CN107769159A - A kind of earth leakage protective device, electrical leakage detecting method and a kind of charging equipment - Google Patents
A kind of earth leakage protective device, electrical leakage detecting method and a kind of charging equipment Download PDFInfo
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- CN107769159A CN107769159A CN201711012135.XA CN201711012135A CN107769159A CN 107769159 A CN107769159 A CN 107769159A CN 201711012135 A CN201711012135 A CN 201711012135A CN 107769159 A CN107769159 A CN 107769159A
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000001681 protective effect Effects 0.000 title claims abstract description 37
- 230000005611 electricity Effects 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000000630 rising effect Effects 0.000 claims description 5
- 230000001960 triggered effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses earth leakage protective device, electrical leakage detecting method and a kind of charging equipment, wherein the earth leakage protective device includes：Current sensor and sample circuit；Electric leakage signal process chip；Coil, it is wrapped on current sensor；Gate-controlled switch, it is connected in electric power loop；Control module, for controlling gate-controlled switch to be turned on or off；The first input end of control module is connected with electric leakage signal process chip, judges whether to leak electricity according to leakage control signal；The first output end, the second output end of control module are connected with the both ends of coil respectively, and alternating current or pulse current are produced in control coil, and control gate-controlled switch switching-on by disconnecting when judged result is leaks electricity.It can detect whether current sensor, sample circuit, electric leakage signal process chip failure occur by the present invention, start normal detection of electrical leakage process again in no failure, result is more accurate so as to ensure to leak electricity, and in time current supply circuit can be controlled to disconnect.
Description
Technical field
The present invention relates to electric leakage protection technology field, and in particular to a kind of earth leakage protective device, electrical leakage detecting method and one
Kind charging equipment.
Background technology
Charging equipment (such as charging pile, charging gun, charger etc.), which leaks electricity, not only endangers the personal safety of people, can also be to filling
The stability of power network impacts where electric equipment.
Chinese patent literature (A of CN 106711937) discloses a kind of alternating-current charging pile A type leakage protection circuits, such as Fig. 1
It is shown, leakage current signal is converted into by drain voltage signal by zero sequence current mutual inductor and sample circuit；Electric leakage main control module is sentenced
Whether disconnected electrical leakage voltage is more than representative value；When more than when, the main control module that leaks electricity electric leakage main control chip triggering controlled silicon conducting, hair
Electric leakage signal is sent to relay driving module；Relay driving module according to from power control module control instruction control after
Electrical equipment is turned on and off, and relay is closed when receiving out code, and electric leakage signal is fed back into power control module.
If however, at least one of current sensor, sample circuit, electric leakage main control chip in above-mentioned leakage protection circuit
Break down, leakage protection circuit all can not can in time control current supply circuit to disconnect because detection of electrical leakage result is inaccurate, cause
Potential safety hazard.
The content of the invention
In view of this, the embodiments of the invention provide a kind of earth leakage protective device, electrical leakage detecting method and a kind of charging to set
Standby, to solve existing leakage protection circuit, to draw detection of electrical leakage result inaccurate and can not control what current supply circuit disconnected to ask in time
Topic.
First aspect present invention provides a kind of earth leakage protective device, including：Current sensor and sample circuit, for inciting somebody to action
Leakage current signal is converted to drain voltage signal；The current sensor passes through power line；Electric leakage signal process chip, for basis
The drain voltage signal output leakage control signal；Coil, it is wrapped on the current sensor；Gate-controlled switch, it is connected on electricity
In resource loop, for controlling the electric power loop to be turned on or off；Control module, for controlling the gate-controlled switch to lead on-off
Open；The first input end of the control module is connected with the electric leakage signal process chip, and the control module is according to the leakage
Electric control signal judges whether to leak electricity；First output end of the control module, the second output end respectively with the coil two
End connection, the control module control and alternating current or pulse current are produced in the coil, and when judged result is electric leakage
When control the gate-controlled switch by the switching-on state of off-state.
Alternatively, described device also includes：Gate-controlled switch, it is connected with the control module, for according to the control mould
The control signal control electric power loop of block output is turned on or off.
Alternatively, described device also includes：The control terminal of the gate-controlled switch connects positive electricity by the first triode respectively
Pressure, negative voltage, the base stage of two first triodes are connected with the output end of the control module.
Alternatively, the first end of the gate-controlled switch control terminal by the first PNP triode connect positive voltage, described first
The base stage of PNP triode is connected with the colelctor electrode of the first NPN triode；The grounded emitter of first NPN triode, base stage
It is connected with first output end of the control module.
Alternatively, the second end of the gate-controlled switch control terminal by the second NPN triode connect negative voltage, described second
The base stage of NPN triode is connected with the colelctor electrode of the second PNP triode；The emitter stage of second PNP triode connects positive voltage,
Base stage is connected with second output end of the control module.
Alternatively, the first end of the coil is connected to voltage source by first resistor, and the second end of the coil passes through
Second resistance is connected to the voltage source；The colelctor electrode of 3rd NPN triode is connected to the first end of the coil and described the
Between one resistance, grounded emitter, base stage is connected with the output end of the control module；The colelctor electrode of 4th NPN triode connects
It is connected between the second end of the coil and the second resistance, grounded emitter, the output end of base stage and the control module
Connection.
Alternatively, the control module includes：Double D trigger and processor；The output of the electric leakage signal process chip
End with it is following at least one be connected：The directset terminal of the double D trigger, directreset terminal, input end of clock, data input
End；The input of the processor and/or output end with it is following at least one be connected：The directset terminal of the double D trigger,
Directreset terminal, input end of clock, data input pin；At least one output end of the double D trigger and the gate-controlled switch
Control terminal connection；The output end signal of the electric leakage signal process chip and the output signal of the processor pass through institute respectively
Stating double D trigger controls the gate-controlled switch to be turned on or off；When the output end signal of the electric leakage signal process chip passes through
When the double D trigger controls the gate-controlled switch conducting or the when of disconnection, the output that the processor passes through the double D trigger
End signal obtains the control signal for putting on the gate-controlled switch.
Alternatively, the double D trigger triggers for rising edge, and directset terminal and directreset terminal are that high level is effective；
Also, the first directset terminal, second clock input and the output of the electric leakage signal process chip of the double D trigger
End connection；First data input pin of the double D trigger, the first output end of the second directset terminal and the processor connect
Connect, and be grounded simultaneously；The first input end of clock, the second directreset terminal and the second of the processor of the double D trigger
Output end connects, and connects power supply simultaneously；First directreset terminal of the double D trigger, the second data input pin ground connection；It is described
The first in-phase output end, the second in-phase output end of double D trigger are connected with the control terminal of the gate-controlled switch；Double D are touched
The first reversed-phase output, the second reversed-phase output of hair device are respectively connecting to the first input end of the processor, the second input
End.
Alternatively, the output end of the electric leakage signal process chip is additionally coupled to the 3rd input of the processor；Institute
The control terminal for stating gate-controlled switch is connected to the output end of the processor.
Second aspect of the present invention provides a kind of charging equipment, including：Power line, one end are connected with power supply, another
End is connected with charging equipment；Earth leakage protective dress described in first aspect or first aspect any one optional embodiment
Put；Hall current sensor, for detecting the current value flowed through in power line；The control module also passes with the Hall current
Sensor connects, and the current value for being exported according to the Hall current sensor judges whether to overload.
Third aspect present invention is provided using described in first aspect or first aspect any one optional embodiment
Earth detector carry out detection of electrical leakage method, including：The gate-controlled switch is controlled to disconnect；Control in the coil and produce
Alternating current or pulse current；Obtain the output signal of the electric leakage signal process chip；Judge the electric leakage signal processing core
Whether the output signal of piece is electric leakage；When the output signal of the electric leakage signal process chip is leaks electricity, control is described controllable
Switch conduction, electric power loop is detected.
Earth leakage protective device, electrical leakage detecting method and a kind of charging equipment that the embodiment of the present invention is provided, above-mentioned electric leakage
Protection device, leakage current signal is converted to by drain voltage signal by current sensor and sample circuit, the current sensor is worn
Cross power line；By electric leakage signal process chip according to drain voltage signal output leakage control signal；Connected in electric power loop
Gate-controlled switch；It is also provided with being wrapped in the coil on current sensor.Produce in control module control coil alternating current or
Pulse current, judge whether to leak electricity according to the output signal of electric leakage process chip, controllable shape is controlled when judged result is electric leakage
State is by the switching-on state of off-state, then starts normal detection of electrical leakage process.Electric current can be detected by the present invention to pass
Whether sensor, sample circuit, electric leakage signal process chip there is failure, start normal detection of electrical leakage again in no failure
Process, so as to ensure to leak electricity, result is more accurate, in time current supply circuit can be controlled to disconnect.
Brief description of the drawings
The features and advantages of the present invention can be more clearly understood by reference to accompanying drawing, accompanying drawing is schematically without that should manage
Solve to carry out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 shows the schematic diagram of existing leakage protection circuit；
Fig. 2 shows a kind of schematic diagram of earth leakage protective device according to embodiments of the present invention；
Fig. 3 shows the schematic diagram of current sensor according to embodiments of the present invention and sample circuit；
Fig. 4 shows the schematic diagram of another earth leakage protective device according to embodiments of the present invention；
Fig. 5 shows the specific control principle drawing of gate-controlled switch according to embodiments of the present invention；
Fig. 6 shows the schematic diagram of another earth leakage protective device according to embodiments of the present invention；
Fig. 7 shows the schematic diagram of another earth leakage protective device according to embodiments of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those skilled in the art are not having
There is the every other embodiment made and obtained under the premise of creative work, belong to the scope of protection of the invention.
Embodiment one
Fig. 2 shows a kind of schematic diagram of earth leakage protective device according to embodiments of the present invention.The earth leakage protective device can
For charging equipments such as charging pile, charging guns, or other electrical equipments.As shown in Fig. 2, the earth leakage protective device includes
Current sensor and sample circuit 10, electric leakage signal process chip 20, coil 30, gate-controlled switch 40 and control module 50.
Current sensor and sample circuit 10 are used to leakage current signal being converted to drain voltage signal, and the current sensor is worn
Power line is crossed, as shown in Figure 3.Electric leakage signal process chip 20 is used for according to drain voltage signal output leakage control signal, such as Fig. 3
It is shown.Coil 30 is wrapped on current sensor.
Alternatively, current sensor can be residual current sensor or zero sequence current sensor.When power line only has one
When root live wire and a zero line, residual current sensor can be used, this two power lines are sensed through residual current together
Device.When power line is three-phase transmission, residual current sensor can be used, by three phase lines and zero line (the also referred to as neutral conductor) one
Rise through residual current sensor；Or zero sequence current sensor can also be used, three phase lines or zero line are passed through into zero sequence
Current sensor.
Gate-controlled switch 40, is connected in electric power loop, for controlling electric power loop to be turned on or off.Gate-controlled switch can be
Relay.
Control module 50 is used to control gate-controlled switch 40 to be turned on or off.Two output ends of control module 50 can be distinguished
The control terminal that high and low level loads on relay is exported, controlling electric power loop to be turned on or off with this, (concrete condition is according to controllable
Switch as depending on normally closed or normally opened type)；When two output ends of control module 50 export high level or export low level
When, electric power loop switching state (switches to disconnection, or switching-on by disconnecting) by conducting.
The first input end of the control module 50 is connected with electric leakage signal process chip 20, and control module 50 is according to electric leakage
Control signal (i.e. the output signal of electric leakage signal process chip 20) judges whether to leak electricity.
The first output end, the second output end of the control module 50 are connected with the both ends of coil respectively, control module 50
Alternating current or pulse current are produced in control coil, and gate-controlled switch 40 is controlled by disconnection shape when judged result is leaks electricity
The switching-on state of state.
The embodiment of the present invention also provides the method that detection of electrical leakage is carried out using above-mentioned earth detector.As shown in Fig. 2 control
Molding block 50 controls gate-controlled switch 40 to disconnect first, and alternating current or pulse current are produced in control coil 30；Obtain electric leakage
Control signal (i.e. the output signal of electric leakage signal process chip 20), and judge whether to leak electricity according to leakage control signal.When sentencing
When disconnected result is leaks electricity, stop producing alternating current or pulse current in control coil 30, then control gate-controlled switch 40 to turn on；Obtain
Leakage control signal (i.e. the output signal of electric leakage signal process chip 20) is taken, and electric power loop is judged according to leakage control signal
Whether leak electricity.
Because the power supply signal in power line is alternating voltage, then when electric power loop disconnects, the control line of control module 50
Produce alternating current or pulse current in circle to turn on analog power loop and the situation of leakage current be present, if now controlling
Module 50 can then determine whether to leak electricity according to leakage control signal, if testing result is leakproof, show current sense
There is failure at least one of device, sample circuit, electric leakage signal process chip.
The embodiment of the present invention sets gate-controlled switch to control electric power loop to be turned on or off, you can is produced in control control coil
Before alternating current or pulse current detect to current sensor, sample circuit, electric leakage signal process chip, pass through control
Module disconnects electric power loop, in order to avoid Interference Detection process.In addition, current sensor, sample circuit, electric leakage signal process chip
When working properly, if control module judges have leakage current to be more than certain numerical value, in time gate-controlled switch can be controlled to disconnect, with
Exempt from that electric leakage accident occurs.
Above-mentioned earth leakage protective device, leakage current signal is converted to by drain voltage by current sensor and sample circuit and believed
Number, the current sensor passes through power line；By electric leakage signal process chip according to drain voltage signal output leakage control signal；
Connected in electric power loop gate-controlled switch；It is also provided with being wrapped in the coil on current sensor.Control module control coil
Interior generation alternating current or pulse current, judge whether to leak electricity, when judged result is according to the output signal of electric leakage process chip
Controllable state is controlled during electric leakage by the switching-on state of off-state, then starts normal detection of electrical leakage process.By this hair
It is bright to detect whether current sensor, sample circuit, electric leakage signal process chip failure occur, opened again in no failure
Begin normal detection of electrical leakage process, and so as to ensure to leak electricity, result is more accurate, in time current supply circuit can be controlled to disconnect.
Embodiment two
Fig. 4 shows the schematic diagram of another earth leakage protective device according to embodiments of the present invention.The earth leakage protective device
It can be used for the charging equipments such as charging pile, charging gun, or other electrical equipments.The earth leakage protective device is with embodiment one and in fact
The difference for applying example two is, the control terminal of gate-controlled switch 40 connects positive voltage, negative voltage by the first triode respectively, two the
The base stage of one triode is connected with the output end of control module 50.The setting can increase the magnitude of voltage that relay both ends are connected
(or voltage difference), so as to strengthen driving force of the control module for relay.
As shown in figure 4, one end of relay K1 and K2 control terminal is connected to+12V voltages by PNP triode Q1, Q1's
Resistance is connected between emitter stage and base stage；The other end is connected to -12V voltages, Q2 emitter stage and base by NPN triode Q2
Resistance is connected between pole.Q1 and Q2 base stage is respectively connecting to the output end 1 and 2 of control module.If the electricity that output end 1 is exported
Press as just and magnitude of voltage is sufficient so that Q1 less than 12V and turned on, or the voltage that is exported of output end 1 for it is negative when, Q1 conductings；With
This simultaneously, if the voltage that is exported of output end 2 is less than 12V for negative and magnitude of voltage is sufficient so that Q2 conductings, or the institute of output end 2
The voltage of output is timing, and Q2 is turned on.When Q1 and Q2 are simultaneously turned on, relay K1 and K2 both ends are respectively connecting to+12V
With -12V, so as to control electric power loop to be turned on or off.
As a kind of optional embodiment of the present embodiment, the first end of the control terminal of gate-controlled switch 40 passes through the first PNP tri-
Pole pipe Q1 connection positive voltages, the first PNP triode Q1 base stage are connected with the first NPN triodes Q3 colelctor electrode；First NPN
Triode Q3 grounded emitter, base stage are connected with the first output end of control module 50.
As shown in figure 5, when control module 50 exports any high level, the first NPN triode Q3 conductings, then+12V power supplys with
Voltage difference be present between first PNP triode Q1 base stage, so as to which the first PNP triode Q1 is turned on.
As a kind of optional embodiment of the present embodiment, the second end of the control terminal of gate-controlled switch 40 passes through the 2nd NPN tri-
Pole pipe Q2 connection negative voltages, the second NPN triode Q2 base stage are connected with the 2nd PNP triodes Q4 colelctor electrode；2nd PNP
Triode Q4 emitter stage connects positive voltage, and base stage is connected with the second output end of control module 50.
As shown in figure 5, when control module 50 exports low level, the second PNP triode Q4 is turned on, then -12V and the 2nd NPN
Voltage difference be present between triode Q2 base stage, so as to which the second NPN triode Q2 is turned on.
Embodiment three
Fig. 6 shows the schematic diagram of another earth leakage protective device according to embodiments of the present invention.The earth leakage protective device
It can be used for the charging equipments such as charging pile, charging gun, or other electrical equipments.The earth leakage protective device and embodiment one, reality
The difference for applying example two, embodiment three is that the first end of coil is connected to voltage source by first resistor, and the second end of coil leads to
Cross second resistance and be connected to voltage source；The colelctor electrode of 3rd NPN triode is connected between the first end of coil and first resistor,
The output end connection of grounded emitter, base stage and control module；The colelctor electrode of 4th NPN triode is connected to the second end of coil
Between second resistance, grounded emitter, the output end connection of base stage and control module.
As shown in fig. 6, the first end of coil is connected to+5V voltage sources by resistance R1, the second end of coil passes through resistance
R2 is also connected to+5V voltage sources.NPN triode Q5 colelctor electrode is connected between the first end of coil and resistance R1, emitter stage
Ground connection, base stage are connected with the output end 3 of control module 50.NPN triode Q6 colelctor electrode is connected to the second end and the electricity of coil
Between hindering R2, grounded emitter, base stage is connected with the output end 4 of control module 50.
When the output end 3 of control module 50 exports high level, output end 4 exports low level, Q5 conductings, Q6 are not turned on,
Then electric current flows to ground from the+5V voltage sources in left side through resistance R1, NPN triode Q5.Due to coil first end voltage less than+
5V, then electric current also from the+5V voltage sources on right side through resistance R2, coil, NPN triode Q5 flow directions ground.As can be seen here, when control mould
When block 50 controls the NPN triode Q5 conducting, Q6 to be not turned on, in coil the flow direction of electric current be from the second end flow to first end (i.e. from
Right side flow direction left side).
When the output end 3 of control module 50 exports low level, output end 4 exports high level, Q5 is not turned on, Q6 is turned on,
Then electric current flows to ground from the+5V voltage sources on right side through resistance R2, NPN triode Q6.Due to the end of coil second voltage less than+
5V, then electric current also from the+5V voltage sources in left side through resistance R1, coil, NPN triode Q6 flow directions ground.As can be seen here, when control mould
Block 50 controls NPN triode Q5 to be not turned on, Q6 conductings when, in coil the flow direction of electric current be from first end flow to the second end (i.e. from
Left side flow direction right side).
Therefore, by control module 50, alternately control " Q5 conductings, Q6 are not turned on ", " Q5 is not turned on, Q6 is turned on " are i.e. controllable
Coil inside processed produces alternating current or pulse current.
Example IV
Fig. 7 shows the schematic diagram of another earth leakage protective device according to embodiments of the present invention.The earth leakage protective device
It can be used for the charging equipments such as charging pile, charging gun, or other electrical equipments.The earth leakage protective device and embodiment one to reality
The difference for applying any embodiment in example four is that control module 50 includes double D trigger 51 and processor 52.
The output end of electric leakage signal process chip 20 with it is following at least one be connected：The direct set of double D trigger 51
End, directreset terminal, input end of clock, data input pin.
The input of processor 52 and/or output end with it is following at least one be connected：The direct set of double D trigger 51
End, directreset terminal, input end of clock, data input pin.
At least one output end of double D trigger 51 is connected with the control terminal of gate-controlled switch 40.
The output end signal of electric leakage signal process chip 20 and the output signal of processor 52 pass through double D trigger 51 respectively
Control gate-controlled switch 40 is turned on or off.When the output end signal of electric leakage signal process chip 20 is controlled by double D trigger 51
When gate-controlled switch 40 turns on or when disconnecting, processor 52 is obtained by the output end signal of double D trigger 51 and puts on controllable open
Close 40 control signal.
Double D trigger can be that rising edge triggers, or trailing edge triggers；Directset terminal and directreset terminal can
To be that high level is effective or low level is effective.
As a kind of optional embodiment of the present embodiment, double D trigger 51 is rising edge triggering, directset terminal and straight
It is effective for high level to connect reset terminal.Also,
The first directset terminal, second clock input and the output of electric leakage signal process chip 20 of double D trigger 51
End connection；
The first data input pin, the second directset terminal of double D trigger 51 are connected with the first output end of processor 52,
And it is grounded simultaneously；
The first input end of clock, the second directreset terminal of double D trigger 51 are connected with the second output end of processor 52,
And power supply is connect simultaneously；
First directreset terminal of double D trigger 51, the second data input pin ground connection；
The first in-phase output end, the second in-phase output end of double D trigger 51 are connected with the control terminal of gate-controlled switch 40；
It is first defeated to be respectively connecting to processor 52 for the first reversed-phase output, the second reversed-phase output of double D trigger 51
Enter end, the second input.
When data input pin input high level or low level, signal and data input pin institute that in-phase output end is exported
The signal of input is identical, and the signal that inverse output terminal is exported is opposite with the signal that data input pin is inputted.Above-mentioned double D triggerings
Device includes two completely self-contained d type flip flops, wherein, the first directset terminal, the first directreset terminal, the first data input
End, the first input end of clock, the first in-phase output end, the first reversed-phase output belong to the first d type flip flop；Second direct set
End, the second directreset terminal, the second data input pin, second clock input, the second in-phase output end, the second reversed-phase output
Belong to the second d type flip flop.
As shown in fig. 7, the first data input pin input low level of double D trigger 51, the first clock of double D trigger 51
Input elder generation input low level, then input high level, then input low level, then the first in-phase output end of double D trigger 51 is defeated
Go out low level.
Second directreset terminal input low level of double D trigger 51, the second directset terminal of double D trigger 51 are first defeated
Enter high level, then the second in-phase output end output high level of the low level inputted, then double D trigger 51.
The first directset terminal, the second clock input input high level of double D trigger 51, then double D trigger 51
First in-phase output end exports high level, the second in-phase output end output low level of double D trigger 51.
First data input pin input high level of double D trigger 51, the first input end of clock of double D trigger 51 are first defeated
Enter low level, then input high level, then the first in-phase output end output high level of double D trigger 51.
Second directset terminal elder generation input low level of double D trigger 51, the second directreset terminal of double D trigger 51 are defeated
Enter low level, then the second in-phase output end output low level of double D trigger 51.
Trigger for rising edge, directly put it should be added that above-mentioned optional embodiment only gives double D trigger
Position end and directreset terminal are the effective situation of high level, and those skilled in the art are easy to think according to above-mentioned optional embodiment
It is the effective situation of low level to trailing edge triggering, directset terminal and directreset terminal, belongs to the protection domain of the application,
The application will not be repeated here.
Alternatively, the output end of electric leakage signal process chip 20 is additionally coupled to the 3rd input of processor 52, controllable to open
The control terminal of pass 40 is connected to the output end of processor 52, so as to which processor 52 can be directly according to electric leakage signal process chip 20
The leakage control signal exported directly controls gate-controlled switch 40, ensures and still can in the case of double D trigger breaks down
Carry out earth leakage protective.
Alternatively, fuse F1, F2 are also in series with power line, such as the fuse that blowout current is 30A, to prevent from sending out
Raw short trouble causes fire risk.
Embodiment five
Present embodiments provide a kind of charging equipment.The charging equipment can be any one charging equipment, such as specifically
Can be charging pile or charging gun (can be hand-held charging gun).
The charging equipment includes power line, and one end is connected with power supply, and the other end is connected with charging equipment；Also include
Earth leakage protective device described in embodiment one to example IV or its any one optional embodiment.
The charging equipment also includes Hall current sensor, for detecting the current value flowed through in power line,
Control module 50 is also connected with Hall current sensor, and the current value for being exported according to Hall current sensor is sentenced
It is disconnected whether to overload.
As a kind of optional embodiment of the present embodiment, charging equipment also includes gate-controlled switch 40, for according to control
The control signal control electric power loop of module output is turned on or off, and specifically refers to embodiment three.Controller 50 is according to Hall
After the current value of current sensor output judges overload, electric power loop is controlled to disconnect by the gate-controlled switch 40.
Although being described in conjunction with the accompanying embodiments of the invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case of various modification can be adapted and modification, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (10)
- A kind of 1. earth leakage protective device, it is characterised in that including：Current sensor and sample circuit, for leakage current signal to be converted into drain voltage signal；The current sensor passes through Power line；Electric leakage signal process chip, for according to the drain voltage signal output leakage control signal；Coil, it is wrapped on the current sensor；Gate-controlled switch, it is connected in electric power loop, for controlling the electric power loop to be turned on or off；Control module, for controlling the gate-controlled switch to be turned on or off；The first input end of the control module and the leakage Electric signal processing chip connects, and the control module judges whether to leak electricity according to the leakage control signal；The control module Both ends respectively with the coil of the first output end, the second output end be connected, the control module is controlled in the coil and produced Raw alternating current or pulse current, and when judged result is led to control the gate-controlled switch to be switched to by off-state during electric leakage Logical state.
- 2. earth leakage protective device according to claim 1, it is characterised in that described device also includes：The control terminal of the gate-controlled switch connects positive voltage, negative voltage, two the one or three poles by the first triode respectively The base stage of pipe is connected with the output end of the control module.
- 3. earth leakage protective device according to claim 2, it is characterised in that the first end of the gate-controlled switch control terminal is led to The first PNP triode connection positive voltage is crossed, the base stage of first PNP triode is connected with the colelctor electrode of the first NPN triode；The grounded emitter of first NPN triode, base stage are connected with first output end of the control module.
- 4. earth leakage protective device according to claim 2, it is characterised in that the second end of the gate-controlled switch control terminal leads to The second NPN triode connection negative voltage is crossed, the base stage of second NPN triode is connected with the colelctor electrode of the second PNP triode；The emitter stage of second PNP triode connects positive voltage, and base stage is connected with second output end of the control module.
- 5. earth leakage protective device according to claim 1, it is characterised in that the first end of the coil passes through first resistor Voltage source is connected to, the second end of the coil is connected to the voltage source by second resistance；The colelctor electrode of 3rd NPN triode is connected between the first end of the coil and the first resistor, grounded emitter, Base stage is connected with the output end of the control module；The colelctor electrode of 4th NPN triode is connected between the second end of the coil and the second resistance, grounded emitter, Base stage is connected with the output end of the control module.
