Combined with the traditional fluorescent lamp shape, the replacement type LED lamp tube components are divided into: drive design, shell glass selection, plug head lamp, light emitting device, etc..
驱动电路是替换型LED灯管设计的关键，电路的接入模拟传统荧光灯的灯丝。驱动电源由用于降压限流、整流滤波的主电路和具有正常点亮 LED 灯管和保护LED 灯管免受瞬间高压冲击的作用的模拟灯丝电阻电路组成。
The driving circuit is the key to the design of the replacement type LED lamp tube. The circuit is connected to simulate the filament of the traditional fluorescent lamp. The drive power supply consists of the main circuit for the buck current limiting, rectifier and filtering, and the analog filament resistor circuit which has the function of normally lighting the LED lamp tube and protecting the LED tube from the instantaneous high voltage impact.
设计方案包括用于防止灯管因电流过大和 / 或电压过大而损坏的过压过流保护电路，仅在高频电流输入时产生感应电压的频率检测电路，用于将低频交流电或高频交流电转变为无杂波的直流电的整流滤波电路，用于整流滤波电路输出的直流电进行降压以获得LED 日光灯管中的 LED 灯珠组的工作电压的 BUCK 降压电路，用于屏蔽所述的 BUCK 降压电路中的 PWM 开关电路以直接控制所述的 BUCK降压电路工作的高频直通电路；
The design scheme includes to prevent tube due to excessive current and / or voltage is too large and the damage of over-voltage and over-current protection circuit, frequency detection circuit only generates induction voltage at high frequency current when the input is used for converting alternating current or low frequency, high frequency alternating current for clutter free DC rectifier filter circuit, BUCK circuit of Buck in order to obtain the LED fluorescent lamp in the LED lamp group working voltage for DC output rectifier filter circuit, high frequency BUCK circuit for PWM switching circuit, BUCK circuit and the shielding in the direct control of the direct circuit;
所述的过压过流保护电路的输入端接入市低频交流电或电子镇流器输出的高频交流电，所述的过压过流保护电路的输出端与所述的频率检测电路的输入端连接，所述的频率检测电路的一个输出端与所述的整流滤波电路的输入端连接，所述的频率检测电路的另一个输出端与所述的高频直通电路的输入端连接，所述的整流滤波电路的输出端与所述的BUCK 降压电路的输入端连接，所述的高频直通电路的输出端与所述的 BUCK 降压电路的控制端连接，所述的 BUCK 降压电路的输出端与 LED 日光灯管中的LED 灯珠组连接。
The high frequency alternating current overvoltage and overcurrent protection circuit of the input or output, low frequency alternating current electronic ballast, frequency detection circuit and the overvoltage and overcurrent protection circuit and the output end of the input end of the connection, an output end of the frequency detection circuit and the rectifying filter circuit the input end is connected with the high frequency, and another output end of the frequency detection circuit and the direct circuit connected to the input end, output end of the rectifying filter circuit and the BUCK circuit is connected to the input end of the frequency control, through BUCK circuit and output circuit the end of the connection, LED lamp group BUCK output end of the step-down circuit and LED fluorescent lamp in connection.
Performance requirements of glass tubes for 1.2 and LED straight tube lamps
The performance of straight tube type LED lamp shell glass mainly includes appearance effect, light transmittance, fog degree, temperature and humidity resistance, moisture resistance, hardness, conductivity, expansion rate, bending degree, and the parameters of the whole light and color.
Key indicators are as follows:
Appearance effect: the color is milky white, smooth surface, no bubbles, no scratches, no miscellaneous points, etc.;
The light transmittance: Measurement and calculation method, the transparent glass tube and milky white glass tube with a light source at the specified voltage power respectively to the same specifications, with integral ball test the photoelectric color parameter test, milky white and transparent light transmittance ratio, usually light transmittance requirements in more than 92%;
Fog degree: the matched light source is placed in the glass tube, the lamp is lighted under rated voltage and power, and the luminous point (lamp beads) can not be seen. The whole glass tube has uniform fog degree and the same luminous performance, and no obvious difference between light and shade;
Temperature resistance: the glass tube is placed in a 150 C high temperature chamber, and after 200 hours, there is no color change, no burst, no deformation and other abnormalities;
Water resistance: the glass is placed in a constant temperature water bath at 60 degrees, after 24 hours, no color change, no burst, no deformation and other abnormalities;
The expansion coefficient of Volatility: the same batch of glass tube expansion coefficient fluctuation control requirements in + 1 * 10-7/ c;
The conductive glass tube outer wall were not conductive;
The effect of light color: milky white glass tube with transparent glass tube with a light source test set parameters, spectrum, color temperature, color rendering index does not have obvious difference;
9 hardness: T8 glass as an example, the vertical pressure gauge General requirements more than 300N by general glass pressure, specific to each manufacturer customer shall prevail.
The bending degree: T8-1.2 meters long glass tube as an example, the general requirements of not more than 3 degrees bend.
In the above performance, light transmittance, fog degree, temperature resistance, humidity resistance, light color influence is the most manufacturers pay more attention to.
1.3, lamp design
The replacement type LED lamp tube mainly consists of plug head 1, end circuit board 2, power supply drive, light emitting module 3 and shell glass tube 4. Light emitting module substrate materials and SMD LED lamp, LED lamp will be evenly distributed in the middle part of the substrate.