Power MOS voltage regulator for batteries
First Claim
1. A voltage regulator in an automatic voltage charging system for a battery including an AC magneto generator having a three phase winding in which each phase winding is connectable to the battery and to earth, said voltage regulator comprising:
- a rectifier Schottky diode connected between each phase winding of the magneto generator and the battery and a power MOS transistor branched-off between each phase winding and an earth terminal; and
voltage control means comprising an electronic control unit for each phase winding connected to a control electrode of a respective power MOS transistor to drive the latter between ON and OFF states,each control unit being conformed and preset to detect a phase voltage of the magneto generator, respectively to detect the voltage of the battery, and to switch the power MOS transistor between the ON and OFF states when the detected phase voltage of the magneto generator is passing through zero,wherein all the power MOS transistors are maintained in an ON state when the battery voltage detected by the control units is higher than a rated charging value of the same battery.
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Accused Products
Abstract
A power MOS voltage regulator for recharging batteries of motor vehicles; a voltage generator is selectively connected to a battery, respectively to an earth by a controlled rectifier bridge. The rectifier bridge includes a Schottky diode connected between each phase winding of the generator and the positive terminal of the battery, and a power MOS transistor branched between the phase winding and the earth; a control electrode of the power MOS transistor is driven by a control circuit for controlling the charging state of the battery, to enable the changeover of the power MOS transistor between a conductive state and a non conductive state, and vice versa, when the voltage of the phase winding is zero.
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Citations
6 Claims
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1. A voltage regulator in an automatic voltage charging system for a battery including an AC magneto generator having a three phase winding in which each phase winding is connectable to the battery and to earth, said voltage regulator comprising:
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a rectifier Schottky diode connected between each phase winding of the magneto generator and the battery and a power MOS transistor branched-off between each phase winding and an earth terminal; and voltage control means comprising an electronic control unit for each phase winding connected to a control electrode of a respective power MOS transistor to drive the latter between ON and OFF states, each control unit being conformed and preset to detect a phase voltage of the magneto generator, respectively to detect the voltage of the battery, and to switch the power MOS transistor between the ON and OFF states when the detected phase voltage of the magneto generator is passing through zero, wherein all the power MOS transistors are maintained in an ON state when the battery voltage detected by the control units is higher than a rated charging value of the same battery. - View Dependent Claims (2)
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3. A system for automatically charging a battery of a motor vehicle comprising:
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a magneto generator having a three phase winding for generating a charge voltage for the battery; voltage control means comprising an electronic control unit for each phase winding including a rectifier Schottky diode connected between the phase winding and a positive terminal of the battery, and a power MOS transistor having a control electrode, and a Drain-Source circuit connected between the phase winding of the magneto generator and an earth terminal; the electronic control unit being conformed to drive the power MOS transistor between an ON and an OFF State; a battery voltage detecting circuit connected between the positive terminal of the battery and a battery voltage memory circuit in each control unit for detecting and comparing the voltage of a charge state of the battery, with respect to a rated charging voltage; a memory circuit in each control unit for memorizing the detected voltage of the battery, said memory circuit having an inlet side connected to said battery voltage detecting circuit; and a phase voltage detecting circuit in each control unit for detecting the voltage of the phase windings of the magneto generator, said phase voltage detecting circuit being connected between an outlet side of the memory circuit and the control electrode of the power MOS transistor; wherein said memory circuit and said phase voltage detecting circuit of the control units being conformed and preset to trigger the power MOS transistor between ON and OFF states, when the phase winding voltage, detected by said phase voltage detecting circuits, passes through zero value, and wherein all the power MOS transistors of the control units are maintained in an ON state when the battery voltage detected by the control units, is higher than the rated charging value of the same battery. - View Dependent Claims (4, 5, 6)
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Specification