Abstract:
PROBLEM TO BE SOLVED: To provide an electric working machine in which rotation of a motor is safely controllable, independent from output of a battery, and batteries with various output is detachably usable. SOLUTION: The electric working machine is configured as follows. When a main switch 12 is turned ON, the electric operating machine 1 is put in the standby mode, and when a trigger 13 is pulled in the standby mode, a power supply circuit 16 applies a voltage to a driving part 30. The power supply circuit 16 adjusts the voltage applied to the driving part 30 for a voltage corresponding to the pulling rate of the trigger 13. When the current running toward the driving part 30 exceeds the rated value of the driving part 30, the power supply circuit 16 automatically stops power supply to the driving part 30. On the other hand, when the output voltage of a battery 50 drops and the battery 50 is put in an overdischarge state, power supply to the driving part 30 is automatically stopped. When it is detected that the battery 50 undergoes an abnormal event, power supply to the driving part 30 is automatically stopped. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a power conversion apparatus which reliably detects and protects a short circuit fault. SOLUTION: The power conversion apparatus 1 includes a three phase bridge-type power conversion circuit 2 constituted of a semiconductor switch 6 having a first main terminal, a second main terminal and a control terminal, a control circuit 3 controlling an operation of the semiconductor switch 6 and a voltage detecting circuit 4 monitoring voltage between DC terminals of the power conversion circuit 2. The control circuit 3 includes a protection function which turns off the semiconductor switch when a state where voltage between the DC terminals of the power conversion circuit 1, which the voltage detecting circuit 4 detects, is smaller than a prescribed value continues for not less than a prescribed time. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an auxiliary artificial heart pump drive unit having high availability without duplexing a pump device even when a serious fault occurs, and to provide an auxiliary artificial heart system. SOLUTION: The auxiliary artificial heart pump drive unit for driving an auxiliary artificial heart pump includes first and second pump control part having the duplexed configuration of respective control parts for output the driving signal of the auxiliary artificial heart pump and controlling the auxiliary artificial heart pump. The respective pump control parts include means for electrically interrupting a route to output the driving signal to the auxiliary artificial heart pump when the fault is detected inside the pump control parts. COPYRIGHT: (C)2010,JPO&INPIT