SPVA030 August   2025 TPS4141-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2HV Measurement
    1. 2.1 Safety
    2. 2.2 Reliability
    3. 2.3 Scalability/Size
    4. 2.4 The Problem with Discrete Designs
    5. 2.5 Integrated Designs
    6. 2.6 TPS4141-Q1
    7. 2.7 RES60A-Q1
  6. 3Summary
  7. 4References

2 HV Measurement

HV measurement is used to measure high-voltages at numerous places in a BMS as shown in Figure 2-1. This is not exhaustive, as HV measurements are needed at various points to safeguard essential components of the BMS.

High Voltage Measurement Points in a BMS Figure 2-1 High Voltage Measurement Points in a BMS

To accurately perform HV measurements, an analog-to-digital converter (ADC) is necessary to sample and communicate the resulting voltage to the rest of the system. However, the input to an ADC must usually not exceed 5V. To achieve this, resistor dividers are commonly used to reduce the high-voltage signal into a proportionally lower voltage. The range of this low-voltage signal is determined by the ratio of the resistor values and the high-voltage input ranges to be supported. Once the low-voltage signal is acquired and the resistor ratio is known, this is easy to calculate the high-voltage input.