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Overview
Essential details： IS400JPDDG1A GE DC POWER DISTRIBUTION CARD
First, switching power supply: It is a high-frequency electrical energy conversion device, which mainly uses power electronic switching devices (such as transistors, MOS transistors, controllable thyristors, etc.), through the control circuit, the electronic switching device periodically “on” and “off”, so that the power electronic switching device pulse modulation of the input voltage, so as to achieve voltage conversion and output voltage can be adjusted and automatic voltage regulation function.
Advantages of switching power supply: ① Low power consumption, high efficiency. ② Small size, light weight. ③ Wide range of voltage regulation.
Source of switching power loss: ① switching tube loss. ② inductance and capacitance loss. ③ secondary tube loss.
Loss analysis of switching power supply: The efficiency of switching power supply can reach more than 90%, if carefully optimized and designed, and even can reach more than 95%, which is very important in the occasions where the battery is used as a power source, such as mobile phones, small drones, etc. Therefore, the design of the switching power supply will directly affect the endurance of the equipment.
(1), switching tube loss: this is the main loss of switching power supply, mainly including switching loss, conduction loss. Therefore, the switching tube with relatively small on-resistance should be selected as the core component of the switching power supply.
(2) Inductance capacitance loss: inductance loss mainly includes DC resistance loss, capacitance loss mainly includes leakage current loss. Therefore, we should try to choose capacitor components with small DC resistance and small leakage current.
(3) Diode loss: mainly includes on-off loss and switching loss. Therefore, we should try to choose diodes with small on-voltage drop and short reverse recovery time, such as Schottky diodes or fast recovery diodes.
IS215UCVHM06A IS415UCVHH1A B VET2-A21010 350-9300007672-12F010 A1
Second, the classification of switching power supply:
According to the different modulation methods can be divided into pulse width modulation (PWM) and pulse frequency modulation (PFM) two kinds, pulse width modulation (PWM) in the switching power supply occupies a dominant position.
According to the connection mode of the pipe can be divided into series switching power supply, parallel switching power supply and transformer switching power supply three categories.
According to the different output voltage can be divided into buck switching power supply and boost switching power supply two kinds.
According to the input and output types, there are four types: AC-AC, DC-AC, AC-DC, and DC-DC. The following describes the DC-DC.
According to whether there is electrical isolation can be divided into isolated switching power supply and non-isolated switching power supply two.
Three basic topologies of switching power supplies (mainly non-isolated) :
DC/DC converters generally include two basic operating modes: inductive current continuous mode (CCM) and inductive current intermittent mode (DCM).
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