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245 European Journal of Electrical Engineering ?? n - Circuit design for electrohydraulic proportional ampli fier Yongchun Hou School of Electronic and Electrical Engineering Baoji University of Arts and Sciences Baoji China hyc com ABSTRACT This paper at

European Journal of Electrical Engineering ?? n - Circuit design for electrohydraulic proportional ampli fier Yongchun Hou School of Electronic and Electrical Engineering Baoji University of Arts and Sciences Baoji China hyc com ABSTRACT This paper attempts to design a stuiable circuit for electrohydraulic proportional amplifer Firstly the pulse width modulation PWM control principle of the amplifier was discussed along with the recent development of the amplifier and the control requ irements of proportional direction valve Then a mathematical model was established for the proportional solenoid coil current On this basis the author analyzed the control method of electrohydraulic proportional amplifier and detailed the circuit desi gn for the amplifier The proposed design was the n verified through a control test and software simulation The test results agree well with the simulation data indicating that the circuit design is feasible and valid RÉSUMÉ Cet article tente de concevoir un circuit modulable pour amplificateur propor tionnel électrohydraulique Tout d ? abord le principe de contrôle de la modulation de largeur d ? impulsion MLI de l ? amplificateur a été discuté ainsi que le développement récent de l ? amplificateur et les exigences de contrôle de la valve directionnelle pr oportionnelle Ensuite un modèle mathématique a été établi pour le courant bobine de soléno? de proportionnelle Sur cette base l'auteur a analysé la méthode de commande de l'amp lificateur proportionnel électrohydraulique et a détaillé la conception du ci rcuit de l'amplificateur La conception proposée a ensuite été vérifiée par un test de contrôle et une simulation logicielle Les résultats du test concordent bien avec les donnée s de simulation et montre que la conception du circuit est faisable et valide KEYWORDS pulse width modulation PWM proport ional solenoid coil proportional amplifier simulation MOTS -CLÉS modulation de largeur d'impulsion MLI bobine de soléno? d ale proportionnelle amplificateur proportionnel simulation DOI EJEE - ? Lavoisier EJEE Volume ?? no Introduction The proportional amplifier as an important element of the control system for the proportional solen oid valve serves t o provide the proportional solenoid valve with specific current so that the flow or pressure i t ou tputs is proportionally controlled Canuto Acu? a -Bravo The proportional amplifier developed with the state -of-the -art has many defects such as complicat ed structure desig n unreasonable circuit board layout poor heat dissipation of electroni c co mponents inconvenient maintenance and potential risks Malaguti Pregnolato Wang et al In order to resolve the technology mismatches of the above proportional amplifier here comes a new type of propo rtional amplifier Functions o f pr oportional amplifier After input control signal is processed and amplified the current signal is offered to the proportional electromagnet to control the electromagnet movement the electromagnet driv es the spool to mo ve and acquire the feedback sig nal of the displacement sensor to form a closed loop control on the electro -hydraulic proportional valve The input interface and the signal processing module work together to finish the following functio ns proportiona