NEWS

What is the role of hot plug controller in DC boost circuit

  Hot plug controllers are usually used in high availability systems such as servers, network switches, and other forms of communication infrastructure. This kind of system usually needs to replace the faulty circuit board or module in the charged state, and the system still operates normally. This process is called hot plug.   One use of the hot plug controller is to solve the output end protection problem of the switching DC boost circuit by using the overcurrent and short-circuit protection functions of the hot plug protection circuit.   The DC boost circuit is a switching DC boost circuit. The output voltage is higher than the input voltage, and the polarity of the output voltage is unchanged. It is to raise the low DC voltage provided by the battery to the required voltage value. Its basic working process is: high-frequency oscillation generates low-voltage pulses - pulse transformer boosts to a predetermined voltage value - pulse rectification to obtain high-voltage DC power. Therefore, the DC boost circuit belongs to a type of DC / DC circuit.   When the switch is on, the power supply forms a loop through the inductor switch, and the current is converted into magnetic energy storage in the inductor; When the switch is turned off, the magnetic energy in the inductor is converted into electrical energy at the inductor end, which is negative on the left and positive on the right. This voltage is superimposed on the positive end of the power supply and forms a loop through the diode load to complete the boosting function. When the output overcurrent is over-current, the circuit will sample the peak current of the switch, reduce the duty ratio and cause the output voltage to drop. When the output voltage drops to the input voltage, the overcurrent protection is no longer controlled and the protection fails.   In addition, the output overcurrent point will increase with the increase of the input voltage. When the output is short circuited, the input power supply will form a short circuit loop through the inductor and the booster diode, resulting in power failure. Another disadvantage of boost circuit is that it is not convenient to control off the output. When the control chip is turned off and the switch tube is turned off, the output still has voltage. Unlike buck circuit, it is very convenient to reduce the output voltage to 0 V   Hot plug refers to hot plug. Hot plug function allows users to take out and replace damaged power supply or cards and other components without shutting down the system and cutting off the power supply, thus improving the system's ability of timely recovery, expansibility and flexibility to disasters. If there is no hot plug controller, the module at the load side will have a surge current impact on the power supply when it is plugged in and out, affecting the stability of voltage and the reliability of power supply.   This problem can be solved by the hot plug controller, which can reasonably control the surge current and ensure the safe power on interval. After power on, the hot plug controller can continuously monitor the power supply current to avoid short circuit and overcurrent during normal operation.

local 2024-04-25 10:21:32 0

What is the role of plug-in power inductors in smart home scenarios?

  In recent years, smart home, also known as smart house, has appeared in people's vision. Generally speaking, it is a networked and intelligent home control system integrating automatic control system, computer network system and network communication technology. Smart home system is based on the residential platform and controls all appliances connected to the home network through mobile app.   Smart home includes eight subsystems; The purpose of these systems is to bring people a safe, convenient, comfortable, artistic, environment-friendly and energy-saving living environment. Smart home not only needs convenient and intelligent control program in software, but also needs to ensure the normal operation of smart home system in hardware.   In this case, various inductors must be used in the circuit to collect data. In addition, there are protection circuit, oscillation circuit, power supply circuit, power amplification circuit and filter circuit; These circuits are without exception, and inductors are one of the indispensable electronic components.   So, what is the role of plug-in power inductors in smart home scenarios?   Current blocking effect: the self induced electromotive force in the coil always opposes the current change in the coil. It can be mainly divided into high-frequency choke coil and low-frequency choke coil.   Tuning and frequency selection: LC tuning circuit can be formed by connecting inductance coil and capacitor in parallel. That is, if the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non AC signal, the inductive reactance and capacitive reactance of the circuit are also equal, so the electromagnetic energy oscillates back and forth between the inductance and capacitance, which is the resonance phenomenon of the LC circuit. During resonance, because the inductive reactance and capacitive reactance of the circuit are equivalent and reverse, the inductive reactance of the total circuit current is the smallest and the current is the largest (referring to the AC signal of f=f0), so the LC resonant circuit has the function of selecting the frequency and can select the AC signal of a certain frequency f.

local 2024-04-23 10:19:47 0

What is the application scenario of FPGA field programmable gate array

  Field programmable gate array (FPGA) is the product of further development on the basis of programmable devices such as pal (programmable array logic) and gal (general array logic). As a semi custom circuit in the field of application specific integrated circuits (ASIC), it not only solves the shortcomings of custom circuits, but also overcomes the shortcomings of the limited number of programmable devices.   The mainstream manufacturers of field programmable gate array FPGA chips include Xilinx, Altera, lattice and MICROSEMI, of which the first two have a total market share of 88%.   FPGA has a very mature and wide range of applications in the fields of aerospace, military industry and telecommunications. Taking the telecommunication field as an example, in the stage of all-in-one telecommunication equipment, FPGA is applied to network protocol parsing and interface conversion because of its programming flexibility and high performance.   In the nfv scenario, FPGA based on the general server and hypervisor can achieve a 5-fold performance improvement of the network element data plane, and can be managed and arranged by the openstack cyborg hardware acceleration framework.   In the cloud era, FPGA has been used as a basic IAAs resource to provide development services and acceleration services in the public cloud. AWS, Huawei and bat all provide similar general services. Up to now, Intel's Stratix 10 devices have been successfully applied to Microsoft's real-time artificial intelligence cloud platform brainwave project.   FPGA is also widely used in security, industry and other fields. For example, protocols such as video coding and decoding in security field can be processed by FPGA in the process of front-end data acquisition and logic control.   In the industrial field, small-scale FPGA is mainly used to meet the needs of flexibility. In addition, due to its high reliability, FPGA is also widely used in military and aerospace fields. With the construction of 5g network, FPGA will be widely used in the initial stage, and more FPGA will be used in new fields such as artificial intelligence.

local 2024-04-22 10:27:12 0

What is the difference between electrolytic capacitor and thin film capacitor

  There are electrolyte materials for storing charge inside the electrolytic capacitor, which are divided into positive and negative polarity, similar to batteries, and cannot be reversed. The positive electrode is a metal substrate with an oxide film, and the negative electrode is connected to the electrolyte (solid and non-solid) through a metal plate.   Polar electrolytic capacitors are usually used for power filtering and decoupling in power supply circuits or intermediate and low frequency circuits（ ǒ u) Signal coupling, time constant setting, DC isolation, etc. The non-polar electrolytic capacitor is usually used in the audio frequency divider circuit, the television s correction circuit and the starting circuit of the single-phase motor.   The working voltage of electrolytic capacitor is 4V, 6.3V, 10V, 16V, 25V, 35V, 50V, 63v, 80V, 100V, 160V, 200V, 300V, 400V, 450V and 500V, and the working temperature is - 55 ° ~ + 155 ℃ (4 ~ 500V). It is characterized by large capacity, large volume and polarity. It is generally used for filtering and rectification in DC circuits. At present, the most commonly used electrolytic capacitors are aluminum electrolytic capacitors and tantalum electrolytic capacitors.   A thin film capacitor is a capacitor with a metal foil as an electrode, which is overlapped with a plastic film such as polyethylene, polypropylene, polystyrene or polycarbonate from both ends and wound into a cylindrical structure. According to the type of plastic film, it is also called polyethylene capacitor (also known as mylar capacitor), polypropylene capacitor (also known as PP capacitor), polystyrene capacitor (also known as PS capacitor) and polycarbonate capacitor.   Thin film capacitor is an excellent capacitor because of its many excellent characteristics. Its main characteristics are as follows: non polarity, high insulation impedance, excellent frequency characteristics (wide frequency response), and small dielectric loss.   Therefore, the difference between electrolytic capacitor and thin film capacitor is obvious. The main points are as follows:   Life: electrolytic capacitors generally have life parameters, while thin film capacitors have no life, which can last for decades.   Capacitance value: the capacitance value of electrolytic capacitor can be very large, and high voltage and high capacitance value. The capacitance value of the film capacitor is relatively small. If you need a larger capacitance value, the film capacitor is uncertain.   Size: as for the specifications, the size of the thin film capacitor is larger than that of the electrolytic capacitor.   Polarity: electrolytic capacitors are divided into positive and negative electrodes, while thin film capacitors are not divided into non-polar capacitors. Therefore, it can be separated on the lead. The lead of electrolytic capacitor is one high and one low, and the lead of thin film capacitor is the same length.   Accuracy: the electrolytic capacitance is generally 20%, and the film capacitance is generally 10% and 5%.

local 2024-04-20 10:31:03 0

What is the status of the film capacitor industry chain?

  China is the largest producer of thin film capacitors, accounting for more than 60% of the global total output value. In 2020, the market size of China's film capacitance industry was 10.2 billion yuan.   With the application growth of thin film capacitors in new energy automobiles and photovoltaic fields, it is expected to produce more than 20 billion yuan incremental market scale in the next three years, and China's thin film capacitor market is expected to enter a high-speed growth period.   Thin film capacitor is a capacitor which takes electrical grade electronic thin film as dielectric and metal foil as electrodes and coils the electrodes with plastic thin film.   According to the current type, it can be divided into two types: DC film capacitance and AC film capacitance.   DC film capacitor is characterized by large capacity, low voltage resistance, polarity, self-healing characteristics, high reliability, good temperature stability and long service life. Typical applications include drivers, UPS, solar inverters, electronic ballasts, small motors for automobiles, household appliances, and various power sources.   AC film capacitor has the characteristics of small capacitance and high voltage resistance. It is an indispensable component in the application of conventional industrial AC power supply and the start and operation of asynchronous motor.   AC capacitors are widely used in AC output filters, especially output filters such as uninterruptible power supply (UPS) and photovoltaic inverters.   The function of thin film capacitor in photovoltaic inverters is mainly to absorb high pulse current at DC-Link end, make the voltage fluctuation at the inverter end stable and controllable, and play an important role in the stability and performance of photovoltaic devices.

local 2024-04-19 11:43:04 0

What are the advantages and functions of CBB film capacitors

  The so-called CBB capacitor, we usually refer to the capacitor mainly made from metallized polypropylene film. There are many kinds of capacitors, such as CBB21, CBB22, CBB20, CBB81, CBB13, MMKP82, CBB60, etc. What are the advantages of CBB film capacitor and what are its common functions?    So what are the common CBB capacitors?   CBB20 axial capacitor, generally with flat circular or cylindrical appearance, is a kind of capacitor using metallized polypropylene film as dielectric and electrodes, wrapped with flame retardant tape and sealed with epoxy resin. It is suitable for AC and DC circuits of instruments, instrumentation, household appliances, etc. It is widely used in crossover lines of audio systems. For example, axial capacitors are often used in many microphones and audio systems, and also in some ultrasonic masks.   CBB21 and CBB22 metallized polypropylene film capacitors. CBB21 is different from CBB22 in the past. CBB21 cannot be used in high frequency circuits, but now material technology has made great progress. CBB21 and CBB22 capacitors have no difference. This is a film capacitor with metallized polypropylene film as dielectric and electrode, epoxy resin sealed film capacitor, and also a film capacitor with the largest usage in film capacitor.   CBB22 thin film capacitor, CBB21/22 capacitor usage is particularly large, it is widely used in instruments, instrumentation, TV and home appliances lines for DC pulse, pulse, and AC voltage reduction, especially for various types of energy-saving lamps and electronic rectifiers.   MMKP82 capacitor, MMKP82 is a double-sided metallized polypropylene film capacitor, because it uses double-sided steamed film, so it has smaller volume than CBB81 capacitor, the two functions are exactly the same, but the capacity of MMKP82 is smaller, more resistant to high temperature and humidity environment.

local 2024-04-19 11:42:07 0

What are the product categories of LED drivers?

  Led's drive is generally referred to as the Led's Luminous Module Controller, which controls the current. If the control current is not good, the lamp may be damaged. Sometimes the current and voltage can be very unstable, then the driver will play a role. So LED drives are very good to check for damage during use. If it is damaged, it can cause the light to dim or turn off directly, and it can also cause flashes.   Led driver is an electronic device that drives the LED light to emit light and work normally. It is equivalent to the heart of the LED lamp. When the driver is in problem, the whole LED lamp will be in problem.   Drivers can be categorized   (1) Constant current:   The output current of the constant current drive circuit is constant, but the output DC voltage varies in a certain range with the magnitude of the load resistance value. Load resistance value is small, output voltage is low, and the larger the load resistance value, the higher the output voltage is.   Constant current circuits are not afraid of short-circuit loading, but full open loading is strictly prohibited.   Constant current drive circuit for LED is ideal, but relatively expensive.   Pay attention to the maximum withstanding current and voltage value used, which limits the number of LEDs used.   (2) Voltage regulator:   When the various parameters of the voltage regulator circuit are determined, the output voltage is fixed, but the output current changes with the increase and decrease of the load.   The voltage regulator circuit is not afraid of load opening, but it is strictly forbidden to completely short-circuit the load.   Drive the LED with a regulator-driven circuit, each string needs to be added with a suitable resistor to make each LED display brightness average;   The brightness will be affected by the voltage change coming from the rectifier.

