US3819986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excess voltage protecting circuit
Assignee: Sony Corp
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Filing: 1973-04-10
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Granted: 1974-06-25
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Expires: 1993-04-10
Abstract
Abstract An excess voltage protecting circuit for use with an automatic voltage regulating circuit of the type which has a circuit breaker, fuse or the like connected in series between the automatic voltage regulating circuit and the power supply to be regulated, the excess voltage protecting circuit including means for detecting the output voltage from the voltage regulating circuit for producing a first control signal for the voltage regulating circuit and a second control signal, and a shunt circuit responsive to the second control signal which operates to trip the current breaking device when the voltage output from the voltage regulating circuit exceeds a predetermined level.
Inventors
- 👤 T Fukuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:44
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/041; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/569; G05F1/571; Y; Y10; Y10S; Y10S323/00; Y10S323/901
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
225 words
An excess voltage protecting circuit comprising: A. an input terminal; B. an output terminal; C. a common terminal; D. excess current breaking means connected to said input terminal; E. voltage regulating means responsive to a control signal and connected to said input terminal; F. control signal generating means for producing said control signal and including a first transistor of one conductivity type having first, second and third electrodes; G. a reference voltage source; H. output voltage detecting means connected between said output terminal and said common terminal I. a switching element having a control electrode, said switching element being connected between said common terminal and a junction point of said excess current breaking means and said voltage regulating means; J. means for connecting said first, second and third electrodes, respectively, of said first transistor to said voltage regulating means, said output voltage detecting means, and said reference voltage source; and K. a second transistor of the opposite conductivity type from said first transistor and having a collector electrode connected to said control electrode of said switching element, a base electrode connected to said reference voltage source, and an emitter-electrode connected to said output voltage detecting means, said second transistor being biased to make said switching element conductive when the voltage derived from said output voltage detecting means exceeds said reference voltage by a predetermined amount.
Claim 2
Dependent Claim
225 words
An excess voltage protecting circuit comprising: A. an input terminal; B. an output terminal; C. a common terminal; D. excess current breaking means connected to said input terminal; E. voltage regulating means responsive to a control signal and connected to said input terminal; F. control signal generating means for producing said control signal and including a first transistor of one conductivity type having first, second and third electrodes; G. a reference voltage source; H. output voltage detecting means connected between said output terminal and said common terminal I. a switching element having a control electrode, said switching element being connected between said common terminal and a junction point of said excess current breaking means and said voltage regulating means; J. means for connecting said first, second and third electrodes, respectively, of said first transistor to said voltage regulating means, said output voltage detecting means, and said reference voltage source; and K. a second transistor of the opposite conductivity type from said first transistor and having a collector electrode connected to said control electrode of said switching element, a base electrode connected to said reference voltage source, and an emitter-electrode connected to said output voltage detecting means, said second transistor being biased to make said switching element conductive when the voltage derived from said output voltage detecting means exceeds said reference voltage by a predetermined amount.
Claim 3
Dependent Claim
53 words
An improved voltage regulating circuit for a power supply as recited in claim 1 wherein, the voltage regulating means comprises a switching regulation circuit of the series type and a pulse width modulating circuit connected to the first electrode of the first transistor for controlling the duty cycle of the switching regulation circuit.
Claim 4
Dependent Claim
10 words
a second electrode connected to said voltage reference source, and
Claim 5
Dependent Claim
10 words
a second electrode connected to said voltage reference source, and
Claim 6
Dependent Claim
10 words
a second electrode connected to said voltage detecting means, and
Claim 7
Dependent Claim
10 words
a second electrode connected to said voltage detecting means, and
Claim 8
Dependent Claim
51 words
a transformer comprising a winding connected in series with Said current carrying electrodes to comprise a series circuit connected across said output terminals; E. oscillatory means to supply actuating pulse signals to said semiconductor device to render such semiconductor device periodically non-conductive; F. a control transistor of one conductivity type comprising:
Claim 9
Dependent Claim
51 words
a transformer comprising a winding connected in series with Said current carrying electrodes to comprise a series circuit connected across said output terminals; E. oscillatory means to supply actuating pulse signals to said semiconductor device to render such semiconductor device periodically non-conductive; F. a control transistor of one conductivity type comprising:
Claim 10
Dependent Claim
79 words
a third electrode; C. pulse generating means connected to said second control transistor, and to said connecting means, whereby the duty cycle of pulses generated by said pulse generating means is controlled by said second control transistor and the timing of said pulses is controlled by said oscillatory means; and D. means connecting the output of said pulse generating means to said regulating transistor to control the conductivity thereof in accordance with said pulses from said pulse generating means.
Claim 11
Dependent Claim
79 words
a third electrode; C. pulse generating means connected to said second control transistor, and to said connecting means, whereby the duty cycle of pulses generated by said pulse generating means is controlled by said second control transistor and the timing of said pulses is controlled by said oscillatory means; and D. means connecting the output of said pulse generating means to said regulating transistor to control the conductivity thereof in accordance with said pulses from said pulse generating means.
Claim 12
Dependent Claim
76 words
a third electrode; G. connecting means connecting said oscillatory circuit to said deflection circuit; and H. means connecting said control transistor to said connecting means to interrupt the transmission of signals from said oscillatory circuit to said deflection circuit when the voltage at the output of said voltage detecting means exceeds a predetermined magnitude, whereby said semiconductor device remains conductive and actuates said excess current breaking means to interrupt current to said excess voltage control circuit.
Claim 13
Dependent Claim
76 words
a third electrode; G. connecting means connecting said oscillatory circuit to said deflection circuit; and H. means connecting said control transistor to said connecting means to interrupt the transmission of signals from said oscillatory circuit to said deflection circuit when the voltage at the output of said voltage detecting means exceeds a predetermined magnitude, whereby said semiconductor device remains conductive and actuates said excess current breaking means to interrupt current to said excess voltage control circuit.
Claim 14
Dependent Claim
31 words
An improved voltage regulating circuit for a power supply as recited in claim 1 wherein the switching element is a four-layer semiconductor device having at least anode, cathode and gate electrodes.
Claim 15
Dependent Claim
76 words
An improved excess voltage control circuit connected between a pair of input terminals and a pair of output terminals, an external load being connected to said output terminals, wherein the improvement comprises: A. excess current breaking means connected in series between a first one of said input terminals and a first one of said output terminals; B. a voltage reference source; C. output voltage detecting means connected across said output terminals; D. a deflection circuit comprising:
Claim 16
Dependent Claim
76 words
An improved excess voltage control circuit connected between a pair of input terminals and a pair of output terminals, an external load being connected to said output terminals, wherein the improvement comprises: A. excess current breaking means connected in series between a first one of said input terminals and a first one of said output terminals; B. a voltage reference source; C. output voltage detecting means connected across said output terminals; D. a deflection circuit comprising:
Claim 17
Dependent Claim
52 words
An improved excess voltage control circuit as defined by claim 4 comprising, in addition: A. a regulating transistor having an emitter-collector circuit connected in series between said current breaking means and said first output terminal; B. a second control transistor of the opposite conductivity type from said first-named control transistor and comprising:
Claim 18
Dependent Claim
115 words
An improved excess voltage control circuit according to claim 5 comprising, in addition: A. a second winding on said transformer; B. a rectifying circuit connected to said second winding to produce a direct voltage; C. direct current circuit means connecting said rectifying means to said oscillatory circuit and to said pulse generating means to supply operating voltage thereto; and D. a capacitor connecting a circuit point between said regulating transistor and the one of said input terminals to which it is connected to said direct current circuit means to supply an initial impulse signal to said direct current circuit means to initiate operation of said oscillatory means, said pulse generating means, and said regulating transistor.
Claim 19
Dependent Claim
56 words
An improved voltage regulating circuit for a power supply as recited in claim 4, wherein said means connecting said control transistor to said connecting means comprises a further transistor having first, second and third electrodes connected, respectively, to the oscillatory circuit, the third electrode of the control transistor and the other one of said output terminals.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |