11条学会dc-dc电源变换（11 learn DC-DC power conversion）.docVIP

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11条学会dc-dc电源变换（11 learn DC-DC power conversion）.doc

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11条学会dc-dc电源变换（11 learn DC-DC power conversion）

11条学会dc-dc电源变换（11 learn DC-DC power conversion） First, to understand how power DC/DC Also known as the DC/DC power supply circuit DC/DC conversion circuit, the main function is to input and output voltage conversion. We put the input voltage in the voltage transformation process within 72V called DC/DC conversion. The common power supply consists of vehicle and communication series and general industrial and consumer series, using the voltage of the former is generally 48V, 36V and 24V, which is used by the general power supply voltage below 24V. Different rules in different fields, such as PC, 5V is commonly used in 12V and 3.3V, simulation of commonly used 5V circuit power 15V, digital circuit commonly used 3.3V, now FPGA, DSP also used voltage below 2V, such as 1.8V, 1.5V, 1.2V etc.. In a communication system called the two power, which is composed of a DC power supply or battery provides a DC input voltage, the DC/DC transform was after one or several of the DC voltage at the output end. Second, need to know the DC/DC conversion circuit classification The DC/DC conversion circuit is mainly divided into the following three categories: The zener voltage stabilizing circuit. The linear voltage regulator circuit (analog). The switching regulator circuit Third, the most simple regulator circuit design Zener voltage regulator circuit has simple circuit structure, but lower load capacity, output power is small, generally only provides a reference voltage for chip, do not use power. More common is the shunt regulator circuit, the circuit diagram as shown in figure (1), Choose the regulator generally according to the following formula: (1) Uz=Vout estimation; (2) Izmax= (1.5-3) ILmax (3) Vin= (2-3) Vout, the circuit structure is simple and can suppress the input voltage disturbance, but due to the zener maximum working current limit, while the output voltage can not be adjusted, so the the circuit adapted to output voltage without adjusting, the load current is small, le