摘要:
In order to prevent breakage of a power converter, a current which flows into an inverter (3) in the power converter is detected.The inverter (3) is equipped with two or more primary windings in parallel with each other.The current flowing through each of the primary windings is detected by current sensors (17, 6).A control unit (22) determines from the outputs of the current sensors that an abnormality occurs, when current does not flow through any of the primary windings.
摘要:
A power converter is configured to include an inverter which converts a DC output into an AC voltage of a predetermined frequency, and a high voltage generator which receives an output from output terminals of the inverter and boosts the output to a desired high DC voltage. The high voltage generator includes a transformer, and the primary windings of the transformer are connected to the output terminals of the inverter in parallel by conductive wires connected to both ends of each primary winding. Further, a current sensor is provided to detect a current flowing through each of the primary windings, and a control unit determines abnormalities of a path of the inverter and the primary windings on the basis of a value of the current sensor.
摘要:
There is provided an inverter device that can detect short-circuit of a switching element of an inverter circuit even under a load condition that a PWM driving signal is very small. The inverter device is provided with means for independently supplying a short-circuit detecting PWM driving signal to respective switching elements S1 to S4 at different timings before the inverter circuit 21 supplies a PWM driving signal for supplying power to a high voltage generating device 31, successively turning on the respective switching elements S1 to S4 with the short-circuit detecting PWM driving signal, detecting on-voltages of the switching elements S1 to S4 which are connected to the turned-on switching elements S1 to S4 in series, and detecting overcurrent or short-circuit states of the switching elements S1 to S4.
摘要:
There is provided an inverter device that can detect short-circuit of a switching element of an inverter circuit even under a load condition that a PWM driving signal is very small. The inverter device is provided with means for independently supplying a short-circuit detecting PWM driving signal to respective switching elements S1 to S4 at different timings before the inverter circuit 21 supplies a PWM driving signal for supplying power to a high voltage generating device 31, successively turning on the respective switching elements S1 to S4 with the short-circuit detecting PWM driving signal, detecting on-voltages of the switching elements S1 to S4 which are connected to the turned-on switching elements S1 to S4 in series, and detecting overcurrent or short-circuit states of the switching elements S1 to S4.
摘要:
A discharging part of an X-ray generator using a one-side earthed X-ray tube is earthed is identified on the basis of the tube voltage detected value and the tube current detected value. For the identification, the X-ray generator comprises a device comprising tube voltage decrease slope calculating means (S4), tube current increase calculating means (S4), first judging means (S5) for judging whether or not the slope of the tube voltage decrease exceeds its acceptable value, second judging means (S6) for judging whether or not the increase of the tube current exceeds its acceptable value, and discharge portion identifying means (S7, S8) for identifying the discharging part which is in the X-ray tube or a high-voltage generating unit on the basis of the results of the judgments made by the first and second judging means. The identified discharging part is displayed on display means (S9).
摘要:
A discharging part of an X-ray generator using a one-side earthed X-ray tube, i.e., the anode or cathode is earthed is identified on the basis of the tube voltage detected value and the tube current detected value. For the identification, the X-ray generator comprises a device comprising tube voltage decrease slope calculating means (S4) for calculating the slope of decrease with time of the tube voltage detected value, tube current increase calculating means (S4) for calculating the increase of the tube current detected value in a predetermined time, first judging means (S5) for judging whether or not the slope of the tube voltage decrease calculated in the tube voltage decrease slope calculating means exceeds its acceptable value, second judging means (S6) for judging whether or not the increase of the tube current calculated in the tube current increase calculating means exceeds its acceptable value, and discharge portion identifying means (S7, S8) for identifying the discharging part which is in the X-ray tube or a high-voltage generating unit on the basis of the results of the judgments made by the first and second judging means. The identified discharging part is displayed on display means (S9).Therefore, provided is a small-sized high-reliable X-ray generator having a function of identifying a discharging part with high accuracy.