Power supply circuit has limiting diode in parallel with transistor switching path with control connection connected to voltage source via limiting diode fixing maximum input voltage

摘要

The circuit has a first working resistance (14) and the switching path of a first transistor (13) connected to the first connection (10) of an input voltage source (11). The transistor's control connection and the working resistance are connected together and via a limiting diode (20) to the second connection (18) of the input voltage source. The limiting diode is connected in parallel with the switching path of a second transistor (23) whose control connection is connected to the first connection of the input voltage source via a second limiting diode (21) determining the maximum input source voltage, above which the first transistor switches.