Voltage detecting circuit for extending interface sub card

Abstract

The invention discloses a voltage detecting circuit for an expansion interface sub-card, which is suitable to be arranged in a computer system, wherein the computer system is provided with the expansion interface sub-card and provides first voltage and second voltage to the expansion interface sub-card. The voltage detecting circuit comprises a voltage detecting module and an external detecting circuit. The voltage detecting module is coupled to the expansion interface sub-card and is used for detecting whether the first voltage is supplied normally in order to determine whether to output a voltage abnormality alarm signal or not through the output end of the voltage detecting module to inform the computer system that a power supply is abnormal. The external detecting circuit is coupled to the output end for detecting whether the second voltage is supplied normally or not in order to determine whether to output a voltage abnormality alarm signal or not through the output end.

Description

technical field [0001] The present invention relates to a voltage detection circuit, and in particular to a voltage detection circuit of an expansion interface daughter card. Background technique [0002] In the computer system, more expansion interface sub-cards (generally called daughter cards) are often added in response to the needs of users. For example, the common hard disk expansion interface sub-card is one of them. The following uses figure 1 Let's briefly introduce the hard disk expansion interface daughter card in the computer system. [0003] figure 1 It is a schematic diagram showing the coupling of the hard disk expansion interface daughter card and its related devices in the computer system. Please refer to figure 1 The symbol 102 is a computer system, the symbol 104 is a hard disk expansion interface daughter card, and the symbol 106 is a backup battery unit (Backup battery unit), and the symbol 108 is a voltage detection module in the backup battery unit ...

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Problems solved by technology

[0004] However, since the voltage detection module 108 only detects the above-mentioned 12V voltage, if the 12V voltage supply is normal, but the 3.3V or 1.8V voltage is not normally supplied, the voltage detection module 108 will not send the voltage abnormality alarm signal Pfail, resulting in The computer system 102 misjudged that 12V, 3.3V and 1.8V are still in normal supply, making the power ready signal PWRGD signal still valid

But at this time, the hard disk expansion interface daughter card 104 is already running in an abnormal state, and the computer system 102 cannot switch to the 1.8V voltage supplied by the backup battery unit 106 in time according to the power ready signal PWRGD, resulting in no guarantee that the system will stop working and maintain Integrity of Data in Computer System 102

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