CN111181355B - Device and method for adjusting output voltage of power circuit - Google Patents
Device and method for adjusting output voltage of power circuit Download PDFInfo
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- CN111181355B CN111181355B CN202010060608.9A CN202010060608A CN111181355B CN 111181355 B CN111181355 B CN 111181355B CN 202010060608 A CN202010060608 A CN 202010060608A CN 111181355 B CN111181355 B CN 111181355B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011889 copper foil Substances 0.000 abstract description 9
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 244000208734 Pisonia aculeata Species 0.000 description 1
- -1 VOJ12 millivolts Chemical compound 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
-
- 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
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
-
- 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
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0019—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being load current fluctuations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a device and a method for adjusting the output voltage of a power supply circuit.A second resistor of a feedback circuit is a resistance variable resistor, and a current detector detects the output current of a load converter and transmits the output current to a controller; the controller calculates a voltage drop between the output voltage node and the load according to the output current, and adjusts the resistance value of the second resistor based on the voltage drop to adjust the output voltage at the output voltage node. The invention predicts the voltage drop of the output voltage on the copper foil, compensates the voltage drop of the copper foil path in a mode of adjusting the feedback resistance by the voltage drop, and does not pull the feedback path to a load end any more, thereby reducing the possibility of the interference of the feedback path and reducing the connection space of a lead.
Description
Technical Field
The invention relates to the field of voltage regulation, in particular to an output voltage regulation device and method of a power circuit.
Background
The functions of a typical power processing system are mainly divided into three parts, a power converter, a switch driver and a controller. Other circuits include filter circuits, feedback circuits, and protection circuits. The main on-board power architecture of the server is mainly a Buck Converter, which is a complete power circuit composed of a controller, a power Converter, a switch driving circuit, and circuits such as feedback and filtering.
At present, a pol (point of load) Converter actually feeds back an output voltage at a single point, and then compares the output voltage with a reference voltage inside a Buck Converter, so as to output a specified voltage from the pol (point of load) Converter in a negative feedback manner. If the tolerance range of the load voltage level is strict, the position of the feedback voltage is connected to the load point in application, so that the requirement that the load voltage level is within the tolerance range is met, a line is inevitably needed to connect the load and the load converter, and the space of a wire is increased; in addition, the wire must determine the accuracy of the feedback voltage, and the passing through a high noise area must be minimized to avoid the interference of the feedback voltage, which inevitably causes space waste and wiring limitation.
Disclosure of Invention
In order to solve the above problems, the present invention provides a device and a method for adjusting the output voltage of a power circuit, which control a feedback resistor based on a manner of detecting the voltage drop of an output current and pushing back a copper foil, thereby not only satisfying the stable requirement of the output voltage, but also reducing the interference and saving the earning space of a lead pull-back load.
The technical scheme of the invention is as follows: a device for adjusting the output voltage of a power supply circuit comprises a load converter, wherein an output voltage node of the load converter is connected with a load and a feedback circuit, the feedback circuit comprises a first resistor and a second resistor, one end of the first resistor is connected with the output voltage node, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is grounded, and a node between the first resistor and the second resistor is connected with a feedback end of the load converter; the second resistor is a resistance variable resistor;
the device also comprises a current detector and a controller;
the current detector is electrically connected with the controller, detects the output current of the load converter and transmits the output current to the controller;
the controller calculates a voltage drop between the output voltage node and the load according to the output current, and adjusts the resistance value of the second resistor based on the voltage drop to adjust the output voltage at the output voltage node.
Furthermore, the second resistor comprises a plurality of fixed value resistors which are connected in parallel, except that one of the fixed value resistors is a fixed value resistor, the other fixed value resistors are respectively connected with an electronic switch in series, and each electronic switch is electrically connected with the controller.
Further, the current detector is a hall sensor and is connected to a line between the output voltage node and the load.
Further, the current detector is a voltage sensor for detecting the voltage across the external output inductor of the load converter, the voltage value detected by the voltage sensor is transmitted to the controller, and the controller converts the voltage value into an output current value.
And further, the controller is connected to a background processing end, the received output current of the load converter is transmitted to the background processing end, and the background processing end simulates and calculates the voltage drop between the output voltage node and the load through the corresponding copper-paving area on the simulated printed circuit board according to the output current.
The technical scheme of the invention also comprises a method for adjusting the output voltage of the power circuit, which comprises the following steps:
detecting an output current of a load converter;
calculating a voltage drop between an output voltage node of the load converter and the load according to the detected output current;
adjusting the second resistance value according to the calculated voltage drop to adjust the output voltage at the output voltage node.
Furthermore, the second resistor comprises a plurality of fixed value resistors which are connected in parallel, and except one fixed value resistor, the other fixed value resistors are respectively connected with an electronic switch in series;
and adjusting the resistance value of the second resistor to close the corresponding electronic switch.
Further, the resistance value of the second resistor is adjusted according to the following formula:
wherein R is1Is the first resistance value, R2Second resistance adjusted to value VOSIs the original voltage value, V, at the output voltage node of the load converterOJIs the voltage drop, V, between the output voltage node of the load converter and the loadrefIs the load converter reference voltage.
Further, detecting the output current of the load converter specifically includes:
detecting the current on a line between an output voltage node of the load converter and a load through a Hall sensor;
or, the voltage sensor detects the voltage across the external output inductor of the load converter, and the voltage is converted into the output current.
Further, calculating a voltage drop between an output voltage node of the load converter and the load according to the detected output current, specifically:
and transmitting the output current of the load converter to a background processing end, and simulating the voltage drop between the calculated output voltage node and the load by the background processing end through the corresponding copper-paving area on the simulated printed circuit board according to the output current.
The device and the method for adjusting the output voltage of the power circuit predict the voltage drop of the output voltage on the copper foil, compensate the voltage drop of the copper foil path in a mode of adjusting the feedback resistance by the voltage drop, and do not pull the feedback path to a load end any more, thereby reducing the possibility of interference of the feedback path and reducing the connection space of a lead.
Drawings
Fig. 1 is a schematic block diagram of a structural principle of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a feedback circuit according to an embodiment of the invention.
FIG. 3 is a flowchart illustrating a second method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of specific examples, which are illustrative of the present invention and are not limited to the following embodiments.
Example one
The present device for outputting voltage of a power circuit is mainly a Buck power circuit, and includes a load converter 1, where the load converter 1 is a device for converting a power supply voltage output from a power output terminal of a power supply into a power supply voltage required by a load 4, such as a direct current converter (DC/DC converter).
An output voltage node 2 of the load converter 1 is connected to a load 4 and a feedback circuit comprising a first resistor R1And a second resistor R2First resistance R1One end is connected with the output voltage node 2, and the other end is connected with the second resistor R2One terminal, a second resistor R2The other end is grounded, and a first resistor R1And a second resistor R2The node between is connected to the feedback terminal of the load converter 1. This is achieved by a first resistance R1And a second resistor R2The single-point feedback output voltage is compared with the internal reference voltage, and then the specified voltage is output in a negative feedback mode.
Because there is a distance interval between the output voltage node 2 and the load 4, there is a voltage drop between them on the copper foil, if the voltage level of the load 4 (actually reaching the voltage of the load 4) is in a strict tolerance range, the feedback path is connected to the load 4 end to overcome the voltage drop problem, but a line is needed to connect the load 4 and the load converter 1, increasing the wire space, and in order to ensure the accuracy of the feedback voltage, the passing through high noise area must be reduced as much as possible to avoid the interference of the feedback voltage, which is inconvenient to implement and has an unsatisfactory effect.
As shown in fig. 1, therefore, in the above-mentioned apparatus for adjusting the output voltage of the power circuit provided in this embodiment, the second resistor R is disposed in the first resistor R2A resistance whose resistance value is variable is provided, and a current detector 3 and a controller 5 are provided. Based on the obtained output current, the voltage drop between the output voltage node 2 and the load 4 is calculated, and then the second resistor R is determined2Resistance to regulate the voltage at the output voltage node 2. The feedback path is no longer pulled to the load 4, thereby reducing the possibility of interference of the feedback path and reducing the connection space of the wire.
The current detector 3 is electrically connected with the controller 5, detects the output current of the load converter 1 and transmits the output current to the controller 5; the controller 5 calculates a voltage drop between the output voltage node 2 and the load 4 from the output current, and adjusts the second resistance value based on the voltage drop to adjust the output voltage at the output voltage node 2.
As shown in fig. 2, in particular, the second resistor R2Comprises a plurality of fixed value resistors which are connected in parallel, except one fixed value resistor, the other fixed value resistors are respectively connected with an electronic switch SW in series, each electronic switch SW is electrically connected with a controller 5, namely, a second resistor R is calculated2After the resistance value is obtained, the resistance value is determined and connected in parallel, and the action of the electronic switch is controlled according to the resistance value.
It should be noted that, when a designer tests a voltage drop range in advance, a proper parallel resistor is designed, and when the parallel resistor is actually operated, a parallel scheme can be provided for the controller 5 to call, and a proper resistance value can also be connected in parallel through algorithm calculation. The resistance adjusting mode is simple and flexible to operate, and is easier to adjust to a value close to the value compared with modes such as sliding resistance.
In this embodiment, the current detector 3 may be a hall sensor, and is connected to a line between the output voltage node 2 and the load 4 to detect the output current. A voltage sensor that detects the voltage across the external output inductor of the load converter 1 may be used, and the voltage value detected by the voltage sensor is transmitted to the controller 5, and the controller 5 converts the voltage value into the output current value.
As for the voltage drop between the output voltage node 2 and the load 4 calculated according to the output current, the simulated printed circuit board can be used for calculating the copper-laid area and actually simulating the voltage drop of the current flowing on the copper foil, so that the voltage drop of how much volt when the current is small can be predicted according to the result. After the possible variation range of the voltage drop is known, the resistor and the switch can be reserved for the variation range, namely, a proper parallel resistor is set in advance.
Specifically, the controller 5 is connected to the background processing terminal 6, and transmits the received output current of the load converter 1 to the background processing terminal 6, and the background processing terminal 6 simulates and calculates the voltage drop between the output voltage node 2 and the load 4 according to the output current through the corresponding copper-laid area on the simulated printed circuit board.
In this embodiment, the second resistor R2After connecting a resistance value in parallel, the resistance value of the reference potential to the ground (i.e. the second resistor R)2Resistance value) of the reference potential to the output (and the first resistance value R)1Invariable), the voltage at the output voltage node 2 can be adjusted based on the parallel resistance.
Wherein the second resistor R2The resistance adjustment calculation process of (1) is as follows:
deducing that the resistance value of the second resistor is adjusted according to the following formula:
wherein R is1Is the first resistance value, R2Second resistance adjusted to value VOSIs the output voltage node of the load converter 1Original voltage value, V, at point 2OJIs the voltage drop, V, between the output voltage node 2 of the load converter 1 and the load 4refIs the load converter 1 reference voltage. The regulated output voltage node 2 has a voltage value V due to the compensation of the voltage dropOSAnd VrefAnd (4) summing.
Assuming that the reference voltage of the load converter 1 is 0.6 v, the first resistor R1A resistance value of 1k ohm, a second resistor R2Fixed value resistance R21Is 1k ohms, i.e. the output voltage of the load converter 1 is set to VOS＝Vref*(R1+R2)/R11.2 volts. It is assumed that after the simulation results, there will be a 12 mV voltage drop across the output copper foil, i.e. VOJ12 millivolts, and the second resistance R is calculated2Should be 0.98k ohm, the output voltage is 1.212V, i.e. the fixed value resistor R21The voltage drop across the copper foil compensated for by a resistance of 49k ohms in parallel brought the voltage at the true load point closer to the expected 1.2 volts.
Example two
As shown in fig. 3, based on the foregoing embodiments, the present embodiment provides a method for adjusting an output voltage of a power circuit, including the following steps:
s1, detecting an output current of the load converter 1;
it should be noted that the current on the line between the output voltage node 2 of the load converter 1 and the load 4 can be detected by the hall sensor.
Or the voltage sensor detects the voltage across the external output inductor of the load converter 1 and converts the voltage into an output current.
S2, calculating a voltage drop between the output voltage node 2 of the load converter 1 and the load 4 according to the detected output current;
it should be noted that, in the present embodiment, the voltage drop is simulated by the background software. Specifically, the output current of the load converter 1 is transmitted to the background processing terminal 6, and the background processing terminal 6 simulates and calculates the voltage drop between the output voltage node 2 and the load 4 according to the output current through the corresponding copper-paving area on the simulated printed circuit board.
S3, adjusting the second resistor R according to the calculated voltage drop2Resistance to regulate the output voltage at output voltage node 2;
the second resistor R is2The circuit comprises a plurality of fixed value resistors which are connected in parallel, and except one fixed value resistor, the other fixed value resistors are respectively connected with an electronic switch SW in series. Adjusting the second resistance R2The resistance value is to close the corresponding electronic switch SW, and the resistor is connected in parallel with the fixed value resistor to adjust the second resistor R2The resistance value.
Wherein the second resistor R2The resistance value of (a) is adjusted according to the following formula:
wherein R is1Is the first resistance value, R2Second resistance adjusted to value VOSIs the original voltage value, V, at the output voltage node 2 of the load converter 1OJIs the voltage drop, V, between the output voltage node 2 of the load converter 1 and the load 4refIs the load converter 1 reference voltage.
A second resistor R2After connecting a resistance value in parallel, the resistance value of the reference potential to the ground (i.e. the second resistor R)2Resistance value) of the reference potential to the output (and the first resistor R)1The resistance value is not changed), the voltage at the output voltage node 2 can achieve the function of adjusting the voltage based on the mode of parallel resistance.
The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any non-inventive changes that can be made by those skilled in the art and several modifications and amendments made without departing from the principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A device for adjusting the output voltage of a power supply circuit comprises a load converter, wherein an output voltage node of the load converter is connected with a load and a feedback circuit, the feedback circuit comprises a first resistor and a second resistor, one end of the first resistor is connected with the output voltage node, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is grounded, and a node between the first resistor and the second resistor is connected with a feedback end of the load converter; the resistance variable resistor is characterized in that the second resistor is a resistance variable resistor;
the device also comprises a current detector and a controller;
the current detector is electrically connected with the controller, detects the output current of the load converter and transmits the output current to the controller;
the controller calculates the voltage drop between the output voltage node and the load according to the output current, and adjusts the resistance value of the second resistor based on the voltage drop so as to adjust the output voltage at the output voltage node;
the resistance of the second resistor is adjusted according to the following formula:
wherein R is1Is the first resistance value, R2Second resistance adjusted to value VOSIs the original voltage value, V, at the output voltage node of the load converterOJIs the voltage drop, V, between the output voltage node of the load converter and the loadrefIs the load converter reference voltage.
2. The apparatus of claim 1, wherein the second resistor comprises a plurality of fixed resistors connected in parallel, and each of the fixed resistors is connected in series with an electronic switch, and each of the electronic switches is electrically connected to the controller.
3. The apparatus of claim 1 or 2, wherein the current detector is a hall sensor connected to a line between the output voltage node and the load.
4. The apparatus according to claim 1 or 2, wherein the current detector is a voltage sensor for detecting a voltage across an external output inductor of the load converter, and a voltage value detected by the voltage sensor is transmitted to the controller, and the controller converts the voltage value into an output current value.
