Smart energy metering chip helps IoT development
In the era of the Internet of Things, many companies have intelligently transformed traditional products. Heli has been focusing on the field of electric energy measurement and providing solutions for intelligent electric appliances. The previously introduced HLW8012/HLW8032 has the advantages of small size, simple peripheral and high reliability. It has been widely used in smart sockets, charging piles, Intelligent street lights and other fields. Today, two new energy metering chips HLW8112 and HLW8110 are introduced, which have been improved in performance and function. First, the introduction of new energy metering chips The traditional energy metering chip HLW8012/HLW8032 can measure 1 channel voltage, current, power and power. The new energy metering chip can measure more comprehensive power parameters with higher precision. 1. Energy metering chip HLW8112 â— When the dynamic range is 3000:1, the active power error is <0.1%. â— 1 channel voltage detection, 2 channel current detection â— 2 active power, power calculation â—Leakage detection, zero-crossing detection, overload detection â—Line frequency, phase angle â—free calibration â— Working voltage: 3.3V/5V â— Built-in temperature sensor â— Built-in / external crystal oscillator â— 2-way configurable interrupt output â— UART / SPI interface â—SSOP16 package Figure 1 HLW8112 internal block diagram Figure 2 HLW8112 typical application circuit 2, energy metering chip HLW8110 â— When the dynamic range is 3000:1, the active power error is <0.1%. â— 1 channel voltage detection, 1 channel current detection â—1 active power, power calculation â— Zero crossing detection, overload detection â—Line frequency, phase angle â— Working voltage: 3.3V/5V â— Built-in crystal oscillator â—free calibration â—UART interface â—SOP8 package Figure 3 HLW8110 internal block diagram Figure 4 HLW8110 typical application circuit Second, HLW8112/HLW8110 new function application 1. Leakage protection After long-term use of household electrical appliances, as the device ages, there will be an increase in power consumption and even leakage, resulting in safety hazards. The HLW8112 adds 1 current detection channel to the single channel to detect leakage current. In Figure 2, the B channel conducts leakage detection of the load device through the current transformer. When the load device leaks, the HLW8112 quickly cuts off the power supply of the device through the INT2 pin output to protect the safety of the electrical user. 2, overload protection During the use of household appliances, due to improper use or aging of the device, working current and power overload may occur. Over time, the appliance may be damaged and fire may occur. HLW8112, HLW8110 can set the maximum value of current, voltage and power. When an overload abnormality is detected, the chip updates the corresponding register. The HLW8112 can also be configured to indicate an overload anomaly on the INT1 pin, which is more timely than the HLW8110. 3, free calibration HLW8112, HLW8110's own measurement error is controlled within 2%. If the current and voltage sampling resistors are used at 1% or higher, the measurement error of the whole machine will be controlled at about 3%. If the specifications of the product are met, all calibrations can be avoided. , saving a lot of equipment costs, labor costs, time costs. If the above error can not meet the product specification requirements, the metering module can be used as a separate module to perform module calibration. The calibration data can be saved in HLW8112, HLW8110, and the metering module can be directly connected to the whole machine, which eliminates the whole machine. calibration. 4, zero-crossing detection The zero-crossing detection function provides more efficient and safer power control for PWM control switching applications. The HLW8112 and HLW8110 have a zero-crossing detection function for current and voltage signals. The zero-crossing mode can also be configured through the register, and the internal detection result is updated to the corresponding register. The HLW8112 can be configured to indicate the zero-crossing detection result through the INT1 pin, and the response is more timely than the HLW8110. 5, 2 channel measurement The smart socket is divided into a single hole socket and a porous row plug. Each jack must have one metering module. Therefore, the previous porous plug metering module has many components and large volume, and occupies more interface resources of the MCU. HLW8112 can measure 2 currents, 1 voltage, 2 channels of power and power at the same time. One metering module can measure 2 jacks, reduce the size and reduce the cost. Figure 5 HLW8112 2-channel measurement application circuit 6, smart electricity Third, HLW8012/HLW8032/HLW8110/HLW8112 comparison table synergy for technology has been committed to promote Meter IC in smart home, smart appliances and "electric" related energy-saving products and applications, solutions, pulse output metering chip HLW8012 and UART The HLW8032 output from the serial port has been widely used in IoT products such as WIFI sockets and smart street lamps. The HLW8112 meter with leakage detection function is better than HLW8012 and HLW8032 in performance indicators. It can be used in smart home appliances, leakage detection equipment, metering meters, WIFI sockets, LED lighting and charging. Pile field. HLW8110 is an 8PIN metering chip, which is a simplified version of HLW8112. It only has 1 channel voltage measurement and 1 channel current measurement. It has built-in crystal oscillator and UART communication mode. It is especially suitable for product development with small mold size, such as WIFI socket. And PDU and other products.
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HLW8112, HLW8110 can also measure voltage dips, power factors, line frequency, peak value, phase angle and other energy parameters, integrated current, voltage RMS, active power, apparent power and other parameters, can establish a complete electrical operating state model. For example: judging the aging condition of the electrical appliance according to the power factor and the power abnormality, and the cause of the electrical fault; when the voltage dips, the peak value is too large, or the line frequency changes greatly, the working state of the electrical appliance is appropriately adjusted, so that the electrical appliance is always in safe use. High efficiency power consumption.
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