Computer power and power state signal generating circuit thereon

Abstract

The invention relates to a computer power comprising a system voltage output end, a backup voltage output end and a power state signal generating circuit. The power state signal generating circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and an electronic switch, wherein one end of the first resistor is connected with the system voltage output end and the other end is grounded through a capacitor; a node between the first resistor and the capacitor is connected with the in-phase input end of the operational amplifier; one end of the second resistor is connected with the backup voltage output end and the other end is grounded through the third resistor; a node between the second resistor and the third resistor is connected with the inverted input end of the operational amplifier; the output end of the operational amplifier outputs a power state signal; one end of the fourth resistor is connected with the system voltage output end and the other end is connected to the output end of the operational amplifier and the first end of the electronic switch; the second end of the electronic switch is grounded; and the third end of the electronic switch receives power-on signals sent by a computer mainboard through the fifth resistor. The power supply can satisfy the requirement of power time sequence of the mainboard.

Description

Technical field [0001] The invention relates to a computer power supply, in particular to a signal generating circuit for generating a power state signal (PWR_GOOD) in the computer power supply. Background technique [0002] The computer power supply not only provides voltage for the computer motherboard, but also has a certain signal connection with the computer motherboard, and the signals have a certain relationship in time sequence, that is, time sequence. Timing is an important condition for the computer power supply and the computer motherboard to work well together, and it is also the most common reason why the computer cannot be turned on normally and the computer power supply is incompatible with the motherboard. Among them, the most important thing in the sequence is the relationship between the output voltage of the system power supply (usually represented by the +5V voltage) and the power state signal PWR_GOOD and the power-on signal PS_ON. [0003] Specifically, when ...

AI Technical Summary

Problems solved by technology

[0004] When users use the main board, they may use various computer power supplies. Due to the different products of various computer power supply manufacturers, it may cause the main board to fail to work normally when it is matched with a certain computer power supply. The board is incompatible with the computer power supply, and one of the main reasons for this incompatibility is that the delay time of the timing sequence is incorrect or the voltage is incorrect, which cannot meet the requirements.

If the quality of the computer power supply is poor, the power status signal PWR_GOOD output by the computer power supply has obvious jitter phenomenon, which seriously affects the timing of the motherboard.

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