CN107749612A - A kind of power transformer with DC leakage protection - Google Patents
A kind of power transformer with DC leakage protection Download PDFInfo
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- CN107749612A CN107749612A CN201711212426.3A CN201711212426A CN107749612A CN 107749612 A CN107749612 A CN 107749612A CN 201711212426 A CN201711212426 A CN 201711212426A CN 107749612 A CN107749612 A CN 107749612A
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- 230000004224 protection Effects 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 89
- 230000005611 electricity Effects 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 230000006698 induction Effects 0.000 claims description 83
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims 1
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
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- 238000002955 isolation Methods 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
-
- 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
- H02H3/26—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
- H02H3/33—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 using summation current transformers
- H02H3/332—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 using summation current transformers with means responsive to dc component in the fault current
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of power transformer with DC leakage protection, include shell, the power input interface electrically connected with city is provided with the shell, the power input interface is sequentially connected with the direct current variable-current circuit for alternating current to be converted to direct current, the two-way electric-leakage detection circuit of direct current, power off execution circuit, filter circuit, main power conversion circuit and the power output interface being connected with electrical appliance, it is also associated between the two-way electric-leakage detection circuit of the direct current and power-off execution circuit for control power-off execution circuit disconnects when the two-way electric-leakage detection circuit of direct current detects electric leakage arithmetic processing circuit, the present invention can be to the positive pole of the high voltage direct current of power source internal, negative pole bidirectional current carries out detection of electrical leakage, and the connection of power-down circuit deenergization is controlled when leaking electricity, improve safety in utilization.
Description
[technical field]
The present invention relates to a kind of power transformer with DC leakage protection.
[background technology]
In power supply changeover device and charger, alternating current is typically converted into by ballast bridge and electric capacity by direct current below figure 1
Described, as charging of mobile devices device becomes direct current after AC220 is by rectifier bridge and electric capacity, this direct current is to include positive pole
More than+110 volts relative to the earth with negative pole exceed -110 volts voltage relative to the earth, when any one pole of the two electrodes is leaked electricity
When, the RCCB in conventional distribution box can not necessarily be triggered protection, when this DC leakage contacts human body, with more danger
It is dangerous.
In existing power supply changeover device and charger, its output end largely be all it is independent, the light current of output end with
There was only minimum spacing isolation, generally 7mm between the forceful electric power of input, and output end does not have other safeguard protections electricity
Road, therefore work as Changes in weather, steam is set between light current and forceful electric power, or conductive debris, even toy climb into just
Well fall between light current and forceful electric power when so that output end directly connects with input so that output port may just directly with
City electrically connects, and now when human body touches output end, there is the potential safety hazard of human electric shock.
On the other hand, existing RCCB can not detect that direct current leaks electricity well.
[content of the invention]
Instant invention overcomes the deficiency of above-mentioned technology, there is provided a kind of power transformer with DC leakage protection, can be with
Positive pole, negative pole bidirectional current to the high voltage direct current of power source internal carry out detection of electrical leakage, and control and break when leaking electricity
Circuit deenergization connects, and improves safety in utilization.
A kind of power transformer with DC leakage protection, includes shell 100, is provided with the shell 100 and civil power
The power input interface 1 of connection, the power input interface 1 are sequentially connected with the direct current for alternating current to be converted to direct current
The two-way electric-leakage detection circuit 3 of variable-current circuit 2, direct current, power-off execution circuit 4, filter circuit 5, main power conversion circuit 6 with
And the power output interface 7 being connected with electrical appliance, between the two-way electric-leakage detection circuit 3 of the direct current and power-off execution circuit 4 also
It is connected with the calculation process for the control power-off disconnection of execution circuit 4 when the two-way electric-leakage detection circuit 3 of direct current detects electric leakage
Circuit 8.
The power-off execution circuit 4 is connected with reset circuit 9, the two-way electric-leakage detection circuit 3 of the direct current and calculation process
Circuit 8 is connected with in-line power circuit 10 respectively.
The two-way electric-leakage detection circuit 3 of direct current for be set on direct current variable-current circuit 2 or direct current variable-current electricity
In the output end of road 2, the two-way electric-leakage detection circuit 3 of direct current is the electronics device for the negative or positive electrode electric leakage that may detect direct current
Part, electronic device are coil electromagnetism induction coupling or photoelectrical coupler.
The two-way electric-leakage detection circuit 3 of direct current is the induction coil being set in the output end of direct current variable-current circuit 2
Core1, induction coil Core1 output ends are connected with arithmetic processing circuit 8, and the arithmetic processing circuit 8 includes amplifier
IC1, amplifier IC2, the first latch 1, the second latch 2, OR gate 1, amplifier IC1 output ends input with the first latch 1
End connection, amplifier IC1 negative inputs by resistance R13 respectively with resistance R12 one end, the two-way electric-leakage detection circuit 3 of direct current
The connection of middle output ends of induction coil Core1 mono-, amplifier IC1 electrode input ends respectively with the resistance R12 other ends, electric capacity C11 mono-
Another output end connections of induction coil Core1, electric capacity C11 other ends ground connection, OR gate 1 in end, the two-way electric-leakage detection circuit 3 of direct current
One input is connected with the output end of the first latch 1, and amplifier IC2 output ends are connected with the input of the second latch 2, amplifier
IC2 negative inputs are connected with resistance R10 one end, amplifier IC1 electrode input ends respectively by resistance R11, and amplifier IC2 is just
Pole input is connected with the resistance R10 other ends, electric capacity C10 one end, amplifier IC1 negative inputs respectively, and electric capacity C10 is another
End ground connection, 1 another input of OR gate are connected with the output end of the second latch 2, and the output end of OR gate 1 connects with power-off execution circuit 4
Connect, amplifier IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the cathode power supply input of the first latch 1,
The cathode power supply input of second latch 2 is connected with VCC power supplys respectively, amplifier IC1 negative power supplies input, amplifier IC2
Negative power supply input, the negative power supply input of the first latch 1, the negative power supply input of the second latch 2 are grounded respectively.
The two-way electric-leakage detection circuit 3 of direct current is the induction coil being set in the output end of direct current variable-current circuit 2
Core1, induction coil Core1 output ends are connected with arithmetic processing circuit 8, and the arithmetic processing circuit 8 includes amplifier IC1
With the first latch 1, amplifier IC1 output ends are connected with the input of the first latch 1, and amplifier IC1 negative inputs pass through
Resistance R13 is connected with the output ends of induction coil Core1 mono- in resistance R12 one end, the two-way electric-leakage detection circuit 3 of direct current respectively, is put
Big device IC1 electrode input ends in the resistance R12 other ends, electric capacity C11 one end, the two-way electric-leakage detection circuit 3 of direct current respectively with sensing
Another output end connections of coil Core1, electric capacity C11 other ends ground connection, the output end of the first latch 1 connect with power-off execution circuit 4
Connect, amplifier IC1 cathode power supplies input, the cathode power supply input of the first latch 1 are connected with power supply VCC respectively, amplifier
IC1 negative power supplies input, the negative power supply input of the first latch 1 are grounded respectively.
The two-way electric-leakage detection circuit 3 of direct current, which includes, to be respectively sleeved in the output end of direct current variable-current circuit 2
Induction coil Core1 and induction coil Core2, induction coil Core1 and induction coil Core2 output ends respectively with computing
Reason circuit 8 connects, and the arithmetic processing circuit 8 includes amplifier IC1, amplifier IC2, the first latch 1, the second latch
2nd, OR gate 1, amplifier IC1 output ends are connected with the input of the first latch 1, and amplifier IC1 negative inputs pass through resistance R13
It is connected respectively with the output ends of induction coil Core1 mono- in resistance R12 one end, the two-way electric-leakage detection circuit 3 of direct current, amplifier IC1
Electrode input end respectively with induction coil in the resistance R12 other ends, electric capacity C11 one end, the two-way electric-leakage detection circuit 3 of direct current
Another output end connections of Core1, electric capacity C11 other ends ground connection, the input of OR gate 1 one are connected with the output end of the first latch 1, put
Big device IC2 output ends are connected with the input of the second latch 2, amplifier IC2 negative inputs by resistance R11 respectively with resistance
The output ends of induction coil Core2 mono- connect in R10 one end, the two-way electric-leakage detection circuit 3 of direct current, amplifier IC2 electrode input ends
Respectively with another outputs of induction coil Core2 in the resistance R10 other ends, electric capacity C10 one end, the two-way electric-leakage detection circuit 3 of direct current
End connection, electric capacity C10 other ends ground connection, 1 another input of OR gate is connected with the output end of the second latch 2, the output end of OR gate 1 and
Power-off execution circuit 4 connects, amplifier IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the first latch 1
Cathode power supply input, the cathode power supply input of the second latch 2 are connected with VCC power supplys respectively, amplifier IC1 negative power supplies
Input, amplifier IC2 negative power supplies input, the negative power supply input of the first latch 1, the negative power supply of the second latch 2
Input is grounded respectively.
The two-way electric-leakage detection circuit 3 of direct current is the induction coil being set in the output end of direct current variable-current circuit 2
Core1, induction coil Core1 output ends are connected with arithmetic processing circuit 8, and the arithmetic processing circuit 8 includes amplifier
IC1, the first latch 1, triode Q2, triode Q3, amplifier IC1 electrode input ends by resistance R13 respectively with resistance R12
The output ends of induction coil Core1 mono- connect in one end, the two-way electric-leakage detection circuit 3 of direct current, amplifier IC1 negative inputs difference
Output end another with induction coil Core1 in the resistance R12 other ends, electric capacity C11 one end, the two-way electric-leakage detection circuit 3 of direct current connects
Connect, electric capacity C11 other ends ground connection, amplifier IC1 cathode power supplies input is connected with power supply VCC, and amplifier IC1 negative power supplies are defeated
Entering end to be connected with power supply-VCC, amplifier IC1 output ends are connected with diode D4 positive terminals, diode D5 negative pole ends respectively, and two
Pole pipe D4 negative pole ends are connected with triode Q3 colelctor electrodes, the input of the first latch 1 respectively, triode Q3 base stages respectively with electricity
R17 one end, the connection of resistance R18 one end are hindered, the resistance R18 other ends, triode Q3 emitter stages are grounded respectively, the resistance R17 other ends
It is connected with triode Q2 colelctor electrodes, triode Q2 base stages are grounded by resistance R14, and triode Q2 emitter stages and diode D5 are just
Extreme connection, the output end of first memory 1 are connected with power-off execution circuit 4.
