Linear power supply basic operating principle
The working process of the main circuit of a linear power supply is that the input power is first subjected to preliminary AC voltage stabilization through a pre stabilization circuit, then isolated and rectified by the main working transformer to transform into a DC power supply. Then, under the intelligent control of the control circuit and a single-chip microcontroller, the linear adjustment element is finely adjusted to output a high-precision DC voltage source.
1. Power transformer and rectifier: Convert 380V AC power into the required DC power.
2. Pre voltage stabilization circuit: Using relay components or thyristor components to pre adjust and preliminarily stabilize the input AC or DC voltage, thereby reducing the power consumption of linear adjustment components, improving work efficiency, and ensuring high precision and stability of the output voltage source.
3. Linear adjustment element: finely adjust the filtered DC voltage to achieve the required value and accuracy requirements for the input voltage.
4. Filter circuit: It maximizes the prevention and absorption of pulsating waves, interference, and noise in the DC power supply, ensuring low ripple, low noise, and low interference in the output voltage of the DC power supply.
5. Single chip microcomputer control system: After comparing, judging, calculating, analyzing and processing various signals detected by a single chip microprocessor controller, corresponding control instructions are issued to ensure the overall operation, reliability, and coordination of the DC stabilized power supply stabilized voltage system.
6. Auxiliary power supply and reference voltage source: Provide high-precision reference voltage source and power supply required for electronic circuit operation for DC voltage stabilization systems.
7. Voltage sampling and voltage regulation: detect the output voltage value of the DC stabilized power supply and set and adjust the output voltage value of the DC stabilized power supply.
8. Comparison amplification circuit: After comparing the output voltage value of the DC stabilized power supply with the voltage of the reference source to obtain an error voltage signal, amplify feedback and control linear adjustment components to ensure stable output voltage.
9. Current detection circuit: Obtain the output current value of the DC stabilized power supply, and provide information for current limiting or protection control.
10. Driver circuit: a power amplification circuit set up to drive executable components.
11. Display: Display of the output voltage and current values of a DC stabilized power supply.
