High Voltage category

High Voltage-Current Half Bridge Driver Using IR2153 & IGBT

IGBT based half bridge board has been designed for multiple applications, like induction heater driver, tesla coil driver, DC-DC converters, SMPS etc. High current and high voltage IGBTs are used to serve high power requirements.

IGBT NGTB40N120FL2WG from ON semi and IR2153 from Infineon semiconductor are important parts of the circuit, IR2153 is a gate driver IC including inbuilt oscillator, 40A/1200V IGBT can handle large current. Gate driver circuit works with 15V DC and load supply 60V DC to 400V DC.

High Voltage-Current Half Bridge Driver Using IR2153 & IGBT – [Link]

400V – 5A Power Supply For Brushless Motor Drivers

Although the power supply design is specific to the Brushless Servo Drivers mainly for IPM Modules, the concepts and circuit design may be used for any power supply requires high voltage output up to 400V DC and 5 Amps. The power supply is an unregulated design with an option to allow connection to either 120V or 230V mains and also it can work with lower voltage for audio amplifiers by increasing capacitor value. The design uses fully integrated bridge rectifier, and multiple bus capacitors for low ripple, noise suppression, and provides high current reservoirs. Additionally the dc supply line have bleeder resistor R2 and R3 to drain the large reservoir capacitors PCB, mounted fuse holder provided  for short circuit and over current protections, low ohm NTC used for inrush current at power start up,  C1, C12, TX protects  against turn on/off spikes and EMI noise reduction. This power supply can be used to drive Tesla Coils, Induction heaters, DC Motor drivers, Brushless DC motor driver.

400V – 5A Power Supply For Brushless Motor Drivers – [Link]

A Cost-efficient Super-Cascode SiC Switch

Coping with rapid technological advances and finding efficient energy solutions are the keys for development of power electronics of the future. A new research had been done in North Carolina State University about increasing the efficiency of high-power switches.

Silicon Carbide is a compound of silicon and carbon with chemical formula SiC. It is a wide bandgap (WBG) semiconductor, that allows devices to operate at much higher voltages, frequencies and temperatures than conventional semiconductor materials.

Researchers came up with a high voltage and high frequency silicon carbide (SiC) power switch that could cost much less than similarly rated SiC power switches. This research may guide to new applications in power converters like medium voltage drives, solid state transformers and high voltage transmissions and circuit breakers.

Semiconductor devices like the 15kV SiC MOSFET can lead to great potential applications in high voltage and high frequency power converters. However, these devices are not commercially available and their high cost displaces them from industry competition with other alternatives like the standard IGBT (Insulated-gate Bipolar Transistors) that are widely used, but in the same time they dissipate a lot of energy while switching on and off.

Loss Comparison between Silicon IGBT and SiC MOSFETs
Loss Comparison between Silicon IGBT and SiC MOSFETs

The new SiC power switch, called FREEDM Super-Cascode Switch, contains a series of 1.2kV SiC power devices to produce a 15 kV and 40 mA output that can transcend the 15 kV SiC MOSFET in ease of adoption and cost – since it costs only one third of the estimated high voltage SiC MOSFETs. In addition, this new switch is capable of operating in a wide range of temperatures and frequencies due to its proficiency in heat dissipation, which is considered an advantage in power devices.

FREEDM Super-Cascode SiC Switch
FREEDM Super-Cascode SiC Switch

Since there is no high voltage SiC device commercially available at voltage higher than 1.7 kV, as Alex Huang said – Progress Energy Distinguished Professor, he assures that this solution paves the way for power switches to be developed in large quantities with breakdown voltages from 2.4 kV to 15 kV.

The research took place in North Carolina State’s FREEDM Systems Center which is funded by National Science Foundation. This center’s mission is to modernize the electric grid and mold the generation of leaders by providing all the needed software and hardware tools, funds, and partnerships with Industries. This project had also participated in IEEE Energy Conversion Conference & Expo on September 2016 and it was presented by Xiaoqing Song, a Ph.D. candidate at the FREEDM Systems Center under Huang’s supervision.

More research projects in the same field can be reached at the FREEDM Systems Center website and further details can be found at the university website.

