For capacitive divider power supply circuit only contains a few simple components, so its structure is simple and reliable. In this circuit, the most important electronic component is the resistive capacitive buck capacitor. Should the capacitive divider power supply capacitor be an X2 capacitor or a CBB capacitor?
The answer is: X2 capacitors and many CBB capacitors can be used as resistance capacitance step-down capacitors.
X2 safety capacitor specifically designed for capacitive divider power supply
X2 capacitors are mainly used to suppress electromagnetic interference from power sources. Ordinary X2 capacitors cannot be used as resistance capacitance step-down capacitors, otherwise there will be problems such as rapid capacity decay and extremely short service life.
1, If you want to use it in capacitive divider power supply circuits, you must use WFC-A series capacitors specifically designed for resistive capacitive divider.
The X2 safety standard capacitor for resistive capacitive voltage reduction is a type of capacitor used in resistive capacitive voltage reduction circuits, which has excellent electrical and stability performance. This type of capacitor usually uses high-quality dielectric materials and electrode materials, which have the characteristics of high withstand voltage, low loss, good stability, long service life, and comply with safety standards, with safety and reliability.
2. CBB22 capacitor specifically designed for resistive capacitive voltage reduction.
In order to avoid oxidation of the metal coating caused by high voltage communication, the CBB22 capacitor specifically designed for resistive capacitive voltage reduction uses different metal thin films, which can significantly slow down the decay rate of the capacitance value. At the same time, the production process is more complex and must be carried out in a constant temperature and humidity workshop to reduce the water content of the production environment and minimize the adsorption of moisture by the product. The zinc aluminum film capacitor core is immediately sealed after heating up, and the product temperature is increased while being evacuated and cured.
3. MPB box capacitors specifically designed for capacitive divider power supply
This type of capacitor is similar to the CBB22 capacitor, with the same internal capacitor core, except that the MPB capacitor has better performance and longer lifespan.
X2 safety capacitors are mainly divided into two types: one is anti power electromagnetic interference, and the other is resistance capacitance voltage reduction. Today, we will focus on introducing the X2 safety capacitors specifically designed for resistance capacitance voltage reduction.
The X2 safety capacitors used for voltage reduction and the capacitors used for anti-interference, although both are made by winding metalized polypropylene film, still have certain differences in their internal composition,
The main adjustment is to adjust the zinc aluminum ratio of the metal film, and at the same time, the resistance capacitance voltage reduction X2 safety capacitor adopts a double 85 characteristic metalized polypropylene film and epoxy resin cured sealing adhesive.
This is used in resistive capacitive buck circuits, which means that the capacity decay is smaller and the lifespan of the capacitor is longer
Can ordinary anti-interference X2 capacitors be used in resistive capacitive buck circuits? Indeed, there have been some customers who are not familiar with X2 capacitors and directly use ordinary X2 capacitors for anti-interference in resistive capacitive voltage reduction circuits. The result is that their capacity decays quickly. After a few months of use, due to the severe capacity decay of X2 capacitors, the power supply to the resistive capacitive voltage reduction circuit is insufficient, and the electrical appliances cannot be used normally.
What are the characteristics and functions of the X2 capacitor for resistive capacitive voltage reduction? We call the optimized series X2 certified AC safety capacitors for resistance capacitance voltage reduction. They use polymer polypropylene film dielectric, thickened metalized electrodes, fully automatic spray welding process, 94V0 flame-retardant PBT plastic shell, moisture resistant epoxy resin sealing, and CP wire lead out. High voltage resistance, moisture and heat resistance, low capacitance drop, specifically designed for resistive capacitive voltage reduction circuits, such as LED driver modules, electric meters, small household appliances and other low-power electronic consumer products.
Reminder: When choosing X2 capacitors in the future, it is important to clarify whether they are used for anti-interference or resistive capacitive voltage reduction applications. If using resistive capacitive voltage reduction circuits, X2 safety capacitors specifically designed for resistive capacitive voltage reduction must be used, otherwise the circuit is prone to problems.
