Flash energy generating circuit for stroboscope with high flash rate frequency range - includes intermediate circuit capacitor connected to AC voltage source across rectifier and flash capacitor connected to flash lamp across charging element

摘要

The flash lamp (BL) is connected parallel to the flash capacitor (CB). The charging circuit for charging the flash capacitor is designed as a series resonant circuit. It consists of the series circuit of a fully controllable semiconductor switch (HS), a charging choke (L) and a blocking diode (D1) formed with the flash capacitor (CB) and pulse width controllable by a control unit (SE). The so constructed series resonant circuit is wired to the free running diode (D2), which related to the polarity of the immediate circuit voltage, is poled in the blocking direction. The blocking diode is a component part of the free running circuit, formed by the flash capacitor, the charge choke and the free running diode. USE/ADVANTAGE - Laryngoscope. Low cost circuit gives exact dosing of individual flash energy, high as possible flash rate frequency and high efficiency. Small intermediate circuit voltage.