CN217212861U - Electric energy meter - Google Patents
Electric energy meter Download PDFInfo
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- CN217212861U CN217212861U CN202220698314.3U CN202220698314U CN217212861U CN 217212861 U CN217212861 U CN 217212861U CN 202220698314 U CN202220698314 U CN 202220698314U CN 217212861 U CN217212861 U CN 217212861U
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Abstract
The utility model discloses an electric energy meter relates to the electronic circuit field, carries out the partial pressure with original voltage signal through simple bleeder circuit, and the low pressure threshold value that receives the singlechip with the voltage signal after the partial pressure detects the pin, as the last lower electricity detected signal of electric energy meter, because different singlechip pins withstand voltage limit value is different, can not accomplish circuit standardized design, the utility model provides an electric energy meter, include: when the electric energy meter is powered on, the input voltage of the VHH input end is high, the detection port of the control unit is pulled up to the power supply through the fourth resistor, and the detection port of the control unit is at a high level; when the electric energy meter is powered off, the input voltage of the VHH input end is low, the detection port of the control unit is grounded through the second triode, at the moment, the detection port of the control unit is at a low level, the control unit can judge the power-on and power-off states of the electric energy meter by detecting the level of the detection port, and the circuit structure can be compatible with single-chip microcomputers with different withstand voltage values.
Description
Technical Field
The utility model relates to an electronic circuit field especially relates to an electric energy meter.
Background
The existing method for judging power on and power off of an electric energy meter is basically that a direct current level is used, a power supply part of the electric energy meter converts commercial power or three-phase alternating current into direct current Voltage (VHH) through a transformer or a switching power supply, the VHH is converted into VCC through a Low Dropout Regulator (LDO) or a DC-DC converter, the VHH is divided through two resistors, and the divided voltage level is connected to a Low-voltage threshold detection pin of a single chip microcomputer to serve as a power on and power off detection signal of the electric energy meter.
Because the voltage-withstanding limits of the pins of different singlechips are different, the circuit standardized design cannot be realized.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide an electric energy meter which is compatible with different withstand voltage values and can judge power on and off.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a judge electric energy meter of going up the lower electricity.
In order to solve the above technical problem, the utility model provides an electric energy meter, including ammeter and the control unit, still include: a power-up and power-down detection circuit;
the power-on/power-off detection circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first triode and a second triode;
the first end and the VHH output port of first resistance are connected, the second end of first resistance with the first end of second resistance with the base of first triode is connected, the second end ground connection of second resistance, the collecting electrode of first triode with the first end of third resistance with the base of second triode is connected, the second end and the power of third resistance are connected, the projecting pole ground connection of first triode, the projecting pole ground connection of second triode, the collecting electrode of second triode with the first end of fourth resistance with the detection port of control unit is connected, fourth resistance second end with the power is connected.
Preferably, the electric energy meter, the up-down electricity detection circuit further includes: a fifth resistor;
the first end of the fifth resistor is connected with the second end of the first resistor, and the second end of the fifth resistor is connected with the base electrode of the first triode.
Preferably, the electric energy meter, the up-down electricity detection circuit further includes: a first capacitor;
and the first end of the first capacitor is connected with the first end of the fifth resistor, and the second end of the first capacitor is grounded.
Preferably, the electric energy meter, the up-down electricity detection circuit further includes: a filter circuit (21);
one end of the filter circuit (21) is connected with the collector electrode of the second triode, and the other end of the filter circuit (21) is connected with the detection port of the control unit.
Preferably, in the electric energy meter, the filter circuit (21) includes: a sixth resistor and a second capacitor;
the first end of the sixth resistor is connected with the collector of the second triode, the second end of the sixth resistor is connected with the first end of the second capacitor and the detection port of the control unit, and the second end of the second capacitor is grounded.
Preferably, the electric energy meter further includes: a metering unit;
the metering unit is connected with the alternating current output port and the control unit.
Preferably, the control unit of the electric energy meter is an MCU.
Preferably, the electric energy meter further comprises: a display unit; the display unit is connected with the control unit.
Preferably, the electric energy meter further includes: a storage unit; the storage unit is connected with the control unit.
Preferably, the electric energy meter further comprises: and the communication unit is connected with the control unit.
