CN101917173B - Medium-wave harmonic filter - Google Patents
Medium-wave harmonic filter Download PDFInfo
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- CN101917173B CN101917173B CN2010102392004A CN201010239200A CN101917173B CN 101917173 B CN101917173 B CN 101917173B CN 2010102392004 A CN2010102392004 A CN 2010102392004A CN 201010239200 A CN201010239200 A CN 201010239200A CN 101917173 B CN101917173 B CN 101917173B
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Abstract
The invention relates to a medium-wave harmonic filter used for a medium-wave navigation transmitter. The medium-wave harmonic filter consists of five sections of filtering units, wherein each section of filtering unit forms a filtering channel; each section of filtering unit is a seven-order low-pass filter which is formed by connecting four capacitors, three inductors and four relays; the capacitors and the inductors form a filter circuit part of the seven-order low-pass filter; and a relay coil end in each section of filtering unit is connected with a three-eight decoder in an external control unit. Because the relays are controlled by a level signal output by the three-eight decoder of the external control unit in each section of filtering unit, the switching between the filtering units of the control filter is controlled; the harmonic suppression performance of the medium-wave transmitter is improved, so that the second harmonic suppression performance and the third harmonic suppression performance are improved; the switching of intelligent control mode control frequency bands is realized in the medium-wave transmitter; and thus the medium-wave harmonic filter can be applied to 100W, 200W and 500W series medium-wave transmitters and has the advantages of stable work, reliable performance and popularization value.
Description
Technical field
The present invention relates to the communication technical field that navigates, particularly a kind of medium wave harmonic filter that is used for the medium wave navigation launching machinery.
Background technology
The medium wave harmonic filter is the important circuit unit of medium wave navigation launching machinery, in all kinds of medium wave transmitters that are widely used at present adopting the pulsewidth amplification principle to carry out power amplification.But also exist the defective of harmonic wave rejection difference by most medium wave harmonic filter of prior art manufacturing; When causing transmitter to be opened; The harmonic wave that moment produces and influence (interference) other wireless device on every side; The medium wave transmitter harmonic wave of present domestic use is suppressed at-50dB, and International Civil Aviation requirements of convention medium wave transmitter harmonic wave suppresses to be-60dB, and existing medium wave transmitter also to have the frequency range of being assigned a new job be the defective that frequency range is switched difficulty.
Summary of the invention
The object of the invention is exactly for overcoming the deficiency of prior art, and harmonic wave rejection and frequency range switching mode to the medium wave harmonic filter provide a kind of new technical scheme, suppresses index thereby improve harmonic wave, improves the frequency range switching mode.
The present invention realizes through such technical scheme: the medium wave harmonic filter; It is characterized in that; Its circuit is made up of five sections filter units, and every section filter unit constitutes a filtering channel, and wherein every section filter unit is by four capacitor C 1, C2, C3, C4; Three inductance L 1, L2, L3 and four relay K 1, K2, K3, K4 connect into one 7 rank low pass filter, and wherein capacitor C 1, C2, C3, C4 and inductance L 1, L2, L3 form the filter circuit part of 7 rank low pass filters; The input that is connected to 7 rank low pass filters normal battle of relay K 1, K2, normally closed ground connection; The moving contact of relay K 1, K2 is connected to inductance L 1 two ends; Relay K 3, the normal battle of K4 are connected to the output of 7 rank low pass filters, normally closed ground connection; The moving contact of relay K 3, K4 is connected to inductance L 3 two ends; Relay coil end in each section filter unit is connected with three or eight decoders of external control unit.
The input state sign indicating number A0, A1, the A2 that wherein control three or eight decoders are provided with according to actual frequency of utilization; Four relays of each section filter unit of the level signal control medium wave harmonic filter of three or eight decoders output, thereby the conversion between each section of control filters filter unit.
Technical scheme of the present invention adopts and cuts than blood husband low pass filter design principle; Be filtered into basic mentality of designing with seven rank; Because the level signal control relay of exporting by three or eight decoders of external control unit in each section filter unit, and then the conversion between each section of control control filters filter unit; Improved the harmonic wave rejection of medium wave transmitter, second harmonic, triple-frequency harmonics rejection are improved; In medium wave transmitter, realize the switching of intelligent control method control frequency range, can be applicable on 100W, 200W, the 500W seriation medium wave transmitter its working stability, dependable performance, tool promotional value.
Description of drawings
Fig. 1, medium wave harmonic filter theory diagram;
Fig. 2, filter control circuit theory diagram;
Fig. 3, filter unit circuit theory diagrams.
Embodiment
Understand the present invention for clearer, describe the present invention in detail in conjunction with accompanying drawing and embodiment:
To shown in Figure 3, the medium wave harmonic filter is a basic circuit with 7 rank low pass filters, is divided into 5 sections by frequency requirement and carries out filtering like Fig. 1; Wherein the 1st section is 150kHz～189kHz, and the 2nd section is 190kHz～278kHz, and the 3rd section is 279kHz～378kHz, and the 4th section is 379kHz～515kHz, and the 5th section is 516kHz～700kHz.
Realize that thus filtering obtains outputing to antenna tuner after the sinusoidal signal to the filtering of the harmonic wave of the carrier signal of power amplifier unit output.Every section filter unit of medium wave harmonic filter is by four capacitor C 1, C2, C3, C4; Three inductance L 1, L2, L3 and four relay K 1, K2, K3, K4 form; Electric capacity and inductance are formed 7 rank low pass filter filter circuit parts, and wherein capacitor C 1, C2, C3, C4 and inductance L 1, L2, L3 form the filter circuit part of 7 rank low pass filters; Be connected to the normal battle of relay K 1, K2 on the input circuit of 7 rank low pass filters, normally closed ground connection, the moving contact of relay K 1, K2 is connected to inductance L 1 two ends; Relay K 3, the normal battle of K4 are connected on the output circuit of 7 rank low pass filters normally closed ground connection; The moving contact of relay K 3, K4 is connected to inductance L 3 two ends; Relay coil end in each section filter unit is connected with three or eight decoders of external control unit;
When the medium wave harmonic filter is in running order; Carrier frequency according to input is different; In 5 sections filter units of medium wave harmonic filter, have only wherein one section filter unit by gating, all the other are inductance, the whole ground connection of electric capacity contact on the filter unit circuit of gating not; Flatness in the passband reduced the loss of power signal on filter when this measure had guaranteed the work of medium wave harmonic filter.
When a certain section filter unit in the medium wave harmonic filter was in running order, filter unit two ends relay was under the control signal effect, and relay normally open point is connected.
Send into the input of filter unit from the carrier frequency signaling of signal bus; Two relays make middle inductor, electric capacity contact and ground unsettled under the control signal effect in the middle of the filter unit; Carrier frequency signaling is delivered to the carrier frequency signaling bus from the output of filter unit again after electric capacity and inductance are formed 7 rank low pass filter filtering.
When this section filter unit was not worked, filter unit two ends relay was under the off-position, and relay normally open point breaks off.Two ends inductance, electric capacity, middle inductor, electric capacity contact ground connection.
The switching of the relay in the medium wave harmonic filter is controlled by 3～8 decoders, and the carrier frequency signaling of input is succeeded electrical equipment and often made war, normally closed ground connection.When this section filter is not selected, coil, capacity earth, inductance, electric capacity and ground break off and inserting in the signal path when selected
Shown in Figure 2 is the filter control circuit theory diagram, and according to carrier frequency transmit status sign indicating number A0, A1, A2 are set, 3～8 decoders are exported the waveband selection control level by control unit, and one of them is low for this control level, and all the other are high.Control level makes the filter unit gating corresponding with carrier frequency, all the other each section filter unit inductance, capacity earth.
The present invention uses seven rank wave filter technologies, and filter adopts to be cut than blood husband filter as design fundamentals, according to the demand frequency, can reach designing requirement through the different inductance of power selection, electric capacity.Crucial in the Q of inductance value and electric capacity ability to bear to power.
5 kind of seven rank filter of design satisfies the demand of 150kHz～700kHz in middle wave filter.
It is to design around three or eight decoders that the present invention adopts intelligence control circuit, and wherein conditional code A0, A1, A2 be according to the frequency of utilization setting, the conversion between each section of level signal control filters of decoder output.Scheme of the present invention can effectively solve the phase mutual interference of each section filter unit inductance coil, and the inductance coil shorted to earth of not in running order section filter unit is the effective measures that guarantee passband fluctuation.
Technical indicator:
1) reference carrier frequency: 150kHz～700kHz;
2) through-put power: be not less than 500W;
3) inband flatness: be not more than 0.4dB;
Harmonic wave suppresses: the second harmonic inhibition is-25dB; Triple-frequency harmonics suppresses.
According to above-mentioned explanation, can realize scheme of the present invention in conjunction with art technology.
Claims (1)
1. medium wave harmonic filter; It is characterized in that; Its circuit is made up of five sections filter units, and every section filter unit constitutes a filtering channel, and wherein every section filter unit is by four capacitor C 1, C2, C3, C4; Three inductance L 1, L2, L3 and four relay K 1, K2, K3, K4 connect into one 7 rank low pass filter, and wherein capacitor C 1, C2, C3, C4 and inductance L 1, L2, L3 form the filter circuit part of 7 rank low pass filters; The input that is connected to 7 rank low pass filters normal battle of relay K 1, K2, normally closed ground connection; The moving contact of relay K 1, K2 is connected to inductance L 1 two ends; Relay K 3, the normal battle of K4 are connected to the output of 7 rank low pass filters, normally closed ground connection; The moving contact of relay K 3, K4 is connected to inductance L 3 two ends; Relay coil end in each section filter unit is connected with three or eight decoders of external control unit; When the medium wave harmonic filter is in running order; Carrier frequency according to input is different; In 5 sections filter units of medium wave harmonic filter, have only wherein one section filter unit by gating, all the other are inductance, the whole ground connection of electric capacity contact on the filter unit circuit of gating not.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102392004A CN101917173B (en) | 2010-07-29 | 2010-07-29 | Medium-wave harmonic filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102392004A CN101917173B (en) | 2010-07-29 | 2010-07-29 | Medium-wave harmonic filter |
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| CN101917173A CN101917173A (en) | 2010-12-15 |
| CN101917173B true CN101917173B (en) | 2012-11-28 |
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| CN2010102392004A Active CN101917173B (en) | 2010-07-29 | 2010-07-29 | Medium-wave harmonic filter |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602377B (en) * | 2013-10-30 | 2017-03-08 | 美的集团股份有限公司 | Electromagnetic oven and the filter circuit for electromagnetic oven and its control method |
| CN106257841B (en) * | 2015-06-17 | 2019-06-18 | 北京北广科技股份有限公司 | A kind of medium wave transmitter fast frequency switching broadcasting method |
| CN109639253B (en) * | 2018-12-13 | 2023-03-07 | 广州海格通信集团股份有限公司 | Inductor-reusable miniaturized harmonic filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201259538Y (en) * | 2008-09-26 | 2009-06-17 | 天津七六四通信导航技术有限公司 | Power amplifier for meter wave instrument landing equipment |
| CN101488732A (en) * | 2009-02-17 | 2009-07-22 | 何连成 | Lumped parameter rectangular band pass filter |
| CN201403077Y (en) * | 2009-02-17 | 2010-02-10 | 何连成 | Lumped parameter band-pass filter |
-
2010
- 2010-07-29 CN CN2010102392004A patent/CN101917173B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201259538Y (en) * | 2008-09-26 | 2009-06-17 | 天津七六四通信导航技术有限公司 | Power amplifier for meter wave instrument landing equipment |
| CN101488732A (en) * | 2009-02-17 | 2009-07-22 | 何连成 | Lumped parameter rectangular band pass filter |
| CN201403077Y (en) * | 2009-02-17 | 2010-02-10 | 何连成 | Lumped parameter band-pass filter |
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| CN101917173A (en) | 2010-12-15 |
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