Battery charger failure alarm circuit
First Claim
1. In a battery charger circuit including a source of rectified A.C. voltage coupled for charging a battery connected to said circuit and inductor means, serially connected between said source of rectified A.C. voltage and said battery, for filtering the rectified A.C. voltage prior to application of said battery, A.C. voltage being present across said inductor so long as said battery charger circuit is functioning to charge said battery, a battery charger failure alarm circuit including in combination:
- voltage divider means, electrically coupled to said inductor means, for dividing the voltage drop across said inductor means into at least two voltages including a first voltage;
isolation transformer means, electrically coupled to said voltage divider means, for transforming said first voltage into a second voltage;
rectifier means, electrically coupled to said isolation transformer means, for rectifying said second voltage;
a first transistor, said rectified second voltage being applied to the base of said first transistor for switching said transistor means to a conducting state;
a second transistor, the base of which is electrically coupled to said first transistor, said second transistor being switched from a non-conducting state to a conducting state in response to said first transistor being switched to a conducting state; and
alarm means, operating in response to said second transistor, for producing a sensory perceptive signal in the event that said first and second transistors are switched to a non-conducting state in response to the absence of A.C. volt age across said inductor means.
3 Assignments
0 Petitions
Accused Products
Abstract
A battery charger failure alarm circuit for use with a battery charger including a source of rectified AC voltage for charging a battery and a filtering inductor serially interposed between said charger circuit and battery and across which there appears AC ripple voltage so long as the battery charger is functioning properly, includes a sensing circuit coupled to the filtering inductor for sensing the presence of the AC ripple voltage and an alarm circuit coupled to the sensing circuit operable to indicate the failure of the battery charger circuit in response to a lack of sensed AC ripple voltage. A time delay circuit may be included in the battery charger failure alarm circuit between the sensing circuit and alarm circuit to delay the operation of the alarm circuit in the case of momentary loss of the AC ripple voltage.
14 Citations
11 Claims
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1. In a battery charger circuit including a source of rectified A.C. voltage coupled for charging a battery connected to said circuit and inductor means, serially connected between said source of rectified A.C. voltage and said battery, for filtering the rectified A.C. voltage prior to application of said battery, A.C. voltage being present across said inductor so long as said battery charger circuit is functioning to charge said battery, a battery charger failure alarm circuit including in combination:
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voltage divider means, electrically coupled to said inductor means, for dividing the voltage drop across said inductor means into at least two voltages including a first voltage; isolation transformer means, electrically coupled to said voltage divider means, for transforming said first voltage into a second voltage; rectifier means, electrically coupled to said isolation transformer means, for rectifying said second voltage; a first transistor, said rectified second voltage being applied to the base of said first transistor for switching said transistor means to a conducting state; a second transistor, the base of which is electrically coupled to said first transistor, said second transistor being switched from a non-conducting state to a conducting state in response to said first transistor being switched to a conducting state; and alarm means, operating in response to said second transistor, for producing a sensory perceptive signal in the event that said first and second transistors are switched to a non-conducting state in response to the absence of A.C. volt age across said inductor means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery charger failure alarm circuit for use with a battery charger circuit comprising a source of rectified AC voltage coupled to a battery for charging said battery and a filtering inductor interposed between said source of charging voltage and said battery, AC voltage being present across said inductor so long as said battery charger circuit is functioning properly to charge said battery, said battery charger failure alarm circuit including in combination:
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(a) a transformer; (b) a rectifier, said transformer coupling said AC voltage to said rectifier; (c) a transistor switch coupled to said rectifier, said transistor being selectively biased in accordance with the application of rectified, sensed AC voltage thereto; and (d) alarm means, operated in response to said transistor switch, for signaling the absence of said AC voltage across said inductor. - View Dependent Claims (9, 10, 11)
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Specification