US3906331A — DC to DC converter with linear pulse processing c…

Claim 1

Independent Claim 204 words

A modulator circuit for application in signal sensing arrangements comprising, means to accept analog signals, means to accept a reference signal, a differential amplifier including a first input connected to said means to accept analog signals and a second input connected to said means to accept a reference signal, a sawtooth wave generator including means to accept a synchronizing signal, a comparator including a first input connected to the output of said differential amplifier and a second input connected to the output of said sawtooth wave generator, and a feedback circuit coupling the output of said comparator to said first input connected to said means to accept analog signals and including a constant current source, a switch having a main conduction path coupled to said constant current source and connected to control the application of current by said constant current source to said first input connected to said means to accept analog signals, and means to control said switch responsive to the output of said comparator whereby the current of the current source is balanced against the current input of said means to accept analog signals so that the output of said modulator circuit is insensitive to changes in frequency of the synchronizing signal.

Claim 2

Dependent Claim 204 words

A modulator circuit for application in signal sensing arrangements comprising, means to accept analog signals, means to accept a reference signal, a differential amplifier including a first input connected to said means to accept analog signals and a second input connected to said means to accept a reference signal, a sawtooth wave generator including means to accept a synchronizing signal, a comparator including a first input connected to the output of said differential amplifier and a second input connected to the output of said sawtooth wave generator, and a feedback circuit coupling the output of said comparator to said first input connected to said means to accept analog signals and including a constant current source, a switch having a main conduction path coupled to said constant current source and connected to control the application of current by said constant current source to said first input connected to said means to accept analog signals, and means to control said switch responsive to the output of said comparator whereby the current of the current source is balanced against the current input of said means to accept analog signals so that the output of said modulator circuit is insensitive to changes in frequency of the synchronizing signal.

Claim 3

Dependent Claim 99 words

A modulator circuit as defined in claim 1 wherein said means to accept analog signals and said means to accept a reference signal comprises, a sensing impedance, a first, second, third, and fourth impedance connected in series, the series connected impedances being connected in parallel with said sensing impedance, a voltage breakdown diode connected in parallel with said third and fourth impedances, the junction of said first and second impedances being connected to the first input of said differential amplifier and the junction of said third and fourth impedances being connected to the second input of said differential amplifier.

Claim 4

Dependent Claim 99 words

A modulator circuit as defined in claim 2 further including means to derive circuit energizing bias signals from analog signals being sensed in said sensing impedance comprising, a second voltage breakdown diode connected in series with said sensing impedance, the junction of said sensing impedance and one terminal of said second voltage breakdown diode and the other terminal of said second voltage breakdown diode being coupled across the circuits of said modulator circuit to be energized, and means to return the bias signal derived from said second voltage breakdown diode to a circuit in series with said sensing impedance.

Claim 5

Dependent Claim 62 words

A modulator circuit as defined in claim 3 further including, means to return the signal drained from the path of said sensing impedance by said means to accept analog signals to a circuit in series with said sensing impedance comprising a fifth impedance interconnecting a junction of said second and third impedances with said other terminal of said second voltage breakdown diode.

Claim 6

Dependent Claim 70 words

A modulator circuit as defined in claim 1 further including, an output circuit comprising a pulse transformer including a primary and a secondary windinG, said primary winding coupled to the output of said comparator and a first steering diode to transmit pulses of one polarity corresponding to the pulse output of said modulator, and a second steering diode to transmit pulses of an opposite polarity corresponding to said synchronizing signal.

Claim 7

Dependent Claim 64 words

A modulator circuit as defined in claim 1 wherein, said switch comprises a transistor whose collector-emitter path couples said constant current source to said first input connected to said means to accept analog signals, and said means to control said switch comprises means responsive to the polarity of the output of said comparator to control the biasing of the control electrode of said transistor.

Claim 8

Dependent Claim 162 words

A modulator circuit as defined in claim 1 wherein said means to accept analog signals and said means to accept a reference signal comprise, a sensing impedance, a steering diode, and a first, second, third, and fourth impedance connected in a series circuit, the series circuit connected in parallel with said sensing impedance, a voltage breakdown diode connected in parallel with said third and fourth impedances, the junction of said steering diode and said second impedance being connected to the first input of said differential amplifier, and the junction of said third and fourth impedances being connected to the second input of said differential amplifier, a second voltage breakdown diode connected in series with said sensing impedance, a transistor having its collector-emitter path interconnecting the junction of said first impedance and said steering diode with the junction of said sensing impedance and said second voltage breakdown diode, and the control electrode of said transistor being coupled to the output of said comparator.

Claim 9

Dependent Claim 169 words

Signal processing circuitry for a DC to DC converter comprising, means to sense the signal outputs of said converter, a source of synchronizing signals, means to generate pulse position modulated signals whose delay in time relative to said synchronizing signals is proportional to the signal outputs sensed by said means to sense including a differential amplifier having its differential inputs responsive to the magnitude of the signal output sensed by said means to sense, a comparator to generate a modulated pulse whose width is proportional to the output of said differential amplifier, and means to differentiate said modulated pulse to generate said pulse position modulated signal, feedback means coupling the output of said comparator to the input of said differential amplifier to compensate for variations in the frequency of said source of synchronizing signals comprising, a current source, gating means controlling the application of said current source to the input of said differential amplifier, and means to enable said gating means in response to the output of said comparator.

Claim 10

Dependent Claim 169 words

Signal processing circuitry for a DC to DC converter comprising, means to sense the signal outputs of said converter, a source of synchronizing signals, means to generate pulse position modulated signals whose delay in time relative to said synchronizing signals is proportional to the signal outputs sensed by said means to sense including a differential amplifier having its differential inputs responsive to the magnitude of the signal output sensed by said means to sense, a comparator to generate a modulated pulse whose width is proportional to the output of said differential amplifier, and means to differentiate said modulated pulse to generate said pulse position modulated signal, feedback means coupling the output of said comparator to the input of said differential amplifier to compensate for variations in the frequency of said source of synchronizing signals comprising, a current source, gating means controlling the application of said current source to the input of said differential amplifier, and means to enable said gating means in response to the output of said comparator.

Claim 11

Dependent Claim 137 words

Signal processing circuitry as defined in claim 8 wherein said means to sense the signal outputs comprises, a signal sensing impedance connected in a main conduction path of said converter, a first, second, third, and fourth impedance connected in a series circuit, said series circuit shunting said sensing impedance, the junction of said first and second impedances being coupled to an inverting input of said differential amplifier, the junction of said third and fourth impedances being coupled to a noninverting input of said differential amplifier, a voltage breakdown diode shunting said third and fourth impedances, and a fifth impedance coupling the junction of said second and third impedances to the main conduction path of said converter, whereby the sensing signal used to actuate the signal processing circuitry is returned to the main conduction path of the converter.

Claim 12

Dependent Claim 160 words

Signal processing circuitry as defined in claim 8 wherein said means to sense includes a sensing impedance coupled to the conduction path of the signal being sensed, a steering diode circuit including a first impedance, a second impedance, a third impedance, and a fourth impedance, said series circuit shunting said sensing impedance, a second shunt connection shunting said third and fourth impedances and including a voltage breakdown diode, the junction of said first impedance and said steering diode being connected to a first input of said differential amplifier, the junction of said third and fourth impedances being connected to a second input of said differential amplifier, and a current drain means having a main conducting path coupling the junction of said steering diode and said second impedance to the junction of said sensing impedance and said voltage breakdown diode, and said fourth impedance and a control electrode of said current drain means coupled to the output of said comparator means.

Claim 13

Dependent Claim 29 words

Signal processing circuitry as defined in claim 10 further including, a compensating diode having a temperature characteristic complementary to said steering diode and included in said second shunt connection.

Claim 14

Dependent Claim 94 words

Signal processing circuitry as defined in claim 8 further including, means to establish reference pulses having selected time delays relative to said synchronizing signal, means to compare the time delay of said pulse position modulated signal with respect to the sequence of said reference pulses, comprising, a plurality of gating means, each gating means individually responsive to different ones of said reference pulses, means to apply said pulse position modulated signal to said plurality of gating means, and alarm indicator means responsive to pulse position modulated signals transmitted by said plurality of gating means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-09-15	1979-03-17	1979-09-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-09-15	1983-03-17	1983-09-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-09-15	1987-03-17	1987-09-16	$7700.00	Window Closed / Lapsed

DC to DC converter with linear pulse processing circuitry

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