Patent ID: 7295413
Filing Date: 2007-11-13
Classification: H02J,H02M

Abstract:
1. A control circuit of power supply with selectable current-limiting modes, wherein said power supply comprises a power output circuit that provides multiple sets of power outputs to drive multiple loads, and a current-limiting compare circuit is disposed between said power output circuit and each of said loads to determine whether said power output circuit's outputting power to drive said loads is in a normal or a false state, wherein each of said current-limiting compare circuits is coupled to a select circuit, wherein said select circuit provides said current-limiting compare circuits with the operating mode of one to one, one to multiple, multiple to multiple, or multiple to one to enable said loads to be compared by individual said current-limiting compare circuit or integrated said current-limiting compare circuits, whereby when the power supply shuts down, all current-limiting circuits are not shut off; said current-limiting compare circuit having a compare unit installed between each said power output and corresponding said load, and one input terminal of said compare unit being coupled to a constant current source and a reference resistance to generate a current-limiting reference value, and the other input terminal of said compare unit being coupled to a power input terminal and a level resistance to generate a current-limiting compare value, and via comparing said current-limiting reference value with said current-limiting compare value, whether a normal or a false state signal is to he output by said compare unit is determined and sent to said power output circuit; and in the select circuit, a first switch element is disposed in the output terminal of the compare unit that generates the current-limiting reference value, and a second switch element is disposed in the input terminal of the compare unit that generates the current-limiting compare value, and the line of the compare unit's input terminal that generates the current-limiting compare value is coupled to a third switch element, which is integrated to connect at least a line of the compare unit's input terminal that generates the current-limiting compare value.