CN201629687U - DC stringing rectifying power supply for mine - Google Patents

Abstract

The utility model discloses a DC stringing rectifying power supply for a mine, comprising an AC contactor, a voltage transformer, a current transformer, a rectifying and chopping circuit and a microprocessor, wherein an external AC power supply is connected with the rectifying and chopping circuit through the AC contactor; the rectifying and chopping circuit outputs stable DC voltage to a stringing output circuit; the AC contactor, the voltage transformer and the current transformer are respectively connected with the microprocessor; the DC voltage feedback is connected with the microprocessor; and the control signal of the microprocessor is respectively connected with the AC contactor and the rectifying and chopping circuit. The utility model has the advantages that when the field power grid fluctuates, the stable output of the DC voltage is realized by regulating the duty cycle of the output pulse, and convenience is brought for the production enterprises and the users. Meanwhile, by adopting the microprocessor and an upper computer, the intelligent processing is realized, the sampling can be carried out for the output current and the AC input voltage, when the set threshold value is exceeded, the system quickly cuts off the AC contactor of a main circuit, thereby improving the safety of the DC stringing traction operation for the mine.

Description

Mining dc electric rectifier power source

Technical field

The utility model relates to the mine power-supply device, particularly a kind of mining dc electric rectifier power source.

Background technology

Stringing formula direct-current electric locomotive is the widely used means of transportation in China's coal-mine down-hole always, and in quite long from now on period, its important function can not replaced fully by other means of transportation.Electric locomotive dc electric traction networking electric power system is the important component part that constitutes Orbital Transport Systems, is the electrical source of power of electric locomotive.Stringing electrical locomotive DC traction network mainly partly is made up of traction current transformation institute, feed line, contact wire, partition switch, track return wire etc.The DC power supply that traction current transformation is exported is made up of transformer and rectifier power source.At present, the circuit topology of the rectifier power source of employing mainly is the three phase full bridge diode rectification, function singleness, poor effect.The output voltage of rectifier power source fluctuates along with the fluctuation of line voltage, and the while, the output voltage of rectifier power source changed along with the variation of load again owing to the existence of the internal resistance of transformer.That is to say that the line regulation of rectifier power source and load regulation are very low, and be uncontrollable, can't export adjustable stable DC voltage.

Except electric locomotive, also have miscellaneous equipment on the dc electric network of colliery, comprise various partition switches, bend signal alarm, dc welding machine, auto-power-cutting switch etc.Because the fluctuation of dc electric rectifier power source output voltage, these equipment can't be operated under the rated condition.When the drawing electric network voltage fluctuation is big, the high pressure spike appears, although the duration is very short, but there are enough energy to damage these equipment.Therefore, dc electric rectifier power source output galvanic current is pressed, and this has great significance to improving colliery dc electric transportation safety effect and conevying efficiency, and does not also have this power supply product to occur at present.

The utility model content

The purpose of this utility model is to overcome above-mentioned defective, and a kind of stable DC voltage output that has is provided, and can improve the mining dc electric rectifier power source of colliery dc electric operational security.

For achieving the above object, the mining dc electric rectifier power source that the utility model provides, comprise A.C. contactor, voltage transformer, current transformer, rectification chopper circuit and microprocessor, external AC power supply is connected to the rectification chopper circuit through A.C. contactor, the rectification chopper circuit is to stringing output loop output stable DC voltage, voltage transformer is connected to the input of rectification chopper circuit, current transformer is serially connected with in the stringing output loop, A.C. contactor, voltage transformer, current transformer links to each other with microprocessor respectively, the direct voltage feedback is connected to microprocessor, and microprocessor control signal is connected to A.C. contactor and rectification chopper circuit respectively.

The utility model is mining dc electric rectifier power source, wherein said microprocessor is provided with the RS232 interface that is used for carrying out with host computer transfer of data.

The utility model is mining dc electric rectifier power source, wherein said rectification chopper circuit is made of three-phase controllable silicon fully controlled bridge and the series connection of copped wave diode.

The utility model is mining dc electric rectifier power source, wherein said microprocessor is provided with CPU and coupled:

The AD modular converter, the analog signal conversion that is used for the voltage transformer summation current transformer is a digital signal;

The simultaneous phase-shifting trigger module is used to form the trigger impulse of three-phase controllable silicon fully controlled bridge circuits for triggering;

Time block is used for regularly starting and turn-offing the simultaneous phase-shifting trigger module;

Comparison module: be used to judge whether dc electric voltage drops to zero, and output control signals to time block.

The utility model is mining dc electric rectifier power source, wherein said rectification chopper circuit is made of three-phase diode rectifier bridge and DC chopper circuit series connection.

The utility model is mining dc electric rectifier power source, wherein said microprocessor is provided with CPU and coupled:

The AD modular converter, the analog signal conversion that is used for the voltage transformer summation current transformer is a digital signal;

PWM module: be used for triggering signal to three-phase diode rectifier bridge output PWM;

Another time block is used to export the duty ratio D of direct current batch (-type) voltage, regularly starts and turn-offs the PWM trigger module.

The advantage and the good effect of the utility model is mining dc electric rectifier power source are: owing to be provided with A.C. contactor, voltage transformer, current transformer, rectification chopper circuit and microprocessor, when on-the-spot drawing electric network voltage fluctuation, by adjusting the output duty of ratio, realize the stable output of direct voltage, bring convenience for manufacturing enterprise and user.

Simultaneously; adopt microprocessor and host computer; realize intelligent the processing; can be by output current and AC-input voltage be sampled; system can cut off the A.C. contactor of main circuit rapidly when surpassing setting protection value; thereby realize overcurrent and overvoltage protection, improve the fail safe of colliery dc electric towage greatly.

Be elaborated with reference to accompanying drawing below in conjunction with embodiment.

Description of drawings

Fig. 1 is the block diagram of the mining dc electric rectifier power source of the utility model;

Fig. 2 is the circuit theory diagrams of rectification chopper circuit among the embodiment one;

Fig. 3 is the output waveform figure of rectification chopper circuit among the embodiment one;

Fig. 4 is the circuit theory diagrams of rectification chopper circuit among the embodiment two;

Fig. 5 is the output waveform figure of rectification chopper circuit among the embodiment two.

Embodiment

Here provide the mining dc electric rectifier power source of the utility model two kinds of implementations, describe the embodiment of the mining dc electric rectifier power source of the utility model below in conjunction with accompanying drawing in detail.

Embodiment one

With reference to Fig. 1, the utility model is mining dc electric rectifier power source comprises A.C. contactor 1, voltage transformer 4, current transformer 3, rectification chopper circuit 2 and microprocessor 5.Current transformer 3 adopts the direct current Hall element, and voltage transformer 4 adopts the alternating voltage Hall element.Voltage transformer 4 is connected to the input of rectification chopper circuit 2, and current transformer 3 is serially connected with in the stringing output loop, and A.C. contactor 1, voltage transformer 4, current transformer 3 link to each other with microprocessor 5 respectively.Direct voltage Ud feedback is connected to microprocessor 5, and the control signal of microprocessor 5 is connected to A.C. contactor 1 and rectification chopper circuit 2 respectively.External AC power supply is connected to rectification chopper circuit 2 through A.C. contactor 1, and rectification chopper circuit 2 is to stringing output loop output stable DC voltage U d.

Rectification chopper circuit 2 can adopt two kinds of circuit forms: in first kind of rectification chopper circuit 2, be provided with three-phase controllable silicon fully controlled bridge KP1-KP6, the circuits for triggering of this controllable silicon fully controlled bridge are controlled by microprocessor 5.Consult Fig. 2, rectification chopper circuit 2 is made of three-phase controllable silicon fully controlled bridge KP1-KP6 and copped wave diode VD series connection, and rectification function and copped wave function realize in this circuit.M among Fig. 1 represents load motor, and colliery scene is most popular to be DC series excitation traction motor, and the inductance string that is to say excitation winding so just can save afterflow inductance required in the rectification chopper circuit 2 in the loop.

Microprocessor 5 is provided with CPU and coupled following module:

The AD modular converter, the analog signal conversion that is used for voltage transformer 4 summation current transformers 3 is a digital signal.The simultaneous phase-shifting trigger module is used to form the trigger impulse of three-phase controllable silicon fully controlled bridge circuits for triggering, and the driving of three-phase controllable silicon fully controlled bridge KP1-KP6 is finished by the simultaneous phase-shifting trigger module, the triggering signal of output and main circuit synchronised.The trigger impulse square wave forms in time block.Time block is used for regularly starting and turn-offing the simultaneous phase-shifting trigger module, and its output signal forms the control end that circuit, power amplifier and lock-out pulse transformer export rectification chopper circuit 2 to through trigger impulse.Comparison module is used to judge whether dc electric voltage drops to zero, and outputs control signals to time block.

In the embodiment of the mining dc electric rectifier power source of the utility model, microprocessor 5 also is provided with the RS232 interface that is used for carrying out with host computer 6 transfer of data.

Describe the course of work of the mining dc electric rectifier power source of the utility model in detail below in conjunction with accompanying drawing.

It is open-minded one by one that microprocessor 5 is crossed the start pulse signal control three-phase controllable silicon fully controlled bridge that time block produces, and in three-phase controllable silicon fully controlled bridge conduction period, produces the asymmetrical square wave circuit and provide the forward Voltage pulsating direct-current supply to dc electric, through timing t ₁After, microprocessor 5 sends cut-off signals and turn-offs the three-phase controllable silicon fully controlled bridge, comparison module detects dc electric voltage and whether drops to zero, and carry out reliability and judge, determine whether reliable turn-off of three-phase controllable silicon fully controlled bridge, this moment, the electric current of load motor M did not have too big decline, because the magnetizing inductance of copped wave diode VD in the circuit and load motor M constitutes continuous current circuit.Be issued to output voltage from cut-off signals to zero required time t ₂After, output draws the time t that also needs time-delay is waited for to microprocessor 5 according to the forward Voltage pulsating direct-current supply ₃At timing t ₃After arriving, microprocessor 5 sends Continuity signal once more.

If U _sBe the average output dc voltage of three-phase diode full-bridge rectification, U ₁Effective value for input three-phase alternating current line voltage then has: U _s=1.35U ₁, the average voltage of forward Voltage pulsating direct-current supply output is:

$U_d=(U_s*t_s+{\&Integral;}_0^{\mathrm{\&pi;}/2}\sqrt{2}{\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="HDA0000020132530000011.png"\; state="\{\{state\}\}">U</figure-callout>}}_1\cos \mathrm{\&omega;td\&omega;t})/T=(1.35*t_s+\sqrt{2})*{\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="HDA0000020132530000011.png"\; state="\{\{state\}\}">U</figure-callout>}}_1/T,$

Wherein, T is discontinuous operation cycle time, then has

T＝t ₁+t ₂+t ₃，

t _sBe the lasting time of above-mentioned average voltage.Because the line voltage frequency is 50HZ, therefore have

t _s＝t ₁+t ₂-20ms/4。

In the control procedure of microprocessor 5, microprocessor 5 timing t ₁Constant, t ₂Can draw by counting, will obtain preestablishing the forward Voltage pulsating direct-current supply of output voltage size so, work as U ₁After over-sampling calculates, only need to calculate t according to following formula ₃Get final product:

$t_3=(1.35*({\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000020132530000011.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+t_2-5\mathrm{ms})+\sqrt{2})*{\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="HDA0000020132530000011.png"\; state="\{\{state\}\}">U</figure-callout>}}_1/U_d-({\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000020132530000011.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+t_2),$

Its output waveform as shown in Figure 3.

Embodiment two

The utility model is mining dc electric rectifier power source, wherein rectification chopper circuit 2 and microprocessor 5 can also adopt another kind of scheme.With reference to Fig. 4, another kind of rectification chopper circuit 2 replaces with DC chopper circuit G1, the D that comprises three-phase diode rectifier bridge D1-D6 and series connection with it, and the chopper G1 of this DC chopper circuit is controlled by microprocessor 5.Microprocessor 5 is except that being provided with CPU and coupled AD modular converter, also be provided with the PWM module and the duty ratio D that is used for determining direct current batch (-type) voltage that are used for to three-phase diode rectifier bridge D1-D6 output PWM triggering signal, regularly start and turn-off another time block of PWM trigger module, promptly microprocessor 5 is the batch (-type) voltage of D by another time block and PWM trigger module output dc voltage duty ratio.The turn-on and turn-off of PWM trigger module timing controlled dc electric rectifier power source output, equivalence is regularly the intermittently used dc supply, the i.e. pulse that has certain frequency and duty ratio by three-phase diode rectifier bridge D1-D6 output, according to the conservation of energy, the intermittent pulse voltage of output can equivalence be the direct voltage of pulse voltage mean value.When power supply dragged load motor M, load current was only relevant with load torque, kept constant substantially during stable state.Therefore, when input ac voltage variation or load variations, only need to change the output duty of ratio and just can make that the output voltage of dc electric rectifier power source remains unchanged, thus the realization voltage stabilizing function, and its output waveform is as shown in Figure 5.

Same microprocessor 5 is provided with the RS232 interface that carries out transfer of data with host computer 6, and other parts are identical with embodiment one structure.

The utility model is mining dc electric rectifier power source by detecting the three-phase alternating current line voltage of input, is adjusted the output duty of ratio, thereby realizes the stable output of direct voltage.Adopt microprocessor and host computer, can set the output voltage of system easily, realize intelligent control, the reliability of system improves greatly.

Adopt microprocessor that output current and AC-input voltage are sampled; when surpassing, average anode current or AC-input voltage set the protection value; system can cut off the A.C. contactor of main circuit rapidly; thereby realize overcurrent and overvoltage protection, improve the fail safe of colliery dc electric towage greatly.

In addition, microprocessor can pass to host computer with detected data parameters, and host computer can be with data by liquid crystal display displays, all right sound and light alarm when the protection fault occurring, and time and the fault type at that time and the fault value of record trouble generation.Because these are known technology, repeat no more here.

Embodiment recited above is described preferred implementation of the present utility model; be not that design of the present utility model and scope are limited; do not breaking away under the utility model design prerequisite; common engineers and technicians make the technical solution of the utility model in this area various modification and improvement; all should fall into protection range of the present utility model; the technology contents that the utility model is asked for protection all is documented in claims.

Claims (6)

1. mining dc electric rectifier power source, it is characterized in that: comprise A.C. contactor (1), voltage transformer (4), current transformer (3), rectification chopper circuit (2) and microprocessor (5), external AC power supply is connected to rectification chopper circuit (2) through A.C. contactor (1), rectification chopper circuit (2) is to stringing output loop output stable DC voltage (Ud), voltage transformer (4) is connected to the input of rectification chopper circuit (2), current transformer (3) is serially connected with in the stringing output loop, A.C. contactor (1), voltage transformer (4), current transformer (3) links to each other with microprocessor (5) respectively, direct voltage (Ud) feedback is connected to microprocessor (5), and the control signal of microprocessor (5) is connected to A.C. contactor (1) and rectification chopper circuit (2) respectively.

2. mining dc electric rectifier power source according to claim 1 is characterized in that: wherein said microprocessor (5) is provided with the RS232 interface that is used for carrying out with host computer (6) transfer of data.

3. the mining dc electric rectifier power source with chopper circuit according to claim 1 and 2 is characterized in that, wherein said rectification chopper circuit (2) is made of three-phase controllable silicon fully controlled bridge (KP1-KP6) and copped wave diode (VD) series connection.

4. the mining dc electric rectifier power source with chopper circuit according to claim 3, it is characterized in that: wherein said microprocessor (5) is provided with CPU and coupled:

The AD modular converter, the analog signal conversion that is used for voltage transformer (4) summation current transformer (3) is a digital signal;

The simultaneous phase-shifting trigger module is used to form the trigger impulse of three-phase controllable silicon fully controlled bridge (KP1-KP6) circuits for triggering;

Time block is used for regularly starting and turn-offing the simultaneous phase-shifting trigger module;

Comparison module: be used to judge whether dc electric voltage drops to zero, and output control signals to time block.

5. the mining dc electric rectifier power source with chopper circuit according to claim 1 and 2 is characterized in that, wherein said rectification chopper circuit (2) is made of three-phase diode rectifier bridge (D1-D6) and DC chopper circuit (G1, D) series connection.

6. the mining dc electric rectifier power source with chopper circuit according to claim 5, it is characterized in that: wherein said microprocessor (5) is provided with CPU and coupled:

The AD modular converter, the analog signal conversion that is used for voltage transformer (4) summation current transformer (3) is a digital signal;

PWM module: be used for triggering signal to three-phase diode rectifier bridge (D1-D6) output PWM;

Another time block is used to export the duty ratio D of direct current batch (-type) voltage, regularly starts and turn-offs the PWM trigger module.

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