PFM control method of switching power converter and realizing device thereof

A technology of switching power supply and control method, which is applied in the direction of output power conversion device, conversion equipment without intermediate conversion to AC, and adjustment of electrical variables, etc., which can solve the problems of switching frequency easily entering the audio range, large output ripple, audio noise, etc. problem, to avoid entering the audio range and reduce the output voltage ripple effect

Inactive Publication Date: 2010-12-22
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional PFM control has two disadvantages in practical applications: one is that the output ripple is larger under light load, and the lighter the load, the larger the output ripple
However, due to the sm...

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  • PFM control method of switching power converter and realizing device thereof
  • PFM control method of switching power converter and realizing device thereof
  • PFM control method of switching power converter and realizing device thereof

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specific Embodiment approach

[0027] A specific implementation of the present invention is: a control method of a switching power converter, the specific method is: the output voltage of the switching power converter is divided by R1 and R2 to obtain V FB , V FB with reference voltage V REF Comparison, the compared signal DG generates a PFM signal synchronously with the system clock CLK through the D flip-flop DFF, and then generates the required gate control signal through the gate control logic circuit, and controls the switch of the power stage through the drive circuit to stabilize the output voltage at the preset on voltage. At the same time, the current detection circuit ICC detects the load current I L The size of , and the preset threshold value δ n For comparison, where n=1, 2...N, the current interval judge ID selects the appropriate power tube size according to the detected current, controls the segment selector SD to select the segmented power drive stage, and then completes the selection of...

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Abstract

The invention belongs to the technical field of switching power supply, and particularly relates to a PFM control method of a switching power converter and a realizing device thereof. The method comprises the following steps: detecting the partial voltage value of the output voltage, comparing the rising edge with VREF in each clock cycle, and if the rising edge is lower than VREF, enabling a power-level switching tube to conduct a signal with fixed duty cycle by using a control logic circuit and a power driving circuit; and if the rising edge is high than VREF, skipping the cycle. Meanwhile, the current detection circuit detects a load current and compares the load current with preset threshold, and a current interval judging device selects the appropriate dimensions of the power tube according to the detection current and controls the segment selector to select the segmented power level, thereby realizing an optimal PFM control. The optimal PFM control can keep high efficiency and reduce the ripples of the output voltage, as well as prevent the switching frequency of the system from entering the audible range.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a PFM control method of a DC-DC switching power supply converter and a realization circuit thereof. Background technique [0002] Today, consumer electronics technology is in a period of rapid development. There is an increasing demand for consumer electronics, especially portable battery-operated consumer electronics. With the rapid progress of semiconductor process technology and the continuous strengthening of consumer demand for product functions, the scale of chips in products is also expanding. This will inevitably lead to an increase in chip power consumption, thereby greatly reducing the battery life of the product. For handheld devices, battery life is one of the most concerned issues for consumers. Since the output voltage of the battery changes with the use time, the power management chip is required to provide a stable power supply volt...

Claims

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Application Information

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IPC IPC(8): H02M3/00H02M3/07H02M1/14
Inventor 冯勇彭振飞杨姗姗洪志良
Owner FUDAN UNIV
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