UPS Circuit For Cordless Phones PCB

This circuit diagram of a UPS is designed for use with cordless telephones that cannot operate during a power failure. Since the UPS is intended solely for telephones, its output power is limited to 1.5W. This UPS circuit is economical and can be assembled on a general-purpose PCB. The circuit operates around the IC CD4047, which functions as an astable multivibrator operating at a line frequency of 50Hz. Its outputs are capable of directly driving MOSFETs IRF540, which are configured in a push-pull arrangement. The inverter output is filtered to reduce spikes using a metal oxide varistor (MOV).

This uninterruptible power supply (UPS) circuit is specifically tailored for cordless telephones, ensuring they remain operational during power outages. The design emphasizes efficiency and cost-effectiveness, making it suitable for assembly on standard printed circuit boards (PCBs). The core of the circuit is the CD4047 integrated circuit, known for its versatility as an astable multivibrator. Operating at a frequency of 50Hz, this IC generates a square wave output that can be utilized to control the power delivery to the telephone.

The configuration of the output stage employs IRF540 MOSFETs, which are arranged in a push-pull configuration. This arrangement allows for effective switching and amplification of the signal generated by the CD4047. The IRF540 MOSFETs are chosen for their high efficiency and ability to handle significant power loads, making them ideal for this application, despite the low output power requirement of only 1.5W.

To protect the circuit from voltage spikes that could potentially damage the components, a metal oxide varistor (MOV) is included in the design. The MOV acts as a transient voltage suppressor, clamping excessive voltages and ensuring that the output remains stable and safe for the connected telephone. This additional filtering stage enhances the reliability of the UPS circuit, providing a clean and stable power supply during interruptions in the mains electricity.

Overall, this UPS circuit design is a practical solution for maintaining the functionality of cordless telephones during power failures, combining efficient power management with robust component selection and protective measures.Circuit This circuit diagram of UPS is designed to use with a cordless telephones that cannot be operated during power failure. Since the ups is only meant for telephone, it`s output power is limiter to 1. 5W. This ups circuit is economical and can be assembled on a general purpose PCB. The circuit works around IC CD4047 which is an astable multivi brator operating at line frequency 50Hz. It`s outputs are capable of driving MOSFETS IRF540 that is configured as push pull type, directly. Here the inverter output is filtered the spikes are reduced using a metal oxide varistor (MOV). 🔗 External reference