The battery control unit (BCU) is responsible for calculating the battery states, running the BMS housekeeping, and communicating with the domain controller.
The BCU consists mainly of the master controller and all the supplementary interfaces:
- Power management IC
- Communication interface to the domain controller
- Isolated communication transceivers/receivers with the monitoring units
- Memory for storing all the battery logs and history
The BMS software runs on the BCU and is responsible for:
- Driving all the monitoring units
- Collecting all the monitored values
- Calculating the various states of the battery (SoX), such as State of Charge (SoC), State of Health (SoH),
- State of Power (SoP), and State of Safety (SoS)
- Performing housekeeping
- Updating the BMS firmware
Infineon offers a wide portfolio of controllers catered to different needs of the automotive applications
In BMS two set of products stand out:
- The TRAVEO™ family-supporting BMS applications with up to ASIL-B functional safety requirements
- The AURIX™ family-supporting BMS application with up to ASIL-D functional safety requirements
In battery management systems, a compact and reliable solution that powers the entire system is required. Several components can be integrated, extreme battery voltage fluctuations are managed and requirements of the latest network interfaces and automotive security are met with Infineon‘s portfolio of Power Management ICs (PMICs).
The PMICs support comprehensive power supplies with a small form factor footprint for system solutions using Traveo™, AURIX™, and PSoC™ MCU families. Boost function integrated into the PMICs avoids system blackout under extreme battery voltage fluctuations. The low quiescent current of the PMICs reduces the standby current of always-on functions. The PMICs comply with AEC-Q100, and extensive system safety functions help to comply with modern vehicle ECU requirements.
OPTIREG™ PMIC family is the recommended choice for BMS.
OPTIREG™ PMIC products are providing integrated, multi-rail power supply solutions for safety-relevant applications. The family is offering high efficient voltage regulation including pre-and post-regulator architectures with DCDC-, linear, and tracking regulators. Besides the power supply, additional monitor- and supervision features and functions are integrated.
- OPTIREG™ PMIC TLF35584QVVS1 is a multiple output system supply for 5V -μC, transceivers, and sensors. The wide switching frequency range allows optimization in respect of efficiency and usage of small filter components. A dedicated reference regulator supplies the ADC independent from μC-load steps and acts as a tracking source for the 2 independent sensor supplies.
- OPTIREG™ PMIC TLF35584QVVS2 is a multiple output system supply for 3.3V -μC, transceivers, and sensors. The wide switching frequency range allows optimization in respect of efficiency and usage of small filter components. A dedicated reference regulator supplies the ADC independent from μC-load steps and acts as a tracking source for the 2 independent sensor supplies.
- OPTIREG™ PMIC TLF11251LD is an integrated half-bridge capable of 2.5A enabling the usage of OPTIREG™ PMIC TLF35584 with high-end 2nd generation TriCore™ AURIX™ 32-bit microcontrollers TC38x/TC39x.
Check out the OPTIREG™ switcher simulation tool to calculate efficiency and stability!
Discover also the other PMICs available at Infineon:
- S6BP20x series (S6BP201A, S6BP202A, and S6BP203A) PMICs are one-channel buck-boost DC/DC converters for automotive and industrial applications.
- S6BP501A and S6BP502A PMICs are 3-channel output power management ICs (PMICs). They come with a buck controller and a buck converter, as well as a boost converter, offering a single chip 5.0V, 3.3V, and 1.2V power source. These PMICs have quiescent current as low as 15μA
- S6BP401A PMIC is a single-chip power management solution that has 6-channel power output. It includes a 4-channel DC/DC converter and 2-channel LDO. Integrating output impedance setting and phase compensation circuits internally for all channels, the S6BP401A reduces the PCB size and bill of materials.
The communication devices enable the BCU to communicate with the domain controller. Infineon offers a set of CAN & LIN transceivers that caters to the BCUs requirements. For more details visit our automotive transceiver page.
All monitored values (such as the various voltages, temperatures, and currents) need to be transmitted to the main controller, which takes care of the state calculations and housekeeping. However, in some cases, the monitoring devices must be isolated from the controller. Learn more about Infineon's different isolation methods and solutions.
- Get to know how AURIXTM is able to answer the needs of the electric vehicle market
- Recognize and explore how AURIX™ TC3xx addresses key electric vehicle challenges, and understand the main features of the AURIX™ TC3xx microcontroller