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Development of electrical stimulation instrument of beef carcasses based on single-chip microcomputer MSP430

This paper reported an electrical stimulation instrument in order to meet the tenderizing requirements for different varieties and parts of the beef. Based on pulse-width modulation (PWM), this instrument has at its core single-chip microcomputer MSP430 and H-bridge with four MOSFET. By controlling the duty cycle of the PWM/SPWM (Sinusoidal PWM) produced by single-chip microcomputer, this instrument could realise the inversion of direct current by H-bridge, thus generating different wave forms. This paper introduced the functions, operation principles, hardware and software structure of the instrument. The results showed that: The instrument was able to produce 5 types of the waveforms, namely, DC, square wave, sine wave, triangular wave and sawtooth wave. The each parameters of electrical stimulation instrument were all adjustable. The peak voltage range of each waveform was 0∼110V and frequency adjustment range was 1∼450HZ. Finally the paper concludes with an experiment whose result shows that the output of electrical stimulation parameters could achieve the tenderizing requirements with its high precision, which has provided the technical support for the beef tenderizing processing.