Patent ID: 8305118
Filing Date: 2012-11-06
Classification: G06F

Abstract:
1. A power supply system, for discharging a resume and reset (RSMRST) signal during the RSMRST signal pull down, comprising: a voltage regulating circuit configured to receive a first voltage signal and convert the first voltage signal to a second voltage signal; a delay circuit configured to be charged by the second voltage signal and output the second voltage signal once fully charged; a switch circuit configured to receive the second voltage signal and output the RSMRST signal according to the second voltage signal; and a discharge circuit configured to discharge the delay circuit; wherein the delay circuit is charged during a first state and discharged during a second state; in the first state, the delay circuit is charged by the second voltage signal; in the second state, the delay circuit is discharged by the discharge circuit, the first voltage signal is pulled down from a high level voltage to a low level voltage and the RSMRST signal is pulled down to a low level voltage earlier than the first voltage signal; wherein the switch circuit comprises a first switch, a second switch, a third resistor, and a fourth resistor; the first switch comprises a first switch first terminal, a first switch second terminal, and a first switch third terminal; the second switch comprises a second switch first terminal, a second switch second terminal, and a second switch third terminal; the first switch first terminal is configured to receive the second voltage signal; the first switch second terminal is grounded; the first switch third terminal is electrically connected to the second switch first terminal; the first switch third terminal is configured to receive a third voltage signal via the third resistor; the second switch second terminal is grounded; the second switch third terminal is configured to output the RSMRST signal; and the second switch third terminal is configured to receive the first voltage signal via the fourth resistor.