CN208174237U - leakage protection circuit - Google Patents
leakage protection circuit Download PDFInfo
- Publication number
- CN208174237U CN208174237U CN201820240165.XU CN201820240165U CN208174237U CN 208174237 U CN208174237 U CN 208174237U CN 201820240165 U CN201820240165 U CN 201820240165U CN 208174237 U CN208174237 U CN 208174237U
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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
- H02H3/02—Details
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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
- H02H3/44—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 the rate of change of electrical quantities
-
- 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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- 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
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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
-
- 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
- G01R31/62—Testing of transformers
-
- 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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Keying Circuit Devices (AREA)
Abstract
The utility model discloses a kind of leakage protection circuits; including current detection circuit, detection flows through the electric current for being connected to first switch on major loop, obtains the current detection signal that characterization flows through first switch electric current; if current detection signal is lower than first threshold, judging input terminal, there are leakies；Control circuit controls the turn-on and turn-off of first switch, during the of short duration conducting of first switch, disconnects first switch if current detection signal is lower than first threshold by the electric current that current detection circuit detection flows through first switch；If current detection signal reaches first threshold, first switch is opened after switch protecting circuit acts on；Switch protecting circuit, if current detection signal reaches first threshold, by delay a period of time or detection input voltage, when input terminal voltage being waited to reach expected value or range, then control circuit opens first switch.The utility model begins to turn on switching tube when voltage is lower, so that protective switch pipe is not damaged.
Description
Technical field
The utility model relates to power electronics fields, more specifically, being related to a kind of earth leakage protective circuit.
Background technique
In load installation process, because of the logical situation of possible generating unit tap during the installation process, if human body is not small at this time
Heart contact, then be easy electric shock, influence safety operation.For example, in lighting area, since more lamp holder also maintains both-end access
Interface, when being replaced to original fluorescent tube, fluorescent tube that is general or using double-width grinding.The double-width grinding refer to by
The connector of ac input end is respectively provided at lamp tube ends, and in this case, lamp is generally first inserted into one end therein by operator
Seat, is then inserted into the other end, since operator's hand needs to grasp to be likely to be exposed the gold of end conduction in the end of fluorescent tube
The case where belonging to, being easy to happen electric shock, therefore be important to the earth leakage protective in the case of this kind.
It is connected with switching tube in power supply and power stage circuit in the prior art, is first connected when starting the work of entire circuit
Switching tube detects the electric current by switching tube, using the size of the electric current to determine whether leaky occurs, when the electric current is small
When threshold value, when determining generation leaky, on-off switching tube cuts off entire circuit, so that earth leakage protective is carried out, if the electricity
When stream is greater than the threshold value, switching tube on state is maintained.But it in the prior art, is needed due to earth leakage protective detection defeated
Enter to hold the higher when progress of voltage, it is special by the electric current of switching tube when switching tube is just begun to turn in leakage protection circuit in this way
Greatly, so that switching tube is easily damaged.
Utility model content
In view of this, the utility model proposes a kind of earth leakage protective electricity for beginning to turn on stage protective switch pipe in switching tube
Road is asked in the larger technology in turn resulting in switching tube damage of switching tube conducting phase input terminal voltage in the prior art for solving
Topic.
The utility model provides a kind of leakage protection circuit, including：
Current detection circuit, detection flow through the electric current for the first switch being connected on major loop, obtain characterization and flow through first
The current detection signal of switching current judges that input terminal has electric leakage if the current detection signal is lower than first threshold
Phenomenon；
Control circuit controls the turn-on and turn-off of first switch, during the of short duration conducting of the first switch, is examined by electric current
Slowdown monitoring circuit detects the electric current for flowing through first switch, if the current detection signal is lower than first threshold, makes the first switch
It is in an off state；If the current detection signal reaches the first threshold, opened after switch protecting circuit acts on described
First switch；
Switch protecting circuit passes through delay a period of time or inspection if the current detection signal reaches the first threshold
Input terminal voltage is surveyed, when input terminal voltage being waited to reach expected value or range, then the control circuit opens the first switch.
Optionally, the leakage protection circuit further includes voltage detecting circuit, voltage detecting circuit detection input voltage,
Voltage detection signal is obtained, the voltage detection signal reaches second threshold, and the control circuit control first switch is of short duration to be led
Logical, current detection circuit detects the electric current for flowing through first switch.
Optionally, if the current detection signal reaches the first threshold, the switch protecting circuit detection input
Voltage, when the input terminal voltage drops to third threshold value, the control circuit controls the first switch conducting, the third
Threshold value is less than the second threshold.
Optionally, the switch protecting circuit includes first comparator, and the first input end of the first comparator connects
Input terminal voltage is received, the second end of the first comparator receives third threshold value, when the input terminal voltage reaches third threshold value
When, the first switch conducting.
Optionally, if the current detection signal reaches the first threshold, the switch protecting circuit is from described first
For a period of time, so that the input terminal voltage reaches desired extent, the control is electric for delay from switching of short duration conducting finish time
Road controls the first switch conducting, and the desired extent is less than the second threshold.
Optionally, the switch protecting circuit includes timing circuit, from the first switch of short duration conducting finish time
Rise, the timing circuit starts timing, when timing for a period of time so that the input terminal voltage reaches desired extent, described the
One switch conduction.
Optionally, the control circuit includes pulse generating circuit, and the pulse generating circuit is examined with voltage respectively
Slowdown monitoring circuit, switch protecting circuit are connected with the control terminal of first switch.
Optionally, the first switch is metal-oxide-semiconductor, and the first end of the first switch is drain electrode, the first switch
Second end is source electrode, and the control terminal of the first switch is grid.
The utility model additionally provides a kind of leakage protection circuit, including：
Current detection circuit, detection flow through the electric current for the first switch being connected on major loop, obtain characterization and flow through first
The current detection signal of switching current judges that input terminal has electric leakage if the current detection signal is lower than first threshold
Phenomenon；
Control circuit controls the turn-on and turn-off of first switch, during the of short duration conducting of the first switch, is examined by electric current
Slowdown monitoring circuit detects the electric current for flowing through first switch, if the current detection signal is lower than first threshold, makes the first switch
It is in an off state；If the current detection signal reaches the first threshold, opened after switch protecting circuit acts on described
First switch；
Switch protecting circuit passes through delay a period of time, detection if the current detection signal reaches the first threshold
The voltage of the first switch first end or the pressure difference of the detection first switch first end and second end, wait described first to open
When the pressure difference of the voltage or the first switch first end and second end that close first end reaches expected value or range, then the control
First switch described in circuit debugging.
Optionally, the voltage of the first switch first end or the pressure of the first switch first end and second end are detected
Difference obtains voltage detection signal, and the voltage detection signal reaches second threshold, and it is of short duration that control circuit controls the first switch
Conducting, current detection circuit detect the electric current for flowing through first switch.
Optionally, if the current detection signal reaches the first threshold, the switch protecting circuit detection described the
The voltage of one switch first end or the pressure difference of the first switch first end and second end, when the electricity of the first switch first end
When the pressure difference of pressure or the first switch first end and second end drops to third threshold value, the control circuit control described first is opened
Conducting is closed, the third threshold value is less than the second threshold.
Optionally, if the current detection signal reaches the first threshold, the switch protecting circuit is from described first
It switchs and postpones a period of time from of short duration conducting finish time, so that the voltage of the first switch first end or the first switch
The pressure difference of first end and second end reaches desired extent, and the control circuit controls the first switch conducting, the expected model
It encloses and is less than the second threshold.
