Patent US3947746A successfully refreshed from Google Patents.
US3947746A
Expired / Lapsed
US
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Single-ended dc-to-dc converter for the pulse control of the voltage at an inductive load as well as method for its operation
Assignee: Siemens AG
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Filing: 1974-12-30
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Granted: 1976-03-30
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Expires: 1994-12-30
Abstract
Abstract A single-ended dc-to-dc converter which comprises a transformer having a primary winding which is connected to a d-c voltage source via a switch, a secondary winding which is connected to a load via a series valve and a choke, and a remagnetizing winding. In order to obtain an output voltage from the converter which is higher or lower, as desired, than the d-c supply voltage, provision is made for a first controlled by-pass valve to be shunted across the series connection of the secondary winding and the series valve and for a second controlled by-pass valve, poled in the direction of the load current, to be connected in parallel with the series connection of the choke and the load.
Inventors
- 👤 Harald Heinicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H02M3/137
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
167 words
A single-ended dc-to-dc converter for use with a d-c voltage source and for providing pulse control of the voltage at an inductive load comprising: a transformer including primary, secondary and magnetization reversal windings; switch means for connecting said primary winding to said voltage source; a first circuit means for connecting said secondary winding to said load, said first circuit means including a series valve connected to a choke; limiting resistor means for connecting said magnetization winding to said voltage source such that the magnetization reversal current which flows through said magnetization reversal winding magnetizes the magnetic core of said transformer in the opposite direction as the primary current in said primary winding; a first controlled by-pass valve connected in shunt with a first series circuit comprising said series valve and said secondary winding; and a second by-pass valve connected in shunt with a second series circuit comprising said choke and said load, said second by-pass valve being poled in the direction of the current in said load.
Claim 2
Dependent Claim
167 words
A single-ended dc-to-dc converter for use with a d-c voltage source and for providing pulse control of the voltage at an inductive load comprising: a transformer including primary, secondary and magnetization reversal windings; switch means for connecting said primary winding to said voltage source; a first circuit means for connecting said secondary winding to said load, said first circuit means including a series valve connected to a choke; limiting resistor means for connecting said magnetization winding to said voltage source such that the magnetization reversal current which flows through said magnetization reversal winding magnetizes the magnetic core of said transformer in the opposite direction as the primary current in said primary winding; a first controlled by-pass valve connected in shunt with a first series circuit comprising said series valve and said secondary winding; and a second by-pass valve connected in shunt with a second series circuit comprising said choke and said load, said second by-pass valve being poled in the direction of the current in said load.
Claim 3
Dependent Claim
15 words
A converter in accordance with claim 1 in which said second by-pass valve is controlled.
Claim 4
Dependent Claim
17 words
A converter in accordance with claim 2 in which said first and second by-pass valves are thyristors.
Claim 5
Dependent Claim
107 words
A converter in accordance with claim 3 in which: one end of said series valve and one end of said choke are connected to form a common junction; the other end of said choke is connected to one end of said load; the other end of said series valve is connected to one end of said secondary winding; the cathode and anode of said first by-pass valve are connected, respectively, to said common junction and to the other end of said secondary winding; and the cathode and anode of said second by-pass valve are connected, respectively, to said common junction and the other end of said load.
Claim 6
Dependent Claim
58 words
A converter in accordance with claim 2 which further includes: a first control unit including a comparator for firing said second by-pass valve, said control unit providing a firing pulse when a first voltage indicative of the negative voltage at said second winding exceeds a limit voltage which is above the d-c supply voltage of said voltage source.
Claim 7
Dependent Claim
76 words
A converter in accordance with claim 5 in which: said transformer has a turns ratio substantially equal to 1:1; said switch means includes a controlled main valve and a quenching arrangement, said quenching arrangement comprising a quenching capacitor and being connected in shunt with said main valve; said first voltage comprises the voltage across said quenching capacitor; and said converter further includes means for applying said voltage across said quenching capacitor to said first control unit.
Claim 8
Dependent Claim
31 words
A converter in accordance with claim 6 which further includes: means for developing said limit voltage which permits adjustment thereof; and means for applying said limit voltage to said control unit.
Claim 9
Dependent Claim
45 words
A converter in accordance with claim 5 in which: the d-c output voltage provided at said load has a value below that of said d-c supply voltage; said converter further includes a second control unit for providing firing pulses to said first controlled by-pass valve.
Claim 10
Dependent Claim
29 words
Apparatus in accordance with claim 8 in which said second control unit comprises a timing device which is responsive to the firing pulses generated by said first control unit.
Claim 11
Dependent Claim
32 words
A converter in accordance with claim 8 in which said second control unit fires a pulse at a point in time when said second by-pass valve is fired and takes over current.
Claim 12
Dependent Claim
44 words
A converter in accordance with claim 8 in which said second control unit fires a pulse at a point in time which is a predetermined time interval after the point in time at which said second by-pass valve is fired and takes over current.
Claim 13
Dependent Claim
19 words
A converter in accordance with claim 11 in which said predetermined internval can be set by a timing signal.
Claim 14
Dependent Claim
58 words
A converter in accordance with claim 12 which further includes: a third control unit for controlling said switch means; and a control means for generating first and second output voltages, said first output voltage comprising said setting signal and being applied to said second control unit and said second output voltage being applied to said third control unit.
Claim 15
Dependent Claim
38 words
A converter in accordance with claim 13 in which said control means includes: a controller circuit for developing a control signal; and a distribution circuit responsive to said control signal for developing said first and second output voltages.
Claim 16
Dependent Claim
42 words
A converter in accordance with claim 14 in which said distribution circuit causes said first output voltage to be zero until said control signal reaches a predetermined threshold value and, thereafter, causes said first output to increase proportionally to said control signal.
Claim 17
Dependent Claim
95 words
A converter in accordance with claim 1 which further includes: a battery; a second circuit means for connecting said battery to said secondary winding, said second circuit means comprising a second series valve connected to a second choke; a third controlled by-pass valve connected in shunt with a third series circuit including said secondary winding and said second series valve; and a forth by-pass valve connected in parallel with a fourth series circuit including said second choke and said battery, said fourth by-pass valve being poled in the direction of the current charging said battery.
Claim 18
Dependent Claim
15 words
A converter in accordance with claim 16 in which said fourth by-pass valve is controlled.
Claim 19
Dependent Claim
17 words
A converter in accordance with claim 17 in which each of said by-pass valves is a thyristor.
Claim 20
Dependent Claim
15 words
A converter in accordance with claim 16 in which said second series valve is controlled.
Claim 21
Independent Claim
230 words
A method of operating a single-ended dc-to-dc converter; said converter being of a type which is used with a d-c voltage source, provides pulse control of the voltage at an inductive load, and comprises: a transformer including primary, secondary and magnetization reversal windings; switch means for connecting said primary winding in said voltage source; a first circuit means for connecting said secondary winding to said load, said first circuit means including a series valve connected to a choke; limiting resistor means for connecting said magnetization winding to said voltage source such that the magnetization reversal current which flows through said magnetization reversal winding magnetizes the magnetic core of said transformer in the opposite direction as the primary current in said primary winding; a first controlled by-pass valve connected in shunt with a first series circuit comprising said series valve and said secondary winding; and a second controlled by-pass valve connected in shunt with a second series circuit comprising said choke and said load, said second by-pass valve being poled in the direction of the current in said load; said method comprising the step of firing said first and second by-pass valves together at a point in time in each of a number of time periods when the absolute amount of negative voltage at said secondary winding exceeds a predetermined limit, said limit being above the supply voltage of said source.
Claim 22
Independent Claim
230 words
A method of operating a single-ended dc-to-dc converter; said converter being of a type which is used with a d-c voltage source, provides pulse control of the voltage at an inductive load, and comprises: a transformer including primary, secondary and magnetization reversal windings; switch means for connecting said primary winding in said voltage source; a first circuit means for connecting said secondary winding to said load, said first circuit means including a series valve connected to a choke; limiting resistor means for connecting said magnetization winding to said voltage source such that the magnetization reversal current which flows through said magnetization reversal winding magnetizes the magnetic core of said transformer in the opposite direction as the primary current in said primary winding; a first controlled by-pass valve connected in shunt with a first series circuit comprising said series valve and said secondary winding; and a second controlled by-pass valve connected in shunt with a second series circuit comprising said choke and said load, said second by-pass valve being poled in the direction of the current in said load; said method comprising the step of firing said first and second by-pass valves together at a point in time in each of a number of time periods when the absolute amount of negative voltage at said secondary winding exceeds a predetermined limit, said limit being above the supply voltage of said source.
Claim 23
Dependent Claim
46 words
A method in accordance with claim 20 in which: said step of firing is such that firing occurs at the same relative point in time in each of said periods; and said method further includes the step of varying the "on" ratio of said switch means.
Claim 24
Independent Claim
265 words
A method of operating a single-ended dc-to-dc converter; said converter being of a type which is used with a d-c voltage source, provides pulse control of the voltage at an inductive load, and comprises: a transformer including primary, secondary and magnetization reversal windings; switch means for connecting said primary winding to said voltage source; a first circuit means for connecting said secondary winding to said load, said first circuit means including a series valve connected to a choke; limiting resistor means for connecting said magnetization winding to said voltage source such that the magnetization reversal current which flows through said magnetization reversal winding magnetizes the magnetic core of said transformer in the opposite direction as the primary current in said primary winding; a first controlled by-pass connected in shunt with a first series circuit comprising said series valve and said secondary winding; and a second controlled by-pass valve connected in shunt with a second series circuit comprising said choke and said load, said second by-pass valve being poled in the direction of the current in said load; said method comprising the steps of: firing said second by-pass valve at a point in time in each of a number of time periods when the absolute amount of negative voltage at said secondary winding exceeds a predetermined limit, said limit being above the supply voltage of said source; and firing said first by-pass valve at a point in time in each of said periods which is after said point in time at which said second by-pass valve is fired in such period by a predetermined time interval.
Claim 25
Independent Claim
265 words
A method of operating a single-ended dc-to-dc converter; said converter being of a type which is used with a d-c voltage source, provides pulse control of the voltage at an inductive load, and comprises: a transformer including primary, secondary and magnetization reversal windings; switch means for connecting said primary winding to said voltage source; a first circuit means for connecting said secondary winding to said load, said first circuit means including a series valve connected to a choke; limiting resistor means for connecting said magnetization winding to said voltage source such that the magnetization reversal current which flows through said magnetization reversal winding magnetizes the magnetic core of said transformer in the opposite direction as the primary current in said primary winding; a first controlled by-pass connected in shunt with a first series circuit comprising said series valve and said secondary winding; and a second controlled by-pass valve connected in shunt with a second series circuit comprising said choke and said load, said second by-pass valve being poled in the direction of the current in said load; said method comprising the steps of: firing said second by-pass valve at a point in time in each of a number of time periods when the absolute amount of negative voltage at said secondary winding exceeds a predetermined limit, said limit being above the supply voltage of said source; and firing said first by-pass valve at a point in time in each of said periods which is after said point in time at which said second by-pass valve is fired in such period by a predetermined time interval.
Claim 26
Dependent Claim
68 words
A method in accordance with claim 22 in which: the step of firing said second by-pass valve is such that firing occurs at the same relative point in time in each of said intervals; the step of firing said first by-pass valve is such that said predetermined time interval is varied; and said method further includes the step of holding the "on" ratio of said switch means constant.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |