Method for enhancing non-uniform variation grid width of light load efficiency of integrated switch DC-DC converter

A DC-DC, non-uniform change technology, applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc., can solve the problem that the gate width of the switch MOS tube cannot be continuously changed.

Active Publication Date: 2010-12-29
陕西北斗恒星科技发展有限公司
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Problems solved by technology

[0012] Since the gate width of the switching MOS transistor cannot be changed continuously, only a fixed gate width corresponding to a certain load current range can be used.

Method used

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  • Method for enhancing non-uniform variation grid width of light load efficiency of integrated switch DC-DC converter
  • Method for enhancing non-uniform variation grid width of light load efficiency of integrated switch DC-DC converter
  • Method for enhancing non-uniform variation grid width of light load efficiency of integrated switch DC-DC converter

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Embodiment Construction

[0062] The present invention is described in further detail below in conjunction with accompanying drawing:

[0063] The overall circuit structure of the non-uniform gate width adjustment Buck-Boost switch DC-DC converter realized by the present invention is as follows: figure 2 As shown, it includes the power stage main circuit and its drive module, PWM control module, mode selection module, on-chip current detection module, delay line ADC module, switch tube gate width control module and dead time control module. figure 2 The inductor L and capacitor C are external discrete devices, and R L for the load; figure 2 Each block diagram in the figure is a module that realizes a specific function, and all modules are IC internal circuits.

[0064] Such as figure 2 As shown, the main circuit of the power stage and its driving module realize the power transmission function of different voltage conversion types of Buck, Boost and Buck-Boost. The power stage main circuit and i...

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Abstract

The invention discloses a method for enhancing the non-uniform variation grid width of the light load efficiency of an integrated switch DC-DC converter, a Buck-Boost converter in the invention adopts the design of a CSMC 0.5mu m CMOS process library, whole-circuit integration is realized except for a passive filter, the external filter inductance is 2.2mu H, and the filter capacitance is 1mu F. According to the requirements of input voltage and output voltage, the converter can work in three modes: Buck (voltage reducing), Buck-Boost (voltage reducing and boosting) and Boost (voltage boosting), the range of the input voltage is 2.5V-4.2V, the range of the output voltage is 1.5V-5V, and the working frequency is 5MHz. A non-uniform grid width modulation method is adopted in the whole load current range of 10mA-650mA. When the converter works at high frequency of 5MHz, the efficiencies of medium load and heavy load keep above 90 percent all the time, and the efficiency of light load (10mA) can reach above 80 percent. As the grid width of a switching tube is only changed and a control link of the working efficiency of an extra switching tube is not adopted, negative effects caused by frequency conversion control are eliminated fundamentally.

Description

Technical field: [0001] The invention belongs to the field of DC-DC converters, and relates to a method for improving the light-load efficiency of integrated switch DC-DC converters by non-uniformly varying grid width Background technique: [0002] With the continuous advancement of portable electronic products, the power management chip market is developing rapidly. Due to the continuous miniaturization of portable equipment, the trend of integration of switching power supply products is becoming more and more obvious. Increasing the switching frequency can effectively reduce the size of inductors and capacitors, but high frequency limits the conversion efficiency of switching power supplies, especially the efficiency at light loads. General portable devices work in the "standby" state most of the time, and the improvement of the light-load efficiency of the converter is very important to prolong the standby time. [0003] The theoretical efficiency of the switching DC-DC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
Inventor 高源耿莉王轲范世全王胜磊李世杰
Owner 陕西北斗恒星科技发展有限公司
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