US3590361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dc to dc converter including switching device having its on and off times independently controlled by the line and load voltages, respectively
Assignee: AT&T Inc
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Filing: 1969-12-31
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Granted: 1971-06-29
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Expires: 1989-12-31
Abstract
Abstract The duty cycle of the switching transistor in a DC to DC converter is controlled by an astable multivibrator whose alternate switching states are respectively responsive to the line and load voltages. Feedback of the output voltage to control the duration of one state of the multivibrator is obtained from the primary of the converter output transformer whose magnetic energy level is not allowed to fully dissipate in any one operating cycle. A balancing circuit arrangement is utilized to minimize variations in the base drive signal of the switching transistor and to prevent it from saturating to eliminate variations in the duration of the conducting state of the transistor due to charge storage.
Inventors
- 👤 John D Bishop
- 👤 Paul Mischenko
- 👤 Roman Ostapiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:23
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507; H02M1/00; H02M1/0003; H02M1/0032; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A switching-type voltage regulator comprising a direct current power source, an output circuit, a switching device to effect the transfer of energy from said source to said output circuit, timing means to control the switching of said switching device, energy storage means to store energy from said source when said switching device is transmitting and means to deliver energy from said energy storage means to said output circuit when said switching device is not transmitting, said energy storage means having a storage capacity sufficient to avoid a complete discharge of the stored energy during the time interval when the switching device is not transmitting, voltage detection means to monitor the voltage of said energy storage means, means to utilize the input voltage from said source to control the duration during which said switching device is transmitting and means responsive to said voltage detection means to control the duration during which said switching device is not transmitting.
Claim 2
Dependent Claim
156 words
A switching-type voltage regulator comprising a direct current power source, an output circuit, a switching device to effect the transfer of energy from said source to said output circuit, timing means to control the switching of said switching device, energy storage means to store energy from said source when said switching device is transmitting and means to deliver energy from said energy storage means to said output circuit when said switching device is not transmitting, said energy storage means having a storage capacity sufficient to avoid a complete discharge of the stored energy during the time interval when the switching device is not transmitting, voltage detection means to monitor the voltage of said energy storage means, means to utilize the input voltage from said source to control the duration during which said switching device is transmitting and means responsive to said voltage detection means to control the duration during which said switching device is not transmitting.
Claim 3
Dependent Claim
85 words
A voltage regulator as defined in claim 1 including a pulse transformer coupling said timing device to said switching device, wherein said switching device comprises a transistor and further including means to prevent said transistor from saturating and a voltage storage capacitor to act as a stabilizing voltage source coupling said pulse transformer to said means to prevent, whereby said stabilizing voltage minimizes variations in the bias signal transmitted by said transformer which are due to variations in the conducting time of said switching transistor.
Claim 4
Dependent Claim
66 words
A voltage regulator as defined in claim 1 wherein said means to utilize the input voltage comprises a signal path interconnecting said source of energy to said timing means and said means responsive to said voltage detection means comprises a current source coupled to said timing means whose current output is responsive to a function of the output voltage as detected by said voltage detection means.
Claim 5
Dependent Claim
90 words
A voltage regulator as defined in claim 3 wherein said means to deliver energy comprises an output transformer and said energy storage means comprises the magnetic core of said output transformer, and said current source comprises a current transistor whose collector-emitter path couples said energy source to said timing means, and a bias resistor in the base circuit of said current transistor coupled to the primary of said output transformer through a diode poled to conduct only when energy is being transferred from said energy storage means to said load.
Claim 6
Dependent Claim
163 words
A DC to DC converter circuit comprising a source of energy, energy storage meaNs, a load to be energized, a switching transistor coupling said source of energy and said energy storage means, energy transfer means to transfer energy from said energy storage means to said load to be energized, a free-running multivibrator to control the switching of said switching transistor by generating forward bias signals and reverse bias signals, first means to control the charging of one of the timing capacitors of said multivibrator in response to the voltage of said source of energy, second means to control the charging of the other timing capacitor of said multivibrator in response to the voltage of said energy transfer means, means to limit the forward bias signals applied to said switching transistor to prevent it from conducting in its saturated state, and means for equalizing the integral of the forward bias signal with the integral of the reverse bias signal applied to said switching transistor.
Claim 7
Dependent Claim
163 words
A DC to DC converter circuit comprising a source of energy, energy storage meaNs, a load to be energized, a switching transistor coupling said source of energy and said energy storage means, energy transfer means to transfer energy from said energy storage means to said load to be energized, a free-running multivibrator to control the switching of said switching transistor by generating forward bias signals and reverse bias signals, first means to control the charging of one of the timing capacitors of said multivibrator in response to the voltage of said source of energy, second means to control the charging of the other timing capacitor of said multivibrator in response to the voltage of said energy transfer means, means to limit the forward bias signals applied to said switching transistor to prevent it from conducting in its saturated state, and means for equalizing the integral of the forward bias signal with the integral of the reverse bias signal applied to said switching transistor.
Claim 8
Dependent Claim
59 words
The inverter circuit as claimed in claim 5 further including a pulse transformer wherein said multivibrator is coupled to said switching transistor by said pulse transformer and said means for equalizing comprises a capacitor interconnecting said pulse transformer and said switching transistor to supply a stabilizing voltage to minimize variations in the bias signals transmitted by said pulse transformer.
Claim 9
Dependent Claim
71 words
The inverter circuit as claimed in claim 5 wherein said first means to control the charging of one of the timing capacitors includes a signal path interconnecting said source of energy to the timing capacitor and said second means to control the charging of the other timing capacitor comprises a current source whose current output is responsive to a function of the output voltage as detected through said energy transfer means.
Claim 10
Dependent Claim
75 words
The inverter circuit as claimed in claim 7 wherein said energy transfer means comprises a transformer and said current source comprises a current transistor whose collector-emitter path couples said energy source to said other timing capacitor, and a bias resistor in the base circuit of said current transistor coupled to the primary of said transformer through a diode poled to conduct only when energy is being transferred from said energy storage means to said load.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |