Evaluation of primary side control schemes for flyback converter with constant current output

A simple cost-effective LED driver based on the primaryside-regulation (PSR) scheme without auxiliary winding is proposed and designed. The driver operates in discontinuous conduction mode (DCM). By means of controlling the discharging and charging of an internal timing capacitor, the conduction time T on_s of the secondaryside current is monitored and the ratio of T on_s to the switching period T s is kept constant, resulting in a constant output current. The output current zero cross detecting (ZCD) signal is sensed by the negative change of power MOSFET's source voltage due to the resonance of the primary winding with the parasitic capacitor C dss of MOSFET. The driving IC and 650 V power MOSFET chips are packaged together in SOP-8. The proposed driver is implemented with few external components and its size is minimized. Experimental results show that the current variation is within ±3%, and the efficiency exceeds 80% at the output power of 3-5 W under universal input voltage.

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“…1) Interval 1: t 0 ～ t 1 In this time interval, the power switch is turned on. The primary current i Lp increases linearly (Fig.…”

Section: Design and Operation Principlementioning

confidence: 99%

A simple cost-effective PSR LED driver without auxiliary winding

Nie

Zong-guang

2013

IEICE Electron. Express

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“…The elimination of opto-coupler and feedback loop would provide significant advantages such as cost down, higher power density and lower standby power loss. Instead of using feedback loop in output side, the PSR flyback converter senses the auxiliary winding voltage during the turn-off period of main switch to indirectly obtain the output voltage [1]- [3], which is shown in Fig.1. Moreover, lots of single-stage PSR flyback control ICs utilize the auxiliary winding voltage to get the off time of main switch in order to realize power factor correction (PFC) without multiplier [4]- [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis on ringing effect of auxiliary winding in primary side regulated flyback converter

Zhang

Qian

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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The ringing effect in auxiliary winding of transformer, which may cause faulty estimation in primary side regulated flyback converter, is detailed discussed in this paper for the first time. It has been found that: (a) Ringing of auxiliary winding occurs after main switch turns off and is derived from oscillation of the current in primary winding's leakage inductance; (b) This ringing is delivered through the leakage inductance of auxiliary winding. Basis on these discussions, several schemes have been proposed for the design of converter and transformer in order to suppress this ringing effect. Simulation results and experimental results of a singlestage 16-W primary side regulated flyback converter with active power factor correction are given to validate proposed discussion.

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“…Derivation and implementation of NSS with the operation of FCs in boundary conduction mode (BCM) were presented. A detailed review of the controllers to date, including pulse frequency modulation (PFM) control, adaptive peak current value control, current estimation control, and duty cycle control for FCs is presented in Reference [25].…”

Section: Introductionmentioning

confidence: 99%

Artificial Intelligence-Based Controller for DC-DC Flyback Converter

et al. 2019

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This paper presents an intelligent voltage controller designed on the basis of an adaptive neuro-fuzzy inference system (ANFIS) for a flyback converter (FC) working in continuous conduction mode (CCM). The union of fuzzy logic (FL) and adaptive neural networks (ANN) makes ANFIS more robust against model parameters’ uncertainties and perturbations in input voltage or load current. ANFIS inherits the advantages of structured knowledge representation from FL and learning capability from NN. Comparative analysis showed that the ANFIS controller offers not only the superior transient response characteristics, but also excellent steady-state characteristics compared to those of the FL controller (FLC) and proportional–integral–derivative (PID) controllers, thus validating its superiority over these traditional controllers. For this purpose, MATLAB/Simulink environment-based simulation results are presented for validation of the proposed converter compensated system under all operating conditions.

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Evaluation of primary side control schemes for flyback converter with constant current output

Cited by 14 publications

References 5 publications

A simple cost-effective PSR LED driver without auxiliary winding

A simple cost-effective PSR LED driver without auxiliary winding

Analysis on ringing effect of auxiliary winding in primary side regulated flyback converter

Artificial Intelligence-Based Controller for DC-DC Flyback Converter

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