Haredata Electronics


Ambient Temperature

This is the temperature of the static atmosphere surrounding the Power Supply or Charger. This is measured at a distance of 10mm from the live powered unit.

Class “B” Medical Protection

This relates to protection against electric shock with particular reference to leakage current.

Class BF Medical Protection

This is similar to class ”B” but relates to Medical approvals and F-Type Applied Parts - an Applied Part which is electrically isolated from Earth and other parts of the medical equipment. i.e. floating. F-type Applied Parts.

Class CF Medical Protection

This standard offers the highest possible protection standard and is one of the requirements of IEC 60601, the medical safety standard approval. These CF Applied Parts are suitable and safe for direct cardiac application.

Current Limiting

This is an electronic overload device built into the product at the design stage to restrict the maximum current output to a pre-set value.

Efficiency Ratio

The efficiency ratio is the ratio between the power in and power out performance of an electronic or other device. The ratio is always less than 1. The highest possible ratio is the goal of product designers as inefficiency is converted to rising temperatures and increased component stress.

High efficiency ratios are often associated with high MTBF due to reduced operating temperatures.


“Electromagnetic Compatibility” is the satisfactory ability of a device or devices to function without producing an electromagnetic disturbance to other devices or living creatures.
Power Supplies and Chargers should comply with at least two minimum standards. These are:

1) Transient emissions emitted by the device and:
2) Interference resistance to other device/devices emissions.

These standards stipulate minimum levels of emissions and resistance to emissions.

Leakage Current

This describes electrical discharges from a device or devices which discharges to earth via the earth conductor and usually emanates from capacitors when off load.

Life Cycle

The life cycle of a Power supply or Charger is the lifetime after use for a number of years or cycles when a component or components will fail.


MTBF is Mean Time Between Failure. This is calculated based on the components incorporated into the design, the ambient operating temperature and is usually based on maximum current. This gives an indication of likely operating life at a nominal temperature; this is often 25° C.


NTC is a Negative Temperature Coefficient thermistor which varies in resistance as a result of temperature changes. This changing resistance is read by the Charger and is used to allow higher charge currents resulting in faster and safer battery charging.

Operating Temperature

This describes the operating temperature of the device and designed minimum and maximum parameters that should be complied with.

Over Voltage Protection

This is a pre-set parameter established at the design stage, and if this threshold is exceeded the device will automatically shut down.

Short Circuit Proof

This means that a temporary short circuit of a few seconds can be accommodated by the device without damage to the PCB.

“Single Range” or “Narrow Range”

Both of these descriptions relate to the mains AC input voltage, this generally 110 Volts for US markets and 230 Volts for European and others.


This is Surface Mount Technology, and is a method of attaching components by soldering onto a printed circuit board.

Standby Losses

This is the power consumption of a device whilst idling at zero load.

Storage Temperature

This is the ambient temperature range at which a device should be stored to prevent any dame when not in use.

Sustained Short Circuit Proof

The device is designed to be able to accept a short circuit situation and to automatically return to its designed output and performance after the event.


This is Through Hole Technology and is another method of mounting components onto a printed circuit board. After being applied to the board, they are soldered in place via a special THT oven.

Voltage Regulated

This is component added at the design stage to ensure consistent stable output voltage independent of other external factors such as temperatures.

Wide Range

This describes a device which can operate from varying AC input voltages. Typically this would be 100-240 Volts allowing the same device to be used in the US and almost throughout the world.

Battery Chemistry And Charging Information

Battery Chemistry and Charging Information

ChemistryLead AcidNi-CdNi-MHLi-Ion
Cell voltage2.0V1.2V1.2V3.6 resp. 3.7V
Energy density (Wh/kg)30-5045-8060-120110-190110-120
Self-discharge ratio per month5%20%30%8%
Overload tolerancehighmoderatelowvery low
Charging cycles200-4001500300-500300-500
Charging methodU= const.I= const.I= const.300-500
Charging characteristicIU0U, IUIaI0II0IIUa
 Phase 1: constant currentCharging criteria: -dV, dT/dt, dU/dt, T maxPhase 1: constant current
 Phase 2: constant voltageIdentification and control via microcontrollerPhase 2: constant voltage
 Phase 3: trickle charge 
Energy for Life Power Catalogue

Applications & Case Studies

Products supplied by Haredata Electronics have been used for a wide range of applications across many industry sectors. Take a look at some of the applications & case studies available to power your products.

Your Application not listed?

If you can not find your desired application listed from the case studies above, why not contact us to find out how we can help.