CN108650761B - Street lamp power supply and metering module - Google Patents
Street lamp power supply and metering module Download PDFInfo
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- CN108650761B CN108650761B CN201810537130.7A CN201810537130A CN108650761B CN 108650761 B CN108650761 B CN 108650761B CN 201810537130 A CN201810537130 A CN 201810537130A CN 108650761 B CN108650761 B CN 108650761B
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- 238000001514 detection method Methods 0.000 claims abstract description 59
- 238000005265 energy consumption Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 30
- 238000005070 sampling Methods 0.000 claims description 22
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 229910000896 Manganin Inorganic materials 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a street lamp power supply and metering module, which relates to the technical field of street lamp control and comprises a microcontroller unit, a power supply unit, a metering unit, a relay unit and a leakage detection unit; the microcontroller unit is used for controlling the work of the metering unit and communicating with the upper computer; the power supply unit is used for supplying power to the street lamp, the microcontroller unit, the metering unit, the relay unit, the electric leakage detection unit and the upper computer; the metering unit is used for metering the electric energy consumption of the street lamp, the power supply, the metering module and the upper computer; the relay unit is used for controlling the switch of the power supply loop of the street lamp; and the electric leakage detection unit is used for detecting whether the street lamp, other units of the power supply and metering module and the upper computer are in electric leakage. The street lamp power supply and metering module can meter the electric energy of the street lamp, perform electric leakage detection, report the parameters and the states of the street lamp to the upper computer, and receive the instruction of the upper computer to realize intelligent control of the street lamp.
Description
Technical Field
The invention belongs to the technical field of street lamp control, and particularly relates to a street lamp power supply and metering module.
Background
The traditional street lamp control management system can only control the on-off of the street lamp through the upper computer, cannot perform intelligent control, such as implementing remote detection of the power consumption, the electric leakage and the like of the street lamp, and is more and more automatic and intelligent in street lamp management along with the national importance of energy and environmental protection. The electric energy metering of the street lamp illumination and the electric safety of the street lamp are two very necessary aspects. One involving the use of energy and one involving the safety of personnel and equipment.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a street lamp power supply and metering module which can meter the electric energy of a street lamp, perform electric leakage detection, report the parameters and the states of the street lamp to an upper computer, and receive instructions of the upper computer to realize intelligent control of the street lamp.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
The street lamp power supply and metering module comprises a microcontroller unit, a power supply unit, a metering unit, a relay unit and a leakage detection unit, wherein the microcontroller unit is electrically connected with the metering unit, and the microcontroller unit, the relay unit and the leakage detection unit are respectively and electrically connected with an upper computer;
the microcontroller unit is used for controlling the work of the metering unit and communicating with the upper computer;
The power supply unit is used for supplying power to the street lamp, the microcontroller unit, the metering unit, the relay unit, the electric leakage detection unit and the upper computer;
The metering unit is used for metering the electric energy consumption of the street lamp, the power supply and metering module and the upper computer;
The relay unit is used for controlling the switch of the power supply loop of the street lamp;
The electric leakage detection unit is used for detecting whether the street lamp, the microcontroller unit, the metering unit, the relay unit, the power supply unit and the upper computer are in electric leakage.
Preferably, the power supply unit comprises a direct current power supply circuit, wherein the input end of the direct current power supply circuit is respectively and electrically connected with a live wire of the power supply input end and a zero wire of the power supply input end, the direct current power supply circuit provides direct current for the microcontroller unit, the metering unit, the relay unit, the electric leakage detection unit and the upper computer, and the live wire of the power supply input end is electrically connected with the relay unit and is used for providing alternating current for the street lamp.
Preferably, the metering unit comprises a metering chip, and the metering unit is electrically connected with a live wire current sampling circuit and a voltage sampling circuit, wherein the live wire current sampling circuit is used for collecting current on a live wire of the power input end, and the voltage sampling circuit is used for collecting voltage between a live wire of the power input end and a zero wire of the power input end.
Preferably, the live wire current sampling circuit comprises a manganese copper resistor, the live wire at the power input end is respectively and electrically connected with the relay unit and the direct current power circuit after passing through the manganese copper resistor, and two ends of the manganese copper resistor are electrically connected with the metering chip through a first anti-aliasing circuit.
Preferably, the voltage sampling circuit comprises a resistor voltage dividing circuit and a decoupling circuit, and the live wire at the power input end and the zero wire at the power input end are electrically connected with the metering chip through the resistor voltage dividing circuit and the decoupling circuit respectively.
Preferably, the leakage detection unit comprises a current transformer for collecting leakage current and a detection circuit for outputting leakage signals, the current transformer is arranged on a power input live wire and a power input zero line, the input end of the detection circuit is electrically connected with one output end of the current transformer, and the detection circuit comprises a single-phase power rectifying circuit, an in-phase amplifying circuit and a comparison circuit.
Preferably, the single-phase power rectification circuit includes an operational amplifier U12B and an operational amplifier U12A, where a resistor R52 and a resistor R58 are connected in series between a forward end and a reverse end of the operational amplifier U12B, an electrical connection point between the resistor R52 and the resistor R58 is electrically connected to the resistor R57, the other end of the resistor R57 is an input end of the detection circuit, a resistor R59 is disposed between the reverse end and an output end of the operational amplifier U12B, the output end of the operational amplifier U12B is grounded through a capacitor C33, a forward end of the operational amplifier U12B is electrically connected to the reverse end of the operational amplifier U12A, a forward end of the operational amplifier U12A is grounded, an output end of the operational amplifier U12A is electrically connected to a positive electrode of a diode D6, and a negative electrode of the diode D6 is electrically connected to the reverse end of the operational amplifier U12A.
Preferably, the in-phase amplifying circuit includes an operational amplifier U11B, where a forward end of the operational amplifier U11B is electrically connected to an output end of the operational amplifier U12B through a resistor R54, and a forward end of the operational amplifier U11B is grounded through a resistor R55 and electrically connected to a reverse end through a resistor R56.
Preferably, the comparison circuit comprises a comparator and a reference voltage circuit, the comparator comprises an operational amplifier U11A, the reverse end of the operational amplifier U11A is electrically connected with the output end of the operational amplifier U11B through a resistor R66, the reverse end of the operational amplifier U11A is also grounded through a capacitor EC7, the output end of the operational amplifier U11A is electrically connected with a resistor R53, and the other end of the resistor R53 is electrically connected with an optocoupler U10; the reference voltage circuit comprises a resistor R63 electrically connected with a direct-current power supply, the other end of the resistor R63 is electrically connected with a resistor R64 and the cathode and the reference electrode of the controllable precise voltage stabilizing source U13 respectively, the other end of the resistor R64 is electrically connected with a resistor R65 and a capacitor C34 respectively, the positive electrode of the controllable precise voltage stabilizing source U13, the other end of the resistor R65 and the other end of the capacitor C34 are grounded, and an electrical connection point of the resistor R64 and the resistor R65 is used as a voltage reference point and is electrically connected with the positive end of the operational amplifier U11A.
Preferably, the two output ends of the current transformer are electrically connected with the metering chip through a voltage reduction circuit and a second anti-aliasing circuit.
After the technical scheme is adopted, the invention has the beneficial effects that:
The street lamp power supply and metering module comprises a microcontroller unit, a power supply unit, a metering unit, a relay unit and a leakage detection unit, wherein the microcontroller unit is electrically connected with the metering unit, and the microcontroller unit, the relay unit and the leakage detection unit are respectively and electrically connected with an upper computer; the microcontroller unit is used for controlling the work of the metering unit and communicating with the upper computer; the power supply unit is used for supplying power to the street lamp, the microcontroller unit, the metering unit, the relay unit, the electric leakage detection unit and the upper computer; the metering unit is used for metering the electric energy consumption of the street lamp, the power supply, the metering module and the upper computer; the relay unit is used for controlling the switch of the power supply loop of the street lamp; and the electric leakage detection unit is used for detecting whether the street lamp, the microcontroller unit, the metering unit, the relay unit, the power supply unit and the upper computer are in electric leakage or not. The whole street lamp power supply and the metering module are controlled by the upper computer, the upper computer is communicated with the street lamp general control center through the communication module, the electric energy consumption information measured by the metering unit is transmitted to the microcontroller unit, the microcontroller unit transmits the electric energy consumption information to the upper computer, the electric leakage detection unit detects whether the street lamp, other units of the street lamp power supply and the metering module and the upper computer are in electric leakage, if the electric leakage exists, the electric leakage detection unit generates an electric leakage signal and transmits the electric leakage signal to the upper computer, the upper computer transmits the electric energy consumption information and the electric leakage signal to the street lamp general control center, the upper computer can control the relay unit to realize the switching of a loop of the street lamp, and the electric leakage detection unit also has the function of adjusting the brightness of the street lamp, so that remote intelligent control is realized.
Because the metering unit includes the metering chip, the metering unit electricity is connected with live wire current sampling circuit and voltage sampling circuit, and live wire current sampling circuit is used for gathering the electric current on the power input end fire line, and voltage sampling circuit is used for gathering the voltage between power input end live wire and the power input end zero line. By collecting the current on the fire wire of the power input end and the voltage between the fire wire of the power input end and the zero wire of the power input end, the electric energy consumption of the street lamp, the power supply, the metering module and the upper computer can be calculated.
The leakage detection unit comprises a current transformer for collecting leakage current and a detection circuit for outputting leakage signals, wherein the current transformer is arranged on a power input live wire and a power input zero wire, the input end of the detection circuit is electrically connected with one output end of the current transformer, the detection circuit comprises a single-phase power rectifying circuit, an in-phase amplifying circuit and a comparison circuit, signals generated on the current transformer are rectified by the single-phase power rectifying circuit through the input end of the detection circuit and amplified by the in-phase amplifying circuit, the amplified signals are compared with reference voltage through the comparison circuit, and if the amplified signals are higher than the reference voltage, the leakage signals are output to the upper computer.
Because the two output ends of the current transformer are electrically connected with the metering chip through the voltage reducing circuit and the second anti-aliasing circuit, the leakage current can be measured through the metering chip.
In conclusion, the street lamp power supply and metering module solves the problem that the traditional street lamp control management system cannot realize intelligent control of electric energy and electric leakage detection. The street lamp power supply and metering module can meter the electric energy of the street lamp, perform electric leakage detection, report the parameters and the states of the street lamp to the upper computer, and receive the instruction of the upper computer to realize intelligent control of the street lamp.
Drawings
FIG. 1 is a block diagram of a street lamp power supply and metering module of the present invention;
FIG. 2 is a schematic circuit diagram of a microcontroller unit;
FIG. 3 is a schematic circuit diagram of a power supply unit;
FIG. 4 is a schematic circuit diagram of a metering unit;
fig. 5 is a circuit schematic of the relay unit;
FIG. 6 is a schematic circuit diagram of the leakage detection unit;
in the figure: the device comprises a 1-microcontroller unit, a 2-power supply unit, a 3-metering unit, a 4-relay unit, a 5-electric leakage detection unit, a 6-upper computer and 7-street lamps.
Detailed Description
The invention is further illustrated in the following, in conjunction with the accompanying drawings and examples.
As shown in fig. 1, the street lamp power supply and metering module comprises a microcontroller unit 1, a power supply unit 2, a metering unit 3, a relay unit 4 and a leakage detection unit 5, wherein the microcontroller unit 1 is electrically connected with the metering unit 2, and the microcontroller unit 1, the relay unit 4 and the leakage detection unit 5 are respectively electrically connected with an upper computer 6;
A microcontroller unit 1 for controlling the operation of the metering unit 3 and communicating with an upper computer 6; the power supply unit 2 is used for supplying power to the street lamp 7, the microcontroller unit 1, the metering unit 3, the relay unit 4, the electric leakage detection unit 5 and the upper computer 6; the metering unit 3 is used for metering the electric energy consumption of the street lamp 7, the power supply and metering module and the upper computer 6; a relay unit 4 for controlling the switching of the power supply loop of the street lamp 7; the electric leakage detection unit 5 is used for detecting whether the street lamp 7, the microcontroller unit 1, the metering unit 3, the relay unit 4, the power supply unit 2 and the upper computer 6 are in electric leakage. The upper computer 7 has the function of controlling the brightness of the street lamp, and can realize remote communication with the street lamp main control center through the communication module.
As shown in fig. 2, the microcontroller unit 1 includes a microcontroller U8 and a memory U9, and the microcontroller U8 forms a 232 serial port through pins P13 and P14 to communicate with an upper computer. The optocouplers U5 and U6 are used for isolation, the memory U9 is used for providing a data storage function, and the socket XP1 is used as a programming port.
As shown in fig. 3, the power supply unit 2 includes a dc power supply circuit, the input end of the dc power supply circuit is electrically connected with the live wire of the power supply input end and the zero wire of the power supply input end, the dc power supply circuit provides dc power for the microcontroller unit 1, the metering unit 3, the relay unit 4, the leakage detection unit 5, and the host computer 6, and the live wire of the power supply input end is electrically connected with the relay unit for providing ac power for the street lamp 7. The direct current power supply circuit comprises a rectifier bridge chip MB6S, 220VAC signals are rectified into pulse signals through the rectifier bridge chip MB6S, the pulse signals are changed into direct current voltage signals through filtering of a capacitor EC1, the switch power supply chip PN8147 controls on-off of the circuit to form pulse signals with certain frequency, the pulse signals are converted into two paths of pulse signals through a transformer T1, the pulse signals are respectively rectified through diodes D3 and D5, the pulse signals are changed into 12V direct current voltage and 8V direct current voltage through filtering of capacitors EC3 and EC4, and the 8V direct current voltage is changed into 5V direct current voltage signals through a voltage stabilizing module U4. Optocoupler PC817 and surrounding circuitry are voltage feedback circuits that act as voltage regulators.
As shown in fig. 4, the metering unit 3 includes a metering chip U7, and the metering unit is electrically connected with a live wire current sampling circuit and a voltage sampling circuit, where the live wire current sampling circuit is used to collect current on a live wire of a power input end, the voltage sampling circuit is used to collect voltage between the live wire of the power input end and a zero wire of the power input end, and by collecting current on the live wire of the power input end and voltage between the live wire of the power input end and the zero wire of the power input end, the power consumption of the street lamp 7, the power supply, the metering module and the upper computer 6 can be calculated. In this embodiment, preferably, the live wire current sampling circuit includes a manganin resistor, and the live wire at the power input end is electrically connected with the relay unit and the dc power supply circuit respectively after passing through the manganin resistor, and two ends of the manganin resistor are electrically connected with the metering chip U7 through the first anti-aliasing circuit. The first anti-aliasing circuit comprises a resistor R7, a resistor R10, a capacitor C1 and a capacitor C4, wherein one end of a manganese copper resistor M1 is grounded through the resistor R7 and the capacitor C1 which are connected in series in sequence, the other end of the manganese copper resistor M1 is grounded through the resistor R10 and the capacitor C4 which are connected in series in sequence, an electric connection point of the resistor R7 and the capacitor C1 is electrically connected with the 5 pin of the metering chip U7, and an electric connection point of the resistor R10 and the capacitor C4 is electrically connected with the 6 pin of the metering chip U7. In this embodiment, it is further preferable that the voltage sampling circuit includes a resistor voltage dividing circuit and a decoupling circuit, and the power supply input terminal live wire and the power supply input terminal zero wire are electrically connected to the metering chip through the resistor voltage dividing circuit and the decoupling circuit, respectively. The resistor divider circuit comprises a resistor R6 and a resistor R8, wherein a zero line at the power input end is electrically connected with the resistor R6, the other end of the resistor R6 is electrically connected with the resistor R8, the other end of the resistor R8 is grounded, and the electrical connection point of the resistor R6 and the resistor R8 is electrically connected with 9 pins of the metering chip U7. The decoupling circuit comprises a resistor R8, a resistor R9, a capacitor C2 and a capacitor C3, wherein the capacitor C2 is connected in parallel with two ends of the resistor R8, and a10 pin of the metering chip U7 is grounded through the resistor R9 and the capacitor C2 which are connected in parallel.
As shown in fig. 5, the relay unit 4 includes a relay and a relay control circuit, the relay control circuit includes a triode Q4, a base electrode of the triode Q4 is electrically connected with a resistor R16, the resistor R16 is electrically connected with an upper computer through a socket J1, a collector electrode of the triode Q4 is electrically connected with a direct current power supply through the relay, an emitter electrode of the triode Q4 is grounded, and a reverse diode D4 is connected in parallel on the relay. The upper computer controls signals to the triode Q4 through the socket J1, and the relay can be controlled to connect or disconnect the power supply input end live wire with the power supply live wire of the street lamp 7 by utilizing the switching action of the triode Q4 so as to realize the switching of the power supply loop of the street lamp 7.
As shown in fig. 2 and 6 together, the leakage detection unit 5 includes a current transformer CT for collecting leakage current and a detection circuit for outputting leakage signals, the current transformer CT is disposed on a power input live wire and a power input zero wire, an input end of the detection circuit is electrically connected with an output end of the current transformer CT, the detection circuit includes a single-phase power rectifying circuit, an in-phase amplifying circuit, and a comparing circuit, a signal generated on the current transformer CT is rectified by the single-phase power rectifying circuit through the input end of the detection circuit, amplified by the in-phase amplifying circuit, the amplified signal is compared with a reference voltage through the comparing circuit, if the amplified signal is higher than the reference voltage, then output the leakage signal to the upper computer. The single-phase power rectification circuit comprises an operational amplifier U12B and an operational amplifier U12A, wherein a resistor R52 and a resistor R58 are connected in series between the forward end and the reverse end of the operational amplifier U12B, the electric connection point of the resistor R52 and the resistor R58 is electrically connected with a resistor R57, the other end of the resistor R57 is the input end of the detection circuit, a resistor R59 is arranged between the reverse end and the output end of the operational amplifier U12B, the output end of the operational amplifier U12B is grounded through a capacitor C33, the forward end of the operational amplifier U12B is electrically connected with the reverse end of the operational amplifier U12A, the forward end of the operational amplifier U12A is grounded, the output terminal of the operational amplifier U12A is electrically connected to the positive electrode of the diode D6, and the negative electrode of the diode D6 is electrically connected to the reverse terminal of the operational amplifier U12A. The in-phase amplifying circuit comprises an operational amplifier U11B, wherein the forward end of the operational amplifier U11B is electrically connected with the output end of the operational amplifier U12B through a resistor R54, and the forward end of the operational amplifier U11B is grounded through a resistor R55 and is electrically connected with the reverse end through a resistor R56. The comparison circuit comprises a comparator and a reference voltage circuit, the comparator comprises an operational amplifier U11A, the reverse end of the operational amplifier U11A is electrically connected with the output end of the operational amplifier U11B through a resistor R66, the reverse end of the operational amplifier U11A is also grounded through a capacitor EC7, the output end of the operational amplifier U11A is electrically connected with a resistor R53, and the other end of the resistor R53 is electrically connected with an optocoupler U10; the reference voltage circuit comprises a resistor R63 electrically connected with a direct-current power supply, the other end of the resistor R63 is electrically connected with a resistor R64 and the cathode and the reference electrode of the controllable precise voltage stabilizing source U13 respectively, the other end of the resistor R64 is electrically connected with a resistor R65 and a capacitor C34 respectively, the positive electrode of the controllable precise voltage stabilizing source U13, the other end of the resistor R65 and the other end of the capacitor C34 are grounded, and the electric connection point of the resistor R64 and the resistor R65 is used as a voltage reference point and is electrically connected with the positive end of the operational amplifier U11A. If the reference voltage is exceeded, the output of U11A goes low and the 4 pin of optocoupler U10 goes low. When the electric leakage detection unit works, if no electric leakage occurs at ordinary times, the signal generated by the current transformer CT is very small, the output signal of the operational amplifier U11B is very small, the output of the operational amplifier U11A is high level, the 4 pin of the optical coupler U10 is in a suspended state, when electric leakage occurs, the signal generated by the current transformer CT is large, the output signal of the operational amplifier U11B is large, the output of the operational amplifier U11A is low level, the 4 pin of the optical coupler U10 is low level, and the signal is transmitted to an upper computer through the socket J1.
