Q:Led lights switching power supply controller how to repair

Common faults and maintenance techniques for switching power supplies 1. Fuse blown: In general, the fuse blown on the power of the internal line is a problem. Because the power supply in the high voltage, high current state, it will cause the power supply current instantaneous increase and let the fuse blow. Maintenance Tips: Check the power input of the rectifier diodes, high voltage filter electrolytic capacitors, inverter power switches and other components are not breakdown, open circuit and damage. But also to see the various components on the circuit board to see whether the appearance of these components without burning paste, with or without electrolyte overflow and so on. 2. No DC voltage output or voltage output instability: the main power of a short circuit, open circuit phenomenon, then the power load is too heavy, high-frequency rectifier filter circuit rectifier diode breakdown, filter capacitor leakage and so may cause this Happening. Maintenance techniques: first with a multimeter to measure the secondary original, excluding high-frequency rectifier diode breakdown, load short-circuit situation, if this time the output is zero, then you can certainly be the power of the control circuit is a problem. Then you can use the static measurement of the corresponding components to check out the damaged components.

Q:Switching power supply start-up time, hold time, long time, fall time, which standard

Rise time: the output voltage from 10% to 90% of the time, the rise time is generally less than 50ms, too long may cause the machine malfunction. Hold time: After the input power is turned off, the output voltage is maintained with 90% of the specification time.

Q:Switching power supply

Switching power supply is usually divided into AC / DC, DC / DC, DC / AC and other types. Popular is to convert a voltage into a specific voltage for the needs of electrical equipment. Such as car switching power supply is the car's 12V DC voltage into 5V or other voltage for the use of equipment. Commonly used mobile phone charger (also switching power supply), computer power and so are switching power supply.

Q:Switching power supply OLP and OCP these two are the same concept?

Not the same concept. OCP is overcurrent protection, many electronic devices have a rated current, not allowed to exceed the rated current, or will burn out the equipment. OLP is overload protection, to prevent the main power lines due to overload caused by overheating protection and installation of overload protection equipment.

Q:I bought a 3C certification 12V 500mA power adapter, I use 15 ohm 5W resistance to measure the voltage (12V, current 800mA) supposedly the specification is 500mA, more than 600mA should be protected, but why will show 800mA The The In addition, I use 10 ohm resistance to measure it to protect, is not the way I measured is not so measured? Or is this power adapter not 12V 500mA specification but 12V 1A? The The Solve? The Seek test method The

Some set 1.2 times, 1.5 times, there are 2 times. The reason is to prevent the instantaneous impact of the current so that the power supply malfunction.

Q:What is the linearity of switching power supply

Linear adjustment rate for the input voltage maximum and minimum output voltage stability indicators, but this provision has a number of standards to 220V, for example, if you specify a maximum of 264, the minimum is 185V, Vof said full load when the output voltage, there are three algorithms : The algorithm is as follows: ??? ATE which in the end with which one, you will test the report out to count about. I used to use the CHROMA6000, which is the formula inside the dead, but CHROMA8000 as if you can modify their own. For only a set of outputs, there is a LOAD REGULATION is the load regulation rate, Von said no load when the output voltage, the algorithm is as follows: ???? Respectively, called the normal voltage load regulation, high pressure load regulation, low voltage load regulation. When there are multiple sets of output, one or more of the output with overloaded but no load output increases due to the increase in duty cycle, relative to the original increase in the number of cross-load regulation is called Accuracy range, because each group must be set at least once overload or light load to observe the other output of the situation, so called cross adjustment.

Q:What is the power of the switching power supply?

Of course, abroad is the Siemens ah, is the price is more expensive, Ming Wei fake too much, Bingbu not bad, the quality did not say

Q:Switching power supply how maintenance

Check whether the input, and then check the switch control circuit part, and finally the power drive sector.

Q:What is the component stress in the switching power supply?

Component stress is the element in the worst working conditions of the environment, for component reliability, the actual consideration of the main voltage stress and thermal stress. General companies set their own derating standards, the use of components in the stress can not exceed the established standards in order to obtain improved reliability.

Q:A DC / DC switching power supply input with UC3843 is a 24V power supply between two power supplies is up to 200M line now the situation is DC / DC power supply at no time when the load is measured at this time DC / DC power input It is actually less than 15V if the DC / DC power supply is loaded with about 10W and the 24V power supply output is adjusted to 27V or more when the DC / DC power supply is working In front of the wrong In the load when the 10W when the front power output is adjusted to 27V measured when the power input voltage is 14.5V or so when the no-load time is normal add another point With 10W when the front of the power output is adjusted to 27V below the two power between the current is significantly increased at this time into the DC / DC power supply voltage from 15V down to 6,7V looks more like the back of the power from Excited and DC / DC of this power supply in the 9V or so input conditions can work properly

DC power supply inside the capacitor caused by leakage can not bring the load, I have previously repair, replace the filter capacitor to solve the problem. Leakage, can only replace, you add more capacitors is useless.