Compared with prior art, the technical solution of the utility model has the following advantages that：The utility model overcomes existing
Technology first switch begin to turn on stage input terminal voltage it is excessive to damage switch the problem of, current detection circuit detect
When leaky occurring into circuit, first switch is turned off；Leaky does not occur in circuit when current detection circuit detects
When, it is first turned off first switch, the first switch is connected in switch protecting circuit again after waiting input voltage to reduce, start work
Make.The utility model protects circuit by insertion switch, so that it is lower to begin to turn on stage input terminal voltage in switching tube, thus
Protective switch pipe is not damaged.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the utility model leakage protection circuit；
Fig. 2 is another structural schematic diagram of the utility model leakage protection circuit；
Fig. 3 is the working principle diagram of the utility model switch protecting circuit；
Fig. 4 is the physical circuit schematic diagram of the utility model leakage protection circuit embodiment one；
Fig. 5 is the physical circuit schematic diagram of the utility model leakage protection circuit embodiment two；
Fig. 6 is the physical circuit schematic diagram of the utility model leakage protection circuit embodiment three.
Specific embodiment
It is described in detail below in conjunction with preferred embodiment of the attached drawing to the utility model, but the utility model is not merely
It is limited to these embodiments.The utility model covers any substitution made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to make the public have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Concrete details is illustrated, and that this can also be understood completely is practical new for description without these details for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing
It is all made of more simplified form and uses non-accurate ratio, only to facilitate, lucidly aid in illustrating the utility model
The purpose of embodiment.
As shown in Figure 1, a kind of structural schematic diagram using the utility model leakage protection circuit is illustrated, when load is
When LED, then it can be used as LED drive circuit.The leakage protection circuit includes current detection circuit, switch protecting circuit, control
Circuit processed.
The current detection circuit detection flows through the electric current for the first switch M1 being connected on major loop, obtains characterization and flows through
The current detection signal of first switch M1 electric current judges that input terminal is deposited if the current detection signal is lower than first threshold
In leaky；
The turn-on and turn-off of the control circuit control first switch, during the of short duration conducting of first switch M1, by
Current detection circuit detects the electric current for flowing through first switch M1, if there are leaky, i.e., the described electricity for current detection circuit judgement
Stream detection signal is lower than first threshold, then is in an off state the first switch M1, so that major loop is in an off state；
If the current detection signal reaches the first threshold, terminates detection, described first is opened after switch protecting circuit acts on
Switch M1；
Switch protecting circuit passes through delay a period of time or detection input electricity in the case where leaky is not present
Pressure, when input terminal voltage being waited to reach expected value or range, then the control circuit opens the first switch M1.
The major loop, as operating circuit, the first switch M1 can control whether major loop disconnects.Described first
The control terminal of switch M1 is connect with the control circuit, by the turn-on and turn-off of control circuit control first switch M1.It is described
The of short duration conducting of first switch M1, turn-on and turn-off are controlled by control circuit.
The leakage protection circuit can also include voltage detecting circuit, and two input terminals of voltage detecting circuit connect respectively
Connect the both ends of rectifier bridge, the both ends of alternating current input power supplying or rectifier bridge an output end and alternating current input power supplying wherein one
End, the output end of voltage detecting circuit connect to the control circuit, then pulse generating circuit have been used in control circuit, then voltage
The output end of detection circuit is connect with pulse generating circuit.It is described when voltage detecting circuit detects that voltage is second threshold
Impulse generator issues pulse to control the of short duration conducting of the first switch, and the current detection circuit detection flows through first switch
The electric current of M1.Using voltage detecting circuit the advantage is that can determine a threshold value by voltage detecting circuit, i.e., in second threshold
Shi Jinhang detection, that is to say, that input voltage at this time be it is certain, be during this time connected first switch M1 and carry out electricity
Stream detection, obtained current detection signal actually characterize the internal resistance of circuit, and internal resistance whether due to electric leakage is different
(i.e. whether someone's body impedance accesses) can be characterized if human body access, which occurs, causes drain conditions by the current detection signal
Out.
Control first switch M1 it is of short duration conducting, conducting mode have very much, in the present embodiment using pulse generating circuit come
It realizes.
Driver in Fig. 1 is used for the driving of switching tube, and the control signal of control circuit is become suitable for control switch and is opened
Logical and shutdown control signal, has no substantial effect circuit theory, therefore omits it in the de-scription, but practical driving is opened
During closing pipe, driver realization is generally required.Those skilled in the art's description according to the present utility model, knows and can
It is practiced accordingly.
Impulse generator in the switch protecting circuit output end connection control circuit, when current detection circuit is judged
When input terminal does not leak electricity, the first switch shutdown, the switch protecting circuit is started to work, the switch protecting circuit
When judging that first switch M1 can be connected, then impulse generator is made to issue pulse signal, control circuit controls so that described the
One switch M1 conducting.
Another structural schematic diagram using the utility model leakage protection circuit is illustrated in Fig. 2, wherein voltage detecting
Circuit detects the voltage of the first switch first end or the pressure difference of the first switch first end and second end, voltage detecting electricity
The output end on road connects to the control circuit, and pulse generating circuit has been used in control circuit, then the output of voltage detecting circuit
End is connect with pulse generating circuit.When the voltage that voltage detecting circuit detects reaches second threshold, the impulse generator
Pulse is issued to control the of short duration conducting of the first switch, the current detection circuit detection flows through the electric current of first switch M1.
Current detection circuit in Fig. 2 is identical as the principle of Fig. 1.Voltage detecting circuit detects input respectively in Fig. 1 and Fig. 2
It holds voltage and detects the voltage of first switch first end or detect the pressure difference of first switch tube first end and second end, described the
Two threshold values are not identical, and third threshold value and the 4th threshold value are also similarly, here conveniently just for the sake of narration.
The working principle of the switch protecting circuit is as shown in Figure 3.Since this circuit needs biggish electricity in detection-phase
Pressure, therefore input terminal voltage, the voltage of the first switch first end or the first switch the is detected in voltage detecting circuit
When the pressure difference of one end and second end is V2, the control circuit controls the of short duration conducting of first switch M1, current detection circuit
It starts to work, and judges whether output end occurs phenomenon of getting an electric shock.Due at this time input voltage or the first switch first end
Voltage or the first switch first end and second end pressure difference it is very high, it is larger to the loss of first switch M1, thus when input
There is no when leaky, the first switch M1 shutdown terminates detection, drops to V3 or expection in Fig. 3 in voltage at end
When range when (voltage at this time is smaller than detection voltage V2), the control circuit controls the first switch M1 conducting.
When circuit does not leak electricity, protection circuit can realize that the first switch M1 is of short duration by two ways and lead
The pressure difference decline of input terminal voltage, the voltage of the first switch first end or the first switch first end and second end after logical
To the detection of V3 or desired extent.
First way：After first switch shutdown, the switch protecting circuit detection input voltage, the first switch
The pressure difference of the voltage of first end or the first switch first end and second end, when input terminal electricity or the first switch the
When the pressure difference pressure drop of the voltage of one end or the first switch first end and second end is to third threshold value V3, so that described first opens
Close M1 conducting.
The second way：After first switch shutdown, the switch protecting circuit is from the of short duration conducting of the first switch M1
Delay a period of time, so that the voltage or the first switch first of the input terminal voltage or the first switch first end
The pressure difference of end and second end drops to desired extent, and the first switch is connected in control circuit.
It is as shown in Figure 4 according to one circuit of specific embodiment that the first way and detection voltage are input voltage.Electricity
It includes bleeder circuit and comparator comp2 that pressure detection circuit, which includes the voltage detecting circuit, and the bleeder circuit is by resistance
R2 and R3 are composed in series, two input terminal is connected to the both ends of rectifier bridge, the both ends of alternating current input power supplying or rectifier bridge
An output end and alternating current input power supplying wherein one end, dotted portion indicates possible connection type in figure, i.e., to connection
Mode is illustrated and is illustrated in figure.The output end of the first input end connection bleeder circuit of the comparator comp2 is electricity
The common end of R2 and R3 is hindered, the second input terminal of the comp2 of comparator receives the signal Vref2 for characterizing the second threshold, when
When the voltage detection signal reaches Vref2, then comparator comp2 is overturn, and pulse generating circuit receives comparator comp2's
Output signal, and pulse is issued, make the of short duration conducting of first switch M1, the current detection circuit starts to detect work.
Current detection circuit includes sampling resistor R1 and comparator comp3, and sampling resistor R1 connects with first switch M1,
During the of short duration conducting of first switch M1, sampling flows through the electric current of first switch M1, and the first input of input comparator comp3
End, the second input terminal of comparator comp3 receives the signal Vref1 of characterization first threshold, when current detection signal is lower than
Vref1 indicates that there are leaky, first switch M1 is disconnected, and waits detection of electrical leakage next time.If the current detecting reaches
Vref1, level overturning occurs for comparator comp3 output end at this time, then it represents that leaky is not present, terminates detection, through switching
The first switch M1 is opened after protection circuit function；
Switch protecting circuit includes comparator comp1, and the first input end of comparator comp1 is public with resistance R2's and R3
End connection, the second end of the comp1 of comparator receive the signal Vref1 for characterizing the third threshold value, when the voltage detecting is believed
When number reaching Vref3, then comparator compl is overturn, and pulse generating circuit receives the output signal of comparator comp1, concurrently
First switch M1 is connected in pulse out.
According to the first way and detect voltage or the first switch that voltage is the first switch first end
Two circuit of pressure difference specific embodiment of first end and second end is as shown in Figure 5.
Voltage detecting circuit includes that the voltage detecting circuit includes bleeder circuit and comparator comp2, the partial pressure
Electric routing resistance R2 and R3 is composed in series, the voltage of two input terminals be respectively the first switch M1 first end and ground or
The first switch first end and second end, dotted portion indicates possible connection type in figure, i.e., to connection type in figure
Illustrated and is illustrated.The output end of the first input end connection bleeder circuit of the comparator comp2 is resistance R2 and R3
Common end, the second input terminal of the comp2 of comparator receive the signal Vref2 for characterizing the second threshold, when the voltage is examined
When survey signal reaches Vref2, then comparator comp2 is overturn, and pulse generating circuit receives the output signal of comparator comp2,
And pulse is issued, make the of short duration conducting of first switch M1, the current detection circuit starts to detect work.
The current detection circuit is identical as Fig. 4.Switch protecting circuit includes comparator comp1, and the of comparator comp1
One input terminal is connect with the common end of resistance R2 and R3, and the second end of the comp1 of comparator, which receives, characterizes the third threshold value
Signal Vref1, when the voltage detection signal reaches Vref3, then comparator comp1 is overturn, and pulse generating circuit receives
The output signal of comparator comp1, and pulse is issued, first switch M1 is connected.
Voltage detecting circuit is different with the detection voltage of switch protecting circuit in Fig. 4 and Fig. 5, remaining principle is essentially identical.
It is as shown in Figure 6 according to the specific embodiment three-circuit of the second way.The switch protecting circuit includes
Timing circuit, from the first switch of short duration conducting finish time, the control circuit controls the timing circuit and starts to count
When, when timing for a period of time so that the voltage or the first switch of the input terminal voltage or the first switch first end
The pressure difference of first end and second end reaches desired extent, and the impulse generator is connected to the output signal of the timing circuit, control
The conducting of first switch described in circuit processed, the timing circuit reset.
Remaining circuit is the same as example 1.
The case where detection voltage is input voltage is simply shown in Fig. 6, is the first switch in the detection voltage
When the voltage of first end or the pressure difference of the first switch first end and second end, still in the protection scope of the utility model
It is interior.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (12)
1. a kind of leakage protection circuit, which is characterized in that including：
Current detection circuit, detection flow through the electric current for the first switch being connected on major loop, obtain characterization and flow through first switch
The current detection signal of electric current, if the current detection signal is lower than first threshold, judging input terminal, there are leakies；
Control circuit controls the turn-on and turn-off of first switch, during the of short duration conducting of the first switch, by current detecting electricity
The electric current for flowing through first switch is detected on road, if the current detection signal is lower than first threshold, is in the first switch
Off-state；If the current detection signal reaches the first threshold, described first is opened after switch protecting circuit acts on
Switch；
Switch protecting circuit, it is defeated by delay a period of time or detection if the current detection signal reaches the first threshold
Enter and hold voltage, when input terminal voltage being waited to reach expected value or range, then the control circuit opens the first switch.
2. leakage protection circuit according to claim 1, it is characterised in that：The leakage protection circuit further includes voltage inspection
Slowdown monitoring circuit, voltage detecting circuit detection input voltage obtain voltage detection signal, and the voltage detection signal reaches the second threshold
Value, control circuit control the of short duration conducting of first switch, and current detection circuit detects the electric current for flowing through first switch.
3. leakage protection circuit according to claim 2, it is characterised in that：If the current detection signal reaches described
One threshold value, the switch protecting circuit detection input voltage, when the input terminal voltage drops to third threshold value, the control
The conducting of first switch described in circuit control, the third threshold value are less than the second threshold.
4. leakage protection circuit according to claim 3, it is characterised in that：The switch protecting circuit includes the first ratio
Compared with device, the first input end of the first comparator receives input terminal voltage, and the second end of the first comparator receives third
Threshold value, when the input terminal voltage reaches third threshold value, the first switch conducting.
5. leakage protection circuit according to claim 2, it is characterised in that：If the current detection signal reaches described
One threshold value, the switch protecting circuit postpones a period of time from the first switch of short duration conducting finish time, so that described
Input terminal voltage reaches desired extent, and the control circuit controls the first switch conducting, and the desired extent is less than described
Second threshold.
6. leakage protection circuit according to claim 5, it is characterised in that：The switch protecting circuit includes timing electricity
Road, from the first switch of short duration conducting finish time, the timing circuit starts timing, when timing for a period of time so that
The input terminal voltage reaches desired extent, the first switch conducting.
7. leakage protection circuit according to claim 1 or 2, it is characterised in that：The control circuit includes pulse hair
Raw circuit, the pulse generating circuit connect with the control terminal of voltage detecting circuit, switch protecting circuit and first switch respectively
It connects.
8. leakage protection circuit according to claim 1 or 2, it is characterised in that：The first switch is metal-oxide-semiconductor, described
The first end of first switch is drain electrode, and the second end of the first switch is source electrode, and the control terminal of the first switch is grid.
9. a kind of leakage protection circuit, which is characterized in that including：
Current detection circuit, detection flow through the electric current for the first switch being connected on major loop, obtain characterization and flow through first switch
The current detection signal of electric current, if the current detection signal is lower than first threshold, judging input terminal, there are leakies；
Control circuit controls the turn-on and turn-off of first switch, during the of short duration conducting of the first switch, by current detecting electricity
The electric current for flowing through first switch is detected on road, if the current detection signal is lower than first threshold, is in the first switch
Off-state；If the current detection signal reaches the first threshold, described first is opened after switch protecting circuit acts on
Switch；
Switch protecting circuit, if the current detection signal reaches the first threshold, by described in delay a period of time, detection
The pressure difference of the voltage of first switch first end or the detection first switch first end and second end waits the first switch the
When the voltage of one end or the pressure difference of the first switch first end and second end reach expected value or range, then the control circuit
Open the first switch.
10. leakage protection circuit according to claim 9, it is characterised in that：The leakage protection circuit further includes voltage
Detection circuit, voltage detecting circuit detect the first switch first end voltage or the first switch first end and second end
Pressure difference, obtain voltage detection signal, the voltage detection signal reaches second threshold, and control circuit controls the first switch
Of short duration conducting, current detection circuit detect the electric current for flowing through first switch.
11. leakage protection circuit according to claim 10, it is characterised in that：If the current detection signal reaches described
First threshold, the switch protecting circuit detect the voltage or the first switch first end and of the first switch first end
The pressure difference at two ends, when the voltage of the first switch first end or the pressure difference of the first switch first end and second end drop to
When three threshold values, the control circuit controls the first switch conducting, and the third threshold value is less than the second threshold.
12. leakage protection circuit according to claim 10, it is characterised in that：If the current detection signal reaches described
First threshold, the switch protecting circuit postpones a period of time from the first switch of short duration conducting finish time, so that institute
The pressure difference of the voltage or the first switch first end and second end of stating first switch first end reaches desired extent, the control
The conducting of first switch described in circuit control, the desired extent are less than the second threshold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710085646 | 2017-02-17 | ||
| CN2017100856468 | 2017-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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| CN201820241918.9U Active CN208174241U (en) | 2017-02-17 | 2018-02-10 | A kind of leakage protection circuit |
| CN201820240165.XU Active CN208174237U (en) | 2017-02-17 | 2018-02-10 | leakage protection circuit |
| CN201810139245.0A Pending CN108233332A (en) | 2017-02-17 | 2018-02-10 | A kind of leakage protection circuit and method |
| CN201810140125.2A Pending CN108270195A (en) | 2017-02-17 | 2018-02-10 | leakage protection circuit and method |
| CN201820247590.1U Active CN208174246U (en) | 2017-02-17 | 2018-02-11 | leakage protection circuit |
| CN201810143661.8A Pending CN108429236A (en) | 2017-02-17 | 2018-02-11 | A kind of leakage protection circuit and method |
| CN201820247694.2U Active CN208174243U (en) | 2017-02-17 | 2018-02-11 | A kind of leakage protection circuit |
| CN201810143966.9A Pending CN108462150A (en) | 2017-02-17 | 2018-02-11 | leakage protection circuit and method |
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| CN201810139245.0A Pending CN108233332A (en) | 2017-02-17 | 2018-02-10 | A kind of leakage protection circuit and method |
| CN201810140125.2A Pending CN108270195A (en) | 2017-02-17 | 2018-02-10 | leakage protection circuit and method |
| CN201820247590.1U Active CN208174246U (en) | 2017-02-17 | 2018-02-11 | leakage protection circuit |
| CN201810143661.8A Pending CN108429236A (en) | 2017-02-17 | 2018-02-11 | A kind of leakage protection circuit and method |
| CN201820247694.2U Active CN208174243U (en) | 2017-02-17 | 2018-02-11 | A kind of leakage protection circuit |
| CN201810143966.9A Pending CN108462150A (en) | 2017-02-17 | 2018-02-11 | leakage protection circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108270195A (en) * | 2017-02-17 | 2018-07-10 | 杰华特微电子（杭州）有限公司 | leakage protection circuit and method |
