CN107749612B - Power transformer with DC leakage protection - Google Patents
Power transformer with DC leakage protection Download PDFInfo
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- CN107749612B CN107749612B CN201711212426.3A CN201711212426A CN107749612B CN 107749612 B CN107749612 B CN 107749612B CN 201711212426 A CN201711212426 A CN 201711212426A CN 107749612 B CN107749612 B CN 107749612B
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- 238000001514 detection method Methods 0.000 claims abstract description 82
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 79
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims description 79
- 239000003990 capacitor Substances 0.000 claims description 44
- 238000010586 diagram Methods 0.000 description 6
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method 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 power transformer with direct current leakage protection, which comprises a shell, wherein a power input interface connected with mains supply is arranged in the shell, the power input interface is sequentially connected with a direct current change current circuit for converting alternating current into direct current, a direct current bidirectional leakage detection circuit, a power-off execution circuit, a filter circuit, a main power conversion circuit and a power output interface connected with an electric appliance, an operation processing circuit for controlling the power-off execution circuit to be disconnected when the direct current bidirectional leakage detection circuit detects leakage is also connected between the direct current bidirectional leakage detection circuit and the power-off execution circuit.
Description
[ Technical field ]
The invention relates to a power transformer with direct current leakage protection.
[ Background Art ]
In the power converter and the charger, the AC power is generally converted into the dc power by the ballast bridge and the capacitor as shown in fig. 1, for example, the charger of the mobile device is changed into the dc power after the AC220 passes through the rectifier bridge and the capacitor, the dc power is relatively large with a voltage of positive electrode exceeding +110 volts and negative electrode exceeding-110 volts, when the electric leakage occurs at any one of the two electrodes, the leakage circuit breaker in the common distribution box is not necessarily triggered and protected, and the dc electric leakage is more dangerous when touching the human body.
In the existing power converter and charger, most of the output ends are independent, only a very small distance is kept between weak current of the output ends and strong current of the input ends, the distance is generally 7mm, and the output ends are not provided with other safety protection circuits, so that when the weather changes, water vapor is solidified between the weak current and the strong current, or conductive sundries or even small animals climb into the space just between the weak current and the strong current, the output ends are directly communicated with the input ends, the output ports are possibly directly connected with mains supply, and at the moment, potential safety hazards of human body electric shock exist when a human body touches the output ends.
On the other hand, the existing leakage circuit breaker can not well detect direct current leakage.
[ Summary of the invention ]
The invention overcomes the defects of the technology, provides the power transformer with the direct current leakage protection, can perform leakage detection on the bidirectional current of the positive electrode and the negative electrode of the high-voltage direct current in the power supply, controls the power-off circuit to disconnect the power supply when the leakage occurs, and improves the use safety.
The utility model provides a take direct current earth leakage protection's power transformer, includes shell 100, be equipped with in the shell 100 with mains connection's power input interface 1, power input interface 1 is connected with in order and is used for changing alternating current into direct current's direct current change current circuit 2, direct current two-way electric leakage detection circuit 3, outage execution circuit 4, filter circuit 5, main power conversion circuit 6 and with the power output interface 7 that electrical apparatus is connected, still be connected with between direct current two-way electric leakage detection circuit 3 and the outage execution circuit 4 and be used for controlling the operation processing circuit 8 that outage execution circuit 4 disconnected when direct current two-way electric leakage detection circuit 3 detects the electric leakage.
The power-off execution circuit 4 is connected with a reset circuit 9, and the direct-current bidirectional leakage detection circuit 3 and the operation processing circuit 8 are respectively connected with an internal power supply circuit 10.
The direct-current bidirectional leakage detection circuit 3 is sleeved on the direct-current variable current circuit 2 or the output end of the direct-current variable current circuit 2, the direct-current bidirectional leakage detection circuit 3 is an electronic device capable of detecting positive or negative leakage of direct current, and the electronic device is a coil electromagnetic induction coupler or a photoelectric coupler.
The DC bidirectional leakage detection circuit 3 is an induction coil Core1 sleeved on the output end of the DC variation current circuit 2, the output end of the induction coil Core1 is connected with the operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1, an amplifier IC2, a first latch 1, a second latch 2 and an OR gate 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, one input end of the OR gate 1 is connected with the output end of the first latch 1, the output end of the amplifier IC2 is connected with the input end of the second latch 2, the negative input end of the amplifier IC2 is respectively connected with one end of a resistor R10 and the positive input end of the amplifier IC1 through a resistor R11, the positive input end of the amplifier IC2 is respectively connected with the other end of the resistor R10, one end of a capacitor C10 and the negative input end of the amplifier IC1, the other end of the capacitor C10 is grounded, the other input end of the OR gate 1 is connected with the output end of the second latch 2, the output end of the OR gate 1 is connected with the power-off execution circuit 4, the positive power input end of the amplifier IC1, the positive power input end of the amplifier IC2, the positive power input end of the first latch 1 and the positive power input end of the second latch 2 are respectively connected with a power VCC, and the negative power input end of the amplifier IC1, the negative power input end of the amplifier IC2, the negative power input end of the first latch 1 and the negative power input end of the second latch 2 are respectively grounded.
The direct current bidirectional leakage detection circuit 3 is an induction coil Core1 sleeved on the output end of the direct current change current circuit 2, the output end of the induction coil Core1 is connected with the operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1 and a first latch 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, the output end of the first latch 1 is connected with the power-off execution circuit 4, the positive power input end of the amplifier IC1 and the positive power input end of the first latch 1 are respectively connected with a power supply VCC, and the negative power input end of the amplifier IC1 is respectively grounded.
The DC bidirectional leakage detection circuit 3 comprises an induction coil Core1 and an induction coil Core2 which are respectively sleeved on the output end of the DC variable current circuit 2, the output ends of the induction coil Core1 and the induction coil Core2 are respectively connected with an operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1, an amplifier IC2, a first latch 1, a second latch 2 and an OR gate 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, one input end of the OR gate 1 is connected with the output end of the first latch 1, the output end of the amplifier IC2 is connected with the input end of the second latch 2, the negative input end of the amplifier IC2 is respectively connected with one end of a resistor R10 and one output end of an induction coil Core2 in the direct current bidirectional leakage detection circuit 3 through a resistor R11, the positive input end of the amplifier IC2 is respectively connected with the other end of the resistor R10, one end of a capacitor C10 and the other output end of the induction coil Core2 in the direct current bidirectional leakage detection circuit 3, the other end of the capacitor C10 is grounded, the other input end of the OR gate 1 is connected with the output end of the second latch 2, the output end of the OR gate 1 is connected with the power-off execution circuit 4, the positive power input end of the amplifier IC1, the positive power input end of the amplifier IC2, the positive power input end of the first latch 1 and the positive power input end of the second latch 2 are respectively connected with a power VCC, the negative power input end of the amplifier IC1, the negative power input end of the amplifier IC2, the negative power input end of the first latch 1 and the negative power input end of the first latch 1, the negative power input ends of the second latches 2 are respectively grounded.
The direct current bidirectional leakage detection circuit 3 is an induction coil Core1 sleeved on the output end of the direct current change current circuit 2, the output end of the induction coil Core1 is connected with the operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1, a first latch 1, a triode Q2 and a triode Q3, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12 and one end of a capacitor C11, the other output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, the positive power input end of the amplifier IC1 is connected with a power supply VCC, the negative power input end of the amplifier IC1 is connected with a power supply VCC, the output end of the amplifier IC1 is respectively connected with the positive end of a diode D4 and the negative end of the triode D5, the negative end of the diode D4 is respectively connected with the input end of the first amplifier IC1, the negative end of the triode Q3 is respectively connected with the positive end of the triode Q2, the triode Q3 is respectively connected with one end of the resistor R17 and the negative end of the triode Q2, the triode Q2 is respectively connected with the positive end of the resistor Q2, the negative end of the triode Q2 is connected with the positive end of the triode Q2, the triode Q2 is respectively, the negative end of the triode Q2 is connected with the positive end of the triode Q2 through the positive end of the resistor R18, the positive end is respectively, the positive end is connected with the positive end of the triode Q2.
The DC bidirectional leakage detection circuit 3 is an induction coil Core1 sleeved on the output end of a transformer of the main power supply conversion circuit 6, the output end of the induction coil Core1 is connected with the operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1, an amplifier IC2, a first latch 1, a second latch 2 and an OR gate 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, one input end of the OR gate 1 is connected with the output end of the first latch 1, the output end of the amplifier IC2 is connected with the input end of the second latch 2, the negative input end of the amplifier IC2 is respectively connected with one end of a resistor R10 and the positive input end of the amplifier IC1 through a resistor R11, the positive input end of the amplifier IC2 is respectively connected with the other end of the resistor R10, one end of a capacitor C10 and the negative input end of the amplifier IC1, the other end of the capacitor C10 is grounded, the other input end of the OR gate 1 is connected with the output end of the second latch 2, the output end of the OR gate 1 is connected with the power-off execution circuit 4, the positive power input end of the amplifier IC1, the positive power input end of the amplifier IC2, the positive power input end of the first latch 1 and the positive power input end of the second latch 2 are respectively connected with a power VCC, and the negative power input end of the amplifier IC1, the negative power input end of the amplifier IC2, the negative power input end of the first latch 1 and the negative power input end of the second latch 2 are respectively grounded.
The power-off executing circuit 4 is a relay or a release.
The operation processing circuit 8 is an analog operation circuit or/and a digital operation circuit.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The beneficial effects of the invention are as follows:
According to the invention, the direct current bidirectional leakage detection circuit is used for detecting the leakage condition of the power supply, so that the safety of the power supply is greatly improved; when the electric leakage occurs, the power supply is disconnected, the electric leakage is eliminated, the electric shock of a user is avoided, and the use safety is improved.
[ Description of the drawings ]
FIG. 1 is a schematic diagram of a DC conversion circuit of a power transformer;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is a schematic diagram of a structure of an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second embodiment of the present invention;
FIG. 5 is a schematic view of a third embodiment of the present invention;
FIG. 6 is a schematic diagram of a fourth embodiment of the present invention;
Fig. 7 is a schematic diagram of a fifth embodiment of the present invention.
Detailed description of the preferred embodiments
Embodiments of the present invention are described in further detail below with reference to the attached drawings:
As shown in fig. 2, a power transformer with dc leakage protection includes a housing 100, a power input interface 1 connected to a mains supply is disposed in the housing 100, the power input interface 1 is sequentially connected with a dc change current circuit 2 for converting ac power into dc power, a dc bidirectional leakage detection circuit 3, a power-off execution circuit 4, a filter circuit 5, a main power conversion circuit 6, and a power output interface 7 connected to an electrical appliance, and an operation processing circuit 8 for controlling the power-off execution circuit 4 to be disconnected when the dc bidirectional leakage detection circuit 3 detects a leakage is further connected between the dc bidirectional leakage detection circuit 3 and the power-off execution circuit 4.
The direct-current bidirectional leakage detection circuit 3 is sleeved on the direct-current variable current circuit 2 or the output end of the direct-current variable current circuit 2, the direct-current bidirectional leakage detection circuit 3 is an electronic device capable of detecting positive or negative leakage of direct current, and the electronic device is a coil electromagnetic induction coupler or a photoelectric coupler.
The power-off execution circuit 4 is connected with a reset circuit 9, the reset circuit 9 is a mechanical device operated manually or an automatic electronic circuit or an electronic circuit operated manually, normal operation of a power transformer is recovered after electric leakage is eliminated, the direct current bidirectional electric leakage detection circuit 3 and the operation processing circuit 8 are respectively connected with an internal power supply circuit 10, and the internal power supply circuit 10 can take power from the power input interface 1, the power output interface 7 or an independent power supply.
The direct current change current circuit 5 is a circuit for generating a change direct current, and is usually composed of a rectifier bridge or a diode, the power-off executing circuit 2 is a relay or a release, the operation processing circuit 3 is an analog operation circuit or/and a digital operation circuit, and the power output interface 8 is a power interface or a USB interface.
The working principle is as follows:
The transformer works, mains supply is transmitted to the direct current change current circuit 2 through the power input interface 1, then the mains supply is converted into a power supply required by a user through the filter circuit 5 and the main power supply conversion circuit 6 and is output through the power output interface 7, during the working period of the transformer, when the direct current bidirectional leakage detection circuit 3 detects that the direct current has leakage, a leakage signal is transmitted to the operation processing circuit 8, the operation processing circuit 8 controls the power-off execution circuit 4 to work, the power supply is cut off, and the leakage protection function of an input end is achieved.
Embodiment one:
as shown in fig. 3, the direct current variable current circuit 2 is a rectifier bridge, and the direct current bidirectional leakage detection circuit 3 is composed of an induction coil Core1, an amplifier IC1, and an amplifier IC 2.
The DC bidirectional leakage detection circuit 3 is an induction coil Core1 sleeved on the output end of the DC variation current circuit 2, the output end of the induction coil Core1 is connected with the operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1, an amplifier IC2, a first latch 1, a second latch 2 and an OR gate 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, one input end of the OR gate 1 is connected with the output end of the first latch 1, the output end of the amplifier IC2 is connected with the input end of the second latch 2, the negative input end of the amplifier IC2 is respectively connected with one end of a resistor R10 and the positive input end of the amplifier IC1 through a resistor R11, the positive input end of the amplifier IC2 is respectively connected with the other end of the resistor R10, one end of a capacitor C10 and the negative input end of the amplifier IC1, the other end of the capacitor C10 is grounded, the other input end of the OR gate 1 is connected with the output end of the second latch 2, the output end of the OR gate 1 is connected with the power-off execution circuit 4, the positive power input end of the amplifier IC1, the positive power input end of the amplifier IC2, the positive power input end of the first latch 1 and the positive power input end of the second latch 2 are respectively connected with a power VCC, and the negative power input end of the amplifier IC1, the negative power input end of the amplifier IC2, the negative power input end of the first latch 1 and the negative power input end of the second latch 2 are respectively grounded.
The working principle is as follows: the direct current change current circuit 2 generates pulsating direct current for a rectifier bridge, the direct current bidirectional leakage detection circuit 1 comprises an induction coil Core1, an amplifier IC1 and an amplifier IC2, when leakage occurs, pulsating voltage and current are generated on the induction coil Core1, the amplifier IC1 and the amplifier IC2 respectively amplify the voltage and the current generated on the induction coil Core1 positively and reversely at the same time, the leakage condition of a direct current bipolar electrode is detected through the direct current bidirectional leakage detection circuit 1, the detected leakage signal is transmitted to the operation processing circuit 8, and the operation processing circuit 8 controls the power-off execution circuit 4 to cut off a power supply, so that the leakage protection function is achieved; after the leakage is eliminated, the operation is restored by the reset circuit 9.
Embodiment two:
As shown in fig. 4, the direct current variable current circuit 2 is a rectifier bridge, and the direct current bidirectional leakage detection circuit 3 is composed of an induction coil Core1 and an amplifier IC1, and the response speed of one amplifier circuit is slower than the response speed of two amplifier circuits.
The direct current bidirectional leakage detection circuit 3 is an induction coil Core1 sleeved on the output end of the direct current change current circuit 2, the output end of the induction coil Core1 is connected with the operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1 and a first latch 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, the output end of the first latch 1 is connected with the power-off execution circuit 4, the positive power input end of the amplifier IC1 and the positive power input end of the first latch 1 are respectively connected with a power supply VCC, and the negative power input end of the amplifier IC1 is respectively grounded.
The working principle is as follows: the direct current change current circuit 2 generates pulsating direct current for a rectifier bridge, the direct current bidirectional leakage detection circuit 3 internally comprises an induction coil Core1 and an amplifier IC1, when leakage occurs, pulsating voltage and current can be generated on the induction coil Core1, the single amplifier IC1 only carries out unidirectional forward or reverse amplification on the voltage and current generated on the induction coil Core1, the response time is slightly slow, the leakage condition of a direct current bipolar electrode is detected through the direct current bidirectional leakage detection circuit 3, the detected leakage signal is transmitted to the operation processing circuit 8, and the operation processing circuit 8 controls the outage execution electric 4 to cut off a power supply, so that the leakage protection effect is achieved; after the leakage is eliminated, the operation is restored by the reset circuit 9.
Embodiment III:
As shown in fig. 5, the dc variable current circuit 2 is a rectifier bridge, and the dc bidirectional leakage detection circuit 3 is composed of an induction coil Core1 and an amplifier IC1, and the response speed of one amplifier circuit is slower than the response speed of two amplifier circuits.
The DC bidirectional leakage detection circuit 3 comprises an induction coil Core1 and an induction coil Core2 which are respectively sleeved on the output end of the DC variable current circuit 2, the output ends of the induction coil Core1 and the induction coil Core2 are respectively connected with an operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1, an amplifier IC2, a first latch 1, a second latch 2 and an OR gate 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, one input end of the OR gate 1 is connected with the output end of the first latch 1, the output end of the amplifier IC2 is connected with the input end of the second latch 2, the negative input end of the amplifier IC2 is respectively connected with one end of a resistor R10 and one output end of an induction coil Core2 in the direct current bidirectional leakage detection circuit 3 through a resistor R11, the positive input end of the amplifier IC2 is respectively connected with the other end of the resistor R10, one end of a capacitor C10 and the other output end of the induction coil Core2 in the direct current bidirectional leakage detection circuit 3, the other end of the capacitor C10 is grounded, the other input end of the OR gate 1 is connected with the output end of the second latch 2, the output end of the OR gate 1 is connected with the power-off execution circuit 4, the positive power input end of the amplifier IC1, the positive power input end of the amplifier IC2, the positive power input end of the first latch 1 and the positive power input end of the second latch 2 are respectively connected with a power VCC, the negative power input end of the amplifier IC1, the negative power input end of the amplifier IC2, the negative power input end of the first latch 1 and the negative power input end of the first latch 1, the negative power input ends of the second latches 2 are respectively grounded.
The working principle is as follows: the direct current change current circuit 2 generates pulsating direct current for a rectifier bridge, the direct current bidirectional leakage detection circuit 3 comprises an induction coil Core1, an induction coil Core2, an amplifier IC1 and an amplifier IC2, the leakage condition of a direct current bipolar electrode is detected through the direct current bidirectional leakage detection circuit 3, detected leakage signals are transmitted to the operation processing circuit 8, and the operation processing circuit 8 controls the power-off execution circuit 4 to cut off a power supply, so that a leakage protection effect is achieved; after the leakage is eliminated, the operation is restored by the reset circuit 9.
Embodiment four:
As shown in fig. 6, the dc variable current circuit 2 is a rectifier bridge, and the dc bidirectional leakage detection circuit 3 is composed of an induction coil Core1 and a dual power amplifier IC 1.
The direct current bidirectional leakage detection circuit 3 is an induction coil Core1 sleeved on the output end of the direct current change current circuit 2, the output end of the induction coil Core1 is connected with the operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1, a first latch 1, a triode Q2 and a triode Q3, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12 and one end of a capacitor C11, the other output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, the positive power input end of the amplifier IC1 is connected with a power supply VCC, the negative power input end of the amplifier IC1 is connected with a power supply VCC, the output end of the amplifier IC1 is respectively connected with the positive end of a diode D4 and the negative end of the triode D5, the negative end of the diode D4 is respectively connected with the input end of the first amplifier IC1, the negative end of the triode Q3 is respectively connected with the positive end of the triode Q2, the triode Q3 is respectively connected with one end of the resistor R17 and the negative end of the triode Q2, the triode Q2 is respectively connected with the positive end of the resistor Q2, the negative end of the triode Q2 is connected with the positive end of the triode Q2, the triode Q2 is respectively, the negative end of the triode Q2 is connected with the positive end of the triode Q2 through the positive end of the resistor R18, the positive end is respectively, the positive end is connected with the positive end of the triode Q2.
Working principle: the direct current change current circuit 2 generates pulsating direct current for a rectifier bridge, the direct current bidirectional leakage detection circuit 3 comprises an induction coil Core1 and a dual power amplifier IC1, the direct current bidirectional leakage detection circuit 3 detects the leakage condition of a direct current bipolar, the detected leakage signal is transmitted to the operation processing circuit 8, and the operation processing circuit 8 controls the power-off execution circuit 4 to cut off the power supply, so that the leakage protection function is realized; after the leakage is eliminated, the operation is restored by the reset circuit 9.
Fifth embodiment:
As shown in fig. 7, the dc variable current circuit 2 is composed of a diode D3 and a transformer secondary, and the dc bidirectional leakage detection circuit 3 is composed of an induction coil Core1, and forward and reverse amplifiers IC1, IC 2.
The DC bidirectional leakage detection circuit 3 is an induction coil Core1 sleeved on the output end of a transformer of the main power supply conversion circuit 6, the output end of the induction coil Core1 is connected with the operation processing circuit 8, the operation processing circuit 8 comprises an amplifier IC1, an amplifier IC2, a first latch 1, a second latch 2 and an OR gate 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3 through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the DC bidirectional leakage detection circuit 3, the other end of the capacitor C11 is grounded, one input end of the OR gate 1 is connected with the output end of the first latch 1, the output end of the amplifier IC2 is connected with the input end of the second latch 2, the negative input end of the amplifier IC2 is respectively connected with one end of a resistor R10 and the positive input end of the amplifier IC1 through a resistor R11, the positive input end of the amplifier IC2 is respectively connected with the other end of the resistor R10, one end of a capacitor C10 and the negative input end of the amplifier IC1, the other end of the capacitor C10 is grounded, the other input end of the OR gate 1 is connected with the output end of the second latch 2, the output end of the OR gate 1 is connected with the power-off execution circuit 4, the positive power input end of the amplifier IC1, the positive power input end of the amplifier IC2, the positive power input end of the first latch 1 and the positive power input end of the second latch 2 are respectively connected with a power VCC, and the negative power input end of the amplifier IC1, the negative power input end of the amplifier IC2, the negative power input end of the first latch 1 and the negative power input end of the second latch 2 are respectively grounded.
