CN209767409U - Three-phase power supply and three-phase smart electric meter - Google Patents
Three-phase power supply and three-phase smart electric meter Download PDFInfo
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- CN209767409U CN209767409U CN201920686847.8U CN201920686847U CN209767409U CN 209767409 U CN209767409 U CN 209767409U CN 201920686847 U CN201920686847 U CN 201920686847U CN 209767409 U CN209767409 U CN 209767409U
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Abstract
The utility model relates to a three-phase power supply and three-phase smart electric meter, include: the device comprises a three-phase power supply input end, a direct-current voltage output end, a communication data output end, a first filter circuit, a rectifier circuit, a transformer circuit, a second filter circuit, a first isolation circuit, a second isolation circuit and a control circuit connected with the transformer circuit; the three-phase power input end is connected with the direct-current voltage output end through a first filter circuit, a rectifier circuit, a transformer circuit and a second filter circuit in sequence, the communication data output end is connected with the three-phase power input end through a first isolation circuit, and the first isolation circuit is connected with the first filter circuit through a second isolation circuit. Implement the utility model discloses can realize reducing power supply circuit to data communication's interference to guarantee the communication rate when data transmission, avoid communication to break.
Description
Technical Field
The utility model relates to a three-phase electricity power supply technique, more specifically say, relate to a three-phase power supply and three-phase smart electric meter.
Background
when the current three-phase intelligent electric meter transmits communication data, the power supply source connected with the three-phase power supply can generate interference more or less, therefore, in the transmission process of the communication data, the communication data can be interfered by the power supply, the communication speed is low due to the interference of the power supply to the communication data, and even the communication output transmission is interrupted when the environment is severe.
SUMMERY OF THE UTILITY MODEL
the to-be-solved technical problem of the utility model lies in, to the above-mentioned prior art defect of prior art, a three-phase power supply and three-phase smart electric meter is provided.
The utility model provides a technical scheme that its technical problem adopted is: constructing a three-phase power supply, comprising: the device comprises a three-phase power supply input end, a direct-current voltage output end, a communication data output end, a first filter circuit, a rectifier circuit, a transformer circuit, a second filter circuit, a first isolation circuit, a second isolation circuit and a control circuit connected with the transformer circuit;
the three-phase power input end is connected with the direct-current voltage output end through the first filter circuit, the rectifier circuit, the transformer circuit and the second filter circuit in sequence, the communication data output end is connected with the three-phase power input end through the first isolation circuit, and the first isolation circuit is connected with the first filter circuit through the second isolation circuit.
Preferably, the first isolation circuit includes a capacitor CY103 and a capacitor CY 102; and/or the second isolation circuit comprises a differential mode inductor L103 and a differential mode inductor L104;
One end of the capacitor CY103 is connected to the L line of the three-phase power input end, and the other end of the capacitor CY103 is connected to the PLCL end of the communication data output end;
One end of the capacitor CY102 is connected to the N line of the three-phase power input end, and the other end of the capacitor CY102 is connected to the PLCN end of the communication data output end;
one end of the differential mode inductor L103 is connected with an L line of the three-phase power supply input end, and the other end of the differential mode inductor L103 is connected with the first filter circuit;
one end of the differential mode inductor L104 is connected to the N line of the three-phase power input terminal, and the other end of the differential mode inductor L102 is connected to the first filter circuit.
Preferably, the second isolation circuit further includes a resistor R115 and a resistor R122, the resistor R115 is connected in parallel with the differential-mode inductor L103, and the resistor R122 is connected in parallel with the differential-mode inductor L104.
Preferably, the three-phase power supply further comprises a fuse F101, one end of the fuse F101 is connected with the L line of the three-phase power supply input end, the other end of the fuse F101 is connected with the differential mode inductor L103, and/or
The circuit also comprises a fuse F102 and a piezoresistor MOV101, wherein the fuse F102 and the piezoresistor MOV101 are connected in series and then are connected with the differential mode inductor L103 and the differential mode inductor L104.
preferably, the first filter circuit includes a common mode inductor LF101, a first end of the common mode inductor LF101 is connected to the L line of the three-phase power input end through the second isolation circuit, and a third end of the common mode inductor LF101 is connected to the N line of the three-phase power input end through the second isolation circuit.
preferably, the first filter circuit further includes a common-mode inductor LF102, a capacitor CX101, a resistor R103, a resistor R104, and a resistor R110;
A first end of the common-mode inductor LF102 is connected to a second end of the common-mode inductor LF101, a second end of the common-mode inductor LF102 is connected to a first input end of the rectifier circuit, a third end of the common-mode inductor LF102 is connected to a fourth end of the common-mode inductor LF102, and the fourth end of the common-mode inductor LF is connected to a second input end of the rectifier circuit;
one end of the capacitor CX101 is connected to the first end of the common-mode inductor LF102, and the other end of the capacitor CX101 is connected to the third end of the common-mode inductor LF 102;
The resistor R101 and the resistor R103 are connected in series and then connected to the first end of the common mode inductor LF102 and the third end of the common mode inductor LF102,
The resistor R104 and the resistor R110 are connected in series and then connected to the first end of the common mode inductor LF102 and the third end of the common mode inductor LF 102.
preferably, the filter further comprises a zero point detection circuit connected with the first filter circuit;
The zero point detection circuit comprises a resistor R120, a resistor R123, a capacitor C102, a diode D102 and an optocoupler U103;
the anode of the diode D102 is connected to the fourth end of the common-mode inductor LF101, and the cathode of the diode D102 is connected to the second end of the common-mode inductor LF101 and the first end of the common-mode inductor LF102 through the capacitor C102, the resistor R120 and the resistor R123 which are connected in series;
The anode of the light emitting diode of the optocoupler U103 is connected with the cathode of the diode D102, and the cathode of the light emitting diode of the optocoupler U103 is connected with the anode of the diode D102.
preferably, the second filter circuit includes a common mode inductor LF201, a capacitor C206 and a capacitor C207;
a first end of the common mode inductor LF201 is connected to the positive output end of the transformer circuit, a second end of the common mode inductor LF201 is connected to the positive electrode of the dc voltage output end, a third end of the common mode inductor LF201 is connected to the negative output end of the transformer circuit, and a fourth end of the common mode inductor LF201 is connected to the negative electrode of the dc voltage output end;
One end of the capacitor C206 is connected to the first end of the common mode inductor LF201, and the other end of the capacitor C206 is connected to the third end of the common mode inductor LF 201;
One end of the capacitor C207 is connected to the second end of the common mode inductor LF201, and the other end of the capacitor C207 is connected to the fourth end of the common mode inductor LF 201.
preferably, the transformation circuit comprises a transformer T101;
The primary coil of the transformer T101 comprises a first primary coil and a second primary coil, the first primary coil is provided with a first primary tap, a first coil wound in the forward direction is arranged between the in-phase end of the first primary coil and the first tap, a second coil wound in the forward direction is arranged between the first tap and the reverse end of the first primary coil,
The second primary coil is provided with a second tap, a third coil wound in the same phase direction is arranged between the second tap and the same phase end of the second primary coil, a fourth coil wound in the same direction is arranged between the NC end of the second primary coil and the second tap,
the secondary coil of the transformer T101 is a fifth coil wound in the reverse direction.
In addition, the utility model discloses still construct a three-phase smart electric meter, include above arbitrary one the three-phase power supply.
Implement the utility model discloses a three-phase power supply and three-phase smart electric meter has following beneficial effect: the interference of the power supply circuit to data communication can be reduced, so that the communication speed in data transmission is ensured, and communication interruption is avoided.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
Fig. 1 is a logic block diagram of an embodiment of a three-phase power supply of the present invention;
Fig. 2 is a schematic circuit diagram of an embodiment of a three-phase power supply of the present invention;
Fig. 3 is a schematic circuit diagram of an embodiment of the transformer of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
as shown in fig. 1, in a first embodiment of a three-phase power supply of the present invention, the three-phase power supply includes: a three-phase power input end 10, a direct-current voltage output end 60 and a communication data output end 80, as well as a first filter circuit 20, a rectifying circuit 30, a transformation circuit 40, a second filter circuit 50, a first isolation circuit 71, a second isolation circuit 72 and a control circuit 90 connected with the transformation circuit 40; the three-phase power input end 10 is connected with the direct-current voltage output end 60 through a first filter circuit 20, a rectifying circuit 30, a transforming circuit 40 and a second filter circuit 50 in sequence, the communication data output end 80 is connected with the three-phase power input end 10 through a first isolation circuit 71, and the first isolation circuit 71 is connected with the first filter circuit 20 through a second isolation circuit 72. Specifically, the three-phase power input terminal 10 includes an L line and an N line, and the communication data output terminal 80 for transmitting communication data includes a PLCN terminal and a PLCL terminal, where two data lines of the communication data are respectively transmitted to the power grid through the L line and the N line of the three-phase power, and are transmitted to the communication data receiving terminal through the power grid for processing. Meanwhile, the three-phase power is processed by the rectification circuit 30 and the transformation circuit 40 and then transmitted to the equipment inside for power supply. In order to reduce the influence of noise generated by power processing circuits such as the rectifying circuit 30 and the transforming circuit 40 behind the three-phase power input terminal 10 on communication data, the PLCN terminal and the PLCL terminal of the communication data output terminal 80 are respectively connected with the L line and the N line of the three-phase power input terminal 10 through the first isolation circuit 71, the interference of the subsequent power processing circuits on the PLCN terminal and the PLCL terminal is reduced through the first isolation circuit 71, and meanwhile, the second isolation circuit 72 connected with the first isolation circuit 71 is arranged to further reduce the interference of the subsequent power processing circuits on the PLCN terminal and the PLCL terminal. Meanwhile, low-frequency interference can be filtered by the first filter circuit 20, and high-frequency interference can be filtered by the second filter circuit 50, where the low-frequency interference and the high-frequency interference are opposite, the low-frequency interference can be frequency interference in a range from 150KHz to 30MHz, and the high-frequency interference can be frequency interference higher than 30 MHz. The control circuit 90 is connected to the transforming circuit 40 to control the output power during the transforming process.
as shown in fig. 2, in an embodiment, the first isolation circuit 71 includes a capacitor CY103 and a capacitor CY 102; in another embodiment, the second isolation circuit 72 includes a differential mode inductance L103 and a differential mode inductance L104; one end of the capacitor CY103 is connected to the L line of the three-phase power input terminal 10, and the other end of the capacitor CY103 is connected to the PLCL terminal of the communication data output terminal 80; one end of the capacitor CY102 is connected with the N line of the three-phase power input end 10, and the other end of the capacitor CY102 is connected with the PLCN end of the communication data output end 80; one end of a differential mode inductor L103 is connected with an L line of the three-phase power input end 10, and the other end of the differential mode inductor L103 is connected with a first filter circuit 20; one end of the differential mode inductor L104 is connected to the N line of the three-phase power input terminal 10, and the other end of the differential mode inductor L102 is connected to the first filter circuit 20. Specifically, the first isolation circuit 71 may be a capacitor CY103 and a capacitor CY 102. One end of the capacitor CY103 is connected to the L line of the three-phase power input terminal 10, and the other end of the capacitor CY103 is connected to the PLCL terminal of the communication data output terminal 80, so that interference of the power processing circuit to the PLCL terminal of data communication is reduced. One end of the capacitor CY102 is connected to the N line of the three-phase power input terminal 10, and the other end of the capacitor CY102 is connected to the PLCN terminal of the communication data output terminal 80, so that interference of the power processing circuit to the PLCN terminal of data communication is reduced. The second isolation circuit 72 may include a differential mode inductance L103 and a differential mode inductance L104. One end of the differential mode inductor L103 is connected with the L line of the three-phase power input end 10, and the other end of the differential mode inductor L103 is connected with the first filter circuit 20, so that the differential mode interference of the power processing circuit to the PLCN end of data communication is reduced. One end of the differential mode inductor L104 is connected to the N line of the three-phase power input terminal 10, and the other end of the differential mode inductor L102 is connected to the first filter circuit 20, so as to reduce the differential mode interference of the power processing circuit to the PLCN terminal of data communication.
Further, on the above basis, the second isolation circuit 72 further includes a resistor R115 and a resistor R122, the resistor R115 is connected in parallel with the differential-mode inductor L103, and the resistor R122 is connected in parallel with the differential-mode inductor L104. Specifically, the resistor R115 is connected in parallel with the differential-mode inductor L103, and the resistor R122 is connected in parallel with the differential-mode inductor L104, so that the impact of the loop currents of the differential-mode inductor L103 and the differential-mode inductor L104 on the power circuit can be reduced.
further, in an embodiment, the utility model discloses a three-phase power supply still includes fuse F101, and the L line of three-phase power input 10 is connected to fuse F101's one end, and differential mode inductance L103 is connected to fuse F101's the other end, in another embodiment, the utility model discloses a three-phase power supply still includes fuse F102 and piezo-resistor MOV101, connects differential mode inductance L103 and differential mode inductance L104 behind fuse F102 and the series connection of piezo-resistor MOV 101. Specifically, the fuse F101 is connected to the L line of the three-phase power input terminal 10, and protects the internal circuit from being burned out when the current is too large. The fuse F102 and the piezoresistor MOV101 realize internal lightning protection, and the internal circuit is prevented from being damaged by high current of lightning stroke.
Optionally, the first filter circuit 20 includes a common mode inductor LF101, a first end of the common mode inductor LF101 is connected to the L line of the three-phase power input terminal 10 through the second isolation circuit 72, and a third end of the common mode inductor LF101 is connected to the N line of the three-phase power input terminal 10 through the second isolation circuit 72. Specifically, the first filter circuit 20 may include a common-mode inductor LF101, and common-mode interference in the power supply processing circuit is filtered by the common-mode inductor LF 101. Here, the common mode inductor LF101 may be a vertical insert common mode inductor of T9 × 5.
Optionally, the first filter circuit 20 further includes a common-mode inductor LF102, a capacitor CX101, a resistor R103, a resistor R104, and a resistor R110; a first end of the common-mode inductor LF102 is connected to a second end of the common-mode inductor LF101, a second end of the common-mode inductor LF102 is connected to a first input end of the rectifier circuit 30, a third end of the common-mode inductor LF102 is connected to a fourth end of the common-mode inductor LF102, and the fourth end of the common-mode inductor LF is connected to a second input end of the rectifier circuit 30; one end of the capacitor CX101 is connected to the first end of the common-mode inductor LF102, and the other end of the capacitor CX101 is connected to the third end of the common-mode inductor LF 102; the resistor R101 and the resistor R103 are connected in series and then connected to the first end of the common mode inductor LF102 and the third end of the common mode inductor LF102, and the resistor R104 and the resistor R110 are connected in series and then connected to the first end of the common mode inductor LF102 and the third end of the common mode inductor LF 102. Specifically, the rectifier circuit 30 includes a rectifier bridge BD101, which corresponds to two input ends, namely a first input end and a second input end, and at the input end of the rectifier bridge BD101, the common mode interference can be further suppressed through a common mode inductor LF102 connected in parallel with the common mode inductor LF101 and a peripheral circuit of the common mode inductor LF 102. It can be understood here that the filter circuit formed by the capacitor CX101, the resistor R103, the resistor R104, the resistor R110 and the common-mode inductor LF102 can effectively suppress interference in a frequency band from 150KHz to 30 MHz. The common-mode inductor LF102 may be a filter common-mode inductor of the UU type. In the present embodiment, a connection node at which the resistor R101 and the resistor R103 are connected in series is connected to a connection node at which the resistor R104 and the resistor R110 are connected in series.
Further, the utility model discloses a three-phase power supply still includes the zero point detection circuit who is connected with first filter circuit 20; the zero detection circuit comprises a resistor R120, a resistor R123, a capacitor C102, a diode D102 and an optocoupler U103; the anode of the diode D102 is connected to the fourth end of the common-mode inductor LF101, and the cathode of the diode D102 is connected to the second end of the common-mode inductor LF101 and the first end of the common-mode inductor LF102 through the capacitor C102, the resistor R120 and the resistor R123 which are connected in series; the positive pole of the light emitting diode of the optocoupler U103 is connected with the negative pole of the diode D102, and the negative pole of the light emitting diode of the optocoupler U103 is connected with the positive pole of the diode D102. Specifically, the zero point detection circuit is connected to the first filter circuit 20, so that the first filter circuit 20 filters frequency interference generated when the zero point detection circuit operates. Specifically, a zero detection circuit is arranged between the common mode inductor LF101 and the common mode inductor LF102, so that interference of the common mode inductor LF101 and the common mode inductor LF102 on front and rear circuits is isolated.
optionally, the second filter circuit 50 includes a common mode inductor LF201, a capacitor C206, and a capacitor C207; a first end of the common mode inductor LF201 is connected to the positive output end of the transformer circuit 40, a second end of the common mode inductor LF201 is connected to the positive electrode of the direct-current voltage output end 60, a third end of the common mode inductor LF201 is connected to the negative output end of the transformer circuit 40, and a fourth end of the common mode inductor LF201 is connected to the negative electrode of the direct-current voltage output end 60; one end of the capacitor C206 is connected to the first end of the common mode inductor LF201, and the other end of the capacitor C206 is connected to the third end of the common mode inductor LF 201; one end of the capacitor C207 is connected to the second end of the common mode inductor LF201, and the other end of the capacitor C207 is connected to the fourth end of the common mode inductor LF 201. Specifically, the dc output after passing through the transforming circuit 40 includes a positive output terminal and a negative output terminal, and the transforming circuit 40 may include a transformer, wherein the in-phase terminal of the transformer outputs a positive voltage, and the reverse terminal of the transformer outputs a negative voltage, corresponding to the positive output terminal, and the negative output terminal is a ground terminal. The dc voltage output 60 includes a positive pole corresponding to the positive pole output of the transformer circuit 40 and a negative pole corresponding to the negative pole output of the transformer circuit 40. The common mode inductor LF201 is connected between the positive output end and the negative output end of the transformer circuit 40 and the positive and negative of the dc voltage output end 60, and implements high frequency common mode interference in the power processing circuit together with the capacitor C206 and the capacitor 207. In this embodiment, the common mode inductance LF201 may employ a vertical plug-in common mode inductance of T9 × 5 × 3.