Families Citing this family (7)
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| CN111148309B (en) * | 2018-10-16 | 2023-08-25 | 卡任特照明解决方案有限公司 | Lamp driving circuit and method for operating the same |
| US10976762B2 (en) * | 2018-10-26 | 2021-04-13 | Rolls-Royce North American Technologies, Inc. | Control of an electrical power system responsive to sensing a ground fault |
| CN110601134A (en) * | 2019-09-10 | 2019-12-20 | 杰华特微电子（杭州）有限公司 | Leakage protection circuit, protection method and lighting circuit applying leakage protection circuit |
| CN111368500A (en) | 2020-03-06 | 2020-07-03 | 杰华特微电子（杭州）有限公司 | Method for establishing metal interconnection layer capacitance prediction model and model system |
| CN115441399A (en) * | 2020-05-26 | 2022-12-06 | 芯海科技（深圳）股份有限公司 | Leakage protection circuit, integrated circuit, electronic device, and method |
| CN111983440B (en) * | 2020-07-16 | 2023-03-24 | 中广核核电运营有限公司 | Socket detection method and socket detection device |
| CN113014128A (en) * | 2021-03-26 | 2021-06-22 | 安徽电气工程职业技术学院 | DCAC control circuit in domestic dc-to-ac converter |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI258909B (en) * | 2005-01-10 | 2006-07-21 | Cable Vision Electronics Co Lt | Overcurrent protection device |
| CN201122833Y (en) * | 2007-11-19 | 2008-09-24 | 海尔集团公司 | Micro-controlled electricity-saving protection device |
| JP6322957B2 (en) * | 2013-10-30 | 2018-05-16 | 株式会社オートネットワーク技術研究所 | Overcurrent protection circuit |
| CN103746342B (en) * | 2014-01-10 | 2016-09-21 | 成都芯源系统有限公司 | Boost converter, controller for boost converter and short-circuit protection method |
| CN204216632U (en) * | 2014-11-27 | 2015-03-18 | 北京拓盛电子科技有限公司 | Battery discharge prevention circuit |
| CN104377647B (en) * | 2014-11-27 | 2018-02-27 | 德力西电气有限公司 | leakage protection circuit |
| CN204205560U (en) * | 2014-11-27 | 2015-03-11 | 德力西电气有限公司 | leakage protection circuit |
| US9660516B2 (en) * | 2014-12-10 | 2017-05-23 | Monolithic Power Systems, Inc. | Switching controller with reduced inductor peak-to-peak ripple current variation |
| CN204615366U (en) * | 2015-05-19 | 2015-09-02 | 成都欧安电气有限公司 | A kind of double-current defencive function power supply |
| CN105375764B (en) * | 2015-11-11 | 2018-05-29 | 矽力杰半导体技术(杭州)有限公司 | Switch controlled circuit |
| CN105929929A (en) * | 2016-05-13 | 2016-09-07 | 上海墨百意信息科技有限公司 | Circuit for eliminating electric leakage of device in shutdown state |
| CN106230258B (en) * | 2016-08-29 | 2018-12-14 | 杰华特微电子（杭州）有限公司 | The driving method and circuit and power-supply system of power switch tube |
| CN208174241U (en) * | 2017-02-17 | 2018-11-30 | 杰华特微电子（杭州）有限公司 | A kind of leakage protection circuit |
-
2018
- 2018-02-10 CN CN201820241918.9U patent/CN208174241U/en active Active
- 2018-02-10 CN CN201820240165.XU patent/CN208174237U/en active Active
- 2018-02-10 CN CN201810139245.0A patent/CN108233332A/en active Pending
- 2018-02-10 CN CN201810140125.2A patent/CN108270195A/en active Pending
- 2018-02-11 CN CN201820247590.1U patent/CN208174246U/en active Active
- 2018-02-11 CN CN201810143661.8A patent/CN108429236A/en active Pending
- 2018-02-11 CN CN201820247694.2U patent/CN208174243U/en active Active
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108270195A (en) * | 2017-02-17 | 2018-07-10 | 杰华特微电子（杭州）有限公司 | leakage protection circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN208174243U (en) | 2018-11-30 |
| CN108270195A (en) | 2018-07-10 |
| CN108233332A (en) | 2018-06-29 |
| CN208174241U (en) | 2018-11-30 |
| CN108462150A (en) | 2018-08-28 |
| CN208174246U (en) | 2018-11-30 |
| CN108429236A (en) | 2018-08-21 |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |