CN210200530U - Current transformer based on PCB hollow coil - Google Patents
Current transformer based on PCB hollow coil Download PDFInfo
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- CN210200530U CN210200530U CN201920840704.8U CN201920840704U CN210200530U CN 210200530 U CN210200530 U CN 210200530U CN 201920840704 U CN201920840704 U CN 201920840704U CN 210200530 U CN210200530 U CN 210200530U
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Abstract
The utility model discloses a current transformer based on PCB hollow coil, which comprises a plastic insulating PCB bracket, a first double-sided PCB, a second double-sided PCB, a copper bar and a PCB connecting pin; the first double-sided PCB and the second double-sided PCB are respectively tightly attached to the upper surface and the lower surface of the plastic insulating PCB support; the copper bar is fixedly arranged on the mounting slot of the plastic insulation PCB bracket; the first double-sided PCB and the second double-sided PCB are connected through a PCB connecting pin; the upper surface plate and the lower surface plate of the first double-sided PCB and the second double-sided PCB are respectively provided with an upper planar coil and a lower planar coil, the planar coils on the first double-sided PCB and the second double-sided PCB are connected in series and then are connected to an integrating circuit on the first double-sided PCB, and the differential signals are integrated and restored to form current signals to be output. The technical scheme of the utility model can be through converting the great side alternating current that once of numerical value to the less secondary side alternating current of numerical value, avoided mutual-inductor magnetic saturation phenomenon, measure dynamic range big, the measurement is accurate.
Description
Technical Field
The utility model belongs to smart electric meter equipment field, concretely relates to current transformer based on PCB air core coil.
Background
The AC current transformer can convert the primary side AC current with larger value into the secondary AC current with smaller value through a certain transformation ratio, and is used for the purposes of electricity stealing prevention, measurement and the like of the multifunctional electronic watch. The traditional alternating current transformer mostly adopts magnetic core coupling, when large current passes through, the magnetic core is easy to saturate to cause inaccurate metering, and the transformer designed by the hollow coil has the characteristics of no magnetic saturation and large measurement dynamic range, so that the alternating current transformer taking the hollow coil as a sensing element is widely concerned.
Disclosure of Invention
For solving the above problem, an object of the utility model is to provide a current transformer based on PCB air core coil, this current transformer can be the great side alternating current that once of numerical value through converting to the less secondary side alternating current of numerical value, has avoided mutual-inductor magnetic saturation phenomenon, and it is big to measure dynamic range, and the measurement is accurate.
In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a current transformer based on hollow coil of PCB, includes plastic insulation PCB support, its characterized in that: the current transformer further comprises a first double-sided PCB, a second double-sided PCB, a copper bar and a PCB connecting pin;
the first double-sided PCB and the second double-sided PCB are respectively arranged above and below the plastic insulating PCB support, the first double-sided PCB is tightly attached to the upper surface of the plastic insulating PCB support, and the second double-sided PCB is tightly attached to the lower surface of the plastic insulating PCB support; a mounting slot is formed in the middle of the plastic insulation PCB support, and the copper bar is fixedly mounted on the mounting slot; the copper bar is electrically isolated from the first double-sided PCB and the second double-sided PCB through plastic insulation PCB supports respectively; a plurality of pin holes are formed in the peripheral edges of the first double-sided PCB and the second double-sided PCB, PCB connecting pins are mounted in the pin holes, and the first double-sided PCB and the second double-sided PCB are connected through the PCB connecting pins;
the upper surface plate and the lower surface plate of the first double-sided PCB and the second double-sided PCB are both provided with a planar coil, the planar coil comprises an upper planar coil and a lower planar coil, and both adopt spiral wiring design; the upper planar coil and the lower planar coil comprise four planar rectangular spiral coils; the upper planar coil comprises a first upper planar rectangular spiral coil, a second upper planar rectangular spiral coil, a third upper planar rectangular spiral coil and a fourth upper planar rectangular spiral coil; the lower planar coil comprises a first lower planar rectangular spiral coil, a second lower planar rectangular spiral coil, a third lower planar rectangular spiral coil and a fourth lower planar rectangular spiral coil; the center C of the first upper plane rectangular spiral coil penetrates through the hole and then is connected with the center C 'of the first lower plane rectangular spiral coil, the center B of the second upper plane rectangular spiral coil penetrates through the hole and then is connected with the center B' of the second lower plane rectangular spiral coil, the center A of the third upper plane rectangular spiral coil penetrates through the hole and then is connected with the center A 'of the third lower plane rectangular spiral coil, and the center D of the fourth upper plane rectangular spiral coil penetrates through the hole and then is connected with the center D' of the fourth lower plane rectangular spiral coil; the incoming wire spirally runs from a wire incoming end G at the right starting point of the first double-sided PCB upper plane coil to a first upper plane rectangular spiral coil in a counterclockwise direction to a center C, enters a position C 'of the first lower plane rectangular spiral coil of the first double-sided PCB lower plane coil from the C through a hole, then completes the first lower plane rectangular spiral coil through the counterclockwise spiral running, is connected to the second lower plane rectangular spiral coil in series, runs to a position B' of the center of the second lower plane rectangular spiral coil in a clockwise direction, passes through a position B of the center of the second upper plane rectangular spiral coil of the first double-sided PCB upper plane coil, completes the second upper plane rectangular spiral coil through the clockwise spiral running, is connected with a third upper plane rectangular spiral coil of the first double-sided PCB upper plane coil, runs to a position A 'of the third upper plane rectangular spiral coil in a counterclockwise direction, and enters a position A' of the third lower plane rectangular spiral coil of the first double-sided PCB lower plane coil through a hole, finishing a third lower plane rectangular spiral coil from A 'and then anticlockwise spirally routing, then connecting a fourth lower plane rectangular spiral coil, clockwise routing to a center D', passing through a hole to a center D point of a fourth upper plane rectangular spiral coil of the first double-sided PCB upper plane coil, clockwise spirally routing from the D point to a pad E point, connecting the pad E point to a wire inlet end E 'of a second double-sided PCB upper surface plate through a PCB connecting pin in a pin hole, wherein the routing direction and the connection mode of the plane coil on the second double-sided PCB are completely the same as those of the first double-sided PCB, and the wire inlet is formed by connecting the first upper plane rectangular spiral coil, the first lower plane rectangular spiral coil, the second upper plane rectangular spiral coil and the third upper plane rectangular spiral coil on the second double-sided PCB in series from the wire inlet end E' of the second double-sided PCB upper surface plate, After the third lower plane rectangular spiral coil, the fourth lower plane rectangular spiral coil and the fourth upper plane rectangular spiral coil reach a pad F 'point on the second double-sided PCB, the pad F' point is connected to a wire outlet end F of the first double-sided PCB upper surface plate through a PCB connecting pin in a pin hole;
an integrating circuit is arranged on the upper surface plate of the first double-sided PCB; the integrating circuit comprises a chip U1, resistors R1 and Ra, a feedback resistor R2 and a feedback capacitor C; the chip U1 is a low-noise non-chopper zero-stabilized bipolar operational amplifier integrated circuit with the model number of OP 07; one end of the resistor Ra is connected with a wire inlet end G of the planar coil on the first double-sided PCB2, the other end of the resistor Ra is connected with a wire outlet end F of the planar coil on the first double-sided PCB, and the wire outlet end F is connected with a pin 3 of a forward input end of a chip U1; one end of the resistor R1 is connected with a wire inlet end G of the planar coil, the other end of the resistor R1 is connected with a pin 2 of the reverse input end of the chip U1, the resistor R2 and the capacitor C are connected between a pin 2 of the chip U1 and a pin 6 of the signal output end in parallel, and a pin 4 of the chip U1 is connected with a pin 3 of the positive input end and is grounded; the output signal of the planar coil is a differential signal, the differential signal is integrated through an integrating circuit to restore a current signal, and the current signal is output through a pin 6 of a signal output end of the chip U1.
The shape of the copper bar is U-shaped.
In the above technical solution, the current transformer of the present invention has two double-sided PCBs, each of the two double-sided PCBs is provided with serially connected planar coils, the incoming line of the planar coil is spirally routed from the incoming line end G of the right side of the planar coil on the first double-sided PCB to the center C of the first upper planar rectangular spiral coil in an anticlockwise manner, the incoming line of the planar coil is passed through the hole C to the C 'of the first lower planar rectangular spiral coil of the first double-sided PCB lower planar coil, then the anticlockwise spiral is routed to complete the first lower planar rectangular spiral coil, and then serially connected to the second lower planar rectangular spiral coil, and is clockwise routed to the center B' of the second lower planar rectangular spiral coil, passed through the hole B to the center B of the second upper planar rectangular spiral coil of the first double-sided PCB upper planar coil, the second upper planar rectangular spiral coil is completed in an clockwise spiral manner, and then the third upper planar rectangular spiral coil of the first double-sided PCB upper planar coil is, according to the method, the wire is wound to the center A of a third upper plane rectangular spiral coil in a counterclockwise way, the wire enters the A ' position of the third lower plane rectangular spiral coil of the first double-sided PCB lower plane coil through a hole, the third lower plane rectangular spiral coil is completed through the A ' position and then the counterclockwise spiral wire, the fourth lower plane rectangular spiral coil is connected, according to the clockwise wire winding to the D ' position, the wire is wound to the center D point of the fourth upper plane rectangular spiral coil of the first double-sided PCB upper plane coil through the hole, the clockwise spiral wire winding from the D point reaches the pad E point, the pad E point is connected to the wire inlet end E ' of the second double-sided PCB upper surface panel through a PCB connecting pin in a pin hole, the wire winding direction and the connecting mode of the planar coil on the second double-sided PCB upper surface panel are completely the same as those of the first double-sided PCB, and the wire inlet is connected in series from the wire inlet end E ' of the second double-, After the first lower plane rectangular spiral coil, the second upper plane rectangular spiral coil, the third lower plane rectangular spiral coil, the fourth lower plane rectangular spiral coil and the fourth upper plane rectangular spiral coil reach a pad F 'point on the second double-sided PCB, the pad F' point is connected to a wire outlet end F of the upper surface plate of the first double-sided PCB through a PCB connecting pin in a pin hole; an integrating circuit is connected between the wire inlet end G and the wire outlet end F, the planar coil outputs differential signals, and the differential signals are integrated and restored through the integrating circuit to output current signals. The utility model discloses can be the great side alternating current that once of numerical value through converting to the less secondary side alternating current of numerical value, avoided mutual-inductor magnetic saturation phenomenon, measure dynamic range big, the measurement is accurate.
Drawings
Fig. 1 is a schematic perspective view of a current transformer based on a PCB air-core coil according to the present invention;
FIG. 2 is a schematic diagram of the exploded structure of FIG. 1;
fig. 3 is a schematic diagram of a coil wiring structure on the upper and lower surfaces of a first double-sided PCB in a PCB air-core coil-based current transformer of the present invention;
fig. 4 is a schematic diagram of a coil wiring structure on the upper and lower surfaces of a second double-sided PCB in the PCB air-core coil-based current transformer of the present invention;
fig. 5 is a schematic structural view of a plastic insulating PCB support in a PCB air-core coil-based current transformer of the present invention;
fig. 6 is a schematic structural diagram of a copper bar in the PCB air-core coil-based current transformer of the present invention;
fig. 7 is a schematic circuit diagram of an integrating circuit in a current transformer based on a PCB air-core coil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description is made in conjunction with the drawings and the examples, and the present invention is described in further detail with reference to the current transformer based on the PCB air-core coil. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As can be seen from fig. 1 to 7, the PCB air-core coil-based current transformer of the present embodiment includes a plastic insulating PCB support 1, a first double-sided PCB2, a second double-sided PCB3, a copper bar 4, and a PCB connection pin 5.
As can be seen from fig. 1, 2, 5 and 6, the first dual-sided PCB2 and the second dual-sided PCB3 of the present embodiment are respectively disposed above and below the plastic-insulated PCB support 1, the first dual-sided PCB2 of the present embodiment is tightly attached to the upper surface of the plastic-insulated PCB support 1, and the second dual-sided PCB3 is tightly attached to the lower surface of the plastic-insulated PCB support 1. A mounting slot hole 7 is formed in the middle of the plastic insulation PCB support 1, and the copper bar 4 is fixedly mounted on the mounting slot hole 7; the copper bars 4 are electrically isolated from the first and second double- sided PCBs 2 and 3, respectively, by the plastic-insulated PCB support 1. The peripheral edges of the first double-sided PCB2 and the second double-sided PCB3 of the present embodiment are provided with a plurality of pin holes 9, the pin holes 9 are provided with PCB connecting pins 5, and the first double-sided PCB2 and the second double-sided PCB3 are connected through the PCB connecting pins 5. The copper bar 4 of the present embodiment has a "U" shape.
