Boost type direct current converter starting control method and device and switching power supply

A starting control device and DC converter technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, control/regulation system, etc., can solve the problem of affecting circuit reliability and safety, exceeding the current safety range , inductor current overshoot and other issues, to avoid the continuous increase of inductor current, improve circuit safety and reliability, and solve the effect of current overshoot

Active Publication Date: 2022-05-13
南京融芯微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If in order to give the bootstrap capacitor C Boost Charging, the lower power tube is turned on for a long time, it is easy to cause the inductor current to overshoot, even exceed the current safety range, and affect the reliability and safety of the circuit

Method used

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  • Boost type direct current converter starting control method and device and switching power supply
  • Boost type direct current converter starting control method and device and switching power supply
  • Boost type direct current converter starting control method and device and switching power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 of the present invention provides a start-up control method for a step-up DC converter. This embodiment is applicable to an application scenario where step-wise control is performed at the initial stage of start-up of a step-up DC converter. The method can be controlled by start-up The starting control device can be implemented in the form of hardware and / or software, and the starting control device can be configured in the control module of the switching power supply.

[0029] combined reference figure 1 As shown, the boost DC converter has a bootstrap capacitor C Boost , the upper power tube HS, the lower power tube LS and the inductor L, when the lower power tube LS is turned on, the charging circuit of the bootstrap capacitor is turned on.

[0030] In this embodiment, the start-up control method of the step-up DC converter includes: the bootstrap capacitor pre-charging stage, the output voltage compensation stage and the output voltage boosting stage a...

Embodiment 2

[0080] Based on the above-mentioned embodiments, Embodiment 2 of the present invention provides a step-up DC converter start-up control device. The start-up control device provided by the embodiment of the present invention can execute the start-up control method provided by any embodiment of the present invention. The corresponding functional modules and beneficial effects of the method. The method includes: a bootstrap capacitor precharging stage, an output voltage compensating stage and an output voltage boosting stage executed in sequence.

[0081] combined reference figure 1 As shown, the boost DC converter has a bootstrap capacitor C Boost , upper power tube HS, lower power tube LS and inductor L, when the lower power tube LS is turned on, the bootstrap capacitor C Boost The charging circuit is turned on.

[0082] Figure 6 It is a schematic structural diagram of a start-up control device for a step-up DC converter provided by Embodiment 2 of the present invention. ...

Embodiment 3

[0090] Based on the above examples, Figure 7 It is a schematic structural diagram of a switching power supply provided by Embodiment 3 of the present invention.

[0091] Such as Figure 7 As shown, the switching power supply 1 includes the start-up control device 00 for the step-up DC converter described above.

[0092] In this embodiment, the switching power supply 1 may be a step-up DC converter, or a switching device provided with a step-up DC converter.

[0093] The switching power supply provided by the embodiment of the present invention is provided with a start-up control device, and the device executes a start-up control method. The method sets the bootstrap capacitor pre-charging stage, the output voltage compensation stage and the output voltage boost stage to be executed sequentially. In the pre-charging stage, the lower power tube is controlled to be turned on and off periodically, and the upper power tube is controlled to keep off until the voltage across the b...

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Abstract

The invention discloses a boost type direct current converter starting control method and device and a switching power supply. The method comprises a bootstrap capacitor pre-charging stage, an output voltage supplementing stage and an output voltage boosting stage which are executed in sequence. In the pre-charging stage of the bootstrap capacitor, the lower power tube is controlled to be switched on and switched off periodically, and the upper power tube is controlled to be switched off until the voltage at the two ends of the bootstrap capacitor reaches a pre-charging voltage threshold value; in the output voltage supplementing stage, the lower power tube is controlled to be kept switched off, and the grid voltage of the upper power tube is controlled to be gradually increased; and in the output voltage rising stage, the upper power tube and the lower power tube are controlled to be switched on alternately based on the preset soft start driving signal, and the duty ratio of the preset soft start driving signal is controlled to be gradually increased until the output voltage of the converter reaches the preset output voltage. The inductive current is reduced through a segmented control strategy, meanwhile, it is guaranteed that the charging voltage of the bootstrap circuit meets the starting requirement, current overshoot is avoided, and the safety and reliability of the circuit are improved.

Description

technical field [0001] The invention relates to the technical field of DC converter control, in particular to a method and device for starting and controlling a step-up DC converter and a switching power supply. Background technique [0002] In direct current converter (DC / DC) applications, the output voltage is gradually increased from a low potential to a preset voltage to complete the converter start-up. Due to the existence of the output capacitor in the circuit, the output capacitor needs to be charged during the starting process and the load current is provided at the same time. In order to prevent the excessive current during the starting process from causing damage to the circuit system, the current size needs to be limited. The commonly used current limiting method is to slowly increase the duty cycle of the PWM signal during the rising process, so that it gradually changes from the minimum value to the value required for normal operation after a long period of time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/34H02M1/088H02M3/158
CPCH02M1/36H02M1/34H02M1/088H02M3/158Y02B70/10
Inventor 李征
Owner 南京融芯微电子有限公司
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