X2 safety capacitors are commonly used in power circuits to suppress electromagnetic interference. They are installed between the live and neutral wires of the power supply to filter out high-frequency noise, ensure the stability of the power supply, and reduce the potential impact of electromagnetic interference on other electronic devices.
In fact, X2 safety capacitors can be further divided into many types. Taking the WFC-A series X2 safety capacitors from WEET as an example, they can be divided into suppression of power electromagnetic interference type, PD fast charging dedicated type, resistance capacitance voltage reduction dedicated type, double 85 type, moisture-proof type, etc.
In what occasions are moisture-proof X2 safety capacitors used?
This X2 capacitor is suitable for capacitor voltage reduction circuits connected in series with power sources, such as smart meters, LED power supply modules, and other harsh application environments.
What are the characteristics of moisture-proof X2 safety capacitors?
1. The capacity attenuation is extremely small.
Compared with the anti-interference X2 capacitor, our moisture-proof X2 capacitor has less capacity attenuation and can be used in harsh environments such as high temperature and high humidity for a long time with excellent capacity stability.
The moisture-proof X2 capacitor was designed with long-term stability in mind, with minimal capacity decay and the ability to provide stable performance throughout the entire lifespan of the device.
2. Capacitors have self-healing properties and can withstand surge voltage impacts.
3. Excellent flame retardancy and better high-temperature resistance.
4. Better high temperature resistance. The moisture-proof X2 safety capacitor can operate stably in high temperature environments, and its design considers performance maintenance at high temperatures to ensure that there will be no performance degradation or capacity degradation under long-term high temperature loads.
5. Better moisture resistance.
Due to the fact that some electronic devices may be used in humid environments, these capacitors typically have good moisture resistance and can maintain stable electrical characteristics in high humidity environments.
WEET Characteristics of THB series X2 safety capacitors Cross TDK B3293 - X2 Heavy Duty Series Safet
What are the differences between THB type X2 safety capacitors and regular X2 capacitors
For X2 safety capacitors, those who are not familiar with them believe that their function is to suppress power electromagnetic interference. In fact, X2 capacitors have many usage scenarios, some of which do not require high performance, but some require strict performance from X2 capacitors. Strong capacitor manufacturers, such as WEE Technology, will classify WFC-A X2 capacitors into anti-interference type, resistance capacitance voltage reduction type, THB high temperature resistance, high humidity type. What are the differences between THB X2 safety capacitors and ordinary X2 capacitors? What is THB type X2 safety capacitor?
Simply put, it means that WFC-A can pass the THB 1000h dual 85 test, also known as the dual 85 capacitor.
https://www.weetcap.com/Plastic-Film-Capacitors/WEET-WFCA-THB-X2-85C-Metallized-Polypropylene-Film-Capacitor-275V-305V-310VAC.html
This test may seem simple, but for X2 safety capacitors, it is still difficult to pass because the two biggest factors affecting the lifespan of X2 capacitors are high temperature and humidity. Working in such an environment, ordinary X2 safety capacitors will quickly break down and have a short lifespan.
Some electrical appliances are used in harsh environments, such as smart meters used outdoors, which may face high temperatures and humidity. In this case, THB type X2 safety capacitors must be used.
Characteristics and functions of THB type X2 safety capacitor:
Optimized series X2 certified type, using polymer polypropylene film medium, thickened metalized electrode, fully automatic spray welding process, 94V0 flame retardant PBT plastic shell, moisture resistant epoxy resin sealing, CP wire lead out. High voltage resistance, moisture and heat resistance, low capacitance drop, specifically designed for resistive capacitive voltage reduction circuits, such as LED driver modules, electric meters, small household appliances and other low-power electronic consumer products. The product can pass the THB1000h dual 85 test.
