Patent ID: 7113379
Filing Date: 2006-09-26
Classification: H02H,H02M

Abstract:
1. A DC-DC converter comprising: a plurality of switching power supply circuits that are connected in parallel with each other, a total output thereof being supplied to a load, wherein each of the switching power supply circuits includes an overcurrent detection circuit section for directly or indirectly detecting an overcurrent state of the current that is output to the load, and an overcurrent protection circuit section for performing a hiccup-mode overcurrent protection operation in which the circuit operation is cyclically stopped and restarted upon the detection of an overcurrent state; and a device that is arranged to match hiccup-mode restart timings of the switching power supply circuits when each of the switching power supply circuits performs the hiccup-mode overcurrent protection operation using the corresponding overcurrent protection circuit section; wherein each of the switching power supply circuits includes a switching controller for controlling the stopping and the starting of the circuit operation, and the overcurrent protection circuit section controls the switching controller to perform the hiccup-mode overcurrent protection operation, and wherein each of the switching power supply circuits includes a simultaneous starting connection that is connected to the corresponding switching controller, and the simultaneous starting connections of the switching power supply circuits are interconnected directly or indirectly, so that the switching controllers of the switching power supply circuits are interconnected to match the restart timings of the hiccup mode caused by the overcurrent protection circuit sections.