SLVAF35A February   2021  – July 2024 DRV8714-Q1 , TPS2HB16-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Contactors Distribution in EVs and HEVs
  6. 3Power-Up Sequence
  7. 4Coil Types and Control Requirements
  8. 5Coil Driving Implementation
    1. 5.1 Pulse Width Modulation Current Generation
    2. 5.2 Adjustable Supply Voltage Approach
  9. 6 Summary
  10. 7Revision History

1 Introduction

A high-voltage contactor, also called a high-voltage relay without distinction in the industry, is widely used in electric vehicles (EV) and hybrid electric vehicles (HEV). It is an electromechanical switching device with a coil to generate a magnetic force that mechanically operates an electric contact. However, it is more common to use a high-voltage contactor to represent high-power applications in EV and HEVs.

As a key safety device in new energy vehicles, a high-voltage contactor needs basic functions that are resistant to high voltage, load, shock, strong arc extinguishing, and breaking capacity. An appropriate current is applied to the coil such as using an IC, such as DRV3946, to ensure proper force to drive the contacts for robust operation. Even though there are many different types of contactors for different functions in a vehicle, the driving current profiles of all the contactor coils are similar.