Online Calibration of MOSFET On-State Resistance for Precise Current Sensing

Zhang, Yang; Zane, Regan; Prodić, Aleksandar; Erickson, Robert W.; Maksimović, Dragan

doi:10.1109/lpel.2004.839635

Cited by 44 publications

(17 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 shows a conventional current sharing scheme where each phase current has to be sensed and then compared to a reference through a current sharing loop to generate each phase duty cycle that will result in the desired current sharing ratio, say equal phase current sharing in this discussion. There are several current sensing schemes including inducto' s DCR sensing scheme and FET on-resistance sensing scheme [1,5].…”

Section: Proposed Efficiency Based Current Sharing -First Concepmentioning

confidence: 99%

“…Most current sharing techniques are based on comparing phase currents after sensing them using one of the sensing methods [1][2][3][4][5][6]. The difficulties and disadvantages of such techniques include a dependeny on sensing accuracy, which may require calibration and is affected by sensing components parasitic and aging, they require the design of a complicated loop with additional circuitries, and they may not always result in optimum current sharing for the highest power conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel Current Sharing Schemes for Multiphase Converters with Digital Controller Implementation

Qahouq

Huang

Huard

et al. 2007

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

View full text Add to dashboard Cite

Multiphase converters require a current sharing loop to maintain equal or desired current sharing between phases or paralleled modules. Conventional current sharing schemes are based on sensing each phase current to provide the current information to the control loop. Such schemes have disadvantages including the fact that they operate to generate a pre-set sharing ratio that is independent of converter efficiency value, they are highly affected by the sensing accuracy of each phase, and they require large associated sensing circuitries and off-line calibration. In this paper, new efficiency based current sharing concepts and schemes are proposed and discussed to eliminate or reduce the disadvantages of conventional schemes. The proposed concepts are based on dynamically maximizing the efficiency (minimizing power losses) of the converter to achieve the optimum current sharing ratio. They also provide schemes that are independent of sensing accuracy and require a reduced number of sensors and associated circuitries. The proposed schemes can be used for current sharing as stand-alone designs or can be combined with conventional schemes to achieve online current sharing loop calibration. Digital controller implementation is presented utilizing flexibility and other advantages of digital controllers. Experimental results are presented to support the theoretical analysis.

show abstract

Section: Proposed Efficiency Based Current Sharing -First Concepmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Current Sharing Schemes for Multiphase Converters with Digital Controller Implementation

Qahouq

Huang

Huard

et al. 2007

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

View full text Add to dashboard Cite

show abstract

“…Thus, it requires proper calibration for accurate current sensing. One such method is presented in [6], but it requires an additional precision sense resistor and a MOSFET for calibration purposes. Moreover, in any switching converter, there will be voltage ringing at the source drain terminals due to the presence of stray inductance and capacitances.…”

Section: Department Of Electrical and Computer Engineeringmentioning

confidence: 99%

“…4). tL L-.VL.dt (6) L Such a scheme, however, requires the inductance value to be known. In practice, any inductance used in the converter will come with an associated DC resistance.…”

Section: Department Of Electrical and Computer Engineeringmentioning

confidence: 99%

Giant Magneto Resistive (GMR) effect based Current Sensing Technique for DC/DC Converters

Singh

Khambadkone

2007

IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society

View full text Add to dashboard Cite

Current sensing is one of the important function in a DC-DC Converter. It may be used for implementing current mode control or for achieving current sharing in a paralleled converters. Many current sensing schemes have been reported in literature, but they are either lossy or they require precise knowledge of the component value. In this paper a new Giant Magneto Resistive (GMR) effect based sensor is used for low voltage, high current VRM type applications. Since the current sensing is based on magnetic field, thus the sensing accuracy depends upon the placement of sensor on the conductor. Various implementation issues while using such a sensor are studied and finally the performance of the sensor is studied on a 1V/15A buck converter switching at 1MHz.

show abstract

“…Conventional current sharing schemes rely on sensing, by using one of the sensing techniques, and comparing of phase's current as presented in the literature [12][13][14]. The drawback of such schemes and techniques include the dependence on sensing accuracy, which may require tedious calibration in practical applications.…”

Section: Introductionmentioning

confidence: 99%

A self-calibration scheme for improved current share of multiphase DC-DC converter

Liu

Cheng

et al. 2012

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

View full text Add to dashboard Cite

In this paper, a self-calibration control scheme is proposed to improve the current share among each phase of multiphase DC-DC converters. The proposed control scheme is based upon look-up table method to automatically tune the pre-stored parameters for compensated in output inductance. Additionally, the digital voltage mode control and current loop with DCR (Direct Current Resistance) sensing method is implemented. As a result, the proposed scheme provides a low cost solution with ease implementation due to it is fully design by digital control technique without any external phase compensation element. The proposed scheme is verified on 12 V input with 1.2 V output, 60 A, 3-phases interleaving DC-DC buck converter and the simulation and experimental results are presented to demonstrate the theoretical analysis.

show abstract

Online Calibration of MOSFET On-State Resistance for Precise Current Sensing

Cited by 44 publications

References 5 publications

Novel Current Sharing Schemes for Multiphase Converters with Digital Controller Implementation

Novel Current Sharing Schemes for Multiphase Converters with Digital Controller Implementation

Giant Magneto Resistive (GMR) effect based Current Sensing Technique for DC/DC Converters

A self-calibration scheme for improved current share of multiphase DC-DC converter

Contact Info

Product

Resources

About