Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Buck-boost DC converter and its control method

A DC converter and mode control technology, applied in the field of power supply, can solve the problems of high output voltage, changes, and affecting efficiency

Active Publication Date: 2020-03-17
BEIJING XIAOMI PINECONE ELECTRONICS CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems with this solution, first: if the battery is full capacity, its output voltage will be relatively high, then the efficiency of the LDO will be very low, which will shorten the battery life and cause more heat
Second: If the battery capacity is getting lower and lower, its output voltage will also be lower and lower. When the voltage is lower than 3.3V, the LDO will not be able to output 3.3V voltage for system use. In order to ensure the stability and reliability of the system, The solution is generally when the battery voltage drops to about 3.6V, it will alarm for low battery, or even shut down directly
But the problem with this solution is that in the BUCK-BOOST mode, the power switches in the circuit will be turned on or off in pairs at the same time according to a certain timing (such as Image 6 P1 and P3 are turned on or off at the same time, P2 and P4 are turned on or off at the same time), so the dynamic loss is very large, which affects the efficiency
Moreover, due to the influence of factors such as the on-resistance of the switch tube and the parasitic resistance of the wiring, the effective value of the input voltage will change with the change of the load. That is to say, when the load becomes larger, the effective input voltage will decrease. This will cause the converter's operating mode to change depending on the input voltage
If the working mode of the converter is controlled according to the ideal relationship between the input voltage and the output voltage, it is obvious that the buck-boost type DC converter will not be in the best working state

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Buck-boost DC converter and its control method
  • Buck-boost DC converter and its control method
  • Buck-boost DC converter and its control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0094] Specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0095] Such as figure 1 Shown is the functional block diagram of the BUCK-BOOST DC converter provided by the present invention. The BUCK-BOOST DC converter includes: a current detection module 1 , a BUCK-BOOST circuit module 2 , a drive module 3 , an output voltage sampling module 4 and a mode control module 5 . The current detection module 1 is connected to the BUCK-BOOST circuit module 2 for detecting the inductor current in the BUCK-BOOST circuit 1, and sends the current detection signal to the mode control module 5; the output The voltage sampling module 4 is connected to the output terminal of the BUCK-BOOST circuit module 2 for obtaining an output vo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present disclosure relates to a BUCK-BOOST DC converter and a control method thereof. The converter includes a BUCK-BOOST circuit module, a drive module, an output voltage sampling module, a mode control module and a current detection module, and the current detection module is connected to the BUCK-BOOST circuit module for detecting the inductance in the BUCK-BOOST circuit current, and send the current detection signal to the mode control module; the mode control module generates a corresponding PWM mode control signal or PSM mode control signal according to the current detection signal and the output voltage sampling signal, and according to the PWM mode control signal or PSM mode control signal , the driving module drives the BUCK-BOOST circuit to work in the BUCK mode in the PWM mode, the BOOST mode or the BUCK-BOOST mode or the BUCK-BOOST mode in the PSM mode. The disclosure achieves the purpose of outputting a stable voltage in the full load range of the DC converter, and reduces the power consumption of the switching tube and the static loss of the circuit during the mode switching process, thereby improving the conversion efficiency.

Description

technical field [0001] The present disclosure relates to the technical field of power supplies, and in particular, to a BUCK-BOOST DC converter and a control method thereof. Background technique [0002] With the rapid development of electronic technology, all kinds of mobile terminals represented by smart phones and tablet computers have entered thousands of households, and the industry is also making further technological development. It is hoped that through various functions and perfect and reliable Performance brings more convenience to people's life. Among them, standby time and terminal heating are the performances that the industry is trying to improve. At present, the standby time of most terminals is not long enough, and the problem of terminal heating still needs to be further optimized. In order to solve the above two problems, one method is to strive to increase the battery capacity, improve the thermal conductivity of materials, etc.; the other method is to o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02H7/12
CPCH02H7/1213H02M3/1582H02M1/0058Y02B70/10
Inventor 陈进
Owner BEIJING XIAOMI PINECONE ELECTRONICS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products