Three-Phase Bidirectional Integrated Meter Using Hall Effect Sensor in 0.5um CMOS Process

This paper presents an integrated circuit (IC) with a new structure designed for digital meters. This innovative design improves the measurement accuracy of the digital meter while reducing power consumption. The adoption of this new structure has resulted in a decrease in the overall cost of the digital meter. To reduce power consumption, the two-watt meter method was implemented instead of the three-watt meter method. In the next step, power consumption was further minimized by removing the current transformer and using a Hall effect sensor for current measurement. The use of a Hall effect sensor in place of the current transformer contributed to a reduction in the cost of the digital meter. Additionally, employing the two-watt meter method reduced the number of Hall effect sensors from three to two, further lowering the cost. The IC is designed to be bidirectional, allowing the meter to distinguish between a generator and a consumer, and to calculate the amounts of generation and consumption. Due to its unique design, the IC is capable of measuring both alternating current (AC) and direct current (DC). One application of the IC includes measuring direct current in synchronous motors at power plants.