18 w solar street light

The connecting way of LED street lamp current mature application of 1 w leds is a single grain, obviously, to do such a semiconductor light is only 50 luminous tube. Only 50 LED the entire series, or there are some problems in parallel. If all the series connection, if there is a grain of LED open circuit loss

the connecting way of LED street light at present, the mature application is a single 1 w leds. Obviously, making this a semiconductor light need 50 luminous tube. When all 50 light series or parallel, there will be some problems. If all the leds are in series, if open a light-emitting diode is damaged, the whole lamp is not bright, all of the 50 leds are in series, the driving voltage must be at least 150 volts, reducing the security. If all of them in parallel, and a path open circuit or short circuit, the current imbalance, it will affect the service life of the lamp. According to the characteristics of the drive technology and glowing tube, more luminous tube group should be preferred in series. So, as long as the current drive is given appropriate, all current luminous tube is the same. From the point of view of practical application, as long as the driver is out of control, and flow to the luminous tube current right, luminous tube is rarely appear. But even if the luminous tube failure due to poor quality, it is usually not bright, but it can still keep the path, the other tube is still on. In addition, the luminous tube has a strong ability of over current, for example, 300 ma 1 watt light tube if increase current of 600 ma in a short period of time, will not be damaged. Series, therefore, should be the main mode of using light-emitting tube, the luminous tube is stable and consistent with the current, which is beneficial to improve the life of the lamp. Because there is too much, they are both in series connection, and their driving voltage is too high, so they must be in series and in parallel, so they are in series connection. Special light emitting diode drive is usually a current source. Because leds provide constant current drive, when multiple series-parallel connection, must supplement external flow measures, and provided by the driver of the total current should be evenly distributed to each list. The simplest method is to use a resistance to share current of each string. When several series parallel, each series of light-emitting diodes (leds) main voltage drop should be as consistent as possible, then the resistance should be series to restrain current deviation. If the pressure drop on the group is too large, power consumption will increase, if the pressure drop is too small, flow effect is not good. Generally speaking, the series can take about 5% of the main line voltage drop. Leds lamps cooling way in order to solve the problem of heat dissipation, we mainly rely on the reasonable structure design of lamps and lanterns. The solution is to use a thin metal plate as substrate, the number of leds can be used according to the luminous tube on the aluminum plate with the same as the luminous tube diameter and outer diameter of hole, the distance between two holes is 0. 7 mm, then the luminous tube closely embedded in the metal plate, luminous tube pin connection in the back of the metal plate. Lamp shell is made of metal materials, metal plate and metal case with luminous tube tightly together, so that the heat generated by the lamp work can conduct through the metal plate to the metal shell, metal shell is exposed to the air in the body, the heat by radiation and convection. In order to reduce the volume of the lamp and ensure greater heat dissipation area, the shell of the lamp body can use the fin structure of the ribbed. Manufacturers of solar street lamps, light, solar garden lamp, garden lamp manufacturers, solar led street lamp, street lamp manufacturers, led lights price