1, Shenzhen Luming core Semiconductor Lighting Technology Co., Ltd. is a focus on LED since its inceptionLighting drive solutions and components supply enterprises. Innovative LED driver products cover DC 0V~450V, AC 85V~265V wide input voltage range (isolated/non-isolated), to achieve LED lighting drive power from 1 watt to tens of watts of high efficiency complete solutions.
LED drive power supply is to convert the power supply into a specific voltage and current to drive LED light power converter, usually LED drive power inputIncluding high-voltage power frequency AC (i.e. mains), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformers). The output of the LED driver power supply is mostly a constant current source that can change the voltage with the change of the LED forward voltage drop value.
Generally, the typical operating current of 1W high-power LED is 350mA, if RFB is equal to 1 ohms, the power consumption of RFB is: PRFB=I2*R=0.352*1=0.12W (4) Considering the power consumption of the operational amplifier itself, the power consumption of RFB and its affiliated circuits is about 1W LED powerTwelve percent.
. Non-isolated constant current power supply: Non-isolated means that there is a direct connection between the load and the input end, so there is a risk of electric shock when touching the load. At present, the most used non-isolated direct step-down power supply. That is, after the AC is rectified, the DC high voltage is obtained, and then the Buck circuit is directly used for buck and constant current control.
Figure 1 is the EMI circuit, but this circuit has another function. Many switches in foreign countries will connect a neon bubble in parallel. When the switch is turned off, this neon bubble will be bright, and R17, R21 and CX1 in this circuit will generate tiny electricityThe current skips the power supply to the neon bubble. If these elements are not used, the LED light may flash after the light is turned off with a switch with the neon bubble.
2, can be series. The life of course has an impact, the lowest life of the battery determines the life of the entire battery pack. So try to buy the same batch, internal resistance, self-discharge rate of the same battery.
3, we want to tell consumers high-power booster chip : electric vehicles if there is no special or built-in power generation control technology, the electricity emitted is unable to charge the battery.
4, electric car charger Taobao cheap quality is not the same. Taobao electric car charger is indeed much cheaper, but the quality can not be guaranteed. The good quality charger output voltage control is accurate and stable, the output current is large, the heat is relatively small, there is protection function, the charger is not bad, and the electric vehicle is not bad. The performance of the electric vehicle charger is directly related to the charging effect, the battery life, and the safety of the vehicle.
The most efficient high-power booster chip is DCDC. STM32F series belongs to the low-end 32-bit ARM microcontroller high-power booster chip , this series of chips is produced by ST company, its core is Cortex-M3. This series of chips can be divided into three parts according to the size of the Flash on the chipClass High power booster chips : small capacity (16K and 32K), medium capacity (64K and 128K), large capacity (256K, 384K and 512K).
First, prepare a 12v lead-acid battery charger and a DCDC adjustable voltage module. Then, the input end of the board is connected to the battery and the knob is adjusted so that the output voltage is 2V. Finally, the output terminal can be connected to the input terminal of the original lithium battery.
The standard supply voltage of the control chip 89C51 is 5V, with the option of using a linear voltage regulator core