I have a 12V3A switching power supply. From 0V to 12V, 2V3V can start. Want to carry out voltage regulation. How to do?
If you use the potentiometer to connect the kind of potentiometer. I connected to the permanent magnet three brush motor is the car with the wiper motor, the motor high and low speed adjustment. Originally wiper motor there are two blocks. Richer speed adjustment.
With a potentiometer to the 12V3 amp DC motor speed, the voltage drop in the potentiometer (variable resistor) on the energy consumption of large (and fever), you that 12V3A switching power supply from 0V, 2V, 3V - -12V continuous adjustment
12V3A switching power supply can not change the output voltage by external voltage regulator.
Switching power supply PWM control technology using pulse width modulation technology to control the opening and closing of the switch, in order to achieve the stability of the output voltage.
Switching power supply during operation, the output voltage changes through the optocoupler device to feedback the signal to the PWM controller, control switch drive signal pulse width, that is, duty cycle, adjust the power switch switch ratio, to achieve stable output voltage purposes.
External voltage regulator potentiometer, can not be reliable access to the output signal acquisition and feedback adjustment function, it can not be achieved by an external regulator potentiometer to adjust the switching power supply output voltage.
Ordinary single-bit potentiometer If your switching power supply itself is with the regulator then the board should have a voltage regulator potentiometer that removed in a resistance and the same as the original can be a motor when the two can only use a block Fast on it
