CN208272867U - A kind of adjustable D. C regulated for dual power supply control system - Google Patents
A kind of adjustable D. C regulated for dual power supply control system Download PDFInfo
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- CN208272867U CN208272867U CN201820991606.XU CN201820991606U CN208272867U CN 208272867 U CN208272867 U CN 208272867U CN 201820991606 U CN201820991606 U CN 201820991606U CN 208272867 U CN208272867 U CN 208272867U
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Abstract
The utility model discloses a kind of adjustable D. C regulateds for dual power supply control system; including positive electricity source follower circuit, negative electricity source follower circuit, auxiliary power circuit and short-circuit protection circuit; the short-circuit protection circuit includes NE555 timing chip, switching tube Q1 and RC differential circuit; short-circuit differential trigger signal is received by NE555; quickly disconnect corresponding relay; achieve the purpose that short-circuit protection; the short-circuit protection circuit fast response time, has been effectively ensured the safety of adjustable D. C regulated；The utility model acquires output voltage signal using ADC0804 analog/digital conversion chip, is handled by single-chip microcontroller, and controls liquid crystal display display output positive and negative direct current voltage value, and compared to traditional numeral method, liquid crystal display has many advantages, such as that energy conservation, control are simple；The characteristics of using single-chip microcontroller as control core, small in size, light-weight, small power consumption, more new procedures are convenient, embody intelligence, meet modern equipment.
Description
Technical field
The utility model belongs to electronic technology field more particularly to a kind of adjustable DC for dual power supply control system is steady
Voltage source.
Background technique
In university experimental teaching, electrical experiments be unable to do without adjustable D.C. regulated power supply, especially in some control systems
In, it is most of to require dual power supply, for example, operational amplifier requires positive-negative power etc..Common D.C. regulated power supply generallys use
Charactron or pointer watch dial show that energy consumption is high, volume is big, stability is poor, protectiveness is poor, short-circuit, overcurrent easily causes damage.
Application No. is the applications for a patent for invention of CN201511010451.4, disclose a kind of D.C. regulated power supply, the power supply
The features such as using the fixed integrated regulator in three ends, short with the development cycle, high-efficient, stability is strong, at low cost, but it is exported
Voltage is unadjustable, shows without short-circuit protection, without numerical value；Application No. is the applications for a patent for invention of CN201710566092.3, public
A kind of positive-negative power with short-circuit protection function is opened, the short-circuit protection of the power supply is come by comparing the variation of output voltage
Identification short circuit, and corresponding output is turned off by switching transistor, quick response cannot be accomplished to short circuit；Application No. is
CN201420550092.6. utility model patent discloses a kind of adjustable DC-stabilized circuit of output voltage, thirdly
The output end of end integrated regulator offsets the minimum output voltage of three terminal integrated voltage stabilizer output by voltage compensating circuit
1.25V realizes that output voltage is adjustable since 0V, according to the description of the program, because the output voltage of three terminal integrated voltage stabilizer is
1.25V, the conduction voltage drop of diode are not less than 0.6V, if therefore three terminal integrated voltage stabilizer less than two diodes of output voltage
Conduction voltage drop, then diode is not turned on, output voltage 0V.However, the conduction voltage drop of diode is by environment temperature and flows through
Electric current influence, and be not fixed.Even if the conduction voltage drop of silicon class diode is not less than 0.6V as described in it, if its use two
Pole pipe conduction voltage drop is between (0.6-0.625) V, at this point, two diodes are connected always, the voltage of final output is consistently greater than
0, it can not really realize that output is 0V.Therefore, whether the program can really realize that output voltage must be discussed from 0V adjustable value.
Based on this, the utility model proposes one kind to have strong stability, small in size, liquid crystal display, fast short-circuit protective etc.
The adjustable positive-negative power of characteristic, to meet requirement of the dual power supply control system to power supply.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of adjustable DC pressure stabilizing for dual power supply control system
Power supply.
The utility model is to solve above-mentioned technical problem by the following technical solutions: one kind controls for dual power supply
The adjustable D. C regulated of system, including positive electricity source follower circuit, negative electricity source follower circuit, auxiliary power circuit and short circuit
Protect circuit；
The positive electricity source follower circuit is electric by normally-closed contact and the positive supply load of positive supply relay J1, short-circuit protection
Road connection；The negative electricity source follower circuit is electric by normally-closed contact and the negative supply load of negative supply relay J2, short-circuit protection
Road connection；
The input terminal of the auxiliary power circuit is connected with the output end of accessory power supply rectification circuit, auxiliary power circuit
Output end is connect with the coil of positive supply relay J1, the coil of negative supply relay J2 and short-circuit protection circuit, for for
Power supply needed for each circuit provides；
The short-circuit protection circuit includes NE555 timing chip, switching tube Q1, bleeder circuit, RC differential circuit and hair
Optical diode LED1；
One end of the RC differential circuit is connect with positive supply load anode, and the output end and NE555 of RC differential circuit are fixed
When chip triggering end connected with reset terminal；The other end of the RC differential circuit is grounded；One end of the bleeder circuit and negative
The connection of power source loads negative terminal, the partial pressure end of bleeder circuit are connect with the anode of diode D11；The cathode of the diode D11 with
The base stage of switching tube Q1 connects, the emitter ground connection of switching tube Q1, the collector of switching tube Q1 and one end, the capacitor C7 of resistance R9
Cathode connection；One end connection of the other end, resistance R7 of the other end and bleeder circuit of the resistance R9, resistance R7's is another
End is connect with the output end of RC differential circuit；The anode of the capacitor C7 connects with the triggering end and reset terminal of NE555 timing chip
It connects；The output end of the NE555 timing chip is connect by resistance R11 with the anode of Light-emitting diode LED 1, light emitting diode
The cathode of LED1 is grounded；The discharge end of the NE555 timing chip and coil, the negative supply relay J2 of positive supply relay J1
Coil one end connection, the coil of positive supply relay J1, the other end of the coil of negative supply relay J2 and the auxiliary
The output end of power circuit connects.
Further, the adjustable D. C regulated further includes positive supply sample circuit, negative supply sample circuit, monolithic
Machine processing circuit and liquid crystal display circuit；The input terminal of the positive supply sample circuit is connect with positive supply load anode, just
The output end of power supply sample circuit is connect with the single-chip microcontroller processing circuit；The input terminal of the negative supply sample circuit passes through fortune
It calculates amplifier to connect with negative supply load anode, the output end of negative supply sample circuit is connect with the single-chip microcontroller processing circuit；
The single-chip microcontroller processing circuit is connect with liquid crystal display circuit；
The positive supply sample circuit, negative supply sample circuit, single-chip microcontroller processing circuit and liquid crystal display circuit also with
The output end of the auxiliary power circuit connects；
The output voltage grade of auxiliary power circuit is different, positive supply sample circuit, negative supply sample circuit, at single-chip microcontroller
Reason circuit and liquid crystal display circuit are connect with the output end of auxiliary power circuit respectively according to required voltage；
Using single-chip microcontroller as control core, small in size, light-weight, small power consumption, more new procedures are convenient；Liquid crystal display
Display has many advantages, such as that energy conservation, control are simple.
Further, the positive supply sample circuit and negative supply sample circuit are all made of the modulus of model ADC0804
Conversion chip.
Further, the positive supply sample circuit is connected by potentiometer W3 and resistance R4 and positive supply load；It is described
The both ends of potentiometer W3 are parallel to positive supply load, and the sliding end of potentiometer W3 is connected by resistance R4 and positive supply sample circuit
It connects, to prevent, positive supply sample circuit input current is excessive and burns circuit.
Further, the negative supply sample circuit is connect by potentiometer W4 and resistance R14 with operational amplifier；It is described
The both ends of potentiometer W4 are parallel to the output end of operational amplifier, and the sliding end of potentiometer W4 is adopted by resistance R14 with negative supply
Sample circuit connection, to prevent, negative supply sample circuit input current is excessive and burns circuit.
Further, the positive electricity source follower circuit includes sequentially connected transformer, positive supply rectification circuit, positive supply
Filter circuit, positive supply clamp circuit, the source-series bleeder circuit of positive electricity, positive supply voltage regulator circuit and positive supply output adjust electricity
Road；
The positive supply clamp circuit be by the consistent diode D1/D2/D3 of three polar orientations it is in series first
Series circuit；The source-series bleeder circuit of positive electricity includes resistance R2, potentiometer W1, diode D5, D6, the resistance R2 and electricity
Position device W1 the second series circuit in series, diode D5 third series circuit in series consistent with D6 polar orientation；Second
One end of series circuit is connect with the cathode of the first series circuit, the other end of the second series circuit and the yin of third series circuit
Pole connection, the plus earth of the anode and third series circuit of the first series circuit.
Further, the negative electricity source follower circuit includes sequentially connected transformer, negative supply rectification circuit, negative supply
Filter circuit, negative supply clamp circuit, the source-series bleeder circuit of negative electricity, negative supply voltage regulator circuit and negative supply output adjust electricity
Road；
The negative supply clamp circuit be by the consistent diode D12/D13/D14 of three polar orientations it is in series
Four series circuits；The source-series bleeder circuit of negative electricity includes resistance R23, potentiometer W6, diode D15, D16, the resistance
R23 and potentiometer W6 the 5th series circuit in series, diode D15 the 6th series connection in series consistent with D16 polar orientation
Circuit；One end of 5th series circuit is connect with the anode of the 4th series circuit, the other end of the 5th series circuit and the 6th string
Join the anode connection of circuit, the minus earth of the cathode and the 6th series circuit of the 4th series circuit.
Further, the auxiliary power circuit includes sequentially connected tertiary voltage conversion circuit, and the first step voltage turns
The output voltage for changing circuit is+18V, and the output voltage of second level voltage conversion circuit is+15V, third level voltage conversion circuit
Output voltage be+5V, be respectively used to provide required power supply for each circuit.
Compared with prior art, the adjustable DC pressure stabilizing electricity provided by the utility model for dual power supply control system
Source, including positive electricity source follower circuit, negative electricity source follower circuit, auxiliary power circuit and short-circuit protection circuit, the short circuit are protected
Protection circuit includes NE555 timing chip, switching tube Q1 and RC differential circuit, receives short-circuit differential trigger signal by NE555,
Corresponding relay is quickly disconnected, achievees the purpose that short-circuit protection, the short-circuit protection circuit fast response time, being effectively ensured can
The safety of tuning DC voltage-stabilized source；
The utility model acquires output voltage signal using ADC0804 analog/digital conversion chip, is handled by single-chip microcontroller, and
Liquid crystal display display output positive and negative direct current voltage value is controlled, compared to traditional numeral method, liquid crystal display has energy conservation, control
The advantages that simple；Using single-chip microcontroller as control core, small in size, light-weight, small power consumption, more new procedures are convenient, embody intelligence
The characteristics of changing, meeting modern equipment；
The positive electricity source follower circuit and negative electricity source follower circuit of the utility model utilize clamp circuit and series connection partial pressure electricity
Road is continuously adjusted since 0V from positive supply output and negative supply output is truly realized.
Detailed description of the invention
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution of the utility model
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only one embodiment of the utility model, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of circuit diagram of the adjustable D. C regulated for dual power supply control system of the utility model；
Fig. 2 is the circuit diagram of the utility model short-circuit protection circuit；
Fig. 3 is the circuit diagram of the utility model transformer and rectification circuit；
Fig. 4 is the circuit diagram of the utility model positive electricity source follower circuit；
Fig. 5 is the circuit diagram of the utility model negative electricity source follower circuit；
Fig. 6 is the circuit diagram of the utility model auxiliary power circuit.
Specific embodiment
Below with reference to the attached drawing in the utility model embodiment, to this implement the technical solution in novel carry out it is clear, complete
Site preparation description, it is clear that the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative labor
Every other embodiment, fall within the protection scope of the utility model.
As shown in Figure 1, a kind of adjustable D. C regulated for dual power supply control system provided by the utility model,
Including positive electricity source follower circuit, negative electricity source follower circuit, auxiliary power circuit and short-circuit protection circuit；
Positive electricity source follower circuit is connected by normally-closed contact and the positive supply load of positive supply relay J1, short-circuit protection circuit
It connects；Negative electricity source follower circuit is connect by the normally-closed contact of negative supply relay J2 with negative supply load, short-circuit protection circuit；
The input terminal of auxiliary power circuit is connected with the output end (end E/F) of accessory power supply rectification circuit, accessory power supply electricity
The output end on road is connect with the coil of positive supply relay J1, the coil of negative supply relay J2 and short-circuit protection circuit, is used
In providing required power supply for each circuit.
As shown in Fig. 2, short-circuit protection circuit includes NE555 timing chip, switching tube Q1, bleeder circuit, RC differential circuit
And Light-emitting diode LED 1；Bleeder circuit is connected in series by resistance R5 and R6, and RC differential circuit is gone here and there by capacitor C8 and resistance R8
Join；
The anode of capacitor C8 is connect with positive supply load anode, one end, the NE555 timing of the cathode and resistance R8 of capacitor C8
The triggering end (2 foot) and reset terminal (6 foot) of chip connect；The other end of resistance R8 is grounded；One end of resistance R5 and negative supply are negative
End connection is loaded with, the other end is connect with the anode of one end of resistance R6, diode D11；The cathode and switching tube Q1 of diode D11
Base stage connection, the emitter ground connection of switching tube Q1, one end of the collector of switching tube Q1 and resistance R9, the cathode of capacitor C7 connect
It connects；The other end of resistance R9 is connect with one end of the other end of resistance R6, resistance R7, the other end of resistance R7 and the one of resistance R8
End connection；The anode of capacitor C7 is connect with the triggering end (2 foot) of NE555 timing chip and reset terminal (6 foot)；NE555 timing core
The output end (3 foot) of piece is connect by resistance R11 with the anode of Light-emitting diode LED 1, and the cathode of Light-emitting diode LED 1 connects
Ground；The coil of the discharge end (7 foot) of NE555 timing chip and positive supply relay J1, negative supply relay J2 coil one
End connection, the output of the coil, the other end and auxiliary power circuit of the coil of negative supply relay J2 of positive supply relay J1
End connection.
When positive supply loads shorted to earth, by C8, R8 differential circuit (in fact, capacitance voltage cannot be mutated so that
The voltage dramatic decrease of 2 foot of triggering end) it generates a differential signal and is sent to NE555 and trigger the 2nd foot and the 6th foot, make NE555 set,
High level is generated in 3 feet, LED1 is connected, prompts short circuit；Make positive supply relay J1's in the high level that 7 feet generate simultaneously
Coil cannot get electricity, and the normally-closed contact of positive supply relay J1 can not be attracted, and positive electricity source follower circuit and load disconnect, short circuit event
Barrier excludes.
When negative supply loads shorted to earth, so that Q1 base stage is obtained positive bias by R5, R6 partial pressure, Q1 is connected rapidly,
Q1 collector potential reduces rapidly, since C7 voltage cannot be mutated, so that 2 foot voltage dramatic decreases, make NE555 set, in 3 feet
High level is generated, LED1 is connected, prompts short circuit；Make the coil of negative supply relay J2 in the high level that 7 feet generate simultaneously
It cannot get electricity, the normally-closed contact of negative supply relay J2 can not be attracted, and negative electricity source follower circuit and load disconnect, short trouble row
It removes.
As shown in Figure 1, the adjustable D. C regulated of the utility model further includes positive supply sample circuit, negative electricity source sampling
Circuit, single-chip microcontroller processing circuit and liquid crystal display circuit；Input terminal and positive supply the load anode of positive supply sample circuit connect
It connects, the output end of positive supply sample circuit is connect with single-chip microcontroller processing circuit；The input terminal of negative supply sample circuit passes through operation
Amplifier is connect with negative supply load anode, and the output end of negative supply sample circuit is connect with single-chip microcontroller processing circuit；Single-chip microcontroller
Processing circuit is connect with liquid crystal display circuit；
Positive supply sample circuit, negative supply sample circuit, single-chip microcontroller processing circuit and liquid crystal display circuit also respectively with
The output end of auxiliary power circuit connects.
Positive supply sample circuit and negative supply sample circuit are all made of the modulus conversion chip of model ADC0804, differentiate
Rate is 8, conversion time 100us, has ternary output data latches in chip, can be directly connected on the data bus.
