CN103607162A - On-line switching device of frequency conversion and power frequency - Google Patents
On-line switching device of frequency conversion and power frequency Download PDFInfo
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- CN103607162A CN103607162A CN201310667989.7A CN201310667989A CN103607162A CN 103607162 A CN103607162 A CN 103607162A CN 201310667989 A CN201310667989 A CN 201310667989A CN 103607162 A CN103607162 A CN 103607162A
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Abstract
The invention relates an on-line switching device of frequency conversion and power frequency. The on-line switching device comprises a power supply module, a processing module, an EEPROM (Electrically Erasable Programmable Read-Only Memory), an output module, a signal acquisition module, a switching signal input circuit and a display module, wherein the processing module comprises a CPU (Central Processing Unit) and two RS485 (Recommended Standard 485) communication circuits which are respectively electrically connected with the CPU; the signal acquisition module comprises four signal acquisition circuits which are all connected with the CPU; the switching signal input circuit and the EEPROM are respectively electrically connected with the CPU; the output module comprises two relay output modules which are connected with the CPU; the display module comprises a display circuit and a display screen; the power supply module is provided with three 5V electricity supplies for the complete device. According to the invention, by virtue of real-time collection of frequency conversion signals and control based on the CPU and PLC (Programmable Logic Controller), low-voltage start and soft switching of the frequency conversion state of a transducer are realized.
Description
Technical field
The present invention relates to a kind of switch, relate in particular to the online switching device shifter of a kind of frequency conversion power frequency.
Background technology
When motor is converted to power frequency state from frequency conversion state, mostly adopt directly and switch, during due to frequency conversion state, the output waveform phase place of frequency converter is not identical with the phase place between industrial-frequency alternating current, can cause very large moment impact electric current, power supply grid, power supply unit, motor are all had a great impact, although also there is on the market at present switch controller, these switch controllers only can be realized state and switch, and can not realize special tracking and control to a certain frequency converter.
Summary of the invention
For solving above-mentioned defect of the prior art, the invention provides the online switching device shifter of frequency conversion power frequency, solve the problem that produces impulse current in handoff procedure, and can realize demonstration and control to frequency converter frequency conversion state.
For solving the problems of the technologies described above, the present invention program comprises: the online switching device shifter of frequency conversion power frequency, it is characterized in that, comprise power module, processing module, EEPROM, output module, signal acquisition module, switching signal input circuit, display module, described processing module comprises central processing unit and communication module, described communication module comprises two-way RS485 telecommunication circuit, and described two-way RS485 telecommunication circuit is electrically connected to respectively on central processing unit; Described signal acquisition module comprises 4 road signal acquisition circuits, and 4 described road signal acquisition circuits are connected respectively on central processing unit; Described switching signal input circuit and EEPROM are electrically connected to respectively on central processing unit; Described output module comprises two-way relay output module, and described two-way relay output module is electrically connected to respectively on central processing unit; Described display module comprises display circuit and display screen, and described display circuit connects respectively central processing unit and display screen; Described power module provides 3 road 5V supplies of electric power for whole device.
Further, described display screen adopts the TFT liquid crystal display of 3.2 cun.
Further, described central processing unit adopts 32 ARM chip STM32F103.
Further, described power module comprises transformer T, current rectifying and wave filtering circuit, RCD circuit, feedback radiating circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit, the input of described current rectifying and wave filtering circuit is connected in 220V AC power by choking-winding, the output of current rectifying and wave filtering circuit is connected with the input of RCD circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit is connected with the output of RCD circuit by transformer respectively with tertiary voltage output circuit, the input of described feedback radiating circuit is connected with the first voltage follower circuit, the output of feedback radiating circuit is connected with feedback receiving circuit, feedback receiving circuit is connected with the output of current rectifying and wave filtering circuit by power-supply controller of electric.
Further, described signal acquisition circuit comprises resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, resistance R 24, capacitor C 18, capacitor C 19, capacitor C 20, capacitor C 21, capacitor C 22, capacitor C 23, capacitor C 24, triode Q1, diode D7, diode D8, diode D9, diode D10, diode D11, diode D12, optocoupler U2, Schmidt trigger CD4093, one end of R16 connects first input end, the other end of R16 connects the positive pole of D7, one end of R17 connects the second input, the other end of R17 connects the negative pole of D8, the positive pole of D9 connects D7 negative pole, the negative pole of D9 connects the negative pole of D10, the positive pole of D10 connects respectively D11 positive pole and D12 positive pole, the negative pole of D11 connects Q1 base stage, D12 negative pole connects Q1 emitter, the two ends of C18 connect respectively D7 positive pole and D8 negative pole, the two ends of C19 connect respectively D7 negative pole and D8 is anodal, C20 and C21 are in parallel with D10 respectively, one end of C22 connects Q1 base stage, it is anodal that the C22 other end connects D11, C23 one end connects the first pin of CD4093, C23 other end ground connection, and C24 is in parallel with C23, the first pin of U2 connects Q1 emitter, and it is anodal that the 3rd pin of U2 connects D6, the 4th pin ground connection of U2, and the 6th pin of U2 connects 5V power supply by resistance R 23, one end of R18 connects D7 negative pole, the R18 other end connects respectively R19 one end and R20 one end, it is anodal that the R19 other end connects D11, the R20 other end connects Q1 base stage, R21 one end connects D9 negative pole, and the R21 other end connects Q1 collector electrode, and the two ends of R22 connect respectively Q1 base stage and Q1 emitter, one end of R24 connects the 6th pin of U2, and the R24 other end connects the first pin of CD4093, the first pin of CD4093 is connected with the second pin, and the 3rd pin of CD4093 connects output, the 7th pin ground connection of CD4093, and the 14 pin of CD4093 connects 5V power supply.
Further, described RS485 telecommunication circuit comprises RS485 communication chip ADM2483 and peripheral circuit, the first pin of communication chip, the 7th pin and the 16 pin are received respectively on 5V power supply, the second pin of communication chip and the 8th pin digital grounding, the 9th pin and the 15 pin ground connection of communication chip, the 3rd pin of communication chip is connected with RX port, the 6th pin of communication chip is connected with TX port, the 12 pin of communication chip is connected on 5V power supply by resistance R 25, the 13 pin of communication chip is by resistance R 28 ground connection, the 4th pin of communication chip is connected with the 5th pin, described peripheral circuit comprises capacitor C 25, capacitor C 26, resistance R 30, resistance R 31, digit chip 74HC14, diode D13, diode D14, capacitor C 27, resistance R 29, the positive pole of capacitor C 25 connects 5V power supply, the negative pole digital grounding of C25, a termination 5V power supply of C26, the other end ground connection of C26, the 14 pin of digit chip connects 3V power supply, the 7th pin digital grounding of digit chip, the first pin of digit chip connects RX port, the 3rd pin and the 5th pin of digit chip connect TX port, the second pin of digit chip is connected with the positive pole of D16 by resistance R 31, the 4th pin of digit chip is connected with the positive pole of D15 by resistance R 30, the negative pole of D15 and the negative pole of D16 be digital grounding respectively, the 6th pin of digit chip connects the 4th pin of communication chip, the two ends of R26 connect respectively the 12 pin and the first input end mouth of communication chip, the two ends of R27 connect respectively the 13 pin and second input port of communication chip, one end of D13 connects first input end mouth, other end ground connection, one end of D14 connects the second input port, other end ground connection, one end of R29 connects ETH interface, other end ground connection, C27 and R29 also connect.
Further, described switching signal input circuit comprises resistance R 32, resistance R 33, resistance R 34, resistance R 35, resistance R 36, capacitor C 28, capacitor C 29, capacitor C 30, capacitor C 31, capacitor C 32, diode D17, diode D18, diode D19, diode D20 and optocoupler U3, one end of R32 connects input 1, it is anodal that the R32 other end connects D17, one end of R33 connects input 2, it is anodal that the R33 other end connects D18, C28 two ends connect respectively D17 negative pole and D18 negative pole, C29 and C30 are in parallel with C28 respectively, the positive pole of D19 connects D18 negative pole, D19 negative pole connects D17 negative pole, the two ends of R34 connect respectively D17 negative pole and D20 negative pole, the anodal D18 negative pole that connects of D20, U3 the first pin connects D20 negative pole, it is anodal that U3 the 3rd pin connects D20, U3 the 4th pin digital grounding, U3 the 6th pin connects 5V power supply by resistance R 35, R36 two ends connect respectively U3 the 6th pin and output, C31 mono-termination output, C31 other end digital grounding, C32 is in parallel with C31.
The invention has the beneficial effects as follows: the present invention is by the signal of Real-time Collection frequency conversion; by the control of central processing unit and PLC; low voltage starting and the soft handover of frequency converter work frequency conversion state have been realized; while having avoided direct-cut operation, produce the problem of impulse current; effectively protected power equipment; greatly extended the useful life of power equipment; and; the present invention can also be presented on display screen by the state of frequency conversion, operating process in real time; whole process to equipment state and frequency conversion has formed intuitive and accurate control, has improved greatly efficiency.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the circuit theory diagrams of power module of the present invention;
Fig. 3 is the present invention's one road signal acquisition circuit schematic diagram;
Fig. 4 is the present invention's one road RS485 telecommunication circuit schematic diagram;
Fig. 5 is switching signal input circuit schematic diagram of the present invention;
Fig. 6 is the annexation schematic diagram of the present invention while using state.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention is described, should be appreciated that exemplifying embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
The online switching device shifter of frequency conversion power frequency as shown in Figure 1, it comprises power module, processing module, EEPROM, output module, signal acquisition module, switching signal input circuit, display module, described processing module comprises central processing unit and communication module, described central processing unit adopts 32 ARM chip STM32F103, described communication module comprises two-way RS485 telecommunication circuit, and described two-way RS485 telecommunication circuit is electrically connected to respectively on central processing unit; Described signal acquisition module comprises 4 road signal acquisition circuits, and 4 described road signal acquisition circuits are connected respectively on central processing unit; Described switching signal input circuit and EEPROM are electrically connected to respectively on central processing unit; Described output module comprises two-way relay output module, and described two-way relay output module is electrically connected to respectively on central processing unit; Described display module comprises display circuit and display screen, and described display circuit connects respectively central processing unit and display screen; Described power module provides 3 road 5V supplies of electric power for whole device.
As shown in Figure 2, described power module comprises transformer T, current rectifying and wave filtering circuit, RCD circuit, feedback radiating circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit, the input of described current rectifying and wave filtering circuit is connected in 220V AC power by choking-winding, the output of current rectifying and wave filtering circuit is connected with the input of RCD circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit is connected with the output of RCD circuit by transformer respectively with tertiary voltage output circuit, the input of described feedback radiating circuit is connected with the first voltage follower circuit, the output of feedback radiating circuit is connected with feedback receiving circuit, feedback receiving circuit is connected with the output of current rectifying and wave filtering circuit by power-supply controller of electric.
Described transformer T comprises the first winding, the second winding, the tertiary winding, the 4th winding and the 5th winding, the first described winding is input and is provided with input port 1 and input port 2, the second described winding is output and is provided with output port 3 and output port 4, the described tertiary winding is output and is provided with output port 5 and output port 6, the 4th described winding is output and is provided with output port 7 and output port 8, and the 5th described winding is output and is provided with output port 9 and output port 10.
Described current rectifying and wave filtering circuit comprises rectifier bridge BD1, capacitor C 1 and resistance R 1, mainly play the effect of rectification and filtering, two inputs of BD1 are connected with two outputs of choking-winding L1X respectively, an input of L1X is connected with live wire by fuse FS1, another input of L1X is connected with zero line by thermistor RTH, described capacitor C 1 is connected with two outputs of rectifier bridge BD1 respectively, and the minus earth of capacitor C 1, resistance R 1 is in parallel with capacitor C 1, wherein, choking-winding L1X can eliminate the common mode disturbances of feeder ear, fuse FS1 plays over-current and-load protective effect, thermistor RTH plays metering function.
Described RCD circuit comprises diode D1, diode D2, capacitor C 2, resistance R 2 and resistance R 3, is mainly used to absorb the moment peak voltage producing, thus protection transformer and control chip.The positive pole of D1 is connected with transformer T input port 1 with capacitor C 1 is anodal respectively, and the negative pole of D1 is connected with one end of R3, and the other end of R3 is connected with the negative pole of D2, and the positive pole of D2 is connected with the input port 2 of transformer T, and capacitor C 2 and resistance R 2 are in parallel with D1 respectively.
The first described voltage follower circuit comprises diode D3, resistance R 4, capacitor C 3, capacitor C 4, capacitor C 5, resistance R 5, inductance L 1, capacitor C 6 and capacitor C 7, and D3 is fast recovery rectifier diode, plays rectified action; C3 works to suppress concussion; protection rectifier diode, c4 is voltage stabilizing prime filter capacitor, absorbs voltage clutter; R5 is dummy load; power supply concussion while preventing rear class zero load, C7 is output filter capacitor, eliminates voltage ripple and clutter; L1 is outputting inductance, strobes.The positive pole of D3 is connected with the output port 3 of transformer T, the negative pole of D3 is connected to one end of L1 by fuse FS2, the other end of L1 is connected to the first positive polarity delivery outlet, one end of R4 is connected with the positive pole of D3, the other end of R4 is connected with one end of C3, the other end of C3 is connected with the negative pole of D3, the positive pole of C4 is connected with the negative pole of D3, the negative pole of C4 is connected with the first voltage negative pole delivery outlet, one end of C5 is connected with the input port 1 of transformer T, the other end of C5 is connected with the negative pole of C4, R5 is in parallel with C4, the positive pole of C6 is connected with the first positive polarity delivery outlet, the negative pole of C6 is connected with the first voltage negative pole delivery outlet, C7 is in parallel with C6.
Described feedback radiating circuit comprises resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 8, controllable accurate source of stable pressure TL431, optical coupler U1; be used for guaranteeing guaranteeing output voltage when load variations; wherein TL431 is a reference source; R7, R9, R10 form collection regulating networks; R6 is current-limiting resistance; R8 is protective resistance; the input of protection optocoupler U1; the isolation of late-class circuit and the transmission of feedback signal before optocoupler U1 guarantees; C8 is the filter capacitor of feedback circuit, prevents from disturbing.One end of R6 is connected with the positive pole of C4, the other end of R6 is connected with the first input end of U1, the two ends of R8 are connected with U1 the second input with U1 first input end respectively, one end of R7 is connected with the first positive polarity delivery outlet, the other end of R7 is connected with C8 one end with the B utmost point of TL431 respectively, the other end of C8 is connected with the second input of U1, the K utmost point of TL431 is connected with the second input of U1, the A utmost point of TL431 is connected with one end of R10, the other end of R10 is connected with one end of R9, the other end of R9 is connected with the B utmost point of TL431, the A utmost point of TL431 is also connected with the first voltage negative pole delivery outlet.
