CN107947571A - A kind of DC DC Switching Power Supplies and its inductance are uttered long and high-pitched sounds removing method - Google Patents
A kind of DC DC Switching Power Supplies and its inductance are uttered long and high-pitched sounds removing method Download PDFInfo
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- CN107947571A CN107947571A CN201711118971.6A CN201711118971A CN107947571A CN 107947571 A CN107947571 A CN 107947571A CN 201711118971 A CN201711118971 A CN 201711118971A CN 107947571 A CN107947571 A CN 107947571A
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- switching power
- circuit
- switching signal
- switching
- voltage
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Classifications
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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
- 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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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)
- Dc-Dc Converters (AREA)
Abstract
Utter long and high-pitched sounds removing method the invention discloses a kind of DC DC Switching Power Supplies and its inductance, the Switching Power Supply includes：Switching power source control circuit, for producing switching signal SW；Switching Power Supply output filter circuit, the switching signal SW for switching power source control circuit to be produced are converted to steady dc voltage output；Reduction voltage circuit, is connected to the output terminal of the switching power source control circuit, for switching signal SW for it is high when switching signal voltage reduced, and switching signal SW for it is low when provide discharge path for burr filtering circuit；Burr filtering circuit, is connected between the reduction voltage circuit and ground, and the switching signal burr for will be above setting voltage when the switching signal SW is high is short-circuited to ground, and is bled off electric charge by the reduction voltage circuit when switching signal SW is low；The present invention can filter off DC DC Switching Power Supply particular frequency range electric currents, effectively eliminate the howling of inductance.
Description
Technical field
The present invention relates to utter long and high-pitched sounds and disappear in DC-DC switching techniques field, more particularly to a kind of DC-DC Switching Power Supplies and its inductance
Except method.
Background technology
Inductance, which is uttered long and high-pitched sounds, refers to occur the phenomenon that inductance sends the small hereby song of high frequency in DC-DC Switching Power Supplies, due to
Many electronic products all apply DC-DC Switching Power Supplies, so this phenomenon occurs in many electronic products, it makes original quiet
There is slight sound in the electric appliance of sound work, has seriously affected the squelch of user.
The principle of Switching Power Supply of the prior art is as shown in Figure 1, power supply chip U1 has two gate pin foot (doors in figure
Control foot), connect respectively two NMOS tube Q1 and Q2, gate pin output be PWM waveform, the PWM voltage waves be used for control Q1,
The turn-on and turn-off of Q2.L1 is energy storage inductor, and C1 is filtering voltage regulation capacitance, for stablizing the output voltage of rear end VOUT.
Since the principle of supply voltage switch conversion is to charge when being opened using Q1 to inductance L1, inductance L1 storages when Q2 is opened
The magnetic field energy deposited be converted to afterflow electric energy achieve the purpose that change voltage, so in Fig. 1 the tie point SW of Q1 and Q2 at understand because
The high-frequency switching switch of Q1 and Q2 and produce various mixed and disorderly frequency currents, these electric currents can cause inductance coil is faint to be total to
Shake, when the random current of 20~20KHz frequencies occurs in SW, the resonance noise of inductance L1 will be heard that here it is institute by human ear
Meaning is uttered long and high-pitched sounds.
Virtual voltage oscillogram at SW is as shown in Fig. 2, wherein left side is theoretical SW voltage waveforms, due to Switching Power Supply
Metal-oxide-semiconductor Q1, Q2 be PWM ripples opening and closing by certain frequency, so voltage SW at also can journey it is existing as Fig. 2 it is fixed frequently
Rate square wave.But because the resistance of the switch time delay and parasitic capacitance and metal-oxide-semiconductor of metal-oxide-semiconductor in itself etc., can make SW in actual work
Square wave there is noise, as shown on the right of Fig. 2, the be added to square wave of SW of noise voltage just produces the noise voltage of amplitude higher,
If the frequency range of this noise will be formed in 20~20KHz scopes and uttered long and high-pitched sounds.
It is usually to replace inductance or inductance gluing currently for the solution method that this inductance is uttered long and high-pitched sounds, makes inductance and noise
The resonance noise of electric current is without falling into the audible frequency range of human ear.But there is the dependence to device in this method.
The content of the invention
To overcome above-mentioned the shortcomings of the prior art, the purpose of the present invention be to provide a kind of DC-DC Switching Power Supplies and
Its inductance is uttered long and high-pitched sounds removing method, to filter off DC-DC Switching Power Supply particular frequency range electric currents, effectively eliminates the howling of inductance.
In order to achieve the above object, technical solution provided by the invention is as follows：
A kind of DC-DC Switching Power Supplies, including：
Switching power source control circuit, for producing switching signal SW；
Switching Power Supply output filter circuit, the switching signal SW for switching power source control circuit to be produced are converted to stabilization
Direct voltage output；
Reduction voltage circuit, is connected to the output terminal of the switching power source control circuit, for being incited somebody to action when switching signal SW is high
Switching signal voltage reduce, and switching signal SW for it is low when provide discharge path for burr filtering circuit；
Burr filtering circuit, is connected between the reduction voltage circuit and ground, for being incited somebody to action when the switching signal SW is high
Switching signal burr higher than setting voltage is short-circuited to ground, and switching signal SW for it is low when by the reduction voltage circuit by electric charge
Bleed off.
Further, the reduction voltage circuit includes a zener diode, and the cathode of the zener diode is connected to described
Switching power source control circuit output terminal, its anode connect the burr filtering circuit.
Further, the burr filtering circuit includes a burr Absorption Capacitance, and its one end connects the zener diode
Anode, the other end ground connection.
Further, the burr Absorption Capacitance perhaps uses the other capacitance of large, medium and small three orders of magnitude of capacitance for filtered electrical
It is in parallel.
Further, the switching power source control circuit includes power supply chip, a nmos switch pipe, a PMOS switch pipe,
First output terminal of the power supply chip is connected to the grid of the nmos switch pipe, and the second output terminal is connected to the PMOS and opens
The grid of pipe is closed, the drain electrode of the nmos switch pipe connects power supply, the grounded drain of the PMOS switch pipe, the nmos switch pipe
Source electrode, the source electrode of PMOS switch pipe is connected with the reduction voltage circuit, Switching Power Supply output filter circuit.
Further, the Switching Power Supply output filter circuit includes an energy storage inductor and filter capacitor, the energy storage electricity
One end of sense connects source electrode, the source electrode of PMOS switch pipe of the nmos switch pipe, one end of the other end and the filter capacitor
It is connected to form output voltage node, the other end ground connection of the filter capacitor.
To reach above-mentioned purpose, utter long and high-pitched sounds removing method the present invention also provides a kind of inductance of DC-DC Switching Power Supplies, including such as
Lower step：
Step 1, switching signal is produced using a switching power source control circuit；
Step 2, steady dc voltage output is converted to using a Switching Power Supply output filter circuit by switching signal；
Step 3, in switching signal to be converted to steady dc voltage output, is believed using a reduction voltage circuit in switch
Number for it is high when switching signal voltage is reduced, and switching signal for it is low when provide discharge path for a burr filtering circuit；
Step 4, the switching signal burr of setting voltage is will be above using a burr filtering circuit when switching signal is high
Ground is short-circuited to, and is bled off electric charge by the reduction voltage circuit when switching signal is low.
Further, the reduction voltage circuit is realized by a zener diode.
Further, the burr filtering circuit is realized by a burr Absorption Capacitance.
Further, the burr Absorption Capacitance perhaps uses the other electricity of large, medium and small three orders of magnitude of capacitance for a filtered electrical
Hold in parallel.
Compared with prior art, a kind of DC-DC Switching Power Supplies of the present invention and its inductance are uttered long and high-pitched sounds the beneficial effect of removing method
It is：
A kind of DC-DC Switching Power Supplies of the present invention and its inductance removing method of uttering long and high-pitched sounds pass through opening in switching power source control circuit
OFF signal output terminal is sequentially connected in series reduction voltage circuit, Switching Power Supply output filter circuit, and Switching Power Supply output filter circuit is connected to
Ground network, so as to make Switching Power Supply filter off particular frequency range electric current, effectively eliminates the howling of inductance.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of the DC-DC Switching Power Supplies of the prior art；
Fig. 2 is the oscillogram of the output SW of the switching power source control circuit of the prior art；
Fig. 3 is a kind of circuit structure diagram of one embodiment of DC-DC Switching Power Supplies of the present invention；
Fig. 4 is that a kind of inductance of DC-DC Switching Power Supplies of the present invention is uttered long and high-pitched sounds the step flow chart of removing method.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other can also be obtained according to these attached drawings
Attached drawing, and obtain other embodiments.
To make simplified form, part related to the present invention is only schematically show in each figure, they are not represented
Its practical structures as product.In addition, so that simplified form readily appreciates, there is identical structure or function in some figures
Component, only symbolically depicts one of those, or has only marked one of those.Herein, "one" is not only represented
" only this ", can also represent the situation of " more than one ".
In one embodiment of the invention, as shown in figure 3, a kind of DC-DC Switching Power Supplies of the present invention, including：Switch electricity
Source control circuit 10, Switching Power Supply output filter circuit 20, reduction voltage circuit 30 and burr filtering circuit 40.
Wherein, switching power source control circuit 10 includes power supply chip U1, nmos switch pipe Q1, PMOS switch pipe Q2 and its outer
Circuit is enclosed, for producing switching signal SW；Switching Power Supply output filter circuit 20 includes energy storage inductor L1 and filter capacitor C1, uses
Steady dc voltage output is converted in the switching signal SW for producing switching power source control circuit 10；Reduction voltage circuit 30, even
The output terminal of switching power source control circuit 10 is connected to, the reduction voltage circuit 30 includes zener diode D1, in switching signal
SW reduces switching signal voltage when being high, and is that burr filtering circuit 40 provides discharge path when switching signal SW is low；
Burr filtering circuit 40, is connected between the reduction voltage circuit 30 and ground, including a burr Absorption Capacitance C2, for believing in switch
Number SW will be above setting voltage switching signal burr when being high is short-circuited to ground, and switching signal SW for it is low when pass through and be depressured electricity
Road 30 bleeds off electric charge, and in the specific embodiment of the invention, burr Absorption Capacitance C2 is a filter capacitor, it is preferable that due to big
The high frequency characteristics of capacitance is poor, and burr Absorption Capacitance C2 can use the capacitance parallel connections of large, medium and small three orders of magnitude to reach optimal suction
Produce effects fruit.
Specifically, the first output terminal of power supply chip U1 is connected to the grid of nmos switch pipe Q1, and the of switch chip U1
Two output terminals are connected to the grid of PMOS switch pipe Q2, and the drain electrode of nmos switch pipe Q1 connects power supply Vin, the leakage of PMOS switch pipe Q2
Pole is grounded, the source electrode of nmos switch pipe Q1, the cathode and energy storage inductor of the source electrode of PMOS switch pipe Q2 and zener diode D1
One end of L1 is connected to form node SW, and the other end of energy storage inductor L1 is connected to form output voltage section with one end of filter capacitor C1
Point, the other end ground connection of filter capacitor C1, the anode of zener diode D1 are connected with one end of burr Absorption Capacitance C2, and burr is inhaled
Receive the other end ground connection of capacitance C2.
As it can be seen that the two pole D1 of a voltage stabilizing that the present invention is sequentially connected in series at the output node SW of switching power source control circuit 10
With a capacitance C2, and capacitance C2 is connected to ground network (being commonly called as GND), in actual design, it is only necessary to selected for D1 and C2
Suitable specification and capacitance can filter off the noise current that human ear can be heard, eliminate and vibrate from face, avoid uttering long and high-pitched sounds for inductance.
Illustrate that the DC-DC Switching Power Supplies of the present invention eliminate the principle that inductance is uttered long and high-pitched sounds below in conjunction with Fig. 3：
In the present invention, zener diode D1, that is, Zener diode or avalanche diode, the stable voltage of every kind of specification is not
Together, actual magnitude of voltage is selected according to the size of Vin.Here by taking the zener diode of 12V as an example, such as Fig. 3, voltage is small at SW
When 12V, high resistant state of value is just presented in voltage-stabiliser tube, and electric current would not flow to burr Absorption Capacitance C2 at SW, and voltage is big at SW
When 12V, the conducting resistance of zener diode D1 can diminish, and the electric current at SW is imported into burr Absorption Capacitance C2, but voltage stabilizing
The voltage that diode D1 can keep allowing at SW all the time is 12V, and the combination of such zener diode D1 and burr Absorption Capacitance C2 is just
The burr voltage on SW can only be filtered out.
Assuming that Vin is 12V, from the oscillogram of Fig. 2, the theoretical high level of PWM waveform is exactly 12V at SW, but due to
The parasitic parameter of metal-oxide-semiconductor, at SW the burr pulse of voltage waveform can exceed 12V, when these burr pulses are more than 12V, voltage stabilizing
The conduction resistance value of diode D1 will diminish, and the electric current allowed at SW is imported into burr Absorption Capacitance C2, burr Absorption Capacitance
C2 is a filter capacitor, its effect is for absorption of noise electric current, is eliminated the burr pulse voltage at SW.C2
Capacitance can be according to formula CC2=1/ (2 π * f*R) is obtained, and wherein R is the impedance value of circuit, and f is the frequency of burr voltage.
When burr voltage at SW is eliminated, uttering long and high-pitched sounds for inductance will disappear therewith.
Fig. 4 is that a kind of inductance of DC-DC Switching Power Supplies of the present invention is uttered long and high-pitched sounds the step flow chart of removing method.As shown in figure 4,
A kind of inductance of DC-DC Switching Power Supplies of the present invention is uttered long and high-pitched sounds removing method, is included the following steps：
Step 401, switching signal is produced using a switching power source control circuit.
Step 402, switching signal is converted into steady dc voltage output using a Switching Power Supply output filter circuit；
In the specific embodiment of the invention, the Switching Power Supply output filter circuit is realized by energy storage inductor and filter capacitor.
Step 403, in switching signal is converted to steady dc voltage output procedure, opened using a reduction voltage circuit
OFF signal for it is high when switching signal voltage is reduced, and switching signal for it is low when for a burr filtering circuit provides electric discharge lead to
Road, in the specific embodiment of the invention, the reduction voltage circuit is realized by a zener diode D1.
Step 404, the switching signal hair of setting voltage is will be above when switching signal is high using a burr filtering circuit
Thorn is short-circuited to ground, and is bled off electric charge by the reduction voltage circuit when switching signal is low, in the specific embodiment of the invention,
The burr filtering circuit is realized by a burr Absorption Capacitance.
In conclusion a kind of DC-DC Switching Power Supplies of the present invention and its inductance are uttered long and high-pitched sounds, removing method passes through in Switching Power Supply control
The switching signal output terminal of circuit processed is sequentially connected in series reduction voltage circuit, Switching Power Supply output filter circuit, and Switching Power Supply is exported and is filtered
Wave circuit is connected to ground network, so that Switching Power Supply filters off particular frequency range electric current, effectively eliminates the howling of inductance.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the preferred of the present invention
Embodiment, it is noted that for those skilled in the art, do not departing from the premise of the principle of the invention
Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of DC-DC Switching Power Supplies, including：
Switching power source control circuit, for producing switching signal SW；
Switching Power Supply output filter circuit, the switching signal SW for switching power source control circuit to be produced are converted to stable straight
Flow voltage output；
Reduction voltage circuit, is connected to the output terminal of the switching power source control circuit, for that will be switched when switching signal SW is high
Signal voltage reduce, and switching signal SW for it is low when provide discharge path for burr filtering circuit；
Burr filtering circuit, is connected between the reduction voltage circuit and ground, for will be above when the switching signal SW is high
The switching signal burr of setting voltage is short-circuited to ground, and is put electric charge by the reduction voltage circuit when switching signal SW is low
Fall.
