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The introduction of OSC and PWM oscillator of DC charging pile power switch chip
Main component
Concept:
Oscillator OSC: In the DC charging pile power switch chip, the oscillator (OSC) is the basis for generating PWM (pulse width modulation) signals. It forms sawtooth wave through charge and discharge of capacitor, and generates square wave with adjustable duty cycle together with comparator, so as to control the switching state of power MOS tube.
PWM (Pulse Width modulation) : PWM is a modulation technique that controls the average value of the output voltage or current by changing the width of the pulse. In the DC charging pile, PWM is used to precisely control the switching of the power MOS tube in the power switch chip to achieve a stable output voltage.
Function:
The role of the oscillator OSC: The role of the oscillator in the DC charging pile power switch chip is to produce a stable clock signal, which determines the frequency of the PWM signal, and then affects the conversion efficiency and output stability of the power supply.
The role of PWM: The role of PWM in DC charging pile is to control the on-time of the power MOS tube by adjusting the duty cycle of the pulse, so as to control the size of the output voltage and achieve constant voltage or constant current output.
Working Principle:
1. Oscillator OSC working principle:
An oscillator usually consists of a resistor and a capacitor, through which the capacitor is charged and discharged in a sawtooth wave.
- The frequency of the sawtooth wave can be set by adjusting the value of the resistance and capacitance, which is the base frequency of the PWM signal.
- The sawtooth wave generated by the oscillator is fed into the comparator and compared with a fixed reference voltage, thus producing a square wave signal, i.e. a PWM signal.
2. PWM working principle:
The PWM signal is controlled by the square wave signal generated by the oscillator and the output signal of the error amplifier.
- The error amplifier compares the feedback voltage with the set reference voltage to produce an error signal.
- This error signal is compared with the sawtooth wave generated by the oscillator, when the error signal is higher than the sawtooth wave, the PWM signal is high and the MOS tube is on; When the error signal is lower than the sawtooth wave, the PWM signal is low and the MOS tube is cut off.
- By adjusting the duty cycle of the PWM signal, the on-time of the MOS tube can be controlled, and then the output voltage can be adjusted to achieve stable output.
Sum up
In summary, the oscillator OSC and PWM play a crucial role in the DC charging pile power switch chip, they work together to ensure a stable output of the power supply and efficient conversion. The oscillator provides the basic clock signal, and the PWM controls the switching of the power MOSFet according to this clock signal and the error signal to achieve accurate voltage regulation.
DC CHARGING PIlE SERIES
DC charging pile is an efficient charging facility for electric vehicles, which uses direct current (DC) to directly charge the vehicle battery, significantly reducing the charging time. Compared with traditional AC charging piles, DC charging piles are able to provide higher power output and can usually charge an EV to 80% of its capacity in 30 minutes, providing users with a convenient charging experience.
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