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Automatic polarity and condition sensing battery charger
| Details |
Inventors: Whiting, John S.; Dickey, Chris C.;
Assignee: Century Mfg. Co. (Minneapolis, MN)
Primary Examiner: Wong; Peter S.
Assistant Examiner: Toatley, Jr.; Gregory J.
Attorney, Agent or Firm:
The present invention discloses a battery charging device adapted to be connected to a battery having a positive and a negative terminal for supplying a direct current to the positive terminal of the battery. This device comprises an alternating current supply means, such as a transformer, connected to a power supply for providing alternating current, such as a wall socket. A charge current supply controller means is connected to the secondary winding of the transformer. The charge current supply controller means comprises two pairs of silicon controlled rectifiers ("SCR") and a SCR interface circuit. The secondary of the transformer is also connected to the SCRs. A processor which is connected to the SCR interface circuit determines which pair of SCRs will supply direct current to the battery. The processor, which is connected to the output of the polarity sensing detector, decides which pair of SCRs will be the conduit for the current to the battery based on the output of the polarity sensing detector. The polarity sensing detector is in communication with the battery. The SCRs are adapted to be connected to the positive and negative terminals of the battery for supplying direct current to the positive terminal of the battery. Once the polarity of the connection has been determined and the direct current will flow to the positive terminal of the battery, the processor utilizes software to determine whether a battery can accept charge. |
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DETAILED DESCRIPTION The present invention discloses a battery charging device adapted to be connected to a battery having a positive and a negative terminal for supplying a direct current to the positive terminal of the battery.
This device comprises an alternating current supply, such as a transformer, connected to an external power supply for providing alternating current, such as a wall socket.
A charge current supply controller is connected to the secondary winding of the transformer.
The charge current supply controller comprises two pairs of silicon controlled rectifiers ("SCR") and a SCR interface circuit.
The secondary of the transformer is also connected to the SCRs.
A processor which is connected to the SCR interface circuit determines which pair of SCRs will supply direct current to the battery.
The processor, which is connected to the output of the polarity sensing detector, decides which pair of SCRs will be the conduit for the current to the battery based on the output of the polarity sensing detector.
The polarity sensing detector is in communication with the battery.
The SCRs are adapted to be connected to the positive and negative terminals of the battery for supplying direct current to the positive terminal of the battery.
The polarity sensing detector can determine the configuration of the polarity at the attachment cables as long as the voltage of the battery is greater than zero.
Once the polarity of the connection has been determined and the direct current is flowing to the positive terminal of the battery, the processor utilizes software to determine whether a battery can accept charge.
In particular, while the battery is being charged or if the current is being supplied for engine start, the processor monitors the voltage of the battery for a period of time, performs certain calculations, and compares the results to values in a look-up table.
Based on the comparisons, the charger will shut down, if the results of the comparisons indicate that the battery is not accepting charge
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