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What Is the Voltage of the LED Power and Its Basic Drive Circuit?

The original power supply of LED power supply has three important types: low -voltage batteries, solar cells, and communication market power supply. No matter which original power supply is accepted, the prerequisite for the power change to be satisfied with the LED. This type of power transformation circuit generally means the LED drive circuit. In the LED solar power supply system, batteries or ultra -supercapacitors are needed to store solar energy. When lighting at night, batteries or supercapacitors are then discharged through the process of controlling the circuit to power the LED drive circuit. The union of solar energy and wind energy and LED is the one -year highlight of LED. It will bring light to the poverty and remote regions of the third world, and let the glorious green lighting illuminate every corner of the world. LED power supply and their basic driving circuit design 1. LFD driver circuit with low voltage DC power supply 1. When the input voltage is higher than the LED voltage, when the input voltage is higher than the voltage of the LED or LED string Antihypertensive regulator. (1) Linear regulator linear regulator is a DC-DC antihypertensive converter. Most of the linear regulators accepted by the LED drive circuit are low -voltage differential regulators (LDO). The strengths are that there is no need for inductance components, the number of required components is small, EMI infertility occurs, and its own voltage drop is lower than the force to lower the force than the force. However, compared with the switch -type regulator, the power loss of the LDO is still relatively old, and the efficiency is lower. When LDO drives 350mA or above power LED string, it needs to be added with a radiator. (2) The switch -voltage voltage (buck) stabilizer is based on the switch -type antihypertensive regulator of a single -chip -specific IC. Many antihypertensive regulator switching frequency is more than 1MHz, which makes the external components very small. The entangle is very small, with an efficiency of more than 90%. However, this type of converter will give birth to switching noise, and there is an EMI problem. Figure 1 shows the 3WLED boost drive circuit based on Zetex ZXSC300. The RCS here is the electrical transmission sensing resistance. Under the input voltage of 6V, the current LED current reaches 1.11A.ZXSC300 to accept 5 pins SOT23 packaging. The LED power supply and its basic driving circuit design currently has many antihypertensive transformers single -chip ICs to switch the switch MOSFET (Q1) and the antihypertensive diode (D1). 2. When the input voltage is lower than the LED voltage, when the input voltage is lower than the general positive voltage voltage of the LED or LED string, the LED needs to increase the voltage drive circuit. There are two types of booster converter in the following two types. (1) Direct pressure converter In the mobile phone violation lighting, the inductive voltage voltage LED driver circuit is often used. The switch -type inductance boost converter is used as a LED string of one or more LED composition, and the current of each LED is equal. If there is a LED road in the LED string, other LEDs will go out. Figure 2 shows the inductive voltage LED drive circuit. The LED string is composed of the NSPW500BS white light Ledled lamps of the NSPW500BS type of 8 Japan Asia Chemical Corporation. Under the 4V input voltage, the current of each LED is about 25mA per LED. The LED power supply and its basic driving circuit design mostly boosts the regulator IC, and the switching tube is integrated in the chip. (2) The switch capacitor (charge pump) boost converter switch the capacitor voltage voltage converter, that is, the charge pump. The special IC of the charge pump has a built -in switch, which is connected to 1 or two 1μF's charging capacitor. There are 1×, 1.5×2×In recent years, it has shown 1.33×(4/3 times) and 4×model. When the output voltage is close to the input voltage, the charge pump does not need to increase the voltage, that is, at 1×Model. When the pressure is needed, switch to 1.5×Or other things. The charge pump circuit can drive the LED array, or only one LED.

What Is the Voltage of the LED Power and Its Basic Drive Circuit? 1

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