| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable output charger in which a charging voltage control mode and a charging current control mode can be switched smoothly.SOLUTION: The variable output charger includes a high frequency transformer, a control unit for generating a percentage modulation signal, a carrier signal generation unit, a PWM signal generation unit, a frequency conversion unit having a plurality of switches for applying an AC pulse of higher frequency than that of a three-phase AC power supply across the primary winding, and a rectification unit for producing a DC power by rectifying the AC component generated across the secondary winding of the high frequency transformer. The control unit includes a voltage regulation unit for generating a charging current target value depending on the comparison result of a charging voltage measurement value being applied to a battery and a target value, a variable limiter for limiting the charging current target value within a variable upper limit value, a current regulation unit for generating the output voltage target value of the rectification unit depending on the comparison result of the charging current target value and the charging current measurement value, and an amplification value generation unit for generating the amplification value of a percentage modulation signal by multiplying the output voltage target value of the rectification unit by a predetermined coefficient. |
