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List of Questions

Question

How to debug the switching power supply circuit

Answer

The input and output of the power circuit are connected to the board through a low-resistance high-power resistor, so that in the case of no soldering resistor, the power circuit can be debugged first, avoiding the influence of the latter circuit.

 

Generally speaking, the switch controller is a closed-loop system. If the output deteriorates beyond the range that the closed-loop can control, the switching power supply will not work properly. In this case, the feedback and sampling circuits need to be carefully checked. It is important to note that if a large ESR output capacitor is used, a lot of power supply ripple will occur, which will also affect the operation of the switching power supply.

Question

How to choose the right components and parameters for the switching power supply circuit

Answer

Many engineers who have not used switching power supply design will have certain fears, such as concerns about switching power supply interference, PCB layout problems, component parameters and type selection issues. In fact, as long as you understand, using a switching power supply design is very convenient.

 

A switching power supply typically consists of a switching power supply controller and an output. Some controllers integrate the MOSFET into the chip, which makes it easier to use and simplifies PCB design, but the design flexibility is reduced.

Question

How to choose the right power supply implementation circuit

Answer

According to the specific technical indicators obtained by analyzing the system requirements, it is possible to select a suitable power supply realization circuit. The general weak current part includes an LDO (Linear Power Converter), a switching power supply capacitor buck converter, and a switching power supply inductor-capacitor converter.

Question

How to evaluate the power requirements of a system

Answer

For an actual electronic system, carefully analyze its power requirements. Not only the input voltage, output voltage and current, but also the total power consumption, the efficiency of the power supply, the transient response of the power supply to the load change, the tolerance of the critical components to the power supply fluctuations, and the corresponding allowable Power ripple, heat dissipation issues, and more.

Question

Non-inductive resistance purchase

Answer

The purchase always requires the most appropriate, we want to be non-inductive, the most important is the resistance, as well as the consistency and stability of the use of the product. At the same time, non-inductive resistance is a large amount of heat generated during load. Good heat dissipation is an important parameter. If the product requires high volume, it is not suitable for large-volume such as wire-wound resistor.

Question

Automotive Relays - Output Parameters

Answer

Load Type Most of the domestic relay load capacity, only the maximum pure resistive load, which gives the user two misunderstandings when selecting the relay load, resulting in the selection error.

Question

Phototransistor - working principle

Answer

The structure of the phototransistor is similar to that of a triode. The difference is that the phototransistor must have a light-sensitive PN junction as the photosensitive surface. Generally, the collector junction is used as the light-receiving junction. Therefore, the phototransistor is essentially equivalent to a photodiode connected between the base and the collector. Ordinary triode.

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