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Provide engineers understand the basic knowledge of switch power supply technology, so in the first few chapters, detailed analysis of the switching power supply circuit topology knowledge, core components design knowledge, and form a stable system control theory knowledge, but it is true as you know, the reality of the power supply circuit is not only the trunk, but there are many branches and auxiliary parts, because their contribution to the whole complete circuit is self-evident, this chapter is to these seemingly simple auxiliary circuit is introduced, in the hope to help readers understand the integrity of the switch power supply knowledge,
Section 1 through a synchronous buck circuit examples, for everyone is most familiar with input and output capacitance design, select the theoretical derivation, capacitance, although simple, but as a result of participation in the state of the power circuit and become quite complex in the process of transformation,
To continue in the second quarter of the full-wave bridge rectifier electrolytic capacitor design, through theoretical analysis, choice and times is relatively long history type pressure input capacitance in circuit also made a detailed analysis of the ripple voltage and capacitance of the capacity of the capacitor value relations are fully explained in this section,
The third section is the current electric power electronics power factor correction (PFC) circuit for a review, from the origin of PFC, PF/THD definition and the request of the laws and regulations, the introduction of the most commonly used BOOST power factor correction circuit, under different control mode and its advantages and disadvantages are given clear instructions, in order to make up for the BOOST PFC and expand the application scope of PFC, the deficiency of the average current mode control under the CCM, transition mode control, and staggered power factor correction, no bridge of the power factor correction circuit described respectively, readers can clearly understand to the respective basic circuit topology, performance, at the same time, the author also synchronous tracking the new technological frontier, a buck for common LED lighting field and has high power factor circuit, in a word, through this section, to the whole history of PFC circuit, the status quo can have a complete qualitative understanding,
The fourth quarter to start portion of the power circuit, auxiliary power supply design, soft start circuit design were analyzed, it is the basic circuit of power supply designers face every day,
Section 5 introduces the clamp in the power circuit, absorbing circuit, such as RC absorption, RCD absorption, CCM PFC active clamp technique, and the design of the RC absorption circuit gives theoretical guidance,
Section 6 for a special kind of circuit, the charge pump charging circuit are analyzed, and the circuit inside the chip design is widely used, because of its simple circuit principle, bootstrap power supply, can realize highly integrated chip, this circuit in low current applications and promising,
This chapter is far from will encompass all of the auxiliary switch power supply circuit, but its guiding significance lies in the hope that readers understand the support part of the actual circuit, through the flexible use of the auxiliary power circuit, the lines, integration into the new power supply design,