DESIGN AND CONTROL OF HIGH VOLTAGE DC-DC POWER CONVERTER SYSTEM
Dc-Dc converters with steep voltage ratio are usually required in many industrial applications. For examples, the front-end stage for clean-energy sources, the dc back-up energy system for an uninterruptible power supply (UPS), high-intensity discharge lamps for automobile headlamps, and telecommuni
2025-06-28 16:31:18 - Adil Khan
DESIGN AND CONTROL OF HIGH VOLTAGE DC-DC POWER CONVERTER SYSTEM
Project Area of Specialization RoboticsProject SummaryDc-Dc converters with steep voltage ratio are usually required in many industrial applications. For examples, the front-end stage for clean-energy sources, the dc back-up energy system for an uninterruptible power supply (UPS), high-intensity discharge lamps for automobile headlamps, and telecommunication industry.
The conventional boost converters cannot provide such a high dc voltage ratio due to the losses associated with the inductor, filter capacitor, switch and output diode. Even for an extreme duty cycle, it will result in serious reverse-recovery problems and increase the rating of the output diode. As a result, the conversion efficiency is degraded and the electromagnetic interference (EMI) problem is severe under this situation.
In order to increase the conversion efficiency and voltage gain many modified boost converter topologies have been investigated in the past decade. Voltage-clamped techniques are manipulated in the converter design to overcome the severe reverse-recovery problem of the output diode in high-level voltage applications, overlarge switch voltage stresses remain and the voltage gain is limited by the turn-on time of the auxiliary switch.
A high step-up converter with coupled inductor boost converter is proposed. The circuit
topology of the proposed converter is derived from conventional boost converter with coupled inductor connection such that high step-up voltage gain with proper duty ratio is achieved. Besides, the coupled-inductor technique concept also can be adopted to construct other step-up converters. The operating principle, steady-state analysis, and efficiency analysis are presented. Finally, an experimental prototype with 12 V input and 150 V output is implemented to verify the theoretical analysis.
To develop a high-efficiency dc-dc converter with high voltage gain and reduced switch stress. The utilization of a coupled inductor is useful for raising the step-up ratio of the conventional boost converter. The switch surge voltage may be caused by the leakage inductor so that it will result in the requirement of high-voltage-rated devices. In the proposed topology, a three-winding coupled inductor will used for providing a high voltage gain without extreme switch duty cycle and enhancing the utility rate of magnetic core. Moreover, the energy in the leakage inductor will released directly to the output terminal for avoiding the phenomenon of circulating current and the production of switch surge voltage. In addition, the delay time formed with the cross of primary and secondary currents of the coupled inductor will manipulated to alleviate the reverse-recovery current of the output diode. It can achieve the aim of high-efficiency
power conversion. Furthermore, the closed-loop control methodology will utilize in the proposed scheme to overcome the voltage drift problem of the power source under the variation of loads.
- Study of different research papers and collect data for dc-dc converters with steep voltage ratio are usually required in many industrial applications. The front-end stage for clean-energy sources, the dc back-up energy system for an uninterruptible power supply (UPS), high-intensity discharge lamps for automobile headlamps, and telecommunication industry
- Mathematical Modeling of system of the proposed converter topology. It contains eight parts including a DC input circuit, a primary-side circuit, a secondary-side circuit, a clamped circuit, an auxiliary circuit, a filter circuit, a DC output circuit and a feedback control mechanism.
- Control system Design is very important for the project; the voltage drift problem of the power source under the variation of loads can be copied by the closed-loop control methodology.
- At the end we will combine all the parts and have a final product in display
A high-efficiency dc-dc converter with high voltage gain and reduced switch stress, and this converter have been applied well for a PEMFC system with the power quality of low voltage as well as high current. The maximum efficiency will l be over 95%, which is comparatively higher than conventional converter with the same voltage gain. The newly designed converter circuit has the following improvement compared to the previous works.
1).It can select the switch with lower sustainable voltage for alleviating the switch Conduction loss
2) The reverse-recovery problem can be solved by the manipulation of the delay time formed with the cross of primary and secondary currents of the coupled inductor.
3) The output diode in this circuit topology can be selected as Scotty diode with the reduction of switching and conduction losses.
4) The voltage drift problem of the power source under the variation of loads can be copied by the closed-loop control methodology.
This high-efficiency converter topology provides designers with an alternative choice to convert renewable energy efficiently, and it also can be extended easily to other power conversion systems for satisfying high-voltage demands.
Technical Details of Final DeliverableA high-efficiency converter with high voltage gain applied to a step-up power conversion is presented. In the proposed strategy, a high magnetizing current charges the primary winding of the coupled inductor, and the clamped capacitor is discharged. To the auxiliary capacitor when the switch is turned on. In contrast, the magnetizing current flows continuously to boost the voltage in the secondary winding of the coupled inductor, and the voltages across the secondary winding of the coupled inductor, the clamped capacitor and the auxiliary capacitor are connected in series to charge the output circuit. Thus, the related voltage gain is higher than in conventional converter circuits. Moreover, this scheme has soft-switching and voltage-clamped properties, i.e. the switch is turned on under zero-current switching and its sustainable voltage is comparatively lower than the output voltage, so that it can select low-voltage low-conduction-loss devices and there are no reverse-recovery currents within the diodes in this circuit. In addition, closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the load variations. As a result, the proposed converter topology can promote the voltage gain for a conventional boost converter with a single inductor, and deal with the problem of the leakage inductor.
Final Deliverable of the Project Hardware SystemType of Industry Others Technologies OthersSustainable Development Goals Industry, Innovation and InfrastructureRequired Resources| Item Name | Type | No. of Units | Per Unit Cost (in Rs) | Total (in Rs) |
|---|---|---|---|---|
| Total in (Rs) | 76000 | |||
| Hardware frame | Equipment | 2 | 8000 | 16000 |
| Transistors, Diodes, Inductors, Capacitor | Equipment | 4 | 5000 | 20000 |
| comparator | Equipment | 3 | 3000 | 9000 |
| Microcontroller | Equipment | 3 | 5000 | 15000 |
| 12v cells | Equipment | 3 | 500 | 1500 |
| basic circuit components including buttons, wires | Equipment | 3 | 1500 | 4500 |
| stationary and printouts | Miscellaneous | 1 | 5000 | 5000 |
| other | Miscellaneous | 1 | 5000 | 5000 |