The utility model provides an electric energy meter, include: a power-up and power-down detection circuit; the power-on/power-off detection circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first triode and a second triode; the first end of the first resistor is connected with the VHH output port, the second end of the first resistor is connected with the first end of the second resistor and the base electrode of the first triode, the second end of the second resistor is grounded, the collector electrode of the first triode is connected with the first end of the third resistor and the base electrode of the second triode, the second end of the third resistor is connected with the power supply, the emitter electrode of the first triode is grounded, the emitter electrode of the second triode is grounded, the collector electrode of the second triode is connected with the first end of the fourth resistor and the detection port of the control unit, the second end of the fourth resistor is connected with the power supply, when the electric energy meter is powered on, when the input voltage of the VHH input end is high, after the voltage is divided through the first resistor and the second resistor, the first triode is conducted, at the moment, the collector voltage of the first triode is 0V, the second triode is cut off, the detection port of the control unit is pulled up to the power supply through the fourth resistor, at the moment, the detection port of the control unit is at a high level; when the electric energy meter is powered off, the input voltage of the VHH input end is low, the first triode is cut off, the collector voltage of the first triode is pulled up to the power supply through the third resistor, the second triode is conducted, the detection port of the control unit is grounded through the second triode, and at the moment, the detection port of the control unit is at a low level; the control unit can judge the power-on and power-off of the electric energy meter by detecting the level of the detection port.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without inventive work.
Fig. 1 is a schematic diagram of a power-up and power-down detection circuit provided in an embodiment of the present application.
Wherein the reference numbers are as follows: and 21 is a filter circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, the ordinary skilled in the art can obtain all other embodiments without creative work, which all belong to the protection scope of the present invention.
The core of the utility model is to provide an electric energy meter for detecting power-on and power-off.
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.
The application provides an electric energy meter, including ammeter and the control unit, its characterized in that still includes: a power-up and power-down detection circuit; fig. 1 is a schematic diagram of a power-up and power-down detection circuit provided in an embodiment of the present application, and as shown in fig. 1, the power-up and power-down detection circuit includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first triode Q1 and a second triode Q2;
the first end of the first resistor R1 is connected with the VHH output port, the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the base of the first triode Q1, the second end of the second resistor R2 is grounded, the collector of the first triode Q1 is connected with the first end of the third resistor R3 and the base of the second triode Q2, the second end of the third resistor R3 is connected with the power supply, the emitter of the first triode Q1 is grounded, the emitter of the second triode Q2 is grounded, the collector of the second triode Q2 is connected with the first end of the fourth resistor R4 and the detection port LVDIN of the control unit, and the second end of the fourth resistor R4 is connected with the power supply VCC.
It should be noted that, the control Unit mentioned in this embodiment refers to a main Processing chip of the electric energy meter, and can control the electric energy meter to perform the functions of sampling and measuring current and voltage, storing data, controlling a switch, and the like, and the embodiments are not limited to specific types of the control Unit, such as a Micro Controller Unit (MCU), a Central Processing Unit (CPU), and the like. As shown in fig. 1, the LVDIN port is a detection port of the control unit for detecting the level. Preferably, the control unit is an MCU, which appropriately reduces the frequency and specification of the cpu, and integrates peripheral interfaces such as a memory (memory), a counter (Timer), a Universal Serial Bus (USB) and the like on a single chip to form a chip-level computer, so as to perform different combination control for different applications.
The VHH output port mentioned in this embodiment refers to an output port at which the electric energy meter converts commercial power or three-phase alternating current into a direct current signal, and the direct current voltage signal is more convenient for measurement and calculation. Usually, the VHH is converted to VCC by a low dropout regulator or a DC-DC converter, and the voltage VCC provides a power supply for a control unit of the electric energy meter.
The first resistor R1 and the second resistor R2 form a voltage divider circuit, which converts a high Voltage (VHH) signal into a lower voltage signal for detection by voltage division. The specific resistance values of the first resistor R1 and the second resistor R2 are not limited in this embodiment, and may be designed according to actual needs.
The first triode Q1 and the second triode Q2 are NPN triodes, the third resistor R3 serves as a pull-up resistor for the collector of the first triode Q1, and when the first triode Q1 is turned off, the collector of the first triode Q1 is pulled up to VCC by the third resistor R3. The third resistor R3 also serves as a base current limiting resistor for the second transistor Q2, preventing the second transistor Q2 from accidentally turning on. The fourth resistor R4 acts as a pull-up resistor for the collector of the second transistor Q2, which pulls the collector voltage of the second transistor Q2 up to VCC through the fourth resistor R4 when the second transistor Q2 is turned off. The first transistor Q1 and the second transistor Q2 in the embodiment of the present application are NPN transistors.
Specifically, when the electric energy meter is powered on, when the input voltage of the VHH input end is high, and is divided by the first resistor R1 and the second resistor R2, the first triode Q1 is turned on, at this time, the collector voltage of the first triode Q1 is 0V, the second triode Q2 is turned off, the detection port LVDIN of the control unit is pulled up to the power supply VCC through the fourth resistor R4, and at this time, the detection port LVDIN of the control unit is at a high level; when the electric energy meter is powered off, the input voltage of the VHH input end is low, the first triode Q1 is cut off, the collector voltage of the first triode Q1 is pulled up to a power supply VCC through the third resistor R3, the second triode Q2 is conducted, the detection port LVDIN of the control unit is grounded through the second triode Q2, and at the moment, the detection port of the control unit is at a low level; therefore, according to the electric energy meter provided by the embodiment, the control unit can judge the power-on and power-off of the electric energy meter by detecting the level of the detection port LVDIN, and the circuit structure can be compatible with single-chip microcomputers with different voltage withstanding values.
According to the above embodiments, this embodiment provides a preferable solution, as shown in fig. 1, the power-up and power-down detection circuit further includes: a fifth resistor R5; a first capacitance C1;
the first end of the fifth resistor R5 is connected to the second end of the first resistor R1, and the second end of the fifth resistor R5 is connected to the base of the first transistor Q1.
The first end of the first capacitor C1 is connected to the first end of the fifth resistor R5, and the second end of the first capacitor C1 is grounded.
The fifth resistor R5 is used as a current-limiting resistor of the first triode Q1, so that the first triode Q1 is prevented from being burnt out due to overlarge base current and the current-limiting function is realized; the first capacitor C1 is used as a filter capacitor to improve the anti-interference capability.
According to the above embodiment, this embodiment provides a preferable solution, and the power-up/down detection circuit further includes: a filter circuit 21;
one end of the filter circuit 21 is connected to the collector of the second transistor Q2, and the other end of the filter circuit 21 is connected to the detection port LVDIN of the control unit.
The filter circuit 21 mentioned in this embodiment is disposed between the collector of the second transistor Q2 and the detection port LVDIN of the control unit, and is used for filtering the interference signal in the signal output by the second transistor Q2. The specific structure of the filter circuit 21, such as the RC filter circuit 21, the LC filter circuit 21, and the electronic filter circuit, is not limited in this embodiment, and may be designed according to actual needs.
Preferably, as shown in fig. 1, the filter circuit 21 includes: a sixth resistor R6 and a second capacitor C2;
a first end of the sixth resistor R6 is connected to the collector of the second transistor Q2, a second end of the sixth resistor R6 is connected to the first end of the second capacitor C2 and the detection port of the control unit, and a second end of the second capacitor C2 is grounded.
The sixth resistor R6 and the second capacitor C2 form an L-shaped RC filter circuit 21, so that interference signals in signals output by the second triode Q2 are filtered, and the anti-interference capability is improved.
According to the above embodiment, since frequent power-on and power-off of the electric energy meter may occur when the alternating current is reduced to a certain voltage interval below 60%, this embodiment provides a preferable scheme, and the electric energy meter further includes: a metering unit;
the metering unit is connected with the alternating current output port and the control unit.
The metering unit mentioned in this embodiment is used for acquiring a voltage value and a current value of an alternating voltage of a current electric energy meter in real time, and the control unit acquires the voltage value and the current value through the metering unit.
The present embodiment provides a preferable scheme that when the detection port LVDIN of the control unit detects a high level, the control unit periodically reads the voltage value of the metering unit, when the voltage value is greater than 60% of the preset nominal voltage value, the control unit is normally powered on, when the detection port LVDIN of the control unit detects a low level or when the voltage value of the metering unit is less than or equal to 60% of the preset nominal voltage value, the control unit is powered off. When the alternating voltage is reduced to the critical voltage range of the work of the electric energy meter, the electric energy meter is prevented from being frequently powered off, and the electric energy meter is prevented from being damaged or the data of the electric energy meter is prevented from being lost. In addition, it should be noted that, the 60% mentioned in this embodiment is only a specific scheme, and other values, such as 50%, 40%, etc., may also be selected, and this embodiment is not particularly limited.
According to the above embodiment, the electric energy meter further includes: a display unit; the display unit is connected with the control unit.
The Display unit mentioned in this embodiment is used for displaying specific information under the control of the control unit, and the Display unit may be a digital tube, or may be a Liquid Crystal Display (LCD), and the like, which is not limited in this embodiment.
According to the above embodiment, the electric energy meter further includes: a storage unit; the storage unit is connected with the control unit.
The storage unit mentioned in this embodiment is used for storing the data of the electric energy meter, and preferably, when the detection port LVDIN of the control unit detects a low level or reads that the ac voltage value detected by the metering unit is less than or equal to 60% of the preset nominal voltage value, the control unit stores the current data information in the storage unit first, and then powers off the control unit, so as to prevent data loss.
According to the above embodiment, the electric energy meter further includes: further comprising: and the communication unit is connected with the control unit.
The communication unit mentioned in this embodiment is used to enable the power supplier to automatically and remotely read the meter using different communication solutions, such as radio frequency wireless, power line carrier and General Packet Radio System (GPRS) data communication. The communication unit may also communicate directly with other electricity meters and internal display units to better manage energy consumption.
It is right above the utility model provides an electric energy meter has carried out detailed introduction. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the scope of the appended claims.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An electric energy meter, includes ammeter and the control unit, its characterized in that still includes: a power-up and power-down detection circuit;
the power-on/power-off detection circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first triode and a second triode;
the first end and the VHH output port of first resistance are connected, the second end of first resistance with the first end of second resistance with the base of first triode is connected, the second end ground connection of second resistance, the collecting electrode of first triode with the first end of third resistance with the base of second triode is connected, the second end and the power of third resistance are connected, the projecting pole ground connection of first triode, the projecting pole ground connection of second triode, the collecting electrode of second triode with the first end of fourth resistance with the detection port of control unit is connected, fourth resistance second end with the power is connected.
2. The electric energy meter according to claim 1, wherein the power-up and power-down detection circuit further comprises: a fifth resistor;
the first end of the fifth resistor is connected with the second end of the first resistor, and the second end of the fifth resistor is connected with the base electrode of the first triode.
3. The electric energy meter according to claim 2, wherein the power-up and power-down detection circuit further comprises: a first capacitor;
and the first end of the first capacitor is connected with the first end of the fifth resistor, and the second end of the first capacitor is grounded.
4. The electric energy meter according to claim 3, wherein the power-up and power-down detection circuit further comprises: a filter circuit (21);
one end of the filter circuit (21) is connected with the collector electrode of the second triode, and the other end of the filter circuit (21) is connected with the detection port of the control unit.
5. Electric energy meter according to claim 4, characterized in that the filter circuit (21) comprises: a sixth resistor and a second capacitor;
the first end of the sixth resistor is connected with the collector of the second triode, the second end of the sixth resistor is connected with the first end of the second capacitor and the detection port of the control unit, and the second end of the second capacitor is grounded.
6. The electrical energy meter of claim 1, further comprising: a metering unit;
the metering unit is connected with the alternating current output port and the control unit.
7. The electric energy meter according to claim 1, wherein the control unit is an MCU.
8. The electrical energy meter of claim 1, further comprising: a display unit; the display unit is connected with the control unit.
9. The electrical energy meter of claim 1, further comprising: a storage unit; the storage unit is connected with the control unit.
10. The electric energy meter according to any one of claims 1 to 9, further comprising: and the communication unit is connected with the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220698314.3U CN217212861U (en) | 2022-03-28 | 2022-03-28 | Electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220698314.3U CN217212861U (en) | 2022-03-28 | 2022-03-28 | Electric energy meter |
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| Publication Number | Publication Date |
|---|---|
| CN217212861U true CN217212861U (en) | 2022-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220698314.3U Active CN217212861U (en) | 2022-03-28 | 2022-03-28 | Electric energy meter |
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| CN (1) | CN217212861U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760475A (en) * | 2023-08-18 | 2023-09-15 | 青岛鼎信通讯股份有限公司 | Infrared signal communication circuit and method of intelligent electric energy meter |
-
2022
- 2022-03-28 CN CN202220698314.3U patent/CN217212861U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760475A (en) * | 2023-08-18 | 2023-09-15 | 青岛鼎信通讯股份有限公司 | Infrared signal communication circuit and method of intelligent electric energy meter |
| CN116760475B (en) * | 2023-08-18 | 2023-12-08 | 青岛鼎信通讯股份有限公司 | Infrared signal communication circuit and method of intelligent electric energy meter |
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