From a physics perspective,capacitors are a static charge storage medium that may exist permanently. It is generally believed that isolation conductors and infinity are constituted capacitors, and conductive grounding is equivalent to receiving infinite far away, and connect with the earth as a whole. Capacitors (or electrical capacity) are the physical quantities that express the capacitance capacity of the capacitor.
The capacitance is widely used.It is an indispensable electronic component in the field of electronics and power. It is mainly used in circuits such as power filtering, signal filtering, signal coupling, resonance, filtering, compensation, charging, energy storage, DC and other circuits.
DC:Capacitors can prevent DC through passing through to pass through, which is one of the basic functions of capacitors.
Energy storage:Capacitors can store charge and release these charge when needed. This characteristic makes them applied in equipment such as charging flashlights, scraper knives, etc. These devices provide short -term power supply through capacitors.
Filter:In the power circuit, the capacitance is often used as a flat filter to eliminate voltage fluctuations and noise, so as to provide a clean and stable power supply for sensitive electronic equipment.
Signal processing:In signal transmission and processing circuits, the capacitors and resistors can form an RC (resistance-capacitor) circuit together to create a variety of function circuits such as filters, frequency divisions, and timers.
Oscillating circuit:Capacchaser and inductance or crystal use can constitute oscillator and generate AC signal. This is an important part of radio and television transmitters, clock circuits, etc.
Starting assistance:For example, in the sunlight lamp enables and some motors, the capacitor can provide high voltage at the moment of startup to help start the device.
Power factor correction:In industrial applications, capacitors are used to improve the power factor of the grid and reduce energy loss.
Coupling and decoupled:Capacitors can be used to transmit AC signals in the circuit to block the DC component at the same time, and can also be used to stabilize the voltage in the circuit.
Solar system:In the solar street lights, the capacitor is part of the battery. The energy collected by the solar panel is stored, and the stored power energy is released at night.
Resonant and tuning:In wireless communication equipment, the combination of capacitors and inductance forms a resonant circuit to select signals with a specific frequency.
Protection:In some circuits, capacitors can also be used as over -voltage protection elements to protect subsequent circuits from being damaged by instantaneous high voltage.
Capacitors and batteries are important components in electronic circuits, but their functions and use methods are very different
1、capacitance is a charge storage device that stores energy by accumulating charge. This energy comes from the external power supply. When the charge stored in the capacitor reaches a certain degree, it has a certain amount of energy.
The charging and discharge process of the capacitor is instantaneous, so it is mainly used to provide instantaneous power supply, such as the smooth pulse dynamic DC in the filter, or the conveying communication signal in the coupling circuit. The unit of the capacitor is Fara (F), which is usually represented by C.
2、battery is a device that converts chemical energy into electrical energy. It contains a large amount of electrochemical materials. During the charging process, the battery converts electrical energy into chemical energy storage. During the discharge process, chemistry can be re -reached into electrical energy.
The main feature of the battery is that it has more electrical energy, which can continue to supply power for a period of time. The unit of the battery is Ashishi (AH), which means the product of current and time.
3、the battery and capacitors are also significantly different in the charging speed. Most of the capacitors can be quickly charged and discharged at large currents, and the charging and discharge process of batteries is usually slow. In addition, capacitors can work in AC circuits, while the battery charging and discharge can only be used by DC.
4、although capacitors and batteries are components of storage power, they are very different in terms of structure, function, usage, and units. The capacitance is mainly used to provide instant power supply, while the battery is used for continuous power supply.
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