US3735235A — Dc to dc converter with voltage regulation feedba…

Claim 1

Independent Claim 244 words

A DC to DC converter comprising an inverter circuit including two oppositely phased switching devices and an inverter transformer coupled to the two switching devices, a rectifier coupled to the output of said inverter transformer and including two oppositely phased rectifying devices, a voltage regulation control coupled to monitor the rectified voltage output of said rectifier comprising a reference voltage source, means to compare said rectified voltage with said reference voltage and generate an error voltage therefrom, and pulse generation means to generate width modulated pulses responsive to said error voltage, switching control means to periodically switch said oppositely phased switching devices and generating a periodic switching signal output of fixed duration, gating means to couple the switching signal output of said switching control means to said opPositely phased switching devices, a bistable multivibrator having at least one output coupled to said gating means to apply transmission disabling signals thereto, means to periodically set said bistable multi-vibrator, a pulse transformer to differentiate the modulated pulse output of said pulse generation means generating at least pulse spikes corresponding to the trailing edge of said modulated pulse therefrom and intercoupling said pulse generation means to said bistable multivibrator whereby the bistable multivibrator is set in one state by said means to periodically set and reset in its other state by said pulse spike corresponding to the trailing edge of said modulated pulse wherein the reset output of said bistable multivibrator disables transmission through said gating means.

Claim 2

Dependent Claim 244 words

A DC to DC converter comprising an inverter circuit including two oppositely phased switching devices and an inverter transformer coupled to the two switching devices, a rectifier coupled to the output of said inverter transformer and including two oppositely phased rectifying devices, a voltage regulation control coupled to monitor the rectified voltage output of said rectifier comprising a reference voltage source, means to compare said rectified voltage with said reference voltage and generate an error voltage therefrom, and pulse generation means to generate width modulated pulses responsive to said error voltage, switching control means to periodically switch said oppositely phased switching devices and generating a periodic switching signal output of fixed duration, gating means to couple the switching signal output of said switching control means to said opPositely phased switching devices, a bistable multivibrator having at least one output coupled to said gating means to apply transmission disabling signals thereto, means to periodically set said bistable multi-vibrator, a pulse transformer to differentiate the modulated pulse output of said pulse generation means generating at least pulse spikes corresponding to the trailing edge of said modulated pulse therefrom and intercoupling said pulse generation means to said bistable multivibrator whereby the bistable multivibrator is set in one state by said means to periodically set and reset in its other state by said pulse spike corresponding to the trailing edge of said modulated pulse wherein the reset output of said bistable multivibrator disables transmission through said gating means.

Claim 3

Dependent Claim 129 words

A DC to DC converter as defined in claim 1 wherein said rectifying devices comprise first and second rectifying transistors, first and second bias transformer associated with said first and second rectifying transistors respectively and each comprising a first winding connected to the collector of said rectifying transistor, a second winding connected to the base of said rectifying transistor and oriented with respect to said first winding to transform collector current into base drive current to turn on said rectifying transistor and a diode shunting the collector emitter path and poled in the forward current direction of said rectifying transistor and connected in series with said first winding, wherein current conducted by said diode is transformed into a base drive current to cause the turnon of said rectifying transistor.

Claim 4

Dependent Claim 73 words

A DC to DC converter as defined in claim 2 wherein said bias transformer includes a third winding connected to said switching control whereby said switching control applies turn-off signal to said third winding, said third winding having a turns ratio relation with said first winding to balance and overcome current transmitted by said diode in addition to supplying a reverse bias signal to said second winding to turn off said rectifying transistor.

Claim 5

Dependent Claim 77 words

A DC to DC converter as defined in claim 1 wherein said switch control means comprises a clock source, a plurality of cascaded toggle connected J-K flip-flops each driving the toggle input of the succeeding flip-flop with its first state output, a NOR gate, the second complementary state outputs of the plurality of cascaded flip-flops all being connected in parallel to said NOR gate and the output of said NOR gate being connected to said gating means.

Claim 6

Dependent Claim 43 words

A DC to DC converter as defined in claim 4 wherein said means to compare and generate an error voltage comprises an emitter coupled differential amplifier wherein the voltage to be monitored is coupled to the common emitter junction of the differential amplifier.

Claim 7

Dependent Claim 229 words

A DC to DC converter circuit comprising an inverter circuit including: a power transformer having a primary and a secondary winding, a pair of switching devices connected to said primary winding, output terminals coupled to said secondary winding, a voltage regulation means coupling the output terminals to said switching devices, said voltage regulation means comprising a switching control means connected to operate said switching devices, a pulse transformer connected between said output terminals and said switching devices to provide DC isolation therebetween, a reference voltage and a voltage error detector connected to said output terminals and generating an error signal proportional to the difference between the reference voltage and the voltage at said output terminals, means to generate a width modulated pulse whose duration is responsive to said error signal, means to synchronize the generation of said modulated pulse with the switching of said pair of switching devices, said means to generate a width modulated pulse coupling said output terminals to said pulse transformer wherein said pulse tRansformer differentiates said modulated pulse to produce a timing pulse therefrom, and said switching control means including a bistable multivibrator connected between said pulse transformer and said switching devices and responsive to said timing pulse, said multivibrator generating a second width modulated pulse having the same duration as said first width modulated pulse, to control the conductive duration of said switching devices.

Claim 8

Dependent Claim 229 words

A DC to DC converter circuit comprising an inverter circuit including: a power transformer having a primary and a secondary winding, a pair of switching devices connected to said primary winding, output terminals coupled to said secondary winding, a voltage regulation means coupling the output terminals to said switching devices, said voltage regulation means comprising a switching control means connected to operate said switching devices, a pulse transformer connected between said output terminals and said switching devices to provide DC isolation therebetween, a reference voltage and a voltage error detector connected to said output terminals and generating an error signal proportional to the difference between the reference voltage and the voltage at said output terminals, means to generate a width modulated pulse whose duration is responsive to said error signal, means to synchronize the generation of said modulated pulse with the switching of said pair of switching devices, said means to generate a width modulated pulse coupling said output terminals to said pulse transformer wherein said pulse tRansformer differentiates said modulated pulse to produce a timing pulse therefrom, and said switching control means including a bistable multivibrator connected between said pulse transformer and said switching devices and responsive to said timing pulse, said multivibrator generating a second width modulated pulse having the same duration as said first width modulated pulse, to control the conductive duration of said switching devices.

Claim 9

Dependent Claim 68 words

A DC to DC converter as defined in claim 6 wherein said switching control means comprises a clock source, means to derive a periodic pulse from said clock source at a lower frequency, and gating means to couple said periodic pulse to drive said switching means and means to connect said multivibrator to said gating means whereby said gating means is disabled in response to said timing pulse.

Claim 10

Dependent Claim 132 words

A DC to DC converter as defined in claim 6 wherein a rectifier including first and second oppositely phased synchronous rectifying transistors interconnects said secondary winding to said output terminal, first and second proportional transformer base drive arrangement to drive said first and second synchronous rectifying transistors, each of said proportional transformers including a first winding connected to the collector of said rectifying transistor, a second winding connected to the base of said rectifying transistor, whereby the collector current is transformed into a base drive current, a diode shunting the collector emitter path of said rectifying transistor and poled in the direction of the forward current flow of the rectifying transistor and connected in series with said first winding whereby current conducted by said diode is transformed into a base drive current.

Claim 11

Dependent Claim 32 words

A DC to DC converter as defined in claim 8 wherein said proportional transformer further includes a third winding coupled to said switching control to apply turn-off signals to said rectifying transistor.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-05-21	1976-11-20	1977-05-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-05-21	1980-11-20	1981-05-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-05-21	1984-11-20	1985-05-22	$7700.00	Window Closed / Lapsed

Dc to dc converter with voltage regulation feedback loop achieving isolation between input and output by time domain techniques

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