This is an era of electrification. Switching power supply is indispensable in our life. As long as there is electricity, there will be a switching power supply. Don’t look at the switch is a very small object. If there is no switch at night, the light will not light up. We will not find the direction, we all know the power switch, but we do not know what its principle is, the following is a small series of the decoration home network to introduce the switching power supply design principles and modules.
First, the working principle of switching power supply design
As the name suggests, switching power supplies use electronic switching devices (such as transistors, FETs, thyristors, etc.), through the control circuit, so that the electronic switching device is constantly "on" and "off", let the electronic switch The device modulates the input voltage to achieve DC/AC, DC/DC voltage conversion, and adjustable output voltage and auto-regulation.
Switching power supplies generally have three modes of operation: frequency, pulse width fixed mode, fixed frequency, variable pulse width mode, frequency, pulse width variable mode. The former working mode is mostly used for DC/AC inverter power supply or DC/DC voltage conversion; the latter two working modes are mostly used for switching regulated power supply. In addition, the switching power supply output voltage also has three working modes: direct output voltage mode, average output voltage mode, and amplitude output voltage mode. Similarly, the former mode of operation is mostly used for DC/AC inverter power supply, or DC/DC voltage conversion; the latter two modes of operation are mostly used for switching power supply.
According to the way in which the switching devices are connected in the circuit, the switching power supplies which are widely used at present are generally classified into three types: a series switching power supply, a parallel switching power supply, and a transformer switching power supply. Among them, the transformer type switching power supply (hereinafter referred to as the transformer switching power supply) can be further divided into: push-pull type, half-bridge type, full-bridge type, etc.; according to the excitation of the transformer and the phase of the output voltage, it can be further divided into: forward type , flyback, single-excitation and double-excited, etc.; if divided into uses, they can be divided into more categories.
Second, switching power supply design module
Switching power supply can be divided into two major categories: AC/DC and DC/DC. The DC/DC converter has been modularized, and the design technology and production process have been matured and standardized at home and abroad, and have been recognized by users, but The modularity of AC/DC, due to its own characteristics, leads to more complex technical and process manufacturing problems in the process of modularization.
Today's soft switching technology makes a qualitative leap in DC/DC. The various ECI soft-switching DC/DC converters designed and manufactured by VICOR in the United States have a maximum output power of 300W, 600W, 800W, etc., and the corresponding power density is (6). , 2, 10, 17) W/cm3, the efficiency is (80-90)%. Japan's NemicLambda Corporation recently introduced a high-frequency switching power supply module RM series using soft switching technology. Its switching frequency is (200~300) kHz, the power density has reached 27 W/cm3, and synchronous rectifier (MOS-FET is used instead of Shaw). The special base diode) is the overall circuit efficiency increased to 90%.
Third, switching power supply repair method
1. When repairing the switching power supply, first use a multimeter to check whether the power components are short-circuited, such as the power rectifier bridge, the switch, the high-frequency high-power rectifier; whether the high-power resistor that suppresses the inrush current is blown. Then check whether the resistance of each output voltage port is abnormal. If the above components are damaged, they need to be replaced.
2. After the first step is completed, it will not work normally after the power is turned on. Then, the power factor module (PFC) and the pulse width modulation component (PWM) should be detected. Check the relevant information and familiarize with the functions of each pin of the PFC and PWM modules. The prerequisites for the normal operation of the module.
The switch is all the parts of all the electronic products in our life. For the electronic equipment, the switch is very important. Then we know the knowledge of the switching power supply design introduced by the above small series, and we will encounter this in the future. We are not well ignorant of the problems. If you still want to know more about decoration consultation, continue to pay attention to the decoration home Internet cafe.
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