Pulse-width-modulated PWM is the term used in switched regulated power supplies. This is classified according to the control mode of voltage regulation, in addition to PWM type, there are PFM type and PWM, PFM hybrid type. Pulse width modulation (PWM) switching voltage regulator is to adjust its duty cycle through voltage feedback to stabilize the output voltage when the output frequency of the control circuit is unchanged.
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With the development of electronic technology, a variety of PWM technologies have emerged, including: Phase voltage control PWM, pulse width PWM method, random PWM, SPWM method, line voltage control PWM, etc., and the pulse width PWM method used in the nickel-metal hydride battery intelligent charger, it is the pulse column with equal pulse width as PWM waveform, frequency can be adjusted by changing the period of the pulse column, and the width or duty ratio of the pulse can be adjusted. The voltage and frequency can be coordinated by using appropriate control methods. The charging current can be controlled by adjusting the PWM period and PWM duty cycle.