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New 100kV portable HV probe from North Star

 

North Star have added a 100kV model to their PVM series of high voltage probes which offers 0.1% DC accuracy at 100kV, a fast rise time and bandwidth up to 80MHz.

PVM100 specification

Max DC / Pulsed (kV) Max Freq (MHz) Cable Imp. (Ω) DC – 2Hz 2 Hz – 200 Hz 200 Hz – 5 MHz > 5 MHz Input R/C (MΩ/pf) Divider Ratio Length (inches/cm)
100/150 80 50 <0.15%  <1.5%  <2%  <6% 600/15 2000:1 23/57

Portable HV probe

In contrast to the physically more stable VD series, the PVM series are portable probes designed for general use where portability and ease of use are essential. They deliver an exceptionally high frequency response in applications such as:

  • Automotive ignition
  • Excimer laser system measurement
  • EMI measurement.

Factory calibrated

PVM probes are intended for use with 1 MΩ oscilloscopes, but are also available with an optional switch which can compensate for various measurement instruments such as 10MΩ meters. The units are factory calibrated and do not require adjustment.

Useful links

PVM Series of HV probes

High voltage probes and meters

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PPM Power now supplying Vincotech power modules

PPM Power is now supplying Vincotech power semiconductor modules in the UK. Formerly part of Tyco Electronics and now an affiliated company within Mitsubishi Electric Corporation, Vincotech is a market leader in power modules for motor drives, solar inverters, welding equipment and power supplies.

Highest integration available

“Vincotech modules offer the highest level of integration available in the market, housing dies fabricated using different semiconductor technology,” said Phil Surman, Sales Director at PPM Power. “This provides the best combination of cost and performance. We are very excited about supplying these products to our UK customers.”

Wide portfolio of power modules

Vincotech currently manufactures nineteen different types of power module, including half-bridge, sixpack, booster and power factor correction (PFC) modules. Rectifier modules with integrated brake resistors are also available, as are sixpack modules with integrated rectifiers. Vincotech uses multiple package families, including flow, MiniSKiiP and VINco. Substrate materials include aluminium nitride (AlN) and silicon nitride (Si3N4), which deliver high thermal conductivity.

Vincotech innovation

Innovations from Vincotech include:

  • Sintered die attach replaces all soldered points with sintered connections and allows multiple components to be sintered together.
  • Pre-applied phase-change material supports high thermal conductivity between a power module and heatsink but is solid at room temperature, making it smear-resistant during transportation and assembly.
  • Press-fit pins create a gas-tight, cold-welded connection, which reduces assembly time by eliminating the need for soldering. Solder pins are also available.

Simulation environment

Vincotech also supplies a simulation environment, which allows the user to develop an insight into how parameter adjustments affect losses, temperatures and efficiency.

Useful links

Integrated Power Modules

MiniSKiiP Integrated Power Modules (IPMs)

E3 (Econodual) Integrated Power Modules (IPMs)

Power semiconductors

 

 

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New Genesys+ programmable DC – better performance and functionality

TDK-Lambda has launched the Genesys+™ series of programmable DC power supplies, which uses digital signal processing (DSP) technology to deliver efficiencies of up to 93%, as well as better performance and functionality than the existing Genesys range.

Improvements

  • Programmable control pins
  • Waveform profiles
  • Faster programming response times
  • More advanced master/slave operation.

Same communication protocols

The new series is compatible with Genesys™ and Z+ models, using the same communication protocols and signals. All functions can be programmed from the front panel or remotely. An isolated analogue control and monitoring interface is also provided.

Features

  • Constant current, constant voltage or constant power modes
  • Internal resistance simulation
  • Accepts three-phase 170-265Vac, 342-460Vac or wide range 342-528Vac inputs
  • 1U high, 19″ (483mm) wide rack
  • Five models: 0-10V/500A to 0-600V/8.5A.

Genesys+ 1U Series

Model Output Voltage VDC Output Current (A) Output Power (W) RMS Voltage Ripple RMS Current Ripple Ripple+Noise (p-p) (mV)
G10-500 0 – 10 0 – 500 5000 8 700 75
G20-250 0 – 20 0 – 250 5000 10 300 75
G30-170 0 – 30 0 – 170 5100 12 150 75
G300-17 0 – 300 0 – 17 5100 60 7.5 200
G600-8.5 0 – 600 0 – 8.5 5100 100 4 480

Useful links

Useful documents

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Genesys+ 1U Datasheet

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Genesys+ 1U Brochure

 

 

 

 

 

 

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New parametric search for rectifiers

Dean Technology has launched a parametric search tool for rectifiers. Checkboxes allow a user to include or exclude components from the search results based on rectification-type and package-type.  Sliders can then be used to limit the range of results based on:

  • Repetitive peak reverse voltage
  • Average forward current
  • Maximum forward surge current
  • Maximum forward voltage drop
  • Maximum reverse recovery time

The advanced search can be accessed here:

Parametric searches for suppression products and capacitors will be available soon. PPM will also be launching a parametric search for semiconductor products.

Useful links

Power semiconductors

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Bulk ceramic resistors vs film and wire-wound

Non-inductive bulk ceramic resistors are capable of handling extremes that film and wire wound resistors cannot. Ceramic technology offers the power range and non-inductive characteristics of film resistors but with overload and pulse energy capabilities that exceed the performance of wire-wound resistors – in a fraction of the footprint.

From soft-start and snubber circuits to dynamic braking and RF dummy loads, non-inductive bulk ceramic resistors have a wide range of applications, such as: radar, motor drives, broadcast transmitters, RF amplifiers, semiconductor process equipment, high voltage power supplies, switchgear, X-ray, lasers, medical defibrillators, and energy research. Electronic systems often require rugged resistors that perform reliably under conditions of high voltage, current, or energy.

Pulse, pre-charge and soft-start

The compact pulse energy capability of ceramics allows flexible design without sacrificing power. Ceramic resistors can obtain greater power dissipation in one third of the footprint of wire-wound resistors, delivering excellent performance where high peak power or high-energy pulses must be handled in small and efficient spaces.

Resistor technology comparison

Parameter Wire-wound Film Ceramic
Inductance (nH) 30-56000 2-200 2-200
Peak power Poor Poor Excellent
Overload Medium Poor Excellent
Pulsed energy Medium Poor Excellent
Geometry size Complex packaging Flexible Flexible
Power range 5 W to 1 kW 1 W to 1 kW 1 W to 1 kW

High voltage

High voltage continuous and pulse applications can be addressed with ceramic resistors, including include crowbars, capacitor charging or discharging, and high voltage power supply protection circuits. Bulk ceramic resistors can provide low inductance, high average power per unit size, stability at high voltage, and durability at extreme peak-power levels.

Snubber circuits

When a spike in voltage occurs from electrical switching, an RC snubber circuit is typically used to suppress the discharges and protect the circuit. However, a wire wound or film resistor may not hold up to the high voltage, current or energy conditions. The power spike can result in megawatts of instantaneous peak power which could cause a small mass of film or wire-wound resistors to degrade and even fail.

High-frequency filters

Bulk ceramic resistors are used extensively for high-frequency loads in broadcast and communication equipment because of their non-inductive characteristics. They provide excellent non-inductive power-handling capacity at frequencies into the GHz range, with no sacrifice in power dissipation. In advanced digital applications such as digital radio and HDTV transmitters involving pulses at high frequencies, the small size, flexibility and overload reliability of ceramic resistors are ideal.

Test loads

High energy may be desired in a testing situation, from addressing minor circuit spikes to the diverting a lightning strike. In the case of power generators, test loads allow for a low-risk verification of a unit’s capabilities.

Useful documents

Kanthal tubular resistors datasheet

Tubular Resistors Datasheet

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Axial-leaded Resistors Datasheet

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AS Series Slab Resistors Datasheet

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SP Series Slab Resistors Datasheet

pdf-icon

Series 900 Disk and Washer Resistors

 

 

 

 

 

 

 

Useful links

Resistors

Ceramic resistors

 

 

Posted in Resistors | Comments Off on Bulk ceramic resistors vs film and wire-wound

EBG replacements for obsolete TT Electronics HV resistors

PPM Power can supply EBG alternatives to the high voltage resistors that TT electronics has decided to make obsolete.

