Abstract: A 1-kS/s 12-bit successive approximation register (SAR) analog-to-digital converter (ADC) which performs burst conversion is proposed to reduce the loss of the sampled analog
A multiphase quasi-resonant (QR) zero-current switching (ZCS) switched capacitor (SC) bidirectional dc-dc converter structure is proposed to reduce current ripple and
The converter employs a burst mode with boundary conduction mode (BMBCM) control to achieve high-efficiency operation over a wide power range. A start-up strategy of sharing the main power NMOS is proposed to reduce the chip area with a new ultra-low-power voltage detection circuit to control the start-up process.
An inductorless switched capacitor (SC) DC-DC voltage converter and a model based on the averaging technique are presented. The model was validated through circuit level simulations
A burst-mode switching (BMS) strategy has been verified to significantly improve the low-load efficiency of a 1P-BIDC [15]- [16] and also in other types of DC-DC converters [17]- [18] BMS, the
LLC is an excellent topology choice for designs with narrow, high voltage input and requires high efficiency across entire load range.
US20080175029A1 US11/888,480 US88848007A US2008175029A1 US 20080175029 A1 US20080175029 A1 US 20080175029A1 US 88848007 A US88848007 A US 88848007A US 2008175029 A1 US2008175029 A1 US 2008175029A1 Authority US United States Prior art keywords voltage signal main switch converter generate Prior art date 2007-01-18 Legal
This calculator converts capacitance value between units pF, nF, µF and F. The capacitor code conversion chart lets you find the capacitance by looking up the code. The first two digits are the value in picofarads, while the third is the multiplier. If no multiplier is given the result is capacitance in pF.
is why capacitor C1 is a crucial part of the topology. Figure 2.1 (Buck Converter – Basic Diagram) 3 Modes of Operation The buck converter can operate in different modes; continuous conduction mode (CCM, e.g. fixed frequency and high current) and discontinuous conduction mode (DCM, e.g. PFM at low current). Fig. 3.1 shows modeled waveforms of CCM operation to illustrate the
The converter employs a burst mode with boundary conduction mode (BMBCM) control to achieve high-efficiency operation over a wide power range. A start-up strategy of
In this paper, the effect of equivalent series resistance (ESR) of an output capacitor on the performance of a constant-on-time (COT)-controlled buck converter is
In this paper, the effect of equivalent series resistance (ESR) of an output capacitor on the performance of a constant-on-time (COT)-controlled buck converter is studied, and a pulse bursting phenomenon is revealed.
DC/DC converters operating in burst mode under light-load conditions can be improved by an appropriate selection of the inductor current that transfers energy from the input to the output.
The converter employs a burst mode with boundary conduction mode (BMBCM) control to achieve high-efficiency operation over a wide power range. A start-up strategy of sharing the main power NMOS is proposed to reduce the chip area with a new ultra-low-power voltage detection circuit to control the start-up process. In Section 2, the proposed BMBCM
Download scientific diagram | The DC/DC switching regulator in burst mode from publication: Battery - Capacitor combinations in photovoltaic powered products | This paper analyzes smart
In Burst Mode operation, [buck converters deliver] single small pulses of current to the output capacitor followed by sleep periods where the output power is supplied by the output capacitor. This reduces over all power
current that gets scaled and rectified by the transformer and rectifier circuit, the output capacitor filters the rectified ac current and outputs a DC voltage. Figure 2.1 Full-Bridge LLC converter with Full-Bridge rectifier 2.1 Converter Voltage Gain Converter gain= switching bridge gain * resonant tank gain * transformer turn ratio (Ns/Np)
An inductorless switched capacitor (SC) DC-DC voltage converter and a model based on the averaging technique are presented. The model was validated through circuit level simulations for a SC converter designed using CMOS 0.18 um technology, capable to deliver output currents up to 100 mA at a regulated low ripple 3.3 V output voltage, for input
Abstract: A 1-kS/s 12-bit successive approximation register (SAR) analog-to-digital converter (ADC) which performs burst conversion is proposed to reduce the loss of the sampled analog signal due to leakage current in the capacitors of the
In this paper we present a SC DC-DC voltage converter, a model based on averag-ing techniques and a mechanism for automatically switching to one of the two modes, of operation normal or
The feasibility of applying burst mode control in regulation of classical switched-capacitor converters is reevaluated. The results show that contrary to switched inductor based converters, this simple and easy to implement control has no efficiency advantage in terms of conduction losses over frequency modulation control when used to regulate
LLC is an excellent topology choice for designs with narrow, high voltage input and requires high efficiency across entire load range.
An inductorless switched capacitor (SC) DC-DC voltage converter and a model based on the averaging technique are presented. The model was validated through circuit level simulations for a SC converter designed using CMOS 0.18 um technology, capable to deliver output currents up to 100 mA at a regulated low ripple 3.3 V output voltage, for input voltages between 1.8 V and
DC/DC converters operating in burst mode under light-load conditions can be improved by an appropriate selection of the inductor current that transfers energy from the input to the output. A theoretical analysis evaluates the main power losses (fixed, conduction and switching losses) involved in such
A multiphase quasi-resonant (QR) zero-current switching (ZCS) switched capacitor (SC) bidirectional dc-dc converter structure is proposed to reduce current ripple and switching loss, and
In Burst Mode operation, [buck converters deliver] single small pulses of current to the output capacitor followed by sleep periods where the output power is supplied by the output capacitor. This reduces over all power consumption during light loads. This may not be true for all Step-Down converters but it helped me.
Light-load efficiency improving boost converter with the hybrid modulation of hysteresis current mode and burst mode Runyun Miao 1, Changchun Chai, Yuqian Liu1a), Hui Li1, and Yintang Yang1 Abstract This paper proposes a new method to improve the efficiency of boost converter under light load conditions by using the hybrid modu-lation of hysteresis current mode and
In this paper we present a SC DC-DC voltage converter, a model based on averag-ing techniques and a mechanism for automatically switching to one of the two modes, of operation normal or burst which uses neither inductors nor resistors as sensors for detecting the value of the output current. 2. Switched capacitor DC-DC voltage converter.
A dual mode step-down switched-capacitor DC-DC converter with adaptive switch width modulation Lianxi Liua,b *, Hao Chena, Tianyuan Huaa, Junchao Mua, Zhangming Zhua,b, Yintang Yanga,b a School of Microelectronics, Xidian University, Xi''an, 710071, PR China b Shaanxi Key Lab of Integrated Circuits and Systems, School of Microelectronics, Xidian
It indicates that the ESR of the output capacitor is one of the key factors causing pulse bursting phenomenon in COT-controlled buck converters, and the critical ESR is derived via time-domain analysis and stability analysis in the s -domain.
In general, a DC-DC converter (buck or boost) will have two methods of operation: PWM or Pulse Skipping. To pick between the two different modes, I would look at the efficiency curve in the datasheet and the load that you have. Take a look at the graph below to get an idea of what you would need to look for.
The efficiency of the proposed BMBCM-controlled boost converter with respect to the input current for different input voltages is shown in Fig. 15. The converter has the capability to handle input currents ranging from 10 µA to 100 mA, covering an input voltage range of 700 mV to 3 V. This corresponds to an input power range of 7 µW to 300 mW.
Abstract: In this paper, the effect of equivalent series resistance (ESR) of an output capacitor on the performance of a constant-on-time (COT)-controlled buck converter is studied, and a pulse bursting phenomenon is revealed.
The converter has the capability to handle input currents ranging from 10 µA to 100 mA, covering an input voltage range of 700 mV to 3 V. This corresponds to an input power range of 7 µW to 300 mW. The proposed boost converter achieves a peak converter efficiency of 94.8% at an input voltage of 3 V.
In Burst Mode operation, [buck converters deliver] single small pulses of current to the output capacitor followed by sleep periods where the output power is supplied by the output capacitor. Analog Devices LT8612 Step-Down Converter datasheet This reduces over all power consumption during light loads.
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