CN2295286Y - Contact-less reactive power automatic compensating controller - Google Patents

Contact-less reactive power automatic compensating controller Download PDF

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CN2295286Y
CN2295286Y CN 97205887 CN97205887U CN2295286Y CN 2295286 Y CN2295286 Y CN 2295286Y CN 97205887 CN97205887 CN 97205887 CN 97205887 U CN97205887 U CN 97205887U CN 2295286 Y CN2295286 Y CN 2295286Y
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reactive power
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李崇致
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Abstract

The utility model provides a contact less reactive power automatic compensating controller. The utility model comprises a reactive power sampling circuit, a zero crossing detecting circuit, a single chip microcomputer, a frequency divider, a phase shifter, a control gate, and three driving circuits having the same structure, wherein, the single chip computer are respectively connected with the input ends of the reactive power sampling circuit, the zero crossing detecting circuit, and the frequency divider; the output end of the frequency divider is connected with the input end of the phase shifter and the control gate, the output end of the phase shifter is connected with the driving circuits through the control gate, and the switch of a compensation capacitor can be controlled. The technical proposal of the utility model can directly detect the reactive power of an electric network; as the utility model adopts the periodicity fast sampling compensation technique and the pulse string trigger technique, the dynamic response time is short, the utility model can adapt to the fast variation of the electric network, and performance is stable and reliable.

Description

The contact-less reactive power automatic compensating controller
The utility model provides a kind of contact-less reactive power automatic compensating controller, belongs to the regulating and controlling device field of electric weight.
The existing at present technology report that compensates automatically about contact-less reactive power, its technical scheme majority is to adopt the reactive current honeybee value that directly detects inductive load, each cycle detects and compensates once every phase current, as Chinese patent communique invention disclosed patent on May 23rd, 90: state type automatic compensation method of reactive power, application number: 89103959 is characterized in that: measure three line currents respectively, and be three magnitudes of voltage that are directly proportional with tested current transitions, after amplifying, send analog to digital converter to by variable connector, convert three groups of K bit sign indicating numbers to, import the reactive current latch again, get each phase current instantaneous value (binary numeral) that each phase voltage zero passage latchs constantly and do not have distant view point switch as each phase building-out capacitor, each mutually secondary or power supply buses of the transformer that compensates to quilt is input compensation electric capacity respectively, building-out capacitor advances power setting, minimum capacity C by K level two.The peak value of the offset current that provides is corresponding to the unit value 1 that latchs binary numeral, utilize clock-signal generator to produce 12 intervals 1/12nd successively, the square-wave signal in line voltage cycle, the square-wave pulse forward position respectively corresponding to the zero passage of a certain phase voltage or a certain line voltage constantly, upgrade the content of reactive current latch with the rising edge of corresponding phase clock square wave or trailing edge, building-out capacitor gives the positive peak (or negative peak) that is biased in corresponding phase voltage earlier, if being positive peak, building-out capacitor gives biasing, then trigger the noncontacting switch of this phase building-out capacitor with the rising edge of this positive peak moment clock square wave, give biasing if building-out capacitor is a negative peak, then the rising edge with this negative peak moment clock square wave triggers the noncontacting switch that this stares at building-out capacitor.Defective is that the switching time is longer, and sampling is selected to owe rationally, and pulse triggers that this triggering appears in controllable silicon sometimes and the phenomenon that do not trigger, and its stability and reliability all await further raising.
The purpose of this utility model provides a kind of initial data sampling accurately and reliably, is adapted to the quick variation of electrical network, the controllable silicon reliable trigger, and no overvoltage and impulse current generation, performance be the contact-less reactive power automatic compensating controller accurately and reliably.
The purpose of this utility model is achieved in that
A kind of contact-less reactive power automatic compensating controller, comprise reactive power sample circuit, zero cross detection circuit, single-chip microcomputer, frequency divider, phase shifter, control gate and 3 isostructural drive circuits, single-chip microcomputer connects the input of reactive power sample circuit, zero cross detection circuit and frequency divider respectively, the input and the control gate of the output termination phase shifter of frequency divider, the output of phase shifter connects drive circuit through control gate, the switching of control compensation electric capacity.
Described contact-less reactive power automatic compensating controller, reactive power sample circuit comprise current transformer Lc, transformer B 1, B 2, testing circuit 1, testing circuit 2 and A/D converter IC 7Form, wherein testing circuit 1 is by operational amplifier IC 1, potentiometer W 1, resistance R 1-4With diode D 1-2Form, testing circuit 2 is by operational amplifier IC 2, potentiometer W 2, resistance R 5-7With diode D 3-4Form, current transformer Lc is through transformer B 1Connect the inverting input of testing circuit 1, transformer B 2Primary coil get access to grid, its secondary coil one end ground connection, the inverting input of another termination testing circuit 2, the output of testing circuit 1, testing circuit 2 meets A/D converter IC respectively 7Input IN 0, IN 1
Described contact-less reactive power automatic compensating controller, zero cross detection circuit comprises current transformer L A, transformer B 3-4, comparator IC 3-4, inverter ic 21With phase difference detector IC 5Form transformer B 3Primary coil meet current transformer L A, its secondary coil meets comparator IC 3Input, comparator IC 3Output termination phase difference detector IC 5Input, transformer B 4Primary coil meet phase voltage V C, its secondary coil meets comparator IC 4Input, comparator IC 4Output meet single-chip microcomputer IC 6Respectively through inverter ic 21, IC 20Meet phase difference detector IC 5With phase shifter IC 13, phase difference detector IC 5Output connect single-chip microcomputer Pin.
Described contact-less reactive power automatic compensating controller, single-chip microcomputer IC 6Clock signal meet A/D converter IC respectively through the ALE pin 710 pin and with door IC 8Input, and with phase difference detector IC 5Output signal with after meet single-chip microcomputer IC 6Counter T 0Pin, single-chip microcomputer IC 6The Po mouth meet A/D converter IC 7Data output D 0-7With address mouth A, B, C, receive the sampled signal that converts binary reactive current and voltage to.
Described contact-less reactive power automatic compensating controller, single-chip microcomputer IC 6Clock signal output to frequency divider IC through the ALE pin 9, through frequency divider IC 9Signal behind the frequency division meets phase shifter IC 134 pin and frequency divider IC 10, frequency divider IC 10Signal behind the frequency division meets phase shifter IC 1312 pin and with single-chip microcomputer IC 6P 1.0The signal of pin output with after meet control gate IC respectively 14-16Input, single-chip microcomputer IC 8P 1.8The signal and the phase shifter IC of pin output 136 pin output signal with after, meet phase shifter IC respectively 179 pin and control gate IC 14Another input, phase shifter IC 13In addition two outputs, 10 pin, 11 pin meet control gate IC respectively 15, IC 18Another input, control gate IC 14-16Output respectively correspondence meet drive circuit IC 17-19Input.
Described contact-less reactive power automatic compensating controller, drive circuit IC 17By resistance, triode, diode DW 1-4, pulse transformer, controllable silicon and electric capacity forms, wherein the base stage of triode connects the output of control gate through resistance, its grounded emitter, its collector electrode is respectively through diode DW 1, pulse transformer primary coil connect power supply, the secondary coil of pulse transformer connect respectively the silicon controlled negative electrode and control the utmost point, connect the precharge diode between the silicon controlled cathode and anode, the silicon controlled negative electrode gets access to grid, its anode gets access to grid through electric capacity.
The utility model compared with prior art, the directly reactive power and the compensation of cycle sampling electrical network, the fluctuation of responsive electricity grid fast, adopt the pulse train triggering mode of peak point, guaranteed that silicon controlled reliably triggers, and do not have overvoltage, impulse current generation, organize capacitor switching more and allow to settle at one go, stable and reliable for performance.
Fig. 1 is an operation principle block diagram of the present utility model.
Fig. 2 is the partial circuit figure of the utility model embodiment.
Fig. 3 is the circuit diagram of the utility model embodiment drive circuit.
The utility model is described in further detail below in conjunction with accompanying drawing.
Current transformer Lc meets transformer B 1Primary coil, transformer B 1Secondary coil meet operational amplifier IC 1Inverting input, transformer B 2The primary coil A, the B line that get access to grid, its secondary coil meets operational amplifier IC 2Inverting input.Operational amplifier IC 1-2The output correspondence meets A/D converter IC 7IN 0, IN 1End, A/D converter IC 7Data port D 0-7Meet the P of single-chip microcomputer with address mouth A, B, C pin 0Mouthful, its 7 pin is through inverter ic 22Meet the P of single-chip microcomputer 1.7Pin, current transformer L AMeet transformer B 3Primary coil, transformer B 3Secondary coil through resistance R 3Meet comparator IC 3Input, comparator IC 3Inverting input is ground connection, diode D respectively 5Negative electrode and diode D 6Anode, its in-phase input end is connecting resistance R respectively 8, diode D 5Anode and diode D 6Negative electrode, its output is respectively through resistance R 9Connect+the 5V power supply, meet phase difference detector IC 511 pin, phase difference detector IC 55,9,14 pin connect+the 5V power supply, 2 pin and 10 pin, 4 pin and 13 pin join, 6,7,8 pin ground connection.Transformer B 4Primary coil the C line, the N line that get access to grid record phase voltage V 0, its secondary coil meets comparator IC 4Input, comparator IC wherein 4In-phase input end respectively through resistance R 10Ground connection, meet diode D 7Negative electrode, diode D 8Anode, diode D 7-8Another termination comparator IC 4Inverting input, comparator IC 4Output meet single-chip microcomputer IC respectively 6
Figure Y9720588700061
Pin, through resistance R 11Connect+the 5V power supply, through inverter ic 20Meet phase shifter IC 137 pin and through inverter ic 21Meet phase difference detector IC 53 pin, phase difference detector IC 51 pin connect single-chip microcomputer
Figure Y9720588700062
Pin and with door IC 3Input, single-chip microcomputer IC 6The ALE pin connect with the door IC 8Another input and A/D converter IC 710 pin, with door IC 8Output termination T 0Like this, line current Ic and line voltage V ABRespectively through transformer B 1, B 2Correspondence is input to operational amplifier IC 1, IC 2, by operational amplifier IC 1-2Sampled signal is input to A/D converter IC 7, meanwhile, phase voltage Vc is through transformer B 4, be input to comparator IC 4Form square-wave signal, its signal meets single-chip microcomputer IC respectively 6 Pin, control A/D converter IC 7With sample line electric current I c, line voltage V ABConvert digital quantity to and output to single-chip microcomputer, guaranteed the accuracy and the reliability of sampled value, in like manner, line current I AThrough transformer B 3, comparator IC 3Form square wave, with comparator IC 4The square wave of output is through inverter ic 21Deliver to phase difference detector IC together 5, IC 5Output through and door IC 8Send into single-chip microcomputer, thereby guaranteed the correct sampling of power-factor angle.
Single-chip microcomputer IC 6Clock signal meet frequency divider IC successively through the ALE pin 9With frequency divider IC 10, obtain the pulse train of 9.6KHZ and 4.8KHZ respectively, corresponding input phase shifter IC 134,12 pin, as phase-shift pulse, comparator IC 4The square-wave signal of output is through inverter ic 20Meet phase shifter IC after anti-phase 137 pin, as by phase shift signal, phase shifter IC 136,10,11 pin export three the tunnel by the square-wave signal after the phase shift, its rising edge is corresponding line voltage V respectively CA, V AB, V BCPositive peak, trigger controllable silicon when having guaranteed the on-Line Voltage positive peak, and non-impact current produces.Single-chip microcomputer IC 6P 1.2With phase shifter IC 136 pin connect with the door IC 12Input, its output meets phase shifter IC respectively 139 pin and control gate IC 14An input, single-chip microcomputer IC 6P 1.0Pin and frequency divider IC 10The output termination with the door IC 11Input, the signal of Xiang Yuhou meets control gate IC respectively through its output 14-16An input, when reactive power reaches thresholding, single-chip microcomputer IC 6With P 1.0The pin set.4.8KHZ pulse train warp and door IC 11Send respectively and control gate IC 14-16, simultaneously, single-chip microcomputer IC 6P 1.2The pin set is by the square wave of phase shift warp and door IC 12Be input to control gate IC 14, control gate IC 14Output termination drive circuit IC 17, in like manner, phase shifter IC 13Through 10 pin, 11 pin output by the square wave of phase shift respectively through control gate IC 15, IC 16Correspondence meets drive circuit IC 18, IC 19
Drive circuit IC 17-19Isostructure is with drive circuit IC 17Be example: by resistance r 1, triode G 1, diode DW 1-3, pulse transformer B 5, controllable silicon T 1And capacitor C 1Form, wherein triode G 1Base stage through resistance r 1Meet control gate IC 14Output, its grounded emitter, its collector electrode is respectively through diode DW 1, pulse transformer B 5Primary coil connect power supply, pulse transformer B 5Secondary coil meet controllable silicon T respectively 1Negative electrode and control the utmost point, controllable silicon T 1Cathode and anode between be connected to and give charging diode DW 4, controllable silicon T 1Anode through capacitor C 1Get access to grid.Its operation principle is: control gate IC 14The pulse train of output is through resistance r 1Meet triode G 1Base stage, make triode G 1Conducting is through pulse transformer B 5Export interrupted pulse train and trigger controllable silicon T 1, guarantee controllable silicon T 1Effective triggering, with building-out capacitor C 1Drop into electrical network.

