Abstract
To balance the cost and volume when applying a low output current ripple, the power supply design should be able to eliminate the current ripple under any duty cycle in medium and high switching frequencies, and considerably reduce filter volume to improve power density. A stacked buck converter was eventually selected after reviewing the existing solutions and discussing their advantages and disadvantages. A stacked buck converter is used as a basis to propose the transient response and output current ripple elimination effect, boundary limit control method, and low output ripple dead time modulation method to make individual improvements. The principle, mathematical derivation, small-signal model, and compensator design method of the improvement method are presented in detail. Moreover, simulation results are used to mutually verify the correctness and effectiveness of the improvement method. A stacked buck converter with 330-V input, 50-V output, and 1-kW output power was implemented to verify the effect of the low output current ripple dead time modulation. Experimental results showed that the peak-to-peak value of the output current ripple was reduced from 2.09 A to 559 mA, and the RMS value was reduced from 551 mA to 91 mA, thereby effectively improving the output current ripple.
Highlights
With the development of technology, batteries have been extensively used in daily life
On the basis of the preceding literature discussion, this study proposes a low output ripple dead time modulation and boundary limit control methods to improve the stacked buck converter’s output current ripple elimination effect and increase the transient response
RCcompensator delay control, this study proposes a boundary limit control method suitable for stacked buck converters
Summary
With the development of technology, batteries have been extensively used in daily life. Apart from preventing overcharge and over-discharge of batteries, BMS diagnoses and analyzes battery life and health status by recording batteryrelated data and residual capacity to optimize their overall performance. One of the standard test methods for batteries’ usable capacity is the coulomb measurement method [10,11]. This method is used to calculate the current value flowing into or out of batteries and integrates the current value over time to determine the number of coulombs flowing through. This method can accurately estimate the available battery capacity. The current ripple elimination mechanism is important to prevent the output current ripple from causing measurement errors and reduce the volume of the output capacitor to increase power density
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