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An H-bridge switching topology for bi-directional field excitation to null the effects of a rotor's permanent magnets uses both a low-side and a high-side field excitation driver to control the rotor's average field current. A standard proportional control signal for generators using uni-directional

An H-bridge switching topology for bi-directional field excitation to null the effects of a rotor's permanent magnets uses both a low-side and a high-side field excitation driver to control the rotor's average field current. A standard proportional control signal for generators using uni-directional field excitation is used to control an H-bridge for bi-directional field excitation. The H-bridge consists of two pair of power switches. In a preferred embodiment, the switches are n-channel MOSFETs. A drive circuit interfaces a logic block with the H-bridge in order to properly bias the power switches.

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What is claimed is: 1. A voltage regulator comprising: a logic block; a controller having a field driver control output operably connected to a first input of said logic block; an H-bridge; a drive block operably connected between said H-bridge and said logic block; and a control module operably co

What is claimed is: 1. A voltage regulator comprising: a logic block; a controller having a field driver control output operably connected to a first input of said logic block; an H-bridge; a drive block operably connected between said H-bridge and said logic block; and a control module operably connected between said controller and said drive block, wherein said voltage regulator is capable of regulating an output voltage of an alternator, and said logic block comprises: a counter having an output, whereby a number of clock cycles that occur when a field driver control signal is high is counted; and a comparator, whereby said output from said counter is compared to a threshold a predetermined consecutive number of times, whereby field duty cycle noise is filtered. 2. The voltage regulator according to claim 1, wherein said H-bridge comprises: a first pair of switches, comprising a first and a second switch connected in series; a second pair of switches, comprising a third and a fourth switch connected in series, wherein said first and second pair of switches arc operably connected in parallel across a power source; and a rotor operably connected between said series connections of said first and second pair of switches. 3. The voltage regulator according to claim 2, wherein said alternator comprises a rotor, wherein said rotor utilizes a permanent magnet in order to generate electrical power. 4. The voltage regulator according to claim 1, wherein said controller is a proportional controller for uni-directional field excitation. 5. The voltage regulator according to claim 1, wherein said control module comprises: an output operably connected to an input of said controller, whereby a pulse width modulated signal is transmitted to said controller; and an input operably connected to an output of said logic block, whereby said control module receives a torque demand signal. 6. The voltage regulator according to claim 1, wherein said alternator comprises a rotor, wherein said rotor utilizes a permanent magnet in order to generate electrical power. 7. A voltage regulator comprising: a logic block; a controller having a field driver control output operably connected to a first input of said logic block; an H-bridge; a drive block operably connected between said H-bridge and said logic block; and a control module operably connected between said controller and said drive block, wherein said voltage regulator is capable of regulating an output voltage of an alternator, said H-bridge comprises: a first pair of switches, comprising a first and a second switch connected in series; a second pair of switches, comprising a third and a fourth switch connected in series, wherein said first and second pair of switches are operably connected in parallel across a power source; and a rotor operably connected between said series connections of said first and second pair of switches, and said driver block comprises: an AND gate having a mode signal input and an inverted field driver signal input and a fourth output operably connected to a control input of said fourth switch, whereby said fourth output signal's duty cycle equal said field driver signal's duty cycle when said mode signal is low; a third output signal operably connected to a control input of said third switch, whereby said third switch is on when said mode signal is low; a first output signal operably connected to a control input of said first switch, whereby said first switch is on when said mode signal is high; and a pulse width modulation circuit having a mode signal input and a second output operably connected to a control input of said second switch, whereby said second switch is pulse modulated on and off when said mode signal is high. 8. The voltage regulator according to claim 7, wherein said alternator comprises a rotor, wherein said rotor utilizes a permanent magnet in order to generate electrical power. 9. The voltage regulator according to claim 7, wherein said controller is a proportional controller for uni-directional field excitation. 10. The voltage regulator according to claim 7, wherein said control module comprises: an output operably connected to an input of said controller, whereby a pulse width modulated signal is transmitted to said controller; and an input operably connected to an output of said logic block, whereby said control module receives a torque demand signal. 11. A voltage regulator comprising: a logic block; a controller having a field driver control output operably connected to a first input of said logic block; an H-bridge; a drive block operably connected between said H-bridge and said logic block; and a control module operably connected between said controller and said drive block, wherein said voltage regulator is capable of regulating an output voltage of an alternator, said H-bridge comprises: a first pair of switches, comprising a first and a second switch connected in series; a second pair of switches, comprising a third and a fourth switch connected in series, wherein said first and second pair of switches are operably connected in parallel across a power source; and a rotor operably connected between said series connections of said first and second pair of switches, and said driver block comprises: a mode signal input and a pulse width modulation input operably connected to corresponding outputs of said logic block; a first output signal operably connected to a control input of said first switch, whereby said first switch is on when said mode signal is high; a second output operably connected to a control input of said second switch, whereby said second switch is pulse modulated on and off when said made signal is high; a third output signal operably connected to a control input of said third switch, whereby said third switch is on when said mode signal is low; and a fourth output operably connected to a control input of said fourth switch, whereby said fourth output signal's duty cycle equal said field driver control signal's duty cycle when said mode signal is low. 12. The voltage regulator according to claim 11, wherein said logic block comprises: a counter having an output, whereby a number of clock cycles that occur when a field driver control signal is high is counted; and a comparator, whereby said output from said counter is compared to a threshold a predetermined consecutive number of times, whereby field drive duty cycle noise is filtered. 13. The voltage regulator according to claim 12, wherein said alternator comprises a rotor, wherein said rotor utilizes a permanent magnet in order to generate electrical power. 14. The voltage regulator according to claim 11, wherein said alternator comprises a rotor, wherein said rotor utilizes a permanent magnet in order to generate electrical power. 15. The voltage regulator according to claim 11, wherein said controller is a proportional controller for uni-directional field excitation. 16. The voltage regulator according to claim 11, wherein said control module comprises: an output operably connected to an input of said controller, whereby a pulse width modulated signal is transmitted to said controller; and an input operably connected to an output of said logic block, whereby said control module receives a torque demand signal.