CN205193648U - Numerical control direct current source device based on singlechip - Google Patents
Numerical control direct current source device based on singlechip Download PDFInfo
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- CN205193648U CN205193648U CN201521027515.7U CN201521027515U CN205193648U CN 205193648 U CN205193648 U CN 205193648U CN 201521027515 U CN201521027515 U CN 201521027515U CN 205193648 U CN205193648 U CN 205193648U
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Abstract
The utility model belongs to the technical field of the direct current source, concretely relates to numerical control direct current source device based on singlechip, comprising an one -chip microcomputer, a D/A converting module, the regulations of output module, AD conversion module, the power modul, button module and display module, power module is used for providing the power for system's work chip, button module and AD conversion module's output is connected to the input of singlechip, the output and display module and DA conversion module's the input of singlechip are connected, DA conversion module's the output and the input of regulations of output module are connected, the output of regulations of output module is connected with AD conversion module's input, the regulations of output module includes the constant -current source circuit, sampling circuit and load circuit, the output of singlechip still is connected with alarm module. The utility model discloses simple structure, reliability height are and have alarming function.
Description
Technical field
The utility model belongs to DC current source technical field, is specifically related to a kind of SCM Based Digital Control Direct Current Source device.
Background technology
Digital Control Direct Current Source is a kind of common electronic device, is widely used in electronic circuit, the field such as education experiment and scientific research.But at present the experiment most output accuracy of direct supply used and stability not high; In measurement, general pointer-type or the charactron of adopting shows voltage or electric current, and collocation potentiometer adjusts desired voltage and current output value; Use to adjust accurate voltage or electric current output, must monitor by the accurate Displaying Meter of collocation, resistance characteristic again because of potentiometer is non-linear, need when adjusting to spend the regular hour, also to take care drift, and existing device does not possess warning reminding function, even if very big error appears in actual output current value and pre-set current value, also be not easy by Timeliness coverage, use very inconvenient.
Utility model content
The purpose of this utility model is to provide that a kind of structure is simple, reliability is high and have the SCM Based Digital Control Direct Current Source device of warning function.
For achieving the above object, the utility model is sampled following technical scheme: a kind of SCM Based Digital Control Direct Current Source device, comprise single-chip microcomputer, D/A modular converter, export adjusting module, A/D modular converter, power module, key-press module and display module, described power module is used for providing direct supply for system works chip, the input end of described single-chip microcomputer connects the output terminal of key-press module and A/D modular converter, the output terminal of single-chip microcomputer is connected with the input end of display module and D/A modular converter, the output terminal of described D/A modular converter is connected with the input end exporting adjusting module, the output terminal of described output adjusting module is connected with the input end of A/D modular converter, the output terminal of described single-chip microcomputer is also connected with alarm module, described alarm module comprises hummer and triode, the base stage of described triode is connected with the output terminal of single-chip microcomputer by the tenth resistance, transistor emitter connects power supply, the collector of triode is connected with hummer one end, hummer other end ground connection, described output adjusting module comprises constant-current source circuit, for gather actual output current value sample circuit and for providing the load circuit of high precision reference voltage, described constant-current source circuit comprises the first operational amplifier and field effect transistor, the normal phase input end of described first operational amplifier is connected with the output terminal of D/A modular converter, the cathode power supply termination power positive pole of the first operational amplifier, the negative power supply termination power negative pole of the first operational amplifier, the inverting input of the first operational amplifier is connected with the source electrode of field effect transistor, the output terminal of the first operational amplifier is connected with the grid of field effect transistor by the second resistance, the source electrode of described field effect transistor is connected with sample circuit, the drain electrode of field effect transistor is connected with load circuit.
Described sample circuit comprises sampling resistor and the second operational amplifier for gathering sampling resistor both end voltage, described sampling resistor first end is connected with the source electrode of field effect transistor, second end of sampling resistor is connected with the positive pole of reometer, the minus earth of described reometer, reometer is for showing actual output current value, the 5th electric capacity is parallel with between the first end of sampling resistor and the negative pole of reometer, the described normal phase input end of the second operational amplifier is connected with the first end of sampling resistor, the cathode power supply termination power positive pole of the second operational amplifier, the negative power supply termination power negative pole of the second operational amplifier, the inverting input of the second operational amplifier is connected with the output terminal of the second operational amplifier, the output terminal of the second operational amplifier is connected with the input end of A/D modular converter.
Described load circuit comprises pull-up resistor and the 3rd operational amplifier, described pull-up resistor first end is connected with the drain electrode of field effect transistor, second end of pull-up resistor is connected with 15V power supply, pull-up resistor first end is connected with the inverting input of the 3rd operational amplifier by the 4th resistance, second end of pull-up resistor is connected with the normal phase input end of the 3rd operational amplifier by the 5th resistance, the cathode power supply termination power positive pole of described 3rd operational amplifier, the negative power supply termination power negative pole of the 3rd operational amplifier, the normal phase input end of the 3rd operational amplifier is also by the 3rd resistance eutral grounding, described 3rd resistance two ends are parallel with the 4th electric capacity, the inverting input of the 3rd operational amplifier is connected with the output terminal of the 3rd operational amplifier by the 6th resistance, the inverting input of the 3rd operational amplifier is connected with the input end of A/D modular converter.
Described key-press module comprise "+" button, "-" button, " OK " button, " SET " button, " DEL " button, " RESET/ON " button and 0 ~ 9 nine numeric input keys.
Described display module adopts LM016L LCDs, the difference of display module display pre-set current value, actual output current value and pre-set current value and actual output current value.
Described power module provides direct supply for system works chip, power module circuitry comprises transformer, the bridge rectifier circuit of four diode compositions, five filter capacitors and three three terminal regulators, one termination civil power of described transformer, another termination bridge rectifier circuit, civil power converts direct current to through bridge rectifier circuit again after transformer pressure-reducing, the positive pole of positive output termination first filter capacitor of bridge rectifier circuit, the negative pole of the first filter capacitor connects the positive pole of the second filter capacitor, the plus earth of the second filter capacitor, the negative pole of the second filter capacitor connects the negative output terminal of bridge rectifier circuit, the negative output terminal of bridge rectifier circuit is connected with the input end of the second three terminal regulator, the input end of described second three terminal regulator is connected with the positive pole of the second diode, the negative pole of described second diode is connected with the output terminal of the second three terminal regulator, the output terminal of the second three terminal regulator exports-15V direct supply, the output terminal of the second three terminal regulator is by the 4th filter capacitor ground connection, described 4th filter capacitor two ends are parallel with the 6th electric capacity, the positive output end of bridge rectifier circuit is connected with the input end of the first three terminal regulator, the input end of described first three terminal regulator is connected with the negative pole of the first diode, the positive pole of described first diode is connected with the output terminal of the first three terminal regulator, the output terminal of the first three terminal regulator exports+15V direct supply, the output terminal of the first three terminal regulator is by the 3rd filter capacitor ground connection, the output terminal of the first three terminal regulator is connected with the input end of the 3rd three terminal regulator by the 9th resistance, the output terminal of the 3rd three terminal regulator exports+5V direct supply, the output terminal of the 3rd three terminal regulator is by the 5th filter capacitor ground connection, the two ends of described 5th filter capacitor are parallel with the 7th electric capacity, described first three terminal regulator, the equal ground connection of earth terminal of the second three terminal regulator and the 3rd three terminal regulator.
Compared with prior art, the beneficial effects of the utility model are:
1, the single-chip microcomputer output terminal in the utility model is connected with alarm module, when the error of actual output current value and pre-set current value be greater than set permissible error value time, single-chip microcomputer output signal amplifies rear drive buzzer warning by triode, reminds staff to note; Constant-current source circuit adopts the first operational amplifier and field effect transistor, simple circuit, adopts field effect transistor, can realize voltage preferably and approximately linearly control electric current;
2, sampling resistor employing constantan wire coiling (resistance variation with temperature is less) the one-tenth resistance in the utility model is the resistance of 1 Ω, sampling resistor both end voltage value is converted into current value and can obtains actual output current value, actual output current value shows on reometer, the voltage at sampling resistor two ends amplifies through the second operational amplifier successively as feedback voltage, A/D modular converter is sent in single-chip microcomputer after changing, for comparing with reference voltage, ensure that actual output current value is consistent with pre-set current value;
3, pull-up resistor first termination field effect transistor in the utility model, second termination 15V power supply, the voltage at pull-up resistor two ends as the reference voltage, amplify through the 3rd operational amplifier, send into after the conversion of A/D modular converter in single-chip microcomputer, for comparing with the feedback voltage at sampling resistor two ends, single-chip microcomputer compares analysis to feedback voltage and reference voltage and obtains error voltage, this error voltage is transported to output adjusting module through D/A modular converter, this error voltage exports the conducting degree controlling field effect transistor after the first operational amplifier amplifies, make the Step wise approximation of pre-set current value and actual output current value, until equal, thus reach the object of numerical control,
4, the key-press module in the utility model is for inputting adjustment pre-set current value, key-press module keyboard adopts standard 4 × 4 keyboard, matrix form rank scanning mode, the button used due to this design is more, adopt this kind of key-press module to reduce to take the I/O mouth number of single-chip microcomputer, and can accomplish directly to input pre-set current value, Use Adjustment is convenient and simple;
5, the display module in the utility model shows pre-set current value, actual output current value and shows the difference of pre-set current value and actual output current value, display module adopts LM016L LCDs, and use liquid crystal display effective area is large, resolution is high, antijamming capability is strong, power consumption is little and design circuit is simple;
6, the power module in the utility model adopts 3 three terminal regulators, first three terminal regulator (model is 7815), the second three terminal regulator (model is 7915) and the 3rd three terminal regulator U9(model are 7805) obtain the stable dc power supply of+15V ,-15V and+5V respectively, circuit is simple, and working stability is reliable.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is the circuit theory diagrams of power module in the utility model.
Embodiment
A kind of SCM Based Digital Control Direct Current Source device, as shown in Figure 1-2, comprise single-chip microcomputer, D/A modular converter, export adjusting module, A/D modular converter, power module, key-press module and display module, power module is used for providing direct supply for system works chip, single-chip microcomputer U1 adopts AT89C52 model, the input end of single-chip microcomputer U1 connects the output terminal of key-press module and A/D modular converter, wherein A/D modular converter comprises A/D conversion chip U2, A/D conversion chip U2 adopts TLC2543 chip, the pin 16 of A/D conversion chip U2 connects single-chip microcomputer U1 pin 1, the pin 17 of A/D conversion chip U2 connects the pin 2 of single-chip microcomputer U1, the pin 15 of A/D conversion chip U2 connects single-chip microcomputer U1 pin 3, the pin 18 of A/D conversion chip U2 connects the pin 4 of single-chip microcomputer U1, the pin 14 of A/D conversion chip U2 connects power supply, pin 13 ground connection of A/D conversion chip U2, simulating signal is converted to the reading that digital signal is used for single-chip microcomputer U1 by A/D conversion chip U2.The output terminal of single-chip microcomputer U1 is connected with the input end of display module and D/A modular converter, wherein, D/A modular converter comprises D/A conversion chip U3, D/A conversion chip U3 adopts LTC1456, the pin 1 of D/A conversion chip U3 is connected with the pin 14 of single-chip microcomputer, the pin 2 of D/A conversion chip U3 is connected with the pin 13 of single-chip microcomputer, and the pin 3 of D/A conversion chip U3 is connected with the pin 15 of single-chip microcomputer, and D/A conversion chip U3 converts the digital signal of single-chip microcomputer U1 to simulating signal.The output terminal of D/A modular converter is connected with the input end exporting adjusting module, and the output terminal exporting adjusting module is connected with the input end of A/D modular converter.The output terminal of single-chip microcomputer U1 is also connected with alarm module, alarm module comprises hummer LS1 and triode Q2, the base stage of triode Q2 is connected with the pin 8 of single-chip microcomputer U1 by the tenth resistance R10, triode Q2 emitter connects power supply, the collector of triode Q2 is connected with hummer LS1 one end, hummer LS1 other end ground connection, when the error of actual output current value and pre-set current value be greater than set permissible error value time, the pin 8 of single-chip microcomputer U1 outputs signal and amplifies rear drive hummer LS1 warning by triode Q2, reminds staff to note.Export adjusting module comprise constant-current source circuit, for gather actual output current value sample circuit and for providing the load circuit of high precision reference voltage.Constant-current source circuit is used for the electric current of stable output, constant-current source circuit comprises the first operational amplifier U5 and field effect transistor Q1, first operational amplifier U5 adopts OP07 model, the pin 3 of the first operational amplifier U5 is connected with the pin 7 of D/A conversion chip U2, the pin 7 of the first operational amplifier U5 connects positive source, the pin 4 of the first operational amplifier U5 connects power cathode, the pin 2 of the first operational amplifier U5 is connected with the source electrode of field effect transistor Q1, the pin 6 of the first operational amplifier U5 is connected with the grid of field effect transistor Q1 by the second resistance R2, the source electrode of field effect transistor Q1 is connected with sample circuit, the drain electrode of field effect transistor Q1 is connected with load circuit.
Sample circuit comprises sampling resistor R1 and the second operational amplifier U6 for measuring sampling resistor R1 both end voltage, second operational amplifier U6 adopts OP07 model, sampling resistor R1 first end is connected with the source electrode of field effect transistor Q1, second end of sampling resistor R1 is connected with the positive pole of reometer, the minus earth of reometer, reometer is for showing actual output current value, sampling resistor R1 employing constantan wire coiling (resistance variation with temperature is less) one-tenth resistance is the resistance of 1 Ω, sampling resistor R1 both end voltage value is converted into current value and can obtains actual output current value.The pin 3 of the second operational amplifier U6 is connected with the first end of sampling resistor R1, the pin 7 of the second operational amplifier U6 connects positive source, the pin 4 of the second operational amplifier U6 connects power cathode, the pin 2 of the second operational amplifier U6 is connected with the pin 6 of the second operational amplifier U6, the pin 6 of the second operational amplifier U6 is connected with the pin 1 of A/D conversion chip U2, second operational amplifier U6 uses as voltage follower, the voltage at Real-Time Monitoring sampling resistor R1 two ends, the voltage at sampling resistor R1 two ends amplifies through the second operational amplifier U6 successively as feedback voltage, send into after A/D conversion chip U2 changes in single-chip microcomputer U1, the 5th electric capacity C5 for making the feedback voltage of collection more stable is parallel with between the first end of sampling resistor R1 and the negative pole of reometer.
Load circuit comprises pull-up resistor RL and the 3rd operational amplifier U4, 3rd operational amplifier U4 adopts OP07 model, pull-up resistor RL first end is connected with the drain electrode of field effect transistor Q1, second end of pull-up resistor RL with connect 15V power supply, pull-up resistor RL first end is connected with the pin 2 of the 3rd operational amplifier U4 by the 4th resistance R4, second end of pull-up resistor RL is connected with the pin 3 of the 3rd operational amplifier U3 by the 5th resistance R5, the pin 3 of the 3rd operational amplifier U3 is also by the 3rd resistance R3 ground connection, 3rd resistance R3 two ends are parallel with the 4th electric capacity C4, the pin 2 of the 3rd operational amplifier U3 is connected with the pin 6 of the 3rd operational amplifier U3 by the 6th resistance R6, the pin 6 of the 3rd operational amplifier U3 is connected with the pin 2 of A/D conversion chip, the voltage at pull-up resistor RL two ends amplifies through the 3rd operational amplifier U3 as the reference voltage, send into after A/D conversion chip U2 changes in single-chip microcomputer U1, for comparing with the feedback voltage at sampling resistor two ends.The reference voltage of single-chip microcomputer U1 to the feedback voltage at sampling resistor R1 two ends and pull-up resistor RL two ends compares analysis and draws error voltage, this error voltage is transported to output adjusting module through D/A modular converter, this error voltage exports the conducting degree controlling field effect transistor Q1 after the first operational amplifier U5 amplifies, make the Step wise approximation of pre-set current value and actual output current value, until equal, thus reach the object of numerical control.
Key-press module is for inputting pre-set current value, key-press module keyboard adopts standard 4 × 4 keyboard, matrix form rank scanning mode, key-press module comprise "+" button, "-" button, " OK " button, " SET " button, " DEL " button, " RESET/ON " button and 0 ~ 9 nine numeric input keys.Wherein " 7 ", " 8 ", " 9 " are connected with the pin 21 of single-chip microcomputer U1 with the first end of RESET/ON button, " 4 ", " 5 ", " 6 " are connected with the pin 22 of single-chip microcomputer U1 with the first end of "+" button, " 1 ", " 2 ", " 3 " are connected with the pin 23 of single-chip microcomputer U1 with the first end of "-" button, " 0 ", " DEL ", " OK " is connected with the pin 24 of single-chip microcomputer U1 with the first end of " SET " button, " 0 ", " 1 ", " 4 " are connected with the pin 25 of single-chip microcomputer U1 with second end of " 7 " button, " DEL ", " 2 ", " 5 " are connected with the pin 26 of single-chip microcomputer U1 with second end of " 8 " button, " OK ", " 3 ", " 6 " are connected with the pin 27 of single-chip microcomputer U1 with second end of " 9 " button, " SET ", "-", "+" is connected with the pin 28 of single-chip microcomputer U1 with the second end of RESET/ON button.The button used due to this design is more, and adopt this kind of key-press module to reduce to take the I/O mouth number of single-chip microcomputer U1, and can accomplish directly to input pre-set current value, Use Adjustment is convenient and simple.
Display module adopts LM016L LCDs, the difference of display module display pre-set current value, actual output current value and pre-set current value and actual output current value.Pin 7 ~ 14 in LM016L LCDs arranges corresponding with P0.0 ~ P0.7 port of single-chip microcomputer U1 respectively connection by pull-up resistor, the pin 1 of pull-up resistor row connects power supply, the pin 2 of LM016L LCDs connects power supply, the pin 3 of LM016L LCDs and pin 1 ground connection, the pin 4 of LM016L LCDs is connected with the pin 10 of single-chip microcomputer U1, the pin 5 of LM016L LCDs is connected with the pin 11 of single-chip microcomputer U1, and the pin 6 of LM016L LCDs is connected with the pin 12 of single-chip microcomputer U1.Use liquid crystal display effective area is large, resolution is high, antijamming capability is strong, power consumption is little and design circuit is simple.
The crystal oscillator end of single-chip microcomputer is connected with by crystal oscillating circuit, and crystal oscillating circuit comprises crystal oscillator X1, the second electric capacity C2 and the 3rd electric capacity C3.The reset terminal of single-chip microcomputer is connected with reset circuit, and reset circuit comprises reset button, the 8th resistance R8 and the first electric capacity C1.
Power module is used for providing direct supply for system works chip, and as shown in Figure 3, power module comprises transformer TR1, the bridge rectifier circuit BR1 of four diode compositions, five filter capacitors and three three terminal regulators.The model that in three three terminal regulators, the first three terminal regulator U7 adopts is 7815, the model that second three terminal regulator U8 adopts is 7915, the model that 3rd three terminal regulator U9 adopts is 7805, the one termination civil power of transformer TR1, another termination bridge rectifier circuit BR1, civil power converts direct current to through bridge rectifier circuit BR1 again after transformer TR1 step-down, the positive pole of the positive output termination first filter capacitor C11 of bridge rectifier circuit BR1, the negative pole of the first filter capacitor C21 connects the positive pole of the second filter capacitor C22, the plus earth of the second filter capacitor C22, the negative pole of the second filter capacitor C22 connects the negative output terminal of bridge rectifier circuit BR1, the negative output terminal of bridge rectifier circuit BR1 is connected with the pin 2 of the second three terminal regulator U8, the pin 2 of the second three terminal regulator U8 is connected with the positive pole of the second diode D2, the negative pole of the second diode D2 is connected with the pin 3 of the second three terminal regulator U8(, the pin 3 of the second three terminal regulator U8 exports-15V direct supply, the pin 3 of the second three terminal regulator U8 is by the 4th filter capacitor C24 ground connection, 4th filter capacitor C24 two ends are parallel with the 6th electric capacity C6, 6th electric capacity C6 is for improving the transient response of load, the positive output end of bridge rectifier circuit BR1 is connected with the pin 1 of the first three terminal regulator U7, the pin 1 of the first three terminal regulator U7 is connected with the negative pole of the first diode D1, the positive pole of the first diode D1 is connected with the pin 3 of the first three terminal regulator U7, the pin 3 of the first three terminal regulator U7 exports+15V direct supply, the pin 3 of the first three terminal regulator U7 is by the 3rd filter capacitor C23 ground connection, the pin 3 of the first three terminal regulator U7 is connected with the pin 1 of the 3rd three terminal regulator U9 by the 9th resistance R9, the pin 3 of the 3rd three terminal regulator U9 exports+5V direct supply, the pin 3 of the 3rd three terminal regulator U9 is by the 5th filter capacitor C25 ground connection, the two ends of the 6th filter capacitor C25 are parallel with the 7th electric capacity C7, 7th electric capacity C7 is for improving the transient response of load, first three terminal regulator U7, the equal ground connection of earth terminal of the second three terminal regulator U8 and the 3rd three terminal regulator U9.This power module adopts the first three terminal regulator U7, the second three terminal regulator U8, the 3rd three terminal regulator U9 to obtain the stable dc power supply of+15V ,-15V and+5V respectively, and circuit is simple, and working stability is reliable.
Principle of work: input pre-set current value to single-chip microcomputer U1 by key-press module, corresponding signal is exported to display module and D/A modular converter after single-chip microcomputer U1 analyzing and processing, pre-set current value shows on display module, pre-set current value becomes analog voltage signal through the digital-to-analog conversion of D/A modular converter, analog voltage signal converts electric current to through constant-current source circuit, this electric current is actual output current value, and actual output current value can show on reometer.The voltage at sampling resistor R1 two ends amplifies through the second operational amplifier U6 successively as feedback voltage, be transported in single-chip microcomputer U1 after the conversion of A/D modular converter, the voltage at pull-up resistor RL two ends amplifies through the 3rd operational amplifier U4 as the reference voltage, be transported in single-chip microcomputer U1 after the conversion of A/D modular converter, single-chip microcomputer U1 compares analysis to feedback voltage and reference voltage and obtains error voltage, this error voltage is transported to output adjusting module through D/A modular converter, this error voltage exports the conducting degree controlling field effect transistor Q1 after the first operational amplifier U5 amplifies, make the Step wise approximation of pre-set current value and actual output current value, until equal, thus reach the object of numerical control.
Claims (6)
1. a SCM Based Digital Control Direct Current Source device, comprise single-chip microcomputer, D/A modular converter, export adjusting module, A/D modular converter, power module, key-press module and display module, described power module is used for providing direct supply for system works chip, the input end of described single-chip microcomputer connects the output terminal of key-press module and A/D modular converter, the output terminal of single-chip microcomputer is connected with the input end of display module and D/A modular converter, the output terminal of described D/A modular converter is connected with the input end exporting adjusting module, the output terminal of described output adjusting module is connected with the input end of A/D modular converter, it is characterized in that: the output terminal of described single-chip microcomputer is also connected with alarm module, described alarm module comprises hummer and triode, the base stage of described triode is connected with the output terminal of single-chip microcomputer by the tenth resistance, transistor emitter connects power supply, the collector of triode is connected with hummer one end, hummer other end ground connection, described output adjusting module comprises constant-current source circuit, for gather actual output current value sample circuit and for providing the load circuit of high precision reference voltage, described constant-current source circuit comprises the first operational amplifier and field effect transistor, the normal phase input end of described first operational amplifier is connected with the output terminal of D/A modular converter, the cathode power supply termination power positive pole of the first operational amplifier, the negative power supply termination power negative pole of the first operational amplifier, the inverting input of the first operational amplifier is connected with the source electrode of field effect transistor, the output terminal of the first operational amplifier is connected with the grid of field effect transistor by the second resistance, the source electrode of described field effect transistor is connected with sample circuit, the drain electrode of field effect transistor is connected with load circuit.
2. SCM Based Digital Control Direct Current Source device as claimed in claim 1, it is characterized in that: described sample circuit comprises sampling resistor and the second operational amplifier for gathering sampling resistor both end voltage, described sampling resistor first end is connected with the source electrode of field effect transistor, second end of sampling resistor is connected with the positive pole of reometer, the minus earth of described reometer, reometer is for showing actual output current value, the 5th electric capacity is parallel with between the first end of sampling resistor and the negative pole of reometer, the described normal phase input end of the second operational amplifier is connected with the first end of sampling resistor, the cathode power supply termination power positive pole of the second operational amplifier, the negative power supply termination power negative pole of the second operational amplifier, the inverting input of the second operational amplifier is connected with the output terminal of the second operational amplifier, the output terminal of the second operational amplifier is connected with the input end of A/D modular converter.
3. SCM Based Digital Control Direct Current Source device as claimed in claim 2, it is characterized in that: described load circuit comprises pull-up resistor and the 3rd operational amplifier, described pull-up resistor first end is connected with the drain electrode of field effect transistor, second end of pull-up resistor is connected with 15V power supply, pull-up resistor first end is connected with the inverting input of the 3rd operational amplifier by the 4th resistance, second end of pull-up resistor is connected with the normal phase input end of the 3rd operational amplifier by the 5th resistance, the cathode power supply termination power positive pole of described 3rd operational amplifier, the negative power supply termination power negative pole of the 3rd operational amplifier, the normal phase input end of the 3rd operational amplifier is also by the 3rd resistance eutral grounding, described 3rd resistance two ends are parallel with the 4th electric capacity, the inverting input of the 3rd operational amplifier is connected with the output terminal of the 3rd operational amplifier by the 6th resistance, the inverting input of the 3rd operational amplifier is connected with the input end of A/D modular converter.
4. SCM Based Digital Control Direct Current Source device as claimed in claim 3, is characterized in that: described key-press module comprise "+" button, "-" button, " OK " button, " SET " button, " DEL " button, " RESET/ON " button and 0 ~ 9 nine numeric input keys.
5. SCM Based Digital Control Direct Current Source device as claimed in claim 4, it is characterized in that: described display module adopts LM016L LCDs, the difference of display module display pre-set current value, actual output current value and pre-set current value and actual output current value.
6. SCM Based Digital Control Direct Current Source device as claimed in claim 5, it is characterized in that: described power module provides direct supply for system works chip, power module circuitry comprises transformer, the bridge rectifier circuit of four diode compositions, five filter capacitors and three three terminal regulators, one termination civil power of described transformer, another termination bridge rectifier circuit, civil power converts direct current to through bridge rectifier circuit again after transformer pressure-reducing, the positive pole of positive output termination first filter capacitor of bridge rectifier circuit, the negative pole of the first filter capacitor connects the positive pole of the second filter capacitor, the plus earth of the second filter capacitor, the negative pole of the second filter capacitor connects the negative output terminal of bridge rectifier circuit, the negative output terminal of bridge rectifier circuit is connected with the input end of the second three terminal regulator, the input end of described second three terminal regulator is connected with the positive pole of the second diode, the negative pole of described second diode is connected with the output terminal of the second three terminal regulator, the output terminal of the second three terminal regulator exports-15V direct supply, the output terminal of the second three terminal regulator is by the 4th filter capacitor ground connection, described 4th filter capacitor two ends are parallel with the 6th electric capacity, the positive output end of bridge rectifier circuit is connected with the input end of the first three terminal regulator, the input end of described first three terminal regulator is connected with the negative pole of the first diode, the positive pole of described first diode is connected with the output terminal of the first three terminal regulator, the output terminal of the first three terminal regulator exports+15V direct supply, the output terminal of the first three terminal regulator is by the 3rd filter capacitor ground connection, the output terminal of the first three terminal regulator is connected with the input end of the 3rd three terminal regulator by the 9th resistance, the output terminal of the 3rd three terminal regulator exports+5V direct supply, the output terminal of the 3rd three terminal regulator is by the 5th filter capacitor ground connection, the two ends of described 5th filter capacitor are parallel with the 7th electric capacity, described first three terminal regulator, the equal ground connection of earth terminal of the second three terminal regulator and the 3rd three terminal regulator.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105892544A (en) * | 2016-05-31 | 2016-08-24 | 成都九十度工业产品设计有限公司 | High-precision intelligent direct-current power supply system and method |
| CN105955378A (en) * | 2016-07-04 | 2016-09-21 | 广东海洋大学 | High-precision current source |
| CN106102360A (en) * | 2016-08-23 | 2016-11-09 | 合肥博雷电气有限公司 | A kind of SCM Based Digital Control Direct Current Source device |
| CN107414310A (en) * | 2017-08-25 | 2017-12-01 | 温州舒尔达工艺钮扣有限公司 | A kind of fully-automatic laser car button machine and processing method |
| CN113359923A (en) * | 2021-06-23 | 2021-09-07 | 吉林大学 | Digital controlled DC voltage-stabilized source |
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2015
- 2015-12-14 CN CN201521027515.7U patent/CN205193648U/en not_active Expired - Fee Related
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| CN105892544A (en) * | 2016-05-31 | 2016-08-24 | 成都九十度工业产品设计有限公司 | High-precision intelligent direct-current power supply system and method |
| CN105955378A (en) * | 2016-07-04 | 2016-09-21 | 广东海洋大学 | High-precision current source |
| CN106102360A (en) * | 2016-08-23 | 2016-11-09 | 合肥博雷电气有限公司 | A kind of SCM Based Digital Control Direct Current Source device |
| CN107414310A (en) * | 2017-08-25 | 2017-12-01 | 温州舒尔达工艺钮扣有限公司 | A kind of fully-automatic laser car button machine and processing method |
| CN107414310B (en) * | 2017-08-25 | 2019-08-06 | 温州舒尔达工艺钮扣有限公司 | A kind of fully-automatic laser vehicle button machine and processing method |
| CN113359923A (en) * | 2021-06-23 | 2021-09-07 | 吉林大学 | Digital controlled DC voltage-stabilized source |
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