US4458186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor control device for power transistor chopper
Assignee: Hitachi Ltd
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Filing: 1982-12-14
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Granted: 1984-07-03
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Expires: 2002-12-14
Abstract
Abstract A transistor control device in a power transistor chopper is arranged to charge a capacitor for feeding a base current to the chopper transistor with electrical energy stored in an impedance of a wiring connecting a DC power source to a load to which the load current is supplied from the DC power source through the chopper.
Inventors
- 👤 Shigeru Kuriyama
- 👤 Minoru Kaminaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:35
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/92
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A control device for a transistor chopper which controls a load current fed from a DC power source to a load by periodically turning on and off a transistor connected between the DC power source and the load, comprising: capacitor means for storing electric energy to be used for supplying a base current to control the conduction of said transistor; means for charging said capacitor means with electrical energy stored in impedance means of the wiring connecting said DC power source to said load when said transistor is OFF; means connected between said capacitor means and said base of said transistor for controlling the base current suppled from said capacitor means to said transistor; and means for charging said capacitor means by said power source when the ON-duty of said transistor exceeds a predetermined value.
Claim 2
Dependent Claim
135 words
A control device for a transistor chopper which controls a load current fed from a DC power source to a load by periodically turning on and off a transistor connected between the DC power source and the load, comprising: capacitor means for storing electric energy to be used for supplying a base current to control the conduction of said transistor; means for charging said capacitor means with electrical energy stored in impedance means of the wiring connecting said DC power source to said load when said transistor is OFF; means connected between said capacitor means and said base of said transistor for controlling the base current suppled from said capacitor means to said transistor; and means for charging said capacitor means by said power source when the ON-duty of said transistor exceeds a predetermined value.
Claim 3
Dependent Claim
137 words
A control device for a transistor chopper which controls a load current fed from a DC power source to a load by periodically turning on and off a transistor connected between the DC power source and the load, comprising: capacitor means for storing electric energy to be used for supplying a base current to control the conduction of said transistor; means for charging said capacitor means with electrical energy stored in impedance means of the wiring connecting said DC power source to said load when said transistor is OFF: means connected between said capacitor means and said base of said transistor for controlling the base current supplied from said capacitor means to said transistor; and means for charging said capacitor means by said power source when the base potential of said transistor is below a predetermined value.
Claim 4
Dependent Claim
137 words
A control device for a transistor chopper which controls a load current fed from a DC power source to a load by periodically turning on and off a transistor connected between the DC power source and the load, comprising: capacitor means for storing electric energy to be used for supplying a base current to control the conduction of said transistor; means for charging said capacitor means with electrical energy stored in impedance means of the wiring connecting said DC power source to said load when said transistor is OFF: means connected between said capacitor means and said base of said transistor for controlling the base current supplied from said capacitor means to said transistor; and means for charging said capacitor means by said power source when the base potential of said transistor is below a predetermined value.
Claim 5
Dependent Claim
139 words
A control device for a transistor chopper which controls a load current fed from a DC power source to a load by periodically turning on and off a transistor connected between the DC power source and the load, comprising: capacitor means for storing electric energy to be used for supplying a base current to control the conduction of said transistor; means for charging said capacitor means with electrical energy stored in impedance means of the wiring connecting said DC power source to said load when said transistor is OFF; means connected between said capacitor means and said base of said transistor for controlling the base current supplied from said capacitor means to said transistor; and means for increasing the base current supplied from said capacitor means to said transistor with increase of said load current exceeding a predetermined level.
Claim 6
Dependent Claim
139 words
A control device for a transistor chopper which controls a load current fed from a DC power source to a load by periodically turning on and off a transistor connected between the DC power source and the load, comprising: capacitor means for storing electric energy to be used for supplying a base current to control the conduction of said transistor; means for charging said capacitor means with electrical energy stored in impedance means of the wiring connecting said DC power source to said load when said transistor is OFF; means connected between said capacitor means and said base of said transistor for controlling the base current supplied from said capacitor means to said transistor; and means for increasing the base current supplied from said capacitor means to said transistor with increase of said load current exceeding a predetermined level.
Claim 7
Dependent Claim
28 words
A control device according to claim 3, wherein said charging means includes a diode connected between the collector of said transistor and one end of said capacitor means.
Claim 8
Dependent Claim
46 words
A control device according to claim 3, wherein said charging means includes a switching circuit connected between the collector of said transistor and one end of said capacitor means, said switching circuit being rendered conductive when the collector current of said transistor exceeds a predetermined value.
Claim 9
Dependent Claim
19 words
A control device according to claim 3, wherein said load is a DC motor for driving a battery car.
Claim 10
Dependent Claim
153 words
A control device for a transistor chopper which controls a load current fed from a DC power aource to a load by periodically turning on and off a transistor connected between the DC power source and the load, comprising: capacitor means for storing electric energy to be used for supplying a base current to control the conduction of said transistor; means for charging said capacitor means with electrical energy stored in impedance means of the wiring connecting said DC power source to said load when said transistor is OFF, said charging means including a switching circuit connected between the collector of said transistor and one end of said capacitor means, said switching circuit being rendered conductive when the collector current of said transistor exceeds a predetermined value; and means connected between said capacitor means and said base of said transistor for controlling the base current supplied from said capacitor means to said transistor.
Claim 11
Dependent Claim
153 words
A control device for a transistor chopper which controls a load current fed from a DC power aource to a load by periodically turning on and off a transistor connected between the DC power source and the load, comprising: capacitor means for storing electric energy to be used for supplying a base current to control the conduction of said transistor; means for charging said capacitor means with electrical energy stored in impedance means of the wiring connecting said DC power source to said load when said transistor is OFF, said charging means including a switching circuit connected between the collector of said transistor and one end of said capacitor means, said switching circuit being rendered conductive when the collector current of said transistor exceeds a predetermined value; and means connected between said capacitor means and said base of said transistor for controlling the base current supplied from said capacitor means to said transistor.
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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |