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Switching frequency control apparatus and control method thereof

A technology of control equipment and control method, which is applied in the direction of control/regulation system, output power conversion device, DC power input conversion to DC power output, etc.

Active Publication Date: 2019-11-26
M3 TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, constant on-time control schemes and constant off-time control schemes have undesired application issues

Method used

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  • Switching frequency control apparatus and control method thereof
  • Switching frequency control apparatus and control method thereof
  • Switching frequency control apparatus and control method thereof

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Embodiment Construction

[0032] The making and using of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the disclosure, and do not limit the scope of the disclosure.

[0033] The present disclosure will be described with respect to preferred embodiments in the specific context of a constant off-time / on-time controlled power converter operating at a fixed or nearly constant switching frequency under various operating conditions. However, the present invention is also applicable to various power converters. Hereinafter, various embodiments will be explained in detail with reference to the accompanying drawings.

[0034] figure 1 A block diagram of a control device of a power converter according to various embodiments of the pre...

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Abstract

A switch frequency control apparatus comprises a timer coupled between a bias voltage and ground, wherein the timer comprises a first input configured to receive a ramp, a second input configured to receive a threshold voltage and an output configured to be connected to an input of a PWM circuit, wherein the output of the timer is used for setting either a constant on-time or a constant off-time of a power converter and a threshold generator coupled between the bias voltage and ground, wherein the threshold generator is configured to receive a plurality of control signals of the power converter and generate the threshold voltage based upon a duty cycle of the power converter.

Description

technical field [0001] The present invention relates to control schemes for power converters and, in particular embodiments, to power converters employing a constant on-time control scheme or a constant off-time control scheme to have a constant switching frequency under various operating conditions. Background technique [0002] As technology is further developed, various electronic devices such as mobile phones, tablet PCs, digital cameras, MP3 players, and / or the like have become popular. Every electronic device requires DC power at a substantially constant voltage, the voltage of which can be adjusted within specified tolerances even when the current drawn by the electronic device can vary over a wide range. To maintain the voltage within specified tolerances, a power converter (eg, a dc / dc switching converter) coupled to the electronics provides very fast transient response while maintaining a stable output voltage over various load transients. [0003] A hysteretic po...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/44H02M1/0025H02M1/08H02M3/156H02M3/157
Inventor 席小玉杨勃娄诺
Owner M3 TECHNOLOGY