1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0. 1uf & 47uf parallel capacitor.
3. Tolerance: includes set up tolerance, line regulation and load regulation.
平安彩票The unisolated converter is the simplest switched power structure, and its power conversion mode is "dc-dc" conversion. According to the type of voltage conversion, it is divided into three basic types: The structure of the Buck Chopper, Buck Chopper, and buck-boost Converter is very similar. Input, output, and ground converge at one point. Inductors are used for energy storage. The main difference between them lies in the connection mode of inductors. If inductors are placed at the output end of the circuit, it is a step-down chopper topology. An inductor placed at the input end of the circuit is a boost chopper topology. When the inductor is connected to the ground, it is a step-boost chopper topology. Due to the structure similarity, therefore tend to change these simple circuit topology of some components in the input polarity connection or change, can be another converter topology, such as a 12 v input, 5 v output buck chopper output can be the original grounding and from the ground in the new output for a 7 v input, - 5 v output of the buck - boost chopper.
By buck - boost chopper circuit, also spawned buck chopper circuit, Cuk, SEPIC and ZETA and other non isolated dc-dc transform circuit, the SEPIC converter and ZETA converter are Ć UK small reset of the converter. According to the load demand, the combination of basic boost chopper circuit and basic drop chopper circuit can form a compound chopper. For the same basic chopper circuit, a multi-phase chopper can be constructed to meet the higher stability and efficiency of the load on the power supply. In recent years, there has been a charge pump converter circuit which only USES capacitor as energy storage element. Another neutral point topology is used for power supply and active filter.
The efficiency of switching devices will decrease when the pulse duty ratio is very short. If higher values of voltage transformation are required, then isolated topology with transformer is required.
平安彩票The following table provides an overview of non-isolated topology types. In the table, "D" is the duty ratio of the pulse triggered by the converter, and the value is between 0 and 1. The input voltage (V1) is assumed to be much larger than 0; If there is no input voltage, there is no output voltage (V2).