Single-ended dc-to-dc converter for the pulse control of the voltage at an inductive load as well as method for its operation
AssigneeSiemens Aktiengesellschaft
InventorHarald Heinicke
Life of this patent
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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.
Claims23
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.
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.
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.
Dependencies are inferred from the claim text.