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US 6,069,802 AGranted
Transformer isolated driver and isolated forward converter
OwnerRobert A. Priegnitzinventor
Life of this patent
Estimating the term…
Abstract
A DC-DC converter has a main forward converter stage with a snubber at a source side and a sample and hold circuit at a load side. Feedback is provided by a pulse width modulated controller connected at the load side, which feeds an isolation transformer via a differentiating capacitor. The isolation transformer has its output connected to a pulse regenerator which feeds a driver and a volt-time limiter that connects to a main switch at the source side of the forward converter.
Claims9
A DC-DC driver circuit, comprising:
- an isolation transformer having input and output windings;
- a differentiating capacitor connected in series at the input winding of said isolation transformer, and
- a pulse regenerator connected across the output winding of said isolation transformer, said pulse regenerator including:
- a transistor having a base connected at a first lead of said output winding,
- a first rectifier connected between a second lead of said output winding and an emitter of said transistor,
- a capacitor connected between said base of said transistor and a collector of said transistor, and
- a second rectifier connected between said collector and said emitter of said transistor.
4 more elements
A power converter, comprising:
- a converter having a source side and a load side;
- a power switch connected to said input side;
- a pulse width modulated controller having an input connected to said load side and an output;
- an isolated driver between said pulse-width modulated controller and said power switch, said isolated driver including:
- a differentiating network to convert a rectangular pulse from said pulse width modulated controller to a series of differentiated pulses, said differentiated pulses being exponentially decaying positive and negative pulses coincident respectively with rising and falling edges of the rectangular pulse;
- an isolation transformer connected to said differentiating network;
- and
- a pulse regenerator connected between said isolation transformer and said power switch which reconstructs the differentiated pulses into a reconstructed rectangular pulse to drive said power switch.
5 more elements
A power converter comprising:
- a forward converter having a source side and a load side;
- a feedback loop connected between said source side and said load side, said feedback loop including:
- a pulse width modulated controller having an input connected to said load side and an output;
- an isolation transformer having a first winding connected to said output of said pulse width modulated controller and having a second winding;
- a pulse regenerator connected to said second winding of said isolation transformer, an output of said pulse regenerator connected to said source side of said forward converter, and
- a differentiating capacitor connected between said pulse width modulated controller and said isolation transformer.
3 more elements
A power converter comprising:
- a forward converter having a source side and a load side;
- a feedback loop connected between said source side and said load side, said feedback loop including:
- a pulse width modulated controller having an input connected to said load side and an output;
- an isolation transformer having a first winding connected to said output of said pulse width modulated controller and having a second winding;
- a pulse regenerator connected to said second winding of said isolation transformer, an output of said pulse regenerator connected to said source side of said forward converter;
- and
- a snubber connected at an input of said forward converter.
4 more elements
A power converter, comprising:
- a forward converter having a source side and a load side, said forward converter including
- a synchronous rectification circuit at said load side;
- a feedback loop connected between said source side and said load side, said feedback loop including:
- a pulse width modulated controller having an input connected to said load side and an output;
- an isolation transformer having a first winding connected to said output of said pulse width modulated controller and having a second winding;
- a pulse regenerator connected to said second winding of said isolation transformer, an output of said pulse regenerator connected to said source side of said forward converter, and
- a sample and hold circuit connected to control said synchronous rectification circuit, a control input of said sample and hold circuit being connected to an output of said pulse width modulated controller.
4 more elements
A power converter, comprising:
- a forward converter having a source side and a load side;
- a feedback loop connected between said source side and said load side, said feedback loop including:
- a pulse width modulated controller having an input connected to said load side and an output;
- an isolation transformer having a first winding connected to said output of said pulse width modulated controller and having a second winding;
- and
- a pulse regenerator connected to said second winding of said isolation transformer, an output of said pulse regenerator connected to said source side of said forward converter, said pulse regenerator including:
- a transistor having a base connected at a first lead of said output winding,
- a first rectifier connected between a second lead of said output winding and an emitter of said transistor,
- a capacitor connected between said base of said transistor and a collector of said transistor, and
- a second rectifier connected between said collector and said emitter of said transistor.
7 more elements
A power converter, comprising:
- a forward converter having a source side and a load side, said forward converter including a main switch at the source side;
- a feedback loop connected between said source side and said load side, said feedback loop including:
- a pulse width modulated controller having an input connected to said load side and an output;
- an isolation transformer having a first winding connected to said output of said pulse width modulated controller and having a second winding;
- a pulse regenerator connected to said second winding of said isolation transformer, an output of said pulse regenerator connected to said source side of said forward converter, and
- a driver having an input connected at an output of said pulse regenerator and an output connected to drive said main switch.
3 more elements
Dependencies are inferred from the claim text.