CN108173428A - A kind of DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit - Google Patents
A kind of DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit Download PDFInfo
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- CN108173428A CN108173428A CN201810014918.XA CN201810014918A CN108173428A CN 108173428 A CN108173428 A CN 108173428A CN 201810014918 A CN201810014918 A CN 201810014918A CN 108173428 A CN108173428 A CN 108173428A
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- power source
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- exceeded
- frequency circuit
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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
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of DC DC power supplies inhibit radiation dispersion it is exceeded tremble frequency circuit, it includes DC DC power supplies chip, termination power, bleeder circuit and RT_TERM circuits, one end connection DC DC power supplies chip of termination power obtains concussion square wave voltage signal, the other end of termination power is coupled to bleeder circuit and obtains the first fluctuation voltage signal, first fluctuation voltage signal obtains the second fluctuation voltage signal by RT_TERM circuits, and the second fluctuation voltage signal is transferred to the frequency that DC DC power supplies chip generates shake.So as to which the present invention can be such that its switching frequency is shaken in certain range by the switching frequency of adjust automatically DC DC power supplies, radiant energy distribution is realized in certain frequency range to reduce the radiation energy of single-point.
Description
Technical field
The present invention relates to automotive electronics and onboard system technical field of circuit design, more particularly to a kind of DC-DC power source suppression
Radiation dispersion processed it is exceeded tremble frequency circuit.
Background technology
Automotive electronics component accounts for 30% or so of vehicle complete vehicle system component at present, and as vehicle intellectualized development becomes
Gesture, the design of future automobile electronic unit are up to 50% scale of components of vehicle.And with more and more electronic systems and
Intelligent electronic component is introduced among automotive electronics, will be to the EMC of vehicle（Electronic Magnetic
Compatibility, electromagnetic compatibility）Design brings arduous challenge.And current major automaker is different degrees of
The harsh grade of the Design of Compatibility of product is improved, also causes very big difficulty to product E MC designs.EMC experiments simultaneously
Test period and cost will greatly test the component suppliers of all kinds of automotive electronics.Traditional product E MC designs are using screen
Cover cover and RC filtering design method, but its not only performance is difficult to reach existing design requirement, but also can bring complete machine
The deficiencies of weight improves and increases the wiring space of PCB part.
Thus the prior art could be improved and improve.
Invention content
Part in view of above-mentioned deficiencies of the prior art inhibits to radiate the purpose of the present invention is to provide a kind of DC-DC power source
It is spuious it is exceeded tremble frequency circuit, with performance stabilization, circuit reduction, advantages with obvious effects and of low cost etc..
In order to achieve the above object, this invention takes following technical schemes：
A kind of DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit, including DC-DC power source chip, termination power, partial pressure electricity
Road and RT_TERM circuits, one end connection DC-DC power source chip of termination power obtain concussion square wave voltage signal, termination power
The other end be coupled to bleeder circuit obtain first fluctuation voltage signal, first fluctuation voltage signal is obtained by RT_TERM circuits
To the second fluctuation voltage signal, the second fluctuation voltage signal is transferred to the frequency that DC-DC power source chip generates shake.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, and the termination power includes the first coupling
Capacitance, the SW ports of one end connection DC-DC power source chip of the first coupled capacitor, the other end connection partial pressure of the first coupled capacitor
Circuit.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, and the bleeder circuit includes the first partial pressure
Resistance, one end of the first divider resistance connect the other end of the first coupled capacitor, the other end connection RT_ of the first divider resistance
TERM circuits.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, and the RT_TERM circuits are included outside second
Put resistance and the external resistance of third, the RT/SYNC ports of one end connection DC-DC power source chip of the external resistance of third, outside third
Put resistance the other end connect the second external resistance one end and the first divider resistance the other end, the second external resistance it is another
End ground connection.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, and the frequency circuit of trembling further includes BOOT electricity
Road, the BOOT circuits include the 4th resistance and the second capacitance, the BOOT ends of one end connection DC-DC power source chip of the 4th resistance
Mouthful, the other end of the 4th resistance connects one end of the second capacitance, the other end connection power output end of the second capacitance.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, and the frequency circuit of trembling further includes energy storage electricity
Road, the accumulator include the first inductance, and one end of the first inductance connects the other end of the second capacitance, the first inductance it is another
End connection power output end.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, and the frequency circuit of trembling further includes protection electricity
Road, the protection circuit include the first fly-wheel diode, the plus earth of the first fly-wheel diode, and the first fly-wheel diode is born
Pole connects one end of the first inductance, is also connected with the other end of the second capacitance and one end of the first coupled capacitor.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, and the frequency circuit of trembling further includes voltage school
Quasi- circuit, the voltage calibration circuit include the 5th resistance and the 6th resistance, and one end of the 5th resistance connects the another of the first inductance
One end is also connected with power output end, and the other end of the 5th resistance connects one end of the 6th resistance, is also connected with DC-DC power source chip
FB ports, the 6th resistance the other end ground connection.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, and the frequency circuit of trembling further includes soft start
Circuit, the soft starting circuit include third capacitance, the SS ports of one end connection DC-DC power source chip of third capacitance, third
The other end of capacitance connects the second external resistance, and the other end of third capacitance is also grounded.
The DC-DC power source inhibits that radiation dispersion is exceeded to be trembled in frequency circuit, the model of the DC-DC power source chip
LMR14030SDDA。
Compared to the prior art, DC-DC power source provided by the invention inhibit radiation dispersion it is exceeded tremble frequency circuit, including
DC-DC power source chip, termination power, bleeder circuit and RT_TERM circuits, one end connection DC-DC power source chip of termination power
Obtaining concussion square wave voltage signal, the other end of termination power is coupled to bleeder circuit and obtains the first fluctuation voltage signal, and first
Fluctuation voltage signal obtains the second fluctuation voltage signal by RT_TERM circuits, and the second fluctuation voltage signal is transferred to DC-DC electricity
Source chip generates the frequency of shake.So as to which the present invention can make its switch frequency by the switching frequency of adjust automatically DC-DC power source
Rate is shaken in certain range, realizes radiant energy distribution in certain frequency range to reduce the radiation energy of single-point.
Description of the drawings
Fig. 1 is that DC-DC power source provided by the invention inhibits the exceeded circuit diagram one for trembling frequency circuit of radiation dispersion.
Fig. 2 is that DC-DC power source provided by the invention inhibits the exceeded signal processing flow figure for trembling frequency circuit of radiation dispersion.
Fig. 3 is that DC-DC power source provided by the invention inhibits the exceeded circuit diagram two for trembling frequency circuit of radiation dispersion.
Specific embodiment
The present invention provide a kind of DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit, to make the purpose of the present invention, skill
Art scheme and effect are clearer, clear and definite, and the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should manage
Solution, specific embodiment described herein only to explain the present invention, are not intended to limit the present invention.
Referring to Fig. 1, DC-DC power source provided by the invention inhibit radiation dispersion it is exceeded tremble frequency circuit, including DC-DC
Power supply chip U1, termination power 10, bleeder circuit 20 and RT_TERM circuits 30, one end connection DC-DC power source of termination power 10
Chip U1 obtains concussion square wave voltage signal, and the other end of termination power 10 is coupled to bleeder circuit 20 and obtains the first fluctuation voltage
Signal, the first fluctuation voltage signal obtain the second fluctuation voltage signal by RT_TERM circuits 30, and the second fluctuation voltage signal passes
It is handed to the frequency that DC-DC power source chip U1 generates shake.
Wherein, DC-DC power source chip U1 connections termination power 10 and RT_TERM circuits 30, termination power 10 also simultaneously with
Bleeder circuit 20 and RT_TERM circuits 30 are sequentially connected.Specifically, the termination power 10 includes the first coupled capacitor C1, the
The SW ports of one end connection DC-DC power source chip U1 of one coupled capacitor C1, the other end connection partial pressure of the first coupled capacitor C1
Circuit 20.
One end that the bleeder circuit 20 includes the first divider resistance R1, the first divider resistance R1 connects the first coupled capacitor
The other end of C1, the other end connection RT_TERM circuits 30 of the first divider resistance R1.
The RT_TERM circuits 30 include the second external resistance R2 and external resistance R3 of third, the external resistance R3's of third
The RT/SYNC ports of one end connection DC-DC power source chip U1, the other end of the external resistance R3 of third connect the second external resistance R2
One end and the first divider resistance R1 the other end, the second external resistance R2 the other end ground connection.
Please continue to refer to Fig. 1, the SW pins that the first coupled capacitor C1 is connected to DC-DC power source chip U1 by one end obtain
Square-wave voltage is shaken, the voltage in Fig. 1 at A is V at this time.It is obtained on first coupled capacitor C1 to the first external divider resistance R1
Fluctuation voltage signal is taken, and faint first voltage fluctuation signal V_ref1, i.e., Fig. 1 at this time are divided out by the first divider resistance R1
Voltage at middle B is V_ref1, and V_ref1 is via the second external resistance R2 and the RT_TERM circuits of the external resistance R3 compositions of third
Obtain the second fluctuation voltage V_ref2, i.e., the voltage in Fig. 1 at this time at C is V_ref2；Second fluctuation voltage is transmitted to DC-DC electricity
RT_PLL circuits inside source chip U1 generate the frequency of shake, and pass through the switching frequency of adjust automatically DC-DC power source, can make
The switching frequency of SW is shaken in certain range, realizes radiant energy distribution in certain frequency range to reduce single-point
Radiation energy.
To realize above-mentioned EMC effects, please refer to Fig. 2, the DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency electricity
The specific implementation principle on road is as follows：
The second external resistance R2 and the external resistance R3 of third are initialized, series resistance RT_TERM=R2+R3 is formed, obtains such as Fig. 1
Partial pressure V_ref at middle D, RT_TERM circuits are used for the frequency F of initial start；
First coupled capacitor C1 is used to obtain the square-wave voltage V of the SW pins of DC-DC power source chip U1 and coupled to the first partial pressure
Resistance R1 ends, obtain voltage V_ref1；
Wherein voltage V_ref2=V_ref1*R2/ (R1+R2) of the first divider resistance R1 ends；
V_ref2 voltages pass through the pull-up resistor of chip interior and E in partial pressure the acquisition V_refs, i.e. Fig. 1 of the external resistance R3 of third
Voltage after place is stable；
Chip is by the voltage of internal sample V_ref, compares production frequency F.Because V_refs is to change in a certain range
, so frequency F is also changing in a certain range（F1≤F≤F2, F1 and F2 are the frequency obtained by V-refs conversions
Maximum value and frequency minima）；
More specifically, Fig. 2 illustrates that DC-DC power source inhibits the exceeded signal processing flow for trembling frequency circuit of radiation dispersion in invention
Figure, signal processing flow is specially according to above description：
Square-wave voltage on DC-DC power source chip U1 initialization coupling SW pins.Due to the rising edge and failing edge of square-wave voltage
Edge slope it is very precipitous, according to Fourier's product transformation above-mentioned performance carry a large amount of higher hamonic wave.So externally
Radiation is very serious.
Square-wave voltage on SW pins obtains voltage V_ref1 by the first coupled capacitor C1 couplings；
V_ref1 obtains voltage V_ref2 by bleeder circuit；
V_ref2 is added on V_ref and obtains V_refs；
Due to the fluctuation of V_refs, the working frequency of DC-DC chips is made to change in a certain range；
Change the variation of the square-wave voltage frequency on the SW pins of DC-DC power source chip U1 simultaneously；
The frequency of the SW pins of DC-DC power source chip U1 will be distributed over to be changed according in the frequency range changed in F1 ~ F2.Distribution
Switching frequency makes radiant energy distribution in certain bandwidth, so as to reduce the radiation energy of the single-point of DC-DC power source chip U1
It measures and is effectively improved and radiate exceeded situation.And the Normal practice filtered compared to traditional shielding case and RC, the present invention carry
The frequency circuit of trembling that the DC-DC power source of confession inhibits radiation dispersion exceeded has the following advantages：
1. performance is stable, improvement is apparent；
2. bulky shielding case can be removed, the wiring space of PCB and the weight of complete machine are solved；
3. circuit is simply of low cost, without additionally increasing production technology.
Meanwhile more preferable more perfect EMC effects in order to obtain, as shown in figure 3, the present invention also provides a kind of preferred embodiments
DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit.Wherein, it is 10nF that the first coupled capacitor C1, which selects capacitance, the
One divider resistance R1 selects 1% accuracy resistance that resistance value is 1M, and the second external resistance R2 and the external resistance R3 of third select resistance respectively
It is worth 1% accuracy resistance for 100K and 50K.
Preferably, the frequency circuit of trembling further includes BOOT circuits, and the BOOT circuits include the electricity of the 4th resistance R4 and second
Hold C2, the BOOT ports of one end connection DC-DC power source chip U1 of the 4th resistance R4, the other end connection second of the 4th resistance R4
One end of capacitance C2, the other end connection power output end of the second capacitance C2.Wherein, the resistance value of the 4th resistance R4 selects 4K, the
The capacitance of two capacitance C2 selects 100nF.
Preferably, the frequency circuit of trembling further includes accumulator, and the accumulator includes the first inductance L1, the first inductance
One end of L1 connects the other end of the second capacitance C2, the other end connection power output end of the first inductance L1.Wherein, the first inductance
The inductance value of L1 selects 15 μ H.
Preferably, the frequency circuit of trembling further includes protection circuit, and the protection circuit includes the first sustained diode 1, the
The plus earth of one sustained diode 1, the cathode of the first sustained diode 1 connect one end of the first inductance L1, are also connected with the
One end of the other end of two capacitance C2 and the first coupled capacitor C1.Wherein, the model of the first sustained diode 1 is selected as SK34.
Preferably, the frequency circuit of trembling further includes voltage calibration circuit, and the voltage calibration circuit includes the 5th resistance R5
With the 6th resistance R6, one end of the 5th resistance R5 connects the other end of the first inductance L1, is also connected with power output end, the 5th resistance
The other end of R5 connects one end of the 6th resistance R6, is also connected with the FB ports of DC-DC power source chip U1, and the 6th resistance R6's is another
End ground connection.Wherein, the 5th resistance R5 is selected as 1% accuracy resistance that resistance value is 100K, and the 6th resistance R6 is selected as 1% that resistance value is 16K
Accuracy resistance.
Preferably, the frequency circuit of trembling further includes soft starting circuit, and the soft starting circuit includes third capacitance C3, third
The SS ports of one end connection DC-DC power source chip U1 of capacitance C3, the other end of third capacitance C3 connect the second external resistance R2,
The other end of third capacitance C3 is also grounded.Wherein, the capacitance of third capacitance C3 selects 2.2nF.
The integrated circuit workflow for trembling frequency circuit that the DC-DC power source of this preferred embodiment inhibits radiation dispersion exceeded is such as
Under：
V_IN provides the input step voltage of power supply, and V-OUT is then the output terminal of power supply, and drawing high POWER_EN by control makes DC-
DC power supply chip U1 works on power；The speed of the transmission of third capacitance C3 setting DC-DC power source chips U1 in soft starting circuit
Speed；DC-DC power source chip U1 obtains original frequency F by the second external resistance R2 and the external resistance R3 of third simultaneously；It is internal
Concussion is made after starting work, the SW pins output square-wave voltage of DC-DC power source chip U1；Pass through the 4th resistance R4 in BOOT circuits
High voltage is obtained with the BOOT pins coupled to DC-DC power source chip U1 of the second capacitance C2, is made inside DC-DC power source chip U1
Metal-oxide-semiconductor steady operation；Circuit is protected to pass through during the energy storage and release of the first inductance L1 in parallel with the first inductance L1
First sustained diode 1 is discharged, and prevents from burning out remaining element in circuit；The another way of the SW pins of DC-DC power source chip U1 is led to
Overcoupled circuits, bleeder circuit and RT_TERM circuits start above-mentioned frequency of trembling and work；It can pass through the in voltage calibration circuit the 5th simultaneously
Resistance R5 and the 6th resistance R6 carrys out collection voltages to control the duty ratio of PWM, adjusts output voltage；The square wave frequency of SW pins at this time
Rate changes due to internal frequency shift；The radiation of radiation dispersion reduces.Also, when chip is in zero load, termination power,
Bleeder circuit and RT_TERM circuits will not participate in work.
Also, DC-DC power source provided in this embodiment inhibit radiation dispersion it is exceeded tremble frequency circuit in practical utilization,
Its operation is stable and radiation have the reduction of 10-15dB (μ V/m), can effectively meet bound requirements of all kinds of depots to EMC.Value
The model LMR14030SDDA of the DC-DC power source chip integrated, the present embodiment uses is obtained, certainly in other embodiment
In, other different models but the DC-DC power source chip with identical function can also be used, the present invention does not limit this.
In conclusion DC-DC power source provided by the invention inhibit radiation dispersion it is exceeded tremble frequency circuit, including DC-DC
Power supply chip, termination power, bleeder circuit and RT_TERM circuits, one end connection DC-DC power source chip of termination power obtain shake
Square wave voltage signal is swung, the other end of termination power is coupled to bleeder circuit and obtains the first fluctuation voltage signal, the first fluctuation electricity
Pressure signal obtains the second fluctuation voltage signal by RT_TERM circuits, and the second fluctuation voltage signal is transferred to DC-DC power source chip
Generate the frequency of shake.So as to which the present invention can make its switching frequency one by the switching frequency of adjust automatically DC-DC power source
It is shaken in fixed range, realizes radiant energy distribution in certain frequency range to reduce the radiation energy of single-point.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that including DC-DC power source chip, coupling
Circuit, bleeder circuit and RT_TERM circuits are closed, one end connection DC-DC power source chip of termination power obtains concussion square-wave voltage
Signal, the other end of termination power are coupled to bleeder circuit and obtain the first fluctuation voltage signal, and the first fluctuation voltage signal passes through
RT_TERM circuits obtain the second fluctuation voltage signal, and the second fluctuation voltage signal is transferred to DC-DC power source chip and generates shake
Frequency.
