A lamp with anti-shock protection and compatible with a plurality of power supply modes is provided. The lamp includes a plurality of lighting elements and a control circuit. The control circuit includes an electric shock protection circuit, a filtering and constant current driving circuit, a type A electronic rectifier circuit and a fast-start inductive rectifier detection and driving circuit. The fast-start inductive rectifier detection and driving circuit includes a first resistor R11, a TVS1 and a PTC resistor. The PTC resistor is electrically connected in series with the TVS1. The first resistor R11 is connected in parallel to both ends of the TVS1 as a dummy load. The input voltage rectification and voltage clamping module rectifies the input AC voltage to convert it to pulsating DC voltage and then clamps the rectified pulsating DC voltage as the power supply for the signal transmission component U1.

The invention further describes tube LED lamp (1) realised to replace a fluorescent tube lamp (70), which tube LED lamp (1) comprises a tube (12) containing an LED arrangement (10) with a number of LEDs (100); a connector arrangement (16A, 16B) with connectors (16) realized for insertion into sockets (50) of a socket arrangement (50A, 50B) of a tube lamp housing (5) incorporating a dimming ballast (20, 21); a driver circuit arrangement (11) for driving the LED arrangement (10), which driver circuit arrangement (11) is realized to output an LED current (I.sub.LED) on the basis of an input current provided by the dimming ballast (20, 21); and a safety switch (S.sub.13, M1) arranged within the tube (12) to electrically isolate connectors (16) of the connector arrangement (16A, 16B), wherein the safety switch (S.sub.13, M1) is arranged between the driver circuit arrangement (11) and the LED arrangement (10). The invention further describes a method of driving a tube LED lamp (1) from a dimming ballast (20, 21) of a fluorescent tube lamp (70).

The invention further describes tube LED lamp (1) realised to replace a fluorescent tube lamp (70), which tube LED lamp (1) comprises a tube (12) containing an LED arrangement (10) with a number of LEDs (100); a connector arrangement (16A, 16B) with connectors (16) realized for insertion into sockets (50) of a socket arrangement (50A, 50B) of a tube lamp housing (5) incorporating a dimming ballast (20, 21); a driver circuit arrangement (11) for driving the LED arrangement (10), which driver circuit arrangement (11) is realized to output an LED current (I.sub.LED) on the basis of an input current provided by the dimming ballast (20, 21); and a safety switch (S.sub.13, M1) arranged within the tube (12) to electrically isolate connectors (16) of the connector arrangement (16A, 16B), wherein the safety switch (S.sub.13, M1) is arranged between the driver circuit arrangement (11) and the LED arrangement (10). The invention further describes a method of driving a tube LED lamp (1) from a dimming ballast (20, 21) of a fluorescent tube lamp (70).

A load control device for controlling the amount of power delivered to an electrical load is able to operate in a normal mode and a burst mode. The load control device may comprise a control circuit that activates an inverter circuit during active state periods and deactivates the inverter circuit during inactive state periods. The control circuit may operate in the normal mode to regulate an average magnitude of a load current conducted through the electrical load to be above a minimum rated current. The control circuit may operate in the burst mode to adjust the average magnitude of the load current to be below the minimum rated current. The control circuit may adjust the average magnitude of the load current by adjusting the length of the inactive state periods while holding the length of the active state periods constant.

A load control device for controlling the amount of power delivered to an electrical load is able to operate in a normal mode and a burst mode. The load control device may comprise a control circuit that activates an inverter circuit during active state periods and deactivates the inverter circuit during inactive state periods. The control circuit may operate in the normal mode to regulate an average magnitude of a load current conducted through the electrical load to be above a minimum rated current. The control circuit may operate in the burst mode to adjust the average magnitude of the load current to be below the minimum rated current. The control circuit may adjust the average magnitude of the load current by adjusting the length of the inactive state periods while holding the length of the active state periods constant.

The present disclosure discloses an enable signal generation circuit, comprising: an input module configured to input a direct current signal from the first input terminal to a first node; a transmission module configured to transmit the direct current signal at the first node to an output terminal; a first conducting module and a second conducting module configured to conduct signals in an alternating current signal from the second input terminal to the first node; a first filter module configured to filter the signal at the first node such that, at the first node, the alternating current signal from the second input terminal is conducted to a common terminal. The second input terminal is connected to the output terminal. The present disclosure simplifies the circuit structure and solves the problem caused by the difference between timing sequences of inputted signals.

A circuit and a method for detecting a current zero-crossing point, and a circuit and method for detecting a load voltage are disclosed. The circuit for detecting current zero-crossing point includes: a load power supply circuit (14), a voltage-dividing resistor (16), a transistor switch (15), a zero-crossing detection circuit (19); the load power supply circuit (14) includes: a load (11), a diode (13), and an inductor (12); one end of the load power supply circuit (14) is connected with the operating voltage input terminal, the other end of the load power supply circuit (14) is connected with a first end of the transistor switch (15) and a first end of the voltage-dividing resistor (16), a second end of the voltage-dividing resistor (16) and a second end of the transistor switch (15) are connected with the ground, the load voltage is controlled by the transistor switch (15), the voltage-dividing terminal of the voltage-dividing resistor (16) is connected to a signal input terminal of the zero-crossing detection circuit (19), the zero-crossing detection circuit (19) is used to determine whether the current of the diode (13) crosses zero to obtain the on time of the diode (13), and the circuit for detecting load voltage uses the on time of the diode (13) and the on time of the transistor switch (15) to obtain the load voltage. The circuits are simple, but with high detection efficiency and low cost.

A light-emitting diode (LED) smart control circuit and the related LED lighting device are provided. The LED smart control circuit includes a microprocessor, a bridge rectifier, a transformer circuit, a power grid detection unit, a voltage detection unit, a battery charging controller, a first sampling circuit, a second sampling circuit, a constant current controller, and an external rechargeable battery. The LED smart control circuit is configured for controlling LED light source components to emit light. An LED lighting device includes the LED light source components, a smart control circuit board, a rechargeable battery, a shell, and a lamp head. The smart control circuit board is integrated with the disclosed LED smart control circuit.

A load control device for controlling power delivered from a power source to an electrical load may comprise a control circuit configured to control the load regulation circuit to control the power delivered to the electrical load. The control circuit may be configured to operate in an AC mode when an input voltage is an AC voltage and in a DC mode when the input voltage is a DC voltage. The control circuit may be configured to disable the power converter in the DC mode. The control circuit may be configured to render a controllable switching circuit conductive in the AC mode, and non-conductive in the DC mode. The rectifier circuit may be configured to rectify the input voltage to generate a rectified voltage when the input voltage is an AC voltage, and to pass through the input voltage when the input voltage is a DC voltage.

Lighting fixtures are provided. In one example implementation, a lighting fixture can include a housing, one or more drivers, and means for securing the one or more drivers to the housing to decrease thermal resistance between one or more of the drivers and the housing. The lighting fixture can also include an LED system comprising a light engine having a plurality of LED devices. The plurality of LED devices can be arranged on an LED board of the light engine such that a first portion of the LED board has a first density of LED devices and a second portion of the LED board has a second density of LED devices. The first density can be different than the second density.