The two-way electric-leakage detection circuit 3 of direct current is the sensing being set in the transformer output end of main power conversion circuit 6
Coil Core1, induction coil Core1 output ends are connected with arithmetic processing circuit 8, and the arithmetic processing circuit 8 includes amplification
Device IC1, amplifier IC2, the first latch 1, the second latch 2, OR gate 1, amplifier IC1 output ends and the first latch 1 are defeated
Enter end connection, amplifier IC1 negative inputs are electric with resistance R12 one end, the two-way detection of electrical leakage of direct current respectively by resistance R13
In road 3 output ends of induction coil Core1 mono- connect, amplifier IC1 electrode input ends respectively with the resistance R12 other ends, electric capacity
Another output end connections of induction coil Core1 in C11 one end, the two-way electric-leakage detection circuit 3 of direct current, electric capacity C11 other ends ground connection,
The input of OR gate 1 one is connected with the output end of the first latch 1, and amplifier IC2 output ends are connected with the input of the second latch 2,
Amplifier IC2 negative inputs are connected with resistance R10 one end, amplifier IC1 electrode input ends respectively by resistance R11, amplification
Device IC2 electrode input ends are connected with the resistance R10 other ends, electric capacity C10 one end, amplifier IC1 negative inputs respectively, electric capacity
The C10 other ends are grounded, and 1 another input of OR gate is connected with the output end of the second latch 2, and the output end of OR gate 1 performs electricity with power-off
Road 4 connects, and amplifier IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the cathode power supply of the first latch 1 are defeated
Enter end, the cathode power supply input of the second latch 2 is connected with VCC power supplys respectively, amplifier IC1 negative power supplies input, amplification
Device IC2 negative power supplies input, the negative power supply input of the first latch 1, the negative power supply input of the second latch 2 connect respectively
Ground.
The power-off execution circuit 4 is relay or electrical apparatus release.
The arithmetic processing circuit 8 is analog operational circuit or/and digital operational circuit.
To achieve the above object, present invention employs following technical proposal：
The beneficial effects of the invention are as follows：
The present invention detects source-drain situation by the two-way electric-leakage detection circuit of direct current, substantially increases the safety of power supply
Property；When leaking electricity, deenergization connects, and eliminates electric leakage, avoids user from getting an electric shock, improve safety in utilization.
[brief description of the drawings]
Fig. 1 is power transformer DC converting circuit schematic diagram；
Fig. 2 is schematic structural view of the invention；
Fig. 3 is the structural representation of the embodiment of the present invention one；
Fig. 4 is the structural representation of the embodiment of the present invention two；
Fig. 5 is the structural representation of the embodiment of the present invention three；
Fig. 6 is the structural representation of the embodiment of the present invention four；
Fig. 7 is the structural representation of the embodiment of the present invention five.
[embodiment]
It is described in further detail below in conjunction with the accompanying drawings with embodiments of the present invention：
As shown in Fig. 2 a kind of power transformer with DC leakage protection, includes shell 100, in the shell 100
Provided with the power input interface 1 electrically connected with city, the power input interface 1 has been sequentially connected with for alternating current to be converted to directly
Flow direct current variable-current circuit 2, the two-way electric-leakage detection circuit 3 of direct current, power-off execution circuit 4, filter circuit 5, the main power source of electricity
Change-over circuit 6 and the power output interface 7 being connected with electrical appliance, the two-way electric-leakage detection circuit 3 of direct current perform with power-off
It is also associated with being used for the control power-off execution circuit 4 when the two-way electric-leakage detection circuit 3 of direct current detects electric leakage between circuit 4 to disconnect
Arithmetic processing circuit 8.
Wherein, the two-way electric-leakage detection circuit 3 of the direct current for be set on direct current variable-current circuit 2 or direct current change electricity
In the output end of current circuit 2, the two-way electric-leakage detection circuit 3 of direct current is the electricity for the negative or positive electrode electric leakage that may detect direct current
Sub- device, electronic device are coil electromagnetism induction coupling or photoelectrical coupler.
The power-off execution circuit 4 is connected with reset circuit 9, and reset circuit 9 is manually operated mechanical device or automatic
Electronic circuit or be manually operated electronic circuit, realize eliminate electric leakage after recover power transformer normal work, it is described
The two-way electric-leakage detection circuit 3 of direct current is connected with in-line power circuit 10 respectively with arithmetic processing circuit 8, and in-line power circuit 10 can
From the power taking of power input interface 1, the power taking of power output interface 7 or independent current source.
The direct current variable-current circuit 5 is generally made up of, institute to produce the circuit of change direct current rectifier bridge or diode
It is relay or electrical apparatus release to state power-off execution circuit 2, and the arithmetic processing circuit 3 is analog operational circuit or/and digital operation
Circuit, the power output interface 8 are power interface or USB interface.
Operation principle is as follows：
Transformer works, and civil power is transferred to direct current variable-current circuit 2 by power input interface 1, then passes through filtered electrical
Civil power is converted into the power supply needed for user by road 5 and main power conversion circuit 6, and is exported by power output interface 7, in transformation
During device works, when the two-way electric-leakage detection circuit 3 of direct current, which detects direct current, to leak electricity, electric leakage signal is transferred to computing
Process circuit 8, the control power-off execution circuit 4 of arithmetic processing circuit 8 work, cut off the electricity supply, the earth leakage protective for playing input is made
With.
Embodiment one：
As shown in figure 3, direct current variable-current circuit 2 is rectifier bridge, the two-way electric-leakage detection circuit 3 of direct current is by induction coil
Core1, amplifier IC1, amplifier IC2 compositions.
The two-way electric-leakage detection circuit 3 of direct current is the induction coil being set in the output end of direct current variable-current circuit 2
Core1, induction coil Core1 output ends are connected with arithmetic processing circuit 8, and the arithmetic processing circuit 8 includes amplifier
IC1, amplifier IC2, the first latch 1, the second latch 2, OR gate 1, amplifier IC1 output ends input with the first latch 1
End connection, amplifier IC1 negative inputs by resistance R13 respectively with resistance R12 one end, the two-way electric-leakage detection circuit 3 of direct current
The connection of middle output ends of induction coil Core1 mono-, amplifier IC1 electrode input ends respectively with the resistance R12 other ends, electric capacity C11 mono-
Another output end connections of induction coil Core1, electric capacity C11 other ends ground connection, OR gate 1 in end, the two-way electric-leakage detection circuit 3 of direct current
One input is connected with the output end of the first latch 1, and amplifier IC2 output ends are connected with the input of the second latch 2, amplifier
IC2 negative inputs are connected with resistance R10 one end, amplifier IC1 electrode input ends respectively by resistance R11, and amplifier IC2 is just
Pole input is connected with the resistance R10 other ends, electric capacity C10 one end, amplifier IC1 negative inputs respectively, and electric capacity C10 is another
End ground connection, 1 another input of OR gate are connected with the output end of the second latch 2, and the output end of OR gate 1 connects with power-off execution circuit 4
Connect, amplifier IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the cathode power supply input of the first latch 1,
The cathode power supply input of second latch 2 is connected with VCC power supplys respectively, amplifier IC1 negative power supplies input, amplifier IC2
Negative power supply input, the negative power supply input of the first latch 1, the negative power supply input of the second latch 2 are grounded respectively.
Operation principle is：Direct current variable-current circuit 2 is that rectifier bridge produces pulsating direct current, the two-way electric-leakage detection circuit of direct current
1 has included induction coil Core1, amplifier IC1, amplifier IC2, can produce arteries and veins on induction coil Core1 when leaking electricity
Dynamic voltage x current, amplifier IC1, amplifier IC2 are just being put simultaneously to caused voltage x current on induction coil Core1 respectively
Greatly, anti-amplification, the electric leakage situation of direct current electric bipolar, and the electric leakage that will be detected are detected by the two-way electric-leakage detection circuit 1 of direct current
Signal is transferred to arithmetic processing circuit 8, and the control power-off execution circuit 4 of arithmetic processing circuit 8 is cut off the electricity supply, and plays earth leakage protective work
With；After eliminating electric leakage, resumed work by reset circuit 9.
Embodiment two：
As shown in figure 4, direct current variable-current circuit 2 is rectifier bridge, the two-way electric-leakage detection circuit 3 of direct current is by induction coil
Core1, amplifier IC1 are formed, and an amplifier circuit response speed can be slower than the response speed of two amplifier circuits.
The two-way electric-leakage detection circuit 3 of direct current is the induction coil being set in the output end of direct current variable-current circuit 2
Core1, induction coil Core1 output ends are connected with arithmetic processing circuit 8, and the arithmetic processing circuit 8 includes amplifier IC1
With the first latch 1, amplifier IC1 output ends are connected with the input of the first latch 1, and amplifier IC1 negative inputs pass through
Resistance R13 is connected with the output ends of induction coil Core1 mono- in resistance R12 one end, the two-way electric-leakage detection circuit 3 of direct current respectively, is put
Big device IC1 electrode input ends in the resistance R12 other ends, electric capacity C11 one end, the two-way electric-leakage detection circuit 3 of direct current respectively with sensing
Another output end connections of coil Core1, electric capacity C11 other ends ground connection, the output end of the first latch 1 connect with power-off execution circuit 4
Connect, amplifier IC1 cathode power supplies input, the cathode power supply input of the first latch 1 are connected with power supply VCC respectively, amplifier
IC1 negative power supplies input, the negative power supply input of the first latch 1 are grounded respectively.
Operation principle is：Direct current variable-current circuit 2 is that rectifier bridge produces pulsating direct current, the two-way electric-leakage detection circuit of direct current
Contain an an induction coil Core1 and amplifier IC1 in 3, pulsation can be produced on induction coil Core1 when leaking electricity
Voltage x current, single amplifier IC1 only carry out unidirectional positive or reverse to caused voltage x current on induction coil Core1
Amplification, response time can be slightly slow, and the electric leakage situation of direct current electric bipolar is detected by the two-way electric-leakage detection circuit 3 of direct current, and will inspection
The electric leakage signal measured is transferred to arithmetic processing circuit 8, and the control power-off of arithmetic processing circuit 8 performs electricity 4 and cut off the electricity supply, plays Lou
Electrical protection；After eliminating electric leakage, resumed work by reset circuit 9.
Embodiment three：
As shown in figure 5, direct current variable-current circuit 2 is rectifier bridge, the two-way electric-leakage detection circuit 3 of direct current is by a sensing
Coil Core1, an amplifier IC1 composition, an amplifier circuit response speed can be than the response speed of two amplifier circuits
Degree is slow.
The two-way electric-leakage detection circuit 3 of direct current, which includes, to be respectively sleeved in the output end of direct current variable-current circuit 2
Induction coil Core1 and induction coil Core2, induction coil Core1 and induction coil Core2 output ends respectively with computing
Reason circuit 8 connects, and the arithmetic processing circuit 8 includes amplifier IC1, amplifier IC2, the first latch 1, the second latch
2nd, OR gate 1, amplifier IC1 output ends are connected with the input of the first latch 1, and amplifier IC1 negative inputs pass through resistance R13
It is connected respectively with the output ends of induction coil Core1 mono- in resistance R12 one end, the two-way electric-leakage detection circuit 3 of direct current, amplifier IC1
Electrode input end respectively with induction coil in the resistance R12 other ends, electric capacity C11 one end, the two-way electric-leakage detection circuit 3 of direct current
Another output end connections of Core1, electric capacity C11 other ends ground connection, the input of OR gate 1 one are connected with the output end of the first latch 1, put
Big device IC2 output ends are connected with the input of the second latch 2, amplifier IC2 negative inputs by resistance R11 respectively with resistance
The output ends of induction coil Core2 mono- connect in R10 one end, the two-way electric-leakage detection circuit 3 of direct current, amplifier IC2 electrode input ends
Respectively with another outputs of induction coil Core2 in the resistance R10 other ends, electric capacity C10 one end, the two-way electric-leakage detection circuit 3 of direct current
End connection, electric capacity C10 other ends ground connection, 1 another input of OR gate is connected with the output end of the second latch 2, the output end of OR gate 1 and
Power-off execution circuit 4 connects, amplifier IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the first latch 1
Cathode power supply input, the cathode power supply input of the second latch 2 are connected with VCC power supplys respectively, amplifier IC1 negative power supplies
Input, amplifier IC2 negative power supplies input, the negative power supply input of the first latch 1, the negative power supply of the second latch 2
Input is grounded respectively.
Operation principle is：Direct current variable-current circuit 2 is that rectifier bridge produces pulsating direct current, the two-way electric-leakage detection circuit of direct current
3 have included induction coil Core1, induction coil Core2, amplifier IC1, amplifier IC2, pass through the two-way detection of electrical leakage electricity of direct current
Road 3 detects the electric leakage situation of direct current electric bipolar, and the electric leakage signal detected is transferred into arithmetic processing circuit 8, calculation process
The control power-off execution circuit 4 of circuit 8 is cut off the electricity supply, and plays leakage protection；After eliminating electric leakage, recovered by reset circuit 9
Work.
Example IV：
As shown in fig. 6, direct current variable-current circuit 2 is rectifier bridge, the two-way electric-leakage detection circuit 3 of direct current is by a sensing
Coil Core1, a dual power supply amplifier IC1 composition.
