Custom products

The WIC electronic transformers are compact Switch Mode Power Supplies (SMPS) having pins like a PCB transformer. The SMPS regulates its output voltage by switching energy storage(SMPS) elements such as inductors, by means of a transistor changing "on" and "off" states at high frequencies. In this mode of operation, the transistor has a very low resistance in its "on" state, thus enabling the converters to operate with high efficiency. The PWM duty cycle of the transistor is controlled by an integrated circuit ensuring proper output voltage regulation.

For mains input Switch Mode Power Supplies the necessary isolation is achieved by the built-in transformer which also acts as a mutual inductor for energy storage. Due to the high switching frequency this transformer can be of a much smaller size compared to 50/60Hz iron core types. This results in compact and light weight supplies, enabling applications with high power density.

The first stage of a mains AC input SMPS is the input filter and rectifier stage which converts the mains voltage into an unregulated DC voltage, fed to a large filter capacitor. The current drawn from the AC side flows in short pulses at the peak input voltage which causes harmonic distortions. These have to be compensated by suitable line filter circuits and PFC (Power Factor Correction) circuits, usually also contained in the input stage.

The inverter stage converts the unregulated DC voltage to AC by chopping it with a power transistor at high frequency. The duty cycle of the resulting AC voltage determines the amount of energy fed to the primary winding of the transformer, which then converts the voltage down to the required output levels on its secondary side.

SMPS transformers run at high frequency. Most of the cost and space savings in mains input Switch Mode Power Supplies result from the smaller size of the high frequency transformer. The transformer’s capability to transfer energy is proportional to the operating frequency. By using a much higher frequency, the core can be greatly reduced compared to 50/60Hz types. However, core losses increase at higher frequencies, thus ferrite material which has a low loss at the high frequencies is used.

The transformer’s AC output then is rectified and smoothed by a filter consisting of inductors and capacitors. The higher the switching frequency, the smaller the size of these components is needed.

These are ideal for a variety of smart energy solutions such as low power lighting controls, audio or thermostat controls and other smart home electronics applications, as well as industrial controls.

Key Features

• Universal Input Range 85VAC-305VAC*

• Compact encapsulated design

• Wide ambient temperature capability -25℃ to +85℃*, full power output w/o derating

• Low standby power consumption <0.1W

• Protection Capability: OVP, OSP, OCP, OPP.

• Compliance with UL/IEC standards

• EMC compatible.

Key Benefits

• Easy Plug & Play solution for control board applications

• Long life: MTBF >1 million hours*

• High Efficiency

• Customizable.