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Control method and control device of buck single-inductor dual-output branch switch converter

A single-inductance double-output, branch switch technology, applied in the direction of output power conversion devices, circuit devices, battery circuit devices, etc., can solve the problems of increased design, solar panels exceeding the portable requirements, etc., and achieve reasonable output power distribution Effect

Inactive Publication Date: 2009-10-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is still designed according to the maximum power required by the circuit, the required size of the solar panel may exceed the basic portable requirements; and the change of light intensity will also increase the design uncertainty

Method used

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  • Control method and control device of buck single-inductor dual-output branch switch converter
  • Control method and control device of buck single-inductor dual-output branch switch converter
  • Control method and control device of buck single-inductor dual-output branch switch converter

Examples

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Embodiment Construction

[0036] The single-inductance dual-output switching converter of this embodiment is applied to a power supply circuit in a portable device, and includes a first field effect switch tube 1, an inductor 2 connected to the first field effect switch tube 1, and a second switch tube connected to the output end of the inductor 2. The first output branch composed of the field effect switch tube 3 and the second output branch composed of the third field effect switch tube 4 connected to the output terminal of the inductor, wherein the second output branch is a charging circuit, and the output terminal is connected to the rechargeable battery. A feedback circuit is provided on the first output branch and the second output branch, and the feedback circuit respectively samples the output voltages of the first output branch and the second output branch, and compares the sampled voltage with the reference voltage 8 to generate first Negative feedback signal and second negative feedback signa...

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Abstract

The present invention discloses control method and control device of buck single-inductor dual-output switch converter. The invention provided control method can real-time regulate power ratio of a first output branch and a second output branch effectively to make output power distribution of the dual-output branch more reasonable, by regulating and controlling high level clock cycle number and low level clock cycle number in strobe signal sequence. The invention provided buck single-inductor dual-output branch switch converter implements output power dynamic distribution of the first output branch and the second output branch, and under the premise of priority satisfy load power supply, charging the battery is also assured, and total of two parts of power is controlled is a stable range, comparing with the prior art, even if power rating inputted is small can also ensure normal operation of the first output branch load.

Description

technical field [0001] The invention relates to a control method and a control device of a step-down single-inductance double-output switching converter. Background technique [0002] Single-inductor dual-output switching converters are widely used in portable electronic devices due to the use of fewer power components and smaller circuit board footprints. Portability determines that the device must be equipped with an energy storage device, usually a rechargeable lithium battery; and the application environment determines that the device must also be able to work normally when charging the battery. For example, in a portable player, the switching converter needs to generate a 4.2V DC voltage from the input DC voltage to charge the battery, and at the same time generate a 3.3V DC voltage for the decoder chip and other circuits. [0003] Usually, if the input power is not limited, the component parameters of the circuit, such as inductance, power tube, switching frequency, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/00H02M1/08G05F1/46H02J7/00
Inventor 吴晓波孙越明赵梦恋
Owner ZHEJIANG UNIV
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