Lee E Leppo

US Patent:

6362597, Mar 26, 2002

Filed:

Jan 3, 2001

Appl. No.:

09/753523

Inventors:

Lee Edward Leppo - The Woodlands TX
Martin M. Weiss - The Woodlands TX
Prashant A. Solanki - Houston TX

Assignee:

Telxon Corporation - Holtsville NY

International Classification:

H01M 1046

US Classification:

320116, 320119

Abstract:

A power distribution system is provided for distributing power in a portable device being coupable to a charging system and including a main battery power and a bridge battery power. The charging system is coupled to a power bus through a diode. The main battery power system and the bridge battery system are also both coupled to the power bus through diodes. The predetermined voltage level is set with respect to the charging system, the main battery and the bridge battery, such that if all three are coupled to the bus, the recharging system both powers the unit and recharges the main battery. If the recharging system is removed, the main battery power system powers the portable device, and if the main battery power system is removed the bridge battery will provide power to the portable device. The distribution system also includes a monitoring system for measuring the predetermined charge level on the battery and disabling a FET switch, so that the main battery stops charging to protect the main battery against overcharging. A monitoring system is also provided for monitoring the voltage level of the main battery utilizing a comparator system.

US Patent:

57809917, Jul 14, 1998

Filed:

Jul 31, 1996

Appl. No.:

8/690554

Inventors:

Clifford Brake - Wadsworth OH
Lee Leppo - Tallmadge OH

Assignee:

Telxon Corporation - Akron OH

International Classification:

H01M 1046
H01M 1044

US Classification:

320 6

Abstract:

A charging apparatus with multiple charge stations is disclosed. The apparatus includes a single power supply which operates under the control of a microprocessor to charge a plurality of battery packs disposed in respective charging stations. Associated with each charging station is a wiring harness assembly which includes an EEPROM memory chip having one or more stored charging algorithms for the type or types of battery packs to be charged at that charging station. The microprocessor reads the charging algorithm from a charging station's memory chip when a battery pack is inserted in the charging station. The microprocessor utilizes a feedback control loop including a resistor network to regulate the charging current and charging voltage supplied to each battery pack being charged. If a plurality of Li-Ion battery packs are disposed in respective charging stations, each pack is sequentially charged such that the voltage across the pack is raised to the rated output voltage of the pack. Then, all of the Li-Ion battery packs are charged in parallel until each is fully charged.

US Patent:

52007260, Apr 6, 1993

Filed:

Aug 26, 1991

Appl. No.:

7/749867

Inventors:

Lee E. Leppo - Tallmadge OH
James A. Campo - Brunswick OH

Assignee:

Telxon Corporation - Akron OH

International Classification:

H01H 900

US Classification:

335207

Abstract:

An electric switch assembly for use with a magnetic reed switch includes a trigger that is movable with respect to a housing between an open position and a closed position and that includes a trigger magnet. The switch assembly further includes a second magnet, fixed relative to the housing, that is located adjacent the first magnet when the trigger is in the open position. The magnets are oriented such that their magnetic fields tend to cancel each other when the trigger is in its open position. This provides an increased disparity in the magnetic field reaching the magnetic reed switch between the open position and closed position and eliminates the need for precision alignment and individual adjustment of the magnetic reed switch at the point of manufacture.

US Patent:

60466847, Apr 4, 2000

Filed:

May 23, 1997

Appl. No.:

8/862562

Inventors:

Richard A. Hamersley - Wooster OH
Mark F. Pleso - Sharon PA
Lee E. Leppo - Tallmadge OH

Assignee:

Telxon Corporation - Akron OH

International Classification:

G08C 1900

US Classification:

34082569

Abstract:

A single button contrast control which can bi-directionally adjust a contrast function in one of two directions so as to increase or decrease the contrast of a display. An interrupt generator generates an interrupt for each user activation of a single button control key. A control circuit incrementally adjusts the contrast function in accordance with the interrupts generated. If no interrupts are generated within a predetermined period of time following a previous interrupt, the control circuit changes the direction in which the contrast is incrementally adjusted so that the next time a user activates the single button control key the control will be adjusted in the other direction.

US Patent:

53651600, Nov 15, 1994

Filed:

Sep 6, 1991

Appl. No.:

7/755890

Inventors:

Lee E. Leppo - Tallmadge OH
Charles A. Rinkes - Medina OH

Assignee:

Telxon Corporation - Akron OH

International Classification:

H02J 700

US Classification:

320 22

Abstract:

A charging system monitors the rate of change in battery voltage, adjusts the rate of charging, and checks the changes in battery voltage following adjustments in the rate of charging to observe a predetermined sequence of voltage changes that signifies when a battery is fully charged. The charging system determines the slope between consecutive battery voltage measurements. The charging system charges a battery at the full battery capacity in response to positive or zero voltage slope measurements and reduces the charging rate in response to negative voltage slope measurements. A nickel-cadmium battery is fully charged when at least one sequence of a negative slope, followed by a decrease in charging rate, then a positive or flat slope, followed by an increase in charge rate, and finally another negative slope is observed.

US Patent:

58353666, Nov 10, 1998

Filed:

Jun 24, 1997

Appl. No.:

8/881773

Inventors:

Mark F. Pleso - Sharon PA
Lee E. Leppo - Tallmadge OH

Assignee:

Telxon Corporation - Akron OH

International Classification:

H02M 318

US Classification:

363 59

Abstract:

A secondary battery boost system which includes a primary power supply for a computing device, and a secondary power supply for the computing device. The boost system also includes a boost circuit operative to increase the power output of the secondary power supply applied to the computing device. Upon the output of the primary power supply falling below a level suitable for properly powering the computing device, the boost circuit feeds the computing device power from the secondary power supply. The boost circuit also boosts the power output of the secondary power supply so that the secondary power supply can be smaller and more light weight.

US Patent:

61724785, Jan 9, 2001

Filed:

Feb 23, 2000

Appl. No.:

9/510829

Inventors:

Lee Edward Leppo - The Woodlands TX
Martin M. Weiss - The Woodlands TX
Prashant A. Solanki - Houston TX

Assignee:

Telxon Corporation - Akron OH

International Classification:

H01M 1044
H01M 1046

US Classification:

320116

Abstract:

A power distribution system is provided for distributing power in a portable device being coupable to a charging system and including a main battery power and a bridge battery power. The charging system is coupled to a power bus through a diode. The main battery power system and the bridge battery system are also both coupled to the power bus through diodes. The predetermined voltage level is set with respect to the charging system, the main battery and the bridge battery, such that if all three are coupled to the bus, the recharging system both powers the unit and recharges the main battery. If the recharging system is removed, the main battery power system powers the portable device, and if the main battery power system is removed the bridge battery will provide power to the portable device. The distribution system also includes a monitoring system for measuring the predetermined charge level on the battery and disabling a FET switch, so that the main battery stops charging to protect the main battery against overcharging. A monitoring system is also provided for monitoring the voltage level of the main battery utilizing a comparator system.

US Patent:

57449392, Apr 28, 1998

Filed:

Sep 5, 1996

Appl. No.:

8/708468

Inventors:

Lee E. Leppo - Tallmadge OH

Assignee:

Telxon Corp. - Akron OH

International Classification:

H01M 1046

US Classification:

320153

Abstract:

A monitoring circuit for a Li-Ion battery pack charging apparatus is disclosed. The monitoring circuit modifies charging time for a Li-Ion battery pack inserted in the charging apparatus to compensate for temperature effects on the charging current input to the battery pack. In one embodiment of the monitoring circuit, a comparator is utilized to compare a voltage across the battery pack, V. sub. charge, to a set point voltage value, V. sub. sp. The set point voltage value, V. sub. sp, is taken off a temperature sensor circuit comprising a voltage divider circuit. The voltage divider circuit includes at least one thermistor in a ground connected leg of the divider. In a second embodiment of the monitoring circuit of the present invention, a differential amplifier is coupled to opposite ends of a low resistance sensor resistor. The sensor resistor is coupled between charging circuitry and the Li-Ion battery pack to be charged. The voltage differential across the resistor, V. sub.