JPS5943679Y2 - Dental X-ray equipment power supply circuit - Google Patents

Description

[Detailed description of the invention] The present application relates to a power supply circuit for a dental X-ray machine aimed at reducing the weight and size of an X-ray head. At the same time, a first high-frequency oscillation amplifying circuit and a heater transformer are sequentially connected to the first high-frequency oscillation amplifying circuit, and a second gate circuit for adjusting tube voltage is connected to the switched commercial power supply through a delay circuit.
An AC/DC conversion circuit is connected, and a second high-frequency oscillation amplification circuit and a high-voltage transformer are connected to this in sequence, and the secondary coil of the heater transformer is connected to the heater of the X-ray tube, and the secondary coil of the high-voltage transformer is connected to the The secondary coils are connected between the heater and the anode of the X-ray tube, and the middle point of the secondary coils is grounded.

The embodiment will be described in detail below with reference to the drawings. Reference numeral 1 denotes a first AC/DC conversion circuit on the heater side connected to a commercial power source E, and a first high frequency oscillation amplification circuit 2 is connected to the load side of the heater through a smoothing capacitor Ca. This circuit 2 is equipped with a tube current control circuit 4.

Reference numeral 5 denotes a second AC/DC converter circuit on the anode side connected to the commercial power source E via a delay circuit 6, and a second high frequency oscillation amplification circuit 7 is connected to its load side via a smoothing capacitor Cb.

The AC/DC conversion circuit 5 is equipped with a gate circuit for adjusting tube voltage, and this gate circuit is adjusted by a gate signal from a gate signal generator 8.

9 is a heater transformer, and its secondary coil 9p is connected to the first
The secondary coil 9 is connected to the output side of the high frequency oscillation amplification circuit 2.
s are connected to the heaters of the X-ray tube 10, respectively.

Reference numeral 11 denotes a high-voltage transformer, whose secondary coil 11p is connected to the output side of the second high-frequency oscillation amplification circuit 7, and whose secondary coil 11.8 is connected between the heater and anode of the X-ray tube 10. The secondary coil 11s is divided into two at its midpoint, and this dividing point is connected to the tube current control circuit 4.
It is connected to ground via a tube current detection resistor R that controls the current.

As mentioned above, the present application uses a power supply unit built into the head of a dental X-ray machine to replace the method of directly applying a commercial frequency AC power source to a high voltage transformer for an X-ray tube, by applying a commercial frequency AC voltage once to a DC voltage. After converting to voltage, this is converted into a high frequency and applied to the heater transformer and high voltage transformer, respectively, and the tube voltage is adjusted using the gate signal, so the gate circuit can be integrated into an IC. ,
Overall, it is extremely effective in reducing the size and weight of the power supply unit, and is therefore very convenient because it can simplify the configuration of the drive mechanism of dental X-ray equipment, especially the X-ray equipment that takes tomographic images of dental arches. It is.

Furthermore, according to the present application, when the middle point of the secondary coil of the high voltage transformer is grounded and the X-ray generation voltage is 100 KV, for example, -50 KV is generated in one of the secondary coils of the high voltage transformer and +50 KV is generated in the other. I configured it so that
The insulating structure of the power supply section is easy, and a low-cost product can be provided.

Further, according to the present invention, since a delay circuit is provided, the anode is energized after the heater is sufficiently heated in the X-ray tube, and thus has the advantage that it can be used effectively.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the present application. E...Commercial power supply, 1,5...AC/DC conversion circuit, 2.7...High frequency oscillation amplification circuit, 4.
...Tube current control circuit, 6...Delay circuit,
8...Gate signal generator, 9...Heater transformer, 10...X-ray tube, 11...
・High voltage transformer, R...Tube current detection resistor.

Claims (1)

[Scope of utility model registration request] A first AC/DC converter circuit is connected to a commercial power source, and a first high frequency oscillation amplification circuit and a heater transformer are connected to this in sequence, and a gate circuit for adjusting tube voltage is connected to the commercial power source via a delay circuit. A second AC/DC converter circuit is connected thereto, and a second high-frequency oscillation amplification circuit and a high-voltage transformer are sequentially connected thereto, and the secondary coil of the heater transformer is connected to the heater of the X-ray tube, and the A power supply circuit for a dental X-ray device in which the secondary coils of a high-voltage transformer are connected between an X-ray tube zero heater and an anode, and the middle point of the secondary coils is grounded.