CN2309015Y - Vehicle mains of novel d. c. mine electric locomotive - Google Patents

Abstract

The utility model belongs to power transforming equipment which transforms direct current into direct current. The utility model transforms direct current voltage of 1500v to direct current voltage of 48v. To solve the problem of high pressure inversion, circuits adopt double half-bridge connection in series by IGBT, and the direct current voltage of 1500v is split into two paths of direct current voltage of 750v, and the direct current voltage of 750v is then changed into alternating current voltage of 20KHZ through the IGBT. Once circuits of two half-bridge transformers are connected in parallel; the transformers outputs direct current voltage of 48v through the full-wave rectification filtering for the second time. A controlling circuit is composed of a voltage feedback device 1, a current feedback device 2, a PWM controller, a protective circuit 4 anddrivers 5 and 6. The utility model can serve as the vehicle-mounted power supply of industrial & mineral electric locomotives with 1500v direct current. The utility model has the characteristics of small size, light weight, no noise, few power expenditure, low failure rate, etc.

Description

Novel DC industrial and mineral electric locomotive vehicle power

The utility model belongs to the electric power conversion apparatus of DC converting to direct current

Industrial and mineral electric locomotive vehicle power mostly is the 1500v DC motor and drives a 48v DC generator power supply at present, and its volume is big, noise is big, power consumption is big, fault is many, maintenance cost is high.

At above-mentioned shortcoming, it is little to design this volume, and noise is low, little power consumption, the Novel DC industrial and mineral electric locomotive vehicle power that failure rate is low.

The utility model is that the 1500v direct voltage with the industrial and mineral electric locomotive utilizes pulse modulation technology that it is become the alternating voltage of 20KHZ, become low pressure 20KHZ alternating voltage through transformer, become low pressure 48v direct voltage through rectifying and wave-filtering again, this 48v direct voltage is as charge in batteries, illumination and control power supply in the electric locomotive.

The utility model adopts advanced semiconductor device IGBT to use as pulse-width modulation, modulating frequency reaches 20KHZ, but IGBT bears voltage certain limitation is arranged, an IGBT can not bear the 1500v direct voltage, yet and the electric locomotive mains fluctuations are very big, reach as high as more than the 2000v, so the voltage that IGBT bears must leave very big leeway, could guarantee safe operation.The utility model adopts the way of doube bridge series connection, and the 1500v direct voltage is divided into two 750v direct voltages, and IGBT adopts the withstand voltage element of 1800v, and 2.4 times coefficient of safety is so just arranged.Two bridge series connection must solve the output AXIALLY SYMMETRIC PROBLEMS, and the utility model adopts two primary winding ways of a transformer to solve, and two complete symmetries of primary winding are wound on the same iron core, have guaranteed the symmetry of circuit and magnetic circuit.The voltage of induction, electric current are on same secondary coil, and secondary 20KHZ alternating voltage is through full-wave rectification bridge rectification output, again through inductance, capacitor filter output 48v direct voltage.

The utility model is owing to adopt advanced semiconductor device IGBT as pulse-width modulation usefulness, makes that the contravariant transformer volume is little, noiselessness, little power consumption, failure rate be low.

Accompanying drawing is the circuit diagram of this utility model.

Wherein: the 1st, voltage feedback unit; The 2nd, the current feedback unit; The 3rd, the PWM controller;

The 4th, protected location; The 5th, last bridge driver; The 6th, following bridge driver;

C1, C2, C4, C5 are dividing potential drop electric capacity; C3, C6 are interlinkage electric capacity;

T1.1, T1.2, T1.3 are 20KHZ transformer first and second coils;

D2, D2, D3, D4 are fast diodes; L is a filter capacitor;

C is a filter capacitor; IGBT1, IGBT2, IGBT3,

IGBT4 is the insulated gate diode transistor.

Below in conjunction with accompanying drawing concrete enforcement of the present utility model is described further.

Average voltage is 375v on C1, C2, each electric capacity of C4, C5, IGBT1 and IGBT3 conducting simultaneously during positive half wave, and C1 discharges to T1.1 through IGBT1 and C3, formation+375v electric pulse, C4 discharges to T1.2 through IGBT3 and C6, also forms one+375vd electric pulse; IGBT2 and IGBT4 conducting simultaneously during negative half-wave, discharge forms one-375v electric pulse to C2 to T1.1 through IGBT2 and C3, and C5 discharges to T1.2 through IGBT4 and C6, also forms one-375v electric pulse.On T1.1 and the T1.2+375v and-375v electric pulse superposition responds to a positive and negative approximately 50v electric pulse on transformer secondary coil T1.3, its pulse duration is adjustable, when the secondary load electric current is big, adjusts pulse duration and broadens, when electric current hour, adjust pulse duration and narrow down.The adjustment of pulse duration is adjusted according to the signal of voltage feedback unit 1 and the signal magnitude of current feedback unit 2 automatically by PWM controller 3, reaches voltage stabilizing Current limited Control purpose.Conducting and the shutoff of rear drive IGBT amplified, isolated in the output pulse of PWM controller 3 through driver 5,6.Driver 5,6 is also served as the overcurrent testing except amplification and buffer action, when overcurrent output fault took place, signal was to protected location 4, and protected location blocks controller 3, reaches the protection purpose.

Claims (1)

1, a kind of direct current industrial and mineral electric locomotive vehicle power, be to be composed in series major loop by two half-bridges, control circuit is made up of Voltage Feedback (1) current feedback (2) PWM controller (3) protective circuit (4) drive circuit (5), (6) part, it is characterized in that: a, main circuit are that C1, C2, C3, T1.1, IGBT1, IGBT2 organize a half-bridge; C4; C5; C6; T1.2; IGBT3; IGBT4 forms another half-bridge; two half-bridge series connection; the 1500v direct voltage is separated into two 750v direct voltages; b; the transformer of two half-bridges is two primary windings; on same transformer; the primary winding of each half-bridge provides the power output of half; promptly the magnetic line of force of two primary winding generations is in parallel on the magnetic circuit of transformer; on secondary coil T1.3, produce induced current jointly; power output is both sums; this circuit has guaranteed; the sharing of load symmetry of following two half-bridges; reached the balance of load; c; it is adjustable that transformer secondary coil T1.3 goes up positive and negative approximately its pulse duration of 50v electric pulse of induction; when the secondary load electric current is big; the adjustment pulse duration broadens; when electric current hour; the adjustment pulse duration narrows down; the adjustment of pulse duration is adjusted according to the signal of voltage feedback unit (1) and the signal magnitude of current feedback unit (2) automatically by PWM controller (3); reach voltage stabilizing Current limited Control purpose; the output pulse of PWM controller (3) is through driver (5); (6) amplify; isolate conducting and the shutoff of rear drive IGBT; driver (5); (6) except amplification and buffer action; also serve as the overcurrent testing; when overcurrent output fault takes place when; signal is to protected location (4); protected location blocks controller (3), reaches the protection purpose.

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