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Serial port protecting circuit of LED display screen control card

A technology of LED display screen and protection circuit, which is applied in the direction of emergency protection circuit device, emergency protection circuit device for limiting overcurrent/overvoltage, circuit device, etc., and can solve the problem of many restrictions on use, poor interference tolerance, and flexibility Poor performance and other problems, to achieve the effect of reducing production costs, high pressure and current resistance, and small attenuation

Inactive Publication Date: 2015-08-12
深圳市国瑧科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many protection devices suitable for circuit interfaces in the prior art, but there are many restrictions on their use and poor flexibility. Each device is only for a specific circuit interface and can only be produced by order. The cost is high, and for high Poor tolerance to high voltage, high current or high frequency interference

Method used

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  • Serial port protecting circuit of LED display screen control card
  • Serial port protecting circuit of LED display screen control card
  • Serial port protecting circuit of LED display screen control card

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] refer to Figure 1-8 , a specific embodiment of the present invention includes that the computer serial port output port PC_TXD is connected to the serial port chip receiving port UART1_TX, the computer serial port input port PC_RXD is connected to the serial port chip sending port UART1_RX, the computer serial port and the serial port chip are connected with a limited voltage chip, and the computer serial port output port There is a first current limiting circuit connected between PC_TXD and the receiving end UART1_TX of the serial port chip, and a second current limiting circuit is connected between the computer serial port input end PC_RXD and the sending end UART1_RX of the serial port chip; For shunting and stepping down, the first current limiting circuit and the second current limiting circuit are used to limit the current passing through the serial port.

[0028] It is worth noting that the voltage limiting chip adopts the PESD12VL2BT chip produced by Philips, a...

Embodiment 2

[0037] refer to Figure 9-10 , this embodiment is based on Embodiment 1, and an isolation circuit is provided between the first current limiting circuit and the first current stabilizing circuit, and between the second current limiting circuit and the second current stabilizing circuit.

[0038] The isolation circuit arranged between the first current limiting circuit and the first current stabilizing circuit includes a first phototransistor Q7, a first light emitting diode D3, and a sixth pull-down resistor R20, and the first current limiting circuit is connected to the first light emitting diode D3. Anode, the negative pole of the first light-emitting diode D3 is grounded, the first light-emitting diode D3 is coupled with the base of the first phototransistor Q7, the collector of the first phototransistor Q7 is connected to the high level Vcc, the emitter of the first phototransistor Q7 The sixth pull-down resistor R20 is grounded, and the first current stabilization circuit...

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PUM

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Abstract

The invention discloses a serial port protecting circuit of an LED display screen control card. A computer serial port output terminal is connected to a serial port chip receiving terminal; a computer serial port input terminal is connected to a serial port chip emitting terminal; a voltage limiting chip is connected between a computer serial port and a serial port chip; a first current limiting circuit is connected between the computer serial port output terminal and the serial port chip receiving terminal; and a second current limiting circuit is connected between the computer serial port input terminal and the serial port chip emitting terminal. The voltage limiting chip is used for performing shutting and voltage reduction of an extremely high input voltage, and the first current limiting circuit and the second current limiting circuit are used for limiting the current passing through the serial port. According to the invention, deficiencies in the prior art are overcome; the damage ratio of the serial port chip is reduced; and the serial port protecting circuit is applicable in a wide range, can be produced in a large scale, and is low in cost.

Description

technical field [0001] The invention relates to the technical field of LED display, in particular to a serial port protection circuit of an LED display control card. Background technique [0002] In the LED display control cards currently on the market, it is necessary to use the serial port to communicate with the computer in order to update the data. The existing products basically connect the serial port chip and the interface directly without any protection measures in between. During the operation, the serial communication chip is often damaged due to human body static electricity, improper operation and other reasons. According to statistics, the damage rate of serial chip can reach 15%. There are many protection devices suitable for circuit interfaces in the prior art, but there are many restrictions on their use and poor flexibility. Each device is only for a specific circuit interface and can only be made to order. The cost is high, and for high Poor tolerance to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H02H9/02H02H9/04G09G3/32
Inventor 马跃包健
Owner 深圳市国瑧科技有限公司