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US 2003/0078620 A1Published application
Average current mode controlled energy storage in a defibrillator
AssigneeMedtronic Physio-Control Corp.
InventorBarry F. Waltman
Life of this patent
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Abstract
Techniques are described for charging an energy storage device, such as the high-voltage energy storage capacitors of an external defibrillation device, using an average current mode control technique. By controlling the average current in a transformer, energy may be stored rapidly and at controlled energy levels.
Claims32
A method for charging an energy storage device associated with a defibrillator, the method comprising:
- applying current to a primary coil in a flyback transformer;
- sensing an average current through the flyback transformer;
- controlling the applied current to cause the average current to follow a reference current;
- and
- transferring energy from the flyback transformer to the energy storage device.
2 more elements
A device for charging an energy storage device associated with a defibrillator, the device comprising:
- an energy source;
- and
- a charging circuit that transfers energy from the energy source to an energy storage device, the charging circuit including a flyback transformer, wherein the charging circuit transfers energy to the energy storage device as a function of the average current in the flyback transformer.
A medical device comprising:
- a transformer;
- an energy source that supplies energy to a primary coil of the transformer;
- a switch that regulates the supply of energy to the primary coil;
- an energy storage device that receives energy from a secondary coil of the flyback transformer;
- and
- a controller that controls the switch as a function of the average current in the transformer.
3 more elements
A medical device comprising:
- a difference circuit that generates an error signal as a function of the difference between a reference current and an average current in a transformer that transfers energy to an energy storage device;
- a modulator that modulates the duty cycle of a control signal as a function of the error signal;
- and
- a switch that regulates the supply of energy to a primary coil of the transformer according to the control signal.
1 more element
Dependencies are inferred from the claim text.