CN201340775Y

CN201340775Y - Slide prevention valve driving device based on PWM control

Info

Publication number: CN201340775Y
Application number: CNU200820237512XU
Authority: CN
Inventors: 刘寅虎; 江崇民; 袁伟; 王爱武
Original assignee: CSR Nanjing Puzhen Co Ltd
Current assignee: CRRC Nanjing Puzhen Co Ltd
Priority date: 2008-12-29
Filing date: 2008-12-29
Publication date: 2009-11-04
Anticipated expiration: 2018-12-29

Abstract

A slide prevention valve driving device based on P W M control comprises an exhaust valve drive circuit and a pressure-retaining valve drive circuit which are respectively connected with an exhaust valve and a pressure-retaining valve, and a F P G A chip, wherein the F P G A chip is provided with two P W M signal input ends which are respectively connected with two P W M signal output ends of an anti-skid unit control main board D S P chip, wherein the exhaust signal output end of the F P G A chip is connected with the exhaust valve drive circuit, and the pressure-retaining signal output end of the F P G A chip is connected with the pressure-retaining valve drive circuit. The slide prevention valve driving device improves the starting speed of a slide prevention valve through increasing the starting voltage of the slide prevention valve, thereby improving the anti-skid efficiency of a railway vehicle anti-skid unit. The working voltage of the slide prevention valve is reduced after starting the slide prevention valve for one second, thereby reducing the drive power of the slide prevention valve, lessening the heating amount of the coil of the slide prevention valve, and prolonging the service life of the slide prevention valve. The P W M impulse width can be regulated in real time along with the fluctuation of the power supply of the slide prevention valve, which enables the working voltage of the slide prevention valve to be kept in 35V or 10V, improves the working reliability of the slide prevention valve, and prolongs the service life of the slide prevention valve.

Description

Antiskid valve drive unit based on PWM control

Technical field

The utility model relates to a kind of antiskid valve drive unit based on PWM control, belongs to rail vehicle non-skid valve Driving technique field.

Background technology

At present, the rated operational voltage of antiskid valve is DC24V on the rail vehicle, generally adopts constant DC24V stabilized voltage power supply to carry out drive controlling.Therefore, the opening speed of antiskid valve is subjected to the restriction of constant voltage and can't further improves on the one hand, and it is excessive to cause the antiskid valve opening speed to postpone; On the other hand, antiskid valve unlatching back not only needs a powerful power module if continue to keep DC24V voltage, and the long-time conducting of antiskid valve also can cause the increase of coil heating amount, the useful life of reduction antiskid valve.

Summary of the invention

Technical problem to be solved in the utility model is, overcome the shortcoming that the coil heating amount that the antiskid valve opening speed can't improve and long-time constant voltage power supply station causes that existing antiskid valve constant voltage drive controlling causes increases, a kind of antiskid valve drive unit based on PWM control is provided, it can improve the opening speed of antiskid valve, improve anti-skidding efficient, can also effectively reduce the antiskid valve caloric value, improve the useful life of valve.

The technical scheme that its technical problem that solves the utility model adopts is as follows: based on the antiskid valve drive unit of PWM control, its composition comprises respectively and exhaust valve, the exhaust valve drive circuit that pressure retaining valve connects, the pressure retaining valve drive circuit, it is characterized in that also including fpga chip, described fpga chip has two pwm signal inputs, be connected with two pwm signal outputs of anti-skid device control main board dsp chip respectively, the air draft signal output part of described fpga chip is connected with the exhaust valve drive circuit, and the pressurize signal output part of fpga chip is connected with the pressure retaining valve drive circuit.

Operation principle of the present utility model and process are as follows: by the pwm signal of anti-skid device control main board dsp chip output 5V, the pwm signal of output 110V drives antiskid valve after the PWM drive circuit amplifies, because antiskid valve is an inductive load, has filter action, what import antiskid valve is the PWM voltage signal of 110V, but the electric current of the antiskid valve of flowing through is a direct current stably, regulates the duty ratio of PWM, i.e. the effective value of voltage on the scalable antiskid valve.When antiskid valve was opened, the pwm signal that output duty cycle is bigger made that voltage effective value is 35V on the antiskid valve, to improve the opening speed of antiskid valve; After the unlatching, when antiskid valve service time surpasses 1 second, export little duty ratio pwm signal, make on the antiskid valve voltage effective value reduce to 10V,, improve the life-span of valve to reduce the coil heating amount.

The beneficial effects of the utility model are as follows: (1) has improved the opening speed of antiskid valve by increasing the antiskid valve cut-in voltage, thereby has improved the anti-skidding efficient of rail vehicle non-skid device; (2) antiskid valve is opened after 1 second and is promptly reduced the antiskid valve operating voltage, and the driving power of antiskid valve is reduced, and has reduced the caloric value of antiskid valve coil, the useful life of having improved antiskid valve; (3) along with the wave energy of anti-skidding power supply is adjusted the PWM pulsewidth in real time, make antiskid valve operating voltage all-the-time stable at 35V or 10V, improved the reliability of antiskid valve work, prolonged the useful life of antiskid valve.

Description of drawings

Fig. 1 is the antiskid valve drive unit circuit theory diagrams of the utility model based on PWM control.

Embodiment

With reference to the accompanying drawings and in conjunction with example the utility model is described in further detail.But the utility model is not limited to given example.

As shown in Figure 1, the present invention is based on the antiskid valve drive unit of PWM control, its composition comprises respectively and exhaust valve HV1, HV2, HV3, HV4, pressure retaining valve RV1, RV2, RV3, the exhaust valve drive circuit DH1 that RV4 connects, DH2, DH3, DH4, pressure retaining valve drive circuit DR1, DR2, DR3, DR4, its improvements are also to include fpga chip, this fpga chip has two pwm signal input P3, P4, respectively with two pwm signal output P1 of anti-skid device control main board dsp chip, P2 connects, the air draft signal output part D1 of this fpga chip, D3, D5, D7 and exhaust valve drive circuit DH1, DH2, DH3, DH4 connects, the pressurize signal output part D2 of fpga chip, D4, D6, D8 and pressure retaining valve drive circuit DR1, DR2, DR3, DR4 connects.As shown in Figure 1, in the present embodiment, have four exhaust valve HV1, HV2, HV3, HV4 and pressure retaining valve RV1, RV2, RV3, RV4.

The DPS chip is by two bigger less pwm signals of pwm signal, duty ratio of port P1, P2 difference output duty cycle, and selectively export corresponding pwm signal to exhaust valve drive circuit, pressure retaining valve drive circuit by fpga chip, realize function of the present invention.

In Fig. 1, digital signal processor DSP is the CPU processor of anti-skidding control board, and model is selected the TMS320F2812 of TI company for use, sends two-way pulsewidth adjustable pwm signal PWM1 and PWM2 by its task manager module EVA, and frequency setting is 20kHz.PWM1 is a broad pulse, and the voltage after being applied on the antiskid valve is DC35V; PWM2 is a burst pulse, and the voltage after being applied on the antiskid valve is DC10V.The pulsewidth of PWM1 and PWM2 is adjustable, and DSP gathers the magnitude of voltage of antiskid valve power supply in real time, adjusts output PWM pulsewidth in real time according to the fluctuation situation of supply voltage, guarantees that voltage keeps stable on the antiskid valve.Each car comprises 4 axletrees, and the anti-skidding prosecutor formula that is controlled to be of train is installed an antiskid valve on each axletree, and each antiskid valve comprises an exhaust valve and a pressure retaining valve, so need 8 road pwm control signals altogether.FPGA is a field programmable logic device, selects the SpartanIIS150 of Xilinx company for use, and the PWM1 (wide pulse width) and the PWM2 (narrow pulsewidth) of DSP output export 8 road pwm signals after the fpga logic conversion, respectively corresponding exhaust valve 1～4 and pressure retaining valve 1～4.Every road pwm signal all can switch between PWM1 or two kinds of signals of PWM2, and the pwm signal that switches to any pulsewidth is realized by DSP control FPGA.8 road pwm signals drive corresponding antiskid valve respectively again through the antiskid valve drive circuit, and promptly exhaust valve 1～4, pressure retaining valve 1～4.

Claims

1, the antiskid valve drive unit of controlling based on PWM, its composition comprises exhaust valve drive circuit, the pressure retaining valve drive circuit that is connected with exhaust valve, pressure retaining valve respectively, it is characterized in that also including fpga chip, described fpga chip has two pwm signal inputs, be connected with two pwm signal outputs of anti-skid device control main board dsp chip respectively, the air draft signal output part of described fpga chip is connected with the exhaust valve drive circuit, and the pressurize signal output part of fpga chip is connected with the pressure retaining valve drive circuit.

2, the antiskid valve drive unit based on PWM control according to claim 1 is characterized in that having four exhaust valve drive circuits and pressure retaining valve drive circuit.