The inverter circuit is composed of a power frequency oscillator, a push-pull amplifier circuit, a transformer boost circuit, and the like, and is used not only as an inverter but also as a charger. The whole circuit is as shown below:
The circuit structure is relatively simple. The power frequency oscillation signal source is composed of a 555 time base circuit, and the square wave output of the 3-pin is used to drive the push-pull amplifier circuit. The push-pull amplification consists of two sets of three 3DD15 low-frequency high-power triodes, which finally drive the inverter to complete the inverter boost.
555 and R1. A 50 Hz astable multivibrator composed of R2, C1, etc., with an oscillation frequency of f = 1.44 / (R1 + 2R2) C1. When switch K1 is turned to the inverter position, VT8 is saturated and the battery DC voltage is applied to the 555 and VT1 circuits, and 555 starts to oscillate. The oscillating square wave outputted by 555 is added to VT5, VT6, and VT7 all the way. After one phase is inverted by VT1, VT2, VT3, and VT4 are pushed, and a square wave is synthesized on the side of transformer L1, and is boosted.
When the switch K1 is hit to the charging position, the mains is turned on, and the battery is charged after being stepped down by the transformer.
1. Why fiberglass antenna is not suitable for indoor use? A: Many people may have noticed that international brands such as Linksys or DLink typically use only 7dB, 5dB and 2dB antennas, while 9dB or higher gain indoor omnidirectional antennas are rarely seen in the market. As far as we know, the 7dB antenna has fully met the requirements of indoor use. The antenna above 7dB has been used. Due to the small Angle, it cannot give full play to its advantages. Therefore, we recommend using an omnidirectional antenna above 9dB for outdoor use. As for someone, it is good to say indoor wall effect, this statement is unable to prove, also need not believe too much. 2. Why are omnidirectional antennas and perpendicular angles called? A: Generally speaking, an omnidirectional antenna is an antenna with a horizontal radiation Angle of 360 degrees and a vertical sector. The Angle is usually around 6 ~ 15 degrees. The higher the gain, the smaller the vertical Angle. For example, the radiation Angle of the 9dB antenna can be about 14 degrees, while the radiation Angle of the FRP antenna can be about 8 degrees as the limit
868MHZ Fiber Glass Antenna ,915MHZ Fiber Glass Antenna ,LoRa Gateway Antenna ,Wifi Antenna ,Fiber Glass Antenna
Yetnorson Antenna Co., Ltd. , https://www.xhlantenna.com