US3670233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dc to dc converter
Assignee: AG Communication Systems Corp
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Filing: 1971-04-12
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Granted: 1972-06-13
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Expires: 1991-04-12
Abstract
Abstract A circuit for efficiently converting unregulated direct current voltage into a regulated direct current voltage of lower magnitude across a load in which a capacitor and an inductor are used to store electrical energy with a switch to alternately connect and disconnect the circuit to the unregulated voltage source, the switch being controlled by a circuit in which zener diodes are used to detect variations in regulated voltage and turn the switch ''''on'''' or ''''off'''' in response to rises and falls in load voltage from a predetermined value.
Inventors
- 👤 Neale A Zellmer
- 👤 Wayne B Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/1563
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
334 words
A DC to DC converter that is a two-port network for converting a direct current input voltage from an electrical power source into a regulated direct current output voltage of lower magnitude across a load, comprising an input port having a pair of input terminals for connection across the power source; an output port having a pair of output terminals for connection across the load; a first capacitor connected across said output terminals; an inductor having a first terminal connected to one output terminal and having a second terminal; only two transistors one of the two transistors being a switching transistor having an emitter electrode connected to one input terminal, having a collector electrode connected to said second terminal of said inductor, and having a base electrode, said first transistor being alternately conducting and nonconducting for selectively switching current from the power source to said inductor and first capacitor; the other of the two transistors being a single control transistor having an emitter electrode connected to the other input and other output terminals, having a collector electrode connected to said switching transistor base electrode, and having a base electrode; a first semiconductor diode connected between said second terminal of said inductor and the other output terminal for commutating current from said inductor when said switching transistor is nonconducting; a second diode which is a zener diode connected between said one output terminal and said control transistor emitter electrode for sensing variations in voltage across said output port; a third diode which is a zener diode connected between said control transistor base electrode and said other input terminal for establishing a reference voltage therebetween; and a second capacitor regeneratively coupling said switching transistor collector electrode to said control transistor base electrode; said control transistor comparing variations in the output voltage across said first capacitor that are sensed by said second diode and the reference voltage set by said third diode for turning said switching transistor on and off according to variations in the output voltage.
Claim 2
Dependent Claim
334 words
A DC to DC converter that is a two-port network for converting a direct current input voltage from an electrical power source into a regulated direct current output voltage of lower magnitude across a load, comprising an input port having a pair of input terminals for connection across the power source; an output port having a pair of output terminals for connection across the load; a first capacitor connected across said output terminals; an inductor having a first terminal connected to one output terminal and having a second terminal; only two transistors one of the two transistors being a switching transistor having an emitter electrode connected to one input terminal, having a collector electrode connected to said second terminal of said inductor, and having a base electrode, said first transistor being alternately conducting and nonconducting for selectively switching current from the power source to said inductor and first capacitor; the other of the two transistors being a single control transistor having an emitter electrode connected to the other input and other output terminals, having a collector electrode connected to said switching transistor base electrode, and having a base electrode; a first semiconductor diode connected between said second terminal of said inductor and the other output terminal for commutating current from said inductor when said switching transistor is nonconducting; a second diode which is a zener diode connected between said one output terminal and said control transistor emitter electrode for sensing variations in voltage across said output port; a third diode which is a zener diode connected between said control transistor base electrode and said other input terminal for establishing a reference voltage therebetween; and a second capacitor regeneratively coupling said switching transistor collector electrode to said control transistor base electrode; said control transistor comparing variations in the output voltage across said first capacitor that are sensed by said second diode and the reference voltage set by said third diode for turning said switching transistor on and off according to variations in the output voltage.
Claim 3
Dependent Claim
27 words
The converter according to claim 1 including a third capacitor connected in parallel with said second diode for integrating variations in the voltage across said output port.
Claim 4
Dependent Claim
33 words
The converter according to claim 2 including a first start-up resistor connected between said switching transistor emitter electrode and said control transistor base electrode and a second resistor connected across said second capacitor.
Claim 5
Dependent Claim
27 words
The converter according to claim 3 including fourth and fifth semiconductor diodes connected across said switching transistor emitter-base junction and emitter-collector junction, respectively, for protecting these junctions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |