Battery charging system for road vehicles
First Claim
1. A battery charging system for a road vehicle comprising in combination a pair of alternators each having a rectifier and an associated field winding, a pair of voltage regulators controlling the field current of each alternator in accordance with the voltage at the output of the associated rectifier, each voltage regulator including a voltage sensing circuit connected across the rectifier output and an oscillatory switching circuit arranged to oscillate between conductive and non-conductive states when the voltage across the voltage sensing circuit exceeds a predetermined value, the field winding of the associated alternator being connected to be controlled by said switching circuit, and cross coupling means connecting the switching circuit of each voltage regulator to the voltage sensing circuit of the other regulator, so that oscillatory switching of one switching circuit causes oscillatory switching of the other switching circuit.
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Abstract
A battery charging system includes a pair of alternators having rectified outputs which are connected in parallel. The field currents of the respective alternators are controlled by respective oscillatory switching circuits which are responsive to rectified output voltages from the respective alternators. Each respective switching circuit is coupled to an output voltage sensing circuit of the other alternator, so that oscillatory switching of one switching circuit causes oscillatory switching of the other switching circuit.
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Citations
6 Claims
- 1. A battery charging system for a road vehicle comprising in combination a pair of alternators each having a rectifier and an associated field winding, a pair of voltage regulators controlling the field current of each alternator in accordance with the voltage at the output of the associated rectifier, each voltage regulator including a voltage sensing circuit connected across the rectifier output and an oscillatory switching circuit arranged to oscillate between conductive and non-conductive states when the voltage across the voltage sensing circuit exceeds a predetermined value, the field winding of the associated alternator being connected to be controlled by said switching circuit, and cross coupling means connecting the switching circuit of each voltage regulator to the voltage sensing circuit of the other regulator, so that oscillatory switching of one switching circuit causes oscillatory switching of the other switching circuit.
Specification