Compared to ordinary X2 capacitors, it has better high temperature resistance and high humidity performance, but the disadvantage is that the price will be slightly higher.
Safety capacitors are mainly capacitors that require safety certification before they can be used. Currently, the main safety capacitors are: X1 safety capacitor, X2 safety capacitor, and Y1 and Y2 safety capacitors. Some people want to know if x2 is a safety capacitor?
The answer is affirmative: X2 is one of the safety capacitors, and its usage is particularly large. Although X1 is also a safety capacitor, its usage is relatively small. There are actually many types of X2 safety capacitors, and different types of X2 capacitors have very different functions. Below we will introduce them one by one:
1. X2 safety capacitor for suppressing power electromagnetic interference
This is the most typical use of X2 capacitor, which is commonly used to suppress power electromagnetic interference. It mainly uses polymer polypropylene film dielectric, thickened metalized electrode, fully automatic spray welding process, 94V0 flame retardant PBT plastic shell, epoxy resin sealing, high voltage resistance, and strong transient pulse voltage withstand ability. Widely used in power supply parallel cross line circuits to suppress electromagnetic interference.
2. X2 safety standard capacitor for capacitive divider power supply
Another common function of X2 capacitors is to reduce voltage through resistance and capacitance. In some small home appliance controls and smart meters, using capacitors for voltage reduction is simpler and more cost-effective than using transformers. X2 capacitors are specifically designed for resistance and capacitance voltage reduction circuits, using polymer polypropylene film dielectric, thickened metalized electrodes, fully automatic spray welding technology, 94V0 flame-retardant PBT plastic shell, moisture resistant epoxy resin sealing, and CP wire lead out. High voltage resistance, moisture and heat resistance, low capacitance drop, specifically designed for capacitive divider power supply circuits, such as LED driver modules, electric meters, small household appliances and other low-power electronic consumer products.
3. Double 85 type X2 safety capacitor, X2 Heavy Duty Series Safety Capacitors
The double 85 X2 capacitor is also used for resistance capacitance voltage reduction, but its performance is better and can pass the THB1000h double 85 test. It is used in some circuits with harsh operating environments, such as smart meters, which are mainly used outdoors to withstand high temperature and high humidity environments. Therefore, the double 85 X2 capacitor must be used. It has high voltage resistance, moisture resistance, and low capacitance drop, and is specifically designed for resistive capacitive voltage reduction circuits, such as LED driver modules, electric meters, small household appliances, and other low-power electronic consumer products. The product can pass the THB1000h dual 85 test.
4. RC parallel and series X2 capacitors
This type of X2 capacitor has a unique internal structure, with a resistor connected in parallel or series. The RC parallel type X2 capacitor is composed of an internal parallel connection between the X2 capacitor and the discharge resistor, and has excellent flame retardant performance. Widely used in anti-interference applications such as power lines. The RC series X2 capacitor has good noise suppression, energy peak absorption, and damping effects.
The X2 capacitor of the THB series is specifically designed for capacitive divider circuits connected in series with 100-240VAC power supplies, such as electric meters, LED driver modules, etc. Its biggest advantage is smaller capacity attenuation, better resistance to high temperatures and humidity, and significantly better performance than ordinary anti-interference X2 safety capacitors.
THB MKP-X2 Polypropylene Film Capacitors for EMI Suppression (THB Grade IIIB: 85C, 85% R.H., 1,000h)
High stability of capacitance under sever ambient condition, such as high temperature and high humidity
1. Internally wrapped with metalized polypropylene film.
2. Excellent self-healing performance, able to withstand surge voltage impact.
3. Excellent capacitance stability under long-term load, with significantly less capacity decay, and longer lifespan when used in capacitive divider power supply circuits.
