(through the back of the rectifier bridge. Radiator and rectifier. Bridge through the pin heat transfer), the back of the rectifier bridge.
Foot thermal resistance. Center;
(2) comparison of the total heat dissipation resistance of the rectifier bridge and through the back of the heat transfer resistance of a.
In fact, the conclusion is also clear that the main heat transfer way of a rectifier bridge is through the radiator on the back of the housing, and that of b is that most of the losses on the rectifier bridge are discharged through the radiator, while the heat loss through other channels (pins and the front of the housing) is very small.
(c) : since the heat dissipation condition of the rectifier bridge is closely related to the heat resistance of the radiator, the heat resistance of the radiator will directly affect the temperature on the rectifier bridge.
(when the rectifier bridge parameter table provided by the manufacturer is about the thermal resistance of the rectifier bridge with radiator), it can only be the thermal resistance of the junction on the back of the rectifier bridge -- shell (Rjc) or the overall junction on the rectifier bridge shell -- shell (in parallel with the thermal resistance on the front and back);
At this point the junction - the thermal resistance of the environment has no reference value, because it is with the radiator thermal resistance and significantly changed <<<<>
> > > rectifier bridge in forced wind cold (but the shell temperature determined by the above two cases in three different analysis and calculation in the form of cooling heat sink), we can conclude: in natural cooling rectifier bridge, we can c. Used to directly. The manufacturer - environment provided by the thermal resistance (Rja), to gauge - bridge rectifier and junction temperature, (which can be easily test design whether we achieve power components temperature - degree derating standard) standard;
For the rectifier bridge - with no - radiator forced - air cooling situation, because in - practical use - rarely used, not too much discussion.
(if - in practice - the situation is involved.), may borrow. Rectifier bridge. Cooling meter. Method;
(for the integral flow bridge using heat. Device. Cooling), (only refer to the manufacturer to give us) the junction - shell thermal resistance. (Rjc), by measuring the rectifier bridge.
In this paper, we discuss the selection of temperature measuring points, the calculation method, and put forward a method, which is feasible in practical application, reliable in calculation and measurement, and the method <<<>