Circuit arrangement for controlling a mosfet with a load connected to its source

Claim 1

Circuit arrangement for driving a MOSFET having a load connected between the source terminal and ground, having the features: a) the drain terminal of the MOSFET is connected to an output terminal, b) the output terminal can be connected to one polarity of an operating voltage source, c) there is a switch between the gate terminal of the MOSFET and ground, d) there are two diodes connected in series in the gate line of the MOSFET, e) the series circuit is provided with a central tap which is provided with one terminal of a capacitor, f) the other terminal is connected to a first terminal, to which a clocked d.c. voltage can be applied, characterized by the features: g) the series circuit of the diodes (D 1, D 2) is connected to the aforesaid output terminal (4) via the drain-source path of a second MOSFET (T 2), h) the second MOSFET is of a channel type opposite to that of the first MOSFET (T 1) and its source terminal is connected to the output terminal (4), i) a resistor (R 1) is connected between source terminal and the gate terminal of the second MOSFET, k) the source-drain path of a third MOSFET (T 3) of a channel type corresponding to the first MOSFET is connected between gate terminal of the second MOSFET and ground, I) the gate terminal of the third MOSFET is connected to a second input terminal (2), m) the switch is formed by a fourth MOSFET (T 4) of a channel type corresponding to the first MOSFET, n) the gate terminal of the fourth MOSFET is connected to a third input terminal (3), o) inversely related logical signals can be applied to the second and third input terminal (2, 3).