Described feedback receiving circuit comprises diode D4, capacitor C 9, capacitor C 10, capacitor C 11, resistance R 11, resistance R 12, and D4 is fast recovery rectifier diode, C9, C10, C11 is filter circuit, R11 is current-limiting resistance, the charging current that suppresses capacitor C 10, the positive pole of D4 is connected with the output port 9 of transformer T, the negative pole of D4 is connected with the positive pole of C9, the minus earth of C9, one end of R11 is connected with the C port of power-supply controller of electric TOP244, the other end of R11 is connected with the positive pole of C10, the minus earth of C10, one end of C11 is connected with the C port of power-supply controller of electric TOP244, the other end ground connection of C11, one end of R12 is connected with the X port of power-supply controller of electric TOP244, the other end ground connection of R12, the output port 10 of transformer T, the F port of power-supply controller of electric TOP244, the S port of power-supply controller of electric TOP244 is ground connection respectively, the D port of power-supply controller of electric TOP244 is connected on the input port 2 of transformer T, the L port of power-supply controller of electric TOP244 is connected with the positive pole of capacitor C 1 by resistance R 13, two outputs of U1 are connected with the negative pole of D4 and the C port of power-supply controller of electric TOP244 respectively, wherein, TOP244 produces pwm signal, R13 is existing voltage acquisition current-limiting resistance.
Described second voltage output circuit comprises diode D5, resistance R 14, capacitor C 12, capacitor C 13, capacitor C 14, circuit of three-terminal voltage-stabilizing integrated U2, U2 guarantees output voltage stabilization, D5 is fast recovery rectifier diode, play rectified action, C13, C14 are output filter capacitor, eliminate voltage ripple and clutter, C12 is voltage stabilizing prime filter capacitor, absorb voltage clutter, R14 is dummy load, prevents the effect of power supply concussion when rear class is unloaded.The positive pole of D5 is connected with the output port 5 of transformer T, the negative pole of D5 is connected with the positive pole of C12, the negative pole of C12 is connected with the output port 6 of transformer T, R14 is in parallel with C12, the input pin of U2 is connected with the negative pole of D5, the output pin of U2 is connected with the anodal delivery outlet of second voltage by fuse FS3, the grounding pin of U2 is connected with second voltage negative pole delivery outlet, the positive pole of C13 is connected with the anodal delivery outlet of second voltage, the negative pole of C13 is connected with second voltage negative pole delivery outlet, C14 is in parallel with C13, and the negative pole of C12 is also connected with the negative pole of C13.
Described tertiary voltage output circuit comprises diode D6, resistance R 15, capacitor C 15, capacitor C 16, capacitor C 17, circuit of three-terminal voltage-stabilizing integrated U3, U3 guarantees output voltage stabilization, D6 is fast recovery rectifier diode, play rectified action, C16, C17 are output filter capacitor, eliminate voltage ripple and clutter, C15 is voltage stabilizing prime filter capacitor, absorb voltage clutter, R15 is dummy load, prevents the effect of power supply concussion when rear class is unloaded.The positive pole of D6 is connected with the output port 7 of transformer T, the negative pole of D6 is connected with the positive pole of C15, the negative pole of C15 is connected with the output port 8 of transformer T, R15 is in parallel with C15, the input pin of U3 is connected with the negative pole of D6, the output pin of U3 is connected with the anodal delivery outlet of tertiary voltage by fuse FS4, the grounding pin of U3 is connected with tertiary voltage negative pole delivery outlet, the positive pole of C16 is connected with the anodal delivery outlet of tertiary voltage, the negative pole of C16 is connected with tertiary voltage negative pole delivery outlet, C17 is in parallel with C16, and the negative pole of C15 is also connected with the negative pole of C17.
Preferably, FS2, FS3, FS4 are resettable fuse, prevent output overloading or short circuit, it is 7805 circuit of three-terminal voltage-stabilizing integrated that described circuit of three-terminal voltage-stabilizing integrated U2 and circuit of three-terminal voltage-stabilizing integrated U3 all adopt model, described capacitor C 1, capacitor C 4, capacitor C 6, capacitor C 9, capacitor C 10, capacitor C 12, capacitor C 13, capacitor C 15, capacitor C 16 are polar capacitor, and described resistance R 10 is variable resistance.
After the access of 220V alternating current, after a series of processing such as over commutation, filtering, step-down, voltage stabilizing, power supply control, direct voltage from first voltage output end output 5V, 2A, from the direct voltage of second voltage output output 5V, 0.2A, from the direct voltage of tertiary voltage output output 5V, 0.2A.
Signal acquisition module comprises the signal acquisition circuit that 4 tunnels are identical, as shown in Figure 3, described signal acquisition circuit comprises resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, resistance R 24, capacitor C 18, capacitor C 19, capacitor C 20, capacitor C 21, capacitor C 22, capacitor C 23, capacitor C 24, triode Q1, diode D7, diode D8, diode D9, diode D10, diode D11, diode D12, optocoupler U2 and Schmidt trigger CD4093
One end of R16 connects first input end, the other end of R16 connects the positive pole of D7, one end of R17 connects the second input, the other end of R17 connects the negative pole of D8, the positive pole of D9 connects D7 negative pole, and the negative pole of D9 connects the negative pole of D10, and the positive pole of D10 connects respectively D11 positive pole and D12 positive pole, the negative pole of D11 connects Q1 base stage, and D12 negative pole connects Q1 emitter;
The two ends of C18 connect respectively D7 positive pole and D8 negative pole, the two ends of C19 connect respectively D7 negative pole and D8 is anodal, C20 and C21 are in parallel with D10 respectively, one end of C22 connects Q1 base stage, it is anodal that the C22 other end connects D11, C23 one end connects the first pin of CD4093, C23 other end ground connection, and C24 is in parallel with C23;
The first pin of U2 connects Q1 emitter, and it is anodal that the 3rd pin of U2 connects D6, the 4th pin ground connection of U2, and the 6th pin of U2 connects 5V power supply by resistance R 23;
One end of R18 connects D7 negative pole, the R18 other end connects respectively R19 one end and R20 one end, it is anodal that the R19 other end connects D11, the R20 other end connects Q1 base stage, R21 one end connects D9 negative pole, and the R21 other end connects Q1 collector electrode, and the two ends of R22 connect respectively Q1 base stage and Q1 emitter, one end of R24 connects the 6th pin of U2, and the R24 other end connects the first pin of CD4093;
The first pin of CD4093 is connected with the second pin, and the 3rd pin of CD4093 connects output, the 7th pin ground connection of CD4093, and the 14 pin of CD4093 connects 5V power supply.
In foregoing circuit, described 5V power supply is by a capacity earth, and this electric capacity is used for decoupling and shaping, the wild effect of power supply can be weakened the impact of circuit, the model of described U2 is TLP185, and described D10 and D11 are voltage stabilizing didoe, and described Q1 is NPN type triode.
Complete signal acquisition circuit by four independently foregoing circuit form, this circuit first input end and the second input are connected respectively input and the output of converter power supply, the Transistor-Transistor Logic level signal that changes standard into by foregoing circuit is to CPU element, in this circuit:
R16, R17 form step-down Acquisition Circuit, realize the step-down of 380V input signal is processed.
C18 realizes gathering the absorption of the waveform spike of power supply.
D7, D8 are rectifier diode, and the AC signal of input is changed to direct current signal.
C22 is filter capacitor, stablizes input signal.
R18, R19 form signal attenuation circuit, and assurance input signal is decayed in proportion, and after decay, signal, by current-limiting resistance R20 and filter capacitor C22, is sent to the ground level of triode Q1, carries out ratio amplification, controls the operating state of optocoupler U2.
R22 is protective resistance, prevents from extremely inputting the impact to triode Q1.
D11 is 3V voltage-stabiliser tube, guarantees the input signal of triode Q1, thereby is no more than 3V protection triode.
The input of D12 protection optocoupler U1, guarantees that the pressure drop of optocoupler keeps and 0.7V.
D9, D10, C20, C21 are current rectifying and wave filtering circuit, and for the work of optocoupler U2 provides sufficient power supply, wherein, D10 is 5.1V voltage-stabiliser tube, guarantee the stable and 5.1V of this supply voltage; C19, C20 are filter circuit.
Resistance R 21 is current-limiting resistance, and the electric current while guaranteeing optocoupler U2 work maintains zone of reasonableness.
Resistance R 23 is pull-up resistor, for rear class output provides sufficient driving force.
R24, C23, C24 form RC filter network, eliminate the abnormal spike of input, make input signal more stable.
Schmidt trigger CD4093 plays shaping operation, guarantees that signal is output as the Transistor-Transistor Logic level of standard.