As can be seen from fig. 3 and 4, the planar coils 6 are disposed on the upper surface plate and the lower surface plate of the first dual-sided PCB2 and the second dual-sided PCB3 of the present embodiment, and the planar coils 6 of the present embodiment include an upper planar coil and a lower planar coil, which are both designed by spiral wiring. The upper planar coil and the lower planar coil of the present embodiment each include four planar rectangular spiral coils, and the upper planar coil includes a first upper planar rectangular spiral coil 61, a second upper planar rectangular spiral coil 62, a third upper planar rectangular spiral coil 63, and a fourth upper planar rectangular spiral coil 64. The lower planar coils include a first lower planar rectangular spiral coil 71, a second lower planar rectangular spiral coil 72, a third lower planar rectangular spiral coil 73, and a fourth lower planar rectangular spiral coil 74. The center C of the first upper planar rectangular spiral coil 61 of the present embodiment is connected to the center C 'of the first lower planar rectangular spiral coil 71 after passing through the hole, the center B of the second upper planar rectangular spiral coil 62 is connected to the center B' of the second lower planar rectangular spiral coil 72 after passing through the hole, the center a of the third upper planar rectangular spiral coil 63 is connected to the center a 'of the third lower planar rectangular spiral coil 73 after passing through the hole, and the center D of the fourth upper planar rectangular spiral coil 64 is connected to the center D' of the fourth lower planar rectangular spiral coil 74 after passing through the hole. The incoming line of the present embodiment spirally travels counterclockwise from the incoming line end G at the right starting point of the planar coil on the first double-sided PCB2 to the center C of the first upper planar rectangular spiral coil 61, passes through the hole from C to the C 'of the first lower planar rectangular spiral coil 71 of the lower planar coil of the first double-sided PCB2, then spirally travels counterclockwise to complete the first lower planar rectangular spiral coil 71, then connects to the second lower planar rectangular spiral coil 72, travels clockwise to the center B' of the second lower planar rectangular spiral coil 72, passes through the hole to the center B of the second upper planar rectangular spiral coil 62 of the planar coil on the first double-sided PCB2, completes the second upper planar rectangular spiral coil 62 as a clockwise spiral, then connects to the third upper planar rectangular spiral coil 63 of the planar coil on the first double-sided PCB2, and counterclockwise to the center a of the third upper planar rectangular spiral coil 63, a third lower planar rectangular spiral coil 73 passing through the hole into the lower planar coil of the first double-sided PCB2, a third lower planar rectangular spiral coil 73 passing from a 'then counterclockwise and spirally routed, then connected to a fourth lower planar rectangular spiral coil 74, passing through the hole to the center D' of the fourth upper planar rectangular spiral coil 64 of the planar coil on the first double-sided PCB2, passing clockwise and spirally routed from D to pad E, connected from pad E to the line incoming end E 'of the upper panel of the second double-sided PCB3 by the PCB connecting pin 5 in the pin hole 9, the planar coil on the second double-sided PCB3 of this embodiment having exactly the same routing direction and connection manner as the first double-sided PCB2, the line incoming from the line incoming E' of the upper panel of the second double-sided PCB3 along the first upper planar rectangular spiral coil 61, the line incoming end on the second double-sided PCB3 in series connection, The first lower planar rectangular spiral coil 71, the second lower planar rectangular spiral coil 72, the second upper planar rectangular spiral coil 62, the third upper planar rectangular spiral coil 63, the third lower planar rectangular spiral coil 73, the fourth lower planar rectangular spiral coil 74 and the fourth upper planar rectangular spiral coil 64 are connected to the outlet terminal F of the upper panel of the first double-sided PCB2 through the PCB connecting pin 5 in the pin hole 9 from the pad F 'point to the pad F' point on the second double-sided PCB 3.
As can be seen from fig. 1, 3 and 7, the integrating circuit 8 is disposed on the upper surface of the first double-sided PCB2 of this embodiment. The integrating circuit 8 of the present embodiment includes a chip U1, resistors R1, Ra, a feedback resistor R2, and a feedback capacitor C; the chip U1 is a low-noise non-chopper zero-stabilized bipolar operational amplifier integrated circuit with the model number of OP 07; one end of the resistor Ra is connected with a wire inlet end G of the planar coil 6 on the first double-sided PCB2, the other end of the resistor Ra is connected with a wire outlet end F of the planar coil 6 on the first double-sided PCB2, and the wire outlet end F is connected with a pin 3 of a positive input end of the chip U1; one end of the resistor R1 is connected with the incoming line end G of the planar coil 6, the other end of the resistor R1 is connected with the pin 2 of the reverse input end of the chip U1, the resistor R2 and the capacitor C are connected between the pin 2 of the chip U1 and the pin 6 of the signal output end in parallel, and the pin 4 of the chip U1 is connected with the pin 3 of the positive input end and is grounded; the output signal of the planar coil 6 is a differential signal, the differential signal is integrated by the integrating circuit 8 to restore a current signal, and the current signal is output through a pin 6 of a signal output end of the chip U1.
