Working principle of positive and negative poles of DC power supply
The DC power supply has two electrodes, positive and negative. The potential of the positive pole is high, and the potential of the negative pole is low. When the two electrodes are connected to the circuit, a constant potential difference can be maintained between the two ends of the circuit, thereby forming an anode from the external circuit. The current of the negative electrode.
Basic technical parameters of DC power supply: DC general input voltage: AC220V±10% 50Hz±5Hz, output ripple and noise: Cv≤1mvrms CC≤5mARms.
The difference between the water level and the height cannot maintain a steady flow of water, and by continuously pumping water from a low place to a high place, a certain water level difference can be maintained to form a steady water flow. Similarly, the electrostatic field generated by the charge alone cannot maintain a constant current, and with the DC power source, the non-electrostatic effect (referred to as "non-electrostatic force") can be used to make the positive charge from the negative electrode with a lower potential. Returning to the positive electrode with higher potential through the internal power supply to maintain the potential difference between the two electrodes, thereby forming a constant current. Therefore, a DC power source is an energy conversion device that converts other forms of energy into a power supply circuit to maintain a constant current flow.
The non-electrostatic force in the DC power supply is directed from the negative pole to the positive pole. When the DC power source is connected to the external circuit, the current from the positive electrode to the negative electrode is formed outside the power supply (external circuit) due to the electric field force. In the internal power supply (internal circuit), the action of non-electrostatic force causes current to flow from the negative electrode to the positive electrode, thereby causing the flow of charges to form a closed cycle.
When the positive and negative poles of the DC power supply are not connected, the power supply is in an open (open) state, and the potential difference between the two electrodes of the power supply is equal to the electromotive force of the power source. In the open state, no mutual conversion of non-electric energy and electric energy occurs. When the load resistor is connected to the two poles of the power supply to form a closed loop, the current flowing through the power source flows from the negative pole to the positive pole. At this time, the power EI provided by the power source is equal to the power UI sent to the external circuit (U is the positive pole of the power supply) The potential difference between the negative poles is the sum of the thermal power R0I lost in the internal resistance, EI=UI R0I. Thus, when the power supply supplies power to the load resistor, the potential difference between the two poles of the power supply U = E - R0I.
In order to obtain a higher DC voltage, the DC power source is often used in series. At this time, the total electromotive force is the sum of the electromotive forces of the respective power sources, and the total internal resistance is also the sum of the internal resistances of the respective power sources. Due to the increased internal resistance, it can only be used for circuits with low current intensity. In order to obtain a large current intensity, a DC power source of equal electromotive force can be used in parallel. At this time, the total electromotive force is the electromotive force of a single power source, and the total internal resistance is a parallel value of the internal resistance of each power source.
The DC power supply provides a stable arc and smooth droplet transfer. Once the arc is ignited, the DC arc can maintain continuous combustion. When the AC power source is used for welding, the arc cannot be continuously and stably burned due to the change of current and voltage direction and the arc is extinguished and re-ignited 120 times per second. In the case of low welding current, the DC arc has a good wetting effect on the molten weld metal and can regulate the size of the weld bead, so it is very suitable for welding thin parts. DC power supplies are more suitable for overhead and vertical welding than AC power because DC arcs are shorter.
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