The two-way electric-leakage detection circuit 3 of direct current is the induction coil being set in the output end of direct current variable-current circuit 2
Core1, induction coil Core1 output ends are connected with arithmetic processing circuit 8, and the arithmetic processing circuit 8 includes amplifier
IC1, the first latch 1, triode Q2, triode Q3, amplifier IC1 electrode input ends by resistance R13 respectively with resistance R12
The output ends of induction coil Core1 mono- connect in one end, the two-way electric-leakage detection circuit 3 of direct current, amplifier IC1 negative inputs difference
Output end another with induction coil Core1 in the resistance R12 other ends, electric capacity C11 one end, the two-way electric-leakage detection circuit 3 of direct current connects
Connect, electric capacity C11 other ends ground connection, amplifier IC1 cathode power supplies input is connected with power supply VCC, and amplifier IC1 negative power supplies are defeated
Entering end to be connected with power supply-VCC, amplifier IC1 output ends are connected with diode D4 positive terminals, diode D5 negative pole ends respectively, and two
Pole pipe D4 negative pole ends are connected with triode Q3 colelctor electrodes, the input of the first latch 1 respectively, triode Q3 base stages respectively with electricity
R17 one end, the connection of resistance R18 one end are hindered, the resistance R18 other ends, triode Q3 emitter stages are grounded respectively, the resistance R17 other ends
It is connected with triode Q2 colelctor electrodes, triode Q2 base stages are grounded by resistance R14, and triode Q2 emitter stages and diode D5 are just
Extreme connection, the output end of first memory 1 are connected with power-off execution circuit 4.
Operation principle：Direct current variable-current circuit 2 is that rectifier bridge produces pulsating direct current, the two-way electric-leakage detection circuit 3 of direct current
Inside contain an induction coil Core1, a dual power supply amplifier IC1, direct current is detected by the two-way electric-leakage detection circuit 3 of direct current
The electric leakage situation of electric bipolar, and the electric leakage signal detected is transferred to arithmetic processing circuit 8, the control of arithmetic processing circuit 8 is disconnected
Electric execution circuit 4 is cut off the electricity supply, and plays leakage protection；After eliminating electric leakage, resumed work by reset circuit 9.
Embodiment five：
As shown in fig. 7, direct current variable-current circuit 2 is made up of diode D3 and transformer secondary output, the two-way electric leakage of direct current is visited
Slowdown monitoring circuit 3 is made up of an induction coil Core1, positive and negative amplifier IC1, IC2.
The two-way electric-leakage detection circuit 3 of direct current is the sensing being set in the transformer output end of main power conversion circuit 6
Coil Core1, induction coil Core1 output ends are connected with arithmetic processing circuit 8, and the arithmetic processing circuit 8 includes amplification
Device IC1, amplifier IC2, the first latch 1, the second latch 2, OR gate 1, amplifier IC1 output ends and the first latch 1 are defeated
Enter end connection, amplifier IC1 negative inputs are electric with resistance R12 one end, the two-way detection of electrical leakage of direct current respectively by resistance R13
In road 3 output ends of induction coil Core1 mono- connect, amplifier IC1 electrode input ends respectively with the resistance R12 other ends, electric capacity
Another output end connections of induction coil Core1 in C11 one end, the two-way electric-leakage detection circuit 3 of direct current, electric capacity C11 other ends ground connection,
The input of OR gate 1 one is connected with the output end of the first latch 1, and amplifier IC2 output ends are connected with the input of the second latch 2,
Amplifier IC2 negative inputs are connected with resistance R10 one end, amplifier IC1 electrode input ends respectively by resistance R11, amplification
Device IC2 electrode input ends are connected with the resistance R10 other ends, electric capacity C10 one end, amplifier IC1 negative inputs respectively, electric capacity
The C10 other ends are grounded, and 1 another input of OR gate is connected with the output end of the second latch 2, and the output end of OR gate 1 performs electricity with power-off
Road 4 connects, and amplifier IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the cathode power supply of the first latch 1 are defeated
Enter end, the cathode power supply input of the second latch 2 is connected with VCC power supplys respectively, amplifier IC1 negative power supplies input, amplification
Device IC2 negative power supplies input, the negative power supply input of the first latch 1, the negative power supply input of the second latch 2 connect respectively
Ground.
Operation principle：Direct current variable-current circuit 2 is that commutation diode produces pulsating direct current, the two-way electric leakage detection electricity of direct current
Containing an induction coil Core1, amplifier IC1, amplifier IC2 in road 3, detected by the two-way electric leakage detection circuit 3 of direct current
The electric leakage situation of direct current electric bipolar, and the electric leakage signal detected is transferred to arithmetic processing circuit 8, arithmetic processing circuit 8 is controlled
System power-off execution circuit 4 is cut off the electricity supply, and plays leakage protection；After eliminating electric leakage, resumed work by reset circuit 9.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (10)
- A kind of 1. power transformer with DC leakage protection, it is characterised in that：Include shell (100), the shell (100) It is interior provided with the power input interface (1) electrically connected with city, the power input interface (1) be sequentially connected with for by alternating current turn It is changed to the direct current variable-current circuit (2) of direct current, the two-way electric-leakage detection circuit of direct current (3), power-off execution circuit (4), filtering Circuit (5), main power conversion circuit (6) and the power output interface (7) being connected with electrical appliance, the two-way electric leakage inspection of direct current It is also associated with being used to detect electric leakage in the two-way electric-leakage detection circuit of direct current (3) between slowdown monitoring circuit (3) and power-off execution circuit (4) When control power-off execution circuit (4) disconnect arithmetic processing circuit (8).
