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This paper presents adaptive ripple-based constant on-time control architecture for buck converter ICs with wide duty ratio applications. An internal ramp compensation with emulating inductor current ripple is implemented to solve the ripple oscillation instability issue when using low-ESR output capacitors in buck converters. Therefore, no external compensation is required to simplify the system...
A new equivalent circuit model is presented to predict the small-signal characteristic of current-mode control with DCR current sensing accurately, and a simple auto-tuning method is proposed to solve the issue of time constant mismatch in DCR current sensing. The model shows that the mismatch between the current sensing RC network and the output inductor makes the output impedance deviate away from...
A primary side controlled offline Flyback LED driver is an very attractive LED driver solution due to its low component cost and high efficiency. However, as any other single-stage LED driver, it produce significant low frequency ripple current. In this paper, an innovative primary side controlled Flyback LED driver with low frequency ripple cancellation has been proposed. The low frequency ripple...
This paper presents an integrated buck-type dimmable LED driver for high-brightness lighting applications. A lossless synchronous current control is developed to enable the driver to operate at high operation frequencies and achieve high current accuracy over a wide range of input voltages and output LED loads. The driver power efficiency is also benefited from realizing the synchronous rectification...
The bridgeless power-factor-correction (PFC) converter possesses higher efficiency than the conventional boost-type PFC converter due to its reduced conduction voltage drop and conduction loss. The conventional multiloop control needs to sense the input current to yield the desired sinusoidal current waveform. This paper presents a control method for bridgeless PFC converter to provide sinusoidal...
In this paper is presented a synchronous reference frame control strategy for single-phase active power filter. The presented system is based on a selective harmonic elimination approach and allows for the fundamental reactive power compensation and harmonic elimination. The control system is carried out on a synchronous frame, which brings robustness and simplicity to the whole system.
The paper presents novel transformer-flux-balancing control methods for the isolated bidirectional full-bridge (FB) converter with active clamp and the bidirectional dual-active bridge (DAB) converter. Both approaches are based on the sensing and control of the transformer magnetizing current. For the isolated bidirectional FB converter the magnetizing current is obtained by sensing a single current,...
In this paper, it is shown that in the three-phase six-switch boost PFC rectifier with average-current control and unbalanced input-voltage and/or input-current sensing gains, the current controller with proportional (P) compensation exhibits lower total harmonic distortion (THD) and higher power factor (PF) compared with that of proportional and integral (PI) compensation. It is also shown that the...
The purpose of this paper is to outline the effects of dye-sensitised solar cell (DSSC) configuration on useable output power provided through low-power, step-up DC-DC converters. It is shown that by connecting DSSCs in series rather than in parallel, higher power conversion efficiency is achieved due to increased cell voltage, and this in turn results in higher power delivery. Limitations to varying...
Among all the semiconductor devices, the transistors are by far the most important ones; almost all of them are three pin devices (MOSFET, BJT, IGBT) and on the contrary of the diodes they have a driving section which makes them more sensitive to issues related to the interaction between power to handle and input signal. Aim of the article is to illustrate the limitation that is related to a 3 pin...
Differential power processing (DPP) is a power electronics system architecture that configures DC-DC converters in parallel with the PV string to improve its power yield. The parallel nature of the DPP architecture brings a number of benefits such as low converter power rating and low power losses, all of which make DPP especially suitable for sub-module level maximum power point tracking (MPPT)...
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