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Load Drive and Protection Circuits

A protection circuit and load driving technology, which is applied in the electronic field, can solve problems such as circuit failure and load requirements, and achieve the effects of wide load, control and short circuit protection

Active Publication Date: 2022-07-29
杭州海康消防科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for short-circuit protection by sensing the voltage across the power switching device, there are requirements on the load
When carrying a large capacitive load, the voltage of the power switching device is affected by the capacitive load. When the load is not short-circuited, the voltage exceeds the threshold, and the phenomenon of directly entering the short-circuit protection occurs, causing the circuit to fail to start.

Method used

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  • Load Drive and Protection Circuits
  • Load Drive and Protection Circuits
  • Load Drive and Protection Circuits

Examples

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Embodiment Construction

[0011] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this application. Rather, they are merely examples of means consistent with some aspects of the present application as recited in the appended claims.

[0012] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, technical or scientific terms used in this application shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. "First", "second" and similar words used in the description...

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Abstract

The present application provides a load driving and protection circuit. The load driving and protection circuit includes a main circuit, a control circuit and a short-circuit protection circuit. The main circuit includes a power switching device connected in series with the load and a sampling circuit connected with the power switching device. The control circuit is connected to the power switching device and the sampling circuit of the main circuit, and is used for receiving the sampling signal of the sampling circuit, and controlling the power switching device according to the sampling signal to control at least one of the voltage and current of the load. The short-circuit protection circuit is connected with the sampling circuit and the control circuit, and is used for receiving the sampling signal of the sampling circuit. When the sampling signal exceeds the threshold of the short-circuit signal, it outputs a short-circuit protection signal to the control circuit, so that the control circuit controls the power switch device to turn off.

Description

technical field [0001] The present application relates to the field of electronic technology, and in particular, to a load driving and protection circuit. Background technique [0002] The load driving and protection circuit can be used to drive the load and protect it when the load is short-circuited. A load driving and protection circuit changes the current flowing through the loop by controlling the turn-on and turn-off of the power switch device connected to the load, realizes the drive of the load, and detects the voltage on the power switch device, and when the voltage exceeds a threshold value When the short-circuit protection is triggered, the power switch device is prevented from being damaged. However, short-circuit protection by sensing the voltage on the power switching device imposes a requirement on the load. When carrying a large capacitive load, the voltage of the power switching device is affected by the capacitive load. When the load is not short-circuite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/569H02H1/00H02H3/20
CPCG05F1/569H02H3/20H02H1/0007
Inventor 徐崇洁
Owner 杭州海康消防科技有限公司
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