A power supply device for electronic equipment and electronic equipment

Abstract

The disclosure provides a power supply device for electronic equipment and electronic equipment, which include a power supply, a capacitor step-down circuit and a linear step-down circuit; the output end of the power supply is connected to the input end of the capacitor step-down circuit, and the first power supply voltage is transmitted To the capacitor step-down circuit; the output end of the capacitor step-down circuit is connected to the input end of the linear step-down circuit, and the second power supply voltage obtained after stepping down the first power supply voltage is transmitted to the linear step-down circuit; the linear step-down circuit The output terminal of the circuit is connected with the component to be powered, and the third supply voltage obtained after stepping down the second supply voltage is transmitted to the component to be powered. The present disclosure converts the first power supply voltage into the second power supply voltage through the capacitive step-down circuit under the condition of lower loss, and then converts the second power supply voltage into the third power supply voltage through the linear step-down circuit, which not only improves the The conversion efficiency from the first supply voltage to the third supply voltage also reduces the added cost.

Description

A power supply device for electronic equipment and electronic equipment technical field The present disclosure relates to the technical field of power supply for electronic equipment, and in particular, to a power supply device for electronic equipment and an electronic device. ready. Background technique [0002] Usually, a power adapter with a single power output is used in electronic equipment, such as the power adapter of a notebook computer. The input range is between 12‑20V. After this single power supply is input to the PC system, it needs to perform DC to DC step-down processing. And power supply for each device, such as CPU, memory, chipset, audio, SSD and so on. However, the power supply of these devices Different platforms (intel & AMD) require different power-on sequences for the power supply voltage of each device. Therefore, it is necessary to convert multiple sets of +5V and +3.3V power supplies respectively to meet the needs of different time periods...

AI Technical Summary

Problems solved by technology

[0003] There are two kinds of power supply devices in the prior art to realize the output of the power supply voltage, the first one is as figure 1 As shown, when the computer system is in the off state, once the power adapter is plugged in, it will immediately convert 3.3V through the linear step-down circuit. The current of this group of power supply is very small, only 20mA. When the computer system switches to the standby state signal, immediately start the switch step-down circuit to convert +3.3V, when +3.3V reaches the set voltage, turn on the switch again, and let the linear step-down circuit convert the 3.3V power supply It is also switched directly through the switch, but the conversion efficiency of this kind of power supply device is very low; the second such as figure 2 As shown, when the computer system is in the off state, once the power adapter is plugged in, it will immediately convert 3.3V through the switch step-down circuit, and then switch out +3.3V through the switch to supply power to the computer system in standby state, although compared with The conversion efficiency of the first type has been improved, but it is still low, and the requirements for the MOSFET in the linear step-down circuit (high current resistance and low internal resistance) are increased, resulting in an increase in cost

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