Described communication module comprises the RS485 telecommunication circuit that two-way is identical, the one embedded frequency conversion communication protocol in tunnel, by communication mode, gather the operational factor of frequency converter, the embedded Modbus agreement in another road, be connected with host computer, the frequency conversion state gathering and the operating state of switch are uploaded to host computer, as shown in Figure 4, described RS485 telecommunication circuit comprises RS485 communication chip ADM2483 and peripheral circuit, the first pin of communication chip, the 7th pin and the 16 pin are received respectively on 5V power supply, the second pin of communication chip and the 8th pin digital grounding, the 9th pin and the 15 pin ground connection of communication chip, the 3rd pin of communication chip is connected with RX port, the 6th pin of communication chip is connected with TX port, the 12 pin of communication chip is connected on 5V power supply by resistance R 25, the 13 pin of communication chip is by resistance R 28 ground connection, the 4th pin of communication chip is connected with the 5th pin, described peripheral circuit comprises capacitor C 25, capacitor C 26, resistance R 30, resistance R 31, digit chip 74HC14, diode D13, diode D14, capacitor C 27, resistance R 29, the positive pole of capacitor C 25 connects 5V power supply, the negative pole digital grounding of C25, a termination 5V power supply of C26, the other end ground connection of C26, the 14 pin of digit chip connects 3V power supply, the 7th pin digital grounding of digit chip, the first pin of digit chip connects RX port, the 3rd pin and the 5th pin of digit chip connect TX port, the second pin of digit chip is connected with the positive pole of D16 by resistance R 31, the 4th pin of digit chip is connected with the positive pole of D15 by resistance R 30, the negative pole of D15 and the negative pole of D16 be digital grounding respectively, the 6th pin of digit chip connects the 4th pin of communication chip, the two ends of R26 connect respectively the 12 pin and the first input end mouth of communication chip, the two ends of R27 connect respectively the 13 pin and second input port of communication chip, one end of D13 connects first input end mouth, other end ground connection, one end of D14 connects the second input port, other end ground connection, one end of R29 connects ETH interface, other end ground connection, C27 and R29 also connect.
Wherein, RS485 communication chip ADM2483 is a integrated form electric current isolating device, be applicable to the bidirectional data communication of multi-point bus transmission line, it designs for balanced transmission line, meet ANSI TIA/EIA RS-485-A and ISO 8482:1987 (E) standard, this device adopts the iCoupler technology of ADI company, by 3 member passage way isolating apparatus, tri-state differential line driver and difference input sink are integrated in single encapsulation, in circuit, play communication isolating and level conversion effect, and, this chip adopts independently Power supply of two-way, realize power supply isolation.
Capacitor C 25, C26 be for moving back lotus root electric capacity, in order to eliminate the unusual waveforms of power supply and to absorb chip operation and the pulse that produces.
Not gate digit chip 74HC14 realizes the transmission of ADUM2483 and accepts control; because the delay of 74HC14 is very little; assurance realizes zero propagation and sends and accept; simultaneously; 74HC14, R30, R31, D15, the common indication realizing bus data transmission receive status of D16; be convenient to observe and understand data interaction state; concrete function is: 74HC14 realizes amplifying and drives function; R30, R31 are current-limiting resistance; limiting circuit current protection diode; D15, D16 are light-emitting diode, realize the indication to operating state.
R25, R28 are bus biasing resistor, have strengthened bus driver ability, have guaranteed transmittability and the antijamming capability of signal.
R26, R27 are current limliting protective resistance, can be when abnormal signal, and limiting input current, thereby protection late-class circuit.
D13, D14 are transient voltage twin zener dioder; select P6KE15CA; the advantages such as this diode possesses fast response time, instantaneous absorbed power is large, leakage current is little (microampere order), conducting voltage precision is high, clamping voltage is more easy to control, volume is little; can effectively suppress common mode, differential mode interference, protection late-class circuit exempts from the various Electromagnetic Interference such as static, thunder and lightning, switching overvoltage.
R29, C27 form RC network, realize due to voltage spikes and can leak in time and cause the earth, thereby play the effect of protection bus.
Wherein, described first input end mouth and the second input port are that host computer communication port or frequency converter are communicated by letter and gathered port, described D15 and D16 are light-emitting diode, described C25 is for there being polar capacitor, described D13 and D14 are voltage stabilizing didoe, the power supply rated current of described C25, communication chip the 7th pin and communication chip the first pin access is 2A, and the power supply rated current of described C26, R25 and communication chip the 16 pin access is 0.2A.
As shown in Figure 5, described switching signal input circuit comprises resistance R 32, resistance R 33, resistance R 34, resistance R 35, resistance R 36, capacitor C 28, capacitor C 29, capacitor C 30, capacitor C 31, capacitor C 32, diode D17, diode D18, diode D19, diode D20 and optocoupler U3, one end of R32 connects input 1, it is anodal that the R32 other end connects D17, one end of R33 connects input 2, it is anodal that the R33 other end connects D18, C28 two ends connect respectively D17 negative pole and D18 negative pole, C29 and C30 are in parallel with C28 respectively, the positive pole of D19 connects D18 negative pole, D19 negative pole connects D17 negative pole, the two ends of R34 connect respectively D17 negative pole and D20 negative pole, the anodal D18 negative pole that connects of D20, U3 the first pin connects D20 negative pole, it is anodal that U3 the 3rd pin connects D20, U3 the 4th pin digital grounding, U3 the 6th pin connects 5V power supply by resistance R 35, R36 two ends connect respectively U3 the 6th pin and output, C31 mono-termination output, C31 other end digital grounding, C32 is in parallel with C31.
