In the early days of LED lighting, the AC high-voltage mains power was converted into a low-voltage power source to drive the LED light source. The circuit principle basically uses the current limiting resistor R to limit the strong inrush current flowing through the LED light source to protect the LED light source from safely emitting light. Obviously, this technology is to replace the power efficiency for the safety of the LED light source. The smaller the resistance of the current limiting resistor R is, the worse the safety is. The greater the resistance of R, the greater the safety. LED lighting brings the disadvantages of high cost, many faults, low power consumption efficiency, and dead lights. The drive power has been improved and modified many times, but the shortcomings still exist.
I have done a lot of data collection, analysis and testing on LED lighting and in-depth analysis by electronic circuit theory to find out the mechanism of LED string light source driven by AC high voltage power supply, adopting the commonly used method of “avoiding its edgeâ€. The Chinese patent name is LED power-on lighting circuit, the application number is 201010193525.3, which is a zero-crossing power switch. When the instantaneous value of the AC high-voltage mains power supply is zero (also known as zero-crossing), the AC high-voltage power supply and the LED string are connected. The instantaneous value of the AC high-voltage mains power supply, which is added to the LED light source at the moment of turning on, is the zero-crossing voltage. The zero-crossing voltage of the different brands of zero-crossing power switches is different, but they are all within 0~25 volts. The LED string light source will be damaged. After the LED string light source is turned on, all the LEDs enter the response state within 1 microsecond, and the LED string light source has the "mass power" to jointly undertake the high voltage safety power-on illumination.
The composition of the LED illumination lamp (referred to as the patented lamp) of the invention patent is: AC high-voltage mains power supply u1 (220V 50HZ), rectifier bridge, zero-crossing power switch, LED string light source, current limiting circuit five parts. (Refer to Figure 1) The rectifier bridge converts u1 to 100 positive half-cycles of pulsating DC voltage per second. The traditional technology sacrifices the power efficiency for the safety of the LED light source. The AC high-voltage power supply uses a zero-crossing power switch, which does not damage the LED string. The light source, together with the "mass power", bears the high-voltage safe passage of light.
U2, you can choose to buy a few micro-products with one dollar; the zero-crossing power switch can use a small zero-crossing power switch integrated block, or you can use a small semiconductor voltage control integrated block and a three-pole switch. These small and fine components are widely used. The international brand name can be used for a long time for decades. The entire zero-crossing power switch component costs about three yuan, and its volume is smaller than one-fourth of the mobile phone battery; the LED string light source is the illuminant. According to the requirements of the Ming Dynasty, select the appropriate power and quantity of LEDs in a reasonable series and parallel connection; the current limiting circuit can be selected with a simple PTC current limiting, or the power limiting current limiting mode can be used to achieve current limiting by increasing or decreasing the number of LEDs. Constant current circuit can also be selected, which method should be selected according to lighting requirements.
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For more information, please refer to: "High-tech LED - Technology and Applications" August issue
The name of wireless router can be separated out of two keywords: wireless and routing. Understand the technical principle behind these two words, you understand the wireless router.
Wireless is also what we often call Wi-Fi. Wireless routers can convert home broadband from wired to wireless signals, and all devices can happily surf the Internet as long as they connect to their own Wi-Fi. In addition, these devices also form a wireless local area network, where local data is exchanged at high speed and is not limited by the bandwidth of home broadband.
For example, many people have smart speakers in their homes that can be used to control various smart appliances. When you say small X small X, turn on the TV, the speaker actually finds the TV through the LAN and sends instructions, and does not need to connect to the Internet; And if you let it broadcast news, you have to get data through the Internet.
The Local Area Network we talked about earlier, also known as the Intranet, is represented by the Local Area Network (LAN) on the router, so the Wi-Fi signal is also called WLAN(Wireless LAN); The Internet we want to access, also known as the extranet, is represented on the router by the WAN(Wide Area Network).
On the Intranet, the IP address of each device is different, which is called a private address. All devices on the Internet share the same public address, which is assigned by broadband operators such as China Telecom Unicom.
The router is the bridge between the Intranet and the external network. The above mentioned IP address translation, packet forwarding, is the router routing function.
In other words, the router is the hub of the home network, and the data of all the devices must be forwarded through it to access each other or reach the external network, which means that one husband is the key and ten thousand men are not open, so the comprehensive router is also called "home gateway".
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