A multi-channel dual-mode digital control LED driving circuit and an LED lamp. The driving circuit comprises a current sampling module (10), a comparison and detection module (30), a digital control module (40) and a constant current control module (20). By means of feeding back an adjustment current for the load (70) by the digital control module (40), and feeding back and adjusting a current of the load (70) in real time by the constant current control module (20), the driving circuit adjusts the load (70) in real time, so that dual-mode cooperation working is realized, and thus a response speed is greatly improved, the accuracy of an output voltage and the current of the load (70) is improved, and at the same time, the system stability is enhanced and wide universality is achieved.

A multi-channel dual-mode digital control LED driving circuit and an LED lamp. The driving circuit comprises a current sampling module (10), a comparison and detection module (30), a digital control module (40) and a constant current control module (20). By means of feeding back an adjustment current for the load (70) by the digital control module (40), and feeding back and adjusting a current of the load (70) in real time by the constant current control module (20), the driving circuit adjusts the load (70) in real time, so that dual-mode cooperation working is realized, and thus a response speed is greatly improved, the accuracy of an output voltage and the current of the load (70) is improved, and at the same time, the system stability is enhanced and wide universality is achieved.

The invention provides a multi-channel independent control circuit of lighting power supply, including a power supply control circuit, a transformer, a main current rectifier circuit, a feedback circuit and a main current output circuit, and also including one or more secondary side units. The secondary side unit includes secondary windings, secondary side rectifier circuit, secondary side output circuit, switching circuit, detector and logic control circuit, the secondary side winding is couple to the primary winding, the secondary side rectifier circuit and the secondary side output circuit are sequentially connected in parallel across the loop of the secondary winding, the detector is disposed in the secondary side output circuit and an output end of the detector is connected to an input end of the switching circuit through the logic control circuit. An output end of the switching circuit is connected to the secondary side output circuit. The invention relates to the multi-channel independent control circuit of lighting power supply, realizing independent and normal operation of multiple lighting apparatus or devices, and improving the flexibility, reliability and safety of the entire lighting system.

A load current adjusting circuit can include: a counter configured to generate first and second digital signals in accordance with a pulse signal, where a numerical relationship between the first and second digital signals is determined in accordance with a duty cycle of the pulse signal; and an adjusting circuit configured to adjust a load current to vary along with the duty cycle of the pulse signal in accordance with the first and second digital signals.

A load current adjusting circuit can include: a counter configured to generate first and second digital signals in accordance with a pulse signal, where a numerical relationship between the first and second digital signals is determined in accordance with a duty cycle of the pulse signal; and an adjusting circuit configured to adjust a load current to vary along with the duty cycle of the pulse signal in accordance with the first and second digital signals.

Programmable drivers (or power supplies) for solid state light sources are disclosed, on which output regulation is improved to expand the dimming range to 1% and reduce and/or remove flicker. Additional fault conditions are set up to avoid latching, and thus provide for a controllable restart feature. Such drivers include an isolated half bridge resonant converter with an improved control approach designed to regulate very low current though primary side in a feed-forward loop. Such drivers include both digital and analog loops that improve the performance in steady state and/or during transients, particularly for a lighting load, in comparison to a single full digital control.

A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of a lamp tube in response to a phase-control voltage received from a dimmer switch. The ballast circuit comprises a phase-control-to-DC converter circuit that receives the phase-control voltage, which is characterized by a duty cycle defining a target intensity of the lamp tube, and generates a DC voltage representative of the duty cycle of the phase-control voltage. Changes in the duty cycle of the phase-control voltage that are below a threshold amount are filtered out by the converter circuit, while intentional changes in the duty cycle of the phase-control voltage are reflected in changes in the target intensity level and thereby the intensity level of the lamp tube.

Liquid crystal display (LCD) backlight boost converters are adaptively controlled, digitally, to achieve improved ripple voltage regardless of independent dimming among light emitting diode (LED) strings. Adaptively controlling an LCD backlight boost converter includes determining, during normal operation, an ongoing current or expected current (e.g., load current) provided to or expected to be provided to one or more of the LED strings by the display backlight boost converters. The controlling of the LCD backlight boost converter further includes adjusting a bandwidth of a boost control loop for controlling the LED backlight boost converter based on the ongoing current or expected current to the LED string(s).

Liquid crystal display (LCD) backlight boost converters are adaptively controlled, digitally, to achieve improved ripple voltage regardless of independent dimming among light emitting diode (LED) strings. Adaptively controlling an LCD backlight boost converter includes determining, during normal operation, an ongoing current or expected current (e.g., load current) provided to or expected to be provided to one or more of the LED strings by the display backlight boost converters. The controlling of the LCD backlight boost converter further includes adjusting a bandwidth of a boost control loop for controlling the LED backlight boost converter based on the ongoing current or expected current to the LED string(s).

An inverter producing an alternating current from a direct current source has a primary stage coupled to the direct current source having a step-up transformer, a first switching circuit coupling the direct current to the transformer primary and a rectifier coupled to a secondary of the transformer for producing a DC voltage; a controller for the first switching circuit providing pulse drive signals to control switches of the first switching circuit to cause current to flow in the transformer primary and induce an alternating current in the transformer secondary; a secondary stage receiving the DC voltage having a second switching circuit and a controller for the second switching circuit for generating control signals to cause current through the second switching circuit to flow in alternate directions thorough the load. In one embodiment the alternating current period is divided into time slices and the switches of the first switching circuit are duty cycle modulated at different duty cycles in each time slice. A second embodiment switches series-connected primary windings of a multi-tap transformer.