The single-chip microcontroller model STC89C52 that single-chip microcontroller processing circuit uses, and pass through 1602 liquid crystal displays display output positive and negative direct current voltage
Value.The every row of 1602 liquid crystal displays shows 16 characters, totally two rows, is driven by the P0 mouth input information of single-chip microcontroller, because P0 mouthfuls
It is OC open collector gate circuits, so in row's resistance of P0 mouthfuls plus one pull-up 10K, such P0 mouthfuls of data can add
To 1602 liquid crystal displays.Liquid crystal display is powered (5V) by auxiliary power circuit, and the data-/ command of liquid crystal display selects end
4th foot is by the 13rd foot control system of single-chip microcontroller；The 6th foot of liquid crystal display enable end, by the 14th foot control system of single-chip microcontroller；Because merely entering number
According to so the 5th foot of liquid crystal display is grounded；Liquid crystal display the 7th foot to the 14th foot connects P0 mouthfuls, reads the electricity of single-chip microcontroller acquisition
Press numerical value.
Using STC89C52 single chip as control core, small in size, light-weight, small power consumption, more new procedures are convenient；Liquid
Crystal display screen, which is shown, has many advantages, such as that energy conservation, control are simple.The straight-adjustable made using the technical solution of the utility model
It is in kind to flow regulated power supply, through actual measurement, having a size of 180*160*80 (containing transformer), complete machine consumes power 1.5W.
As shown in Figure 1, positive supply sample circuit is connected by potentiometer W3 and resistance R4 and positive supply load；Potentiometer W3
Both ends be parallel to positive supply load, the sliding end of potentiometer W3 is connect by resistance R4 with positive supply sample circuit, to prevent
Positive supply sample circuit input current is excessive and burns circuit.
By the both ends of potentiometer W3 and in positive electricity source output terminal (end U0 and ground terminal), one resistance R4 of sliding end series connection is connected to
The 6th foot VIN foot of U1 is, it can be achieved that sampling of the A/D converter to output voltage.The purpose of R4 is the electric current for limiting the end VIN, is prevented
Electric current is excessive and burns chip.11 feet of U1 connect P2 mouthfuls of single-chip microcontroller to 18 feet, and 2 feet (RD) connect 17 foot of single-chip microcontroller, 3 feet (WR) order
16 foot of piece machine, 1 foot (CS) connects 15 foot of single-chip microcontroller, once CS is effective, shows that A/D is selected, can start work.R20 and C15 is formed
The clock of U1, accesses 19 feet, and frequency is 1/ (1.1RC)；9 feet be the 5V voltage that is provided by LM7805 auxiliary power circuit again
It is divided by resistance R15 and R16, to provide reference voltage when chip interior work, determines quantization unit.Once work,
The program that single-chip microcontroller just presses write-in carries out A/D conversion.
As shown in Figure 1, negative supply sample circuit is connect by potentiometer W4 and resistance R14 with operational amplifier；Potentiometer
The both ends of W4 are parallel to the output end of operational amplifier, and the sliding end of potentiometer W4 passes through resistance R14 and negative supply sample circuit
Connection, to prevent, negative supply sample circuit input current is excessive and burns circuit.The model LM358 of operational amplifier is used
Negative supply voltage reverse phase etc. than amplifying, is realized negative voltage sampling by ADC0804 (U2) by LM358.
Negative supply -15V is connected to the 6th foot of operational amplifier LM358 through R12, and 6 foot reverse side and 7 foot output ends are indirectly
R13 keeps it equal than reverse phase amplification, 7 foot output+15V voltages.
By the both ends of potentiometer W4 and in negative electricity source output terminal (end U0 and ground terminal), one resistance R14 of sliding end series connection is connect
To U2 the 6th foot VIN foot, it can be achieved that sampling of the A/D converter to output voltage.The purpose of R14 is the electric current for limiting the end VIN,
Prevent that electric current is excessive and burns chip.11 feet of U2 connect P1 mouthfuls of single-chip microcontroller to 18 feet, and 2 feet (RD) connect 11 foot of single-chip microcontroller, 3 feet (WR)
12 foot of single-chip microcontroller is connect, 1 foot (CS) connects 10 foot of single-chip microcontroller, once CS is effective, shows that A/D is selected, can start work.R19 and C12
The clock of U2 is formed, 19 feet are accessed, frequency is 1/ (1.1RC)；9 feet be the 5V voltage that is provided by LM7805 accessory power supply again
It is divided by resistance R20 and R21, to provide reference voltage when chip interior work, determines quantization unit.Once work,
The program that single-chip microcontroller just presses write-in carries out A/D conversion.
As shown in figure 3, the adjustable D. C regulated of the utility model uses the transformer T1 of three groups of taps, T1's
Input terminal is electrically connected with outside 220V exchange, and it is whole that three groups of taps L1, L2, L3 pass through positive supply rectification circuit B1, negative supply respectively
Be positive power output circuit, negative electricity source follower circuit and auxiliary power circuit of current circuit B2, accessory power supply rectification circuit B3 mentions
For input power.
As shown in figure 4, positive electricity source follower circuit includes sequentially connected transformer T1, positive supply rectification circuit B1, positive electricity
Power filter, positive supply clamp circuit, the source-series bleeder circuit of positive electricity, positive supply voltage regulator circuit and positive supply output are adjusted
Circuit；
Positive supply clamp circuit is first series connection in series by three polar orientations consistent diode D1, D2, D3
Circuit；The source-series bleeder circuit of positive electricity includes resistance R2, potentiometer W1, diode D5, D6, and resistance R2 and potentiometer W1 connect structure
At the second series circuit, diode D5 third series circuit in series consistent with D6 polar orientation；The one of second series circuit
End is connect with the cathode of the first series circuit, and the other end of the second series circuit is connect with the cathode of third series circuit, and first
The plus earth of the anode and third series circuit of series circuit.
Positive supply voltage regulator circuit is using voltage stabilizing chip LM317 as core, and 2 feet of LM317 are 1.25V with respect to 1 foot voltage, D1's
The current potential at the end B is clamped to -1.8V using 3 diodes D1, D2, D3, then is connected by R2 and W1 with D5, D6 by plus earth
Partial pressure, when being shorted W2, the resistance value for adjusting W1 changes electric current, reaches to voltage trim, makes the 1 foot voltage -1.25V of LM317, i.e.,
2 feet of LM317 exportable voltage 0V, it is adjustable from 0V from voltage is truly realized.
R3 takes 250 Ω, then the electric current for flowing through R3 is 1.25V/250 Ω=5mA.The electric current very little of LM317 adjustment end is flowed through,
Almost it can be ignored.So positive supply output end voltageW2 selects the potentiometer of 3K that can make positive supply
Output, can meet demand from 0-15V consecutive variations.In view of 2 feet of LM317 and the voltage at 1 foot both ends are small near 1.25V
Range is floated, then can be by changing the resistance value of R3, and the electric current that flow through R3 is constant for 5mA, by adjusting W2, makes output from 0-
15V consecutive variations.The positive electricity source follower circuit provides negative voltage to LM317 using clamp circuit and series connection bleeder circuit.
Due to consideration that the relationship of diode conduction voltage drop and circuital current, can accurately adjust voltage, making LM317 output is 0V, equally
Suitable for negative electricity source follower circuit.
As shown in figure 5, negative electricity source follower circuit includes sequentially connected transformer T1, negative supply rectification circuit B2, negative electricity
Power filter, negative supply clamp circuit, the source-series bleeder circuit of negative electricity, negative supply voltage regulator circuit and negative supply output are adjusted
Circuit；
Negative supply clamp circuit is fourth string in series by three polar orientations consistent diode D12, D13, D14
Join circuit；The source-series bleeder circuit of negative electricity includes resistance R23, potentiometer W6, diode D15, D16, resistance R23 and potentiometer W6
5th series circuit in series, diode D15 the 6th series circuit in series consistent with D16 polar orientation；5th series connection
One end of circuit is connect with the anode of the 4th series circuit, and the other end of the 5th series circuit and the anode of the 6th series circuit connect
It connects, the minus earth of the cathode and the 6th series circuit of the 4th series circuit.
For negative supply voltage regulator circuit using voltage stabilizing chip LM337 as core, 3 feet of LM337 are -1.25V, D12 with respect to 1 foot voltage
Cathode ground connection, the current potential at the end D is clamped to+1.8V using 3 diodes D12, D13, D14, then by R23 and W6 and D15,
D16 series connection partial pressure, when being shorted W7, adjusting W6 makes the exportable voltage 0V of 3 feet of 1 foot voltage+1.25V, i.e. LM337 of LM337.
R24 takes 250 Ω, then the electric current for flowing through R3 is -1.25V/250 Ω=- 5mA.Flow through the electric current of LM337 adjustment end very
It is small, almost it can be ignored.So positive supply output end voltageW7 selects the potentiometer of 3K that can make
Positive supply is exported from 0- (- 15V) consecutive variations, can meet demand.In view of LM337 3 feet and 1 foot both ends voltage-
1.25V nearby float by small range, then can be by changing the resistance value of R24, and the electric current that flow through R24 is constant for -5mA, passes through adjusting
W7 makes output from 0- (- 15V) consecutive variations.
As shown in fig. 6, auxiliary power circuit includes sequentially connected tertiary voltage conversion circuit, the first step voltage conversion electricity
Road uses LM7818, and output voltage is+18V；Second level voltage conversion circuit uses LM7815, and output voltage is+15V；
Third level voltage conversion circuit uses LM7805, and output voltage is+5V, is respectively used to provide required power supply for each circuit.
Above disclosed is only specific embodiment of the present utility model, but the protection scope of the utility model not office
It is limited to this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in change
Change or modification, should be covered within the scope of the utility model.
Claims (8)
1. a kind of adjustable D. C regulated for dual power supply control system, it is characterised in that: including positive electricity source follower circuit,
Negative electricity source follower circuit, auxiliary power circuit and short-circuit protection circuit；
The positive electricity source follower circuit is connected by normally-closed contact and the positive supply load of positive supply relay J1, short-circuit protection circuit
It connects；The negative electricity source follower circuit is connected by normally-closed contact and the negative supply load of negative supply relay J2, short-circuit protection circuit
It connects；
The input terminal of the auxiliary power circuit is connected with the output end of accessory power supply rectification circuit, the output of auxiliary power circuit
End is connect with the coil of positive supply relay J1, the coil of negative supply relay J2 and short-circuit protection circuit；
The short-circuit protection circuit includes NE555 timing chip, switching tube Q1, bleeder circuit, RC differential circuit and luminous two
Pole pipe LED1；
One end of the RC differential circuit is connect with positive supply load anode, the output end and NE555 timing core of RC differential circuit
The triggering end of piece is connected with reset terminal；The other end of the RC differential circuit is grounded；One end of the bleeder circuit and negative supply
Negative terminal connection is loaded, the partial pressure end of bleeder circuit is connect with the anode of diode D11；The cathode and switch of the diode D11
The base stage of pipe Q1 connects, the emitter ground connection of switching tube Q1, one end of the collector of switching tube Q1 and resistance R9, capacitor C7 it is negative
Pole connection；The other end of the other end of the resistance R9 and bleeder circuit, resistance R7 one end connect, the other end of resistance R7 with
The output end of RC differential circuit connects；The anode of the capacitor C7 is connect with the triggering end of NE555 timing chip and reset terminal；Institute
The output end for stating NE555 timing chip is connect by resistance R11 with the anode of Light-emitting diode LED 1, Light-emitting diode LED 1
Cathode ground connection；The discharge end of the NE555 timing chip and the coil of positive supply relay J1, the coil of negative supply relay J2
One end connection, the coil of positive supply relay J1, the other end of the coil of negative supply relay J2 and accessory power supply electricity
The output end on road connects.
2. adjustable D. C regulated as described in claim 1, it is characterised in that: further include positive supply sample circuit, negative electricity
Source sampling circuit, single-chip microcontroller processing circuit and liquid crystal display circuit；The input terminal and positive supply of the positive supply sample circuit
Anode connection is loaded, the output end of positive supply sample circuit is connect with the single-chip microcontroller processing circuit；The negative electricity source sampling electricity
The input terminal on road loads anode with negative supply by operational amplifier and connect, the output end of negative supply sample circuit and the monolithic
The connection of machine processing circuit；The single-chip microcontroller processing circuit is connect with liquid crystal display circuit；
The positive supply sample circuit, negative supply sample circuit, single-chip microcontroller processing circuit and liquid crystal display circuit also with it is described
The output end of auxiliary power circuit connects.
3. adjustable D. C regulated as claimed in claim 2, it is characterised in that: the positive supply sample circuit and negative supply
Sample circuit is all made of the modulus conversion chip of model ADC0804.
4. adjustable D. C regulated as claimed in claim 2 or claim 3, it is characterised in that: the positive supply sample circuit passes through
Potentiometer W3 and resistance R4 and positive supply load connect；The both ends of the potentiometer W3 are parallel to positive supply load, potentiometer W3
Sliding end connect with positive supply sample circuit by resistance R4.
5. adjustable D. C regulated as claimed in claim 2 or claim 3, it is characterised in that: the negative supply sample circuit passes through
Potentiometer W4 and resistance R14 are connect with operational amplifier；The both ends of the potentiometer W4 are parallel to the output end of operational amplifier,
The sliding end of potentiometer W4 is connect by resistance R14 with negative supply sample circuit.
6. adjustable D. C regulated as described in claim 1, it is characterised in that: the positive electricity source follower circuit includes successively
The transformer of connection, positive supply rectification circuit, positive electricity power filter, positive supply clamp circuit, the source-series bleeder circuit of positive electricity,
Positive supply voltage regulator circuit and positive supply output regulating circuitry；
The positive supply clamp circuit is first series connection in series by the consistent diode D1/D2/D3 of three polar orientations
Circuit；The source-series bleeder circuit of positive electricity includes resistance R2, potentiometer W1, diode D5, D6, the resistance R2 and potentiometer
W1 the second series circuit in series, diode D5 third series circuit in series consistent with D6 polar orientation；Second series connection
One end of circuit is connect with the cathode of the first series circuit, and the other end of the second series circuit and the cathode of third series circuit connect
It connects, the plus earth of the anode and third series circuit of the first series circuit.
7. adjustable D. C regulated as described in claim 1, it is characterised in that: the negative electricity source follower circuit includes successively
The transformer of connection, negative supply rectification circuit, negative electricity power filter, negative supply clamp circuit, the source-series bleeder circuit of negative electricity,
Negative supply voltage regulator circuit and negative supply output regulating circuitry；
The negative supply clamp circuit is fourth string in series by the consistent diode D12/D13/D14 of three polar orientations
Join circuit；The source-series bleeder circuit of negative electricity includes resistance R23, potentiometer W6, diode D15, D16, the resistance R23 and
Potentiometer W6 the 5th series circuit in series, diode D15 the 6th series circuit in series consistent with D16 polar orientation；
One end of 5th series circuit is connect with the anode of the 4th series circuit, the other end and the 6th series circuit of the 5th series circuit
Anode connection, the minus earth of the cathode and the 6th series circuit of the 4th series circuit.
8. adjustable D. C regulated as described in claim 1, it is characterised in that: the auxiliary power circuit includes successively connecting
The tertiary voltage conversion circuit connect, the output voltage of first order voltage conversion circuit are+18V, second level voltage conversion circuit
Output voltage is+15V, and the output voltage of third level voltage conversion circuit is+5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820991606.XU CN208272867U (en) | 2018-06-26 | 2018-06-26 | A kind of adjustable D. C regulated for dual power supply control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820991606.XU CN208272867U (en) | 2018-06-26 | 2018-06-26 | A kind of adjustable D. C regulated for dual power supply control system |
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| CN208272867U true CN208272867U (en) | 2018-12-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466686A (en) * | 2021-07-01 | 2021-10-01 | 西安铁路信号有限责任公司 | Programmable power supply and method for testing electrical characteristics of railway safety relay |
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2018
- 2018-06-26 CN CN201820991606.XU patent/CN208272867U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466686A (en) * | 2021-07-01 | 2021-10-01 | 西安铁路信号有限责任公司 | Programmable power supply and method for testing electrical characteristics of railway safety relay |
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Granted publication date: 20181221 Termination date: 20200626 |