CN103278668A - Stepping current source - Google Patents
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- CN103278668A CN103278668A CN201310175732XA CN201310175732A CN103278668A CN 103278668 A CN103278668 A CN 103278668A CN 201310175732X A CN201310175732X A CN 201310175732XA CN 201310175732 A CN201310175732 A CN 201310175732A CN 103278668 A CN103278668 A CN 103278668A
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Abstract
The invention discloses a stepping current source and belongs to the technical field of virtual instruments. The stepping current source comprises a current generating circuit, a stepping motor drive circuit, a median signal detection circuit, an input signal interface circuit, a current measurement circuit, an output signal interface circuit, a control switching circuit and a control module. The control module is connected with the stepping motor drive circuit, the median signal detection circuit, the input signal interface circuit, the current measurement circuit and the output signal interface circuit; the current generating circuit is connected with the stepping motor drive circuit, the median signal detection circuit, the input signal interface circuit, the current measurement circuit and the control switching circuit; and the control switching circuit is connected with the output signal interface circuit. The stepping current source has the advantages that accurate control of current is realized; a position at which the regulating end of a voltage trimming regulator is located currently can be accurately detected, and thus, a precondition is created for zero returning and current regulation of the voltage trimming regulator; the condition devices are damaged due to the fact that the voltage regulator is regulated out of range is avoided; and a control mode is flexible.
Description
Technical field
The invention belongs to the virtual instrument technique field, be specifically related to a kind of stair step current source.
Background technology
Strong current generator is the essential equipment that big electric current is provided for the electric adjustment of all trades and professions, can produce adjustable big electric current, is used for the test of the various protection features of electrical equipment.At present, in the low-voltage electrical apparatus field tests, the pressure regulator and the low-voltage high-current transformer that generally adopt load motor to drive constitute big electric current constant current source, as Chinese utility model patent Granted publication CN2802836Y disclosed " strong current generator " and Chinese utility model patent Granted publication CN2120378 disclosed " portable adjustable great current generator ", only illustrated that all pressure regulator and low-voltage high-current transformer constitute the unitized construction of strong current generator, do not relate to the drive unit of pressure regulator.In addition, because there is inertia in pressure regulator, it is big to make electric current regulate inertia, and electric current causes vibration when being adjusted near the setting value easily, thereby can influence accuracy of detection.
Chinese utility model patent Granted publication CN201796057U disclosed " based on the current generating apparatus of virtual instrument technique " and for example is though proposed the array mode that coarse adjustment, fine setting pressure regulator cooperatively interact, the drive unit of same not mentioned pressure regulator.For coarse adjustment, the array mode that cooperatively interacts of fine setting pressure regulator, in actual applications, if adopt load motor to drive, the degree of regulation of its fine setting pressure regulator is still limited, especially when electric current was adjusted to setting value, the fine setting pressure regulator still can be in setting value fluctuation back and forth up and down.In addition, in such project organization, the each detection when finishing all will make coarse adjustment, fine setting pressure regulator return zero.If pressure regulator does not return zero in advance, its output voltage will not started from scratch, thereby can reduce the scope that electric current is regulated, even can't play the effect that electric current is regulated.Coarse adjustment pressure regulator and fine setting pressure regulator, because the difference of each self-structure, time Z-operation is also different.Returning of coarse adjustment pressure regulator zero is to make the adjustable side get back to reference position, generally makes the motor counter-rotating by motor driver, and when reference position was got back in the adjustable side, motor stopped operating.And for the fine setting pressure regulator, because its output voltage be potential difference (PD) between its adjustable side and the meta tap, so the time zero of it be the position that the adjustable side is adjusted to meta tap place, and the position at meta tap place namely is its zero-bit.The mode of current most employing time control makes the fine setting pressure regulator return zero, concrete operations are the adjustable side of the pressure regulator of estimation fine setting earlier is adjusted to the meta tap position from upper limit time t, make proper the forwarding to of adjusting of fine setting pressure regulator reach upper limit then, again according to the time t that estimates in advance, make the adjustable side reversing time t of fine setting pressure regulator get back to the meta tap position, can certainly make the adjustable side counter-rotating of fine setting pressure regulator arrive lower limit earlier, just changeing time t from lower limit again and getting back to the meta tap position, the shortcoming of this mode is back that zero accuracy is not high, and time zero-time is long, efficient is relatively poor.If can in whole test process, detect residing position, adjustable side at any time, directly return zero from this position by control circuit regulating and controlling end again, rather than return the meta tap position after getting back to the bound position earlier, so just can shorten back the zero-time greatly.If when detecting the adjustable side and just being in the meta tap position, then control circuit is not done back zero indication.Obviously, if realize above-mentioned conception, the position probing of fine setting pressure regulator adjustable side is a key point, and about this point, in existing pertinent literature, also rarely has design proposal really and reliably.When needs carry out the electric current adjusting, at first by the coarse adjustment pressure regulator electric current is adjusted in the error range of setting value permission, and then startup fine setting pressure regulator is finely tuned electric current.The fine setting pressure regulator according to detected current value be greater than or less than setting value, make the adjustable side correspondingly toward raising or toward downward modulation, it is just opposite that the adjustable side up is in harmonious proportion the polarity of timing fine setting pressure regulator output voltage down.At last, the output voltage of fine setting pressure regulator behind the fine setting transformer with the stack of the output voltage of coarse adjustment pressure regulator, utilize the output current of the Control of Voltage low-voltage high-current transformer of this stack generation.Because the output voltage of fine setting transformer is lower, usually below 20V, and the degree of regulation of electric current is higher, therefore can the fine setting effect of electric current not impacted.
Usually, pressure regulator all is provided with upper limit and lower limit when regulating, and does not upper and lowerly carry out position limitation protection when spacing if arrive, but is rotated further, and pressure regulator self will be impaired.In the prior art, adopt middle-size and small-size microswitch to carry out position limitation protection.Described microswitch has normally opened contact and normally closed contact, and has a common port between the two.When pressure regulator is implemented position limitation protection, need the normally closed contact of microswitch is inserted the electric power loop of pressure regulator drive motor, when being adjusted to extreme position, pressure regulator disconnects the drive motor power supply; Need normally opened contact Access Control circuit again simultaneously, the position signalling when pressure regulator is adjusted to extreme position is transferred to control circuit.Do not disturb mutually for the disconnection that makes motor power and the output of position signalling, power supply and the corresponding interface circuit of a plurality of mutual isolation need be set simultaneously, such project organization more complicated, energy loss is big.
In view of above-mentioned prior art, be necessary existing current feedback circuit is improved, for this reason, the applicant has done useful design, and technical scheme described below produces under this background.
Summary of the invention
The object of the present invention is to provide a kind of stair step current source, it adopts stepper motor that coarse adjustment, fine setting pressure regulator are driven, and has the advantages that output current is big, range of adjustment is wide, precision is high; And the fine setting pressure regulator returns zero accurate positioning, thereby has shortened time zero-time, has improved time zero efficient; The project organization of coarse adjustment, fine setting pressure regulator position limitation protection is reasonable, can simplify the connection of circuit greatly.
The objective of the invention is to reach like this, a kind of stair step current source, comprise current occuring circuit, stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit, interface circuit of output signal, control commutation circuit and control module, described control module and stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit and interface circuit of output signal connect, described current occuring circuit and stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit and control commutation circuit connect, and the control commutation circuit is connected with interface circuit of output signal.
In a specific embodiment of the present invention, described current occuring circuit comprises contactor KM1 first, second main contacts, contactor KM2～KM10 main contacts, circuit breaker Q F1, coarse adjustment pressure regulator TD, fine setting pressure regulator TDW, fine setting transformer BTDW, autotransformer B1, B2 and low-voltage high-current transformer B3, the L1 of the two input termination AC power of described circuit breaker Q F1, the N1 end, two output terminals of circuit breaker Q F1 are connected with an end of contactor KM1 first main contacts and second main contacts respectively, the other end of contactor KM1 first main contacts is connected with the end of coarse adjustment pressure regulator TD and the end of fine setting pressure regulator TDW, the adjustable side of coarse adjustment pressure regulator TD is connected with an end of fine setting transformer BTDW secondary coil, one end of fine setting transformer BTDW primary coil is connected with the adjustable side of fine setting pressure regulator TDW, and be connected with the U+ end of voltage sensor WBV2 in the meta signal deteching circuit, the other end of fine setting transformer BTDW primary coil is connected with the meta tap of fine setting pressure regulator TDW, and hold with the U-of the U+ end of voltage sensor WBV1 in the meta signal deteching circuit and voltage sensor WBV2 and to be connected, the other end of fine setting transformer BTDW secondary coil is connected with the end of autotransformer B1, the 220V of autotransformer B1,150V, 100V, the 70V tap respectively with contactor KM2, KM3, KM4, one end of the main contacts of KM5 connects, contactor KM2, KM3, KM4, the other end of KM5 main contacts is connected with the end of autotransformer B2,6 times of autotransformer B2,2 times, 1.5 doubly, 1.2 doubly, 1 times of tap respectively with contactor KM6, KM7, KM8, KM9, one end of KM10 main contacts connects, contactor KM6, KM7, KM8, KM9, the other end of KM10 main contacts is connected with an end of low-voltage high-current transformer B3 primary coil, one end of low-voltage high-current transformer B3 secondary coil connects lead A, lead A passes the current transformer LH in the current measurement circuit, the other end of low-voltage high-current transformer B3 secondary coil connects lead X, the other end of fine setting pressure regulator TDW, the other end of coarse adjustment pressure regulator TD, autotransformer B1, the other end of the other end of B2 and low-voltage high-current transformer B3 primary coil is connected with the other end of contactor KM1 second main contacts jointly, and is connected with the U-end of voltage sensor WBV1 in the meta signal deteching circuit.
In another specific embodiment of the present invention, described meta signal deteching circuit comprises voltage sensor WBV1, WBV2, Vg end, the GND end of the Vg end of voltage sensor WBV1, GND end and voltage sensor WBV2 are connected with control module, U+, the U-end of the U+ of voltage sensor WBV1, U-end, voltage sensor WBV2 is connected with current occuring circuit, voltage sensor WBV1, WBV2+E end is connected to+the 12V direct supply jointly, voltage sensor WBV1, WBV2-the E end is connected to-the 12V direct supply jointly.
In another specific embodiment of the present invention, described control commutation circuit comprises contactor KM1 coil, contactor KM1 first auxiliary contact, pilot lamp XD1, XD2 and pushbutton switch QA, TA1, TA, the end of described pushbutton switch QA is connected with an end of contactor KM1 first auxiliary contact and the end of pushbutton switch TA1, the other end of pushbutton switch TA1 is connected with the end of pushbutton switch TA, the other end of pushbutton switch TA is connected with an end of contactor KM1 coil and the end of pilot lamp XD2, the end of pilot lamp XD1, the other end of pushbutton switch QA, the other end of contactor KM1 first auxiliary contact connects the L1 end of AC power, the other end of pilot lamp XD1 jointly, the other end of contactor KM1 coil and the other end of pilot lamp XD2 connect the N1 end of AC power jointly; Described control commutation circuit also comprises relay ZJ1～ZJ10 normally opened contact, contactor KM2～KM10 coil and time relay KT coil, normally closed contact, one end of described relay ZJ2～ZJ10 normally opened contact is connected with an end of contactor KM2～KM10 coil respectively, the other end of contactor KM2～KM10 coil is connected with an end of time relay KT normally closed contact, one end of relay ZJ1 normally opened contact is connected with an end of time relay KT coil, the other end of relay ZJ1～ZJ10 normally opened contact connects lead L3 jointly, the other end of first main contacts of the contactor KM1 in lead L3 and the current occuring circuit is connected, the other end of time relay KT coil, the other end of normally closed contact connects lead N3 jointly, and the other end of second main contacts of the contactor KM1 in lead N3 and the current occuring circuit is connected.
Also have in the specific embodiment of the present invention, described current measurement circuit comprises current transformer LH and current sensor WBI, lead A in the described current occuring circuit passes current transformer LH, the end of current transformer LH connects the I+ end of current sensor WBI, the other end of current transformer LH connects the I-end of current sensor WBI, current sensor WBI+E end ,-the E end connects respectively+the 12V direct supply and-the 12V direct supply, the Ig end of current sensor LH and GND hold and are connected with control module.
More of the present invention and in specific embodiment, described input signal interface circuits comprises travel switch XK1～XK4 normally opened contact, resistance R 1～R12, contactor KM1 second auxiliary contact, time relay KT normally opened contact and photoelectrical coupler OC1, OC2, the end of the NO terminating resistor R1 of travel switch XK1,1 pin of another termination photoelectrical coupler OC1 of resistance R 1, the end of the 3 pin connecting resistance R2 of photoelectrical coupler OC1,4 pin of photoelectrical coupler OC1 connect the NO end of travel switch XK2, the end of the 5 pin connecting resistance R3 of photoelectrical coupler OC1, the NO end of another termination travel switch XK3 of resistance R 3, the end of the 7 pin connecting resistance R4 of photoelectrical coupler OC1,8 pin of photoelectrical coupler OC1 connect the NO end of travel switch XK4,10 pin of photoelectrical coupler OC1 are connected with an end of resistance R 10,12 pin of photoelectrical coupler OC1 are connected with an end of resistance R 9,14 pin of photoelectrical coupler OC1 are connected with an end of resistance R 8,16 pin of photoelectrical coupler OC1 are connected with an end of resistance R 7,1 pin of photoelectrical coupler OC2 is connected with an end of resistance R 5, the other end of resistance R 5 is connected with an end of contactor KM1 second auxiliary contact, 7 pin of photoelectrical coupler OC2 are connected with an end of resistance R 6, the other end of resistance R 6 is connected with an end of time relay KT normally opened contact, 10 pin of photoelectrical coupler OC2 are connected with an end of resistance R 12,16 pin of photoelectrical coupler OC2 are connected with an end of resistance R 11,10 of photoelectrical coupler OC1,12,14,10 of 16 pin and photoelectrical coupler OC2,16 pin also are connected with control module, the COM end of travel switch XK1, the other end of resistance R 2, the COM end of travel switch XK3, the other end of resistance R 4, the other end of the other end of contactor KM1 second auxiliary contact and time relay KT normally opened contact connects+the 24V direct supply jointly, the other end of resistance R 7～R12 connects+the 5V direct supply jointly, the COM end of travel switch XK2, the COM end of travel switch XK4,2 of photoelectrical coupler OC1,6,9,11,13,2 of 15 pin and photoelectrical coupler OC2,8,9,11,13,15 pin common grounds.
In of the present invention and then specific embodiment, described interface circuit of output signal comprises Darlington transistor array IC1, IC2 and relay ZJ1～ZJ10 coil, 1 of 1～8 pin of described Darlington transistor array IC1 and Darlington transistor array IC2,2 pin are connected with control module, 11～18 pin of Darlington transistor array IC1 respectively with relay ZJ8, ZJ7, ZJ6, ZJ5, ZJ4, ZJ3, ZJ2, one end of ZJ1 coil connects, 17 of Darlington transistor array IC2,18 pin respectively with relay ZJ10, one end of ZJ9 coil connects, the other end of relay ZJ1～ZJ10 coil, 10 pin of 10 pin of Darlington transistor array IC1 and Darlington transistor array IC2 connect+the 12V direct supply jointly, the 9 pin common grounds of 9 pin of Darlington transistor array IC1 and Darlington transistor array IC2.
Of the present invention again more and in specific embodiment, described stepper motor driving circuit comprises coarse adjustment pressure regulator stepper motor driver DRV1, fine setting pressure regulator stepper motor driver DRV2, coarse adjustment pressure regulator stepper motor MD1, fine setting pressure regulator stepper motor MD2 and travel switch XK1～XK4 normally closed contact, the coarse adjustment pressure regulator is connected with the NC end of travel switch XK1 with the VCC end of stepper motor driver DRV1, the coarse adjustment pressure regulator is connected the coarse adjustment pressure regulator A+ of stepper motor driver DRV1 with the GND end of stepper motor driver DRV1 with the NC end of travel switch XK2, A-, B+, the B-end is used the A+ of stepper motor MD1 respectively with the coarse adjustment pressure regulator, A-, B+, B-holds connection; The fine setting pressure regulator is connected with the NC end of travel switch XK3 with the VCC end of stepper motor driver DRV2, the fine setting pressure regulator is connected with the NC end of travel switch XK4 with the GND end of stepper motor driver DRV2, the fine setting pressure regulator A+ of stepper motor driver DRV2, A-, B+, the B-end is used the A+ of stepper motor MD2 respectively with the fine setting pressure regulator, A-, B+, B-holds connection, the coarse adjustment pressure regulator is held with the DIR of stepper motor driver DRV1, CP end and fine setting pressure regulator are held with the DIR of stepper motor driver DRV2, the CP end is connected with control module, the coarse adjustment pressure regulator is connected+the 5V direct supply with the OPTO end of fine setting pressure regulator with stepper motor driver DRV2 jointly with the OPTO end of stepper motor driver DRV1, travel switch XK1, the COM end of XK3 meets+the 24V direct supply travel switch XK2 jointly, the COM end common ground of XK4.
In again of the present invention and then specific embodiment, described control module is single-chip microcomputer or DSP (digital signal processing) microprocessor.
The present invention is owing to adopted above-mentioned technical pattern, compared with prior art, the beneficial effect that has is: 1. utilize stepper motor to drive coarse adjustment, fine setting pressure regulator, adjust the number of gating pulse according to the difference of detected electric current and setting value, thereby realize the accurate control to electric current; 2. detect meta tap and the meta voltage between the zero line and the output voltage between meta tap and the adjustable side of fine setting pressure regulator, by two voltages are carried out vector calculus, can accurately detect the present located position, adjustable side of finely tuning pressure regulator, reach the electric current adjusting for returning of fine setting pressure regulator is zero and created precondition; 3. coarse adjustment pressure regulator and fine setting pressure regulator all are provided with position limitation protection, avoid taking place pressure regulator causes device failure because of super range regulation situation; 4. the control mode of present design is flexible, and control module both can have been used single-chip microcomputer, DSP microprocessor, also can use main control computer and host computer etc.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Fig. 2 is the electrical connection graph of current occuring circuit of the present invention and meta signal deteching circuit.
Fig. 3 is the electrical schematic diagram of control commutation circuit of the present invention.
Fig. 4 is the electrical schematic diagram of current measurement circuit of the present invention.
Fig. 5 is the electrical schematic diagram of input signal interface circuits of the present invention.
Fig. 6 is the electrical schematic diagram of interface circuit of output signal of the present invention.
Fig. 7 is the electrical schematic diagram of stepper motor driving circuit of the present invention.
Embodiment
In order to make the public can fully understand technical spirit of the present invention and beneficial effect; the applicant will describe in detail the specific embodiment of the present invention below by reference to the accompanying drawings; but the applicant is not restriction to technical scheme to the description of embodiment, anyly makes form but not the variation of essence all should be considered as protection scope of the present invention according to the present invention's design.
See also Fig. 1, a kind of stair step current source, comprise current occuring circuit, stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit, interface circuit of output signal, control commutation circuit and control module, described control module and stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit and interface circuit of output signal connect, described current occuring circuit and stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit and control commutation circuit connect, and the control commutation circuit is connected with interface circuit of output signal.Described control module is single-chip microcomputer or DSP microprocessor.
See also Fig. 2, described current occuring circuit comprises contactor KM1 first, second main contacts, contactor KM2～KM10 main contacts, circuit breaker Q F1, coarse adjustment pressure regulator TD, fine setting pressure regulator TDW, fine setting transformer BTDW, autotransformer B1, B2 and low-voltage high-current transformer B3, described meta signal deteching circuit comprises voltage sensor WBV1, WBV2, in the present embodiment, described coarse adjustment pressure regulator TD adopts TDGC2-5KVA, fine setting pressure regulator TDW adopts TDGC2-1.0KVA, fine setting transformer BTDW adopts DB-1.0KVA, autotransformer B1, B2 adopts DB-5KVA, low-voltage high-current transformer B3 adopts DBL-5KVA, voltage sensor WBV1, WBV2 adopts WBV411U07-125V/5V.The L1 of the two input termination AC power of described circuit breaker Q F1, the N1 end, two output terminals of circuit breaker Q F1 are respectively by lead L2, N2 is connected with an end of contactor KM1 first main contacts and second main contacts, the other end of contactor KM1 first main contacts is connected with the end of coarse adjustment pressure regulator TD and the end of fine setting pressure regulator TDW by lead L3, the other end of contactor KM1 second main contacts is by the other end of lead N3 with fine setting pressure regulator TDW, the other end of coarse adjustment pressure regulator TD, autotransformer B1, the other end of the other end of B2 and low-voltage high-current transformer B3 primary coil connects, and is connected with the U-end of voltage sensor WBV1 in the meta signal deteching circuit.Voltage sensor WBV1, WBV2 are used for accurately detecting the present located position, adjustable side of fine setting pressure regulator TDW, particularly, voltage sensor WBV1 is for detection of the voltage between the zero line of the meta tap of finely tuning pressure regulator TDW and external ac power source, be meta voltage U 1, and be transferred to control module; Inductive drop sensor WBV2 is for detection of the meta tap of fine setting pressure regulator TDW and the voltage between the adjustable side, and namely output voltage U 2, are transferred to control module equally.By meta voltage U 1 and output voltage U 2 are done vector calculus, can judge the present located position, adjustable side of fine setting pressure regulator TDW, can learn whether the adjustable side has got back to the meta tap position simultaneously, namely whether returned zero.Particularly,
When
The time, the adjustable side of expression fine setting pressure regulator TDW is at the meta tap position;
When
The time, the adjustable side of expression fine setting pressure regulator TDW is above the meta tap;
When
The time, the adjustable side of expression fine setting pressure regulator TDW is below the meta tap.
When reality was used, lead A, X connected test product.When needs carry out the electric current adjusting, at first by coarse adjustment pressure regulator TD electric current is adjusted in certain error range of setting value permission, and then starts the accurate adjusting of the electric current do of fine setting pressure regulator TDW.Autotransformer B1, B2 are many tap transformers, and its output gear is bigger, can produce big measuring current, is used for enlarging the electric current range of adjustment.If measuring current is bigger, cause product heating easily, therefore need earlier to switch to again under the high multiple and slightly to finely tune at low multiple downward modulation economize on electricity stream, can shorten thus that electric current is regulated and product conduction time, the thermal value with the minimizing product reduces the wastage.The output voltage of low-voltage high-current transformer B3 is lower, but output current is big, can directly provide high-current supply to test product.
See also Fig. 3, described control commutation circuit comprises contactor KM1 coil, contactor KM1 first auxiliary contact, pilot lamp XD1, XD2 and pushbutton switch QA, TA1, TA, wherein, pilot lamp XD1 is used for general supply and cut-offs indication, adopts white light herein, pilot lamp XD2 is used for system and starts indication, adopt ruddiness herein, pushbutton switch QA is starting switch, keeps often opening, pushbutton switch TA1, TA are respectively shutdown switch and tight guard's valve, keep normally closed.The other end of the end of pilot lamp XD1, the other end of pushbutton switch QA and contactor KM1 first auxiliary contact connects the end of fuse 1RD1 jointly, the L1 end of another termination AC power of fuse 1RD1, the other end of the other end of pilot lamp XD1, contactor KM1 coil and the other end of pilot lamp XD2 connect the N1 end of AC power jointly, and this partial circuit is used for cut-offfing control and cut-offfing demonstration of general supply.When this current-source arrangement was connected L1, the N1 end of external ac power source, pilot lamp XD1 lighted.Press the button switch QA, pilot lamp XD2 lights, and while contactor KM1 coil gets electric, the contactor KM1 first auxiliary contact closure.First, second main contacts closure of contactor KM1 in the current occuring circuit, lead L3, N3 energising, current occuring circuit is started working.Described control commutation circuit also comprises relay ZJ1～ZJ10 normally opened contact, contactor KM2～KM10 coil and time relay KT coil, normally closed contact, the other end of relay ZJ1～ZJ10 normally opened contact connects the end of fuse 1RD2 jointly, the other end of fuse 1RD2 connects lead L3, the other end of contactor KM1 first main contacts in lead L3 and the current occuring circuit is connected, one end of time relay KT coil and the other end of normally closed contact connect lead N3, and the other end of second main contacts of the contactor KM1 in lead N3 and the current occuring circuit is connected.Relay ZJ1～ZJ10 normally opened contact is respectively applied to the power on/off of control time relay K T coil and contactor KM2～KM10 coil.Time relay KT is used for regularly protection of big electric current energising, behind big electric current output certain hour, and relay ZJ1 normally opened contact closure, time relay KT coil gets electric, and its normally closed contact disconnects, contactor KM2～KM10 coil blackout, big electric current output is interrupted.Contactor KM2～KM5 coil is used for the tap of autotransformer B1 selects 220V, 150V, 100V, the 70V tap of corresponding autotransformer B1 respectively.Contactor KM6～KM10 coil is used for the tap of autotransformer B2 selects 6 times, 2 times, 1.5 times, 1.2 times, the 1 times tap of corresponding autotransformer B2 respectively.
See also Fig. 4, described current measurement circuit comprises current transformer LH and current sensor WBI, and in the present embodiment, described current transformer LH adopts LMK3-0.66/80, and its no-load voltage ratio is 1200A/5V, and current sensor WBI adopts WBI411S97-5A/5V.Described current measurement circuit comes electric current on the lead A of induced flow in current occuring circuit by current transformer LH, and the current signal that records is exported to control module.
See also Fig. 5, described input signal interface circuits comprises travel switch XK1～XK4 normally opened contact, resistance R 1～R12, contactor KM1 second auxiliary contact, time relay KT normally opened contact and photoelectrical coupler OC1, OC2, in the present embodiment, described photoelectrical coupler OC1, OC2 adopt PC847, and described travel switch XK1～XK4 adopts KW123A250VAC.Travel switch XK1, XK2 are installed in the bound position of the coarse adjustment pressure regulator TD in the current occuring circuit respectively; the normally opened contact of travel switch XK1 is used for the upper limit protection of coarse adjustment pressure regulator TD, and the normally opened contact of travel switch XK2 is used for the lower limit protection of coarse adjustment pressure regulator TD.Travel switch XK3, XK4 are installed in the bound position of the fine setting pressure regulator TDW in the current occuring circuit respectively; the normally opened contact of travel switch XK3 is used for the upper limit protection of fine setting pressure regulator TDW, and the normally opened contact of travel switch XK4 is used for the lower limit protection of fine setting pressure regulator TDW.The bound position signalling of coarse adjustment pressure regulator TD and fine setting pressure regulator TDW is sent into control module through photoelectrical coupler OC1.In addition, when the contactor KM1 coil electricity in the control commutation circuit, contactor KM1 second auxiliary contact in this input signal interface circuits disconnects, and photoelectrical coupler OC2 carries the high level signal that corresponds to the general supply enabling signal to control module.When the time relay KT coil electricity in the control commutation circuit, the time relay KT normally opened contact closure in this input signal interface circuits, photoelectrical coupler OC2 carries the energising timeout signal to control module.Photoelectrical coupler OC2 also can send other control signals of test product into control module by 3～6 pin.Photoelectrical coupler OC1, OC2 play the signal buffer action, have improved the antijamming capability of circuit.
See also Fig. 6, described interface circuit of output signal comprises Darlington transistor array IC1, IC2 and relay ZJ1～ZJ10 coil, and in the present embodiment, described Darlington transistor array IC1, IC2 adopt ULN2803.Because the contactor coil electric current is bigger, and operating voltage is alternating current 220V, therefore can't directly drive by control module, herein, the signal of control module output is controlled the power on/off of time relay KT and contactor KM2～KM10 coil by the relay ZJ1～ZJ10 normally opened contact in the control commutation circuit through the power on/off that Darlington transistor array IC1, IC2 come pilot relay ZJ1～ZJ10 coil again.Particularly, the corresponding big electric current regulatory function of 1 pin of Darlington transistor array IC1,2～5 pin 220V, 150V, 100V, the 70V tap of corresponding autotransformer B1 are respectively selected, 6～8 pin 6 times, 2 times, the 1.5 times taps of corresponding autotransformer B1 are respectively selected, and 1,2 pin of Darlington transistor array IC2 1.2 times, the 1.0 times taps of corresponding autotransformer B2 are respectively selected.
See also Fig. 7, described stepper motor driving circuit comprises coarse adjustment pressure regulator stepper motor driver DRV1, fine setting pressure regulator stepper motor driver DRV2, coarse adjustment pressure regulator stepper motor MD1, fine setting pressure regulator stepper motor MD2 and travel switch XK1～XK4 normally closed contact, in the present embodiment, described coarse adjustment pressure regulator adopts SH2H042Mb with stepper motor driver DRV1 and fine setting pressure regulator with stepper motor driver DRV2.The coarse adjustment pressure regulator is pulse input end with stepper motor driver DRV1 and fine setting pressure regulator with the CP of stepper motor driver DRV2 end, and the number of pulses of input determines the angle that stepper motor turns over, the rotating speed of the frequency decision stepper motor of pulse.In the present embodiment, the pulse input of CP end is controlled by control module.
Please consulting Fig. 1～Fig. 7 again, is that to be example describe the principle of work of present design 1000A with required measuring current.Before system's energising, the adjustable side of coarse adjustment pressure regulator TD remains on reference position, and the adjustable side of fine setting pressure regulator TDW remains on the meta tap position, and namely coarse adjustment pressure regulator TD and fine setting pressure regulator TDW have finished back Z-operation.Behind the start-up system power supply, control module detects back zero-signal, and at first by the 2 pin output high level of control module to Darlington transistor array IC1, relay ZJ2 gets electric closure, contactor KM2 coil gets electric, and its main contacts closure makes the 220V tap of autotransformer B1 be communicated with.Meanwhile, control module is to the 1 pin output high level of Darlington transistor array IC2, relay ZJ9 gets electric closure, contactor KM9 coil gets, its main contacts closure makes 1.2 times of taps of autotransformer B2 be communicated with, then, control module is to the DIR end output low level of coarse adjustment pressure regulator with stepper motor driver DRV1, set the coarse adjustment pressure regulator with stepper motor MD1 for just changeing, then control module makes the coarse adjustment pressure regulator just change with stepper motor MD1 to the CP end output pulse signal of coarse adjustment pressure regulator with stepper motor driver DRV1.In this process, the output voltage of low-voltage high-current transformer B3 rises gradually, output current progressively increases, when electric current is adjusted to 200A ± 3.0%, control module is to the 1 pin output low level of Darlington transistor array IC2, relay ZJ9 dead electricity disconnects, and contactor KM9 coil losing electricity, its main contacts disconnect and make 1.2 times of taps of autotransformer B2 disconnect.At this moment, control module is to the 6 pin output high level of Darlington transistor array IC1, and relay ZJ6 gets electric closure, and contactor KM6 coil gets, its main contacts closure makes 6 times of taps of autotransformer B2 be communicated with, and low-voltage high-current transformer B3 output current becomes 1000A ± 3.0%.Current measurement circuit is gathered the output current of low-voltage high-current transformer B3 by current transformer LH, WBI flows to control module through current sensor, control module to the fine setting pressure regulator with the DIR end output of stepper motor driver DRV2 to high level or low level signal that should current signal, be used for control fine setting pressure regulator turning to stepper motor MD2, simultaneously also to the CP end output corresponding pulse signal of fine setting pressure regulator with stepper motor driver DRV2, be used for the angular dimension that control fine setting pressure regulator rotates with stepper motor MD2, thereby the output current of low-voltage high-current transformer B3 is adjusted in the permissible accuracy scope.In above-mentioned adjustment process; when big electric current reaches setting value conduction time; control module is to the 1 pin output high level of Darlington transistor array IC1; relay ZJ1 gets electric closure; time relay KT coil gets; its normally closed contact disconnects and makes contactor KM2～KM10 coil losing electricity, and main contacts separately disconnects, and carries out protection conduction time of big electric current.
Work as end of test (EOT), the meta signal deteching circuit detects meta voltage U 1 and the output voltage U 2 of fine setting pressure regulator TDW, control module is judged the present located position, adjustable side of fine setting pressure regulator TDW according to meta voltage U 1 and output voltage U 2, and control fine setting pressure regulator rotates towards respective direction with stepper motor MD2, stops when the meta tap position is got back in the adjustable side of finely tuning pressure regulator TDW.Simultaneously, control module is also controlled the coarse adjustment pressure regulator and is reversed with stepper motor MD1, and the coarse adjustment pressure regulator stops operating with stepper motor MD1 when reference position is got back in the adjustable side of coarse adjustment pressure regulator TD.
Claims (9)
1.
A kind of stair step current source, comprise current occuring circuit, stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit, interface circuit of output signal, control commutation circuit and control module, described control module and stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit and interface circuit of output signal connect, described current occuring circuit and stepper motor driving circuit, the meta signal deteching circuit, input signal interface circuits, current measurement circuit and control commutation circuit connect, and the control commutation circuit is connected with interface circuit of output signal.
2.
Stair step current according to claim 1 source, it is characterized in that described current occuring circuit comprises contactor KM1 first, second main contacts, contactor KM2～KM10 main contacts, circuit breaker Q F1, coarse adjustment pressure regulator TD, fine setting pressure regulator TDW, fine setting transformer BTDW, autotransformer B1, B2 and low-voltage high-current transformer B3, wherein, coarse adjustment pressure regulator TD adopts TDGC2-5KVA, fine setting pressure regulator TDW adopts TDGC2-1.0KVA, fine setting transformer BTDW adopts DB-1.0KVA, autotransformer B1, B2 adopts DB-5KVA, low-voltage high-current transformer B3 adopts DBL-5KVA, the L1 of the two input termination AC power of described circuit breaker Q F1, the N1 end, two output terminals of circuit breaker Q F1 are connected with an end of contactor KM1 first main contacts and second main contacts respectively, the other end of contactor KM1 first main contacts is connected with the end of coarse adjustment pressure regulator TD and the end of fine setting pressure regulator TDW, the adjustable side of coarse adjustment pressure regulator TD is connected with an end of fine setting transformer BTDW secondary coil, one end of fine setting transformer BTDW primary coil is connected with the adjustable side of fine setting pressure regulator TDW, and be connected with the U+ end of voltage sensor WBV2 in the meta signal deteching circuit, the other end of fine setting transformer BTDW primary coil is connected with the meta tap of fine setting pressure regulator TDW, and hold with the U-of the U+ end of voltage sensor WBV1 in the meta signal deteching circuit and voltage sensor WBV2 and to be connected, the other end of fine setting transformer BTDW secondary coil is connected with the end of autotransformer B1, the 220V of autotransformer B1,150V, 100V, the 70V tap respectively with contactor KM2, KM3, KM4, one end of the main contacts of KM5 connects, contactor KM2, KM3, KM4, the other end of KM5 main contacts is connected with the end of autotransformer B2,6 times of autotransformer B2,2 times, 1.5 doubly, 1.2 doubly, 1 times of tap respectively with contactor KM6, KM7, KM8, KM9, one end of KM10 main contacts connects, contactor KM6, KM7, KM8, KM9, the other end of KM10 main contacts is connected with an end of low-voltage high-current transformer B3 primary coil, one end of low-voltage high-current transformer B3 secondary coil connects lead A, lead A passes the current transformer LH in the current measurement circuit, the other end of low-voltage high-current transformer B3 secondary coil connects lead X, the other end of fine setting pressure regulator TDW, the other end of coarse adjustment pressure regulator TD, autotransformer B1, the other end of the other end of B2 and low-voltage high-current transformer B3 primary coil is connected with the other end of contactor KM1 second main contacts jointly, and is connected with the U-end of voltage sensor WBV1 in the meta signal deteching circuit.
3.
Stair step current according to claim 1 source, it is characterized in that described meta signal deteching circuit comprises voltage sensor WBV1, WBV2, wherein, voltage sensor WBV1, WBV2 adopts WBV411U07-125V/5V, the Vg end of voltage sensor WBV1, the Vg end of GND end and voltage sensor WBV2, the GND end is connected with control module, the U+ of voltage sensor WBV1, the U-end, the U+ of voltage sensor WBV2, the U-end is connected with current occuring circuit, voltage sensor WBV1, WBV2+E end is connected to+the 12V direct supply voltage sensor WBV1 jointly, WBV2-E end is connected to-the 12V direct supply jointly.
4.
Stair step current according to claim 1 source, it is characterized in that described control commutation circuit comprises contactor KM1 coil, contactor KM1 first auxiliary contact, pilot lamp XD1, XD2 and pushbutton switch QA, TA1, TA, the end of described pushbutton switch QA is connected with an end of contactor KM1 first auxiliary contact and the end of pushbutton switch TA1, the other end of pushbutton switch TA1 is connected with the end of pushbutton switch TA, the other end of pushbutton switch TA is connected with an end of contactor KM1 coil and the end of pilot lamp XD2, the end of pilot lamp XD1, the other end of pushbutton switch QA, the other end of contactor KM1 first auxiliary contact connects the L1 end of AC power, the other end of pilot lamp XD1 jointly, the other end of contactor KM1 coil and the other end of pilot lamp XD2 connect the N1 end of AC power jointly; Described control commutation circuit also comprises relay ZJ1～ZJ10 normally opened contact, contactor KM2～KM10 coil and time relay KT coil, normally closed contact, one end of described relay ZJ2～ZJ10 normally opened contact is connected with an end of contactor KM2～KM10 coil respectively, the other end of contactor KM2～KM10 coil is connected with an end of time relay KT normally closed contact, one end of relay ZJ1 normally opened contact is connected with an end of time relay KT coil, the other end of relay ZJ1～ZJ10 normally opened contact connects lead L3 jointly, the other end of first main contacts of the contactor KM1 in lead L3 and the current occuring circuit is connected, the other end of time relay KT coil, the other end of normally closed contact connects lead N3 jointly, and the other end of second main contacts of the contactor KM1 in lead N3 and the current occuring circuit is connected.
5.
Stair step current according to claim 1 source, it is characterized in that described current measurement circuit comprises current transformer LH and current sensor WBI, wherein, current transformer LH adopts LMK3-0.66/80, current sensor WBI adopts WBI411S97-5A/5V, lead A in the described current occuring circuit passes current transformer LH, the end of current transformer LH connects the I+ end of current sensor WBI, the other end of current transformer LH connects the I-end of current sensor WBI, current sensor WBI+the E end,-E end connects respectively+the 12V direct supply and-the 12V direct supply, the Ig end of current sensor LH and GND hold and are connected with control module.
6.
Stair step current according to claim 1 source, it is characterized in that described input signal interface circuits comprises travel switch XK1～XK4 normally opened contact, resistance R 1～R12, contactor KM1 second auxiliary contact, time relay KT normally opened contact and photoelectrical coupler OC1, OC2, wherein, photoelectrical coupler OC1, OC2 adopts PC847, described travel switch XK1～XK4 adopts KW12 3A250VAC, the end of the NO terminating resistor R1 of travel switch XK1,1 pin of another termination photoelectrical coupler OC1 of resistance R 1, the end of the 3 pin connecting resistance R2 of photoelectrical coupler OC1,4 pin of photoelectrical coupler OC1 connect the NO end of travel switch XK2, the end of the 5 pin connecting resistance R3 of photoelectrical coupler OC1, the NO end of another termination travel switch XK3 of resistance R 3, the end of the 7 pin connecting resistance R4 of photoelectrical coupler OC1,8 pin of photoelectrical coupler OC1 connect the NO end of travel switch XK4,10 pin of photoelectrical coupler OC1 are connected with an end of resistance R 10,12 pin of photoelectrical coupler OC1 are connected with an end of resistance R 9,14 pin of photoelectrical coupler OC1 are connected with an end of resistance R 8,16 pin of photoelectrical coupler OC1 are connected with an end of resistance R 7,1 pin of photoelectrical coupler OC2 is connected with an end of resistance R 5, the other end of resistance R 5 is connected with an end of contactor KM1 second auxiliary contact, 7 pin of photoelectrical coupler OC2 are connected with an end of resistance R 6, the other end of resistance R 6 is connected with an end of time relay KT normally opened contact, 10 pin of photoelectrical coupler OC2 are connected with an end of resistance R 12,16 pin of photoelectrical coupler OC2 are connected with an end of resistance R 11,10 of photoelectrical coupler OC1,12,14,10 of 16 pin and photoelectrical coupler OC2,16 pin are connected with control module, the COM end of travel switch XK1, the other end of resistance R 2, the COM end of travel switch XK3, the other end of resistance R 4, the other end of the other end of contactor KM1 second auxiliary contact and time relay KT normally opened contact connects+the 24V direct supply jointly, the other end of resistance R 7～R12 connects+the 5V direct supply jointly, the COM end of travel switch XK2, the COM end of travel switch XK4,2 of photoelectrical coupler OC1,6,9,11,13,2 of 15 pin and photoelectrical coupler OC2,8,9,11,13,15 pin common grounds.
7.
Stair step current according to claim 1 source, it is characterized in that described interface circuit of output signal comprises Darlington transistor array IC1, IC2 and relay ZJ1～ZJ10 coil, wherein, Darlington transistor array IC1, IC2 adopts ULN2803,1 of 1～8 pin of described Darlington transistor array IC1 and Darlington transistor array IC2,2 pin are connected with control module, 11～18 pin of Darlington transistor array IC1 respectively with relay ZJ8, ZJ7, ZJ6, ZJ5, ZJ4, ZJ3, ZJ2, one end of ZJ1 coil connects, 17 of Darlington transistor array IC2,18 pin respectively with relay ZJ10, one end of ZJ9 coil connects, the other end of relay ZJ1～ZJ10 coil, 10 pin of 10 pin of Darlington transistor array IC1 and Darlington transistor array IC2 connect+the 12V direct supply jointly, the 9 pin common grounds of 9 pin of Darlington transistor array IC1 and Darlington transistor array IC2.
8.
Stair step current according to claim 1 source, it is characterized in that described stepper motor driving circuit comprises coarse adjustment pressure regulator stepper motor driver DRV1, fine setting pressure regulator stepper motor driver DRV2, coarse adjustment pressure regulator stepper motor MD1, fine setting pressure regulator stepper motor MD2 and travel switch XK1～XK4 normally closed contact, wherein, the coarse adjustment pressure regulator adopts SH2H042Mb with stepper motor driver DRV1 and fine setting pressure regulator with stepper motor driver DRV2, the coarse adjustment pressure regulator is connected with the NC end of travel switch XK1 with the VCC end of stepper motor driver DRV1, the coarse adjustment pressure regulator is connected the coarse adjustment pressure regulator A+ of stepper motor driver DRV1 with the GND end of stepper motor driver DRV1 with the NC end of travel switch XK2, A-, B+, the B-end is used the A+ of stepper motor MD1 respectively with the coarse adjustment pressure regulator, A-, B+, B-holds connection; The fine setting pressure regulator is connected with the NC end of travel switch XK3 with the VCC end of stepper motor driver DRV2, the fine setting pressure regulator is connected with the NC end of travel switch XK4 with the GND end of stepper motor driver DRV2, the fine setting pressure regulator A+ of stepper motor driver DRV2, A-, B+, the B-end is used the A+ of stepper motor MD2 respectively with the fine setting pressure regulator, A-, B+, B-holds connection, the coarse adjustment pressure regulator is held with the DIR of stepper motor driver DRV1, CP end and fine setting pressure regulator are held with the DIR of stepper motor driver DRV2, the CP end is connected with control module, the coarse adjustment pressure regulator is connected+the 5V direct supply with the OPTO end of fine setting pressure regulator with stepper motor driver DRV2 jointly with the OPTO end of stepper motor driver DRV1, travel switch XK1, the COM end of XK3 meets+the 24V direct supply travel switch XK2 jointly, the COM end common ground of XK4.
9.
Stair step current according to claim 1 source is characterized in that described control module is single-chip microcomputer or DSP microprocessor
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