Both new PULS power supplies, the QS10.241-D1 (24V, 10A) and the QS10.481-D1 (48V, 5A), have suitable fuses installed and are designed for the extended creepages and clearance requirements. They also have agency approved (UL and IEC) for an operational voltage from 88-375Vdc, which should not cause any problems when applying for approval for an entire system.

The new ML60 offers as an off-the-shelf product a solution to powering equipment in the most harsh and severe weather conditions. As with other PULS power supplies, the ML60.122 and ML60.242 have been designed for full power in temperatures of up to +60°C but what makes the new low temperature models outstanding is its ability to start and deliver full power from an extreme cold of -40°C. One major issue at low temperatures are the NTC-resistors, which are usually used to control the input inrush current for this power class. PULS though have developed a special electronic inrush circuitry allowing the units to starts properly and to operate in these extreme conditions without harm.

The new units are housed in the same package as the ML50.100 series but can deliver 20% more output power even at lower costs. The advanced production technology reduces production costs without compromising quality or reliability but maintain the usage of high quality components.

Additional outstanding features of all the ML60 units are very low inrush current (for the low temperature models), high efficiencies of up to 90.4%, small width of only 45mm, < 0.85W no-load losses, wide temperature range up to +60°C without de-rating along with long lifetime expectancy and high MTBF figures. Also included is high immunity to transients and power surges as well as the low electromagnetic emission, which makes usage in nearly every environment possible.

The ML60.121, ML60.122, ML60.241 and ML60.242 power supplies are members of the MiniLine-2 family along with the ML15.051, ML15.121 and ML15.241 15W units (models with 5V, 12V and 24V outputs) and the ML30.241 (30W, 24V output) power supply. In addition to the power supplies, a MiniLine-2 redundancy module is also available in this new series part numbers YR2.Diode, YRM2.Diode, YR40.241 and YR80.241. All the MiniLine-2 units are available from stock. There are no plans to obsolete any of the predecessor MiniLine models and these will continue to be supported for many years to come.

Inrush Current for Power Supplies:  Switch-mode power supplies use pulse technology and the supply voltage is converted to DC using a bridge rectifier. The voltage is then smoothed using a large electrolytic capacitor. The charging of this capacitor causes inrush which can generate voltage dips, weld relay contacts, blow fuses or trip circuit breakers. This inrush can be controlled by one of many design techniques.

NTC Thermistors: NTC (Negative Temperature Coefficient) thermistors are thermally sensitive semiconductor resistors which show a decrease in resistance as temperature increases. A thermistor is a very simple way of controlling inrush for power supplies. When power is first applied, the thermistor is cold and has a high resistance, which limits the charging current. The thermistor heats up very rapidly due to the design and the resistance drops to a low level. There are also some disadvantages to using temperature sensitive resistors. The inrush is dependent on the ambient temperature; a colder environment can lead to starting problems, and a hotter ambient can render the inrush control useless. This method also generates a power loss and can lower the efficiency.

Fixed Resistors with Bypass: A power resistor is used in this method to control the inrush current. The resistor is bypassed after the electrolytic capacitor is charged. Several different components can be used as a bypass such as relays, Triacs or IGBT’s. This type of inrush control is independent of temperature and the power losses are much lower. However this method is more expensive, so it is used primarily in the larger wattage designs.

Pulse Charging of Input Capacitor: PULS developed, in the Dimension Series, a new way of controlling inrush by pulse charging the input capacitor. This method is a superior way of softly controlling how much energy is allowed to charge the capacitor. The advantage is that peak current can be defined more accurately, as there are no variables involved.  A delay on the charging is also incorporated into the design so that when power is initiated or restored, the supply does not contribute to unnecessary inrush as neighbouring equipment is also energized.

The PULS Dimension series has near zero inrush, meaning the inrush current is only slightly higher than the normal operating current. Some competitive models using NTC technology can have an inrush as high as 60A. Other advantages are that fuses or circuit breakers can be sized for operating current and not peak current. The inrush is independent of input voltage or temperature and at lower temperatures, there are no starting problems. This new design for inrush control has shown once again that the PULS Dimensions series is a leader in power supply design, and PULS will continue to use cutting edge technology to improve the overall performance of power supplies.

The protective coating is made with an acrylic varnish, The coating process is a dip coating and has no impact on the electrical performance of the power supply.

The typical field applications are:

Paper mills and paper processing industry which must be immune against all kinds of dust and electrostatic discharge.

Railways and construction machines with continuous vibrations and rapid temperature changes.

Farms, where fumes (barns, silos, etc.) are present and resistance to insects is required.

In protected outdoor areas, where moisture and condensation is occasionally present.

Systems which are cooled with fans, resulting in extreme dust deposits.

Subtropical regions with long lasting high humidity along with high ambient temperatures.

Lighting, advertising displays and score boards which are located in protected outdoor areas.
The following power supplies are available with conformal coated PC-boards as a stock item:

Most other models can be equipped with conformal coating, please contact us regarding this.

To eliminate the need for two batteries connected in series the developers from PULS have integrated firmware along with a unique circuit into the DC-UPS to boost the 12V battery voltage up to 24V. Smart semiconductors replace non-intelligent discrete components, therefore the need for the second battery is eliminated and the battery performance is maximized. The firmware runs a series of logical test on the battery and makes adjustments to maintain the constant output under all conditions.

UB10.241

With this concept, new advantages are achieved for the UB10.241 and with only one 12V battery, the DC-UPS provides a superior battery-management as well as a stabilized output voltage in buffer mode. These features ensure the optimal utilization of the battery and hold-up time. Additionally the precise battery-management has a positive effect to the battery service-life.

The PULS DC-UPS offers a unique feature of a constant output voltage in buffer mode which is different from all other DC-UPS on the market today. When the battery voltage starts to decrease, the load voltage is compensated electronically by the boost converter.

To provide easy installation and system integration, the UB10.241 integrates a comprehensive electronic safety-package offering protection against reverse battery polarity, incorrect battery voltage, high temperature and overload or short-circuit at the output.

With comprehensive LED indications and signal outputs diagnostics are made simple.

The DC-UPS UB10.241 and a commonly available 12V, 7Ah battery used in the PULS module (UZK12.071) are both DIN-rail mountable. Please see the table to the right in regards to the UB10.241 hold up times when used with UZK12.071 or UZK12.261.

The benefit of the one 12V lead-acid battery concept removes the worry of matched batteries.

For data on UB10.241 please click here. For data on UZK12.071 please click here and for UZK12.261 please click here.

There are two versions of the QT40 a 24V,40A (QT40.241) and 48V 20A (QT40.481) both delivering 960 Watts with record-breaking efficiency of 95.3%.

The QT40’s high performance has been achieved by PULS’s use of three micro-controllers to maintain optimum efficiency at all levels of load. This amazing efficiency also makes power sharing easy by allowing multiple units to be mounted side-by-side on the DIN Rail without the need for fan cooling.

Other features include near zero inrush at switch-on, & shut-down input. Both units have high Mean Time Between Failure (MTBF) values and despite its diminutive size it has built-in mains fuses. PULS’s unique Bonus Power overload design provides 150% current reserves for up to four seconds to help start demanding loads.

The QT40.241 and QT40.481 are ideally suited to industrial power applications such as control systems for large electric motors powering production equipment, conveyors, machine tools, etc.

These units are also ideal for harsh environment applications where the ability to operate at low temperatures is important. Ambient temperatures as low as -25 degrees centigrade can be tolerated without difficulty.

Both QT40.241 & QT40.481 also have a d.c. input range of 450~810Vdc.

For short form data on model QT40.241 click here and for QT40.481 click here.

The units have been tested to EN60079–15 and are approved for use in zone 2 hazardous systems category 3G.  PULS have had to make no electrical changes to achieve the approval and that the Standard had been met in essence by dual conformal coating the internal components of the units.

The units which achieved this standard are models QS5.241-A1, QS10.241-A1 and QS20.241-A1 all which are now in stock in large numbers at our premises, for further information please look at the datasheets on our site or contact us now for prices.

For short form data on model QS5.241-A1 click here, for model QS10.241-A1 click here and model QS20.241-A1 click here.

ATEX, which derives its name from the French ’ATmosphère EXplosif’ is the framework for controlling explosive atmospheres and the standards of equipment and protective systems used in them. By achieving EN60079–15 approval PULS is now well placed to become a major supplier of power supplies to this specialised sector of the market.

For data on ML30.241 please click here.

The new ML30.241 small size is matched by its price. By using advanced production technology which reduces production costs yet without compromising quality or reliability and PULS still maintains the usage of very high quality components.

The key features of the ML30.241 are high efficiencies of up to 89.4%, small width of only 22.5mm,< 0.4W no-load losses, a wide temperature range up to +60°C without de-rating, long lifetime expectancy and high MTBF figures. Also included is  high immunity to transients and power surges as well as  low electromagnetic emission.

The ML30.241 is a member of the new MiniLine-2 family along with the ML15.051, ML15.121 and ML15.241 15W units along with the ML60.121, ML60.122, ML60.241 and ML60.244 all of which are held in stock in our warehouse. In addition to the latest power supplies a MiniLine-2 redundancy module will shortly become available. There are no plans to obsolete any of the previous MiniLine models which will be continuously supported for many years to come.