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Noun explanation - DC power supply

Noun explanation - DC power supply

The DC power supply, that is, the DC power supply, is a device that maintains a constant current in the circuit. Such as dry batteries, batteries, DC generators, etc.
 
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.
 
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 help of 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 source (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.
 
An important characteristic quantity characterizing the power source itself is the electromotive force of the power source, which is equal to the work done by the non-electrostatic force when the unit positive charge is moved from the negative electrode through the power source to the positive electrode. When the power supply supplies energy to the circuit, the supplied power P is equal to the product of the electromotive force E of the power supply and the current I, P = E I . Another characteristic quantity of the power supply is its internal resistance (referred to as internal resistance) R0. When the current through the power supply is I, the thermal power loss inside the power supply (ie, the Joule heat generated per unit time) is equal to R0I.
 
When the positive and negative poles of the 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 inside 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 electrodes) and 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. When using another power source with a larger electromotive force to connect to a power source with a smaller electromotive force, the positive pole is connected to the positive pole and the negative pole is connected to the negative pole (for example, the battery pack is charged by a direct current generator), the current is from the inside of the power source with a small electromotive force. The positive pole flows to the negative pole. At this time, the outside world inputs an electric power UI to the power source, which is equal to the sum of the energy EI stored in the power supply per unit time and the thermal power R0I lost in the internal resistance, UI=EI R0I. Therefore, when the outside world inputs power to the power source, the voltage applied between the two poles of the power source should be U=E R0I.
 
When the internal resistance of the power supply can be ignored, it can be considered that the electromotive force of the power supply is approximately equal to the potential difference or voltage between the two poles of the power supply.
 
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.
 
There are many types of DC power supplies. In different types of DC power supplies, the nature of non-electrostatic forces is different, and the process of energy conversion is different. In chemical batteries (such as dry batteries, batteries, etc.), non-electrostatic forces are chemical interactions associated with the dissolution and deposition processes of ions. When a chemical battery is discharged, chemical energy is converted into electrical energy and Joule heat is applied to the temperature difference (eg metal temperature difference). In even and semiconductor thermocouples, the non-electrostatic force is a diffusion effect associated with the temperature difference and the concentration difference of the electrons. When the temperature difference power supply supplies power to the external circuit, the thermal energy is partially converted into electric energy. In a DC generator, the non-electrostatic force is an electromagnetic induction. When the DC generator is powered, the mechanical energy is converted into electrical energy and Joule heat. In photovoltaic cells, non-electrostatic forces are the effect of the photovoltaic effect. When photovoltaic cells are powered, light energy is converted into electrical energy and Joule heat.
DC power principle
Hrcpower series high-frequency switching DC power supply adopts full-bridge phase-shift pulse width modulation soft switching control technology, which further improves module efficiency and reduces harmonics. The high-frequency switching DC power supply module adopts three-phase three-wire 380VAC balanced input, no phase sequence requirement, no neutral current loss, and adopts advanced spike suppression device and EMI filter circuit at the AC input end. The high-frequency switching DC power supply is rectified into a direct current by a full-bridge rectifier circuit. After passive power factor correction (PFC), the DC power generated by the DC/DC high-frequency conversion circuit is inverted into a stable and controllable direct current. Output. High-frequency switching DC power supply pulse width modulation circuit (PWM) and soft-switching resonant circuit automatically adjust the pulse width and phase shift angle of the high-frequency switch according to changes in the grid and load, so that the output voltage and current can be maintained under any allowable conditions. stable.
 
The high-frequency switching power supply can work in a single machine to complete various basic functions, and can work in parallel, and has a good parallel current sharing effect. The high-frequency switching DC power supply can realize the "telemetry, remote signaling, remote control, remote adjustment" four remote functions by connecting with the microcomputer. The high-frequency switching DC power supply has perfect protection functions to ensure the safety and stability of the system under the independent operation of the module or module group and the monitoring of the microcomputer. The high frequency switching DC power supply module adopts bus sampling master and slave current sharing control modes. In the parallel operation, a high-frequency switch DC power module group can automatically select a main module, and process external parameters such as current and voltage collected by the shunt to centrally control the output voltage and current of each module. Therefore, even at a small current, a better current sharing effect can be obtained.
 

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