CN108549450A - A kind of feedback circuit and feedback method of compensation line loss voltage - Google Patents
A kind of feedback circuit and feedback method of compensation line loss voltage Download PDFInfo
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- CN108549450A CN108549450A CN201810475293.7A CN201810475293A CN108549450A CN 108549450 A CN108549450 A CN 108549450A CN 201810475293 A CN201810475293 A CN 201810475293A CN 108549450 A CN108549450 A CN 108549450A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The invention discloses a kind of feedback circuits of compensation line loss voltage, include to compensate line loss voltage, this circuit caused by line loss resistance in power output circuit：Current detection module, the output current Io for detecting feedback circuit in real time by sampling resistor Rc；Outer voltage feedback module combines, output outer loop feedback voltage deviation Uob for introducing the line loss voltage Us being calculated according to line loss resistance Rs and output current Io is preset, and by the voltage feedback value Uop on line loss voltage Us, reference voltage V REF and load；Output current inner loop feedback module, the corresponding output voltage UIo of outer loop feedback voltage deviation Uob and output current for that will receive are combined, output inner loop feedback circuit voltage EAP signals to power supply chip.Desired value by improving output voltage compensates line loss voltage, keeps the voltage that Switching Power Supply output is connected on load end more accurate, while can limit the maximum value of output current, carries out short-circuit protection.
Description
Technical field
The present invention relates to field of switch power more particularly to a kind of feedback circuits and feedback method of compensation line loss voltage.
Background technology
Switching Power Supply is important electric power conversion apparatus, indispensable in all trades and professions.
Switching Power Supply is in use, needs the output positive and negative electrode of Switching Power Supply being connected to by external connection and connector
In power load equipment, since external connection has internal resistance, connector to have contact resistance, the loss generated when electric current flows through them is electric
Pressure is line loss voltage, and the voltage that line loss voltage causes power load equipment both ends is less than the voltage that Switching Power Supply exports, especially
It is exported in Switching Power Supply low-voltage, high-current, line loss voltage is relatively large, and the voltage at power load equipment both ends can be larger
Less than Switching Power Supply output voltage so that supply power load equipment actual power undertension, be easy to cause electricity consumption
Load equipment is unable to normal use.
In conclusion needing to design circuit and the method for the line loss voltage on a kind of compensation external connection to solve the prior art
The problem of.
Invention content
In order to solve in the prior art, make the voltage at load equipment end not by the shadow of line loss voltage the present invention provides a kind of
It rings, keeps the feedback circuit and feedback method that accurately compensate line loss voltage.
In order to achieve the above object, using following technical scheme：
A kind of feedback circuit of compensation line loss voltage, including：
Current detection module, the output current Io for detecting feedback circuit in real time by sampling resistor Rc；
Outer voltage feedback module, for introducing the line loss being calculated according to line loss resistance Rs and output current Io is preset
Voltage Us, and the voltage feedback value Uop on line loss voltage Us, reference voltage V REF and load is combined, export outer loop feedback
Voltage deviation Uob；
Output current inner loop feedback module, the outer loop feedback voltage deviation Uob and output current for that will receive are corresponding
Output voltage UIo is combined, output inner loop feedback circuit voltage EAP signals to power supply chip.
Further, current detection module includes：Resistance RC, resistance R10, resistance R13, resistance R14, the second operation amplifier
Device U2；
One end of a terminating resistor R10 of resistance RC, one end of another terminating resistor R13 of resistance RC, the resistance R10
The other end be connected with the positive terminal of second operational amplifier U2, the other end and second operational amplifier U2 of the resistance R13
Negative pole end and one end of resistance R14 be connected, the output end of the second operational amplifier U2 and the other end of resistance R14 with
And the input terminal of output current inner loop feedback module is connected.
Further, outer voltage feedback module includes：Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance
R6, resistance R7, resistance R8, resistance RS1, resistance RS2, the first operational amplifier U1, third operational amplifier U3, the first capacitance
C1；
The positive terminal of first operational amplifier U1 is connected with one end of resistance R1, the other end of resistance R1 ground connection, and described the
The negative pole end of one operational amplifier U1 is connected with one end of one end of resistance R3 and resistance R5, the other end of resistance R3 and load
It is connected, the output end of the other end of resistance R5 and the first operational amplifier U1 are connected, the output end and electricity of the first operational amplifier
The one end for hindering R4 is connected, the other end and 6 pins of third operational amplifier U3 of resistance R4, one end of resistance R6, resistance R7
One end and one end of the first capacitance C1 are connected, the other end of the resistance R6 is connected with reference voltage, and the resistance R7's is another
One end is connected with one end of one end of resistance RS1, resistance RS2, one end phase of the other end and resistance R8 of the first capacitance C1
Even, the other end of the resistance R8 is connected with the output end of third operational amplifier U3, the other end output electricity of the resistance RS1
Galvanic electricity pressure, the other end ground connection of the resistance RS2,5 pins of the third operational amplifier U3 are connected with one end of resistance R2,
The other end of the resistance R2 is grounded, the output end of the third operational amplifier U3 and output current inner loop feedback module it is defeated
Enter end to be connected.
Further, output current inner loop feedback module includes：Resistance R9, resistance R11, resistance R12, resistance R15, resistance
R16, four-operational amplifier U4, the second capacitance C2.
One end of resistance R11 is connected with the output end of the third operational amplifier U3 of outer voltage feedback module, the electricity
The one end for hindering the other end of R11 and 6 pins of four-operational amplifier U4, one end of resistance R15 and the second capacitance C2 is connected,
5 pins of the four-operational amplifier Ui are connected with one end of resistance R9, the other end ground connection of the resistance R9, and the described 4th
The output end of operational amplifier U4 is connected with one end of one end of resistance R12 and resistance R16, the other end of the resistance R16
Connect the other end of the second capacitance C2, another termination power supply chip of the resistance R12.
A kind of feedback method of compensation line loss voltage, including step：
S1：Measure line loss resistance Rs；
S2：Output current Io is detected in real time by accessing the sampling resistor on feedback circuit main road；
S3：By the output current Io on the line loss resistance Rs and sampling resistor of measurement, line loss voltage Us is calculated；
S4：Line loss voltage Us is introduced to outer voltage feedback module, line loss voltage Us and reference voltage V REF are carried out
It is combined with load output voltage after adding operation, output outer loop feedback voltage deviation Uob；
S5：The corresponding output voltage UIo of the outer loop feedback voltage deviation Uob of reception and output current Io are combined, output
Inner loop feedback circuit voltage EAP signals, and the inner loop feedback circuit voltage EAP signals of output are fed back into power supply chip.
The line loss resistance Rs measured in wherein step S1 includes external connection internal resistance Ra, connector contact resistance Rb.
Further, step S2 includes：
S21：The output voltage on sampling resistor Rc is amplified by amplifying circuit, obtains amplified output voltage
UIo,
S22：According to amplified output voltage UIo, sampling resistor Rc and the amplifying circuit of output, output electricity is calculated
Flow Io.
The formula for wherein calculating the line loss voltage Us in feedback circuit is：
Output current Io on line loss voltage Us=line loss resistance Rs* sampling resistors.
Further, step S4 includes：
S41：Proportionate relationship between output voltage UIo and line loss voltage Us is introduced into outer voltage feedback module；
S42：In input branch in outer voltage feedback module, according between output voltage UIo and line loss voltage Us
Proportionate relationship, the resistance in outer voltage feedback module is matched, partial pressure obtain the voltage value of line loss voltage Us；
S43：By line loss voltage Us and reference voltage V REF carry out plus operation after and load output voltage be combined, export
Outer loop feedback voltage deviation Uob.
Beneficial effects of the present invention are：
(1), line loss voltage is introduced into outer voltage feedback module by the present invention, and compensation is due to output current, external connection electricity
Line loss voltage caused by resistance and connector contact resistance makes the voltage value of electric loading equipment end keep precisely, not by output current
Influence.
(2), the present invention carries out line loss voltage and reference voltage to add operation, improves the desired value of output voltage so that
Output voltage improves, and compensates line loss voltage.
(3), the mating feedback circuit structure of the method for the present invention is terse, and implementation cost is low, using reliable.
Description of the drawings
Fig. 1 is the functional block diagram of Switching Power Supply；
Fig. 2 is the circuit diagram of the feedback circuit of this compensation line loss voltage；
Fig. 3 is the phase-shifting full-bridge current double synchronous rectifier topological structure circuit that embodiment three provides；
Fig. 4 is the compensation line loss voltage in the phase-shifting full-bridge current double synchronous rectifier topological structure circuit that embodiment three provides
Feedback circuit；
Fig. 5 is the power supply chip that embodiment three provides.
