A multi-channel LED driver for dimming based on capacitive self-leveling
An LED driver and self-leveling technology, applied in the field of LED lighting, to achieve the effects of large LED dimming range, increased stability, and low conduction loss
Active Publication Date: 2019-08-27
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a multi-channel LED driver that realizes dimming based on capacitive self-leveling with simple structure, less components, and high stability, and realizes more outputs and more accurate equalization with a small number of components. The dimming ability can be doubled without increasing the number of devices. Only need to feed back any signal of any of the eight LED lamps to meet the wide-range dimming of all LED lamp strings. Make full use of the capacitor charge balance to achieve current sharing, effectively It reduces the problem of inaccurate current sharing by using capacitive impedance matching; the time-division multiplexing dimming unit reduces the number of devices used, improves the efficiency of the driver, and effectively reduces the installation space required by the driver; at the same time, the average The current capacitor is used for resonance at the same time, which simplifies the circuit structure and improves the overall stability of the circuit.
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[0020] Combine below Figure 1 ~ Figure 3 The present invention will be further described with specific examples.
[0021] like Figure 1 ~ Figure 3 As shown, the embodiment relates to a multi-channel LED driver that realizes dimming based on capacitive self-balancing, which includes a half-bridge chopping unit U, a half-wave rectifying unit X, a resonance unit Z, and a current sharing unit Y; the resonance unit As a dimming unit, Z is time-divisionally multiplexed by a half-bridge chopper unit U with superimposed output from top to bottom; a half-wave rectifier unit X and a current equalization unit Y are connected in series between the half-bridge chopper unit U and the resonant unit Z.
[0022] Further, the half-bridge chopping unit U includes a first electrolytic capacitor C 1 , the second electrolytic capacitor C 2 , the first switch tube S 1 and the second switch tube S 2 ; The first switch tube S 1 source and the second switch S 2 The drains of the first electrol...
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The invention discloses a multi-channel LED driver capable of dimming based on capacitive self-current sharing, which belongs to the field of LED lighting (Light-emitting Diode Lighting), and includes a half-bridge chopping unit U, a half-wave rectifying unit X, and a resonance unit Z and the current sharing unit Y; the resonant unit Z is time-division multiplexed as a dimming unit by the half-bridge chopper unit U that superimposes the output on the upper and lower sides; a half-wave rectifier unit X is connected in series between the half-bridge chopper unit U and the resonant unit Z and current sharing unit Y. The present invention doubles the dimming ability without increasing the number of devices, and only needs to feed back any signal of any of the eight LED lamps to satisfy the wide-range dimming of all LED lamp strings, and fully utilizes the capacitor charge balance to achieve current sharing, effectively It reduces the inaccurate problem of using capacitive impedance matching to achieve current sharing; the time-division multiplexing dimming unit reduces the number of devices used, improves efficiency, and reduces installation space; the use of current sharing capacitors for resonance simplifies the circuit structure and improves The overall stability of the circuit.
Description
technical field [0001] The invention relates to the field of LED lighting (Light-emitting Diode Lighting), in particular to a multi-channel LED driver for realizing dimming based on capacitive self-current sharing. Background technique [0002] The traditional LED driver adopts the PWM (Pulse-width Modulation) strategy to realize multi-channel LED dimming, but due to the changing pulse width trigger signal, the switching device cannot realize soft switching, the conduction loss is large, the transfer efficiency is low, and its reliability is poor and dynamic Disadvantages such as slow response are no longer applicable in many occasions that require high LED drive. The traditional use of PFM (Pulse-frequency Modulation) to achieve post-stage regulation will inevitably result in high EMI (Eletromagnetic Interference) and low efficiency of magnetic components. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a multi...
Claims
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IPC IPC(8): H05B33/08H05B44/00
Inventor 梁国壮田涵雷王子园
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY