CN109510479B - A kind of feed circuit for Switching Power Supply - Google Patents
A kind of feed circuit for Switching Power Supply Download PDFInfo
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- CN109510479B CN109510479B CN201811542589.2A CN201811542589A CN109510479B CN 109510479 B CN109510479 B CN 109510479B CN 201811542589 A CN201811542589 A CN 201811542589A CN 109510479 B CN109510479 B CN 109510479B
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of feed circuits for Switching Power Supply, including the first feedback branch (100), the second feedback branch (200), third feedback branch (300), PID to adjust circuit (07), isolation circuit (08)；Feed circuit for Switching Power Supply of the invention has the features such as circuit is simple, at low cost, it can be according to the different application of output, the adjusting of the progress voltage of segmented, it is programmed without MCU, reduce the complexity of system, the features such as lifting system is stablized has good practical significance in some special applications.
Description
Technical field
The present invention relates to electronic technology fields, and in particular to a kind of feed circuit for Switching Power Supply.
Background technique
Switching Power Supply due to it is small in size, light-weight and high-efficient the advantages that, have been more and more widely used.Major part is opened
Powered-down source is using light-coupled isolation mode: feeding back output voltage error signal isolation to primary side by the linear work area of optocoupler
Controller carries out pulse width modulation, and then realizes whole power supply pressure stabilizing control.Pressure regulation used in Switching Power Supply at present is all
Using linear voltage regulating mode, can only be in dull linear relationship, and some occasion required voltages belong to it is nonlinear,
What some systems needed.Existing non-linear voltage regulating mode is the mode of the MCU control used to realize this purpose, however is adopted
It is to need to program with the mode that MCU is controlled, on the one hand increases the complexity of system, on the other hand increasing MCU also will increase cost.
Summary of the invention
It is an object of the invention to overcome prior art problem, solve to need in special application with duty ratio tune
Pressure and the mode of pressure regulation are the occasion of piecewise function, propose a kind of feed circuit for Switching Power Supply, the progress electricity of segmented
The adjusting of pressure, specific implementation technical solution are as follows:
A kind of feed circuit for Switching Power Supply, including the first feedback branch 100, the second feedback branch 200, third are anti-
Present branch 300, PID adjusts circuit 07, isolation circuit 08；
The input terminal of first feedback branch 100, the second feedback branch 200 input terminal be respectively connected to a PWM letter
Number (PWM_DA), the input terminal of the third feedback branch 300 are connected to the output end vo of Switching Power Supply；The pwm signal is
Rectangular wave, pulse frequency duty ratio are D, wherein 0 < D < 100%；
The output end of first feedback branch 100, the output end of the second feedback branch 200, third feedback branch 300
Output end is respectively connected to the input terminal that PID adjusts circuit 07, and the output end that the PID adjusts circuit 07 is connected to the isolation
The input terminal of circuit 08, feedback output end of the output end FB of the isolation circuit 08 as feed circuit；
First feedback branch 100 includes sequentially connected first filter circuit 01, comparison circuit 03；
First filter circuit 01 is RC filter circuit, for being converted to the filtering processing of pwm signal alternating-current pulse wave
D. c. voltage signal；
The comparison circuit 03 includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, third fortune
Calculate amplifier U3；
Input terminal of the one end of the 5th resistance R5 as the comparison circuit 03, the other end of the 5th resistance R5
It is connected to the negative input end 6 of the third operational amplifier U3, one end of the 3rd resistor R3 is connected to a DC voltage, institute
State 3rd resistor R3 the other end be respectively connected to one end of the 4th resistance R4, the third operational amplifier U3 it is just defeated
Enter end 5, the other end ground connection of the 4th resistance R4, one end of the 6th resistance R6 is connected to the third operational amplifier
The positive input terminal 5 of U3, the other end of the 6th resistance R6 is connected to the output end 7 of the third operational amplifier U3, described
Output end of the output end 7 of third operational amplifier U3 as first feedback branch 100；
Second feedback branch 200 includes sequentially connected second filter circuit 04, and second filter circuit 04 is
RC filter circuit, for the filtering processing of pwm signal alternating-current pulse wave to be converted to d. c. voltage signal；
The third feedback branch 300 is output sample circuit for carrying out sampling acquisition to the output voltage of Switching Power Supply
Voltage feedback signal；The third feedback branch 300 is the tenth resistance R10, and one end of the tenth resistance R10 is connected to switch
The output end vo of power supply, the other end of the tenth resistance R10 are connected to the input terminal that the PID adjusts circuit 07；
The PID adjusts circuit 07 and is used for first feedback branch 100, second feedback branch 200 or described
The voltage signal of the output of third feedback branch 300 carries out PID adjusting；
The isolation circuit 08 is used to carry out being isolated by way of photoelectric coupling by the signal that PID adjusts circuit 07 defeated
Out；Further, in embodiments of the present invention, it is preferable that the isolation circuit 08 includes the 15th resistance R15, the 16th electricity
R16, photoelectrical coupler U5 are hindered, the luminescent device anode of the photoelectrical coupler U5 is connected to the one of the 15th resistance R15
End, the other end of the 15th resistance R15 are connected to the output end vo of Switching Power Supply；The photophore of the photoelectrical coupler U5
Part cathode is connected to the output end SA that the PID adjusts circuit 07, the emitter of the light receiving element of the photoelectrical coupler U5
Power ground is connect, the collector of the light receiving element of the photoelectrical coupler U5 is connected to one end of the 16th resistance R16, institute
State output end of the other end of the 16th resistance R16 as the isolation circuit 08.
In embodiments of the present invention, further, optionally, the output sample circuit further include eleventh resistor R11,
One end of 5th capacitor C5, the eleventh resistor R11 are connected to the output end vo of Switching Power Supply, the eleventh resistor R11
The other end be connected to one end of the 5th capacitor C5, the other end of the 5th capacitor C5 is connected to the tenth resistance
The other end of R10.
Further, in embodiments of the present invention, it is preferable that first filter circuit 01 be include first resistor R1,
First capacitor C1, one end of the first resistor R1 are connected to the pwm signal (PWM_DA), and the first resistor R1's is another
End is connected to the one end the first capacitor C1, the first capacitor C1 other end ground connection, and the other end of the first resistor R1 is made
For the output end of first filter circuit 01；Second filter circuit 04 includes second resistance R2, the second capacitor C2, described
One end of second resistance R2 is connected to the pwm signal (PWM_DA), and the other end of the second resistance R2 is connected to described
Two one end capacitor C2, the second capacitor C2 other end ground connection；The other end of the second resistance R2 is as second filtering
The output end of circuit 04.
In embodiments of the present invention, further, optionally, first feedback branch 100 further includes the first buffering electricity
Road 02, the positive input terminal that first buffer circuit 02 is the first operational amplifier U1, the first operational amplifier U1 connect
To the output end of first filter circuit 1；The negative input end of the first operational amplifier U1 is connected to first operation
The output end of amplifier U1.
In embodiments of the present invention, further, optionally, second feedback branch 200 further includes the second buffering electricity
Road 05, second buffer circuit 05 are that the positive input terminal of second operational amplifier U2 described in second operational amplifier U2 is connected to
The output end of second filter circuit 04；The negative input end of the second operational amplifier U2 is connected to second operation and puts
The output end of big device U2.
In embodiments of the present invention, further, optionally, first feedback branch 100 further includes diode D1,
Seven resistance R7, the anode of the diode D1 are connected to the output end of the comparison circuit 03；The cathode of the diode D1 connects
It is connected to one end of the 7th resistance R7, output of the other end of the 7th resistance R7 as first feedback branch 100
End.
In embodiments of the present invention, further, optionally, second feedback branch 200 further includes third filtered electrical
Road, the third filter circuit be RC filter circuit, be RC filter circuit, the third filter circuit include the 8th resistance R8,
One end of 4th capacitor C4, the 8th resistance R8 are connected to the output end of second buffer circuit 05, the 8th resistance
The other end of R8 is connected to the one end the 4th capacitor C4；The 4th capacitor C4 other end ground connection.
Further, optionally, the comparison circuit 03 further includes third capacitor C3, and one end of the third capacitor C3 connects
It is connected to the positive input terminal 5 of the third operational amplifier U3, the other end ground connection of the third capacitor C3.
Further, in embodiments of the present invention, it is preferable that the PID adjust circuit 07 include twelfth resistor R12,
Thirteenth resistor R13, the 14th resistance R14, four-operational amplifier U4, the 7th capacitor C7, the four-operational amplifier U4
Positive input terminal 3 connect and be connected to DC voltage V1 after the thirteenth resistor R13, one end point of the twelfth resistor R12
It is not connected to the negative input end 2 of the four-operational amplifier U4, one end of the 14th resistance R14, the twelfth resistor R12
The other end ground connection；The other end of the 14th resistance R14 is connected to one end of the 7th capacitor C7, the 7th capacitor
The other end of C7 is connected to the output end 1 of the four-operational amplifier U4, and the output end 1 of the four-operational amplifier U4 is made
The output end SA of circuit 07 is adjusted for the PID.
In embodiments of the present invention, further, optionally, it further includes the 8th capacitor C8 that the PID, which adjusts circuit 07,；Institute
The one end for stating the 8th capacitor C8 is connected to the negative input end 2 of the four-operational amplifier U4, and the 8th capacitor C8's is another
End is connected to the output end 1 of the four-operational amplifier U4.
A kind of feed circuit for Switching Power Supply provided by the invention, has the features such as circuit is simple, at low cost, it can
According to the different application of output, the adjusting of the progress voltage of segmented programs without MCU, reduces the complexity of system, promoted
The features such as system is stablized has good practical significance in some special applications.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand invention, constitutes a part of the invention, the present invention
Illustrative embodiments and their description be used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the feed circuit schematic illustration for Switching Power Supply of the invention；
Fig. 2 is the circuit diagram of the comparison circuit of the feed circuit for Switching Power Supply of the invention；
Fig. 3 is the circuit diagram of the third feedback branch of the feed circuit for Switching Power Supply of the invention；
Fig. 4 is the circuit diagram of the first feedback branch of the feed circuit for Switching Power Supply of the invention；
Fig. 5 is another feed circuit schematic illustration for Switching Power Supply of the invention；
Fig. 6 is the circuit diagram of the second feedback branch of the feed circuit for Switching Power Supply of the invention；
Fig. 7 is another circuit diagram of the first feedback branch of feed circuit for Switching Power Supply of the invention；
Fig. 8 is the circuit diagram that the feed circuit PID for Switching Power Supply of the invention adjusts circuit；
Fig. 9 is the circuit diagram of the feed circuit isolation circuit for Switching Power Supply of the invention.
Specific embodiment
In order to be clearer and more clear technical problems, technical solutions and advantages to be solved, tie below
Drawings and examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
The present invention provides a kind of feed circuit for Switching Power Supply is as shown in Fig. 1, including the first feedback branch
100, the second feedback branch 200, third feedback branch 300, PID adjust circuit 07, isolation circuit 08；
The input terminal of first feedback branch 100, the second feedback branch 200 input terminal be respectively connected to the PWM
The input terminal of signal (PWM_DA), the third feedback branch 300 is connected to the output end vo of Switching Power Supply；The pwm signal
For rectangular wave, pulse frequency duty ratio is D, wherein 0 < D < 100%；It is pwm signal 5V/ in example in the present invention
The square-wave signal of 50KHZ；
The output end of first feedback branch 100, the output end of the second feedback branch 200, third feedback branch 300
Output end is respectively connected to the input terminal that PID adjusts circuit 07, and the output end that the PID adjusts circuit 07 is connected to the isolation
The input terminal of circuit 08, feedback output end of the output end FB of the isolation circuit 08 as feed circuit；
First feedback branch 100 includes sequentially connected first filter circuit 01, comparison circuit 03；
First filter circuit 01 is RC filter circuit, for being converted to the filtering processing of pwm signal alternating-current pulse wave
D. c. voltage signal；
The comparison circuit 03 includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, third fortune
Amplifier U3 is calculated, as shown in Fig. 2；
Input terminal of the one end of the 5th resistance R5 as the comparison circuit 03, the other end of the 5th resistance R5
Be connected to the negative input end 6 of the third operational amplifier U3, one end of the 3rd resistor R3 be connected to a DC voltage+
5V, the other end of the 3rd resistor R3 are respectively connected to one end of the 4th resistance R4, the third operational amplifier U3
Positive input terminal 5, the 4th resistance R4 the other end ground connection, one end of the 6th resistance R6 is connected to the third operation
The positive input terminal 5 of amplifier U3, the other end of the 6th resistance R6 are connected to the output end of the third operational amplifier U3
7, output end of the output end 7 of the third operational amplifier U3 as first feedback branch 100；
Second feedback branch 200 includes sequentially connected second filter circuit 04, and second filter circuit 04 is
RC filter circuit, for the filtering processing of pwm signal alternating-current pulse wave to be converted to d. c. voltage signal；
The third feedback branch 300 is output sample circuit for carrying out sampling acquisition to the output voltage of Switching Power Supply
Voltage feedback signal, as shown in Fig. 3, the third feedback branch 300 be the tenth resistance R10, the one of the tenth resistance R10
End is connected to the output end vo of Switching Power Supply, and the other end of the tenth resistance R10 is connected to the PID and adjusts the defeated of circuit 07
Enter end.Further, it is preferable to ground, the output sample circuit further includes eleventh resistor R11, the 5th capacitor C5, the described tenth
One end of one resistance R11 is connected to the output end vo of Switching Power Supply, and the other end of the eleventh resistor R11 is connected to described
The other end of one end of five capacitor C5, the 5th capacitor C5 is connected to the other end of the tenth resistance R10.
The PID adjusts circuit 07 and is used for first feedback branch 100, second feedback branch 200 or described
The voltage signal of the output of third feedback branch 300 carries out PID adjusting；The isolation circuit 08 is used to PID adjusting circuit 07
Signal isolation output is carried out by way of photoelectric coupling.
Optionally, as shown in Fig. 4, first filter circuit 01 be include first resistor R1, first capacitor C1, it is described
One end of first resistor R1 is connected to pwm signal (PWM_DA), and the other end of the first resistor R1 is connected to first electricity
Hold the one end C1, the first capacitor C1 other end ground connection, the other end of the first resistor R1 is as first filter circuit
01 output end.
Further, in an alternative embodiment of the invention, in order to which the input impedance for improving first feedback branch 100 is dropped
Low output impedance, it is preferable that as shown in attached drawing 4,5, first feedback branch 100 further includes the first buffer circuit 02, described
First buffer circuit 02 is the first operational amplifier U1, and the positive input terminal of the first operational amplifier U1 is connected to described first
The output end of filter circuit 1；The negative input end of the first operational amplifier U1 is connected to the first operational amplifier U1's
Output end.
As shown in Fig. 6, second filter circuit 04 includes second resistance R2, the second capacitor C2, the second resistance
One end of R2 is connected to pwm signal (PWM_DA), and the other end of the second resistance R2 is connected to described one end second capacitor C2,
The second capacitor C2 other end ground connection；Output of the other end of the second resistance R2 as second filter circuit 04
End.
Further, as shown in attached drawing 5,6, output impedance is reduced in order to improve the input impedance of the second feedback branch 200,
Second feedback branch 200 further includes the second buffer circuit 05, and second buffer circuit 05 is second operational amplifier U2
The positive input terminal of the second operational amplifier U2 is connected to the output end of second filter circuit 04；Second operation is put
The negative input end of big device U2 is connected to the output end of the second operational amplifier U2.
Further, it is preferable that second feedback branch 200 further includes third filter circuit, the third filtered electrical
Road is RC filter circuit, is RC filter circuit, and the third filter circuit includes the 8th resistance R8, the 4th capacitor C4, described the
One end of eight resistance R8 is connected to the output end of second buffer circuit 05, and the other end of the 8th resistance R8 is connected to institute
State the 4th one end capacitor C4；The 4th capacitor C4 other end ground connection.Second feedback branch 200 further includes the 9th resistance
One end of R9, the 9th resistance R9 are connected to the other end of the 8th resistance R8, and the other end of the 9th resistance R9 is made
For the output end of second feedback branch 200.
Further, as shown in Fig. 7, it is preferable that first feedback branch 100 further includes diode D1, the 7th electricity
R7 is hindered, the anode of the diode D1 is connected to the output end of the comparison circuit 03；The cathode of the diode D1 is connected to
One end of the 7th resistance R7, output end of the other end of the 7th resistance R7 as first feedback branch 100.Into
One step, the comparison circuit 03 further includes third capacitor C3, and one end of the third capacitor C3 is connected to the third operation
The positive input terminal 5 of amplifier U3, the other end ground connection of the third capacitor C3.
As shown in Fig. 8, it includes twelfth resistor R12, thirteenth resistor R13, the 14th electricity that the PID, which adjusts circuit 07,
R14, four-operational amplifier U4, the 7th capacitor C7 are hindered, the positive input terminal 3 of the four-operational amplifier U4 connects the described tenth
DC voltage V1 is connected to after three resistance R13, the DC voltage V1 can may be Switching Power Supply for+5V DC voltage
Output end voltage Vo, one end of the twelfth resistor R12 are respectively connected to the negative input end of the four-operational amplifier U4
2, one end of the 14th resistance R14, the other end ground connection of the twelfth resistor R12；The other end of the 14th resistance R14
It is connected to one end of the 7th capacitor C7, the other end of the 7th capacitor C7 is connected to the four-operational amplifier U4's
Output end 1, the output end 1 of the four-operational amplifier U4 adjust the output end SA of circuit 07 as the PID.
Further, it further includes the 8th capacitor C8 that the PID, which adjusts circuit 07,；One end of the 8th capacitor C8 is connected to
The other end of the negative input end 2 of the four-operational amplifier U4, the 8th capacitor C8 is connected to the 4th operation amplifier
The output end 1 of device U4.
As shown in Fig. 9, the isolation circuit 08 includes the 15th resistance R15, the 16th resistance R16, photoelectrical coupler
U5, the luminescent device anode of the photoelectrical coupler U5 are connected to one end of the 15th resistance R15, the 15th resistance
The other end of R15 is connected to the output end vo of Switching Power Supply；The luminescent device cathode of the photoelectrical coupler U5 is connected to described
PID adjusts the output end SA of circuit 07, and the emitter of the light receiving element of the photoelectrical coupler U5 connects power ground, the photoelectricity
The collector of the light receiving element of coupler U5 is connected to one end of the 16th resistance R16, the 16th resistance R16's
Output end of the other end as the isolation circuit 08.
The working principle of feed circuit for Switching Power Supply of the invention is as follows:
Wherein, PWM_DA is the square-wave signal of 5V/50KHZ, R4/ (R3+R4)=0.116, voltage 5V*0.116V.
PWM_DA is the square-wave signal of a 5V/50KHZ, changes the 4th operation by the duty ratio of this rectangular wave
The voltage of 2 feet of amplifier U4, so that output voltage is adjusted, so that output voltage, according to as follows:
When PWM_DA is the signal of duty ratio 0 < D < 10%, second operational amplifier U2 and the first operational amplifier at this time
The output of U1 is all the voltage between a 0-0.5V, using the partial pressure of the 4th resistance R4 and 3rd resistor R3 so that third operation
The partial pressure of 5 feet of amplifier U3 is 0.58V, and the 7 feet output of third operational amplifier U3 is 5V at this time, then the electricity of 5V and the 6th
The go back voltage of 5 feet of third operational amplifier U3 of resistance R6 inverse is 0.62V, that is, 6 feet of third operational amplifier U3
Voltage will reach 0.62V just can reversal voltage.
