Constant current sources

Constant current sources serve as current converters and power supply for Highpower-LEDs. LEDs or light emitting diodes are non-linear resistors and run with low-level direct current, that flows in one direction only. Thus, they cannot stand high current, alternating power or power fluctuations. For example, the German electricity grid provides 230V AC/alternating current, a car battery 12V. Therefore, a ballast is necessary to compensate the power out of socket or car battery and to limit the output power (in Ampere), that runs the Hi-power-LEDs. If those LEDs were directly connected to 230V-grid electricity, they might flicker, be damaged and blow. The LED-transformer, a so-called constant current source, regulates the power supply of high-performance LEDs. 

Topangebot transformer, ROUND, 3-45V 350mA-constant - for 1-12LED's each 1W 10.19 *
available
Topangebot
10.19 *
incl. VAT excl. shipping cost
letter standard delivery
available
shipping 1 to 4 days**
Topangebot transformer 3-45V 350mA-constant - for 1-12 LED's each 1W 10.19 *
available
Topangebot
10.19 *
incl. VAT excl. shipping cost
letter standard delivery
available
shipping 1 to 4 days**
Topangebot Slim LED constant current transformer | 350/500/700mA | 230V from 16.29 *
available
Topangebot
from 16.29 *
incl. VAT excl. shipping cost
letter standard delivery
available
shipping 1 to 4 days**
Topangebot LED transformer KSQ | 6/12/20W | constant 350mA from 9.59 *
available
Topangebot
from 9.59 *
incl. VAT excl. shipping cost
letter standard delivery
available
shipping 1 to 4 days**
Topangebot LED transformer, dimmable | constant current 9,6W 320mA 10.29 *
available
Topangebot
10.29 *
incl. VAT excl. shipping cost
letter standard delivery
available
shipping 1 to 4 days**
Topangebot LED transformer KSQ 15-36V 700mA-constant 15-24W 18.49 *
available
Topangebot
18.49 *
incl. VAT excl. shipping cost
letter standard delivery
available
shipping 1 to 4 days**
Constant current source for 10 - 18 x 1W High Power LED 20.59 *
available
20.59 *
incl. VAT excl. shipping cost
letter standard delivery
available
shipping 1 to 4 days**
LED distributor 4-way for series connection 3.19 *
available
3.19 *
incl. VAT excl. shipping cost
letter standard delivery
available
shipping 1 to 4 days**

How does a  constant current source work?


A constant current power supply functions as current controller, that means it regulates the input power and continuously delivers power in equal amount to one or more Highpower-LEDs. A constant current transformer as ballast unit allows series connection of several such LEDs. In order to limit the power running the high-performance LED and to keep it constant, the constant current source automatically changes its internal resistance and voltage. A constant current power supply unit as transformer for HighPower-LEDs provides a constant power while voltage ist variing. It makes the conventional series resistor for operating LEDs redundant.



Constant current  and constant voltage source – what is the difference?


Besides constant current sources there is a further type of switching power supply: a constant voltage source. As the name suggests, these transformers provide a constant voltage (Volt). In contrast to constant current sources amperage variies while voltage is consistent. Furthermore, a series resistor is needed to limit power. Of course, it depends on the particular application, to determine which transformer is the  appropriate one. Constant current sources are a useful and uncomplicated means for current matching. Without great effort they ensure to run high-performance LEDs with current sources that deliver alternating  input voltage like in cars.

* all prices including VAT and excluding shipping cost; minimum order 10 euros
** Valid for deliveries for standard shipping within Germany. Delivery times for other countries and information on the calculation of delivery, see here.
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