As shown in fig. 2, fig. 4 and fig. 6 together, in this embodiment, two output ends of the current transformer CT are electrically connected to the metering chip U7 through the step-down circuit and the second anti-aliasing circuit, so that the leakage current can be accurately measured by the metering chip. In this embodiment, the step-down circuit includes a resistor R50 and a resistor R51, the second anti-aliasing circuit includes a resistor R48, a resistor R49, a capacitor C30, and a capacitor C31, one end of the current transformer CT is electrically connected to the resistor R50 and the resistor R48, the other end of the resistor R50 is grounded, the other end of the resistor R48 is electrically connected to the pin 7 of the metering chip U7 and the capacitor C30, and the other end of the capacitor C30 is grounded. The other end of the current transformer CT is respectively and electrically connected with a resistor R51 and a resistor R49, the other end of the resistor R51 is grounded, the other end of the resistor R49 is respectively and electrically connected with the 8 pin of the metering chip U7 and a capacitor C31, and the other end of the capacitor C31 is grounded.
The specific working mode of the street lamp power supply and the metering module is as follows:
As shown in fig. 1 and fig. 2 together, the whole street lamp power supply and the metering module are controlled by the upper computer 6, the upper computer 6 communicates with the street lamp overall control center through the communication module, the electric energy consumption information measured by the metering unit 3 is transmitted to the micro-controller unit 1, the micro-controller unit 1 transmits the electric energy consumption information to the upper computer 6, the electric leakage detection unit detects whether the street lamp, other units of the street lamp power supply and the metering module and the upper computer leak electricity, if the electric leakage exists, the electric leakage detection unit 5 generates an electric leakage signal and transmits the electric leakage signal to the upper computer 6, the upper computer 6 transmits the electric energy consumption information and the electric leakage signal to the street lamp overall control center, the upper computer 6 can control the relay unit 4 to realize the switch of a loop of the street lamp 7, and also has the function of adjusting the brightness of the street lamp 7, so that the remote intelligent control is realized. The street lamp power supply and metering module can meter the electric energy of the street lamp 7, perform electric leakage detection, report the parameters and the states of the street lamp to the upper computer, and receive the instruction of the upper computer to realize intelligent control of the street lamp.
The present invention is not limited to the above-described specific embodiments, and various modifications may be made by those skilled in the art without inventive effort from the above-described concepts, and are within the scope of the present invention.
Claims (7)
1. The street lamp power supply and metering module is characterized by comprising a microcontroller unit, a power supply unit, a metering unit, a relay unit and a leakage detection unit, wherein the microcontroller unit is electrically connected with the metering unit, and the microcontroller unit, the relay unit and the leakage detection unit are respectively and electrically connected with an upper computer;
the microcontroller unit is used for controlling the work of the metering unit and communicating with the upper computer;
The power supply unit is used for supplying power to the street lamp, the microcontroller unit, the metering unit, the relay unit, the electric leakage detection unit and the upper computer;
The metering unit is used for metering the electric energy consumption of the street lamp, the power supply and metering module and the upper computer;
The relay unit is used for controlling the switch of the power supply loop of the street lamp;
The electric leakage detection unit is used for detecting whether the street lamp, the microcontroller unit, the metering unit, the relay unit, the power supply unit and the upper computer are in electric leakage or not;
The leakage detection unit comprises a current transformer for collecting leakage current and a detection circuit for outputting leakage signals, the current transformer is arranged on a power input live wire and a power input zero wire, the input end of the detection circuit is electrically connected with one output end of the current transformer, and the detection circuit comprises a single-phase power rectifying circuit, an in-phase amplifying circuit and a comparison circuit; the signal generated on the current transformer passes through the single-phase power supply rectifying circuit through the input end of the detection circuit, and is amplified by the in-phase amplifying circuit, the amplified signal is compared with the reference voltage through the comparison circuit, and if the amplified signal is higher than the reference voltage, a leakage signal is output to the upper computer;
The in-phase amplifying circuit comprises an operational amplifier U11B, wherein the forward end of the operational amplifier U11B is electrically connected with the output end of the operational amplifier U12B through a resistor R54, and the forward end of the operational amplifier U11B is grounded through a resistor R55 and is electrically connected with the reverse end through a resistor R56;
The comparison circuit comprises a comparator and a reference voltage circuit, wherein the comparator comprises an operational amplifier U11A, the reverse end of the operational amplifier U11A is electrically connected with the output end of the operational amplifier U11B through a resistor R66, the reverse end of the operational amplifier U11A is also grounded through a capacitor EC7, the output end of the operational amplifier U11A is electrically connected with a resistor R53, and the other end of the resistor R53 is electrically connected with an optocoupler U10; the reference voltage circuit comprises a resistor R63 electrically connected with a direct-current power supply, the other end of the resistor R63 is electrically connected with a resistor R64 and the cathode and the reference electrode of a controllable precise voltage stabilizing source U13 respectively, the other end of the resistor R64 is electrically connected with a resistor R65 and a capacitor C34 respectively, the anode of the controllable precise voltage stabilizing source U13, the other end of the resistor R65 and the other end of the capacitor C34 are grounded, and an electrical connection point of the resistor R64 and the resistor R65 is used as a voltage reference point and is electrically connected with the positive end of an operational amplifier U11A;
If the reference voltage is exceeded, the output of the U11A is low, the 4 pin of the optical coupler U10 is low, when the electric leakage detection unit works, if no electric leakage exists at ordinary times, the signal generated by the current transformer is very small, the output signal of the operational amplifier U11B is very small, the output of the operational amplifier U11A is high, the 4 pin of the optical coupler U10 is in a suspended state, when electric leakage occurs, the signal generated by the current transformer is large, the output signal of the operational amplifier U11B is large, the output of the operational amplifier U11A is low, the 4 pin of the optical coupler U10 is low, and the signal is transmitted to an upper computer through a socket;
The metering unit comprises a metering chip, two output ends of the current transformer are electrically connected with the metering chip U7 through a voltage reduction circuit and a second anti-aliasing circuit, and leakage current is accurately measured through the metering chip.
2. The street lamp power supply and metering module according to claim 1, wherein the power supply unit comprises a direct current power supply circuit, the input end of the direct current power supply circuit is electrically connected with a power supply input end live wire and a power supply input end zero wire respectively, the direct current power supply circuit provides direct current for the microcontroller unit, the metering unit, the relay unit, the electric leakage detection unit and the upper computer, and the power supply input end live wire is electrically connected with the relay unit and is used for providing alternating current for the street lamp.
3. The street lamp power supply and metering module according to claim 2, wherein the metering unit is electrically connected with a live current sampling circuit and a voltage sampling circuit, the live current sampling circuit is used for collecting current on the live wire of the power input end, and the voltage sampling circuit is used for collecting voltage between the live wire of the power input end and the zero wire of the power input end.
4. The street lamp power supply and metering module according to claim 3, wherein the live wire current sampling circuit comprises a manganese-copper resistor, the live wire at the power supply input end is respectively and electrically connected with the relay unit and the direct current power supply circuit after passing through the manganese-copper resistor, and two ends of the manganese-copper resistor are electrically connected with the metering chip through a first anti-aliasing circuit.
5. The street lamp power and metering module of claim 4, wherein the voltage sampling circuit comprises a resistor divider circuit and a decoupling circuit, and the power input live wire and the power input zero wire are electrically connected with the metering chip through the resistor divider circuit and the decoupling circuit respectively.
6. The street lamp power supply and metering module according to any one of claims 3 to 5, wherein the single-phase power supply rectifying circuit comprises an operational amplifier U12B and an operational amplifier U12A, a resistor R52 and a resistor R58 are connected in series between a forward end and a reverse end of the operational amplifier U12B, an electrical connection point between the resistor R52 and the resistor R58 is electrically connected with the resistor R57, the other end of the resistor R57 is an input end of the detection circuit, a resistor R59 is provided between the reverse end and an output end of the operational amplifier U12B, the output end of the operational amplifier U12B is grounded through a capacitor C33, the forward end of the operational amplifier U12B is electrically connected with the reverse end of the operational amplifier U12A, the forward end of the operational amplifier U12A is grounded, the output end of the operational amplifier U12A is electrically connected with the positive electrode of a diode D6, and the negative electrode of the diode D6 is electrically connected with the reverse end of the operational amplifier U12A.
7. The street lamp power supply and metering module of claim 1, wherein two output ends of the current transformer are electrically connected with the metering chip through a voltage reduction circuit and a second anti-aliasing circuit.
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| CN109831851A (en) * | 2019-03-28 | 2019-05-31 | 四川艾贝斯科技发展有限公司 | A kind of street lamp single-lamp control system and control method |
| CN112153789A (en) * | 2020-09-26 | 2020-12-29 | 广东南控云图科技有限公司 | Adjustable street lamp management system and control method thereof |
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