In this embodiment, when an alternating current flows through the primary-side copper bar 4, a flux linkage exists between the primary conductor and the planar coil 6, and when the alternating current of the primary conductor changes, the magnetic flux of the planar coil 6 of the secondary coil changes, and an electromotive force is generated. Set the coefficient between them as
The measured AC current is
Generating an electromotive force of
From faraday's law of electromagnetic induction:
. The induced voltage signal has a phase difference with the alternating current, and an integrating circuit is added in order to make the phase consistent. The whole equivalent circuit is shown in FIG. 7, in FIG. 7
In order to induce an electromotive force,
the voltage is output for the planar coil of the PCB,
respectively representing the internal resistance, coil self-inductance and stray capacitance of the planar coil 6, wherein M is the mutual inductance coefficient, and R and C are integrator parameters.
The following derivation of the output
With the AC current to be measured
The relationship of (1):
When in use
An integral operation is constructed, derived as follows
The current transformer of this embodiment is connected to the zero line or the phase terminal base of the electric meter through the copper bar 4, the first double-sided PCB2 and the second double-sided PCB3 adopt a two-coil series connection mode, and are connected to the integrating circuit on the first double-sided PCB2, because the output signal of the planar coil 6 is a differential signal, the current signal is restored by integrating the differential signal through the integrating circuit 8, and is output through the pin 6 of the signal output end of the U1. According to the embodiment, the primary side alternating current with a large value is converted into the secondary side alternating current with a small value, the magnetic saturation phenomenon of the mutual inductor is avoided, the dynamic measurement range is large, and the measurement is accurate.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. The utility model provides a current transformer based on hollow coil of PCB, includes plastic insulation PCB support (1), its characterized in that: the current transformer also comprises a first double-sided PCB (2), a second double-sided PCB (3), a copper bar (4) and a PCB connecting pin (5);
the first double-sided PCB (2) and the second double-sided PCB (3) are respectively arranged above and below the plastic insulating PCB support (1), the first double-sided PCB (2) is tightly attached to the upper surface of the plastic insulating PCB support (1), and the second double-sided PCB (3) is tightly attached to the lower surface of the plastic insulating PCB support (1); a mounting slot hole (7) is formed in the middle of the plastic insulation PCB support (1), and the copper bar (4) is fixedly mounted on the mounting slot hole (7); the copper bar (4) is electrically isolated from the first double-sided PCB (2) and the second double-sided PCB (3) through the plastic insulation PCB support (1); the PCB connector comprises a first double-sided PCB (2), a second double-sided PCB (3), a plurality of pin holes (9), PCB connecting pins (5), a plurality of PCB connecting pins (5) and a plurality of PCB connecting pins (5), wherein the first double-sided PCB (2) and the second double-sided PCB (3) are arranged on the periphery of the first double-sided PCB (2) and the second double-sided PCB (3);
the upper surface plate and the lower surface plate of the first double-sided PCB (2) and the second double-sided PCB (3) are respectively provided with a planar coil (6), the planar coils (6) comprise an upper planar coil and a lower planar coil, and spiral wiring design is adopted; the upper planar coil and the lower planar coil comprise four planar rectangular spiral coils; the upper planar coil comprises a first upper planar rectangular spiral coil (61), a second upper planar rectangular spiral coil (62), a third upper planar rectangular spiral coil (63) and a fourth upper planar rectangular spiral coil (64); the lower planar coils comprise a first lower planar rectangular spiral coil (71), a second lower planar rectangular spiral coil (72), a third lower planar rectangular spiral coil (73), and a fourth lower planar rectangular spiral coil (74); the center C of the first upper plane rectangular spiral coil (61) penetrates through the hole and is connected with the center C 'of the first lower plane rectangular spiral coil (71), the center B of the second upper plane rectangular spiral coil (62) penetrates through the hole and is connected with the center B' of the second lower plane rectangular spiral coil (72), the center A of the third upper plane rectangular spiral coil (63) penetrates through the hole and is connected with the center A 'of the third lower plane rectangular spiral coil (73), and the center D of the fourth upper plane rectangular spiral coil (64) penetrates through the hole and is connected with the center D' of the fourth lower plane rectangular spiral coil (74); the incoming line spirally routes from a line end G at the right starting point of the planar coil on