LED constant current driving power supply
A technology of constant current drive and power supply, applied in the direction of electric light source, light source, electric lamp circuit layout, etc., can solve the problems of low power, no belt, general constant current characteristics of the whole machine, etc.
Inactive Publication Date: 2016-01-06
天津市易伸科技有限公司
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Problems solved by technology
[0004] At present, the constant current power supply used in the LED lamp drive on the market generally does not have a power factor correction circuit or only adopts a passive power factor correction method, and the power factor is low; the power of the whole machine is not high, generally below 83%. The service life is generally not more than two years; the constant current characteristics are average, especially in the high temperature environment for a long time, the output current drop has reached 10mA
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[0011] The specific embodiment of the present invention will be described below in terms of circuit and structure in conjunction with the accompanying drawings.
[0012] The schematic circuit diagram of the present invention is as figure 1 , figure 2 Shown: build PFC circuit and flyback circuit with SSL1750T chip as the core to realize high voltage constant current output. Before the input AC mains is rectified by the rectifier bridge, a fuse and a thermistor are connected in series to realize short-circuit protection and limit the start-up inrush current; Y capacitors and common-mode inductors form an input filter to improve EMC performance. The rectifier bridge uses a 600V / 1.5A bridge stack to meet the natural cooling design of the maximum 264V AC input voltage and 28W input power. After the AC input is rectified by the rectifier bridge, it is boosted to a 400V DC voltage output by the first-stage BOOST circuit, and at the same time, the circuit completes the input PFC fu...
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The invention belongs to the field of LED driving technologies, and relates to an LED constant current driving power supply. The LED constant current driving power supply comprises a circuit board and a magnetic device. In the circuit design, a PFC circuit and a flyback circuit are constructed by taking an SSL1750T chip as the core, and constant current output with a high power factor, high efficiency and low noise is realized; in the PCB structure design, the devices of the control circuit taking the SSL1750T chip as the core are all disposed on a control panel with the size of 38mm*18.5mm, and all devices are surface mounted devices; and a power device and the circuit portion related to high voltage are arranged on a power supply mainboard with the size of 120mm*34mm, and the surface mounted device are all arranged at the back surface. The size of the power supply is reduced, and high power density is realized. Two main magnetic elements of a PFC inductor and a main transformer are specially designed so as to meet requirements for technical indexes of the PCB structure and the power supply circuit.
Description
technical field [0001] The invention belongs to the technical field of LED driving, and in particular relates to a LED constant current driving power supply. Background technique [0002] With the continuous development and maturity of LED manufacturing technology and the gradual decline of production costs, LED light sources have begun to be widely used in automotive lights, special lighting fixtures, public lighting and other fields. They have huge development potential and are considered to be the most Light source for development prospects. [0003] According to the characteristics of LEDs, current LED lamps basically use constant current sources as driving power sources. Compared with other semiconductor lighting equipment, LED lamps are small and medium power lamps. Usually, multiple power LEDs are connected in series or parallel to form the light source of the lamp. It is driven by the constant current output power input from the mains. It is mainly used in offices, ...
Claims
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IPC IPC(8): H05B37/02
Inventor 罗静杨新璇信长健牛萍娟牛翔华
Owner 天津市易伸科技有限公司