Capacitive voltage converter protective circuit - has PTC resistor and switch which remains closed until resistor reaches specified value

摘要

The circuit has a capacitive voltage divider, an inductor an intermediate transformer and a damping load pref. divided into several sections. At least one section of the damping load switched by a switch (9) consists of at least one temperature sensitive resistor (11) with a series impedance (10). Four-terminal networks (14, 15) may be provided, which hold the damping load (10, 11...) connected until at least the temperature sensitive resistor (11) has reached a specified resistance owing to its heating by the power dissipated in it.