High Voltage Inter-lock (HVIL) is also the abbreviation of Hazardous Voltage Interlock Loop
High-voltage interlock refers to a safe design method for monitoring the integrity of high-voltage circuits with low-voltage signals. By using low-voltage signals to check all components connected to the high-voltage wiring harness on the electric vehicle, the electrical connection integrity (continuity) of each high-voltage system circuit is detected.
Theoretically, the low-voltage monitoring circuit is connected first and then disconnected than the high-voltage monitoring circuit, and the necessary advance is maintained. The specific high-voltage interlock implementation form may have different designs for different projects.
In the high-voltage circuit of electric vehicles, the electrical components required to have the HVIL function are mainly high-voltage connectors, manual maintenance switches (MSD) and other electrical interface components that require manual operation to realize the connection or disconnection of the circuit.
1 Purpose of high voltage interlock
The purpose of the high-voltage interlock is to confirm the integrity of the entire high-voltage system. When the high-voltage system circuit is disconnected or the integrity is damaged, safety measures need to be activated.
2 The role of high-voltage interlock, why do high-voltage interlock design
The high-voltage interlock is mainly used to ensure the safety of the high-voltage system, and has three main functions:
First, it is used to detect the looseness of the high-voltage circuit (which will cause the high-voltage power outage, the vehicle to lose power, and affect the safety of the car), and to provide alarm information to the vehicle controller before the high-voltage power outage, and reserve the vehicle system to take countermeasures. time.
The second is to play a role before the vehicle is powered on, and if the circuit is detected to be incomplete, the system cannot be powered on to avoid accidents caused by problems such as virtual connections;
The third is to prevent safety accidents caused by human misoperation. During the working process of the high-voltage system, if there is no high-voltage interlock design, manually disconnect the high-voltage connection point. At the moment of disconnection, the entire circuit voltage is applied to both ends of the breakpoint, and the voltage breakdown air draws an arc between the two devices. , the time is short, but the energy is high, which may cause damage to personnel and equipment around the breakpoint.
Now I believe that you have a better understanding of high-voltage interlock connectors. In the next section, the engineers of Elecbee will explain the working principle and implementation of high-voltage interlocking, want to know more about high voltage interlock, please call + 86 18271418329, or email service@elecbee.com, we are of service at any time.
