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.
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