The high-voltage signal that this main circuit will be realized input is converted to the acceptable low voltage signal of CPU, and wherein, R32, R33 form dropping resistor network, reduce the voltage magnitude of input signal; D17, D18 are rectifier diode, by the AC signal rectification of input, are direct current signal; C28 is pulse absorb electric capacity, absorbs impulse wave; D19 is voltage stabilizing didoe; C29, C30 are filter circuit, play the effect of filtering; U3 is that model is the photoisolator of TLP185, plays buffer action; D20 is used for protecting the input of photoelectrical coupler; R35 is pull-up resistor, strengthens the driving force of output signal; R36, C31, C32 are RC filter network, the unusual part of filtered signal.
As shown in Figure 6, QF1, QF2 are circuit breaker, and KM1, KM2, KM3 are contactor, and KH1 is thermal relay, once motor overload, overcurrent shield.The online switching device shifter of frequency conversion power frequency is accepted, after instruction that remote controllers or PLC, host computer send, to gather input/output signal the real-time tracking of frequency converters by terminal 1, terminal 2, terminal 3, terminal 4, terminal 5, terminal 6.
If followed the tracks of successfully, terminal 14,15 closures are sent signal, and remote controllers or PLC, host computer are accepted after this signal, disconnect KM1, KM2 adhesive simultaneously KM3, switch to power frequency loop, realize and switching.
If followed the tracks of unsuccessfully, terminal 8,9,10 sends signal to remote controllers or PLC, host computer, and the online switching device shifter of frequency conversion power frequency gathers the operational factor of frequency conversions by communication terminal 17,18, and by terminal 19,20, realizes isolation and forward.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; can not therefore think the restriction to scope of patent protection of the present invention; those of ordinary skill in the art is under enlightenment of the present invention; do not departing from the scope situation that the claims in the present invention protect; can also make the various deformation such as replacement, simple combination, within these all fall into protection scope of the present invention, the scope of asking for protection of the present invention should be as the criterion with claims.
Claims (7)
1. the online switching device shifter of frequency conversion power frequency, it is characterized in that, comprise power module, processing module, EEPROM, output module, signal acquisition module, switching signal input circuit, display module, described processing module comprises central processing unit and communication module, described communication module comprises two-way RS485 telecommunication circuit, and described two-way RS485 telecommunication circuit is electrically connected to respectively on central processing unit; Described signal acquisition module comprises 4 road signal acquisition circuits, and 4 described road signal acquisition circuits are connected respectively on central processing unit; Described switching signal input circuit and EEPROM are electrically connected to respectively on central processing unit; Described output module comprises two-way relay output module, and described two-way relay output module is electrically connected to respectively on central processing unit; Described display module comprises display circuit and display screen, and described display circuit connects respectively central processing unit and display screen; Described power module provides 3 road 5V supplies of electric power for whole device.
2. the online switching device shifter of frequency conversion power frequency according to claim 1, is characterized in that, described display screen adopts the TFT liquid crystal display of 3.2 cun.
3. the online switching device shifter of frequency conversion power frequency according to claim 1, is characterized in that, described central processing unit adopts 32 ARM chip STM32F103.
4. the online switching device shifter of frequency conversion power frequency according to claim 1, it is characterized in that, described power module comprises transformer T, current rectifying and wave filtering circuit, RCD circuit, feedback radiating circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit, the input of described current rectifying and wave filtering circuit is connected in 220V AC power by choking-winding, the output of current rectifying and wave filtering circuit is connected with the input of RCD circuit, feedback receiving circuit, the first voltage follower circuit, second voltage output circuit is connected with the output of RCD circuit by transformer respectively with tertiary voltage output circuit, the input of described feedback radiating circuit is connected with the first voltage follower circuit, the output of feedback radiating circuit is connected with feedback receiving circuit, feedback receiving circuit is connected with the output of current rectifying and wave filtering circuit by power-supply controller of electric.
5. the online switching device shifter of frequency conversion power frequency according to claim 1, it is characterized in that, described signal acquisition circuit comprises resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, resistance R 24, capacitor C 18, capacitor C 19, capacitor C 20, capacitor C 21, capacitor C 22, capacitor C 23, capacitor C 24, triode Q1, diode D7, diode D8, diode D9, diode D10, diode D11, diode D12, optocoupler U2, Schmidt trigger CD4093, one end of R16 connects first input end, the other end of R16 connects the positive pole of D7, one end of R17 connects the second input, the other end of R17 connects the negative pole of D8, the positive pole of D9 connects D7 negative pole, the negative pole of D9 connects the negative pole of D10, the positive pole of D10 connects respectively D11 positive pole and D12 positive pole, the negative pole of D11 connects Q1 base stage, D12 negative pole connects Q1 emitter, the two ends of C18 connect respectively D7 positive pole and D8 negative pole, the two ends of C19 connect respectively D7 negative pole and D8 is anodal, C20 and C21 are in parallel with D10 respectively, one end of C22 connects Q1 base stage, it is anodal that the C22 other end connects D11, C23 one end connects the first pin of CD4093, C23 other end ground connection, and C24 is in parallel with C23, the first pin of U2 connects Q1 emitter, and it is anodal that the 3rd pin of U2 connects D6, the 4th pin ground connection of U2, and the 6th pin of U2 connects 5V power supply by resistance R 23, one end of R18 connects D7 negative pole, the R18 other end connects respectively R19 one end and R20 one end, it is anodal that the R19 other end connects D11, the R20 other end connects Q1 base stage, R21 one end connects D9 negative pole, and the R21 other end connects Q1 collector electrode, and the two ends of R22 connect respectively Q1 base stage and Q1 emitter, one end of R24 connects the 6th pin of U2, and the R24 other end connects the first pin of CD4093, the first pin of CD4093 is connected with the second pin, and the 3rd pin of CD4093 connects output, the 7th pin ground connection of CD4093, and the 14 pin of CD4093 connects 5V power supply.
6. the online switching device shifter of frequency conversion power frequency according to claim 1, it is characterized in that, described RS485 telecommunication circuit comprises RS485 communication chip ADM2483 and peripheral circuit, the first pin of communication chip, the 7th pin and the 16 pin are received respectively on 5V power supply, the second pin of communication chip and the 8th pin digital grounding, the 9th pin and the 15 pin ground connection of communication chip, the 3rd pin of communication chip is connected with RX port, the 6th pin of communication chip is connected with TX port, the 12 pin of communication chip is connected on 5V power supply by resistance R 25, the 13 pin of communication chip is by resistance R 28 ground connection, the 4th pin of communication chip is connected with the 5th pin, described peripheral circuit comprises capacitor C 25, capacitor C 26, resistance R 30, resistance R 31, digit chip 74HC14, diode D13, diode D14, capacitor C 27, resistance R 29, the positive pole of capacitor C 25 connects 5V power supply, the negative pole digital grounding of C25, a termination 5V power supply of C26, the other end ground connection of C26, the 14 pin of digit chip connects 3V power supply, the 7th pin digital grounding of digit chip, the first pin of digit chip connects the RX port of Transistor-Transistor Logic level, the 3rd pin of digit chip and the 5th pin connect the TX port of Transistor-Transistor Logic level, the second pin of digit chip is connected with the positive pole of D16 by resistance R 31, the 4th pin of digit chip is connected with the positive pole of D15 by resistance R 30, the negative pole of D15 and the negative pole of D16 be digital grounding respectively, the 6th pin of digit chip connects the 4th pin of communication chip, the two ends of R26 connect respectively the 12 pin and the first input end mouth of communication chip, the two ends of R27 connect respectively the 13 pin and second input port of communication chip, one end of D13 connects first input end mouth, other end ground connection, one end of D14 connects the second input port, other end ground connection, one end of R29 connects ETH interface, other end ground connection, C27 and R29 also connect.
7. the online switching device shifter of frequency conversion power frequency according to claim 1, is characterized in that, described switching signal input circuit comprises resistance R 32, resistance R 33, resistance R 34, resistance R 35, resistance R 36, capacitor C 28, capacitor C 29, capacitor C 30, capacitor C 31, capacitor C 32, diode D17, diode D18, diode D19, diode D20 and optocoupler U3, one end of R32 connects input 1, it is anodal that the R32 other end connects D17, one end of R33 connects input 2, it is anodal that the R33 other end connects D18, C28 two ends connect respectively D17 negative pole and D18 negative pole, C29 and C30 are in parallel with C28 respectively, the positive pole of D19 connects D18 negative pole, D19 negative pole connects D17 negative pole, the two ends of R34 connect respectively D17 negative pole and D20 negative pole, the anodal D18 negative pole that connects of D20, U3 the first pin connects D20 negative pole, it is anodal that U3 the 3rd pin connects D20, U3 the 4th pin digital grounding, U3 the 6th pin connects 5V power supply by resistance R 35, R36 two ends connect respectively U3 the 6th pin and output, C31 mono-termination output, C31 other end digital grounding, C32 is in parallel with C31.
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| CN109378961A (en) * | 2018-09-16 | 2019-02-22 | 湖南沃森电气科技有限公司 | The frequency converter with management is controlled based on UCOS |
| CN109921765A (en) * | 2019-02-28 | 2019-06-21 | 南京瑞贻电子科技有限公司 | A kind of serial communication system of frequency converter and independent controling circuit composition |
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