1) 3 times inspection from material to goods,to low down the defective rate to the minimum,including IV
test ,EL test.
2) All of our solar panel product haves passed the ISO14001,ISO9001,ISO18001,CE,TUV approve.
3) We csn provide solar panel from 5w to 360w,giving you customized service.
4) Sunket using advanced automatic equipment to control product quality.
Product Description
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Solar Panel product's Main Features
Basic understanding and development direction of switching power supply
Switching power supplies are electronic devices that utilize modern power electronics to regulate the on and off time of a switch, ensuring a stable output voltage. Typically, they consist of a Pulse Width Modulation (PWM) control IC and a MOSFET. Compared to linear power supplies, switching power supplies tend to become more expensive as their output power increases, but the rate of cost increase varies depending on the design and application.
At a certain output power level, linear power supplies can be more costly than switching power supplies, which is referred to as the "cost reversal point." As power electronics technology continues to evolve, this reversal point has shifted toward lower power levels, offering greater potential for the development and adoption of switching power supplies.
One of the key trends in switching power supply development is the increasing operating frequency. Higher frequencies allow for smaller and lighter designs, enabling broader applications—especially in high-tech fields. This miniaturization helps reduce the size and weight of advanced products. Additionally, the use of switching power supplies contributes significantly to energy efficiency, resource conservation, and environmental protection.
The main power electronic components used in switching power supplies include diodes, IGBTs, and MOSFETs. SCRs are occasionally used in input rectifier circuits and soft start circuits, while GTRs are rarely used due to their complex drive requirements and low switching frequency. They have largely been replaced by IGBTs and MOSFETs.
There are three essential conditions for a switching power supply:
1. **Switching**: Power electronic devices operate in a switching state rather than a linear mode.
2. **High Frequency**: The devices function at high frequencies instead of near the power line frequency.
3. **DC Output**: The output is direct current (DC) rather than alternating current (AC).
Switching power supplies can be broadly classified into two categories: AC/DC and DC/DC. DC/DC converters have become highly modularized with mature design and manufacturing processes. In contrast, AC/DC modules face more technical challenges during modularization due to their inherent complexity.
In DC/DC conversion, there are several common topologies such as Buck, Boost, Buck-Boost, and Cuk circuits. These are non-isolated configurations. Isolated circuits include forward, flyback, half-bridge, full-bridge, and push-pull topologies. Modern soft-switching technologies have significantly improved efficiency and performance in DC/DC converters. Companies like Vicor and NemicLambda have developed high-performance modules with power densities reaching up to 27 W/cm³ and efficiencies exceeding 90%.
AC/DC conversion involves converting AC to DC, and it allows bidirectional power flow. Rectification refers to power flowing from the source to the load, while active inversion occurs when power flows back to the source. Due to the need for filtering and compliance with safety and electromagnetic compatibility (EMC) standards, AC/DC power supplies are generally larger and more complex than DC/DC systems.
When selecting a switching power supply, several factors should be considered. First, the output current must be carefully calculated based on the maximum load demand. A margin coefficient (typically between 1.5 and 1.8) is usually applied to ensure reliability. Grounding and shielding measures are also important to reduce interference, especially for sensitive equipment. EMC filters are often included to meet regulatory requirements. Lastly, protection features such as overcurrent, overheat, and short-circuit protection are crucial to prevent damage to both the power supply and connected devices.
Looking ahead, the development of switching power supplies will focus on higher frequencies, improved reliability, reduced power consumption, lower noise, better anti-interference capabilities, and greater modularity. Advances in materials, component integration, and soft-switching technologies are driving these improvements. As the industry continues to innovate, switching power supplies will play an increasingly vital role in supporting the growth of high-tech industries and sustainable energy solutions.