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Single-inductor switch direct current voltage converter and 4-mode control method

A technology of DC voltage and mode control, which is applied in the direction of DC power input conversion to DC power output, high-efficiency power electronic conversion, and adjustment of electrical variables. Power conversion efficiency, improvement of power conversion efficiency, low noise effect

Active Publication Date: 2009-09-23
苏州日月成科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, for switching converters with a relatively large load variation range, when the load changes greatly, a single control method cannot satisfy the new load with high power conversion efficiency.

Method used

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  • Single-inductor switch direct current voltage converter and 4-mode control method
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  • Single-inductor switch direct current voltage converter and 4-mode control method

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Embodiment Construction

[0044] The four-mode control method of the present invention includes PWM mode control, PFM mode control, dormancy mode control, and low-dropout linear regulator mode control for the single-inductance switching converter. The input voltage is the supply voltage of each module. The first is the power-on and soft-start process to ensure that each module enters a normal working state. Since the output voltage V out It is a low voltage at the beginning, so the circuit enters the PWM mode state at the beginning, so that V out maintained at a stable voltage, and the output current I out .

[0045] In the PWM working mode, if the load changes, the inductor current may be discontinuous, which reduces the power conversion efficiency of the PWM mode. For example, when the inductor current is discontinuous in this embodiment, the load current I is detected out Less than 80mA, or load current I out changes, down to 80mA. In order to ensure high-efficiency power conversion, the syst...

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Abstract

The invention provides a 4-mode control method of a single-inductor switch direct current voltage converter and the single-inductor switch direct current voltage converter which realizes the 4-mode control. A circuit of a controller of the single-inductor switch direct current voltage converter comprises a PWM / PFM / sleep mode module, an LDO module (namely a low dropout line voltage regulation module), a logic control module, a multi-mode control circuit and a voltage division and feedback circuit. The invention realizes the automatic switch of PWM mode control, PFM mode control, sleep mode control and low dropout line voltage regulation mode control of the single-inductor switch direct current voltage converter; when the load is changed in a large range, the invention can have higher power conversion efficiency.

Description

technical field [0001] The invention relates to a switching DC voltage converter, in particular to a single-inductance switching DC voltage converter. Background technique [0002] DC voltage converters are common power management chips for portable devices. The requirements in the application are that the output voltage needs to be stable under various load current conditions, the ripple voltage is low, the noise is low, and the conversion efficiency between the input power supply and the output power supply is high. [0003] Currently, the DC voltage converters on the market mainly include pulse width modulation (PWM) mode and pulse frequency modulation (PFM). The control methods and specific circuits of PWM and PFM are different, and they can both guarantee high power conversion efficiency within the corresponding load range. However, for switching converters with a relatively large load variation range, when the load changes greatly, a single control method cannot sati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M3/145
CPCY02B70/16Y02B70/10
Inventor 何乐年张鲁邵亚利陆燕锋佀鸿伟董玲玲诸剑慧陈东坡
Owner 苏州日月成科技有限公司
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