Series resonant battery charger and control therefor
First Claim
1. A battery charging circuit of the series resonant type including a resonant circuit adapted to be coupled to a battery for charging the battery and first and second thyristors connected in the resonant circuit for alternately supplying current to said circuit, and a control for selectively operating said thyristors, comprising:
- sensing means for sensing current flowing in the resonant circuit;
fault anticipation means coupled to said sensing means and responsive to the magnitude of the sensed current for outputting a firing signal in response to the attainment by the sensed current of a first, higher level and the subsequent diminution of said current below a second, lower level;
a variable time delay stage coupled to said fault anticipation means for outputting a trigger signal a determinable period of time after receipt of said firing signal;
gating means operated by said variable time delay stage for alternately enabling said first and second thyristors; and
controller means coupled to said variable time delay stage for varying the point at which said trigger signal occurs.
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Accused Products
Abstract
An inverting circuit of the series resonant type and including a pair of SCR'"'"'s operated at variable off-times for controlling the charging of a battery. A control circuit is provided for gating the SCR'"'"'s at appropriate times in response to sensed circuit current, and battery voltage. Instantaneous resonant circuit current is monitored to derive timing information for firing the SCR'"'"'s and for anticipating commutation failures.
36 Citations
21 Claims
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1. A battery charging circuit of the series resonant type including a resonant circuit adapted to be coupled to a battery for charging the battery and first and second thyristors connected in the resonant circuit for alternately supplying current to said circuit, and a control for selectively operating said thyristors, comprising:
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sensing means for sensing current flowing in the resonant circuit; fault anticipation means coupled to said sensing means and responsive to the magnitude of the sensed current for outputting a firing signal in response to the attainment by the sensed current of a first, higher level and the subsequent diminution of said current below a second, lower level; a variable time delay stage coupled to said fault anticipation means for outputting a trigger signal a determinable period of time after receipt of said firing signal; gating means operated by said variable time delay stage for alternately enabling said first and second thyristors; and controller means coupled to said variable time delay stage for varying the point at which said trigger signal occurs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery charging system of the series resonant type including a resonant circuit adapted to be coupled to a battery for charging the battery and further including first and second thyristors connected in the resonant circuit for alternately supplying current to said resonant circuit, and a control for selectively operating said thyristors, comprising:
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sensing means for sensing current flowing in said resonant circuit; fault anticipation means coupled to said sensing means and operative to output a firing signal subsequent to the attainment by the sensed current of a first, minimum value; and gating means coupled to said fault anticipation means for alternately enabling said first and second thyristors in response to alternate ones of said firing signals. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A battery charging system of the series resonant type including a resonant circuit adapted to be coupled to a battery for charging the battery and first and second thyristors connected in the resonant circuit for alternately supplying current to said resonant circuit, and a control for selectively operating said thyristors comprising:
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first current sensing means for sensing current flowing in said resonant circuit; fault anticipation means coupled to said sensing means and responsive to the magnitude of the sensed current for outputting a firing signal in response to the diminution of said current below a predetermined, low level; a variable time delay stage coupled to said fault anticipation means for outputting a trigger signal a determinable period of time after receipt of said firing signal; gating means operated by said variable time delay stage for alternately enabling said first and said second thyristors; and controller means coupled to said variable time delay stage for varying the point at which said trigger signal is produced. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification