A Single Phase Voltage Regulator Module (VRM) With Stepping Inductance for Fast Transient Response

Lu, Dylan Dah-Chuan; Liu, J.C.P.; Poon, F.N.K.; Pong, M.H.

doi:10.1109/tpel.2006.889909

Cited by 55 publications

(27 citation statements)

References 14 publications

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“…With the output voltage maintained by the main PM, the auxiliary PM duty cycle, , is not restricted. Subtracting the current rise during the on-period from the fall during the offperiod, the net current rise or fall over a switching period can be found as in (5). The auxiliary PM net current rate is positive for and is negative for .…”

Section: Parallel Connect Buck Convertermentioning

confidence: 99%

“…The recovery time of the converter with the optimal-time control (6), normalised with respect to the recovery time under the charge-balance control (5), is plotted in Fig. 5.…”

Section: Optimal-time and Charge Balance Controlmentioning

confidence: 99%

“…Two methods of changing the inductance electrically have been reported in literature. Using the step-inductance technique [5], the inductance is effectively removed by shortcircuiting the secondary winding of a coupled inductor. Whilst when employing the variable inductance method, the inductance is reduced by adjusting a biasing current in an additional winding on the inductor.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Minimum charge-recovery time control with parallel connected buck converters

Tsang

Bingham

Foster

et al. 2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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Optimal-time control to minimise a converter's recovery time has thus far been reported only for single power module converters. This paper adapts the optimal-time control problem and applies it to converters based on multiple power modules. Additionally, a novel minimum charge-recovery time control is also proposed for the multiple power module converter which produces a recovery time shorter than that in the optimal-time control. A 20 W converter is used to demonstrate the improved characteristics under primary regions of operation. Results show that the transient recovery time during a load step change is improved by 75% compared to traditional optimal time control.

show abstract

Section: Parallel Connect Buck Convertermentioning

confidence: 99%

“…The recovery time of the converter with the optimal-time control (6), normalised with respect to the recovery time under the charge-balance control (5), is plotted in Fig. 5.…”

Section: Optimal-time and Charge Balance Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Minimum charge-recovery time control with parallel connected buck converters

Tsang

Bingham

Foster

et al. 2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

View full text Add to dashboard Cite

show abstract

“…To overcome this slew-rate limitation, auxiliary converter methods have been suggested [22]- [25]. Several approaches change the slew-rate using a coupled-inductor for the output-inductor [22]- [23], while the AOF methods inject transient current directly into the output [24]- [25]. These methods are efficient because auxiliary converters handle only a small amount of power.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the auxiliary converters can operate with high-frequency switching and small passive components. However, there are many problems with these devices, such as an expensive coupled inductor [22]- [23] and costly complex controller and current sensors [24], [25]. In addition, these approaches are only for voltage fluctuation regulation.…”

Section: Introductionmentioning

confidence: 99%

An Active Output Filter with a Novel Control Strategy for Passive Output Filter Reduction

Choi¹,

Cho²

2016

Journal of Power Electronics

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This paper presents a novel control strategy for passive output filter reduction using an active output filter. The proposed method achieves the dual-function of regulating the output voltage ripple and output voltage variation during load transients. The novel control strategy allows traditional simple voltage controllers to be used, without requiring the expensive current sensors and complex controllers used in conventional approaches. The proposed method is verified with results from a 125-W forward converter.

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Auxiliary bridge arm–based switching control for optimal unloading transient performance of multiphase buck converters

2020

Circuit Theory & Apps

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For a low-conversion ratio buck converter, the step-down (unloading) transient lasts much longer than the step-up transient for the same change of the load. Regarding this issue, an auxiliary bridge arm (ABA) multiphase buck converter with switching control scheme is proposed for the optimal unloading transient performance. With the ABA, the input voltage is reversely connected into the inductor current freewheeling loop during the unloading transient. In this case, the fall slew rate of the inductor current increases, because of the voltage across the inductor increase. Meanwhile, the capacitor-charge balance theory is used to calculate the switching moment and achieve the minimum settling time and the voltage overshoots. Finally, a 12-to 3.3-V two-phase synchronous buck converter prototype is built. The experimental results show that the settling time and the voltage deviation are both improved over 50% compared with that of the average current sharing scheme and the time-optimal control scheme.auxiliary bridge arm (ABA), multiphase buck converter, switching control, unloading transient performance | INTRODUCTIONThe microprocessors and digital signal processors have posed stringent requirements for its power supplies with low output voltage, high output current, and fast dynamic performance. 1 Multiphase synchronous buck converters are widely used in these applications, 2-4 because of its inherent advantages over single-phase buck converters. However, for a low-conversion ratio buck converter, the inductor current fall rate is much smaller than the rise rate. Accordingly, the step-down transient lasts much longer than the step-up transient for the same load change, and the voltage overshoot is larger than the voltage undershoot. The large voltage overshoot reduces reliability, and long setting time degrades performance. Regarding this issue, some efficient methods have been proposed to pursuit a fast load-transient response by optimizing control strategy or topological structure during the unloading transient.In previous studies, 5-12 various control methods with fast load response are reported in multiphase buck converters, such as ripple control, 5,6 hysteretic control, 7,8 sliding-mode control, 9,10 and adaptive voltage position control. 6,11,12 These control schemes could achieve the system steady-state performance well. With the constant control structure and parameters in transient and steady states, the optimal transient performance cannot be guaranteed especially when a relatively large load transient occurs. For this reason, the time-optimal control (TOC) 13-15 is provided for multiphase

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A Single Phase Voltage Regulator Module (VRM) With Stepping Inductance for Fast Transient Response

Cited by 55 publications

References 14 publications

Minimum charge-recovery time control with parallel connected buck converters

Minimum charge-recovery time control with parallel connected buck converters

An Active Output Filter with a Novel Control Strategy for Passive Output Filter Reduction

Auxiliary bridge arm–based switching control for optimal unloading transient performance of multiphase buck converters

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