The basic working principle of the linear power supply
The working process of the main circuit of the linear power supply is that the input power is first subjected to preliminary AC voltage stabilization by the pre-stabilizing circuit, and is then converted into DC power through isolation rectification by the main working transformer, and then is controlled by the control circuit and the single-chip microprocessor controller under the intelligent control. The linear adjustment component 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-stabilizing circuit: Use relay components or thyristor components to pre-adjust and initially stabilize the input AC or DC voltage, thereby reducing the power consumption of linear adjustment components, improving work efficiency, and ensuring high accuracy of the output voltage source. and high stability.
3. Linear adjustment component: Finely adjust the filtered DC voltage so that the input voltage reaches the required value and accuracy requirements.
4. Filter circuit: Block and absorb the pulsation wave, interference, and noise of the DC power supply to the maximum extent, thereby ensuring that the output voltage of the DC power supply has low ripple, low noise, and low interference.
5. Single-chip microcomputer control system: The single-chip microprocessor controller compares, judges, calculates, analyzes and other processes on various detected signals, and then issues corresponding control instructions to make the overall voltage stabilizing system of the DC stabilized power supply work normally and reliably. ,coordination.
6. Auxiliary power supply and reference voltage source: Provide high-precision reference voltage source and power supply required for the operation of electronic circuits for the DC voltage stabilization system.
7. Voltage sampling and voltage regulation: detect the output voltage value of the DC regulated power supply and set and adjust the output voltage value of the DC regulated power supply.
8. Comparison amplification circuit: Compare the output voltage value of the DC regulated power supply with the voltage of the reference source to obtain the error voltage signal, then amplify the feedback and control the linear adjustment component to ensure the stability of the output voltage.
9. Current detection circuit: Obtain the output current value of the DC regulated power supply for current limiting or protection control information.
10. Driving circuit: A power amplifier circuit set up to drive executable components.
11. Display: Display of the output voltage value and output current value of the DC regulated power supply.
