Boosting converter, controller for boosting converter and short circuit protection method

A boost converter and short-circuit protection technology, which is applied in the protection of overcurrent response, emergency protection device for automatic disconnection, emergency power supply protection, etc., can solve device damage, inaccurate short-circuit judgment, and untimely short-circuit judgment And other issues

Active Publication Date: 2014-04-23
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the conduction threshold voltage of the external short-circuit protection switch is large, the T1 period is longer, that is, the T2 period is short, the output capacitor in the switch circuit may not be charged enough, and the short-circuit judgment is inaccurate; if the conducti

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  • Boosting converter, controller for boosting converter and short circuit protection method
  • Boosting converter, controller for boosting converter and short circuit protection method
  • Boosting converter, controller for boosting converter and short circuit protection method

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Embodiment Construction

[0016] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0017] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a boosting converter, a controller for the boosting converter and a short circuit protection circuit; the boosting converter comprises a short circuit protection switch and a switch tube; when the boosting converter is started, the switch tube is conducted to provide a control voltage to the short circuit protection switch, so the short circuit protection switch is gradually conducted; whether the current flowing by the switch tube is larger than a preset value is judged, if the current is larger than the preset value, the switch tube is disconnected, and timing is performed at the same time; after the timing is performed for a certain period, whether the boosting converter is subjected to the output short circuit is detected, if the boosting converter is subjected to the output short circuit, the short circuit protection switch is disconnected, and protection is provided for the boosting converter.

Description

technical field [0001] The invention relates to an electronic circuit, in particular to a boost converter, a controller thereof and a short circuit protection method. Background technique [0002] In a boost converter, an output short circuit can damage the device. Therefore, short-circuit protection should be provided for the boost converter. [0003] An existing short-circuit protection method is to couple a short-circuit protection switch between the switch circuit of the boost converter and the input voltage. When an output short circuit of the boost converter is detected, the short circuit protection switch is turned off, thereby realizing short circuit protection. [0004] In order to save costs and / or improve circuit characteristics, an external short-circuit protection switch is often used in the prior art. For an external short-circuit protection switch, its turn-on threshold voltage is usually unknown. Therefore, when designing the control chip of the boost con...

Claims

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Application Information

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IPC IPC(8): H02H7/10H02H3/08H02M3/155
CPCH02H7/1213H02H1/06H02H3/093
Inventor 李伊珂郭王瑞
Owner CHENGDU MONOLITHIC POWER SYST
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