The fundamental operation of a linear power supply
The working process of the main circuit of the linear power supply is that the input power supply is initially stabilized by the pre-stabilized voltage circuit, and then converted into a DC power supply through the isolation and rectification of the main working transformer, and then controlled by the control circuit and the single-chip micro-processing controller. The linear adjustment element is finely adjusted to make it output a high-precision DC voltage source.
1. Power transformer and rectification: convert the 380V AC into the required DC.
2. Pre-stabilization circuit: Relay components or thyristor components are used to pre-adjust and initially stabilize the input AC or DC voltage, thereby reducing the power consumption of linear adjustment components and improving work efficiency. And ensure the high precision of the output voltage source and high stability.
3. Linear adjustment element: Finely adjust the filtered DC voltage to make the input voltage meet the required value and accuracy requirements.
4. Filter circuit: It can prevent and absorb the pulsating wave, interference and noise of the DC power supply to the maximum extent, so as to ensure 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 micro-processing controller compares, judges, calculates, analyzes and processes the various signals detected, and then issues corresponding control instructions to make the overall voltage stabilization 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 electronic circuit work 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 and amplification circuit: After comparing the output voltage value of the DC stabilized power supply with the voltage of the reference source to obtain the error voltage signal, perform amplification feedback and control the linear adjustment element to ensure the stability of the output voltage.
9. Current detection circuit: Obtain the output current value of the DC stabilized power supply for current limiting or protection control information.
10. Drive circuit: a power amplifier circuit arranged to drive the executable element.
11. Display: Display of output voltage value and output current value of DC regulated power supply.
