Heat Pipe Cooler

COUGAR ELECTRONICS provides high performance heat pipe coolers for a wide range of electronic applications going from boards to power converter. Understand better by this page how this technology can solve most of your thermal management issues.

General principle of heat pipes

Heat pipe coolers use heat pipes’ effect in order to carry on calories from one area to another with an extremely high thermal conductivity.

They are generally made up of 3 elements :

  • Evaporating plate : metal plate in contact with the electronic component to cool. The plate’s configuration adapts itself to the geometry of the component (dimensions, drilling, surface’s treatment).
  • Heat pipes : assembled with the evaporating plate, they carry on calories from evaporating area onto the condensing area. Their diameter ans their position vary depending on the power to extract.
  • Condenser area : it can be made up with metal fins that allow the dissipation of calories into a fluid (generally air) or a plate in contact with a colder surface.

At similar dimensions, thermal conductivity of heat pipes are 1000 better than copper and 1700 better than aluminum ! This exceptional property allows heat pipe cooler excellent cooling properties.


Technical datas

  • Dissipated power : 1W to 30kW
  • Working temperatures :-50°C to +200°C
  • Thermal resistance: 5 to 40°C/kW
  • Dissipation : Natural convection / Forced convection / Contact


  • Performance (better than any heat sinks)
  • Independence system : none maintenance necessary
  • Compactness
  • Lightness
  • Lifetime > 30 years
  • Extraction of calories from confined environment


  • Power Electronic
  • Railway
  • Aerospace / Defence
  • Telecommunication
  • Medical
  • Hot spot management

Low Power Heat Pipe Cooler

Heat Pipe are commonly used to cool microprocessor on computers. This is a very interesting solution to cool low power electronic semiconductors like :

  • Peltier Thermoelectric modules
  • Power supply semiconductors
  • LED light
  • CCD video sensor
  • Laser diode
  • Microprocessor

Drain heat pipe can be custom designed following your need to extract the heat from the hot spot and avoid too much thermal dissipation in the ambient temperature of the container. Remember that controlling the temperature of your components is also controlling their life time, and thus their reliability.

COUGAR ELECTRONIC low power heat pipes can cool power losses from 1W to 500W, depending on the configuration of your application.

High Power Heat Pipe Cooler

Heat pipes cooler for high power electronics can evacuate from 500W to 30kW. This technology can bring low thermal resistance and big cooling capacity without the need of any water circulation pump.

Our sister company CECLA METAL PROCESS, is leader in production of big diameter heat pipes for power cooling application.

Based on high section heat pipes, those coolers allow to evacuate losses created by power components such as IGBT, Press-Pack…

The cooler can be designed to fit to your need :

  • Component’s contact plate adapted to your topology of semiconductor
  • Dissipation’s fins sized depending on the available area, the fluid and the flow.
  • Mechanical interface made up depending on your application mounting

Heat pipe coolers can be working with forced convection or natural convection.

An electrical insulation up to 15kV can be added on the component’s interface by integrating ceramic or resin.

Typical example of use:

  • Cooler for Railway auxiliary converter (CVS)
  • Cooler for power electronics in contained atmosphere
  • Air/Air exchanger for overheated atmosphere inside cabinets

Heat Pipe tube

If you wish to build your cooler by yourself, or want to try the technology for a prototype, COUGAR ELECTRONICS has a range of standard heat pipe tubes.

The standards heat pipe tubes can convey from 10W to 500W per tube depending from the diameter and the gravity orientation.

Heat pipes tubes can be added in parallel in order to convey more heat or achieve a better homogeneity :
Example: if you need to cool a semiconductor with 120W losses => your possibles solutions are :

  • 4 heat pipes D5Lxxx : 120W/30W per pipe = 4 pipes
  • 3 heat pipes D6Lxxx : 120W/40W per pipe = 3 pipes
  • 2 heat pipes D8Lxxx : 120W/60W per pipe = 2 pipes

The final choice between those 3 solutions will depend from the size of the semidonductor and the mechanical configuration.

Check in the table below which reference is the best one for your need. We will be happy to assist you in the best choice to make.

Heat pipes tubes are made of soft copper: thus they can be bent to achieve complex shapes. Generally the maximum bending radius allowed is between 2 and 3 time the diameter.

COUGAR ELECTRONICS can perform the bending following your drawing.

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  Length (in/mm)
Diameter (in/mm)Max Power rating per tube (W)3.94in / 100mm5.90in / 150mm7.87in / 200mm9.84in / 250mm11.81in / 300mm13.78in / 350mm15.75in / 400mm17.71in / 450mm
0.12in / 3mm10WD3L100D3L150D3L200D3L250----
0.16in / 4mm15WD4L100D4L150D4L200D4L250D4L300---
0.20in / 5mm30WD5L100D5L150D5L200D5L250D5L300D5L350--
0.24in / 6mm40WD6L100D6L150D6L200D6L250D6L300D6L350D6L400-
0.32in / 8mm60WD8L100D8L150D8L200D8L250D8L300D8L350D8L400D8L450
0.39in / 10mm70WD10L100D10L150D10L200D10L250D10L300D10L350D10L400D10L450
0.62in / 15.87mm250W to 500WCustom made on demand
Diameter tolerance: +/-0.5mm +/-0.02in
Length tolerance: +/-1.5mm +/-0.6in
Power rating is indicative: this parameter can vary from delta T, gravity orientation, bending radius

Heat Pipe Cooler

The technology

Selenium rectifiers and suppressors are still used in the industry for their strong reliablity. This technology has been mainly replaced by silicon diodes, providing a better efficiency and lower voltage drop. Selenium components are very interesting for their reliability. Those components have the ability to recover after surge failure, which make them excellent for security applications. COUGAR ELECTRONICS has been one of the leading company in the 50's. We are the last firm still manufacturing parts made in USA thanks to our CT factory.

Elevator industry, Military and power generation

Despite most of our business is now focused on up to date semionductors like silicon diode, thysirtors, IGBT and SiC, our manufacturing department is serving elevator industry (otis, schindler, kone, thyssen krupp). We also serve specific fields like military or power generation application .

Service and Fast delivery

Our excellence in organisation, allow us to serve after-sales service with exceptional fast deliveries :
  • same day shipping
  • next day shipping

Looking for a part, call us !

If you look for a specific part number, or even if you do not have part number. Do not hesitate to call us. We build and design any type of selenium rectifier or selenium suppressor. Do not give up, thinking these components are impossible to find. We are here to help ! [caption id="attachment_2376" align="alignnone" width="282"]selenium rectifier selenium rectifier[/caption] [caption id="attachment_2370" align="alignnone" width="297"]Selenium7 Rectifier 3 phases[/caption] [caption id="attachment_2369" align="alignnone" width="210"]Selenium Suppressor Surge Suppressor[/caption]

Troubleshooting a selenium rectifier or suppressor

Our customer service will be happy to help you to determine what's the best solution.

Find parameters for rectifiers :

  • Voltages: Standard Voltages per cell up to 36 v rms. The voltage rating is determined by the number of cells in series
  • Current: Ratings are determined by the size of the cell or the number of cells in parallel. The circuit configuration and the type of cooling are also important factor to consider.
  • Circuits: Half wave, Doublers, Center Taps, Full Wave Bridges, single and three phase.

Find parameters for suppressors :

  • Ratings: Determined by the cell size and number of cells in a series (similar to rectifiers above).
  • Suppressors are also rated by the voltage clamping factor and the amount of reverse energy they can absorb (in joules).

More information about our product

[embed]https://cougarelectronics.com/cougar-electronics/power-conversion-components/selenium-rectifier-suppressor/#[/embed] https://en.wikipedia.org/wiki/Selenium_rectifier