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Switching frequency control device and control method thereof

A technology for controlling equipment and switches, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc.

Active Publication Date: 2021-03-19
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 device and control method thereof
  • Switching frequency control device and control method thereof
  • Switching frequency control device 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 switching frequency control device comprising: a timer coupled between a bias voltage and ground, the timer comprising a first input configured to receive a ramp signal, a second input configured to receive a threshold voltage, and An output configured to be connected to an input of a PWM circuit. an output of the timer for setting a constant on-time or a constant off-time of the power converter; and a threshold voltage generator coupled between a bias voltage and ground, the threshold voltage generator being configured to receive Several control signals of the power converter and generate a threshold voltage based on the 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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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/44H02M1/0025H02M1/08H02M3/156H02M3/157
Inventor 席小玉杨勃娄诺
Owner M3 TECHNOLOGY