CD420890B

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A SCR, or Silicon Controlled Rectifier, is a semiconductor device which is widely used as a switching element in electric circuits. The CD420890B is a diode module which consists of four Silicon Controlled Rectifier (SCR) cells. It is primarily used to switch electrical current in industrial, automotive and telecom systems.

The CD420890B has two main application fields, one of which is the control of medium-power alternating and direct current. Its primary advantage over other devices is its immunity to electromagnetic interference. Its diode module configuration helps to reduce power loss and interference between SCRs, ultimately decreasing the risk of overvoltage or thermal runaway. Furthermore, its narrow voltage-controlled and low-temperature operation make it suitable for a range of industrial environments including motor drives and electric welding.

The other field of application is solar photovoltaic or wind power system inverters due to its high switching speed and low on-state voltage drop. The reverse blocking voltage of the device is an important specification and is usually between 4.5 and 6V for 50W SCRs. This voltage can vary depending on the model and power handling capability.

The working principle of the CD420890B is based on a solid-state process of current flow. When current is applied to the SCR, it allows a high voltage across the device, stabilizing a positive voltage across the anode and cathode. This is also referred to as a "forward blocking" state. A reverse voltage applied to the anode will cause current to flow in the reverse direction which is referred to as a "reverse blocking" state. Current is then cut off, resulting in a low voltage across the device.

The CD420890B is a diode module that includes four Silicon Controlled Rectifiers. It is ideal for medium-power alternating and direct current applications, as well as solar PV and wind power system inverters due to its high switching speed and low on-state voltage drop. Its working principle relies on controlling current flow through a process of forward and reverse blocking.

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