CN106374742B - Switching Power Supply output frequency adjusts circuit - Google Patents
Switching Power Supply output frequency adjusts circuit Download PDFInfo
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- CN106374742B CN106374742B CN201610980091.9A CN201610980091A CN106374742B CN 106374742 B CN106374742 B CN 106374742B CN 201610980091 A CN201610980091 A CN 201610980091A CN 106374742 B CN106374742 B CN 106374742B
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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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Abstract
The invention discloses a kind of Switching Power Supply output frequencies to adjust circuit, including detection module and adjustment module；The first input end of detection module receives feedback voltage；Second input terminal of detection module receives controlling of sampling pulse signal；The third input terminal of detection module receives the first reference voltage, and the output end output error of detection module detects amplified signal；The first input end of adjustment module receives error-detecting amplified signal, and the second input terminal of adjustment module receives the second reference voltage, and the third input terminal of adjustment module receives frequency control voltage, and the output end output frequency of adjustment module adjusts voltage；When error-detecting amplified signal is higher than the second reference voltage, frequency adjusts voltage and is lower than frequency control voltage, and when the voltage of error-detecting amplified signal is not higher than the second reference voltage, frequency adjusts voltage and is equal to frequency control voltage.The present invention improves the switching frequency of power switch, realizes and eliminates audio-frequency noise, improves system effectiveness and lifting system response speed.
Description
Technical field
The present invention relates to a kind of Switching Power Supply output frequencies to adjust circuit.
Background technique
It is well known that input power charges to energy storage inductor when power switch is connected, power switch in switch power supply system
Energy storage inductor is to load discharge when disconnection.Usual control circuit can be designed to make the switching frequency of power switch and Switching Power Supply system
System output electric current is directly proportional, by setting a frequency control voltage, energy storage inductor when for setting the conducting of each power switch
The peak value of charging current, to also set the output electric 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, i.e., when output electric current reduces, power is opened
The switching frequency of pass also decreases.When switching frequency drops to tonal range, system can generate audio-frequency noise.Especially work as and opens
To close to when zero load, switching frequency significantly reduces powered-down source load reduction, will lead to the significant decrease of power-supply system efficiency, and be
System response speed is significantly deteriorated.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of switch to overcome drawbacks described above existing in the prior art
Power supply output frequency adjusts circuit.
The present invention is to solve above-mentioned technical problem by following technical proposals:
The present invention provides a kind of Switching Power Supply output frequencies to adjust circuit, it is characterized in that, including detection module and tune
Module is saved, the input power of Switching Power Supply charges to an energy storage inductor by a power switch；
The first input end of the detection module receives a feedback voltage, the voltage value and Switching Power Supply of the feedback voltage
System output voltage is at fixed proportion；Second input terminal of the detection module receives a controlling of sampling pulse signal, described to adopt
Sample control wave is identical as the switching frequency of the power switch；The third input terminal of the detection module receives one first
The output end of reference voltage, the detection module exports an error-detecting amplified signal；
The first input end of the adjustment module receives the error-detecting amplified signal, and the second of the adjustment module is defeated
Enter end and receive one second reference voltage, the third input terminal of the adjustment module receives a frequency control voltage, the adjusting mould
The output end of block exports a frequency and adjusts voltage；
When the voltage of the error-detecting amplified signal is higher than second reference voltage, it is low that the frequency adjusts voltage
It is described when the voltage of the error-detecting amplified signal is not higher than second reference voltage in the frequency control voltage
Frequency adjusts voltage and is equal to the frequency control voltage.
Preferably, when the voltage of the error-detecting amplified signal is higher than second reference voltage, the frequency control
Voltage processed and the frequency adjust the voltage of difference and the error-detecting amplified signal between voltage and described second and refer to
It is in a fixed proportion between the difference of voltage.
Preferably, the detection module includes the first transistor, first capacitor, amplifier, first resistor, second resistance；
The source electrode of the first transistor receives the feedback voltage and is sampled, and drain electrode connects the first capacitor
One end, to obtain sampled voltage, grid receives the controlling of sampling pulse signal；
The other end of the first capacitor is grounded；
The non-inverting input terminal of the amplifier receives the sampled voltage, and inverting input terminal connects the first resistor simultaneously
One end and the second resistance one end, output end is connected with the other end of the second resistance, and exports the error inspection
Survey amplified signal；
The other end of the first resistor receives first reference voltage.
Preferably, the first transistor is PMOS tube.
Preferably, the adjustment module includes second transistor, 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；
The Switching Power Supply output frequency adjusts circuit and is powered by a power supply, the source electrode of the second transistor
Connect the power supply, grid receives the bias voltage of an outside, drains while connecting one end of the 3rd resistor and described
The 4th resistance one end；
The source electrode of the third transistor is connected with the other end of the 3rd resistor, and grid receives the error-detecting and puts
Big signal, drain electrode are connected with the drain and gate of the 5th transistor；
The source electrode of 4th transistor is connected with the other end of the 4th resistance, and grid receives described second with reference to electricity
Pressure, drain electrode are connected with the drain and gate of the 6th transistor；
The source electrode of 5th transistor is grounded；
The source electrode of 6th transistor is grounded；
The source electrode of 7th transistor is grounded, and grid is connected with the grid of the 5th transistor, is drained and described the
The drain and gate of nine transistors is connected；
The source electrode of 8th transistor is grounded, and grid is connected with the grid of the 6th transistor, is drained and described the
One end of five resistance is connected；
The source electrode of 9th transistor connects the power supply；
The source electrode of tenth transistor connects the power supply, and grid is connected with the grid of the 9th transistor, leakage
Pole is connected with the drain electrode of the 11st transistor；
The grid of 11st transistor and the grid of the 21st transistor and drain electrode are connected, source electrode with it is described
The other end of 5th resistance is connected, and exports the frequency and adjusts voltage；
The source electrode of tenth two-transistor connects the power supply, and grid receives the bias voltage, drains while connecting
Connect the source electrode of the 13rd transistor and the source electrode of the 14th transistor；
The grid of 13rd transistor receives the frequency control voltage, the leakage of drain electrode and the 15th transistor
Pole is connected with grid；
The grid of 14th transistor is connected with the source electrode of the 21st transistor, drain electrode and the described 16th
The drain and gate of transistor is connected；
The source electrode of 15th transistor is grounded；
The source electrode of 16th transistor is grounded；
The source electrode of 17th transistor is grounded, and grid is connected with the grid of the 16th transistor, drain electrode and institute
The grid for stating the 19th transistor is connected with drain electrode；
The source electrode of 18th transistor is grounded, and grid is connected with the grid of the 15th transistor, drain electrode and institute
The source electrode for stating the 21st transistor is connected, and generates one and follows voltage；
The source electrode of 19th transistor connects the power supply；
The source electrode of 20th transistor connects the power supply, the grid phase of grid and the 19th transistor
Even, drain electrode is connected with the drain electrode of the 21st transistor；
One end of 6th resistance is connected with the source electrode of the 11st transistor, the other end and the 21st crystalline substance
The source electrode of body pipe is connected.
Preferably, the second transistor, the third transistor, the 4th transistor, the 9th transistor, institute
State the tenth transistor, the tenth two-transistor, the 13rd transistor, the 14th transistor, the 19th crystalline substance
Body pipe, the 20th transistor are PMOS tube；
5th transistor, the 6th transistor, the 7th transistor, the 8th transistor, the described tenth
One transistor, the 15th transistor, the 16th transistor, the 17th transistor, the 18th transistor,
21st transistor is NMOS tube.
Preferably, it further includes the second capacitor that the Switching Power Supply output frequency, which adjusts circuit, one end of second capacitor
It is connected with the drain electrode of the 8th transistor, the other end is connected with the drain electrode of the 18th transistor.
The positive effect of the present invention is that: Switching Power Supply output frequency of the invention adjusts circuit, detection switch electricity
The output voltage of source system, judges the decline degree of the output electric current of switch power supply system, and then generates a lower frequency
Voltage alternative frequency control voltage is adjusted to set energy storage inductor charging peaks, improves the switching frequency of power switch, it is final real
It now eliminates audio-frequency noise, improve system effectiveness and lifting system response speed.
Detailed description of the invention
Fig. 1 is that the Switching Power Supply output frequency of presently preferred embodiments of the present invention adjusts the electrical block diagram of circuit.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.
As shown in Figure 1, it includes detection module 101 and adjustment module that Switching Power Supply output frequency of the invention, which adjusts circuit,
102, the input power of Switching Power Supply charges to an energy storage inductor by a power switch；
The first input end of the detection module 101 receives a feedback voltage V FB, the voltage value of the feedback voltage V FB
With switch power supply system output voltage at fixed proportion；Second input terminal of the detection module receives controlling of sampling pulse letter
Number VSW, the controlling of sampling pulse signal VSW are identical as the switching frequency of the power switch；The third of the detection module
Input terminal receives one first reference voltage VR1, and the output end of the detection module exports an error-detecting amplified signal Veer；
The first input end of the adjustment module 102 receives the error-detecting amplified signal Veer, the adjustment module
102 the second input terminal receives one second reference voltage VR2, and the third input terminal of the adjustment module 102 receives a frequency control
Voltage VC1 processed, the output end of the adjustment module 102 export a frequency and adjust voltage VC2；
When the voltage of the error-detecting amplified signal Veer is higher than the second reference voltage VR2, the frequency tune
Save voltage VC2 and be lower than the frequency control voltage VC1, and the frequency control voltage VC1 and the frequency adjust voltage VC2 it
Between difference and the error-detecting amplified signal Veer voltage and the second reference voltage VR2 difference between it is solid in one
Certainty ratio, when the voltage of the error-detecting amplified signal Veer is not higher than the second reference voltage VR2, the frequency tune
It saves voltage VC2 and is equal to the frequency control voltage VC1.
The detection module 101 includes the first transistor M1, first capacitor C1, amplifier AMP, first resistor R1, second
Resistance R2；
The source electrode of the first transistor M1 receives the feedback voltage V FB and samples to it, the first crystal
The drain electrode of pipe M1 connects one end of the first capacitor C1, to obtain sampled voltage VFBS, the grid of the first transistor M1
Receive the controlling of sampling pulse signal VSW；
The other end of the first capacitor C1 is grounded；
The non-inverting input terminal of the amplifier AMP receives the sampled voltage VFBS, and inverting input terminal is simultaneously described in connection
One end of one end of first resistor R1 and the second resistance R2, output end are connected with the other end of the second resistance R2, and
Export the error-detecting amplified signal Veer；
The other end of the first resistor R1 receives the first reference voltage VR1.
Preferably, the first transistor M1 is PMOS tube.
The adjustment module 102 includes second transistor 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；
The Switching Power Supply output frequency adjusts circuit and is powered by a power supply, the source of the second transistor M2
Pole connects the power supply, and grid receives the bias voltage VB outside one, drain electrode while the one end for connecting the 3rd resistor R3
With one end of the 4th resistance R4；
The source electrode of the third transistor M3 is connected with the other end of the 3rd resistor R3, and grid receives the error inspection
Amplified signal Veer is surveyed, drain electrode is connected with the drain and gate of the 5th transistor M5；
The source electrode of the 4th transistor M4 is connected with the other end of the 4th resistance R4, and grid receives second ginseng
Voltage VR2 is examined, drain electrode is connected with the drain and gate of the 6th transistor M6；
The source electrode of the 5th transistor M5 is grounded；
The source electrode of the 6th transistor M6 is grounded；
The source electrode of the 7th transistor M7 is grounded, and grid is connected with the grid of the 5th transistor M5, drain electrode and institute
The drain and gate for stating the 9th transistor M9 is connected；
The source electrode of the 8th transistor M8 is grounded, and grid is connected with the grid of the 6th transistor M6, drain electrode and institute
The one end for stating the 5th resistance R5 is connected；
The source electrode of the 9th transistor M9 connects the power supply；
The source electrode of the tenth transistor M10 connects the power supply, the grid phase of grid and the 9th transistor M9
Even, drain electrode is connected with the drain electrode of the 11st transistor M11；
The grid of the 11st transistor M11 is connected with the grid of the 21st transistor M21 and drain electrode, source electrode
It is connected with the other end of the 5th resistance R5, exports the frequency and adjust voltage VC2；
The source electrode of the tenth two-transistor M12 connects the power supply, and grid receives the bias voltage VB, and drain electrode is same
When connect the source electrode of the 13rd transistor M13 and the source electrode of the 14th transistor M14；
The grid of the 13rd transistor M13 receives the frequency control voltage VC1, drain electrode and the 15th crystal
The drain and gate of pipe M15 is connected；
The grid of the 14th transistor M14 is connected with the source electrode of the 21st transistor M21, drain electrode with it is described
The drain and gate of 16th transistor M16 is connected；
The source electrode of the 15th transistor M15 is grounded；
The source electrode of the 16th transistor M16 is grounded；
The source electrode of the 17th transistor M17 is grounded, and grid is connected with the grid of the 16th transistor M16, is leaked
Pole is connected with the grid of the 19th transistor M19 and drain electrode；
The source electrode of the 18th transistor M18 is grounded, and grid is connected with the grid of the 15th transistor M15, is leaked
Pole is connected with the source electrode of the 21st transistor M21, generates one and follows voltage Vbuf；
The source electrode of the 19th transistor M19 connects the power supply；
The source electrode of the 20th transistor M20 connects the power supply, the grid of grid and the 19th transistor M19
Extremely it is connected, drain electrode is connected with the drain electrode of the 21st transistor M21；
One end of the 6th resistance R6 is connected with the source electrode of the 11st transistor M11, the other end and described second
The source electrode of 11 transistor M21 is connected.
The second transistor M2, the third transistor M3, the 4th transistor M4, the 9th transistor M9,
The tenth transistor M10, the tenth two-transistor M12, the 13rd transistor M13, the 14th transistor
M14, the 19th transistor M19, the 20th transistor M20 are PMOS tube；
The 5th transistor M5, the 6th transistor M6, the 7th transistor M7, the 8th transistor M8,
The 11st transistor M11, the 15th transistor M15, the 16th transistor M16, the 17th transistor
M17, the 18th transistor M18, the 21st transistor M21 are NMOS tube.
It further includes the second capacitor C2, one end of the second capacitor C2 and institute that the Switching Power Supply output frequency, which adjusts circuit,
The drain electrode for stating the 8th transistor M8 is connected, and the other end is connected with the drain electrode of the 18th transistor M18.
Switching Power Supply output frequency of the invention adjusts circuit, and the specific working principle is as follows:
Switch power supply system can maintain the output voltage of setting under the control of the control circuit, substantially former according to control theory
Reason, for limited Isobarically Control loop gain, is deposited 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 with Isobarically Control loop gain.Work as switch power supply system
When load reduction, switch power supply output current is reduced, and Isobarically Control loop gain increases, and output voltage error amplitude reduces, and is opened
Powered-down source actual output voltage increases.It therefore can be by detection switch power supply actual output voltage, to judge that Switching Power Supply is defeated
Electric current out.Since switch power source output voltage error is smaller, amplifying circuit is needed to amplify it.
In switch power supply system, when inductance is to load discharge, switch power source output voltage can pass through induction coil
The feedback voltage V FB of fixed proportion is generated, detection module 101 receives feedback voltage V FB, controlling of sampling pulse signal VSW's
Feedback voltage V FB is sampled under control, the first transistor M1 is used as sampling switch, when inductance is to load discharge, sampling
Control wave controls the first transistor M1 conducting, and switch power source output voltage information is stored on first capacitor C1, is obtained
To sampled voltage VFBS.
First reference voltage VR1 represents the target output voltage of Switching Power Supply setting, the difference with sampled voltage VFBS
Value just reflects switch power source output voltage error.Amplifier AMP and first resistor R1, second resistance R2 composition amplification electricity
Road amplifies the difference of the first reference voltage VR1 and sampled voltage VFBS, generates error-detecting amplified signal Verr, with
Switch power supply output current variation.
Adjustment module 102 receives error-detecting amplified signal Verr, with the rising of error-detecting amplified signal Verr,
The frequency that a reduction is obtained on the basis of frequency control voltage VC1 adjusts voltage VC2, carrys out alternative frequency control voltage VC1 and uses
Make setting energy storage inductor charging peaks, to improve the switching frequency of power switch.
Third transistor M3 and the 4th transistor M4 constitutes differential pair transconductance, by error-detecting amplified signal Verr and second
The difference of reference voltage VR2 is converted into difference current at 3rd resistor R3, the 4th both ends resistance R4, is arrived by the 5th transistor M5
Difference current is output to the 6th resistance R6 by the mirror image of the tenth transistor M10 current mirror.The pressure drop at the 6th both ends resistance R6 is
(Verr-VR2) * K1*K2, wherein K1 is the ratio R6/ (R3+R4) of resistance value, and K2 is the ratio of current mirror.
Tenth two-transistor to the 20th transistor constitutes voltage follower, receives frequency control voltage VC1, obtains amplitude
It is identical to follow voltage Vbuf, driving current is provided for the 6th resistance R6.Therefore have
(VC1-VC2)=(Verr-VR2) * K1*K2
By suitably adjusting two coefficients of the second reference voltage VR2 and K1, K2, adjustable frequency adjusts voltage
VC2 with error-detecting amplified signal Verr variation relation, to realize that the switching frequency of power switch follows Switching Power Supply defeated
Curent change out.
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, to guarantee the power switch when switch power supply output current is larger
Switching frequency will not be reduced infinitely.
The electric current of 8th transistor M8 generates a minimum voltage on the 5th resistance R5, to guarantee defeated in Switching Power Supply
Electric current will not be increased infinitely compared with the switching frequency that one-hour rating switchs out.
Second capacitor C2 is used as the circuit of burning voltage follower, while being used as the output that stable frequency adjusts voltage VC2.
By the above technological means, Switching Power Supply output frequency of the invention adjusts circuit, detection switch power-supply system
Output voltage, judges the decline degree of the output electric current of switch power supply system, and then generates a lower frequency and adjust voltage
Alternative frequency controls voltage to set energy storage inductor charging peaks, improves the switching frequency of power switch, and final realize eliminates sound
Frequency noise improves system effectiveness and lifting system response speed.
The present invention has been described in detail with reference to the accompanying drawings, those of ordinary skill in the art can be according to above-mentioned
Illustrate to make many variations to the present invention.Thus, certain details in embodiment should not constitute limitation of the invention, the present invention
It will be using the range that the appended claims define as protection scope of the present invention.
Although specific embodiments of the present invention have been described above, 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
Under the premise of from the principle and substance of the present invention, many changes and modifications may be made, but these are changed
Protection scope of the present invention is each fallen with modification.
Claims (7)
1. a kind of Switching Power Supply output frequency adjusts circuit, which is characterized in that including detection module and adjustment module, Switching Power Supply
Input power charged by a power switch to an energy storage inductor；
The first input end of the detection module receives a feedback voltage, the voltage value and switch power supply system of the feedback voltage
Output voltage is at fixed proportion；Second input terminal of the detection module receives a controlling of sampling pulse signal, the sampling control
Pulse signal processed is identical as the switching frequency of the power switch；The third input terminal of the detection module receives one first reference
The output end of voltage, the detection module exports an error-detecting amplified signal；
The first input end of the adjustment module receives the error-detecting amplified signal, the second input terminal of the adjustment module
One second reference voltage is received, the third input terminal of the adjustment module receives a frequency control voltage, the adjustment module
Output end exports a frequency and adjusts voltage；
When the voltage of the error-detecting amplified signal is higher than second reference voltage, the frequency adjusts voltage and is lower than institute
Frequency control voltage is stated, when the voltage of the error-detecting amplified signal is not higher than second reference voltage, the frequency
It adjusts voltage and is equal to the frequency control voltage.
2. Switching Power Supply output frequency as described in claim 1 adjusts circuit, which is characterized in that when the error-detecting is amplified
When the voltage of signal is higher than second reference voltage, the frequency control voltage and the frequency adjust the difference between voltage
It is in a fixed proportion between the voltage of the error-detecting amplified signal and the difference of second reference voltage.
3. Switching Power Supply output frequency as described in claim 1 adjusts circuit, which is characterized in that the detection module includes the
One transistor, first capacitor, amplifier, first resistor, second resistance；
The source electrode of the first transistor receives the feedback voltage and is sampled, and drain electrode connects the one of the first capacitor
End, to obtain sampled voltage, grid receives the controlling of sampling pulse signal；
The other end of the first capacitor is grounded；
The non-inverting input terminal of the amplifier receives the sampled voltage, and inverting input terminal connects the one of the first resistor simultaneously
The one end at end and the second resistance, output end is connected with the other end of the second resistance, and exports the error-detecting and put
Big signal；
The other end of the first resistor receives first reference voltage.
4. Switching Power Supply output frequency as claimed in claim 3 adjusts circuit, which is characterized in that the first transistor is
PMOS tube.
5. Switching Power Supply output frequency as described in claim 1 adjusts circuit, which is characterized in that the 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；
The Switching Power Supply output frequency adjusts circuit and is powered by a power supply, and the source electrode of the second transistor meets institute
State power supply, grid receives the bias voltage of an outside, drains while connecting one end and described the of the 3rd resistor
One end of four resistance；
The source electrode of the third transistor is connected with the other end of the 3rd resistor, and grid receives the error-detecting amplification letter
Number, drain electrode is connected with the drain and gate of the 5th transistor；
The source electrode of 4th transistor is connected with the other end of the 4th resistance, and grid receives second reference voltage,
Drain electrode is connected with the drain and gate of the 6th transistor；
The source electrode of 5th transistor is grounded；
The source electrode of 6th transistor is grounded；
The source electrode of 7th transistor is grounded, and grid is connected with the grid of the 5th transistor, and drain electrode is brilliant with the described 9th
The drain and gate of body pipe is connected；
The source electrode of 8th transistor is grounded, and grid is connected with the grid of the 6th transistor, drain electrode and the 5th electricity
One end of resistance is connected；
The source electrode of 9th transistor connects the power supply；
The source electrode of tenth transistor connects the power supply, and grid is connected with the grid of the 9th transistor, drain electrode with
The drain electrode of 11st transistor is connected；
The grid of 11st transistor is connected with the grid of the 21st transistor and drain electrode, source electrode and the described 5th
The other end of resistance is connected, and exports the frequency and adjusts voltage；
The source electrode of tenth two-transistor connects the power supply, and grid receives the bias voltage, drains while connecting institute
State the source electrode of the 13rd transistor and the source electrode of the 14th transistor；
The grid of 13rd transistor receives the frequency control voltage, the drain electrode of drain electrode and the 15th transistor and
Grid is connected；
The grid of 14th transistor is connected with the source electrode of the 21st transistor, drain electrode and the 16th crystal
The drain and gate of pipe is connected；
The source electrode of 15th transistor is grounded；
The source electrode of 16th transistor is grounded；
The source electrode of 17th transistor is grounded, and grid is connected with the grid of the 16th transistor, is drained and described the
The grid of 19 transistors is connected with drain electrode；
The source electrode of 18th transistor is grounded, and grid is connected with the grid of the 15th transistor, is drained and described the
The source electrode of 21 transistors is connected, and generates one and follows voltage；
The source electrode of 19th transistor connects the power supply；
The source electrode of 20th transistor connects the power supply, and grid is connected with the grid of the 19th transistor, leakage
Pole is connected with the drain electrode of the 21st transistor；
One end of 6th resistance is connected with the source electrode of the 11st transistor, the other end and the 21st transistor
Source electrode be connected.
