Electric circuit arrangement for the input protection circuit of a switching power supply and a switching power supply

An electric circuit arrangement (30) for the input protection circuit of a switching power supply, having a surge protection circuit (12), which is contacted with a supply voltage on an input side and to which a current-compensated choke is connected as a suppression component (14), said current-compensated choke being connected to a rectifier circuit (16) comprising an energy storage means (18) on an output side,

• characterized in that
• the surge protection circuit (12) is formed by a first and a second varistor (RV100, RV101), said first varistor (RV100) being arranged upstream of the current-compensated choke (LD100) and said second varistor (RV101) being arranged downstream of the current-compensated choke (LD100),
• in that the current-compensated choke (LD100) is dimensioned such that it has a smallest possible ohmic resistance and a largest possible inductivity,
• in that the rectifier circuit (16) comprises silicon diodes (D100 to D104) having an average forward current of at least 5 Amperes, in that the energy storage means (18) is realized as a ceramic capacitor (CK100, CK102), and
• in that conducting path fuses covered by a casting compound are integrated in a conductor plate as surge protection devices.