CN104656730B - Dual path isolation constant-current type numerical-control direct-current power source - Google Patents
Dual path isolation constant-current type numerical-control direct-current power source Download PDFInfo
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- CN104656730B CN104656730B CN201410769755.8A CN201410769755A CN104656730B CN 104656730 B CN104656730 B CN 104656730B CN 201410769755 A CN201410769755 A CN 201410769755A CN 104656730 B CN104656730 B CN 104656730B
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Abstract
The invention discloses a kind of dual path isolation constant-current type numerical-control direct-current power source, the cathode output end of the first main out-put supply module connects A/D change-over circuit, cathode output end gathers amplifying circuit by first and connects A/D change-over circuit, the cathode output end of the second main out-put supply module connects A/D change-over circuit by voltage isolation transfer circuit, cathode output end gathers amplifying circuit by second successively, electric current isolation transfer circuit connects A/D change-over circuit, described A/D change-over circuit connects CPU (central processing unit), the current controling signal output terminal of CPU (central processing unit) connects the first power supply output control circuit by D/A change-over circuit, second source output control circuit is connected by control signal isolation transfer circuit, described first, second source output control circuit connects first respectively, the Voltage Cortrol end of the second main out-put supply module.The present invention adopts the voltage way of output of constant-current type, and make precision want high, track stability will be got well, and meets manufacturing technique requirent, and solves heat dissipation problem.
Description
Technical field
The present invention relates to two-way direct current power supply, particularly relate to a kind of dual path isolation constant-current type numerical-control direct-current power source mainly applying to sand equipment on micrometer diamond line.
Background technology
At present, micrometer diamond line is mainly used in the cutting work of silicon chip of solar cell, in the production run of micrometer diamond line, the upper quality of sand part to direct supply has very high performance requirement, major requirement multi-channel dc power supply exports as constant current output, refer to when load changes, and the variation of the voltage follow load at load two ends and changing, allow the current value of the electric current that passes through in load and setting keep certain all the time.
Because the micrometer diamond line production cycle is longer, in production run can not there is any exception in the direct supply of upper sand equipment, once occur abnormal, will cause very large impact, therefore, require that the performance of power supply is extremely stable to product.And the power supply that market meets this requirement is also few, the power supply that industry uses is a kind of linear DC power supply of digital-control type multiple-channel output, this power supply is mainly used in the cleaner environment such as laboratory when designing, due to the production environment more complicated of micrometer diamond line, power supply is close to the liquid of various heating.Due to the effect of power supply heat sinking fan, the steam of liquid will enter power source internal along with fan, and will deposit on the circuit of power supply and radiator fan after liquid vapour cooling, a lot of fault is caused to power supply, as various liquid has corrosion and short circuit harm to wiring board, and power acquisition linear design, work efficiency is very low, very large heat can be produced, mainly dispel the heat by radiator fan, liquid deposits can cause fan to get stuck, fan blade can not rotate, internal heat can not distribute, cause power circuit temperature too high and initiation temperature is reported to the police, power supply has just quit work, produce and just cannot proceed, therefore the security performance replanting power supply is nowhere near.
Summary of the invention
The object of this invention is to provide a kind of dual path isolation constant-current type numerical-control direct-current power source, good heat dissipation, precision are higher, working stability.
The present invention adopts following technical proposals: a kind of dual path isolation constant-current type numerical-control direct-current power source, include DC voltage generation circuit, first main out-put supply module and the second main out-put supply module, CPU (central processing unit), first power supply output control circuit, second source output control circuit, first gathers amplifying circuit, second gathers amplifying circuit, the positive pole of the described first main out-put supply module and the second main out-put supply module, cathode output end connects the first load and the second load respectively, the cathode output end of the first main out-put supply module connects A/D change-over circuit, the cathode output end of the first main out-put supply module gathers amplifying circuit by first and connects A/D change-over circuit, the cathode output end of the second main out-put supply module connects A/D change-over circuit by voltage isolation transfer circuit, the cathode output end of the second main out-put supply module gathers amplifying circuit by second successively, electric current isolation transfer circuit connects A/D change-over circuit, the output terminal of described A/D change-over circuit connects the collection signal input end of CPU (central processing unit), the current controling signal output terminal of CPU (central processing unit) connects D/A change-over circuit, first output terminal of D/A change-over circuit connects the first power supply output control circuit, second output terminal connects second source output control circuit by control signal isolation transfer circuit, the first described power supply output control circuit, second source output control circuit connects the Voltage Cortrol end of the first main out-put supply module and the second main out-put supply module respectively, the output of the described first main out-put supply module and the second main out-put supply module is not altogether, described DC voltage generation circuit is respectively each circuit module and powers.
The input end of described CPU (central processing unit) is connected with controling parameters initialization circuit, and the cue output terminal of described CPU (central processing unit) is connected with the hummer sound circuit for pointing out operation controling parameters initialization circuit; The output terminal of CPU (central processing unit) is connected with display circuit.
The data transmit-receive end of described CPU (central processing unit) is connected with the memory circuit for storage power running parameter, state and password, and the communication ends of described CPU (central processing unit) is connected with for carrying out with peripherals the telecommunication circuit that communicates.
Described first main out-put supply module and the second main out-put supply module adopt enclosed construction, and the first main out-put supply module and the second main out-put supply module-external are fastened with aluminium shell.
Described first gathers amplifying circuit includes inverting amplifier, zeroing circuit, enlargement factor regulating circuit, the inverting input of described inverting amplifier is the input end of the first collection amplifying circuit, zeroing circuit includes the first adjustable resistance and the first resistance, the two ends of the first adjustable resistance connect cathode voltage end and the negative electricity pressure side of DC voltage generation circuit respectively, and the adjustable side of the first adjustable resistance connects the inverting input of inverting amplifier by the first resistance; Enlargement factor regulating circuit includes the second resistance and the second adjustable resistance, one end of second adjustable resistance is connected the output terminal of inverting amplifier with adjustable end, the other end connects the inverting input of inverting amplifier by the second resistance, and the output terminal of inverting amplifier is the output terminal of the first collection amplifying circuit;
The structure that the second described collection amplifying circuit and first gathers amplifying circuit is identical, second input end gathering amplifying circuit connects the cathode output end of the second main out-put supply module, and the second output terminal gathering amplifying circuit connects the input end of electric current isolation transfer circuit.
The first described power supply output control circuit includes the first comparator circuit, capacitor charge and discharge circuit, zero current control circuit and voltage buffer, the inverting input of the first described comparator circuit connects the first output terminal of D/A change-over circuit by controlling calibration circuit, the in-phase input end of the first comparator circuit connects the output terminal that first gathers amplifying circuit, and the output terminal of the first comparator circuit connects the input end of capacitor charge and discharge circuit; Capacitor charge and discharge circuit includes the first diode, triode, electric capacity, the positive pole of the first diode and the input end of capacitor charge and discharge circuit, the base stage of the negative pole connecting triode of the first diode, collector connects power supply, collector and emitter connects electric capacity two ends, grounded emitter; Collector also connects the in-phase input end of voltage buffer, connects ground connection after the first bleeder circuit, the tie point i.e. output terminal of the first power supply output control circuit of two resistance of the first bleeder circuit after the inverting input of voltage buffer is connected with output terminal;
Zero current control circuit includes the second bleeder circuit, the second comparator circuit, second bleeder circuit connects the output terminal that first gathers amplifying circuit, the tie point of two resistance of the second bleeder circuit connects the end of oppisite phase of the second comparator circuit, the in-phase input end of the second comparator circuit connects the first output terminal of D/A change-over circuit by controlling calibration circuit, the output terminal of the second comparator circuit passes through the base stage of the second diode connecting triode; Described second source output control circuit is identical with the structure of the first power supply output control circuit.
Described voltage isolation transfer circuit includes precision photoelectric coupler, voltage calibration circuit and differential amplifier circuit, voltage calibration circuit includes the 3rd resistance, 3rd adjustable resistance, 4th resistance, the first end of the 3rd resistance is the input end of voltage isolation circuit, second end of the 3rd resistance passes through the first input end of the 3rd adjustable resistance connecting linear photoelectrical coupler, the second input end of the 4th resistance connecting linear photoelectrical coupler is passed through in the adjustable side of the 3rd adjustable resistance, filter capacitor is connected with between two input ends, two output terminals of precision photoelectric coupler connect two input ends of differential amplifier circuit, the output terminal of the output terminal of differential amplifier circuit and voltage isolation transfer circuit, described electric current isolation transfer circuit is identical with the structure that voltage isolates transfer circuit.
Described control signal isolation transfer circuit is identical with the structure that voltage isolates transfer circuit, the input end of control signal isolation transfer circuit connects the second output terminal of D/A change-over circuit, and the output terminal of control signal isolation transfer circuit connects the input end of second source output control circuit.
Described controling parameters initialization circuit includes string and turns and the output circuit that is shifted, eight lines and three alignments, point of crossing is welded with microswitch with ranks line, the signal output part of CPU (central processing unit) is turned by string and the output circuit that is shifted connects eight lines, and three described alignments are directly connected with CPU (central processing unit).
Described DC voltage generation circuit includes transformer, buffer circuit power circuit and main circuit power circuit, the elementary connection 220VAC of described transformer, the power input of elementary also out-put supply module main with first and the second main out-put supply module is connected; Secondary connection buffer circuit power circuit and main circuit power circuit simultaneously; Described buffer circuit power circuit includes: current rectifying and wave filtering circuit, mu balanced circuit, transforming circuit, the input end of described current rectifying and wave filtering circuit is connected with the secondary of transformer, the output terminal of current rectifying and wave filtering circuit connects the first mu balanced circuit, the second mu balanced circuit respectively, the output terminal of the first mu balanced circuit, the second mu balanced circuit exports+12V ,-12V respectively, the output terminal of the first described mu balanced circuit is connected with transforming circuit, transforming circuit output+5V; Described main circuit power circuit is identical with the structure of buffer circuit power circuit.
