isolated ac current monitor

This circuit utilizes a small AC current transformer from Magnetek to generate an isolated voltage that is proportional to the AC current flowing through the primary winding. The transformer features a single-turn primary with a low resistance of 0.001 ohms. It is capable of handling up to 30 amps of AC current while providing a minimum of 500 VAC of electrical isolation. The circuit is designed such that an input of 1 amp of current results in an output of 100 mV of AC voltage.

The AC current transformer operates based on the principle of electromagnetic induction, where the primary winding, which consists of a single turn, is directly connected to the AC current source. The low resistance of the primary winding minimizes power loss and ensures accurate measurement of the current. The transformer is designed to provide high isolation, making it suitable for applications where safety and signal integrity are critical.

The output voltage from the transformer is scaled to produce a specific output level. In this case, for every 1 amp of AC current flowing through the primary, the output voltage is calibrated to 100 mV of AC. This scaling can be achieved through additional circuitry, such as resistive dividers or operational amplifiers, depending on the desired output characteristics and load requirements.

It is essential to consider the frequency response of the transformer, as it may influence the accuracy of the output voltage at different frequencies of the AC signal. The transformer should be selected based on the frequency range of the application to ensure optimal performance.

Furthermore, the circuit may include additional components for signal conditioning, such as filters or amplifiers, to refine the output signal for further processing or measurement. The design of such a circuit must adhere to safety standards, especially when dealing with high voltages and currents, to prevent electrical hazards and ensure reliable operation.This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding. The transformer contains a single turn primary with a low 0. 001-ohm resistance. It can easily handle 30 amps of AC current and provides at least 500vac of isolation. With the components shown, the out put AC voltage is scaled so 1 amp of current produces 100mv of AC voltage. 🔗 External reference