DC ATX power supply supporting a plurality of input voltages

Abstract

The invention provides a DC ATX power supply supporting a plurality of input voltages, comprising an external voltage supply terminal, a control module and a DC-DC conversion module. The control module is used for detecting an external input voltage; comparing the input voltage with preset voltage; when the input voltage is higher than the preset voltage, starting the DC-DC conversion module to control the DC-DC conversion module to decrease the input voltage to the working voltage required by the DC ATX power supply; and when the input voltage is equal to the preset voltage, turning off the DC-DC conversion module in order that the external input voltage is directly output to an ATX interface. Thus, the DC ATX power supply can be compatible with various voltage inputs so as to support voltage input over 12V, solves the problem that the DC ATX power supply causes a computer motherboard to burn out when using power over 16V by mistake, and reduces the requirement for 12V voltage input.

Description

technical field [0001] The invention relates to power supply technology, in particular to a DC ATX power supply supporting multiple input voltages. Background technique [0002] The function of the ATX power supply is to convert the input voltage into the DC 3.3V, 5V, 12V voltage and -12V voltage used inside the computer, and generate a voltage ready signal according to the ATX specification. Compared with the ATX power supply that uses AC 220V input, the DC ATX power supply uses DC as the input, and separates the AC-to-DC (AC-DC) part from the DC-to-DC (DC-DC) part. The advantage is that the DC-DC part can be highly efficient. Realization, the circuit area is small, and has been widely used in computer hosts in the fields of small size, low power consumption and quietness. [0003] Current DC-DC conversion topologies include: 1) Step-down type: the input voltage is higher than the output voltage, and its control chip has many choices, and it is easy to output higher power;...

AI Technical Summary

Problems solved by technology

At this time, the input voltage can be higher than, equal to or lower than the output voltage, but the circuit topology of the DC-DC converter to generate 12V needs to choose a buck-boost structure, and the optional chips are rarely much more expensive than the step-down DC-DC control chips. , such as Linear Technology's LTC3780, the cost is high

[0011] To sum up, the problems of the existing DC ATX power supply include: Type 1: simple to implement, cheap, but high requirements for input power supply, cannot use a power supply greater than 12V as input, otherwise it is easy to burn out the computer motherboard; Type 2: 12V Step-down DC-DC converters have many chips to choose from, and the price is cheap. If the input voltage is 12V, there will be no 12V output, and the computer will not work normally; Type 3: wide voltage input, which can output the voltage required by the computer. but the price is high

Therefore, it is necessary to propose a circuit structure compatible with 12V and above 16V input and realize a DC ATX power supply, increase the support of the above-mentioned 2nd type DC ATX power supply for input 12V, and solve the misuse of 16V or above power supply by the 1st type DC ATX power supply Problems that cause computer motherboards to burn out

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