Via: ScienceDaily

9V to 1kV DC/DC converter

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Bob tipped us with his latest project, it’s a 9V to 1kV DC-DC converter using CD4011 IC to produce a square wave and a IRF530 transistor to drive the transformer.

Finally, I have made a new high voltage supply based on an inverter transformer and voltage doubler. It seems to be ok for this job, but it can be used in various other applications so I’m presenting it in a separate entry.

Warning! the device produces high voltage that can be lethal, if you want to build it, please take cautions.

9V to 1kV DC/DC converter – [Link]

Isolated Circuit Digitally Indicates 120-/220-V Line Voltage

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Edward K. Miguel @ electronicdesign.com has published a circuit that has output high when the votlage in input is 220V and output low when the voltage is 110V. This is often useful on motor control and power supply systems.

The circuit illustrated in the figure monitors the ac line and provides a basic output indicating whether it is at 120 V or 220 V, with the output at the transistor collector going low for 120-V and high for 220-V inputs.

Isolated Circuit Digitally Indicates 120-/220-V Line Voltage – [Link]

DIY Arduino Battery Spot Welder

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KaeptnBalu @ instructables.com has build a DIY spot welder based on Arduino board. It is powered from a 12V car battery with enough current capability to solder nickel strips on battery packs. The board generates two short pulses with the first one to be 1/8 of the time of the second one. Pulse time of second pulse is adjustable by the potentiometer and displayed on the screen in mS.

DIY Arduino Battery Spot Welder – [Link]

4 Channel Triac Board

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Opto-Isolated 4-Channel Triac Board (R) is used for fast switching applications. Ideal for switching mains circuits, lights, appliances and small load. Each circuit is effectively isolated with opto-isolators on each channel, TTL inputs control each channel.

  • Trigger input 2-12 VDC
  • Mains supply input 230 VAC or 110 VAC
  • Output 1 A @ 230 VAC (RMS ON STATE CURREN 4 AMPS EACH CHANNEL)
  • Snubber circuit for inductive load
  • Jumper for common cathode ground
  • Box Header connector for connection of control signal
  • Screw terminal connector for Load
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 139 mm x 73 mm

4 Channel Triac Board – [Link]

Dekatron as Internet speed indicator

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spritesmods.com has build a interner speed indicator based on a Dekatron tube, the result is great.

As most electronic engineers and hobbyists do, I have a great respect for the earlier ways of controlling electrons, before it was found out that silicon could be used to miniaturize everything a thousandfold. It is amazing that things like a vacuum, a glow wire and a bunch of strange-looking metal bits can actually do useful stuff. The amazing-ness of it all gets even better if there are visuals involved: while vacuum tubes only have the faint glow of the heater, tubes filled with neon are more interesting because they can be used to display stuff. Nixie tubes are a prime example of those.

Dekatron as Internet speed indicator – [Link]

50,000V High Voltage Power Supply

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by Victor8o5 @ instructables.com:

This high voltage power supply has been designed to output a fixed voltage of around 50kV, it could easily be converted to an adjustable supply by connecting a variac in case of using transformers or by adding some extra circuitry to regulate the power going in. I initially thought about a high frequency PWM to regulate the power going into the capacitors, but I abandoned the idea. I found that adjusting the frequency is enough to make the voltage vary by a significant amount, allowing some control over it, this happens because the flyback must operate at a certain frequency in order to maximize the output.

50,000V High Voltage Power Supply – [Link]

WIFI Mains Power Dimmer / Switch

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MAINS Power Dimmer / Switch Module project by Tracker J:

Now it’s about time to talk also about what many of you has asked for: DIMMING!
It’s a total different story, little bit complicated but, as you will see, not so hard to understand.

General considerations:
There are several types of dimmers generally available. These are used for resistive, and inductive loads, such as incandescent,cold cathode and low voltage (inductive) lamp sources. Note that not all electronic transformers used for low voltage lamps are suitable for dimming by Triac or Thyristors dimmers. In case of Thyristors you need 2 of them as Thyristor is a Unidirectional device and because AC power flows in both directions!

WIFI Mains Power Dimmer / Switch – [Link]