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Adaptive turnon time control circuit suitable for high-frequency step-down voltage converter

A technology of on-time and control circuits, applied in control/regulation systems, instruments, electrical components, etc., to solve problems such as unstable switching frequency

Inactive Publication Date: 2012-01-25
FUDAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide an adaptive on-time control circuit suitable for high-frequency step-down voltage converters to solve the problem of unfixed switching frequency in traditional control

Method used

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  • Adaptive turnon time control circuit suitable for high-frequency step-down voltage converter
  • Adaptive turnon time control circuit suitable for high-frequency step-down voltage converter
  • Adaptive turnon time control circuit suitable for high-frequency step-down voltage converter

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Embodiment Construction

[0012] The present invention will be described in detail below according to the accompanying drawings and design examples.

[0013] The invention designs an adaptive on-time control circuit applied to a high-frequency step-down DC voltage converter. A typical application structure of this circuit is as figure 1 shown. The high-frequency step-down DC voltage converter is mainly composed of a power stage circuit and a control stage circuit. The power stage is composed of power transistors PMOS, NMOS, and filter inductors and capacitors; the control stage is composed of modules such as comparators, control logic, and self-adaptive on-time controllers. The DUTY signal generated in the control stage circuit generates non-overlapping driving signals through the driving circuit to control the turn-on and turn-off of the power transistors PMOS and NMOS respectively. When the PMOS transistor is turned on and the NMOS transistor is turned off, the left end of the inductor is directly...

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Abstract

The invention belongs to the technical field of integrated circuit design, in particular to an adaptive turnon time control circuit for a high-frequency step-down voltage converter. The step-down voltage converter circuit consists of a power level circuit and a control level circuit, wherein the power level circuit consists of a power tube PMOS (P-channel metal oxide semiconductor), an NMOS (N-channel metal oxide semiconductor), a filtering inductor and a capacitor; and the control level circuit consists of a comparator, a control logic and an adaptive turnon time control circuit module. The adaptive turnon time control circuit consists of a frequency / phase discriminator, a charge pump-based low-pass filter and a voltage control delay unit, and is used for generating the turnon time of each cycle of the converter; and the adaptive turnon time control circuit and the control logic form a negative feedback loop for a DUTY signal so as to lock the switch frequency. In the invention, the turnon time control is superior to the traditional current or voltage mode control; and the adaptive turnon time control circuit is rapid in response and simple in structure, and can be applied to the power management chips of various portable electronic devices.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and specifically relates to an adaptive on-time control circuit for a high-frequency step-down voltage converter, which can be applied to battery-powered devices such as mobile phones, tablet computers, and personal digital assistants. in portable devices. Background technique [0002] In today's consumer electronics market, battery-operated portable devices such as smartphones, tablets, and personal digital assistants are playing an increasingly important role in people's lives. Therefore, a high-efficiency step-down DC voltage converter as a power management unit has become an indispensable module to extend the life of the system. Driven by equipment miniaturization and low cost, switching power converters are gradually stepping into the high-frequency field to reduce the volume of external passive components such as inductors and capacitors. Therefore, the high-frequency st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
Inventor 虞佳乐吕旦竹洪志良
Owner FUDAN UNIV
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