US3789288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Converter for producing a stabilized output direct-current voltage from an input direct-current voltage
Assignee: Individual
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Filing: 1971-10-19
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Granted: 1974-01-29
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Expires: 1991-10-19
Abstract
Abstract The present disclosure relates to a converter for producing a stabilized output D.C. voltage from an input D.C. voltage. The stabilization of the output voltage is carried out by means of pulse width regulation of a rectangular wave voltage obtained from the chopped input voltage. The level of the output voltage is sensed by means of a sensing device and compared with a reference voltage, whereby an error signal is obtained. A blocking oscillator device is on one hand triggering a driving stage which controls the chopping of the input voltage, and is on the other hand delivering a saw tooth voltage in order to add the same to the error signal. The sum of said signals is fed to a pulse width control device for controlling said pulse width regulation.
Inventors
- 👤 B Assow
- 👤 C Jansson
- 👤 K Rolleberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:12
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M3/3387; H02M3/3388; H02M3/337; H02M3/3376; H02M3/3378
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
309 words
A converter for producing a stabilized output DC voltage from an input DC voltage comprising at least two switching means for switching the input DC voltage to a rectangular wave form voltage, a first transformer having a primary winding with a center tap and a secondary winding, said primary winding being connected to said switching means, a full wave rectifier, a smoothing filter means for connecting said secondary winding said full wave rectifier and said smoothing filter to provide an output circuit for the converter, a second transformer having a primary winding and at least one secondary winding, a driving stage comprising a multivibrator circuit connected to one input of the converter and to the center tap of the primary winding of said first transformer, said driving stage being adapted to activate said switching means across the primary winding of said second transformer alternatingly and periodically, sensing amplifier means for sensing the output voltage of the converter and for comparing this voltage with a constant reference voltage, said sensing amplifier means generating an error signal if the output voltage differs from the reference voltage, a blocking oscillator means for generating on the one hand oscillator pulses which are supplied to said driving stage as trigger pulses, and on the other hand generating a saw tooth voltage, the decrease of which being produced at the beginning of each of said oscillator pulses, a third transformer having a primary winding connected to said blocking oscillator means and a secondary winding connected to said driver stage, a pulse width control means receiving the saw tooth voltage whEn added to said error signal for inhibiting the pulses from said driving stage during a time interval when the saw tooth voltage is below a predetermined threshold value whereby the pulse width of said rectangular waveform generated by each of said switching means is varied.
Claim 2
Dependent Claim
309 words
A converter for producing a stabilized output DC voltage from an input DC voltage comprising at least two switching means for switching the input DC voltage to a rectangular wave form voltage, a first transformer having a primary winding with a center tap and a secondary winding, said primary winding being connected to said switching means, a full wave rectifier, a smoothing filter means for connecting said secondary winding said full wave rectifier and said smoothing filter to provide an output circuit for the converter, a second transformer having a primary winding and at least one secondary winding, a driving stage comprising a multivibrator circuit connected to one input of the converter and to the center tap of the primary winding of said first transformer, said driving stage being adapted to activate said switching means across the primary winding of said second transformer alternatingly and periodically, sensing amplifier means for sensing the output voltage of the converter and for comparing this voltage with a constant reference voltage, said sensing amplifier means generating an error signal if the output voltage differs from the reference voltage, a blocking oscillator means for generating on the one hand oscillator pulses which are supplied to said driving stage as trigger pulses, and on the other hand generating a saw tooth voltage, the decrease of which being produced at the beginning of each of said oscillator pulses, a third transformer having a primary winding connected to said blocking oscillator means and a secondary winding connected to said driver stage, a pulse width control means receiving the saw tooth voltage whEn added to said error signal for inhibiting the pulses from said driving stage during a time interval when the saw tooth voltage is below a predetermined threshold value whereby the pulse width of said rectangular waveform generated by each of said switching means is varied.
Claim 3
Dependent Claim
61 words
A converter according to claim 1 wherein the pulse width control device includes an amplifier stage the output of which is connected to a full-wave rectifier which in dependence on the value of the saw tooth voltage is adapted to short-circuit a further winding of said second transformer whereby the control pulses from said driving stage to the switches are inhibited.
Claim 4
Dependent Claim
38 words
A converter according to claim 2, wherein the trigger pulses delivered from the blocking oscillator means to the driving stage have a frequency which is twice the frequency of those pulses which are generated by the switching means.
Claim 5
Dependent Claim
51 words
A converter according to claim 1 wherein said trigger pulses to the driving stage consist of the inverse pulses which arise in said third transformer upon the presence of said oscillator pulses whereby a certain time delay between the beginning of the saw tooth voltage and a trigger pulse is obtained.
Claim 6
Dependent Claim
13 words
A converter according to claim 1 wherein said switching means comprise power transistors.
Claim 7
Dependent Claim
51 words
A converter according to claim 1 wherein said multivibrator comprises two transistors having collectors to the resistor means for connecting each of said collectors to the primary winding of said second transformer, and said second transformer has first and second secondary windings for respectively controlling different ones of said switching means.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |