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Methods and apparatus to power an exercise machine are disclosed herein. An example method includes measuring a power supply current produced by a user of the exercise machine. A rotations per minute of the exercise machine is measured. A power supply reference current is determined, the power suppl

Methods and apparatus to power an exercise machine are disclosed herein. An example method includes measuring a power supply current produced by a user of the exercise machine. A rotations per minute of the exercise machine is measured. A power supply reference current is determined, the power supply reference current based on a user selected wattage and the rotations per minute. A differential power supply current is calculated based on the power supply reference current and a measured current of a power supply of the exercise machine. A power supply duty cycle is calculated based on a previous power supply duty cycle, a time constant, the differential power supply current, and a previous differential power supply current, the power supply duty cycle to control power supplied to a console of the exercise machine. The power supply duty cycle is output to a power output controller.

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1. A method to power an exercise machine, the method comprising: measuring a power supply current produced by a user of the exercise machine;measuring a rotations per minute of the exercise machine;determining a power supply reference current, the power supply reference current based on a user selec

1. A method to power an exercise machine, the method comprising: measuring a power supply current produced by a user of the exercise machine;measuring a rotations per minute of the exercise machine;determining a power supply reference current, the power supply reference current based on a user selected wattage and the rotations per minute;calculating, with a processor, a differential power supply current based on the power supply reference current and a measured current of a power supply of the exercise machine;calculating, with the processor, a power supply duty cycle based on a previous power supply duty cycle, a time constant, the differential power supply current, and a previous differential power supply current, the power supply duty cycle to control power supplied to a console of the exercise machine; andoutputting the power supply duty cycle to a power output controller. 2. The method as described in claim 1, wherein the time constant is a first time constant, and further including: calculating a torque value based on a measured brake current and the power supply reference current;calculating a differential torque value based on a reference torque value and the calculated torque value;calculating a brake current duty cycle based on a previous brake current duty cycle, a second time constant, the torque value, and the differential torque value, the brake current duty cycle to control resistance of a brake of the exercise machine;outputting the brake current duty cycle to a brake controller of the exercise machine. 3. The method as described in claim 2, wherein the brake current duty cycle is further based on a proportional gain value. 4. The method as described in claim 2, wherein the brake current duty cycle is output as a pulse width modulated signal. 5. The method as described in claim 2, further including calculating the reference torque based on the user selected wattage and the rotations per minute of the exercise machine. 6. The method as described in claim 5, wherein the reference torque is further calculated based on a mechanical constant. 7. The method as described in claim 1, further including receiving the user selected wattage from the console of the exercise machine. 8. The method as described in claim 1, wherein the power supply duty cycle is output as a pulse width modulated output. 9. The method as described in claim 1, further including setting the power supply reference current to zero when the rotations per minute of the exercise machine is less than a rotations per minute threshold. 10. The method as described in claim 1, further including setting the power supply reference current to zero when a rectified generator output voltage of the exercise machine is less than a voltage threshold. 11. A tangible computer readable medium comprising instructions which, when executed, cause a machine to at least: measure a power supply current produced by a user of the exercise machine;measure a rotations per minute of the exercise machine;determine a power supply reference current, the power supply reference current based on a user selected wattage and the rotations per minute;calculate, with a processor, a differential power supply current based on the power supply reference current and a measured current of a power supply of the exercise machine;calculate, with the processor, a power supply duty cycle based on a previous power supply duty cycle, a time constant, the differential power supply current, and a previous differential power supply current, the power supply duty cycle to control power supplied to a console of the exercise machine; andoutput the power supply duty cycle to a power output controller. 12. The tangible computer readable storage medium as described in claim 11, wherein the time constant is a first time constant, and wherein the instructions, when executed, cause the machine to at least: calculate a torque value based on a measured brake current and the power supply reference current;calculate a differential torque value based on a reference torque value and the calculated torque value;calculate a brake current duty cycle based on a previous brake current duty cycle, a second time constant, the torque value, and the differential torque value, the brake current duty cycle to control resistance of a brake of the exercise machine; andoutput the brake current duty cycle to a brake controller of the exercise machine. 13. The tangible computer readable storage medium as described in claim 12, wherein the brake current duty cycle is further based on a proportional gain value. 14. The tangible computer readable storage medium as described in claim 12, wherein the brake current duty cycle is output as a pulse width modulated signal. 15. The tangible computer readable storage medium as described in claim 12, wherein the instructions, when executed, cause the machine to at least calculate the reference torque based on the user selected wattage and the rotations per minute of the exercise machine. 16. The tangible computer readable storage medium as described in claim 15, wherein the reference torque is further calculated based on a mechanical constant. 17. The tangible computer readable storage medium as described in claim 11, wherein the instructions, when executed, cause the machine to at least receive the user selected wattage from the console of the exercise machine. 18. The tangible computer readable storage medium as described in claim 11, wherein the power supply duty cycle is output as a pulse width modulated signal. 19. The tangible computer readable storage medium as described in claim 11, wherein the instructions, when executed, cause the machine to at least set the power supply reference current to zero when the rotations per minute of the exercise machine is less than a rotations per minute threshold. 20. The tangible computer readable storage medium as described in claim 11, wherein the instructions, when executed, cause the machine to at least set the power supply reference current to zero when a rectified generator output voltage of the exercise machine is less than a voltage threshold.