I am designing a power supply using a buck regulator and a boost converter or two buck regulators together, and feeding them from a single (1S 3.7V) battery or a double (2S 7.4V) LiPo battery pack. The goal is power up a 3.3V MCU (i.e. ESP32 or Arduino) and one or two motors via a motor driver.
Here I have 4 different options depending on the single or double cell LiPo batteries and also depending whether to use 6 or 12 volts motor(s). But my design has to work with all 4 options. Assume we are using a BMS (for the safety and power management of the LiPo battery) that could draw sufficient power from the LiPo to run both MCU and Motors.
Questions:
Preface: First notice, in option 1, 2 and 4, we are feeding a buck regulator and a boost converter from a 1S or 2S LiPo cell(s). And in option 3, we are feeding two buck regulators from a 2S LiPo pack.
Here are the 4 options (see circuits below):
Here I have 4 different options depending on the single or double cell LiPo batteries and also depending whether to use 6 or 12 volts motor(s). But my design has to work with all 4 options. Assume we are using a BMS (for the safety and power management of the LiPo battery) that could draw sufficient power from the LiPo to run both MCU and Motors.
Questions:
Preface: First notice, in option 1, 2 and 4, we are feeding a buck regulator and a boost converter from a 1S or 2S LiPo cell(s). And in option 3, we are feeding two buck regulators from a 2S LiPo pack.
- Is there going to be any issue for feeding a buck and a boost converter from the same source (i.e. the same battery)?
- Since the buck/boost converters run on a specific frequency, will it cause any issue if the frequency of one doesn't match with another?
- Efficiency is one of the major concerns, because we are using a battery here. Do you have any suggestion? Do you have any better design idea?
Here are the 4 options (see circuits below):