  • Precision high voltage planar resistors (PHP series)
  • High voltage thick film resistors (HV31-HV35 )
  • High voltage low inductance thick film resistors (HVL43-HVL45)

EBG replacements for TT Electronics obsolete HVL series

TT Electronics part Power rating (W) Voltage (kV) Min resistance (kΩ) Max resistance (GΩ) EBG alternative Power rating (W) Voltage (kV) Min resistance (Ω) Max resistance (Ω)
HVL 43 1.5 4 1 1 OSX 26 1.95 4 100 10G
HVL 44 3.5 14 1 2 SOX 52 3.4 16 400 10G
HVL 45 5 24 1 4 SOX 78 5 24 600 10G

EBG replacements for TT Electronics obsolete HV series

TT Electronic part Power rating (W) Voltage (kV) Min resistance (kΩ) Max resistance (MΩ) EBG alternative Power rating (W) Voltage (kV) Min resistance (Ω) Max resistance (MΩ)
HV31 0.5 1 1 50 OGP 13 1 1.5 100 50
HV32 0.75 2 1 100 OGP 20 1.5 2 200 100
HV33 1 4 1 150 SOX 20 1.2 5 300 10
HV34 1.25 7 1 200 SOX 26 1.6 7.5 450 10
HV35 1.5 10 1 250 SOX 39 2.5 11 500 10

EBG replacements for TT Electronics obsolete PHP series

TT Electronics part Power rating (W) Voltage (kV) Min resistance (kΩ) Max resistance (GΩ) EBG alternative Power rating (W) Voltage (kV) Min resistance (Ω) Max resistance (GΩ)
PHVP5 1 5 1 3 FBX8/5 1.6 6 200 2
PHVP7 0.8 7 1 1 FEX4/5 0.8 9 200 2
PHVP7B 1 7 1 2.5 MTX 967.3.25 1 8 10 30
PHVP10 1 10 1 1.5 MTX 967.3.38 1.5 10 10 30
PHVP10B 1.3 10 1 3.5 MTX 967.3.38 1.5 10 10 30
PHVP10C 2 10 1 7 MTX 967.10.25 2 10 10 30
PHVP15 1.5 15 1 4 MTX 967.15.38 3 15 10 30
PHVP15B 2 15 1 5 MTX 967.15.38 3 15 10 30
PHVP15C 3 15 1 10 MTX 967.15.38 3 15 10 30
PHVP20 2 20 1 7 MTX 967.5.51 2 20 10 30
PHVP20B 3 20 1 10 MTX 967.10.51 2 20 10 30
PHVP20C 4.5 20 1 20 MTX 967.15.51 4.5 30 10 30
PHVP30 6.5 30 1 30 MTX 967.25.99 10 35 10 30
PHVP40 9 40 1 40 MTX 967.25.99 10 35 10 30

Useful documents

pdf-icon

MTX967 series datasheet

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OGP series datasheet

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OSX/SSX/SOX series datasheet

pdf-icon

MTX967 series datasheet

 

 

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EBG extends two more resistor series up to 2000W

EBG has extended two more ranges of its ultra-high power resistors up to 2000W. The UXP series already included the UXP2000.  Both the ULX and UTP series have now been extended to include 2kW variants. EBG’s ultra-high power resistors are used for demanding applications, such as variable-speed drives, power supplies, control devices, robotics and motor control.

ULX, UPT and UXP resistors series

Stability and improved heat transfer

EBG use their own METOXFILM technology for stability at high power and during pulse loading as well as alumina ceramic metalized with special ALTOX film on the base for improved heat transfer and optimum discharge. The resistors are encapsulated in a resin-filled epoxy casing with large creeping distance, a large air distance between terminals and a high insulation resistance. The technology is designed to deliver low inductance and capacitance at high power.

One package – three resistors

EBG ultra-high power resistors allow up to three resistors to be integrated into a single package, enabling power to be shared across more than one resistor in addition to saving space and cost.

Features:

  • Tolerance range: ±10 % to ±5 % (tighter on special request)
  • Resistance value ranges from 0.1 Ω to 1.5 MΩ (higher values on request)
  • Non-inductive design
  • High insulation and partial discharge performance

Custom designs available

Many customers using EBG’s ultra high power resistors have custom designs to fit their application.  Parameters such as tolerance, resistance value and mechanical design can be modified to suit individual requirements. The resistors feature an easy mounting fixture to ensure an auto-calibrated pressure to the cooling plate of approximately 120 to 160 N. Materials comply with ROHS and UL94-V0 regulations.

For more information, please contact PPM Power on 01793 784389, sales@ppm.co.uk or use our website chatbox.

Posted in Resistors | Comments Off on EBG extends two more resistor series up to 2000W

Pre-applied phase change material for bonding semiconductor modules

The thermal transfer between a power semiconductor module (e.g. an IGBT or SiC module) and a heatsink is critical to achieving high power densities and avoiding failures in the field. Using phase change material rather than thermal grease as an interface achieves much higher conductivity. Furthermore, pre-application by the manufacturer ensures a uniform layer of optimal thickness and consistency which maximises performance, ease of manufacture and repeatability.

