CN102880214B - Two-end-serial self-powered digitally-controlled high-power direct-current adjustable current stabilizer - Google Patents
Two-end-serial self-powered digitally-controlled high-power direct-current adjustable current stabilizer Download PDFInfo
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- CN102880214B CN102880214B CN201210411587.6A CN201210411587A CN102880214B CN 102880214 B CN102880214 B CN 102880214B CN 201210411587 A CN201210411587 A CN 201210411587A CN 102880214 B CN102880214 B CN 102880214B
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Abstract
The invention discloses a two-end-serial self-powered digitally-controlled high-power direct-current adjustable current stabilizer, which comprises four application circuit modules, i.e., a power-amplifying and current-stabilizing feedback circuit (1), a precision stabilized voltage supply module (2), a digitally-controlled current-stabilizing adjusting module (3) and a current-stabilizing controlling and amplification driving module (4), which are connected with each other. According to the two-end-serial self-powered digitally-controlled high-power direct-current adjustable current stabilizer, high-power constant-current power supply with hundreds of volts of voltage can be realized, and the current stability is high; a large working voltage range and a load change range are realized; and digital control adjustment is performed, and a microcomputer control interface (TTL level) is reserved, so that intelligence and program control can be realized conveniently. An overvoltage protection function is realized, so that puncture of a power tube T caused by momentary high voltage is prevented. The two-end-serial self-powered digitally-controlled high-power direct-current adjustable current stabilizer has a very high practical value and a wide application prospect in the technical field of current-stabilized and voltage-stabilized circuit structures.
Description
Technical field
The present invention relates to a kind of two end tandem type self-powered numerical control high power DC adjustable constant current devices (structured flowchart as shown in Figure 1), device operating voltage can reach several hectovolts.Be particularly related in device and adopt accurate integrated regulator to form accurate power module of voltage regulation (2), and adopt digital regulation resistance composition digital current-regulation adjustment module (3), belong to current stabilization, voltage regulator circuit structure technical field.
Background technology
Conventionally stabilized current supply is to realize on the basis of stabilized voltage supply, and voltage stabilizing part generally adopts semiconductor voltage-stabilizing diode or the special voltage-stabilizing device of three ends as 78XX series forms, and during stabilized current supply work, should allow load short circuits.The stabilizing voltage characteristic of voltage stabilizing diode is poor, and the stabilized current supply effect of formation is bad.78XX series voltage-stabilizing device is withstand voltage be 40V, can not exceed 40V with the stabilized current supply input voltage of its formation, can only be used for the less or current stabilization electric current of pull-up resistor compared with circlet border.If require the operating voltage of stabilized current supply to reach hundreds of volts, its circuit structure complexity, cost is high.
The control section of this class stabilized current supply has special electric power system.If desired common high-voltage rectifier power source upgrading is become to high-power stabilized current supply, as coating machine power supply, adopt this class device can increase complicacy, design difficulty and the cost of manufacture of transformation.
The design's two end tandem type current stabilization circuits utilize the character of changing of resistence of pliotron or field effect transistor, according to the automatic regulation output of the variation of load or input voltage loop all-in resistance, reach steady flow result, control section power acquisition self-powered structure.
As shown in Figure 2, this stabilized current supply can directly insert in the former power supply system of DC source without voltage stabilization and current stabilization a kind of basic two end tandem type current stabilization circuits, realizes current stabilization power supply, as the constant current-supplying of the plated film to sputter coating machine or field coil.This current stabilization circuit maximum can be born the input voltage of approximate number hectovolt.
The function description of circuit shown in Fig. 2 is as follows:
Power amplification and current stabilization feedback: by power device T and sampling resistor Rf, be main element, T selects high-power MOS tube as current stabilization circuit adjustment pipe, directly be connected in direct current power supply loop, according to the automatic regulation output resistance of the variation of load or input voltage, reach the effect of current stabilization.Resistance R _ f is current stabilization sampling resistor, and current stabilization control signal is taken out from Rf, controls the output of VMOS pipe after prime amplifier relatively amplifies.
Stabilized voltage supply: formed by resistance R 3 and voltage stabilizing diode D.The stability of voltage stabilizing output has directly determined the current stability of current stabilization circuit.The stabilized circuit outputting voltage only consisting of R3 and D is large with current fluctuation, and stablizing effect is poor.
For improving voltage stability, generally adopt voltage stabilizing diode, circuit of three-terminal voltage-stabilizing integrated 78XX combination to realize voltage stabilizing.The major defect of the type circuit be working current more greatly, when input voltage increases, cause power consumption in resistance R 3 to increase rapidly, during practical application, operating voltage dynamic range is little, system power dissipation is larger.
Current stabilization regulates: by regulating the position of potentiometer W tap in Fig. 2 to change the current stabilization value of circuit.
Current stabilization control and amplification drive: improve current stabilization control sensitivity.Concrete structure can be with reference to figure 7.
Summary of the invention
The invention provides a kind of two end tandem type self-powered numerical control high power DC adjustable constant current devices, this device and the comparison of above-mentioned basic tandem type stabilized current supply, realized numerical control adjusting, and reserved microcomputer control interface (Transistor-Transistor Logic level), be convenient to realize intelligent and program control.Current stability is better; Permission is compared with high working voltage, compared with the working environment of heavy load resistance; Increased over-voltage protecting function, prevented that power tube T is because of the unexpected punch through damage that causes.This device can be realized the high high-power current stabilization power supply to a few hectovolt voltages.
A kind of two end tandem type self-powered numerical control high power DC adjustable constant current devices of the present invention, structured flowchart as shown in Figure 1, it comprises 4 application circuit modules: power amplification and current stabilization feedback circuit (1), accurate power module of voltage regulation (2), numerical control current stabilization adjustment module (3), current stabilization control and amplification driver module (4).They connect each other.
Fig. 3 has provided the physical circuit of two port constant-current stabilizers and components and parts model, specification.This device only has two port: V+ and V-.During application, v+ is connected with power supply "+" end, and V-is connected with load, and the other end of load is held and is connected with "-" of power supply.Device itself does not need independent power supply.
Device is provided with reverse connecting protection and overvoltage protection.Reverse connecting protection is realized by commutation diode D1, prevents that power port from connecing the anti-circuit damage that causes.Overvoltage protection is realized by voltage dependent resistor (VDR) RV, the not breakdown damage of protection power tube T.
D1 in figure: the commutation diodes such as optional 1N4007 (working current≤1A), or 1N540X as required (working current≤3A).RV: voltage dependent resistor (VDR), optional MYG type voltage dependent resistor (VDR), its nominal operation voltage should be lower than the voltage breakdown V of pipe T
dSS, desirable 0.7V
dSS.
Fig. 3 has provided position annexation and the connected mode between module.Accompanying drawing 4,5,6,7th, Fig. 3's cuts apart refinement, is convenient to the understanding of functions of modules.According to circuit in circuit lead define symbol or Fig. 4～7 in Fig. 3, draw port symbol, the position annexation between them is:
1. while working, in this constant-current stabilizer series connection access load circuit, diode D1 anode D+ is connected with device port V+, and negative terminal D-is connected with the Td end of circuit (1); Voltage dependent resistor (VDR) RV is connected in parallel on device port V+, V-two ends.V+ is connected with power supply "+" end, and V-end is connected with load, and the other end of load is connected with power supply "-" end.
2. the Td of power amplification and current stabilization feedback circuit (1) end is connected with protection diode D-end; input end Tin is connected with the output terminals A o that amplifies driver module (4) with current stabilization control; Rf+ end is connected with the In-end that amplifies driver module (4) with current stabilization control, and Rf-end is connected with this constant-current stabilizer V-end.
3. the end of the input Win in accurate power module of voltage regulation (2) is connected with protection diode negative terminal D-; common port W-is connected with the V-input end of this constant-current stabilizer; output Wo1 end is connected with the A+ end that amplifies driver module (4) with current stabilization control, and output Wo2 end is connected with the P+ end of numerical control current stabilization adjustment module (3).
4. the P+ of numerical control current stabilization adjustment module (3) end is connected with the Wo2 end of accurate power module of voltage regulation (2), and P-end is connected with the A-end that amplifies driver module (4) with current stabilization control.Pw end is connected with the IN+ end that amplifies driver module (4) with current stabilization control.
5. current stabilization control is connected with the Pw end in numerical control current stabilization adjustment module (3) with the positive input terminal IN+ of amplification driver module (4), and negative input end IN-is connected with the Rf+ of current stabilization feedback circuit (1) with power amplification; The input Tin end of Ao termination circuit (1), the Wo1 end of the accurate power module of voltage regulation of A+ termination (2), A-end is connected with this constant-current stabilizer V-end.
Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 circuit working is described as follows:
Described power amplification and current stabilization feedback circuit (1): see Fig. 4 or Fig. 3, take VMOS pipe T as main devices, by T, sampling resistor Rf, protective resistance R9, R10, formed.Its annexation is: one end of R9 is as the input end Tin of this circuit (1), the other end is connected with the grid G of R10, T, the drain D of T is as the power positive end Td of this circuit (1), the source S of T is connected with resistance R _ f, R10 as the feedback end Rf+ of this circuit (1), and the other end of resistance R _ f is as the power supply negative terminal Rf-of this circuit (1).
Power is adjusted choosing of pipe: in this circuit (1), T is high-power V metal-oxide-semiconductor, selects as required pipe.During for moment maximum operating voltage≤750V(load short circuits) environment, can adopt 8N90C(absolute rating: I
d=6A, V
dSS=900V, P
d=170W) or similar pipe.During for moment maximum operating voltage≤150V(load short circuits) environment, can adopt IRFP250N(absolute rating: I
d=30A, V
dSS=200V, P
d=210W) or similar pipe.Above-mentioned VMOS pipe must be arranged on surface area enough on large black coating aluminium radiator fin, and adopts forced air cooling heat radiation.
Operating voltage on reduction VMOS pipe can significantly reduce the power consumption of this device, improves reliability.While therefore normally working, should turn down the input voltage at device two ends as far as possible.
If adjust pipe T, adopt parallel-connection structure, can improve the current stabilization power of device.
Rf is current sampling resistor, is accurate wire-wound resistor, and its resistance and power are determined by maximum current stabilization value Imax.Rf selects: steady current Imax during first determining device maximum functional, and Rf should meet following formula:
Rf≤5/Imax （1）
Formula (1) has determined the higher limit of Rf, when on resistance, power consumption is large, it need be arranged on heat radiator.
This power amplification and current stabilization feedback circuit (1) have 4 port: Tin, Rf+, Td and Rf-.
Described accurate power module of voltage regulation (2): seeing Fig. 5 or Fig. 3, is by current-limiting resistance R1, accurate integrated regulator D2, D3 (TL431) and outer meeting resistance R2, R3, R4, R5, filter capacitor C1, C2, C3 composition.D2, D3 are cascaded structure, and 5V (Wo2 output) and 10.5V (Wo1 output) voltage of voltage regulation are provided.
Between it, annexation is: one end of resistance R 1 is as the input end Win of this module (2); The negative electrode of D2 and the other end of R1, divider resistance R2 and capacitor C 1, C3 is anodal is connected, and as the 10.5V output terminal Wo1 of this module (2); The adjustment end of D2 is connected with the other end and the R3 of R2; The anode of D2 and the other end of R3, C1 and the negative electrode of D3, R4, C2 are connected, and as the 5V output terminal Wo2 of this module (2); The adjustment end of D3 is connected with the other end and the R5 of R4; The anode of D3 is connected with the other end of R5, C2 and the negative pole of C3, and as the common port W-of this module (2).
The working current of TL431 is 1～100mA, and output voltage Wo1, the Wo2 of power module of voltage regulation (2) are determined by following formula:
Wo2=(1+R4/R5)×2.5 （2）
Wo1=Wo2+(1+R2/R3)×2.5 （3）
This example is designed to Wo2=5V, Wo1=10.5V.
The resistance of mu balanced circuit current-limiting resistance R1 is determined by the maximum continuous working voltage bearing on power adjustment pipe T.When voltage is high, the value of R1 is large, otherwise that R1 can obtain is smaller.
For example: when R1 gets 10k, according to the characteristic of TL431, moment maximum input voltage can allow 0.1A × 10000 Ω=1000V.In fact continuously maximum working voltage is by the power consumption P=V in resistance R 1
2/ R decision, if R1 gets 16W (the cement resistor parallel connections of available two 10W), this module (2) continuous working input voltage can notice that the power consumption of now adjusting on pipe T does not exceed restriction to 400V().Visible, this circuit has wider operating voltage range.Capacitor C 3 strobes.
This precision power module of voltage regulation (2) has 4 ports: input end Win, output terminal Wo1, Wo2, common port W-.
Described numerical control current stabilization adjustment module (3): see Fig. 6 or Fig. 3, by digital regulation resistance U2X9C103 and resistance R 11, R12, touch-switch S1, S2 composition.
Digital regulation resistance U2X9C103 has 99 resistance in being, the solid-state potentiometer of 10k Ω Low-Power CMOS of 100 tapping points, and 3 line serial interfaces, have power-failure memory, a restore funcitons that powers on, 5V operating voltage.Pin is arranged as in order, 1 pin/INC: delta pulse input, 2 pin U/D: increase/subtract direction control, 3 pin VH: digital regulation resistance hot end, 4 pin Vss: power-, 5 pin Vw: digital regulation resistance tap, 6 pin VL: digital regulation resistance cold end, 7 pin/CS: sheet choosing end, 8 pin Vcc: power supply just.In this module (3), touch-switch S1 is increment button, and S2 is increase and decrease arrow button.Press touch-switch S1 and S2, can change Pw and hold V-terminal voltage U
pW.Often press S1 one time, electric current increases a step, until maximal value.If when pressing S2 and do not put, press S1 button, electric current reduces.
Between this module (3), annexation is: the 8 pin Vcc of digital regulation resistance U2X9C103 meet Wo2 (5V) end of R11 and accurate power module of voltage regulation (2), another termination 3 pin VH of R11; 6 pin VL meet R12, another termination 4 pin Vss of R12; 7 pin/CS meets 4 pin Vss, and 2 pin U/D and 1 pin/INC connect respectively and touch key S2 and S1, and draws as microcomputer control port UD and INC; Touch another termination 4 pin Vss of key S1 and S2,4 pin Vss extension lines are as the P-end of this module (3); 8 pin Vcc extension lines are held as P+; 5 pin Vw extension lines are held as Pw.
This numerical control current stabilization adjustment module (3) has five port: P+, P-and Pw and microcomputer control port INC and UD.
Described current stabilization control and amplification driver module (4): see Fig. 7 or Fig. 3, by low-power consumption single supply op U1 (LM358), anode input resistance R6, negative terminal input resistance R7 and negative feedback resistor R8 composition standard straight stream amplifier, realize comparison and amplification to current stabilization control signal.
Annexation between it is: the positive input terminal (pin 3) of this U1 is connected with this R6, and the other end of this R6 is as the input end IN+ of this module (4); The negative input end (pin 2) of this U1 is connected with this R7, R8, and the other end of this R7 is as the input end IN-of this module (4); This U1 output terminal (pin 1) is connected with the other end of this R8, as the output terminals A o of this module (4); The pin 8 of this U1 is power positive end A+ of this module (4), and the pin 4 of this U1 is common port A-of this module (4).
This current stabilization control and amplification driver module (4) have 5 port: IN+, IN-, Ao, A+ and A-.
The demonstration of steady current: adopt 3 half LED digital voltage gauge outfits, difference working method, gets after Rf both end voltage measured value converts and read, and the real-time LED numeral that realizes current stabilization value shows.
Advantage and effect: the advantage that the present invention relates to a kind of two end tandem type self-powered numerical control high power DC adjustable constant current devices is: device can be realized the high-power current stabilization power supply of a few hectovolt voltages, and current stability is better; There are larger operating voltage range and load variations scope; Numerical control regulates, and leaves microcomputer control interface (Transistor-Transistor Logic level), is convenient to realize intelligent and program control.There is over-voltage protecting function, prevent that instantaneous pressure from causing that power tube T punctures.
Accompanying drawing explanation:
Fig. 1 is two end tandem type self-powered numerical control high power DC adjustable constant current apparatus structure block diagrams
Fig. 2 is basic tandem type current stabilization circuit schematic diagram
Fig. 3 is two end tandem type self-powered numerical control high power DC adjustable constant current device circuit figure
Fig. 4 is power amplification and current stabilization feedback circuit figure
Fig. 5 is accurate power module of voltage regulation circuit diagram
Fig. 6 is numerical control current stabilization adjustment module circuit diagram
Fig. 7 is current stabilization control and amplifies driver module circuit diagram
In figure, symbol description is as follows:
The basic tandem type current stabilization circuit of Fig. 2:
R1, R2: divider resistance; W: WW POT; D: voltage stabilizing diode; R3: current-limiting resistance.T: high-power V metal-oxide-semiconductor; Rf: accurate power wire-wound resistor.Port v+: be connected with power supply "+" end, port V-: be connected with load.Fig. 3 bis-end tandem type self-powered numerical control high power DC adjustable constant current device circuit figure:
In way circuit, D1: reverse connecting protection diode; RV: voltage dependent resistor (VDR); Port v+, port V-.
Power amplification and current stabilization feedback circuit (1): T:VMOS power tube; Rf: sampling resistor---be accurate power wire-wound resistor; R9, R10: protective resistance---be conventional, electric-resistance.Tin, Rf+, Td, Rf-: circuit lead define symbol.
Accurate power module of voltage regulation (2): R1: current-limiting resistance is high-power cement resistor; R2, R3, R4, R5: be metalfilmresistor; D2, D3: accurate integrated regulator TL431; C1, C2: filter capacitor, C3: electrochemical capacitor.Win, Wo1, Wo2, W-: circuit lead define symbol.
Numerical control current stabilization adjustment module (3): U2(X9C103): digital regulation resistance; R11, R12: be metalfilmresistor; S1, S2: touch key.P+, P-, Pw: circuit lead define symbol, INC, UD: standby control port.
Current stabilization control and amplification driver module (4): U1: single supply op LM358; R6, R7, R8: be metalfilmresistor.IN+, IN-, A0, A+ and A-: circuit lead define symbol.
Fig. 4 power amplification and current stabilization feedback circuit:
T:VMOS power tube, Rf: be accurate power wire-wound resistor, its resistance and power are determined by the maximum current stabilization value of power supply.
R9, R10 conventional, electric-resistance; .Tin, Rf+, Td, Rf-: circuit is drawn port.
The accurate power module of voltage regulation of Fig. 5:
R1: current-limiting resistance is high-power cement resistor; R2, R3, R4, R5: be metalfilmresistor; D2, D3: accurate integrated regulator TL431; C1, C2: filter capacitor, C3: electrochemical capacitor.Win, Wo1, Wo2, W-: circuit is drawn port.
Fig. 6 numerical control current stabilization adjustment module:
U2(X9C103): digital regulation resistance; R11, R12: be metalfilmresistor; S1, S2: touch key.P+, P-, Pw: circuit is drawn port, INC, UD: standby control port.
The control of Fig. 7 current stabilization and amplification driver module:
U1: single supply op LM358; R6, R7, R8 are metalfilmresistor.IN+, IN-, A0, A+ and A-: circuit is drawn port.
Embodiment:
The present invention is a kind of two end tandem type self-powered numerical control high power DC adjustable constant current devices, and structured flowchart is as Fig. 1.Concrete implementing circuit as shown in Figure 3, it comprises 4 modules: power amplification and current stabilization feedback circuit (1), accurate power module of voltage regulation (2), numerical control current stabilization adjustment module (3), current stabilization control and amplification driver module (4).
In circuit lead define symbol or Fig. 4～7, circuit is drawn port symbol in 3 with reference to the accompanying drawings, and the position annexation between them is:
1. while working, in this stabilized current supply device series connection access load circuit, circuit has reverse connecting protection and overvoltage protection.Reverse connecting protection is realized by commutation diode D1, and D1 anode is connected with port V+, and negative terminal is connected with the Td end of circuit (1); Overvoltage protection is realized by voltage dependent resistor (VDR) RV, and RV is in parallel with port V+, V-.V+ is connected with power supply "+" end, and V-end is connected with load, and the other end of load is connected with power supply "-" end.
Commutation diode D1 can select 1N4007 (during working current≤1A), or 1N5408 (during working current≤3A) etc.Voltage dependent resistor (VDR) RV can select MYG type, and its nominal voltage should be lower than the voltage breakdown V of power tube T
dSS, desirable 0.7V
dSS.
2. the Td of power amplification and current stabilization feedback circuit (1) end is connected with protection diode D-end; input end Tin is connected with the output terminals A o that amplifies driver module (4) with current stabilization control; Rf+ end is connected with the In-end that amplifies driver module (4) with current stabilization control, and Rf-end is connected with this constant-current stabilizer V-end.
3. the end of the input Win in accurate power module of voltage regulation (2) is connected with protection diode negative terminal D-; common port W-is connected with the V-input end of this constant-current stabilizer; output Wo1 end is connected with the A+ end that amplifies driver module (4) with current stabilization control, and output Wo2 end is connected with the P+ end of numerical control current stabilization adjustment module (3).
4. the P+ of numerical control current stabilization adjustment module (3) end is connected with the Wo2 end of accurate power module of voltage regulation (2), and P-end is connected with the A-end that amplifies driver module (4) with current stabilization control.Pw end is connected with the IN+ end that amplifies driver module (4) with current stabilization control.
5. current stabilization control is connected with the Pw end in numerical control current stabilization adjustment module (3) with the positive input terminal IN+ of amplification driver module (4), and negative input end IN-is connected with the Rf+ of current stabilization feedback circuit (1) with power amplification; The input Tin end of Ao termination circuit (1), the Wo1 end of the accurate power module of voltage regulation of A+ termination (2), A-end is connected with this constant-current stabilizer V-end.
Described power amplification and current stabilization feedback circuit (1): see Fig. 4 or Fig. 3, take VMOS pipe T as main devices, by T, sampling resistor Rf, protective resistance R9, R10, formed.Its annexation is: one end of R9 is as the input end Tin of this circuit (1), the other end is connected with the grid G of R10, T, the drain D of T is as the power positive end Td of this circuit (1), the source S of T is connected with resistance R _ f, R10 as the feedback end Rf+ of this circuit (1), and the other end of resistance R _ f is as the power supply negative terminal Rf-of this circuit (1).
Power adjustment pipe T is high-power V metal-oxide-semiconductor, according to maximum operating voltage and working current, selects.Pipe must be arranged on surface area enough on large black coating aluminium radiator fin, and adopts forced air cooling heat radiation.
Operating voltage on reduction VMOS pipe can significantly reduce the power consumption of this device.During normal work, should turn down the input voltage at device two ends as far as possible.
If adjust pipe T, adopt parallel-connection structure, can improve the current stabilization power of device.
Rf is current sampling resistor, is accurate wire-wound resistor, and its resistance and power are determined by maximum current stabilization value Imax.In work, the upper power consumption of Rf is larger, it need be arranged on heat radiator.
Rf selects: by device maximum stable electric current I max, Rf should satisfy condition:
Rf≤5/Imax
Power amplification and current stabilization feedback circuit (1) have 4 port: Tin, Rf+, Td and Rf-.
Described accurate power module of voltage regulation (2): seeing Fig. 5 or Fig. 3, is by current-limiting resistance R1, accurate integrated regulator D2, D3 (TL431) and outer meeting resistance R2, R3, R4, R5, filter capacitor C1, C2, C3 composition.D2, D3 are cascaded structure, and 5V (Wo2 output) and 10.5V (Wo1 output) voltage of voltage regulation are provided.
Between it, annexation is: one end of resistance R 1 is as the input end Win of this module (2); The negative electrode of D2 and the other end of R1, divider resistance R2 and capacitor C 1, C3 is anodal is connected, and as the 10.5V output terminal Wo1 of this module (2); The adjustment end of D2 is connected with the other end and the R3 of R2; The anode of D2 and the other end of R3, C1 and the negative electrode of D3, R4, C2 are connected, and as the 5V output terminal Wo2 of this module (2); The adjustment end of D3 is connected with the other end and the R5 of R4; The anode of D3 is connected with the other end of R5, C2 and the negative pole of C3, and as the common port W-of this module (2).
The resistance of mu balanced circuit current-limiting resistance R1 is determined by the maximum continuous working voltage bearing on power adjustment pipe T.When voltage is high, the value of R1 is large, otherwise that R1 can obtain is smaller.
This precision power module of voltage regulation (2) has 4 ports: input end Win, output terminal Wo1, Wo2, common port W-.
Described numerical control current stabilization adjustment module (3): see Fig. 6 or Fig. 3, by digital regulation resistance U2(X9C103), 7 10k or similar chip) and resistance R 11, resistance R 12, touch-switch S1, S2 composition.
Digital regulation resistance X9C103 operating voltage 5V.Pin is arranged as in order, 1 pin/INC: delta pulse, 2 pin U/D: increase/subtract direction control, 3 pin VH: digital regulation resistance hot end, 4 pin Vss: power-, 5 pin Vw: digital regulation resistance tap, 6 pin VL: digital regulation resistance cold end, 7 pin/CS: sheet choosing end, 8 pin Vcc: power supply just.
In this module (3), touch-switch S1 is increment button, and S2 is increase and decrease arrow button.Press touch-switch S1 and S2, can change Pw and hold V-terminal voltage U
pW.
Between this module (3), annexation is: the 8 pin Vcc of digital regulation resistance X9C103 meet Wo2 (5V) end of R11 and accurate power module of voltage regulation (2), another termination 3 pin VH of R11; 6 pin VL meet R12, another termination 4 pin Vss of R12; 7 pin/CS meets 4 pin Vss, and 2 pin U/D and 1 pin/INC connect respectively and touch key S2 and S1, and draws as microcomputer control port UD and INC; Touch another termination 4 pin Vss of key S1 and S2,4 pin Vss extension lines are as the P-end of this module (3); 8 pin Vcc extension lines are held as P+; 5 pin Vw extension lines are held as Pw.
This numerical control current stabilization adjustment module (3) has five port: P+, P-and Pw and microcomputer control port INC and UD.
Described current stabilization control and amplification driver module (4): see Fig. 7 or Fig. 3, by low-power consumption single supply op U1 (LM358), anode input resistance R6, negative terminal input resistance R7 and negative feedback resistor R8 composition standard straight stream amplifier, compare and amplify current stabilization control signal.
Annexation between it is: the positive input terminal (pin 3) of this U1 is connected with this R6, and the other end of this R6 is as the input end IN+ of this module (4); The negative input end (pin 2) of this U1 is connected with this R7, R8, and the other end of this R7 is as the input end IN-of this module (4); This U1 output terminal (pin 1) is connected with the other end of this R8, as the output terminals A o of this module (4); The pin 8 of this U1 is power positive end A+ of this module (4), and the pin 4 of this U1 is common port A-of this module (4).
This current stabilization control and amplification driver module (4) have 5 port: IN+, IN-, Ao, A+ and A-.
The demonstration of steady current: adopt 3 half LED digital voltage gauge outfits, difference working method, gets after Rf both end voltage measured value converts and read, and the real-time LED numeral that realizes current stabilization value shows.
Fig. 3 practical circuit is applicable to maximum stable electric current in 1 ampere to parameter, and instantaneous maximum operating voltage is less than under the working environment of 750 volts.During this constant-current stabilizer long-term stable operation, port voltage value should be adjusted to 100～150V, to reduce heating and the power consumption of this constant-current stabilizer.The resistance that reduces R1 can make constant-current stabilizer operating voltage interval move down.
Fig. 2 is basic tandem type current stabilization circuit figure.
Claims (1)
1. an end tandem type self-powered numerical control high power DC adjustable constant current device, it is characterized in that: it comprises 4 application circuit modules: power amplification and current stabilization feedback circuit (1), accurate power module of voltage regulation (2), numerical control current stabilization adjustment module (3) and current stabilization control and amplification driver module (4), their annexations are as follows:
1) while working, in this constant-current stabilizer series connection access load circuit, diode D1 anode D+ is connected with device port V+, and negative terminal D-is connected with the Td end of power amplification and current stabilization feedback circuit (1); Voltage dependent resistor (VDR) RV is connected in parallel on device port V+, V-two ends, and V+ is connected with power supply "+" end, and V-end is connected with load, and the other end of load is connected with power supply "-" end;
2) Td of power amplification and current stabilization feedback circuit (1) end is connected with diode D-end, input end Tin is connected with the output terminals A o that amplifies driver module (4) with current stabilization control, Rf+ end is connected with the IN-end that amplifies driver module (4) with current stabilization control, and Rf-end is connected with this constant-current stabilizer V-end;
3) end of the input Win in accurate power module of voltage regulation (2) is connected with diode D-end, common port W-is connected with the V-input end of this constant-current stabilizer, output Wo1 end is connected with the A+ end that amplifies driver module (4) with current stabilization control, and output Wo2 end is connected with the P+ end of numerical control current stabilization adjustment module (3);
4) P+ of numerical control current stabilization adjustment module (3) end is connected with the Wo2 end of accurate power module of voltage regulation (2), P-end is connected with the A-end that amplifies driver module (4) with current stabilization control, and Pw end is connected with the IN+ end that amplifies driver module (4) with current stabilization control;
5) current stabilization control is connected with the Pw end in numerical control current stabilization adjustment module (3) with the positive input terminal IN+ of amplification driver module (4), and negative input end IN-is connected with the Rf+ of current stabilization feedback circuit (1) with power amplification; The input Tin end of Ao termination circuit (1), the Wo1 end of the accurate power module of voltage regulation of A+ termination (2), A-end is connected with this constant-current stabilizer V-end;
During application, V+ is connected with power supply "+" end, and V-is connected with load, and the other end of load is held and is connected with "-" of power supply, and itself does not need independent power supply this constant-current stabilizer;
Described power amplification and current stabilization feedback circuit (1): take VMOS pipe T as main devices, by T, sampling resistor Rf, protective resistance R9, R10, formed, one end of R9 is as the input end Tin of this circuit (1), the other end is connected with the grid G of R10, T, the drain D of T is as the power positive end Td of this circuit (1), the source S of T is connected with resistance R _ f, R10 as the feedback end Rf+ of this circuit (1), and the other end of resistance R _ f is as the power supply negative terminal Rf-of this circuit (1); This power amplification and current stabilization feedback circuit (1) have 4 port: Tin, Rf+, Td and Rf-;
Described accurate power module of voltage regulation (2): be by current-limiting resistance R1, accurate integrated regulator D2, D3 are TL431 and outer meeting resistance R2, R3, R4, R5, filter capacitor C1, C2, C3 composition, D2, D3 are cascaded structure, and the voltage of voltage regulation of 5V and 10.5V is provided; One end of resistance R 1 is as the input end Win of this module (2); The negative electrode of D2 and the other end of R1, divider resistance R2 and capacitor C 1, C3 is anodal is connected, and as the 10.5V output terminal Wo1 of this module (2); The adjustment end of D2 is connected with the other end and the R3 of R2; The anode of D2 and the other end of R3, C1 and the negative electrode of D3, R4, C2 are connected, and as the 5V output terminal Wo2 of this module (2); The adjustment end of D3 is connected with the other end and the R5 of R4; The anode of D3 is connected with the other end of R5, C2 and the negative pole of C3, and as the common port W-of this module (2); This precision power module of voltage regulation (2) has 4 ports: input end Win, output terminal Wo1, Wo2, common port W-;
Described numerical control current stabilization adjustment module (3): by digital regulation resistance U2 X9C103 model and resistance R 11, R12, touch key S1, S2 composition, 8 pin Vcc of digital regulation resistance U2 X9C103 model meet the Wo2 end of R11 and accurate power module of voltage regulation (2), another termination 3 pin VH of R11; 6 pin VL meet R12, another termination 4 pin Vss of R12; 7 pin/CS meets 4 pin Vss, and 2 pin U/D and 1 pin/INC connect respectively and touch key S2 and S1, and draws as microcomputer control port UD and INC; Touch another termination 4 pin Vss of key S1 and S2,4 pin Vss extension lines are as the P-end of this module (3); 8 pin Vcc extension lines are held as P+; 5 pin Vw extension lines are held as Pw; This numerical control current stabilization adjustment module (3) has five port: P+, P-and Pw and microcomputer control port INC and UD;
Described current stabilization control and amplification driver module (4): by low-power consumption single supply op, U1 is LM358, anode input resistance R6, negative terminal input resistance R7 and negative feedback resistor R8 composition standard straight stream amplifier, realize comparison and amplification to current stabilization control signal; The positive input terminal pin 3 of this U1 is connected with anode input resistance R6, and the other end of this R6 is as the input end IN+ of this module (4); The negative input end pin 2 of this U1 is connected with negative terminal input resistance R7, negative feedback resistor R8, and the other end of this R7 is as the input end IN-of this module (4); This U1 output terminal pin 1 is connected with the other end of this R8, as the output terminals A o of this module (4); The pin 8 of this U1 is power positive end A+ of this module (4), and the pin 4 of this U1 is common port A-of this module (4), and this current stabilization control and amplification driver module (4) have 5 port: IN+, IN-, Ao, A+ and A-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210411587.6A CN102880214B (en) | 2012-10-24 | 2012-10-24 | Two-end-serial self-powered digitally-controlled high-power direct-current adjustable current stabilizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210411587.6A CN102880214B (en) | 2012-10-24 | 2012-10-24 | Two-end-serial self-powered digitally-controlled high-power direct-current adjustable current stabilizer |
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| CN102880214A CN102880214A (en) | 2013-01-16 |
| CN102880214B true CN102880214B (en) | 2014-04-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87216804U (en) * | 1987-12-22 | 1988-12-28 | 地方国营邗江无线电厂 | High voltage and large power continuously adjustable power supplying device capable of supplying constant voltage or constant current |
| CN101226342A (en) * | 2008-01-29 | 2008-07-23 | 芯硕半导体（中国）有限公司 | Programmed control slow-starting high stabilization great current drive device |
| JP5736772B2 (en) * | 2010-12-27 | 2015-06-17 | サンケン電気株式会社 | Constant current power supply |
| CN202818102U (en) * | 2012-10-24 | 2013-03-20 | 首都师范大学 | Two-end-serial self-powered numerically-controlled high-power direct-current adjustable current stabilizer |
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