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Optimized pulse over-cycle modulation switch stabilized voltage power supply controller

A technology of modulating switch and regulated power supply, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of power tube switching frequency easily entering the audio frequency range, output voltage ripple, noise, etc.

Inactive Publication Date: 2006-10-25
COMTECH TECH SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the switching power supply using the ordinary PSM controller will skip more clock cycles when the load is light, the actual switching frequency of the power tube easily enters the audio frequency range and generates noise, and the output voltage ripple is relatively large

Method used

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  • Optimized pulse over-cycle modulation switch stabilized voltage power supply controller
  • Optimized pulse over-cycle modulation switch stabilized voltage power supply controller
  • Optimized pulse over-cycle modulation switch stabilized voltage power supply controller

Examples

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Embodiment Construction

[0042] specific implementation plan

[0043] The counter takes the output of the zero state judger as input, and takes the decoder and the NAND gate G 2 The negative logic input is the output. The counter works when the output of the zero state judger is zero, and resets when the output of the zero state judger is non-zero. The counter counts the number of zero states continuously output by the zero state judger, and when the counter counts N consecutive zeros, it outputs a valid signal to the decoder and the NAND gate G 2 Negative Logic Input. Its output shows whether the system frequency is entering the audio. If the output is valid, it means that the system is in the audio range; otherwise, the system is not in the audio range.

[0044]The decoder takes the counter output signal and the state quantity of the state register as input, and its output bus a / b / c is connected to the resistance network. The output bus a / b / c includes 3 signal lines: a, b, c. If the current ou...

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PUM

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Abstract

This invention relates to an optimized pulse crossover modulation switch regulated supply controller composed of a voltage control loop, a current control loop and a primary control gate, in which, the voltage control loop is composed of a voltage comparator, a voltage primary source, an AND gate, a state register, a zero state judgment device, a counter and a decoder to realize the ordinary PSM modulation, the current control loop is composed of a resistor network, the voltage comparator and the voltage primary source to generate different current limit values by controlling the resistor network based on the voltage comparator signals of the local and the last clock periods to realize the conversion of three kinds of duty ratios, said primary control gate is composed of a vibrator, OR gate, a RS trigger, a NAND gate and an AND gate to generate the control signals for conducting or stopping power switch tubes.

Description

technical field [0001] An optimized pulse-span modulation switch stabilized voltage power supply controller belongs to the electronic technical field and relates to a pulse span modulation (PSM) switch stabilized voltage power supply controller applicable to power integrated circuits. Background technique [0002] In power converters, pulse width modulation mode PWM (Pulse Width Modulation) and pulse frequency modulation mode PFM (Pulse Frequency Modulation) are often used. figure 1 It shows the difference of the control waveforms of several control modes. With the feedback voltage V fb with reference voltage V ref The PWM modulation mode uses changing the fixed frequency pulse width to control the power switch tube, the PFM modulation mode uses changing the fixed width pulse frequency to control the power switch tube, and the pulse skip modulation mode PSM (Pulse Skip Modulation) is a part of the power conversion system. A new type of modulation mode, which adjusts the o...

Claims

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Application Information

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IPC IPC(8): H02M3/156G05F1/46
Inventor 罗萍李肇基张波甄少伟
Owner COMTECH TECH SHENZHEN
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