Online voltage adjustment circuit for board power supply

Patent metadata

Field	Value
Publication number	US-10642297-B2
Application number	US-201916415527-A
Country	US
Kind code	B2
Filing date	May 17, 2019
Priority date	Nov 17, 2016
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

An online voltage adjustment circuit for a board power supply, where a first voltage division circuit is coupled in parallel to a first bias resistor, a second voltage division circuit is coupled in parallel to a second bias resistor, and a detection chip obtains an initial output voltage of the board power supply. Based on the initial output voltage and a preset voltage, a control chip controls a first switch on the first voltage division circuit to be on or off, and a second switch on the second voltage division circuit to be on or off. As a result, a feedback value of a feedback pin of the board power supply changes, and then an output voltage of the board power supply changes, thereby adjusting the output voltage of the board power supply.

First claim

What is claimed is:

1. An online voltage adjustment circuit for a board power supply, comprising:
a first switch;
a first bias resistor, wherein a first end of the first bias resistor is configured to couple to an output pin of the board power supply;
a first voltage division element comprising a first voltage division resistor and coupled in series to the first switch to form a first voltage division circuit, wherein the first voltage division circuit is coupled in parallel to the first bias resistor;
a second switch;
a second bias resistor, wherein a first end of the second bias resistor is configured to couple to a ground pin of the board power supply, wherein the first bias resistor is further configured to couple in series to the second bias resistor;
a second voltage division element comprising a second voltage division resistor and coupled in series to the second switch to form a second voltage division circuit, wherein the second voltage division circuit is coupled in parallel to the second bias resistor, wherein the first voltage division circuit is further configured to couple in series to the second voltage division circuit; wherein a first coupling point couples the first voltage division circuit to the second voltage division circuit, wherein a second coupling point couples the first bias resistor;
a control chip coupled to the first switch and the second switch; and
a detection chip, wherein a first end of the detection chip is coupled to the output pin, wherein a second end of the detection chip is coupled to the control chip, and wherein the detection chip is configured to obtain an initial output voltage of the output pin, and
wherein the control chip is configured to:
control, based on the initial output voltage and a preset voltage, the first switch and the second switch;
control the first switch to be off and the second switch to be off;
set the initial output voltage as a target voltage; and
adjust the initial output voltage to the target voltage.

2. The online voltage adjustment circuit of claim 1 , wherein the control chip is further configured to obtain the preset voltage.

3. The online voltage adjustment circuit of claim 1 , wherein the first switch is a metal-oxide semiconductor field-effect transistor (MOSFET), and wherein the second switch is a switching transistor.

4. The online voltage adjustment circuit of claim 1 , wherein the first switch is a switching transistor, and wherein the second switch is a metal-oxide semiconductor field-effect transistor (MOSFET).

5. The online voltage adjustment circuit of claim 1 , wherein the first switch is a first metal-oxide semiconductor field-effect transistor (MOSFET), and wherein the second switch is a second MOSFET.

6. The online voltage adjustment circuit of claim 1 , wherein the control chip is an advanced reduced instruction set computing (RISC) machines (ARM), a micro control unit (MCU), or a complex programmable logical device (CPLD).

7. The online voltage adjustment circuit of claim 1 , wherein the detection chip is coupled to the control chip by an inter-integrated circuit (I2C) or a low pin count (LPC) interface.

8. The online voltage adjustment circuit of claim 1 , wherein a fixed bias ratio is determined based on resistance values of the first voltage division circuit and the second voltage division circuit.

9. An online voltage adjustment circuit for a board power supply, comprising:
a first switch;
a first bias resistor, wherein a first end of the first bias resistor is configured to couple to an output pin of the board power supply;
a first voltage division element comprising a first voltage division resistor and coupled in series to the first switch to form a first voltage division circuit, wherein the first voltage division circuit is coupled in parallel to the first bias resistor;
a second switch;
a second bias resistor, wherein a first end of the second bias resistor is configured to couple to a ground pin of the board power supply, wherein the first bias resistor is further configured to couple in series to the second bias resistor;
a second voltage division element comprising a second voltage division resistor and coupled in series to the second switch to form a second voltage division circuit, wherein the second voltage division circuit is coupled in parallel to the second bias resistor, wherein the first voltage division circuit is further configured to couple in series to the second voltage division circuit, wherein a first coupling point couples the first voltage division circuit to the second voltage division circuit, wherein a second coupling point couples the first bias resistor to the second bias resistor, and wherein the second coupling point is configured to couple the first coupling point to a feedback pin of the board power supply;
a control chip coupled to the first switch and the second switch; and
a detection chip, wherein a first end of the detection chip is coupled to the output pin, wherein a second end of the detection chip is coupled to the control chip, and wherein the detection chip is configured to obtain an initial output voltage of the output pin, and
wherein the control chip is configured to:
control, based on the initial output voltage and a preset voltage, the first switch and the second switch;
control the first switch to be on and the second switch to be off;
increase the initial output voltage to a first voltage; and
set the first voltage as a target voltage.

10. An online voltage adjustment circuit for a board power supply, comprising:
a first switch;
a first bias resistor, wherein a first end of the first bias resistor is configured to couple to an output pin of the board power supply;
a first voltage division element comprising a first voltage division resistor coupled in series to the first switch to form a first voltage division circuit, wherein the first voltage division circuit is coupled in parallel to the first bias resistor;
a second switch;
a second bias resistor, wherein a first end of the second bias resistor is configured to couple to a ground pin of the board power supply;
a second voltage division element comprising a second voltage division resistor coupled in series to the second switch to form a second voltage division circuit, wherein the second voltage division circuit is coupled in parallel to the second bias resistor,
wherein the first bias resistor is further configured to couple in series to the second bias resistor,
wherein the first voltage division circuit is further configured to couple in series to the second voltage division circuit,
wherein a first coupling point couples the first voltage division circuit and the second voltage division circuit, wherein a second coupling point couples the first bias resistor and the second bias resistor, and wherein the second coupling point is configured to couple the first coupling point to a feedback pin of the board power supply;
a control chip coupled to the first switch and the second switch; and
a detection chip, wherein a first end of the detection chip is coupled to the output pin, wherein a second end of the detection chip is coupled to the control chip, and wherein the detection chip is configured to obtain an initial output voltage of the output pin, and
wherein the control chip is configured to:
control, based on the initial output voltage and a preset voltage, the first switch and the second switch;
control the first switch to be off and the second switch to be on;
reduce the initial output voltage to a second voltage; and
set the second voltage as a target voltage.

11. An online voltage adjustment circuit for a board power supply, comprising:

Assignees

• Huawei Tech Co Ltd

Inventors

• Peng Yunwu
• Peng Qi
• Zhang Xuejing

Classifications

• G05F1/575 Primary

  characterised by the feedback circuit · CPC title

• G05F1/56

  using semiconductor devices in series with the load as final control devices (G05F1/461 takes precedence) · CPC title

• G05F1/561 Primary

  Voltage to current converters (amplifiers H03F) · CPC title