Power supply selection circuit with floatable input
A power supply selection and circuit technology, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve problems such as large static power consumption of circuits, and achieve the effect of simple circuit structure
Active Publication Date: 2021-12-28
CHENGDU ANALOG CIRCUIT TECH INC
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Problems solved by technology
[0004]
In the prior art, when the power supply is switched, the system needs to judge and input the switching signal. At the same time, the current power selection circuit consumes a lot of static power
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[0024] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] Such as figure 1 As shown, the embodiment of the present invention provides a power supply selection circuit whose input can be floated, which is connected to the main power supply VDDM and the backup power supply VDDB. The power supply selection circuit includes a power switch subcircuit, a level shift subcircuit, a latch and a main power supply The power supply detection sub-circuit; the main power detection sub-circuit is used to detect whether the main power supply VDDM meets the circuit requirements, and outputs the detection signal IN to the level shift sub-circuit, and the level shift sub-circuit is used to convert the detection signal IN into a high-voltage signal, and Output to the latch, the ...
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The invention discloses a power supply selection circuit with floatable input, and relates to the technical field of power supply management systems in integrated circuits. The power supply selection circuit is connected with a main power supply and a standby power supply, and comprises a power supply switch sub-circuit, a level shift sub-circuit, a latch and a main power supply detection sub-circuit; the main power supply detection sub-circuit is used for detecting whether a main power supply meets circuit requirements or not and outputting a detection signal to the level displacement sub-circuit, the level displacement sub-circuit is used for converting the detection signal into a high-voltage signal and outputting the high-voltage signal to the latch, and the latch outputs the high-voltage signal to the power supply switch sub-circuit; a first phase inverter is also connected between the power switch sub-circuit and the latch, and the first phase inverter sends a reverse signal to the power switch sub-circuit; and the power switch sub-circuit switches on the main power supply or the standby power supply according to the high-voltage signal and the reverse signal, and outputs the high-voltage signal to a subsequent circuit through the power output end. The circuit is simple in structure and does not have any static power consumption except for leakage current.
Description
technical field [0001] The invention relates to the technical field of power management systems in integrated circuits, in particular to a power selection circuit whose input can be floated. Background technique [0002] In order to meet the needs of the market, the current chips not only have high requirements for function, area and speed, but also have higher and higher requirements for low power consumption. There are many design ideas for low power consumption, for example: when the system does not need the CPU to work, the clock of the CPU can be turned off to stop it from working; It can reduce the power consumption of the system to a certain extent. [0003] At present, in the application of low power consumption system, in order to extend the standby time, the power supply mode combining main power supply and backup power supply will be selected; when the system is working in high performance mode, the main power supply is used for power supply; When the power supp...
Claims
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IPC IPC(8): H02J9/06
CPCH02J9/068Y02B70/30Y04S20/20
Inventor 黄存华
Owner CHENGDU ANALOG CIRCUIT TECH INC