Electric power conversion systems – Current conversion – With starting arrangement
Patent
1993-06-09
1995-07-25
Skudy, R.
Electric power conversion systems
Current conversion
With starting arrangement
363 41, H02M 112, H02M 114
Patent
active
054368200
ABSTRACT:
One PWM control circuit is located in the primary side of a power converter and is isolated from the secondary side, and another PWM control circuit is located in the secondary side of the converter and is isolated from the primary side. The first PWM control circuit is powered by a direct tap to the input line of the converter and, during start-up, supplies a low power square wave coupled directly to switching transistors of an inverter of the power converter. After start-up, the second PWM control circuit is powered by a direct tap to the secondary side and supplies a regulating square wave output to the switching transistors through an isolation component such as a coil. After start-up, the primary PWM control circuit is disabled so that, under normal operating conditions, the power supply is regulated only by the second PWM control circuit. The improved power converter has the advantages of direct feedback to the second PWM, without an additional, isolated power supply being required to drive the second PWM.
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Stan Dendinger, "Application Notes-SG1524 Simplifying Converter Design with a New Integrated Regulating Pulse Width Modulator," Silicon General (1990), pp. 12-19 to 12-25.
Reza Amirani, "Application Notes-SG1540 Minimizing the Cost and Complexity of Start-Up Circuits for Switching Power Supplies (1990)", pp.12-105 to 12-111.
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ELDEC Corporation
Skudy R.
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