The article describes a basic design which is often applied with all SG 3525/3524 inverter circuits for applying automatic PWM output voltage control by the IC.
The section that's circled is a simple bridge rectifier with a potential divider phase by means of a 100k pot. It rectifies and delivers a sample opinions voltage from the inverter mains output to pin1 of the IC which recognizes this reviews and suitably handles the PWM of the IC and controls it to ensure that the output from the inverter by no means surpasses a specific limit as set by the 100k preset.
pin1 is the sensing input of the IC which replies and creates the PWMs narrower at any time the fed voltage from the 100k pot surpasses a particular specific limit.
Pin1 of IC SG3525/3524 actually forms one of the pinouts of the internal error amplifier opamp. The phrase error amplifier itself signifies that the opamp is allocated to feel and verify a opinions sample voltage (error signal) from the inverter output and correct the output PWM width appropriately. This voltage is felt making reference to the other pin of the IC (pin16) which can be internally set at a reference voltage of 5.1V.
In the event a growing advice is identified, the potential at pin1 of the IC which can be the sensing input of the error amplifier consequently goes higher than the other complementing pin16 of the opamp producing a high at the output of the internal error opamp.
This high is needed internally to amend or slim down the PWM frequency which often causes the mosfets to perform with consequently lower current, hence improving the output voltage of the inverter instantly with regards to the feedback signal.
Parts list for the above demonstrated SG 3525 inverter circuit with auto PWM voltage control feature.
The section that's circled is a simple bridge rectifier with a potential divider phase by means of a 100k pot. It rectifies and delivers a sample opinions voltage from the inverter mains output to pin1 of the IC which recognizes this reviews and suitably handles the PWM of the IC and controls it to ensure that the output from the inverter by no means surpasses a specific limit as set by the 100k preset.
pin1 is the sensing input of the IC which replies and creates the PWMs narrower at any time the fed voltage from the 100k pot surpasses a particular specific limit.
Pin1 of IC SG3525/3524 actually forms one of the pinouts of the internal error amplifier opamp. The phrase error amplifier itself signifies that the opamp is allocated to feel and verify a opinions sample voltage (error signal) from the inverter output and correct the output PWM width appropriately. This voltage is felt making reference to the other pin of the IC (pin16) which can be internally set at a reference voltage of 5.1V.
In the event a growing advice is identified, the potential at pin1 of the IC which can be the sensing input of the error amplifier consequently goes higher than the other complementing pin16 of the opamp producing a high at the output of the internal error opamp.
This high is needed internally to amend or slim down the PWM frequency which often causes the mosfets to perform with consequently lower current, hence improving the output voltage of the inverter instantly with regards to the feedback signal.
Parts list for the above demonstrated SG 3525 inverter circuit with auto PWM voltage control feature.
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