CN103532228A - Electric quantity metering electricity limiting control cabinet - Google Patents
Electric quantity metering electricity limiting control cabinet Download PDFInfo
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- CN103532228A CN103532228A CN201310211516.6A CN201310211516A CN103532228A CN 103532228 A CN103532228 A CN 103532228A CN 201310211516 A CN201310211516 A CN 201310211516A CN 103532228 A CN103532228 A CN 103532228A
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Abstract
The invention discloses an electric quantity metering electricity limiting control cabinet comprising a control module, a data acquisition processing module, a lower computer and an upper computer. The control module and the data acquisition processing module are connected with the lower computer. The lower computer is connected and communicated with the upper computer. The upper computer and the lower computer adopt an RS485 serial bus communication standard with balanced transmission. The full-automatic electric quantity metering electricity limiting control cabinet composed of a single-chip microcomputer has advantages of being simple in structure, precise and reliable in metering, stable in operation, low in maintenance amount, high in cost performance ratio, etc. so that realization of decentralized control and centralized management of apartment-used electricity management are facilitated.
Description
Technical field
The present invention relates to electric equipment field, especially a kind of full-automatic electric weight measures the control cubicle of rationing the power supply.
Background technology
Along with the adjustment of China Higher educational structure, outsource college services to independent service providers has become the inexorable trend of Higher Education Development.Student dormitory generally adopted margining electric method in the past, after apartment management outsourcing, will be changed into and be encouraged safety of student electricity consumption by restriction student electricity consumption, adopted restriction firm power, restriction basic charge as per installed capacity, the form of excess charge.In order to strengthen the management of power use, we adopt one chip microcomputer technology, have designed full-automatic electric weight and have measured the control cubicle of rationing the power supply, and have realized the centralized control and management of apartment electricity.
Summary of the invention
In order to strengthen the management of power use, the present invention proposes a kind of electric quantity metering control cubicle of rationing the power supply, adopt one chip microcomputer technology, designed the full-automatic electric weight metering control cubicle of rationing the power supply, realized the centralized control and management of apartment electricity.
The technical scheme that the present invention solves its technical problem employing is: control cubicle comprises control module, digital sampling and processing, slave computer, host computer; Control module, digital sampling and processing are connected with slave computer, and slave computer is connected communication with host computer, and host computer, slave computer adopt the RS485 serial bus communication standard of balance transmission.
Described host computer comprises control unit, display keyboard, print unit, memory cell, clock unit.
Described slave computer comprises voltage transformer, active full-wave rectification block, active low-pass filter module, analog-to-digital conversion module, zero passage comparison module, logic gates module, analog switch module, 89C52 one-chip computer module, control driver module, communication interface module, non-volatile memory module, watchdog module; Voltage transformer module is connected with active full-wave rectification block with zero passage comparison module respectively, zero passage comparison module is connected with logic gates module, active full-wave rectification block is connected with active low-pass filter module, active low-pass filter module is connected with analog-to-digital conversion module, logic gates module is connected with analog switch module, analog switch module, analog-to-digital conversion module are connected with 89C52 one-chip computer module, and 89C52 one-chip computer module is connected with control driver module, communication interface module, non-volatile memory module, watchdog module respectively.
The invention has the beneficial effects as follows: the full-automatic electric weight metering being formed by single-chip microcomputer ration the power supply control cubicle have simple in structure, accurate measurement is reliable, stable, maintenance is little, cost performance ratio, is convenient to realize decentralized control and the centralized management of apartment electricity management.
Accompanying drawing explanation
Fig. 1 is the connection diagram of structure of the present invention;
Fig. 2 is the structured flowchart of slave computer;
Fig. 3 is active small-signal rectification circuit;
Fig. 4 is active low-pass filter circuit.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described: as shown in Figure 1, control cubicle comprises control module, digital sampling and processing, slave computer, host computer; Control module, digital sampling and processing are connected with slave computer, and slave computer is connected communication with host computer, and host computer, slave computer adopt the RS485 serial bus communication standard of balance transmission.Host computer comprises control unit, display keyboard, print unit, memory cell, clock unit.
Slave computer comprises voltage transformer, active full-wave rectification block, active low-pass filter module, analog-to-digital conversion module, zero passage comparison module, logic gates module, analog switch module, 89C52 one-chip computer module, control driver module, communication interface module, non-volatile memory module, watchdog module; Voltage transformer module is connected with active full-wave rectification block with zero passage comparison module respectively, zero passage comparison module is connected with logic gates module, active full-wave rectification block is connected with active low-pass filter module, active low-pass filter module is connected with analog-to-digital conversion module, logic gates module is connected with analog switch module, analog switch module, analog-to-digital conversion module are connected with 89C52 one-chip computer module, and 89C52 one-chip computer module is connected with control driver module, communication interface module, non-volatile memory module, watchdog module respectively.
During work, the data acquisition of each slave computer independence Wan10 road electric current, voltage and power factor signal and power calculation, electric weight accumulation task, and according to power calculation result and electric weight accumulation results, Dui10 road supply line controls separately, result of calculation is stored in nonvolatile storage simultaneously, for carrying out exchanges data with host computer.Host computer carries out integrated management to each slave computer, and bears demonstration, keyboard, the man-machine interface task such as prints, arranges, and host computer can also be transferred to data in the management end of apartment, distant place administrative center by microcomputer interface simultaneously.Between control cubicle upper and lower machine and adopt the R4S58 serial bus communication standard of balance transmission between the supervisory computer of host computer and apartment administrative center, communication distance is far away, and antijamming capability is strong, can realize the electricity consumption integrated management in a plurality of apartments.Every host computer at most can the criminal's of being with platform slave computer be implemented to control to maximum 230Tiao supply line according to actual needs.
Current signal by electric current and voltage transformer output is converted to voltage signal through sample resistance, through full-wave rectifying circuit, by ac voltage signal rectification, is pulsating direct current signal.For overcoming conventional diode rectifier circuit threshold voltage loss, adopted the active small-signal rectification circuit being formed by operational amplifier, pulsating dc voltage signal after over commutation passes through active low-pass filter again, obtains the effective value of the electric current that is directly proportional to supply line's electric current and voltage and voltage for A/D converter.Active rectification and active low-pass filter circuit are as shown in Figure 3 and Figure 4.A/D conversion adopts 10 11 channel serial analog to digital converter TL-IC453, and wherein 10 passages are for fixing voltage sample, and other 10 passages carry out current sample for Dui10Tiao supply line.Power-factor measurement adopts phase place comparison expression, electric current, the voltage signal of instrument transformer output is transformed into Transistor-Transistor Logic level square wave through zero-crossing comparator, and then through a NAND gate, obtains phase signal, and defeated people is to the middle fracture of AT89C15.
The time T that the phase difference of UI allows
φ=10ms-T
o, due to
, therefore
as long as, the time of measuring To, obtain To, then calculate φ by above formula,
In cos φ, also can obtain thereupon.
16 bit timing devices of AT89C51 inside are when the crystal oscillator of 12MHz, and every 1 μ s adds 1, therefore can be used for measuring the time of T.If the corresponding angle φ ' of timer 1 LSB angle
, i.e. φ '=0.0018 °.So, as long as obtain T
φ=10000-T(T is the count value that timer is read), then be multiplied by 0.0018 °, be the actual phase angle of φ.Call again the mathematics COS function of C language, can obtain power factor value.
According to the electric current recording, voltage and power factor, can complete power calculation and carry out electric weight accumulation, electric weight accumulation results is stored in nonvolatile memory for _ host computer.
Claims (3)
1. the electric quantity metering control cubicle of rationing the power supply, is characterized in that comprising that control cubicle comprises control module, digital sampling and processing, slave computer, host computer; Control module, digital sampling and processing are connected with slave computer, and slave computer is connected communication with host computer, and host computer, slave computer adopt the RS485 serial bus communication standard of balance transmission.
2. a kind of electric quantity metering according to claim 1 control cubicle of rationing the power supply, is characterized in that host computer comprises control unit, display keyboard, print unit, memory cell, clock unit.
3. a kind of electric quantity metering according to claim 1 control cubicle of rationing the power supply, it is characterized in that slave computer comprises voltage transformer, active full-wave rectification block, active low-pass filter module, analog-to-digital conversion module, zero passage comparison module, logic gates module, analog switch module, 89C52 one-chip computer module, control driver module, communication interface module, non-volatile memory module, watchdog module; Voltage transformer module is connected with active full-wave rectification block with zero passage comparison module respectively, zero passage comparison module is connected with logic gates module, active full-wave rectification block is connected with active low-pass filter module, active low-pass filter module is connected with analog-to-digital conversion module, logic gates module is connected with analog switch module, analog switch module, analog-to-digital conversion module are connected with 89C52 one-chip computer module, and 89C52 one-chip computer module is connected with control driver module, communication interface module, non-volatile memory module, watchdog module respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310211516.6A CN103532228A (en) | 2013-05-31 | 2013-05-31 | Electric quantity metering electricity limiting control cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310211516.6A CN103532228A (en) | 2013-05-31 | 2013-05-31 | Electric quantity metering electricity limiting control cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103532228A true CN103532228A (en) | 2014-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310211516.6A Pending CN103532228A (en) | 2013-05-31 | 2013-05-31 | Electric quantity metering electricity limiting control cabinet |
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|---|---|
| CN (1) | CN103532228A (en) |
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2013
- 2013-05-31 CN CN201310211516.6A patent/CN103532228A/en active Pending
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140122 |