This feature facilitates a PWM controlled modified sine waveform at the output.Īutomatic Output Voltage Regulation Feature P2 actually adjusts the width of the pulses at pin#11/#14, which helps to provide the required RMS at the output. The peak voltage generated at the output would be anywhere around 300 Volts which must adjusted to around 220V RMS using a good quality RMS meter and by adjusting P2. The mosfets in response, 'push and Pull the battery voltage/current across the two winding of the transformer which in turn generates the required mains AC at the output winding of the transformer. The above two outputs oscillate alternately in a push pull manner (totem pole), driving the connected mosfets into saturation at the fixed frequency - 50 Hz. The range of P1 is from 100Hz to 500 kHz, here we are interested in the 100 Hz value which ultimately provides a 50Hz across the two outputs at pin#11 and Pin#14. P1 can be adjusted for acquiring accurate frequencies as per the required specs of the application. The following explanation will walk us through the various stages of the circuit, let's learn them:Īs can be witnessed in the given diagram, the IC SG3525 is rigged in its standard PWM generator/oscillator mode where the frequency of oscillation is determined by C1, R2 and P1. In one of the earlier posts I discussed the pin out functioning of the IC 3525, using the data, I designed the following circuit which is though quite standard in its configuration, includes a low battery shut down feature and also an automatic output regulation enhancement. Let's learn more about the request and the circuit functioning. This circuit was requested by one of the interested readers of this blog.

Sg3525 proteus alternative