CN112398338B - Remote power supply voltage compensation method - Google Patents
Remote power supply voltage compensation method Download PDFInfo
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- CN112398338B CN112398338B CN202011008273.2A CN202011008273A CN112398338B CN 112398338 B CN112398338 B CN 112398338B CN 202011008273 A CN202011008273 A CN 202011008273A CN 112398338 B CN112398338 B CN 112398338B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a far-end power supply voltage compensation system which comprises a bidirectional topology direct-current converter, a switch Q3 based on a MOSFET, a cable line, a line temperature acquisition module and a DSP control unit, wherein the output end of the bidirectional topology direct-current converter is connected with the input end of the switch Q3 based on the MOSFET, the output end of the switch Q3 based on the MOSFET is connected with one end of the cable line, the other end of the cable line is connected with a remote load, the line temperature acquisition module is embedded in an insulating layer of the cable line, and the output end of the line temperature acquisition module is connected with the DSP control unit. The invention also provides a remote supply voltage compensation method. The beneficial effects of the invention are: two extra voltage detection circuits and signal conditioning circuits thereof are not needed, load end voltage compensation can be realized through voltage compensation through load current and circuit impedance parameters, and the application in a long-distance direct current power supply system is convenient.
Description
Technical Field
The present invention relates to voltage compensation systems, and more particularly, to a remote supply voltage compensation system and method.
Background
In a remote high-power dc power supply application, as the load increases, the current flowing through the cable increases, and the voltage drop from the power supply output side to the remote load will increase significantly over several hundred meters of cable due to line impedance. If the line impedance voltage drop is not compensated and controlled, the power supply voltage range of the load may exceed the working area, and the equipment stops working or is damaged.
At present, the existing technical solution is to collect the voltage of a calibration point, and a differential circuit collects the voltage of a remote device as the feedback input voltage of a controller, so as to control the voltage output of a dc voltage source according to instruction reference. This is effective in a scenario within a range of several meters, but for a power supply range of several hundred meters or more, this scheme causes wiring difficulties and increases costs because of the need for two extra sampling lines.
In addition, the common direct current source works in a single direction, when the load is switched from heavy load to light load, the output high voltage at the load side is difficult to recover to a normal range in a short time due to the inhibition effect of the impedance of a long line, so that equipment overvoltage is caused, and equipment is damaged in serious conditions.
Disclosure of Invention
To solve the problems in the prior art, the present invention provides a system and method for compensating a remote supply voltage.
The invention provides a far-end power supply voltage compensation system which comprises a bidirectional topology direct-current converter, a MOSFET-based switch Q3, a cable line, a line temperature acquisition module and a DSP control unit, wherein the output end of the bidirectional topology direct-current converter is connected with the input end of the MOSFET-based switch Q3, the output end of the MOSFET-based switch Q3 is connected with one end of the cable line, the other end of the cable line is connected with a remote load, the line temperature acquisition module is embedded in an insulating layer of the cable line, the output end of the line temperature acquisition module is connected with the DSP control unit, the output end of the DSP control unit is connected with the bidirectional topology direct-current converter, the output voltage of the bidirectional topology direct-current converter is controlled by the DSP control unit, and the impedance voltage drop of the cable line is compensated.
As a further improvement of the invention, the bidirectional topology direct current converter is a bidirectional direct current converter based on a synchronous BUCK topology.
As a further improvement of the present invention, the bidirectional dc converter includes a capacitor C1, a MOSFET Q1, a MOSFET Q2, an inductor L1 and a capacitor C2, one end of the capacitor C1 is connected to the drain of the MOSFET Q1, the other end of the capacitor C1 is grounded, the source of the MOSFET Q1 is connected to one end of the inductor L1 and the drain of the MOSFET Q2, the other end of the inductor L1 is connected to the drain of the MOSFET Q3, one end of the capacitor C2 and the input of the DSP control unit, the source of the MOSFET Q2 and the other end of the capacitor C2 are grounded, the output of the DSP control unit is connected to the gate of the MOSFET Q1 and the gate of the MOSFET Q2, the source of the MOSFET Q3 is connected to the input of the DSP control unit and one end of the cable line, the output of the DSP control unit is connected to the gate of the MOSFET Q3, the cable line and the input end of the DSP control unit, after the DSP control unit respectively samples the inductive current IL, the output voltage Vp, the output current Io and the temperature of the cable line, two paths of complementary conducted PWM signals are output through closed-loop control to respectively drive the MOSFET tube Q1 and the MOSFET tube Q2 of the bidirectional direct current converter to realize the control of the output voltage Vp.
As a further improvement of the invention, the line temperature acquisition module is an NTC thermistor.
The invention also provides a remote supply voltage compensation method, which is used for compensating and controlling the impedance voltage drop of a cable line through the remote supply voltage compensation system and comprises the following steps: when the far-end load is increased, dynamically adjusting the output voltage reference Vref of the direct-current power supply to be Vo + Io multiplied by Rwire through the output current Io on the cable line, increasing the output voltage Vp through closed-loop control, and compensating the voltage drop caused by the impedance of the cable line; when the far-end load is reduced, the output voltage Vp output is reduced through closed-loop control by dynamically adjusting the direct-current power supply output voltage reference Vref to Vo + Io multiplied by Rwire through detecting the output current Io on the cable line.
As a further improvement of the invention, the temperature of the line resistor is compensated after the temperature of the line temperature acquisition module is acquired, Rwire＝R20+(t-20)×0.004，R20Is the resistance of the line impedance at 20 ℃, and t is the currently detected temperature value.
As a further improvement of the invention, when the load current becomes smaller, the DSP control unit samples according to the current and the temperature and compensates the output voltage Vp, at the moment of detecting the change of the load current, the pulse width time of a PWM1 signal is adjusted through closed-loop control, the inductive current IL is reversely flowed for a plurality of pulse periods, the energy of the output capacitor C2 is rapidly pumped away, thereby reducing the output voltage Vp of the direct current power supply, and maintaining the stability of the load voltage Vo.
As a further improvement of the present invention, the line impedance parameter identification is calculated from the inputted cable length and cross-sectional area, or the line impedance is calculated from the operating characteristics of the RC circuit by sampling the current response after the output voltage Vp is stabilized and opening the switch Q3.
The invention has the beneficial effects that:
1) two extra voltage detection circuits and signal conditioning circuits thereof are not needed, the load end voltage compensation can be realized through voltage compensation through load current and circuit impedance parameters, and the application in a long-distance direct current power supply system is more convenient;
2) the bidirectional direct-current converter replaces a common direct-current converter, and by applying the characteristic that the energy of the bidirectional direct-current converter can flow reversely, when a far-end load is switched from a heavy load to a light load, the energy of a power output capacitor is rapidly pumped away, so that the voltage stability of the load can be ensured, and the load is prevented from being damaged by the rapid rise of the voltage.
Drawings
Fig. 1 is a schematic diagram of a remote supply voltage compensation system according to the present invention.
Fig. 2 is a schematic diagram of a DSP control unit of a remote supply voltage compensation system according to the present invention.
Fig. 3 is a schematic diagram of the dynamic adjustment of the load switching instant of the remote supply voltage compensation system according to the present invention.
Detailed Description
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
As shown in fig. 1 to 2, a remote supply voltage compensation system includes:
1. the bidirectional direct current converter based on the synchronous BUCK topology is used as a power supply voltage source, and other bidirectional topologies can be used;
2. the MOSFET-based switch Q3 cuts off power supply to external equipment in time when overcurrent occurs;
3. the cable line impedance parameter identification module is used for detecting the line impedance parameters on line;
4. the line temperature acquisition module of the line temperature acquisition module (or other temperature sensors) is used for temperature compensation of line impedance;
5. and the DSP control unit is used for finishing the function control and realization of the modules.
The remote power supply voltage compensation system can ensure that the voltage of the load end keeps stable without an additional voltage sampling line. When the far-end load is switched from heavy load to light load, the bidirectional direct current power supply can immediately feed back the energy of the output capacitor to the front end, so that the output voltage is rapidly reduced, and the voltage stability of the far-end load side is maintained.
The bidirectional direct current converter consists of a capacitor C1, a MOSFET tube Q1, a MOSFET tube Q2, an inductor L1 and a capacitor C2, wherein the input voltage added to the capacitor C1 passes through the bidirectional direct current converter, and the output voltage is added to the capacitor C2. The input end of the MOSFET-based switch Q3 is connected with the output end of the bidirectional direct current converter, the output end of the switch Q3 is connected with one end of the cable line, and the other end of the cable line is connected with a remote load. The NTC thermistor is embedded in a wire insulating layer, the output of the NTC thermistor is connected with the DSP control unit, and the DSP control unit outputs two complementary conducted PWM signals (PWM1 and PWM2) to drive the MOSFET Q1 and the MOSFET Q2 of the bidirectional direct-current converter to realize the control of the output voltage Vp through closed-loop control after sampling the inductive current IL, the output voltage Vp, the output current Io and the NTC temperature of the thermistor.
The control process of the remote supply voltage compensation system is as follows:
(1) when the far-end load is increased, the reference voltage Vref of the output voltage of the direct current power supply is dynamically adjusted to be Vo + Io multiplied by Rwire by detecting the current Io on the line, and the voltage drop caused by the line impedance is compensated by increasing the output voltage Vp of the power supply through closed-loop control. When the far-end load is reduced, the output voltage reference of the direct-current power supply is dynamically adjusted through detecting the current Io on the line, and the output voltage Vp of the power supply is reduced through closed-loop control.
(2) Because the scheme does not directly detect the voltage at the remote load end, the voltage compensation parameter is directly related to the line resistance, when the temperature of the cable rises, the line impedance changes obviously, mainly the resistance value changes, and when the temperature of the cable rises to 50 ℃, the impedance changes by 20 percent, so that the influence of the visible temperature cannot be ignored.
(3) When the NTC temperature is collected, the temperature of the line resistor is compensated, Rwire＝R20+(t-20)×0.004，R20Is the resistance of the line impedance at 20 ℃, and t is the currently detected temperature value.
(4) Fig. 3 illustrates the process of compensating the output voltage by the DSP controller according to the current and temperature sampling when the load current becomes smaller at time t1, and at the moment of detecting the change of the load current, the pulse width time of the PWM1 is adjusted by closed-loop control, so that the inductor current reversely flows for several pulse periods, and the energy of the output capacitor C2 is rapidly pumped away to reduce the output voltage Vp of the dc power supply, thereby maintaining the stability of the load voltage Vo.
(5) The line impedance parameter identification can be calculated according to the length and the sectional area of an input cable, or can be calculated according to the working characteristics of an RC circuit by opening a switch Q3 and sampling current response after the output voltage Vp is stabilized.
The remote power supply voltage compensation system and method provided by the invention have the following advantages:
the scheme 1 does not need two additional voltage detection circuits and signal conditioning circuits thereof, can realize load terminal voltage compensation through a voltage compensation algorithm by load current and circuit impedance parameters, and is more convenient to apply in a long-distance direct current power supply system;
2, the bidirectional DC converter replaces a common DC converter, and by applying the characteristic that the energy of the bidirectional DC converter can flow reversely, when the far-end load is switched from heavy load to light load, the energy of the power output capacitor is rapidly pumped away, so that the voltage stability of the load can be ensured, and the load is prevented from being damaged by the rapid rise of the voltage.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (4)
1. A method for compensating for a remote supply voltage, comprising: the far-end power supply voltage compensation system comprises a bidirectional topological direct-current converter, a MOSFET-based switch Q3, a cable line, a line temperature acquisition module and a DSP control unit, wherein the output end of the bidirectional topological direct-current converter is connected with the input end of the MOSFET-based switch Q3, the output end of the MOSFET-based switch Q3 is connected with one end of the cable line, the other end of the cable line is connected with a remote load, the line temperature acquisition module is embedded in an insulating layer of the cable line, the output end of the line temperature acquisition module is connected with the DSP control unit, the output end of the DSP control unit is connected with the bidirectional topological direct-current converter, the output voltage of the bidirectional topological direct-current converter is controlled by the DSP control unit, the impedance voltage drop of the cable line is compensated, and the bidirectional topological direct-current converter is based on a synchronous BUCK topology, the bidirectional direct current converter comprises a capacitor C1, a MOSFET tube Q1, a MOSFET tube Q2, an inductor L1 and a capacitor C2, one end of the capacitor C1 is connected with the drain of the MOSFET tube Q1, the other end of the capacitor C1 is grounded, the source of the MOSFET tube Q1 is respectively connected with one end of the inductor L1 and the drain of the MOSFET tube Q2, the other end of the inductor L1 is respectively connected with the drain of the MOSFET-based switch Q3, one end of the capacitor C2 and the input end of a DSP control unit, the source of the MOSFET tube Q2 and the other end of the capacitor C2 are grounded, the output end of the DSP control unit is respectively connected with the gate of the MOSFET tube Q1 and the gate of the MOSFET tube Q2, the source of the MOSFET-based switch Q3 is respectively connected with the input end of the DSP control unit and one end of a cable line, the output end of the DSP control unit is connected with the gate of the MOSFET-based switch Q3, and the input end of the cable line is connected with the input end of the DSP control unit, after the DSP control unit respectively samples the inductive current IL, the output voltage Vp, the output current Io and the temperature of a cable line, two paths of complementary conducted PWM signals are output through closed-loop control to respectively drive an MOSFET tube Q1 and an MOSFET tube Q2 of the bidirectional direct-current converter to realize the control of the output voltage Vp;
through the far-end power supply voltage compensation system, the compensation control is carried out on the impedance voltage drop of the cable line, and the method comprises the following steps: when the far-end load is increased, dynamically adjusting the output voltage reference Vref of the direct-current power supply to be Vo + Io multiplied by Rwire through the output current Io on the cable line, increasing the output voltage Vp through closed-loop control, and compensating the voltage drop caused by the impedance of the cable line; when the far-end load is reduced, dynamically adjusting the output voltage reference Vref of the direct-current power supply to be Vo + Io multiplied by Rwire by detecting the output current Io on a cable line, and reducing the output voltage Vp output by closed-loop control;
when the temperature of the line temperature acquisition module is acquired, temperature compensation is carried out on the line resistor, Rwire＝R20+(t-20)×0.004，R20Is the resistance of the line impedance at 20 ℃, and t is the currently detected temperature value.
2. The remote supply voltage compensation method of claim 1, wherein: the line temperature acquisition module is an NTC thermistor.
3. The remote supply voltage compensation method of claim 1, wherein: when the load current becomes small, the DSP control unit samples according to the current and the temperature to compensate the output voltage Vp, at the moment of detecting the change of the load current, the pulse width time of a PWM1 signal is adjusted through closed-loop control, the inductive current IL is reversely flowed for a plurality of pulse periods, the energy of the output capacitor C2 is rapidly pumped away, and therefore the output voltage Vp of the direct-current power supply is reduced, and the stability of the load voltage Vo is maintained.
4. The remote supply voltage compensation method of claim 1, wherein: the line impedance parameter identification is calculated according to the length and the sectional area of the input cable, or the line impedance is calculated according to the working characteristics of the RC circuit by opening the switch Q3 and sampling the current response after the output voltage Vp is stabilized.
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| CN202011008273.2A CN112398338B (en) | 2020-09-23 | 2020-09-23 | Remote power supply voltage compensation method |
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| CN202011008273.2A CN112398338B (en) | 2020-09-23 | 2020-09-23 | Remote power supply voltage compensation method |
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| CN112398338B true CN112398338B (en) | 2022-05-20 |
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| CN117724561A (en) * | 2023-08-25 | 2024-03-19 | 荣耀终端有限公司 | Power supply voltage regulating circuit and electronic equipment |
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| CN101980096A (en) * | 2010-10-13 | 2011-02-23 | 北京星网锐捷网络技术有限公司 | Power supply compensation method and power supply compensation circuit |
| CN106558882A (en) * | 2016-11-18 | 2017-04-05 | 北京航天发射技术研究所 | A kind of self-adaptive regulating and method of this Remote feeding of power supply voltage |
| CN108733117A (en) * | 2018-04-28 | 2018-11-02 | 北京机械设备研究所 | A kind of line drop control device of servo mechanism power supply distal end voltage stabilizing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| ES2234794T3 (en) * | 2001-07-16 | 2005-07-01 | Axa Power A/S | COMPENSATION OF THE CABLE VOLTAGE FALL IN AN ELECTRICAL POWER SUPPLY SYSTEM. |
| KR102116788B1 (en) * | 2012-08-03 | 2020-05-29 | 온세미컨덕터코리아 주식회사 | Cable compensation circuit |
| CN103780096A (en) * | 2014-01-24 | 2014-05-07 | 上海新进半导体制造有限公司 | Switch power source, control chip and method for voltage compensation for charging cable |
| CN204304776U (en) * | 2015-01-21 | 2015-04-29 | 航天长峰朝阳电源有限公司 | Auto-compensation load terminal voltage type DC/DC converter |
| CN205725496U (en) * | 2016-03-23 | 2016-11-23 | 苏州美思迪赛半导体技术有限公司 | A kind of line loss compensation system of primary side feedback Switching Power Supply |
| US10594216B2 (en) * | 2018-03-23 | 2020-03-17 | Dell Products, L.P. | Configurable voltage drop compensation method and apparatus for voltage regulators |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980096A (en) * | 2010-10-13 | 2011-02-23 | 北京星网锐捷网络技术有限公司 | Power supply compensation method and power supply compensation circuit |
| CN106558882A (en) * | 2016-11-18 | 2017-04-05 | 北京航天发射技术研究所 | A kind of self-adaptive regulating and method of this Remote feeding of power supply voltage |
| CN108733117A (en) * | 2018-04-28 | 2018-11-02 | 北京机械设备研究所 | A kind of line drop control device of servo mechanism power supply distal end voltage stabilizing |
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