Bootstrap voltage refresh control circuit, voltage converting circuit and relevant control method

A voltage conversion circuit and control circuit technology, applied in high-efficiency power electronic conversion, circuits, electronic switches, etc., can solve the problems of unfavorable voltage conversion circuit 50, damage to loads, large fluctuation peaks, etc., and achieve good working stability and power consumption small effect

Active Publication Date: 2012-12-19
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Every time the output voltage Vo recovers from less than 3V to 3.3V, there will be large fluctuation peaks, which i

Method used

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  • Bootstrap voltage refresh control circuit, voltage converting circuit and relevant control method
  • Bootstrap voltage refresh control circuit, voltage converting circuit and relevant control method
  • Bootstrap voltage refresh control circuit, voltage converting circuit and relevant control method

Examples

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Example Embodiment

[0054] Figure 5 Shows an example according to an embodiment of the present invention image 3 The main working waveform diagram of the voltage conversion circuit 200 is shown. Next will be combined image 3 with Figure 5 The voltage conversion circuit 200 will be further explained. in Figure 5 In the exemplary illustration, the control circuit 103 detects the flow through the high-side switch M HS Current I H To obtain the second feedback signal Vcs1 representing the load current Io, and the load signal V representing the load state of the output terminal OUT load Including the difference amplified signal Ve. Because the difference amplified signal Ve limits the flow through the high-side switch M HS Current I H Therefore, the difference amplified signal Ve can be used as the load signal V to characterize the load state of the output terminal. load . Of course, the difference amplified signal Ve is selected as the load signal V load According to only an exemplary embodi...

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PUM

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Abstract

The invention proposes a bootstrap voltage refresh control circuit, a voltage converting circuit and a relevant control method. The bootstrap voltage refresh control circuit detects the bootstrap voltage in the voltage converting circuit, provides the enhanced on-off driving signal for a high side switch of the voltage converting circuit based on the bootstrap voltage, and controls the charging of the bootstrap voltage through controlling the on-off switch of the high side switch and a low side switch of the voltage converting circuit based on bootstrap voltage. The bootstrap voltage refresh control circuit can recover the bootstrap voltage in time through adjusting the on-off switch of the high side switch and the low side switch when the bootstrap voltage is insufficient, without increasing more switch devices. The voltage converting circuit comprising the bootstrap voltage refresh control circuit has excellent work stability, and the circuit can work normally when the input voltage and the output voltage are closer, and the circuit has smaller power consumption.

Description

technical field [0001] Embodiments of the present invention relate to power converters, and more particularly to refreshing of bootstrap voltages in power converters. Background technique [0002] Power converters, such as switch-mode voltage converters, have been widely used in various industrial electronic devices and consumer electronic devices. Taking the step-down DC voltage converter as an example, due to its high conversion efficiency, large bandwidth and easy implementation of stability compensation, it is often used in applications that need to convert a relatively high DC input voltage into a relatively low In case of DC output voltage. figure 1 A simplified schematic diagram of a typical step-down DC voltage conversion circuit 50 is shown. In short, the step-down DC voltage conversion circuit 50 receives the input voltage Vin through the input terminal IN, and controls the high-side switch M through the control circuit 51 HS ( figure 1 Shown in the MOSFET) and...

Claims

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Application Information

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IPC IPC(8): H02M3/10H02M3/07
CPCH03K17/063H03K2217/0063H03K2217/0081H02M3/1588H03K17/133Y02B70/10
Inventor 李伊珂
Owner CHENGDU MONOLITHIC POWER SYST
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