Working principle: the direct current change current circuit 2 generates pulsating direct current for a rectifier diode, the direct current bidirectional leakage detection circuit 3 comprises an induction coil Core1, an amplifier IC1 and an amplifier IC2, the direct current bidirectional leakage detection circuit 3 detects the leakage condition of a direct current bipolar, the detected leakage signal is transmitted to the operation processing circuit 8, and the operation processing circuit 8 controls the power-off execution circuit 4 to cut off a power supply, so that the leakage protection function is realized; after the leakage is eliminated, the operation is restored by the reset circuit 9.
It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (3)
1. The utility model provides a take direct current earth leakage protection's power transformer which characterized in that: comprises a shell (100), a power input interface (1) connected with a mains supply is arranged in the shell (100), the power input interface (1) is sequentially connected with a direct current change current circuit (2) for converting alternating current into direct current, a direct current bidirectional leakage detection circuit (3), a power-off execution circuit (4), a filter circuit (5), a main power supply conversion circuit (6) and a power output interface (7) connected with an electric appliance, an operation processing circuit (8) for controlling the power-off execution circuit (4) to be disconnected when the direct current bidirectional leakage detection circuit (3) detects leakage is further connected between the direct current bidirectional leakage detection circuit (3) and the power-off execution circuit (4),
The DC bidirectional leakage detection circuit (3) is an induction coil Core1 sleeved on the output end of the DC variable current circuit (2), the output end of the induction coil Core1 is connected with an operation processing circuit (8), the operation processing circuit (8) comprises an amplifier IC1, an amplifier IC2, a first latch 1, a second latch 2 and an OR gate 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the DC bidirectional leakage detection circuit (3) through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the DC bidirectional leakage detection circuit (3), the other end of the capacitor C11 is grounded, one input end of the OR gate 1 is connected with the output end of the first latch 1, the output end of the amplifier IC2 is connected with the input end of the second latch 2, the negative input end of the amplifier IC2 is respectively connected with one end of the resistor R10 and the positive input end of the amplifier IC1 through the resistor R11, the positive input end of the amplifier IC2 is respectively connected with the other end of the resistor R10, one end of the capacitor C10 and the negative input end of the amplifier IC1, the other end of the capacitor C10 is grounded, the other input end of the OR gate 1 is connected with the output end of the second latch 2, the output end of the OR gate 1 is connected with the power-off executing circuit (4), the positive power input end of the amplifier IC1, the positive power input end of the amplifier IC2, the positive power input end of the first latch 1 and the positive power input end of the second latch 2 are respectively connected with the power VCC, the negative power supply input end of the amplifier IC1, the negative power supply input end of the amplifier IC2, the negative power supply input end of the first latch 1 and the negative power supply input end of the second latch 2 are respectively grounded;
Or the direct current bidirectional leakage detection circuit (3) comprises an induction coil Core1 and an induction coil Core2 which are respectively sleeved on the output end of the direct current change current circuit (2), the output ends of the induction coil Core1 and the induction coil Core2 are respectively connected with an operation processing circuit (8), the operation processing circuit (8) comprises an amplifier IC1, an amplifier IC2, a first latch 1, a second latch 2 and an OR gate 1, the output end of the amplifier IC1 is connected with the input end of the first latch 1, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 and one output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit (3) through a resistor R13, the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit (3), the other end of the capacitor C11 is grounded, one input end of the OR gate 1 is connected with the output end of the first latch 1, the output end of the amplifier IC2 is connected with the input end of the second latch 2, the negative input end of the amplifier IC2 is respectively connected with one end of the resistor R10 and one output end of the induction coil Core2 in the direct current bidirectional leakage detection circuit (3) through the resistor R11, the positive input end of the amplifier IC2 is respectively connected with the other end of the resistor R10, one end of the capacitor C10 and the other output end of the induction coil Core2 in the direct current bidirectional leakage detection circuit (3), the other end of the capacitor C10 is grounded, the other input end of the OR gate 1 is connected with the output end of the second latch 2, the output end of the OR gate 1 is connected with the power-off execution circuit (4), the positive power input end of the amplifier IC1, the positive power input end of the amplifier IC2, the positive power input end of the first latch 1 and the positive power input end of the second latch 2 are respectively connected with a power VCC, and the negative power input end of the amplifier IC1, the negative power input end of the amplifier IC2, the negative power input end of the first latch 1 and the negative power input end of the second latch 2 are respectively grounded;
Or the direct current bidirectional leakage detection circuit (3) is an induction coil Core1 sleeved on the output end of the direct current variable current circuit (2), the output end of the induction coil Core1 is connected with the operation processing circuit (8), the operation processing circuit (8) comprises an amplifier IC1, a first latch 1, a triode Q2 and a triode Q3, the negative input end of the amplifier IC1 is respectively connected with one end of a resistor R12 through a resistor R13, one output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit (3), the positive input end of the amplifier IC1 is respectively connected with the other end of the resistor R12, one end of a capacitor C11 and the other output end of the induction coil Core1 in the direct current bidirectional leakage detection circuit (3), the other end of the capacitor C11 is grounded, the positive power input end of the amplifier IC1 is connected with a power supply VCC, the negative power input end of the amplifier IC1 is respectively connected with a positive end and a negative end of a diode D4, the negative end of the diode D5 is respectively connected with the triode Q3, the negative end of the diode D4 is respectively connected with one end of the triode Q3, the first end of the triode Q1 is respectively connected with the triode Q2, the other end of the triode Q2 is respectively connected with the triode Q2, the triode Q2 is connected with the other end of the triode Q2, the triode Q2 is respectively connected with the other end of the triode Q2, the triode Q2 is connected with the triode Q2, the triode Q2;
The power-off execution circuit (4) is connected with a reset circuit (9), and the direct-current bidirectional electric leakage detection circuit (3) and the operation processing circuit (8) are respectively connected with an internal power supply circuit (10).
2. A power transformer with dc leakage protection according to claim 1, characterized in that: the power-off executing circuit (4) is a relay or a release.
3. A power transformer with dc leakage protection according to claim 1, characterized in that: the operation processing circuit (8) is an analog operation circuit or/and a digital operation circuit.
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| CN2728069Y (en) * | 2004-08-25 | 2005-09-21 | 田玉江 | High voltage electric leakage protector |
| CN105914706A (en) * | 2016-06-27 | 2016-08-31 | 毛春梅 | An anti-shock power transformer |
| CN207530520U (en) * | 2017-11-28 | 2018-06-22 | 毛春梅 | A power transformer with DC leakage protection |
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| CN101308185B (en) * | 2008-05-06 | 2010-10-13 | 合肥同智机电控制技术股份有限公司 | Direct current supply line electrical leakage detection circuit |
| CN201408978Y (en) * | 2009-04-24 | 2010-02-17 | 北京Abb低压电器有限公司 | Electric leakage protector |
| CN202103402U (en) * | 2011-06-21 | 2012-01-04 | 安德利集团有限公司 | Electric leakage circuit breaker |
| US20130187468A1 (en) * | 2012-01-24 | 2013-07-25 | Google Inc. | Uninterruptible power supply control in distributed power architecture |
| CN103337830B (en) * | 2013-03-21 | 2016-02-10 | 刘圣平 | The safe earth leakage protective device that a kind of fail-safe lost efficacy |
| CN103795029B (en) * | 2013-08-20 | 2016-09-07 | 深圳市金霆科技有限公司 | The leakage current test protection circuit of direct-current remote feeding power system |
| CN104931758B (en) * | 2014-03-21 | 2018-03-27 | 上海电科电器科技有限公司 | Direct current residual current detection device |
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| CN2728069Y (en) * | 2004-08-25 | 2005-09-21 | 田玉江 | High voltage electric leakage protector |
| CN105914706A (en) * | 2016-06-27 | 2016-08-31 | 毛春梅 | An anti-shock power transformer |
| CN207530520U (en) * | 2017-11-28 | 2018-06-22 | 毛春梅 | A power transformer with DC leakage protection |
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