Specialized three-phase and DC energy metering chips for electrical measuring instruments

metering

◆AC and DC metering

◆Provide full wave and fundamental active energy, with a dynamic range of 5000:1 and a nonlinear error of<0.1%, meeting the accuracy requirements of 0.5S and 0.2S active energy meters

◆Provide full wave, fundamental RMS, PQS apparent electrical energy

◆Provide active and reactive power directions, support reactive four quadrant judgment

◆Equipped with stealth start function and adjustable start threshold

◆Adjustable electric meter constant

◆Provide fast pulse counting for active, reactive, and visible power

◆Provide 3 output parameters with configurable pulse output

measure

◆Provide effective values of full wave, fundamental wave, and harmonic three-phase voltage and current, with a measurement error of less than 0.2% within a dynamic range of 2000:1

◆Provide full wave, fundamental active, reactive, RMS, and PQS apparent power, with a dynamic range of 2000:1 and a measurement error of<0.1%

◆Provide full wave and fundamental power factors with measurement error<0.2%

◆Provide voltage line frequency, measurement error<0.02%

◆Provide 6 phase angles with measurement error<0.02 °

◆Provide 7 channels of ADC instantaneous sampling data, with a typical application downsampling rate of 8KHz

◆Provide flexible ADC synchronous sampling data cache, 768x24bit, 64 or 128 points per cycle, for easy harmonic analysis

◆Provide voltage vector and effective value, 2 types of current vector and effective value

◆Provide 7 zero crossing detections, with zero crossing threshold adjustable

◆Provide voltage phase sequence error detection

◆Provide pressure loss indication, and the pressure loss threshold can be set

◆Provide voltage sag detection

◆Provide overvoltage and overcurrent detection

◆Provide software libraries for power quality parameters such as harmonics, three-phase imbalance, flicker and voltage fluctuations, voltage surges and dips, voltage interruptions, etc

software regulating meter

◆Provide gain correction for 7 ADC channels

◆Provide phase correction for 7 ADC channels, among which A, B, and C current channels support segmented phase correction

◆Provide power gain correction

◆Provide segmented phase correction for active and reactive power

◆Provide active, reactive, and effective value offset correction

◆Provide automatic DC offset correction function

◆Provide checksum registers for automatic verification of calibration table data

◆Suitable for three-phase three wire and three-phase four wire systems

◆+3.3V power supply with power monitoring function

◆Built in 1.25V ± 1% reference voltage, typical temperature coefficient of 5ppm/℃, maximum 15ppm/℃, can also be connected to an external reference voltage

◆Equipped with a high-speed SPI interface, the transmission rate can reach 3.5Mbps, and it provides write protection function

◆Having an interrupt output pin

◆Working voltage range: 3.0V-3.6V

◆Working temperature range: -40 ℃ -85 ℃

◆Adopting LQFP32 green packaging

◆RN7302 is a multifunctional high-precision three-phase metering dedicated chip, suitable for three-phase four wire and three-phase three wire applications.

◆RN7302 integrates 7 channels of ∑ - Δ ADC, reference voltage, digital signal processing and other circuits, which can measure the active, reactive, PQS and RMS apparent power and electrical energy of each phase and combined phase, and provide 7 channels of effective value, voltage current vector and effective value, 6 channels of phase angle, power factor, voltage line frequency, zero crossing detection, voltage phase sequence detection and other parameters.

◆RN7302 provides a complete set of fundamental wave parameters and harmonic effective values.

◆RN7302 supports multiple software calibration methods, including pulse calibration, power calibration, and vector sum calibration.

◆RN7302 provides flexible ADC synchronous sampling data caching for harmonic analysis.

◆RN7302 provides a software library for power quality parameters such as harmonics, three-phase imbalance, voltage flicker and fluctuation, voltage sudden rise and fall, and voltage interruption.

◆RN7302 provides SPI interface.

◆The internal power monitoring circuit of RN7302 can ensure the reliable operation of the chip during power on and off.

◆The RN7302 can be integrated with the RuiNeng Micro SOCRN721X to meet the design of intelligent electrical measuring instruments such as high-performance three-phase multifunctional meters, multi rate meters, harmonic meters, residual current fire detectors, etc. It can also be paired with high-speed CPUs to achieve multifunctional instruments with power quality analysis functions.