A Peak Current Mode Boost DC-DC Converter with Hybrid Spread Spectrum

Area of Science:

• Electrical Engineering
• Power Electronics
• Microelectronics

Background:

• Stable operation of micromachine systems requires efficient power management via DC-DC converters.
• Switching operations in DC-DC converters generate electromagnetic interference (EMI), potentially disrupting micro-electromechanical systems.
• Existing EMI mitigation techniques may compromise converter efficiency.

Purpose of the Study:

• To propose and evaluate a novel boost converter design for mitigating EMI issues in micromachine systems.
• To implement a Hybrid Spread Spectrum (HSS) technique for effective EMI noise reduction.
• To assess the impact of the HSS technique on converter efficiency.

Main Methods:

• A boost converter utilizing Pulse Width Modulation (PWM) with peak current mode control was designed.
• A Hybrid Spread Spectrum (HSS) technique, combining pseudo-random and triangular periodic spread spectrums, was integrated.
• Simulations were performed using a 0.5 μm Bipolar Complementary Metal-Oxide-Semiconductor Double-diffused Metal-Oxide-Semiconductor (BCD) process.

Main Results:

• The HSS technique effectively reduced EMI around the switching frequency by 12.29 dBμV.
• The proposed converter maintained high efficiency, with a decrease of less than 1% compared to conventional designs.
• The HSS technique utilized a 1.2 MHz pseudo-random spread spectrum and a 9.4 kHz triangular periodic spread spectrum.

Conclusions:

• The proposed boost converter with HSS effectively mitigates EMI noise in micromachine power management.
• The HSS technique offers a viable solution for reducing EMI without substantial efficiency degradation.
• This approach enhances the reliability and operational endurance of micromachine systems.