White Paper 48VDC

MicroCrystal RV-8803 – A Really Accurate RTC June 17, 2019- RTC chips traditionally were the domain of Maxim and NXP. Switzerland-based MicroCrystal recently made quite a buzz with its RV-8803, which offers simple integration, an I2C interface and extreme accuracy. Let us start out by looking at a system overview. Figure one shows how this I2C RTC is made up internally – interested observers note […]
Analog Devices’ LTM2887 – If a Digital Bus Needs Galvanic Isolation June 15, 2019- In theory, digital buses are intended to connect things to one another. Sadly, one sometimes wants but a logical connection – in many cases, galvanic isolation helps out. Should you ever feel like isolating very fast buses, definitely give the LTM2887 a chance. From a technical point of view, Linear Technologies attempt at entering the […]
AVAGO APDS-9008 or APDS-9005-020 – Keeping an Eye on Ambient Light June 14, 2019- Recent times saw quite a bit of interest for part numbers such as the APDS-9008 or APDS-9005-020 – they are a very interesting type of ambient light sensor. One of the oldest questions in regards to light sensors involves their spectral sensitivity. If a part is to output but one voltage level, the conversion between […]
STMicroelectronics’ LIS2DH12 – Low Power Motion Sensing June 12, 2019- Apple’s iPhone introduced gyroscopic sensors to a wider range – before that, accelerometers were not commonly found in consumer hardware. STM sells excellent parts which, however, get little media attention – time to take a look at the LIS2DH12. Integrating the part into your circuit as an MPU6500 alternative or MPU9500 alternative is not difficult. […]
Panasonic AMG8833 – FLIR for cheap June 7, 2019- FLIR made infrared thermal sensors cool – sadly, their parts are all but cheap (and suffer from export control problems). Panasonic’s Grid-EYE family is a low-resolution alternative which comes at significantly lower cost. From a technical point of view, Panasonic’s image sensor could not be simpler. We are looking at an 8×8 sensor with an […]
DipTronics DTS-62R-V – Small Switch, Very Big (and Very Cheap) June 5, 2019- When yours truly was but a lowly cadet, various US manufacturers produced (pricey but quite reliable) switches. Chinese vendors recently started to catch up – seeing the DTS-62R-V top our customer interest list shows that the run stage of the crawl-walk-run cycle is reached. DipTronics has been around the Asian switch market for ages, exhibiting […]
White Paper 48VDC

The Voltage rises

The idea of a higher vehicle electrical system voltage in automobiles is not new. As early as the 1990s, a 42V consortium was set up. However, due to a lack of standards, this approach was not successful. But now everything is to change.

Electricity used to be minimal in automobiles. They mainly ran mechanically. Electric windows? They didn’t exist. For this manually operated handles were used. Today, a whole host of electrical functions such as seat heating, comfort and assistance systems draw a lot of electricity from the battery. In a 12 V vehicle electrical system, higher and higher currents have to flow. To prevent this on-board network from surrendering, manufacturers are now installing a second, stronger network in the car in parallel – with 48 V direct current.

Advantages

A fundamental advantage of a 48 VDC vehicle electrical system is the lower loss of energy transmission. This is due to lower currents with identical power which results in a considerable savings potential in the design of the electrical conductor cross-sections. This is reflected positively in the weight of the vast quantities of cables installed in modern vehicles.

The 48 VDC vehicle electrical system also enables economical energy recovery and storage during braking (recuperation). The electric motor acts as a generator. In the case of high torque and/or power requirements, however, this system can also support the combustion engine by operating the electric motor in the reverse direction as an electric motor supplied from the 48 VDC battery. This process is also known as a “booster”. By completely decoupling the combustion engine from the on-board power supply, it can even be switched off completely while the vehicle is in motion. In contrast to conventional idling, no losses occur in the combustion engine during “sailing”. This can result in significant fuel savings.

Reflowable Thermal Switch

RTS is a particularly compact overtemperature protection device for power semiconductors in SMD technology. It was developed to protect highly integrated power electronics from overheating, such as those used in the automotive, medical and many other industries.