Battery charger apparatus
First Claim
1. Apparatus for charging a battery from a multiphase power line, comprising:
- (A) an isolation transformer having a plurality of primary windings connected to said multiphase power line, and including a plurality of secondary windings;
(B) a multiphase power converter;
(C) converter control means for governing operation of said converter;
(D) a plurality of current conducting lines respectively connecting said secondary windings to said converter;
(E) synch signal generating means operable to provide an output synch signal indicative of the angle of voltage provided by said power line;
(F) current sensor means positioned to obtain an indication of the current in said current conducting lines and provide output signals indicative thereof;
(G) battery charger control means responsive to predetermined battery parameters for providing an indication of a desired battery charge current profile;
(H) processor means responsive to said charge current profile for generating a corresponding reference signal; and
(I) said converter control means being connected to receive (i) said output signals from said current sensor means, (ii) said synch signal and (iii) said reference signal, to generate and apply control signals to said converter to control said current in each said current conducting line to be substantially in phase with the voltage at the secondary to which said line is connected, and to provide a charging current in accordance with said profile.
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0 Petitions
Accused Products
Abstract
A battery charger which supplies charging current for a high voltage, high current battery in accordance with a charge profile which preferably includes both a charge pulse sequence as well as a discharge pulse sequence. Charging power is obtained from a three phase power line the voltage of which is reduced by an isolation transformer. Conversion of ac to dc is accomplished by a switching transistor power converter having a control for supplying transistor switching signals. The control is responsive to the angle of line voltage, the actual line current and a reference signal indicative of desired charge current, to generate the transistor switching signals. Any deviation between actual and desired current is then corrected by modification of the transistor switching signals.
46 Citations
12 Claims
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1. Apparatus for charging a battery from a multiphase power line, comprising:
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(A) an isolation transformer having a plurality of primary windings connected to said multiphase power line, and including a plurality of secondary windings; (B) a multiphase power converter; (C) converter control means for governing operation of said converter; (D) a plurality of current conducting lines respectively connecting said secondary windings to said converter; (E) synch signal generating means operable to provide an output synch signal indicative of the angle of voltage provided by said power line; (F) current sensor means positioned to obtain an indication of the current in said current conducting lines and provide output signals indicative thereof; (G) battery charger control means responsive to predetermined battery parameters for providing an indication of a desired battery charge current profile; (H) processor means responsive to said charge current profile for generating a corresponding reference signal; and (I) said converter control means being connected to receive (i) said output signals from said current sensor means, (ii) said synch signal and (iii) said reference signal, to generate and apply control signals to said converter to control said current in each said current conducting line to be substantially in phase with the voltage at the secondary to which said line is connected, and to provide a charging current in accordance with said profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification