By the end of 2025, the number of charging infrastructure installations in China exceeded 20.092 million, with a vehicle to pile ratio improved to 2.2:1 (source: China Electric Vehicle Charging Infrastructure Promotion Alliance). The National Development and Reform Commission’s Three-Year Doubling Action Plan for EV Charging Facility Service Capacity (2025–2027) specifies that by the end of 2027, 28 million charging facilities will be built to support more than 80 million EVs. Along with strong policy support, law enforcement has intensified. In April 2026, charging station operators in Guangxi, Shanghai, Shandong, Sichuan and other regions were penalized for operating without mandatory certification or continuing to use unqualified equipment. Metering compliance and electrical safety relying on high-performance current sensor devices have become mandatory thresholds.
Meanwhile,Famous Electric Vehicle Brand’s second generation Blade Battery and megawatt flash charging system support up to 1MW charging power based on 1000V high voltage architecture. High power DC fast charging has been adopted in about 40% of public stations and is expected to exceed 70% in new public fast charging stations within two years. Such rapid growth and high voltage compliance pose unprecedented demands on CHIPSENSE current sensor and residual current sensor solutions.
This document clarifies key sensing requirements for EV charging stations and provides a precise selection framework built around the CHIPSENSE current sensor product portfolio.
I. Key Industry Requirements & Technical Challenges
Main Loop Current Measurement
Covers full power ranges from 7kW AC chargers to 480kW ultra fast chargers. Requires current sensor devices with high precision, wide bandwidth, strong temperature stability and high cost performance.
Type B Residual Current Protection (RCD Type B)
Mandatory safety requirement. Under GB/T 18487.1 2023 and GB/T 22794 2017, Type B RCD must reliably detect and disconnect AC, pulsating DC (6mA smooth DC and above), and composite residual current wave-forms. This demands extreme sensitivity, response speed and signal processing from a high performance Type B current sensor.
DC Bus Voltage Monitoring
In DC chargers, up to 1000V DC bus voltage requires high precision, high isolation voltage sensor support to ensure system stability and safety.
High Reliability: Adapt to harsh outdoor environments (wide temperature, humidity, EMC interference) while maintaining long term accuracy and consistency for CHIPSENSE current sensor modules.
II. CHIPSENSE One Stop Sensor Solution for EV Charging Stations
CHIPSENSE provides a full product matrix covering main current sensing, residual current protection and voltage measurement, fully supporting all charging station scenarios with reliable current sensor and voltage sensor components. CHIPSENSE can offer all kinds of current sensors.
1. Main Circuit Current Detection Solutions
Choose open loop or closed loop Hall technology based on performance and cost needs.
Solution A: CHIPSENSE AN1V Series Open Loop Hal Current Sensor
Ideal for cost sensitive compact designs
Technical Features: Open loop Hall effect, single 3.3V power supply. Greatly simplifies the peripheral circuitry.
Key parameters: ±50A to ±300A rated current(IPN); typical accuracy ±1%; bandwidth 250kHz
Selection Recommendation: Suitable for AC/DC charging piles where space and cost are critical constraints, yet specific performance requirements must still be met; an ideal choice for 7 kW to 60 kW charging pile models. CHIPSENSE AN1V PB321 could be one of the options.
Solution B: CHIPSENSE AN5V PB00 Series Open Loop Hall Current Sensor
General purpose high performance option
Technical Features: Open loop Hall, dual ±12V~±15V supply from CHIPSENSE
Key parameters: ±10A to ±60A rated current, typical accuracy ±0.9%
Selection Recommendation: Suitable for use in various variable-frequency speed control, inverter, and power supply equipment. In EV charging piles, it can be utilized for current detection in applications such as auxiliary power supplies, fan and pump control systems, and similar scenarios. The applications of CHIPSENSE current sensors extend far beyond this.
Solution C: CHIPSENSE CS3A P00 Series Closed Loop Hall Current Sensor
Ultra high precision & fast response
Technical Features:CHIPSENSE closed loop (compensated) Hall design
Key parameters: ±50A/±100A/±125A, accuracy ±0.3%, response time 0.5μs, bandwidth 150kHz
Selection Recommendation: Suitable for main current sensing in high-power DC charging piles where extreme demands are placed on measurement accuracy, response speed, and dynamic range; an ideal choice for solutions prioritizing top-tier performance.
2.Type B Residual Current Protection (RCD Type B) Solutions
The core safety subsystem, fully supported by CHIPSENSE current sensor modules.
Solution 1: (Split type): CHIPSENSE CSMD1 + TR3A 6 C00 Current Sensor Kit
Flexible configurable B Type protection module
Technical Features: A split-architecture solution specifically designed for Type B residual current protection in EV charging piles. The system consists of the CSMD1 processing module and the TR3A dedicated current transformer.
Main Functionality: CHIPSENSE current sensors are fully compliant with B Type standards such as IEC62752 and GB/T 22794, capable of detecting 6mA smooth DC, 30mA AC, and various pulsating DC residual currents. The module directly outputs a trip control signal and integrates self-test and zero-calibration functions.
Selection Recommendation: Suitable for Mode 2 and Mode 3 charging equipment, offering developers maximum design flexibility and ease of verification. Like CHIPSENSE supplier.
Solution 2: CHIPSENSE FR1D 6 C02 Type B Residual Current Sensor
Technical Features: Integrates Type B residual current sensing and protection logic into a single device, featuring an ultra-compact form factor.
Main Functionality: CHIPSENSE current sensor satisfies B Type full-spectrum residual current protection requirements; incorporates built-in processing logic capable of directly outputting a trip signal. Includes an integrated self-test function and complies with relevant safety standards.
Selection Recommendation: Ideal for the design of single-phase or three-phase EV charging piles where space is limited and high integration is desired, significantly simplifying PCB layout.
Solution 3 (Integrated): CHIPSENSE TR6A 32 C00 & FR1D 6 C00 Integrated Module—Combined Current Measurement and Type B Protection
Technical Features: An innovative integrated design that combines a 32A measurement-grade current transformer with an CHIPSENSE FR1D B Type residual current sensor into a single unit.
Main Functionality: While providing comprehensive Type B earth leakage protection, it simultaneously integrates the measurement function for the main circuit current, enabling its use for both system monitoring and protection purposes.
Selection Recommendation: This serves as an optimized solution for AC charging stations (AC piles), utilizing a single module to simultaneously address two key requirements—leakage protection and main current measurement—thereby significantly saving both space and cost. Providing customers with high-quality products while saving costs is one of the objectives of CHIPSENSE current sensors.
3.High-Precision DC Leakage Current Measurement (Not Exclusively for Type B Protection)
For applications requiring precise monitoring of DC system-to-ground insulation—such as photovoltaic energy storage systems and data center power supplier—CHIPSENSE offers specialized sensors.
Solution: CHIPSENSE FR5V H00/FR7V P00 Series Fluxgate Leakage Current Sensors- High-Precision DC Leakage Monitoring
Technical Features: Based on fluxgate technology, these sensors feature ultra-high precision and extremely low zero-point temperature drift.
Key Parameters: Available in multiple rated current ranges, including ±10mA, ±20mA, ±50mA, and ±100mA (CHIPSENSE FR5V Series), as well as ±200mA (CHIPSENSE FR7V Series); outputs an analog voltage signal.
Application Focus: Primarily designed for the precise measurement of DC leakage currents, serving as an ideal front-end sensor for insulation monitoring in scenarios involving PV inverters, energy storage systems, server power supplies, and similar equipment. Please Note: When utilizing these sensors for Type B protection in EV charging piles, it is essential to ensure that the downstream system possesses the capability to process the full current waveform. CHIPSENSE current sensor is a good choice for these applications.
4. DC Bus Voltage Detection Solution
Solution: CHIPSENSE VN2A P06 Series Closed-Loop Hall-Effect Voltage Sensor — Wide-Range, High-Precision Isolated Measurement
Technical Features: Based on the closed-loop Hall-effect principle, this sensor indirectly measures high voltage by detecting the current flowing through an external resistor (R1), thereby achieving a high level of electrical isolation between the primary and secondary sides.
Key Parameters: The rated primary input current (IPN) is ±5mA. By configuring different external measurement resistors (R1), the device enables wide-range DC or AC voltage measurement spanning from 10V to 1500V, offering high accuracy and excellent linearity.
Selection Recommendation: Ideal for the isolated measurement of DC bus voltage in DC charging piles, serving as a critical feedback component for system control and protection functions.
It goes beyond just this: CHIPSENSE is dedicated to providing customers with current sensors characterized by high accuracy and excellent linearity. CHIPSENSE VN2A voltage sensor is one such example.
III. Summary and Selection Recommendations
In 2026, driven by the dual forces of favorable policies and regulatory pressures, the EV charging pile industry is accelerating its transition and upgrade from a focus on "scale expansion" to one of "quality and compliance." CHIPSENSE is also one of the current sensor manufacturers facing these adjustments. As critical components for sensing electrical signals within charging piles, current sensors and leakage current sensors play a decisive role: their proper selection directly determines whether a device can pass mandatory verification, operate safely and stably, and ultimately earn customer trust midst increasingly fierce market competition. The CHIPSENSE current sensor will undergo upgrades to align with market demand.
This is a simple quick-reference selection guide for CHIPSENSE current sensors.
| Application | Core Needs | Recommended CHIPSENSE Current Sensor | Key Features |
Main current measurement | Cost effective, compact | AN1V PB301 series | Single 3.3V supply |
| Ultra high precision, fast | CS3A P00 series | Closed loop Hall, ±0.3% accuracy | |
Type B leakage protection | Flexible design | CSMD1 module + TR3A Transformer | Modular, direct trip output |
| High integration | FR1D 6 C02 series | Ultra small size | |
| Integrated measurement | TR6A & FR1D Integrated Module | 2 in 1 protection + sensing | |
DC leakage monitoring | High precision | FR5V / FR7V series | Fluxgate current sensor for insulation monitoring |
DC voltage measurement | High isolation, wide range | VN2A P06 series | 10–1500V measurement |
CHIPSENSE offers a complete current sensor and voltage sensor lineup covering everything from residential AC chargers to high power DC ultra fast chargers. With one stop solutions for current sensing, B Type leakage protection and voltage monitoring, CHIPSENSE current sensor products help charging equipment manufacturers achieve compliant, reliable and efficient design and delivery. CHIPSENSE is an excellent choice among professional manufacturers of current and voltage sensors.
CHIPSENSE is a national high-tech enterprise that focuses on the research and development, production, and application of high-end current and voltage sensors, as well as forward research on sensor chips and cutting-edge sensor technologies. CHIPSENSE is committed to providing customers with independently developed sensors, as well as diversified customized products and solutions.
“CHIPSENSE, sensing a better world!
www.chipsense.net