A lamp circuit including a light emitting circuit and a light emission control circuit that controls the light emitting circuit. The light emitting circuit includes a thermistor and a light emitting device, and the light emission control circuit comprised a constant current circuit, dimming control circuit, voltage divider having a first resistor and a second resistor, and a current amplification circuit. The current amplification circuit amplifies a current of the thermistor, and the voltage divider divides a first voltage to a first node between the first resistor and the second resistor based on the amplified current. The dimming control circuit controls an output current of the constant current circuit based on the first voltage, and the constant current circuit outputs a current to the light emitting device based on the control of the dimming control circuit.

A lamp circuit including a light emitting circuit and a light emission control circuit that controls the light emitting circuit. The light emitting circuit includes a thermistor and a light emitting device, and the light emission control circuit comprised a constant current circuit, dimming control circuit, voltage divider having a first resistor and a second resistor, and a current amplification circuit. The current amplification circuit amplifies a current of the thermistor, and the voltage divider divides a first voltage to a first node between the first resistor and the second resistor based on the amplified current. The dimming control circuit controls an output current of the constant current circuit based on the first voltage, and the constant current circuit outputs a current to the light emitting device based on the control of the dimming control circuit.

A method for controlling an amount of power delivered to an electrical load may include controlling an average magnitude of a load current towards a target load current that ranges from a maximum-rated current to a minimum-rated current in a normal mode, and controlling the average magnitude of the load current below the minimum-rated current in a burst mode. The burst mode may include at least one burst-mode period that comprises a first time period associated with an active state and a second time period associated with an inactive state. During the burst mode, the method may include regulating a peak magnitude of the load current towards the minimum-rated current during the active state, and stopping the generation of at least one drive signal during the inactive state to control the average magnitude of the load current to be less than the minimum-rated current.

A method for controlling an amount of power delivered to an electrical load may include controlling an average magnitude of a load current towards a target load current that ranges from a maximum-rated current to a minimum-rated current in a normal mode, and controlling the average magnitude of the load current below the minimum-rated current in a burst mode. The burst mode may include at least one burst-mode period that comprises a first time period associated with an active state and a second time period associated with an inactive state. During the burst mode, the method may include regulating a peak magnitude of the load current towards the minimum-rated current during the active state, and stopping the generation of at least one drive signal during the inactive state to control the average magnitude of the load current to be less than the minimum-rated current.

A buffer circuit for an LED driver circuit, a LED driver circuit, and a control method, the buffer circuit includes a first control switch connected in series in a rectified input loop and a feedback control module connected to the rectified input loop to obtain a loop current in the rectified input loop for generating a first control signal to the first control switch according to the loop current and a reference signal. The first control switch switches between a fully conducting state and a non-fully-conducting state based on the first control signal and restrains the loop current when the first control switch is in the non-fully-conducting state. The buffer circuit enhances the effect of restraining the current change rate and can effectively restrain current spikes in a circuit, resulting in higher safety and reliability.

A buffer circuit for an LED driver circuit, a LED driver circuit, and a control method, the buffer circuit includes a first control switch connected in series in a rectified input loop and a feedback control module connected to the rectified input loop to obtain a loop current in the rectified input loop for generating a first control signal to the first control switch according to the loop current and a reference signal. The first control switch switches between a fully conducting state and a non-fully-conducting state based on the first control signal and restrains the loop current when the first control switch is in the non-fully-conducting state. The buffer circuit enhances the effect of restraining the current change rate and can effectively restrain current spikes in a circuit, resulting in higher safety and reliability.

A method of operating a warning light assembly at a railway crossing, as well as a warning light assembly operable in accordance with such a method, are disclosed. An example method includes receiving a voltage signal at the warning light assembly that corresponds to a railway crossing event. The method includes initiating a warning light flashing sequence that includes, during a first time period, illuminating the warning light during receipt of the voltage signal in a flashing pattern having a flashing frequency. The warning light flashing sequence also includes, during a second time period after the first time period, discontinuing the flashing pattern and illuminating the warning light in accordance with the voltage signal. Upon determining that receipt of the voltage signal at the warning light assembly is discontinued for at least for a predetermined time, the warning light flashing sequence is reinitialized for a next railway crossing event.

A lighting control device switches an input voltage to generate an output voltage and supplies a driving current based on the output voltage to a lighting unit. A raw control signal is generated to specify a lighting period and an extinction period alternately, and a corrected control signal is generated by correcting the raw control signal based on the current through the lighting unit. A switching controller performs the switching of the input voltage during the lighting period specified by the corrected control signal and suspends the switching of the input voltage during the extinction period specified by the corrected control signal.

A light fixture system comprising a light fixture comprising light sources arranged in groups, wherein each group comprises one or more light sources, and a controller, wherein the controller is arranged to control the groups so that each of the groups is repeatedly switched on and off, wherein at a first point in time some groups are switched on and others are switched off, at a second point in time some of the groups which were switched on at the first point in time are switched off, and some of the groups which were switched off at the first point in time is switched on, and at a third point in time some of the groups which were switched on at the second point in time are switched off, and some of the groups which were switched off at the second point in time are switched on.

A light fixture system comprising a light fixture comprising light sources arranged in groups, wherein each group comprises one or more light sources, and a controller, wherein the controller is arranged to control the groups so that each of the groups is repeatedly switched on and off, wherein at a first point in time some groups are switched on and others are switched off, at a second point in time some of the groups which were switched on at the first point in time are switched off, and some of the groups which were switched off at the first point in time is switched on, and at a third point in time some of the groups which were switched on at the second point in time are switched off, and some of the groups which were switched off at the second point in time are switched on.