External power supply identification circuit for large current touch equipment and electronic signature screen

A high current, power supply voltage technology, applied in the electronic field, can solve the problems of unable to meet the power supply requirements of high current electronic signature screens, insufficient USB power supply, etc.

Active Publication Date: 2016-10-05
SHENZHEN UNIPEN TOUCH TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide an external power supply identification circuit for high-current touch devices, aiming to solve the problem that the existing USB power supply is insufficient and cannot meet the power supply requirements of high-current electronic signature screens

Method used

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  • External power supply identification circuit for large current touch equipment and electronic signature screen
  • External power supply identification circuit for large current touch equipment and electronic signature screen
  • External power supply identification circuit for large current touch equipment and electronic signature screen

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0017] In the embodiment of the present invention, when there is no external power adapter, a low-current USB power supply is used. When the USB power supply is insufficient, the external power adapter is used to supply power, and the USB power supply circuit is blocked at the same time to prevent the current of the power adapter from pouring current into the USB bus. , Solve the problem of insu...

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Abstract

The invention is suitable for the field of electronics and provides an external power supply identification circuit for large current touch equipment and an electronic signature screen. The circuit comprises a USB (universal serial bus) detection unit, a DC (direct current) detection unit, an identification control unit and a filtering unit, wherein the USB detection unit is used for generating a USB detection signal during external USB power supply; the DC detection unit is used for generating a DC detection signal and DC power supply voltage/current during external DC power supply; the identification control unit is used for outputting USB power supply voltage/current when the USB detection signal is only received and stopping outputting USB power supply voltage/current when the DC detection signal is received; the filtering unit is used for filtering USB power supply voltage/current or DC power supply voltage/current. The circuit has the beneficial effects that low current USB power supply is used without external power adapters; under the condition of insufficiency of USB power supply, power is supplied by the external power adapters, and meanwhile, a USB power supply circuit is blocked to prevent the current of the power adapters from flowing back to the USB, thus solving the problem of insufficiency of USB power supply.

Description

technical field [0001] The invention belongs to the field of electronics, and in particular relates to an external power supply identification circuit and an electronic signature screen for high-current touch devices. Background technique [0002] With the development of electronic technology, electronic signature screens have been widely used in finance, mobile business, and paperless office systems. At present, most of the electronic signature screens on the market use USB for power supply. With the increasing requirements for the response speed and display effect of electronic signature screens, the size of liquid crystal displays (Liquid Crystal Display, LCD) is getting larger and larger. The operating current required by the signature screen is also increasing, and the current that the traditional USB power supply method can provide is limited, which can no longer meet the new power supply demand. Contents of the invention [0003] The purpose of the embodiments of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/40G06F3/044G06F3/046
Inventor 万君枫
Owner SHENZHEN UNIPEN TOUCH TECH CO LTD
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