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Dual-channel LED driver and open-circuit protection method thereof

A LED driver, dual-channel technology, applied in electrical components, electroluminescent light sources, lighting devices, etc., to achieve the effect of ensuring system safety and reducing power consumption

Active Publication Date: 2017-02-22
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When an open-circuit condition occurs on one of the channels of the dual-channel LED, how to detect the open-circuit condition, ensure the safety of the system (no overvoltage) and continue to provide lighting is a challenge

Method used

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  • Dual-channel LED driver and open-circuit protection method thereof
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  • Dual-channel LED driver and open-circuit protection method thereof

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0021] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a dual-channel LED driver and an open-circuit protection method thereof. The dual-channel LED driver is used for driving a first channel LED and a second channel LED and comprises a power converter, a power control circuit, a latch circuit, a first dimmer switch and a second dimmer switch; and when the first channel LED or the second channel LED is in an open circuit, an open circuit state of an open channel LED is locked and an unopened channel LED is kept unblocked. According to the dual-channel LED driver and the open circuit protection method thereof, the conditions that lighting service can be continuously provided and the system security is ensured when one channel LED is in an open circuit condition are ensured.

Description

technical field [0001] The invention relates to an electronic circuit, more specifically, the invention relates to a dual-channel LED (light emitting diode) driver and an open circuit protection method thereof. Background technique [0002] With the continuous development of technology, LED is gradually replacing the application of fluorescent lamps in liquid crystal display backlight and general lighting due to its small size, simple driving, energy saving and environmental protection. LEDs need a driver circuit to provide them with a controlled current signal. In some applications, in addition to the controlled LED current, some power supply voltages such as 12V, 5V, 3.3V are required for other modules (such as microcontroller MCU, wireless control module RF, routers, etc.) )powered by. [0003] The existing dual-channel LED drive circuit usually uses two power stages: the first power stage includes such as a flyback converter to provide two constant voltages, one of whi...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/50H05B45/00Y02B20/30
Inventor 邝乃兴王凯
Owner CHENGDU MONOLITHIC POWER SYST
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