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245 Circuit design for electrohydraulic proportional ampli ?er 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 electrohydr

Circuit design for electrohydraulic proportional ampli ?er 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 ampli ?er was discussed along with the recent development of the ampli ?er and the control requirements 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 ampli ?er and detailed the circuit design for the ampli ?er The proposed design was then veri ?ed 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 ampli ?cateur proportionnel électrohydraulique Tout d ? abord le principe de contrôle de la modulation de largeur d ? impulsion MLI de l ? ampli ?cateur a été discuté ainsi que le développement récent de l ? ampli ?cateur et les exigences de contrôle de la valve directionnelle proportionnelle Ensuite un modèle mathématique a étéétabli pour le courant bobine de soléno? de proportionnelle Sur cette base l'auteur a analyséla méthode de commande de l'ampli ?cateur proportionnel électrohydraulique et a détailléla conception du circuit de l'ampli ?cateur La conception proposée a ensuite été véri ?ée par un test de contrôle et une simulation logicielle Les résultats du test concordent bien avec les données de simulation et montre que la conception du circuit est faisable et valide KEYWORDS pulse width modulation PWM proportional solenoid coil proportional ampli ?er simulation MOTS -CLÉS modulation de largeur d'impulsion MLI bobine de soléno? dale proportionnelle ampli ?cateur proportionnel simulation DOI EJEE - ? Lavoisier European Journal of Electrical Engineering ?? n - C EJEE Volume ?? no Introduction The proportional ampli ?er as an important element of the control system for the proportional solenoid valve serves to provide the proportional solenoid valve with speci ?c current so that the ow or pressure it outputs is proportionally controlled Canuto Acu? a-Bravo The proportional ampli ?er developed with the state-of-the-art has many defects such as complicated structure design unreasonable circuit board layout poor heat dissipation of electronic components inconvenient maintenance and potential risks Malaguti Pregnolato Wang et al In order to resolve the technology mismatches of the above proportional ampli ?er here comes a new type of proportional ampli ?er Functions of proportional ampli ?er After input control signal is processed and ampli ?ed the current signal is o ?ered to the proportional electromagnet to control the electromagnet movement the electromagnet drives the spool to move and acquire the feedback signal 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 ?nish the following functions proportional processing performed on di ?erent standard signals after amplifying it