US3629622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching regulator having a low dissipation current overload detection device
Assignee: GTE Sylvania Inc
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Filing: 1970-04-03
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Granted: 1971-12-21
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Expires: 1990-04-03
Abstract
Abstract A switching regulator employs between a primary power source and a switching transistor a sensing circuit which senses the current being drawn through the switching transistor by a load. A storage filter circuit having a large series inductance is connected between the load and the switching transistor. A feedback network is connected between the output connection of the storage filter circuit and the switching transistor to activate the switching transistor when the output voltage falls below a predetermined value and to inactivate the switching transistor when the output voltage exceeds a predetermined reference value. The sensing means which senses gradual overloads and a timing circuit which senses abrupt overloads are coupled to the switching transistor via a threshold circuit which compares the output signals from the sensing means and the timing circuits to a predetermined threshold level. When either of the output signals exceeds the threshold level, the switching transistor is opened interrupting the current from the primary power source.
Inventors
- 👤 David Denenberg Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:00
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
505 words
A switching regulator comprising: a direct current energy source; an output terminal; storage filter means coupled in series with said direct current energy source and said output terminal and being operative to store and supply current to a load connected to said output terminal; switching means coupled between said direct current energy source and said storage filter means and having a control connection and being operative in response to a first signal at said control connection to provide a low-impedance path between said direct current energy source and said storage filter means and being operative in response to a second signal at said control connection to provide a high impedance between said direct current energy source and said storage filter means to thereby interrupt the flow of current from said direct current energy source and said storage filter means; feedback means having an input connection connected to said output terminal and an output connection connected to the control connection of said switching means and being operative to generate said first signal at the control connection of said switching means when the voltage at said output terminal decreases below a predetermined value and to generate said second signal when the voltage at said output terminal increases above said predetermined value; sensing means coupled in series with said direct current energy source and said output terminal and having a voltage output terminal, said sensing means being operative to generate at its voltage output terminal a signal, the magnitude of which is proportional to the current passing between said direct current energy source and the output terminal of said switching regulator; threshold means having an input connection connected to the voltage output terminal of said sensing means and an output connection coupled to the control connection of said switching means and being operative to generate said second predetermined signal at said control connection when the magnitude of the signal at the voltage output terminal of said sensing means exceeds a predetermined threshold level; and timing means coupled between said switching means and said threshold means and being operative to generate a signal voltage proportional to the length of time said switching means is closed, said threshold means including a field effect transistor, the gate of which is connected to said sensing means and said timing means and the source and drain of which are coupled, respectively, to a supply voltage and a source of reference potential to thereby set a predetermined threshold level at said gate, said field effect transistor being operative in response to a predetermined signal at said gate to generate an output signal, and a monostable circuit having an input connection coupled to said field effect transistor and an output connection coupled to the control connection of said switching means and being operative in response to the output signal from said field effect transistor to generate said second signal at said control connection of said switching means to thereby open said switching transistor device when the predetermined threshold of said field effect transistor is exceeded.
Claim 2
Dependent Claim
505 words
A switching regulator comprising: a direct current energy source; an output terminal; storage filter means coupled in series with said direct current energy source and said output terminal and being operative to store and supply current to a load connected to said output terminal; switching means coupled between said direct current energy source and said storage filter means and having a control connection and being operative in response to a first signal at said control connection to provide a low-impedance path between said direct current energy source and said storage filter means and being operative in response to a second signal at said control connection to provide a high impedance between said direct current energy source and said storage filter means to thereby interrupt the flow of current from said direct current energy source and said storage filter means; feedback means having an input connection connected to said output terminal and an output connection connected to the control connection of said switching means and being operative to generate said first signal at the control connection of said switching means when the voltage at said output terminal decreases below a predetermined value and to generate said second signal when the voltage at said output terminal increases above said predetermined value; sensing means coupled in series with said direct current energy source and said output terminal and having a voltage output terminal, said sensing means being operative to generate at its voltage output terminal a signal, the magnitude of which is proportional to the current passing between said direct current energy source and the output terminal of said switching regulator; threshold means having an input connection connected to the voltage output terminal of said sensing means and an output connection coupled to the control connection of said switching means and being operative to generate said second predetermined signal at said control connection when the magnitude of the signal at the voltage output terminal of said sensing means exceeds a predetermined threshold level; and timing means coupled between said switching means and said threshold means and being operative to generate a signal voltage proportional to the length of time said switching means is closed, said threshold means including a field effect transistor, the gate of which is connected to said sensing means and said timing means and the source and drain of which are coupled, respectively, to a supply voltage and a source of reference potential to thereby set a predetermined threshold level at said gate, said field effect transistor being operative in response to a predetermined signal at said gate to generate an output signal, and a monostable circuit having an input connection coupled to said field effect transistor and an output connection coupled to the control connection of said switching means and being operative in response to the output signal from said field effect transistor to generate said second signal at said control connection of said switching means to thereby open said switching transistor device when the predetermined threshold of said field effect transistor is exceeded.
Claim 3
Dependent Claim
222 words
A switching regulator according to claim 1 wherein said timing means comprises: a pair of series-connected resistors having one end connected to said driver transistor and the other end connected to a source of reference potential; a first and second resistor each having one end connected to a source of voltage; a first transistor having its base connected to the common juncture of said pair of Series-connected resistors, its collector connected to the other end of said first resistor and its emitter connected to a source of reference potential and being operative to conduct when a predetermined voltage is present at the common juncture of said pair of series connected resistors; a second transistor having its base connected to the collector of said first transistor, its collector connected to the other end of said second resistor and its emitter connected to the source of reference potential, and being operative to conduct when said first transistor is nonconducting and to be nonconducting when said first transistor is conducting; and a capacitor having one end connected to the collector of said second transistor and to said threshold means and the other end connected to a source of reference potential, said capacitor being operative to charge toward a predetermined level when said second transistor is nonconducting and to discharge when said second transistor is conducting.
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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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |