US4823023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor with differentiated control switching circuit
Assignee: Nippon Chemi Con Corp
•
Filing: 1986-07-15
•
Granted: 1989-04-18
•
Expires: 2006-07-15
Abstract
Abstract A switching circuit is improved in efficiency by including a switching corrector circuit for feeding back reversed polarity, differentiated switching pulses to the base of the switching transistor. In addition, temperature stability is achieved by providing a constant current source for a drive transistor which drives the switching transistor and for a control transistor which controls the drive transistor on the basis of the detected output of the circuit.
Inventors
- 👤 Tetsuhiko Shimpo
- 👤 Isao Fujihata
- 👤 Atsushi Yanase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:27
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: 14
Claim 1
Independent Claim
108 words
A switching circuit, comprising, a switching transistor adapted to open or close responsive to an input pulse, a switching corrector circuit for receiving pulses from the switching transistor and reversing the polarity thereof, said switching corrector circuit differentiating said reversed pulses and providing the base of said switching transistor with said differentiated pulse superimposed on said input pulse, said switching corrector circuit comprising a choke transformer connected to said switching transistor, and a capacitor for providing the base of said switching transistor with differentiated pulses of reversed polarity from said choke transformer, whereby said input pulse has sharply inclined waveform to improve the efficiency of said switching circuit.
Claim 2
Dependent Claim
108 words
A switching circuit, comprising, a switching transistor adapted to open or close responsive to an input pulse, a switching corrector circuit for receiving pulses from the switching transistor and reversing the polarity thereof, said switching corrector circuit differentiating said reversed pulses and providing the base of said switching transistor with said differentiated pulse superimposed on said input pulse, said switching corrector circuit comprising a choke transformer connected to said switching transistor, and a capacitor for providing the base of said switching transistor with differentiated pulses of reversed polarity from said choke transformer, whereby said input pulse has sharply inclined waveform to improve the efficiency of said switching circuit.
Claim 3
Dependent Claim
109 words
A switching circuit, comprising; a switching transistor for converting a d.c. input to an a.c. voltage, means for converting said a.c. voltage to a d.c. output voltage, a drive transistor for causing said switching transistor to perform a switching operation, a control transistor for detecting a variation in a level of the d.c. output voltage and for controlling a switching operation of said drive transistor according to the detected variation, constant current supply means for providing a constant operating current for said control transistor and said drive transistor, and a switching corrector circuit for feeding differentiated, reversed polarity switching transistor output pulses to a base of said switching transistor.
Claim 4
Dependent Claim
109 words
A switching circuit, comprising; a switching transistor for converting a d.c. input to an a.c. voltage, means for converting said a.c. voltage to a d.c. output voltage, a drive transistor for causing said switching transistor to perform a switching operation, a control transistor for detecting a variation in a level of the d.c. output voltage and for controlling a switching operation of said drive transistor according to the detected variation, constant current supply means for providing a constant operating current for said control transistor and said drive transistor, and a switching corrector circuit for feeding differentiated, reversed polarity switching transistor output pulses to a base of said switching transistor.
Claim 5
Dependent Claim
49 words
A switching circuit according to claim 2, wherein said constant current supply means comprises a constant-voltage circuit between an input terminal and an output terminal on the higher potential side of said switching circuit, said constant-voltage circuit supplying a constant current to said drive transistor and said control transistor.
Claim 6
Dependent Claim
52 words
A switching circuit according to claim 2, wherein said constant-current supply means includes a constant-voltage circuit between an input terminal and an output terminal on the higher potential side of said switching circuit and a constant-current circuit that produces a constant current in response to a bias input to said constant-voltage circuit.
Claim 7
Dependent Claim
30 words
A switching circuit according to claim 2, and further including a switching corrector circuit for feeding differentiated, reversed polarity switching transistor output pulses to the base of said switching transistor.
Claim 8
Dependent Claim
42 words
A switching circuit according to claim 5, wherein said switching corrector circuit comprises a choke transformer connected to said switching transistor, and a capacitor for providing the base of said switching transistor with differentiated pulses of reversed polarity from said choke transformer.
Claim 9
Dependent Claim
58 words
A switching circuit according to claim 2, wherein said constant-current supply means comprises a diode and a resistor connected across said converting means, and a transistor coupled at its base to the junction between said diode and resistor, at its emitter to the d.c. input through a resistor, and at its collector to said drive and control transistors.
Claim 10
Dependent Claim
42 words
A switching circuit according to claim 2, wherein said switching corrector circuit comprises a choke transformer connected to said switching transistor, and a capacitor for providing the base of said switching transistor with differentiated pulses of reversed polarity from said choke transformer.
Claim 11
Dependent Claim
129 words
A switching circuit, comprising; input terminals for receiving a d.c. input; a switching transistor for converting said d.c. input to an a.c. voltage, means for converting said a.c. voltage to a d.c. output voltage, a drive transistor for causing the switching transistor to perform a switching operation, a control transistor for detecting a variation in a level of the d.c. output voltage by comparison with a reference voltage and for controlling a switching operation of said drive transistor according to the detected variation, a constant-voltage circuit connected between the input terminals receiving said d.c. input and which provides a constant operating current for said drive and control transistors and, a switching corrector circuit for feeding differentiated, reversed polarity switching transistor output pulses to a base of said switching transistor.
Claim 12
Dependent Claim
129 words
A switching circuit, comprising; input terminals for receiving a d.c. input; a switching transistor for converting said d.c. input to an a.c. voltage, means for converting said a.c. voltage to a d.c. output voltage, a drive transistor for causing the switching transistor to perform a switching operation, a control transistor for detecting a variation in a level of the d.c. output voltage by comparison with a reference voltage and for controlling a switching operation of said drive transistor according to the detected variation, a constant-voltage circuit connected between the input terminals receiving said d.c. input and which provides a constant operating current for said drive and control transistors and, a switching corrector circuit for feeding differentiated, reversed polarity switching transistor output pulses to a base of said switching transistor.
Claim 13
Dependent Claim
46 words
A switching circuit according to claim 9, wherein said constant-voltage circuit comprises a resistor connected in series with a constant-voltage diode for supplying a constant current to said drive and control transistors from the junction therebetween upon application of an input voltage to said constant-voltage circuit.
Claim 14
Dependent Claim
42 words
A switching circuit according to claim 9, wherein said switching corrector circuit comprises a choke transformer connected to said switching transistor, and a capacitor for providing the base of said switching transistor with differentiated pulses of reversed polarity from said choke transformer.
References Cited (Backward Citations)
US3323034A
Cited
US3470391A
Cited
US3629622A
Cited
US3657572A
Cited
US3686516A
Cited
US3787738A
Cited
US4017789A
Cited
US4464585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |