Water Cooling Cold Plates

COUGAR ELECTRONICS is able to design with any type of water cooling cold plates. Liquid cooling plates are generally considered as the most efficient solution for high power and high flux density. However this solution is not passive and needs energy to supply the pump.

General principle

The loop of the working fluid is an assembly of the following components :

  • Liquid cold plate : in contact with the components to cool
  • Pump
  • Expansion tank
  • Liquid/air exchanger

The working fluid is generally a mix of water and glycol, or a dielectric oil. Circulation of the liquid is made by the pump and the expension tank.

Cold plate allowed the fluid to flow close to the electronic components. Turbulators can be set up inside the plate to reinforce thermal exchange in the active area.

Heated liquid dissipates calories in the air thanks to thermal exchanger, before starting for a new cycle.

Our sister companies CECLA METAL PROCESS and ARCEL are experts in designing and manufacturing cold plates.

Several technologies can be proposed for your application.

Standard design for Press Pack Stacks


  • Material: Copper CuA1
  • Hockey Puck diameter: max 48mm
  • Nickel Plated
  • Length: 1,97in / 50mm

WP7 Data Sheet


  • Material: Copper CuA1
  • Hockey Puck diameter: max 48mm
  • Nickel Plated
  • Length: 1,97in / 50mm

WP9 Data Sheet


  • Material: Copper CuA1
  • Hockey Puck diameter: max 75mm
  • Nickel Plated
  • Length: 7,87in / 200mm

WPAL200 Data Sheet

SIM63 Electrically Insulated Cold Plate

  • Material: Copper CuA1 or Aluminium
  • Hockey Puck diameter: max 75mm
  • Nickel Plated
  • Length: 7,87in / 200mm

SIM63 Data Sheet

Standard design for IGBT


The ultimate thermally efficient and cost competitive solution for IGBT cooling !

  • Material: Extruded Aluminium
  • Water blade concept
  • Double sides use
    • Compatible IGBT on main side
      • ECONOPACK+
    • Compatible modules on second side
      • Diode module
      • ISOTOP housing
      • 80mm pitch module
  • Surface finishing: raw, nickel, anodization…
  • Length: following your need !

The WPM design started from this noticing: all the cheap extruded cold plates are designed with basic round channels. Those solutions are cheap but do not lead to very thermally efficient cooling.
WPM is using the unique water blade concept: the water flows in one layer on all the width of the semiconductor, creating the perfect balance between turbulence and pressure drop.
You get a high thermally performing solution, with a the very competitive price of the extrusion !

WPM Data Sheet

Custom design cold plate

An engineering team dedicated to your need

We are specialists in the design of water cooled solutions. Our engineering team has more than 20 years of experience in the field for designing innovative solution dedicated to the success of your projects !

We are using the latest 3D and thermal numerical simulation tools to insure the performance of our product before manufacturing.

Drilled Cold Plate

The base plate is drilled with orthogonal and parallel channels. The liquid flows in the channel network. Impermeability is achieved by the use of screwed or welded caps.

This technology can be advised for the following cases :

  • Small dimensions <20in
  • Low quantities

Tubular Cold Plate

Tubular cold plates are made with the assembly of a bent tube and a base plate. The electronic components are set up on the base plate.

Tube can be made of the following materials:

  • Aluminium
  • Copper
  • Stainless steel

Brazed Cold Plate

Aluminium brazing allowed to make very smart assemblies of aluminium parts, by fusion of local aluminum braze filler. This process is generally made in controlled or vacuum atmosphere. Brazed cold plates are very interesting for complex and efficient applications. This process is now becoming more and more affordable.

A fluid channel is milled on a base plate, following components map. Turbulators can be integrated under the components to reinforce the thermal exchange and temperature homogeneity.

A cap is brased on the milled face in order to make the cold plate hermetic.

This technology is adapted for the following applications:

  • Medium and mass series
  • Complexe and efficient applications

Water Cooling Cold Plate

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