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A buck-boost control system and control method for a power supply

A technology of power supply voltage and control system, applied in electrical components, output power conversion devices, conversion equipment without intermediate conversion to AC, etc., and can solve problems such as application limitations and electromagnetic interference.

Active Publication Date: 2020-10-16
江苏长晶科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of application has serious electromagnetic interference EMI and radiation problems due to the periodic charging and discharging process of inductance. For noise-sensitive occasions such as radio frequency, this application will be severely limited.

Method used

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  • A buck-boost control system and control method for a power supply
  • A buck-boost control system and control method for a power supply
  • A buck-boost control system and control method for a power supply

Examples

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Embodiment Construction

[0027] see figure 2 The buck-boost control system of the present invention includes a power supply voltage output circuit including a linear voltage regulator LDO, an undervoltage protection circuit UVLO, a charge pump CP, a single-pole double-throw switch SPDT, and a reference source that provides a reference voltage VREF and a reference current IBIAS for the entire system . The output terminal LDOout of the linear regulator LDO is the output terminal of the power supply to output the supply voltage, and the LDOout （NOM） It is the rated output power supply voltage of the power supply. The input voltage terminal LDOin of the linear regulator LDO is connected to the output terminal SO of the single-pole double-throw switch SPDT. The output terminal SO is controlled by the control terminal SC of the single-pole double-throw switch SPDT, and the single-pole double-throw switch One input terminal S1 of the switch SPDT is connected to VDD and the input signal terminal CPin of the...

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Abstract

A buck-boost control system for a power supply, including a linear voltage regulator LDO, an undervoltage protection circuit UVLO, a charge pump CP, and a single-pole double-throw switch SPDT. The undervoltage protection circuit UVLO detects VDD, and when VDD>The linear voltage regulator LDO Output rated LDOout （NOM） When VDD <ldoout(NOM), the output of the undervoltage protection circuit UVLO controls the charge pump CP to turn on, automatically enters the boost mode, and connects the input LDOin of the linear regulator LDO through its output signal CPout to keep the output power supply voltage LDOout stable; when VDD< / ldoout

Description

technical field [0001] The invention relates to a power management technology of a power supply, in particular to a step-down control system and a control method for a power supply, belonging to the technical field of integrated circuits. Background technique [0002] As portable electronic products are widely used in all aspects of work and life, higher requirements are placed on the performance of the power supply of portable electronic products, especially for battery-powered systems. As the battery is used, the battery voltage will be lower than the rated voltage. The power supply voltage, although the battery still has energy at this time, the power supply system cannot provide the rated power supply voltage. Therefore, buck-boost circuits are used in this battery-powered system. When the battery voltage is higher than the rated power supply voltage, a step-down circuit is used to reduce the output voltage of the power supply system; when the battery voltage is close t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07H02M1/44H02M1/14
CPCH02M1/14H02M1/44H02M3/07
Inventor 杨国江王海波
Owner 江苏长晶科技股份有限公司