The real long-term development of the courtyard lamp price market

With the blowout of the courtyard lamp price market entering the market, the development gradually became clear. Solar garden light manufacturers have been rushing to the LED market, and the situation is unstoppable. Although the LED industry has developed rapidly in recent years, it still lacks authoritative technical standards, resulting in an imbalance in the entire industry, which is not conducive to large-scale promotion. For LED street lights with high technical difficulty, the problems caused by the lack of technical standards are particularly obvious. Many solar garden light manufacturers with excellent technology do not know how to design practical LEDs, and the application department cannot explain the specific requirements. For example, many solar garden lamp manufacturers have designed 'hollow lamp' shades to solve the heat dissipation problem of LEDs. But for solar garden lights, this shape has poor 'wind and rain' function and is not suitable for solar garden lights.

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u003cbru003e If there is no repeated grounding, when the PE is disconnected, the system is in an unprotected state, neither connected to zero nor grounded. After multiple grounding, when PE is normal, the system enters the zero protection state. When PE is disconnected, if the disconnection is before repeated grounding, the system is in a grounding protection state. The TN-S system with repeated grounding has a double protection function, that is, after disconnecting the PE connection, the TN-S system will change to the TT system protection mode (PE disconnection is located on the front side of the repeated grounding).

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u003cbru003e When the phase wire hits the shell and a short circuit occurs, repeated grounding of the PE wire will reduce the ground voltage of the device shell. When the phase wire touches the shell, the voltage of the shell to ground is equal to the voltage between the fault point P and the neutral point of the transformer. Assuming that the specifications of the phase wire and the PE wire are the same, the voltage of the equipment casing to the ground is 110V. Moreover, after the PE line is repeatedly grounded, starting from the fault point P, the impedance of the PE line and the resistance of the repeated grounding RF are parallel to the resistance after the grounding resistance RA is connected in series. Generally, because the resistance of the repeated grounding resistance RF and the working grounding resistance R in series is much larger than the impedance of the PE wire itself, the equivalent impedance from P to the neutral point of the transformer is still close to the equivalent impedance from P to the neutral point of the transformer. The impedance of the PE line at the neutral point of the transformer. If the specifications of the phase wire and the PE wire are the same, the voltage UP between P and the neutral point of the transformer is still about 110V, and the voltage UP of the equipment casing to the ground is only a part of the voltage between the fault point P and the neutral point of the transformer. Between the UP.

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u003cbru003e Although the solar garden light market is developing rapidly with the strong support of the government, the real long-term development of the solar garden light market is still facing severe challenges. At present, in addition to the high cost, the main problems faced by solar garden light products include: light source, heat dissipation and power supply system.

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u003cbru003e From the perspective of the light source, on the one hand, it is necessary to further improve the luminous efficiency of the LED; on the other hand, it is necessary to improve the arrangement of the light source. At present, most of the solar garden light products on the market of solar garden light manufacturers are arranged in a dot matrix structure. The advantage of this method is to help solve the heat dissipation problem. The large distribution range of the light source makes it impossible to achieve concentrated light distribution, and an auxiliary lens is required to achieve independent light distribution. This requires more choices of materials for auxiliary lenses. At present, secondary lenses of different materials have certain problems and affect the use of products. If not handled properly, the lens will also affect the lighting effect and the clarity of the road.

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u003cbru003e In order to improve the above problems, some garden lamp manufacturers have introduced light sources that use integrated modules. This light source reduces the lack of brightness of one or more products, which is caused by the arrangement of the light source when the finished product is working. In addition, since the reflector can be used to achieve concentrated light distribution, the negative effects caused by the use of auxiliary lenses can also be avoided. But it is undeniable that the light source using this package will face more severe heat dissipation challenges. From the power point of view, it is different from traditional lighting products that can be directly connected to AC power.