is possible that the phenomenon of the failure that coil leaks electricity to the earth PE；And it is returned when leakage current does not reach band-type brake
When the control air switch action current on road (general 30mA, or control air switch failure), control air switch does not trip, meeting
It further results in elevator and drags lock operation or car slipping, generate security risk.
Fig. 1 is elevator internal contracting brake power circuit schematic diagram in the prior art.With reference to Fig. 1, existing band-type brake power circuit 100 is wrapped
Include band-type brake power circuit 11, continuous current circuit 12, band-type brake coil 13.When normal work, when 13 somewhere of band-type brake coil (such as M point) occurs
When to the earth PE electric leakage (when electric leakage, dotted line becomes solid line in figure), when the control air that leakage current does not reach brake loop is opened
When closing action current or when control air switch failure does not trip.Electric current will be uneven on 2 coils of band-type brake coil, such as
The exchange upper half period: only having M point top half coil to have an electric current on L2, such working method will result in band-type brake coil L1,
L2 is asynchronous, i.e. in an ac cycle, when L1 is worked by two wave electric currents, and the work of L2 only a fraction.When elevator is transported
When row, it will lead to elevator and lock dragged to run；And when elevator stopping, L2 causes without continuous current circuit and when passing through leakage point of electricity afterflow
Band-type brake opens minim gap and makes elevator that car slipping risk occur.Therefore need a kind of detection circuit and inspection that can be solved the above problems
Survey method, since the existing detection method in market all detects the electric current between band-type brake coil and the earth by Hall sensor substantially
And voltage signal is converted to realize, method is complicated, and at high cost.
Summary of the invention
In view of this, to provide one kind, cost is relatively low and examines the embodiment of the invention provides a kind of leak current detection device
Survey lower-cost leak current detection device.
Correspondingly, the embodiment of the invention provides a kind of leak current detection devices, comprising: thermistor PTC, leakage current are adopted
Sample resistance R2, resistance R1 is adjusted, two-way transient state inhibits pipe TVS, filter capacitor C1 and two-way optocoupler U1, and the two-way transient state inhibits
The first end of pipe TVS is electrically connected with the secondary windings centre tap of isolating transformer, and the two-way transient state inhibits the second of pipe TVS
End is electrically connected with the first end with thermistor PTC, the second end ground connection of the thermistor PTC, the adjusting resistance
The first end of RI inhibits the first end of pipe TVS be electrically connected with the two-way transient state, the second end of the adjusting resistance RI with it is described
The first end of leakage current sampling resistor is electrically connected, the second end of the leakage current sampling resistor and the second end of the thermistor
Electrical connection, the first end of the filter capacitor C1 are electrically connected with the first end of the current sampling resistor R2, the filter capacitor
The second end of C1 is electrically connected with the second end of the current sampling resistor R2, the two-way optocoupler U1 primary side and the filter capacitor
C1 is connected in parallel, and the secondary side of the two-way optocoupler U1 generates detection signal.
Further, the leak current detection device further include:
Power supply output control unit, the power supply output control unit are electrically connected with the secondary side of the two-way optocoupler U1, institute
State the on-off of detection signal control power supply of the power supply output control unit for generating according to the secondary side of the two-way optocoupler U1.
Further, the power supply output control unit, comprising:
Triggering level signal power source, for providing the high level signal of triggering single-chip microcontroller response；
Filter unit, including resistance R3 and capacitor, the first end of the resistance R3 and triggering level signal power source electricity
Connection, the second end of the resistance R3 are electrically connected with the first end of the capacitor, the second end ground connection of the capacitor, the resistance
The second end of R3 is electrically connected with the I/O port of the single-chip microcontroller；
The first end on the secondary side of the two-way optocoupler U1 is electrically connected with the second end of the resistance R3, the two-way optocoupler U1
The second end on secondary side be electrically connected with the second end of the capacitor.
Further, the single-chip microcontroller is AT89C52 chip.
Further, it is SMBJ16CA-E3/52TVS that the two-way transient state, which inhibits pipe TVS,.
Further, the two-way optocoupler U1 model K3010.
Leak current detection device provided in an embodiment of the present invention converts voltage signal for leakage current by sampling resistor,
Two-way optocoupler can be generated and detect signal accordingly to voltage signal by (detection).Adjusting resistance by setting can detecte
Band-type brake coil leaks electricity to the earth PE and leakage current does not reach elevator caused by the control air switch action value of brake loop
The problem of dragging lock operation or car slipping.The output of integrated power supply Switching Power Supply can also be solved simultaneously due to aging circuit, out
Existing Switching Power Supply exports Leaked Current of Line to Ground, makes output voltage decline or fluctuation extremely, causes the abnormal problem of elevator control functions.
Compared with prior art, leak current detection device provided in an embodiment of the present invention is low in cost, and scheme is simple, few using device,
Scheme is simple, high reliablity.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, of the invention other
Feature, objects and advantages will become more apparent upon:
Fig. 1 is the circuit diagram of band-type brake power supply in the prior art；
Fig. 2 is the circuit diagram for the leak current detection device that the embodiment of the present invention one provides；
Fig. 3 is the leakage current flow graph for the leak current detection device that the embodiment of the present invention one provides；
Fig. 4 is the circuit diagram of leak current detection device provided by Embodiment 2 of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
Embodiment one
Fig. 2 is the circuit diagram of leak current detection device provided in an embodiment of the present invention.Referring to fig. 2, institute's leakage current is examined
Survey device, comprising: the secondary windings centre tap of isolating transformer (is also possible to the non-isolated output inductor opened up and mend structure
Centre goes out tap), thermistor PTC, leakage current sampling resistor R2, adjust resistance R1, two-way transient state inhibits pipe TVS, filtered electrical
Hold C1 and two-way optocoupler U1, the two-way transient state inhibits the first end of pipe TVS and the secondary windings centre tap of isolating transformer
Electrical connection, the two-way transient state inhibit the second end of pipe TVS to be electrically connected with the first end with thermistor PTC, the heat
The second end of quick resistance PTC is grounded, and the first end for adjusting resistance RI and the two-way transient state inhibit the first end of pipe TVS electric
Connection, the second end for adjusting resistance RI are electrically connected with the first end of the leakage current sampling resistor, the leakage current sampling
The second end of resistance is electrically connected with the second end of the thermistor, the first end of the filter capacitor C1 and the current sample
The first end of resistance R2 is electrically connected, and the second end of the filter capacitor C1 and the second end of the current sampling resistor R2 are electrically connected
It connects, the two-way optocoupler U1 primary side is connected in parallel with the filter capacitor C1, and the secondary side of the two-way optocoupler U1 generates detection letter
Number.
Power circuit is shown in Fig. 1, as seen from Figure 1, the power circuit 200 includes input ACDC conversion circuit
21, main topological circuit 22 and output leakage current detection protection circuit 23.The input ACDC conversion circuit 21, main topology
Circuit 22 works together provides energy for band-type brake (or Switching Power Supply load), wherein the main topological circuit 22 diagram is depicted as
Double tube positive exciting, the power circuit its be also possible to the basic DCDC transformation of the power electronics such as normal shock, flyback, phase shift bridge, LLC resonance and open up
It flutters.
A point one end need to connect the secondary windings in main topological 22 isolating transformer in the output leakage current detection device
On centre tap, the A point other end is connected with described adjusting one end resistance R1 and the two-way transient state inhibits the one of pipe TVS
End is connected, and the other end for adjusting resistance R1 is connected with the sampling resistor R2, the other end and B point of the sampling resistor R2
Be connected, the sampling resistor R2 is in parallel with the primary side of the filter capacitor C1 and the two-way optocoupler U1, the B point with it is described
Two-way transient state inhibits the other end of pipe TVS and one end of the thermistor PTC to be connected, and the thermistor PTC's is another
Terminate the earth PE.Wherein, the effect of the thermistor PTC is that current limliting is carried out when output earth short circuit；The sampling resistor
The effect of R2 is to convert voltage signal for leakage current signal；The effect for adjusting resistance R1 is to adjust residual current protection electric current
Size；It is to prevent electric leakage moment very high output voltage to be applied directly to adopt that the two-way transient state, which inhibits the effect of pipe TVS,
On sample resistance R1, while auxiliary adjustment residual current protection size of current；The effect of the filter capacitor C1 is filtering interference signals,
With false action-proof；The effect of the two-way optocoupler U1 is to convert and export detection signal, illustratively, can be in the bi-directional light
One indicator light of secondary side series connection of coupling U1 can light prompt work people by indicator light when detecting to the earth PE electric leakage
Member closes power supply, avoids causing danger.
Fig. 3 is the leakage current flow graph for the leak current detection device that the embodiment of the present invention one provides, referring to fig. 2, normal
When work, when it is described output leak electricity over the ground when, such as it is described export+leak electricity to the earth PE, there will be electric leakages to flow through
Cross DC+ → PE → R2 → R1 → isolating transformer secondary windings centre tap forming circuit；The sampling resistor R2 will
Leakage current is converted to voltage signal, since the parallel shunt of the series connection partial pressure and the TVS pipe for adjusting resistance R1 acts on,
When leakage current reaches (or being more than) some setting value threshold value, the voltage signal of the sampling resistor R2 makes the two-way optocoupler
U1 conducting, leakage current signal conversion processes are detection signal at this time, and the output control circuit U2 recognition detection signal is to go
Shutdown output, residual current protection function action are worked；When leakage current is lower than the setting value threshold value, the sampling resistor R2
Voltage signal it is too low make the two-way optocoupler U1 cut-off, the output control circuit U2 recognition detection signal makes the collection at this time
It can continue normally to export at power supply, residual current protection functional reduction.
Optionally, the residual current protection threshold value can pass through the adjusting resistance R1, the sampling resistor R2, described couple
Pipe TVS is inhibited to be configured adjusting to transient state, such as the adjusting resistance R1 resistance value is 3k, the sampling resistor R2 resistance value is
510 Ω, the two-way transient state inhibit pipe TVS model SMBJ16CA-E3/52, the two-way optocoupler U1 model K3010, then
Residual current protection threshold value is 3mA；Changing the adjusting resistance R1 resistance value in this case is 11k, then residual current protection threshold value
It will be increased to 15mA.
Leak current detection device provided in an embodiment of the present invention converts voltage signal for leakage current by sampling resistor,
Voltage signal can be passed through, generate two-way optocoupler and detect signal accordingly.Adjusting resistance by setting can detecte band-type brake line
Circle leaks electricity to the earth PE and leakage current does not have elevator caused by the control air switch action value for reaching brake loop to drag
The problem of lock operation or car slipping.The output of integrated power supply Switching Power Supply can also be solved simultaneously due to aging circuit, switched
Power supply exports Leaked Current of Line to Ground, makes output voltage decline or fluctuation extremely, causes the abnormal problem of elevator control functions.With it is existing
Technology is compared, and leak current detection device provided in an embodiment of the present invention is low in cost, and scheme is simple, few using device, scheme letter
It is single, high reliablity.
Embodiment two
Fig. 4 is the circuit diagram of leak current detection device provided by Embodiment 2 of the present invention.The present embodiment is with above-mentioned reality
It applies and optimizes based on example.Specifically, the leak current detection device of stating can also increase: power supply output control unit, it is described
Power supply output control unit is electrically connected with the secondary side of the two-way optocoupler U1, and the power supply output control unit is used for according to
The on-off for the detection signal control power supply that the secondary side of two-way optocoupler U1 generates.
Export detection of electrical leakage signal in time when detecting that integrated power supply output leaks electricity to the earth PE to control integrated power supply
Output, can be when integrated power supply band-type brake output par, c be leaked electricity, through control integrated power supply output, so that elevator stopping is dynamic
Make, to prevent elevator from dragging lock operation or the problem of car slipping；On the other hand it is defeated also to can solve integrated power supply Switching Power Supply
Out due to aging circuit, there is Switching Power Supply output Leaked Current of Line to Ground, makes output voltage decline or fluctuation extremely, cause elevator controlling
The abnormal problem of function.
Therefore, in the present embodiment, the leak current detection device can also include: power supply output control unit, with root
The detection signal that the leak current detection device provided according to embodiment one generates controls power supply.
Illustratively, the power supply output control unit, comprising:
Triggering level signal power source, for providing the high level signal of triggering single-chip microcontroller response；
Filter unit, including resistance R3 and capacitor, the first end of the resistance R3 and triggering level signal power source electricity
Connection, the second end of the resistance R3 are electrically connected with the first end of the capacitor, the second end ground connection of the capacitor, the resistance
The second end of R3 is electrically connected with the I/O port of the single-chip microcontroller；
The first end on the secondary side of the two-way optocoupler U1 is electrically connected with the second end of the resistance R3, the two-way optocoupler U1
The second end on secondary side be electrically connected with the second end of the capacitor.
Illustratively, the single-chip microcontroller is AT89C52 chip, and the triggering level signal power source can be 3.3V power supply,
So that the I/O interface of the single-chip microcontroller can receive the high or low level signal of triggering respective action.
Below with reference to the course of work of power supply output control unit in leak current detection device provided in this embodiment
The power supply output control unit course of work is described.When the secondary side of the two-way optocoupler U1 does not generate detection signal, due to
Capacitor exists, and can not constitute circuit between triggering level signal power source and ground connection.The potential of I/O port and resistance R3 second end in Fig. 4
Equipotential, since circuit can not be constituted between triggering level signal power source and ground connection, that is, the potential of I/O port and triggering electricity
Flat signal power source equipotential.I.e. I/O port receives high level signal at this time, at this point, single-chip microcontroller does not receive trigger signal.It is described
When the secondary side of two-way optocoupler U1 generates detection signal, that is, in Fig. 43 and 4 between be connected, triggering level signal power source is logical
It crosses resistance R3 and 4,3 points constitutes a circuit with the earth.Since R3 has partial pressure effect, potential and resistance R3 at IO
Second end equipotential, resistance R3 second end potential are 0.Therefore, I/O port receives low level signal, at this point, single-chip microcontroller receives
Low level trigger signal carries out conducting control to power supply, cuts off integrated power supply, so that elevator stopping acts, avoids generating danger
Dangerous accident.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (6)
1. a kind of leak current detection device characterized by comprising secondary windings centre tap, the temperature-sensitive electricity of isolating transformer
It hinders PTC, leakage current sampling resistor R2, adjust resistance R1, two-way transient state inhibits pipe TVS, filter capacitor C1 and two-way optocoupler U1, institute
Stating two-way transient state inhibits the first end of pipe TVS to be electrically connected with the secondary windings centre tap of isolating transformer, the two-way transient state
The second end of pipe TVS is inhibited to be electrically connected with the first end with thermistor PTC, the second termination of the thermistor PTC
Ground, the first end for adjusting resistance R1 inhibit the first end of pipe TVS to be electrically connected with the two-way transient state, the adjusting resistance R1
Second end be electrically connected with the first end of the leakage current sampling resistor, the second end of the leakage current sampling resistor and the heat
The second end of quick resistance is electrically connected, and the first end of the filter capacitor C1 and the first end of the current sampling resistor R2 are electrically connected
It connects, the second end of the filter capacitor C1 is electrically connected with the second end of the current sampling resistor R2, and the two-way optocoupler U1 is former
Side is connected in parallel with the filter capacitor C1, and the secondary side of the two-way optocoupler U1 generates detection signal.
2. leak current detection device according to claim 1, which is characterized in that the leak current detection device further include:
Power supply output control unit, the power supply output control unit are electrically connected with the secondary side of the two-way optocoupler U1, the electricity
The on-off for the detection signal control power supply that source output control unit is used to be generated according to the secondary side of the two-way optocoupler U1.
3. leak current detection device according to claim 2, which is characterized in that the power supply output control unit, comprising:
Triggering level signal power source, for providing the high level signal of triggering single-chip microcontroller response；
Filter unit, including resistance R3 and capacitor, the first end of the resistance R3 are electrically connected with the triggering level signal power source,
The second end of the resistance R3 is electrically connected with the first end of the capacitor, the second end ground connection of the capacitor, the resistance R3's
Second end is electrically connected with the I/O port of the single-chip microcontroller；
The first end on the secondary side of the two-way optocoupler U1 is electrically connected with the second end of the resistance R3, the pair of the two-way optocoupler U1
The second end on side is electrically connected with the second end of the capacitor.
4. leak current detection device according to claim 1, which is characterized in that the single-chip microcontroller is AT89C52 chip.
5. leak current detection device according to claim 1, which is characterized in that the two-way transient state inhibits the pipe TVS to be
SMBJ16CA-E3/52TVS。
6. leak current detection device according to claim 1, which is characterized in that the two-way optocoupler U1 model K3010.
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| CN201811632339.8A CN109541287A (en) | 2018-12-29 | 2018-12-29 | A kind of leak current detection device |
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Cited By (2)
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| CN113820625A (en) * | 2021-10-13 | 2021-12-21 | 上海电气泰雷兹交通自动化系统有限公司 | Circuit for detecting leakage current of alternating current solid-state relay |
| CN113848366A (en) * | 2021-08-10 | 2021-12-28 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
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| CN105811366A (en) * | 2016-03-11 | 2016-07-27 | 深圳威迈斯电源有限公司 | Remote power supply earth leakage protection circuit |
| CN106058837A (en) * | 2016-07-19 | 2016-10-26 | 电子科技大学 | Line arrester leakage current detection device without isolation component |
| CN209992563U (en) * | 2018-12-29 | 2020-01-24 | 天津康途科技有限公司 | Leakage current detection device |
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