Application of Hall Current Sensor in Electric Vehicle Mode 2 Charging Device

The EV charging Cable Extension is also an important complementary product to the portable charging solution, and is increasingly favored by users. It can effectively solve the problem of insufficient distance between the charging post and the vehicle, and enhance the adaptability and convenience of IC-CPD in practical application scenarios.

01 Overview of Electric Vehicle Charging Modes

According to GB/T 18487.1-2015 and other national standards, the charging mode of electric vehicles can be divided into the following four modes:

Mode 1: Directly connecting the vehicle to the ordinary AC power grid without protection measures, which has been banned;

Mode 2: Connecting to the AC power grid through portable devices with control and protection functions;

Mode 3: Connecting to special AC charging equipment with a guide and protection module;

Mode 4: Fast charging through a DC charging device with a control and guidance function.

Mode 2 charging is an important addition to the home charging solution due to its simple structure and flexible installation. The use of EV chargingcable extension further expands its applicability in complex environments.

02 IC-CPD Structure and function

The on-cable control and protection device (IC-CPD) is the core component of mode 2 charging and integrates the cable, plug, connector and function box. The function box performs three main tasks:

Residual current protection: to avoid the risk of personal electric shock;

control guidance function: to enable communication with the electric vehicle;

current switching control: to ensure the safe opening and closing of the current loop.

IC-CPD can be used at a voltage not higher than 250V and a maximum current not more than 16A, which is suitable for single-phase AC environment, emphasizing safety, compactness and stability. For some special parking spaces or long-distance power consumption environments, using with EV chargingCable Extension can effectively extend the connection distance and enhance the user's charging freedom.

03 Hall Current Sensor's Key Role in IC-CPD

In IC-CPD, Hall Current Sensor is used to monitor the charging current change in real time to ensure the effective execution of overcurrent protection, power failure control and other functions. Its selection criteria must meet the following items:

Operating voltage: ≥ 250V
Rated current: ≥ 1.5 × charging current
Compact structure, strong anti-interference ability
With good temperature stability and linearity

CC6920 chip Hall current sensor as an example, it is designed for space constraints, high performance requirements of the application environment and designed for motor control, load monitoring, switching power supply and overcurrent protection and other fields.

Main features:

Measuring range: 5A-50A, support DC and AC

High accuracy: 0.5% error at room temperature, ±3% error over the full temperature range

Compact structure: internal integration of low impedance (0.9mΩ) lead wire

Fast response: bandwidth up to 250kHz, step response time of 1.2μs

Safe isolation: with a 3500VRMS isolation voltage withstand capability

Strong anti-interference: Differential Hall structure and dynamic misalignment cancellation technology

Compact package: Adapted to the space constraints of portable charging devices

Output characteristics: When the input current is OA, the output voltage is VCC/2, which varies linearly with the current

04 Market Trends and Prospects of IC-CPD

Although IC-CPD is a slow charging device, it has obvious advantages such as low construction cost, high adaptability, and high safety. It is especially suitable for home deep charging by utilizing the low electricity price at night to extend battery life.

Currently, most car companies sell new cars with randomly equipped Mode 2 chargers, i.e., IC-CPD devices. It is predicted that the testing, certification and demand for IC-CPD products and their key components (such as Hall current sensors) will continue to grow as the number of electric vehicles rises rapidly. As an auxiliary solution for mode 2 charging, the EV chargingcable extension will also play a non-negligible role in enhancing users' charging convenience.