The quality of heat dissipation conditions is an important factor that affects whether the module can work safely. Good heat dissipation conditions can not only ensure the reliable operation of the module, prevent the module from overheating and burn, but also improve the current output capability of the module.
In use, when the heat dissipation conditions do not meet the specified requirements, such as the room temperature exceeds 40℃, the outlet wind speed of forced air cooling is less than 6m/s, etc., the rated current of the module should be reduced immediately, otherwise the module will exceed the junction temperature of the chip. The allowed value is damaged. For example, when air-cooled modules should be adopted and self-cooling is adopted according to the regulations, the current rating should be reduced to 30-40% of the original value. On the contrary, if it is changed to water cooling, the current rating can be increased by 30 -40%.
Reference standard for heat dissipation effect: make the temperature of the bottom plate of the module not exceed 80℃: The simplest method can be to install a temperature switch of 75℃ on the surface of the radiator near the module.
In actual application, the following points should be noted:
(1) The wind speed of the axial flow fan should be ≥6m/S.
(2) If the module cannot reach full load, the length of the radiator can be reduced.
(3) Before turning on the device, check whether all the screws of the module are firm. If they are loose, they should be tightened so that the bottom plate of the module and the surface of the radiator, as well as the electrodes of the module and the wiring terminals can be in close contact to achieve the best heat dissipation effect. .
(4) When natural cooling is adopted, the air around the radiator must be able to flow naturally.
(5) Because of the good heat dissipation effect of water cooling. If there are water cooling conditions, water cooling should be the first choice.