optionally, as shown in fig. 2 and 3, the transformer circuit 40 includes a transformer T101, a primary coil of the transformer T101 includes a first primary coil T and a second primary coil T, the first primary coil T has a first primary tap 4, a first coil N wound in a forward direction is disposed between a same-phase end 5 of the first primary coil T and the first tap 4, a second coil N wound in a forward direction is disposed between the first tap 4 and an opposite-phase end 6 of the first primary coil T, the second primary coil T has a second tap 2, a third coil N wound in a forward direction is disposed between a same-phase end 1 of the second primary coil T and the second tap 2, a fourth coil N wound in a forward direction is disposed between an NC end of the second primary coil T and the second tap 2, the secondary coil T of the transformer T101 is a fifth coil wound in an opposite direction, in order to reduce interference inside the power supply, the coils include the first coil N, the second coil N, the third coil N, the fifth coil N and the fourth coil N, the third coil N are close-phase coil, the second coil N and the third coil N are close-phase end, the close-phase end and the fourth coil, the close-phase end of the second coil T are close-phase winding start coil, the close-winding start position of the second coil T is a coil, the close-winding start coil of the transformer T, the close-winding start coil N, the second coil T is a coil N, the close-winding start coil of the transformer T, the transformer T can be the transformer T, the close-winding start coil N can be the close-winding start coil N, the transformer T, the close-winding start coil N, the close-winding start coil of the transformer T, the close-phase-winding start coil of the transformer T, the close-winding start coil of the transformer T, the transformer T can be the transformer T, the transformer T can be the transformer T, the transformer T.
The utility model discloses a three-phase smart electric meter, including the three-phase power supply of above-mentioned arbitrary description, through the three-phase smart electric meter who contains above-mentioned three-phase power supply, can avoid carrying out communication data transmission processes such as power consumption at three-phase smart electric meter, reduce the influence to communication data.
It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. A three-phase power supply, comprising: the device comprises a three-phase power supply input end, a direct-current voltage output end, a communication data output end, a first filter circuit, a rectifier circuit, a transformer circuit, a second filter circuit, a first isolation circuit, a second isolation circuit and a control circuit connected with the transformer circuit;
the three-phase power input end is connected with the direct-current voltage output end through the first filter circuit, the rectifier circuit, the transformer circuit and the second filter circuit in sequence, the communication data output end is connected with the three-phase power input end through the first isolation circuit, and the first isolation circuit is connected with the first filter circuit through the second isolation circuit.
2. the three-phase power supply of claim 1, wherein the first isolation circuit comprises a capacitor CY103 and a capacitor CY 102; and/or the second isolation circuit comprises a differential mode inductor L103 and a differential mode inductor L104;
one end of the capacitor CY103 is connected to the L line of the three-phase power input end, and the other end of the capacitor CY103 is connected to the PLCL end of the communication data output end;
One end of the capacitor CY102 is connected to the N line of the three-phase power input end, and the other end of the capacitor CY102 is connected to the PLCN end of the communication data output end;
One end of the differential mode inductor L103 is connected with an L line of the three-phase power supply input end, and the other end of the differential mode inductor L103 is connected with the first filter circuit;
one end of the differential mode inductor L104 is connected to the N line of the three-phase power input terminal, and the other end of the differential mode inductor L102 is connected to the first filter circuit.
3. The three-phase power supply of claim 2, wherein the second isolation circuit further comprises a resistor R115 and a resistor R122, the resistor R115 is connected in parallel with the differential mode inductor L103, and the resistor R122 is connected in parallel with the differential mode inductor L104.
