Protection circuit for a battery charger
First Claim
1. An improved protection circuit for a battery charger, for safely charging a battery from a remote power supply, which comprises:
- (a) a power control means responsive to input from the remote power supply, and to a positive polarity from the battery to be charged;
(b) and overload sensing means responsive to the power control means, and to a negative polarity from the battery to be charged;
(c) a main switching means responsive to the overload sensing means, to the power control means, and to the negative polarity of the battery to be charged to controllably limit the current output of the battery charger in the presence of a slight overload condition, and to deactuate the battery charger in the presence of a large overload condition.
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Accused Products
Abstract
A protection circuit for a battery charger for safely charging a battery from a remote electrical power supply is disclosed. The protection circuit includes a power control means responsive to input from the remote power supply; an overload sensing means responsive to the power control means and to the negative polarity of the battery; a main switching means responsive to the overload sensing means and to the power control means wherein the main switching means controllably limits current output in the presence of a slight overload condition, and deactuates the battery charger in the presence of a large overload condition. An indicating means, such as a light emitting diode is preferably disposed between the power control means and the main switching means, to signal when the battery is being properly charged, and is deactuated when a short circuit occurs across the positive and negative terminals of the battery, or when the polarity is reversed at the battery terminals, or when the battery charger deactuates due to an overload condition.
15 Citations
20 Claims
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1. An improved protection circuit for a battery charger, for safely charging a battery from a remote power supply, which comprises:
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(a) a power control means responsive to input from the remote power supply, and to a positive polarity from the battery to be charged; (b) and overload sensing means responsive to the power control means, and to a negative polarity from the battery to be charged; (c) a main switching means responsive to the overload sensing means, to the power control means, and to the negative polarity of the battery to be charged to controllably limit the current output of the battery charger in the presence of a slight overload condition, and to deactuate the battery charger in the presence of a large overload condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An improved protection circuit for a battery charger, for safely charging a battery from a remote power supply, which comprises:
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(a) a power control means responsive to input from the remote power supply, and to a positive polarity from the battery to be charged; (b) and overload sensing means responsive to the power control means, and to a negative polarity from the battery to be charged; (c) a main switching means responsive to the overload sensing means, the power control means, and to the negative polarity of the battery to be charged to controllably limit the current output of the battery charger in the presence of a slight overload condition, and to deactuate the battery charger in the presence of a large overload condition; and (d) an indicating means in electrical communication with the power control means and the main switching means, wherein the indicating means is responsive to a proper connection between the battery charger and the battery. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An improved protection circuit for a battery charger, for safely charging a battery from a remote power supply, which comprises:
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(a) a power control means responsive to input from the remote power supply, and to a positive polarity from the battery to be charged; (b) an overload sensing means responsive to the power control means, and to a negative polarity from the battery to be charged; (c) a main switching means responsive to the overload sensing means, the power control means, and to the negative polarity of the battery to be charged;
the main switching means further comprising at least one resistor whose value is decreased to increase circuit sensitivity to adjust current overload to limit current output in the presence of a slight overload condition, and a first and second transistor with emitters electrically joined, the first and second transistors disposed within the circuit to deactuate the circuit in the presence of a large overload condition; and(d) an indicator means in electrical communication with the power control means and the main switching means, wherein the indicating means is responsive to a proper connection between the battery charger and the battery. - View Dependent Claims (20)
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Specification