Author Archive

American 3 pin plug

Type B Electrical Outlet (American 3 pin Plug) Type B Electrical Receptacle Countries Using Type B Electric Plug Information on the Type B American 3-pin Electrical Adapter Plug and Electrical Outlet The Type B electrical plug has two flat parallel blades like the Type A, but also has a round grounding or earth pin that [...]

North American Plug

Type A Electrical Outlet (North American Plug) Type A Electrical Receptacle Countries Using Type A Electric Plug The Type A electrical plug, or flat blade attachment plug, uses two flat parallel pins or blades. It is found in most of North America and on the east coast of South America on smaller devices that do [...]

Output Plugs and Connectors

When purchasing AC-DC linear and switching power supplies, you must specify the output plug and connectors specification. This article will for help determining the units that you need. Item Code Item Type Description Image .725 Output Plug 0.7 X 2.5 X 10MM (EIAJ-1) .725-HP Output Plug O.7 X 2.5 X 10MM (HARD PLASTIC EIAJ-1) .932 [...]

AC Input

Larger power supplies may use three phase power. These can be more economical and a bit more efficient than single phase supplies, although the ripple frequencies will be higher. Isolation: specified as the DC or AC voltage that can be applied between input and output without the supply failing. Typical numbers are 500 to 1500 [...]

Ripple and Noise

There’s no universally-accepted method of measuring ripple and noise. Some sellers include external circuitry in making the measurements, so to duplicate their results, you will need to contact them how they make their measurements. The easiest measurement is to connect an AC-coupled oscilloscope to the output of the power supply. The measurement can be made [...]

Conditions for design high frequency transformer

It is greatly appreciated customer give us those conditions before you need High frequency transformers samples: (1)Circuit topology Flyback type, forward type, push-pull, half-bridge, etc (2)Input voltage range The lower limit of rectified voltage is important, in particular. (3) Operating frequency It is especially necessary to determine the lower limit frequency for the maximum load [...]

Switching Mode Power Supplies

A problem of linear power supply is the size and weight of the transformer. The size is required because of the low frequency (50 to 60 Hz). For the same power output, the transformer size goes down as the frequency goes up (up to a point). The SMPS takes advantage of this by chopping the [...]

Linear Regulation

The principle of operation of a linear regulation power supply is shown in the following diagram:

Glossary of power supplies (3)

Minimum load: If specified for a power supply, it is the minimum load current that must be drawn from the power supply so that it meets its performance specifications. Surge: A momentary increase in the AC power line voltage. Output impedance: The ratio of a change in output voltage to a change in load current. [...]

Glossary of power supplies (2)

AC: Alternating current. Describes voltage and current that varies in amplitude, usually in a sinusoidal waveform with respect to time. AC power is almost universally used for distributing electrical power. Blackout: Loss of AC electrical power. Brownout: A planned AC voltage reduction by the power company to counter excessive demand.