Control method for improving the response of single‐phase continuous conduction mode boost power factor correction converter

Hysteretic comparators are often used to implement sliding-mode controllers or other type of discontinuous regulators for power switching converters. Their design is usually performed analogically yielding robust and fast controllers that can even allow converter operation with high values of duty cycle. A new analogue implementation based on a low-cost microcontroller is described in this study showing the mentioned advantages plus the flexibility of a programmable digital system. The proposed comparator employs some microcontroller peripherals without consuming execution time of the control algorithm and without requiring interruption management. It provides variable hysteresis width to obtain constant switching frequency in sliding-mode strategies and can be used in any type of hard switching converter. The dynamic performance of the method is verified experimentally in a boost converter-based rectifier with power factor correction and output voltage regulation in one single stage. The boost converter operates in sliding mode with constant switching frequency and results in a total harmonic distortion of the input current <1%.

Section: Analysis Of the Proposed Examplementioning

confidence: 99%

Using low‐cost microcontrollers to implement variable hysteresis‐width comparators for switching power converters

Bosque-Moncusí

Valderrama-Blavi

Flores‐Bahamonde

et al. 2018

“…Tremendous conduction losses occur while using DBR [3,7,8]. Therefore, researchers pay attention towards bridgeless AC-DC converter topologies to minimise conduction losses and number of passive components in the power circuit [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The main drawback associated with boost type PFC DC–DC converter is the generation of higher output voltage with respect to applied voltage [2, 3]. Due to the flow of high ripple current through power devices in each current flow cycle, poor efficiency is obtained.…”

Section: Introductionmentioning

confidence: 99%

Design and development of single phase AC–DC discontinuous conduction mode modified bridgeless positive output Luo converter for power quality improvement

Gnanavadivel¹,

Yogalakshmi²,

Kumar³

et al. 2019

Power factor corrected AC-DC converter topologies have been of research interest for DC power supplies. The main goal of this work is to improve power quality at the supply side and maintain constant DC voltage at the output side by designing a Modified Bridge Less Positive Output Luo (MBLPOL) power factor correction (PFC) converter. Discontinuous conduction mode is also possible for input PFC with a small filter at the source side. In order to regulate the DC load voltage for various loads and supply voltage conditions, a feedback control circuit with a single voltage sensor is proposed for the PFC converter. A prototype of 100 W, 48 V, AC-DC MBLPOL converter is designed and tested. Proper design of controller for the converter guarantees the excellent performance and the same is validated with the help of simulation and hardware results. The proposed MBLPOL converter is tested for DC load voltage regulation for various load power and supply voltage variations. The experimental study shows supply current total harmonic distortion of 1.24% at rated load while maintaining unity power factor.

“…Control methods are proposed in [3,4,[13][14][15][16][17][18][19][20][21][22][23][24][25] to nullify the effects of the double-line frequency ripple component. Load current feedforward based control techniques for dynamic performance improvement are employed in [13,14] where the load current is sensed and given as a feedforward to the control loop.…”

Section: Introductionmentioning

confidence: 99%

“…In ripple estimation and cancellation techniques [3][4][5][6][23][24][25], the output voltage ripple is estimated based on a template and subtracted from the sensed output voltage signal to obtain the ripple free average sensed voltage. A ripple cancellation method by sampling the output voltage 90° shifted to obtain the peak value of the output voltage is presented in [23].…”

Section: Introductionmentioning

confidence: 99%

Simple digital algorithm for improved performance in a boost PFC converter operating in CCM

Nair¹,

Narasamma²

2019

In power factor correction (PFC) converters, achieving both good steady-state input current waveform and fast output dynamic response is a challenge. This is due to the effect of the double-line frequency ripple present in the sensed output voltage signal which tends to distort the reference current applied to the current controller, thus leading to a distorted input current waveform. Low bandwidth (BW) voltage loop designs to reduce this input current distortion make the output dynamic response very sluggish. A digital control algorithm for the estimation of the average value of the sensed output voltage is proposed in this study to achieve low total harmonic distortion input current and fast dynamic response with a higher BW voltage loop. The proposed algorithm is computationally less intensive and requires no additional sensors or circuitry. The effectiveness of the proposed control algorithm is validated through simulation and experimental tests on a 300 W boost PFC converter prototype operating in continuous conduction mode.