Product category:
Discrete Power Devices
News Release from: Puls UK | Subject: MLY02
Edited by the Electronicstalk Editorial
Team on 09 September 2003
Decoupling diode avoids dangers of
redundancy
The MLY02 decoupling diode is a low-cost solution for use in the design of redundant power supplies or for the isolation of power sources and loads.
The MLY02 decoupling diode is a low-cost solution for use in the design of redundant power supplies or for the isolation of power sources and loads The diode has two inputs with 10-60V input voltage and a maximum current load of 2 x 8A in dual-input operation, or 1 x 13A for inputs connected in parallel in single-input operation
This article was originally published on Electronicstalk on 3 Jul 2008 at 8.00am (UK)
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DIN-rail supplies have voltage drops covered
The latest addition to the Dimension range of DIN-rail power supplies from Puls offers an answer to the age-old problem of the voltage drop inherent in longer cables.
Miniature supplies on the DIN rail
The ML15 range of DIN-rail power supplies offers a choice of 5, 12 and 24V DC single outputs in a tiny 22.5 x 75 x 91mm housing.
With this diode a multitude of inexpensive solutions can be accomplished, such as the design of redundant power supplies, isolation between different power sources and the load, the protection of batteries and power supplies during charging, or the prevention of unwanted feedback of energy into the power source.
In applications where equipment failures can cost substantial sums, it is essential to design the power supply of an installation to be fail safe, ie redundant, by using several power supply units.
To design redundant power supplies it is necessary to decouple the power sources from each other.
Further reading
Supplies cut the cost of DIN-rail power
The C-Dimension Series of DIN-rail power supplies are considerably lower in cost than standard units, but with only minor reductions in functionality.
DIN-rail supplies come with conformal coating
Coating provides higher operational safety and reliability in a number of installation environments.
This is the only way to ensure that a defective power supply unit does not become a load on the remaining, functioning units and thus paralyses the entire power supply.
But there are other applications where it can also be useful to decouple power sources.
For example, the control of a main supply bus with heavy loads that tend to cause voltage drops or even short circuits can be decoupled using the decoupling diode, and buffered for up to 4s by the SLV20 buffer diode.
In this case, the MLY02 prevents feedback of the energy stored in the buffer diode into the main supply bus.
For battery charging, the insertion of the MLY02 in the charging current circuit between power supply and battery prevents premature discharging of the battery voltage through the power supply.
Another important benefit is the reverse polarity protection provided by the diode.
Even high back-feeding edges, which could destroy the power supply, are blocked.
These can, for example, be generated when a motor stops abruptly.
The MLY02 is a double decoupling diode packaged in the rugged, tried and tested MiniLine housing (45 x 75 x 91mm).
The wide input voltage range of 10-60V DC also allows applications outside standard 24V industrial supplies.
The output voltage is always 0.9V lower than the connected input voltage.
The maximum load is 8A per input or 13A when both inputs are operating in parallel to increase power.
For 10ms maximum, the short-term short-circuit current can reach up to 125A.
The unit has been approved worldwide as by UL508, UL60950 or CE.
For higher currents up to 50A, Puls offers the SLR01 and SLR02 redundancy diodes in tried and tested SilverLine metal housings.
In contrast to the MLY02, these units feature an under- and overvoltage display, their own DC-OK signals, relay outputs and LEDs as operating status indicators as well as the decoupling section.
Alternatively, Puls offers redundant power supplies with integrated redundancy diodes for output currents of 2.5, 5 and 10A.
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