2012年10月24日
Switching power supply notes
Switching power supply notes about selection and use
(1) The appropriate choice of input voltage specifications;
(2) Select the appropriate power. In order to make the growth of the power of life, the models suggested the use of more than 30% of the rated output power. For example, if the system requires a 100W power supply, it is recommended that the selection of greater than 130W output power rated models, and so on can effectively enhance the power of life.
(3) to consider the load characteristics. If the load is a motor, light bulb or capacitive load current when instant boot, should choose a suitable power supply in order to avoid overload. If the load the motor voltage shutdown intrusion should be considered.
(4) In addition, the need to consider the power of the working environment temperature, and the presence of additional auxiliary cooling equipment, excessive ambient temperature power derating output. Ring temperature output power derating curve
(5) Depending on the application required to select the functions: protection functions: over-voltage protection (OVP), over-temperature protection (OTP), overload protection (OLP).Application functions: signaling functions (normal power supply, power supply failure), remote control functionality, telemetry function, parallel functions. Special features: power factor correction (PFC), constant electrical (UPS)
(6) to select the desired line with safety regulations and electromagnetic compatibility (EMC) certification.
Note switching power supply
(1) Use the power, make sure that the input and output voltage specifications with the nominal value of the power used to match
(2) before turning on the power, check the input and output leads are connected correctly to avoid damage to the user equipment.
(3) Check the installation is solid, with or without contact, mounting screws and power board devices measuring shell input, output insulation resistance, in order to avoid electric shock
(4) in order to ensure the use of safety and reduce interference, please ensure reliable grounding ground
(5) multi-output power supply is generally divided into primary and secondary output, the main output characteristics superior to the auxiliary output, the output current of the main output of the general case. Generally requires every road in order to ensure the output load regulation and output dynamic indicators, with at least 10% of the load. Use side roads without the main road, the main road must add the appropriate dummy load. Refer to the specifications of the corresponding models.
(6) Note: The the Frequent power switch will affect their life.
(7) working environment, and the degree of load will affect their life.
Why power use will crash, reopen and again after shutdown?
Generally caused by the use of the power supply in the crash reason about both cases, the first load instantly overload caused by the overload protection, it is recommended to upgrade the power supply output power or modify the design of load; second temperature is too high, over temperature protection phenomenon. The above happens will power crashes into protection state conditions are removed before turning on power can be restored to normal.
