NBD-0505-PWM discharge circuit is designed for use in high power IPL and long pulse Nd:YAG, KTP, Alexandrite laser systems. Module forms flashlamp pulses of rectangular or quasi-rectangular shape using the energy stored in external capacitors bank. Module includes IGBT, its driver, protective circuits, simmering and triggering circuits, discharge resistors and controls.
The unique feature is advanced current control (PWM), which makes true rectangular pulses possible (see picture below for a typical waveform).
Let us emphase, NBD-0505-PWM is not a stand-alone solution. For proper operations it requires capacitor charging power supply and capacitor bank as well as some minor parts and controls (see also the picture below).

Input:
Capacitor bank connection
Note: module already embeds 2mF/800V capacitor bank
Output #1 (PWM):
Pulse width
1 ms to 100 ms
Embedded inductance coil
80 uH
Output #2 (Free discharge):
Pulse width
50 us to 10 ms (other on request)
Simmer parameters:
Open circuit voltage
about 1500 V
Current
300-800 mA (500 mA by default)
Triggering parameters:
Triggering method
Serial only by default
Parallel or both on request
Voltage
Serial - 10kV/~160mJ negative to L-
Parallel, on request - 350V/~20mJ negative to EXT connector
Restrike rate
a few Hz (automatically adjusted)
Environment:
Operation temperature
0 … +40 °C
Storage temperature
-20 … +60 °C
Humidity
90%, non-condensing
Other:
Size (LxWxH)
275x260x145 mm
On request the next options are available:
- High power / current / voltage IGBT with extended parameters
- Digital RS-232 / RS-485 interface
- Different cables
- Different simmering and/or triggering parameters
Modifications by flashlamp triggering type
NBD-0505-PWM discharge circuit with
two outputs - one for true-rectangular pulses (PWM), the other for quasi-rectangular pulses (Free discharge)
Example
NBU-0505-PWM discharge circuit with
one output, but two regimes of operations, one with true-rectangular pulses (PWM), the other with quasi-rectangular pulses (Free discharge)