The material in this eBook also appears in the print version of this title: has over 46 years of experience in switch-mode power supply design. Editorial Reviews. From the Back Cover. The bestselling reference--packed with essential new eBook features: Highlight, take notes, and search in the book. Recommended Electronic Repair E-Books Switch mode power supplies have gained much popularity since in the beginning of 80's .
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Switchmode Power Supply Handbook 3/E (3rd ed.) by Keith Billings. Read online , or download in secure PDF or secure EPUB format. here is the link for some E-book- osakeya.info osakeya.info in the Switch−Mode Power Supply Reference Manual should prove useful. It also provides real SMPS examples, and identifies several application notes and.
In addition, do not assume that the chassis is a suitable ground for your test equipment! If circuit boards need to be removed from their mountings, put insulating material between the boards and anything they may short to. Hold them in place with string or electrical tape. Prop them up with insulation sticks - plastic or wood.
In a TV or monitor, if you are removing the high voltage connection to the CRT to replace the flyback transformer for example first discharge the CRT contact under the insulating cup at the end of the fat red wire. Use a 1MM ohm 1W or greater wattage resistor on the end of an insulating stick or the probe of a high voltage meter.
Discharge to the metal frame which is connected to the outside of the CRT. An implosion will scatter shards of glass at high velocity in every direction. There is several tons of force attempting to crush the typical CRT. Always wear eye protection. Use clip leads or solder temporary wires to reach cramped locations or difficult to access locations.
Clip the reference end of the meter or scope to the appropriate ground return so that you need to only probe with one hand. It may be possible to perform some of the tests at greatly reduced voltage e. This would greatly reduce the shock hazard as well as equipment damage from a slipped probe or missed faulty component.
Perform as many tests as possible with power off and the equipment unplugged. For example, the semiconductors in the power supply section of a TV or monitor can be tested for short circuits with an ohmmeter. Use an isolation transformer if there is any chance of contacting line connected circuits. A Variac tm is not an isolation transformer! The use of a GFCI Ground Fault Circuit Interrupter protected outlet is a good idea but will not protect you from shock from many points in a line connected TV or monitor, or the high voltage side of a microwave oven, for example.
Note however, that, a GFCI may nuisance trip at power-on or at other random times due to leakage paths like your scope probe ground or the highly capacitive or inductive input characteristics of line powered equipment. A fuse or circuit breaker is too slow and insensitive to provide any protection for you or in many cases, your equipment. However, these devices may save your scope probe ground wire should you accidentally connect it to a live chassis.
Don't attempt repair work when you are tired. Not only will you be more careless, but your primary diagnostic tool - deductive reasoning - will not be operating at full capacity.
Finally, never assume anything without checking it out for yourself! Don't take shortcuts! Tips on SMPS troubleshooting The diagnosis of problems in switchmode power supplies is sometimes made complicated due the interdependence of components that must function properly for any portion of the power supply to begin to work. Depending on design, SMPS may or may not be protected from overload conditions and may fail catastrophically under a heavy load even when supposedly short circuit proof.
There is particular stress on the switching devices they are often V transistors which can lead to early or unexpected failure.
Also, SMPS may fail upon restoration of power after a blackout if there is any kind of power spike since turn-on is a very stressful period - some designs take this into account and limit turn on surge. However, the cause of many problems are immediately obvious and have simple fixes - the blown chopper transistor or dried up main filter capacitor. Don't assume your problem is complex and convoluted. Most are not. You should not avoid attempting a repair just because there is a slight chance it will be more challenging!
A low power e. A higher power iron or small soldering gun will be needed for dealing with larger components. Never use acid core solder or the type used for sweating copper pipes! If in doubt, find someone else to do the soldering or at least practice, practice, practice, soldering and desoldering on a junk circuit board first! See the document: Troubleshooting and Repair of Consumer Electronic Equipment for additional info on soldering and rework techniques.
These alone will suffice for most diagnosis of faulty components like shorted semiconductors or open fusable resistors. Since everything runs at a relatively low frequency, almost any scope will do. Incredibly handy widgets These are the little gadgets and homemade testers that are useful for many repair situations. Here are just a few of the most basic: Series light bulb for current limiting during the testing of TVs, monitors, switching power supplies, audio power amplifiers, etc.
I built a dual outlet box with the outlets wired in series so that a lamp can be plugged into one outlet and the device under test into the other. For added versatility, add a regular outlet and 'kill' switch using a quad box instead. The use of a series load will prevent your expensive replacement part like a switchmode power transistor from blowing if there is still some fault in the circuit you have failed to locate. Now, if I would only remember to do this more often!
See the section: The series light bulb trick. A Variac. It doesn't need to be large - a 2 A Variac mounted with a switch, outlet and fuse will suffice for most tasks. However, a 5 amp or larger Variac won't hurt. By varying the line voltage, not only can you bring up a newly repaired monitor gradually to make sure there are no problems; you can also evaluate behavior at low and high line voltage.
This can greatly aid in troubleshooting power supply problems.
Functional requirements of direct off-line switchmode power supplies Power components selection and transformer designs for converter circuits Transformer, choke, and thermal design Input filters, RFI control, snubber circuits, and auxiliary systems Active power factor correction system design Worked examples of would components Examples of fully resonant and quasi-resonant systems A resonant inverter fluorescent ballast An example of high-power phase shift modulated system A new MOSFET resonant inverter drive scheme A single-control, wide-range wave oscillator.
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Dispatch time The time it takes to verify the order, complete invoicing, prepare your item s and dispatch. And then it is fed to a step-down transformer which is comparable to the weight and size characteristics of a transformer unit of 50Hz. The output of the step-down transformer is further fed into the rectifier. This filtered and rectified output DC power is used as a source for loads, and a sample of this output power is used as a feedback for controlling the output voltage.
With this feedback voltage, the ON time of the oscillator is controlled, and a closed-loop regulator is formed.
As shown in the circuit above, the switch is driven by the PWM oscillator, such that the power fed to the step-down transformer is controlled indirectly, and hence, the output is controlled by the PWM, as this pulse width signal and the output voltage are inversely proportional to each other. It is converted into DC by rectification process using a rectifier and filter. This unregulated DC voltage is fed to the large-filter capacitor or PFC Power Factor Correction circuits for correction of power factor as it is affected.
This is because around voltage peaks, the rectifier draws short current pulses having significantly high-frequency energy which affects the power factor to reduce. So, the combination of the rectifier and filter, shown in the block diagram is used for converting the AC into DC and switching is done by using a power MOSFET amplifier with which very high gain can be achieved.