CN106374742A - Switching power supply output frequency regulating circuit - Google Patents
Switching power supply output frequency regulating circuit Download PDFInfo
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- CN106374742A CN106374742A CN201610980091.9A CN201610980091A CN106374742A CN 106374742 A CN106374742 A CN 106374742A CN 201610980091 A CN201610980091 A CN 201610980091A CN 106374742 A CN106374742 A CN 106374742A
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- power supply
- frequency
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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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—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 with automatic control of output voltage or current, e.g. switching regulators with digital control
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a switching power supply output frequency regulating circuit which comprises a detection module and a regulation module. A first input end of the detection module receives a feedback voltage; a second input end of the detection module receives a sampling control pulse signal; a third input end of the detection module receives a first reference voltage, and an output end of the detection module outputs an error detection amplification signal; a first input end of the regulation module receives the error detection amplification signal, a second input end of the regulation module receives a second reference voltage, a third input end of the regulation module receives a frequency control voltage, and an output end of the regulation module outputs a frequency regulation voltage; and when a voltage of the error detection amplification signal is higher than the second reference voltage, the frequency regulation voltage is lower than the frequency control voltage, and when the voltage of the error detection amplification signal is not higher than the second reference voltage, the frequency regulation voltage is equal to the frequency control voltage. According to the switching power supply output frequency regulating circuit disclosed by the invention, a switching frequency of a power switch is improved, and effects of eliminating audio noise, improving system efficiency and promoting a system response speed are achieved.
Description
Technical field
The present invention relates to a kind of Switching Power Supply output frequency adjusts circuit.
Background technology
It is known that in switch power supply system, during power switch conducting, input power charges to energy storage inductor, power switch
During disconnection, energy storage inductor is to load discharge.Generally control circuit can be designed to make the switching frequency of power switch and Switching Power Supply system
System output current is directly proportional, by setting a frequency control voltage, for energy storage inductor when setting each power switch conducting
The peak value of charging current, thus also setting the output current of switch power supply system, and the switching frequency of power switch.
For traditional control circuit, when the load reduction of switch power supply system, when that is, output current reduces, power is opened
The switching frequency closing also decreases.When switching frequency drops to tonal range, system can produce audio-frequency noise.Especially work as and open
Close power supply load reduction to during close zero load, switching frequency significantly reduces, and power-supply system efficiency can be led to significantly reduce, and be
System response speed is significantly deteriorated.
Content of the invention
The technical problem to be solved in the present invention is to overcome drawbacks described above present in prior art, providing a kind of switch
Power supply output frequency adjusts circuit.
The present invention is to solve above-mentioned technical problem by following technical proposals:
The invention provides a kind of Switching Power Supply output frequency adjusts circuit, its feature is, including detection module and tune
Section module, the input power of Switching Power Supply is charged to an energy storage inductor by a power switch；
The first input end of described detection module receives a feedback voltage, the magnitude of voltage of described feedback voltage and Switching Power Supply
System output voltage becomes fixed proportion；Second input of described detection module receives a controlling of sampling pulse signal, described adopts
Sample control wave is identical with the switching frequency of described power switch；3rd input of described detection module receives one first
Reference voltage, signal is amplified in outfan output one error-detecting of described detection module；
The first input end of described adjustment module receives described error-detecting and amplifies signal, and the second of described adjustment module is defeated
Enter end and receive one second reference voltage, the 3rd input of described adjustment module receives a frequency control voltage, described regulation mould
Outfan output one frequency of block adjusts voltage；
When the voltage that signal is amplified in described error-detecting is higher than described second reference voltage, it is low that described frequency adjusts voltage
In described frequency control voltage, when the voltage that signal is amplified in described error-detecting is not higher than described second reference voltage, described
Frequency adjusts voltage and is equal to described frequency control voltage.
It is preferred that when the voltage that signal is amplified in described error-detecting is higher than described second reference voltage, described frequency control
Difference between voltage processed and described frequency regulation voltage amplifies the voltage of signal and described second reference with described error-detecting
It is in a fixed proportion between the difference of voltage.
It is preferred that described detection module includes the first transistor, the first electric capacity, amplifier, first resistor, second resistance；
The source electrode of described the first transistor receives described feedback voltage and is sampled, and drain electrode connects described first electric capacity
One end, to obtain sampled voltage, grid receives described controlling of sampling pulse signal；
The other end ground connection of described first electric capacity；
The in-phase input end of described amplifier receives described sampled voltage, and inverting input is simultaneously connected with described first resistor
One end and described second resistance one end, outfan is connected with the other end of described second resistance, and exports described error inspection
The big signal of measuring；
The other end of described first resistor receives described first reference voltage.
It is preferred that described the first transistor is managed for pmos.
It is preferred that described adjustment module include transistor seconds, third transistor, the 4th transistor, the 5th transistor,
Six transistors, the 7th transistor, the 8th transistor, the 9th transistor, the tenth transistor, the 11st transistor, the 12nd crystal
Pipe, the 13rd transistor, the 14th transistor, the 15th transistor, the 16th transistor, the 17th transistor, the 18th crystalline substance
Body pipe, the 19th transistor, the 20th transistor, the 21st transistor, 3rd resistor, the 4th resistance, the 5th resistance, the 6th
Resistance；
Described Switching Power Supply output frequency adjusts circuit and is powered by a power supply, the source electrode of described transistor seconds
Connect described power supply, grid receives an outside bias voltage, drain and be simultaneously connected with one end of described 3rd resistor and described
The 4th resistance one end；
The source electrode of described third transistor is connected with the other end of described 3rd resistor, and grid receives described error-detecting and puts
Big signal, drain electrode is connected with the drain and gate of described 5th transistor；
The source electrode of described 4th transistor is connected with the other end of described 4th resistance, and grid receives described second with reference to electricity
Pressure, drain electrode is connected with the drain and gate of described 6th transistor；
The source ground of described 5th transistor；
The source ground of described 6th transistor；
The source ground of described 7th transistor, grid is connected with the grid of described 5th transistor, drain electrode and described the
The drain and gate of nine transistors is connected；
The source ground of described 8th transistor, grid is connected with the grid of described 6th transistor, drain electrode and described the
One end of five resistance is connected；
The source electrode of described 9th transistor connects described power supply；
The source electrode of described tenth transistor connects described power supply, and grid is connected with the grid of described 9th transistor, leakage
Pole is connected with the drain electrode of described 11st transistor；
The grid of described 11st transistor and the grid of described 21st transistor and drain electrode are connected, source electrode with described
The other end of the 5th resistance is connected, and the described frequency of output adjusts voltage；
The source electrode of described tenth two-transistor connects described power supply, and grid receives described bias voltage, and drain electrode connects simultaneously
Connect the source electrode of described 13rd transistor and the source electrode of the 14th transistor；
The grid of described 13rd transistor receives described frequency control voltage, the leakage of drain electrode and described 15th transistor
Pole is connected with grid；
The grid of described 14th transistor is connected with the source electrode of described 21st transistor, drain electrode and the described 16th
The drain and gate of transistor is connected；
The source ground of described 15th transistor；
The source ground of described 16th transistor；
The source ground of described 17th transistor, grid is connected with the grid of described 16th transistor, drains and institute
The grid stating the 19th transistor is connected with drain electrode；
The source ground of described 18th transistor, grid is connected with the grid of described 15th transistor, drains and institute
The source electrode stating the 21st transistor is connected, and produces one and follows voltage；
The source electrode of described 19th transistor connects described power supply；
The source electrode of described 20th transistor connects described power supply, the grid phase of grid and described 19th transistor
Even, drain electrode is connected with the drain electrode of described 21st transistor；
One end of described 6th resistance is connected with the source electrode of described 11st transistor, and the other end is brilliant with the described 21st
The source electrode of body pipe is connected.
It is preferred that described transistor seconds, described third transistor, described 4th transistor, described 9th transistor, institute
State the tenth transistor, described tenth two-transistor, described 13rd transistor, described 14th transistor, described 19th crystalline substance
Body pipe, described 20th transistor are pmos pipe；
Described 5th transistor, described 6th transistor, described 7th transistor, described 8th transistor, the described tenth
One transistor, described 15th transistor, described 16th transistor, described 17th transistor, described 18th transistor,
Described 21st transistor is nmos pipe.
It is preferred that described Switching Power Supply output frequency adjusts circuit also includes the second electric capacity, one end of described second electric capacity
Drain electrode with described 8th transistor is connected, and the other end is connected with the drain electrode of described 18th transistor.
The positive effect of the present invention is: the Switching Power Supply output frequency of the present invention adjusts circuit, detection switch electricity
The output voltage of origin system, judges the decline degree of the output current of switch power supply system, and then produces a relatively low frequency
Adjust voltage alternative frequency control voltage to set energy storage inductor charging peaks, improve the switching frequency of power switch, finally real
Now eliminate audio-frequency noise, improve system effectiveness and lift system response speed.
Brief description
Fig. 1 is the electrical block diagram of the Switching Power Supply output frequency regulation circuit of presently preferred embodiments of the present invention.
Specific embodiment
Further illustrate the present invention below by the mode of embodiment, but therefore do not limit the present invention to described reality
Apply among a scope.
As shown in figure 1, the Switching Power Supply output frequency of the present invention adjusts circuit includes detection module 101 and adjustment module
102, the input power of Switching Power Supply is charged to an energy storage inductor by a power switch；
The first input end of described detection module 101 receives a feedback voltage vfb, the magnitude of voltage of described feedback voltage vfb
Become fixed proportion with switch power supply system output voltage；Second input of described detection module receives a controlling of sampling pulse letter
Number vsw, described controlling of sampling pulse signal vsw are identical with the switching frequency of described power switch；The 3rd of described detection module
Input receives one first reference voltage vr1, and signal veer is amplified in outfan output one error-detecting of described detection module；
The first input end of described adjustment module 102 receives described error-detecting and amplifies signal veer, described adjustment module
102 the second input receives one second reference voltage vr2, and the 3rd input of described adjustment module 102 receives a frequency control
Voltage vc1 processed, outfan output one frequency of described adjustment module 102 adjusts voltage vc2；
When the voltage that signal veer is amplified in described error-detecting is higher than described second reference voltage vr2, described frequency is adjusted
Economize on electricity pressure vc2 is less than described frequency control voltage vc1, and described frequency control voltage vc1 and described frequency adjust voltage vc2 it
Between difference and described error-detecting amplify solid in one between the voltage of signal veer and the difference of described second reference voltage vr2
Certainty ratio, when the voltage that signal veer is amplified in described error-detecting is not higher than described second reference voltage vr2, described frequency is adjusted
Economize on electricity pressure vc2 is equal to described frequency control voltage vc1.
Described detection module 101 include the first transistor m1, the first electric capacity c1, amplifier amp, first resistor r1, second
Resistance r2；
The source electrode of described the first transistor m1 receives described feedback voltage vfb and it is sampled, described first crystal
The drain electrode of pipe m1 connects one end of described first electric capacity c1, to obtain sampled voltage vfbs, the grid of described the first transistor m1
Receive described controlling of sampling pulse signal vsw；
The other end ground connection of described first electric capacity c1；
The in-phase input end of described amplifier amp receives described sampled voltage vfbs, and inverting input is simultaneously connected with described
One end of first resistor r1 and one end of described second resistance r2, outfan is connected with the other end of described second resistance r2, and
Export described error-detecting and amplify signal veer；
The other end of described first resistor r1 receives described first reference voltage vr1.
Preferably, described the first transistor m1 manages for pmos.
Described adjustment module 102 includes transistor seconds m2, third transistor m3, the 4th transistor m4, the 5th transistor
M5, the 6th transistor m6, the 7th transistor m7, the 8th transistor m8, the 9th transistor m9, the tenth transistor m10, the 11st crystalline substance
Body pipe m11, the tenth two-transistor m12, the 13rd transistor m13, the 14th transistor m14, the 15th transistor m15, the tenth
Six transistor m16, the 17th transistor m17, the 18th transistor m18, the 19th transistor m19, the 20th transistor m20,
21st transistor m21,3rd resistor r3, the 4th resistance r4, the 5th resistance r5, the 6th resistance r6；
Described Switching Power Supply output frequency adjusts circuit and is powered by a power supply, the source of described transistor seconds m2
Pole connects described power supply, and grid receives the bias voltage vb outside, and drain electrode is simultaneously connected with one end of described 3rd resistor r3
One end with the 4th described resistance r4；
The source electrode of described third transistor m3 is connected with the other end of described 3rd resistor r3, and grid receives described error inspection
Measuring big signal veer, drain electrode is connected with the drain and gate of described 5th transistor m5；
The source electrode of described 4th transistor m4 is connected with the other end of described 4th resistance r4, and grid receives described second ginseng
Examine voltage vr2, drain electrode is connected with the drain and gate of described 6th transistor m6；
The source ground of described 5th transistor m5；
The source ground of described 6th transistor m6；
The source ground of described 7th transistor m7, grid is connected with the grid of described 5th transistor m5, drains and institute
The drain and gate stating the 9th transistor m9 is connected；
The source ground of described 8th transistor m8, grid is connected with the grid of described 6th transistor m6, drains and institute
The one end stating the 5th resistance r5 is connected；
The source electrode of described 9th transistor m9 connects described power supply；
The source electrode of described tenth transistor m10 connects described power supply, the grid phase of grid and described 9th transistor m9
Even, drain electrode is connected with the drain electrode of described 11st transistor m11；
The grid of described 11st transistor m11 is connected with the grid of described 21st transistor m21 and drain electrode, source electrode
It is connected with the other end of described 5th resistance r5, the described frequency of output adjusts voltage vc2；
The source electrode of described tenth two-transistor m12 connects described power supply, and grid receives described bias voltage vb, and drain electrode is same
When connect the source electrode of described 13rd transistor m13 and the source electrode of the 14th transistor m14；
The grid of described 13rd transistor m13 receives described frequency control voltage vc1, drain electrode and described 15th crystal
The drain and gate of pipe m15 is connected；
The grid of described 14th transistor m14 is connected with the source electrode of described 21st transistor m21, drain electrode with described
The drain and gate of the 16th transistor m16 is connected；
The source ground of described 15th transistor m15；
The source ground of described 16th transistor m16；
The source ground of described 17th transistor m17, grid is connected with the grid of described 16th transistor m16, leakage
Pole is connected with the grid of described 19th transistor m19 and drain electrode；
The source ground of described 18th transistor m18, grid is connected with the grid of described 15th transistor m15, leakage
Pole is connected with the source electrode of described 21st transistor m21, produces one and follows voltage vbuf；
The source electrode of described 19th transistor m19 connects described power supply；
The source electrode of described 20th transistor m20 connects described power supply, the grid of grid and described 19th transistor m19
Extremely connected, drain electrode is connected with the drain electrode of described 21st transistor m21；
One end of described 6th resistance r6 is connected with the source electrode of described 11st transistor m11, the other end and described second
The source electrode of 11 transistor m21 is connected.
Described transistor seconds m2, described third transistor m3, described 4th transistor m4, described 9th transistor m9,
Described tenth transistor m10, described tenth two-transistor m12, described 13rd transistor m13, described 14th transistor
M14, described 19th transistor m19, described 20th transistor m20 are pmos pipe；
Described 5th transistor m5, described 6th transistor m6, described 7th transistor m7, described 8th transistor m8,
Described 11st transistor m11, described 15th transistor m15, described 16th transistor m16, described 17th transistor
M17, described 18th transistor m18, described 21st transistor m21 are nmos pipe.
Described Switching Power Supply output frequency adjusts circuit and also includes the second electric capacity c2, one end of described second electric capacity c2 and institute
The drain electrode stating the 8th transistor m8 is connected, and the other end is connected with the drain electrode of described 18th transistor m18.
It is as follows that the Switching Power Supply output frequency of the present invention adjusts circuit concrete operating principle:
Switch power supply system can maintain the output voltage of setting under the control of control circuit, substantially former according to control theory
Reason, for limited Isobarically Control loop gain, deposits between Switching Power Supply actual output voltage and the target output voltage of setting
In the output voltage error of non-zero, output voltage error amplitude is inversely proportional to Isobarically Control loop gain.Work as switch power supply system
During load reduction, switch power supply output current reduces, and Isobarically Control loop gain increases, and output voltage error amplitude reduces, and opens
Close power supply actual output voltage to raise.Therefore detection switch power supply actual output voltage can be passed through, to judge that Switching Power Supply is defeated
Go out electric current.Because switch power source output voltage error is less, need amplifying circuit that it is amplified.
In switch power supply system, when inductance is to load discharge, switch power source output voltage can pass through induction coil
Produce the feedback voltage vfb of fixed proportion, detection module 101 receives feedback voltage vfb, controlling of sampling pulse signal vsw's
Under control, feedback voltage vfb is sampled, the first transistor m1 is used as sampling switch, when inductance is to load discharge, sampling
Control wave controls the first transistor m1 conducting, switch power source output voltage information is stored on the first electric capacity c1, obtains
To sampled voltage vfbs.
First reference voltage vr1 represents the target output voltage of Switching Power Supply setting, its difference with sampled voltage vfbs
Value just reflects switch power source output voltage error.Amplifier amp and first resistor r1, second resistance r2 composition amplify electricity
Road, is amplified to the difference of the first reference voltage vr1 and sampled voltage vfbs, produces error-detecting and amplifies signal verr, with
Switch power supply output current changes.
Adjustment module 102 receives error-detecting and amplifies signal verr, amplifies the rising of signal verr with error-detecting,
The frequency obtaining a reduction on the basis of frequency control voltage vc1 adjusts voltage vc2, carrys out alternative frequency control voltage vc1 and uses
Make to set energy storage inductor charging peaks, thus improving the switching frequency of power switch.
Third transistor m3 and the 4th transistor m4 constitute differential pair transconductance, and signal verr and second is amplified in error-detecting
The difference of reference voltage vr2 is converted into difference current at 3rd resistor r3, the 4th resistance r4 two ends, is arrived by the 5th transistor m5
The mirror image of the tenth transistor m10 current mirror, difference current is exported to the 6th resistance r6.The pressure drop at the 6th resistance r6 two ends is
(verr-vr2) * k1*k2, wherein k1 are ratio r6/ (r3+r4) of resistance value, and k2 is the ratio of current mirror.
Tenth two-transistor constitutes voltage follower, receives frequency control voltage vc1 to the 20th transistor, obtains amplitude
Identical follows voltage vbuf, provides driving current for the 6th resistance r6.Therefore have
(vc1-vc2)=(verr-vr2) * k1*k2
By suitably adjusting the second reference voltage vr2, and two coefficients of k1, k2, voltage can be adjusted with regulating frequency
Vc2 amplifies the variation relation of signal verr with error-detecting, thus the switching frequency realizing power switch to follow Switching Power Supply defeated
Go out curent change.
11st transistor m11 is used as source follower, and the 21st transistor is used as the biasing of source follower, makes frequency
Rate adjusts voltage vc2 and is not higher than frequency control voltage vc1, thus ensureing the power switch when switch power supply output current is larger
Switching frequency will not infinitely reduce.
The electric current of the 8th transistor m8 produces a minimum voltage on the 5th resistance r5, thus ensureing defeated in Switching Power Supply
Go out electric current will not infinitely raise compared with the switching frequency that one-hour rating switchs.
Second electric capacity c2 is used as the loop of burning voltage follower, is used simultaneously as stablizing the output that frequency adjusts voltage vc2.
By above technological means, the Switching Power Supply output frequency of the present invention adjusts circuit, detection switch power-supply system
Output voltage, judges the decline degree of the output current of switch power supply system, and then produces a relatively low frequency regulation voltage
Alternative frequency control voltage, to set energy storage inductor charging peaks, improves the switching frequency of power switch, and final realization eliminates sound
Frequency noise, raising system effectiveness and lift system response speed.
Above in association with accompanying drawing embodiment, the present invention is described in detail, those of ordinary skill in the art can be according to above-mentioned
Illustrate to make many variations to the present invention.Thus, some details in embodiment should not constitute limitation of the invention, the present invention
By the scope being defined using appended claims as protection scope of the present invention.
Although the foregoing describing the specific embodiment of the present invention, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
On the premise of the principle and essence of the present invention, various changes or modifications can be made to these embodiments, but these changes
Each fall within protection scope of the present invention with modification.
Claims (7)
1. a kind of Switching Power Supply output frequency adjusts circuit it is characterised in that including detection module and adjustment module, Switching Power Supply
Input power by a power switch, one energy storage inductor is charged；
The first input end of described detection module receives a feedback voltage, the magnitude of voltage of described feedback voltage and switch power supply system
Output voltage becomes fixed proportion；Second input of described detection module receives a controlling of sampling pulse signal, described sampling control
Pulse signal processed is identical with the switching frequency of described power switch；3rd input of described detection module receives one first reference
Voltage, signal is amplified in outfan output one error-detecting of described detection module；
The first input end of described adjustment module receives described error-detecting and amplifies signal, the second input of described adjustment module
Receive one second reference voltage, the 3rd input of described adjustment module receives a frequency control voltage, described adjustment module
Outfan output one frequency adjusts voltage；
When the voltage that signal is amplified in described error-detecting is higher than described second reference voltage, described frequency adjusts voltage and is less than institute
State frequency control voltage, when the voltage that signal is amplified in described error-detecting is not higher than described second reference voltage, described frequency
Adjust voltage and be equal to described frequency control voltage.
2. Switching Power Supply output frequency as claimed in claim 1 adjusts circuit and amplifies it is characterised in that working as described error-detecting
When the voltage of signal is higher than described second reference voltage, described frequency control voltage and described frequency adjust the difference between voltage
And it is in a fixed proportion that described error-detecting is amplified between the voltage of signal and the difference of described second reference voltage.
3. Switching Power Supply output frequency as claimed in claim 1 adjusts circuit it is characterised in that described detection module includes the
One transistor, the first electric capacity, amplifier, first resistor, second resistance；
The source electrode of described the first transistor receives described feedback voltage and is sampled, and drain electrode connects the one of described first electric capacity
End, to obtain sampled voltage, grid receives described controlling of sampling pulse signal；
The other end ground connection of described first electric capacity；
The in-phase input end of described amplifier receives described sampled voltage, and inverting input is simultaneously connected with the one of described first resistor
Hold the one end with described second resistance, outfan is connected with the other end of described second resistance, and export described error-detecting and put
Big signal；
The other end of described first resistor receives described first reference voltage.
4. Switching Power Supply output frequency as claimed in claim 3 adjusts circuit it is characterised in that described the first transistor is
Pmos manages.
5. Switching Power Supply output frequency as claimed in claim 1 adjusts circuit it is characterised in that described adjustment module includes the
Two-transistor, third transistor, the 4th transistor, the 5th transistor, the 6th transistor, the 7th transistor, the 8th transistor,
Nine transistors, the tenth transistor, the 11st transistor, the tenth two-transistor, the 13rd transistor, the 14th transistor, the tenth
Five transistors, the 16th transistor, the 17th transistor, the 18th transistor, the 19th transistor, the 20th transistor,
21 transistors, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance；
Described Switching Power Supply output frequency adjusts circuit and is powered by a power supply, and the source electrode of described transistor seconds meets institute
State power supply, grid receives an outside bias voltage, drain and be simultaneously connected with one end and described the of described 3rd resistor
One end of four resistance；
The source electrode of described third transistor is connected with the other end of described 3rd resistor, and grid receives described error-detecting and amplifies letter
Number, drain electrode is connected with the drain and gate of described 5th transistor；
The source electrode of described 4th transistor is connected with the other end of described 4th resistance, and grid receives described second reference voltage,
Drain electrode is connected with the drain and gate of described 6th transistor；
The source ground of described 5th transistor；
The source ground of described 6th transistor；
The source ground of described 7th transistor, grid is connected with the grid of described 5th transistor, and drain electrode is brilliant with the described 9th
The drain and gate of body pipe is connected；
The source ground of described 8th transistor, grid is connected with the grid of described 6th transistor, and drain electrode is electric with the described 5th
One end of resistance is connected；
The source electrode of described 9th transistor connects described power supply；
The source electrode of described tenth transistor connects described power supply, and grid is connected with the grid of described 9th transistor, drain electrode with
The drain electrode of described 11st transistor is connected；
The grid of described 11st transistor is connected with the grid of described 21st transistor and drain electrode, source electrode and the described 5th
The other end of resistance is connected, and the described frequency of output adjusts voltage；
The source electrode of described tenth two-transistor connects described power supply, and grid receives described bias voltage, and drain electrode is simultaneously connected with institute
State the source electrode of the 13rd transistor and the source electrode of the 14th transistor；
The grid of described 13rd transistor receives described frequency control voltage, the drain electrode of drain electrode and described 15th transistor and
Grid is connected；
The grid of described 14th transistor is connected with the source electrode of described 21st transistor, drains and described 16th crystal
The drain and gate of pipe is connected；
The source ground of described 15th transistor；
The source ground of described 16th transistor；
The source ground of described 17th transistor, grid is connected with the grid of described 16th transistor, drain electrode and described the
The grid of 19 transistors is connected with drain electrode；
The source ground of described 18th transistor, grid is connected with the grid of described 15th transistor, drain electrode and described the
The source electrode of 21 transistors is connected, and produces one and follows voltage；
The source electrode of described 19th transistor connects described power supply；
The source electrode of described 20th transistor connects described power supply, and grid is connected with the grid of described 19th transistor, leakage
Pole is connected with the drain electrode of described 21st transistor；
One end of described 6th resistance is connected with the source electrode of described 11st transistor, the other end and described 21st transistor
Source electrode be connected.
6. Switching Power Supply output frequency as claimed in claim 5 adjusts circuit it is characterised in that described transistor seconds, institute
State third transistor, described 4th transistor, described 9th transistor, described tenth transistor, described tenth two-transistor, institute
State the 13rd transistor, described 14th transistor, described 19th transistor, described 20th transistor are pmos pipe；
Described 5th transistor, described 6th transistor, described 7th transistor, described 8th transistor, described 11st crystalline substance
Body pipe, described 15th transistor, described 16th transistor, described 17th transistor, described 18th transistor, described
21st transistor is nmos pipe.
7. Switching Power Supply output frequency as claimed in claim 5 adjusts circuit it is characterised in that described Switching Power Supply exports frequency
Rate adjusts circuit and also includes the second electric capacity, and one end of described second electric capacity is connected with the drain electrode of described 8th transistor, another
End is connected with the drain electrode of described 18th transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610980091.9A CN106374742B (en) | 2016-11-08 | 2016-11-08 | Switching Power Supply output frequency adjusts circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610980091.9A CN106374742B (en) | 2016-11-08 | 2016-11-08 | Switching Power Supply output frequency adjusts circuit |
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| CN114124004A (en) * | 2021-11-23 | 2022-03-01 | 上海天马微电子有限公司 | Signal processing circuit and signal processing device |
| CN116073656A (en) * | 2023-02-17 | 2023-05-05 | 无锡麟聚半导体科技有限公司 | Current regulating circuit and chip |
| CN117294142A (en) * | 2023-11-24 | 2023-12-26 | 上海英联电子科技有限公司 | voltage conversion circuit |
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