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 Wysłany: Śro 22:46, 06 Kwi 2011 Temat postu: A half-bridge zero-voltage switch circuit of _3296 |
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A half-bridge zero-voltage switch circuit of
Implementation of zero voltage switching . Usually the transformer type ZVS-QRC circuit, most of the use of transformer leakage inductance L / eak as the resonant inductor , or coil in the transformer primary side series resonant inductor Si , port J} ( or Si ) and the switch capacitance and junction capacitance of the absorption components Resonant circuit , before the switch opened , the terminal voltage through the resonant circuit resonant to zero. Port J} ( or Si ) can not be too small , otherwise difficult to achieve zero voltage switching , because the switch before the opening of its terminal voltage is stored in the mouth by J} ( or Si ) in the energy resonant to zero , the port J} (Or Si ) is too small, the stored energy is too small to switch the terminal voltage of resonance to zero L2.3J. 3 Conclusion In this paper, a zV1 ' a half-bridge PWM inverter circuit topology, from the circuit simulation and experiment can be the following conclusions: the general ZVS-QRC circuit , there is zero voltage switching duty cycle adjustment range And the load range and limited , and the use zV1 ' a PWM topology ,[link widoczny dla zalogowanych], although the control logic and circuit complexity of some, but performance has improved in many respects , the circuit discussed in this article has the following characteristics: ( 1 ) in the duty cycle is 0 .64 below the load can be achieved for all zero-voltage switching, the maximum duty cycle of 0.8, the opening of greatly reduced when the tube voltage . Shows that the circuit duty cycle to achieve zero voltage switching regulator greater range and load range . (2 ) As the load current decreases, the duty cycle to achieve zero voltage switching increases , that this circuit is easy to achieve in light load, zero- voltage switching , which is an ordinary ZVS-QRC circuit is the opposite . (3 ) the realization of zero- voltage switching is not limited the size of the transformer leakage inductance , this sense, the transformer leakage inductance can be minimized , thereby improving transmission efficiency transformers , reducing the absorption of circuit switch and the pressure level and Power consumption.
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