CN-122001060-A - Power supply circuit, power supply control method and power supply chip

CN122001060ACN 122001060 ACN122001060 ACN 122001060ACN-122001060-A

Abstract

The application provides a power supply circuit, a power supply control method and a power supply chip, and relates to the technical field of charging. The power supply circuit includes a first terminal, a second terminal, and a buck-boost converter connected between the first terminal and the second terminal of the power supply circuit, the buck-boost converter having a switchable buck mode and a boost mode, the boost mode having the first terminal as an output terminal, the second terminal as an input terminal, the buck mode having the first terminal as an input terminal, the second terminal as an output terminal, the buck-boost converter being configured to operate in a first boost mode in response to the second terminal accessing an external powered device to boost a battery input voltage obtained from the first terminal and to output a voltage from the second terminal to power the external powered device, and the buck-boost converter being configured to operate in a second boost mode in the absence of an external device if the battery voltage is less than a first preset threshold to boost the battery input voltage obtained from the first terminal to an output voltage of the second terminal that is greater than a second preset threshold.

Inventors

Weng Qinghuang
XIE YUANPENG

Assignees

联想(北京)有限公司

Dates

Publication Date: 20260508
Application Date: 20260109

Claims (10)

1. A power supply circuit, comprising: A first end; A second end; A buck-boost converter connected between a first end and a second end of the power supply circuit, the buck-boost converter having a switchable buck mode and a boost mode, wherein in the boost mode, the first end is an output end, the second end is an input end, in the buck mode, the first end is an input end, and the second end is an output end; In response to the second terminal accessing an external powered device, the buck-boost converter is configured to operate in a first boost mode to boost a battery input voltage obtained from a first terminal and to output a voltage from the second terminal to power the external powered device; And when the second terminal is not provided with an external device, if the battery voltage is determined to be smaller than a first preset threshold value, the step-up-down converter is configured to work in a second step-up mode so as to step up the battery input voltage obtained from the first terminal into the output voltage of the second terminal which is larger than the second preset threshold value, and output the output voltage for supplying power to a system load.
2. The power supply circuit of claim 1, further comprising: A path management module configured to: forming a first power supply path from the first end to a system power supply node when the buck-boost converter is in the buck mode; Forming a second power supply path from the first end to a system power supply node when the buck-boost converter is in the second boost mode; When the buck-boost converter is in the first boost mode, a third power supply path is formed from the first end to the second end.
3. The power supply circuit according to claim 2, The buck-boost converter comprises a first switch, a second switch and an energy storage inductor; the first switch and the second switch are connected in series between the second terminal and a reference ground; One end of the energy storage inductor is connected to a switch node between the first switch and the second switch, and the other end of the energy storage inductor is connected to the first end, wherein the energy storage inductor is charged and discharged by configuring the periodical on and off of the first switch and/or the second switch, so that the input voltage is subjected to waveform adjustment to realize reversible buck-boost piezoelectric energy conversion between the first end and the second end of the buck-boost converter.
4. The power supply circuit of claim 3, the path management module comprising: The first path switch is connected between the first end and a system power supply node and used for switching on or off the first power supply path; A second path switch connected between the second end and the system power supply node for turning on or off the second power supply path; and the third switch is connected between the second end and the first switch and is used for switching on or off the third power supply path.
5. The power supply circuit according to claim 4, When no external equipment is arranged at the second end, if the voltage of the battery is not less than a first preset threshold value, the buck-boost converter is configured in an idle mode, the first path switch is turned on, and the second path switch and the third switch are turned off so as to supply power for the system load through the battery.
6. The power supply circuit according to claim 5, When no external equipment is arranged at the second end, if the battery voltage is determined to be smaller than a first preset threshold value, the step-up/step-down converter is switched from the idle mode to the second step-up mode; In the second boost mode, the buck-boost converter is configured to have a first operating state and a second operating state in sequence; In the first operating state, the buck-boost converter is configured to output a first voltage that is the same as a current voltage of the first end; In the second working state, the buck-boost converter is configured to boost the target voltage to a second voltage greater than the second preset threshold value and output through the second power supply path to supply power to the system load.
7. The power supply circuit according to claim 4, When the second end accesses to an external power supply, if the power of the external power supply is determined to be larger than a preset power threshold, the buck-boost converter is configured to work in the buck mode, and the external power supply supplies power to the system load; And if the power of the external power supply is not greater than the preset power threshold, the buck-boost converter is configured to work in the second boost mode, and the external power supply and the battery supply power to the system load together.
8. The power supply circuit according to claim 7, When the power of the connected external power supply is larger than a preset power threshold, the power supply circuit is configured to sequentially have the following states; The output voltage of the buck-boost converter is configured to rise from a third voltage to a fourth voltage, and the external power supply is connected to the buck-boost converter, wherein the third voltage is greater than the second preset threshold, and the fourth voltage is greater than the third voltage; A power supply state in which the buck-boost converter is configured to switch to the buck mode and output the fourth voltage to cause the external power source to be used for the system load power supply; A state of charge in which the buck-boost converter is configured to output the third voltage for charging the battery.
9. A power supply control method is applied to a power supply circuit with a step-up and step-down converter, The method comprises the steps of responding to the second end of the power supply circuit to access external power receiving equipment, configuring a buck-boost converter of the power supply circuit to work in a first boost mode so as to boost battery input voltage obtained from a first end and output voltage from a second end to supply power to the external power receiving equipment, wherein the buck-boost converter is connected between the first end and the second end of the power supply circuit and has a switchable buck mode and a boost mode, wherein in the boost mode, the first end is used as an output end, the second end is used as an input end, and in the buck mode, the first end is used as an input end, and the second end is used as an output end; And when the second end has no external equipment, if the battery voltage is determined to be smaller than a first preset threshold value, configuring the step-up/step-down converter to be in a second step-up mode so as to step up the battery input voltage obtained from the first end into the output voltage of the second end which is larger than the second preset threshold value, and outputting the output voltage for supplying power to a system load.
10. A power chip, comprising: a battery interface connected with the battery; A system power supply node connected with a system load; A power supply circuit connected between the battery interface and the system power supply node, wherein the power supply circuit comprises: A first end; A second end; A buck-boost converter connected between a first end and a second end of the power supply circuit, the buck-boost converter having a switchable buck mode and a boost mode, wherein in the boost mode, the first end is an output end, the second end is an input end, in the buck mode, the first end is an input end, and the second end is an output end; In response to the second terminal accessing an external powered device, the buck-boost converter is configured to operate in a first boost mode to boost a battery input voltage obtained from a first terminal and to output a voltage from the second terminal to power the external powered device; And when the second terminal is not provided with an external device, if the battery voltage is determined to be smaller than a first preset threshold value, the step-up-down converter is configured to work in a second step-up mode so as to step up the battery input voltage obtained from the first terminal into the output voltage of the second terminal which is larger than the second preset threshold value, and output the output voltage for supplying power to a system load.

