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Isolated switching-mode power supply control circuit having secondary-side controller and supervisory primary-side controller
Isolated switching-mode power supply control circuit having secondary-side controller and supervisory primary-side controller
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机译:具有次级侧控制器和监督性初级侧控制器的隔离式开关电源控制电路
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摘要
A primary-side power modulator for an isolated switching-mode power supply operating under secondary-side control comprising a pulse width determining circuit for real-time primary-side adjustment of a PWM control signal received from a secondary-side PWM controller. While accepting pulse width commands from an isolated secondary-side PWM controller, the pulse width determining circuit has the ability to reduce the width of the switching pulse in response to primary-side information. The power modulator may further comprise a start-up circuit for ensuring that the primary-side supply voltage is above a minimum under-voltage lock out threshold, a soft start circuit for controlling the power switch at power-up, a pulse receiver for receiving the PWM control signal generated by the secondary-side PWM controller, and a drive circuit for driving an external solid-state power switch with the adjusted PWM control signal.
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