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The power output circuit diagram with automatic drive mode

2015-03-23 03:26  
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The power output circuit diagram with automatic drive mode
The output voltage of the system in the design is 3.3 V , and it uses automatic drive mode. It usesthe secondary of transformerto drive MOSFET. When the circuit works, the transformer's secondary is in positive hafle circle, V8 is breakover, V9 is turned off, and V8 plays the role of rectifying action. When transformer's secondary is in negative half cycle , V9is breakover, V8isturn off, V9 has the freewheeling function. As shown in Fig, when it works under the condition of 300 kHz , the loss of the synchronous rectifier is conduction loss, and the switching loss is small.