Claims (6)

1, a kind of contact-less reactive power automatic compensating controller, comprise reactive power sample circuit, zero cross detection circuit, single-chip microcomputer, frequency divider, phase shifter, control gate and 3 isostructural drive circuits, it is characterized in that: single-chip microcomputer connects the input of reactive power sample circuit, zero cross detection circuit and frequency divider respectively, the input and the control gate of the output termination phase shifter of frequency divider, the output of phase shifter connects drive circuit through control gate, the switching of control compensation electric capacity.
2, contact-less reactive power automatic compensating controller as claimed in claim 1 is characterized in that: the reactive power sample circuit comprises current transformer Lc, transformer B 1, B 2, testing circuit (1), testing circuit (2) and A/D converter IC 7Form, wherein testing circuit (1) is by operational amplifier IC 1, potentiometer W 1, resistance R 1-4With diode D 1-2Form, testing circuit (2) is by operational amplifier IC 2, potentiometer W 2, resistance R 5-7With diode D 3-4Form, current transformer Lc is through transformer B 1Connect the inverting input of testing circuit (1), transformer B 2Primary coil get access to grid, its secondary coil one end ground connection, the inverting input of another termination testing circuit (2), the output of testing circuit (1), testing circuit (2) meets A/D converter IC respectively 7Input IN 0, IN 1
3, contact-less reactive power automatic compensating controller as claimed in claim 1, it is characterized in that: zero cross detection circuit comprises current transformer L A, transformer B 2-4, comparator IC 3-4, inverter ic 21With phase difference detector IC 5Form transformer B 3Primary coil meet current transformer L A, its secondary coil meets comparator IC 3Input, comparator IC 3Output termination phase difference detector IC 5Input, transformer B 4Primary coil meet phase voltage V 6, its secondary coil meets comparator IC 4Input, comparator IC 4Output meet single-chip microcomputer IC 6Respectively through inverter ic 21, IC 20Meet phase difference detector IC 5With phase shifter IC 13, phase difference detector IC 5Output connect single-chip microcomputer
Figure Y9720588700021
Pin.
4, as claim 1 or 2 or 3 described contact-less reactive power automatic compensating controllers, it is characterized in that: single-chip microcomputer IC 6Clock signal meet A/D converter IC respectively through the ALE pin 710 pin and with door IC 8Input, and with phase difference detector IC 5Output signal with after meet single-chip microcomputer IC 6Counter T 0Pin, single-chip microcomputer IC 6The Po mouth meet A/D converter IC 7Data output D 0-7With address mouth A, B, C, receive the sampled signal that converts binary reactive current and voltage to.
5, contact-less reactive power automatic compensating controller as claimed in claim 1 is characterized in that: single-chip microcomputer IC 6Clock signal output to frequency divider IC through the ALE pin 9, through frequency divider IC 9Signal behind the frequency division meets phase shifter IC 134 pin and frequency divider IC 10, frequency divider IC 10Signal behind the frequency division meets phase shifter IC 1312 pin and with single-chip microcomputer IC 6P 1.0The signal of pin output with after meet control gate IC respectively 14-16Input, single-chip microcomputer IC 6P 1.2The signal and the phase shifter IC of pin output 136 pin output signal with after, meet phase shifter IC respectively 119 pin and control gate IC 14Another input, phase shifter IC 13In addition two outputs, 10 pin, 11 pin meet control gate IC respectively 15, IC 16Another input, control gate IC 14-16Output respectively correspondence meet drive circuit IC 17-19Input.
6, as claim 1 or 5 described contact-less reactive power automatic compensating controllers, it is characterized in that drive circuit IC 17By resistance, triode, diode DW 1-4, pulse transformer, controllable silicon and electric capacity forms, wherein the base stage of triode connects the output of control gate through resistance, its grounded emitter, its collector electrode is respectively through diode DW 1, pulse transformer primary coil connect power supply, the secondary coil of pulse transformer connect respectively the silicon controlled negative electrode and control the utmost point, connect the precharge diode between the silicon controlled cathode and anode, the silicon controlled negative electrode gets access to grid, its anode gets access to grid through electric capacity.
CN 97205887 1997-01-10 1997-01-10 Contact-less reactive power automatic compensating controller Expired - Fee Related CN2295286Y (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113890364A (en) * 2020-07-01 2022-01-04 宏碁股份有限公司 Boost converter with improved output stability

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113890364A (en) * 2020-07-01 2022-01-04 宏碁股份有限公司 Boost converter with improved output stability
CN113890364B (en) * 2020-07-01 2023-05-09 宏碁股份有限公司 Boost converter with improved output stability

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