Specific implementation mode
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Embodiment one
A kind of feedback circuit of compensation line loss voltage is present embodiments provided, as shown in Figure 1 to Figure 2, this circuit includes：
Current detection module, the output current Io for detecting feedback circuit in real time by sampling resistor Rc；
Outer voltage feedback module, for introducing the line loss being calculated according to line loss resistance Rs and output current Io is preset
Voltage Us, and the voltage feedback value Uop on line loss voltage Us, reference voltage V REF and load is combined, export outer loop feedback
Voltage deviation Uob；
Output current inner loop feedback module, the outer loop feedback voltage deviation Uob and output current for that will receive are corresponding
Output voltage UIo is combined, output inner loop feedback circuit voltage EAP signals to power supply chip.
Further, current detection module includes：Resistance RC, resistance R10, resistance R13, resistance R14, the second operation amplifier
Device U2；
One end of a terminating resistor R10 of resistance RC, one end of another terminating resistor R13 of resistance RC, the resistance R10
The other end be connected with the positive terminal of second operational amplifier U2, the other end and second operational amplifier U2 of the resistance R13
Negative pole end and one end of resistance R14 be connected, the output end of the second operational amplifier U2 and the other end of resistance R14 with
And the input terminal of output current inner loop feedback module is connected.
Further, outer voltage feedback module includes：Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance
R6, resistance R7, resistance R8, resistance RS1, resistance RS2, the first operational amplifier U1, third operational amplifier U3, the first capacitance
C1；
The positive terminal of first operational amplifier U1 is connected with one end of resistance R1, the other end of resistance R1 ground connection, and described the
The negative pole end of one operational amplifier U1 is connected with one end of one end of resistance R3 and resistance R5, the other end of resistance R3 and load
It is connected, the output end of the other end of resistance R5 and the first operational amplifier U1 are connected, the output end and electricity of the first operational amplifier
The one end for hindering R4 is connected, the other end and 6 pins of third operational amplifier U3 of resistance R4, one end of resistance R6, resistance R7
One end and one end of the first capacitance C1 are connected, the other end of the resistance R6 is connected with reference voltage, and the resistance R7's is another
One end is connected with one end of one end of resistance RS1, resistance RS2, one end phase of the other end and resistance R8 of the first capacitance C1
Even, the other end of the resistance R8 is connected with the output end of third operational amplifier U3, the other end output electricity of the resistance RS1
Galvanic electricity pressure, the other end ground connection of the resistance RS2,5 pins of the third operational amplifier U3 are connected with one end of resistance R2,
The other end of the resistance R2 is grounded, the output end of the third operational amplifier U3 and output current inner loop feedback module it is defeated
Enter end to be connected.
Further, output current inner loop feedback module includes：Resistance R9, resistance R11, resistance R12, resistance R15, resistance
R16, four-operational amplifier U4, the second capacitance C2.
One end of resistance R11 is connected with the output end of the third operational amplifier U3 of outer voltage feedback module, the electricity
The one end for hindering the other end of R11 and 6 pins of four-operational amplifier U4, one end of resistance R15 and the second capacitance C2 is connected,
5 pins of the four-operational amplifier U4 are connected with one end of resistance R9, the other end ground connection of the resistance R9, and the described 4th
The output end of operational amplifier U4 is connected with one end of one end of resistance R12 and resistance R16, the other end of the resistance R16
Connect the other end of the second capacitance C2, another termination power supply chip of the resistance R12.
A kind of feedback method of compensation line loss voltage, including step：
S1：Measure line loss resistance Rs；
S2：Output current Io is detected in real time by accessing the sampling resistor on feedback circuit main road；
S3：By the output current Io on the line loss resistance Rs and sampling resistor of measurement, line loss voltage Us is calculated；
S4：Line loss voltage Us is introduced to outer voltage feedback module, line loss voltage Us and reference voltage V REF are carried out
It is combined with load output voltage after adding operation, output outer loop feedback voltage deviation Uob；
S5：The corresponding output voltage UIo of the outer loop feedback voltage deviation Uob of reception and output current Io are combined, output
Inner loop feedback circuit voltage EAP signals, and the inner loop feedback circuit voltage EAP signals of output are fed back into power supply chip.
The line loss resistance Rs measured in wherein step S1 includes external connection internal resistance Ra, connector contact resistance Rb.
Further, step S2 includes：
S21：The output voltage on sampling resistor Rc is amplified by amplifying circuit, obtains amplified output voltage
UIo,
S22：According to amplified output voltage UIo, sampling resistor Rc and the amplifying circuit of output, output electricity is calculated
Flow Io.
The formula for wherein calculating the line loss voltage Us in feedback circuit is：
Output current Io on line loss voltage Us=line loss resistance Rs* sampling resistors.
Further, step S4 includes：
S41：Proportionate relationship between output voltage UIo and line loss voltage Us is introduced into outer voltage feedback module；
S42：In input branch in outer voltage feedback module, according between output voltage UIo and line loss voltage Us
Proportionate relationship, the resistance in outer voltage feedback module is matched, partial pressure obtain the voltage value of line loss voltage Us；
S43：By line loss voltage Us and reference voltage V REF carry out plus operation after and load output voltage be combined, export
Outer loop feedback voltage deviation Uob.
Wherein as shown in Figure 1, usual line loss resistance Rs very littles, when Io is smaller, line loss voltage Us can be ignored, and open
The voltage Uo of powered-down source output and the voltage Ub for being output to load equipment end are almost the same；But it is low-voltage, high-current for exporting
Switching Power Supply, since voltage Uo is relatively low, electric current Io is very big so that the value of Us is larger relative to Uo, causes the difference of Uo and Ub
Opposite Uo is larger, and in order to ensure that the voltage Ub at load equipment end stablizes under various current conditions, voltage value is basically unchanged, needs
Line loss voltage Us is compensated.
The principle of the feedback circuit of this compensation line loss voltage is：Will first introduce line loss voltage, then by line loss voltage Us with
Reference voltage V REF is carried out plus operation, improves reference voltage, that is, improves power supply chip output voltage, so that reaching in load
Voltage be goal-selling voltage, realization method is：
First by instrument measurement line loss resistance Rs, the output electricity of feedback circuit is then detected in real time by sampling resistor Rc
Flow Io, line loss voltage Us calculated according to output current Io, since line loss voltage Us cannot be measured directly, and sampling resistor Rc with
Line loss resistance Rs series connection, so damage voltage Us is measured in circuit indirectly by sampling resistor Rc, since series connection meets Rs/Us=
Rc/URc obtains UIo, institute due to the voltage value URc very littles at the both ends Rc after being amplified R14/R13 times using operational amplifier
With the voltage URc=UIo*R13/R14 at the both ends Rc, therefore Us=Rs*UIo*R13/Rc*R14 can be calculated.
In outer voltage feedback module, line loss voltage Us is introduced, introducing method is, at 6 pins of amplifier U1
Voltage VREF on the basis of the voltage of R6 then needs that the input voltage of R7 at 6 pins of amplifier U1 is made to be line loss voltage Us, this electricity
Pressure is divided to obtain by UIo, and using amplified output voltage UIo on sampling resistor Rc, and the resistance centainly matched comes
It obtains, particularly carries out matching specific resistance using the proportionate relationship between line loss voltage Us and amplified output voltage UIo,
Meet Rs/Us=Rc/ (voltages at the both ends Rc)=Rc/UIo*R13/R14 by series connection, can obtain：Us/UIo=Rs*R13/
Rc*R14, therefore by the divider resistance at the ends proportions resistance R7, its ratio be Rs2/ (Rs1+Rs2), in each circuit
The ratio is fixed after calculating in line loss resistance measurement completion, but the single value of Rs1 and Rs2 is variable.It is logical
Normal resistance Rs2 values are that 10K Ω, Rs1 come out according to Rs2 and Rs2/ (Rs1+Rs2) ratio calculation, after carrying out resistance proportioning
The input voltage for obtaining resistance R7 is line loss voltage Us, i.e., line loss voltage Us has been introduced into outer voltage feedback module；
Then reference voltage V REF is first carried out adding operation with the line loss voltage Us introduced, this really improves benchmark electricity
The value of VREF is pressed, that is, improves output voltage, then carries out adding operation with voltage feedback value Uop again, due to output voltage
Uo feedback links are to 2 pins of operational amplifier U1, and 2 pins are negative input, therefore Uop=-Uo, that is, with output voltage Uo
It carries out subtracting operation, obtains the feedback voltage deviation after line loss voltage compensation, proportional integration correction is carried out to this deviation, obtain final
Outer voltage feedback voltage deviation Uob, feedback control loop output voltage deviation be Uob, Uob is negative.
The output voltage deviation Uob of outer voltage feedback module and output current Io are corresponded in current inner loop feedback module
Voltage UIo carry out plus operation, and composition ratio integral loop realizes that current inner loop feedback, loop output are voltage EAP, EAP
For positive number, voltage EAP is signally attached in power supply control chip.
It can be realized using the present embodiment：Line loss voltage is introduced into voltage loop, is compensated due to output current, external connection
Line loss voltage caused by resistance and connector contact resistance makes the voltage value of electric loading equipment end keep precisely, not by output electricity
The influence of stream.Line loss voltage and reference voltage are carried out to add operation, improve the desired value of output voltage so that output voltage carries
Height compensates line loss voltage.Its feedback circuit structure is terse, and implementation cost is low, using reliable.
Embodiment two
Present embodiments provide a kind of new-energy automobile Switching Power Supply, input voltage is DC230~370V, exports and is
DC14.2V/70A is typical voltage high-current output switch power source, and topological structure is using phase-shifting full-bridge current double synchronous rectifier electricity
Road, as shown in figure 3, detailed feedback circuit is as shown in figure 4, power supply chip uses UCC28950PW, minimum system such as Fig. 5 institutes
Show.
As Fig. 3 topological structure in use phase-shifting full-bridge current double synchronous rectifier topological structure for power stage circuit, and first
Grade uses clamp diode, primary 4 MOSFET models that STP25NM60N, clamp diode D1, D2 model is used to use
2 MOSFET models of STTH8R06D, synchronous rectification use IRFP4368, transformer T1 that the magnetic core of PQ40, inductance L2 is used to adopt
With the magnetic core of EI40, it is output current sampling resistor that inductance L1 and L3, which use the magnetic core of PQ3220, Rc, selects 6 2m Ω/1W patches
Piece metal sampling resistor is in parallel, and line loss resistance Rs is 0.21 Ω.If without line loss compensation, Switching Power Supply is output to load electricity
Voltage on pond can reduce, line loss voltage Us=Rs × Io=0.21 × 70=1.47V.
Such as the feedback circuit in Fig. 4, the model LM158 of amplifier U5, U6, U7, U8, using ± 12V dual power supplies, base
Quasi- voltage VREF is 5V, since output voltage Uo is DC14.2V, is more than amplifier supply voltage 12V, is first needed to output voltage Uo
It carries out being divided to 5V, dividing ratios are R30/ (R30+R27)=5/14.2, and line loss voltage Us has also carried out partial pressure in proportion.
Power supply chip U9 uses UCC28950PW, and minimum system is as shown in figure 5, and be configured with synchronous rectification signal.
The method provided in the present embodiment can be additionally used in the feedback of forward converter and resonance circuit.
Using this city embodiment, the Switching Power Supply of the new-energy automobile can pass through the feedback circuit of compensation line loss voltage
And method can reach goal-selling voltage value to realize the load of new-energy automobile, keep the voltage value essence at load equipment end
Standard is not influenced by output current, and feedback circuit structure is terse, and implementation cost is low, using reliable.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (9)
1. a kind of feedback circuit of compensation line loss voltage, which is characterized in that including：
Current detection module, the output current Io for detecting feedback circuit in real time by sampling resistor Rc；
Outer voltage feedback module, for introducing the line loss voltage being calculated according to line loss resistance Rs and output current Io is preset
Us, and the voltage feedback value Uop on line loss voltage Us, reference voltage V REF and load is combined, export outer loop feedback voltage
Deviation Uob；
Output current inner loop feedback module, the outer loop feedback voltage deviation Uob for that will receive and the corresponding output of output current
Voltage UIo is combined, output inner loop feedback circuit voltage EAP signals to power supply chip.
2. a kind of feedback circuit of compensation line loss voltage according to claim 1, which is characterized in that current detection module packet
It includes：Resistance RC, resistance R10, resistance R13, resistance R14, second operational amplifier U2；
One end of a terminating resistor R10 of resistance RC, one end of another terminating resistor R13 of resistance RC, the resistance R10's is another
One end is connected with the positive terminal of second operational amplifier U2, the other end of the resistance R13 and bearing for second operational amplifier U2
The one end extreme and resistance R14 is connected, the output end of the second operational amplifier U2 and the other end of resistance R14 and defeated
The input terminal for going out current inner loop feedback module is connected.
3. a kind of feedback circuit of compensation line loss voltage according to claim 1, which is characterized in that outer voltage feeds back mould
Block includes：Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance RS1, resistance
RS2, the first operational amplifier U1, third operational amplifier U3, the first capacitance C1；
The positive terminal of first operational amplifier U1 is connected with one end of resistance R1, the other end ground connection of resistance R1, first fortune
The negative pole end for calculating amplifier U1 is connected with one end of one end of resistance R3 and resistance R5, the other end and load phase of resistance R3
Even, the output end of the other end of resistance R5 and the first operational amplifier U1 are connected, the output end and resistance of the first operational amplifier
One end of R4 is connected, the other end and 6 pins of third operational amplifier U3 of resistance R4, one end of resistance R6, resistance R7 one
End and one end of the first capacitance C1 are connected, the other end of the resistance R6 is connected with reference voltage, and the resistance R7's is another
End is connected with one end of one end of resistance RS1, resistance RS2, and the other end of the first capacitance C1 is connected with one end of resistance R8,
The other end of the resistance R8 is connected with the output end of third operational amplifier U3, the other end output current of the resistance RS1
Voltage, the other end ground connection of the resistance RS2,5 pins of the third operational amplifier U3 are connected with one end of resistance R2, institute
State the other end ground connection of resistance R2, the input of the output end and output current inner loop feedback module of the third operational amplifier U3
End is connected.
4. a kind of feedback circuit of compensation line loss voltage according to claim 1, which is characterized in that output current inner ring is anti-
Presenting module includes：Resistance R9, resistance R11, resistance R12, resistance R15, resistance R16, four-operational amplifier U4, the second capacitance
C2,
One end of resistance R11 is connected with the output end of the third operational amplifier U3 of outer voltage feedback module, the resistance R11
The other end and one end of 6 pins of four-operational amplifier U4, one end of resistance R15 and the second capacitance C2 be connected, it is described
5 pins of four-operational amplifier U4 are connected with one end of resistance R9, the other end ground connection of the resistance R9, the 4th operation
The output end of amplifier U4 is connected with one end of one end of resistance R12 and resistance R16, another termination of the resistance R16
The other end of two capacitance C2, another termination power supply chip of the resistance R12.
5. a kind of feedback method of compensation line loss voltage, which is characterized in that including step：
S1：Measure line loss resistance Rs；
S2：Output current Io is detected in real time by accessing the sampling resistor on feedback circuit main road；
S3：By the output current Io on the line loss resistance Rs and sampling resistor of measurement, line loss voltage Us is calculated；
S4：Line loss voltage Us is introduced to outer voltage feedback module, line loss voltage Us and reference voltage V REF are carried out plus transported
It is combined with load output voltage after calculation, output outer loop feedback voltage deviation Uob；
S5：The corresponding output voltage UIo of the outer loop feedback voltage deviation Uob of reception and output current Io are combined, inner ring is exported
Feedback circuit voltage EAP signals, and the inner loop feedback circuit voltage EAP signals of output are fed back into power supply chip.
6. a kind of feedback method of compensation line loss voltage according to claim 5, it is characterised in that：
The line loss resistance Rs measured in step S1 includes external connection internal resistance Ra, connector contact resistance Rb.
7. a kind of feedback method of compensation line loss voltage according to claim 5, which is characterized in that step S2 includes：
S21：The output voltage on sampling resistor Rc is amplified by amplifying circuit, obtains amplified output voltage UIo,
S22：According to amplified output voltage UIo, sampling resistor Rc and the amplifying circuit of output, output current is calculated
Io。
8. a kind of feedback method of compensation line loss voltage according to claim 5, which is characterized in that calculate feedback circuit
In the formula of line loss voltage Us be：
Output current Io on line loss voltage Us=line loss resistance Rs* sampling resistors.
9. a kind of feedback method of compensation line loss voltage according to claim 5, which is characterized in that step S4 includes：
S41：Proportionate relationship between output voltage UIo and line loss voltage Us is introduced into outer voltage feedback module；
S42：In input branch in outer voltage feedback module, according to the ratio between output voltage UIo and line loss voltage Us
Example relationship, matches the resistance in outer voltage feedback module, and partial pressure obtains the voltage value of line loss voltage Us；
S43：By line loss voltage Us and reference voltage V REF carry out plus operation after and load output voltage be combined, export outer shroud
Feedback voltage deviation Uob.
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| CN201810475293.7A CN108549450B (en) | 2018-05-17 | 2018-05-17 | Feedback circuit and feedback method for compensating line loss voltage |
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Cited By (2)
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| CN113224948A (en) * | 2021-07-08 | 2021-08-06 | 上海芯龙半导体技术股份有限公司 | Switching power supply circuit, switching power supply chip and switching power supply system |
| CN117375388A (en) * | 2023-09-26 | 2024-01-09 | 山东艾诺智能仪器有限公司 | Self-adaptive over-power protection circuit |
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| CN108549450B (en) | 2021-01-26 |
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