Constant-current driving device and starting method thereof

Abstract

An embodiment of the invention discloses a constant-current driving device and a starting method thereof and belongs to the field of circuit devices for electric light sources. The device comprises a power supply, an LED lamp set, a starting circuit, a first diode and a second diode, wherein the power supply is connected with a cathode end of the first diode, a cathode end of the second diode and an input end of the LED lamp set respectively, an anode end of the second diode is connected with a starting end of the starting circuit, an output end of the LED lamp set is connected with an input end of the starting circuit, and an anode end of the first diode and an output end of the starting circuit are connected with a cathode of the power supply. According to the constant-current driving device, the cost of a low starting voltage device in an existing starting circuit is effectively reduced.

Description

technical field [0001] The invention relates to the field of electric light source circuit devices, in particular to a constant current drive device and an opening method thereof. Background technique [0002] LED lighting has the advantages of high luminous efficiency, long life, energy saving and environmental protection, and is more and more widely used in street lights, tunnel lights and indoor lighting and other occasions. AC power supply LED lighting can reduce costs, but grid voltage fluctuations will cause LED overcurrent drive and affect its service life, so it is important to drive LEDs with constant current in the case of AC power supply. [0003] At present, there are many kinds of circuits or electrical appliances that realize constant current, and there are three representative ones, namely: using depletion power MOS devices, operational amplifier constant current sources and MOS hybrid circuits. In order to reduce the loss of the open circuit, it is necessary ...

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Problems solved by technology

AC power supply LED lighting can reduce costs, but grid voltage fluctuations will cause LED over-current drive and affect its service life, so it is important to drive LEDs with constant current in the case of AC power supply

[0003] At present, there are many kinds of circuits or electrical appliances that realize constant current, and there are three representative ones, namely: using depletion power MOS devices, operational amplifier constant current sources and MOS hybrid circuits. In order to reduce the loss of the open circuit, it is necessary to Reduce the turn-on voltage of the turn-on circuit. The existing technology uses a low-voltage regulator chip, which can achieve the effect of low turn-on voltage of the turn-on circuit, but the manufacturing cost is too high

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