An LED tube lamp comprises: a glass lamp tube; a light diffusion layer disposed on a surface of the glass lamp tube; an LED light strip, which comprises a fixing portion and an extending portion disposed in the glass lamp tube; a plurality of LED light sources mounted on the fixing portion of the LED light strip; a fixing structure disposed between the fixing portion and the inner circumferential surface the glass lamp tube; a power supply module disposed on the fixing structure and electrically connecting to the LED light strip and two end caps attached to two ends of the glass lamp tube respectively. The fixing structure comprises a first end fixedly connected to the inner circumferential surface of the glass lamp tube and a second end fixedly connected to the fixing portion of the LED light strip and not connected to the extending portion of the LED light strip.

Disclosed is a driving circuit for a Light Emitting Diode (LED) lamp, the LED lamp containing the driving circuit and a method for operating the driving circuit. The driving circuit includes: three alternating voltage input terminals, including two alternating voltage input terminals for receiving an alternating voltage and one common terminal, the two alternating voltage input terminals are controlled so that at least one alternating voltage input terminal receives the alternating voltage from a power supply; a constant current control circuit receiving the alternating voltage through at least one alternating voltage input terminal and outputting a constant direct current to an LED load, the constant current control circuit includes a constant current control chip having a maximum on-time pin; and a three-stage dimming detection control circuit including a variable control resistor for three-stage dimming control, and is controlled by the alternating voltage received by at least one alternating voltage input terminal so that the variable control resistor is connected to the maximum on-time pin with different resistance values, and the constant current control chip outputs three different current levels according to a resistance value of the connected variable control resistor.

Disclosed is a driving circuit for a Light Emitting Diode (LED) lamp, the LED lamp containing the driving circuit and a method for operating the driving circuit. The driving circuit includes: three alternating voltage input terminals, including two alternating voltage input terminals for receiving an alternating voltage and one common terminal, the two alternating voltage input terminals are controlled so that at least one alternating voltage input terminal receives the alternating voltage from a power supply; a constant current control circuit receiving the alternating voltage through at least one alternating voltage input terminal and outputting a constant direct current to an LED load, the constant current control circuit includes a constant current control chip having a maximum on-time pin; and a three-stage dimming detection control circuit including a variable control resistor for three-stage dimming control, and is controlled by the alternating voltage received by at least one alternating voltage input terminal so that the variable control resistor is connected to the maximum on-time pin with different resistance values, and the constant current control chip outputs three different current levels according to a resistance value of the connected variable control resistor.

An electrical circuit for providing led light bulb drivers with the necessary electrical load for most triac and digital dimmer switches and provide dimming control to mimic incandescent light bulbs is described herein. The electrical circuit includes a non-linear electrical load circuit that is electrically coupled to a rectified alternating current (AC) input power source and providing the necessary load current to initiate and maintain activation of triac and digital dimmer switches. A phase sense and amplifier circuit is also coupled to the rectified AC input power source and it senses the AC input voltage phase, then transmits a control signal to the light emitting diode (LED) driver to adjust the current level of the power being delivered to the LEDs in a manner to mimic the dimming of incandescent light bulbs.

An electrical circuit for providing led light bulb drivers with the necessary electrical load for most triac and digital dimmer switches and provide dimming control to mimic incandescent light bulbs is described herein. The electrical circuit includes a non-linear electrical load circuit that is electrically coupled to a rectified alternating current (AC) input power source and providing the necessary load current to initiate and maintain activation of triac and digital dimmer switches. A phase sense and amplifier circuit is also coupled to the rectified AC input power source and it senses the AC input voltage phase, then transmits a control signal to the light emitting diode (LED) driver to adjust the current level of the power being delivered to the LEDs in a manner to mimic the dimming of incandescent light bulbs.

The invention relates to an incorporation of a current limiting/regulating circuit on a luminaire board for ensuring that the luminaire board will automatically operate at its desired current after a replacement. Since the current control at the luminaire board causes an initial mismatch between the current supply of the driver and the demand of the luminaire board, the driver output voltage will drift towards the maximum output voltage of the driver. When the maximum output voltage is reached, the driver is configured to operate in constant-voltage (CV) mode, sense the output current and reduce its output current to the same value as consumed by current-controlled luminaire board. Alternatively, the driver may gradually reduce the setpoint of the output current until it just leaves the CV mode and stay at that setpoint. In this way, the driver will automatically operate at the correct current of a newly installed luminaire board without any action from the user.

The invention relates to an incorporation of a current limiting/regulating circuit on a luminaire board for ensuring that the luminaire board will automatically operate at its desired current after a replacement. Since the current control at the luminaire board causes an initial mismatch between the current supply of the driver and the demand of the luminaire board, the driver output voltage will drift towards the maximum output voltage of the driver. When the maximum output voltage is reached, the driver is configured to operate in constant-voltage (CV) mode, sense the output current and reduce its output current to the same value as consumed by current-controlled luminaire board. Alternatively, the driver may gradually reduce the setpoint of the output current until it just leaves the CV mode and stay at that setpoint. In this way, the driver will automatically operate at the correct current of a newly installed luminaire board without any action from the user.

A light emitting element driving circuit (2) according to the present disclosure includes a constant current circuit (10), a switch (20), and a booster circuit (30). The constant current circuit (10) supplies a constant current (Ia) from a power supply voltage (Vcc) to a light emitting element (3). The switch (20) disconnects or connects a current (I1) flowing through the light emitting element (3) based on an external signal. The booster circuit (30) boosts a voltage between the power supply voltage (Vcc) and the light emitting element (3) in synchronization with a timing at which the light emitting element (3) is turned on.

A light emitting element driving circuit (2) according to the present disclosure includes a constant current circuit (10), a switch (20), and a booster circuit (30). The constant current circuit (10) supplies a constant current (Ia) from a power supply voltage (Vcc) to a light emitting element (3). The switch (20) disconnects or connects a current (I1) flowing through the light emitting element (3) based on an external signal. The booster circuit (30) boosts a voltage between the power supply voltage (Vcc) and the light emitting element (3) in synchronization with a timing at which the light emitting element (3) is turned on.

A system for controlling power provided to an electronic device includes a driver configured to drive the electronic device and having an on state and an off state. The system further includes a sensor configured to detect detected electrical data corresponding to electricity provided to the driver. The system further includes a controller configured to compare the detected electrical data to a threshold electrical value and to determine a fault condition in response to the detected electrical data being greater than or equal to the threshold electrical value and to turn the driver to the off state in response to the controller determining the fault condition.