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Switching controller and method of controlling switching operating frequency of a power converter

A technology of power converters and switch controllers, which is applied in the direction of high-efficiency power electronic conversion, conversion equipment without intermediate conversion to AC, control/regulation systems, etc., and can solve problems such as efficiency reduction

Active Publication Date: 2019-11-15
ASTEC INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

VRMs typically have a significant drop in efficiency when reducing the output voltage for a given load current

Method used

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  • Switching controller and method of controlling switching operating frequency of a power converter
  • Switching controller and method of controlling switching operating frequency of a power converter
  • Switching controller and method of controlling switching operating frequency of a power converter

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Embodiment Construction

[0018] The following description is merely exemplary in nature, and is not intended to limit the invention, application or use.

[0019] Some instrument grade and precision power supplies need to work in a relatively wide output voltage range (for example, 3V-12V). Other power supplies (also called power converters) require a wide output voltage fine-tuning range, for example, 0.8V-5V, and sometimes, when the load impedance is very low (for example, less than 1Ohm), the power converter will need to be close to zero output The voltage is working in continuous mode. The operation of the power converter at the output voltage level lower than the rated output voltage causes control problems. One of the problems with low output voltage control is the ability to maintain continuous mode when the work on time becomes smaller and smaller as the output voltage decreases. Based on multiple factors including the PWM resolution of the power converter, various propagation delays, the rise a...

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PUM

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Abstract

The present invention discloses dynamic operating frequency control of a step-down power converter with variable voltage output. A switch controller for a variable output voltage power converter includes an output of a pulse width modulator (PWM) generating a pulse signal for driving a switch of the power converter. The output terminal of the mode selector is connected to the multiplier. The output of the period selector is connected to the input of the multiplier and PWM. The output of the multiplier is connected to the other input of the PWM. The output terminal of the comparator is connected to the input terminal of the cycle selector. When the working on-time state is greater than the minimum working on-time, the cycle selector outputs a rated cycle time to the PWM. When the operating on-time state is less than the minimum operating on-time, the period selector outputs an updated period time greater than the rated period time, thereby causing the PWM output to have an updated period time and a duty cycle of the immediately preceding pulse signal Pulse signals with equal duty cycle.

Description

Technical field [0001] The invention relates to controlling the switching operating frequency of a step-down power converter with variable voltage output or a modified step-down power converter. More specifically, the present invention relates to reducing the switching operation frequency while maintaining a duty cycle for preventing the continuous mode on-time from falling below the continuous mode minimum on-time. Background technique [0002] The statements in this section only provide background information related to the present invention, and may not constitute prior art. [0003] For step-down converters and any variants, such as forward converters or bridge converters, when in continuous inductor current mode, the duty cycle (D) is defined as: [0004] D=V out ÷V in (1) [0005] Where V out Is the output voltage of the converter, V in Is the input voltage of the converter. [0006] For power converters that need to work within a fine-tuning output voltage range, when the ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M1/15H02M3/156H02M3/33507Y02B70/10H02M1/0032H02M3/04
Inventor 维贾伊·G·帕德克扬西·丰塔尼拉·博卡托
Owner ASTEC INT LTD
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