Current mode PWM boost circuit and feedback signal sensing method thereof

A current mode PWM circuit comprising:

• a boost unit comprising a boost inductor and a switch, said boost unit being configured to increase voltage to generate a DC output voltage;
• a voltage dividing circuit configured for generating a divided voltage from said DC output voltage;
• an error amplifier configured to generate an error signal by comparing a reference voltage with said divided voltage;
• a comparator configured to generate a first signal by comparing said error signal with a feedback signal;
• a pulse width generator configured to receive said first signal and a second signal, said second signal coming from an oscillator to generate a third signal, wherein said third signal is configured to control said switch;
• said
• a feedback signal generating unit coupled to said boost unit to generate said feedback signal, wherein said feedback signal comprises an equivalent inductor current signal flowing through said boost inductor and an equivalent slope compensation ramp signal, said feedback signal generating unit comprising:
• a capacitor having a terminal coupled to a connection point of said boost inductor and said switch;
• and
• a current source coupled to another terminal of said capacitor.