The Experts below are selected from a list of 6 Experts worldwide ranked by ideXlab platform
Tom Hack - One of the best experts on this subject based on the ideXlab platform.
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2-Wire virtual remote sensing for voltage regulators: Clairvoyance marries remote sensing
Analog Circuit Design, 2011Co-Authors: Jim Williams, Jesus Rosales, Kurk Mathews, Tom HackAbstract:Publisher Summary Voltage drops in wiring can produce considerable load regulation errors in electrical systems. As load current increases, the voltage drop in the wiring increases and the voltage delivered to the system drops. The traditional approach to solving this problem, remote sensing, regulates the voltage at the load, increasing the power supply voltage to compensate for voltage drops in the wiring. While remote sensing works well, it does require an additional pair of wires to measure the load, which may not always be practical. LT4180 eliminates the need for a pair of remote sense wires by creating a virtual remote sense. Virtual remote sensing is achieved by measuring the incremental change in voltage that occurs with an incremental change in current in the wiring. This measurement can be used to infer the total DC voltage drop in the wiring, which can then be compensated for. The virtual remote sense (VRS) takes over control of the power supply via its Feedback Pin, maintaining tight regulation of load voltage. A new cycle begins when the power supply and VRS close the loop around VOUT. Both VOUT and IOUT slew and settle to a new value, and these values are stored in the VRS. The VOUT Feedback loop is opened and a new Feedback loop is set up commanding the power supply to deliver 90% of current. VOUT drops to a new value as the power supply reaches a new steady state, and this information is also stored in the VRS. At this point, the change in the output voltage for a –10% change in output current has been measured and is stored in the VRS. This voltage is used during the next VRS cycle to compensate for voltage drops due to wiring resistance.
Jim Williams - One of the best experts on this subject based on the ideXlab platform.
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2-Wire virtual remote sensing for voltage regulators: Clairvoyance marries remote sensing
Analog Circuit Design, 2011Co-Authors: Jim Williams, Jesus Rosales, Kurk Mathews, Tom HackAbstract:Publisher Summary Voltage drops in wiring can produce considerable load regulation errors in electrical systems. As load current increases, the voltage drop in the wiring increases and the voltage delivered to the system drops. The traditional approach to solving this problem, remote sensing, regulates the voltage at the load, increasing the power supply voltage to compensate for voltage drops in the wiring. While remote sensing works well, it does require an additional pair of wires to measure the load, which may not always be practical. LT4180 eliminates the need for a pair of remote sense wires by creating a virtual remote sense. Virtual remote sensing is achieved by measuring the incremental change in voltage that occurs with an incremental change in current in the wiring. This measurement can be used to infer the total DC voltage drop in the wiring, which can then be compensated for. The virtual remote sense (VRS) takes over control of the power supply via its Feedback Pin, maintaining tight regulation of load voltage. A new cycle begins when the power supply and VRS close the loop around VOUT. Both VOUT and IOUT slew and settle to a new value, and these values are stored in the VRS. The VOUT Feedback loop is opened and a new Feedback loop is set up commanding the power supply to deliver 90% of current. VOUT drops to a new value as the power supply reaches a new steady state, and this information is also stored in the VRS. At this point, the change in the output voltage for a –10% change in output current has been measured and is stored in the VRS. This voltage is used during the next VRS cycle to compensate for voltage drops due to wiring resistance.
Jesus Rosales - One of the best experts on this subject based on the ideXlab platform.
