Patent ID: 7930579
Filing Date: 2011-04-19
Classification: G01R

Abstract:
1. A voltage test circuit for testing a computer power supply, comprising: a voltage input unit configured for receiving voltages from the computer power supply; a voltage output unit configured for outputting the voltages to a plurality of electrical loads; a test unit connected between the voltage input unit and the voltage output unit for testing output ripple and noise of the voltages; a switch control unit; and a capacitive load module having a plurality of capacitive loads, the switch control unit connected between the voltage input unit and the capacitive load module for selecting a suitable capacitive load according to the computer power supply; wherein the voltage input unit comprises first˜eighth connectors configured for simulating corresponding power interfaces of a motherboard, and an input switch configured for making the computer power supply, supply power to the voltage test circuit, the voltage output unit comprises first˜sixth outputs configured for respectively outputting a first output voltage +5 Vsb, a second output voltage +3.3V, a third output voltage −12V, a fourth output voltage +12V1, a fifth output voltage +5V, and a sixth output voltage +12V2 corresponding to the computer power supply; wherein the switch control unit includes a first switch, a second switch, and a third switch, the first switch includes first˜seventh sub-switches, one terminal of the first sub-switch is connected to the third output via the first connector, one terminal of the second sub-switch is connected to the first output via the first connector, one terminal of the third sub-switch is connected to the fourth output via the third connector, one terminal of the fourth sub-switch is connected to the fifth output via the first connector, one terminal of the fifth sub-switch is connected to the second output via the first connector, one terminal of the sixth sub-switch is connected to the fourth output via the first connector, one terminal of the seventh sub-switch is connected to the sixth output via the second connector, the second switch and third switch are single-pole double-throw (SPDT) switches, a pole of the second switch is connected to the other terminal of the first sub-switch, a pole of the third switch is connected to the other terminal of the fourth sub-switch, throws of the second and third switches are correspondingly connected to the capacitive load module.