Real time implementation of a digital controlled boost converter

2014

Several techniques are available for implementing DCDC converters using digital controllers. Some of them are dspace, DSP, FPGA etc. Among these FPGA (Field Programmable Gate Array based implementation provides various advantages in terms of speed, flexibility, low power usage, reduced equipment sizing and massive parallelism. The traditional methods allow fault diagnosis only after the final implementation which leads to extra cost and loss of design time. This paper proposes a smart method of FPGA based implementation of DC-DC Buck Boost converter control system using Matlab and ModelSim. The control algorithm and coding is done by means of VHDL code and implemented using Altera FPGA Board. The FPGA takes control of the entire system and decides whether to increase or decrease the voltage depending on the application. Load is applied and the efficiency is checked at variable load conditions. Also performance comparison is made between a DSP and FPGA to evaluate the effectiveness of both the systems at various operating conditions.

Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005., 2005

This paper investigates the application of a mixed synchronous/asynchronous digital controller to dc-dc boost converters. The digital control synchronously generates current and voltage ramps by using two low-resolution Digital-to-Analog Converters (DACs). Switch turn-on and turn-off are determined asynchronously by comparing converter state variables and the digitally generated current and voltage ramps. The control features high dynamic performance, frequency modulation during transients, no quantization effects, and low-complexity. In order to evaluate the dynamic performance and to compare the proposed solution with conventional analog peak current-mode control, a small signal model of the synchronous/asynchronous modulation is derived. Even if aimed to an integrated digital controller, experimental investigation has been performed using discrete components, implementing the digital control in a Field Programmable Gate Array (FPGA) using a hardware description language (VHDL). Simulation and experimental results on 100 W dc-dc boost converter confirm the proposed analysis and shows that the proposed solution enables dynamic performance comparable to that of analog peak current-mode control.

PWM or Pulse Width Modulation based control of power electronic circuits is the most common method used for controlling the output voltage of boost converters. It involves changing the ton and toff duration of the MOSFET switch at a constant frequency. The paper deals with a controller based on PID control strategy. A low cost micro-controller board, Arduino ,has been used to implement the PWM control technique thus obviating the need for complex hardware circuitry . MATLAB-Simulink was used to design and tune the PID controller parameters as well as to make the Arduino microcontroller a stand-alone device.

This paper explains about the boost converter and control algorithm to reduce harmonics. For the improvement of the functionality of the boost converter there are many methods available among which I consider PI controller in voltage mode control path. Initially I discussed the basic function of the boost converter. Then I derived the transfer function of the complete system. Then I considered model and simulate into matlab without PI controller. Finally I used PI controller in which the values of and has been derived using the Ziegler-nichols method and loop shaping method. At last the output response of the both methods is compared and conclusion made upon that comparison.

Journal of Electrical Systems and Information Technology, 2015

This paper presents detailed open loop and closed loop analysis on boost dc-dc converter for both voltage mode control and current mode control. Here the boost dc-dc converter is a practical converter considering all possible parasitic elements like ESR and on state voltage drops. The open loop control, closed loop current mode control and voltage mode control are verified. The comparative study of all control techniques is presented. The PI compensator for closed loop current mode control is designed using these classical techniques like root locus technique and bode diagram. The simulation results are validated with the experimental results of voltage mode control for both open loop and closed loop control.

Sakarya University Journal of Science, 2016

In this paper, a small signal model for the boost converter is obtained. Two digital controllers using pole placement technique and Linear Quadratic Optimal Regulator (LQR) methods are designed and applied to the boost converter. The compensated system's operations and analysis are discussed and verified through MATLAB/Simulink simulation. Comparison between the two controllers related to the design methodology, implementation issues and transient measured performance is carried out.

IEEE Access

In this paper, a digitally controlled boost DC-DC power converter featuring a high-resolution Dyadic Digital Pulse Width Modulator (DDPWM) is proposed to achieve Limit-Cycle oscillations (LCOs)free operation, high DC accuracy, low output voltage ripple at high switching frequency. The effectiveness of the DDPWM in suppressing the onset of LCOs, increasing DC accuracy, and reducing output ripple is verified by both Simulink/Modelsim co-simulations and experimental testing on a 7-10 V input, 13.8 V output boost converter operated at 1.17 MHz switching frequency. Thanks to the proposed modulator, improvement of more than 6X DC accuracy is achieved compared to a plain digital PWM. Moreover, approximately 3X less output ripple in comparison to a digital PWM with thermometric dithering is achieved. INDEX TERMS Digital pulse width modulator (DPWM), dyadic digital pulse width modulation (DDPWM), digitally controlled boost converter, HDL verilog, limit-cycles oscillations (LCOs), simulink/modelsim co-simulation, switch-mode power converters.

2017

This paper provides design and implementation of a DC-DC boost converter control system by using gain scheduling PI-controller to achieve stable regulated output voltage with improved dynamic performance. The proposed controller parameters are obtained from system output response based on step input signal. A test step input is applied to the system and the three parameters of the plant are obtained from the corresponding response of the plant, which is independent to initial values of the system. Then the PI-controller is designed based on pole-placement method. For improving transient response and rise time of the converter, PI-controller parameters are continuously modified based on gain scheduling method. The efficacy of algorithms is verified through MATLAB simulation and finally, applied proposed algorithms into the DC-DC boost converter. Simulation results are presented to verify the effectiveness of the proposed DC-DC boost converter control system. Keyword: Boost Converter;...

2014

Several techniques are available for implementing DC-DC converters using digital controllers Among these FPGA (Field Programmable Gate Array) based implementation provides various advantages in terms of speed, flexibility, low power usage, reduced equipment sizing and massive parallelism. The traditional methods allow fault diagnosis only after the final implementation which leads to extra cost and loss of design time. This paper proposes a smart method of FPGA based implementation of DC-DC Buck Boost converter control system using Matlab and ModelSim. The control algorithm and coding is done by means of Verilog code and implemented on an Altera FPGA Board. The FPGA takes control of the entire system and decides whether to increase or decrease the voltage depending on the application. Load is applied and the efficiency is checked at variable load conditions.