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Multimedia data card

A data card and multimedia technology, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problems that multimedia data cards cannot be quickly discharged, and avoid failure or even damage. Enhance the service life and work reliability, the effect of good protection

Active Publication Date: 2012-07-04
山东颐德电气设备工程有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a multimedia data card, which aims to solve the technical defect that the multimedia data card cannot be quickly discharged in the prior art

Method used

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Embodiment Construction

[0014] 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.

[0015] see figure 2 As shown in , the preferred embodiment of the multimedia data card of the present invention is to set a fast discharge circuit in the original multimedia data card, and the fast discharge circuit includes a low conduction threshold P-channel field effect transistor U1 and a discharge current adjusting resistor R1, the gate G of the low conduction threshold P-channel FET U1 is connected to the input terminal of the 5V power supply of the USB interface, the source S is connected to the positive pole of the large-capacity energy storage tantalum capacitor C4, and the drain D is co...

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Abstract

The invention provides a multimedia data card, comprising a USB interface, a switch power supply switching circuit, a data card baseband circuit, a data card radio frequency circuit, an energy storage tantalum capacitor and a quick discharge circuit. The quick discharge circuit comprises a low conduction threshold P slot field-effect transistor and a discharge current regulation resistor, whereinthe grid of the low conduction threshold P slot field-effect transistor is connected with the USB interface, while the source level is connected with the anode of the energy storage tantalum capacitor, and the drain is connected with the discharge current regulation resistor. The multimedia data card, through ingenious application of the discharge circuit, avoids invalidation even damage when thedata card is plugged and unplugged because of discharge effect of the large-bulk energy storage tantalum capacitor C4, plays a good role of protection, and improves the service life and the working reliability of the multimedia data card.

Description

technical field [0001] The invention relates to an improved multimedia data card in the field of mobile communication. Background technique [0002] Such as figure 1 As shown in , the enhanced multimedia data card generally includes a USB interface 10, a switching power supply conversion circuit 11, a data card baseband circuit 12, and a data card radio frequency circuit 13. The USB interface 10 of the data card provides a 5V / 500mA DC power supply, while the power supply requirement of a general multimedia data card is a 4V DC power supply. Therefore, the above-mentioned switching power supply conversion circuit 11 needs to be used to convert the 5V DC power input from the USB interface into a 4V / 500mA DC power supply. 500mA DC power output, the 4V DC power supplies power to the baseband circuit 12 of the data card and the radio frequency circuit 13 of the data card. Since the multimedia data card supports multi-mode modes such as TD-SCDMA / HSDPA, GSM / EDGE, etc., these comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
Inventor 苏海波
Owner 山东颐德电气设备工程有限公司
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