Design and Implementation of Centralized LED Street Lamp Power Supply

With the acceleration of urbanization in China, LED street lamps have gradually come into people's vision with the advantages of directional lighting, low power consumption, good driving characteristics, fast response, high seismic capacity, long service life and green environmental protection, and become the new generation of energy-saving light source with the most advantages of replacing traditional light sources in the world. Therefore, LED street lamps will become the best choice for energy-saving transformation of road lighting.

Likai technology has published a series of LED lighting driver ICs in recent years. It has also been paying attention to the development of LED street lamps. This paper mainly puts forward suitable architectures for the application of several different LED street lamps, and analyzes their advantages and disadvantages. So that readers can find out the most appropriate scheme according to their company's situation and the different application scope of street lamps designed. The same architecture can also be used in the design of other high-power lamps.

1. Direct AC input, constant current control for 6 strings of LEDs respectively

Alternating current, referred to as AC. its most basic form is sinusoidal current. The standard frequency of AC power supply in China is 50 Hz, and that in Japan and other countries is 60 Hz. The change of alternating current over time can be expressed in a variety of forms. The application scope and effect of different forms of AC are also different. The variation law of current with time shows that sinusoidal alternating current needs to be described by three physical quantities: frequency, peak value and phase. The basic problems to be discussed in alternating current are the relationship between current and voltage in the circuit and the distribution of power (or energy). Because AC has the characteristics of changing with time, it produces a series of characteristics different from DC circuit. The components used in AC circuit include not only resistance, but also capacitance and inductance. More components are used, and the phenomenon and law are complex.

Among the following schemes, this one should be the most efficient and the lowest circuit cost. The primary side is directly backtracked by photo coupler to adjust the output voltage. Compared with other traditional schemes, there is less switchinglose. Fix the voltage of cspin at 0. 25V, constant current control for 6 strings of LEDs respectively. The IC will detect the position of each string FB and fix the string with the lowest voltage, that is, the string with the highest sum of VF, at 0. 5V。 At this time, due to the difference in the sum of ledvf values of each string, the excess voltage caused by VF difference will fall on the MOS, resulting in some loss. If the LED is generally divided into VF and bin, the loss should be controlled within 2%. Less than general switchinglose. If the primary side of LLC architecture is used, there is an opportunity to make the overall power efficiency close to 90%. At this stage, led factories do not tend to provide high-power ledvf sub bin services. Therefore, it is necessary for the user to adjust the sum of each string of ledvf, resulting in the trouble of mass production. At present, this method is more suitable for programs with extreme pursuit of efficiency, especially some projects priced by the amount of power saving.

Advantages: high efficiency, low cost,

Disadvantages: for AC input, the design of primary side is complex, and the power efficiency is related to the difference of VF of each string.

It is suitable for street lamps in pursuit of high efficiency

2. DC or battery input, and conduct constant current control for 6 strings of LEDs respectively

Direct current (DC for short) refers to the current whose direction and time do not change periodically, but the current may not be fixed and produce waveform. Also known as constant current. The circuit passed through is called DC circuit, which is a closed conductive circuit composed of DC power supply and resistance. The circuit through which DC power passes is called DC circuit, which is a closed conductive circuit composed of DC power supply and resistance. In the DC circuit, a constant electric field is formed. Outside the power supply, the positive charge flows from the high potential to the low potential through the resistance. In the power supply, the electrostatic force is overcome by the non electrostatic force of the power supply, and then from the low potential to the high potential. In this way, it circulates to form a closed current line. Therefore, in the DC circuit, the function of the power supply is to provide a constant electromotive force that does not change with time and supplement energy for the Joule heat consumed on the resistance.

In the design of multi string boost structure, the LED driving mode is similar to the previous one. The difference is that the original AC input is changed to input via adapter or battery. Low sidesense design, as long as the MOS with enough withstand voltage is selected, the LED can be connected to a considerable number. Compared with the previous AC input scheme, the design is relatively simple. However, due to the addition of one boost switching, the efficiency is relatively low, and the design of boost structure, within an appropriate range, the change of efficiency to the output voltage or the number of LEDs is smaller than that of step-down, so the LED configuration of this architecture is more flexible. The change of the number of LEDs is not easy to lead to the change of output current or efficiency. Suitable for applications requiring any number of LEDs.

Advantages: simple design and low circuit cost;

Disadvantages: low efficiency and related to VF;

It is suitable for multi string led design that needs to flexibly configure the number of LEDs.

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