An LED tube lamp comprises an LED module for emitting light; a rectifying circuit for rectifying an input external driving signal to produce a rectified signal; and a ballast interface circuit coupled to the LED module and comprising a detection circuit configured to determine that the external driving signal is a high frequency or high voltage signal when the voltage level of the rectified signal is higher than a predefined first threshold level. The ballast interface circuit causes an open circuit for the LED module when the voltage level of the rectified signal is higher than a predefined second threshold level but lower than the predefined first threshold level. And the ballast interface circuit causes current conduction in the LED module when the voltage level of the rectified signal, as based on an external driving signal from an inductive ballast, is lower than the predefined second threshold level.

An LED tube lamp comprises an LED module for emitting light; a rectifying circuit for rectifying an input external driving signal to produce a rectified signal; and a ballast interface circuit coupled to the LED module and comprising a detection circuit configured to determine that the external driving signal is a high frequency or high voltage signal when the voltage level of the rectified signal is higher than a predefined first threshold level. The ballast interface circuit causes an open circuit for the LED module when the voltage level of the rectified signal is higher than a predefined second threshold level but lower than the predefined first threshold level. And the ballast interface circuit causes current conduction in the LED module when the voltage level of the rectified signal, as based on an external driving signal from an inductive ballast, is lower than the predefined second threshold level.

A reflow oven central monitoring method includes setting standard operating parameters of a reflow oven, acquiring real-time operating parameters of the reflow oven, and comparing the real-time operating parameters respectively to the standard operating parameters to determine whether a difference exceeds a predetermined range. If the difference exceeds the predetermined range, workpieces are stopped from flowing into the reflow oven, a position of abnormal workpieces is locked, an alarm signal is sent, a prompt of locking the position of the abnormal workpieces is sent, and at least one of the real-time operating parameters is provided for inspection of the abnormal workpieces. The standard operating parameters include a standard temperature of each reheating zone of the reflow oven, a conveying speed of the reflow oven, and an oxygen content. The real-time operating parameters respectively correspond to the standard operating parameters.

A joining device for producing an exhaust gas system for an internal combustion engine comprises a device base, a frame, and at least two joining units that can be operated simultaneously are fastened to the frame. The frame extends essentially vertically starting from the device base. In a method for producing the exhaust gas system, at least one joining unit of a joining device is oriented to a geometry of the exhaust gas system that is to be produced, at least three components or assemblies of the exhaust gas system are positioned in the joining device, and the components or assemblies are simultaneously connected.

A light emitting diode (LED) tube lamp configured to receive an external driving signal includes an LED module for emitting light, the LED module comprising an LED unit comprising an LED; a rectifying circuit for rectifying the external driving signal to produce a rectified signal, the rectifying circuit having a first output terminal and a second output terminal for outputting the rectified signal; a filtering circuit connected to the LED module, and configured to provide a filtered signal for the LED unit; and a protection circuit for providing protection for the LED tube lamp. The protection circuit includes a voltage divider comprising two elements connected in series between the first and second output terminals of the rectifying circuit, for producing a signal at a connection node between the two elements; and a control circuit coupled to the connection node between the two elements, for receiving, and detecting a state of, the signal at the connection node. The control circuit includes or is coupled to a switching circuit coupled to the rectifying circuit, and the switching circuit is configured to be triggered on or off by the detected state, upon the external driving signal being input to the LED tube lamp, to allow discontinuous current to flow through the LED unit.

A light emitting diode (LED) tube lamp configured to receive an external driving signal includes an LED module for emitting light, the LED module comprising an LED unit comprising an LED; a rectifying circuit for rectifying the external driving signal to produce a rectified signal, the rectifying circuit having a first output terminal and a second output terminal for outputting the rectified signal; a filtering circuit connected to the LED module, and configured to provide a filtered signal for the LED unit; and a protection circuit for providing protection for the LED tube lamp. The protection circuit includes a voltage divider comprising two elements connected in series between the first and second output terminals of the rectifying circuit, for producing a signal at a connection node between the two elements; and a control circuit coupled to the connection node between the two elements, for receiving, and detecting a state of, the signal at the connection node. The control circuit includes or is coupled to a switching circuit coupled to the rectifying circuit, and the switching circuit is configured to be triggered on or off by the detected state, upon the external driving signal being input to the LED tube lamp, to allow discontinuous current to flow through the LED unit.

The present disclosure relates to a method for producing a final metal part for a nacelle of a turbojet. The method includes brazing at least two parts, one being an inner part having an inner surface and the other being an outer part having an outer surface. The method further includes a step of heating the outer surface of the outer part using an external heating means, and a step of heating the inner surface of the inner part using an internal heating means.

An LED tube lamp comprises a glass tube, two end caps coupled to a respective end of the glass tube, an LED light strip attached to an inner circumferential surface of the glass tube, a protective layer disposed on a surface of the LED light strip, a plurality of LED light sources mounted on the LED light strip, two first soldering pads arranged at an end of the LED light strip, two notches formed at an edge of the end of the LED light strip, a power supply module configured to drive the plurality of LED light sources. The protective layer comprises two openings to expose the two first soldering pads. The power supply module comprises a printed circuit board comprising two second soldering pads and each of the two first soldering pad soldered to the respective second soldering pad by a solder. The solder is disposed on the first soldering pad, the corresponding second soldering pad and in the corresponding notch. The power supply module comprises a rectifying circuit and a filtering circuit coupled to the rectifying circuit.

An LED tube lamp comprises a glass tube, two end caps coupled to a respective end of the glass tube, an LED light strip attached to an inner circumferential surface of the glass tube, a protective layer disposed on a surface of the LED light strip, a plurality of LED light sources mounted on the LED light strip, two first soldering pads arranged at an end of the LED light strip, two notches formed at an edge of the end of the LED light strip, a power supply module configured to drive the plurality of LED light sources. The protective layer comprises two openings to expose the two first soldering pads. The power supply module comprises a printed circuit board comprising two second soldering pads and each of the two first soldering pad soldered to the respective second soldering pad by a solder. The solder is disposed on the first soldering pad, the corresponding second soldering pad and in the corresponding notch. The power supply module comprises a rectifying circuit and a filtering circuit coupled to the rectifying circuit.

The invention is directed to a control station for a soldering system capable of operating with various types of soldering devices, including various soldering tip configurations, and a program and database of operating parameters that the control station utilizes to identify preferred or optimal power delivery settings for each type of soldering tip size, type of solder and type of work to be soldered so as to have the soldering control station generate and display a suggestion as to the power level settings and requirements for the optimum soldering conditions to users.