| 摘要 |
The utility model provides a laser power supply device. To the change of a load or the change of alternating current power supply voltage, the device prevents abnormal increase of charging current (generation of inrush current) in advance so as to improve security and reliability. A monitoring circuit (70) comprises a voltage detection line (72) and an isolation amplifier (74) which are used for detecting voltage drop VLR of a coil (26) and a resistor (28) or voltage drop VLS of the coil (26) and a second interrupter (30) in a charging circuit (14), a monitoring value generation circuit (76) of two monitoring values MVM1 and MVM2 used for stopping and charging completion in an abnormal situation, a switch (78) used for selecting one of the monitoring values MVM1 and MVM2, and a comparator (80) used for comparing a coil voltage drop detected value MVLR (MVLS); from the isolation amplifier (74) with the monitoring values MVM1 and MVM2. A controller (20) controls the connection and disconnection of a first interrupter (24) and the second interrupter (30) according to an output signal (a comparison result signal) of the comparator (80). |
