the internal structure of cpu modules plc Analysis

the internal structure of cpu modules plc Analysis
cpu modules plc as a power components, widely used in various power equipment. Its interior is mainly composed of four diodes of the bridge to achieve the input AC voltage to a DC output voltage.
Each working cycle in the rectifier bridge module, at the same time to work with only two diodes, the diode conducting the single function, cpu modules plc converting the AC voltage into a DC pulsed way.
Commonly used for low power rectifier  high-speed counter modules bridge anatomy will find its internal structure as shown in the full-wave rectifier bridge plastic package (most of the small power of the rectifier bridge is used package). Four main heating components within the bridge - diodes are divided into two groups were placed on a copper current output pin. In between there are two DC output connector pin copper copper, they were with the input pin (AC input wires) connected to form what we see in the  plc sequence of events module appearance of four external connection pin full-wave rectifier bridge.
Rectifier module is due to the general plastic package, in the diode, the pin copper, copper cpu modules plc and connecting wires connected to the surrounding as an insulating filler is filled with thermal conductivity material skeleton - epoxy. However, the thermal conductivity of the epoxy resin is relatively low (typically 0.35 ℃ W / m, up to 2.5 ℃ W / m), and therefore the bridge rectifier junction - is generally greater thermal shell (typically 1.0 to 10 ℃ / W). Under normal circumstances, the relevant parameters  plc input module exterior components, the manufacturer will provide the device junction in the natural cooling conditions - ambient thermal resistance (Rja) and comes as part of a radiator, conducted through the radiator cooling devices junction - case thermal resistance (Rjc).