Grid current meter design based on CS5460A chip - Power Circuit - Circuit Diagram

Probe current voltage pin 420x4450mm, head diameter 5.0mm, overcurrent protection for voltage and current pins.

SMD aluminum electrolytic capacitor for enhanced durability and efficiency.

MOS power IC covering the full range of applications from low to high voltage.

Inductance optimized for improved performance and reliability.

Abstract: This paper presents a novel design approach for a civilian grid current meter based on the CS5460A energy metering chip. The fundamental working principles of the device are outlined, and the circuit components including the switching power supply, detection circuit, control circuit, and display circuit are discussed in detail. The design methodology for the detection circuit is explained, along with a flowchart of the program design.
Keywords: grid current meter; switching power supply; AT89C52; CS5460A

O Introduction: Conventional grid current meters typically rely on analog pointer-based systems, which suffer from issues such as limited measurement ranges, poor stability, low precision, and difficult-to-read pointers, making them unsuitable for modern societal needs. With advancements in intelligent measurement technologies, digital meters controlled by microcontrollers are now showing significant advantages. This paper leverages a single-chip microcontroller as the primary controller, utilizing Cirrus Logic's energy metering chip to gather data, resulting in a cost-effective, highly interference-resistant, and precise grid current meter design.

1 System Working Principle: Accurate and real-time measurement of grid current is critical in both industrial and everyday contexts. In this study, a switching regulator power supply converts 220V AC mains power into dual +5V analog and digital power supplies for the entire meter circuit. The current signal is detected using a current transformer, converted into a voltage signal, and sent to the single-phase power integrated chip CS5460A for signal sampling, calculation, and error correction. The entire process is managed by the MCU. The working principle and block diagram of the system are illustrated in Figure 1.

[3][4]