Description

Power supply circuit, power supply control method and power supply chip Technical Field The present application relates to the field of charging technologies, and in particular, to a power supply circuit, a power supply control method, and a power supply chip. Background Silicon negative electrode batteries have been selected for use in many cell phones/tablet devices because of their high energy density and potentially low cost advantages. Since the minimum discharge voltage of the silicon negative electrode is lower than that of the traditional battery, about 2.5V can be achieved, and the minimum power supply voltage of the traditional mobile phone/tablet peripheral device is usually designed according to 2.7V, the introduction of the silicon negative electrode battery can cause great impact on the traditional system power supply design. Disclosure of Invention The embodiment of the application aims to provide a power supply circuit, a power supply control method and a power supply chip, and the technical scheme is as follows: a first aspect of the present application provides a power supply circuit comprising: A first end; A second end; The buck-boost converter is connected between a first end and a second end of the power supply circuit, and is provided with a switchable buck mode and a boost mode, wherein the first end is used as an output end, the second end is used as an input end, and the first end is used as an input end and the second end is used as an output end in the buck mode; in response to the second terminal accessing the external powered device, the buck-boost converter is configured to operate in a first boost mode to boost a battery input voltage obtained from the first terminal and to output a voltage from the second terminal to power the external powered device; When the second terminal has no external device, if the battery voltage is determined to be smaller than a first preset threshold value, the step-up/step-down converter is configured to operate in a second step-up mode to step-up the battery input voltage obtained from the first terminal to an output voltage of the second terminal larger than the second preset threshold value, and output the output voltage for supplying power to a system load. In some embodiments, the power supply circuit further comprises a path management module configured to form a first power supply path from the first end to the system power supply node when the buck-boost converter is in the buck mode, form a second power supply path from the first end to the system power supply node when the buck-boost converter is in the second boost mode, and form a third power supply path from the first end to the second end when the buck-boost converter is in the first boost mode. In some embodiments, the power supply circuit includes a buck-boost converter including a first switch, a second switch, and an energy storage inductor, wherein the first switch and the second switch are connected in series between a second terminal and a reference ground, one end of the energy storage inductor is connected to a switch node between the first switch and the second switch, and the other end of the energy storage inductor is connected to the first terminal, wherein the periodic on and off of the first switch and/or the second switch is configured to charge and discharge the energy storage inductor, so that an input voltage is subjected to waveform adjustment to realize reversible buck-boost energy conversion between the first terminal and the second terminal. In some embodiments, the power supply circuit comprises a first path switch, a second path switch and a third switch, wherein the first path switch is connected between the first end and a system power supply node and used for switching on or off a first power supply path, the second path switch is connected between the second end and the system power supply node and used for switching on or off a second power supply path, the third switch is connected between the second end and the first switch and used for switching on or off a third power supply path. In some embodiments, the foregoing power supply circuit, wherein when the second terminal has no external device, if it is determined that the battery voltage is not less than the first preset threshold, the buck-boost converter is configured in the idle mode, the first path switch is turned on, and the second path switch and the third switch are turned off to supply power to the system load through the battery. In some embodiments, the power supply circuit further includes a step-up/step-down converter configured to switch from the idle mode to a second step-up mode when the battery voltage is determined to be less than the first preset threshold when the external device is not present at the second end, the step-up/step-down converter configured to sequentially have a first operating state and a second operating state, the step-up/step-down converter configured to outpu