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EBG equivalents for Vishay thick film power resistors

ebg-power-resistors

EBG manufacture equivalents for thick film power resistors manufactured by Vishay. EBG components are robust which do not break when over-tightened. In addition, every single resistor is X-rayed before shipment to ensure the highest quality of soldering. Custom designs are also possible.

EBG vs Vishay Resistors 1000-2000W

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint/Package (mm)
EBG UXP-2000 2000 @ 125C 5000 150 5, 10% 1 6k 57.5 x 60
Vishay LPS 1100 1100 @ 25C 150 1, 2, 5, 10 1 1.3k 57 x 60

EBG vs Vishay Resistors: 750-800W

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint/Package (mm)
EBG UXP-800 800 @ 85C 5000 150 1*, 2*, 5, 10 0.25 1M 57.5 x 60
EBG ULX-800 800 @ 85C 5000 150 5, 10 0.1 1M 57 x 57.5
EBG UPT-800 800 @ 85C 5000 150 5, 10 0.1 1M 57.5 x 60
Vishay RCEC 750 @ 75C 5000 150 5, 10 1 1M 57 x 60
Vishay LPS 800 800 @ 85C 5000 150 1, 2, 5, 10 0.3 900k 57 x 60

EBG vs Vishay Resistors 500W-600W

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint/Package
(mm)
EBG UXP-600 600 @ 85C 5000 150 1*, 2*, 5, 10 0.2 1.5M 57.5 x 60
EBG ULX-600 600 @ 85C 5000 150 5, 10 0.1 1M 57 x 57.5
EBG UPT-600 600 @ 85C 5000 150 5, 10 0.1 1.5M 57.5 x 60
Vishay RPS 500 500 5000 150 1, 2, 5, 10 0.24 1M 57 x 60
Vishay RCEC 500 500 @ 70C 5000 150 5, 10 0.47 1M 57 x 60
Vishay LSP 600 600 @ 85C 5000 150 1, 2, 5, 10 0.3 900k 57 x 60

EBG vs Vishay Resistors 250W-350W

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint/Package (mm)
EBG UXP-350 350 @ 85C 5000 150 1*, 2*, 5, 10 0.12 1M 57.5 x 60
Vishay RPS 250 250 @ 50C 5000 150 1, 2, 5, 10 0.25 1M 57 x 56
Vishay LSP 300 300 @ 85C 5000 150 1, 2, 5, 10 0.3 900k 57 x 60

EBG vs Vishay Resistors 200W

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint/Package
EBG HXP 200 200 @ 85C 500 250 1, 2, 5, 10 0.1 1M SOT-227
Vishay RTOP200 200 @ 25C 150 1, 2, 5, 10 0.046 1M SOT-227

EBG vs Vishay Resistors 400W

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint/Package (mm)
EBG UPT-400 400 @ 85C 5000 150 1*, 2*, 5, 10 0.5 1M 66 x 40
Vishay RCEC 400 400 @ 75C 4000 150 5, 10 1 1M 66 x 40

EBG vs Vishay Resistors 100W-180W

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint (mm)/Package
EBG GXP 120 120 @ 85C 500** 250 1, 2, 5, 10 0.1 1M SOT-227
EBG HPP 150 150 @ 85C 500** 250 1, 2, 5, 10 1 1M 45.6 x 26.5
EBG HPS 150 150 @ 85C 500** 250 1, 2, 5, 10 1 1M 45.6 x 26.5
EBG VHP 180 @ 85C 500** 250 1, 2, 5, 10 1 1M 45.6 x 26.5
EBG AXP-100 B 100 @ 85C 500*** 250 1, 2, 5, 10 1 1M 45 x 26.4
Vishay RCEC ISO 100 @ 60C 1500 250 5, 10 0.33 1M 38 x 25
Vishay DRTOP100 100 @ 25C 150 1, 2, 5, 10 0.046 1M 38 x 25
Vishay RTOP100 100 @ 25C 150 1, 2, 5, 10 0.046 1M 38 x 25

EBG vs Vishay 50W “special footprint”.xlsx

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint (mm) / Package
EBG AXP-50 50 @ 85C 500** 250 1, 2, 5, 10 1 1M 25 x 15
Vishay DRTOP50 50 @ 25C 150 1, 2, 5, 10 0.091 1M 38 x 25

EBG vs Vishay 20W-50W

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint (mm) / Package
EBG MSP 35 35 @ 25C 350 50**** 1, 2, 5, 10 0.1 1M TO-220
EBG MXP 35 35 @ 25C 350 50**** 1, 2, 5, 10 0.05 1M TO-220
EBG LXP-20 20 @ 25C 350 50 1, 2, 5, 10 0.05 1M TO-220
Vishay RTO 50 50 @ 25C 500 150 1, 2, 5, 10 0.01 550k TO-220
Vishay LTO 50 50 @ 25C 500 150 1, 2, 5, 10 0.01 550k TO-220
Vishay RTO 20 20 @ 25C 500 150 1, 2, 5, 10 0.01 550k TO-220
Vishay LTO 30 30 @ 25C 500 150 1, 2, 5, 10 0.01 550k TO-220

EBG vs Vishay lower power 100W special footprint

  Series Power (W) Voltage (V) Typical TCR (ppm/C) Tolerance (%) Resistance min. (Ω) Resistance max. (Ω) Footprint (mm)/Package
EBG LXP-100 B 100 @ 25C 350***** 50 1, 2, 5, 10 0.05 1M TO-247
VIshay LTO 100 100 @ 25C 500 200 1, 2, 5, 10 0.015 1M TO-247

* on special request for limited ohmic values with the reduction of the max. power/pulse rating
** up to 1000V on special request = “S” -version
*** up to 1500V on special request = “S” -version
****<3Ω: ask for details, ≥3Ω <10Ω: 100ppm, ≥10Ω: 50ppm
*****500V on special request

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LEM adds digital output to open-loop Hall-effect current transducers

LEM has now completed a range of open-loop Hall effect current transducers that provide a digital output.  Used typically in drive applications, these new units provide nominal current measurements of 16 – 250A rms  at up to 12-bit resolution with 20kHz bandwidth. The units are available in four different mechanical designs for both PCB and panel mounting.

How does it work?

Analog to digital conversion is performed by an integrated sigma-delta modulator, giving a one-bit serial bitstream output.

  • Digital output from a sigma-delta modulator
  • 12-bit effective resolution with 20kHz bandwidth
  • 10MHz clock frequency
  • Additional overcurrent detection output

HLSR 40-PW and HO 80 digital output current transducers

Why digital output ?

Digital output allows the user to choose the filter used on the bitstream to optimize between resolution and response time. Digital outputs are also immune to noise. A single-bit output minimises the connections required, ensuring that the transducers are highly compact.

Digital output formats

  • Single-bit output two wire CMOS (with clock in or out modes)
  • RS422 Manchester
  • LVDS Manchester
  • Four-wire mode according to the LVDS or RS 422 (Clock in or out) standards.

Different filters on the same bitstream

Several different filters may be used on a given bitstream. A sinc3 filter is used with an over-sampling ratio of 128 the effective resolution of a 50A sensor is 12 bits, and the response time 38µs. A sinc2 filter with an over-sampling ratio of 16 would give a response time of 4,6µs from the same bitstream, but the resolution would be reduced to 6 bits.

Response time to over-current

Transducers in the HO family have an Over-Current Detect (OCD) feature which measures the current level before the A/D converter with a response time of 2us.
Same footprints as existing sensors
Same footprints as the analogue HLSR. HO-NPW, HO-PW and HO-SW models

Configurations:

Users can have single-ended and Manchester modes with two extra pins so clock and data may be differential signals to meet RS422 and LVDS standards.
The transducer clock may be configured as an input in the range 5 – 12.5MHz to allow a single clock to be used throughout the system.

Voltage range and operating temperature

The new transducers can use a supply voltage of 3.3 V or 5 V. Operating temperature range is from -40°C to +105°C.

About LEM

LEM manufacture market-leading current and voltage transducers used in demanding applications such as drives, welding, renewable energy, power supplies, traction, high precision and automotive. LEM has production locations in Beijing (China), Geneva (Switzerland), Machida (Japan) and Sofia (Bulgaria).

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PPM Power appointed Excelsys distributor

PPM Power have been appointed a UK distributor for Excelsys power supplies, adding the manufacturer’s high efficiency and low profile power supplies to a wide portfolio of power electronics components and systems. Excelsys, now part of the Advanced Energy group, manufacture power supplies for industrial, medical, lighting and communications applications.

Unique design features

“Excelsys are a market leader in design and manufacture of modular power supplies,” says Ray Goodenough, Business Development Manager at PPM Power. “They produce high technology power supplies, incorporating unique features, making them desirable in the UK power electronics market. We are excited to enhance our current range of power supplies for our UK customers with this addition.”

Fanless technology at 1800W

Based in Cork, Ireland, Excelsys have been in operation for over 20 years and currently manufacture a range of high quality products which provide power solutions upwards from 200W. Products are tailored specifically to suit the medical, industrial or high-reliance industries, offering the best performance. Their leading products feature in the CoolX and UlitMod ranges.

CoolX

Modular power supply CoolX1800 provides 1800W in a compact package, exhibiting up to 50% more power density than other solutions. With medical approvals of two MOPPs (means of patient protection) and  ISO13485, applications include dialysis equipment and clinical chemistry. The power density and fanless cooling make it ideal for high performance industrial applications including test and measurement. The CX18M carries IEC60601-1 3rd edition & IEC60601-1-2 4th edition (EMC) for medical applications.

  • Efficiencies up to 93%
  • Up to 1800W
  • Surge protection

UltiMod

Medical power supply UltiMod UX6 can be populated with up to six powerMods, delivering power up to 1200W. The UltiMod range are SEMI F47 compliant and user field configurable. The range is medically approved to two MOPPs and 4KV isolation. UltiMod is used for medical applications including clinical diagnostic equipment and radiological imaging, plus industrial applications including automation equipment.

  • Efficiencies up to 92%
  • Dual safety approvals: IEC60950 2nd edition & IEC60601-1 3rd edition
  • Small footprint and lowest acoustic noise

Complete power solution

“PPM have been a long term partner of Advanced Energy, successfully supporting our high voltage customers from initial concept through to production in the UK,” says Martin Brabham, Head of Distribution, EMEA at Advanced Energy. “We are excited to expand this co-operation with PPM to include the Excelsys product line of best-in-class, field configurable, modular power supplies. These are often used in conjunction with the high voltage products to offer a one-stop solution for our customer’s power requirements.”

Useful links

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Which material for split-core current transformers: Ferrite, FeSi or FeNi ?

The choice of magnetic material used in a current transducer impacts the cost, size, weight as well as performance aspects such as linearity, phase-shift and stability over temperature. Consequently, the choice of material depends on the application. Split-core current transducers usually use either ferrite, FeSi or FeNi.

FeSi split-core current transformers

FeSi current transformers are relatively low cost but suffer from poor linearity and drift, mainly due to the air gaps induced by the split-core architecture. They are also heavy and bulky – thus, not very suitable for environments with limited space. Poor linearity, especially at low currents, and large phase shift limits the use of FeSI to low cost applications not requiring a high degree of accuracy. A typical application is branch current monitoring in panel boards to detect overload risk and trigger an alarm or load balancing.

FeNi split-core current transformers

FeNi has been the best material for split-core current transformers for a long time, offering good performance, but at a relatively high cost. FeNi offers a good alternative to the FeSi material when accuracy and phase shift are important, or when transformers need to measure small currents. Apart from the price, FeNi current transformers have some other limitations.

Ferrite split-core current transformers

Although ferrite materials have been well known for years, their poor performance in terms of saturation level and magnetic permeability did not allow their use at frequencies as low as 50/60Hz. However, new types of ferrite have significantly improved permeability and can be implemented in 50/60Hz current transformers as a substitute for FeSi or FeNi cores, despite the low magnetic saturation level. Split-core current transformers implementing these new types of ferrite can perform accurate measurement of AC signals in an extended frequency range that includes the 50/60 Hz application domain.

