Digitally Controlled Low-Power DC-DC Converter with Instantaneous On-Line Efficiency Optimization

Parayandeh, Amir; Pang, Chu; Prodić, Aleksandar

doi:10.1109/apec.2009.4802649

Cited by 12 publications

(10 citation statements)

References 20 publications

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“…In [3] we proposed a dual output switch capacitor circuit for scaling the gate-drive voltage. The disadvantage of this implementation is large number of transistors required and system efficiency degradation due to the losses in the switch capacitor circuit.…”

Section: B Gate Voltage Swing Scaling Circuitmentioning

confidence: 99%

“…This can be achieved based on the readily available information in digital controller as shown in this work. Finally the controller presented here extends the operation of the system in [3] by dynamically switching to PFM mode at very light load conditions.…”

Section: Introductionmentioning

confidence: 98%

“…Additionally since the dynamic load behavior causes the SMPS to operate in suboptimal region most of the time the optimization methods can become counterproductive resulting in efficiency degradation caused by the hardware overhead needed for the optimizer implementation. In [3] we presented a digitally controlled SMPS that provides instantaneous efficiency optimization, and as such is well suited for operation with highly dynamic loads. Based on the inherently available information about the peak current value, in each switching cycle, the system sets the mode of operation such that the sum of conduction and switching losses is minimized.…”

Section: Introductionmentioning

confidence: 99%

“…Both of these techniques improve efficiency for a given operating condition by reducing the sum of conduction losses and the gate-voltage switching losses. These techniques have been implemented with digital controllers recently as shown in [1][2][3][5][6][7]. After the load transient occurs, the controller estimates the steadystate operating point and consequently adjusts the SMPS parameters to improve efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the inherently available information about the peak current value, in each switching cycle, the system sets the mode of operation such that the sum of conduction and switching losses is minimized. The system presented in [3] uses a novel dual output switch-capacitor circuit to scale the gate-drive voltage. To implement the switch-capacitor circuit with multiple voltage levels, larger number of switches in addition to a large capacitor is required.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Digitally controlled low-power DC-DC converter with segmented output stage and gate charge based instantaneous efficiency optimization

Parayandeh

Prodić

2009

2009 IEEE Energy Conversion Congress and Exposition

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This paper introduces a digital controller and a segmented power stage that dynamically change mode of operation to maximize power processing efficiency when highly dynamic loads are supplied. The controller operates as a mixedsignal peak current program mode voltage regulator, where a digital current reference is created and used for the efficiency optimization. The losses of the power stage are minimized by combining two methods. Based on the current reference, in each switching cycle, the optimal number of power switch segments and the gate voltage swing level for power MOSFETS are set through a sequence controller and a gate voltage scaling circuit. A 1.8 V, 5 W, 1 MHz buck converter prototype is built. The results verify the operation of the system and show that on-line optimization raises and flattens the efficiency curve by as much as 18%

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Section: B Gate Voltage Swing Scaling Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%