Fixed frequency DC to DC converter control circuit with improved load transient response

A control circuit and circuit technology, applied in the direction of output power conversion device, control/regulation system, DC power input conversion to DC power output, etc., can solve the difficulty of variable frequency design, increase the cost and size of the power conversion system, etc. question

Active Publication Date: 2014-03-26
TEXAS INSTR INC
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Problems solved by technology

During load transients, the magnitude of the voltage dip can be addressed to some extent by adding output capacitance to obtain the required energy, but the additional capacitance value increases the cost and size of the power conversion system
In order to deal with the problem of load transient response, variable frequency PWM methods can be adopted, including fixed on-time with hysteresis, fixed off-time and other methods. They can work close to the approximate fixed frequency in some cases, but m

Method used

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  • Fixed frequency DC to DC converter control circuit with improved load transient response
  • Fixed frequency DC to DC converter control circuit with improved load transient response
  • Fixed frequency DC to DC converter control circuit with improved load transient response

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Embodiment Construction

[0016] One or more embodiments or implementations are described herein with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout, and wherein various features are not necessarily drawn to scale. The present invention provides an analog DC-to-DC converter control circuit that solves the problem of handling output voltage load transient response while still allowing fixed frequency PWM operation, which is used to selectively introduce detection of unregulated dips in DC output voltage caused by triggered by additional PWM signal pulses. As used herein, fixed frequency PWM operation means providing periodic PWM pulses for use in the PWM signal stream by selectively injecting one or more additional pulses between regularly occurring (periodic) pulses, individually Or additionally generate switching control signals for one or more DC-to-DC converter switching devices. The various concepts of the present invention benefit from any...

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Abstract

Analog pulse width modulation (PWM) control circuits and techniques are presented for improving output voltage load transient response in controlling DC to DC conversion systems in which a transient detector circuit restarts a PWM carrier ramp waveform to initiate asynchronous injection of a pulse between the regular periodic PWM pulses in a fixed frequency pulse stream to mitigate the effect of output inductor energy depletion on output voltage.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to U.S. Provisional Patent Application No. 61 / 700,176, filed September 12, 2012, entitled "Improved Output Voltage Load Transient Response in Fixed Frequency DC-to-DC Converters" circuit", the entire contents of which are incorporated into this application by reference. technical field [0003] The present invention relates to the control of DC to DC converters, and in particular to fixed frequency PWM control circuits for controlling DC to DC conversion systems. Background technique [0004] Power supplies for modern electronic circuits typically need to provide a stable, regulated supply voltage for proper operation of processors, application specific integrated circuits (ASICs), memory and other components. Computers, smartphones, tablets, and other electronic products typically employ DC-to-DC converters to provide a power supply voltage for the operation of internal ci...

Claims

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Application Information

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IPC IPC(8): H02M3/00H02M3/156
CPCH02M3/156G05F1/46H02M2003/1566H02M3/1566
Inventor B·T·林奇N·凯斯克尔
Owner TEXAS INSTR INC
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