NBD-0505-PWM discharge circuit

NBD-0505-PWM discharge circuit is designed for simplification of solid-state laser systems development. It is intended for use in high power IPL and long pulse Nd:YAG, KTP, Alexandrite laser systems and utilizes PWM (pulse-width modulation) technology. The module forms rectangular or quasi-rectangular pulses on a flashlamp (using energy stored in an external capacitor bank) and provides simmer current during the interval between pulses.

The NBD-0505-PWM consists of IGBT, its driver, protective circuits, integrated inductance coil (80 uH) and small capacitor bank (~ 1 mF / 800 V) as well as simmer and trigger circuits, discharge resistors and controls. It also contains a fan for active cooling.

The module has two outputs by default, one is for PWM operations, the other is for free-discharge operations (can not be used simultaneously). As an option, it is possible to make one universal output for both free-discharge and PWM operations, realized as operating regimes in this case.

The flashlamp operating frequency and pulse duration is to be varied by +5 V TTL signal from an external control device applied to the respective pin.

By default, NBD-0505-PWM utilizes serial triggering method in both channels (external triggering option is available on request).

The unique feature of NBD-0505-PWM is advanced current control provided by PWM technology, which makes true rectangular pulses possible (see the picture below for a typical waveform).

Let us emphasize, NBD-0505-PWM discharge circuit is not a stand-alone solution. For proper operation it requires capacitor charging power supply and capacitor bank, an external control device, external +24 V DC power supply, as well as other minor parts and controls (see also the picture below).