6. Switching Power Supply output frequency as claimed in claim 5 adjusts circuit, which is characterized in that the second transistor, institute
State third transistor, the 4th transistor, the 9th transistor, the tenth transistor, the tenth two-transistor, institute
Stating the 13rd transistor, the 14th transistor, the 19th transistor, the 20th transistor is PMOS tube；
5th transistor, the 6th transistor, the 7th transistor, the 8th transistor, the 11st crystalline substance
It is body pipe, the 15th transistor, the 16th transistor, the 17th transistor, the 18th transistor, described
21st transistor is NMOS tube.
7. Switching Power Supply output frequency as claimed in claim 5 adjusts circuit, which is characterized in that the Switching Power Supply output frequency
It further includes the second capacitor that rate, which adjusts circuit, and one end of second capacitor is connected with the drain electrode of the 8th transistor, another
End is connected with the drain electrode of the 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 |
|---|---|---|---|
| CN201610980091.9A CN106374742B (en) | 2016-11-08 | 2016-11-08 | Switching Power Supply output frequency adjusts circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106374742A CN106374742A (en) | 2017-02-01 |
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| CN201610980091.9A Active CN106374742B (en) | 2016-11-08 | 2016-11-08 | Switching Power Supply output frequency adjusts circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114124004B (en) * | 2021-11-23 | 2024-06-21 | 上海天马微电子有限公司 | Signal processing circuit and signal processing device |
| CN116073656B (en) * | 2023-02-17 | 2024-04-09 | 无锡麟聚半导体科技有限公司 | Current regulating circuit and chip |
| CN117294142B (en) * | 2023-11-24 | 2024-02-06 | 上海英联电子科技有限公司 | Voltage conversion circuit |
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| CN1975622A (en) * | 2004-08-30 | 2007-06-06 | 美国芯源系统股份有限公司 | Pulse frequency modulation methods and circuits |
| CN202168002U (en) * | 2011-08-11 | 2012-03-14 | 上海新进半导体制造有限公司 | Primary-side control type power switch and alternating current-direct current converter |
| CN103532352A (en) * | 2013-10-25 | 2014-01-22 | 常熟英特电子科技有限公司 | Control circuit and control method used for eliminating light-load audio noise of switch power supply |
| CN203827178U (en) * | 2014-04-28 | 2014-09-10 | 贾增元 | Switching power supply device |
| CN204835923U (en) * | 2015-07-22 | 2015-12-02 | 无锡中星微电子有限公司 | PWMPFM control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7362191B2 (en) * | 2004-04-29 | 2008-04-22 | Linear Technology Corporation | Methods and circuits for frequency modulation that reduce the spectral noise of switching regulators |
| CN103078489B (en) * | 2011-10-25 | 2015-12-16 | 昂宝电子（上海）有限公司 | The system and method reducing electromagnetic interference is shaken for utilizing switching frequency |
| US9136763B2 (en) * | 2013-06-18 | 2015-09-15 | Intersil Americas LLC | Audio frequency deadband system and method for switch mode regulators operating in discontinuous conduction mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975622A (en) * | 2004-08-30 | 2007-06-06 | 美国芯源系统股份有限公司 | Pulse frequency modulation methods and circuits |
| CN202168002U (en) * | 2011-08-11 | 2012-03-14 | 上海新进半导体制造有限公司 | Primary-side control type power switch and alternating current-direct current converter |
| CN103532352A (en) * | 2013-10-25 | 2014-01-22 | 常熟英特电子科技有限公司 | Control circuit and control method used for eliminating light-load audio noise of switch power supply |
| CN203827178U (en) * | 2014-04-28 | 2014-09-10 | 贾增元 | Switching power supply device |
| CN204835923U (en) * | 2015-07-22 | 2015-12-02 | 无锡中星微电子有限公司 | PWMPFM control circuit |
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