CN210490474U - Design circuit of three-phase four-wire general filter - Google Patents
Design circuit of three-phase four-wire general filter Download PDFInfo
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- CN210490474U CN210490474U CN201920509743.XU CN201920509743U CN210490474U CN 210490474 U CN210490474 U CN 210490474U CN 201920509743 U CN201920509743 U CN 201920509743U CN 210490474 U CN210490474 U CN 210490474U
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Abstract
The utility model particularly relates to a design circuit of general wave filter of three-phase four-wire, its characterized in that: comprises a circular nickel-zinc ferrite magnetic core; the wire A, the wire B, the wire C and the wire N are wound outside the nickel-zinc ferrite magnetic core for a certain number of turns to form an inductor L, and then the inductor L and a capacitor resistor form a resonance filter circuit and are connected with equipment. The scheme can improve the performance of the filter for inhibiting common-mode conducted interference under the condition of not increasing the cost. In the method, a common-mode conducted disturbance suppression circuit is adopted; the suppression of common mode conducted interference is realized by serially connecting the Y capacitor with the metal film resistor in the filter circuit, and the energy of the common mode conducted interference is consumed by serially connecting the resistor, so that the interference of the common mode conducted interference on an external circuit is reduced.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a design circuit of a three-phase four-wire general filter.
Background
With the rapid development of electronic science and technology, the world enters the information age. Electronic and electrical devices and systems thereof are becoming more and more widely used. But with the consequent inevitable electromagnetic interference caused by electrical and electronic equipment. In daily life, people can not leave electronic equipment and various household electrical appliances which bring convenience to life more and more, but the products can generate electromagnetic interference invisibly, and the electromagnetic interference not only causes great harm to people, but also brings damage to the electronic equipment and electrical products. In the more industrially developed big cities, the more severe the electromagnetic environment is, the more the electromagnetic interference often makes the electronic, electrical equipment or system not work normally, which causes the performance of the equipment to be reduced, and even the equipment is damaged and cannot be used normally, so that a filter is needed to suppress the conducted interference.
The conducted interference can be divided into common-mode conducted interference and differential-mode interference, and the common-mode interference current is: the interference current, which is of the same amplitude/phase on all the conductors in the cable, flows in the loop formed between the cable and the ground. The current causing this disturbance is due to three reasons: (1) the external electromagnetic field induces a voltage on all the conductors in the cable (this voltage is of equal amplitude and in phase with respect to the earth), this voltage generating a current; (2) the ground voltages connected with the devices at two ends of the cable are different, and current is generated under the drive of the ground voltages; and (3) the cable on the equipment has potential difference with the ground, and the common-mode conduction current exists on the cable. As is understood by definition, the common mode current does not affect the circuit itself, but only when it is converted to a differential mode current (voltage). This occurs in the case of circuit imbalances. Differential mode interference current: the interference current flows between the signal line and the signal ground (or between the live line and the neutral line of the power line). In a signal cable, a differential mode interference current is induced in a loop formed by a signal line and a signal ground by an external electromagnetic field. Because the signal line in the cable is close to the ground wire, the area of the formed loop is small, and the differential mode current induced by the external electromagnetic field is not large. In the power line, the differential mode interference current is often generated by the power sources of other electric appliances on the power grid (especially a switching power source) and the inductive load when the inductive load is switched on and off (the amplitude of the interference current is often large). Differential mode interference currents directly affect the operation of the device.
In summary, it can be seen that there is a strong need for designing a filter for blocking high frequency carrier waves from entering the customer load and blocking customer interference signals from entering the power transmission line for improving the channel. The filter is connected with a user load in series in power carrier communication and has the capacity of blocking high frequency and passing power frequency. In the frequency range of 0.3-30MHz, the common first-stage filter has a poor suppression effect on the common mode conducted interference within 0.3-30MHz, and in order to achieve the suppression effect, two to three stages of filters are generally required to be connected in series to suppress the common mode conducted interference within 0.3-30MHz, so that the suppression effect on the common mode conducted interference can meet the requirement, but the scheme of multistage series connection has high cost and large installation space.
Disclosure of Invention
1. The technical problem to be solved is as follows:
aiming at the technical problems, the scheme provides a common three-phase four-wire general filter circuit, but can realize the suppression of common-mode conducted interference within 0.3-30MHz under the conditions of low cost and small space to meet the technical index requirements, and the scheme can basically achieve the suppression effect of two-stage filter series connection on the common-mode conducted interference within 0.3-30 MHz. The suppression of common mode conducted interference in 0.3-30MHz is realized by modifying a circuit in a common filter, namely, a Y capacitor series resistor in a filter circuit. Therefore, the cost of the filter can be reduced, the filtering effect of the filter can be improved, and the installation space required by the filter can be reduced.
2. The technical scheme is as follows:
a design circuit of a three-phase four-wire general filter is characterized in that: comprises a circular nickel-zinc ferrite magnetic core; the wire A, the wire B, the wire C and the wire N are wound outside the nickel-zinc ferrite magnetic core for a certain number of turns to form an inductor L, and then the inductor L and a capacitor resistor form a resonance filter circuit and are connected with equipment.
Further, the specific circuit is as follows: a resistor R1 and a capacitor C1 are connected between the A line and the N line in parallel, the resistor R1 and the capacitor C1 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C4, and the other end of the capacitor C4 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C4 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with one end of the resistor R4, and the other end of the resistor R4 is grounded; one terminal of the capacitor C7 is connected to the load.
A resistor R3 and a capacitor C3 are connected between the B line and the N line in parallel, the resistor R3 and the capacitor C3 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C5, and the other end of the capacitor C5 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C5 is connected with one end of the capacitor C8, the other end of the capacitor C8 is connected with one end of the resistor R5, and the other end of the resistor R5 is grounded; one terminal of the capacitor C8 is connected to the load.
A resistor R2 and a capacitor C2 are connected between the C line and the N line in parallel, the resistor R2 and the capacitor C2 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C6, and the other end of the capacitor C6 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C6 is connected with one end of the capacitor C9, the other end of the capacitor C9 is connected with one end of the resistor R6, and the other end of the resistor R6 is grounded; one terminal of the capacitor C9 is connected to the load.
The output end of the N wire loop after bypassing the nickel-zinc ferrite core is connected with one end of a capacitor C10, the other end of a capacitor C10 is connected with one end of a resistor R7, the other end of a resistor R7 is grounded, and one end of a capacitor C10 is connected with a load.
Further, the inductance value of the inductor L is 0.3 mH; the capacitors C1, C2, C3, C4, C5 and C6 are all X2 capacitors with the capacitance value of 0.47 uF; the C7, the C8, the C9 and the C10 are Y capacitors of 10 nF; the resistors R1, R2 and R3 are all metal film resistors with 1M ohm and 1W; the resistors R4, R5, R6 and R7 are all metal film resistors of 3.3 ohm and 1W.
3. Has the advantages that:
the scheme can improve the performance of the filter for inhibiting common-mode conducted interference under the condition of not increasing the cost. In the method, a common-mode conducted disturbance suppression circuit is adopted; the suppression of common mode conducted interference is realized by serially connecting the Y capacitor with the metal film resistor in the filter circuit, and the energy of the common mode conducted interference is consumed by serially connecting the resistor, so that the interference of the common mode conducted interference on an external circuit is reduced. In the selection of the Y capacitor, the Y capacitor with a larger capacitance value, namely the Y capacitor of 10nF, is selected in the method. In the selection of the resistance, the method selects the metal film resistance of 3.3 ohm and 1W. Since the common mode conduction energy in 0.3-30MHz is generally small, i.e., a small resistance value can dissipate the common mode conduction energy without overheating the resistor.
Drawings
FIG. 1 is a detailed circuit diagram of the method.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a design circuit of a three-phase four-wire general filter is characterized in that: a design circuit of a three-phase four-wire general filter is characterized in that: comprises a circular nickel-zinc ferrite magnetic core; the wire A, the wire B, the wire C and the wire N are wound outside the nickel-zinc ferrite magnetic core for a certain number of turns to form an inductor L, and then the inductor L and a capacitor resistor form a resonance filter circuit and are connected with equipment.
Further, the specific circuit is as follows: a resistor R1 and a capacitor C1 are connected between the A line and the N line in parallel, the resistor R1 and the capacitor C1 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C4, and the other end of the capacitor C4 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C4 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with one end of the resistor R4, and the other end of the resistor R4 is grounded; one terminal of the capacitor C7 is connected to the load.
A resistor R3 and a capacitor C3 are connected between the B line and the N line in parallel, the resistor R3 and the capacitor C3 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C5, and the other end of the capacitor C5 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C5 is connected with one end of the capacitor C8, the other end of the capacitor C8 is connected with one end of the resistor R5, and the other end of the resistor R5 is grounded; one terminal of the capacitor C8 is connected to the load.
A resistor R2 and a capacitor C2 are connected between the C line and the N line in parallel, the resistor R2 and the capacitor C2 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C6, and the other end of the capacitor C6 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C6 is connected with one end of the capacitor C9, the other end of the capacitor C9 is connected with one end of the resistor R6, and the other end of the resistor R6 is grounded; one terminal of the capacitor C9 is connected to the load.
The output end of the N wire loop after bypassing the nickel-zinc ferrite core is connected with one end of a capacitor C10, the other end of a capacitor C10 is connected with one end of a resistor R7, the other end of a resistor R7 is grounded, and one end of a capacitor C10 is connected with a load.
Further, the inductance value of the inductor L is 0.3 mH; the capacitors C1, C2, C3, C4, C5 and C6 are all X2 capacitors with the capacitance value of 0.47 uF; the C7, the C8, the C9 and the C10 are Y capacitors of 10 nF; the resistors R1, R2 and R3 are all metal film resistors with 1M ohm and 1W; the resistors R4, R5, R6 and R7 are all metal film resistors of 3.3 ohm and 1W. In the device, the size of the inductor L is controlled by the number of turns of the winding coil.
In the invention, a nickel-zinc ferrite circular magnetic core is adopted, an inductor with a coil with a fixed turn number is wound outside the magnetic core, the inductor and a resistance capacitor form a resonance filter circuit, the inductance value is 0.3mH, 6X 2 capacitors with 0.47uF, 4Y capacitors with 10nF, 4 metal film resistors with 3.3 ohm and 1W and 3 metal film resistors with 1M ohm and 1W. As shown in fig. 1, R1 is connected in parallel with C1, R2 is connected in series with C2, R3 is connected in series with C3, C4, C5 and C6 are respectively bridged between three live wires and three neutral wires, so as to absorb internal interference frequency and filter differential mode interference, C7 is connected in series with R4, C8 is connected in series with R5, C9 is connected in series with R6, and C10 is connected in series with R7, and the three live wires and the three neutral wires are respectively bridged between ground, so as to filter common mode interference. The X capacitor and the magnetic ring have the function of inhibiting differential mode interference, and the Y capacitor, the 3.3 ohm 1W metal film resistor and the magnetic ring have the function of inhibiting common mode conducted interference within 0.3-30 MHz. It can be seen from the above circuit that the performance of the filter for suppressing common mode conducted interference can be improved without increasing the cost.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A design circuit of a three-phase four-wire general filter is characterized in that: comprises a circular nickel-zinc ferrite magnetic core; the wire A, the wire B, the wire C and the wire N are wound outside the nickel-zinc ferrite magnetic core for a preset number of turns to form an inductor L, and then the inductor L and a capacitor resistor form a resonance filter circuit and are connected with equipment.
2. A design circuit of a three-phase four-wire general filter according to claim 1, characterized in that: the specific circuit is as follows: a resistor R1 and a capacitor C1 are connected between the A line and the N line in parallel, the resistor R1 and the capacitor C1 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C4, and the other end of the capacitor C4 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C4 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with one end of the resistor R4, and the other end of the resistor R4 is grounded; one end of the capacitor C7 is connected with the load;
a resistor R3 and a capacitor C3 are connected between the B line and the N line in parallel, the resistor R3 and the capacitor C3 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C5, and the other end of the capacitor C5 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C5 is connected with one end of the capacitor C8, the other end of the capacitor C8 is connected with one end of the resistor R5, and the other end of the resistor R5 is grounded; one end of the capacitor C8 is connected with the load;
a resistor R2 and a capacitor C2 are connected between the C line and the N line in parallel, the resistor R2 and the capacitor C2 surround the nickel-zinc ferrite core and then are connected with one end of a capacitor C6, and the other end of the capacitor C6 is connected with the N line which surrounds the nickel-zinc ferrite core; one end of the capacitor C6 is connected with one end of the capacitor C9, the other end of the capacitor C9 is connected with one end of the resistor R6, and the other end of the resistor R6 is grounded; one end of the capacitor C9 is connected with the load;
the output end of the N wire loop after bypassing the nickel-zinc ferrite core is connected with one end of a capacitor C10, the other end of a capacitor C10 is connected with one end of a resistor R7, the other end of a resistor R7 is grounded, and one end of a capacitor C10 is connected with a load.
3. A design circuit of a three-phase four-wire general filter according to claim 2, characterized in that: the inductance value of the inductor L is 0.3 mH; the capacitors C1, C2, C3, C4, C5 and C6 are all X2 capacitors with the capacitance value of 0.47 uF; the C7, the C8, the C9 and the C10 are Y capacitors of 10 nF; the resistors R1, R2 and R3 are all metal film resistors with 1M ohm and 1W; the resistors R4, R5, R6 and R7 are all metal film resistors of 3.3 ohm and 1W.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920509743.XU CN210490474U (en) | 2019-04-16 | 2019-04-16 | Design circuit of three-phase four-wire general filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920509743.XU CN210490474U (en) | 2019-04-16 | 2019-04-16 | Design circuit of three-phase four-wire general filter |
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| CN210490474U true CN210490474U (en) | 2020-05-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865121A (en) * | 2020-08-10 | 2020-10-30 | 中惠创智无线供电技术有限公司 | Single-phase and three-phase compatible PFC converter and control method thereof |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865121A (en) * | 2020-08-10 | 2020-10-30 | 中惠创智无线供电技术有限公司 | Single-phase and three-phase compatible PFC converter and control method thereof |
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