- A kind of 2. power transformer with DC leakage protection according to claim 1, it is characterised in that：The power-off is held Row circuit (4) is connected with reset circuit (9), the two-way electric-leakage detection circuit of direct current (3) and arithmetic processing circuit (8) respectively with In-line power circuit (10) connects.
- A kind of 3. power transformer with DC leakage protection according to claim 1, it is characterised in that：The direct current is double To electric-leakage detection circuit (3) for be set on direct current variable-current circuit (2) or direct current variable-current circuit (2) output end on, The two-way electric-leakage detection circuit of direct current (3) is that may detect the electronic device that the negative or positive electrode of direct current leaks electricity, electronics device Part is coil electromagnetism induction coupling or photoelectrical coupler.
- A kind of 4. power transformer with DC leakage protection according to claim 1, it is characterised in that：The direct current is double It is to be set in induction coil Core1 in direct current variable-current circuit (2) output end, induction coil to electric-leakage detection circuit (3) Core1 output ends are connected with arithmetic processing circuit (8), and the arithmetic processing circuit (8) includes amplifier IC1, amplifier IC2, the first latch 1, the second latch 2, OR gate 1, amplifier IC1 output ends are connected with the input of the first latch 1, amplification Device IC1 negative inputs by resistance R13 respectively with induction coil in resistance R12 one end, the two-way electric-leakage detection circuit of direct current (3) The output ends of Core1 mono- connect, and amplifier IC1 electrode input ends are two-way with the resistance R12 other ends, electric capacity C11 one end, direct current respectively Another output end connections of induction coil Core1, electric capacity C11 other ends ground connection, the input of OR gate 1 one in electric-leakage detection circuit (3) It is connected with the output end of the first latch 1, amplifier IC2 output ends are connected with the input of the second latch 2, amplifier IC2 negative poles Input is connected with resistance R10 one end, amplifier IC1 electrode input ends respectively by resistance R11, the input of amplifier IC2 positive poles End is connected with the resistance R10 other ends, electric capacity C10 one end, amplifier IC1 negative inputs respectively, electric capacity C10 other ends ground connection, 1 another input of OR gate is connected with the output end of the second latch 2, and the output end of OR gate 1 is connected with power-off execution circuit (4), is amplified Device IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the cathode power supply input of the first latch 1, the second lock The cathode power supply input of storage 2 is connected with VCC power supplys respectively, amplifier IC1 negative power supplies input, amplifier IC2 negative electricities Source input, the negative power supply input of the first latch 1, the negative power supply input of the second latch 2 are grounded respectively.
- A kind of 5. power transformer with DC leakage protection according to claim 1, it is characterised in that：The direct current is double It is to be set in induction coil Core1 in direct current variable-current circuit (2) output end, induction coil to electric-leakage detection circuit (3) Core1 output ends are connected with arithmetic processing circuit (8), and the arithmetic processing circuit (8) includes amplifier IC1 and first and latched Device 1, amplifier IC1 output ends are connected with the input of the first latch 1, and amplifier IC1 negative inputs are distinguished by resistance R13 It is connected with the output ends of induction coil Core1 mono- in resistance R12 one end, the two-way electric-leakage detection circuit of direct current (3), amplifier IC1 is just Pole input respectively with induction coil in the resistance R12 other ends, electric capacity C11 one end, the two-way electric-leakage detection circuit of direct current (3) Another output end connections of Core1, electric capacity C11 other ends ground connection, the output end of the first latch 1 are connected with power-off execution circuit (4), Amplifier IC1 cathode power supplies input, the cathode power supply input of the first latch 1 are connected with power supply VCC respectively, amplifier IC1 Negative power supply input, the negative power supply input of the first latch 1 are grounded respectively.
- A kind of 6. power transformer with DC leakage protection according to claim 1, it is characterised in that：The direct current is double Include to electric-leakage detection circuit (3) the induction coil Core1 that is respectively sleeved in direct current variable-current circuit (2) output end and Induction coil Core2, induction coil Core1 and induction coil Core2 output end are connected with arithmetic processing circuit (8) respectively, institute State arithmetic processing circuit (8) and include amplifier IC1, amplifier IC2, the first latch 1, the second latch 2, OR gate 1, amplify Device IC1 output ends are connected with the input of the first latch 1, amplifier IC1 negative inputs by resistance R13 respectively with resistance The output ends of induction coil Core1 mono- connect in R12 one end, the two-way electric-leakage detection circuit of direct current (3), the input of amplifier IC1 positive poles End is another with induction coil Core1 in the resistance R12 other ends, electric capacity C11 one end, the two-way electric-leakage detection circuit of direct current (3) respectively Output end is connected, and electric capacity C11 other ends ground connection, the input of OR gate 1 one is connected with the output end of the first latch 1, and amplifier IC2 is defeated Go out end be connected with the input of the second latch 2, amplifier IC2 negative inputs by resistance R11 respectively with resistance R10 one end, In the two-way electric-leakage detection circuit of direct current (3) output ends of induction coil Core2 mono- connect, amplifier IC2 electrode input ends respectively with Another output ends of induction coil Core2 connect in the resistance R10 other ends, electric capacity C10 one end, the two-way electric-leakage detection circuit of direct current (3) Connect, electric capacity C10 other ends ground connection, 1 another input of OR gate is connected with the output end of the second latch 2, the output end of OR gate 1 and power-off Execution circuit (4) connects, and amplifier IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the first latch 1 are just Pole power input, the cathode power supply input of the second latch 2 are connected with VCC power supplys respectively, the input of amplifier IC1 negative power supplies End, the input of amplifier IC2 negative power supplies input, the negative power supply input of the first latch 1, the negative power supply of the second latch 2 End is grounded respectively.
- A kind of 7. power transformer with DC leakage protection according to claim 1, it is characterised in that：The direct current is double It is to be set in induction coil Core1 in direct current variable-current circuit (2) output end, induction coil to electric-leakage detection circuit (3) Core1 output ends are connected with arithmetic processing circuit (8), and the arithmetic processing circuit (8) includes amplifier IC1, the first latch Device 1, triode Q2, triode Q3, amplifier IC1 electrode input ends are double with resistance R12 one end, direct current respectively by resistance R13 Into electric-leakage detection circuit (3) output ends of induction coil Core1 mono- connect, amplifier IC1 negative inputs respectively with resistance R12 Another output end connections of induction coil Core1, electric capacity in the other end, electric capacity C11 one end, the two-way electric-leakage detection circuit of direct current (3) The C11 other ends are grounded, and amplifier IC1 cathode power supplies input is connected with power supply VCC, amplifier IC1 negative power supplies input and Power supply-VCC connections, amplifier IC1 output ends are connected with diode D4 positive terminals, diode D5 negative pole ends respectively, diode D4 Negative pole end is connected with triode Q3 colelctor electrodes, the input of the first latch 1 respectively, triode Q3 base stages respectively with resistance R17 mono- End, the connection of resistance R18 one end, the resistance R18 other ends, triode Q3 emitter stages are grounded respectively, the resistance R17 other ends and triode Q2 colelctor electrodes are connected, and triode Q2 base stages are grounded by resistance R14, and triode Q2 emitter stages are connected with diode D5 positive terminals, The output end of first memory 1 is connected with power-off execution circuit (4).
- A kind of 8. power transformer with DC leakage protection according to claim 1, it is characterised in that：The direct current is double It is the induction coil Core1 being set in main power conversion circuit (6) transformer output end to electric-leakage detection circuit (3), senses Coil Core1 output ends are connected with arithmetic processing circuit (8), and the arithmetic processing circuit (8) includes amplifier IC1, amplification Device IC2, the first latch 1, the second latch 2, OR gate 1, amplifier IC1 output ends are connected with the input of the first latch 1, put Big device IC1 negative inputs by resistance R13 respectively with the line of induction in resistance R12 one end, the two-way electric-leakage detection circuit of direct current (3) The connection of the output ends of Core1 mono- is enclosed, amplifier IC1 electrode input ends are double with the resistance R12 other ends, electric capacity C11 one end, direct current respectively Into electric-leakage detection circuit (3), another output end connections of induction coil Core1, electric capacity C11 other ends ground connection, OR gate 1 one input End is connected with the output end of the first latch 1, and amplifier IC2 output ends are connected with the input of the second latch 2, and amplifier IC2 is born Pole input is connected with resistance R10 one end, amplifier IC1 electrode input ends respectively by resistance R11, and amplifier IC2 positive poles are defeated Enter end to be connected with the resistance R10 other ends, electric capacity C10 one end, amplifier IC1 negative inputs respectively, another terminations of electric capacity C10 Ground, 1 another input of OR gate are connected with the output end of the second latch 2, and the output end of OR gate 1 is connected with power-off execution circuit (4), is put Big device IC1 cathode power supplies input, amplifier IC2 cathode power supplies input, the cathode power supply input of the first latch 1, second The cathode power supply input of latch 2 is connected with VCC power supplys respectively, amplifier IC1 negative power supplies input, amplifier IC2 negative poles Power input, the negative power supply input of the first latch 1, the negative power supply input of the second latch 2 are grounded respectively.
- A kind of 9. power transformer with DC leakage protection according to claim 1, it is characterised in that：The power-off is held Row circuit (4) is relay or electrical apparatus release.
- A kind of 10. power transformer with DC leakage protection according to claim 1, it is characterised in that：The computing Process circuit (8) is analog operational circuit or/and digital operational circuit.
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| CN109541287A (en) * | 2018-12-29 | 2019-03-29 | 天津康途科技有限公司 | A kind of leak current detection device |
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