Why are resistors indispensable in automotive applications?

Resistors are small components with a big impact.

they regulate current
protect sensitive electronics and
play a crucial role in vehicle safety.

Without resistors, many processes in a conventional automotive electrical system or in the high-voltage system of an electric vehicle simply would not work.

Especially with the trend toward electrification, they are becoming even more important and have become indispensable in modern automotive applications.

What functions do resistors perform in a car?

Resistors are used in many parts of a vehicle. They keep systems stable, protect components, and ensure that electrical energy is used in a controlled manner.

Protection of electronics: Resistors limit current and voltage, thereby preventing damage to control units or sensors.

Energy conversion: Braking, load, and discharge resistors convert electrical energy into heat, thereby preventing excessively high voltages or overloads.

Process control: Specialized resistors perform key tasks such as precharging capacitors or safely discharging them after shutdown.

What types of resistors are used in automotive applications?

Standard resistors in control units

In low-voltage applications, such as control units or sensors, traditional SMD or wire-lead resistors are typically used. They perform measurement and protection functions and keep the current flow within the desired limits.

Precharge Resistors for High-Voltage Systems

When an electric vehicle is started, the DC link or intermediate circuit capacitor must be charged in a controlled manner. The precharge resistor limits the inrush current, thereby protecting contacts, fuses, and power semiconductors.

Miba relies on non-inductive resistors that have been specifically developed for automotive applications. They are

• compact,
• lightweight, and
• AEC-Q200 qualified.

Thanks to their design, they can be easily integrated into inverters and meet the highest safety and reliability requirements in high-voltage electrical systems.

Find out more here: Precharge resistors for electric cars

Discharge resistors for safe shutdown

After shutdown, energy remains stored in the DC link, which can cause dangerous voltages. This is where the discharge resistor comes into play: It safely dissipates the residual voltage, ensuring that the system can be maintained safely and that high-voltage safety requirements are met.

Miba discharge resistors are specifically designed for DC-link capacitors in electric vehicles. They combine

high thermal capacity with
a space-saving design that fits perfectly into modern inverters.

Through rigorous testing in accordance with automotive standards, they guarantee reliable performance throughout the vehicle's entire service life.

You can find more details here: Discharge Resistors for Electric Cars

What conclusions can be drawn about resistors in automobiles?

Resistors are small components that play a major role. They protect sensitive electronics, control the flow of energy, and reliably safeguard high-voltage systems.

Key points at a glance:

Resistors protect control units and electronics from overload.

In the form of braking and load resistors, they safely convert energy into heat.

Precharge resistors enable high-voltage systems to be started up gently.

Discharge resistors reliably dissipate residual voltages and increase safety.

Miba offers solutions specifically designed for automotive applications. Contact us. Together, we’ll develop the right resistive technology for your application.