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Adaptive on-time control circuit for pfm mode step-up dc-dc converter

A technology of DC-DC and conduction time, which is applied in the direction of control/regulation system, output power conversion device, instrument, etc. It can solve the problems of reducing the input voltage range, the circuit is difficult to work normally, and the output ripple attenuation effect is not ideal. , to solve the effect of increasing the input voltage ripple

Active Publication Date: 2019-07-09
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its exponential decay reduces its input voltage range
When the input voltage is small, the theoretical peak current is negative, and the circuit is difficult to work normally; when the input voltage is large, the attenuation effect of the output ripple is not ideal.

Method used

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  • Adaptive on-time control circuit for pfm mode step-up dc-dc converter
  • Adaptive on-time control circuit for pfm mode step-up dc-dc converter
  • Adaptive on-time control circuit for pfm mode step-up dc-dc converter

Examples

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Embodiment 1

[0039] Please refer to figure 1 ,Such as figure 1 as shown, figure 1 An overall block diagram (10) of an adaptive on-time control circuit for a PFM mode step-up DC-DC converter provided for the present invention, the circuit includes an input voltage sampling and bias module (100), a capacitor charging Discharge module (101) and voltage comparison and logic generation module (102); wherein,

[0040] The input voltage sampling and biasing module (100), the capacitor charging and discharging module (101), and the voltage comparison and logic generating module (102) are sequentially connected in series, and the adaptive conduction time control circuit (10) receives the DC-DC converter The phase control signal and output the switch control signal to the first driving module of the DC-DC converter.

[0041] Further, on the basis of the above examples, please refer to figure 1 , the step-up DC-DC converter includes a voltage source (source_V in ), inductance (L), first switch (...

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Abstract

The invention provides an adaptive turn-on-time control circuit (10) for a PFM mode booster DC-DC converter. The adaptive turn-on-time control circuit comprises an input voltage sampling and bias module (100), a capacitor charge and discharge module (101) and a voltage comparison and logic generation module (102). The input voltage sampling and bias module (100), the capacitor charge and discharge module (101) and the voltage comparison and logic generation module (102) are connected in series in sequence; and the adaptive turn-on-time control circuit (10) receives a phase control signal of the DC-DC converter and outputs a switching control signal to a first driver module of the DC-DC converter. The adaptive on-time control circuit does not need an extra inductance current detection circuit and can solve the problem that output voltage ripples of the PFM mode booster DC-DC converter increases with input voltage ripples.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to an adaptive on-time control circuit for a PFM mode step-up DC-DC converter. Background technique [0002] In recent years, smart wearable devices based on WBAN (Wireless Body Area Network) have become a hot research topic. Due to the limitations of size and reliability, traditional lithium battery power supply has become a bottleneck for the user experience of smart wearable devices. Thermoelectric generators, single solar cells and fuel cells have great potential in this regard. However, these energy sources usually only provide a very low voltage and low power. A boost converter can effectively solve this problem. [0003] Generally, the power provided by the energy source used in the wireless sensor is low, which reduces the load power of the converter. How to improve the conversion efficiency of the converter becomes an important issue. Compared with CCM mode, DCM mode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M3/156
CPCH02M1/14H02M3/156
Inventor 刘帘曦廖栩锋黄文斌杨银堂朱樟明
Owner XIDIAN UNIV