local 2024-04-19 11:40:14 0

What is the parasitic effect of the capacitor

  A capacitor is an element that stores electric quantity and electric energy (electric potential energy). One conductor is surrounded by another conductor, or the electric field lines emitted by one conductor are all terminated in the conductor system of the other conductor, which is called a capacitor, including paper capacitors, mica capacitors, air capacitors, tantalum capacitors, thin film capacitors (polyethylene film, polystyrene film, polypropylene film, etc.), aluminum capacitors and ceramic capacitors.   Capacitors play an important role in tuning, bypass, coupling, filtering and other circuits. It is used in the tuning circuit of transistor radio and the coupling circuit and bypass circuit of color TV.   With the rapid development of electronic information technology, the updating speed of digital electronic products is getting faster and faster. The production and sales of consumer electronic products mainly including flat-panel TVs (LCD and PDP), notebook computers, digital cameras and other products continue to grow, driving the growth of the capacitor industry.   Parasitic means that the capacitance is not designed in that place, but there is always mutual capacitance between the wires, which is like parasitic capacitance between the wires, so it is called parasitic capacitance, also known as stray capacitance.   Parasitic capacitance generally refers to the capacitance characteristics of inductors, resistors, chip pins, etc. under high frequency conditions. In fact, a resistor is equivalent to a capacitor, an inductor, and a series connection of a resistor. It is not obvious at low frequency, but the equivalent value will increase at high frequency, which cannot be ignored. We should take it into account in the calculation. ESL is the equivalent inductance and ESR is the equivalent resistance. Whether it is resistance, capacitance, inductance, diode, triode, MOS transistor, or IC, we should consider their equivalent capacitance and inductance in the case of high frequency.   On the other hand, in addition to the capacitance between the plates, the sensor also has capacitive contact with the surrounding body (various elements and even the human body). This capacitance is called parasitic capacitance. It not only changes the capacitance of the capacitive sensor, but also the parasitic capacitance is extremely unstable due to the small capacitance of the sensor itself, which also leads to the unstable characteristics of the sensor and serious interference to the sensor.   Distributed capacitances distributed between wires, between coils and casings, and between some elements are called parasitic capacitances. Although their values are small, they are an important cause of interference.

local 2024-04-19 11:39:33 0

What is the basic working principle of transformer?

  A transformer is a static electromagnetic device that converts electrical energy from one value to another. Basically, the transformer consists of an iron core and two coils called primary and secondary windings.   Transformer is a device that transforms AC voltage, current and impedance. When AC current is connected in the primary coil, AC magnetic flux will be generated in the iron core (or magnetic core), causing voltage (or current) to be induced in the secondary coil. The transformer is composed of an iron core (or magnetic core) and a coil. The coil has two or more windings, of which the winding connected to the power supply is called the primary coil, and the other windings are called the secondary coil.   The changing current in one coil of the transformer produces a changing magnetic flux, and then induces a changing electromotive force on the second coil wound on the same iron core. Electric energy can be transmitted between two coils, and there is no metal connection between the two circuits. The transformer can increase or decrease voltage and current levels without changing the frequency.   However, the winding process of transformer will have different requirements according to different applications (different purposes). The main functions of the transformer are: voltage transformation; Impedance transformation; Isolation; Voltage stabilization (magnetic saturation transformer), etc. the commonly used iron core shapes of transformers generally include E-type and C-type iron cores.   Transformers can be divided into: distribution transformer, power transformer, fully sealed transformer, combined transformer, dry-type transformer, single-phase transformer, electric furnace transformer, rectifier transformer, reactor, transformer, anti transformer, lightning transformer, box transformer, box transformer.   The most basic type of transformer consists of two groups of coils wound with wires, which are inductively combined with each other. When an AC current (with a certain known frequency) flows through one group of coils, an AC voltage with the same frequency will be induced in the other group of coils, and the magnitude of the induced voltage depends on the coupling of the two coils and the degree of magnetic cross-linking.

local 2024-04-18 11:33:30 0

What is the purchase price of the latest Welded sponge?

The latest Welded sponge is priced at $29.99. This innovative cleaning tool has been designed to make household cleaning tasks easier and more efficient. With its durable construction and unique design, the Welded sponge is a must-have for any home.The Welded sponge is made from high-quality materials that are designed to withstand the rigors of everyday cleaning. The sponge is welded together using a special technique that ensures it will not fall apart or break apart during use. This means that you can rely on the Welded sponge to get the job done, time and time again.One of the key features of the Welded sponge is its unique shape. The sponge is designed to fit comfortably in your hand, making it easy to grip and maneuver. This ergonomic design allows you to clean hard-to-reach areas with ease, ensuring that every surface in your home is sparkling clean.In addition to its durable construction and ergonomic design, the Welded sponge also offers superior cleaning power. The sponge is made from a special material that is designed to absorb and hold onto dirt and grime, making it easier to clean even the toughest messes. Whether you are cleaning countertops, sinks, or floors, the Welded sponge is up to the task.Another benefit of the Welded sponge is its versatility. The sponge can be used on a wide range of surfaces, including tile, glass, stainless steel, and more. This means that you can use the Welded sponge throughout your home, making it a versatile and cost-effective cleaning tool.Overall, the latest Welded sponge is a must-have for any home. With its durable construction, ergonomic design, superior cleaning power, and versatility, the Welded sponge is sure to become your go-to cleaning tool. At a purchase price of $29.99, the Welded sponge is an affordable and effective solution for all of your cleaning needs.

local 2024-03-25 01:06:08 5