CN203350655U - Slave machine structure of control cabinet - Google Patents
Slave machine structure of control cabinet Download PDFInfo
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- CN203350655U CN203350655U CN 201320308819 CN201320308819U CN203350655U CN 203350655 U CN203350655 U CN 203350655U CN 201320308819 CN201320308819 CN 201320308819 CN 201320308819 U CN201320308819 U CN 201320308819U CN 203350655 U CN203350655 U CN 203350655U
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Abstract
The utility model discloses a slave machine structure of a control cabinet. The slave machine structure comprises a voltage transformer, an active full-wave rectification module, an active low-pass filtering module, an analog-to-digital conversion module, a zero-crossing comparison module, a logic gate circuit module, a simulation switch module, an 89C52 one-chip microcomputer module, a control driving module, an communication interface module, a nonvolatile storage module and a watchdog module. The voltage transformer is separately connected with the zero-crossing comparison module and the active full-wave rectification module. The zero-crossing comparison module is connected with the logic gate circuit module. The active full-wave rectification module is connected with the active low-pass filtering module. The active low-pass filtering module is connected with the analog-to-digital conversion module. The logic gate circuit module is connected with the simulation switch module. The simulation switch module and the analog-to-digital conversion module are connected with the 89C52 one-chip microcomputer module. The 89C52 one-chip microcomputer module is separately connected with the control driving module, the communication interface module, the nonvolatile storage module and the watchdog module. The slave machine is characterized by being simple in structure, clear in levels, cheap in connection and convenient to maintain.
Description
Technical field
The utility model relates to the electrical equipment field, especially a kind of slave computer structure of switch board.
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 the apartment management outsourcing, will be changed into and be encouraged the 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 the one chip microcomputer technology, have designed full-automatic electric weight and have measured the switch board of rationing the power supply, and have realized the centralized control and management of apartment electricity.
Summary of the invention
The purpose of this utility model is the slave computer structure that proposes a kind of switch board, and it has simple in structure, and level understands, connects the characteristics such as cheap, easy to maintenance.
The technical scheme that the utility model solves its technical matters employing is: slave computer comprises voltage transformer (VT), 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; The voltage transformer (VT) module is connected with active full-wave rectification block with the zero passage comparison module respectively, the zero passage comparison module is connected with the logic gates module, active full-wave rectification block is connected with the active low-pass filter module, the active low-pass filter module is connected with analog-to-digital conversion module, the logic gates module is connected with the analog switch module, analog switch module, analog-to-digital conversion module are connected with the 89C52 one-chip computer module, and the 89C52 one-chip computer module is connected with control driver module, communication interface module, non-volatile memory module, watchdog module respectively.
The beneficial effects of the utility model are: have simple in structure, accurate measurement is reliable, stable, maintenance is little, cost performance ratio, is convenient to realize decentralised control and the centralized management of apartment electricity management.
The accompanying drawing explanation
Fig. 1 the utility model connection diagram;
Fig. 2 is active small-signal rectification circuit;
Fig. 3 is active low-pass filter circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail: as shown in Figure 1, slave computer comprises voltage transformer (VT), 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; The voltage transformer (VT) module is connected with active full-wave rectification block with the zero passage comparison module respectively, the zero passage comparison module is connected with the logic gates module, active full-wave rectification block is connected with the active low-pass filter module, the active low-pass filter module is connected with analog-to-digital conversion module, the logic gates module is connected with the analog switch module, analog switch module, analog-to-digital conversion module are connected with the 89C52 one-chip computer module, and the 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 the independent complete 10 road electric currents of each slave computer, voltage and power factor signal and power calculation, electric weight accumulation task, and according to power calculation result and electric weight accumulation results, 10 tunnel supply lines are controlled separately, result of calculation is stored in nonvolatile memory simultaneously, for host computer, carrying out exchanges data.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.Adopt the R4S58 serial bus communication standard of balance transmission between switch board upper and lower machine and 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 can be implemented to control to maximum 230 supply lines by the criminal's of being with platform slave computer at most according to actual needs.
Current signal by electric current and voltage transformer (VT) output is converted to voltage signal through sample resistance, through full-wave rectifying circuit, by the ac voltage signal rectification, is the pulsating direct current signal.For overcoming conventional diode rectifier circuit threshold voltage loss, adopted the active small-signal rectification circuit formed by operational amplifier, pulsating dc voltage signal after overcommutation 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.The 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 are for carrying out current sample to 10 supply lines.Power-factor measurement adopts the phase place comparison expression, electric current, the voltage signal of mutual inductor output is transformed into to the Transistor-Transistor Logic level square wave through zero-crossing comparator, and then, through a Sheffer stroke 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.
Can complete power calculation and carry out the electric weight accumulation according to the electric current recorded, voltage and power factor, the electric weight accumulation results is stored in nonvolatile memory for _ host computer.
Claims (1)
1. the slave computer structure of a switch board, it is characterized in that comprising voltage transformer (VT), 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; The voltage transformer (VT) module is connected with active full-wave rectification block with the zero passage comparison module respectively, the zero passage comparison module is connected with the logic gates module, active full-wave rectification block is connected with the active low-pass filter module, the active low-pass filter module is connected with analog-to-digital conversion module, the logic gates module is connected with the analog switch module, analog switch module, analog-to-digital conversion module are connected with the 89C52 one-chip computer module, and the 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 |
|---|---|---|---|
| CN 201320308819 CN203350655U (en) | 2013-05-31 | 2013-05-31 | Slave machine structure of control cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320308819 CN203350655U (en) | 2013-05-31 | 2013-05-31 | Slave machine structure of control cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203350655U true CN203350655U (en) | 2013-12-18 |
Family
ID=49750532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320308819 Expired - Fee Related CN203350655U (en) | 2013-05-31 | 2013-05-31 | Slave machine structure of control cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203350655U (en) |
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2013
- 2013-05-31 CN CN 201320308819 patent/CN203350655U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20150531 |
|
| EXPY | Termination of patent right or utility model |