When PWM_DA is the signal of duty ratio 10% < D < 20%, second operational amplifier U2 and the first operation are put at this time
The output of big device U1 is the voltage between 0.5-1V, if duty ratio greater than 13%, then 5 feet of third operational amplifier U3
Voltage just will become 0.576V, the 6 foot voltages of third operational amplifier U3 will be more than 0.62V, will reversal voltage, third
7 feet of operational amplifier U3 export 0V, and the first feedback branch 100 is equivalent to disconnection, and the second feedback branch 200 participates in voltage tune
Section.
When PWM_DA is the signal of duty ratio 20% < D < 100%, second operational amplifier U2 and the first operation are put at this time
The output of big device U1 is the voltage between 1-5V, and the first feedback branch 100 is equivalent to disconnection, and the second feedback branch 200 participates in
Voltage is adjusted.
In the present invention, it is preferred to which the first operational amplifier U1 is LM358 chip, second operational amplifier U2 is
AP4310 chip, third operational amplifier U3 are LM358 chip, and four-operational amplifier U4 is AP4310 chip.
The embodiment of the present invention, it is preferable that feed circuit of the present invention for Switching Power Supply can be applied to LLC resonance circuit
Switching Power Supply, the output end FB of the feed circuit for Switching Power Supply of the invention are connected to the control chip electricity of Switching Power Supply
Road adjusts control for segmented voltage, it should be noted that feed circuit of the invention is not limited to LLC resonance circuit, can
Think other switching power circuits.
Description above describe the preferred embodiment of the present invention, it is to be understood that the present invention is not limited to above-mentioned implementation
Example, and excluding other embodiments should not be regarded as.Enlightenment through the invention, those skilled in the art combine known or existing
The change that technology, knowledge are carried out also should be regarded as within the scope of the present invention.
Claims (10)
1. a kind of feed circuit for Switching Power Supply, which is characterized in that
Circuit is adjusted including the first feedback branch (100), the second feedback branch (200), third feedback branch (300), PID
(07), isolation circuit (08)；
The input terminal of first feedback branch (100), the input terminal of the second feedback branch (200) are respectively connected to PWM letter
Number (PWM_DA), the input terminal of the third feedback branch (300) are connected to the output end (Vo) of Switching Power Supply；The PWM letter
Number be rectangular wave, pulse frequency duty ratio be D, wherein 0 < D < 100%；
The output end of first feedback branch (100), the output end of the second feedback branch (200), third feedback branch (300)
Output end be respectively connected to the input terminal that PID adjusts circuit (07), the output end that the PID adjusts circuit (07) is connected to institute
State the input terminal of isolation circuit (08), feedback output end of the output end (FB) of the isolation circuit (08) as feed circuit；
First feedback branch (100) includes sequentially connected first filter circuit (01), comparison circuit (03)；
First filter circuit (01) is RC filter circuit, straight for being converted to the filtering processing of pwm signal alternating-current pulse wave
Flow voltage signal；
The comparison circuit (03) include 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6),
Third operational amplifier (U3)；
Input terminal of the one end of 5th resistance (R5) as the comparison circuit (03), the 5th resistance (R5) it is another
End is connected to the negative input end (6) of the third operational amplifier (U3), and one end of the 3rd resistor (R3) is connected to always
The other end of galvanic electricity pressure, the 3rd resistor (R3) is respectively connected to one end of the 4th resistance (R4), the third operation
The positive input terminal (5) of amplifier (U3), the other end ground connection of the 4th resistance (R4), one end of the 6th resistance (R6) connects
It is connected to the positive input terminal (5) of the third operational amplifier (U3), the other end of the 6th resistance (R6) is connected to described
The output end (7) of three operational amplifiers (U3), the output end (7) of the third operational amplifier (U3) is as first feedback
The output end of branch (100)；
Second feedback branch (200) includes the second filter circuit (04), and second filter circuit (04) is RC filtered electrical
Road, for the filtering processing of pwm signal alternating-current pulse wave to be converted to d. c. voltage signal；
The third feedback branch (300) is output sample circuit, carries out sampling acquisition for the output voltage to Switching Power Supply
Voltage feedback signal；The third feedback branch (300) is the tenth resistance (R10), and one end of the tenth resistance (R10) connects
To the output end (Vo) of Switching Power Supply, the other end of the tenth resistance (R10) is connected to the PID and adjusts the defeated of circuit (07)
Enter end；
The PID adjusts circuit (07) and is used for first feedback branch (100), second feedback branch (200) or institute
The voltage signal for stating the output of third feedback branch (300) carries out PID adjusting；
The isolation circuit (08) is used to carry out being isolated by way of photoelectric coupling by the signal that PID adjusts circuit (07) defeated
Out；
The isolation circuit (08) includes the 15th resistance (R15), the 16th resistance (R16), photoelectrical coupler (U5), the light
The luminescent device anode of electric coupler (U5) is connected to one end of the 15th resistance (R15), the 15th resistance (R15)
The other end be connected to the output end (Vo) of Switching Power Supply；The luminescent device cathode of the photoelectrical coupler (U5) is connected to described
PID adjusts the output end (SA) of circuit (07), and the emitter of the light receiving element of the photoelectrical coupler (U5) connects power ground, institute
The collector for stating the light receiving element of photoelectrical coupler (U5) is connected to one end of the 16th resistance (R16), and the described tenth
Output end of the other end of six resistance (R16) as the isolation circuit (08).
2. the feed circuit according to claim 1 for Switching Power Supply, which is characterized in that
The output sample circuit further includes eleventh resistor (R11), the 5th capacitor (C5), the eleventh resistor (R11)
One end is connected to the output end (Vo) of Switching Power Supply, and the other end of the eleventh resistor (R11) is connected to the 5th capacitor
(C5) other end of one end, the 5th capacitor (C5) is connected to the other end of the tenth resistance (R10).
3. the feed circuit according to claim 1 for Switching Power Supply, which is characterized in that
First filter circuit (01) be include first resistor (R1), first capacitor (C1), the one of the first resistor (R1)
End is connected to the pwm signal (PWM_DA), and the other end of the first resistor (R1) is connected to the first capacitor (C1) one
End, first capacitor (C1) other end ground connection, the other end of the first resistor (R1) is as first filter circuit
(01) output end；
Second filter circuit (04) includes second resistance (R2), the second capacitor (C2), one end of the second resistance (R2)
It being connected to the pwm signal (PWM_DA), the other end of the second resistance (R2) is connected to described second capacitor (C2) one end,
Second capacitor (C2) other end ground connection；The other end of the second resistance (R2) is as second filter circuit (04)
Output end.
4. the feed circuit according to claim 1 for Switching Power Supply, which is characterized in that
First feedback branch (100) further includes the first buffer circuit (02), and first buffer circuit (02) is the first fortune
It calculates amplifier (U1), the positive input terminal of first operational amplifier (U1) is connected to the output of first filter circuit (1)
End；The negative input end of first operational amplifier (U1) is connected to the output end of first operational amplifier (U1)；It is described
The output end of first operational amplifier (U1) is connected to the input terminal of the comparison circuit.
5. the feed circuit according to claim 4 for Switching Power Supply, which is characterized in that
First feedback branch (100) further includes diode (D1), the 7th resistance (R7), and the anode of the diode (D1) connects
It is connected to the output end of the comparison circuit (03)；The cathode of the diode (D1) is connected to the one of the 7th resistance (R7)
End, output end of the other end of the 7th resistance (R7) as first feedback branch (100).
6. the feed circuit according to claim 1 for Switching Power Supply, which is characterized in that
Second feedback branch (200) further includes the second buffer circuit (05), and second buffer circuit (05) is the second fortune
It calculates amplifier (U2), the positive input terminal of the second operational amplifier (U2) is connected to the output of second filter circuit (04)
End；The negative input end of the second operational amplifier (U2) is connected to the output end of the second operational amplifier (U2).
7. the feed circuit according to claim 6 for Switching Power Supply, it is characterised in that
Second feedback branch (200) further includes third filter circuit, and the third filter circuit is RC filter circuit, described
Third filter circuit includes the 8th resistance (R8), the 4th capacitor (C4), and one end of the 8th resistance (R8) is connected to described the
The output end of two buffer circuits (05), the other end of the 8th resistance (R8) are connected to described 4th capacitor (C4) one end；Institute
State the 4th capacitor (C4) other end ground connection.
8. the feed circuit according to claim 1 for Switching Power Supply, which is characterized in that
The comparison circuit (03) further includes third capacitor (C3), and one end of the third capacitor (C3) is connected to the third fortune
Calculate the positive input terminal (5) of amplifier (U3), the other end ground connection of the third capacitor (C3).
9. the feed circuit according to claim 1 for Switching Power Supply, which is characterized in that
It includes twelfth resistor (R12), thirteenth resistor (R13), the 14th resistance (R14), that the PID, which adjusts circuit (07),
Four-operational amplifier (U4), the 7th capacitor (C7), positive input terminal (3) connection the described tenth of the four-operational amplifier (U4)
It is connected to after three resistance (R13) DC voltage (V1), one end of the twelfth resistor (R12) is respectively connected to the 4th fortune
Calculate the negative input end (2) of amplifier (U4), one end of the 14th resistance (R14), another termination of the twelfth resistor (R12)
Ground；The other end of 14th resistance (R14) is connected to one end of the 7th capacitor (C7), the 7th capacitor (C7)
The other end is connected to the output end (1) of the four-operational amplifier (U4), the output end of the four-operational amplifier (U4)
(1) output end (SA) of circuit (07) is adjusted as the PID.
10. the feed circuit according to claim 9 for Switching Power Supply, which is characterized in that
It further includes the 8th capacitor (C8) that the PID, which adjusts circuit (07),；One end of 8th capacitor (C8) is connected to described
The negative input end (2) of four-operational amplifier (U4), the other end of the 8th capacitor (C8) are connected to the 4th operation amplifier
The output end (1) of device (U4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811542589.2A CN109510479B (en) | 2018-12-17 | 2018-12-17 | A kind of feed circuit for Switching Power Supply |
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| CN201811542589.2A CN109510479B (en) | 2018-12-17 | 2018-12-17 | A kind of feed circuit for Switching Power Supply |
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| CN109510479B true CN109510479B (en) | 2019-10-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201887664U (en) * | 2010-12-15 | 2011-06-29 | 北京新雷能科技股份有限公司 | Magnetic isolation feedback circuit of switch power supply |
| CN102983745A (en) * | 2012-12-12 | 2013-03-20 | 华为技术有限公司 | Voltage regulation method, pre-stabilized voltage power circuit and system |
| CN105871216A (en) * | 2016-06-23 | 2016-08-17 | 山东神戎电子股份有限公司 | Switch power supply circuit based on UC2843 |
| CN103997206B (en) * | 2014-05-20 | 2017-04-12 | 华为技术有限公司 | Switching power source |
-
2018
- 2018-12-17 CN CN201811542589.2A patent/CN109510479B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201887664U (en) * | 2010-12-15 | 2011-06-29 | 北京新雷能科技股份有限公司 | Magnetic isolation feedback circuit of switch power supply |
| CN102983745A (en) * | 2012-12-12 | 2013-03-20 | 华为技术有限公司 | Voltage regulation method, pre-stabilized voltage power circuit and system |
| CN103997206B (en) * | 2014-05-20 | 2017-04-12 | 华为技术有限公司 | Switching power source |
| CN105871216A (en) * | 2016-06-23 | 2016-08-17 | 山东神戎电子股份有限公司 | Switch power supply circuit based on UC2843 |
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| CN109510479A (en) | 2019-03-22 |
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Denomination of invention: A feedback circuit for switching power supply Effective date of registration: 20211115 Granted publication date: 20191011 Pledgee: Xiamen finance Company limited by guarantee Pledgor: XIAMEN CITY KELI ELECTRONICS Co.,Ltd. Registration number: Y2021990001094 |
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