One-phase shunt electricity meter reference design using standalone ADCs
Description
This reference design implements Class 0.5 single-phase energy measurement using standalone multi-channel analog-to-digital converters (ADC) to sample a shunt current sensor. With the combination of the shunt sensor and a compact magnetically immune power supply: the design provides protection against magnetic tampering attacks. The design also provides the capability to detect potential tampering from neutral line disconnection. The combination of a high-performance ARM Cortex-M4 MCU to execute the metrology calculations and 8-kHz sampling rate allows the addition of power quality functions: such as individual harmonic analysis.
Features
- Class 0.5 single-phase metrology tested across 50-mA to 90-A input rangeCalculated parameters include active and reactive energy and power: RMS line current: RMS neutral current: RMS voltage: power factor: and line frequencyDetects potential tamper attacks with low-power current detection modeCompact non-magnetic power supply using active clamped capacitor-drop regulator with power good indication and supply failure alertsRS-485 and RS-232 interfaces with 5kV RMS isolationComplete: tested reference design with hardware files and design guide
Applications
- Electricity meter
- Digital multimeter (DMM)
Product Categories
- Data converters