Battery charger
First Claim
1. A battery charger including a rectifier connected to a source of alternating voltage for generating a rectified sinusoidal halfwave voltage, the charger comprising;
- first gate-triggered switching means having an anode connected to a negative pole of a rechargeable battery and a cathode connected to a negative terminal of said rectifier for applying said sinusoidal halfwave voltage to the battery;
trigger means connected between the negative pole of said battery and the gate of said first switching means for triggering the same into conduction to apply said voltage to said battery when the instantaneous value of the sinusoidal voltage is higher than the voltage of said battery;
temperature responsive switching means for disconnecting said trigger means from said battery when said battery is heated to a temperature higher than a predetermined value, indicative of fully charged battery; and
second gate-triggered switching means responsive to said temperature responsive switching means establishing a short-circuit path across the cathode and the gate of said first switching means to prevent further charging of the battery after it has been fully charged, notwithstanding a subsequent cooling of the battery below the predetermined value.
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Accused Products
Abstract
A battery charger comprises a rectifier connected to a source of alternating voltage for generating a rectified sinusoidal halfwave voltage and a thyristor connected in a first circuit between the rectifier and a rechargeable battery for applying the sinusoidal halfwave voltage thereto. An RC triggering network is provided in a second circuit between the battery and the gate of the thyristor for triggering the same into conduction to apply the sinusoidal voltage to the battery when the instantaneous value of the voltage is higher than the voltage of the battery. A temperature responsive switch is provided for disconnecting the second circuit when the battery is heated to a temperature higher than a predetermined value. Further provided is a transistor responsive to the temperature responsive switch for establishing a short-circuit path to the gate of the thyristor.
35 Citations
11 Claims
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1. A battery charger including a rectifier connected to a source of alternating voltage for generating a rectified sinusoidal halfwave voltage, the charger comprising;
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first gate-triggered switching means having an anode connected to a negative pole of a rechargeable battery and a cathode connected to a negative terminal of said rectifier for applying said sinusoidal halfwave voltage to the battery; trigger means connected between the negative pole of said battery and the gate of said first switching means for triggering the same into conduction to apply said voltage to said battery when the instantaneous value of the sinusoidal voltage is higher than the voltage of said battery; temperature responsive switching means for disconnecting said trigger means from said battery when said battery is heated to a temperature higher than a predetermined value, indicative of fully charged battery; and second gate-triggered switching means responsive to said temperature responsive switching means establishing a short-circuit path across the cathode and the gate of said first switching means to prevent further charging of the battery after it has been fully charged, notwithstanding a subsequent cooling of the battery below the predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification