CN110850161A - Power sensor - Google Patents
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- CN110850161A CN110850161A CN201911360116.5A CN201911360116A CN110850161A CN 110850161 A CN110850161 A CN 110850161A CN 201911360116 A CN201911360116 A CN 201911360116A CN 110850161 A CN110850161 A CN 110850161A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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Abstract
The invention discloses a power sensor, and relates to the technical field of detection and sensing. The power sensor includes: the device comprises a power circuit, a sampling circuit, a metering circuit, a main control circuit and a communication circuit; the communication circuit includes a Long Range Radio (LoRa). The power sensor adopts LoRa for communication, can realize long-distance and high-efficiency data reading by utilizing the networking function of a wireless grid network of the LoRa and networking with other power sensors, and has the advantages of quick networking and lower power consumption.
Description
Technical Field
The invention relates to the technical field of detection and sensing, in particular to a power sensor.
Background
The harmonic wave of the power grid can cause the power loss of the power grid to be increased, the service life of equipment to be shortened, the ground protection function to be abnormal, the remote control function to be abnormal, the line and the equipment to be overheated and the like, particularly, the third harmonic wave can generate very large neutral line current, even the zero line current of the distribution transformer exceeds the phase line current value, and unsafe operation of the equipment is caused. The effect of harmonics on the safety, stability and reliability of the grid is also manifested in the possibility of causing the grid to resonate and to interrupt the normal supply, etc. Therefore, it becomes important to know and monitor the harmonic conditions of the power grid.
For the electric power sensor, the most important is data transmission, people can focus eyes on the meter reading mode, and time and distance are the biggest enemies limiting meter reading convenience. The traditional meter reading needs manpower to read by going to the door in person, and the meter reading efficiency is low.
Disclosure of Invention
The invention aims to provide a power sensor, which solves the problem of low meter reading efficiency.
In order to achieve the purpose, the invention provides the following scheme:
a power sensor, comprising: the device comprises a power circuit, a sampling circuit, a metering circuit, a main control circuit and a communication circuit;
the input end of the power circuit is electrically connected with a three-phase alternating current power supply, and the output end of the power circuit is electrically connected with a power supply port of the main control circuit;
the input end of the sampling circuit is electrically connected with the three-phase alternating-current power supply, and the output end of the sampling circuit is electrically connected with the sampling end of the metering circuit;
the output end of the metering circuit is electrically connected with the data end of the main control circuit;
the communication circuit comprises a long-distance radio; the communication circuit is used for carrying out information interaction with the communication circuit of any one of the power sensors;
the communication end of the long-distance radio is electrically connected with the communication end of the main control circuit; the long-range radio is used for communicating with the long-range radio of any one of the power sensors.
Optionally, the power supply circuit includes: the high-voltage protection device, the non-isolated AC/DC conversion chip and the voltage-stabilizing tube;
the number of the high-voltage protection devices is 3, the input end of each group of the high-voltage protection devices is correspondingly connected with one phase of electricity of the three-phase alternating-current power supply, and the output end of each group of the high-voltage protection devices is electrically connected with the input end of the non-isolated alternating-current and direct-current conversion chip;
the output end of the non-isolated AC-DC conversion chip is electrically connected with the input end of the voltage stabilizing tube;
and the output end of the voltage-stabilizing tube is electrically connected with a power supply port of the main control circuit.
Optionally, the power circuit further includes: a synchronous voltage reduction chip;
the input end of the synchronous voltage reduction chip is electrically connected with the output end of the non-isolated alternating current-direct current conversion chip, and the output end of the synchronous voltage reduction chip is electrically connected with the power supply port of the master control circuit.
Optionally, the high voltage protection device includes: a first voltage dependent resistor, a second voltage dependent resistor and a thermistor;
the first end of the first piezoresistor and the first end of the thermistor are electrically connected with one phase of the three-phase alternating-current power supply;
the second end of the thermistor is electrically connected with the first end of the second piezoresistor and the input end of the non-isolated AC-DC conversion chip;
the second end of the first piezoresistor and the second end of the second piezoresistor are grounded.
Optionally, the sampling circuit includes: a current sampling circuit and a voltage sampling circuit;
the current sampling circuit includes: the current transformer comprises a first open-close type current transformer, a second open-close type current transformer, a third open-close type current transformer and a fourth open-close type current transformer;
the input end of the first open-close type current transformer is electrically connected with the phase A of the three-phase alternating current power supply, and the output end of the first open-close type current transformer is electrically connected with the first current sampling end of the metering circuit;
the input end of the second open-close type current transformer is electrically connected with the phase B of the three-phase alternating current power supply, and the output end of the second open-close type current transformer is electrically connected with the second current sampling end of the metering circuit;
the input end of the third open-close type current transformer is electrically connected with the C phase of the three-phase alternating current power supply, and the output end of the third open-close type current transformer is electrically connected with the third current sampling end of the metering circuit;
the input end of the fourth combined current transformer is electrically connected with the N phase of the three-phase alternating current power supply, and the output end of the fourth combined current transformer is electrically connected with the fourth current sampling end of the metering circuit;
the voltage sampling circuit includes: the sampling circuit comprises an A-phase sampling sub-circuit, a B-phase sampling sub-circuit and a C-phase sampling sub-circuit;
the input end of the A-phase sampling sub-circuit is electrically connected with the A phase of the three-phase alternating-current power supply, and the output end of the A-phase sampling sub-circuit is electrically connected with the first voltage sampling end of the metering circuit;
the input end of the B-phase sampling sub-circuit is electrically connected with a B phase of the three-phase alternating-current power supply, and the output end of the B-phase sampling sub-circuit is electrically connected with a second voltage sampling end of the metering circuit;
the input end of the C-phase sampling sub-circuit is electrically connected with the C phase of the three-phase alternating-current power supply, and the output end of the C-phase sampling sub-circuit is electrically connected with the third voltage sampling end of the metering circuit.
Optionally, the main control circuit adopts an HT6019 chip, an HT6015 chip, an HT5017 chip, or an HT6025 chip.
Optionally, the TXD interface of the long-range radio is electrically connected to the pe.2 pin of the main control circuit;
and the RXD interface of the long-distance radio is electrically connected with a PE.1 pin of the main control circuit.
Optionally, the communication circuit further includes: a near-infrared circuit;
the RXD _ IR pin of the near infrared circuit is electrically connected with the PC.12 pin of the main control circuit;
and a TXD _ IR pin of the near infrared circuit is electrically connected with a PC.11 pin of the main control circuit.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention discloses a power sensor, comprising: the device comprises a power circuit, a sampling circuit, a metering circuit, a main control circuit and a communication circuit; the communication circuit includes a Long Range Radio (LoRa). The invention adopts LoRa for communication, can utilize the Mesh (wireless grid network) networking function of LoRa to carry out networking with other power sensors, realizes long-distance and high-efficiency data reading, and has the advantages of quick networking and lower power consumption.
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 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 for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a power sensor provided in an embodiment of the present invention;
FIG. 2 is a circuit diagram of a power circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a current sampling circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a voltage sampling circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a metering circuit according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a master control circuit according to an embodiment of the present invention;
fig. 7 is a circuit diagram of LoRa according to an embodiment of the present invention;
fig. 8 is a circuit diagram of a near-infrared circuit according to an embodiment of the present invention.
Wherein, 1, a power circuit; 2. a sampling circuit; 3. a metering circuit; 4. a master control circuit; 5. a communication circuit; 6. a first open-close type current transformer; 7. a second open-close type current transformer; 8. a third open-close type current transformer; 9. a fourth combined current transformer; 10. an A-phase sampling sub-circuit; 11. a B-phase sampling sub-circuit; 12. a C-phase sampling sub-circuit; 13. a receiving circuit of the near-infrared circuit; 14. and a transmitting line of the near infrared circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The invention aims to provide a power sensor, which solves the problem of low meter reading efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a structural diagram of an electrical sensor according to an embodiment of the present invention. Referring to fig. 1, the power sensor includes: the device comprises a power supply circuit 1, a sampling circuit 2, a metering circuit 3, a main control circuit 4 and a communication circuit 5.
The input end of the power circuit 1 is electrically connected with a three-phase alternating current power supply, and the output end of the power circuit 1 is electrically connected with a power supply port of the main control circuit 4.
The power supply circuit 1 includes: the high-voltage protection device, non-isolation AC-DC conversion chip and stabilivolt.
The quantity of high-voltage protection device is 3 groups, and the input of every group high-voltage protection device all corresponds the one-phase electricity of connecting three-phase alternating current power supply, and the output of every group high-voltage protection device all is connected with the input electricity of non-isolation alternating current-direct current conversion chip.
The high-voltage protection device comprises: a first piezo-resistor, a second piezo-resistor and a thermistor.
The first end of the first piezoresistor and the first end of the thermistor are electrically connected with one phase of a three-phase alternating current power supply.
The second end of the thermistor is respectively and electrically connected with the first end of the second piezoresistor and the input end of the non-isolated AC-DC conversion chip.
The second end of the first piezoresistor and the second end of the second piezoresistor are grounded.
The output end of the non-isolated AC-DC conversion chip is electrically connected with the input end of the voltage stabilizing tube.
The output end of the voltage-stabilizing tube is electrically connected with the power supply port of the main control circuit 4.
The power supply circuit 1 further includes: synchronous buck chip.
The input end of the synchronous buck chip is electrically connected with the output end of the non-isolated AC-DC conversion chip, and the output end of the synchronous buck chip is electrically connected with the power supply port of the main control circuit 4.
Fig. 2 is a circuit diagram of a power circuit according to an embodiment of the invention. In the embodiment, the second piezoresistor RU and the thermistor RM are packaged together to form a packaging element, the first end of the thermistor RM is an input end of the packaging element, the second end of the second piezoresistor RU is a ground end of the packaging element, and the second end of the thermistor RM is electrically connected with the first end of the second piezoresistor RU to serve as an output end of the packaging element. The present embodiment provides a specific implementation of a power supply circuit:
referring to fig. 2, the power supply circuit includes: the device comprises a first high-voltage protection device, a second high-voltage protection device, a third high-voltage protection device, a non-isolated AC-DC conversion chip, a voltage-stabilizing tube and a synchronous voltage-reducing chip.
The input end of the first high-voltage protection device is connected with a C-phase power L3 of a three-phase alternating-current power supply, and the method specifically comprises the following steps: the C-phase power L3 of the three-phase alternating-current power supply is respectively electrically connected with the first end of a piezoresistor RU1 of the first high-voltage protection device and the input end of a packaging element RT1 of the first high-voltage protection device, the second end of the piezoresistor RU1 and the grounding end of the packaging element RT1 are both grounded, the output end of the packaging element RT1 is electrically connected with the positive electrode of a diode D1, the negative electrode of the diode D1 is electrically connected with the positive electrode of a diode D2, and the negative electrode of a diode D2 is electrically connected with a pin 1 of a pin bank jack J2. DIODE in fig. 2 represents a DIODE.
The input end of the second high-voltage protection device is connected with a B-phase power L2 of the three-phase alternating-current power supply, and the method specifically comprises the following steps: the B-phase power L2 of the three-phase alternating-current power supply is respectively electrically connected with the first end of a piezoresistor RU2 of the second high-voltage protection device and the input end of a packaging element RT2 of the second high-voltage protection device, the second end of the piezoresistor RU2 and the grounding end of the packaging element RT2 are both grounded, the output end of the packaging element RT2 is electrically connected with the positive electrode of a diode D4, the negative electrode of the diode D4 is electrically connected with the positive electrode of a diode D5, and the negative electrode of a diode D5 is electrically connected with a pin 1 of the pin bank jack J2.
The input end of the third high-voltage protection device is connected with an A-phase power L1 of the three-phase alternating-current power supply, and the method specifically comprises the following steps: the A-phase power L1 of the three-phase alternating-current power supply is respectively electrically connected with the first end of a piezoresistor RU3 of the third high-voltage protection device and the input end of a packaging element RT3 of the third high-voltage protection device, the second end of the piezoresistor RU3 and the ground end of the packaging element RT3 are both grounded, the output end of the packaging element RT3 is electrically connected with the positive electrode of a diode D7, the negative electrode of the diode D7 is electrically connected with the positive electrode of a diode D8, and the negative electrode of a diode D8 is respectively electrically connected with a pin 1 of a pin bank jack J2, a pin 1 of a pin bank jack J3, the first end of a capacitor C12, the positive electrode of a capacitor C13, the positive electrode of the capacitor C14 and a D interface of a. The hot in the package element RT1, the package element RT2, and the package element RT3 in fig. 2 represent thermistors. The model numbers of the piezoresistor RU1, the piezoresistor RU2 and the piezoresistor RU3 are 10D 681. The non-isolated ac/dc conversion chip IC1 is a chip capable of implementing an ac step-down function, and the specific model may be PN8016 or LNK 624. Pin header J2 is connected to pin header J3 via pins, and after pins are inserted into pin header J2 and pin header J3, diode D2, diode D5, and diode D7 are connected to capacitor C12. CON3 indicates that the reserved via holes are 3, i.e. pin header J2 includes 3 reserved via holes and pin header J3 includes 3 reserved via holes.
The BP interface of the non-isolated AC-DC conversion chip IC1 is electrically connected with the first end of the capacitor C2, the FB interface of the non-isolated AC-DC conversion chip IC1 is electrically connected with the first end of the capacitor C4, and the S interface of the non-isolated AC-DC conversion chip IC1 and the second end of the capacitor C2 are both electrically connected with the cathode of the diode D6. The first end of the capacitor C4 is electrically connected to the first end of the resistor R2 and the first end of the resistor R1, respectively, and the second end of the capacitor C4 and the second end of the resistor R2 are both electrically connected to the cathode of the diode D6. The second end of the resistor R1 is electrically connected to the first end of the capacitor C6 and the cathode of the diode D3, respectively. The second end of the capacitor C6 is electrically connected to the second end of the resistor R2 and the first end of the inductor L2, respectively. The resistance of the resistor R2 is 3 kilo-ohms, and the resistance of the resistor R1 is 12 kilo-ohms. The anode of the diode D3 is electrically connected to the second terminal of the inductor L2. The inductance of the inductor L2 is 1 millihenry (mH). The anode of the diode D6, the cathode of the capacitor C15, and the first end of the resistor R8 are all grounded. The positive electrode of the capacitor C15 and the second end of the resistor R8 are both electrically connected to the voltage output terminal VIN. The type of the diode D6 is US1M, the capacitor C15 is a polar capacitor, the specification of the capacitor C15 is 470UF/25V, and the resistance value of the resistor R8 is 12 kilo (K) ohms. The Vin end of the voltage regulator tube IC4 is electrically connected with the voltage output end VIN and the second end of the inductor L2 respectively, the GIN grounding end of the voltage regulator tube IC4 is grounded, the 5V output end of the voltage regulator tube IC4 outputs 5V voltage, and the model of the voltage regulator tube IC4 is 1117-5V. The second terminal of the capacitor C47 is connected to ground. The second end of the resistor R4 is electrically connected with the EN end of the synchronous buck chip IC3 and the first end of the resistor R7 respectively, and the second end of the resistor R7 is grounded; the resistance of the resistor R4 is 3 kilo-ohms and the resistance of the resistor R7 is 1 kilo-ohms. The grounding end of the synchronous buck chip IC3 is grounded, the BS end of the synchronous buck chip IC3 is electrically connected with the first end of the capacitor C3, the second end of the capacitor C3 is electrically connected with the LX end of the synchronous buck chip IC3, and the LX end of the synchronous buck chip IC3 is also electrically connected with the first end of the inductor L1. The second end of the inductor L1 is electrically connected to the first end of the resistor R3 and the first end of the capacitor C8, respectively. The second end of the resistor R3 is electrically connected with the first end of the resistor R5, and the second end of the resistor R5 is grounded; the resistance of the resistor R3 is 100 kilo-ohms, and the resistance of the resistor R5 is 24 kilo-ohms. The first terminal of the capacitor C8 is also electrically connected to the first terminal of the capacitor C9, and the first terminal of the capacitor C8 and the first terminal of the capacitor C9 are used for outputting 5v, and the second terminal of the capacitor C8 and the second terminal of the capacitor C9 are both grounded.
The power circuit of this embodiment adopts the mode of three-phase access, and the incoming end of first high voltage protection device, second high voltage protection device, third high voltage protection device corresponds the connection respectively and is A looks electricity, B looks electricity, C looks electricity. Meanwhile, voltage clamping is realized through the combination of the piezoresistor and the thermistor, and subsequent circuits are protected. The main principle of realizing voltage clamping by combining the piezoresistor and the thermistor is as follows: the varistor is when the overvoltage, the resistance of varistor can the index rise, and thermistor is when the temperature rises, thermistor's resistance also can rise rapidly, in the condition of voltage input overvoltage in fig. 2, varistor RU1, RU2 and RU 3's resistance rises, add at RU1, RU2 and RU3 both ends voltage unchangeable, make RU1, RU2 and RU3 generate heat bigger, thereby make the thermistor resistance increase, and then counteract on varistor, realize reducing the effect of varistor both ends voltage, further clamp the voltage at a normal level, guarantee even wrong access to the ammeter can not burn out the ammeter. The power supply circuit is used for reducing voltage through a non-isolated AC/DC conversion chip IC1 and outputting 12V voltage to a voltage output end VIN, the voltage output end VIN is connected with two voltage stabilizing circuits, one voltage stabilizing circuit is used for stabilizing voltage through a 5V voltage stabilizing tube IC4 with the model number of 1117-5V and outputting 5V voltage; the other voltage stabilizing circuit reduces the voltage of 12V to 5V through a synchronous voltage reduction chip IC3 with the model number of SY 8113. The two voltage stabilizing circuits can output 5V voltage to supply power for the main control circuit.
The input end of the sampling circuit 2 is electrically connected with a three-phase alternating current power supply, and the output end of the sampling circuit 2 is electrically connected with the sampling end of the metering circuit 3.
The sampling circuit 2 includes: a current sampling circuit and a voltage sampling circuit.
The current sampling circuit includes: a first open/close type Current Transformer (CT) 6, a second open/close type Current Transformer 7, a third open/close type Current Transformer 8, and a fourth open/close type Current Transformer 9.
The input end of the first open-close type current transformer 6 is electrically connected with the phase A of the three-phase alternating current power supply, and the output end of the first open-close type current transformer 6 is electrically connected with the first current sampling end of the metering circuit 3.
The input end of the second open-close type current transformer 7 is electrically connected with the phase B of the three-phase alternating current power supply, and the output end of the second open-close type current transformer 7 is electrically connected with the second current sampling end of the metering circuit 3.
The input end of the third open-close type current transformer 8 is electrically connected with the C phase of the three-phase alternating current power supply, and the output end of the third open-close type current transformer 8 is electrically connected with the third current sampling end of the metering circuit 3.
The input end of the fourth combined current transformer 9 is electrically connected with the N phase of the three-phase alternating current power supply, and the output end of the fourth combined current transformer 9 is electrically connected with the fourth current sampling end of the metering circuit 3.
Fig. 3 is a circuit diagram of a current sampling circuit according to an embodiment of the present invention, where in fig. 3, CON2 indicates that there are 2 reserved interfaces, specifically, an output end of a first open/close type current transformer CT1 includes 2 reserved interfaces, an output end of a second open/close type current transformer CT2 includes 2 reserved interfaces, an output end of a third open/close type current transformer CT3 includes 2 reserved interfaces, and an output end of a fourth open/close type current transformer CT4 includes 2 reserved interfaces. Referring to fig. 3, an input terminal of the first open/close type current transformer CT1 is electrically connected to a phase a of the three-phase ac power, a second interface of the first open/close type current transformer CT1 is electrically connected to a first terminal of the switching diode D9, and a first interface of the first open/close type current transformer CT1 is electrically connected to a third terminal of the switching diode D9. The model of the switch diode D9 is BAV99, the first end of the switch diode D9 is electrically connected with the first end of the resistor R18, the third end of the switch diode D9 is electrically connected with the first end of the resistor R22, and the second end of the switch diode D9 is electrically connected with the first end of the resistor R18. The first end of the resistor R18 is also electrically connected with the first end of the resistor R15, the first end of the resistor R22 is also electrically connected with the first end of the resistor R24, and the second end of the resistor R18 and the second end of the resistor R22 are both grounded; the resistance of the resistor R18 is 1.2R (ohm), the resistance of the resistor R22 is 1.2R, the resistance of the resistor R15 is 1 kiloohm, and the resistance of the resistor R24 is 1 kiloohm. The second end of the resistor R15 is electrically connected with the first end of the capacitor C18, and the second end of the capacitor C18 is grounded; the second end of the resistor R24 is electrically connected with the first end of the capacitor C22, and the second end of the capacitor C22 is grounded; the capacitance of capacitor C18 is 33 nano-farads (nF), and the capacitance of capacitor C22 is 33 nano-farads (nF). The first end of the capacitor C18 is also used as an IAP output end of the first open-close type current transformer and electrically connected with the first current sampling end of the metering circuit, and the first end of the capacitor C22 is also used as an IAN output end of the first open-close type current transformer and electrically connected with the first current sampling end of the metering circuit.
The input end of the second open-close type current transformer CT2 is electrically connected with the B phase of the three-phase alternating current power supply, the second interface of the second open-close type current transformer CT2 is electrically connected with the first end of the switch diode D10, and the first interface of the first open-close type current transformer CT2 is electrically connected with the third end of the switch diode D10. The model of the switch diode D10 is BAV99, the first end of the switch diode D10 is electrically connected with the first end of the resistor R32, the third end of the switch diode D10 is electrically connected with the first end of the resistor R35, and the second end of the switch diode D10 is electrically connected with the first end of the resistor R32. The first end of the resistor R32 is also electrically connected with the first end of the resistor R59, the first end of the resistor R35 is also electrically connected with the first end of the resistor R36, and the second end of the resistor R32 and the second end of the resistor R35 are both grounded; the resistance of the resistor R32 is 1.2R, the resistance of the resistor R35 is 1.2R, the resistance of the resistor R59 is 1 kiloohm, and the resistance of the resistor R36 is 1 kiloohm. The second end of the resistor R59 is electrically connected with the first end of the capacitor C25, and the second end of the capacitor C25 is grounded; the second end of the resistor R36 is electrically connected with the first end of the capacitor C27, and the second end of the capacitor C27 is grounded; the capacitance of capacitor C25 is 33 nano-farads (nF), and the capacitance of capacitor C27 is 33 nano-farads (nF). The first end of the capacitor C25 is also used as the IBP output end of the first open-close type current transformer and is electrically connected with the second current sampling end of the metering circuit, and the first end of the capacitor C27 is also used as the IBN output end of the first open-close type current transformer and is electrically connected with the second current sampling end of the metering circuit.
The input end of the third open-close current transformer CT3 is electrically connected with the C phase of the three-phase ac power supply, the second interface of the third open-close current transformer CT3 is electrically connected with the first end of the switching diode D11, and the first interface of the third open-close current transformer CT3 is electrically connected with the third end of the switching diode D11. The model of the switch diode D11 is BAV99, the first end of the switch diode D11 is electrically connected with the first end of the resistor R40, the third end of the switch diode D11 is electrically connected with the first end of the resistor R46, and the second end of the switch diode D11 is electrically connected with the first end of the resistor R40. The first end of the resistor R40 is also electrically connected with the first end of the resistor R38, the first end of the resistor R46 is also electrically connected with the first end of the resistor R47, and the second end of the resistor R40 and the second end of the resistor R46 are both grounded; the resistance of the resistor R40 is 1.2R, the resistance of the resistor R46 is 1.2R, the resistance of the resistor R38 is 1 kiloohm, and the resistance of the resistor R47 is 1 kiloohm. The second end of the resistor R38 is electrically connected with the first end of the capacitor C34, and the second end of the capacitor C34 is grounded; the second end of the resistor R47 is electrically connected with the first end of the capacitor C39, and the second end of the capacitor C39 is grounded; the capacitance of capacitor C34 is 33 nano-farads (nF), and the capacitance of capacitor C39 is 33 nano-farads (nF). The first end of the capacitor C34 is also used as the ICP output end of the third open-close type current transformer and is electrically connected with the third current sampling end of the metering circuit, and the first end of the capacitor C39 is also used as the ICN output end of the third open-close type current transformer and is electrically connected with the third current sampling end of the metering circuit.
The input end of the fourth combined current transformer CT4 is electrically connected with the N phase of the four-phase alternating current power supply, the second interface of the fourth combined current transformer CT4 is electrically connected with the first end of the switch diode D12, and the first interface of the fourth combined current transformer CT4 is electrically connected with the third end of the switch diode D12. The model of the switch diode D12 is BAV99, the first end of the switch diode D12 is electrically connected with the first end of the resistor R52, the third end of the switch diode D12 is electrically connected with the first end of the resistor R53, and the second end of the switch diode D12 is electrically connected with the first end of the resistor R52. The first end of the resistor R52 is also electrically connected with the first end of the resistor R50, the first end of the resistor R53 is also electrically connected with the first end of the resistor R54, and the second end of the resistor R52 and the second end of the resistor R53 are both grounded; the resistance of the resistor R52 is 1.2R, the resistance of the resistor R53 is 1.2R, the resistance of the resistor R50 is 1 kiloohm, and the resistance of the resistor R54 is 1 kiloohm. The second end of the resistor R50 is electrically connected with the first end of the capacitor C45, and the second end of the capacitor C45 is grounded; the second end of the resistor R54 is electrically connected with the first end of the capacitor C46, and the second end of the capacitor C46 is grounded; the capacitance of capacitor C45 is 33 nano-farads (nF), and the capacitance of capacitor C46 is 33 nano-farads (nF). The first end of the capacitor C45 is also used as the INP output end of the fourth combined current transformer and is electrically connected with the fourth current sampling end of the metering circuit, and the first end of the capacitor C46 is also used as the INN output end of the fourth combined current transformer and is electrically connected with the fourth current sampling end of the metering circuit.
The Current sampling circuit of the embodiment has 4 paths of open-close type Current Transformers (CT) as an access end, and can measure zero line Current in addition to three-phase Current; the current transformer is adopted to carry out mutual inductance type sampling, the mutual inductance type sampling has the advantages of safety, the open-close type CT principle is that the current on a sampling line is induced through a magnetic coil, induced current with a certain coefficient multiple is generated, and the actual current is calculated through detecting the magnitude of the induced current.
Fig. 4 is a circuit diagram of a voltage sampling circuit according to an embodiment of the present invention, and referring to fig. 4, the voltage sampling circuit includes: an a-phase sampling sub-circuit 10, a B-phase sampling sub-circuit 11, and a C-phase sampling sub-circuit 12.
The input end of the A-phase sampling sub-circuit 10 is electrically connected with the A-phase of the three-phase alternating-current power supply, and the output end of the A-phase sampling sub-circuit 10 is electrically connected with the first voltage sampling end of the metering circuit. Specifically, a first end of a resistor R41 serving as an input end of the a-phase sampling sub-circuit is connected to an a-phase power L1 of the three-phase ac power supply, a second end of a resistor R41 is electrically connected to a first end of a resistor R42, a second end of the resistor R42 is electrically connected to a first end of a resistor R43, a second end of a resistor R43 is electrically connected to a first end of a resistor R44, a second end of the resistor R44 is electrically connected to a first end of a resistor R45, and a second end of the resistor R45 is electrically connected to a first end of a resistor R48; the resistances of resistor R41, resistor R42, resistor R43, resistor R44, and resistor R45 are all 180 kilo (K) ohms. The first end of the resistor R48 is also electrically connected with the first end of the capacitor C40, and the first end of the capacitor C40 is electrically connected with the first voltage sampling end of the metering circuit as the VAP output end of the A-phase sampling sub-circuit; the second end of the resistor R49 is electrically connected with the second end of the capacitor C43 and then is electrically connected with the first voltage sampling end of the metering circuit as the VAN output end of the A-phase sampling sub-circuit, and the second end of the resistor R48, the first end of the resistor R49, the second end of the capacitor C40 and the first end of the capacitor C43 are all grounded. The resistance values of the resistor R48 and the resistor R49 are both 1K ohm, and the capacitance values of the capacitor C40 and the capacitor C43 are 33 nano Farad (nF).
The input end of the B-phase sampling sub-circuit 11 is electrically connected with a B phase of a three-phase alternating current power supply, and the output end of the B-phase sampling sub-circuit 11 is electrically connected with a second voltage sampling end of the metering circuit. Specifically, a first end of a resistor R27 is used as an input end of the B-phase sampling sub-circuit to be connected with a B-phase power L2 of a three-phase alternating-current power supply, a second end of a resistor R27 is electrically connected with a first end of a resistor R28, a second end of the resistor R28 is electrically connected with a first end of a resistor R29, a second end of a resistor R29 is electrically connected with a first end of a resistor R30, a second end of the resistor R30 is electrically connected with a first end of a resistor R31, and a second end of the resistor R31 is electrically connected with a first end of a resistor R33; the resistances of the resistor R27, the resistor R28, the resistor R29, the resistor R30 and the resistor R31 are all 180K ohms. The first end of the resistor R33 is also electrically connected with the first end of the capacitor C26, and the first end of the capacitor C26 is electrically connected with the second voltage sampling end of the metering circuit as the VBP output end of the B-phase sampling sub-circuit; the second end of the resistor R37 is electrically connected with the second end of the capacitor C28 and then serves as the VBN output end of the B-phase sampling sub-circuit to be electrically connected with the second voltage sampling end of the metering circuit, and the second end of the resistor R33, the first end of the resistor R37, the second end of the capacitor C26 and the first end of the capacitor C28 are all grounded. The resistance values of the resistor R33 and the resistor R37 are both 1K ohm, and the capacitance values of the capacitor C26 and the capacitor C28 are 33 nano Farad (nF).
The input end of the C-phase sampling sub-circuit 12 is electrically connected with the C phase of the three-phase alternating-current power supply, and the output end of the C-phase sampling sub-circuit 12 is electrically connected with the third voltage sampling end of the metering circuit. Specifically, a first end of a resistor R10 is connected to a C-phase power L3 of a three-phase ac power supply as an input end of a C-phase sampling sub-circuit, a second end of a resistor R10 is electrically connected to a first end of a resistor R11, a second end of the resistor R11 is electrically connected to a first end of a resistor R12, a second end of a resistor R12 is electrically connected to a first end of a resistor R13, a second end of the resistor R13 is electrically connected to a first end of a resistor R14, and a second end of the resistor R14 is electrically connected to a first end of a resistor R16; the resistances of the resistor R10, the resistor R11, the resistor R12, the resistor R13 and the resistor R14 are all 180 kilo-ohms. The first end of the resistor R16 is also electrically connected with the first end of the capacitor C17, and the first end of the capacitor C17 is electrically connected with the third voltage sampling end of the metering circuit as the VCP output end of the C-phase sampling sub-circuit; the second end of the resistor R21 is electrically connected with the second end of the capacitor C20 and then serves as the VCN output end of the C-phase sampling sub-circuit to be electrically connected with the third voltage sampling end of the metering circuit, and the second end of the resistor R16, the first end of the resistor R21, the second end of the capacitor C17 and the first end of the capacitor C20 are all grounded. The resistance values of the resistor R16 and the resistor R21 are both 1K ohm, and the capacitance values of the capacitor C17 and the capacitor C20 are 33 nano Farad (nF).
The A-phase sampling sub-circuit, the B-phase sampling sub-circuit and the C-phase sampling sub-circuit of the voltage sampling circuit are respectively connected with a three-phase live wire, and a three-phase null wire is grounded. The voltage sampling module adopts a voltage division principle and consists of 5 resistors of 180k ohms and two resistors of 1k ohms, taking the phase A as an example, the voltage collected by the VAP output end is on the 1k ohm resistor R48 of the VAP output end to the ground, namely the voltage between the resistor R48 and the resistor R45; the VAN output end collects voltage below a 1k ohm resistor R49 to the ground, namely voltage between a resistor R49 and a capacitor C43, the voltage collected by the VAN output end is zero voltage, the VAP output end of the A-phase sampling sub-circuit and the VAN output end serving as the A-phase sampling sub-circuit serve as a group of differential signals to be input into a metering chip, and the other two live wires, namely the B-phase and the C-phase, and one zero wire N are in the same principle.
The output end of the metering circuit 3 is electrically connected with the data end of the main control circuit 4. The metering circuit 3 adopts a metering chip with voltage data waveform sampling and current data waveform sampling, the model of the metering chip is RN8302, and the sampling data of the sampling circuit can be analyzed to calculate the active power and the reactive power in the circuit and output the data of the voltage and the current of the circuit.
Fig. 5 is a circuit diagram of a metering circuit according to an embodiment of the present invention, and referring to fig. 5, an IAP interface of the metering chip IC7 is electrically connected to a first terminal of the capacitor C18 of the first open-close type current transformer, and an IAN interface of the metering chip IC7 is electrically connected to a first terminal of the capacitor C22 of the first open-close type current transformer. The IBP interface of the metering chip IC7 is electrically connected with the first end of the capacitor C25 of the second open-close type current transformer, and the IBN interface of the metering chip IC7 is electrically connected with the first end of the capacitor C27 of the second open-close type current transformer. An ICP interface of the metering chip IC7 is electrically connected with a first end of a capacitor C34 of the third open-close type current transformer, and an ICN interface of the metering chip IC7 is electrically connected with a first end of a capacitor C39 of the third open-close type current transformer. The INP interface of the metering chip IC7 is electrically connected with the first end of the capacitor C45 of the fourth combined current transformer, and the INN interface of the metering chip IC7 is electrically connected with the first end of the capacitor C46 of the fourth combined current transformer.
The VAP interface of the metering chip IC7 is electrically connected to a first terminal of the capacitor C40 of the a-phase sampling sub-circuit, and the VAN interface of the metering chip IC7 is electrically connected to a second terminal of the capacitor C43 of the a-phase sampling sub-circuit. The VBP interface of the metering chip IC7 is electrically connected with the first end of the capacitor C26 of the B-phase sampling sub-circuit, and the VBN interface of the metering chip IC7 is electrically connected with the second end of the capacitor C28 of the B-phase sampling sub-circuit. The VCP interface of the metering chip IC7 is electrically connected with the first end of the capacitor C17 of the C-phase sampling sub-circuit, and the VCN interface of the metering chip IC7 is electrically connected with the second end of the capacitor C20 of the C-phase sampling sub-circuit.
The AGND interface, the DGND interface, and the RA interface of the metering chip IC7 are all grounded. The REFV interface of the metering chip IC7 is electrically connected with the first end of the capacitor C30 and the first end of the capacitor C29 respectively, and is used for decoupling the metering chip IC 7; the second terminal of the capacitor C29 and the second terminal of the capacitor C30 are both grounded. The PM interface of the metering chip IC7 is electrically connected with the first end of the resistor R34, the RC interface of the metering chip IC7 is electrically connected with the second end of the resistor R34, and the second end of the resistor R34 is grounded. The VO interface of the metering chip IC7 is electrically connected with the first end of the capacitor C33 and the first end of the capacitor C31 respectively and is used for decoupling the metering chip IC 7; the second terminal of the capacitor C33 and the second terminal of the capacitor C31 are both grounded. The RSTN interface of the metering chip IC7 is electrically connected with the first end of the capacitor C44 and is used for raising the voltage of the reset pin of the metering chip IC7 and ensuring the normal work of the metering chip IC 7. The resistance of the resistor R34 is 1 kilo-ohm, and the resistance of the resistor R51 is 1 kilo-ohm.
In fig. 5, V3.3_8302 represents a 3.3 volt (V) power supply, and the RB interface of the meter chip IC7, the DVCC interface of the pin 40, and the DVCC interface of the pin 28 are all electrically connected to the 3.3V power supply. The first terminal of the capacitor C41 and the first terminal of the capacitor C42 are both electrically connected to a 3.3V power supply, and the second terminal of the capacitor C41 and the second terminal of the capacitor C42 are both grounded for decoupling the 3.3V power supply of the metrology chip IC 7. A first end of the resistor R51 is electrically connected with a 3.3V power supply and is used for decoupling the 3.3V power supply of the metering chip IC 7; the second end of the resistor R51 is electrically connected to the first end of the capacitor C44, and the second end of the capacitor C44 is grounded.
The metering chip of this embodiment is connected to the main control circuit in a communication manner through a communication protocol standard Interface SPI, and is configured to implement Serial Peripheral Interface (SPI) communication with the main control circuit. Communication protocol standard interface SPI includes enable pin SCLK, enable pin SDO, enable pin SDI and enable pin SCSN, transmits active power, reactive power, voltage waveform data and the electric current waveform data among the three-phase alternating current power supply circuit who detects for master control circuit through SPI bus protocol. The SPI communication supports full duplex operation, and is simple to operate and high in data transmission rate.
The main control circuit can adopt any single chip, and the preferred chip model of the embodiment is HT6019, HT6015, HT5017 or HT 6025.
Fig. 6 is a circuit diagram of a main control circuit provided in an embodiment of the present invention, and referring to fig. 6, the main control circuit of this embodiment adopts an HT6019 chip, a COM3 interface of an HT6019 chip IC6 is electrically connected to an enable pin SCLK of a metering chip IC7, a COM2 interface of an HT6019 chip IC6 is electrically connected to an enable pin SDI of a metering chip IC7, a COM1 interface of an HT6019 chip IC6 is electrically connected to an enable pin SCSN of the metering chip IC7, a COM0 interface of an HT6019 chip IC6 is electrically connected to an enable pin SDO of a metering chip IC7, and an INT4 interface of the HT6019 chip IC6 is electrically connected to an INTN interface of the metering chip IC 7. A pin RST of the HT6019 chip IC6 is electrically connected with a first end of a capacitor C36 and used for raising the voltage of a reset pin of the HT6019 chip IC 6; the second terminal of the capacitor C36 is connected to ground. The pin RST of the HT6019 chip IC6 is also electrically connected to the first end of the resistor R39, and the second end of the resistor R39 is electrically connected to the VCC interface of the HT6019 chip IC6, so as to filter the power of the HT6019 chip IC6 and ensure the normal operation of the HT6019 chip IC 6. The OSCI interface of the HT6019 chip IC6 is electrically connected with the first end of a high-frequency crystal oscillator XT2, and the second end of the high-frequency crystal oscillator XT2 is electrically connected with the OSCO interface of the HT6019 chip IC 6. The TCK interface of the HT6019 chip IC6 is electrically connected with a pin 5 of a pin header jack J8 of a chip program burning port, the TDI interface of the HT6019 chip IC6 is electrically connected with a pin 4 of a pin header jack J8 of the chip program burning port, the TMS interface of the HT6019 chip IC6 is electrically connected with a pin 3 of a pin header jack J8 of the chip program burning port, the TDO interface of the HT6019 chip IC6 is electrically connected with a pin 2 of a pin header jack J8 of the chip program burning port, the TEST interface of the HT6019 chip IC6 is electrically connected with a pin 6 of a pin header jack J8 of the chip program burning port, the JTAG interface of the HT6019 chip IC6 is electrically connected with a pin 7 of a pin header jack J8 of the chip program burning port, a pin header jack J8 of the chip program burning port is electrically connected with a VCC interface of the HT6019 chip IC6, and a pin 8 of the pin header J8 of the chip program burning port is grounded. The VCC interface of the HT6019 chip IC6 is further electrically connected to the first terminal of the capacitor C32, the VDD interface of the HT6019 chip IC6 is electrically connected to the first terminal of the capacitor C35, and the second terminal of the capacitor C32, the DGND interface of the HT6019 chip IC6, and the second terminal of the capacitor C35 are all grounded, so as to filter the power supply of the HT6019 chip IC 6. The resistance of the resistor R39 is 12 kilo (K) ohms, and the crystal oscillator of the high-frequency crystal oscillator XT2 is 32.768KHz (kilohertz); in fig. 6, CON8 indicates that the number of reserved through holes in pin header J8 of the chip program recording port is 8.
The main control circuit of this embodiment is used for calculating the electric quantity according to the active power and the reactive power of metering circuit transmission, calculates Total Harmonic Distortion (THD) through the waveform sampling data of voltage and the waveform sampling data of electric current to store electric quantity and THD to and transmit for the host computer through communication circuit, conveniently check meter. The host computer adopts the computer, and the computer is connected with loRa, and the computer is used for accepting the data of loRa transmission.
The communication circuit 5 includes a long-range radio; the communication circuit 5 is used for being in communication connection with the communication circuit of any one power sensor and the upper computer.
A communication end of a Long Range Radio (LoRa) is electrically connected with a communication end of the main control circuit; the long-range radio is used to communicate with the long-range radio of any one of the power sensors. The preferred LoRa models of this embodiment are NICERF LoRa610PRO and NICERF LoRa6100 PRO.
The TXD interface of the remote radio is electrically connected with a PE.2 pin of the main control circuit; the RXD interface of the long-distance radio is electrically connected with the PE.1 pin of the main control circuit. Fig. 7 is a circuit diagram of LoRa according to an embodiment of the present invention. The LoRa is connected to the main control circuit HT6019 chip through a Universal Asynchronous Receiver/Transmitter (UART) interface, specifically, referring to fig. 7, a TXD interface of LoRaU1 is electrically connected to a pe.2 pin of the main control circuit HT6019 chip IC6, and an RXD interface of LoRaU1 is electrically connected to a pe.1 pin of the main control circuit HT6019 chip IC 6. A TMR0 interface of the master control circuit HT6019 chip IC6 is electrically connected with a PE1 interface of LoRaU1 and used for controlling LoRa; the TMR1 interface of the main control circuit HT6019 chip IC6 is electrically connected with the RST interface of LoRaU1 and is used for controlling LoRa reset. The VCC interface of LoRaU1 is connected to a 5-volt power supply, and the GND interface of LoRaU1 is connected to Ground (GND). The ATN1 interface of LoRaU1 is electrically connected with the input end of antenna welding port J9, and the ATN2 interface of LoRaU1 is electrically connected with the input end of antenna welding port J10. The PB13 pin of LoRaU1 is electrically connected with the first end of a resistor R55, the second end of the resistor R55 is electrically connected with the anode of a light-emitting diode LED2, the cathode of the light-emitting diode LED2 is grounded, and the resistance value of the resistor R55 is 1 kiloohm. The PB14 pin of LoRaU1 is electrically connected with the first end of a resistor R56, the second end of the resistor R56 is electrically connected with the anode of a light-emitting diode LED3, the cathode of the light-emitting diode LED3 is grounded, and the resistance value of the resistor R56 is 1 kiloohm. The antenna welding port is used for welding an antenna, the specification of the antenna welding port J9 is different from that of the antenna welding port J10, and the model of the antenna welded by the antenna welding port J9 is different from that of the antenna welding port J10; the different antenna welding mouth of two specifications is connected to loRa, can weld the antenna of different specifications. U1 in fig. 3 represents LoRa; CON1 indicates that the number of reserved interfaces is 1, specifically, the output end of the antenna welding interface J9 includes 1 reserved interface, and the output end of the antenna welding interface J10 includes 1 reserved interface; the LED/DIP indicates that the light emitting diode is packaged in a dual in-line manner, and specifically, the light emitting diode LED2 and the light emitting diode LED3 are packaged in a dual in-line manner.
In the embodiment, LoRa is adopted, networking is carried out through a protocol of LoRa with firmware, and the meter reading efficiency is improved through a wireless network grid (Mesh) networking mode of LoRa.
The communication circuit 5 further includes: a near infrared circuit.
The RXD _ IR pin of the near infrared circuit is electrically connected with the PC.12 pin of the main control circuit; and a TXD _ IR pin of the near infrared circuit is electrically connected with a PC.11 pin of the main control circuit.
Fig. 8 is a circuit diagram of a near-infrared circuit according to an embodiment of the present invention, and referring to fig. 8, a receiving circuit 13 of the near-infrared circuit includes: the infrared receiving tube IR1, resistor R63, resistor R61, resistor R60 and triode Q2. The first end of the infrared receiving tube IR1 is electrically connected with the first end of the resistor R60, and the first end of the resistor R60 is also electrically connected with a power supply VCC; a second end of the infrared receiving tube IR1 is electrically connected with a first end of the resistor R63 and a first end of the resistor R61 respectively; the second end of the resistor R60 is electrically connected with the collector of the triode Q2, the RXD _ IR pin serving as a near infrared circuit is electrically connected with the PC.12 pin of the IC6 of the main control circuit HT6019 chip, the second end of the resistor R61 is electrically connected with the base of the triode Q2, and the second end of the resistor R63 and the emitter of the triode Q2 are grounded. The model of the infrared receiving tube IR1 is BPD-BQBA31, the resistance value of the resistor R60 is 10 kilo-ohms, the resistance value of the resistor R61 is 3 kilo-ohms, the resistance value of the resistor R63 is 68 kilo-ohms, and the model of the triode Q2 is J3Y.
The transmission line 14 of the near-infrared circuit includes: an infrared emitting tube LED4 and a resistor R62. The anode of the infrared emission tube LED4 is electrically connected with a power supply VCC, the cathode of the infrared emission tube LED4 is electrically connected with the first end of a resistor R62, and the second end of the resistor R62 is electrically connected with the PC.11 pin of the HT6019 chip of the main control circuit as the TXD _ IR pin of the near infrared circuit. The model of the infrared emission tube LED4 is BIR-SPM1831-LBD, and the resistance value of the resistor R62 is 330 ohms.
The near-infrared circuit of this embodiment realizes checking meter through the butt joint of near-infrared photoelectric head with the near-infrared module on the user's ammeter to and be connected with the host computer communication, realize the data transmission between master control circuit and the host computer, and near-infrared circuit convenient and fast, application scope is wide, and the reliability is high. The upper computer transmits the control instruction to the main control circuit through the communication circuit and reads data of the main control circuit.
The communication circuit of this embodiment comprises near-infrared circuit and loRa, satisfies different communication demands through two kinds of different communication modes.
The power sensor of the present embodiment. Adopt loRa to communicate, can utilize loRa's Mesh (wireless grid network) networking function and other power sensor networks, realize long distance, efficient data and copy and read, and the network deployment is quick, and the consumption is lower. The sampling circuit adopts an open-close type CT, so that the power sensor can be randomly installed at any place of a detection circuit without rewiring, the installation is convenient, the live-line operation can be realized, the normal power consumption of a user is not influenced, the manpower, material resources and financial resources are saved for a user transformation project, and the working efficiency is improved; the open-close type CT with different transformation ratios can be replaced according to the use scene, so that the method is flexible and convenient, and the measurement range is enlarged. The metering chip of the metering circuit can analyze and calculate active power, reactive power, voltage of an output line and current of the output line in the detection line according to sampling data of the sampling circuit, and transmits the calculated data to the main control circuit. The main control chip of the main control circuit calculates electric quantity according to active power and reactive power transmitted by the metering circuit, waveform sampling data of voltage and waveform sampling data of current of the output circuit calculate THD, the data transmitted by the metering circuit, the calculated electric quantity and the THD data are stored, the stored data are transmitted to the upper computer through the communication circuit, and meter reading is convenient. The upper computer can generate graphs of all THDs according to data transmitted by the main control circuit, so that the current power grid quality can be known more intuitively, and damage possibly caused by the power grid quality problem can be solved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A power sensor, comprising: the device comprises a power circuit, a sampling circuit, a metering circuit, a main control circuit and a communication circuit;
the input end of the power circuit is electrically connected with a three-phase alternating current power supply, and the output end of the power circuit is electrically connected with a power supply port of the main control circuit;
the input end of the sampling circuit is electrically connected with the three-phase alternating-current power supply, and the output end of the sampling circuit is electrically connected with the sampling end of the metering circuit;
the output end of the metering circuit is electrically connected with the data end of the main control circuit;
the communication circuit comprises a long-distance radio; the communication circuit is used for carrying out information interaction with the communication circuit of any one of the power sensors;
the communication end of the long-distance radio is electrically connected with the communication end of the main control circuit; the long-range radio is used for communicating with the long-range radio of any one of the power sensors.
2. The power sensor of claim 1, wherein the power circuit comprises: the high-voltage protection device, the non-isolated AC/DC conversion chip and the voltage-stabilizing tube;
the number of the high-voltage protection devices is 3, the input end of each group of the high-voltage protection devices is correspondingly connected with one phase of electricity of the three-phase alternating-current power supply, and the output end of each group of the high-voltage protection devices is electrically connected with the input end of the non-isolated alternating-current and direct-current conversion chip;
the output end of the non-isolated AC-DC conversion chip is electrically connected with the input end of the voltage stabilizing tube;
and the output end of the voltage-stabilizing tube is electrically connected with a power supply port of the main control circuit.
3. The power sensor of claim 2, wherein the power circuit further comprises: a synchronous voltage reduction chip;
the input end of the synchronous voltage reduction chip is electrically connected with the output end of the non-isolated alternating current-direct current conversion chip, and the output end of the synchronous voltage reduction chip is electrically connected with the power supply port of the master control circuit.
4. The power sensor of claim 3, wherein the high voltage protection device comprises: a first voltage dependent resistor, a second voltage dependent resistor and a thermistor;
the first end of the first piezoresistor and the first end of the thermistor are electrically connected with one phase of the three-phase alternating-current power supply;
the second end of the thermistor is electrically connected with the first end of the second piezoresistor and the input end of the non-isolated AC-DC conversion chip;
the second end of the first piezoresistor and the second end of the second piezoresistor are grounded.
5. The power sensor of claim 1, wherein the sampling circuit comprises: a current sampling circuit and a voltage sampling circuit;
the current sampling circuit includes: the current transformer comprises a first open-close type current transformer, a second open-close type current transformer, a third open-close type current transformer and a fourth open-close type current transformer;
the input end of the first open-close type current transformer is electrically connected with the phase A of the three-phase alternating current power supply, and the output end of the first open-close type current transformer is electrically connected with the first current sampling end of the metering circuit;
the input end of the second open-close type current transformer is electrically connected with the phase B of the three-phase alternating current power supply, and the output end of the second open-close type current transformer is electrically connected with the second current sampling end of the metering circuit;
the input end of the third open-close type current transformer is electrically connected with the C phase of the three-phase alternating current power supply, and the output end of the third open-close type current transformer is electrically connected with the third current sampling end of the metering circuit;
the input end of the fourth combined current transformer is electrically connected with the N phase of the three-phase alternating current power supply, and the output end of the fourth combined current transformer is electrically connected with the fourth current sampling end of the metering circuit;
the voltage sampling circuit includes: the sampling circuit comprises an A-phase sampling sub-circuit, a B-phase sampling sub-circuit and a C-phase sampling sub-circuit;
the input end of the A-phase sampling sub-circuit is electrically connected with the A phase of the three-phase alternating-current power supply, and the output end of the A-phase sampling sub-circuit is electrically connected with the first voltage sampling end of the metering circuit;
the input end of the B-phase sampling sub-circuit is electrically connected with a B phase of the three-phase alternating-current power supply, and the output end of the B-phase sampling sub-circuit is electrically connected with a second voltage sampling end of the metering circuit;
the input end of the C-phase sampling sub-circuit is electrically connected with the C phase of the three-phase alternating-current power supply, and the output end of the C-phase sampling sub-circuit is electrically connected with the third voltage sampling end of the metering circuit.
6. The power sensor of claim 1, wherein the main control circuit employs a HT6019 chip, a HT6015 chip, a HT5017 chip, or a HT6025 chip.
7. The power sensor of claim 6, wherein the TXD interface of the long range radio is electrically connected with a PE.2 pin of the master control circuit;
and the RXD interface of the long-distance radio is electrically connected with a PE.1 pin of the main control circuit.
8. The power sensor of claim 6, wherein the communication circuit further comprises: a near-infrared circuit;
the RXD _ IR pin of the near infrared circuit is electrically connected with the PC.12 pin of the main control circuit;
and a TXD _ IR pin of the near infrared circuit is electrically connected with a PC.11 pin of the main control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911360116.5A CN110850161A (en) | 2019-12-25 | 2019-12-25 | Power sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911360116.5A CN110850161A (en) | 2019-12-25 | 2019-12-25 | Power sensor |
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| CN110850161A true CN110850161A (en) | 2020-02-28 |
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| CN201911360116.5A Pending CN110850161A (en) | 2019-12-25 | 2019-12-25 | Power sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021175286A1 (en) * | 2020-03-04 | 2021-09-10 | 百富计算机技术（深圳）有限公司 | Key multiplexing circuit and pos machine |
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