CN111082653A - Multistage frequency jittering circuit based on triode - Google Patents
Multistage frequency jittering circuit based on triode Download PDFInfo
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- CN111082653A CN111082653A CN201811226723.8A CN201811226723A CN111082653A CN 111082653 A CN111082653 A CN 111082653A CN 201811226723 A CN201811226723 A CN 201811226723A CN 111082653 A CN111082653 A CN 111082653A
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- 239000003990 capacitor Substances 0.000 claims description 6
- 206010044565 Tremor Diseases 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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Abstract
The invention relates to the technical field of electromagnetic anti-interference of circuits, in particular to a multistage frequency jittering circuit based on triodes, which comprises a square wave generating module, a phase-staggered control module and a multistage frequency control module, wherein the square wave generating module is used for generating square waves with fixed duty ratio, the phase-staggered control module converts the square waves into triangular waves and controls the on-off of the triodes of the multistage frequency control module, so that the resistance value in series-parallel connection with a main frequency resistor of an external chip is changed, the output frequency of the external chip is changed, and the multistage frequency output is realized by changing the number of the triodes in the multistage frequency control module and the resistance value in series-parallel connection. The invention can change the main frequency radiated outwards by the external chip in multiple stages, so that the actual output frequency of the external chip is distributed around the main frequency, thereby reducing EMI and improving EMC performance.
Description
Technical Field
The invention relates to the technical field of electromagnetic interference resistance of circuits, in particular to a multistage frequency jittering circuit based on a triode.
Background
At present, in the field of automobile lamps, EMC tests of various major automobile host plants on circuits are strict, and for the EMC test of the automobile lamps, not only the Electromagnetic interference (EMS) of the automobile lamps needs to be considered, but also the automobile lamps can run in accordance with requirements in the Electromagnetic environment, and cannot generate intolerable Electromagnetic interference (EMI) on any equipment in the environment. In a DC-DC power switch module commonly used in a vehicle lamp circuit, external RC charging and discharging is usually adopted to control an operating frequency, and in order to change an output frequency of the DC-DC power switch module, an RC oscillation circuit of the DC-DC power switch module needs to be modulated.
The frequency jittering circuit improves EMI by adopting an internal circuit of a power semiconductor integrated chip, and improves EMC performance by modulating the switching frequency of a DC-DC power switch module.
Disclosure of Invention
The invention provides a multistage frequency jittering circuit based on a triode, which can improve the EMC performance of the circuit.
In order to realize the purpose of the invention, the adopted technical scheme is as follows: the utility model provides a multistage tremble circuit frequently based on triode, the output of multistage tremble circuit frequently based on triode is connected with the frequency pin of external chip, including square wave generation module, wrong looks control module and multistage frequency control module, square wave generation module is used for taking place the square wave of fixed duty ratio, wrong looks control module changes the square wave into the triangle wave, and the break-make of the triode of control module of controlling multistage frequency, and then change the resistance value with external chip owner frequency resistance series-parallel, thereby change the output frequency of external chip, through the resistance value that changes triode number and series-parallel connection in the multistage frequency control module, realize multistage frequency output.
As an optimized scheme of the invention, the staggered-phase control module comprises a capacitor C3 and a diode D1, the capacitor C3 converts the square wave output by the square wave generation module into a triangular wave, and the diode D1 is used for controlling the on-off of the triode in the multistage frequency control module.
As an optimized solution of the present invention, the multi-stage frequency control module includes a third triode Q3, a fifth resistor R5, a sixth resistor R6, an nth resistor Rn, an nth triode Qn, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9, one end of the fifth resistor R5 is connected to the positive electrode of the diode D1, the other end of the fifth resistor R5 is connected to the base of the third triode Q3, the emitter of the third triode Q3 is connected to the emitter of the nth triode Qn, the collector of the third triode Q3 is connected to one end of the sixth resistor R6, the negative electrode of the diode D1 is connected to one end of the nth resistor Rn, the other end of the nth resistor Rn is connected to the base of the nth triode Qn, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, the other end of the eighth resistor Qn 8 is connected to the emitter of the triode Qn 8, one end of the ninth resistor R9 is connected to one end of the eighth resistor R8, and the other end of the ninth resistor R9 is connected to a frequency pin of an external chip.
As an optimized scheme of the invention, the square wave generating module comprises a first transistor Q1 and a second transistor Q2, and the first transistor Q1 and the second transistor Q2 are alternately switched on and off to generate a square wave with a fixed duty ratio.
As an optimized scheme of the invention, the triodes of the square wave generation module and the multistage frequency control module are both packaged by adopting a PCB (printed Circuit Board) with two triodes integrated together
The invention has the positive effects that: the invention can change the dominant frequency radiated outside by the external chip in multiple stages, so that the actual output frequency of the external chip is distributed around the dominant frequency, thereby reducing EMI and improving EMC performance;
2) the circuit structure of the invention is simple, and the design and experiment cost is saved due to the circuit constitution based on the triode.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a block diagram of the overall architecture of the present invention;
FIG. 2 is a circuit diagram of a phase error control module;
FIG. 3 is a circuit diagram of a multi-stage frequency control module;
fig. 4 is a circuit diagram of a square wave generating module.
Wherein: 1. the device comprises a square wave generating module, 2, a phase-staggered control module, 3, a multi-stage frequency control module, 4 and an external chip.
Detailed Description
As shown in fig. 1-4, the invention discloses a multistage frequency jittering circuit based on a triode, wherein the output end of the multistage frequency jittering circuit based on the triode is connected with a frequency pin of an external chip 4, and the multistage frequency jittering circuit comprises a square wave generating module 1, a phase-staggered control module 2 and a multistage frequency control module 3, wherein the square wave generating module 1 is used for generating square waves with a fixed duty ratio, the phase-staggered control module 2 converts the square waves into triangular waves and controls the on-off of the triode of the multistage frequency control module 3, so that the resistance value in series-parallel connection with a main frequency resistor of the external chip 4 is changed, the output frequency is distributed around the main frequency, and higher noise in one frequency band is avoided. The multistage frequency output is realized by changing the number of triodes in the multistage frequency control module 3 and the series-parallel resistance value.
As shown in fig. 2, the phase-staggered control module 2 includes a capacitor C3 and a diode D1, the capacitor C3 converts the square wave output by the square wave generation module 1 into a triangular wave, and the diode D1 is used for controlling the on/off of the transistor of the multilevel frequency control module 3. Different voltage sections are conducted through the cooperation of the diode D1 and the triode of the multistage frequency control module 3, so that the triode of the multistage frequency control module 3 is conducted in a staggered phase mode.
As shown in fig. 3, the multi-stage frequency control module 3 includes a third transistor Q3, a fifth resistor R5, a sixth resistor R6, an nth resistor Rn, an nth transistor Qn, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9, one end of the fifth resistor R5 is connected to the positive electrode of the diode D1, the other end of the fifth resistor R5 is connected to the base of the third transistor Q3, the emitter of the third transistor Q3 is connected to the emitter of the nth transistor Qn, the collector of the third transistor Q3 is connected to one end of the sixth resistor R6, the cathode of the diode D1 is connected to one end of the nth resistor Rn, the other end of the nth resistor Rn is connected to the base of the nth transistor Qn, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, the other end of the eighth resistor Qn 8 is connected to the emitter of the eighth resistor Qn 8, one end of the ninth resistor R9 is connected to one end of the eighth resistor R8, and the other end of the ninth resistor R9 is connected to the frequency pin of the external chip 4. The multistage frequency control module 3 can select the number of the triodes according to actual conditions.
As shown in fig. 4, the square wave generating module 1 includes a first transistor Q1 and a second transistor Q2, and the first transistor Q1 and the second transistor Q2 are alternately turned on and off to generate a square wave with a fixed duty ratio. The fixed duty ratio is 66.6%, the first triode Q1 and the second triode Q2 are connected in a parallel connection mode, and the emitter of the first triode Q1 and the emitter of the second triode Q2 are both grounded.
In addition, the triodes of the square wave generating module 1 and the multistage frequency control module 3 are packaged by integrating two triodes together, so that the layout area of a PCB (printed circuit board) can be reduced.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A multistage tremble circuit frequently based on triode, the output of multistage tremble circuit frequently based on triode is connected with the frequency pin of external chip (4), its characterized in that: the square wave generator comprises a square wave generating module (1), a phase-staggered control module (2) and a multi-level frequency control module (3), wherein the square wave generating module (1) is used for generating square waves with fixed duty ratios, the phase-staggered control module (2) converts the square waves into triangular waves and controls the on-off of triodes of the multi-level frequency control module (3), and then the resistance value in series-parallel connection with a main frequency resistor of an external chip (4) is changed, so that the output frequency of the external chip (4) is changed, and the output of multi-level frequency is realized by changing the number of the triodes in the multi-level frequency control module (3) and the resistance value in series-parallel connection.
2. The triode-based multi-stage dither circuit of claim 1, wherein: the phase-staggered control module (2) comprises a capacitor C3 and a diode D1, the capacitor C3 converts the square wave output by the square wave generation module (1) into a triangular wave, and the diode D1 is used for controlling the on-off of a triode in the multistage frequency control module (3).
3. The triode-based multi-stage dither circuit of claim 2, wherein: the multistage frequency control module (3) comprises a third triode Q3, a fifth resistor R5, a sixth resistor R6, an nth resistor Rn, an nth triode Qn, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, one end of the fifth resistor R5 is connected with the anode of a diode D1, the other end of the fifth resistor R5 is connected with the base of a third triode Q3, the emitter of the third triode Q3 is connected with the emitter of the nth triode Qn, the collector of the third triode Q3 is connected with one end of a sixth resistor R6, the cathode of the diode D1 is connected with one end of the nth resistor Rn, the other end of the nth resistor Rn is connected with the base of the nth triode Qn, the other end of the sixth resistor R6 is connected with one end of a seventh resistor R7, the other end of the seventh resistor R7 is connected with one end of an eighth resistor Rn 8, and the other end of the emitter of the eighth resistor R8 is connected with the triode Qn, one end of the ninth resistor R9 is connected to one end of the eighth resistor R8, and the other end of the ninth resistor R9 is connected to the frequency pin of the external chip (4).
4. A triode based multi-stage dither circuit according to any one of claims 1-3, wherein: the square wave generating module (1) comprises a first triode Q1 and a second triode Q2, wherein the first triode Q1 and the second triode Q2 are alternately switched on and off to generate square waves with fixed duty ratios.
5. The triode-based multi-stage dither circuit of claim 4, wherein: the triodes of the square wave generating module (1) and the multistage frequency control module (3) are packaged by adopting a PCB (printed circuit board) with two triodes integrated together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811226723.8A CN111082653A (en) | 2018-10-22 | 2018-10-22 | Multistage frequency jittering circuit based on triode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811226723.8A CN111082653A (en) | 2018-10-22 | 2018-10-22 | Multistage frequency jittering circuit based on triode |
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| CN111082653A true CN111082653A (en) | 2020-04-28 |
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| CN201811226723.8A Pending CN111082653A (en) | 2018-10-22 | 2018-10-22 | Multistage frequency jittering circuit based on triode |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2352402Y (en) * | 1998-06-08 | 1999-12-08 | 杨昕 | Multiple stage displaying device for indication reducing speed (braking action) |
| CN201418197Y (en) * | 2009-05-18 | 2010-03-03 | 忻兵 | Multi-frequency conversion light-intensity adjusting-type high voltage sodium lamp electronic ballast |
| CN206077755U (en) * | 2016-08-31 | 2017-04-05 | 苏州弘瀚光电有限公司 | Day portable lighter position lamp integral type control circuit |
| CN206250970U (en) * | 2016-08-29 | 2017-06-13 | 苏州弘瀚光电有限公司 | A kind of switching power circuit based on circuit frequency jitter technique |
| CN207911086U (en) * | 2018-03-09 | 2018-09-25 | 上海晨阑光电器件有限公司 | Frequency circuit is trembled based on what triode was built |
| CN209150999U (en) * | 2018-10-22 | 2019-07-23 | 常州星宇车灯股份有限公司 | A kind of multistage based on triode trembles frequency circuit |
-
2018
- 2018-10-22 CN CN201811226723.8A patent/CN111082653A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2352402Y (en) * | 1998-06-08 | 1999-12-08 | 杨昕 | Multiple stage displaying device for indication reducing speed (braking action) |
| CN201418197Y (en) * | 2009-05-18 | 2010-03-03 | 忻兵 | Multi-frequency conversion light-intensity adjusting-type high voltage sodium lamp electronic ballast |
| CN206250970U (en) * | 2016-08-29 | 2017-06-13 | 苏州弘瀚光电有限公司 | A kind of switching power circuit based on circuit frequency jitter technique |
| CN206077755U (en) * | 2016-08-31 | 2017-04-05 | 苏州弘瀚光电有限公司 | Day portable lighter position lamp integral type control circuit |
| CN207911086U (en) * | 2018-03-09 | 2018-09-25 | 上海晨阑光电器件有限公司 | Frequency circuit is trembled based on what triode was built |
| CN209150999U (en) * | 2018-10-22 | 2019-07-23 | 常州星宇车灯股份有限公司 | A kind of multistage based on triode trembles frequency circuit |
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