Gendex Oralix AC - Revision history

Reinis.veips: Added comment on verification of the driver circuit.

2020-08-04T10:52:25Z

Added comment on verification of the driver circuit.

Reinis.veips: Added information on ESP32 triac driver and tube warmup.

2020-07-21T16:30:21Z

Added information on ESP32 triac driver and tube warmup.

Mcmaster: Created page with "=== Gendex Oralix AC === ==== Description ==== Seems to be simply driven by switching AC 250V. [http://www.henryschein.be/be-fr/images/dental/GENDEX_Oralix_AC_LR_FR_0110.pdf..."

2019-03-09T06:50:26Z

Created page with "=== Gendex Oralix AC === ==== Description ==== Seems to be simply driven by switching AC 250V. [http://www.henryschein.be/be-fr/images/dental/GENDEX_Oralix_AC_LR_FR_0110.pdf..."

New page

=== Gendex Oralix AC ===

==== Description ====

Seems to be simply driven by switching AC 250V.
[http://www.henryschein.be/be-fr/images/dental/GENDEX_Oralix_AC_LR_FR_0110.pdf French PDF with brief presentation]

*Minimum time is basically 1.5 Period @ 50Hz
*Only 2 contact and Earth are available.
*(Everything handled internally by multiples coils on transformer ?)

* 65kV @ 7.5mA (sticker says 8.25mA)
* time: 30ms to 2.5s
* 230V 50/60Hz

[[File:nats_gendex_gendex_oralix_ac_gen_view.jpg|400 px]]

[[File:nats_gendex_gendex_oralix_ac_top_elec_view.jpg|400 px]]

[[File:nats_gendex_gendex_oralix_ext_contact.jpg|400 px]]

[[File:nats_gendex_gendex_oralix_ac_collimator.jpg|400 px]]

[[File:nats_gendex_gendex_oralix_powering_sticker.jpg|400 px]]

==== Driving ====
Project in progress:
* Certainly will use IXYS CPC1998

[[File:nats_misc_power_cpc1998.jpg|400 px]]

==== Accessories ====

I need a collimator, maybe will be done in steel + lead.

==== Measured Resistance ====
Resistor parallel to MOV is 4.7kR, when removed it becomes high impedance. Measure were made with disconnected Red and Black wires.

No contacts have link with the metal casing (ground).

[[File:nats_gendex_gendex_oralix_impedances.jpg|400 px]]

PCB Schematic:

[[File:nats_gendex_gendex_sch.png|400 px]]

Seems to be confirmed by the schematic of Oralix 65

[[File:nats_gendex_gendex_oralix_65.png|400 px]]

@@ Line 34: / Line 34: @@
 [[File:nats_misc_power_cpc1998.jpg|400 px]]
-=== ESP32 triac driver ===
+===ESP32 triac driver===
 [[File:Oralix AC65 driver.jpg|thumb]]
 Schematics for driver electronics and firmware for ESP32 can be found [https://github.com/festlv/oralix-ac65s-controller/ here]. The principle of operation is not that different from a light dimmer- optoisolator is used to detect when the mains voltage is at zero, at which point the triac is turned on for pre-determined exposure time. The firmware is written for 50Hz mains frequency- if adapting it for 60Hz tubes, a constant in source needs to be updated for cycle-accurate exposure control.
@@ Line 45: / Line 45: @@
 A dental equipment technician recommended to start firing the tube with several short exposure times if it has not been used for some time, which was also confirmed by [http://mpijournal.org/pdf/2018-01/MPI-2018-01-p157.pdf this paper].
-<br />
+<br />The driver circuit above was confirmed to be working on a dental X-Ray testing equipment which showed the exact X-Ray radiation waveform. The radiation was produced as half-period pulses (that is: a sinusoidal pulse with 10ms width, followed by 10ms off-time). According to the technician it was the expected waveform.
 ==Accessories==

@@ Line 1: / Line 1: @@
-=== Gendex Oralix AC ===
+==Description==
 Seems to be simply driven by switching AC 250V.
 [http://www.henryschein.be/be-fr/images/dental/GENDEX_Oralix_AC_LR_FR_0110.pdf French PDF with brief presentation]
-*Minimum time is basically 1.5 Period @ 50Hz
+*Minimum time is basically 1.5 Period @ 50Hz. [http://www.frankshospitalworkshop.com/equipment/documents/x-ray/service_manuals/Gendex%20Oralix%20AC%20Dental%20X-Ray%20-%20Service%20manual%20(en,es).pdf Service manual] explains that first 120ms (117ms for 60Hz tube) of exposure does not produce significant amount of X-rays and refers to this time as warmup time. Total tube-on time consists of these 120ms warmup time and 30ms to 2.5s of exposure time.
 *Only 2 contact and Earth are available.
 *(Everything handled internally by multiples coils on transformer ?)
-* 65kV @ 7.5mA (sticker says 8.25mA)
+*65kV @ 7.5mA (sticker says 8.25mA)
-* time: 30ms to 2.5s
+*Exposure time: 30ms to 2.5s
-* 230V 50/60Hz
+*230V 50/60Hz
 [[File:nats_gendex_gendex_oralix_ac_gen_view.jpg|400 px]]
@@ Line 24: / Line 27: @@
 [[File:nats_gendex_gendex_oralix_powering_sticker.jpg|400 px]]
-==== Driving ====
+==Driving==
 Project in progress:
 * Certainly will use IXYS CPC1998
 [[File:nats_misc_power_cpc1998.jpg|400 px]]
-==== Accessories ====
+=== ESP32 triac driver ===
 I need a collimator, maybe will be done in steel + lead.
-==== Measured Resistance ====
+Reinis: my tube is also missing a collimator, so any information on the geometry/construction of original collimator would be welcome.
-Resistor parallel to MOV is 4.7kR, when removed it becomes high impedance. Measure were made with disconnected Red and Black wires.
 No contacts have link with the metal casing (ground).