In the past, there was no power value display when the phone was fully charged, we judged how much power the phone had left by reducing the green bar above the phone, but this value was not accurate, until there was a 100% digital power display next to the green bar of the mobile phone, and we accurately understood how much power the phone had left. In the technical upgrade of mobile phones from scratch, electric energy metering chips play an important role.
The electric energy metering chip is an MCU used in digital electric energy metering of electronic products, which can realize the functions of electric energy metering, storage and transmission. The principle of the electricity metering chip is mainly to calculate the consumption of electricity through the acquisition and processing of current and voltage signals combined with power factors, frequency and other parameters. It is mostly used in the fields of inflatable pumps, intelligent electrical appliances and energy management systems.
The core component of the energy metering chip is an integrated circuit chip, which contains a current sampling circuit, a voltage sampling circuit, a computing circuit and a memory. The current sensing circuit converts the current signal into a voltage signal through a current transformer or current transformer, and then amplifies the voltage signal to a range suitable for chip processing through an amplification circuit. The voltage sampling circuit directly collects the voltage signal and amplifies it to a range suitable for chip processing. For example, Xinhai's CSE7761 single-phase multi-function energy metering chip integrates 3 SIGMA-Delta ADCs, power calculators, energy-frequency converters, SPI interfaces, UART interfaces and other functional parameters.
The computing circuit is the core part of the energy metering chip, which calculates the consumption of electric energy by sampling and processing current and voltage signals. The calculation circuit usually uses digital signal processing technology to convert the sampled current and voltage signals into digital signals, and perform mathematical calculations to finally obtain the consumption of electric energy. The calculation circuit can also realize a variety of electric energy metering functions, such as the calculation of active power, reactive power, power factor, etc. The CSE7761 is a high-performance power measurement application that accurately calculates RMS, RMS, active power, apparent power, and power factorIt provides high-speed waveform data of voltage and current and instantaneous data of voltage rms, current rms, active power and apparent power, provides 2 channels of active energy metering, and can provide power factor, phase angle, voltage overvoltage, current overcurrent, active power overload, voltage undervoltage, voltage line frequency, voltage zero crossing, current zero crossing and peak peak and other parameters or indication signal output.
The memory is another important part of the energy metering chip, which is used to store the metering data of electric energy. Memory is usually non-volatile such as flash memory or EEPROM, which can guarantee long-term data retention. The memory can also realize the function of reading and transmitting data, which is convenient for users to view and manage the data, and the electric energy metering chip is a combination of integrated circuit technology and electric energy metering principle, which can realize the functions of electric energy metering, storage and transmission.
With the rapid development of the electric energy industry, the electric energy metering chip has also ushered in its development period. At present, there are many mature electric energy metering chip manufacturers in China, they have independent intellectual property rights and research and development capabilities, such as Xinhai, China Resources Micro, SMIC, etc., the rise of domestic chips is not an empty slogan, and the peak of the semiconductor industry is in our efforts to climb.