The present invention has following technique effect:
The first, the present invention adopts the two-way electric current adjustment circuit of isolation, detects in real time, according to the result detected, carry out output adjustment in real time, remain that the electric current in two-way load is in steady state (SS) to two switch power modules doubleway output electric current.The voltage way of output of constant-current type, make precision want high, track stability will be got well, and meets manufacturing technique requirent.
The second, two output voltage is mutually isolated, adopts two-way to export not mode altogether, is applicable to complex environment.
Three, setting parameter is convenient, and liquid crystal display shows running parameter, can arrange easily running parameter and change, bring great convenience to the operability of power supply;
Utilize storer to remember the parameter such as duty and password, output state has memory function, can be determined the output state of incoming call by setting memory style.During work, sometimes electrical network there will be transient fluctuation, and the micro computer part that power supply itself controls will reset and stop output voltage, if power acquisition output state memory function, power supply will continue to keep the last parameter run upon actuation, do not need to re-start optimum configurations, the pause of production can not be caused;
Power supply itself possesses 485 communication functions, external unit can be utilized to operate power supply and the inter-related task such as digital independent.
Four, the present invention's switch power module of adopting thermal value little, utilizes large-area aluminium shell as heat radiator, does not adopt radiator fan, and power source internal adopts enclosed construction with outside, can prevent the liquid vapour of outside from entering into power source internal like this.This power supply can not allow liquid vapour enter power source internal when dispelling the heat, in order to avoid power circuit is damaged, causes job insecurity.Because the load current of upper sand equipment is also little, the efficiency of switch power module is very high, and the heat of generation will be very little, and the heat of power source internal will soon be distributed by heat-dissipating casing.
Five, work efficiency is higher, can saves energy.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the circuit theory diagrams of DC voltage generation circuit of the present invention, first, second main out-put supply module;
Fig. 3 is the circuit theory diagrams of the first Acquisition Circuit of the present invention, the first power supply output control circuit;
Fig. 4 is the circuit theory diagrams of the second Acquisition Circuit of the present invention, second source output control circuit
Fig. 5 is the circuit theory diagrams of each circuit of CPU (central processing unit) of the present invention and connection.
Embodiment
As shown in Figure 1, the invention discloses a kind of dual path isolation constant-current type numerical-control direct-current power source, include DC voltage generation circuit, first main out-put supply module and the second main out-put supply module, CPU (central processing unit), first power supply output control circuit, second source output control circuit, first gathers amplifying circuit, second gathers amplifying circuit, the positive pole of the described first main out-put supply module and the second main out-put supply module, cathode output end connects the first load and the second load respectively, the cathode output end of the first main out-put supply module connects A/D change-over circuit, the cathode output end of the first main out-put supply module gathers amplifying circuit by first and connects A/D change-over circuit, the cathode output end of the second main out-put supply module connects A/D change-over circuit by voltage isolation transfer circuit, the cathode output end of the second main out-put supply module gathers amplifying circuit by second successively, electric current isolation transfer circuit connects A/D change-over circuit, the output terminal of described A/D change-over circuit connects the collection signal input end of CPU (central processing unit), the current controling signal output terminal of CPU (central processing unit) connects D/A change-over circuit, first output terminal of D/A change-over circuit connects the first power supply output control circuit, second output terminal connects second source output control circuit by control signal isolation transfer circuit, the first described power supply output control circuit, second source output control circuit connects the Voltage Cortrol end of the first main out-put supply module and the second main out-put supply module respectively, described DC voltage generation circuit is respectively each circuit module and powers.The input end of described CPU (central processing unit) is connected with controling parameters initialization circuit, and the output terminal of CPU (central processing unit) is connected with display circuit; The data transmit-receive end of described CPU (central processing unit) is connected with the memory circuit for storage power running parameter, state and password, and the communication ends of described CPU (central processing unit) is connected with for carrying out with peripherals the telecommunication circuit that communicates.
As shown in Figure 2, described DC voltage generation circuit includes transformer T1, buffer circuit power circuit and main circuit power circuit, the voltage of alternating current 220V is by being divided into two-way after power switch S1 and fuse F1, one tunnel is supplied to two main output module circuit, and an other road is supplied to power transformer T1.The elementary connection 220VAC of described transformer T1, the power input (L, N) of elementary also out-put supply module main with first and the second main out-put supply module (model is: HCPS-150-24KT) is connected; Secondary connection buffer circuit power circuit and main circuit power circuit simultaneously, transformer T1 is that alternating current 220V becomes four interchange 14V voltages, and be divided into two groups, each group has common port, and two groups of alternating voltages are mutually isolated.Described buffer circuit power circuit includes: current rectifying and wave filtering circuit, mu balanced circuit, transforming circuit, described current rectifying and wave filtering circuit (includes diode D5-D8, filter capacitor C33, C34) input end is connected with the secondary of transformer T1, the output terminal of current rectifying and wave filtering circuit obtains the DC voltage of a positive and negative 16V, connect the first mu balanced circuit U16 respectively, second mu balanced circuit U18, first mu balanced circuit U16, the output terminal of the second mu balanced circuit U18 exports+12Va respectively,-12Va, the output terminal of the first described mu balanced circuit U16 is connected with transforming circuit U17, transforming circuit U17 output+5Va.Described buffer circuit power circuit is used for powering to buffer circuit.
Described main circuit power circuit is identical with the structure of buffer circuit power circuit, and main circuit power circuit exports+12V ,-12V ,+5V three kinds of DC voltage, for powering to main control loop.
The shell of the described first main out-put supply module and the second main out-put supply module is aluminium, it is the main heat radiator of this module, shell is all tightly fixed on module housing, the heat allowing module produce leads outside by housing, thus ensure that the temperature of power source internal can not be very high, allow the work that power supply can be stable.On each module, have 6 terminals, wherein two terminals are alternating current 220V voltage input end, and a terminal is earth terminal PE, power source internal all PE end be all connected with outer casing of power supply.Module has two output terminal OUT+/OUT-, and this output terminal is the feeder ear of apparatus of load.Module also has one to adjust end ADJ, by the control voltage of the adjustment end ADJ of control module, just can realize the object that module changes output voltage.The model of switch power module is HCPS-150-24KT, and parameter is power is 150 watts, and output voltage range of adjustment is 0--24V.Resistance R25, R26 are respectively the current sampling resistor of two current supply circuits, when module output current, electric current is through sample resistance, voltage drop will be produced on resistance, the numerical value of size of current is directly proportional to the pressure drop numerical value of resistance, just can know the current values of apparatus of load by the voltage drop of measuring above sample resistance.It should be noted that, the output of two modules is not altogether, mutually isolated.
As shown in Figure 3, described first gathers amplifying circuit includes inverting amplifier U1C, zeroing circuit, enlargement factor regulating circuit, the inverting input of described inverting amplifier U1C is the input end of the first collection amplifying circuit, connect OUTA-, R3 is current-limiting resistance, zeroing circuit includes the first adjustable resistance RW1 and the first resistance R1, the two ends of the first adjustable resistance RW1 connect cathode voltage end+12V and the negative electricity pressure side-12V of DC voltage generation circuit respectively, the adjustable side of the first adjustable resistance RW1 connects the inverting input of inverting amplifier by the first resistance R1, play effect amplifier being exported to zeroing.Enlargement factor regulating circuit includes the second resistance R2 and the second adjustable resistance RW2, one end of second adjustable resistance RW2 is connected the output terminal of inverting amplifier U1C with adjustable end, the other end connects the inverting input of inverting amplifier by the second resistance R2, the output terminal of inverting amplifier U1C is the output terminal of the first collection amplifying circuit, connects the input end (pin 1) of A/D change-over circuit U13.When the first main out-put supply module output current, a small voltage value be directly proportional to current values will be produced on current-limiting resistance R25, this voltage value is delivered to the inverting input of inverting amplifier U1C through resistance R4, adjustable resistance RW1 and resistance R1 forms zeroing circuit, regulate RW1 can make when input end input signal is 0, output signal voltage is also 0.Adjustable resistance RW2 is for regulating the enlargement factor of this amplifier, RW2 is regulated to make the multiplying power of amplifier be 50 times, namely when the first main out-put supply module output current is 1A, resistance can produce the voltage of 0.01V, inverting amplifier U1C just has the voltage exporting 0.5V.The effect of electric capacity C1 makes amplification output more steady.
As shown in Fig. 3, Fig. 5, the first described power supply output control circuit includes the first comparator circuit U1A, capacitor charge and discharge circuit, zero current control circuit and voltage buffer, the inverting input of the first described comparator circuit U1A connects the first output terminal of D/A change-over circuit by controlling calibration circuit, i.e. U4(TLC5615) signal output part, control calibration circuit be made up of adjustable resistance RW5 and electric capacity C7.The in-phase input end of the first comparator circuit U1A connects the output terminal that first gathers amplifying circuit, and the output terminal of the first comparator circuit U1A connects the input end of capacitor charge and discharge circuit; Capacitor charge and discharge circuit includes the first diode D1, triode Q1, electric capacity C3, the positive pole of the first diode D1 and the input end of capacitor charge and discharge circuit, the negative pole of the first diode D1 passes through the base stage of resistance R7 connecting triode Q1, collector connects power supply+12V by R9, collector and emitter connects electric capacity C3 two ends, grounded emitter; Collector also connects the in-phase input end of voltage buffer U1B, ground connection after the first bleeder circuit is connected after the inverting input of voltage buffer U1B is connected with output terminal, the tie point i.e. output terminal OUTAADJ of the first power supply output control circuit of two resistance R11, R12 of the first bleeder circuit, exports the Voltage Cortrol end of the first primary power control module to.First comparator circuit U1A be by load A above working current with setting electric current compare, and set the output voltage of numerical value from DA change-over circuit of electric current, when output current is greater than setting electric current, comparer will export high level, otherwise will output low level.Result is relatively passed to capacitor charge and discharge circuit.In capacitor charge and discharge circuit, the effect of diode D1 is front stage isolation, avoids the impact produced between circuit at different levels.R7 is current-limiting resistance, when the first comparator circuit U1A output low level, triode Q1 ends, 12V voltage is charged to electric capacity C13 by resistance R9, R10, the voltage at electric capacity two ends will raise, the voltage at electric capacity two ends is connected to the control end of the first main out-put supply module by the buffer action of voltage buffer, the output voltage of the first main out-put supply module will raise.When the first comparator circuit U1A exports high level, triode Q1 will conducting, and the voltage at electric capacity C13 two ends will be released by resistance R10 and triode, and the control end voltage of the first main out-put supply module will reduce, output voltage will reduce, and causes output current in decline.This circuit repeats two actions above repeatedly, and due to retroactive effect, the voltage above electric capacity has very little variation, and the output current of the first main out-put supply module is consistent with setting electric current all the time.Voltage buffer U1B can avoid late-class circuit on the impact of voltage above electric capacity, again can by the voltage above electric capacity to late-class circuit transmission.Resistance R11, R12 form bleeder circuit, and the change in voltage of the first main out-put supply module control end can be allowed slow, and output voltage regulates more stable.It should be noted that the resistance of change resistance R12 can change the height of the first main out-put supply module voltage output, the ceiling voltage that the first main out-put supply module exports in this graph parameter is 12V, and this is a numerical value meeting production technology.
Described zero current control circuit includes the second bleeder circuit, the second comparator circuit U1D, second bleeder circuit connects the output terminal that first gathers amplifying circuit, the tie point of two resistance R5, R6 of the second bleeder circuit connects the end of oppisite phase of the second comparator circuit U1D, the in-phase input end of the second comparator circuit U1D connects the first output terminal of D/A change-over circuit by controlling calibration circuit, the output terminal of the second comparator circuit U1D passes through the base stage of second diode D2, R8 connecting triode Q1.The effect of this circuit is when setting electric current and stopping exporting close to zero or this passage, requires that output voltage is also zero.Resistance R5, R6 form bleeder circuit, and can produce a very low voltage, this voltage is connected to the inverting input of amplifier U1D, and the in-phase input end of amplifier U1D is connected on the output terminal of this passage D/A converter.It should be noted that when the output of this passage of closedown or this passage export be 0, output voltage on the output terminal of the D/A converter of its this passage is all 0 volt, the output terminal of amplifier U1D is high level, this level is added to above the base stage of triode Q1 by diode D2 resistance R8, triode ON, voltage above electric capacity C3 is released, and the control voltage of switch power module is 0V, and output voltage is also 0V.On the contrary, amplifier U1D output low level is then inoperative to triode Q1, does not affect normal current and exports control.
As shown in Figure 4, the structure that the second described collection amplifying circuit and first gathers amplifying circuit is identical, second input end gathering amplifying circuit connects the cathode output end OUTB-of the second main out-put supply module, and the second output terminal gathering amplifying circuit connects the input end of electric current isolation transfer circuit.Described second source output control circuit is identical with the structure of the first power supply output control circuit, and the input end of second source output control circuit connects, and output terminal OUTBADJ connects the Voltage Cortrol end of the second primary power control module.
As shown in Figure 5, it is A7840 that described voltage isolation transfer circuit includes precision photoelectric coupler U10(model), voltage calibration circuit and differential amplifier circuit, voltage calibration circuit includes the 3rd resistance R36, 3rd adjustable resistance RW7, 4th resistance R37, the first end of the 3rd resistance R36 is the input end of voltage isolation circuit, connect OUTB+, second end of the 3rd resistance R36 passes through the first input end of the 3rd adjustable resistance RW7 connecting linear photoelectrical coupler U10, second input end of the 4th resistance R37 connecting linear photoelectrical coupler U10 is passed through in the adjustable side of the 3rd adjustable resistance RW7, filter capacitor C14 is connected with between two input ends, C15, two output terminals of precision photoelectric coupler U10 are respectively by resistance R38, R39 connects differential amplifier circuit U9A(TL084) two input ends, the output terminal of the output terminal of differential amplifier circuit U9A and voltage isolation transfer circuit, connect the input end (pin 8) of A/D change-over circuit U13.Chip U10 can carry out analog quantity voltage transmission.The input end (VIN+) of this chip requires that the highest input voltage is about 0.4V, the voltage at the two ends of the second main out-put supply module output needs through resistance R36 in the drawings, adjustable resistance RW7 step-down process, regulate RW7 to make the input terminal voltage of U10 within 0.4V, meet the job requirement of U10.Because U10 is that differential voltage signal exports, output signal is connected to the differential amplifier circuit be made up of amplifier chip U9A and peripheral components, and the voltage value at the two ends the second main out-put supply module exported is amplified within the scope of 5V voltage value.
Described electric current isolation transfer circuit is identical with the structure that voltage isolates transfer circuit, and the output terminal of electric current isolation transfer circuit connects the input end (pin 3) of A/D change-over circuit U13.
Described control signal isolation transfer circuit is identical with the structure that voltage isolates transfer circuit, the input end of control signal isolation transfer circuit connects the second output terminal of D/A change-over circuit, i.e. U5(TLC5615) output terminal, the output terminal of control signal isolation transfer circuit connects the input end U8AOUT of second source output control circuit.
As shown in Figure 5, described CPU (central processing unit) U3 adopts single-chip microcomputer 89S52, and this chip itself possesses watchdog function, can play good help to the job stability of power supply.
Described controling parameters initialization circuit includes string and turns and the output circuit U15(74LS164 that is shifted), eight lines and three alignments, point of crossing is welded with microswitch with ranks line, the signal output part of CPU (central processing unit) U3 is turned by string and the output circuit U15 that is shifted connects eight lines, and three described alignments are directly connected with CPU (central processing unit) U3.The control signal of 8 lines is provided by chip U15, the function of this chip is that string turns and the effect exported that is shifted, CPU (central processing unit) U3 controls clock and the data bit of this chip by two signal wires, and 8 road output pins of chip just there will be the pulse train of program requirement; 3 alignments of keyboard are directly provided by 3 pins of CPU (central processing unit) U3.Keyboard adopts the mode of scan round successively to detect keyboard, and when some keys are pressed, CPU (central processing unit) U3 will know the numerical value of this key, and carries out data processing according to key assignments, operates accordingly.Owing to directly pressing corresponding numerical key during data setting, make the setting operation of power supply more fast convenient.
Controling parameters initialization circuit is for arranging various parameter and the operation such as duty and control of power supply.When pressing microswitch, the line alignment that this Switch Controller is answered will be connected, and unclamps microswitch, and the ranks line that this Switch Controller is answered will disconnect.
Described display circuit is liquid crystal display YJP1, and this circuit is used for the information such as running parameter, state of display power supply on liquid crystal display.Liquid crystal display adopts 12864M type liquid crystal display, adjustable resistance RW11 is used for the brightness of adjustable liquid crystal display screen, the communication of liquid crystal display and CPU (central processing unit) U3 adopts the working method of serial communication, and resistance R27/R28 is pull-up resistor, can ensure the needs of liquid crystal display circuit working level.
Described hummer sound circuit includes: resistance R45, triode Q3, hummer.Hummer can send the sound when operation keyboard or when occurring abnormal, and when single-chip microcomputer P10 pin is low level, hummer is sounded; When single-chip microcomputer P10 pin is high level, hummer is not sounded.
Described memory circuit is U12(24C02); The data such as the main running parameter to power supply, state and password carry out storage operation.Storage chip adopts electric erasable storage chip 24C02, and parameter can not disappear after power-off, can avoid the trouble of setup parameter during use after storing, and brings very large convenience to operation.The output state of sending a telegram here is determined by setting memory style.During work, sometimes electrical network there will be transient fluctuation, and the micro computer part that power supply itself controls will reset and stop output voltage, if power acquisition output state memory function, power supply will continue to keep the last parameter run upon actuation, can not cause the pause of production.
Described telecommunication circuit is 485 telecommunication circuit U14(MAX485), communication port A, B are used for external communication facilities, such as host computer, this circuit can complete peripherals (as computer) to functions such as the data collection and control operations of power supply, make network consisting between power supply, it is more convenient that Data Control and networking operate.
Described A/D change-over circuit is made up of U13 (TLC1543) and peripheral components.U13 is 10 bit A/D converters of 11 passages, and the effect of this circuit is gathered the voltage in the two-way output load of power supply, current data.AD conversion chip have input altogether 4 road signals in circuit, and the signal that chip 1 pin connects is the current values voltage signal that load A passes through, and (it should be noted that the signal of input chip 1 pin converts voltage to by load current value for representative.) signal that connects of 3 pin is the current values voltage signal that load B passes through, the signal that 5 pin connect is the voltage value signal at load A two ends, and the signal that 8 pin connect is the voltage value signal at load B two ends.Electric capacity C22--C25 is the filter capacitor of signal, adjustable resistance RW9/RW10 be respectively load A voltage, electric current display digital calibration use.This chip is connected with CPU (central processing unit) U3 by 4 signal wires, reaches the object of data acquisition.
The effect of described D/A change-over circuit is the setting value voltage being used as two main out-put supply modules for exporting two-way analog voltage.Chip U4/U5 (TLC5615) is the DA conversion chip of 10, and resistance R30 electric capacity C9 and chip U6 (TL431) forms 2.5V reference circuit, for two DA conversion chips provide 2.5V reference voltage, makes the numerical value after conversion more accurate.Each conversion chip and CPU (central processing unit) U3 have 3 signal wires to be connected to carry out traffic operation, and this chip has individual feature to be exactly export 2 times that changing voltage scope is reference voltage, is that 0 ~ 5V voltage exports.The output voltage of chip U4 is delivered in the first power supply output control circuit, and the output voltage of chip U5 is delivered in second source output control circuit through control signal isolation transfer circuit.CPU (central processing unit) U3 becomes one according to the setting output current numerical value of two passages and controls power circuit through the output of D/A change-over circuit with reference to control voltage after conversion.
