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Digital display device

A technology of digital display and display device, which is applied in identification devices, signal transmission systems, instruments, etc., can solve the problems of unstable output voltage and frequency, failure data cannot be read normally, and cannot work, etc. Scene rich effects

Active Publication Date: 2021-08-24
王运良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for some mid-to-high-end tables with monitoring and fault data recording functions, this method is slightly insufficient
[0005] In addition, when the output voltage and frequency are unstable or even have no AC output due to the failure of the AC power generation equipment, the digital display device with the fault record storage function cannot work due to the lack of AC power supply, and the fault data stored in it cannot be normalized. read

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, in this example, the two terminals of the power supply interface 1 (AC input interface) are terminal 1a and terminal 1b respectively. The power supply circuit 2 includes a step-down rectifier module 21 , a capacitor 22 , an LDO voltage stabilizing device 23 and a capacitor 24 . The power consumption circuit includes an MCU 3 , a step-down circuit 7 , and an equivalent low-voltage load 8 . The step-down circuit 7 includes a voltage dividing resistor 71 and a voltage dividing resistor 72 . The equivalent low-voltage load 8 includes modules or components such as a display and an infrared receiver.

[0038] The function expansion interface 9 has a two-terminal structure, including a terminal 9A and a terminal 9B. Terminal 9A is connected to ADC pin of microcontroller MCU 3 through resistor 4 . The terminal 9B is connected between the voltage dividing resistor 71 and the voltage dividing resistor 72 of the step-down circuit 7 , and is connected...

Embodiment 2

[0048] This embodiment is basically the same as Embodiment 1, the difference is: the terminal 9A of the two-pin function expansion interface 9 is connected to the ADC pin of the microcontroller MCU 3 through a resistor 4, and connected to the LDO voltage stabilizing device 23 through a diode Output terminal positive. The terminal 9B is connected between the voltage dividing resistor 71 and the voltage dividing resistor 72 of the step-down circuit 7, and a transformer sampling resistor 6 is connected in parallel between the terminal 9A and the terminal 9B.

[0049] When there is no AC input at both ends 1a and 1b of the power supply interface 1, connect the positive pole of the 5V DC power supply to the terminal 9A of the function expansion interface 9, and connect the negative pole of the 5V DC power supply to the terminal 1a of the power supply interface, so as to realize DC power supply to the display device .

Embodiment 3

[0051] This embodiment is basically the same as Embodiment 1, except that the terminal 9A of the two-pin function expansion interface 9 is connected to the ADC pin of the microcontroller MCU 3 through a resistor 4 . The terminal 9B is only connected to the negative output terminal of the power supply circuit 2 through the resistor 72 , and connected to the positive output terminal of the LDO voltage stabilizing device 23 through the diode 5 . A transformer sampling resistor 6 is connected in parallel between terminal 9A and terminal 9B.

[0052] When the two ends of the function expansion interface 9 are connected to the current transformer, the current transformer outputs an AC voltage signal proportional to the current detected by the transformer through the transformer sampling resistor 6, and the negative half cycle of the signal will be clamped by the protection diode in the MCU to supply power. The output terminal of the circuit 2 is negative, and the MCU 3 realizes the ...

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PUM

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Abstract

Aiming at the characteristics of strong function and multiple display parameters of a digital instrument, the invention provides a digital display module which is powered by input alternating current and comprises a power supply interface, a power supply circuit, a power consumption circuit and a function expansion interface, the function expansion interface comprises a terminal A and a terminal B, and when the digital display module is externally connected with a current transformer, the measurement display of current can be realized; a certain pin of the function expansion interface and a certain pin of the alternating current power supply interface are used in a combined mode, and different functions can be achieved.

Description

technical field [0001] The invention relates to a digital display device, which is especially suitable for AC generator sets, inverter power supplies and other AC output electrical equipment. Background technique [0002] Common electrical equipment such as inverter power supplies and alternator sets on the market are generally equipped with display instruments. With the advancement of digital technology in recent years, the use of digital smart meters on this type of equipment has become more and more popular. In addition to the voltage, current and other parameter indication functions of old-fashioned pointer meters, some of them also have fault data recording and storage functions. Users The operation history information can be recorded through the instrument to provide data support for the later maintenance of the equipment. [0003] Due to the many functions of digital instruments, there are generally one or more buttons for parameter setting or display data switching....

Claims

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Application Information

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IPC IPC(8): G08C23/04G09F9/30H05K5/06H01R13/52
CPCG08C23/04G09F9/30H05K5/06H01R13/52
Inventor 王运良陈伟
Owner 王运良
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