2. DC-DC power source according to claim 1 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
Termination power includes the first coupled capacitor, the SW ports of one end connection DC-DC power source chip of the first coupled capacitor, the first coupling
The other end connection bleeder circuit of capacitance.
3. DC-DC power source according to claim 2 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
Bleeder circuit includes the first divider resistance, and one end of the first divider resistance connects the other end of the first coupled capacitor, the first partial pressure
The other end connection RT_TERM circuits of resistance.
4. DC-DC power source according to claim 3 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
RT_TERM circuits include the second external resistance and the external resistance of third, one end connection DC-DC power source chip of the external resistance of third
RT/SYNC ports, the other end of the external resistance of third connect the second external resistance one end and the first divider resistance it is another
End, the other end ground connection of the second external resistance.
5. DC-DC power source according to claim 4 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
It trembles frequency circuit and further includes BOOT circuits, the BOOT circuits include the 4th resistance and the second capacitance, and one end of the 4th resistance connects
The BOOT ports of DC-DC power source chip, the other end of the 4th resistance connect one end of the second capacitance, and the other end of the second capacitance connects
Connect power output end.
6. DC-DC power source according to claim 5 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
It trembles frequency circuit and further includes accumulator, the accumulator includes the first inductance, and one end of the first inductance connects the second capacitance
The other end, the other end connection power output end of the first inductance.
7. DC-DC power source according to claim 6 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
It trembles frequency circuit and further includes protection circuit, the protection circuit includes the first fly-wheel diode, and the anode of the first fly-wheel diode connects
Ground, the cathode of the first fly-wheel diode connect one end of the first inductance, the other end for being also connected with the second capacitance and the first coupling electricity
One end of appearance.
8. DC-DC power source according to claim 7 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
It trembles frequency circuit and further includes voltage calibration circuit, the voltage calibration circuit includes the 5th resistance and the 6th resistance, the 5th resistance
One end connects the other end of the first inductance, is also connected with power output end, one end of the other end the 6th resistance of connection of the 5th resistance,
It is also connected with the FB ports of DC-DC power source chip, the other end ground connection of the 6th resistance.
9. DC-DC power source according to claim 8 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
It trembles frequency circuit and further includes soft starting circuit, the soft starting circuit includes third capacitance, one end connection DC-DC electricity of third capacitance
The SS ports of source chip, the other end of third capacitance connect the second external resistance, and the other end of third capacitance is also grounded.
10. DC-DC power source according to claim 1 inhibit radiation dispersion it is exceeded tremble frequency circuit, which is characterized in that it is described
The model LMR14030SDDA of DC-DC power source chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810014918.XA CN108173428A (en) | 2018-01-08 | 2018-01-08 | A kind of DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810014918.XA CN108173428A (en) | 2018-01-08 | 2018-01-08 | A kind of DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit |
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| CN108173428A true CN108173428A (en) | 2018-06-15 |
Family
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| CN201810014918.XA Pending CN108173428A (en) | 2018-01-08 | 2018-01-08 | A kind of DC-DC power source inhibit radiation dispersion it is exceeded tremble frequency circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113364250A (en) * | 2021-07-15 | 2021-09-07 | 深圳市泰昂能源科技股份有限公司 | Control circuit and method of frequency jittering circuit |
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| CN2877127Y (en) * | 2005-12-01 | 2007-03-07 | 崇贸科技股份有限公司 | Control circuit with frequency modulation for decreasing electromagnetic interference of power converter |
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| US20140292300A1 (en) * | 2013-03-29 | 2014-10-02 | Virginia Tech Intellectual Properties, Inc. | V+hu 2 +l Power Converter Control with Capacitor Current Ramp Compensation |
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| CN113364250A (en) * | 2021-07-15 | 2021-09-07 | 深圳市泰昂能源科技股份有限公司 | Control circuit and method of frequency jittering circuit |
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Application publication date: 20180615 |