CN207037515U - A kind of adjustable Digital Control Direct Current Source - Google Patents

Abstract

The utility model discloses a kind of adjustable Digital Control Direct Current Source, belong to fields of numeric control technique.The Digital Control Direct Current Source includes CPU module, keyboard to set up module, data acquisition module, D/A data modules, adjustable control circuit module, adjustable current source module, power circuit block, LCD data disaply moudles.The utility model is using DSP56F807 as core central processor；Keyboard to set up module uses EBI keyboard, has the function of setting value adjustment；In adjustable current source module, the high current required for constant-current supply is provided using high power combination triode, load is variable, and output voltage changes within 10V；D/A data module output voltage control output currents are adjusted between 20mA to 2000mA, and keep stable；The various working conditions such as output current are shown by CPU module control output driving LCD data disaply moudles in the course of work, and use LCD liquid crystal display screen, when overcoming the display of system dynamic refresh the shortcomings that LED pipe flickering display.

Description

A kind of adjustable Digital Control Direct Current Source

Technical field

The utility model belongs to fields of numeric control technique, more particularly to a kind of adjustable Digital Control Direct Current Source.

Background technology

Branch of the DC current source as stabilized power source, there is important practical valency in engineering technology and fields of measurement Value, its application being related to have stable electromagnetic field, correcting current table etc. to extend to laser, superconduction, modern communicationses and sensing technology etc. Field.Although the current source based on analog circuit can realize high accuracy, wide-range current output, its is complicated, adjustment Difficulty, instruction be not directly perceived.With the development of microprocessor technology, the intelligent High-accuracy direct current electric current using microprocessor as core The design in source starts to occur, its with control the features such as flexible, digital regulated, output accuracy is high be applied to it is various have degree of precision will The occasion asked, illustrate good application prospect.

Utility model content

The purpose of this utility model is the provision of one kind and is based on adjustable Digital Control Direct Current Source, it is intended to solves general Constant-current source produces error because unadjustable at work, the problem of so as to influence whole work process.

The technical solution of the utility model is as follows：

A kind of adjustable Digital Control Direct Current Source, including：CPU module, keyboard to set up module, data acquisition Module, D/A data modules, adjustable control circuit module, adjustable current source module, power circuit block, LCD data show mould Block；The keyboard to set up module is connected with the CPU module；The data acquisition module and the central processing unit Module connects；The D/A data modules are connected in the CPU module；The adjustable control circuit module is connected in institute State D/A data modules, the power circuit block is connected to the adjustable current source module and adjustable control circuit module；Institute State adjustable current source module and be connected in the adjustable control circuit module；The LCD data disaply moudles are connected in the center Processor module.

Further adopted according to adjustable Digital Control Direct Current Source described in the utility model, the CPU module With DSP56F807 processors.

Further according to adjustable Digital Control Direct Current Source described in the utility model, the keyboard to set up module by Master, Slave1, Slave2 form with some resistance and bus, and described Master, Slave1, Slave2 draw one respectively End ground connection, Master draw two common leads SDA and SCL again, wherein SDA leads connect after a pull-up resistor Rp1 with electricity Source Vdd is connected, and SCL leads are connected after connecting a pull-up resistor Rp2 with power supply Vdd, and Slave1 1 pin meets lead SDA, 3 pins that 2 pins meet lead SCL, Slave2 meet lead SDA, and 4 pins meet lead SCL.

Further included according to adjustable Digital Control Direct Current Source described in the utility model, the D/A data modules D/A data outputting modules and D/A data amplification modules；The D/A data outputting modules are connected in the CPU module, And it is connected with the D/A data amplification module；The D/A data amplification module is connected in the D/A data outputting modules, and And it is connected with the adjustable control circuit module；D/A converter of the D/A data outputting modules comprising model MAX5251, D/ACONNECTOR and slide rheostat, the MOSI pins of the DSP56F807 processors are with converter MAX5251's DIN pins are connected, and the MISO pins of the DSP56F807 processors are connected with converter MAX5251 DOUT pins, described The SCLK pins of DSP56F807 processors are connected with converter MAX5251 SCLK pins, the DSP56F807 processors PB4 pins are with converter MAX5251'sPin is connected, the DSP56F807 processorsPin and converter MAX5251'sPin is connected, converter MAX5251 OUTA, OUTB, OUTC, OUTD pin respectively with D/ ACONNECTOR 1,3,5,7 pins are connected, and D/ACONNECTOR 2,4,6,8 pins are grounded after being connected, converter MAX5251 Vref pins are connected with slide rheostat R97 moving plate pins, and slide rheostat R97 stators pin one terminates+3.3V Power supply, other end ground connection；The D/A data amplification module is made up of an amplifier U1A, some electric capacity, electrochemical capacitor, the circuit Model LM248, the amplifier U1A that amplifier uses 1 end are that output end, 2 ends and 3 ends are that input, 4 ends are positive supplies End, 11 ends are negative power ends；Amplifier U1A 1 end is connected with 2 ends in the circuit is followed by DAOUT ends, as described controllable The input signal of circuit module processed, 3 termination D/A ends, the D/A signals from the output of D/A data outputting modules is received as whole mould The input signal of block, 4 termination+15V power supplys, electric capacity C3 latter termination amplifier U1As in parallel with electrochemical capacitor C4 4 ends, the other end Ground connection, amplifier U1A 11 termination -15V power supplys, electrochemical capacitor C1 latter termination amplifier U1As in parallel with electric capacity C2 11 ends, separately One end is grounded, and the module completes the output after the amplification of D/A data, and D/A circuit output voltage scope controls are in 0~0.9V.

Further according to adjustable Digital Control Direct Current Source described in the utility model, the adjustable control circuit module Circuit be made up of two amplifiers with some resistance, slide rheostat, the circuit amplifier use model LM248；The first order Amplifier U2AA 1 end is connected with 2 ends, and 3 terminating resistor R2 one end and a slide rheostat R3 fixing end, resistance R2 are another The stator pin of one termination+15V power supplys, slide rheostat R3 moving plates pin and moving plate pin connection is same with resistance R4's End, resistance R4 other ends ground connection, amplifier U2AA 4,11 ends are hanging；Second level amplifier U2BA 1 end and the indirect resistance at 2 ends R8,2 ends are grounded after meeting a resistance R7 again, and 3 one resistance R5 of termination are followed by DAOUT, its output phase with D/A data amplification modules Even, amplifier U2BA 4,11 ends are hanging, and first order amplifier U2AA 1 end passes through a resistance R6 with second level amplifier U2BA 3 ends It is connected；Secondly, the second level amplifier U2BA of the module 1 termination OUT terminal, the OUT terminal and the following adjustable current source IN ends are connected in modular circuit.

Further according to adjustable Digital Control Direct Current Source described in the utility model, the adjustable current source module Circuit structure diagram, it is made up of two triodes, an amplifier, some electric capacity, resistance, slide rheostat, the adjustable current Model LM248, the amplifier U1B that source module amplifier U1B is used 5 ends, 6 ends are input, and 7 ends are output end；It is described 5 ends of amplifier U1B in adjustable current source modular circuit are connected in IN ends, the IN ends and the adjustable control circuit module OUT terminal is connected, and the amplifier U1B of the adjustable current source module 6 ends are connected with 7 ends by an electric capacity C5, and 6 ends connect a resistance again R9 is followed by+12V power supplys, and base stage of 7 ends again with triode Q2 is connected, and triode Q2 emitter stage is directly coupled to triode Q1's In base stage, Q1 emitter stage meets sampling resistor R9 and is followed by+12V power supplys, and Q2 colelctor electrode is connected with Q1 colelctor electrode, Q2 current collection Pole is grounded after meeting after variable load resistance RL connecting resistance Rref again, RL slide plate termination reference voltage REF.

Further according to adjustable Digital Control Direct Current Source described in the utility model, the LCD data disaply moudles It is made up of LCM12832ZK graphic dot matrix liquid crystal display screens and some electrochemical capacitors, resistance, slide rheostat； LCM12832ZK LCDs connected modes：Its 1 pin VO connects slide rheostat VR1 fixing end one end and slide plate end, and 2 Pin VR connects the sliding other end for becoming VR1 fixing ends, 3 pin GND ground connection, and 4 pins divide two-way, connect+5V power supplys, another way all the way It is grounded after connecing electrochemical capacitor C21 positive pole, 6 pin RS connect GPIOB0 (being processor DSP56F807 CS pins), 7 pins RW meets GPIOB1 (being processor DSP56F807 SID pins), and it (is processor DSP56F807 that 8 pin E, which meet GPIOB2, SCLK pins), 17 pin PSB ground connection, 18 pins/RST meets GPIOB3, and 19 pin LK connecting resistances R11 meet -5V, 20 pin LA Connecting resistance R12 meets+5V.

Compared with present technology, its advantage is the utility model：

1. the utility model can set required number range by keyboard, so that the steady-state current value of output Span is big.

2. the utility model compares in general constant-current source, with its output accuracy it is high the features such as illustrate good application before Scape.

Brief description of the drawings

Fig. 1 is scantling plan of the present utility model；

Fig. 2 is the connection figure of the show bus signal in keyboard to set up module of the present utility model；

Fig. 3 is D/A data outputting modules schematic diagram of the present utility model；

Fig. 4 is D/A data amplifier module circuit diagram of the present utility model；

Fig. 5 is adjustable control circuit module circuit diagram of the present utility model；

Fig. 6 is adjustable current source module circuit diagram of the present utility model；

Fig. 7 is LCD data disaply moudles connection figure of the present utility model.

Embodiment

In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing, to this reality It is further elaborated with new.It should be appreciated that specific embodiment described herein is only to explain the utility model, It is not used to limit the utility model.

If Fig. 1 is scantling plan of the present utility model.The utility model by CPU module, keyboard to set up module, Data acquisition module, D/A data modules, adjustable control circuit module, adjustable current source module, power circuit block, LCD data Totally 8 modules form display module.

The keyboard to set up module is connected with the CPU module；The data acquisition module and the centre Manage the connection of device module；The D/A data modules are connected in the CPU module；The adjustable control circuit module is connected Connected in the D/A data modules, the power circuit block with the adjustable current source module；The adjustable current source mould Block is connected in the adjustable control circuit module and the power circuit block；The power circuit block and the adjustable control Circuit module connects with the adjustable current source module；The LCD data disaply moudles are connected in the CPU module.

The D/A data modules include the D/A data outputting modules and the D/A data amplification module.The D/A numbers The CPU module is connected according to output module, and is connected with the D/A data amplification module；The D/A data Amplification module is connected in the D/A data outputting modules, and is connected with the adjustable control circuit module.

The CPU module uses DSP56F807 processors.The processor possesses the I/O interfaces of greater number, Offer more can be with the connection of external resource；With being internally integrated, high accuracy, 12 A/D converters of high-speed, improve Sampling precision, avoid interference of the peripheral circuit to sampling；And MAX5251 four-ways are carried on the processor piece, 10 Bits Serials D/A converter.

As Fig. 2 be keyboard to set up module of the present utility model in show bus signal connection figure, its by Master, Slave1, Slave2 form with some resistance and bus.These three devices draw one end ground connection respectively.Master draws two again Root common lead SDA and SCL, wherein SDA leads are connected after connecting a pull-up resistor Rp1 with power supply Vdd, the connection of SCL leads It is connected after one pull-up resistor Rp2 with power supply Vdd.Slave1 1 pin meets lead SDA, and 2 pins meet lead SCL.Slave2 3 pins meet lead SDA, 4 pins meet lead SCL.

If Fig. 3 is D/A data outputting modules schematic diagram of the present utility model.The module includes model MAX5251's D/A converter, D/ACONNECTOR and rheostat.The wherein MOSI pins and converter of DSP56F807 processors MAX5251 DIN pins are connected, and the MISO pins of DSP56F807 processors are connected with converter MAX5251 DOUT pins, Processor DSP56F807 SCLK pins are connected with converter MAX5251 SCLK pins, the PB4 of DSP56F807 processors Pin is with converter MAX5251'sPin is connected, DSP56F807 processorsPin is with converter MAX5251'sPin is connected, converter MAX5251 OUTA, OUTB, OUTC, OUTD pin respectively with D/ACONNECTOR 1,3,5, 7 pins are connected, and D/ACONNECTOR 2,4,6,8 pins are grounded after being connected, and converter MAX5251 Vref pins become with sliding Resistance device R97 slide plates end is connected, and the sliding fixing end one that becomes terminates+3.3V/A power supplys, fixing end other end ground connection.

As Fig. 4 be D/A data amplification module of the present utility model circuit structure diagram, its by an amplifier, some electric capacity, Electrochemical capacitor forms, the model LM248 that circuit amplifier U1A is used.1 end of the amplifier U1A is output end, 2 ends and 3 ends It is that input, 4 ends are that positive power source terminal, 11 ends are negative power ends.Amplifier U1A 1 end is connected with 2 ends in the circuit is followed by DAOUT ends, as the input signal of the adjustable control circuit module, 3 termination D/A ends, receive defeated from D/A data outputting modules Input signal of the D/A signals gone out as whole module, 4 termination+15V power supplys.One end after electric capacity C3 is in parallel with electrochemical capacitor C4 Connect amplifier U1A 4 ends, other end ground connection.Amplifier U1A 11 termination -15V power supplys.Electrochemical capacitor C1 is in parallel with electric capacity C2 latter Terminate amplifier U1A 11 ends, other end ground connection.The module completes the output after the amplification of D/A data, and D/A circuit output voltages Scope control is in 0~0.9V.

As Fig. 5 be adjustable control circuit module of the present utility model circuit structure diagram, if the circuit by two amplifiers with Dry resistance, slide rheostat composition, the model LM248 that the adjustable control circuit module amplifier uses.First order amplifier U2AA 1 end is connected with 2 ends, 3 terminating resistor R2 one end and a sliding fixing end for becoming R3, another termination+15V power supplys of R2, Same one end of slide rheostat R3 moving plates pin and the stator pin and resistance R4 of moving plate pin connection, another terminations of resistance R4 Ground, amplifier U2AA 4,11 ends are hanging.Second level amplifier U2BA 1 end and the indirect resistance R8 at 2 ends, 2 ends connect a resistance again It is grounded after R7,3 one resistance R5 of termination are followed by DAOUT, and it is connected with the output of D/A data amplification modules, and 4, the 11 of amplifier U2BA End is hanging.First order amplifier U2AA 1 end is connected with second level amplifier U2BA 3 ends by a resistance R6.Secondly, described mould The second level amplifier U2BA of block 1 termination OUT terminal, the OUT terminal and IN ends phase in following described adjustable current source modular circuit Fig. 3 Even.

Such as the circuit structure diagram that Fig. 6 is adjustable current source module of the present utility model, it is by two triodes, a fortune Put, some electric capacity, resistance, slide rheostat composition, the model LM248 that the adjustable current source module amplifier U1B is used, institute State amplifier U1B 5 ends, 6 ends are input, 7 ends are output end.5 of amplifier U1B in the adjustable current source modular circuit End is connected in IN ends, and the IN ends are connected with the OUT terminal in adjustable control circuit module principle Fig. 2 described above.The adjustable electric 6 ends of amplifier U1B in stream source module circuit are connected with 7 ends by an electric capacity C5, and 6 ends meet a resistance R9 and are followed by+12V electricity again Source, base stage of 7 ends again with triode Q2 are connected.Triode Q2 emitter stage is directly coupled in triode Q1 base stage, Q1's Emitter stage meets sampling resistor R9 and is followed by+12V power supplys, and Q2 colelctor electrode is connected with Q1 colelctor electrode, and Q2 colelctor electrode connects variable bear It is grounded after carrying after resistance RL connecting resistance Rref again, RL slide plate termination REF (reference voltage).

Such as the connection figure that Fig. 7 is LCD data disaply moudles of the present utility model, the utility model is schemed using LCM12832ZK Shape LCD screen, the module are made up of the display screen and some electrochemical capacitors, resistance, slide rheostat. LCM12832ZK LCDs connected modes：Its 1 pin VO connects slide rheostat VR1 fixing end one end and slide plate end, 2 pipes Pin VR connects the sliding other end for becoming VR1 fixing ends, 3 pin GND ground connection, and 4 pins divide two-way, connect+5V power supplys all the way, and another way connects It is grounded after electrochemical capacitor C21 positive pole, 6 pin RS meet GPIOB0 (being processor DSP56F807 CS pins), 7 pin RW GPIOB1 (being processor DSP56F807 SID pins) is met, it (is processor DSP56F807's that 8 pin E, which meet GPIOB2, SCLK pins), 17 pin PSB ground connection, 18 pins/RST meets GPIOB3, and 19 pin LK connecting resistances R11 meet -5V, and 20 pin LA connect Resistance R12 meets+5V.

The utility model can be configured by keyboard to set up module to output voltage, be exported by CPU module control D/A data modules processed export a burning voltage, are turned afterwards by adjustable control circuit module and the output of adjustable current source module Change corresponding steady-state current into.In the course of work, the various working conditions such as output current control defeated by CPU module Go out to drive LCD data disaply moudles to show.In adjustable current source module, we are provided permanent using high power combination triode The high current required for power supply is flowed, ensures that output voltage changes within 10V in the case where load is variable.D/A data modules Output voltage control output current is adjusted between 20mA to 2000mA, and keeps stable.Power circuit block is whole system Power supply.

It the above is only and preferred embodiment of the present utility model is described, not by technical side of the present utility model Case limited to this, any known deformation that those skilled in the art are made on the basis of major technique of the present utility model design all belong to In the claimed technology category of the utility model, the specific protection domain of the utility model is recited as with claims It is accurate.

Claims (7)

1. A kind of 1. adjustable Digital Control Direct Current Source, it is characterised in that including：CPU module, keyboard to set up module, Data acquisition module, D/A data modules, adjustable control circuit module, adjustable current source module, power circuit block, LCD data Display module；The keyboard to set up module is connected with the CPU module；The data acquisition module and the center Processor module connects；The D/A data modules are connected in the CPU module；The adjustable control circuit module phase It is connected in the D/A data modules, the power circuit block is connected to the adjustable current source module and adjustable control circuit mould Block；The adjustable current source module is connected in the adjustable control circuit module；The LCD data disaply moudles are connected in described CPU module.
2. 2. adjustable Digital Control Direct Current Source according to claim 1, it is characterised in that the CPU module Using DSP56F807 processors.
3. 3. adjustable Digital Control Direct Current Source according to claim 1, it is characterised in that the keyboard to set up module by Master, Slave1, Slave2 form with some resistance and bus, and described Master, Slave1, Slave2 draw one end respectively Ground connection, Master draw two common leads SDA and SCL again, wherein SDA leads connect after a pull-up resistor Rp1 with power supply Vdd is connected, and SCL leads are connected after connecting a pull-up resistor Rp2 with power supply Vdd, and Slave1 1 pin meets lead SDA, and 2 draw 3 pins that pin meets lead SCL, Slave2 meet lead SDA, and 4 pins meet lead SCL.
4. 4. adjustable Digital Control Direct Current Source according to claim 2, it is characterised in that the D/A data modules bag Include D/A data outputting modules and D/A data amplification modules；The D/A data outputting modules are connected in the central processing unit mould Block, and be connected with the D/A data amplification module；The D/A data amplification module is connected in the D/A data outputs mould Block, and be connected with the adjustable control circuit module；The D/A that the D/A data outputting modules include model MAX5251 turns Parallel operation, D/ACONNECTOR and slide rheostat, the MOSI pins and converter of the DSP56F807 processors MAX5251 DIN pins are connected, the MISO pins of the DSP56F807 processors and converter MAX5251 DOUT pin phases Even, the SCLK pins of the DSP56F807 processors are connected with converter MAX5251 SCLK pins, at the DSP56F807 The PB4 pins of device are managed with converter MAX5251'sPin is connected, the DSP56F807 processorsPin is with turning Parallel operation MAX5251'sPin is connected, converter MAX5251 OUTA, OUTB, OUTC, OUTD pin respectively with D/ ACONNECTOR 1,3,5,7 pins are connected, and D/ACONNECTOR 2,4,6,8 pins are grounded after being connected, converter MAX5251 Vref pins be connected with slide rheostat R97 moving plate pins, slide rheostat R97 stators pin one terminates+3.3V power supplys, separately One end is grounded；The D/A data amplification module is made up of an amplifier U1A, some electric capacity, electrochemical capacitor, and the circuit amplifier is adopted Model LM248, the amplifier U1A 1 end are that output end, 2 ends and 3 ends are that input, 4 ends are positive power source terminal, 11 ends It is negative power end；Amplifier U1A 1 end is connected with 2 ends in the circuit is followed by DAOUT ends, as the adjustable control circuit mould The input signal of block, 3 termination D/A ends, receive the input as whole module from the D/A signals of D/A data outputting modules output Signal, 4 termination+15V power supplys, electric capacity C3 latter termination amplifier U1As in parallel with electrochemical capacitor C4 4 ends, other end ground connection, amplifier U1A 11 termination -15V power supplys, electrochemical capacitor C1 latter termination amplifier U1As in parallel with electric capacity C2 11 ends, other end ground connection should Module completes the output after the amplification of D/A data, and D/A circuit output voltage scope controls are in 0~0.9V.
5. 5. adjustable Digital Control Direct Current Source according to claim 4, it is characterised in that the adjustable control circuit mould The circuit of block is made up of two amplifiers with some resistance, slide rheostat, the model LM248 that the circuit amplifier uses；First Level amplifier U2AA 1 end is connected with 2 ends, and 3 terminating resistor R2 one end and a slide rheostat R3 fixing end, resistance R2 are another The stator pin of one termination+15V power supplys, slide rheostat R3 moving plates pin and moving plate pin connection is same with resistance R4's End, resistance R4 other ends ground connection, amplifier U2AA 4,11 ends are hanging；Second level amplifier U2BA 1 end and the indirect resistance at 2 ends R8,2 ends are grounded after meeting a resistance R7 again, and 3 one resistance R5 of termination are followed by DAOUT, its output phase with D/A data amplification modules Even, amplifier U2BA 4,11 ends are hanging, and first order amplifier U2AA 1 end passes through a resistance R6 with second level amplifier U2BA 3 ends It is connected；Secondly, the second level amplifier U2BA of the module 1 termination OUT terminal, the OUT terminal and the following adjustable current source IN ends are connected in modular circuit.
6. 6. adjustable Digital Control Direct Current Source according to claim 5, it is characterised in that the adjustable current source module Circuit structure diagram, it is made up of two triodes, an amplifier, some electric capacity, resistance, slide rheostat, the adjustable electric 5 ends, 6 ends for flowing model LM248, the amplifier U1B that source module amplifier U1B is used are input, and 7 ends are output end；Institute 5 ends for stating the amplifier U1B in adjustable current source modular circuit are connected in IN ends, the IN ends and the adjustable control circuit module OUT terminal is connected, and the amplifier U1B of the adjustable current source module 6 ends are connected with 7 ends by an electric capacity C5, and 6 ends connect a resistance again R9 is followed by+12V power supplys, and base stage of 7 ends again with triode Q2 is connected, and triode Q2 emitter stage is directly coupled to triode Q1's In base stage, triode Q1 emitter stage meets sampling resistor R9 and is followed by+12V power supplys, triode Q2 colelctor electrode and triode Q1's Colelctor electrode is connected, and triode Q2 colelctor electrode is grounded after meeting after slide rheostat RL connecting resistance Rref again, slide rheostat RL's Slide plate termination reference voltage REF.
7. 7. adjustable Digital Control Direct Current Source according to claim 2, it is characterised in that the LCD data show mould Block is made up of LCM12832ZK graphic dot matrix liquid crystal display screens and some electrochemical capacitors, resistance, slide rheostat； LCM12832ZK LCDs connected modes：Its 1 pin VO connects slide rheostat VR1 fixing end one end and slide plate end, 2 pipes Pin VR connects the sliding other end for becoming VR1 fixing ends, 3 pin GND ground connection, and 4 pins divide two-way, connect+5V power supplys all the way, and another way connects electricity It is grounded after solution electric capacity C21 positive pole, 6 pin RS connect the CS pins that GPIOB0 is processor DSP56F807, and 7 pin RW connect GPIOB1 is processor DSP56F807 SID pins, and 8 pin E meet the SCLK that GPIOB2 is processor DSP56F807 and drawn Pin, 17 pin PSB ground connection, 18 pins/RST meet GPIOB3, and 19 pin LK connecting resistances R11 meet -5V, 20 pin LA connecting resistances R12 Meet+5V.