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Step-up DC converter startup control method, device and switching power supply

A DC converter and step-up 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 exceeding the safety range of current and affecting circuit reliability and safety , 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: 2022-07-12
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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  • Step-up DC converter startup control method, device and switching power supply
  • Step-up DC converter startup control method, device and switching power supply
  • Step-up DC converter startup control method, device and switching power supply

Examples

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Embodiment 1

[0028] The first embodiment of the present invention provides a start-up control method for a boost-type DC converter. This embodiment can be applied to an application scenario where segmented control is performed at the start-up stage of a boost-type DC converter. The method can be controlled by the 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] Incorporate references figure 1 shown, the boost DC converter is provided with 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 loop of the bootstrap capacitor is turned on.

[0030] In this embodiment, the step-up DC converter startup control method includes: a bootstrap capacitor precharging stage, an output voltage complementing stage, and an output voltage boosting...

Embodiment 2

[0080] Based on the above-mentioned embodiments, the second embodiment of the present invention provides a step-up DC converter startup control device. The startup control device provided in the embodiment of the present invention can execute the startup control method provided by any embodiment of the present invention, and has the ability to execute 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, which are performed in sequence.

[0081] Incorporate references figure 1 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 bootstrap capacitor C Boost The charging circuit is turned on.

[0082] Image 6 This is a schematic structural diagram of a start-up control device for a boost-type DC ...

Embodiment 3

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

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

[0092] In this embodiment, the switching power supply 1 may be a boost-type DC converter, or a switching device provided with a boost-type 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. 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 be kept turned off until the voltage across the bootstrap capacitor reaches the pre-charge voltage threshold. ;In the output voltage compensation stage, the power tube under control is kept off, and the...

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Abstract

The invention discloses a step-up DC converter startup control method, device and switching power supply. The method includes: a bootstrap capacitor precharging stage, an output voltage complementing stage and an output voltage boosting stage which are executed in sequence; In the charging stage, the lower power tube is controlled to be turned on and off periodically, and the upper power tube is controlled to keep turned off until the voltage across the bootstrap capacitor reaches the precharge voltage threshold; in the output voltage compensation stage, the lower power tube is kept turned off, and the control The grid voltage of the upper power tube gradually increases; in the output voltage rising stage, the upper power tube and the lower power tube are controlled to be turned on alternately based on the preset soft-start drive signal, and the duty cycle of the preset soft-start drive signal is controlled to gradually increase , until the output voltage of the converter reaches the preset output voltage. The invention reduces the inductor current through a segmented control strategy, and at the same time ensures that the charging voltage of the bootstrap circuit meets the starting requirements, avoids current overshoot, and improves circuit safety and reliability.

Description

technical field [0001] The present invention relates to the technical field of DC converter control, in particular to a method and device for starting control of a boost type DC converter, and a switching power supply. Background technique [0002] In direct current converter (DC / DC) applications, the output voltage is gradually raised 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 current from being too large during the starting process and 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 in the rising process, so that it gradually changes from the minimum value to the value required for normal operation over a long peri...

Claims

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Application Information

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Patent Type & Authority Patents(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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