What Is the Active Short Circuit in an Electric Vehicle?

So, what is the active short circuit in an electric vehicle? It’s a safe state that’s triggered when certain materials are placed inside the battery. It can occur in a hybrid electric vehicle with traction batteries as well. Like features and components are referred to by like reference numbers. In this article, we’ll examine how an active short circuit can affect brake torque, forecasting, and forecasting errors.

An active short circuit (ASC) is a safe state in an electric vehicle

An active short circuit is a safety feature of an electric vehicle, which prevents damage to the electrical system. The ASC process takes place when the motor speeds reach a certain threshold and the car enters a safe mode. During the active short operation, a motor produces impulse current, which flows across the switch transistor. This impulse current damages the inverter and damage the battery.

To protect the electric car from this dangerous condition, ASC employs a brake mode. When the brake is applied, the energy stored in the motor returns to the supply through the MOSFET body diodes. This energy charges the bulk capacitors on the supply. The active short circuit uses a series of discrete components, including high and low-side MOSFETs.

Active Short Circuit in an Electric Vehicle
Active Short Circuit in an Electric Vehicle – Photo by Michael Fousert on Unsplash

It can be triggered by placing special materials inside the battery

Using special materials inside the battery could trigger an active short circuit in an electric vehicle. Usually, this can happen because a vehicle has high power consumption and a short circuit can result. The time between the pulses must be longer than the current. In some cases, special materials are placed inside the battery to prevent an active short circuit from occurring. However, this technique is not very effective because the vehicle could experience damage if the circuit is triggered.

It can be forecasted

The first step in forecasting EV charging time is to understand its nature. Currently, EV charging is highly unpredictable. In addition, the start-up time of the charging block is highly uncertain. Therefore, forecasting methods based on standard statistical indices usually result in flat forecasts. In this paper, we present a three-step approach to forecasting EV charging time. To see this approach in action, we present an example.

The VAR method uses multivariate time-series models, or “regression” techniques, to predict electric vehicle sales. This method was first developed in 1976 by George Box and Gwilym Jenkins and has since been widely applied to several different fields, such as real estate sales, automobile market share, economic indicators, rainfall patterns, and other data. The VAR model is a combination of previous research on automobile sales prediction to estimate EV sales. The authors then examine the characteristics of EV market penetration and use this information to build a multivariate VAR model.

It affects brake torque

Various methods of safe state switching for an electric motor are available in the market, and there are many differences between them. The main difference between open-circuit operation and active short-circuit operation is that the former generates strong brake torque, which may lead to a rear-end collision accident. The latter also causes a significant increase in the amount of current when the motor enters a safe state. As a result, controllers with active short-circuit operation are required to use IGBTs that have higher current tolerances, which will increase the cost of the inverter. However, these motors are not required to operate in the open circuit mode, and the former is safer, as long as it controls the current to a stable level.

The active short circuit in an electric vehicle affects the brake torque in two ways. First, the vehicle’s controller is responsible for setting the voltage in the brake system. However, the driver circuit can also control the current by disconnecting Lowside-/Highside-Schaltschalter 5B, 5A. These circuits are responsible for the generation of brake torque, and they must be able to provide the required voltage for the motor to perform.