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5.加载电机控制电路该机的加载与卸载电机控制电路如图5所示。操作“CLOSE”钮时,由U4将操作信息送给微处理器U3,处理成加载指令,并通过I~2C总线传输给U1,使U1从(53)脚输出高电平(4.8 V),控制电压到驱动电路U20③脚;同时U3(14)脚输出低电平(0 V)到U20②脚。U20对该电压驱动放大后,从U20⑦脚输出0 V电压,⑧脚输出3.8 V电压,驱动加载电机正转,电机通过托盘进
5. Load motor control circuit The machine loading and unloading motor control circuit shown in Figure 5. When the “CLOSE” button is operated, the operation information is sent to the microprocessor U3 by the U4, processed into a load command, and transmitted to U1 through the I ~ 2C bus to make U1 output a high level (4.8 V ), The control voltage to the drive circuit U20 ③ feet; at the same time U3 (14) pin output low (0 V) to U20 ② feet. After U20 drives this voltage to amplify, 0 V voltage is output from U20 ⑦ pin, 3.8 V voltage is output from ⑧ pin, the load motor is driven forwardly and the motor passes through the tray