High-Frequency Inverter System Design
Budget: $30 – $250 USD
Inverter System (Battery-Powered, 297 V DC Input)
This inverter is designed to power an induction furnace intended to melt 1 kg of zinc using electromagnetic induction. The system receives 297 V DC directly from a battery source, eliminating the need for rectification stages. The inverter’s role is to convert this DC input into a high-frequency (50 kHz) AC signal that drives an LC resonant tank connected to an induction coil.
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Key Parameters and Operation:
• Input Voltage:
The inverter operates from a 297 V DC battery. This voltage defines the peak voltage of the AC waveform produced after the full-bridge switching stage.
• Input Power Requirement:
The total input power required is approximately 1.3 kW, accounting for both useful output power and system losses (e.g., switching losses, I²R losses, magnetic losses).
• Output Power (Useful Thermal Power):
The system is designed to deliver approximately 887 W of useful thermal power to the zinc, which is sufficient to melt 1 kg based on its heat and phase change properties.
• Estimated Output Current:
Using the input power to estimate current:
I = \frac{P}{V} = \frac{1300\,\text{W}}{297\,\text{V}} \approx 4.38\,\text{A}
Therefore, the inverter system is designed to provide up to 4.5 A continuously through the coil and resonant tank.
• Switching & Control:
The inverter uses IGBTs in a full-bridge configuration, driven by Sinusoidal PWM (SPWM) generated from a microcontroller (e.g., Arduino).
SPWM enables precise waveform shaping at 50 kHz, aligned with the resonant frequency of the LC tank.
Proper dead-time management, gate driver isolation, and cooling measures are implemented for safe and efficient operation.
• LC Resonant Tank:
The inverter output connects to a resonant LC circuit tuned to 50 kHz using:
f = \frac{1}{2\pi\sqrt{LC}} = 50{,}000\,\text{Hz}
The values of L (coil inductance) and C (capacitor) are selected based on zinc’s thermal requirements and to achieve maximum power transfer at resonance.
• Load Characteristics:
The induction coil magnetically couples energy into the zinc for resistive heating.
The coil is designed to have low resistance to reduce I²R losses, while generating a strong magnetic field to heat the metal efficiently.
⸻
Implementation Notes:
• The entire system is being simulated using Proteus.
• Arduino IDE is used for developing and uploading the SPWM code to the microcontroller.
• Estimated completion time: maximum of 2 days.
• Please do not attempt to bid if you lack experience in:
• Power electronics
• SPWM control
• Proteus simulation environment
This inverter is designed to power an induction furnace intended to melt 1 kg of zinc using electromagnetic induction. The system receives 297 V DC directly from a battery source, eliminating the need for rectification stages. The inverter’s role is to convert this DC input into a high-frequency (50 kHz) AC signal that drives an LC resonant tank connected to an induction coil.
⸻
Key Parameters and Operation:
• Input Voltage:
The inverter operates from a 297 V DC battery. This voltage defines the peak voltage of the AC waveform produced after the full-bridge switching stage.
• Input Power Requirement:
The total input power required is approximately 1.3 kW, accounting for both useful output power and system losses (e.g., switching losses, I²R losses, magnetic losses).
• Output Power (Useful Thermal Power):
The system is designed to deliver approximately 887 W of useful thermal power to the zinc, which is sufficient to melt 1 kg based on its heat and phase change properties.
• Estimated Output Current:
Using the input power to estimate current:
I = \frac{P}{V} = \frac{1300\,\text{W}}{297\,\text{V}} \approx 4.38\,\text{A}
Therefore, the inverter system is designed to provide up to 4.5 A continuously through the coil and resonant tank.
• Switching & Control:
The inverter uses IGBTs in a full-bridge configuration, driven by Sinusoidal PWM (SPWM) generated from a microcontroller (e.g., Arduino).
SPWM enables precise waveform shaping at 50 kHz, aligned with the resonant frequency of the LC tank.
Proper dead-time management, gate driver isolation, and cooling measures are implemented for safe and efficient operation.
• LC Resonant Tank:
The inverter output connects to a resonant LC circuit tuned to 50 kHz using:
f = \frac{1}{2\pi\sqrt{LC}} = 50{,}000\,\text{Hz}
The values of L (coil inductance) and C (capacitor) are selected based on zinc’s thermal requirements and to achieve maximum power transfer at resonance.
• Load Characteristics:
The induction coil magnetically couples energy into the zinc for resistive heating.
The coil is designed to have low resistance to reduce I²R losses, while generating a strong magnetic field to heat the metal efficiently.
⸻
Implementation Notes:
• The entire system is being simulated using Proteus.
• Arduino IDE is used for developing and uploading the SPWM code to the microcontroller.
• Estimated completion time: maximum of 2 days.
• Please do not attempt to bid if you lack experience in:
• Power electronics
• SPWM control
• Proteus simulation environment