Patent ID: 6671193
Filing Date: 2003-12-30
Classification: H02M,Y02B

Abstract:
A power source with an arrangement for restricting a short-circuit current, said power source comprising:a primary-side switch block, a transformer unit having a transformer primary side and a transformer secondary side, said primary-side switch block connected to said transformer primary side, and a rectifier connected to said transformer secondary side for generating an output signal of the power source and having at least one switching transistor, a rectifier switching circuit for controlling said at least one switching transistor, wherein said rectifier switching circuit is arranged to be cut off in an overload situation, and at least one switch element connected in parallel with said at least one switching transistor, whereby rectification at the secondary side is realized in an overload situation by said at least one switch element, wherein said primary-side switch block includes a pulse-forming part for controlling the primary-side switch block and for generating a control signal proportional to the output signal of the power source and an arrangement for feeding the control signal from said pulse forming part to said rectifier switching circuit, said rectifier switching circuit controlling said at least one switching transistor in response to the control signal generated by said pulse-forming part.