Energy-saving high-reliability partitioned series light source driving circuit and working method thereof

Abstract

The invention belongs to the technical field of light source driving, and provides an energy-saving high-reliability partitioned series light source driving circuit and a working method thereof, and the circuit comprises a first constant current circuit, a first light source control circuit, a second light source control circuit, a third light source control circuit and a second constant current circuit which are connected in sequence. Each of the first light source control circuit, the second light source control circuit and the third light source control circuit comprises a plurality of light emitting diodes which are connected in series; the first constant current circuit is connected with a power supply, the first constant current circuit is connected with the power supply, and the first constant current circuit and the second constant current circuit are electrically connected with the controller; the first light source control circuit, the second light source control circuit and the third light source control circuit are respectively connected with a controller; the first constant-current circuit and the second constant-current circuit substitute for each other, and when the single-chip microcomputer fails and cannot work, all the LEDs can still be turned on normally, so that the basic lighting requirement is met.

Description

technical field [0001] The invention belongs to the technical field of light source driving, and in particular relates to an energy-saving and high-reliability partitioned series-connected light source driving circuit and a working method thereof. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] In public places such as shopping malls and office buildings with dense traffic, it is necessary to be equipped with fire indicator lights to ensure people's safety. In the event of a fire, it can clearly guide people to the best safe escape exit. But there are generally many deficiencies in existing fire indicator lights: [0004] First, for low-current lighting equipment, the main cause of damage to LED light-emitting diodes is short circuit, accounting for 90%. Nowadays, common LED light-emitting diode circuits are connected in parallel. In a gr...

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Problems solved by technology

[0004] First, for low-current lighting equipment, the main cause of damage to LED light-emitting diodes is short circuit, accounting for 90%. Nowadays, common LED light-emitting diode circuits are connected in parallel. In a group of parallel LED light-emitting diodes, one LED The short circuit of the light-emitting diode will cause the whole group of LED light-emitting diodes to fail to emit light normally, or even damage the power supply. The reliability is low, and it is difficult to locate the faulty LED without dismantling it, and the maintenance is inconvenient;

[0005] Second, LED light-emitting diodes using the parallel connection method need to reduce the high voltage to a lower voltage through a DC step-down circuit, and this process will inevitably cause energy loss

And in order to ensure that the brightness of each LED light-emitting diode is basically the same, it is necessary to use a ballast resistor, which will shorten the service life of its power supply;

[0006] Third, when the controller fails, the existing indicator lights are all off, and even the basic lighting needs cannot be met.

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