CN211627651U - Low-power-consumption liquid crystal backlight ammeter - Google Patents
Low-power-consumption liquid crystal backlight ammeter Download PDFInfo
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- CN211627651U CN211627651U CN201922222286.9U CN201922222286U CN211627651U CN 211627651 U CN211627651 U CN 211627651U CN 201922222286 U CN201922222286 U CN 201922222286U CN 211627651 U CN211627651 U CN 211627651U
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Abstract
The utility model provides a low-power consumption's liquid crystal ammeter in a poor light, includes the drain pan, cup joints the upper cover on the drain pan, be equipped with SoC integrated chip, main power supply, circuit module, output module, display module, infrared communication module, data storage module in the drain pan, circuit module inserts SoC integrated chip, SoC integrated chip control circuit module produces the signal of telecommunication and collects the signal of telecommunication that circuit module produced, and circuit module includes voltage sampling circuit, voltage sampling circuit carries out real-time AD sampling and handles the voltage value that the sampling value obtained after handling to ammeter voltage, carries out the segmentation to display module's demonstration. The design has the advantages of low cost, long working lighting time and dynamically adjustable backlight power consumption.
Description
Technical Field
The utility model relates to an ammeter field, especially a liquid crystal ammeter in a poor light of low-power consumption.
Background
Along with the development of Chinese economy, the demand of electric energy is continuously increased, electric meters are popularized and applied nationwide, and the demand of various industries on the electric meters is continuously increased. Although the existing electric meter is widely used and the technology thereof is mature, part of problems still exist in the application process, for example, in countries and regions where the power grid construction is relatively incomplete, especially in some countries behind relatively, because the voltage fluctuation of the whole power grid is large and unstable, the electric meter needs to be capable of normally performing metering work under an extremely low voltage environment, and the liquid crystal backlight is kept on or on constantly in real time, so that meter reading personnel can conveniently read and record data, most of the existing electric meters cannot meet the requirements, so that the use process is inconvenient, on the other hand, most of the existing electric meters capable of working under low voltage adopt a scheme of controlling the backlight of a power switch, namely, the backlight can be provided and the display screen of the electric meter can be lighted after the backlight switch is turned on, and the backlight can not be provided and further the meter reading can not be performed after the backlight switch is turned off, the circuit design of the scheme is difficult, the whole circuit is complex and high in cost, and the backlight can not be provided for long time.
Disclosure of Invention
An object of the utility model is to provide a low-power consumption's liquid crystal ammeter in a poor light of low cost, operating time length, the dynamic adjustment of consumption in a poor light.
In order to solve the technical problem, the utility model discloses a following technical scheme: a low-power consumption liquid crystal backlight ammeter comprises a bottom shell and an upper cover covering the bottom shell, wherein an SoC integrated chip, a main power supply, a circuit module, an output module, a display module, an infrared communication module and a data storage module are arranged in the bottom shell;
the main power supply is connected with the SoC integrated chip and provides power for the electrification work of the electric meter, and a resistance element is also arranged in the main power supply for carrying out resistance-capacitance voltage reduction of the main power supply and realizing wide voltage input;
the SoC integrated chip comprises a microcontroller for controlling the operation of an ammeter system and a metering module for metering the ammeter, wherein the microcontroller transmits digital signals generated by conversion of the metering module to an output module, a display module and an infrared communication module, and stores digital information generated by conversion of the metering module to a data storage module;
the output module comprises an LED module and a pulse output module;
the display module comprises an LCD display screen and a backlight plate, the LCD display screen is arranged on the upper cover and used for displaying various parameters of the electric meter, and the backlight plate is used for displaying electronic parameter data of the electric meter;
the infrared communication module comprises an infrared communication device and an RS485 communication device, and data transmission between the ammeter and external equipment of the ammeter is realized through the cooperation of the RS485 communication device and the infrared communication device, so that the wireless data transmission is realized;
the circuit module inserts SoC integrated chip, SoC integrated chip control circuit module produces the signal of telecommunication and collects the signal of telecommunication that circuit module produced, and circuit module includes voltage sampling circuit, voltage sampling circuit carries out real-time AD sampling and handles the voltage value after the sampling value obtains handling to ammeter voltage, carries out segmentation processing to display module's demonstration.
Furthermore, the circuit module also comprises a power-down and power-up detection circuit, and a dummy load element is connected in the power-down and power-up detection circuit.
Furthermore, the circuit module further comprises a power supply voltage detection circuit for detecting the working state of the main power supply of the electric meter, when the main power supply of the electric meter is in a normal working state, the power supply voltage detection circuit is awakened at regular time through the RTC after power failure, peripheral voltage and current are detected, and different-frequency working condition processing and corresponding metering processing are carried out according to the detected actual value.
Further, a standby battery is further arranged in the bottom shell, and the standby battery is connected with the SoC integrated chip and provides power needed by the work of the data storage module and the display module for the electric meter when the main power supply cannot provide power.
Further, a timer is further arranged in the bottom shell, the timer subdivides the time slices through timed interruption, the time slices occupied by the liquid crystal backlight are different corresponding to different voltage gears, the power consumption of the liquid crystal backlight is dynamically adjusted, and the backlight is normally displayed.
The utility model has the advantages that: the utility model discloses the design of the resistance-capacitance step-down of main power supply is simple, make things convenient for the design overall arrangement of whole main power supply circuit board, realize wide voltage input, compare in the direct manufacturing cost who reduces the main power supply by a wide margin of current power design scheme, the cost of main power supply is very cheap, on the other hand, circuit analysis and a large amount of data sampling through SoC integrated chip, to different voltage range microcontroller dominant frequencies, the peripheral equipment consumption, the consumption of liquid crystal backlight plate carries out different settings or corresponding restriction, it carries out corresponding change to correspond different voltage gears after handling circuit actual voltage, the normal backlight display of guaranteeing liquid crystal backlight plate when making the ammeter normally carry out the work measurement under the low-voltage, can stabilize normal work for a long time under the low-power consumption.
Drawings
Fig. 1 is a schematic diagram of an overall structure of a liquid crystal backlight electricity meter with low power consumption.
FIG. 2 is a system block diagram of a low power consumption LCD backlight electric meter.
Fig. 3 is a power down and power up detection circuit diagram.
Fig. 4 is a voltage sampling circuit diagram.
Fig. 5 is a battery voltage detection circuit diagram.
Fig. 6 is a flow chart of the operation of a low power consumption lcd backlight power meter.
The part names numbered in the drawings are as follows: 1. an upper cover; 2. a bottom shell.
Detailed Description
In order to make the utility model realize the technical means, innovative features and functions are easy to understand, and the utility model is further explained below.
As shown in fig. 1-6, the technical solution of the low power consumption lcd backlight electric meter of the present invention includes a bottom case 2, and an upper cover 1 covering the bottom case 2, wherein the bottom case 2 is provided with an SoC integrated chip, a main power supply, a circuit module, an output module, a display module, an infrared communication module, and a data storage module;
the main power supply is connected with the SoC integrated chip and provides power for the electrification work of the electric meter, and a resistance element is also arranged in the main power supply for carrying out resistance-capacitance voltage reduction of the main power supply and realizing wide voltage input;
the SoC integrated chip comprises a microcontroller for controlling the operation of an ammeter system and a metering module for metering the ammeter, wherein the microcontroller transmits digital signals generated by conversion of the metering module to an output module, a display module and an infrared communication module, and stores digital information generated by conversion of the metering module to a data storage module;
the output module comprises an LED module and a pulse output module;
the display module comprises an LCD display screen and a backlight plate which are arranged on the upper cover 1, the LCD display screen displays various parameters of the electric meter, and the backlight plate displays electronic parameter data of the electric meter;
the infrared communication module comprises an infrared communication device and an RS485 communication device, and data transmission between the ammeter and external equipment of the ammeter is realized through the cooperation of the RS485 communication device and the infrared communication device, so that the wireless data transmission is realized;
the circuit module inserts SoC integrated chip, SoC integrated chip control circuit module produces the signal of telecommunication and collects the signal of telecommunication that circuit module produced, and circuit module includes voltage sampling circuit, voltage sampling circuit carries out real-time AD sampling and handles the voltage value after the sampling value obtains handling to ammeter voltage, carries out segmentation processing to display module's demonstration.
Because need guarantee that the telegram can work steadily for a long time, in order to ensure that the ammeter can supply power steadily, when practical application, still can still set up backup battery in drain pan 2, backup battery is connected with SoC integrated chip and provides data storage module and display module work required power for the ammeter when the main power supply can't provide the power, under the unable normal operating's such as main power supply trouble or maintenance circumstances, the ammeter normal work still can be guaranteed to backup power, avoids the ammeter outage problem because of the unable normal power supply of main power supply appears, promotes the stability of ammeter operation.
As shown in fig. 3, in order to prevent the voltage jitter of the electric meter, avoid the repeated power-on and power-off of the electric meter and ensure the stable and normal operation of the electric meter for a long time, the circuit module further comprises a power-off and power-on detection circuit, and a dummy load element is connected in the power-off and power-on detection circuit.
As shown in fig. 5, the circuit module further includes a power supply voltage detection circuit for detecting a working state of the main power supply of the electric meter, when the main power supply of the electric meter is in a normal working state, the power supply voltage detection circuit is awakened periodically by the RTC after power down, peripheral voltage and current are detected, and different frequency working condition processing and corresponding metering processing are performed according to a detected actual value.
As shown in fig. 6, the operation flow of the liquid crystal backlight electric meter with low power consumption of the present invention is as follows:
1. after the electric meter starts to operate, whether the electric meter can normally start the frequency operation of more than 800Khz is checked by checking the VDCIN state bit arranged on the upper cover 1, if the electric meter cannot normally start and return, the step 2 is entered if the electric meter normally starts.
2. After the frequency above 800Khz is started, initializing a sampling channel and metering related parameters.
3. The method comprises the steps of detecting the voltage of a main power supply at regular time, carrying out RTC awakening configuration after power failure if the voltage of the main power supply is normal, awakening at regular time to carry out constant metering, and switching different gears according to detected sampling voltage.
4. Sampling an instant value by using the voltage AD, and dividing the sampled working condition voltage into different gears by adopting a debounce algorithm.
5. And determining a reasonable gear division by calculating the actual power consumption and combining with the sampling data, and sampling different display frequencies at different gears. When the voltage is more than 170V and the frequency is more than 3.2M, the full-speed operation is carried out; when the voltage is less than 170V and floats around 120V, the frequency is properly reduced and the distribution of backlight display time slices is reduced; when the voltage is more than 90V and the rain is 120V, closing unnecessary peripherals and continuously reducing the distribution of backlight display time slices; when the voltage is more than 70V and less than 90V, the communication peripheral is closed, and the distribution of backlight display time slices is urgently needed; and (6) when the voltage is more than 70V, turning to step 7 to operate, and when the voltage is less than 70V.
6. The method has the advantages that the rotation scheduling of the electric meter time slices is realized by using the timer, the corresponding peripheral equipment is closed according to the determined gear under the condition that the electric meter works normally, the corresponding refreshing frequency corresponding to the voltage is adopted, the normal function of the electric meter is ensured, and the normal backlight display is realized.
7. And if the power consumption is reduced to below 70V, the backlight is closed, the metering module is used for saving the electric quantity, and the low-power-consumption mode is entered.
8. If the main power supply voltage is normal at the moment, RTC interruption is set, timing awakening is carried out, whether the ammeter normally works or not is checked after awakening, step 5 is carried out after normal working, otherwise sleep is carried out to wait for awakening next time, and further detailed division can be carried out on RTC awakening time according to the size of sampling current.
Although the present invention has been described with reference to the specific embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A liquid crystal backlight ammeter with low power consumption is characterized in that: the intelligent display device comprises a bottom shell (2) and an upper cover (1) covered on the bottom shell (2), wherein an SoC integrated chip, a main power supply, a circuit module, an output module, a display module, an infrared communication module and a data storage module are arranged in the bottom shell (2);
the main power supply is connected with the SoC integrated chip and provides power for the electrification work of the electric meter, and a resistance element is also arranged in the main power supply for carrying out resistance-capacitance voltage reduction of the main power supply and realizing wide voltage input;
the SoC integrated chip comprises a microcontroller for controlling the operation of an ammeter system and a metering module for metering the ammeter, wherein the microcontroller transmits digital signals generated by conversion of the metering module to an output module, a display module and an infrared communication module, and stores digital information generated by conversion of the metering module to a data storage module;
the output module comprises an LED module and a pulse output module;
the display module comprises an LCD display screen and a backlight plate which are arranged on the upper cover (1), the LCD display screen displays various parameters of the electric meter, and the backlight plate displays electronic parameter data of the electric meter;
the infrared communication module comprises an infrared communication device and an RS485 communication device, and data transmission between the ammeter and external equipment of the ammeter is realized through the cooperation of the RS485 communication device and the infrared communication device, so that the wireless data transmission is realized;
the circuit module inserts SoC integrated chip, SoC integrated chip control circuit module produces the signal of telecommunication and collects the signal of telecommunication that circuit module produced, and circuit module includes voltage sampling circuit, voltage sampling circuit carries out real-time AD sampling and handles the voltage value after the sampling value obtains handling to ammeter voltage, carries out segmentation processing to display module's demonstration.
2. The liquid crystal backlight ammeter with low power consumption as claimed in claim 1, wherein: the circuit module also comprises a power-down and power-up detection circuit, and a dummy load element is connected in the power-down and power-up detection circuit.
3. A low power consumption lcd backlight meter as claimed in claim 1 or 2, wherein: the circuit module further comprises a power supply voltage detection circuit for detecting the working state of the main power supply of the electric meter, when the main power supply of the electric meter is in a normal working state, the power supply voltage detection circuit is awakened regularly through the RTC after power failure, peripheral voltage and current are detected, and different-frequency working condition processing and corresponding metering processing are carried out according to the detected actual value.
4. A low power consumption lcd backlight meter as claimed in claim 1 or 2, wherein: still be equipped with backup battery in drain pan (2), backup battery is connected with SoC integrated chip and provides data storage module and display module work required power for the ammeter when the main power supply can't provide the power.
5. The liquid crystal backlight ammeter with low power consumption as claimed in claim 3, wherein: still be equipped with backup battery in drain pan (2), backup battery is connected with SoC integrated chip and provides data storage module and display module work required power for the ammeter when the main power supply can't provide the power.
6. A low power consumption lcd backlight meter as claimed in claim 1, 2 or 5, wherein: the bottom shell (2) is also internally provided with a timer, the timer subdivides the time slices through timing interruption, the time slices occupied by the liquid crystal backlight are different corresponding to different voltage gears, the power consumption of the liquid crystal backlight is dynamically adjusted, and the backlight is normally displayed.
7. The liquid crystal backlight ammeter with low power consumption as claimed in claim 3, wherein: the bottom shell (2) is also internally provided with a timer, the timer subdivides the time slices through timing interruption, the time slices occupied by the liquid crystal backlight are different corresponding to different voltage gears, the power consumption of the liquid crystal backlight is dynamically adjusted, and the backlight is normally displayed.
8. The liquid crystal backlight ammeter with low power consumption as claimed in claim 4, wherein: the bottom shell (2) is also internally provided with a timer, the timer subdivides the time slices through timing interruption, the time slices occupied by the liquid crystal backlight are different corresponding to different voltage gears, the power consumption of the liquid crystal backlight is dynamically adjusted, and the backlight is normally displayed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922222286.9U CN211627651U (en) | 2019-12-12 | 2019-12-12 | Low-power-consumption liquid crystal backlight ammeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922222286.9U CN211627651U (en) | 2019-12-12 | 2019-12-12 | Low-power-consumption liquid crystal backlight ammeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305282A (en) * | 2020-10-10 | 2021-02-02 | 浙江晨泰科技股份有限公司 | Ammeter with uncap and detect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305282A (en) * | 2020-10-10 | 2021-02-02 | 浙江晨泰科技股份有限公司 | Ammeter with uncap and detect |
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