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Protection circuit and switching power source

A technology for protecting circuits and power switches, applied in the electronic field, can solve problems such as inconvenient maintenance, high cost, and easily damaged devices, and achieve the effects of convenient maintenance, cost reduction, and simplified switching power supply structure

Active Publication Date: 2020-01-31
厦门科华数能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the embodiment of the present invention provides a protection circuit and a switching power supply to solve the problems that the traditional switching power supply fault detection and maintenance method is easy to damage the device, and the cost is high and the maintenance is inconvenient

Method used

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  • Protection circuit and switching power source

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Embodiment Construction

[0035] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0036] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

[0037] see figure 1 , a protection circuit provided in this embodiment may include: a detection module 100 , a short circuit feedback module 200 , a drive control module 300 and a power switch module 400 . The power switch module 400 is connected with the primary wind...

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Abstract

The invention belongs to the technical field of electronics and discloses a protection circuit and a switching power source. The protection circuit comprises a detection module, a short-circuit feedback module, a driving control module and a power source switching module; the power source switching module is connected with the primary winding of an external power source module; the acquisition endof the detection module is connected with the secondary winding of the external power source module; the output end of the detection module is connected with the input end of the short-circuit feedback module; the detection module is used for detecting the voltage signal of the secondary winding of the external power source module and outputting the voltage signal to the short-circuit feedback module; the output end of the short-circuit feedback module is connected with the input end of the driving control module; the short-circuit feedback module is used for preprocessing the voltage signaland outputting the preprocessed voltage signal to the driving control module; the driving control module is used for controlling the power source switching module to be turned off when the received voltage signal is lower than a first preset voltage value. With the protection circuit of the invention adopted, the automatic overcurrent or short circuit protection of each output branch is realized,and devices are not damaged. The protection circuit has the advantages of low cost and convenient maintenance.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a protection circuit and a switching power supply. Background technique [0002] In switching power supply applications, when the output current of the secondary winding is too large or a short circuit occurs, the output voltage of each secondary winding will drop. The traditional voltage detection and maintenance method is to detect the change of the output voltage and then feed it back to the main control chip. The control chip increases the duty cycle to maintain the stability of the output voltage, but only by increasing the duty cycle is easy to cause cascading damage to the faulty system components, and the traditional method of using the fuse increases the volume of the switching power supply, which is costly and requires maintenance. inconvenient. Contents of the invention [0003] In view of this, an embodiment of the present invention provides a prote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02M3/335H02M1/08
CPCH02H7/12H02H7/1213H02M3/33523H02M1/08
Inventor 陈书生苏先进曾春保
Owner 厦门科华数能科技有限公司
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