Rear side of a Vincotech module with pre-applied phase change material 

Dissipating thermal energy

The thermal energy generated by a power semiconductor die must be dissipated to avoid exceeding the maximum junction temperature (Tj max) and consequential damage. Poor mounting of a power module also risks failures in the field. Maximising the heat dissipation by minimising the thermal resistance between the module and the heatsink is typically achieved by bonding the two using a thermal interface material.

Thermal Interface Material (TIM)

The main role of a thermal interface material is to maximise the heat transfer by filling cavities on the power module and levelling out unevenness on the heatsink. This eliminates air gaps which act as thermal insulators to achieve an effective bond between the top of the heatsink and the bottom of the power module.

TIM conductivity versus grain and layer characteristics

Conductivity is highly dependent on the size, shape and distribution of the grains in the filling material. Smaller filler grains are able to fill small surface irregularities to reduce the contact resistance and lowers the thermal resistance (Rth). However, larger particles result in a high specific thermal conductivity. The optimum thickness of the TIM layer depends on the module size and technology. The layer should be as thin as possible but as thick as necessary.

What is thermal grease?

Thermal grease, often referred to as heat paste, heatsink compound or thermal compound basically consists of two components:

• a carrier material
• a filling material

Typical carrier materials include an epoxy, silicone, urethane or an acrylate. Fillers such as aluminium nitride, aluminium oxide, boron nitride or zinc oxide are thermally conductive but electrically insulating. A thermal grease compound can be as much as 80% filler.

Phase change material (PCM)

A phase change material changes state without a change in chemical composition. In the case of a semiconductor thermal interface material, the PCM changes from solid to liquid and back to solid when crossing the phase change temperature – approximately 45°C. Above the phase change temperature the material becomes thixotropic – i.e. viscous under normal conditions but less viscous when stressed. Thus, the PCM will spread across the area in contact with the heatsink, creating an even layer between the two surfaces but not flow when heated during power up of the module. Once solidified, there is no risk of smearing and a module requires no special care during transportation, handling and application.

Advantages of PCM

• PCM is fluid during the application and dries out over time and temperature.
• Compatible with press to fit pins
• Can be used with a standard solder profile such as J-STD-001, J-STD-003
• Reduced thermal resistance
• Reduced risk of substrate cracking

Comparison of thermal interface materials

Property Std thermal grease High perf. thermal paste Si-free thermal grease Phase change material
Density at 25 °C (g/cm3) 2.1 4.2 2.1 – 2.3 2
Dielectric strength (kV/mm) 10 3 20 N/A
Thermal conductivity (W/m*K) 0.81 2.5 2.5 3.4

Benefits of pre-application of PCM

Having phase change material pre-applied means streamlined production – i.e. a reduced number of manufacturing operations. This is also relevant to the design process during which a TIM layer would need to be manually applied. A screen-printing process applies a more uniform thickness and consistent quality of TIM than can be achieved manually with a squeegee, roller, brush or putty knife. Uniformity avoids increased thermal resistance due to the layer being too thin or too thick.

Conclusion

For high voltage semiconductor modules such as IGBT and SiC modules, phase change material offers significant performance benefits over traditional thermal grease as an interface material. Furthermore, pre-applied PCM ensures optimal thickness and consistency whilst reducing the number of operational steps in manufacture.

References

  1. Thermal Management Technology for IGBT Modules – Yoshitaka Nishimu, Mitsukane Oonota, Fumihiko Momose
  2. Maximizing Precision in Thermal Interface Layers – Martin Schulz, Infineon Technologies, Article Bodo’s Power Systems 01/2013
  3. The importance of correct IGBT module mounting procedures – Stuart Europower Components, July 20, 2016
  4. Reliability Testing Of Thermal Greases  – Arun Gowda
  5. Advantages of pre-applied Thermal Interface Material for power modules – Mirko Haardt, Field Application Engineer, Vincotech
  6. Vincotech’s modules with pre-applied phase-change material – Patrick Baginski, Field Application Engineer, Vincotech GmbH
  7. Application Note THERMAL PASTE APPLICATION AN10001 – Dieter Esau, 2010/03/30

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PPM Power Signs Agreement with SanRex to Supply Silicon Carbide Power Modules

PPM Power, specialist supplier of power electronics, high voltage and pulse power components has signed an agreement with Japanese manufacturer SanRex to distribute their power semiconductor modules in the UK. As well as the new silicon carbide (SiC) based MOSFETs, SanRex also manufacture schottky diodes and thyristor modules operating up to 2200 Volts and 500Amps. Typically these power modules are used in applications such as welding, induction heating, motor drives, battery chargers and grid connected inverters.

Best-in-class die technology and compact rugged packages

“Silicon Carbide MOSFETs have offered compact, high speed, very low loss power switching for a while now,” says Phil Surman – Sales Director at PPM Power. “SanRex have developed their own best-in-class die technology as well as compact, rugged transfer-moulded packages that deliver the next leap in performance at a system level. With silicon carbide MOSFETs and silicon based diode modules from SanRex, PPM Power now has semiconductor product offerings for mainstream power electronics as well as very high performance applications.”

About SanRex Corporation

Established in 1982 to support customers in The Americas and Europe, SanRex Corporation is a wholly owned subsidiary of Japanese company Sansha Electric. In addition to power semiconductors the company also manufactures plating rectifiers, lighting ballasts and plasma power supplies. SanRex is headquartered in Port Washington, New York.

About PPM Power

PPM Power has been serving the UK power electronics market since 1994. The company supplies a broad range of products from high voltage switches, resistors, capacitors and diodes to programmable power supplies, pulse transformers and simulation software. PPM Power is a division of Pulse Power and Measurement Ltd. which also manufactures RF over fibre systems used in applications such as satellite communication and electromagnetic compliance (EMC) testing of aircraft. The company is based in Swindon, UK.

PR Contact

Joe Petrie
Marketing Manager
Pulse Power & Measurement Ltd
T: +44 (0)1793 784389
F: +44 (0)1793 784391

E: sales@ppm.co.uk

W: www.ppmpower.co.uk

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Best-in-class HV DC power supply – free 14-day trial

Heinzinger have expanded the production of their “best in class” EVO series of high voltage DC power supplies and are delivering new types from stock. Desktop/rack mount units are available up to 10kV and 3000W. Voltage classes 1.5kV, 5kV and 10kV are already in production.

Compared to an equivalent 3kW regulated DC power supply, the EVO is approximately half the weight, half the size and delivers double the stability of line and load regulation – for a lower price.  A 14-day, no obligation trial period is available for customers to test the units.

Features & Options

Standard features:

  • Overvoltage and overcurrent protection
  • Limit functions for voltage and current
  • Interlock function
  • Easily configurable diverse I/O contacts
Optional functionality:

  • Ramp function
  • Arc detection
  • Fast discharge circuit
  • Electrical polarity reversal

Fully digitally regulated, best in class performance

Fully digitally regulated system based on a microcontroller and supported by an FPGA for measurement routines delivers outstanding speed and accuracy. The system is easily configured and is equipped with a huge variety of pre-configured settings. Standard units deliver an accuracy and stability class of 100 ppm. Optional high precision units provide an overall accuracy better than 10 ppm.

Customize to different loads

EVO high voltage power supplies can be customized to different load scenarios by configuring the regulation loop parameters.

Active power correction

The active power factor correctioninput stage meets multiple harmonic distortion standards, eliminating concerns with internal and external energy providers and minimizing interference in a lab environment. Units up to 3000 Watts are equipped with a single phase input@230V nominal ac voltage. The wide-range input allows voltages from 108 – 253 Vac.

Intuitive menu and extensive event memory

Backlit 3.5″ colour TFT screen ensures excellent readability of data and uses an intuitive menu for navigation. Well-designed sub-menus create a clear view in any operating condition. Access to sub-menus can also be protected using a numerical code. The units also have an extensive error and event memory file with time tags.

Communication interfaces

  • Designed for “plug and play” operation
  • Ethernet and RS232 using SCPI
  • Easy-to-use, basic web browser
  • Optional analogue interface

Practical chassis design

The enclosure can be used as a standardized 19″ chassis for industrial applications or a high-grade desktop device in a laboratory. No necessity for additional adaptors, which are never found when needed. The conversion from 19″ to desktop is achieved by modifying the position of two screws. Also, the air inlet grill can be equipped with an additional filter pad which can be changed easily from the front without tools.

Free software updates for 1 year

Software updates can be made using a special service plug on the rear side. Performance upgrades or updates for additional functionality are free for a year.

Useful links

Heinzinger EVO product page

All power supplies

High voltage programmable power supplies

Posted in Power Supplies | Comments Off on Best-in-class HV DC power supply – free 14-day trial

More Information?

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