Talk about the "obstacles" on the road to power supply upgrade

okhxyyo

Talk about the "obstacles" on the road to power supply upgrade [Copy link]

From learning about power supplies to designing a power supply, from being a power supply novice to a technical expert...how many obstacles have you overcome along the way to becoming a power supply expert? ? ?

Let's talk about what problems you have encountered in the process of upgrading power supplies and what impressed you most? Or, what pitfalls have you encountered in the actual practice of designing power supplies? Or what problems are common for novices to encounter and how to avoid them? ?

Everyone is welcome to share how you overcame the obstacles you encountered on the road to growth.

From now (May 26, 2020) to June 25, 2020, you are welcome to post in the forum [Power Supply Section] with the title "Power Supply Roadblock" + subtitle to share the problems and solutions you have encountered in power supply design, or the design details that are easy to appear or overlook in power supply design.

After the event, the

The most helpful practical experience award x5	Remax double-layer car umbrella (1~2 persons); wireless charger (3~5 persons)
Most likely to make mistakes award x5	Xiaomi Mi Band 3 (1st to 2nd place); Aicos Magic Glass (3rd to 5th place)

shihuntaotie

Double-decker bus

okhxyyo

shihuntaotie posted on 2020-5-26 11:10 Double-decker bus

kaokaohe

Support the event!

yichun417

It's not limited to switching power supplies, right?

okhxyyo

yichun417 posted on 2020-6-4 09:10 It is not limited to switching power supplies, right?

No restrictions

qqrabbit

The most common one is the small capacitor in the switching power supply and the DCDC power supply fedback circuit, which is connected with the resistor. On the power IC of Silergy, the capacitance of this capacitor needs attention. Some capacitors are too large and some are too small.

okhxyyo

qqrabbit published on 2020-6-8 11:09 The most common one is the small capacitor in the switching power supply, DCDC power supply fedback circuit, which is connected with the resistor. On the power IC of Silergy, this capacitor is connected with the resistor.

Posting~~ not in this post

亨乾电源模块

The three traditional problems of switching power supplies: EMC, loop response, and magnetic analysis.

EMC involves many aspects: component parameters (not the parameters of the filter circuit), PCB design, electromagnetic coupling (shielding, grounding, etc.), and buffer absorption circuits.

To be good at loop response, you need to be able to do loop calculation and simulation. If you can't find a ready-made formula for something, you have to derive it yourself, which means you must at least be able to do s-domain analysis and calculation. If you don't know differential equations, this process will be very difficult. Some time ago, I found some information, including a lot of English ones. It's good enough to give a conclusion. There is no derivation process in all of them, and they are all approximate results. You don't know which items are omitted. When your circuit changes a little bit, you don't know whether these items can still be omitted. As for Chinese, I haven't seen anyone derive the right half plane zero of flyback from the formula. There must be many people who can derive it, but there is no information released online.

As for the calculation of topological structures and inductor-capacitor filter circuits, they are child's play in comparison.

It is easy to get started with power supplies. You can probably get it working by copying a circuit, but it is not easy to make sure all performance indicators meet the standards.

soso

Hengqian Power Module Published on 2020-7-6 17:18 The three traditional problems of switching power supply: EMC, loop response, and magnetic analysis. EMC also involves many aspects: component parameters (not the parameters of the filter circuit) ...

Can EMC show off its research results?