How does a DC power supply increase current?
The current magnitude of a DC power supply is a key parameter that determines the energy and power output that the power supply can provide. When we need to increase the current of the DC power supply, we can use the following methods:
Resistance adjustment
Adjust the current by inserting a variable resistor in series in the DC power supply circuit. This method is simple and easy to implement, but its accuracy and stability are limited. By adjusting the resistance value, the magnitude of the current can be changed to meet the needs of different devices.
Inductor adjustment
Utilize the hysteresis effect of inductors to adjust the current magnitude. By changing the number of turns or magnetic core material of the inductor, the inductance can be adjusted, thereby affecting the magnitude of the current. This method is suitable for applications with high currents.
Transformer adjustment
Adjust the current by using the turns ratio of the transformer. By changing the turns ratio of the transformer, the magnitude of the output current can be altered. This method is suitable for scenarios with multiple voltage outputs and can achieve independent regulation of voltage and current.
Integrated operational amplifier adjustment
Use integrated operational amplifiers (Op Amps) to adjust the current magnitude. By introducing a negative feedback circuit into the integrated operational amplifier, the magnitude of the output current can be precisely controlled. This method has high accuracy and stability, but the cost is relatively high.
pulse width modulation
Using pulse width modulation (PWM) technology to adjust the current magnitude. PWM technology adjusts the average current by controlling the pulse width. By adjusting the duty cycle, high-precision current regulation can be achieved. This method is widely used in fields such as switching power supplies and motor control.