2. a kind of DC-DC Switching Power Supplies as claimed in claim 1, it is characterised in that the reduction voltage circuit includes a voltage stabilizing two
Pole pipe, the cathode of the zener diode are connected to the switching power source control circuit output terminal, its anode connects the burr
Filtering circuit.
A kind of 3. DC-DC Switching Power Supplies as claimed in claim 2, it is characterised in that：The burr filtering circuit includes one mao
Absorption Capacitance is pierced, its one end connects the anode of the zener diode, other end ground connection.
A kind of 4. DC-DC Switching Power Supplies as claimed in claim 3, it is characterised in that：The burr Absorption Capacitance is filtered electrical
It is perhaps in parallel using the other capacitance of large, medium and small three orders of magnitude of capacitance.
A kind of 5. DC-DC Switching Power Supplies as claimed in claim 1, it is characterised in that：The switching power source control circuit includes
Power supply chip, a nmos switch pipe, a PMOS switch pipe, the first output terminal of the power supply chip are connected to the nmos switch
The grid of pipe, the second output terminal are connected to the grid of the PMOS switch pipe, and the drain electrode of the nmos switch pipe connects power supply, described
The grounded drain of PMOS switch pipe, the source electrode of the nmos switch pipe, the source electrode of PMOS switch pipe and the reduction voltage circuit, switch
Power supply output filter circuit connects.
A kind of 6. DC-DC Switching Power Supplies as claimed in claim 1, it is characterised in that：The Switching Power Supply output filter circuit
Including an energy storage inductor and filter capacitor, one end of the energy storage inductor connects the source electrode of the nmos switch pipe, PMOS switch
The source electrode of pipe, one end of the other end and the filter capacitor are connected to form output voltage node, the other end of the filter capacitor
Ground connection.
The removing method 7. a kind of inductance of DC-DC Switching Power Supplies is uttered long and high-pitched sounds, includes the following steps：
Step 1, switching signal is produced using a switching power source control circuit；
Step 2, steady dc voltage output is converted to using a Switching Power Supply output filter circuit by switching signal；
Step 3, in switching signal is converted to steady dc voltage output procedure, is believed using a reduction voltage circuit in switch
Number for it is high when switching signal voltage is reduced, and switching signal for it is low when provide discharge path for a burr filtering circuit；
Step 4, the switching signal burr short circuit of setting voltage is will be above using the burr filtering circuit when switching signal is high
To ground, and electric charge is bled off by the reduction voltage circuit when switching signal is low.
The removing method 8. a kind of inductance of DC-DC Switching Power Supplies as claimed in claim 7 is uttered long and high-pitched sounds, it is characterised in that the drop
Volt circuit is realized by zener diode.
The removing method 9. a kind of inductance of DC-DC Switching Power Supplies as claimed in claim 7 is uttered long and high-pitched sounds, it is characterised in that the hair
Thorn filtering circuit is realized by burr Absorption Capacitance.
The removing method 10. a kind of inductance of DC-DC Switching Power Supplies as claimed in claim 9 is uttered long and high-pitched sounds, it is characterised in that：The hair
It is in parallel perhaps using the other capacitance of large, medium and small three orders of magnitude of capacitance for filtered electrical to pierce Absorption Capacitance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711118971.6A CN107947571A (en) | 2017-11-14 | 2017-11-14 | A kind of DC DC Switching Power Supplies and its inductance are uttered long and high-pitched sounds removing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711118971.6A CN107947571A (en) | 2017-11-14 | 2017-11-14 | A kind of DC DC Switching Power Supplies and its inductance are uttered long and high-pitched sounds removing method |
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Cited By (1)
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| CN108737932A (en) * | 2018-05-23 | 2018-11-02 | 努比亚技术有限公司 | Terminal anti-utter long and high-pitched sounds method, terminal and computer readable storage medium |
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