Ferrite provides high accuracy and excellent linearity even at very low current levels. The material also offers low phase-shift between input and output currents. The hard and dense core allows for the minimization of air gaps and, in contrast to FeSi or FeNi, is virtually insensitive to ageing and temperature changes. Ferrite is also available at low cost, which makes high performance split-core ferrite current transformers an attractive choice. However, the large ferrite cores required for higher currents are not easy to manufacture. Consequently, for higher currents FeNi transformers or Rogowski Coils are typically a more appropriate choice.

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PPM Power at the Low Carbon Vehicle Show: Sept 12-13

Millbrook – Wednesday 12th and Thursday 13th September

As usual, PPM Power exhibited at the Low Carbon Vehicle LCV2018 show at Millbrook Proving Ground, run by Cenex. This year’s show took place on Wednesday 12th and Thursday 13th September 2018, attending by thousands of attendees, conference delegates, speakers, VIPs and press.

PPM Power C4-200

PPM Power were in hall 4 with Ray Goodenough, Phil Surman, and Paul Salter present to engage with anybody on the subject of power electronics. On the stand was a running demo of PLECS power simulation software with HIL (Hardware In the Loop) as well as integrated semiconductor modules, film capacitors, advanced programmable power supplies, resistors and high voltage connectors.

See you next year?

If you went to LCV2018 and you didnt manage to see us then please give us a call on 01793 784389, email sales@ppm.co.uk or maybe we’ll just see you next time in 2019!

 

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Kanthal improves already outstanding BA series bulk ceramic resistors

Kanthal has released the BA series of ceramic resistor series into bulk production. The BA series offers a maximum resistance of 1MΩ and voltages up to 20kV.  The series now also includes the new 100 and 200 axial lead resistors.

Excellent performance with bulk construction

Kanthal’s non-inductive ceramic resistors are designed for use in applications requiring high voltage, high energy and high peak current resistors. An inherently non-inductive resistor is produced through the bulk construction, rather than meanders or turns. This enables the uniform distribution of energy throughout the whole ceramic resistor body. The resistors offer the best performance when high peak power and high energy pulses must be managed in a limited volume.

“BA material extends the pulse energy capability of Kanthal’s products into applications requiring high ohmic values, up to 1MΩ”, says Phil Surman – Sales Director at PPM Power. “Space and weight are saved by specifying energy absorption, rather than average power in low-duty applications like inrush current limiting in drive systems.”

Ideal applications

• Electric drives
• Voltage balancing
• DC coupling and filter cap discharge

Even higher resistance levels

The BA resistor series expands Kanthal’s range to include higher resistance levels than are available through its SP and AS materials. BA resistors are designed for high energy and voltage pulse applications that require those higher resistance levels. Also, the maximum continuous operating temperature of 230°C is achieved through the choice of coatings. Kanthal have also produced the new 500BA non-inductive bulk ceramic slab resistor in the same range.

About Kanthal

Kanthal is a high-technology engineering group from Buffalo, USA. Now part of the Sandvik Group, Kanthal is an expert in industrial heating and materials technology. Kanthal has been part of the Sandvik Group for over 20 years and has since become a pioneering brand in the industry.

Useful Links

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LEM introduce 1000A fluxgate current transducer

LEM have introduced the IN 1000-S current transducer as an addition to the fluxgate technology range. The new transducer is operational at 1000A and a maximum temperature of 85ºC. The compact design uses digital domain signal processing for minimal interference and delivers excellent linearity, very low offset and a low noise level over the whole temperature range.

Streamlining design and increasing capabilities

The IN 1000-S combines two separate parts: the measuring head and the electronic treatment. Both parts are integrated into a singular design which allows vertical or flat mounting.

High performance from -40 to +85ºC

The new range of high accuracy current transducers operates with strong performance at a temperature range of -40 to +85ºC. Additionally, the wide operating range also allows for applications including labs, medical equipment, test equipment and for energy measurement.

max measuring resistance versus primary current and temperature – Uc = ±14.25V

Key features

• Accurate to 0.0018%
• Temperature range: -40 to +85ºC
• Operational with DC, AC and pulsed currents
• Vertical or flat mounting

Digital signal processing eradicates interference

Digital signal processing eliminates temperature effects, interference and supply voltage variation. The amplitude and phase are adjusted through calibration of each transducer, so any further interference is eliminated. The IN 1000-S operates with better than 3 ppm linearity over the whole temperature range.

About LEM

LEM are a Swiss power electronics company, in their 47th year of operation. LEM focus on current and voltage transducers.

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ABB announces enhanced IGBTs with up to 30% more current

ABB has announced two new enhanced IGBT modules in a HiPak package, with up to 30% more current. The Trench 3300V and Planar 6500V IGBT modules offer exceptionally high current density and robustness.

SPT+ and Trench technologies combined

Usually, ABB’s Enhanced Planar (SPT+) technology competes with Trench cell IGBTs. However, ABB has combined the two to create a new generation of IGBT cell technology. The results are (1) the Enhanced Trench TSPT+ and (2) the Enhanced Planar SPT++ IGBTs. These devices represent the latest generation of IGBT cell technology, further loss reduction and, as a result, the possibility to increase current density.

These new HiPaks are expected to be released for sale during Q4 of 2018.

SPT++ 6500V 1000A HiPak

The SPT++ technology boosts the rating of the 6500V IGBT from 750A to 1000A and  allows the IGBT module to function with an operating junction temperature of 150°C, with unrivalled robustness. For improved performance in regenerative mode, the diode area has been increased by 20%. This allows a system designer to use a smaller module or eliminate the parallel connection of modules.

TSPT+ 3300V 1800A HiPak

The combination of the very low loss and ultra-rugged SPT+ technology with the latest trench cell design further reduces losses and increases current density. The new device allows for a 20% increase in rated current compared with the previous 1500A generation in the same package. In addition, the new 1800A 3300V HiPak is designed to cope with increased stray inductance.

About ABB

ABB is a global leader in manufacturing high-power semiconductors with over 100 years of experience in power electronics. These key components are found at the heart of many leading ABB technologies, such as high voltage direct current (HVDC) transmission systems, flexible alternating current transmission systems (FACTS) and variable speed drives. Power semiconductors are also central to the development of a more reliable, smarter and greener grid.

ABB’s vast range of power semiconductors will be expanded with the following new products for:

  • Traction
  • Power transmission and distribution
  • Renewable energy
  • Industrial markets.

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MNPC or NPC – best topology for a multi-level inverter?

Mixed-voltage Neutral Point Clamped (MNPC) and Neutral Point Clamped (NPC) modules are power module topologies used in high power applications such as three-phase solar/photovoltaic (PV) inverters and uninterruptible power supplies (UPS). The choice between the two topologies is mainly a question of switching frequency. NPC delivers at higher switching frequencies, while MNPC delivers at lower switching frequencies. However, the threshold frequency between the two is always getting lower and there are other factors to consider…

Advantages of MNPC and NPC power semiconductor modules

MNPC and NPC semiconductor modules have significant advantages when used as as multilevel inverters:

  • Low EMI caused by dv/dt issues
  • High efficiency
  • Reduced stress caused by multiple voltage levels on the DC bus.
  • Low-disturbance input current
  • Lower common state voltage

How MNPC and NPC modules work

When MNPC and NPC modules are used as inverters, the DC voltage can be converted into a variable alternating voltage and variable frequency. Unlike a half-bridge or sixpack topology, these topologies offer an additional voltage level at the output. The potential can also have a status of 0, as well as DC+ and DC-.
At real or active power, these are switched at just 50Hz; therefore, they correspond to the positive or negative sinusoidal half-wave. Usually operated at 8kHz for MNPC and 16kHZ for NPC, the outer switches generate the sine wave so they require only half the blocking voltage capability required for conventional topologies. This is significant because semiconductors with a high blocking voltage capability are slower at switching. MNPC and NPC modules with 600V or 650V components can be operated at higher switching frequencies than, for example, 1200V half-bridges.

MNPC topology

The classic MNPC stage comprises four IGBTs and four diodes. The topology is also known as T-type, or NPC2. The blocking voltage is 600V or 650V for the horizontal (neutral point) switches and 1200V for the outer switches. Some modules come with 1200V and 1700V components. Modules are typically equipped with an NTC or PTC alongside the semiconductors.

NPC topology

Historically called a three-level module (though, confusingly, the MNPC topology also has three levels), the classic NPC stage uses four IGBTs and six diodes. The blocking voltage is 600V, 650V or 1200V.

 

classic MNPC topology (left) and classic NPC topology (right)

So, which is better – MNPC or NPC?

The choice between the two is largely based on the switching frequency of the application, though there are other factors (see the list below). Each topology has better loss characteristics at different frequencies.

NPC allows higher switching frequencies. NPC enables faster switching than MNPC. So above a certain frequency, it makes sense to choose NPC. This depends on the IGBTs used, but as a rule of thumb it was traditionally 16kHz. However, this is getting ever lower and now it is more like 10kHz. Manufacturers have considered discontinuing MNPC but some designers prefer to stick with this topology because they are familiar with it.

NPC allows a little more power. A higher current range due to smaller switches means an NPC can have a higher nominal current rating inside the module. Consequently, NPC allows a little more power.

MNPC makes emergency switch-off easier. Emergency switch-off is easier with MNPC because the switching order is not important. In the case of NPC, the IGBTs must be switched in a particular order – typically the outer IGBTs followed by the inner ones to avoid too much voltage across one of the 600V/650V-rated IGBTs.

It depends (indirectly) on the application power rating. Manufacturers typically offer both types for each power rating. However, higher power applications tend to operate at lower switching frequencies, and vice versa. Therefore, while there is a power rating correlation this is more directly related to switching frequency. For high power ratings such as 500kW or above (e.g. solar inverters), MNPC tends to be the better choice because the switching frequencies are usually quite low (e.g. 4kHz or 8kHz). For lower power applications, NPC makes more sense because the switching frequency is likely to be higher. Higher switching frequencies mean smaller passive components, which save cost, weight and size.

It depends on the input voltage. Even at high power ratings the choice still depends on input voltage. A solar inverter might typically have an input of 1000V, so MNPC is an option. But many designers want up to 1500V, which requires 1700V-rated chips. Since the performance of MNPC semiconductor dies are not as good as NPC dies at 1700V, the NPC topology is a better choice.

Summary of advantages – MNPC v NPC

MNPC

  • Easier emergency switch-off
  • Familiarity (more traditional topology)
  • Best for switching at <10kHz

NPC

  • Allows a little more power (higher current range)
  • Best for switching at >10kHz

 

 

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PPM Power in Electronics Weekly: The pros and cons of Silicon Carbide

Last month Electronics Weekly published an article written by PPM Power colleagues Paul Salter and Joe Petrie on the advantages and disadvantages of silicon carbide (SiC) modules.

Specifically, the article points out:

  • SiC devices offer dramatic improvements over silicon IGBTs in power conversion applications above 600V.
  • SiC-specific packaging is required to facilitate operation at higher frequencies in order to minimise loop inductance and poor performance due to wave propagation effects.
  • SiC-specific gate drivers are needed because silicon IGBTs will not support the switching speed of an SiC device or the rapid fault response time needed to protect an SiC device in the event of a short circuit. Specifically, soft or augmented turn-off is required to reduce spiking and ringing problems.
  • Because of these considerations, SiC is a good choice for new system designs – as opposed to upgrades to existing designs, where the advantages of the technology are less realisable.

You can read the full article on Electronics Weekly’s website here.

Paul Salter – Business Development Manager

Joe Petrie – Marketing Manager

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More Information?

Telephone +44 (0)1793 784389 or email: sales@ppm.co.uk