Variable Voltage and Current Power Supply circuit
In this circuit design, the power transformer plays a crucial role by supplying the necessary bipolar voltage to the operational amplifiers, which are vital for precise voltage regulation. The additional winding on the transformer ensures that both positive and negative voltages are available, which is essential for the op-amps to operate effectively in a feedback configuration.
The use of a reference voltage below ground is a key feature of this design, allowing for greater flexibility in output voltage adjustment. This capability is particularly important in applications requiring a variable output voltage that can reach 0 volts, making the circuit suitable for a wide range of electronic devices.
Current limiting is implemented through the use of a small resistor placed in series with the negative supply line. This resistor serves as a sensing element, where the voltage drop across it is proportional to the current flowing through the circuit. By monitoring this voltage drop, the circuit can effectively limit the current to prevent damage to the components and ensure safe operation. This method of current limiting is both efficient and reliable, contributing to the overall stability of the power supply.
In summary, this op-amp-based power supply regulation method showcases an effective way to achieve adjustable output voltages while incorporating essential features such as current limiting and bipolar voltage supply. The design demonstrates a practical application of operational amplifiers in power management systems, providing a robust solution for various electronic applications.Another method of using opamps to regulate a power supply is shown. The power transformer requires an additional winding to supply the op-amps with a bipolar voltage (+/- 8 volts), and the negative voltage is also used to generate a reference voltage below ground so that the output voltage can be adjusted all the way down to 0. Current limiting is accomplished by sensing the voltage drop across a small resistor placed in series with the negative supply line..
🔗 External reference
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