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A single-inductor dual-output (SIDO) buck converter controller is presented, which operates in self-adapted pseudo-continuous-conduction-mode (PCCM) with adjustable dc current levels. Freewheel switching control has been introduced to realize large load current with smaller current ripple, while cross regulation can be minimized. Furthermore, the dc current level of subconverters can be adjusted according...
This paper deals with the implementation of FM-ZCS-QRC fed Dc servo drive using micro controller. The salient feature of QRC is that the switching devices can be either switched on at zero voltage or switched off at zero current, so that switching losses are zero ideally. Switching stresses are low, volumes are low and power density is high. This property imparts high efficiency and high power density...
This paper presents a systematic approach to generate 2-phase switched capacitor DC-DC step-up converters with a given integer conversion ratio. The present method has a deterministic complexity and does not require any search. The generated charge pumps make use of theoretical minimum number of capacitors to achieve conversion ratios from 2 to 29, and almost theoretical minimum number of capacitors...
This article studies the robust tracking control problem in nonminimum phase DC-DC nonlinear switched power converters. The proposed procedure introduces a stable inversion-based iterative technique that, taking advantage of Banach's fixed point theorem, provides closed-form analytic expressions uniformly convergent to the exact solution of the corresponding inverse problem. Then, piecewise constant...
It is well known that transition current mode control for power factor corrector can reduce the reversal recovery loss for the diode. This method can be realized using discrete control integrated circuit which requires zero-crossing detection circuit. In this paper, a novel control technique for digital-controlled power factor corrector to achieve transition current mode control is proposed. The switching...
When a low voltage DC power source is used, a DC-DC converter with a high step-up voltage gain is required to raise the voltage to more applicable levels. This is typically achieved in classical converters which often have to be driven by pulse width modulation (PWM) waves with extremely high duty cycles. Although theoretically step-up converters can achieve an infinite gain as the duty cycle approaches...
The auxiliary converter (AXC) has been presented as a cost-effective solution to retrofit the conventional diode rectifier into a unity-power-factor and regeneration-enabled front-end. However, the pulse width modulation (PWM) switching of the AXC often causes circulating current between the AXC and diode rectifier. The zero vectors of each PWM cycle induce zero sequence current, which results in...
This paper presents the interleaved quasi-resonant (QR) DC-DC flyback converter, which uses two parallel-connection DC-DC flyback converters. The interleaved technique is used to control the active switches of the two flyback converters. Also, the active switches are turned on at voltage-valley condition to reduce switching losses. Thus, this converter can achieve large output power, low output-current...
In this paper, based on generalized zero vector a novel simple PWM control circuit for a three-phase inverter is presented. The proposed control circuit, consists of a simple analog circuit to achieve function of DPWM (Discontinuous Pulse Width Modulation), has several advantages such as lower switching losses, higher efficiency and voltage usage utility, pure sinusoidal output and cost down etc....
The folding and interpolating ADC has speed advantage similar to flash ADC with reduced complexity. The folding amplifier can be used to produce more than one zero-crossing point to reduce required number of comparators. This paper presents simple low voltage, low power folding amplifier with folding factor=4 for folding and interpolating ADC. The design is implemented using 0.13 um technology at...
This paper proposes a novel single-phase quasi-Z-source AC/AC converter (qZSAC). Compared to traditional single-phase Z-source AC/AC converter, the proposed qZSAC has following features: the input voltage and output voltage is sharing the same ground; the operation is in continuous current mode (CCM). The proposed qZSAC can control to shape the input current to be sinusoidal and in phase with the...
This paper presents the feasibility study of zero current soft-switching (ZCS) PWM boost DC-DC converters with auxiliary lossless active edge-resonant cells. This type of soft-switching DC-DC boost converters is effective especially for IGBTs-based DC-DC converter due to its commutation process independent on the tail current transitions. The performances of ZCS-PWM DC-DC converter topologies are...
For the renewable energy control, a cascade connection of the boost and the buck converter is proposed. Phase difference between converters in the first and the second stage plays a key role for determining conversion efficiency. The output resistance is discussed for evaluating efficiency.
Reentry, the performance of the DSP and FPGA is developed remarkably. So, fully digital control is enabled in switch mode power supplies. However, in many cases, the control system is built by very complicatedly and very difficult theories such as the adaptive control. Furthermore, in most popular PID control, its design method of the parameters is not clear, so derivation of the optimal parameters...
A classical boost converter has a limited voltage step-up ratio because of its parasitic resistances, which does not make it suitable for high step-up applications. Therefore, to obtain a high step-up capability with high efficiency, non-isolated high step-up technique based on isolated type converters is introduced in this paper. By stacking the secondary sides in addition to the primary side, high...
This paper deals with an improvement of a power efficiency of a multi-oscillated current resonant type DC-DC converter. The current resonant type converter employs generally the pulse frequency modulation and its magnetizing inductance is set relatively low. For this reason, the magnetizing current through the converter causes a power loss under a light load. In order to solve this problem, a multi-oscillated...
In this paper analysis and control of two-input buck integrated SEPIC converter, suitable for photovoltaic (PV) applications, is presented. This converter is essentially combination of individual buck and SEPIC converters. However, on account of the integration load side only one inductor is sufficient enough for performing the power conversion both in buck and SEPIC converters. The SEPIC converter,...
A bridgeless, two-inductor, interleaved Boost converter that possess voltage-doubler characteristic when it operates with a duty cycle greater than 0.5 for power factor pre-regulator is proposed in this paper. The conduction losses of the boost switches are reduced because at low line the converter operates in the voltage-doubler mode for almost the entire line period, which reduces the rms currents...
Analysis and current control using pseudo deadbeat controller (PDC) for the buck dc-dc converter is proposed in this paper. The conventional deadbeat current controller, reported in the literature, exhibit sub-harmonic oscillations and it may lead to instability in the event of parameter changes. To avoid such problems a pseudo deadbeat controller is proposed in this paper, which gives almost first...
In order to have a power supply with high voltage conversion ratio for low voltage and high current digital ICs, this paper presents a new two stage converter combined with a coupling capacitor. A bottom switch of the first stage is removed and the switching nodes of the first stage and the second stage are coupled together by the coupling capacitor. The steady state analysis is performed and the...
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