EV Charging Protection Type B RCD Leakage Current Sensor
Electric vehicles are becoming more mainstream but remain in the early stages of development and commercialization. Building out a rapid-charging infrastructure is critical to ensuring the continued growth of EVs, and sensors are central both to the vehicles and to the infrastructure. Detection applications require sensors for measuring voltage, temperature, and current. Because DC and AC errors can occur in customer applications, a differential current sensor that can monitor residual currents is required.
International standard "IEC62752-2016 In- cable control and protection device for mode 2 charging of electric road vehicles (IC-CPD)" was officially released in 2016. The function and role of IC-CPD are specified in the standard. Among them, TypeB residual current detection becomes an important function. The RCPD (Residual Current Protection Device) series of residual current sensors launched by RichSens fully meet this standard.
The second charging mode (Mode2) is gradually popularized. IC-CPD has become a standard accessory in electric vehicles. The popularization of IC-CPD can greatly facilitate charging at any time, including home charging and out-of-home charging. As the second charging mode (Mode2), it is also accepted by more users. As the standard is upgraded and unified, more OEMs will also choose IC-CPD as a standard accessory.
In 2017, the global sales of new energy electric passenger vehicles were 1,197,100, a year-on-year increase of 67%, of which overseas sales were 629,700 (a year-on-year increase of 51.78%) and China's sales were 567,400 (a year-on-year increase of 88.1%). Most of them are based on pure electric vehicles.
Residual current monitoring and residual current popularization application can be traced back to around 1990. It was TypeAC at the earliest, and TypeB residual current monitoring has been adopted in many fields. The containment relationship is shown in Figure 2. It is precisely because of the complexity of the electrical equipment and the complexity of the circuit topology that the residual current monitoring has evolved from the TypeAC type to the current TypeB type. The TypeB residual current definition includes TypeAC, TypeA and DC residual current, so TypeB residual current detection is a relatively high requirement for residual current detection.
TypeB refers to the smooth DC and intermittent DC on the basis of Type A leakage (AC, pulsating DC, half-wave AC).
In the field of electric vehicles, The internal charging topology is more complicated, and the electric vehicle power battery is a DC power supply system. Therefore, the current component is more complicated, including AC current and pulsating current, especially in this special application scenario. Based on this, the residual current is also more complicated. The power battery of an electric vehicle is equivalent to a very large capacitive load. Therefore, when a leakage occurs, the TypeB DC residual current will often appear in the circuit.
In order to protect the safety of life and property, it is recommended to install a Type B leakage current sensor or Type B leakage circuit breaker with higher protection level on the charging pile. Choosing more type B leakage current sensor plz visit www.ivy-metering.com