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2-Wire virtual remote sensing for voltage regulators: Clairvoyance marries remote sensing
Analog Circuit Design, 2011Co-Authors: Jim Williams, Jesus Rosales, Kurk Mathews, Tom HackAbstract:Publisher Summary Voltage drops in wiring can produce considerable load regulation errors in electrical systems. As load current increases, the voltage drop in the wiring increases and the voltage delivered to the system drops. The traditional approach to solving this problem, remote sensing, regulates the voltage at the load, increasing the power supply voltage to compensate for voltage drops in the wiring. While remote sensing works well, it does require an additional pair of wires to measure the load, which may not always be practical. LT4180 eliminates the need for a pair of remote sense wires by creating a virtual remote sense. Virtual remote sensing is achieved by measuring the incremental change in voltage that occurs with an incremental change in current in the wiring. This measurement can be used to infer the total DC voltage drop in the wiring, which can then be compensated for. The virtual remote sense (VRS) takes over control of the power supply via its Feedback Pin, maintaining tight regulation of load voltage. A new cycle begins when the power supply and VRS close the loop around VOUT. Both VOUT and IOUT slew and settle to a new value, and these values are stored in the VRS. The VOUT Feedback loop is opened and a new Feedback loop is set up commanding the power supply to deliver 90% of current. VOUT drops to a new value as the power supply reaches a new steady state, and this information is also stored in the VRS. At this point, the change in the output voltage for a –10% change in output current has been measured and is stored in the VRS. This voltage is used during the next VRS cycle to compensate for voltage drops due to wiring resistance.
Kurk Mathews - One of the best experts on this subject based on the ideXlab platform.
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2-Wire virtual remote sensing for voltage regulators: Clairvoyance marries remote sensing
Analog Circuit Design, 2011Co-Authors: Jim Williams, Jesus Rosales, Kurk Mathews, Tom HackAbstract:Publisher Summary Voltage drops in wiring can produce considerable load regulation errors in electrical systems. As load current increases, the voltage drop in the wiring increases and the voltage delivered to the system drops. The traditional approach to solving this problem, remote sensing, regulates the voltage at the load, increasing the power supply voltage to compensate for voltage drops in the wiring. While remote sensing works well, it does require an additional pair of wires to measure the load, which may not always be practical. LT4180 eliminates the need for a pair of remote sense wires by creating a virtual remote sense. Virtual remote sensing is achieved by measuring the incremental change in voltage that occurs with an incremental change in current in the wiring. This measurement can be used to infer the total DC voltage drop in the wiring, which can then be compensated for. The virtual remote sense (VRS) takes over control of the power supply via its Feedback Pin, maintaining tight regulation of load voltage. A new cycle begins when the power supply and VRS close the loop around VOUT. Both VOUT and IOUT slew and settle to a new value, and these values are stored in the VRS. The VOUT Feedback loop is opened and a new Feedback loop is set up commanding the power supply to deliver 90% of current. VOUT drops to a new value as the power supply reaches a new steady state, and this information is also stored in the VRS. At this point, the change in the output voltage for a –10% change in output current has been measured and is stored in the VRS. This voltage is used during the next VRS cycle to compensate for voltage drops due to wiring resistance.
Zhi Wei Chen - One of the best experts on this subject based on the ideXlab platform.
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Improvement Strategy of Load Regulation of Boosting Power Supply Based on PID Algorithm
Applied Mechanics and Materials, 2015Co-Authors: Sheng Zhang, Zhi Wei ChenAbstract:As one of the most important parameters of Direct Current (DC) power supply, Load regulation determines the performance of whole system. In this paper, the internal structure as well as performance parameters of LM2577 boosting converter were deeply investigated and based on this investigation we proposed two new methods of improving its Load Regulation. One method (method 1) is to replace the resistor connected to the Feedback Pin of LM2577 with a programmable potentiometer and sample the variation of output voltage using an AD converter. The potentiometer is adjusted under the control of Feedback algorithm to keep the output voltage stable, thus the load regulation enhanced. In the other method (method 2), the Feedback Pin of LM2577 is connected to an adder to stabilize the output voltage of DC power supply and increase the load regulation. A voltage divider made up of resistors divides the output voltage and provide the divided voltage to one input of the adder. The other adder input comes from DA converter controlled by microcontroller. To reduce the adjust time and increase the efficiency, PID algorithm is applied in the software part of the system. We use 12-bit AD (ADS1115), 12-bit DA (TLV 5638) and 10-bit programmable potentiometer (AD5293) to test the methods above under the condition of 5V input voltage and 600mA load current. When output is set to 7V, the load regulation is improved from 1.043%, the rate from application circuit in LM2577’s Datasheet, to 0.700% and 0.042% by applying the first and second method, respectively. When output voltage equals 12V, the improvement is from 0.658% to 0.008% and 0.008%. Meanwhile, the method 2 suppresses output voltage ripple to be less than 10mV.
