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A current-limited startup method and circuit for a boost converter

A boost converter, start-up circuit technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as sonic boom

Inactive Publication Date: 2018-08-07
林其亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The published patent CN103701312A provides a current-limiting circuit and method of a boost converter, which performs current-limiting control on both the switching tube and the freewheeling tube in the boost converter, and realizes current limiting within the full load range. But it will also produce the above-mentioned sonic boom phenomenon when it starts to start

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  • A current-limited startup method and circuit for a boost converter
  • A current-limited startup method and circuit for a boost converter
  • A current-limited startup method and circuit for a boost converter

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0030] As described in the background art, the surge of the traditional fast current limiting circuit is the largest at the beginning of startup, because the output voltage PVDD clamps the input voltage VBAT the most at the beginning, and the current on the inductor is the smallest at the beginning , So the existing traditional practices will appear image 3 The waveform shown. See Figure 4 , The current limiting startup method and circuit of the boost converter provided by the present invention adopts a two-stage current limiting method, and uses a smaller current limit at the beginning to achieve the effect of limiting surges, and after the time t1, Then the current limiting is amplified for the second stage of current limiting, in this way to limit the surge, can achieve the dual purpose of quick start and current limiting.

[0031] The present in...

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Abstract

Disclosed are a current-limiting starting method and circuit for a boost converter. The boost converter comprises a switch tube (Q1), a free-wheeling diode (Q2) and a main control circuit. The current-limiting starting circuit comprises a current detection circuit, a control comparison circuit and a clock circuit. The current detection circuit is used for detecting the current of a drain electrode of the switch tube. The control comparison circuit is respectively connected to a first current source (I1), a second current source (I2) and a third current source (I3), and is used for respectively generating a first current-limiting signal (Ilimit1), a second current-limiting signal (Ilimit2) and a third current-limiting signal (Ilimit3) after the boost converter is started. The main control circuit is suitable for generating a drive signal for the switch tube and the free-wheeling diode according to a clock signal (CLK), the first current-limiting signal, the second current-limiting signal and the third current-limiting signal. The current-limiting starting method and circuit for a boost converter can achieve the dual aims of starting rapidly and limiting a current.

Description

Technical field [0001] The invention relates to the field of boost converter circuits, and in particular to a current limiting starting method and circuit of a boost converter. Background technique [0002] In the application of audio amplifiers, a higher PVDD output voltage can be generated by a boost converter to achieve higher output power. figure 1 It is a schematic diagram of a common circuit structure of a boost converter. Please refer to figure 1 The boost converter includes an input voltage VBAT, an energy storage inductor L, a boost circuit, an output capacitor C and an output voltage PVDD. When the boost converter is used for voltage conversion, the efficiency is poor at low power, because at this time there is an extra set of boost circuit actions, and if the output voltage PVDD is controlled at the input voltage VBAT at low voltage, If the boost circuit is activated only when the power is high, there will be problems with inrush current and popping noise. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M1/32
CPCH02M1/32H02M1/36
Inventor 林其亮江宇晟
Owner 林其亮