4. Excellent moisture resistance, high humidity resistance, and can also be used in some harsh environments.
5. Excellent flame retardant performance.
6. Excellent capacity stability for long-term application in harsh environments such as high temperature and humidity.
In summary: THB series X2 safety capacitors belong to the optimized series X2 certification type, using polymer polypropylene film dielectric, thickened metalized electrodes, fully automatic spray welding process, 94V0 flame retardant PBT plastic shell, moisture resistant epoxy resin sealing, and CP wire lead out. High voltage resistance, moisture and heat resistance, low capacitance drop, specifically designed for capacitive divider power supply circuits, such as LED driver modules, electric meters, small appliances and other low-power electronic consumer products. The product can pass the THB 1000h 85C test.
WQS-OSC7050 SMD crystal oscillator has wide frequency, compact and thin metal package, suitable for reflow soldering, low noise, low power consumption, built-in CMOS device integrated circuit with tri-state function, 5V and 3.3V power supply mode. Very suitable for personal computers, notebooks, PCMCIA cards, PDAs, portable products, wireless network cards, pagers, Bluetooth, wireless, communication devices, Internet of Things, smart equipment, automotive electronics, etc.
https://www.weetcap.com/Crystals-Oscillators/WEET-SMD-Oscillator-WQS-OSC7050.html
WQS-OSC7050 crystal oscillator product parameters:
Frequency range: 1.000MHz ~ 160.000MHz
Adjustment frequency difference: +/-30ppm, +/-50ppm
Load voltage: 1.8V, 2.5V, 3.3V, 5.0V)
Operating temperature: -20℃ ~ +70℃, -40℃ ~ +85℃
What is the difference between WQS-SMD7050 crystaland WQS-OSC7050 oscillator?
"SMD" is the abbreviation of Surface-Mount Device, and "7050" refers to the size of this crystal, which is 7.0 x 5.0 mm.
Usually, WQS-SMD7050 crystal refers to crystal resonator (passive crystal), while WQS-OSC7050 oscillator refers to crystal oscillator (active oscillator). As the clock source in electronic devices, WQS-SMD7050 crystal and WQS-OSC7050 oscillator provide accurate clock signals for electronic devices.
In electronics, circuits containing transistor components are usually called "active circuits" (such as active speakers, active filters, etc.), while circuits composed only of resistors and capacitors are called "passive circuits". The crystal in computers are also divided into two types: passive crystal and active crystal oscillator. A passive crystal is a non-polar component with 2 pins. It needs the help of a clock circuit to generate an oscillation signal and cannot oscillate by itself. An active crystal oscillator has 4 pins and is a complete oscillator, which, in addition to a quartz crystal, also contains transistors and resistors and capacitors.
The WQS-OSC5032, a product of WEE Technology Company Limited, a Chinese high-quality brand crystal oscillator manufacturer, is a small SMD sealed clock crystal oscillator with high stability, low jitter, low power consumption and other characteristics. Its supply voltage range is 1.8V-5.0V (1.8V, 2.5V, 3.3V, 5.0V). The storage temperature range is -55~+125 ℃, and the output frequency range is 1.000-160.000MHz. It is mainly used in wireless communication devices and PDAs.
WQS-OSC5032 Features:
1. SMD metal package
2. High precision and high stability
3. Excellent environmental resistance
4. Green and environmentally friendly products, RoHS and Pb Free certified
5. Taping packaging, suitable for automatic installation, meeting the reflow temperature curve requirements of Pb-free soldering
6. Main application areas: computers, servers, network communications, digital home appliances, industrial detection, etc.
WEE Technology Company Limited focuses on providing one-stop crystal oscillator product solutions. Its main products include Leaded Quartz Crystal, SMD Quartz CCrystal, SMD Crystal Oscillators, 32.768KHz Cylindrical Tuning Fork Crystal, 32.768KHz SMD Tuning Fork Crystal, etc. WEET always adheres to quality as the cornerstone, and in order to meet the high standards of customers, our company actively integrates the supply chain to truly serve every valued customer.
OSC is the abbreviation of Oscillator in English.
WQS-OSC3225 crystal oscillator usually refers to a crystal oscillator with a package size of 3.2*2.5mm, also known as clock oscillator.
Unlike resonators that require an oscillation circuit to be built, OSC (oscillator) already contains an oscillation circuit and can output frequency when powered on. The advantages of OSC active crystal oscillator are simple circuit application and stable output frequency. It is mainly used in mid-to-high-end digital smart devices: Bluetooth, wireless, communication devices, Internet of Things, smart equipment, automotive electronics, etc.
https://www.weetcap.com/Crystals-Oscillators/WEET-SMD-Oscillator-WQS-OSC3225.html
Is OSC an active crystal oscillator or a passive crystal oscillator?
Crystal oscillator belongs to the active series. It is an energy conversion device that can convert DC power into AC power with a certain frequency. The circuit it constitutes is called an oscillation circuit (Oscillation).
Crystal oscillators are generally surface-mount four-pin packages with a clock circuit inside. They only need power to generate oscillation signals (mainly CMOS square waves). Generally divided into several packaging forms such as OSC7050, OSC5032, OSC3225, OSC2520 and OSC2016.
WQS-OSC3225 active crystal oscillator features:
High precision and high frequency stability
Compatible with multiple voltages (1.8V, 2.5V, 3.3V, 5.0V)
Can reach industrial temperature -40℃~+85℃
Compliant with RoHS standards/Pb Free
WQS-7Z7050 differential crystal/low phase jitter crystal/router crystal, compared with ordinary crysta, the current and voltage can reach low values1.8V, 2.5V, 3.3V, with low voltage, low jitter, low power consumption and other characteristics. As a high-demand, high-tech quartz crystal in the current industry, the differential crystal has the characteristics of low phase and low loss. The differential patch crystal can easily identify small signals when used in products, and can easily and accurately process "bipolar" signals. It is highly immune to external electromagnetic interference (EMI).
https://www.weetcap.com/Crystals-Oscillators/WEET-Differential-Crystal-Oscillator-WQS-7Z7050.html
Many consumers and battery-driven IoT devices use SoC chips, which usually need to be synchronized. Such chips usually have an integrated oscillation circuit inside, and only need to be connected to a quartz lens. At this time, it is more appropriate to choose a crystal (Xtal).
WQS-7Z7050 differential LVPECL/LVDS/HCSL output active crystal is mainly used in optical fiber communication, Gigabit network, serial ATA, SCSI, high-end servers, computer peripherals, PCI-Express, SDH, SONET, broadcast services, mobile communications, base stations, network equipment and other electronic products and applications.
Common points of all crystals:
1. Shock resistance
Shock resistance means that the product crystal may be damaged under certain conditions, such as falling from the table, hitting, high-altitude throwing or impact during the mounting process. If the product has been impacted, please do not use it, because no matter what kind of crystal product, its internal chip is made of quartz crystal, and falling from high altitude will cause adverse effects on the crystal.
2. Radiation
Exposure to radiation can cause product performance to be impaired, so avoid prolonged exposure to sunlight
3. Chemical/pH environment
Do not use or store these products in an environment where the pH range may corrode or dissolve the product or packaging materials
4. Adhesives
Do not use adhesives that may corrode the packaging materials, terminals, components, glass materials, and vapor deposition materials used in the product. (For example, chlorine-based adhesives may corrode the metal "lid" of a crystal unit, thereby destroying the seal quality and reducing performance.)
5. Halogen compounds
Do not use the product in a halogen gas environment. Even small amounts of halogen gas, such as chlorine in the air or in metal parts used for packaging, may cause corrosion. At the same time, do not use any resin that releases halogen gas
6. Static electricity
Excessive static electricity may damage the product. Please pay attention to anti-static conditions. Please choose conductive materials for containers and packaging materials. When handling, please use a welding gun and a measurement circuit without high voltage leakage, and perform grounding operations.
