CN103296903B - Direct current silicon commutating power supply - Google Patents
Direct current silicon commutating power supply Download PDFInfo
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- CN103296903B CN103296903B CN201310207027.3A CN201310207027A CN103296903B CN 103296903 B CN103296903 B CN 103296903B CN 201310207027 A CN201310207027 A CN 201310207027A CN 103296903 B CN103296903 B CN 103296903B
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Abstract
The invention discloses a kind of DC power supply circuit; comprise major loop, control loop and Control protection loop; being connected by air switch of described major loop is cut off the electricity supply; contactor is adopted to control main circuit; pass through instrument transformer; form three-phase thyristor bridge rectification AC voltage adjusting circuit by thyristor, be input to transformer primary side, secondary side is through the uncontrollable rectification circuit of diode composition three-phase bridge.Control circuit adopts relay to control, and is made up of, realizes rectify control and fault actions, faulty indication relay, the time relay, control button and indicator light; Adopt power electronic technology, build protective loop and circuits for triggering, protective loop has voltage stabilizing, current stabilization, dams, soft start function, and be provided with open-phase protection, overcurrent protection, overvoltage protection, short-circuit protection function.The control signal that realizes digital flip flop synchronously detects, phase shift, pulse shaping, pulse deinterleaving and enlarging function.This invention improves the reliability of device.
Description
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of DC power supply generating means, particularly a kind of direct current silicon commutating power supply.
Background technology
DC power supply is widely used in industrial or agricultural and civilian installation.Particularly plating, electrolysis industry.Three-phase controlled rectifier circuit utilizes electric electronic current change technology, and three phase sine alternating current is become unidirectional direct current adjustable stably by rectifier cell.The rectifier bridge that rectifying device mainly adopts thyristor to build, thyristor has single-phase conduction, and after thyristor adds positive anode voltage, gate pole adds suitable forward gate voltage, makes turn on thyristors process be called triggering.Thyristor is once after triggering and conducting, and gate pole, just to its effect out of hand, as long as usually add a direct impulse voltage on gate pole, is called trigger voltage.
Utilize this characteristic of thyristor, by thyristor by certain composition of relations, make alternating current single-phase by thyristor circuit, thus realize rectification.In rectification circuit, the most important thing is, send pulse signal, make turn on thyristors in the suitable moment to main circuit thyristor, therefore, circuits for triggering are keys of rectification success or failure.At present, circuits for triggering mainly contain simulation triggering and digital triggering two kinds.Concerning analog thyristor trigger, conventional can be divided into again sine-wave synchronous and synchronous two extended familys of sawtooth waveforms.Adopt the trigger of sine-wave synchronous, due to synchronizing signal amplitude and sinusoidal wave waveform requirements comparatively tight, nowadays less application, and the synchronous analog trigger of sawtooth waveforms obtains and applies very widely in current thyristor power electronic equipment.But this trigger is owing to obtaining sawtooth waveforms by constant-current source to capacitor charging, often electric capacity and constant-current source output current are just set as definite value in trigger manufacturing process, when synchronizing voltage frequency reduces, then sawtooth waveforms width increases, charging interval is elongated, sawtooth waveforms amplitude is caused to increase, it is contrary to synchronizing voltage frequency raises, sawtooth waveforms narrowed width, charging interval shortens, sawtooth waveforms amplitude is caused to reduce, therefore, when phase shift controlling voltage one timing, due to synchronizing voltage frequency change, cause the pilot angle exporting trigger impulse not identical, just be difficult to reach the stable requirement exported, naturally the change adapting to synchronizing voltage frequency is difficult to
On the other hand, existing three phase controlled rectifier circuit at a time needs to trigger 2 thyristors simultaneously and falls logical.If pulse duration is too small, easily causes and trigger unsuccessfully.Employing broad pulse triggers, and pulse duration is greater than 60 degree, adopts broad pulse to trigger this circuits for triggering pulse front edge steepness poor, and device power consumption is large, needs the shortcomings such as the pulse transformer of large volume.
Summary of the invention
For the defect existed in above-mentioned prior art or deficiency, the object of the invention is to, a kind of direct current silicon commutating power supply is provided, main circuit employing three-phase thyristor bridge rectification circuit and not controlled bridge-type rectification circuit, control loop is built, the logic control of realizing circuit with relay, the time relay; Adopt power electronic technology, utilizing power amplifier, semiconductor element and electronic chip to build protective loop and thyristor trigger, is a kind of high-current dc power supply device.
To achieve these goals, the present invention adopts following technical solution:
A kind of direct current silicon commutating power supply, comprises major loop, Relay-controlled Circuit, protective circuit and circuits for triggering; Wherein, described Relay-controlled Circuit, protective circuit are connected major loop respectively with circuits for triggering, and Relay-controlled Circuit connects protective circuit, and protective circuit is connected with circuits for triggering.
Further, described major loop comprises three-phase alternating-current supply, contactor, D.C mutual-inductor, Thyristor A. C. voltage regulator, three-phase transformer and three-phase bridge rectifier circuit; Wherein, described three-phase alternating-current supply connects three D.C mutual-inductors by contactor, D.C mutual-inductor lower end connects Thyristor A. C. voltage regulator respectively, and the lower end of Thyristor A. C. voltage regulator connects described three-phase transformer jointly, and three-phase transformer connects described three-phase bridge rectifier circuit.
Further, the power supply of described major loop is three-phase alternating-current supply, and A phase, the B phase of three-phase alternating-current supply install three-phase air switch S with C phase
o, three-phase air switch S
olower end A1, B1 and C1 all with contactor K
0main contacts be connected; Contactor K
0main contacts lower end A2, B2 be connected D.C mutual-inductor T respectively with C2
4, T
5and T
6; D.C mutual-inductor T
4secondary side connecting resistance R4, in case D.C mutual-inductor secondary circuit short-circuit; D.C mutual-inductor T
5secondary side connecting resistance R5, D.C mutual-inductor T
6secondary side connecting resistance R6; D.C mutual-inductor T
4, T
5and T
6lower end be respectively A3, B3 and C3, A3, B3 and C3 lower end is connected to a Thyristor A. C. voltage regulator respectively, and concrete connection is as follows: from A3 three circuit in parallel, Article 1 circuit connects the anode of thyristor V1 from A3, the negative electrode of thyristor V1 meets A4, and gate pole g1 contacts the X11 of Power Generation Road; Article 2 circuit is resistance-capacitance circuit, and Article 2 circuit meets electric capacity C1 from A3, electric capacity C1 other end connecting resistance R1, another termination A4 of resistance R1, and this resistance-capacitance circuit is used for suppressing internal cause overvoltage, comprises phase conversion overvoltage and turns off overvoltage; Article 3 circuit connects the negative electrode of thyristor V4 from A3, and the anode of thyristor V4 meets A4, and gate pole g4 contacts the X41 of Power Generation Road.In like manner, from B3 three circuit in parallel, Article 1 circuit connects the anode of thyristor V3 from B3, and the negative electrode of thyristor V3 meets B4, and gate pole g3 contacts the X31 of Power Generation Road; Article 2 circuit meets electric capacity C2 from B3, electric capacity C2 other end connecting resistance R2, another termination B4 of resistance R2; Article 3 circuit connects the negative electrode of thyristor V6 from B3, and the anode of thyristor V6 meets B4, and gate pole g6 contacts the X61 of Power Generation Road; From C3 three circuit in parallel, Article 1 circuit connects the anode of thyristor V5 from C3, and the negative electrode of thyristor V5 meets C4, and gate pole g5 contacts the X51 of Power Generation Road; Article 2 circuit meets electric capacity C3 from C3, electric capacity C3 other end connecting resistance R3, another termination C4 of resistance R3; Article 3 circuit connects the negative electrode of thyristor V2 from C3, and the anode of thyristor V2 meets C4, and gate pole g2 contacts the X21 of Power Generation Road; The gate pole of above-mentioned 6 thyristor V1-V6 presses V1-V6 sequential turn-on, the adjacent two turn on thyristors phase angle difference 60 degree in front and back;
Lower end A4, B4, C4 of three Thyristor A. C. voltage regulators are all connected with three-phase transformer T1, and three-phase transformer T1 primary side adopts delta connection from beginning to end, and three-phase transformer T1 secondary side A5, B5, C5 also adopt delta connection from beginning to end;
Three-phase transformer T1 exports termination three-phase bridge rectifier circuit.This three-phase bridge rectifier circuit has six brachium pontis, from A5 parallel diode V11 and V14, from B5 parallel diode V13 and V16, from C5 parallel diode V15 and V12, the wherein output common anode pole of diode V11, V13, V15, the output common cathode of diode V14, V16, V12.
Three branch roads in parallel between 100 with 101 o'clock, wherein, Article 1 branch road meets slide rheostat RP1 from 100, this slide rheostat RP1 is in order to overcurrent value of adjusting, 1.1 times that adjust in rated current, lower termination 101 point of the lower terminating resistor R7 of rheostat RP1, resistance R7; Article 2 branch road is from lower termination 103 point of 100 connecting resistance R8, resistance R8; Article 3 branch road meets voltmeter PV from 100, another termination 101 point of voltmeter PV.
Further, the structure of described Relay-controlled Circuit is as follows:
6 branch roads below the secondary side parallel connection of control transformer T3:
Article 1, branch road meets contactor K from 270
0auxiliary normally-closed contact upper end, contactor K
0auxiliary normally-closed contact under lower termination 239 point of termination red led HR1, red led HR1, this branch road realizes shutting down instruction;
Article 2 branch road meets contactor K from 270
0auxiliary normally opened contact upper end, contactor K
0auxiliary normally opened contact under lower termination 239 point of termination green indicating lamp HG1, green indicating lamp HG1, this branch road realizes running instruction;
Article 3 branch road meets making button S from 270
2, realize the startup of control device, making button S
2carry out parallel connection as required, realize execute-in-place and remote operation various modes.Making button S
2one, lower end guide 113 points into, as making button S
2to operation instruction power supply during action, making button S
2another branch road of lower end meet dynamic circuit breaker button S
1, realize the stopping of control device, dynamic circuit breaker button S
1connect as required, realize execute-in-place and remote operation various modes.Connect in the present embodiment two dynamic circuit breaker button S
1, each dynamic circuit breaker button S
1lower relay termination K
2the upper end of auxiliary normally-closed contact, relay K
2the lower termination time relay κ of auxiliary normally-closed contact
1coil, time relay κ
1lower termination 239 point of coil; Time relay K
1auxiliary normally-closed contact access and 274 points of protective circuit respectively at 273, this branch road realizes power supply on/off switch;
Article 4 branch road connects the auxiliary normally opened contact of the relay K of protective circuit from 270, the lower relay termination K of the auxiliary normally opened contact of relay K
2coil, relay K
2lower termination 239 point of coil, relay K
2auxiliary normally opened contact access and 274 points respectively at 273, this branch road realizes fault actions;
Article 5 branch road is from the upper end of 270 water receiving pressure sensor KL, the normally closed point in lower end of water pressure sensor KL connects 271 points, the lower end normal opened contact of water pressure sensor KL connects the upper end of yellow indicator lamp HY, and lower termination 239 point of yellow indicator lamp HY, as the instruction of thyristor water pressure of cooling water;
Article 6 branch road is from 270 contact relay K
2auxiliary normally opened contact, relay K
2auxiliary normally opened contact under lower termination 239 point of termination red led HR2, red led HR2, this branch road realizes faulty indication;
Control circuit is from 268 and 269 access making button S of protective circuit
3, this branch road realizes failure reset;
From major loop A1 point relay K turn-on time
1time delay open the instantaneous normally opened contact closed, time relay K
1time delay open instantaneous 308, the lower end of often opening closed, contact and meet contactor K
0coil, contactor K
0the lower termination main circuit B1 point of coil.
Further, the power supply of described Relay-controlled Circuit leads to the primary side of control transformer T3 since B1 and C1 of major loop; The secondary side of control transformer T3 exports the voltage of three kinds of grades, is respectively and exchanges 24V, exchanges 6.3V and exchanges 5V.
Compared with prior art, tool of the present invention has the following advantages:
1) adopt chip and element jointly to build circuit, compact conformation, reduce equipment volume, be easy to change.Do not have complicated mechanical structure, work friction, noise is little;
2) multiple safeguard measure is adopted, the fault such as available protecting phase shortage, overcurrent, overvoltage, short circuit;
3) technology maturation, reliability is high, has quite high conversion efficiency.In frequent especially start and stopping process, efficiency is lossless, can energy savings;
4) DC adjustment scope is large.User can adjust flexibly according to loading condition.
5) start conveniently, adopt soft starting mode, impact little to electrical network.
6) can carry out manual and automatic two kinds of operations, mode is flexible.
Accompanying drawing explanation
Fig. 1 is system schematic of the present invention.
Fig. 2 is the schematic diagram of major loop of the present invention.
Fig. 3 is the schematic diagram of Relay-controlled Circuit of the present invention.
Fig. 4 is protective circuit schematic diagram.
Fig. 5 is circuits for triggering schematic diagrams.
Fig. 6 is the oscillogram of each sampled point of circuits for triggering.
Below in conjunction with the drawings and specific embodiments, further explanation is explained to the present invention.
Embodiment
Direct current silicon commutating power supply of the present invention, comprises major loop, Relay-controlled Circuit, protective circuit and circuits for triggering; Wherein, described Relay-controlled Circuit, protective circuit are connected major loop respectively with circuits for triggering, and Relay-controlled Circuit connects protective circuit, and protective circuit is connected with circuits for triggering.Relay-controlled Circuit, protective circuit and circuits for triggering are used for controlling major loop, make major loop export user's required voltage and electric current, realize the protection of major loop simultaneously.
Major loop:
As shown in Figure 1 and Figure 2, the power supply of described major loop is three-phase alternating-current supply, and A phase, the B phase of three-phase alternating-current supply install three-phase air switch S with C phase
o, three-phase air switch S
olower end A1, B1 and C1 all with contactor K
0main contacts be connected, with to main circuit power supply; Contactor K
0main contacts lower end A2, B2 be connected D.C mutual-inductor T respectively with C2
4, T
5and T
6; D.C mutual-inductor T
4secondary side connecting resistance R4, in case D.C mutual-inductor secondary circuit short-circuit; D.C mutual-inductor T
5secondary side connecting resistance R5, D.C mutual-inductor T
6secondary side connecting resistance R6; D.C mutual-inductor T
4, T
5and T
6lower end be respectively A3, B3 and C3, A3, B3 and C3 lower end is connected to a Thyristor A. C. voltage regulator respectively, concrete connection is as follows: from A3 three circuit in parallel, Article 1, circuit connects the anode of thyristor V1 from A3, the negative electrode of thyristor V1 connects A4(and K1 same point), gate pole g1 contacts the X11 of Power Generation Road; Article 2 circuit is resistance-capacitance circuit, and Article 2 circuit meets electric capacity C1 from A3, another termination A4 of the electric capacity C1 other end (107 point) connecting resistance R1, resistance R1, and this resistance-capacitance circuit is used for suppressing internal cause overvoltage, comprises phase conversion overvoltage and turns off overvoltage; Article 3 circuit connects the negative electrode of thyristor V4 from A3 (with K4 same point), and the anode of thyristor V4 meets A4, and gate pole g4 contacts the X41 of Power Generation Road.In like manner, from B3 three circuit in parallel, Article 1 circuit connects the anode of thyristor V3 from B3, and the negative electrode of thyristor V3 meets B4 (with K3 same point), and gate pole g3 contacts the X31 of Power Generation Road; Article 2 circuit meets electric capacity C2 from B3, another termination B4 of the electric capacity C2 other end (108 point) connecting resistance R2, resistance R2; Article 3 circuit connects the negative electrode of thyristor V6 from B3 (with K6 same point), and the anode of thyristor V6 meets B4, and gate pole g6 contacts the X61 of Power Generation Road; From C3 three circuit in parallel, Article 1 circuit connects the anode of thyristor V5 from C3, and the negative electrode of thyristor V5 meets C4 (with K5 same point), and gate pole g5 contacts the X51 of Power Generation Road; Article 2 circuit meets electric capacity C3 from C3, another termination C4 of the electric capacity C3 other end (109 point) connecting resistance R3, resistance R3; Article 3 circuit connects the negative electrode of thyristor V2 from C3 (with K2 same point), and the anode of thyristor V2 meets C4, and gate pole g2 contacts the X21 of Power Generation Road; The gate pole of above-mentioned 6 thyristor V1-V6 presses V1-V6 sequential turn-on, and the adjacent two turn on thyristors phase angle difference 60 degree in front and back, because rectified waveform is pulsed 6 times in one-period, is therefore called 6 pulse wave rectifiers.
Lower end A4, B4, C4 of three Thyristor A. C. voltage regulators are all connected with three-phase transformer T1, and three-phase transformer T1 primary side adopts delta connection from beginning to end, and three-phase transformer T1 secondary side A5, B5, C5 also adopt delta connection from beginning to end.
Three-phase transformer T1 exports termination three-phase bridge rectifier circuit.This three-phase bridge rectifier circuit has six brachium pontis, from A5 parallel diode V11 and V14, from B5 parallel diode V13 and V16, from C5 parallel diode V15 and V12, wherein output (100 point) the common anode pole of diode V11, V13, V15, output (101 point) common cathode of diode V14, V16, V12.
Three branch roads in parallel between 100 with 101 o'clock, wherein, Article 1 branch road meets slide rheostat RP1 from 100, this slide rheostat RP1 is in order to overcurrent value of adjusting, 1.1 times that adjust in rated current, lower termination 101 point of lower end (103 point) connecting resistance R7, the resistance R7 of rheostat RP1; Article 2 branch road is from lower termination 103 point of 100 connecting resistance R8, resistance R8; Article 3 branch road meets voltmeter PV from 100, another termination 101 point of voltmeter PV.
Relay-controlled Circuit:
As shown in Figure 1, Figure 3, described Relay-controlled Circuit is shut down instruction in order to realize comprising, is run instruction, power supply on/off switch, fault actions, hydraulic pressure instruction, faulty indication, failure reset function.
In bang-bang circuit, each indicator light rated voltage is for exchanging 24V, and each relay, time relay coil rated voltage are for exchanging 24V, contactor K
0coil rating voltage be 380V.Relay-controlled Circuit power supply leads to the primary side of control transformer T3 since B1 and C1 of major loop.The secondary side of control transformer T3 exports the voltage of three kinds of grades, is respectively (with 239 points) at 270 and exchanges 24V, power to control loop, and (18 with 19 points) exchange 6.3V and exchange 5V with (with 20 points) at 19.
The structure of control circuit is specific as follows: 6 branch roads below in parallel from the secondary side (270 point) of control transformer T3:
Article 1, branch road meets contactor K from 270
0auxiliary normally-closed contact upper end, contactor K
0auxiliary normally-closed contact lower end (111 point) meet red led HR1, lower termination 239 point of red led HR1, form shut down deixis.
Article 2 branch road meets contactor K from 270
0auxiliary normally opened contact upper end, contactor K
0auxiliary normally opened contact lower end (113 point) meet green indicating lamp HG1, lower termination 239 point of green indicating lamp HG1, form run deixis.
Article 3 branch road meets making button S from 270
2, realize the startup of control device, making button S
2carry out parallel connection as required, realize execute-in-place and remote operation various modes.Making button S
2one, lower end guide 113 points into, as making button S
2to operation instruction power supply during action, making button S
2another branch road of lower end meet dynamic circuit breaker button S
1, realize the stopping of control device, dynamic circuit breaker button S
1connect as required, realize execute-in-place and remote operation various modes.Connect in the present embodiment two dynamic circuit breaker button S
1, each dynamic circuit breaker button S
1lower end (117 point) contact relay K
2the upper end of auxiliary normally-closed contact, relay K
2the lower termination time relay κ of auxiliary normally-closed contact
1coil, time relay κ
1lower termination 239 point of coil; Time relay K
1auxiliary normally-closed contact access and 274 points of protective circuit respectively at 273, this branch road realizes power supply on/off switch.
Article 4 branch road connects the auxiliary normally opened contact of the relay K of protective circuit from 270, lower end (271 point) the contact relay K of the auxiliary normally opened contact of relay K
2coil, relay K
2lower termination 239 point of coil, relay K
2auxiliary normally opened contact access and 274 points respectively at 273.This branch road realizes fault actions function.
Article 5 branch road is from the upper end of 270 water receiving pressure sensor KL, the normally closed point in lower end of water pressure sensor KL connects 271 points, the lower end normal opened contact of water pressure sensor KL connects the upper end (121 point) of yellow indicator lamp HY, lower termination 239 point of yellow indicator lamp HY, as the instruction of thyristor water pressure of cooling water.
Article 6 branch road is from 270 contact relay K
2auxiliary normally opened contact, relay K
2auxiliary normally opened contact lower end (125 point) meet red led HR2, lower termination 239 point of red led HR2.This branch road realizes faulty indication.
Control circuit is from 268 and 269 access making button S of protective circuit
3, realize failure reset.
From major loop A1 point relay K turn-on time
1time delay open the instantaneous normally opened contact closed, time relay K
1time delay open instantaneous 308, the lower end of often opening closed, contact and meet contactor K
0coil, contactor K
0the lower termination main circuit B1 point of coil.
Relay-controlled Circuit operating process is as follows:
As main circuit air switch S
oafter closed, phase line B1 and C1 must exchange the line voltage of 380V, become the control power supply exchanging 24V power to control loop through control transformer T3.Halt indicator HR1 obtains electric bright.If all circuit does not have fault, be in normal condition, thyristor water pressure of cooling water is normal, and hydraulic pressure indicator light is bright, then can start-up circuit.When pressing making button S
2, time relay K
1coil obtains electric, time relay K
1time delay is opened the instantaneous normally opened contact closed and is closed, contactor K
0coil obtains electric, contactor K
0main circuit closes, and main circuit obtains electric, time relay K
1auxiliary normally-closed contact disconnect, protective circuit starts, each circuit start.After circuit start, regulate rectified value by slide rheostat RP2.
When pressing dynamic circuit breaker button S
1, time relay K
1coil losing electricity, time relay K
1the instantaneous normally opened contact Time Delay Opening closed is opened in time delay, contactor K
0coil time delay dead electricity, contactor K
0time delay main circuit dead electricity, contactor K
0auxiliary contact close, and all circuit stop.
Thyristor water pressure of cooling water under normal circumstances, the closing of contact of transducer KL, hydraulic pressure instruction is normal, otherwise, contacting 271 point of transducer KL, relay K
2coil obtains electric, relay K
2auxiliary normally-closed contact is opened, on/off switch circuit of cutting off the electricity supply, and auxiliary normally opened contact closes simultaneously, 273 of short circuit protective circuit and 274 points, and circuit stops.
When there is other faults in circuit, as situations such as phase shortage, overvoltage, overcurrent, short circuits, the normally opened contact of the relay K of protective circuit closes, relay K
2coil obtains electric, fault actions circuit ON.Relay K
2auxiliary auxiliary normally-closed contact disconnect, on/off switch circuit of cutting off the electricity supply, relay K
2auxiliary normally opened contact close, 273 of short circuit protective circuit and 274 points, circuit stop.
After fault is got rid of, press making button S
3, 268 of protective circuit and 269 connections, failure reset, now can restart circuit, otherwise circuit can not start.
Protective circuit:
As shown in Figure 1; synchrotrans T2 is drawn from main circuit A1, B1 and C1; synchrotrans T2 primary side and secondary side all adopt Y-connection; the 380V AC power that synchrotrans T2 inputs goes out the DC power supply of 15V by the uncontrollable circuit rectifies of three-phase bridge; power output end is 241,242,243,240 points; connect protective circuit and circuits for triggering respectively, power for protective circuit and circuits for triggering and synchronizing signal is provided.
As Figure 1 and Figure 4, the port numbering 24bz of protective circuit connects 241 points of synchrotrans T2, and numbering 26bz connects 242 points of synchrotrans T2, and numbering 28bz connects 243 points of synchrotrans T2, and numbering 30bz connects 240 points of synchrotrans T2; Numbering 18bz connects 282 points of slide rheostat RP1, and numbering 20bz connects 281 points of slide rheostat RP1, and part 18d connects 280 points of slide rheostat RP1, adjusts as voltage; Switch S is selected in numbering 12bz selecting
4278 points, switch S is selected in numbering 14bz selecting
4279 points, switch S is selected in numbering 14d selecting
4277 points, switch S is selected in 16d selecting
4283 points, select as manual voltage stabilization and current stabilization; 8bz meets contactor K
0auxiliary normally-closed contact 274 point, 8d meets contactor K
0auxiliary normally-closed contact 273 point; 2bz connection control circuit 270 point, 4bz connection control circuit 271 point, in order to the fault actions of realizing circuit; 284 points of switch S 4 are selected in 2d selecting, 4d and 6d connects the two ends (and 269 points) of making button S3 at 268, realizes failure reset function.10d connects main circuit 275 point, and 12d connects main circuit 276 point, as current detecting; 20d connects the 2bz port (244 point) of digital flip flop.
Protective circuit inside comprises pile defection part, over-current detection part, overvoltage test section, Current amplifier part, dams and adjuster part, given integral part.
Element DF783A is the core devices of lack detection circuit, is numbered D2 in circuit diagram.When phase shortage, it is 0, V41 when red instruction phase shortage that 9 pin of D2 export, and blocks the output of the amplifier N8 of amplifier N7 and given integrating circuit simultaneously, makes pulse move on to 150 ° and realize the inversion of this bridge, and make relay K timing closing through D1, send fault-signal.
Amplifier N3, N4 are respectively over-current detection circuit and over-voltage detection circuit core devices, all adopt LM741 chip.When overcurrent or overvoltage, it is 0 that 6 pin of N3 or N4 export, at this time V20 when red or V32 when red, instruction overcurrent or overvoltage, block the output of the amplifier N8 of adjuster N7 and given integrating circuit simultaneously, make trigger impulse move to 150 ° and realize the inversion of this bridge, and make relay timing closing through D1, send fault-signal.Wherein, slide rheostat RP1 in order to overcurrent value of adjusting, the present invention's 1.1 times of adjusting as rated current.Slide rheostat RP2 in order to overpressure value of adjusting, the present invention's 1.1 times of adjusting as rated voltage.
N5 is the core devices of current amplification circuit, adopts LM741 chip.75mV signal (and 276 points) from shunt is sent into No. 3 pins of N5 at 275, be amplified to 4 ~ 6V through N5.The current signal after amplifying is exported from No. 6 pins of N5.
N7 dams and the core devices of adjuster circuit, adopts LM741 chip.Current signal compares with RP6 setting value after N5 amplifies, and when exceeding set-point, 1 pin of N7 exports " 1 " to adjuster, changes the operating state of adjuster, is clamped down on by the voltage U k of 14 pin of N7 in the scope of setting, realizes damming.When not reaching RP6 setting value, 1 pin of N7 exports about-14V, the reverse bias of V37 is equivalent to open circuit, if at this time exist for a certain reason, makes main circuit output voltage Ud increase or declines, then feedback signal is added to 10 pin of N7 by 278, make the 8 pin current potentials of N7 raise or reduce, and then make the voltage U k of 14 pin of N7 reduce or increase, controlling angled a increases or reduces, Ud is declined or rises, to maintain metastable state.
N8 is given integrating circuit core devices, adopts LM741 chip.Cushion for the signal given to potentiometer, realize slowly given, i.e. soft start.Regulate RP7 can change its time of integration, regulate RP3 to adjust its bottoming, it exports upper limit to regulate RP4 to adjust.
Circuits for triggering:
The synchronizing signal of circuits for triggering is provided by external circuit synchrotrans T2, through the filtering of RC resistance capacitance and compare amplification, find out the zero crossing of triggering synchronous signal, by digit counter time delay, timer triggers pulsewidth and carries out high frequency modulated, and the gate leve finally trigger impulse produced being sent into each thyristor of main circuit triggers.
As shown in Figure 1, shown in Figure 5, the port 2d of described circuits for triggering connects 240 points of synchrotrans T2, and 4d connects 241 points of synchrotrans T2, and 6d connects 242 points of synchrotrans T2, and 8d connects 243 points of synchrotrans T2, and 248 points of switch S 4 are selected in 10d selecting.2bz is connected with protective circuit (wire size 244 point).4bz meets the D.C mutual-inductor T of main circuit power A phase
4245 points, 6bz meets the D.C mutual-inductor T of main circuit B phase
5246 points, 8bz meets the AC voltage transformer T of main circuit C phase
6247 points; X11 meets the gate pole g1 of the thyristor V1 of main circuit A phase, and X12 connects the K1 point of main circuit A phase; X21 meets the gate pole g2 of main circuit C phase thyristor V2, and X22 connects the K2 point of main circuit C phase; X31 meets the gate pole g3 of the thyristor V3 of main circuit B phase, and X32 connects the K3 point of main circuit B phase; X41 meets the gate pole g4 of the thyristor V4 of main circuit A phase, and X42 connects the K4 point of main circuit A phase; X51 meets the gate pole g5 of the thyristor V5 of main circuit C phase, and X52 connects the K5 point of main circuit C phase; X61 meets the gate pole g6 of the thyristor V6 of main circuit B phase, and X62 connects the K6 point of main circuit B phase.These 6 groups of triggerings as the thyristor of main circuit export.
As shown in Figure 6, circuits for triggering principle is as follows:
TPA, TPB, TPC, TP0 are respectively synchronizing signal, and sampled point waveform is as shown in Figure 4, consistent with power supply wave shape.After capacitance-resistance phase shift, LM324 is adopted) to this circuit of chip 324(, LM324 is the four-operational amplifier with differential input, numbering N2 in circuit diagram, this chip is used as zero-crossing comparator, output waveform forms square wave through 324, CD40106 chip is adopted again through this circuit of inverter chip 40106(, six Schmidt triggers) shaping, chip 40106 is made up of six Schmitt trigger circuits, circuit diagram numbering D11, and sampled point waveform is as TP4, TP5, TP6 of Fig. 4, when power supply is positive, waveform is synchronous square wave with power supply.Pulse-shaping stage is delivered to after shaping.Before shaping with shaping after signal deliver to circuit diagram and number 3 two of being respectively D5, D8, D12 and input this circuit of NOR gate 4001(and adopt CD4001 42 input NOR gate chip), by 3 4020 chips, (this circuit adopts CD4020 chip, 14 grades of serial binary counting/frequency dividers) frequency division, they be numbered D6, D9, D13; Chip 4,020 one aspect accepts the signal from chip 4001, accepts the burst signal from the conversion of V/F voltage-frequency on the one hand, and V/F voltage-frequency conversion sampled point waveform is as the TP7 of Fig. 4.Export 6 road rectangular pulses from 10 pin of D5, D8, D12 and 4 pin, sampled point waveform is as TP11, TP12, TP13 of Fig. 2.Changed the pilot angle of trigger impulse by phase shift controlling voltage, D3 is wherein accurate voltage-frequency converter part, selects model AD650.When the 9 pin current potentials of D3 change between 15 ~ 0V, controlling angled a changes between 0 ~ 150 °, therefore, only given potentiometer need be regulated just can easily to change pilot angle, thus the conducting controlling Thyristor is interval, achieves the adjustment of output voltage.
Through 3 556 chips (this circuit adopts NE556) shaping pulse modulation fixed width (circuit diagram numbering is respectively D7, D10, D14), sampled point waveform, as the TP8 of Fig. 4, is a series of pulse.2 pin of 556 and 6 pin also connect prime input, 2 pin judgment thresholds, 6 pin are used as to trigger, 8 pin and 12 pin also connect the input signal of prime, 12 pin judgment thresholds, and 8 pin are used as to trigger, 5 pin and 9 pin connect output signal, 1 pin and 7 pin ground connection, 4 pin and 10 pin receive and adopt NE555 from this circuit of chip 555() reset signal of timer, 14 pin are chip powers.
Form multi-resonant oscillating circuit (circuit diagram numbering D4) by 555 timers, produce pulse signal, this chip can reduce the volume of trigger impulse transformer.1 pin ground connection, 8 pin connect chip power.2 pin are KJ041(circuit diagram numbering D15) trigger end, 3 pin are output signals of 555, reset to 556.4 pin are 555 self reset signals.7 pin meet Light-Emitting Diode HL1.
The inner integrated KJ041 of digital flip flop, the sampling of realizing circuit, synchronous, pulse shaping, pulse phase shifting, pulse shaping, pulse deinterleaving and pulse amplifying.It by 12 diodes form 6 or, convert 6 road pulse inputs to 6 road pulse-pair outputs.D15 dipulse is formed and after V18, V19, V33, V34, V45, V46 power amplifier, exports from corresponding terminal.Triggering waveform sampling point waveform as TP21, TP22, TP23, TP26 of Fig. 4, is one group of two burst pulse ripple.
Protection value is adjusted:
RP1 adjusts overcurrent value, the present invention's 1.1 times of adjusting in rated current.
PR2 adjusts overpressure value, the present invention's 1.1 times of adjusting in rated voltage.
RP3 when DL2 short circuit and given maximum, adjusts 1.2 times that export as the specified output dc voltage of equipment.
RP4 does not adjust when DL short circuit.
RP6 adjusts shut off value, and the present invention adjusts as load current value.
RP7 adjusts soft-start time, and the time of integration of adjusting is longer, start slower steadily.
Circuits for triggering each point waveform as shown in Figure 4.
Claims (2)
1. a direct current silicon commutating power supply, is characterized in that, comprises major loop, Relay-controlled Circuit, protective circuit and circuits for triggering; Wherein, described Relay-controlled Circuit, protective circuit are connected major loop respectively with circuits for triggering, and Relay-controlled Circuit connects protective circuit, and protective circuit is connected with circuits for triggering;
Described major loop comprises three-phase alternating-current supply, contactor, D.C mutual-inductor, Thyristor A. C. voltage regulator, three-phase transformer and three-phase bridge rectifier circuit; Wherein, described three-phase alternating-current supply connects three D.C mutual-inductors by contactor, D.C mutual-inductor lower end connects Thyristor A. C. voltage regulator respectively, the lower end A4 point of Thyristor A. C. voltage regulator, B4 point, C4 point connect described three-phase transformer jointly, and three-phase transformer connects described three-phase bridge rectifier circuit;
The power supply of described major loop is three-phase alternating-current supply, and A phase, the B phase of three-phase alternating-current supply install three-phase air switch S with C phase
o, three-phase air switch S
olower end A1 point, B1 point and C1 point all with contactor K
0main contacts be connected; Contactor K
0main contacts lower end A2 point, B2 point be connected D.C mutual-inductor T respectively with C2 point
4, T
5and T
6; D.C mutual-inductor T
4second siding ring two ends connecting resistance R4, in case D.C mutual-inductor secondary circuit short-circuit; D.C mutual-inductor T
5second siding ring two ends connecting resistance R5, D.C mutual-inductor T
6second siding ring two ends connecting resistance R6; D.C mutual-inductor T
4, T
5and T
6lower end be respectively A3 point, B3 point and C3 point, A3 point, B3 point and C3 point lower end are connected to a Thyristor A. C. voltage regulator respectively, concrete connection is as follows: from A3 point connection three circuit, Article 1, circuit connects the anode of thyristor V1 from A3 point, the negative electrode of thyristor V1 connects A4 point, and gate pole g1 contacts the first output X11 point of Power Generation Road; Article 2 circuit is resistance-capacitance circuit, and Article 2 circuit connects one end of electric capacity C1 from A3 point, one end of electric capacity C1 other end connecting resistance R1, another termination A4 point of resistance R1, and this resistance-capacitance circuit is used for suppressing internal cause overvoltage, comprises phase conversion overvoltage and turns off overvoltage; Article 3 circuit connects the negative electrode of thyristor V4 from A3 point, and the anode of thyristor V4 connects A4 point, and gate pole g4 contacts the 4th output X41 point of Power Generation Road; In like manner, from B3 point connection three circuit, Article 1 circuit connects the anode of thyristor V3 from B3 point, and the negative electrode of thyristor V3 connects B4 point, and gate pole g3 contacts the 3rd output X31 point of Power Generation Road; Article 2 circuit connects one end of electric capacity C2 from B3 point, one end of electric capacity C2 other end connecting resistance R2, another termination B4 point of resistance R2; Article 3 circuit connects the negative electrode of thyristor V6 from B3 point, and the anode of thyristor V6 connects B4 point, and gate pole g6 contacts the 6th output X61 point of Power Generation Road; From C3 point connection three circuit, Article 1 circuit connects the anode of thyristor V5 from C3 point, and the negative electrode of thyristor V5 connects C4 point, and gate pole g5 contacts the 5th output X51 point of Power Generation Road; Article 2 circuit connects one end of electric capacity C3 from C3 point, one end of electric capacity C3 other end connecting resistance R3, another termination C4 point of resistance R3; Article 3 circuit connects the negative electrode of thyristor V2 from C3 point, and the anode of thyristor V2 meets C4, and gate pole g2 contacts the second output X21 point of Power Generation Road; The gate pole of thyristor V1-V6 presses V1-V6 sequential turn-on, the adjacent two turn on thyristors phase angle difference 60 degree in front and back;
The lower end A4 point of three Thyristor A. C. voltage regulators, B4 point, C4 point are all connected with three-phase transformer T1, three-phase transformer T1 primary side adopts delta connection from beginning to end, and three-phase transformer T1 secondary side A5 point, B5 point, C5 point also adopt delta connection from beginning to end;
Three-phase transformer T1 exports termination three-phase bridge rectifier circuit; This three-phase bridge rectifier circuit has six brachium pontis, A5 point connects the negative pole of diode V11 and the positive pole of diode V14, B5 point connects the negative pole of diode V13 and the positive pole of diode V16, C5 point connects the negative pole of diode V15 and the positive pole of diode V12, wherein diode V11, V13, V15 common anode pole, be designated as 100 points, diode V14, V16, V12 common cathode, be designated as 101 points;
Three branch roads in parallel between 100 with 101 o'clock, wherein, Article 1, branch road connects one end of slide rheostat RP1 from 100, this slide rheostat RP1 is in order to overcurrent value of adjusting, 1.1 times that adjust in rated current, one end of the other end connecting resistance R7 of rheostat RP1, another termination 101 point of resistance R7; Article 2 branch road from one end of 100 connecting resistance R8, another termination 103 point of resistance R8; Article 3 branch road connects one end of voltmeter PV from 100, another termination 101 point of voltmeter PV;
Described 103 is the other end of rheostat RP1.
2. direct current silicon commutating power supply as claimed in claim 1, is characterized in that, the power supply of described Relay-controlled Circuit leads to the primary side of control transformer T3 since the B1 point of major loop and C1 point; The secondary side of control transformer T3 exports the voltage of three kinds of grades, is respectively and exchanges 24V, exchanges 6.3V and exchanges 5V.
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| CN103986347B (en) * | 2014-05-12 | 2016-09-14 | 东南大学 | A kind of three-phase semi-controlled bridge type rectification triggering circuit with defencive function |
| CN104184436B (en) * | 2014-07-29 | 2017-02-15 | 中国航天科技集团公司第九研究院第七七一研究所 | Triggerable accurate timing circuit with wide supply voltage range |
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| CN109639159B (en) * | 2018-12-18 | 2024-04-02 | 辽宁恒顺新能源科技有限公司 | High-voltage rectifying system |
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| CN113658815B (en) * | 2021-08-06 | 2023-10-13 | 江苏威腾配电有限公司 | Interlocking control circuit for three-phase-sequence phase-change switch |
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