An Adaptive Segment Drive dc-dc Converter

A DC-DC, segmented drive technology, applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., can solve the problems of power tube switching frequency changes and limit applications, and achieve the effect of improving efficiency

CN103401423BInactive Publication Date: 2015-07-29UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-07-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an integrated circuit technology, in particular to a load self-adaptive sectional driving circuit with a mode switching function. A self-adaptive sectional driving DC-DC (Direct Current to Direct Current) converter which is disclosed by the invention comprises a conversion unit, a driving unit and a feedback control unit and is characterized in that the conversion unit comprises a switching circuit and a filtering circuit; the switching circuit comprises a plurality of PMOS (P-channel Metal Oxide Semiconductor) power tubes which are connected in parallel and a plurality of NMOS (N-channel metal oxide semiconductor) power tubes which are connected in parallel; the PMOS power tubes are divided into PM groups; the NMOS power tubes are divided into NM groups; and the driving unit can be used for respectively controlling on-off of each group of PMOS tubes and NMOS tubes. The self-adaptive sectional driving DC-DC converter has the beneficial effects that a driving mode of the power tubes is changed; the effect of working in a PSM (Pulse Skipping Modulation) control mode under a light load is improved; the number of the started power tubes is changed by detecting variation of a load current so as to minimize the sum of conduction loss and driving loss of the power tubes, thereby improving efficiency of the DC-DC converter and particularly efficiency under the light load. The self-adaptive sectional driving DC-DC converter is particularly suitable for the DC-DC converter.
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Description

technical field

[0001] The invention relates to integrated circuit technology, in particular to a load self-adaptive section drive circuit with mode switching. Background technique

[0002] A DC-DC converter is a voltage converter that converts a non-fixed DC voltage into a fixed output DC voltage. DC-DC converters are divided into three categories: step-up DC-DC converters, step-down DC-DC converters, and step-up and step-down DC-DC converters. According to its different control modes, it is divided into: PWM (Pulse Width Modulation) control mode, PFM (Pulse Frequency Modulation) control mode, PSM (Pulse Interval Modulation Mode) control mode, and hybrid control mode (two or more of the above control modes) combination of modes), the PWM control type has high efficiency at medium to high loads and has good output voltage ripple and noise. PFM and PSM modes are usually used in the case of light load (lower load current) to improve the conversion efficiency of the converter...

Examples

Embodiment

[0032] This example is in figure 1 36 PMOS power tubes and 36 NMOS power tubes are used, and the 36 power tubes are divided into 6 sections of PMOS power tubes and 6 sections of NMOS power tubes, and 1 section of PMOS power tubes is composed of 6 PMOS power tubes. Tubes are connected in parallel. Similarly, 1 segment of NMOS power tubes is composed of 6 NMOS tubes in parallel. The significance is to split the switching circuit composed of 36 PMOS power tubes and 36 NMOS power tubes into 6 sub-unit segments that are independently controlled. , in order to achieve the purpose of flexible control, the specific circuit structure is as figure 2 As shown, wherein the feedback control unit also includes a PWM control circuit, a PSM control circuit, a digital control circuit, a PWM / PSM mode determination circuit and a duty cycle detection circuit, and the drive unit includes a segmented control logic module and a drive module, so The input terminals of the PWM control circuit and th...