Rectifier bridge naming rules and bridge stack principle

  Rectifier Bridge Naming Rules

Generally, there are 3 numbers in the name of the rectifier bridge, the first number represents the rated current, A; the last two numbers represent the rated voltage (number*100), V

50A, 1000V (1234567, 005, 01, 02, 04, 06, 08, 10 respectively represent the voltage range of 50V, 100V, 200V, 400V, 600V, 800V, 1000V ).

The principle of bridge stack

As a power component, the bridge stack is very extensive. Applied to a variety of power equipment. Its interior is mainly composed of a bridge circuit composed of four diodes to convert the input AC voltage into the output DC voltage.

In each working cycle of the bridge stack, only two diodes are working at the same time. Through the unidirectional conduction function of the diodes, the alternating current is converted into a unidirectional DC pulsating voltage . Anatomy of the commonly used low-power bridge stack will find that the full-wave bridge stack adopts a plastic package structure (most of the low-power bridge stacks use this package). The four main heat-generating components in the bridge, the diodes, are divided into two groups and placed on the pin copper plate of the DC output.

There are two connecting copper plates between the DC output pin copper plates, and they are respectively connected to the input pins (AC input wires), forming the four external copper plates we see on the outside. A full-wave bridge stack of connection pins. Since the series of bridge stacks are all in plastic packaging structure, the above-mentioned diodes, lead copper plates, connecting copper plates and connecting wires are filled with epoxy resin as an insulating and thermally conductive skeleton filling material. However, the thermal conductivity of epoxy resin is relatively low (usually 0.35°C W/m, up to 2.5°C W/m), so the junction-to-case thermal resistance of the bridge stack is generally relatively large (usually 1.0~10 °C/W).

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