NESTED PULSE WIDTH MODULATION CONTROL
First Claim
1. A circuit, comprising:
- a first PWM driver adapted to receive duty cycle commands and operable to generate a first PWM driver signal having a duty cycle that varies based on the duty cycle commands;
a duty cycle compensator coupled to receive the first PWM driver signal and a sensor signal representative of a value of a sensed physical parameter, the duty cycle compensator operable to supply compensated duty cycle commands based on the duty cycle of the first PWM driver signal and the value of the sensed physical parameter; and
a second PWM driver coupled to receive the compensated duty cycle commands and operable to generate a hybrid PWM driver signal having a duty cycle that varies based on the compensated duty cycle commands.
1 Assignment
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Accused Products
Abstract
A PWM control circuit includes a first PWM driver, a duty cycle compensator, and a second PWM driver. The first PWM driver receives duty cycle commands and generates a first PWM driver signal having a duty cycle that varies based on the duty cycle commands. The duty cycle compensator receives the first PWM driver signal and a sensor signal representative of a value of a sensed physical parameter. The duty cycle compensator supplies compensated duty cycle commands based on the duty cycle of the first PWM driver signal and the value of the sensed physical parameter. The second PWM driver receives the compensated duty cycle commands and generates a hybrid PWM driver signal having a duty cycle that varies based on the compensated duty cycle commands. The resulting hybrid signal provides improved resolution for control that cannot be provided by a single PWM driver alone.
47 Citations
20 Claims
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1. A circuit, comprising:
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a first PWM driver adapted to receive duty cycle commands and operable to generate a first PWM driver signal having a duty cycle that varies based on the duty cycle commands; a duty cycle compensator coupled to receive the first PWM driver signal and a sensor signal representative of a value of a sensed physical parameter, the duty cycle compensator operable to supply compensated duty cycle commands based on the duty cycle of the first PWM driver signal and the value of the sensed physical parameter; and a second PWM driver coupled to receive the compensated duty cycle commands and operable to generate a hybrid PWM driver signal having a duty cycle that varies based on the compensated duty cycle commands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A solenoid valve control circuit, comprising:
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a first PWM driver adapted to receive duty cycle commands and operable to generate a first PWM driver signal having a duty cycle that varies based on the duty cycle commands; a duty cycle compensator coupled to receive the first PWM driver signal and a sensor signal representative of a value of a sensed physical parameter, the duty cycle compensator operable to supply compensated duty cycle commands based on the duty cycle of the first PWM driver signal and the value of the sensed physical parameter; a solenoid PWM driver coupled to receive the compensated duty cycle commands and operable to generate a solenoid PWM driver signal having a duty cycle that varies based on the compensated duty cycle commands; a solenoid valve coupled to receive the solenoid PWM driver signal and operable, in response thereto, to move between a closed position and an open position at the duty cycle of the solenoid PWM driver signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A control system for controlling the speed of a machine, comprising:
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a speed sensor operable to sense the speed of the machine and supply a speed feedback signal representative thereof; a pressure sensor operable to sense a pressure of a fluid used to drive the machine and supply a pressure signal representative thereof; a valve coupled to receive valve command signals having a duty cycle and operable, in response thereto, to move between an open position and a closed position at the duty cycle of the valve command signals to thereby control fluid flow to the machine; and a controller coupled to receive a speed command, the speed feedback signal, and the pressure signal and operable, in response thereto, to supply the valve command signals, the controller comprising; a comparator coupled to receive a speed command and the speed feedback signal and operable, in response thereto, to supply duty cycle commands representative of a difference between the speed command and the speed feedback signal, a first PWM driver coupled to receive the duty cycle commands and operable to generate a first PWM driver signal having a duty cycle that varies based on the duty cycle commands, a duty cycle compensator coupled to receive the first PWM driver signal and pressure signal, the duty cycle compensator operable to supply compensated duty cycle commands based on the duty cycle of the first PWM driver signal and the sensed pressure, and a valve PWM driver coupled to receive the compensated duty cycle commands and operable to supply the valve command signals at a duty cycle that varies based on the compensated duty cycle commands. - View Dependent Claims (18, 19, 20)
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Specification