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Power supply circuit, control method and system

A technology of power supply circuit and control terminal, applied in control/regulation systems, battery circuit devices, circuit devices, etc., can solve the problems of increased power consumption of LDO, large gap, and increased power consumption of PMU, and achieve the effect of reducing power consumption

Pending Publication Date: 2021-12-28
HUAWEI TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in the working process of electronic equipment, the greater the input voltage of the LDO, the greater the voltage difference between the input voltage of the LDO and the output voltage, and the greater the gap between the dropout of the LDO, which increases the power consumption of the LDO. Large, which in turn leads to increased power consumption of the PMU

Method used

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  • Power supply circuit, control method and system
  • Power supply circuit, control method and system
  • Power supply circuit, control method and system

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Embodiment Construction

[0048] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application.

[0049] As mentioned in the background technology, the PMU usually includes a BUCK switching power supply and an LDO. The BUCK switching power supply receives the battery voltage. The BUCK switching power supply is connected to the LDO, and the LDO supplies power to the load, such as figure 1 shown. However, different loads have different operating voltages, and one LDO can only output voltage within the rated output voltage range, so different LDOs need to be used to supply power to different loads.

[0050] Such as figure 2 As shown, BUCK switching power supply 1 is connected to LDO1 and LDO2 respectively, LDO1 is connected to load 1, and LDO2 is connected to load 2. Among them, the i...

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Abstract

The invention discloses a power supply circuit, a control method and a system, which are used for reducing the power consumption of an LDO (Low Dropout Regulator). The power supply circuit comprises a control circuit, a switching power supply and a plurality of LDOs. After the control circuit of the power supply circuit obtains the output voltage of the output end of each LDO, the voltage of the output end of a switching power supply connected with the input end of the LDO in a one-to-one correspondence mode can be adjusted according to the output voltage of each LDO, so that the output voltage of each LDO is rated output voltage. The voltage of the output ends of the switching power supplies connected with the input ends of the LDOs in the one-to-one correspondence mode can be adjusted according to the output voltage of the LDOs, so that the output voltage of the LDOs is the rated output voltage, the voltage difference value of the input ends and the output ends of the LDOs is adjusted to be close to dropout, and the utilization rate of power consumption of the LDOs is increased.

Description

technical field [0001] The present application relates to the technical field of terminals, and in particular to a power supply circuit, a control method and a system. Background technique [0002] With the increasingly fierce competition in the electronic market, the power consumption of electronic equipment has become one of the important indicators to measure the performance of electronic equipment. At present, most electronic devices are equipped with a power management unit (PMU), and the PMU is respectively connected to a battery and a load in the electronic device, and can regulate the output voltage of the battery to supply power to the load. [0003] Specifically, the PMU usually includes a switching power supply and a low dropout regulator (low dropout regulator, LDO). Wherein, the switching power supply is connected with the battery, and can step down the received battery voltage, and provide the reduced battery voltage as an output voltage to the LDO. The input...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M3/158
CPCH02M1/00H02M3/158H02J7/00H02M3/156
Inventor 陈剑华周孟特范茂斌夏晓菲王利强
Owner HUAWEI TECH CO LTD