DIGITAL SYSTEM CONSTANT-CURRENT CONTROL CIRCUIT

摘要: PROBLEM TO BE SOLVED: To obtain a low-cost digital constant-current control circuit with further improved characteristics and simple configuration. SOLUTION: The system is composed of subtraction 3 for current deviation where an instruction voltage value given from upper-level controller 1, integrator 4 integrating result digitally, actuator drive 6 driving the pickup based on output 4, detection amplifier detecting amplification, A/D converter 11 converting analog to inputting it deviation, gain switching judgment equipment 10-4 according in track-following servo, or jump seek status servo off, 5 integrator, 2 input range deviation.