Power supply capable of omitting power supply informing pin and operation method thereof

Abstract

The invention relates to a power supply capable of omitting a power supply informing pin and an operation method thereof, in particular to a power supply capable of omitting a power supply informing pin and an operation method thereof. The power supply comprises an input detection circuit, a conversion circuit, a detection circuit and a controller. The conversion circuit converts an input voltage into an output voltage, and the detection circuit detects the output voltage according to an input good signal so as to correspondingly provide an output feedback signal of a first feedback value. The controller stabilizes the voltage level of the output voltage according to the first feedback value. The detection circuit adjusts a self feedback condition according to the input bad signal so as to correspondingly adjust the output feedback signal as a second feedback value according to the feedback condition; and the controller reduces the voltage level of the output voltage according to the second feedback value. According to the invention, the input detection circuit is coupled with the detection circuit, and the current operation condition of the power supply of the circuit at the next stage and the advance notice that the power is about to be cut off are informed through the change of the output voltage.

Description

technical field [0001] The present invention relates to a power supply and its operation method, especially to a power supply which can save the power supply notification pin and its operation method. Background technique [0002] Due to the current popularity of system electronic products, in order to provide stable power supply to system electronic products, most of them will use or built-in power supply unit (Power Supply Unit; PSU, or power supply unit) to supply system electronic products. The product is powered. The power supply usually converts the AC input voltage into a DC voltage (such as but not limited to, 12V), and then converts the DC voltage into a specific voltage (such as but not limited to, 5V, 3.3V) for the back-end converter or processor, etc. , 1.8V, etc.) to operate. Among them, electronic products of the system category usually refer to electronic products using boards (such as but not limited to electronic devices such as computers, servers, and com...

AI Technical Summary

Problems solved by technology

Therefore, this situation will cause each circuit coupled at the rear end of the power supply to have to pull a circuit board trace to connect

In the case of high-density routing on the circuit board, adding a few additional routings will inevitably cause routing difficulties, which will lead to the problem that the product volume cannot be reduced and the power density cannot be increased.

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