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A power control device and method
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A power control device and power selection technology, which is applied in control/regulation systems, output power conversion devices, electrical components, etc., and can solve problems such as affecting other performance of the terminal and failing to achieve zero power consumption.
Active Publication Date: 2017-11-28
SANECHIPS TECH CO LTD
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Abstract
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Problems solved by technology
In the existing technology, power saving management is carried out by adding various complex control logics. In the application of smart terminals, linear charging is gradually replaced by switch charging. Although the power consumption is reduced to a certain extent, it cannot reach zero power consumption. purpose, and affect other performance of the terminal in the process of reducing power consumption
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Embodiment 1
[0039] An embodiment of the present invention provides a power control device, such as figure 1As shown, the device includes: a first power selection circuit 11, a first LDO12, a second power selection circuit 13, a second LDO14, a reference circuit 15, and a voltage detection circuit 16; wherein,
[0040] The first power selection circuit 11 is configured to select a higher voltage among the USBIN voltage and the ACIN voltage as the first output voltage;
[0041] The first LDO12 is used to step down the first output voltage; specifically, because the input voltage is relatively high, the first output voltage may reach more than 10V, therefore, the first LDO12 lowers the first output voltage to 5V In the following voltage domain; and the first output voltage after the step-down is provided to the second power selection circuit 13 as the second output voltage; and, after receiving the reference voltage, the first LDO12 closes its own startup circuit;
[0042] here, as figure...
Embodiment 2
[0058] Figure 4 Shown is a schematic diagram of a method for power control provided by Embodiment 2 of the present invention, and the method mainly includes the following steps:
[0059] Step 401, the first power supply selection circuit selects a higher voltage among USBIN voltage and ACIN voltage as the first output voltage;
[0060] Step 402, the first LDO starts through the self-starting circuit, and steps down the first output voltage as the second output voltage; and after receiving the reference voltage, closes the self-starting circuit;
[0061] In this step, since the input voltage is relatively high, the first output voltage may reach more than 10V, therefore, the first LDO lowers the first output voltage to a voltage range below 5V; and provides the first output voltage after step-down to the second power selection circuit;
[0062] Here, when the input voltage is just connected, the reference circuit has not yet started, and the first LDO automatically starts ac...
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Abstract
Apparatuses and methods for controlling a power supply are provided. First power supply selecting circuit selects a higher voltage from USBIN and ACIN to be first output voltage; first LDO decreases the first output voltage to second output voltage, and closes self-start circuit after receiving reference voltage; second power supply selecting circuit selects a higher voltage from second output voltage and VBAT to be third output voltage; second LDO supplies the third output voltage as the first input voltage to reference circuit; reference circuit outputs the reference voltage according to first input voltage; second LDO closes self-start circuit after receiving the reference voltage; voltage detecting circuit supplies an enable signal to second LDO when determining that USBIN orACIN reaches a threshold voltage according to the reference voltage; and second LDO provides the first input voltage to reference circuit after receiving the enable signal.
Description
technical field [0001] The invention relates to the field of power managementchip design, in particular to a power control device and method. Background technique [0002] With the rapid development of mobile terminals, current mobile terminal devices such as mobile phones and PDAs have been widely used in many fields such as consumption, communication, video and voice, etc. Therefore, the standby time of mobile terminals has become a decisive indicator to measure the quality of products ; The corresponding charging management chip must also have the function of saving power and low power consumption. While improving the technology of the power managementchip, it is also a development direction for low-power design to optimize and refine the circuit. In the existing technology, power saving management is carried out by adding various complex control logics. In the application of smart terminals, linear charging is gradually replaced by switch charging. Although the power ...
Claims
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Application Information
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