The Meaning Of I And O Rocker Switch

I is on, O is off. Switches are also represented by other symbols, namely ON and OFF, where the symbols OFF are off and ON are on.

Meaning of power switch symbol:

The position of "I" represents the number "1", which means on, equivalent to the level signal on.

The "O" position represents the number "0", which means off, equivalent to the level signal off.

"I" and "O" are generally marked at both ends of the button of the ship (warped) switch. A more scientific design is to mark the word "ON" at the "I" end of the switch and the word "OFF" at the "O" end of the switch.

The working principle of the power switch symbol:

Switching power supply is a power supply that uses modern power electronics technology to control the time ratio of switching tube to turn on and off to maintain stable output voltage. Switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFET.

The working process of a switching power supply is fairly easy to understand. Unlike a linear power supply, which allows the power transistor to operate in linear mode, a PWM switching power supply allows the power transistor to operate in a state of on and off.

In both states, the volt-ampere product added to the power transistor is small (at on-off, the current is low and the current is high; When off, the voltage is high, the current is low) the volt-ampere product on the power device is the loss on the power semiconductor device.

Compared with the linear power supply, PWM switching power supply more effective working process is through the "chopper", that is, the input DC voltage into the pulse voltage amplitude is equal to the input voltage amplitude to achieve.