5. The apparatus according to claim 1 or 2, wherein the controller is connected to the background processing terminal, and configured to transmit the received output current of the load converter to the background processing terminal, and the background processing terminal simulates the voltage drop between the node of the calculated output voltage and the load by simulating the corresponding copper-plated area on the printed circuit board according to the output current.
6. A method of regulating an output voltage of a power supply circuit, comprising the steps of:
detecting an output current of a load converter;
calculating a voltage drop between an output voltage node of the load converter and the load according to the detected output current;
adjusting the resistance of the second resistor according to the calculated voltage drop to adjust the output voltage at the output voltage node;
the resistance of the second resistor is adjusted according to the following formula:
wherein R is1Is the first resistance value, R2Second resistance adjusted to value VOSIs the original voltage value, V, at the output voltage node of the load converterOJIs the voltage drop, V, between the output voltage node of the load converter and the loadrefIs the load converter reference voltage.
7. The method according to claim 6, wherein the second resistor comprises a plurality of fixed resistors connected in parallel, and except one of the fixed resistors, the other fixed resistors are respectively connected in series with an electronic switch;
and adjusting the resistance value of the second resistor to close the corresponding electronic switch.
8. The method according to claim 6 or 7, wherein the detecting the output current of the load converter comprises:
detecting the current on a line between an output voltage node of the load converter and a load through a Hall sensor;
or, the voltage sensor detects the voltage across the external output inductor of the load converter, and the voltage is converted into the output current.
9. The method according to claim 6 or 7, wherein the voltage drop between the output voltage node of the load converter and the load is calculated based on the detected output current, specifically:
and transmitting the output current of the load converter to a background processing end, and simulating the voltage drop between the calculated output voltage node and the load by the background processing end through the corresponding copper-paving area on the simulated printed circuit board according to the output current.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010060608.9A CN111181355B (en) | 2020-01-19 | 2020-01-19 | Device and method for adjusting output voltage of power circuit |
| PCT/CN2020/117337 WO2021143197A1 (en) | 2020-01-19 | 2020-09-24 | Apparatus and method for adjusting output voltage of power circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010060608.9A CN111181355B (en) | 2020-01-19 | 2020-01-19 | Device and method for adjusting output voltage of power circuit |
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| CN111181355A CN111181355A (en) | 2020-05-19 |
| CN111181355B true CN111181355B (en) | 2021-06-01 |
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| WO (1) | WO2021143197A1 (en) |
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| CN111181355B (en) * | 2020-01-19 | 2021-06-01 | 苏州浪潮智能科技有限公司 | Device and method for adjusting output voltage of power circuit |
| CN113726016A (en) * | 2021-09-15 | 2021-11-30 | 康威通信技术股份有限公司 | Distributed closed-loop intelligent power supply system applied to remote feed and power supply method |
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| CN105429460B (en) * | 2015-12-31 | 2019-01-25 | 无锡华润矽科微电子有限公司 | DC-DC converter with line loss compensation |
| CN111181355B (en) * | 2020-01-19 | 2021-06-01 | 苏州浪潮智能科技有限公司 | Device and method for adjusting output voltage of power circuit |
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2020
- 2020-01-19 CN CN202010060608.9A patent/CN111181355B/en active Active
- 2020-09-24 WO PCT/CN2020/117337 patent/WO2021143197A1/en active Application Filing
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| CN101632215A (en) * | 2007-02-16 | 2010-01-20 | 奥地利西门子公司 | Electronic security for a power supply |
| CN101847929A (en) * | 2009-03-23 | 2010-09-29 | 尼克森微电子股份有限公司 | Power supply control circuit with compensation function of line loss of power supply line |
| 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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| CN110086338A (en) * | 2019-05-21 | 2019-08-02 | 重庆大学 | A kind of line loss compensation circuit of DC/DC converter |
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| Publication number | Publication date |
|---|---|
| CN111181355A (en) | 2020-05-19 |
| WO2021143197A1 (en) | 2021-07-22 |
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