Digital Control for Improved Efficiency and Reduced Harmonic Distortion Over Wide Load Range in Boost PFC Rectifiers

Chen, Fu-Zen; Maksimović, Dragan

doi:10.1109/tpel.2010.2050702

Cited by 116 publications

(34 citation statements)

References 19 publications

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“…Valley switching is implemented using a state-machine in the digital controller, similar to [11,16]. The state-machine is programmed such that the switch turns on at the first valley switching point after the optimum switching period T S,OPT stored in the look-up table.…”

Section: A Frequency Hopping Mechanism #1mentioning

confidence: 99%

On-line efficiency optimization in flyback dc-dc converters over wide ranges of operating conditions

Kang

Maksimović

Cohen

2011

2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper presents a look-up table based digital control approach to on-line efficiency optimization over wide ranges of operating conditions. The proposed digital controller allows programmable modes of operation based on off-line efficiency characterization and optimization. Applied to a flyback dc-dc converter, the controller adopts valley switching in discontinuous conduction mode (DCM), which significantly reduces the MOSFET turn-on switching loss. Furthermore, solutions to the problem related to undesirable frequency hopping, commonly observed in other valley-switching control schemes, are presented. Dynamic operation of the controller demonstrates smooth mode transitions and consistent transient responses over various operating conditions. Experimental results show that efficiency of a low-cost 65-W flyback prototype exceeds 92% at all operating points over approximately 3:1 range of input voltages and 10:1 range of loads.

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Section: A Frequency Hopping Mechanism #1mentioning

confidence: 99%

On-line efficiency optimization in flyback dc-dc converters over wide ranges of operating conditions

Kang

Maksimović

Cohen

2011

2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Various mode boundary detection methods have been reported in [6]- [7]. In [6], additional circuitry is employed in the controller to detect zero crossings of the inductor voltage.…”

Section: Duty Cycle Command Feedforwardmentioning

confidence: 99%

Accurate mode boundary detection in digitally controlled boost power factor correction rectifiers

Moon

Corradini

Maksimović

2010

2010 IEEE Energy Conversion Congress and Exposition

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This paper presents an accurate mode boundary detection technique for digitally controlled boost power factor correction (PFC) rectifiers. Auto-tuning of the current and voltage control loops as well as estimation of power-stage parameters L and C are accomplished using sinusoidal perturbations injected into the control loops. The estimated L value acquired by this perturbation based tuning process is used to improve the detection of the boundary between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) in the presence of inductance tolerance, thereby minimizing the mode transition effects and reducing the input current harmonic distortion. The proposed approach is verified by experimental results on a 300 W digitally controlled boost PFC rectifier prototype.

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“…For a long time, analog control has been the conventional control method [2], while many PFC converters have been implemented by digital control recently [3,4], due to the advantages offered by digital control, such as programmability, lower sensitivity to parameter variations, and possibilities to improve performance. However, the performance improvement of digital PFC converter is often limited by relatively complex digital calculation, resulting in unacceptable calculation burden in every switching cycle and digital control latency for the whole control loop [5].…”

Section: Introductionmentioning

confidence: 99%

A new digital predictive control strategy for boost PFC converter

Sun

et al. 2015

IEICE Electron. Express

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A new digital predictive control strategy for a single-phase boost power factor correction (PFC) converter is presented in this paper, to reduce the harmonic distortion and improve the dynamic response. Based on the converter circuit structure, the values of output voltage and inductor current of next switching cycle are predicted in advance. The steady-state algorithm and the dynamic-state algorithm are implemented respectively, the duty cycle is calculated only via the predicted output voltage and inductor current values during the steady process, and the optimized duty cycle is predicted during the dynamic process, to improve the characters of PFC converter. The single-phase boost PFC converter with the proposed digital predictive control strategy has been implemented via the field programmable gate array (FPGA). The experimental results indicate that the proposed digital control strategy can improve the power factor and the dynamic response of PFC converter simultaneously.

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Digital Control for Improved Efficiency and Reduced Harmonic Distortion Over Wide Load Range in Boost PFC Rectifiers

Cited by 116 publications

References 19 publications

On-line efficiency optimization in flyback dc-dc converters over wide ranges of operating conditions

On-line efficiency optimization in flyback dc-dc converters over wide ranges of operating conditions

Accurate mode boundary detection in digitally controlled boost power factor correction rectifiers

A new digital predictive control strategy for boost PFC converter

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