Power losses and efficiency of buck pwm DC-DC power converter

Summary In this paper, a new topology of the cascaded asymmetrical multilevel inverter (CAMI) has been presented. In the output voltage of the CAMI, a high number of levels are required to reduce the total harmonic distortion (THD). To increase the number of levels, more auxiliary H‐bridges are required to connect with the MAIN H‐bridge of the CAMI, which increases the number of components, cost, and space for installation. To solve this problem, a low‐rating buck converter is connected with one of the auxiliary bridge. With this modification, any number of levels can be achieved in the output voltage with lesser number of circuit components. To show the ability of the proposed variable voltage CAMI, it is compared with existing cascaded multilevel inverter topologies in terms of number of semiconductor devices, the number of DC sources, variety of DC sources, total standing voltage, the number of semiconductor devices in the current path, efficiency, and THD. In this paper, simulation of the proposed topology with nearest level control modulation has been performed using MATLAB/SIMULINK environment. The output voltage, load current, power factor, power, and THD have been obtained by simulation of 21‐level variable voltage CAMI and are validated by experiment results under a resistive and motor load. Hardware implementation has been done by compiling nearest level control modulation into dSPACE DS1104 R&D controller board.

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“…The conduction losses of IGBT and diode of BC have been calculated by Equations , , and

P_{c, italicBC, italicIGBT} = ((), i^{2} R_{IGBT}) δ_{n},

P_{c, italicBC, D} = ((), i^{2} R_{D}) ((), 1 - δ_{n}),

P_{c, italicBC} = P_{c, italicBC, italicIGBT} + P_{c, italicBC, D},

Total conduction losses of VVCAMI, P_{c} = P_{c, italicBC} + P_{con},

Total power losses of VVCAMI, P_{loss} = P_{c} + P_{switch} .

…”

Section: Power Losses Analysis Of Vvcamimentioning

confidence: 99%

Buck converter-based cascaded asymmetrical multilevel inverter with reduced components

Singh

Dahiya

Saini

2017

Int Trans Electr Energ Syst

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“…The buck converter is a simple step down DC-DC converter that is capable of having very high efficiency (70%-95%) [8].…”

Section: B Buck Convertermentioning

confidence: 99%

Comparison of linear and nonlinear buck converter models with varying compensator gain values for design optimization

Sattler

Lui

Edrington

2010

North American Power Symposium 2010

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Nonlinear phenomena in a closed-loop pulse-width modulated (PWM) buck converter are analyzed. We show three different methods to model the buck converter: a linearized small-signal model, a nonlinear model with a stiff source, and a nonlinear model with a rectified grid source. Using three different compensator gain values that were specifically chosen from a bifurcation diagram, the step responses of the three buck converter models are compared. With the ultimate goal of optimizing the design process of switching converters, the nonlinear dynamics of switching converters is studied using simulation models built in MATLAB/Simulink/PLECS.

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“…Among different parameters of the converters, power loss and efficiency have received a great deal of attention (see, e.g., [13], [17]). The circuit diagram of a buck converter is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

A High-Efficiency, Auto Mode-Hop, Variable-Voltage, Ripple Control Buck Converter

Rokhsat-Yazdi¹,

Afzali-Kusha²,

Pedram³

2010

Journal of Power Electronics

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In this paper, a simple yet efficient auto mode-hop ripple control structure for buck converters with light load operation enhancement is proposed. The converter, which operates under a wide range of input and output voltages, makes use of a statedependent hysteretic comparator. Depending on the output current, the converter automatically changes the operating mode. This improves the efficiency and reduces the output voltage ripple for a wide range of output currents for given input and output voltages. The sensitivity of the output voltage to the circuit elements is less than 14%, which is seven times lower than that for conventional converters. To assess the efficiency of the proposed converter, it is designed and implemented with commercially available components. The converter provides an output voltage in the range of 0.9V to 31V for load currents of up to 3A when the input voltage is in the range of 5V to 32V. Analytical design expressions which model the operation of the converter are also presented. This circuit can be implemented easily in a single chip with an external inductor and capacitor for both fixed and variable output voltage applications.

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Power losses and efficiency of buck pwm DC-DC power converter

Cited by 13 publications

References 0 publications

Buck converter-based cascaded asymmetrical multilevel inverter with reduced components

Buck converter-based cascaded asymmetrical multilevel inverter with reduced components

Comparison of linear and nonlinear buck converter models with varying compensator gain values for design optimization

A High-Efficiency, Auto Mode-Hop, Variable-Voltage, Ripple Control Buck Converter

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