the first double-sided PCB (2) to a first upper planar rectangular spiral coil (61) to a center C in a counterclockwise manner, the incoming line enters a position C 'of a first lower planar rectangular spiral coil (71) of the lower planar coil of the first double-sided PCB (2) from the C through a hole, then the first lower planar rectangular spiral coil (71) is spirally routed in the counterclockwise manner, then the incoming line is connected to a second lower planar rectangular spiral coil (72) in series, the incoming line is routed to a position B' of the center of the second lower planar rectangular spiral coil (72) in a clockwise manner, the incoming line passes through a hole to a position B of the center of a second upper planar rectangular spiral coil (62) of the upper planar coil of the first double-sided PCB (2), the second upper planar rectangular spiral coil (62) is completed according to the clockwise spiral, and then a third upper planar rectangular spiral coil (63) of the upper planar coil of, the wire is routed to the center A of a third upper plane rectangular spiral coil (63) anticlockwise, the wire passes through a hole to enter the A 'position of a third lower plane rectangular spiral coil (73) of a lower plane coil of a first double-sided PCB (2), the third lower plane rectangular spiral coil (73) is completed by the wire passing through the A' position and then the anticlockwise spiral wire, then the fourth lower plane rectangular spiral coil (74) is connected, the wire is routed to the center D 'position clockwise, the wire passes through the hole to the center D point of a fourth upper plane rectangular spiral coil (64) of the upper plane coil of the first double-sided PCB (2), the wire is spirally routed clockwise from the D point to a pad E point, the pad E point is connected to the wire inlet end E' of an upper surface panel of a second double-sided PCB (3) through a PCB connecting pin (5) in a pin hole (9), the routing direction and the connecting mode of the plane coil on the second double-sided PCB (3) are completely the same as those of the first, leading-in wires from a wire inlet end E ' of an upper surface panel of a second double-sided PCB (3) to a pad F ' point on the second double-sided PCB (3) along a first upper plane rectangular spiral coil (61), a first lower plane rectangular spiral coil (71), a second lower plane rectangular spiral coil (72), a second upper plane rectangular spiral coil (62), a third upper plane rectangular spiral coil (63), a third lower plane rectangular spiral coil (73), a fourth lower plane rectangular spiral coil (74) and a fourth upper plane rectangular spiral coil (64) which are connected in series, and connecting the pad F ' point to a wire outlet end F of the upper surface panel of the first double-sided PCB (2) through a PCB connecting pin (5) in a pin hole (9);
an integrating circuit (8) is arranged on the upper surface plate of the first double-sided PCB (2); the integrating circuit (8) comprises a chip U1, resistors R1 and Ra, a feedback resistor R2 and a feedback capacitor C; the chip U1 is a low-noise non-chopper zero-stabilized bipolar operational amplifier integrated circuit with the model number of OP 07; one end of the resistor Ra is connected with a wire inlet end G of the planar coil (6) on the first double-sided PCB (2), the other end of the resistor Ra is connected with a wire outlet end F of the planar coil (6) on the first double-sided PCB (2), and the wire outlet end F is connected with a pin 3 of a forward input end of a chip U1; one end of the resistor R1 is connected with a wire inlet end G of the planar coil (6), the other end of the resistor R1 is connected with a pin 2 of a reverse input end of the chip U1, the resistor R2 and the capacitor C are connected between the pin 2 of the chip U1 and a pin 6 of a signal output end in parallel, and a pin 4 of the chip U1 is connected with a pin 3 of a positive input end and is grounded; the output signal of the planar coil (6) is a differential signal, the differential signal is integrated through an integrating circuit (8) to restore a current signal, and the current signal is output through a pin 6 of a signal output end of a chip U1.
2. The PCB air core coil-based current transformer of claim 1, wherein: the copper bar (4) is U-shaped.
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|---|---|---|---|
| CN201920840704.8U CN210200530U (en) | 2019-06-05 | 2019-06-05 | Current transformer based on PCB hollow coil |
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| CN201920840704.8U CN210200530U (en) | 2019-06-05 | 2019-06-05 | Current transformer based on PCB hollow coil |
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| CN210200530U true CN210200530U (en) | 2020-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800977A (en) * | 2020-08-13 | 2020-10-20 | 国网福建省电力有限公司 | Layout structure of voltage transformer divider resistors based on double-layer SMT |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800977A (en) * | 2020-08-13 | 2020-10-20 | 国网福建省电力有限公司 | Layout structure of voltage transformer divider resistors based on double-layer SMT |
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