4. The three-phase power supply of claim 3, further comprising a fuse F101, wherein one end of the fuse F101 is connected to the L line of the three-phase power input terminal, and the other end of the fuse F101 is connected to the differential mode inductor L103, and/or
the circuit also comprises a fuse F102 and a piezoresistor MOV101, wherein the fuse F102 and the piezoresistor MOV101 are connected in series and then are connected with the differential mode inductor L103 and the differential mode inductor L104.
5. the three-phase power supply of claim 1, wherein the first filter circuit comprises a common mode inductor LF101, a first end of the common mode inductor LF101 is connected to the L line of the three-phase power input terminal through the second isolation circuit, and a third end of the common mode inductor LF101 is connected to the N line of the three-phase power input terminal through the second isolation circuit.
6. the three-phase power supply according to claim 5, wherein said first filter circuit further comprises a common mode inductor LF102, a capacitor CX101, a resistor R103, a resistor R104, and a resistor R110;
A first end of the common-mode inductor LF102 is connected to a second end of the common-mode inductor LF101, a second end of the common-mode inductor LF102 is connected to a first input end of the rectifier circuit, a third end of the common-mode inductor LF102 is connected to a fourth end of the common-mode inductor LF102, and the fourth end of the common-mode inductor LF is connected to a second input end of the rectifier circuit;
One end of the capacitor CX101 is connected to the first end of the common-mode inductor LF102, and the other end of the capacitor CX101 is connected to the third end of the common-mode inductor LF 102;
the resistor R101 and the resistor R103 are connected in series and then connected to the first end of the common mode inductor LF102 and the third end of the common mode inductor LF102,
The resistor R104 and the resistor R110 are connected in series and then connected to the first end of the common mode inductor LF102 and the third end of the common mode inductor LF 102.
7. The three-phase power supply according to claim 6, further comprising a zero point detection circuit connected to said first filter circuit;
The zero point detection circuit comprises a resistor R120, a resistor R123, a capacitor C102, a diode D102 and an optocoupler U103;
the anode of the diode D102 is connected to the fourth end of the common-mode inductor LF101, and the cathode of the diode D102 is connected to the second end of the common-mode inductor LF101 and the first end of the common-mode inductor LF102 through the capacitor C102, the resistor R120 and the resistor R123 which are connected in series;
the anode of the light emitting diode of the optocoupler U103 is connected with the cathode of the diode D102, and the cathode of the light emitting diode of the optocoupler U103 is connected with the anode of the diode D102.
8. The three-phase power supply of claim 1, wherein the second filter circuit comprises a common-mode inductor LF201, a capacitor C206 and a capacitor C207;
A first end of the common mode inductor LF201 is connected to the positive output end of the transformer circuit, a second end of the common mode inductor LF201 is connected to the positive electrode of the dc voltage output end, a third end of the common mode inductor LF201 is connected to the negative output end of the transformer circuit, and a fourth end of the common mode inductor LF201 is connected to the negative electrode of the dc voltage output end;
One end of the capacitor C206 is connected to the first end of the common mode inductor LF201, and the other end of the capacitor C206 is connected to the third end of the common mode inductor LF 201;
one end of the capacitor C207 is connected to the second end of the common mode inductor LF201, and the other end of the capacitor C207 is connected to the fourth end of the common mode inductor LF 201.
9. the three-phase power supply according to any one of claims 1 to 8, wherein the transformation circuit comprises a transformer T101;
the primary coil of the transformer T101 comprises a first primary coil and a second primary coil, the first primary coil is provided with a first primary tap, a first coil wound in the forward direction is arranged between the in-phase end of the first primary coil and the first tap, a second coil wound in the forward direction is arranged between the first tap and the reverse end of the first primary coil,
the second primary coil is provided with a second tap, a third coil wound in the same phase direction is arranged between the second tap and the same phase end of the second primary coil, a fourth coil wound in the same direction is arranged between the NC end of the second primary coil and the second tap,
The secondary coil of the transformer T101 is a fifth coil wound in the reverse direction.
10. A three-phase smart meter comprising the three-phase power supply of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920686847.8U CN209767409U (en) | 2019-05-10 | 2019-05-10 | Three-phase power supply and three-phase smart electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920686847.8U CN209767409U (en) | 2019-05-10 | 2019-05-10 | Three-phase power supply and three-phase smart electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209767409U true CN209767409U (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920686847.8U Active CN209767409U (en) | 2019-05-10 | 2019-05-10 | Three-phase power supply and three-phase smart electric meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209767409U (en) |
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2019
- 2019-05-10 CN CN201920686847.8U patent/CN209767409U/en active Active
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