CN209961865U - Electric energy quality monitoring circuit and electric energy monitoring equipment - Google Patents
Electric energy quality monitoring circuit and electric energy monitoring equipment Download PDFInfo
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- CN209961865U CN209961865U CN201920613509.1U CN201920613509U CN209961865U CN 209961865 U CN209961865 U CN 209961865U CN 201920613509 U CN201920613509 U CN 201920613509U CN 209961865 U CN209961865 U CN 209961865U
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Abstract
The utility model discloses an electric energy quality monitoring circuit and electric energy monitoring equipment, the electric energy quality monitoring circuit includes analog-to-digital conversion circuit and singlechip processing circuit; the analog-to-digital conversion circuit is connected with the singlechip processing circuit; the analog-to-digital conversion circuit is used for acquiring a voltage analog signal of a power grid to be detected, converting the voltage analog signal into a current analog signal, performing analog-to-digital conversion on the current analog signal and outputting a current digital signal; and the singlechip processing circuit is used for processing the current digital signal and outputting a current value. The utility model discloses in will set up analog-to-digital conversion circuit and singlechip processing circuit and come the monitoring to wait to detect the power quality of electric wire netting, particularly, will be the electric current analog signal to the voltage analog signal conversion of direct access, carry out analog-to-digital conversion to the electric current analog signal again to make finally can obtain the current value, it is more efficient and more accurate in the aspect of the electric energy monitoring, solved the technical problem that can't accurately monitor power quality.
Description
Technical Field
The utility model relates to an integrated circuit technical field, in particular to electric energy quality monitoring circuit and electric energy monitoring facilities.
Background
In view of the fact that the quality of electric energy affects the safe and economic operation of each enterprise, with the development of power grid technology, a new trend of development of modern power grid and load composition also appears, and the quality of electric energy is further deteriorated by the access of a large amount of distributed energy (for example, wind power generation, solar power generation and the like).
In particular, conditions such as impact load and nonlinear load cause serious power quality problems such as waveform distortion, voltage flicker and voltage sag in the power grid.
On the other hand, the sophisticated and complex electronic devices used also require a high quality and high reliability of the power supply.
Therefore, continuous monitoring and analytical evaluation of the quality of the electrical energy becomes of particular importance.
However, the conventional mechanical power measuring instrument cannot accurately monitor the power quality in the current power grid environment, so the conventional mechanical power measuring instrument has gradually exited the power monitoring industry.
It is thus clear that monitoring of power quality cannot be accurately performed at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electric energy quality monitoring circuit aims at solving the technical problem that can't accurately monitor electric energy quality.
In order to achieve the above object, the utility model provides an electric energy quality monitoring circuit, which comprises an analog-to-digital conversion circuit and a single chip processing circuit; the analog-to-digital conversion circuit is connected with the single chip microcomputer processing circuit; wherein the content of the first and second substances,
the analog-to-digital conversion circuit is used for acquiring a voltage analog signal of a power grid to be detected, converting the voltage analog signal into a current analog signal, performing analog-to-digital conversion on the current analog signal and outputting a current digital signal;
and the singlechip processing circuit is used for processing the current digital signal and outputting a current value.
Preferably, the analog-to-digital conversion circuit comprises an analog-to-digital conversion chip and a first resistor;
the first input pin of the analog-to-digital conversion chip is respectively connected with a power grid to be detected and the first end of the first resistor, the second end of the first resistor is connected with the second input pin of the analog-to-digital conversion chip, and the output pin of the analog-to-digital conversion chip is connected with the single chip microcomputer processing circuit.
Preferably, the output pin of the analog-to-digital conversion chip is further used for outputting a voltage digital signal;
the singlechip processing circuit is also used for processing the voltage digital signal and outputting a voltage value.
Preferably, the single chip microcomputer processing circuit comprises a signal processing chip; the analog-to-digital conversion chip is connected with the signal processing chip; wherein the content of the first and second substances,
the first input pin of the signal processing chip is used for acquiring the current digital signal;
and the output pin of the signal processing chip is used for outputting the current value.
Preferably, the single chip microcomputer processing circuit further comprises a first capacitor, a second capacitor and a crystal oscillator;
the oscillation input end of the signal processing chip is respectively connected with the first end of the first capacitor and the first end of the crystal oscillator, and the second end of the crystal oscillator is respectively connected with the first end of the second capacitor and the oscillation output end of the signal processing chip;
and the second end of the first capacitor is connected with the second end of the second capacitor, and the second end of the second capacitor is grounded.
Preferably, the power quality monitoring circuit further comprises a key circuit; the key circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first key, a second key, a third key, a fourth key and a first internal power supply; wherein the content of the first and second substances,
a first key pin of the signal processing chip is connected with a first end of the second resistor, a second key pin of the signal processing chip is connected with a first end of the third resistor, a third key pin of the signal processing chip is connected with a first end of the fourth resistor, and a fourth key pin of the signal processing chip is connected with a first end of the fifth resistor;
a second end of the second resistor is connected with a second end of the third resistor, a second end of the fourth resistor, a second end of the fifth resistor and the first internal power supply respectively;
the first end of the second resistor is connected with the first end of the first key, and the second end of the first key is grounded;
the first end of the third resistor is connected with the first end of the second key, and the second end of the second key is grounded;
the first end of the fourth resistor is connected with the first end of the third key, and the second end of the third key is grounded;
and the first end of the fifth resistor is connected with the first end of the fourth key, and the second end of the fourth key is grounded.
Preferably, the power quality monitoring circuit further comprises a power supply unit, and the single chip microcomputer processing circuit is connected with the power supply unit; the power supply unit comprises an external power supply, a switch, a third capacitor and a fourth capacitor;
a first end of the external power supply is connected with a first end of the switch, a second end of the switch is respectively connected with a first end of the third capacitor and a first end of the fourth capacitor, and a first end of the fourth capacitor is connected with a power input pin of the signal processing chip;
and the second end of the external power supply is respectively connected with the second end of the third capacitor and the second end of the fourth capacitor, and the second end of the fourth capacitor is grounded.
Preferably, the electric energy quality monitoring circuit further comprises a buzzer alarm circuit, and the single chip microcomputer processing circuit is connected with the buzzer alarm circuit; the buzzing alarm circuit comprises a sixth resistor, a triode, a buzzer and a second internal power supply; wherein the content of the first and second substances,
the single chip microcomputer processing circuit is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the base electrode of the triode, the emitting electrode of the triode is connected with the second internal power supply source, the collecting electrode of the triode is connected with the first end of the buzzer, and the second end of the buzzer is grounded.
Preferably, the power quality monitoring circuit further comprises a Light Emitting Diode (LED) alarm circuit, and the single chip microcomputer processing circuit is connected with the LED alarm circuit; the LED alarm circuit comprises a seventh resistor, an LED and a third internal power supply; wherein the content of the first and second substances,
the single chip microcomputer processing circuit is connected with a first end of the seventh resistor, a second end of the seventh resistor is connected with a first end of the LED, and a second end of the LED is connected with the third internal power supply.
The utility model discloses still provide an electric energy monitoring facilities, electric energy monitoring facilities includes as above electric energy quality monitoring circuit.
The utility model discloses in will set up analog-to-digital conversion circuit and singlechip processing circuit and come the monitoring to wait to detect the power quality of electric wire netting, particularly, will be the electric current analog signal to the voltage analog signal conversion of direct access, carry out analog-to-digital conversion to the electric current analog signal again to make finally can obtain the current value, it is more efficient and more accurate in the aspect of the electric energy monitoring, solved the technical problem that can't accurately monitor power quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of an embodiment of the power quality monitoring circuit of the present invention;
fig. 2 is a schematic diagram of a circuit structure of an embodiment of the power quality monitoring circuit of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
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, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides an electric energy quality monitoring circuit, wherein, fig. 1 is the utility model discloses the functional module diagram of an electric energy quality monitoring circuit embodiment, fig. 2 is the utility model discloses the circuit structure schematic diagram of an electric energy quality monitoring circuit embodiment.
Please refer to fig. 1 to 2 in detail, which includes an analog-to-digital conversion circuit 100 and a single-chip processing circuit 200; the analog-to-digital conversion circuit 100 is connected with the singlechip processing circuit 200; wherein the content of the first and second substances,
the analog-to-digital conversion circuit 100 is configured to acquire a voltage analog signal of a to-be-detected power grid, convert the voltage analog signal into a current analog signal, perform analog-to-digital conversion on the current analog signal, and output a current digital signal;
the single chip processing circuit 200 is configured to process the current digital signal and output a current value.
It can be understood that there are various indexes for representing the power quality, for example, a current value is taken as an example, the analog-to-digital conversion circuit 100 may be connected to the power grid to be detected, the analog-to-digital conversion circuit 100 captures a voltage analog signal of the power grid to be detected and directly connects to the voltage analog signal, and then the current value of the power grid to be detected is obtained through the voltage analog signal, so as to complete the monitoring operation on the power quality.
Specifically, considering that the voltage analog signal exists in the form of an analog signal, the command type of the power quality indicator to be obtained currently is a current value rather than a voltage value, but the analog-to-digital conversion circuit 100 may not be directly connected to the current analog signal for recording the current value. Therefore, the voltage analog signal representing the voltage value can be directly accessed, and then the voltage analog signal is converted into the current analog signal representing the current value, so that the voltage can be converted into the current at the moment.
It should be understood that the analog-to-digital conversion circuit 100 may then perform analog-to-digital conversion on the current analog signal, i.e., convert the analog signal into a digital signal, and obtain a current digital signal corresponding to the current analog signal. This is to obtain a more accurate index value in consideration of the fact that the index value is converted into a digital signal and then subjected to correlation processing. After obtaining the current digital signal, the single chip processing circuit 200 may obtain the current value recorded in the current digital signal.
In this embodiment, the analog-to-digital conversion circuit 100 and the single chip processing circuit 200 are arranged to monitor the power quality of the power grid to be detected, specifically, the directly accessed voltage analog signal is converted into the current analog signal, and then the current analog signal is subjected to analog-to-digital conversion, so that the current value can be finally obtained, the power monitoring is more efficient and accurate, and the technical problem that the power quality cannot be accurately monitored is solved.
Further, the analog-to-digital conversion circuit 100 includes an analog-to-digital conversion chip U1 and a first resistor R1;
a first input pin IN1 of the analog-to-digital conversion chip U1 is connected with a power grid to be detected and a first end of the first resistor R1 respectively, a second end of the first resistor R1 is connected with a second input pin IN2 of the analog-to-digital conversion chip U1, and an output pin OUT1 of the analog-to-digital conversion chip U1 is connected with the single chip microcomputer processing circuit 200.
It is understood that the analog-to-digital conversion circuit 100 may not be directly connected to the current analog signal for recording the current value, and therefore, may be connected to the voltage analog signal for recording the voltage value. For example, if the analog-to-digital conversion circuit 100 includes an analog-to-digital (a/D) chip, the a/D chip may also be referred to as an a/D converter, and the a/D converter may not be able to access the current, for example, neither the first input pin IN1 nor the second input pin IN2 of the a/D converter may be directly connected to the current analog signal for recording the current value, but only the voltage analog signal for recording the voltage value, the first resistor R1 may be additionally introduced to monitor the current.
Specifically, the current to be monitored can be converted into a voltage by connecting a resistor in series, and the current-to-voltage conversion is realized by the resistor. The a/D converter is connected to the directly connectable voltage, for example, a voltage analog signal is directly connected to the first input pin IN1 of U1, another voltage analog signal is directly connected to the second input pin IN2 of U1, and the voltage can be converted into a current due to the fixed resistance of the first resistor R1, so that the voltage-to-current conversion is realized, and the current monitoring is completed.
It can be seen that the current monitoring is completed in the present embodiment on the premise that the a/D converter can only be directly connected to the voltage.
Further, the output pin OUT1 of the analog-to-digital conversion chip U1 is also used for outputting a voltage digital signal;
the single chip processing circuit 200 is further configured to process the voltage digital signal and output a voltage value.
It should be understood that, IN view of the fact that the voltage analog signal is directly connected to the first input pin IN1 of the a/D converter IN the embodiment, if the command type of the power quality indicator to be obtained is a voltage value, the voltage analog signal can be directly analog-to-digital converted to obtain a corresponding voltage digital signal, and finally obtain a voltage value represented by the voltage digital signal.
Further, the single chip microcomputer processing circuit 200 comprises a signal processing chip U2; the analog-to-digital conversion chip U1 is connected with the signal processing chip U2; wherein the content of the first and second substances,
a first input pin IN of the signal processing chip U2, configured to obtain the current digital signal;
and the output pin OUT of the signal processing chip U2 is used for outputting the current value.
It can be understood that the single chip processing circuit 200 will include a signal processing chip U2, the chip type of the signal processing chip U2 may be AT89C51, and the signal processing chip U2 of AT89C51 model is mainly composed of an 8-bit microcontroller. The output pin OUT1 of the analog-to-digital conversion chip U1 is connected to the first input pin IN of the signal processing chip U2, the output pin OUT1 of the analog-to-digital conversion chip U1 outputs a current digital signal to the first input pin IN of the signal processing chip U2, and the current digital signal is processed by the signal processing chip U2 to obtain an actual current value.
