NBU-1112 discharge circuit

The NBU-1112 discharge circuit is designed to simplify the development of solid-state laser systems. It replaces the previous model NBU-0808, which is now the particular modification NBU‑1112‑08. The module forms quasi-rectangular pulses on a flashlamp using energy stored in external capacitors bank and provides simmer current during the interval between pulses. By default, NBU-1112 includes capabilities both for series and external triggering.

The flashlamp operating frequency and pulse duration can be varied using a +5 V TTL signal from an external control device sent to the respective pin.

The newer model NBU-1112 discharge circuit is similar to the older NBU-1012 model, but it is slightly different in size, more technologically advanced. It is also more suitable for certification. An important feature of the NBU-1112 is the clear and visible separation between the low-voltage and high-voltage parts. The 24 V power input and all interface circuits (SIM and PWF) are separated from the high-voltage circuits by a 4 mm creepage distance and solid insulation to 2500 VAC test voltage.

The NBU-1112 includes IGBT, its driver, protective circuits, simmer and trigger circuits and controls. It also contains a fan for active cooling. The module doesn’t have any embedded discharge resistors, although it includes all the necessary circuits to control them. Discharge resistor assemblies of different size and resistance can be purchased as accessories from us.

It’s important to emphasize that NBU-1112 is not a stand-alone solution. For proper operation it requires capacitor charging power supply and capacitor bank, an external control device to form the pulses, external +24 V DC power supply, as well as some minor parts (see also the picture below).

Simplified as well as more complicated modifications are available on request.