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Pulse-frequency modulation DC/DC booster converter

A technology of pulse frequency modulation and step-up converter, which is applied in the direction of output power conversion device, conversion of DC power input to DC power output, instruments, etc.

Inactive Publication Date: 2009-04-29
天津英诺华微电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, looking at many of the above-mentioned existing technical solutions about PFM and hybrid modulation, they all use a fixed Imin size to adjust the on-time or off-time to overcome the problem of excessive output ripple under PFM heavy load. No matter how the time is adjusted, the I L of each modulation cycle must be reduced to the level of I min, which does not fundamentally solve the problem of excessive output ripple

Method used

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  • Pulse-frequency modulation DC/DC booster converter
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  • Pulse-frequency modulation DC/DC booster converter

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Embodiment Construction

[0055] In the PFM DC / DC converter of the present invention, the control logic generation module is used to generate modulation control signals to control the power switching transistors to be turned on and off, so as to realize DC / DC conversion from input to output. The output voltage generates a feedback voltage signal through the feedback network. When the feedback voltage is lower than the predetermined rated voltage, the difference is amplified by the error amplifier, and converted into a current through a low-pass filter and a voltage-current conversion unit. This current is used as The minimum value of the inductor current Imin makes Imin increase to a level greater than 0 with the increase of the output current, and the NMOS turn-on time from Imin to Ipeak decreases to a minimum. At the same time, the circuit detects the size of Iout and Imin through the current detection module. In order to change the PFM control pulse when Iout drops to Imin, turn off the power switchi...

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Abstract

This invention relates to impulse frequency modulation DC / DC lift converter, which comprises the following parts: logic control module to generate one impulse frequency switch signals for DC / DC conversion; feedback network circuit to generate feedback signals; error amplifier circuit to amplify the feedback voltage and base voltage; low pass voltage current conversion module to filter high frequency part to supply conversion induction current; CS signal generation circuit to test difference between feedback voltage and basic voltage to change logic control module; ICU signal generation circuit.

Description

technical field [0001] The present invention relates to a pulse frequency modulation (PFM) DC / DC converter, in particular to a pulse frequency modulation (PFM) DC / DC converter combined with the characteristics of pulse width modulation (PWM). The control strategy with mixed modulation characteristics can significantly reduce the output current ripple under heavy load conditions. Background technique [0002] Due to its small size, low price, and high energy conversion efficiency, DC / DC converter ICs have always been at the core of the design of high-efficiency and energy-saving switching power supplies, and are widely used in various power management systems. Many international leading microelectronic technology companies, such as Linear Technology, Maxim, Analog Devices, National Semiconductor, etc., have invested a lot of manpower and material resources in the DC / DC field, and have developed many kinds of conversion chips with different functions, especially in portable T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M3/335H02M1/08
Inventor 褚以人
Owner 天津英诺华微电子技术有限公司
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