CN112670064A - Energy-saving filtering type power transformer - Google Patents
Energy-saving filtering type power transformer Download PDFInfo
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- CN112670064A CN112670064A CN202010379941.6A CN202010379941A CN112670064A CN 112670064 A CN112670064 A CN 112670064A CN 202010379941 A CN202010379941 A CN 202010379941A CN 112670064 A CN112670064 A CN 112670064A
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Abstract
The invention discloses an energy-saving filtering type power transformer which comprises a transformer main body and a main circuit, wherein the transformer main body comprises a primary end and a secondary end, the primary end is connected with commercial power, the secondary end is connected with the main circuit, a main induction coil and a main capacitor are arranged on the main circuit, and the main induction coil and the main capacitor form series resonance or parallel resonance on the main circuit. The inductance of the main induction coil can be controlled and adjusted according to the high-order harmonic component on the secondary end. The power transformer also comprises a signal circuit which is connected in parallel with one side of the main circuit close to the secondary end; the signal circuit comprises a signal resistor and a plurality of signal branches, wherein each signal branch is provided with a first inductor, a first capacitor and a signal transmission end which are connected in series, the inductor and the capacitor on each branch form high-order resonance at the position, and the signal transmission end on each branch is used for controlling the inductor of the main inductor coil after acquiring the current of the branch.
Description
Technical Field
The invention relates to the field of circuit filter transformers, in particular to an energy-saving filter type power transformer.
Background
Because the equipment of each user in the power grid is complex, for example, many induction motors, frequency modulators and many equipment which do not operate with power frequency current, they transmit load current of the power grid with many high-order harmonic currents, taking the power frequency power grid as an example, the power frequency power grid not only has 50hz power frequency current, but also has several harmonic currents with frequencies of 3, 5 and 7 … times, and if the current (voltage) reaches the ordinary user end, the equipment of the user is likely to be damaged, so an effective harmonic suppression means is needed.
In the prior art, the harmonic suppression is divided into a passive filter and an active filter, the passive filter has a wider application range by using a double-tuned filter, which, in combination with series resonance and parallel resonance, can effectively filter two specific frequencies (most commonly frequencies corresponding to orders 3, 5), but, when the harmonics in the grid are of the third frequency, this is not sufficient, although 3 and 5 order harmonics are common, if seven order harmonics with larger effective values are present, the devices at the user end are damaged greatly, and no matter whether the 3 and 5 order harmonic currents in the circuit are larger or not, the impedance of the filter is always in the circuit, and occupies power to form reactive loss, so that the overall power factor is reduced. The filter of the existing device can be achieved only by an active filter, however, when the active filter works, because the filtering principle consumes great power, the passive filter is characterized in that a path with low resistance to a certain frequency is constructed in a circuit structure, currents with other frequencies pass through a load, most of the currents with specific frequencies pass through a resonant path, and the currents are equivalent to a short-circuit load under the specific frequency, so that the passive filter can be completed without consuming energy in principle, the working principle of the active filter is that the currents with corresponding orders are superposed in the circuit in short, so that the elimination purpose is achieved, and the superposed high-order currents need to be provided by an independent power supply.
Disclosure of Invention
The invention aims to provide an energy-saving filtering type power transformer to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
an energy-saving filtering type power transformer comprises a transformer main body and a main circuit, wherein the transformer main body comprises a primary end and a secondary end, the primary end is connected with a mains supply, the secondary end is connected with the main circuit, a main induction coil and a main capacitor are arranged on the main circuit, and the main induction coil and the main capacitor form series resonance or parallel resonance on the main circuit.
The invention directly integrates a resonance filter circuit in a transformer, filters out higher harmonics which are possibly transmitted backwards by the transformer and have frequency higher than power frequency, and the circuit has third harmonic components besides fundamental waves, so that the total waveform can be changed after combination, the higher harmonics can damage electronic devices of a user side, and series resonance or parallel resonance is a common filtering means. The invention integrates the filter circuit at the frequency converter, and the position is closest to the user terminal, so complete filtering can be completely realized.
Furthermore, the inductance of the main induction coil can be controlled and adjusted according to the high-order harmonic component on the secondary end.
In the principle of harmonic filtering, according to the values of an inductor and a capacitor in an impedor, corresponding to harmonics of different frequencies, only one or two sets of resonance circuits can be arranged in a common circuit, a series connection or parallel connection mode is used for one set of resonance circuit, and a combination mode of series connection and parallel connection is needed for two sets of resonance circuits, so that a double-tuned filter can only tune harmonics of two frequencies, and cannot tune harmonics of other orders, but the effective value of the harmonics of the order (namely the absolute value of the current of the order) which cannot be predicted in a single circuit is large, if only three times or five times of harmonic filtering are actually arranged, when the effective value of the seventh harmonic on a main circuit is increased, the filtering capacity cannot be provided, and the seventh harmonic reaches a user load to cause damage.
The invention changes the inductance value, the order harmonic which is most needed to be filtered in the matching circuit passes the other order harmonics with lower effective value. The inductance value can be changed in a number of ways.
Furthermore, the power transformer also comprises a signal circuit which is connected in parallel with one side of the main circuit close to the secondary end;
the signal circuit comprises a signal resistor and a plurality of signal branches, wherein each signal branch is provided with a first inductor, a first capacitor and a signal transmission end which are connected in series, the inductor and the capacitor on each branch form high-order resonance at the position, and the signal transmission end on each branch is used for controlling the inductor of the main inductor coil after acquiring the current of the branch.
The existence of the signal circuit can obtain the original voltage waveform from the main circuit, a plurality of branches respectively and smoothly pass through the order harmonic wave, a current value signal is given out on a signal transmission end, a third order branch gives out a third harmonic wave value, and the order wave which is most required to be filtered in the main circuit is obtained through comparison.
Furthermore, the power transformer also comprises a signal transmission line, a current comparator, a magnetic flux iron core and an inductance regulating coil, wherein the magnetic flux iron core is inserted into the center of the main inductance coil, one end of the main inductance coil extends out, the inductance regulating coil is wound on the excircle of the end, extending out of the main inductance coil, of the magnetic flux iron core, the inductance regulating coil is connected to the output end of the current comparator, the input end of the current comparator is respectively connected with a plurality of signal transmission ends in the signal circuit through the signal transmission line, and the current comparator selects the component with the largest current in the plurality of signal transmission ends and then loads the component onto the inductance regulating.
The signal transmission line respectively transmits a plurality of times of harmonic waves of small current detected in the signal circuit to the current comparator, the current comparator compares the current magnitude and loads the harmonic waves on the inductance regulating coil by step signals, the effective value of the fifth harmonic wave in the original circuit is greater than the third harmonic wave in one period, therefore, the current comparator selects the fifth harmonic wave as an output frequency, the output value is a digital step signal corresponding to the fifth harmonic wave, the current of the frequency loads on the inductance regulating coil to establish a magnetic field, the self-established magnetic field of the main inductance coil is influenced by the magnetic flux iron core, the inductance magnitude of the main inductance coil represents the resistance of the main inductance coil to current fluctuation, therefore, the inductance can be increased by expanding the magnetic field established by the main inductance coil by the aid of an external magnetic field, the increased inductance is related to the magnetic field strength of the inductance regulating coil, and the magnetic field magnitude of the inductance regulating coil is determined by I-D, that is, when the effective value of the fifth harmonic on the main circuit is large, the inductance of the main induction coil is changed through the inductance adjusting coil, so that the resonance frequency is equal to the fifth harmonic frequency, and the specific frequency is filtered;
similarly, in another period, when the third harmonic effective value is larger, at this time, the output frequency of the current comparator is the third harmonic frequency, and the inductance adjusting coil driven by the third harmonic changes the self-established magnetic field of the main inductance coil, so that the inductance of the main inductance coil is updated to the inductance required by the resonance corresponding to the third-order current.
The size-adjustable main induction coil can filter currents of different orders according to conditions, and a simple circuit guarantees that filtering effectiveness is maximized.
Preferably, the main induction coil and the main capacitor form series resonance on the main circuit, the main capacitor is connected with the user load in parallel, and the main induction coil is connected with the user load in series.
For series resonance, when the frequency of the current passing through it is lower than the resonance frequency, its own impedance is capacitive, and the actual situation is: the primary current (power frequency current) is the current with the largest proportion in the circuit, so the series resonance is capacitive to the power frequency current, the parallel resonance is inductive to the power frequency current according to the basic knowledge in the field, and the series resonance filtering mode makes the capacitive and the inductive factor at the transformer compensate for each other, so that the power factor approaches one as a whole, and the inductive impedance of the parallel resonance relative to the power frequency current is superposed with the inductive impedance at the transformer main body to reduce the power factor of the whole circuit, and generally needs reactive compensation.
Compared with the prior art, the invention has the beneficial effects that: after the transformer main body is used for transforming voltage, each order harmonic wave on a power grid is detected by the signal circuit and transmitted to the current comparator in a shunting manner, the current comparator outputs the harmonic wave with the maximum effective value to the inductance regulating coil by a certain amplification factor, the magnetic flux iron core restrains the magnetic field and transmits the magnetic field to the self-built magnetic field of the main inductance coil to change the inductance of the main inductance coil, so that the resonance frequency on the main circuit is set as the harmonic wave with the maximum effective value, and the harmonic waves of other orders are ignored. Compared with an active filter circuit, the circuit consumes very little energy at the current comparator, is not wasted, and has the advantages of simple circuit and targeted filtering due to the integrated filter circuit.
Drawings
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is view A of FIG. 1;
FIG. 3 is view B of FIG. 1;
FIG. 4 is a diagram of a common commercial network current waveform with third harmonic;
fig. 5 shows the principle of current signal selection for adjusting the inductance of the main inductor coil in the inductor-adjusting coil according to the present invention.
In the figure: 1-transformer body, 11-primary end, 12-secondary end, 2-main circuit, 31-main inductance coil, 32-main capacitor, 4-signal circuit, 41-signal resistor, 42-first inductor, 43-first capacitor, 44-signal transmission end, 61-signal line, 62-current comparator, 63-magnetic flux iron core and 64-inductance regulating coil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an energy-saving filtering power transformer includes a transformer main body 1 and a main circuit 2, the transformer main body 1 includes a primary end 11 and a secondary end 12, the primary end 11 is connected to a commercial power, the secondary end 12 is connected to the main circuit 2, the main circuit 2 is provided with a main induction coil 31 and a main capacitor 32, and the main induction coil 31 and the main capacitor 32 form a series resonance or a parallel resonance on the main circuit 2.
In the invention, a resonance filter circuit is directly integrated in a transformer to filter out higher harmonics which are possibly transmitted backward by the transformer and have frequency higher than power frequency, as shown in fig. 4, the circuit has third harmonic components besides fundamental waves, after combination, the total waveform can be changed, the higher harmonics can damage electronic devices at a user side, and series resonance or parallel resonance is a common filtering means. The invention integrates the filter circuit at the frequency converter, and the position is closest to the user terminal, so complete filtering can be completely realized.
The magnitude of the inductance of the main inductor coil 31 is controllably adjusted in accordance with the magnitude of the higher harmonic component on the secondary side 12.
In the harmonic filtering principle, according to the values of the inductance and the capacitance in the impedance device, the angular frequency of the harmonic filtered by the resonance circuit formed by the main inductance coil 31 (inductance value L1) and the main capacitance 32 (capacitance value C1) is equal to the angular frequency of the harmonic of different frequencies corresponding to the harmonic of the series resonance shown in fig. 1
1/√（L1*C1）；
When the angular frequency of the third harmonic is equal to the angular frequency of the third harmonic (3X 2 Pi X50 Hz), the third harmonic can be filtered, and when the angular frequency of the fifth harmonic is equal to the angular frequency of the fifth harmonic (5X 2 Pi X50 Hz), the fifth harmonic can be filtered;
generally, only one or two sets of resonant circuits can be arranged in a circuit, a series connection or parallel connection mode is used for one set of resonant circuit, and the two sets of resonant circuits need a combination mode of series connection and parallel connection, so that a double-tuned filter can only tune harmonics of two frequencies, and cannot be used for other orders of harmonics, but the effective value (namely the absolute value of current of the order) of the harmonics of which order cannot be predicted in a single path is large, if only three times and five times of harmonic filtering are actually arranged, when the effective value of the seventh harmonic on a main circuit 2 is increased, filtering capacity cannot be provided, and the seventh harmonic reaches a user load to cause damage.
The invention changes the inductance value, the order harmonic which is most needed to be filtered in the matching circuit passes the other order harmonics with lower effective value. The inductance value can be changed in a number of ways.
As shown in fig. 1 and 2, the power transformer further includes a signal circuit 4, wherein the signal circuit 4 is connected in parallel to one side of the main circuit 2 close to the secondary end 12;
the signal circuit 4 includes a signal resistor 41 and a plurality of signal branches, each signal branch is provided with a first inductor 42, a first capacitor 43 and a signal transmission terminal 44 which are connected in series, the inductor and the capacitor on each branch form a high-order resonance at this position, and the frequency w = (reciprocal after L × C root number) at the corner of the series resonance circuit, that is, the formula that the size of L3 and C3 corresponding to the third harmonic should satisfy is: f3=3 × 50Hz = 1/(2 × pi √ (L3 × C3), and the equation to be satisfied for the size of L5 and C5 corresponding to the fifth harmonic is f5=5 × 50Hz = 1/(2 × pi √ (L5 × C5), and the following higher harmonic signal branches can be analogized, and it is generally only necessary to detect the first five to six higher harmonics to satisfy the use, and the higher harmonic components are very small, and no harm will be generated even if the filtering on the main circuit is not performed, but if a frequency converter or other components are provided before and after the transformer to supply power to the load, the current components corresponding to the higher harmonics should be filtered according to the actual situation to prevent the harm from being generated on the load, and the signal transmission terminal 44 on each branch acquires the branch current size to control the size of the main inductive coil 31.
The existence of the signal circuit 4 can obtain the original voltage waveform from the main circuit, the multiple branches respectively and smoothly pass through the order harmonic wave, and give a current value signal on the signal transmission terminal 44, the third order branch (i.e. the branch where L3 and C3 are located in fig. 2) gives a third order harmonic wave value, and the order wave which needs to be filtered most in the main circuit 2 is obtained by comparison.
As shown in fig. 1 and 3, the power transformer further includes a signal transmission line 61, a current comparator 62, a flux core 63 and a sense-adjusting coil 64, the flux core 63 is inserted into the center of the main sense coil 31 and one end of the flux core 63 extends out, the sense-adjusting coil 64 is wound on the outer circle of the end of the flux core 63 extending out of the main sense coil 31, the sense-adjusting coil 64 is connected to the output end of the current comparator 62, the input end of the current comparator 62 is respectively connected to the plurality of signal transmission terminals 44 in the signal circuit 4 through the signal transmission line 61, and the current comparator 62 selects the component with the largest current in the plurality of signal transmission terminals 44 and then applies the component to the sense-adjusting coil 64.
The signal transmission line 61 transmits the harmonics of several times of small currents detected in the signal circuit 4 to the current comparator 62, the current comparator 62 compares the magnitudes of the currents, and then the harmonics are loaded on the inductance regulating coil 64 by step signals, as shown in fig. 5, in the first period, the effective value of the fifth harmonic in the original circuit is greater than the third harmonic (I5 > I3), so that the current comparator 62 selects the fifth harmonic as an output frequency, the output value is a digital step signal I5-D corresponding to the fifth harmonic, the current loading of the frequency establishes a magnetic field on the inductance regulating coil 64, the self-established magnetic field of the main inductance coil 31 is influenced by the flux core 63, the magnitude of the inductance of the main inductance coil 31 represents the resistance to the current fluctuation, therefore, the magnetic field established by the main inductance coil 31 itself can be enlarged by the help of the applied magnetic field, and the increased inductance is related to the magnetic field strength of the inductance regulating coil 64, the magnitude of the magnetic field of the inductance adjusting coil 64 is determined by I5-D, that is, when the effective value of the fifth harmonic is large on the main circuit 2, the inductance of the main inductance coil 31 is changed by the inductance adjusting coil 64 to make the resonance frequency equal to the fifth harmonic frequency, and the specific frequency is filtered;
similarly, as shown in fig. 5, in the second period, the effective value of the third harmonic is larger, at this time, the output frequency of the current comparator 62 is the third harmonic frequency, the effective value is I3-D corresponding to the third harmonic, and the inductance adjusting coil 64 driven by I3-D changes the self-established magnetic field of the main induction coil 31, so that the inductance of the main induction coil 31 is updated to the inductance required by the resonance corresponding to the third-order current.
The size-adjustable main induction coil 31 can filter currents of different orders according to conditions, and a simple circuit guarantees that filtering effectiveness is maximized.
The main inductance coil 31 and the main capacitor 32 form a series resonance on the main circuit 2, the main capacitor 32 is connected in parallel with the user load, and the main inductance coil 31 is connected in series with the user load.
For series resonance, when the frequency of the current passing through it is lower than the resonance frequency, its own impedance is capacitive, and the actual situation is: the primary current (power frequency current) is the current with the largest proportion in the circuit, so the series resonance is capacitive to the power frequency current, the parallel resonance is inductive to the power frequency current according to the basic knowledge in the field, and the series resonance filtering mode makes the capacitive and the inductive factor at the transformer compensate each other to make up a part of the inductive factor after being combined with the transformer main body 1 into a whole, so that the power factor approaches one as a whole, and the inductive impedance of the parallel resonance relative to the power frequency current is superposed with the inductive impedance at the transformer main body 1 to reduce the power factor of the whole circuit, and reactive compensation is generally needed.
The simple use principle of the invention is as follows: the commercial power is loaded on the primary end, then the harmonic waves of each order are detected by the signal circuit 4 and transmitted to the current comparator 62 in a shunting manner, the current comparator 62 outputs the harmonic wave of the maximum effective value to the adjustable induction coil 64 with a certain amplification factor, the magnetic flux iron core 63 restrains the magnetic field and transmits the magnetic field to the self-built magnetic field of the main induction coil 31 to change the inductance of the main induction coil 31, so that the resonance frequency on the main circuit 2 is set as the harmonic wave of the maximum effective value, and the harmonic waves of the other orders are ignored. The energy consumed by the present circuit at current comparator 62 is small and not wasted, as compared to active filter circuits.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides an energy-conserving filtering type power transformer, power transformer includes transformer main part (1), main circuit (2), and transformer main part (1) includes primary end (11) and secondary end (12), and the commercial power is connected in primary end (11), and main circuit (2), its characterized in that are connected in secondary end (12): the main circuit (2) is provided with a main induction coil (31) and a main capacitor (32), and the main induction coil (31) and the main capacitor (32) form series resonance or parallel resonance on the main circuit (2).
2. The energy-saving filtering type power transformer of claim 1, wherein: the inductance of the main induction coil (31) can be controlled and adjusted according to the high-order harmonic component on the secondary end (12).
3. The energy-saving filtering type power transformer of claim 2, wherein: the power transformer also comprises a signal circuit (4), wherein the signal circuit (4) is connected to one side, close to the secondary end (12), of the main circuit (2) in parallel; the signal circuit (4) comprises a signal resistor (41) and a plurality of signal branches, a first inductor (42), a first capacitor (43) and a signal transmission end (44) which are connected in series are arranged on each signal branch, and the signal transmission end (44) on each signal branch is used for controlling the inductance of the main induction coil (31) after acquiring the current of the branch.
4. The energy-saving filtering type power transformer of claim 3, wherein: the power transformer further comprises a signal transmission line (61), a current comparator (62), a magnetic flux iron core (63) and a sensing adjusting coil (64), wherein the magnetic flux iron core (63) is inserted into the center of the main sensing coil (31) and one end of the magnetic flux iron core extends out, the sensing adjusting coil (64) is wound on an excircle of one end, extending out of the main sensing coil (31), of the magnetic flux iron core (63), the sensing adjusting coil (64) is connected to the output end of the current comparator (62), the input end of the current comparator (62) is respectively connected with a plurality of signal transmission ends (44) in the signal circuit (4) through the signal transmission line (61), and the current comparator (62) selects the largest component of the plurality of signal transmission ends (44) and then loads the largest component of the current onto the sensing adjusting coil (64) through proportional amplification.
5. The energy-saving filtering type power transformer of claim 4, wherein: the main induction coil (31) and the main capacitor (32) form series resonance on the main circuit (2), the main capacitor (32) is connected with a user load in parallel, and the main induction coil (31) is connected with the user load in series.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023019909A1 (en) * | 2021-08-17 | 2023-02-23 | 深圳飞骧科技股份有限公司 | Harmonic suppression circuit, power amplifier module, communication device, and communication system |
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