Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Pulse Frequency Modulation"”.
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Designing an ultra low quiescent current buck switching regulator
… regulator. The converter will use burst mode, pulse frequency modulation, and pulse width modulation to achieve control over the entire load range. The capabilities of a full BiCMOS process technology will be taken advantage of to enable implementation of good control dynamics at low currents. …
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DC-DC converters with high efficiency over wide load ranges
… the regulator automatically switches between Pulse Frequency Modulation (PPM) and Pulse Width Modulation (PWM), and also automatically selects the optimum switching MOSFET. The current sensing is done without an additional current sense resistor. PFM mode operation is synchronous to allow …
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Bi-directional Flyback Converter Circuit Design for Flapping-wing Microrobots
… with a careful component selection and a careful pulse frequency modulation, the bidirectional flyback converter can achieve a much better power consumption than a tapped boost circuit while maintaining the same or better level of performance.
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45nm direct battery DC-DC converter for mobile applications
… 75% is obtained for a 20[mu]W load at 3V. Both pulse width modulation (PWM) and pulse frequency modulation (PFM) modes of control are used. A new digital pulse width modulator (DPWM) architecture is presented which provides 75% area savings over the conventional delay line and counter based …
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Design of a wide input supply range buck-boost converter
… input drops to 0.3V. The converter operates in Pulse Frequency Modulation (PFM) mode during steady-state. Synchronous rectification operations are supported for the buck-boost converter through the implementation of a novel anti-backflow current system which greatly reduces the quiescent current …
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A study of mechanisms for discomfort glare
… light output from a quad LED light source. Pulse frequency modulation was used to control the intensity of the source and continuous pupil size measurements made it possible to calculate retinal illuminance. Discomfort glare thresholds were estimated by measuring the retinal illuminance of …
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A Two-mode Buck Converter toward High Efficiency for the Entire Load Range for Low Power Applications
… First, the baby buck mode converter adopts pulse frequency modulation (PFM) with discontinuous conduction mode (DCM) to lower the switching frequency at light load, so frequency-dependent switching and driving losses are reduced. Second, a simple control scheme, constant on-time V2 control, …
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Power management circuits for ultra-low power systems
… caps in 130 nm CMOS process. Digital pulse frequency modulation and gain selection circuits allow for efficient output voltage regulation. The converter utilizes four gain settings (1, 2/3, 1/2, 1/3) to support an output voltage of 0.4 V to 1.1 V from 1.5 V input while delivering load …
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A Constant ON-Time 3-Level Buck Converter for Low Power Applications
… to improve light load efficiency are: PFM (pulse frequency modulation) control scheme with DCM (discontinuous conduction mode) and use of Schottky diodes in lieu of the synchronous MOSFETs, Q3 and Q4. The 3-level buck converter operates in CCM for heavy load above 330 mA and DCM for light …
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A Two-Phase Buck Converter with Optimum Phase Selection for Low Power Applications
… control for low-power range, and implementing a pulse frequency modulation (PFM) control scheme with discontinuous conduction mode (DCM) to lower switching frequency. The first method is to adopt the baby-buck concept through power stage design of each phase to optimize efficiency for a specific …
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Analysis and Design of a DCM SEPIC PFC with Adjustable Output Voltage
… half bridge series resonant circuit (SRC). High frequency magnetic field is induced through the switching action to heat the pan. The power level is usually controlled through pulse frequency modulation (PFM). In such configuration, first, a bulky input differential filter is required to filter …
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Time-based control techniques for integrated DC-DC conversion
… techniques for the design of high switching frequency buck converters are presented. Using time as the processing variable, the proposed controller operates with CMOS-level digital-like signals but without adding any quantization error. A ring oscillator is used as an integrator in place of …