Further, the single chip processing circuit 200 further includes a first capacitor C1, a second capacitor C2, and a crystal oscillator Y;
an oscillation input end X1 of the signal processing chip U2 is respectively connected with a first end of the first capacitor C1 and a first end of the crystal oscillator Y, and a second end of the crystal oscillator Y is respectively connected with a first end of the second capacitor C2 and an oscillation output end X2 of the signal processing chip U2;
the second terminal of the first capacitor C1 is connected to the second terminal of the second capacitor C2, and the second terminal of the second capacitor C2 is grounded.
In a specific implementation, a crystal oscillator Y may be provided for the signal processing chip U2 to provide a clock signal, and specifically, when the crystal oscillator operates, a certain clock frequency is generated, so that the single chip processing circuit 200 can operate normally and orderly.
The resistance value of the first capacitor C1 is 22F, the resistance value of the second capacitor C2 is 22F, and the oscillation frequency of the crystal oscillator Y is 11.0592 MHz.
Further, the power quality monitoring circuit further comprises a key circuit 300; the KEY circuit 300 comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first KEY1, a second KEY2, a third KEY3, a fourth KEY4 and a first internal power supply VCC 1; wherein the content of the first and second substances,
a first key pin K1 of the signal processing chip U2 is connected with a first end of the second resistor R2, a second key pin K2 of the signal processing chip U2 is connected with a first end of the third resistor R3, a third key pin K3 of the signal processing chip U2 is connected with a first end of the fourth resistor R4, and a fourth key pin K4 of the signal processing chip U2 is connected with a first end of the fifth resistor R5;
a second end of the second resistor R2 is connected to a second end of the third resistor R3, a second end of the fourth resistor R4, a second end of the fifth resistor R5, and the first internal power supply VCC1, respectively;
a first end of the second resistor R2 is connected to a first end of the first KEY1, and a second end of the first KEY1 is grounded;
a first end of the third resistor R3 is connected to a first end of the second KEY2, and a second end of the second KEY2 is grounded;
a first end of the fourth resistor R4 is connected to a first end of the third KEY3, and a second end of the third KEY3 is grounded;
a first end of the fifth resistor R5 is connected to a first end of the fourth KEY4, and a second end of the fourth KEY4 is grounded.
It should be understood that a key circuit 300 consisting of four keys for a start button, a reset button, an add button, and a minimize button may be additionally introduced. The resistance values of the second resistor R2 to the fifth resistor R5 are 4.7K ohms.
The first KEY from top to bottom, i.e. the first KEY1, is a start button for starting measurement, i.e. after setting the measurement range, the measurement mode can be entered by pressing the first KEY 1; the second KEY2 is a reset button, when the switch S is pressed, it will automatically return to the original state at the beginning, if there is a display screen connected to the single chip processing circuit 200, the current value or voltage value on the display screen will return to 0; the third KEY3 and the fourth KEY4 are an increase button and a minimize button, respectively, which may increase and decrease the measurement range. The current value or the voltage value obtained by monitoring will fall within this measurement range.
Further, the power quality monitoring circuit further comprises a power supply unit 400, and the single chip microcomputer processing circuit 200 is connected with the power supply unit 400; the power supply unit 400 includes an external power supply, a switch S, a third capacitor C3, and a fourth capacitor C4;
a first end of the external power supply is connected with a first end of the switch S, a second end of the switch S is respectively connected with a first end of the third capacitor C3 and a first end of the fourth capacitor C4, and a first end of the fourth capacitor C4 is connected with a power input pin X3 of the signal processing chip U2;
a second terminal of the external power supply is connected to the second terminal of the third capacitor C3 and the second terminal of the fourth capacitor C4, respectively, and a second terminal of the fourth capacitor C4 is grounded.
In a specific implementation, the power supply unit 400 may be configured to provide stable and reliable power for the operation of the mcu 200, and the switch S may be configured to cut off the power supply from the external power supply to the mcu 200 at any time. The capacitance value of the third capacitor C3 is 104F; the capacitance of the fourth capacitor C4 is 47 μ F, the fourth capacitor C4 is a polar capacitor, the first terminal of the fourth capacitor C4 is positive, and the second terminal is negative.
In addition, a power indicator can be further arranged to remind whether the power supply is normal, specifically, the power input pin X3 of the signal processing chip U2 can be connected with the positive electrode of the power indicator, the negative electrode of the power indicator is connected with the first end of the power indicator, and the second end of the power indicator is grounded. Wherein, the resistance value of the power supply indicating resistor is 10K ohm.
Further, the electric energy quality monitoring circuit further comprises a buzzing alarm circuit 501, and the single chip microcomputer processing circuit 200 is connected with the buzzing alarm circuit 501; the buzzing alarm circuit 501 comprises a sixth resistor R6, a triode M, a buzzer L and a second internal power supply VCC 2; wherein the content of the first and second substances,
the buzzer alarm pin SPEAK of the single chip microcomputer processing circuit 200 is connected with the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected with the base electrode of the triode M, the emitting electrode of the triode M is connected with the second internal power supply VCC2, the collecting electrode of the triode M is connected with the first end of the buzzer L, and the second end of the buzzer L is grounded.
In specific implementation, a buzzing alarm mode can be added, for example, when the voltage value is greater than or equal to 5V, the buzzer L can make a sound to alarm, so that attention of workers is brought, operators are prompted to find problems in time, dangerous conditions are handled correctly, and circuit safety is guaranteed. The resistance value of the sixth resistor R6 is 100 ohms.
Further, the power quality monitoring circuit further comprises a Light Emitting Diode (LED) alarm circuit 502, and the single chip microcomputer processing circuit 200 is connected with the LED alarm circuit 502; the LED alarm circuit 502 comprises a seventh resistor R7, an LED and a third internal power supply VCC 3; wherein the content of the first and second substances,
the luminous alarm pin X4 of singlechip processing circuit 2 with the first end of seventh resistance R7 is connected, the second end of seventh resistance R7 with the first end of LED is connected, the second end of LED with third inside power supply VCC3 is connected.
In a specific implementation, a Light Emitting Diode (LED) alarm mode may be added, for example, when the voltage value is greater than or equal to 5V, the LED may flash to remind the operator. Wherein, the resistance value of the seventh resistor R7 is 1K ohm; moreover, the first end of the LED is a cathode, and the second end of the LED is an anode.
Further, the power quality monitoring circuit further comprises a liquid crystal display circuit, and the single chip microcomputer processing circuit 200 is connected with the liquid crystal display circuit.
It is understood that the Liquid Crystal Display circuit may include a Liquid Crystal Display (LCD), and the LCD may Display a current value or a voltage value.
In a specific implementation, the LCD1602 can be used as the LCD, which is simple and fast to operate and is convenient to use.
The utility model also provides an electric energy monitoring equipment, this electronic equipment include above-mentioned electric energy quality monitoring circuit, and this electric energy quality monitoring circuit's concrete structure refers to above-mentioned embodiment, because this electric energy monitoring equipment has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The electronic device may be a handheld power quality monitor.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A power quality monitoring circuit is characterized by comprising an analog-to-digital conversion circuit and a single chip microcomputer processing circuit; the analog-to-digital conversion circuit is connected with the single chip microcomputer processing circuit; wherein the content of the first and second substances,
the analog-to-digital conversion circuit is used for acquiring a voltage analog signal of a power grid to be detected, converting the voltage analog signal into a current analog signal, performing analog-to-digital conversion on the current analog signal and outputting a current digital signal;
and the singlechip processing circuit is used for processing the current digital signal and outputting a current value.
2. The power quality monitoring circuit of claim 1, wherein the analog-to-digital conversion circuit comprises an analog-to-digital conversion chip and a first resistor;
the first input pin of the analog-to-digital conversion chip is respectively connected with a power grid to be detected and the first end of the first resistor, the second end of the first resistor is connected with the second input pin of the analog-to-digital conversion chip, and the output pin of the analog-to-digital conversion chip is connected with the single chip microcomputer processing circuit.
3. The power quality monitoring circuit according to claim 2, wherein the output pin of the analog-to-digital conversion chip is further configured to output a voltage digital signal;
the singlechip processing circuit is also used for processing the voltage digital signal and outputting a voltage value.
4. The power quality monitoring circuit of claim 2, wherein the single-chip processing circuit comprises a signal processing chip; the analog-to-digital conversion chip is connected with the signal processing chip; wherein the content of the first and second substances,
the first input pin of the signal processing chip is used for acquiring the current digital signal;
and the output pin of the signal processing chip is used for outputting the current value.
5. The power quality monitoring circuit according to claim 4, wherein the single chip processing circuit further comprises a first capacitor, a second capacitor and a crystal oscillator;
the oscillation input end of the signal processing chip is respectively connected with the first end of the first capacitor and the first end of the crystal oscillator, and the second end of the crystal oscillator is respectively connected with the first end of the second capacitor and the oscillation output end of the signal processing chip;
and the second end of the first capacitor is connected with the second end of the second capacitor, and the second end of the second capacitor is grounded.
6. The power quality monitoring circuit of claim 4, wherein the power quality monitoring circuit further comprises a key circuit; the key circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first key, a second key, a third key, a fourth key and a first internal power supply; wherein the content of the first and second substances,
a first key pin of the signal processing chip is connected with a first end of the second resistor, a second key pin of the signal processing chip is connected with a first end of the third resistor, a third key pin of the signal processing chip is connected with a first end of the fourth resistor, and a fourth key pin of the signal processing chip is connected with a first end of the fifth resistor;
a second end of the second resistor is connected with a second end of the third resistor, a second end of the fourth resistor, a second end of the fifth resistor and the first internal power supply respectively;
the first end of the second resistor is connected with the first end of the first key, and the second end of the first key is grounded;
the first end of the third resistor is connected with the first end of the second key, and the second end of the second key is grounded;
the first end of the fourth resistor is connected with the first end of the third key, and the second end of the third key is grounded;
and the first end of the fifth resistor is connected with the first end of the fourth key, and the second end of the fourth key is grounded.
7. The power quality monitoring circuit according to claim 4, wherein the power quality monitoring circuit further comprises a power supply unit, the single chip processing circuit being connected to the power supply unit; the power supply unit comprises an external power supply, a switch, a third capacitor and a fourth capacitor;
a first end of the external power supply is connected with a first end of the switch, a second end of the switch is respectively connected with a first end of the third capacitor and a first end of the fourth capacitor, and a first end of the fourth capacitor is connected with a power input pin of the signal processing chip;
and the second end of the external power supply is respectively connected with the second end of the third capacitor and the second end of the fourth capacitor, and the second end of the fourth capacitor is grounded.
8. The power quality monitoring circuit according to claim 1, wherein the power quality monitoring circuit further comprises a buzzer alarm circuit, and the single chip processing circuit is connected with the buzzer alarm circuit; the buzzing alarm circuit comprises a sixth resistor, a triode, a buzzer and a second internal power supply; wherein the content of the first and second substances,
the single chip microcomputer processing circuit is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the base electrode of the triode, the emitting electrode of the triode is connected with the second internal power supply source, the collecting electrode of the triode is connected with the first end of the buzzer, and the second end of the buzzer is grounded.
9. The power quality monitoring circuit according to claim 1, wherein the power quality monitoring circuit further comprises a Light Emitting Diode (LED) alarm circuit, and the single chip processing circuit is connected with the LED alarm circuit; the LED alarm circuit comprises a seventh resistor, an LED and a third internal power supply; wherein the content of the first and second substances,
the single chip microcomputer processing circuit is connected with a first end of the seventh resistor, a second end of the seventh resistor is connected with a first end of the LED, and a second end of the LED is connected with the third internal power supply.
10. A power monitoring device characterized by comprising a power quality monitoring circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920613509.1U CN209961865U (en) | 2019-04-29 | 2019-04-29 | Electric energy quality monitoring circuit and electric energy monitoring equipment |
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| CN201920613509.1U CN209961865U (en) | 2019-04-29 | 2019-04-29 | Electric energy quality monitoring circuit and electric energy monitoring equipment |
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| CN209961865U true CN209961865U (en) | 2020-01-17 |
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| CN201920613509.1U Expired - Fee Related CN209961865U (en) | 2019-04-29 | 2019-04-29 | Electric energy quality monitoring circuit and electric energy monitoring equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514718A (en) * | 2021-05-13 | 2021-10-19 | 河南牧原智能科技有限公司 | Isolation monitoring device for analog signals and control system for electrical equipment |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514718A (en) * | 2021-05-13 | 2021-10-19 | 河南牧原智能科技有限公司 | Isolation monitoring device for analog signals and control system for electrical equipment |
| CN113514718B (en) * | 2021-05-13 | 2024-01-26 | 河南牧原智能科技有限公司 | Isolation monitoring device for analog signals and control system for electrical equipment |
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