Pulse-charge battery charger

A pulse-charge battery charger to automatically charge batteries and especially to charge nickel-cadmium batteries to keep them free from any unwanted memory effects, and all the user must do is to place a battery in this charger and remove it per his or her convenience, and the status of the charging is known at any time by observing indicating lights, comprising:

• a. a housing having a battery receiving volume, electrical contacts, and an additional volume to receive other components;
• b. circuitry, inclusive of several circuits, electric and electronic components, arranged on a circuit board and installed in the housing;
• these several circuits and their electric and electronic components, in turn comprising:
• i. a power supply circuit to receive either AC or DC low voltage power and to distribute both an unregulated voltage of full wave rectified low voltage DC power, and a regulated low voltage DC power;
• ii. a U1 controller having self contained control circuits inclusive of a reset circuit;
• iii. a battery installed detector circuit, detecting a battery voltage, connected to the regulated low voltage DC power of the power supply and to the U1 controller;
• iv. a normalize circuit connected to a battery being charged and to the U1 controller to accommodate the charging of batteries having different numbers of cells;
• v. a constant current source circuit connected to the unregulated DC low voltage of the power supply, the U1 controller, and a battery being charged, to insure the same constant amperage of the charging power;
• vi. a discharge control circuit connected to the U1 controller, the normalize circuit, the battery installed detector circuit, and a battery being charged;
• vii. a thermistor sensor circuit connected to a thermistor, the regulated low voltage DC power, and a battery overheat detection circuit to detect whether or not a battery being charged has a built in thermistor, and if so this circuit sends a signal of any possible overheating directly from a built in thermistor in the battery to a battery overheat detection circuit;
• however, if a battery has no built in thermistor, then this circuit sends a signal of any possible overheating directly from a thermistor in the charger to a battery overheat detection circuit;
• viii. the thermistor, positioned directly in this charger, to monitor temperatures of a battery;
• ix. the battery overheat detection circuit connected to the thermistor sensor circuit, and to the regulated low voltage DC power;
• x. a timing control circuit connected to the U1 controller, the regulated low voltage DC power, and a ready light circuit;
• xi. the ready light circuit connected to the U1 controller, the timing control circuit, the regulated low voltage DC power, and a no battery then no light circuit;
• xii. the no battery then no light circuit connected to the ready light circuit, the battery installed detector circuit, and the regulated low voltage DC power;
• and
• xiii. a reset circuit connected to the battery installed detector circuit, the U1 controller, and the regulated low voltage DC power.

A pulse-charge battery charger to automatically charge batteries and especially to charge nickel-cadmium batteries to keep them free from any unwanted memory effects, and all the user must do is to place a battery in this charger and remove it per his or her convenience, and the status of the charging is known at any time by observing indicating lights, comprising:

• a. a housing having a battery receiving volume, electrical contacts, and an additional volume to receive other components;
• b. circuitry, inclusive of several circuits, electric and electronic components, arranged on a circuit board and installed in the housing;
• these several circuits and their electric and electronic components, in turn comprising:
• i. a power supply circuit to receive either AC or DC low voltage power and to distribute both an unregulated voltage of full wave rectified low voltage DC power, and a regulated low voltage DC power;
• ii. a U1 controller having self contained control circuits inclusive of a reset circuit;
• iii. a battery installed detector circuit, detecting a battery voltage, connected to the regulated low voltage DC power of the power supply and to the U1 controller;
• iv. a normalize circuit connected to a battery being charged and to the U1 controller, to accommodate the charging of batteries having different numbers of cells;
• v. a constant current source circuit connected to the unregulated DC low voltage of the power supply, the U1 controller, and the battery being charged, to insure the same constant amperage of the charging power;
• vi. a discharge control circuit connected to the U1 controller, the normalize circuit, the battery installed detector circuit, and the battery being charged;
• vii. a thermistor sensor circuit connected to a thermistor, the regulated low voltage DC power, and a battery overheat detection circuit;
• viii. the thermistor, positioned directly in this charger, to monitor temperatures of a battery;
• ix. a battery overheat detection circuit connected to the thermistor sensor circuit, and to the regulated low voltage DC power, and this circuit includes both a negative temperature coefficient temperature circuit portion, which has a U2A unit, and a positive temperature coefficient temperature sensor detection circuit portion, which has a U2B unit, and the U2A unit and the U2B unit are operational amplifiers, used as respective comparitors, which compare two voltage signals without doing anything to the balance of this circuitry, while determining which voltage signal is greater;
• x. a timing control circuit connected to the U1 controller, the regulated low voltage DC power, and a ready light circuit;
• xi. the ready light circuit connected to the U1 controller, the timing control circuit, the regulated low voltage DC power, and a no battery then no light circuit;
• xii. the no battery then no light circuit connected to the ready light circuit, the battery installed detector circuit, and the regulated low voltage DC power;
• and
• xiii. a reset circuit connected to the battery installed detector circuit, the U1 controller, and the regulated low voltage DC power.

A pulse-charge battery charger to automatically charge batteries and especially to charge nickel-cadmium batteries to keep them free from any unwanted memory effects, and all the user must do is to place a battery in this charger and remove it per his or her convenience, and the status of the charging is known at any time by observing indicating lights, comprising:

• a. a housing having a battery receiving volume, electrical contacts, and an additional volume to receive other components;
• b. circuitry, inclusive of several circuits, electric and electronic components, arranged on a circuit board and installed in the housing;
• these several circuits and their electric and electronic components, in turn comprising:
• i. a power supply circuit to receive either AC or DC low voltage power and to distribute both an unregulated voltage of full wave rectified low voltage DC power, and a regulated low voltage DC power;
• ii. a U1 controller having self contained control circuits inclusive of a reset circuit;
• iii. a battery installed detector circuit, detecting a battery voltage, connected to the regulated low voltage DC power of the power supply and to the U1 controller;
• iv. a normalize circuit connected to a battery being charged and to the U1 controller to accommodate the charging of batteries having different numbers of cells;
• v. a constant current source circuit connected to the unregulated DC low voltage of the power supply, the U1 controller, and the battery being charged, to insure the same constant amperage of the charging power;
• vi. a discharge control circuit connected to the U1 controller, the normalize circuit, the battery installed detector circuit, and the battery being charged;
• vii. a thermistor sensor circuit connected to a thermistor, the regulated low voltage DC power, and a battery overheat detection circuit;
• viii. the thermistor, positioned directly in this charger, to monitor temperatures of a battery;
• ix. the battery overheat detection circuit connected to the thermistor sensor circuit, and to the regulated low voltage DC power;
• x. a timing control circuit connected to the U1 controller, the regulated low voltage DC power, and a ready light circuit;
• xi. the ready light circuit connected to the U1 controller, the timing control circuit, the regulated low voltage DC power, and a no battery then no light circuit, and this ready light circuit has both a green light and a driver circuit thereof, and when necessary, this driver circuit is isolated by using capacitor C2, a CR5 diode, and resistors R7 and R8;
• xii. the no battery then no light circuit connected to the ready light circuit, the battery installed detector circuit, and the regulated low voltage DC power;
• and
• xiii. a reset circuit connected to the battery installed detector circuit, the U1 controller, and the regulated low voltage DC power.