An LED tube lamp comprises an LED module for emitting light; and a ballast interface circuit coupled to the LED module and comprising a thyristor device configured to determine whether an input external driving signal is a high frequency or high voltage signal. When the external driving signal is determined to be a high frequency or high voltage signal, the ballast interface circuit causes current conduction in the LED module for emitting light, and specifically the thyristor device is configured to conduct current upon the external driving signal being input. The ballast interface circuit further comprises a transistor, an inductor, and a resistor connected to each other; and the inductor is coupled between a terminal of the thyristor device and the LED module. Upon the thyristor device being turned on a current flowing through the inductor and the transistor maintains the conduction state of the thyristor device.

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 soldering iron system with automatic variable temperature control comprising a hand piece or robot arm including a soldering cartridge having a soldering tip, a coil that generates a magnetic field, and a temperature sensor for sensing a temperature of the soldering tip; a variable power supply for delivering variable power to the coil to heat the soldering tip; a processor including associated circuits for accepting a set temperature input and the sensed temperature of the soldering tip, and providing a control signal to control the variable power supply to deliver a suitable power to the coil to keep the temperature of the soldering tip at a substantially constant level of the set temperature input.

An LED tube lamp with overvoltage protection capability is provided. The LED tube lamp includes a lamp tube, two external connection terminals, a rectifying circuit, a filtering circuit, an LED module, and a protection circuit. The protection circuit is coupled between two input terminals of the LED module and configured to perform overvoltage protection when determining that a voltage level between the two input terminals of the LED module reaches or is higher than a predefined voltage value, wherein the protection circuit includes a diode and the predefined voltage value is in a range of about 40V to about 600V.

An LED tube lamp with overvoltage protection capability is provided. The LED tube lamp includes a lamp tube, two external connection terminals, a rectifying circuit, a filtering circuit, an LED module, and a protection circuit. The protection circuit is coupled between two input terminals of the LED module and configured to perform overvoltage protection when determining that a voltage level between the two input terminals of the LED module reaches or is higher than a predefined voltage value, wherein the protection circuit includes a diode and the predefined voltage value is in a range of about 40V to about 600V.

A heating apparatus for induction heating is disclosed. The heating apparatus may comprise a bearing ring, at least one bearing element disposed in the bearing ring, and a braze material adjacent to the at least one bearing element and the bearing ring. The heating apparatus may additionally comprise an inductor positioned radially adjacent to at least a portion of the bearing ring. A current source may be electrically coupled to the inductor. A bearing orienting member may also abut a surface of the at least one bearing element. The bearing orienting member may orient a surface of the at least one bearing element. A heating method is also disclosed.

An induction coil assembly includes an annular member extending from a first end to a second end, and extending about a longitudinal axis; a first leg extending from the first end of the annular member, and including a first electrical connection portion and a first axial portion; and a second leg extending from the second end of the annular member, and including a second electrical connection portion and a second axial portion. An internal surface of the annular member defines a first fluid passage through the annular member. An internal surface of the first leg defines a second fluid passage through the first leg. An internal surface of the second leg defines a third fluid passage through the second leg. The second fluid passage is in fluid communication with the third fluid passage via the first fluid passage.

A device for soldering an electrical conductor with a connection device includes a base plate having a passageway and an anvil mounted on the base plate and at least partially housed in the passageway. The anvil is electrically insulated from the base plate and positioned to allow an electrical current to pass through the electrical conductor and/or the connection device.

An electrical connection is established between a first electrical component and a second electrical component of an assembly and a compression tool is used to apply a compression force to the assembly. The assembly also includes a metallized particle interconnect (MPI) between the first electrical component and the second electrical component and solder components outside a boundary of the MPI and extending from the first electrical component to the second electrical component. The solder components are melted by applying heat to the assembly. The solder components are solidified by cooling the assembly and the compression tool is removed.