The present invention adopts the two-way electric current adjustment circuit of isolation, in real time doubleway output electric current is detected, according to the result detected, in real time output adjustment is carried out to two main out-put supply modules, remain that the electric current in two-way load is in steady state (SS), and precision is high, track stability will be got well, and meets manufacturing technique requirent.The present invention adopts single-chip microcomputer as master control, liquid crystal display shows running parameter, utilize storer to remember the parameter such as duty and password, above configuration can arrange easily running parameter and change, and brings great convenience to the operability of power supply.Power supply itself possesses 485 communication functions, external unit can be utilized to operate power supply and the inter-related task such as digital independent, very easy to use.
The present invention is in order to solve the problem of heat radiation, adopt the switch power module that thermal value is little, utilize large-area aluminium shell as heat radiator, do not adopt radiator fan, power source internal adopts enclosed construction with outside, can prevent outside liquid vapour from entering into power source internal like this, because the load current of upper sand equipment is also little, the efficiency of switch power module is very high, and the heat of generation will be very little, and the heat of power source internal will soon be distributed by heat-dissipating casing.
Claims (10)
1. a dual path isolation constant-current type numerical-control direct-current power source, it is characterized in that: include DC voltage generation circuit, first main out-put supply module and the second main out-put supply module, CPU (central processing unit), first power supply output control circuit, second source output control circuit, first gathers amplifying circuit, second gathers amplifying circuit, the positive pole of the described first main out-put supply module and the second main out-put supply module, cathode output end connects the first load and the second load respectively, the cathode output end of the first main out-put supply module connects A/D change-over circuit, the cathode output end of the first main out-put supply module gathers amplifying circuit by first and connects A/D change-over circuit, the cathode output end of the second main out-put supply module connects A/D change-over circuit by voltage isolation transfer circuit, the cathode output end of the second main out-put supply module gathers amplifying circuit by second successively, electric current isolation transfer circuit connects A/D change-over circuit, the output terminal of described A/D change-over circuit connects the collection signal input end of CPU (central processing unit), the current controling signal output terminal of CPU (central processing unit) connects D/A change-over circuit, first output terminal of D/A change-over circuit connects the first power supply output control circuit, second output terminal connects second source output control circuit by control signal isolation transfer circuit, the first described power supply output control circuit, second source output control circuit connects the Voltage Cortrol end of the first main out-put supply module and the second main out-put supply module respectively, the output of the described first main out-put supply module and the second main out-put supply module is not altogether, described DC voltage generation circuit is respectively each circuit module and powers.
2. dual path isolation constant-current type numerical-control direct-current power source according to claim 1, it is characterized in that: the input end of described CPU (central processing unit) is connected with controling parameters initialization circuit, the cue output terminal of described CPU (central processing unit) is connected with the hummer sound circuit for pointing out operation controling parameters initialization circuit; The output terminal of CPU (central processing unit) is connected with display circuit.
3. dual path isolation constant-current type numerical-control direct-current power source according to claim 2, it is characterized in that: the data transmit-receive end of described CPU (central processing unit) is connected with the memory circuit for storage power running parameter, state and password, the communication ends of described CPU (central processing unit) is connected with for carrying out with peripherals the telecommunication circuit that communicates.
4. the dual path isolation constant-current type numerical-control direct-current power source according to claim 1 or 2 or 3, it is characterized in that: the described first main out-put supply module and the second main out-put supply module adopt enclosed construction, and the first main out-put supply module and the second main out-put supply module-external are fastened with aluminium shell.
5. dual path isolation constant-current type numerical-control direct-current power source according to claim 4, it is characterized in that: described first gathers amplifying circuit includes inverting amplifier, zeroing circuit, enlargement factor regulating circuit, the inverting input of described inverting amplifier is the input end of the first collection amplifying circuit, zeroing circuit includes the first adjustable resistance and the first resistance, the two ends of the first adjustable resistance connect cathode voltage end and the negative electricity pressure side of DC voltage generation circuit respectively, the adjustable side of the first adjustable resistance connects the inverting input of inverting amplifier by the first resistance, enlargement factor regulating circuit includes the second resistance and the second adjustable resistance, one end of second adjustable resistance is connected the output terminal of inverting amplifier with adjustable end, the other end connects the inverting input of inverting amplifier by the second resistance, the in-phase input end of inverting amplifier is by current-limiting resistance ground connection, and the output terminal of inverting amplifier is the output terminal of the first collection amplifying circuit,
The structure that the second described collection amplifying circuit and first gathers amplifying circuit is identical, second input end gathering amplifying circuit connects the cathode output end of the second main out-put supply module, and the second output terminal gathering amplifying circuit connects the input end of electric current isolation transfer circuit.
6. dual path isolation constant-current type numerical-control direct-current power source according to claim 5, it is characterized in that: the first described power supply output control circuit includes the first comparator circuit, capacitor charge and discharge circuit, zero current control circuit and voltage buffer, the inverting input of the first described comparator circuit connects the first output terminal of D/A change-over circuit by controlling calibration circuit, the in-phase input end of the first comparator circuit connects the output terminal that first gathers amplifying circuit, and the output terminal of the first comparator circuit connects the input end of capacitor charge and discharge circuit; Capacitor charge and discharge circuit includes the first diode, triode, electric capacity, the positive pole of the first diode and the input end of capacitor charge and discharge circuit, the base stage of the negative pole connecting triode of the first diode, the collector of triode connects power supply, collector and emitter connects electric capacity two ends, grounded emitter; Collector also connects the in-phase input end of voltage buffer, connects ground connection after the first bleeder circuit, the tie point i.e. output terminal of the first power supply output control circuit of two resistance of the first bleeder circuit after the inverting input of voltage buffer is connected with output terminal;
Zero current control circuit includes the second bleeder circuit, the second comparator circuit, second bleeder circuit connects the output terminal that first gathers amplifying circuit, the tie point of two resistance of the second bleeder circuit connects the end of oppisite phase of the second comparator circuit, the in-phase input end of the second comparator circuit connects the first output terminal of D/A change-over circuit by controlling calibration circuit, the output terminal of the second comparator circuit passes through the base stage of the second diode connecting triode;
Described second source output control circuit is identical with the structure of the first power supply output control circuit.
7. dual path isolation constant-current type numerical-control direct-current power source according to claim 6, it is characterized in that: described voltage isolation transfer circuit includes precision photoelectric coupler, voltage calibration circuit and differential amplifier circuit, voltage calibration circuit includes the 3rd resistance, 3rd adjustable resistance, 4th resistance, the first end of the 3rd resistance is the input end of voltage isolation circuit, second end of the 3rd resistance passes through the first input end of the 3rd adjustable resistance connecting linear photoelectrical coupler, the second input end of the 4th resistance connecting linear photoelectrical coupler is passed through in the adjustable side of the 3rd adjustable resistance, filter capacitor is connected with between two input ends, two output terminals of precision photoelectric coupler connect two input ends of differential amplifier circuit, the output terminal of the output terminal of differential amplifier circuit and voltage isolation transfer circuit,
Described electric current isolation transfer circuit is identical with the structure that voltage isolates transfer circuit.
8. dual path isolation constant-current type numerical-control direct-current power source according to claim 7, it is characterized in that: described control signal isolation transfer circuit is identical with the structure that voltage isolates transfer circuit, the input end of control signal isolation transfer circuit connects the second output terminal of D/A change-over circuit, and the output terminal of control signal isolation transfer circuit connects the input end of second source output control circuit.
9. dual path isolation constant-current type numerical-control direct-current power source according to claim 8, it is characterized in that: described controling parameters initialization circuit includes string and turns and the output circuit that is shifted, eight lines and three alignments, point of crossing is welded with microswitch with ranks line, the signal output part of CPU (central processing unit) is turned by string and the output circuit that is shifted connects eight lines, and three described alignments are directly connected with CPU (central processing unit).
10. dual path isolation constant-current type numerical-control direct-current power source according to claim 9, it is characterized in that: described DC voltage generation circuit includes transformer, buffer circuit power circuit and main circuit power circuit, the elementary connection 220VAC of described transformer, the power input of elementary also out-put supply module main with first and the second main out-put supply module is connected; Secondary connection buffer circuit power circuit and main circuit power circuit simultaneously; Described buffer circuit power circuit includes: current rectifying and wave filtering circuit, mu balanced circuit, transforming circuit, the input end of described current rectifying and wave filtering circuit is connected with the secondary of transformer, the output terminal of current rectifying and wave filtering circuit connects the first mu balanced circuit, the second mu balanced circuit respectively, the output terminal of the first mu balanced circuit, the second mu balanced circuit exports+12V ,-12V respectively, the output terminal of the first described mu balanced circuit is connected with transforming circuit, transforming circuit output+5V;
Described main circuit power circuit is identical with the structure of buffer circuit power circuit.
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| CN108983859B (en) * | 2018-08-08 | 2020-10-09 | 上海精密计量测试研究所 | Programmable power supply |
| CN110176946B (en) * | 2019-01-30 | 2024-10-29 | 深圳市晟瑞科技有限公司 | Relay amplification device and relay amplifier |
| CN111601428A (en) * | 2020-04-03 | 2020-08-28 | 江苏固立得精密光电有限公司 | Super-power LED curing equipment controller |
| CN115116377A (en) * | 2022-08-04 | 2022-09-27 | 昆山国显光电有限公司 | Voltage correction circuit and display device |
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| CN201145864Y (en) * | 2007-12-03 | 2008-11-05 | 北京康拓科技开发总公司 | Numeric control constant-current source |
| CN201293950Y (en) * | 2008-09-24 | 2009-08-19 | 福州大学 | Multipath constant-current source device |
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| KR100360453B1 (en) * | 1999-12-29 | 2002-11-13 | 에스브이 주식회사 | Multi-channel constant current power supply device |
| TWI479293B (en) * | 2012-06-06 | 2015-04-01 | Mult-channel constant voltage and constant current converting controler and apparatus |
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| CN201145864Y (en) * | 2007-12-03 | 2008-11-05 | 北京康拓科技开发总公司 | Numeric control constant-current source |
| CN201293950Y (en) * | 2008-09-24 | 2009-08-19 | 福州大学 | Multipath constant-current source device |
| CN201788434U (en) * | 2009-10-19 | 2011-04-06 | 株洲南车时代电气股份有限公司 | Multipath bidirectional digital controlled constant current source |
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