CN2870289Y - Inverter - Google Patents

Abstract

The utility model relates to the reverse power supply used by the rail car comprising a main circuit and control circuit; the main circuit is comprised of a DC/DC and DC/AC, the DC/DC part is medium-power push-pull switching circuit, and the DC/AC is comprised of an unidirectional reverse bridge and electromagnetic compatibility filter; the control circuit is comprised of a trans-vector control circuit of DC/DC and control circuit of DC/AC, and the trans-vector control circuit of DC/DC comprises a filter, push-pull circuit, switching transformer and main control chip, the main control chip is connected with the filter, push-pull circuit and switching circuit independently; DC/AC control part comprises a unidirectional reverse bridge, LC filtering, electromagnetic compatibility filter, main control chip and CPLD, the output head of the unidirectional reverse bridge is connected with the input head of LC filtering, the output head of LC filtering is connected with the input head of the electromagnetic compatibility filter, the main control chip and CPLD are independently connected with the output heads of the unidirectional reverse bridge and electromagnetic compatibility filter, the main control chip and CPLD are also connected with the input head of DC/DC to achieve the technical requirements in locomotive industry.

Description

Inverter

Technical field

The utility model relates to a kind of inverter, the inverter that uses on particularly a kind of rail vehicle.

Background technology

At present, instrument on the market, instrument all is to exchange 50Hz with instrument basically, the power supply of 220V, and existing Domestic Electric locomotive provides the accessory power supply of direct current 110V can only for driver and maintainer, the maintenance workload of locomotive time section after executing transport task is more, numerous maintenance personals frequently go up locomotive work, owing to lack the alternating current 220V power supply, inconvenience is arranged more, being equipped with the alternating current 220V power supply to locomotive is numerous maintenance personals and driver and conductor's common voice, and single-phase inversion power supply in the market lacks the power supply that uses under the locomotive environmental condition, show that mainly input voltage is not inconsistent, the narrow range of input voltage, working temperature, reliability, resistance to vibration does not reach the operation technique requirement of locomotive electric apparatus.It is customized that this has just caused instrument, instrument and instrument to arrive producer, not only increased the purchase cost of enterprise, brought great inconvenience also for driver and maintainer.Inverter on the existing market mostly is input direct current 12V, 24V, 48V, output AC 220V quasi-sine-wave, and efficient is low, and environment for use requires high, the operation technique requirement that does not at all reach the railway locomotive industry.

Summary of the invention

The purpose of this utility model just provides a kind of inverter of use of railway locomotive industry.

The technical solution of the utility model realizes by following approach.The utility model is made up of main circuit and control circuit, wherein, main circuit is made up of DC/DC and DC/AC two parts, and wherein DC/DC partly is the push-pull type switching power circuit of middle power, and H type half-bridge converter that DC/AC part is made up of field effect transistor and LC form the electromagnetic compatibility filter and form; Control circuit also is made up of DC/DC conversion control and DC/AC control circuit two parts, wherein, DC/DC conversion control section contains filter, push-pull circuit, switch transformer and main control chip, and main control chip links to each other with filter, push-pull circuit, switch transformer respectively; The DC/AC control circuit partly comprises H type half-bridge converter, LC filtering, electromagnetic compatibility filter, main control chip and CPLD, wherein the output of H type half-bridge converter is connected with the input of LC filtering, the output of LC filtering is connected with the input of electromagnetic compatibility filter, main control chip is connected with the output of electromagnetic compatibility filter with H type half-bridge converter respectively with CPLD and is connected, simultaneously, main control chip also is connected with the input of DC/DC with CPLD.

The utility model is a kind of brand-new power supply change-over device, and it utilizes the high frequency chopping principle direct current of 110V can be converted DC-AC-DC-AC to 220V, 50Hz alternating current, is mainly used in rail vehicle inverter field.It not only has, and the Switching Power Supply volume is little, in light weight, power big, the efficient advantages of higher; and have safeguard measures such as overload that common inverter lacks, overvoltage, under-voltage output short-circuit; and saved heavy iron-core transformer, can reach the operation technique requirement of railway locomotive industry fully.But also have following characteristics, 1, to have the environment for use temperature wide, at-40 ℃--between-+70 ℃.2, wide input voltage range all can reliably working between 77V---135V.3, pure sine wave output, waveform distortion factor is less than 3%.4, overload capacity amount, instantaneous shock load can reach 5000W, ten times of volume loads.5, protection is complete, and input has overvoltage/undervoltage protection, overcurrent protection; Output has overload protection, the heating overheat protector.6, the inverter resistance to vibration meets locomotive IEC-61373.EMC test meets En50121-3-2:200.

Description of drawings

Fig. 1 is the DC/DC circuit diagram of main circuit

Fig. 2 is the DC/AC circuit diagram of main circuit

Fig. 3 is the DC/DC conversion control circuit block diagram of control circuit

Fig. 4 is the DC/AC control circuit block diagram of control circuit

Fig. 5 is the utility model operation principle block diagram

Embodiment

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing

The utility model is made up of main circuit and control circuit, wherein, main circuit is made up of DC/DC and DC/AC two parts, DC/DC partly is the push-pull type switching power circuit (as shown in Figure 1) of middle power, wherein V1, V2 are the field effect transistor switch pipe, and T is the boost switching transformer, and D1, D2, D3, D4 form the rectifier bridge of switch transformer output, the DC/DC conversion isolates DC110V and AC230V through switch transformer on electric, for the electrical equipment that uses on the locomotive provides a safety guarantee.H type half-bridge converter that DC/AC part (as shown in Figure 2) is made up of field effect transistor VT1-VT3 and LC form the electromagnetic compatibility filter and form, the electromagnetic compatibility filter is to suppress the outer measure of disturbing of DC/AC transfer pair, half-bridge converter converts the DC400V electricity to positive and negative two series impulses row, and filtering just forms continuous sine wave through LC.Control circuit also is made up of DC/DC conversion control and DC/AC control circuit two parts, wherein, DC/DC conversion control section (as shown in Figure 3) contains filter, push-pull circuit, switch transformer and main control chip, main control chip respectively with filter, push-pull circuit, switch transformer links to each other, main control chip adopts the integrated pulse modulator SG1525 of outstanding Switching Power Supply monolithic produced in USA, it has under-voltage locking, soft starting circuit, can the pulse width modulation controlled single-ended forward type, inverse-excitation type switch power-supply, push-pull type and semi-bridge switching voltage regulator, the switch operating frequency can rise to more than the 200KHZ from 20KHZ, DC/DC conversion, the operating frequency of Switching Power Supply are 180KHZ.It adopts closed-loop control, no matter how load changes, closes intermediate voltage beginning that to be controlled at 400V constant.The Control Parameter that its PID regulates is less; controlling reaction time is in the microsecond level; its input and output voltage of sampling; the pulse current of switching tube is as under-voltage protection; the overcurrent protection, the feedback signal of constant voltage control, simultaneously; its startup is controlled by the microcomputer output signal with closing, and its fault-signal is also exported to the microcomputer chip of back level DC/AC.The DC/AC control circuit is the control core with C8051F310, cooperates CPLD to finish control and the protection of DC/AC, and simultaneously, C8051F310 also carries out the management function to the DC/DC conversion.It comprises H type half-bridge converter, LC filtering, electromagnetic compatibility filter, main control chip and CPLD, wherein the output of H type half-bridge converter is connected with the input of LC filtering, the output of LC filtering is connected with the input of electromagnetic compatibility filter, main control chip is connected with the output of electromagnetic compatibility filter with H type half-bridge converter respectively with CPLD and is connected, simultaneously, main control chip also is connected with the input of DC/DC with CPLD.The C8051F310 single-chip microcomputer is a kind of of the C8051 series monolithic produced of U.S. Cynal company, it is fully integrated mixed signal SOC single-chip microcomputer, its main feature has: 25MIPS high-speed flow line formula 8051 microcontroller kernels, at the non-insertion debugging interface of system's full speed, at system programmable, 11 passage 200SPSADC, high-precision programmable 24.5MHZ sheet internal oscillator, 16KB is at system programmable Flash program storage, the 1KB ram in slice, the UART serial line interface of SMBua/I2C and enhancement mode independently separately, 43 16 general purpose timers have WatchDog Timer in the sheet, the VDD monitor, that CPLD adopts is the ispmach4064 of Lattic company, 40 I/O mouths, and 64 macrocells are at system programmable.As Fig. 5; C8051F310 gathers the AC output voltage; the control H of arteries and veins portion type inverter bridge through PI computing and the corrected Calculation of tabling look-up output SPWM modulation; CPLD distributes arteries and veins; even and protection C8051 is out of order and can not damages H type inverter bridge main circuit; that the temperature detection of radiator adopts is digital temperature sensor Tc77, and 90 ℃ is temperature threshold value, and whole inverter will quit work.In order to guarantee the rapidity of DC/AC control, C8051 adopts the assembler language programming, and CPLD adopts schematic diagram and VHDL language hybrid programming.

Fig. 5 is the inverter theory diagram, as shown in Figure 5, enter the DC/DC conversion after the DC110V process LC filtering and boost to constant 400V, again after intermediate capacitance filtering, input as H type inverter bridge enters DC/AC, transformation becomes SPWM modulating pulse row, and through forming the alternating current output of pure sinusoid after the ACLC filtering, whole single-phase inverter is divided into main circuit and control circuit two parts on circuit structure again.

Claims (2)

1. inverter, it is characterized in that it is made up of main circuit and control circuit, wherein, main circuit is made up of DC/DC and DC/AC two parts, wherein DC/DC partly is the push-pull type switching power circuit of middle power, and H type half-bridge converter that DC/AC part is made up of field effect transistor and LC form the electromagnetic compatibility filter and form; Control circuit is made up of DC/DC conversion control and DC/AC control circuit two parts, wherein, DC/DC conversion control section contains filter, push-pull circuit, switch transformer and main control chip, and main control chip links to each other with filter, push-pull circuit, switch transformer respectively; The DC/AC control circuit partly comprises H type half-bridge converter, LC filtering, electromagnetic compatibility filter, main control chip and CPLD, wherein the output of H type half-bridge converter is connected with the input of LC filtering, the output of LC filtering is connected with the input of electromagnetic compatibility filter, main control chip is connected with the output of electromagnetic compatibility filter with H type half-bridge converter respectively with CPLD and is connected, simultaneously, main control chip also is connected with the input of DC/DC with CPLD.

2, a kind of inverter according to claim 1 is characterized in that the main control chip of control circuit DC/DC conversion control section adopts SG1525, and the main control chip of DC/AC control circuit adopts C8051F310.

Images