Archive : 12 March 2016 год

Renesas has announced six new products in the 8th-generation G8H Series of its insulated gate bipolar transistor (IGBT) lineup. The IGBTs are rated at 650V/40, 50, and 75A, and at 1250V/25, 40, and 75A, they are available in TO-247 packages and are claimed to minimise conversion losses in power conditioners for solar power generation systems and reduce inverter applications in uninterruptable power supply (UPS) systems.

Compared to previous IGBT generations, these devices are said to provide faster switching performance while also reducing conduction loss by lowering the saturation voltage. Additionally, the devices’ performance index is claimed to have been improved by up to 30% compared to the previous 7th-generation IGBTs.

In solar power generation systems, there is inevitably some amount of power loss when the DC converts to AC by passing through an inverter circuit. Since the majority of this power loss occurs within the power devices used, reducing IGBT power loss has a direct positive effect on the power generation performance of user systems. Similarly, for UPS systems in server rooms and data centres, power constantly passes through a power converter circuit to monitor if the power supply has been interrupted, meaning that a steady power loss arises whenever the system is operating. IGBT performance is key to reducing this power loss.

In IGBTs, there has been a tradeoff between noise characteristics and switching speed. Renesas’ 8th-generation IGBTs are claimed to generate less gate noise during switching, enabling system manufacturers to eliminate the gate resistors previously needed to reduce noise. This contributes to a reduced component count and a more compact design.

Renesas also claims to have achieved the industry’s first TO-247 plus package for a 1250V IGBT with built-in diode, which offers system manufacturers greater circuit configuration flexibility. These discrete packages also add to the flexibility of circuit configurations for system manufacturers while giving high levels of heat dissipation up to 175°C.

The fast switching performance of the G8H Series IGBTs can be used in applications other than inverter circuits, for example, providing excellent performance for step-up circuits in converters.

Author
Tom Austin-Morgan

Source:  www.newelectronics.co.uk

Two flexible PCB antennas from Antenova are intended for use in what the company says is the fast moving 3G mobile device market. Both antennas support the GSM850, GSM900, DCS1800, PCS1900 and WCDMA2100 bands and will provide full coverage of the 3G bands in all world regions.

The antennas, designed to be mounted inside a small mobile or wearable device, are supplied with a cable and a connector for easy integration. With a thickness of 0.15mm, the antennas can be curved or folded to fit into tight spaces and can be fixed in place using a peel off strip.

The first antenna, called Avia (part number SRFC025) measures 71 x 12.5mm and is suitable for use in products like smart meters, femto/pico base stations, tracker devices, remote monitoring and POS terminals.

The second device, called Armata (part number SRFC011), measures 30 x 28.5mm and is suitable for smaller applications such as OBD-II units and in vehicle devices.

Both antennas come in a choice of three cable lengths and Antenova says it can also customise cable length and connector type.

Author
Graham Pitcher

Source:  www.newelectronics.co.uk