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Two Devices on a Common Heat Sink

Two Devices on a Common Heat Sink. Thermal Model. The heat sink Thermal Resistance. If the two devices are identical. The heat sink needs to have half of the thermal resistance required for one device alone.

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Two Devices on a Common Heat Sink

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  1. Two Devices on a Common Heat Sink • Thermal Model ECE 442 Power Electronics

  2. ECE 442 Power Electronics

  3. The heat sink Thermal Resistance ECE 442 Power Electronics

  4. If the two devices are identical The heat sink needs to have half of the thermal resistance required for one device alone. If the devices are not identical, the required thermal resistance is the smaller of the two previously computed values. ECE 442 Power Electronics

  5. Example • Specify a heat sink for two identical power devices with a maximum junction temperature of 150C to operate in an ambient temperature of 50C. The power dissipation in each device is 20W and the junction-to-case thermal resistance is 1.5C/W. The thermal resistance of the mica insulators is 0.5C/W. ECE 442 Power Electronics

  6. One device would require RSA = 3.0C/W ECE 442 Power Electronics

  7. Check the Junction Temperature Device #1 ECE 442 Power Electronics

  8. For N devices with Common Heat Sink For the nth device ECE 442 Power Electronics

  9. For n Identical Devices ECE 442 Power Electronics

  10. Example • Repeat the previous example if there are three identical devices that dissipate 10W each. ECE 442 Power Electronics

  11. ECE 442 Power Electronics

  12. Check the Junction Temperature Device #1 ECE 442 Power Electronics

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