Regulated battery charger
This patent describes a circuit for regulating the average current through and the voltage applied across the first and second terminals of a load. It comprises: a transformer secondary having two end terminals and a center tap, the center tap being connected to the first terminal of the load; a pair of individually and selectively operable switching elements. Each of the switching elements being connected between the second terminal of the load and a respective one of the end terminals of the transformer of the transformer secondary. Each of the switching elements during the duty cycle thereof completing a closed current path in which current flows through the load in a signal common current flow direction; a sense element comprising a resistance of less than 1 ohm connected in series with the load for producing a sensed voltage proportional to the current through the load; a current control loop connected to the sense element and the switching device. The current control loop adapted for controlling the duty cycle of the switching elements to maintain a constant average current through the load; means for establishing a preselected threshold voltage; and a voltage control loop having a comparator circuit for comparing the voltage present at the terminals of the load and a preselected threshold voltage.
- Assignee:
- Fisher Scientific Group Inc., San Diego, CA
- Patent Number(s):
- A; US 4897591
- Application Number:
- PPN: US 7047413A
- OSTI ID:
- 7012869
- Country of Publication:
- United States
- Language:
- English
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