阅读说明：本技术 一种安全电能表 (Safe electric energy meter ) 是由 史建省 于 2021-03-05 设计创作，主要内容包括：本发明提供一种安全电能表,包括主控模块,主控模块连接有模数转换模块、电源模块以及显示模块；模数转换模块连接有电压采样模块和电流采样模块；电压采样模块采样用电负荷的电压值,电流采样模块采样用电负荷的电流值,模数转换模块将用电负荷的电压值及电流值转换为数字量,提供给主控模块,主控模块根据用电负荷电压值及电流值统计电能值,并判断用电负荷电流值是否超过额定电流,以及在超过额定电流时,记录超负荷的电流值,并统计超负荷电流持续时间,再将电能值、超负荷电流值及超负荷电流持续时间提供给显示模块。本发明提供的安全电能表,对超负荷电流进行统计,在进行电能统计时可有效考量电流超负荷带来的电能偏差,并避免安全隐患。(The invention provides a safe electric energy meter which comprises a main control module, wherein the main control module is connected with an analog-to-digital conversion module, a power supply module and a display module; the analog-to-digital conversion module is connected with a voltage sampling module and a current sampling module; the voltage sampling module samples the voltage value of the electric load, the current sampling module samples the current value of the electric load, the analog-to-digital conversion module converts the voltage value and the current value of the electric load into digital quantity and provides the digital quantity to the main control module, the main control module counts the electric energy value according to the voltage value and the current value of the electric load, judges whether the current value of the electric load exceeds the rated current, records the current value of the overload when the current value exceeds the rated current, counts the duration time of the overload current, and provides the electric energy value, the overload current value and the duration time of the overload current to the display module. The safe electric energy meter provided by the invention counts the overload current, can effectively consider the electric energy deviation caused by the overload current during the electric energy counting, and avoids potential safety hazards.)

1. A safe electric energy meter is characterized by comprising a main control module (1), wherein the main control module (1) is connected with an analog-to-digital conversion module (2), a power supply module (3) and a display module (4);

the power supply module (3) is also connected with the analog-to-digital conversion module (2);

the analog-to-digital conversion module (2) is connected with a voltage sampling module (5) and a current sampling module (6);

the voltage sampling module (5) samples the voltage value of the electric load (7), the current sampling module (6) samples the current value of the electric load (7), the analog-to-digital conversion module (2) converts the voltage value and the current value of the electric load (7) into digital quantity and provides the digital quantity to the main control module (1), the main control module (1) counts an electric energy value according to the voltage value and the current value of the electric load (7), judges whether the current value of the electric load (7) exceeds a rated current, records the overload current value when the current value exceeds the rated current, counts overload current duration, and provides the electric energy value, the overload current value and the overload current duration to the display module (4).

2. The safety electric energy meter according to claim 1, characterized in that the master control module (1) comprises an electric energy value statistical unit (1.1) and an overload current statistical unit (1.2);

the electric energy value counting unit (1.1) is used for acquiring a voltage value of the electric load (7) through the voltage sampling module (5), acquiring a current value of the electric load (7) through the current sampling module (6), counting the current value duration of the electric load (7), setting the current value duration as electric time, calculating an electric energy value according to the voltage value, the current value and the electric time of the electric load (7), and providing the electric energy value for the display module (4);

and the overload current counting unit (1.2) is used for comparing the current value of the overload according to the current value of the electric load (7) acquired by the current sampling module (6) and a current threshold value to count the current value of the overload, setting the current value as the overload current, and counting the duration of the overload current and the maximum value of the overload current to be provided for the display module (4).

3. The safety electric energy meter according to claim 2, wherein the electric energy value statistical unit (1.1) calculates a voltage effective value based on the sampled voltage value and the sampled power consumption time of the power consumption load (7), calculates a current effective value based on the sampled current value and the sampled power consumption time of the power consumption load (7), and calculates the electric energy value based on the voltage effective value, the current effective value, and the power consumption time.

4. A safety electric energy meter according to claim 2, characterized in that the display module (4) comprises an electric energy value display area (4.1) and an overload current display area (4.2);

the electric energy value display area (4.1) is used for displaying the electric energy value of the electric load (7) in real time;

and an overload current display area (4.2) for displaying the maximum value of the overload current and the duration of the overload current.

5. The safety electric energy meter according to claim 1, characterized in that the master control module (1) is further connected with a communication module (8), and the communication module (8) is connected with a remote electric energy collection terminal (9).

6. The safe electric energy meter according to claim 5, characterized in that the communication module (8) is an RS485 communication module or a wireless communication module.

7. The safe electric energy meter according to claim 1, characterized in that the power module (3) comprises a power conversion chip (3.1), the power conversion chip (3.1) is connected with a battery unit (3.2) and a filter power supply (3.3), the filter unit (3.3) is connected with a rectifying unit (3.4), the rectifying unit (3.4) is connected with a step-down transformer unit (3.5), and the step-down transformer unit (3.5) is connected with an alternating current voltage source (10);

the power conversion chip (3.1) is also connected with the main control module (1) and the analog-to-digital conversion module (2).

8. A safety electric energy meter according to claim 7, characterized in that the AC voltage source (10) is connected to the electric load (7) via a switch (11).

9. The safety electric energy meter according to claim 8, characterized in that the current sampling module (6) comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2;

the electrical load (7) comprises a first terminal, a second terminal and a third terminal;

a first terminal of the electric load (7) is connected with one end of an alternating current voltage source (10) through a switch (11), a second terminal of the electric load (7) is connected with the other end of the alternating current voltage source (10), and a third terminal of the electric load (7) is grounded;

a first current sampling point and a second current sampling point are arranged between a first terminal of the electric load (7) and the switch (11), the first current sampling point is connected with a first resistor R1, the other end of the first resistor R1 is connected with a first capacitor C1 and is connected with a first current sampling output point A1, and the other end of the first capacitor C1 is grounded;

the second current sampling point is connected with a second resistor R2, the other end of the second resistor R2 is connected with a second capacitor C2 and is connected with a second current sampling output point A2, and the other end of the second capacitor C2 is grounded;

the first current sampling output point A1 and the second current sampling output point A2 are both connected with the analog-to-digital conversion module (2).

10. The safety electric energy meter according to claim 9, wherein the voltage sampling module (5) comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third capacitor C3 and a fourth capacitor C4;

a first voltage sampling point is arranged between a first terminal of the electric load (7) and the switch (11), and a second voltage sampling point is arranged between a second terminal of the electric load (7) and the alternating-current voltage source (10);

the first voltage sampling point is connected with a third resistor R3, the other end of the third resistor R3 is connected with a fourth resistor R4 and a third capacitor C3 and is connected with a first voltage sampling output point B1, and the other end of the fourth resistor R4 is connected with the other end of the third capacitor C3 and is grounded;

the second voltage sampling point is connected with a fifth resistor R5, the other end of the fifth resistor R5 is connected with a sixth resistor R6 and a fourth capacitor C4 and is connected with a second voltage sampling output point B2, and the other end of the sixth resistor R6 is connected with the other end of the fourth capacitor C4 and is grounded;

the first voltage sampling output point B1 and the second voltage sampling output point B2 are both connected with the analog-to-digital conversion module (2).

Technical Field

The invention belongs to the technical field of electric energy meters, and particularly relates to a safe electric energy meter.

Background

An electric energy meter is a meter for measuring electric energy, and is also called as a watt-hour meter and a kilowatt-hour meter.

The existing power supply system measures the electric energy used by a user through an electric energy meter, calculates the electric charge according to the measured electric energy, and has important functions on standardizing the electricity consumption behavior of residential users and guiding the users to save the electricity. The conventional electric energy meter is used in a rated current range, generally, a metering result is accurate, but part of users have large loads, and actual current is far greater than rated current, so that metering deviation is caused, the calculation of electric charge is inaccurate, and potential safety hazards are brought at the same time.

This is a disadvantage of the prior art, and therefore, it is very necessary to provide a safe electric energy meter for the above mentioned disadvantages of the prior art.

Disclosure of Invention

Aiming at the defect that the conventional electric energy meter in the prior art cannot count and standardize the overload situation of the user, the invention provides a safe electric energy meter to solve the technical problem.

The invention provides a safe electric energy meter which comprises a main control module, wherein the main control module is connected with an analog-to-digital conversion module, a power supply module and a display module;

the power supply module is also connected with the analog-to-digital conversion module;

the analog-to-digital conversion module is connected with a voltage sampling module and a current sampling module;

the voltage sampling module samples the voltage value of the electric load, the current sampling module samples the current value of the electric load, the analog-to-digital conversion module converts the voltage value and the current value of the electric load into digital quantity and provides the digital quantity to the main control module, the main control module counts the electric energy value according to the voltage value and the current value of the electric load, judges whether the current value of the electric load exceeds the rated current, records the current value of the overload when the current value exceeds the rated current, counts the duration time of the overload current, and provides the electric energy value, the overload current value and the duration time of the overload current to the display module.

Furthermore, the main control module comprises an electric energy value statistical unit and an overload current statistical unit;

the electric energy value counting unit is used for acquiring the voltage value of the electric load through the voltage sampling module, acquiring the current value of the electric load through the current sampling module, counting the current value duration time of the electric load, setting the current value duration time as the electric time, calculating the electric energy value according to the voltage value, the current value and the electric time of the electric load, and providing the electric energy value to the display module;

and the overload current counting unit is used for comparing the current value of the electric load obtained by the current sampling module with the current threshold value to count the current value of the overload, setting the current value as the overload current, and counting the duration time of the overload current and the maximum value of the overload current to be provided for the display module.

Furthermore, the electric energy value statistical unit calculates a voltage effective value according to the voltage value and the electricity consumption time of the sampled electricity load, calculates a current effective value according to the current value and the electricity consumption time of the sampled electricity load, and calculates an electric energy value according to the voltage effective value, the current effective value and the electricity consumption time.

Further, the display module comprises an electric energy value display area and an overload current display area;

the electric energy value display area is used for displaying the electric energy value of the electric load in real time;

and the overload current display area is used for displaying the maximum value of the overload current and the overload current duration.

Furthermore, the master control module is also connected with a communication module, and the communication module is connected with a remote electric energy acquisition terminal.

Further, the communication module adopts an RS485 communication module or a wireless communication module.

Furthermore, the power supply module comprises a power supply conversion chip, the power supply conversion chip is connected with a battery unit and a filtering power supply, the filtering unit is connected with a rectifying unit, the rectifying unit is connected with a voltage reduction and transformation unit, and the voltage reduction and transformation unit is connected with an alternating-current voltage source;

the power conversion chip is also connected with the main control module and the analog-to-digital conversion module.

Further, the alternating current voltage source is connected with the electric load through the switch.

Further, the current sampling module comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2;

the electric load comprises a first terminal, a second terminal and a third terminal;

a first terminal of the electric load is connected with one end of the alternating current voltage source through a switch, a second terminal of the electric load is connected with the other end of the alternating current voltage source, and a third terminal of the electric load is grounded;

a first current sampling point and a second current sampling point are arranged between a first terminal of the electric load and the switch, the first current sampling point is connected with a first resistor R1, the other end of the first resistor R1 is connected with a first capacitor C1 and is connected with a first current sampling output point A1, and the other end of the first capacitor C1 is grounded;

the second current sampling point is connected with a second resistor R2, the other end of the second resistor R2 is connected with a second capacitor C2 and is connected with a second current sampling output point A2, and the other end of the second capacitor C2 is grounded;

the first current sampling output point A1 and the second current sampling output point A2 are both connected with the analog-to-digital conversion module.

Further, the voltage sampling module includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third capacitor C3, and a fourth capacitor C4;

a first voltage sampling point is arranged between the first terminal of the electric load and the switch, and a second voltage sampling point is arranged between the second terminal of the electric load and the alternating-current voltage source;

the first voltage sampling point is connected with a third resistor R3, the other end of the third resistor R3 is connected with a fourth resistor R4 and a third capacitor C3 and is connected with a first voltage sampling output point B1, and the other end of the fourth resistor R4 is connected with the other end of the third capacitor C3 and is grounded;

the second voltage sampling point is connected with a fifth resistor R5, the other end of the fifth resistor R5 is connected with a sixth resistor R6 and a fourth capacitor C4 and is connected with a second voltage sampling output point B2, and the other end of the sixth resistor R6 is connected with the other end of the fourth capacitor C4 and is grounded;

the first voltage sampling output point B1 and the second voltage sampling output point B2 are both connected with the analog-to-digital conversion module.

The beneficial effect of the invention is that,

the safe electric energy meter provided by the invention realizes electric energy statistics, simultaneously counts overload current, outputs the maximum value of the overload current and the duration time of the overload current through the display module, can effectively consider electric energy deviation caused by current overload during electric energy statistics, and avoids potential safety hazards.

In addition, the invention has reliable design principle, simple structure and very wide application prospect.

Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic diagram I of the internal structure of the safety electric energy meter of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the safety electric energy meter of the present invention;

FIG. 3 is a schematic diagram of a sampling circuit of the safety electric energy meter according to the present invention;

in the figure, 1-a master control module; 1.1-an electric energy value statistical unit; 1.2-an overload current statistical unit; 2, an analog-to-digital conversion module; 3-a power supply module; 3.1-power conversion chip; 3.2-battery cell; 3.3-a filtering unit; 3.4-a rectifying unit; 3.5-a step-down voltage transformation unit; 4-a display module; 4.1-electric energy value display area; 4.2-overload current display area; 5-a voltage sampling module; 6-a current sampling module; 7-electrical load; 8-a communication module; 9-remote electric energy acquisition terminal; 10-an alternating voltage source; 11-a switch; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; c1 — first capacitance; c2 — second capacitance; c3 — third capacitance; c4-fourth capacitance; a1 — first current sample output point; a2 — second current sample output point; b1 — first voltage sample output point; b2-second voltage sample output point.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

as shown in fig. 1, the present invention provides a safe electric energy meter, which includes a main control module 1, wherein the main control module 1 is connected with an analog-to-digital conversion module 2, a power supply module 3 and a display module 4;

the power supply module 3 is also connected with the analog-to-digital conversion module 2;

the analog-to-digital conversion module 2 is connected with a voltage sampling module 5 and a current sampling module 6;

the voltage sampling module 5 samples the voltage value of the electric load 7, the current sampling module 6 samples the current value of the electric load 7, the analog-digital conversion module 2 converts the voltage value and the current value of the electric load 7 into digital values and provides the digital values to the main control module 1, the main control module 1 counts the electric energy value according to the voltage value and the current value of the electric load 7, judges whether the current value of the electric load 7 exceeds the rated current, records the overload current value when the current value exceeds the rated current, counts the overload current duration, and provides the electric energy value, the overload current value and the overload current duration to the display module 4.

Example 2:

as shown in fig. 2, the present invention provides a safe electric energy meter, which includes a main control module 1, wherein the main control module 1 is connected with an analog-to-digital conversion module 2, a power module 3, a display module 4 and a communication module 8;

the power supply module 3 is also connected with the analog-to-digital conversion module 2;

the analog-to-digital conversion module 2 is connected with a voltage sampling module 5 and a current sampling module 6;

the communication module 8 is connected with a remote electric energy acquisition terminal 9; the communication module 8 can adopt an RS485 communication module or a wireless communication module;

the voltage sampling module 5 samples the voltage value of the electric load 7, the current sampling module 6 samples the current value of the electric load 7, the analog-digital conversion module 2 converts the voltage value and the current value of the electric load 7 into digital quantity and provides the digital quantity to the main control module 1, the main control module 1 counts the electric energy value according to the voltage value and the current value of the electric load 7, judges whether the current value of the electric load 7 exceeds the rated current, records the overload current value when the current value exceeds the rated current, counts the overload current duration, and provides the electric energy value, the overload current value and the overload current duration to the display module 4;

the main control module 1 comprises an electric energy value statistical unit 1.1 and an overload current statistical unit 1.2;

the electric energy value counting unit 1.1 is used for acquiring a voltage value of the electric load 7 through the voltage sampling module 5, acquiring a current value of the electric load 7 through the current sampling module 6, counting the current value duration time of the electric load 7, setting the current value duration time as electric time, calculating an electric energy value according to the voltage value, the current value and the electric time of the electric load 7, and providing the electric energy value for the display module 4; the electric energy value statistical unit 1.1 calculates a voltage effective value according to the voltage value and the electricity utilization time of the sampled electricity utilization load 7, calculates a current effective value according to the current value and the electricity utilization time of the sampled electricity utilization load 7, and calculates an electric energy value according to the voltage effective value, the current effective value and the electricity utilization time;

the overload current counting unit 1.2 is used for comparing the current value of the overload current with the current threshold value according to the current value of the electric load 7 acquired by the current sampling module 6, setting the current value as the overload current, counting the duration time of the overload current and the maximum value of the overload current, and providing the current value to the display module 4;

the power module 3 comprises a power conversion chip 3.1, the power conversion chip 3.1 is connected with a battery unit 3.2 and a filtering power supply 3.3, the filtering unit 3.3 is connected with a rectifying unit 3.4, the rectifying unit 3.4 is connected with a voltage reduction and transformation unit 3.5, and the voltage reduction and transformation unit 3.5 is connected with an alternating current voltage source 10;

the power conversion chip 3.1 is also connected with the main control module 1 and the analog-to-digital conversion module 2;

the display module 4 comprises an electric energy value display area 4.1 and an overload current display area 4.2;

the electric energy value display area 4.1 is used for displaying the electric energy value of the electric load 7 in real time;

and an overload current display area 4.2 for displaying the maximum value of the overload current and the overload current duration.

In embodiment 2 described above, as shown in fig. 3, the ac voltage source 10 is connected to the electric load 7 through the switch 11;

the current sampling module 6 comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2;

the electric load 7 includes a first terminal, a second terminal, and a third terminal;

a first terminal of the electric load 7 is connected with one end of an alternating current voltage source 10 through a switch 11, a second terminal of the electric load 7 is connected with the other end of the alternating current voltage source 10, and a third terminal of the electric load 7 is grounded;

a first current sampling point and a second current sampling point are arranged between a first terminal of the electric load 7 and the switch 11, the first current sampling point is connected with a first resistor R1, the other end of the first resistor R1 is connected with a first capacitor C1 and is connected with a first current sampling output point A1, and the other end of the first capacitor C1 is grounded;

the second current sampling point is connected with a second resistor R2, the other end of the second resistor R2 is connected with a second capacitor C2 and is connected with a second current sampling output point A2, and the other end of the second capacitor C2 is grounded;

the first current sampling output point A1 and the second current sampling output point A2 are both connected with the analog-to-digital conversion module 2;

the voltage sampling module 5 comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third capacitor C3 and a fourth capacitor C4;

a first voltage sampling point is arranged between a first terminal of the electric load 7 and the switch 11, and a second voltage sampling point is arranged between a second terminal of the electric load 7 and the alternating current voltage source 10;

the first voltage sampling point is connected with a third resistor R3, the other end of the third resistor R3 is connected with a fourth resistor R4 and a third capacitor C3 and is connected with a first voltage sampling output point B1, and the other end of the fourth resistor R4 is connected with the other end of the third capacitor C3 and is grounded;

the second voltage sampling point is connected with a fifth resistor R5, the other end of the fifth resistor R5 is connected with a sixth resistor R6 and a fourth capacitor C4 and is connected with a second voltage sampling output point B2, and the other end of the sixth resistor R6 is connected with the other end of the fourth capacitor C4 and is grounded;

the first voltage sampling output point B1 and the second voltage sampling output point B2 are both connected to the analog-to-digital conversion module 2.

Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.