- 6. according to the earth leakage protective device described in any one of claim 1 to 5, it is characterised in that the control module includes：It is double D type flip flop and processor；The output end of the electric leakage signal process chip with it is following at least one be connected：The directset terminal of the double D trigger, Directreset terminal, input end of clock, data input pin；The input of the processor and/or output end with it is following at least one be connected：The direct set of the double D trigger End, directreset terminal, input end of clock, data input pin；At least one output end of the double D trigger is connected with the control terminal of the gate-controlled switch；The output end signal of the electric leakage signal process chip and the output signal of the processor are triggered by double D respectively Device controls the gate-controlled switch to be turned on or off；When the output end signal of the electric leakage signal process chip is touched by double D Send out when device controls gate-controlled switch conducting or the when of disconnection, the processor is obtained by the output end signal of the double D trigger Take the control signal for putting on the gate-controlled switch.
- 7. earth leakage protective device according to claim 6, it is characterised in that the double D trigger triggers for rising edge, directly It is that high level is effective to connect set end and directreset terminal；Also,The first directset terminal, second clock input and the output of the electric leakage signal process chip of the double D trigger End connection；The first data input pin, the second directset terminal of the double D trigger are connected with the first output end of the processor, And it is grounded simultaneously；The first input end of clock, the second directreset terminal of the double D trigger are connected with the second output end of the processor, And power supply is connect simultaneously；First directreset terminal of the double D trigger, the second data input pin ground connection；The first in-phase output end, the second in-phase output end of the double D trigger are connected with the control terminal of the gate-controlled switch；It is first defeated to be respectively connecting to the processor for the first reversed-phase output, the second reversed-phase output of the double D trigger Enter end, the second input.
- 8. earth leakage protective device according to claim 1, it is characterised in that the output end of the electric leakage signal process chip It is additionally coupled to the 3rd input of the processor；The control terminal of the gate-controlled switch is connected to the output end of the processor.
- A kind of 9. charging equipment, it is characterised in that including：Power line, one end are connected with power supply, and the other end is connected with charging equipment；Earth leakage protective device described in any one of claim 1 to 8；Hall current sensor, for detecting the current value flowed through in power line；The control module is also connected with the Hall current sensor, for the electricity exported according to the Hall current sensor Flow valuve judges whether to overload.
- 10. the method for detection of electrical leakage is carried out using the earth detector described in claim 1, it is characterised in that including：Control the gate-controlled switch to disconnect, and control and alternating current or pulse current are produced in the coil；The leakage control signal is obtained, and judges whether to leak electricity according to the leakage control signal；When judged result is electric leakage, controls and stop producing alternating current or pulse current in the coil, and can described in control Control switch conduction；The leakage control signal is obtained, and judges whether electric power loop leaks electricity according to the leakage control signal.
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| CN201711012135.XA CN107769159A (en) | 2017-10-25 | 2017-10-25 | A kind of earth leakage protective device, electrical leakage detecting method and a kind of charging equipment |
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| CN109917220A (en) * | 2019-03-27 | 2019-06-21 | 天长市龙亨电子有限公司 | A kind of electrical leakage detecting method for controller Hall element |
| CN110554233A (en) * | 2019-10-12 | 2019-12-10 | 深圳市欧瑞博科技有限公司 | fault current detection device and method applied to intelligent switch |
| CN111366873A (en) * | 2018-12-25 | 2020-07-03 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit and electric leakage detection method for electric water heater |
| CN113671232A (en) * | 2021-07-06 | 2021-11-19 | 国网思极神往位置服务（北京）有限公司 | Residual current detection device |
| CN113848509A (en) * | 2021-09-16 | 2021-12-28 | 南京康尼新能源汽车零部件有限公司 | Charging equipment electric leakage self-checking device and self-checking method |
| CN116454826A (en) * | 2023-06-14 | 2023-07-18 | 国电投山西能源服务有限公司 | Emergency protection circuit device for circuit fault |
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