Mobile X-ray apparatus
A mobile X-ray apparatus includes: an X-ray radiation device configured to emit X-rays; a controller configured to control the X-ray radiation device; a power supply configured to supply operating power to the X-ray radiation device and the controller from a lithium ion battery and control overcurrent that occurs during emission of the X-rays by the X-ray radiation device; and a charger configured to charge the power supply.
1. A mobile X-ray apparatus comprising:
an X-ray radiation device configured to emit X-rays;
a controller configured to control the X-ray radiation device; and
a power supply comprising:
a lithium ion battery,
a discharge field effect transistor (FET) configured to be connected to the lithium ion battery to supply operating power to the X-ray radiation device and the controller,
a first current sensor connected in series to the discharge FET and the lithium ion battery and configured to detect an overcurrent that occurs during an emission of the X-rays, and
a battery management system (BMS) configured to detect an occurrence of an overcurrent in the lithium ion battery via the first current sensor, and to control an overcurrent; and
a charger configured to charge the lithium ion battery,
wherein the BMS is configured to detect an occurrence of an overcurrent via the first current sensor in response to receiving an X-ray emission preparation signal.
2. The mobile X-ray apparatus of claim 1 , wherein
the discharge FET includes a plurality of FETs connected in parallel to one another, and
the power supply further comprises a charge FET configured to be connected to the lithium ion battery to charge the lithium ion battery from the charger.
3. The mobile X-ray apparatus of claim 2 , wherein the discharge FET and the charge FET are configured to control a path of a discharge current or a charge current when the lithium ion battery is discharged or charged, respectively.
4. The mobile X-ray apparatus of claim 2 , wherein the BMS is configured to detect a state of the power supply, and to control a charge path by turning off the discharge FET and turning on the charge FET, and control a discharge path by turning on the discharge FET and turning off the charge FET.
5. The mobile X-ray apparatus of claim 1 , wherein the BMS is configured to detect a state of the power supply, and to control an operation of a protection circuit for protection against at least one among an over-discharge, an overcurrent, an overheating, and an unbalance between at least two cells included in the lithium ion battery.
6. The mobile X-ray apparatus of claim 1 , wherein the first current sensor is configured to detect a first current of a relatively large value.
7. The mobile X-ray apparatus of claim 6 , wherein the power supply further comprises a second current sensor configured to detect a second current of a relatively small value and connected in series to the first current sensor and the lithium ion battery, and
the BMS is configured to detect an occurrence of an overcurrent via the first current sensor and to detect a current flowing in the lithium ion battery after a completion of the emission of the X-rays via the second current sensor.
8. The mobile X-ray apparatus of claim 1 , further comprising a charge current sensor which is located at an output terminal of the charger and is configured to detect a charge current.
9. The mobile X-ray apparatus of claim 8 , wherein the charger is further configured to stop charging the lithium ion battery when the detected charge current remains less than a certain current value for a certain amount of time.
10. The mobile X-ray apparatus of claim 9 , wherein the charger is further configured to restart the charging the lithium ion battery when a voltage of the lithium ion battery is lower than a certain voltage value.
11. The mobile X-ray apparatus of claim 1 , wherein each of the controller, the power supply, and the charger is embodied in a different module.
12. The mobile X-ray apparatus of claim 1 , wherein the controller, the power supply, and the charger respectively comprise communication interfaces, and
the controller, the power supply, and the charger communicate with one another via the respective communication interfaces according to a controller area network (CAN) protocol.
13. The mobile X-ray apparatus of claim 1 , wherein the power supply comprises a temperature sensor configured to detect a temperature within the power supply, and
the controller is further configured to directly monitor information about the temperature detected by the temperature sensor.
14. The mobile X-ray apparatus of claim 1 , wherein the power supply and the charger comprise respective interrupt pins that are directly controlled by the controller, and
the controller is further configured to turn off the power supply and the charger via the respective interrupt pins.
15. The mobile X-ray apparatus of claim 1 , wherein the charger comprises a wireless charging system including a transmitter and a receiver.
16. The mobile X-ray apparatus of claim 1 , wherein the charger is further configured to receive power wirelessly from an external device and charge the lithium ion battery based on the received power.