Method and apparatus for a cardiac defibrillator high voltage charging circuit
First Claim
1. A cardiac defibrillator charging circuit for charging an energy storage capacitor from multiple power supplies comprising:
- a battery having an energy output,a DC voltage supply having an energy output,a high voltage storage and discharge capacitor,a transformer having a first primary winding, a second primary winding, and a secondary winding, the secondary winding coupled across the capacitor; and
switching circuitry for intermittently connecting the battery to the first primary winding and for intermittently connecting the DC voltage supply to the second primary winding creating alternating fields across the first and second primary windings.
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Accused Products
Abstract
A variable rate defibrillator charging circuit includes a power transformer that accepts an internal battery output and the output from an AC-to-DC converter on separate primary windings. The secondary winding of the transformer is coupled through a rectifier to a storage capacitor. The transformer operates in a fly-back mode whereby energy is discharged into the storage capacitor when the power supplies discontinue charging the transformer. After energy in the transformer is discharged into the storage capacitor, the power supplies are reactivated, recharging the transformer. The separate primary windings of the transformer provide a fast, reliable, low cost means for charging the storage capacitor with multiple power supplies. The AC power source feeding the AC-to-DC converter is detachable allowing the defibrillator to be operated remotely whereby the storage capacitor is charged solely from the internal battery. The charging circuit monitors the output voltage levels of both the battery and the AC-to-DC converter and enables or disables the power supplies in accordance to their ability to charge the storage capacitor within a predetermined amount of time. The energy in the storage capacitor, which is eventually discharged into a patient, is monitored to prevent overcharging.
84 Citations
20 Claims
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1. A cardiac defibrillator charging circuit for charging an energy storage capacitor from multiple power supplies comprising:
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a battery having an energy output, a DC voltage supply having an energy output, a high voltage storage and discharge capacitor, a transformer having a first primary winding, a second primary winding, and a secondary winding, the secondary winding coupled across the capacitor; and switching circuitry for intermittently connecting the battery to the first primary winding and for intermittently connecting the DC voltage supply to the second primary winding creating alternating fields across the first and second primary windings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A quick charging cardiac defibrillator comprising:
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a battery, a DC voltage supply, a high voltage storage and discharge capacitor, a transformer having first and second primary windings and a secondary winding, switching means for intermittently connecting the battery and DC voltage supply to the first and second primary windings of the transformer respectively creating alternating fields across the first and second primary windings; and means for coupling the secondary winding of the transformer to the high voltage storage and discharge capacitor. - View Dependent Claims (10, 11, 12, 13)
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14. A method for charging a high voltage storage and discharge capacitor in a cardiac defibrillator, the method comprising:
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providing a first DC power supply and a second DC power supply each having given output characteristics; providing a transformer having first and second primary windings with given input characteristics and a secondary winding; coupling the secondary winding across the high voltage storage and discharge capacitor, intermittently coupling and decoupling the first DC power supply and the second DC power supply respectively to the first and second primary windings of the transformer, transforming the energy from at least one of the first and second power supplies into a single high voltage output; and discharging the transformed energy into the high voltage storage and discharge capacitor. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification