CN108549450B - Feedback circuit and feedback method for compensating line loss voltage - Google Patents
Feedback circuit and feedback method for compensating line loss voltage Download PDFInfo
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- CN108549450B CN108549450B CN201810475293.7A CN201810475293A CN108549450B CN 108549450 B CN108549450 B CN 108549450B CN 201810475293 A CN201810475293 A CN 201810475293A CN 108549450 B CN108549450 B CN 108549450B
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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
Abstract
The invention discloses a feedback circuit for compensating line loss voltage, which is used for compensating the line loss voltage caused by line loss resistance in a power output circuit, and comprises: the current detection module is used for detecting the output current Io of the feedback circuit in real time through the sampling resistor Rc; the voltage outer loop feedback module is used for introducing line loss voltage Us obtained through calculation according to a preset line loss resistor Rs and an output current Io, combining the line loss voltage Us, a reference voltage VREF and a voltage feedback value Uop on a load and outputting an outer loop feedback voltage deviation Uob; and the output current inner loop feedback module is used for combining the received outer loop feedback voltage deviation Uob with the output voltage UIo corresponding to the output current and outputting an inner loop feedback circuit voltage EAP signal to the power supply chip. The line loss voltage is compensated by improving the expected value of the output voltage, so that the voltage output by the switching power supply and connected to a load end is more accurate, the maximum value of the output current can be limited, and short-circuit protection is performed.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a feedback circuit and a feedback method for compensating line loss voltage.
Background
A switching power supply is an important power conversion device and is indispensable in various industries.
When the switching power supply is in use, the output positive electrode and the output negative electrode of the switching power supply need to be connected to the electric load equipment through the external line and the connector, because the external line has internal resistance and the connector has contact resistance, the loss voltage generated when current flows through the external line and the connector is line loss voltage, and the line loss voltage causes the voltage at two ends of the electric load equipment to be lower than the voltage output by the switching power supply, particularly under the condition that the switching power supply outputs low voltage and high current, the line loss voltage is relatively large, and the voltage at two ends of the electric load equipment can be greatly lower than the voltage output by the switching power supply, so that the actual power supply voltage supplied to the electric load equipment is insufficient, and the electric load equipment can not be normally used easily.
In summary, it is necessary to design a circuit and a method for compensating the line loss voltage on the external connection line to solve the problems in the prior art.
Disclosure of Invention
In order to solve the problem in the prior art, the invention provides a feedback circuit and a feedback method for keeping accurate compensation of line loss voltage without the influence of the line loss voltage on the voltage of a load device end.
In order to achieve the purpose, the following technical scheme is adopted:
a feedback circuit for compensating for line loss voltage, comprising:
the current detection module is used for detecting the output current Io of the feedback circuit in real time through the sampling resistor Rc;
the voltage outer loop feedback module is used for introducing line loss voltage Us obtained through calculation according to a preset line loss resistor Rs and an output current Io, combining the line loss voltage Us, a reference voltage VREF and a voltage feedback value Uop on a load and outputting an outer loop feedback voltage deviation Uob;
and the output current inner loop feedback module is used for combining the received outer loop feedback voltage deviation Uob with the output voltage UIo corresponding to the output current and outputting an inner loop feedback circuit voltage EAP signal to the power supply chip.
Further, the current detection module includes: the resistor RC, the resistor R10, the resistor R13, the resistor R14 and the second operational amplifier U2;
one termination of resistance RC is connected with one end of resistance R10, and the other termination of resistance RC is connected with one end of resistance R13, the other end of resistance R10 links to each other with the positive terminal of second operational amplifier U2, the other end of resistance R13 and the negative pole end of second operational amplifier U2 and the one end of resistance R14 link to each other, the output of second operational amplifier U2 and the other end of resistance R14 and the input of output current inner loop feedback module link to each other.
Further, the voltage outer loop feedback module comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor RS1, a resistor RS2, a first operational amplifier U1, a third operational amplifier U3 and a first capacitor C1;
the positive terminal of a first operational amplifier U1 is connected with one terminal of a resistor R1, the other terminal of the resistor R1 is grounded, the negative terminal of the first operational amplifier U1 is connected with one terminal of a resistor R3 and one terminal of a resistor R5, the other terminal of the resistor R3 is connected with a load, the other terminal of the resistor R5 is connected with the output terminal of the first operational amplifier U1, the output terminal of the first operational amplifier is connected with one terminal of a resistor R4, the other terminal of the resistor R4 is connected with the 6 pin of a third operational amplifier U3, one terminal of a resistor R6, one terminal of a resistor R7 and one terminal of a first capacitor C1, the other terminal of the resistor R6 is connected with a reference voltage, the other terminal of the resistor R7 is connected with one terminal of a resistor RS1 and one terminal of a resistor RS2, the other terminal of the first capacitor C1 is connected with one terminal of a resistor R8, the other terminal of the resistor R8 is connected with the output terminal of, the other end of the resistor RS1 outputs current and voltage, the other end of the resistor RS2 is grounded, a pin 5 of the third operational amplifier U3 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the output end of the third operational amplifier U3 is connected with the input end of the output current inner loop feedback module.
Further, the output current inner loop feedback module comprises: the circuit comprises a resistor R9, a resistor R11, a resistor R12, a resistor R15, a resistor R16, a fourth operational amplifier U4 and a second capacitor C2.
One end of a resistor R11 is connected with an output end of a third operational amplifier U3 of the voltage outer loop feedback module, the other end of the resistor R11 is connected with a pin 6 of a fourth operational amplifier U4, one end of a resistor R15 and one end of a second capacitor C2, a pin 5 of a fourth operational amplifier Ui is connected with one end of a resistor R9, the other end of the resistor R9 is grounded, an output end of the fourth operational amplifier U4 is connected with one end of a resistor R12 and one end of a resistor R16, the other end of the resistor R16 is connected with the other end of the second capacitor C2, and the other end of the resistor R12 is connected with a power supply chip.
A feedback method for compensating line loss voltage comprises the following steps:
s1: measuring line loss resistance Rs;
s2: detecting the output current Io in real time by a sampling resistor connected to a main circuit of the feedback circuit;
s3: calculating line loss voltage Us through the measured line loss resistor Rs and the output current Io on the sampling resistor;
s4: introducing the line loss voltage Us into a voltage outer loop feedback module, adding the line loss voltage Us and a reference voltage VREF, combining the added line loss voltage Us and the reference voltage VREF with a load output voltage, and outputting an outer loop feedback voltage deviation Uob;
s5: the received outer loop feedback voltage deviation Uob is combined with the output voltage UIo corresponding to the output current Io, an inner loop feedback circuit voltage EAP signal is output, and the output inner loop feedback circuit voltage EAP signal is fed back to the power supply chip.
The line loss resistance Rs measured in step S1 includes external connection internal resistance Ra and connector contact resistance Rb.
Further, step S2 includes:
s21: the output voltage on the sampling resistor Rc is amplified by an amplifying circuit to obtain an amplified output voltage UIo,
s22: the output current Io is calculated from the amplified output voltage UIo, the sampling resistor Rc, and the amplifier circuit.
The formula for calculating the line loss voltage Us in the feedback circuit is as follows:
the line loss voltage Us is the line loss resistance Rs sampling the output current Io across the resistor.
Further, step S4 includes:
s41: introducing a proportional relationship between the output voltage UIo and the line loss voltage Us into a voltage outer loop feedback module;
s42: in an input branch in the voltage outer loop feedback module, matching resistors in the voltage outer loop feedback module according to a proportional relation between the output voltage UIo and the line loss voltage Us, and dividing the voltage to obtain a voltage value of the line loss voltage Us;
s43: and the line loss voltage Us and the reference voltage VREF are added and combined with the load output voltage to output an outer loop feedback voltage deviation Uob.
The invention has the beneficial effects that:
(1) the invention introduces the line loss voltage into the voltage outer ring feedback module to compensate the line loss voltage caused by the output current, the external line resistor and the connector contact resistor, so that the voltage value of the electric load equipment end is kept accurate and is not influenced by the output current.
(2) The invention adds the line loss voltage and the reference voltage, improves the expected value of the output voltage, improves the output voltage and compensates the line loss voltage.
(3) The matched feedback circuit of the method has the advantages of simple structure, low implementation cost and reliable use.
Drawings
FIG. 1 is a functional block diagram of a switching power supply;
FIG. 2 is a schematic circuit diagram of the feedback circuit for compensating line loss voltage;
fig. 3 is a circuit of a phase-shifted full-bridge current-doubling synchronous rectification topology according to a third embodiment;
fig. 4 is a feedback circuit for compensating line loss voltage in the phase-shifted full-bridge current-doubling synchronous rectification topology circuit according to the third embodiment;
fig. 5 is a power supply chip provided in the third embodiment.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example one
The present embodiment provides a feedback circuit for compensating a line loss voltage, as shown in fig. 1 to 2, the feedback circuit includes:
the current detection module is used for detecting the output current Io of the feedback circuit in real time through the sampling resistor Rc;
the voltage outer loop feedback module is used for introducing line loss voltage Us obtained through calculation according to a preset line loss resistor Rs and an output current Io, combining the line loss voltage Us, a reference voltage VREF and a voltage feedback value Uop on a load and outputting an outer loop feedback voltage deviation Uob;
and the output current inner loop feedback module is used for combining the received outer loop feedback voltage deviation Uob with the output voltage UIo corresponding to the output current and outputting an inner loop feedback circuit voltage EAP signal to the power supply chip.
Further, the current detection module includes: the resistor RC, the resistor R10, the resistor R13, the resistor R14 and the second operational amplifier U2;
one termination of resistance RC is connected with one end of resistance R10, and the other termination of resistance RC is connected with one end of resistance R13, the other end of resistance R10 links to each other with the positive terminal of second operational amplifier U2, the other end of resistance R13 and the negative pole end of second operational amplifier U2 and the one end of resistance R14 link to each other, the output of second operational amplifier U2 and the other end of resistance R14 and the input of output current inner loop feedback module link to each other.
Further, the voltage outer loop feedback module comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor RS1, a resistor RS2, a first operational amplifier U1, a third operational amplifier U3 and a first capacitor C1;
the positive terminal of a first operational amplifier U1 is connected with one terminal of a resistor R1, the other terminal of the resistor R1 is grounded, the negative terminal of the first operational amplifier U1 is connected with one terminal of a resistor R3 and one terminal of a resistor R5, the other terminal of the resistor R3 is connected with a load, the other terminal of the resistor R5 is connected with the output terminal of the first operational amplifier U1, the output terminal of the first operational amplifier is connected with one terminal of a resistor R4, the other terminal of the resistor R4 is connected with the 6 pin of a third operational amplifier U3, one terminal of a resistor R6, one terminal of a resistor R7 and one terminal of a first capacitor C1, the other terminal of the resistor R6 is connected with a reference voltage, the other terminal of the resistor R7 is connected with one terminal of a resistor RS1 and one terminal of a resistor RS2, the other terminal of the first capacitor C1 is connected with one terminal of a resistor R8, the other terminal of the resistor R8 is connected with the output terminal of, the other end of the resistor RS1 outputs current and voltage, the other end of the resistor RS2 is grounded, a pin 5 of the third operational amplifier U3 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the output end of the third operational amplifier U3 is connected with the input end of the output current inner loop feedback module.
Further, the output current inner loop feedback module comprises: the circuit comprises a resistor R9, a resistor R11, a resistor R12, a resistor R15, a resistor R16, a fourth operational amplifier U4 and a second capacitor C2.
One end of the resistor R11 is connected with an output end of a third operational amplifier U3 of the voltage outer loop feedback module, the other end of the resistor R11 is connected with a pin 6 of a fourth operational amplifier U4, one end of the resistor R15 and one end of a second capacitor C2, a pin 5 of the fourth operational amplifier U4 is connected with one end of the resistor R9, the other end of the resistor R9 is grounded, an output end of the fourth operational amplifier U4 is connected with one end of the resistor R12 and one end of the resistor R16, the other end of the resistor R16 is connected with the other end of the second capacitor C2, and the other end of the resistor R12 is connected with a power supply chip.
A feedback method for compensating line loss voltage comprises the following steps:
s1: measuring line loss resistance Rs;
s2: detecting the output current Io in real time by a sampling resistor connected to a main circuit of the feedback circuit;
s3: calculating line loss voltage Us through the measured line loss resistor Rs and the output current Io on the sampling resistor;
s4: introducing the line loss voltage Us into a voltage outer loop feedback module, adding the line loss voltage Us and a reference voltage VREF, combining the added line loss voltage Us and the reference voltage VREF with a load output voltage, and outputting an outer loop feedback voltage deviation Uob;
s5: the received outer loop feedback voltage deviation Uob is combined with the output voltage UIo corresponding to the output current Io, an inner loop feedback circuit voltage EAP signal is output, and the output inner loop feedback circuit voltage EAP signal is fed back to the power supply chip.
The line loss resistance Rs measured in step S1 includes external connection internal resistance Ra and connector contact resistance Rb.
Further, step S2 includes:
s21: the output voltage on the sampling resistor Rc is amplified by an amplifying circuit to obtain an amplified output voltage UIo,
s22: the output current Io is calculated from the amplified output voltage UIo, the sampling resistor Rc, and the amplifier circuit.
The formula for calculating the line loss voltage Us in the feedback circuit is as follows:
the line loss voltage Us is the line loss resistance Rs sampling the output current Io across the resistor.
Further, step S4 includes:
s41: introducing a proportional relationship between the output voltage UIo and the line loss voltage Us into a voltage outer loop feedback module;
s42: in an input branch in the voltage outer loop feedback module, matching resistors in the voltage outer loop feedback module according to a proportional relation between the output voltage UIo and the line loss voltage Us, and dividing the voltage to obtain a voltage value of the line loss voltage Us;
s43: and the line loss voltage Us and the reference voltage VREF are added and combined with the load output voltage to output an outer loop feedback voltage deviation Uob.
As shown in fig. 1, generally, the line loss resistor Rs is small, when Io is small, the line loss voltage Us is negligible, and the voltage Uo output by the switching power supply and the voltage Ub output to the load device end are substantially consistent; however, for a switching power supply outputting a low-voltage large current, due to a low voltage Uo and a large current Io, the value of Us is relatively large compared to Uo, so that the difference between Uo and Ub is relatively large, and in order to ensure that the voltage Ub at the load equipment end is stable under various current conditions and the voltage value is basically unchanged, the line loss voltage Us needs to be compensated.
The principle of the feedback circuit for compensating the line loss voltage is as follows: line loss voltage will be introduced earlier, then add the operation with line loss voltage Us and reference voltage VREF, improve reference voltage, improve power chip output voltage promptly to make the voltage that arrives on the load be for predetermineeing target voltage, its implementation is:
firstly, a line loss resistor Rs is measured through a meter, then an output current Io of a feedback circuit is detected in real time through a sampling resistor Rc, a line loss voltage Us is calculated according to the output current Io, the line loss voltage Us cannot be directly measured, and the sampling resistor Rc is connected with the line loss resistor Rs in series, so that the line loss voltage Us is indirectly measured through the sampling resistor Rc in the circuit, the series connection satisfies Rs/Us-Rc/URc, the voltage value URc at two ends of Rc is small, R14/R13 times is amplified through an operational amplifier to obtain UIo, and the voltage URc at two ends of Rc is UIo-R13/R14, so that Us-UIo-R13/Rc-R14 can be calculated.
In the voltage outer loop feedback module, a line loss voltage Us is introduced, in which a voltage of R6 at a pin 6 of an operational amplifier U1 is a reference voltage VREF, an input voltage of R7 at a pin 6 of an operational amplifier U1 needs to be a line loss voltage Us, the voltage is obtained by voltage division from UIo, and the line loss voltage Us is obtained by using an output voltage UIo amplified by a sampling resistor Rc and a resistor with a certain ratio, specifically, the resistor is ratio by using a ratio relation between the line loss voltage Us and the amplified output voltage UIo, and Rs/Us/(a voltage at two ends of Rc) ═ Rc/UIo R13/R14 are satisfied in series, so that: Us/UIo-Rs 13/Rc R14, therefore, by proportioning the divider resistance at the end of the resistance R7 by the proportion, the proportion is Rs2/(Rs1+ Rs2), and the proportion in each circuit is fixed after calculation after the measurement of the line loss resistance is completed, but the single value of Rs1 and Rs2 is variable. Usually, the value of the resistor Rs2 is 10KΩ, the Rs1 is calculated according to the ratio of Rs2 to Rs2/(Rs1+ Rs2), and the input voltage of the resistor R7 is line loss voltage Us after resistance matching is carried out, namely the line loss voltage Us is introduced into a voltage outer loop feedback module;
and then, adding the reference voltage VREF and the introduced line loss voltage Us, which actually increases the value of the reference voltage VREF, namely, increases the output voltage, and then adding the reference voltage VREF and the voltage feedback value UO, wherein the output voltage UO is fed back and connected to a 2 pin of an operational amplifier U1, the 2 pin is a negative input, so that the UO is-UO, namely, the output voltage UO is subtracted, the feedback voltage deviation after line loss voltage compensation is obtained, proportional integral correction is performed on the deviation, the final voltage outer ring feedback voltage deviation Uob is obtained, the feedback loop output voltage deviation is Uob, and Uob is a negative number.
And adding the output voltage deviation Uob of the voltage outer loop feedback module in the current inner loop feedback module and the voltage UIo corresponding to the output current Io to form a proportional-integral loop, so as to realize current inner loop feedback, wherein the loop output is the voltage EAP, the EAP is a positive number, and the voltage EAP signal is connected into the power supply control chip.
The embodiment can realize that: the line loss voltage is introduced into a voltage loop to compensate the line loss voltage caused by the output current, the external line resistor and the connector contact resistor, so that the voltage value of the electric load equipment end is kept accurate and is not influenced by the output current. And the line loss voltage and the reference voltage are added, so that the expected value of the output voltage is improved, and the line loss voltage is compensated. The feedback circuit has simple structure, low implementation cost and reliable use.
Example two
The embodiment provides a switching power supply for a new energy automobile, wherein the input voltage is DC 230-370V, the output is DC14.2V/70A, the switching power supply is a typical voltage and large current output switching power supply, a topological structure adopts a phase-shifted full-bridge current-doubling synchronous rectification circuit, as shown in fig. 3, a detailed feedback circuit is as shown in fig. 4, a power supply chip adopts UCC28950PW, and the minimum system is as shown in fig. 5.
For example, in the topology structure of fig. 3, a phase-shifted full-bridge current-doubling synchronous rectification topology structure is adopted as a power stage circuit, a clamp diode is adopted at a primary stage, STP25NM60N is adopted as models of 4 primary MOSFETs, STTH8R06D is adopted as models of clamp diodes D1 and D2, IRFP4368 is adopted as models of 2 synchronous rectification MOSFETs, a PQ40 magnetic core is adopted as a transformer T1, an EI40 magnetic core is adopted as an inductor L2, a PQ3220 magnetic core is adopted as inductors L1 and L3, Rc is an output current sampling resistor, 6 2m Ω/1W patch metal sampling resistors are selected to be connected in parallel, and a line loss resistor Rs is 0.21 Ω. If the line loss compensation is not carried out, the voltage output by the switching power supply to the load battery is reduced, and the line loss voltage Us is 0.21 × 70 to 1.47V.
As the feedback circuit in fig. 4, the operational amplifiers U5, U6, U7, U8 are LM158, and are powered by ± 12V dual power sources, the reference voltage VREF is 5V, and since the output voltage Uo is DC14.2V, which is greater than the operational amplifier power supply voltage 12V, the output voltage Uo needs to be divided to 5V at first, the division ratio is R30/(R30+ R27) is 5/14.2, and the line loss voltage Us is also divided in the same ratio.
The power chip U9 employs UCC28950PW, the smallest system of which is shown in fig. 5, and is configured with a synchronous rectification signal.
The method provided in the embodiment can also be used for feedback of the forward circuit and the resonant circuit.
By adopting the embodiment in the market, the switching power supply of the new energy automobile can achieve the purpose that the load of the new energy automobile can reach the preset target voltage value through the feedback circuit and the method for compensating the line loss voltage, the voltage value of the load equipment end is kept accurate and is not influenced by the output current, and the feedback circuit is simple in structure, low in implementation cost and reliable in use.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. A feedback circuit for compensating for line loss voltage, comprising:
the current detection module is used for detecting the output current Io of the feedback circuit in real time through the sampling resistor Rc; a voltage outer loop feedback module for calculating the input voltage according to a preset line loss resistor Rs and an output current Io
Combining the line loss voltage Us, the reference voltage VREF and the voltage feedback value Uop on the load to output an outer loop feedback voltage deviation Uob;
the output current inner loop feedback module is used for combining the received outer loop feedback voltage deviation Uob with the output voltage UIo corresponding to the output current and outputting an inner loop feedback circuit voltage EAP signal to the power supply chip;
the voltage outer loop feedback module comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor RS1, a resistor RS2, a first operational amplifier U1, a third operational amplifier U3 and a first capacitor C1;
the positive terminal of a first operational amplifier U1 is connected with one terminal of a resistor R1, the other terminal of a resistor R1 is grounded, the negative terminal of the first operational amplifier U1 is connected with one terminal of a resistor R3 and one terminal of a resistor R5, the other terminal of the resistor R3 is connected with a load, the other terminal of the resistor R5 is connected with the output terminal of the first operational amplifier U1, the output terminal of the first operational amplifier U1 is connected with one terminal of a resistor R4, the other terminal of the resistor R4 is connected with a pin 6 of a third operational amplifier U3, one terminal of a resistor R6, one terminal of a resistor R7 and one terminal of a first capacitor C1, the other terminal of the resistor R6 is connected with a reference voltage, the other terminal of the resistor R7 is connected with one terminal of a resistor RS1 and one terminal of a resistor RS2, the other terminal of the first capacitor C1 is connected with one terminal of a resistor R8, the other terminal of the resistor R8 is connected with the output terminal of, the other end of the resistor RS1 outputs current and voltage, the other end of the resistor RS2 is grounded, a pin 5 of the third operational amplifier U3 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the output end of the third operational amplifier U3 is connected with the input end of the output current inner loop feedback module.
2. The feedback circuit for compensating for line loss voltage as claimed in claim 1, wherein the current detection module comprises: the resistor RC, the resistor R10, the resistor R13, the resistor R14 and the second operational amplifier U2;
one termination of resistance RC is connected with one end of resistance R10, and the other termination of resistance RC is connected with one end of resistance R13, the other end of resistance R10 links to each other with the positive terminal of second operational amplifier U2, the other end of resistance R13 and the negative pole end of second operational amplifier U2 and the one end of resistance R14 link to each other, the output of second operational amplifier U2 and the other end of resistance R14 and the input of output current inner loop feedback module link to each other.
3. The feedback circuit for compensating for line loss voltage of claim 2, wherein the output current inner loop feedback module comprises: a resistor R9, a resistor R11, a resistor R12, a resistor R15, a resistor R16, a fourth operational amplifier U4, a second capacitor C2,
one end of a resistor R11 is connected to an output end of a third operational amplifier U3 of the voltage outer loop feedback module, the other end of the resistor R11 is connected to a pin 6 of a fourth operational amplifier U4, one end of a resistor R15 and one end of a second capacitor C2, the other end of the resistor R15 is connected to an output end of the second operational amplifier U2 and the resistor R14, a pin 5 of the fourth operational amplifier U4 is connected to one end of a resistor R9, the other end of the resistor R9 is grounded, an output end of the fourth operational amplifier U4 is connected to one end of a resistor R12 and one end of a resistor R16, the other end of the resistor R16 is connected to the other end of the second capacitor C2, and the other end of the resistor R12 is connected to the power supply chip.
4. A feedback method for compensating for a line loss voltage, based on the feedback circuit of any one of claims 1 to 3, comprising the steps of:
s1: measuring line loss resistance Rs;
s2: detecting the output current Io in real time by a sampling resistor connected to a main circuit of the feedback circuit;
s3: calculating line loss voltage Us through the measured line loss resistor Rs and the output current Io on the sampling resistor;
s4: introducing the line loss voltage Us into a voltage outer loop feedback module, adding the line loss voltage Us and a reference voltage VREF, combining the added line loss voltage Us and the reference voltage VREF with a load output voltage, and outputting an outer loop feedback voltage deviation Uob;
s5: the received outer loop feedback voltage deviation Uob is combined with the output voltage UIo corresponding to the output current Io, an inner loop feedback circuit voltage EAP signal is output, and the output inner loop feedback circuit voltage EAP signal is fed back to the power supply chip.
5. The feedback method for compensating for the line loss voltage as claimed in claim 4, wherein: the line loss resistance Rs measured in step S1 includes an external connection internal resistance Ra and a connector contact resistance Rb.
6. The feedback method for compensating for the line loss voltage according to claim 4,
step S2 includes:
s21: amplifying the output voltage on the sampling resistor Rc through an amplifying circuit to obtain an amplified output voltage UIo;
s22: the output current Io is calculated from the amplified output voltage UIo, the sampling resistor Rc, and the amplifier circuit.
7. The feedback method according to claim 4, wherein the formula for calculating the line loss voltage Us in the feedback circuit is:
line loss voltage Us = line loss resistance Rs sampling the output current Io across the resistor.
8. The feedback method for compensating the line loss voltage according to claim 4, wherein the step S4 comprises:
s41: introducing a proportional relationship between the output voltage UIo and the line loss voltage Us into a voltage outer loop feedback module;
s42: in an input branch in the voltage outer loop feedback module, matching resistors in the voltage outer loop feedback module according to a proportional relation between the output voltage UIo and the line loss voltage Us, and dividing the voltage to obtain a voltage value of the line loss voltage Us;
s43: and the line loss voltage Us and the reference voltage VREF are added and combined with the load output voltage to output an outer loop feedback voltage deviation Uob.
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| CN101714817A (en) * | 2009-12-09 | 2010-05-26 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
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| CN102801300A (en) * | 2012-08-30 | 2012-11-28 | 佛山市南海赛威科技技术有限公司 | Primary-side feedback controlled switching power line loss compensating system and method |
| CN103166451A (en) * | 2011-12-16 | 2013-06-19 | 富泰华工业（深圳）有限公司 | Switching power source circuit |
| CN105429460A (en) * | 2015-12-31 | 2016-03-23 | 无锡华润矽科微电子有限公司 | DC-DC converter with line loss compensation function |
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2018
- 2018-05-17 CN CN201810475293.7A patent/CN108549450B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714817A (en) * | 2009-12-09 | 2010-05-26 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN102426284A (en) * | 2011-09-08 | 2012-04-25 | 复旦大学 | Nondestructive inductor current detection circuit applicable to high-frequency step-down type voltage converter |
| CN103166451A (en) * | 2011-12-16 | 2013-06-19 | 富泰华工业（深圳）有限公司 | Switching power source circuit |
| CN102801300A (en) * | 2012-08-30 | 2012-11-28 | 佛山市南海赛威科技技术有限公司 | Primary-side feedback controlled switching power line loss compensating system and method |
| CN105429460A (en) * | 2015-12-31 | 2016-03-23 | 无锡华润矽科微电子有限公司 | DC-DC converter with line loss compensation function |
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