Pulse width modulator digital servo system

A pulse width modulator for producing a pulse width modulated output signal in response to a digital input, comprising

• counter means for counting to a predetermined count level,
• set means for periodically setting said counter means to a set count level representative of such digital input,
• pulse generator means for delivering a series of pulses to said counter means for counting thereof from such set count level to such predetermined count level, and
• pulse width modulating output means for producing an output signal that is pulse width modulated in accordance with the setting of said counter means and the achieving of such predetermined count level thereby.

A pulse width modulator digital servo system, comprising

• servo means having a changeable physical parameter for adjusting such parameter in response to a pulse width modulated control signal,
• transducer means for producing a transducer signal indicative of the actual state of such parameter,
• digital means coupled to said transducer means for producing digital information indicative of the actual state of such parameter and a desired state thereof, including
• detector means for directly converting such transducer signal to a digital feedback signal,
• command means for combining command information indicative of the desired state of such parameter with such feedback signal to produce such digital information, said command means comprising a summing junction, and
• such feedback signal and such command information being in binary format and said summing junction comprising multiple bit parallel adder means for adding such binary feedback signal and binary command information to produce such digital information also in a binary format as a resultant signal, and
• pulse width modulating output means coupled to said digital means and to said servo means for developing such control signal and pulse width modulating the same in accordance with such digital information.

A pulse width modulator digital servo system, comprising

• servo means having a changeable physical parameter for adjusting such parameter in response to a pulse width modulated control signal,
• transducer means for producing a transducer signal indicative of the actual state of such parameter,
• digital means coupled to said transducer means for producing digital information indicative of the actual state of such parameter and a desired state thereof, including
• detector means for directly converting such transducer signal to a digital feedback signal, and
• command means for combining command information indicative of the desired state of such parameter with such feedback signal to produce such digital information,
• pulse width modulating output means coupled to said digital means and to said servo means for developing such control signal and pulse width modulating the same in accordance with such digital information, and
• latch circuit means for storing such digital information produced by said command means and delivering such stored digital information to said pulse width modulating output means, and means for periodically opening said latch circuit means to receive updated digital information.

A pulse width modulator digital servo system, comprising

• servo means having a changeable physical parameter for adjusting such parameter in response to a pulse width modulated control signal,
• transducer means for producing a transducer signal indicative of the actual state of such parameter,
• digital means coupled to said transducer means for producing digital information indicative of the actual state of such parameter and a desired state thereof, including
• detector means for directly converting such transducer signal to a digital feedback signal,
• command means for combining command information indicative of the desired state of such parameter with such feedback signal to produce such digital information, said command means comprising a summing junction means for generating such command information, and
• such feedback signal and such command information being in digital format and said summing junction means comprising a multiple bit parallel adder means for adding such binary feedback signal and binary command information to produce such digital information also in a binary format as a resultant signal, and
• pulse width modulating output means coupled to said digital means and to said servo means for developing such control signal and pulse width modulating the same in accordance with such digital information.

A pulse width modulator digital servo system, comprising

• servo means having a changeable physical parameter for adjusting such parameter in response to a pulse width modulated control signal,
• transducer means for producing a transducer signal indicative of the actual state of such parameter,
• a digital means coupled to said transducer means for producing digital information indicative of the actual state of such parameter and a desired state thereof, including
• detector means for directly converting such transducer signal to a digital feedback signal, and
• command means for combining command information indicative of the desired state of such parameter with such feedback signal to produce such digital information, said command means comprising summing junction means for generating such command information, and
• pulse width modulating output means coupled to said digital means and to said servo means for developing such control signal and pulse width modulating the same in accordance with such digital information, said pulse width modulating output means developing a balanced control signal when such digital information produced by said command means is at a predetermined value and an unbalanced control signal when such digital information is other than such predetermined value.

A pulse width modulator digital servo system, comprising

• servo means having a changeable physical parameter for adjusting such parameter in response to a pulse width modulated control signal,
• transducer means for producing a transducer signal indicative of the actual state of such parameter,
• digital means coupled to said transducer means for producing digital information indicative of the actual state of such parameter and a desired state thereof, including
• detector means for directly converting such transducer signal to a digital feedback signal, and
• command means for combining command information indicative of the desired state of such parameter with such feedback signal to produce such digital information, and
• pulse width modulating output means coupled to said digital means and to said servo means for developing such control signal and pulse width modulating the same in accordance with such digital information,
• said servo means comprising a servo actuator including movable means for assuming a physical positional relationship in said servo actuator in response to fluid pressure therein, such parameter being such positional relationship, and electro-hydraulic valve means responsive to such pulse width modulated control signal to control the fluid pressure in said servo actuator and, thus, the position of said movable means.

A pulse width modulator digital servo system, comprising

• servo means having a changeable physical parameter for adjusting such parameter in response to a pulse width modulated control signal,
• transducer means for producing a transducer signal indicative of the actual state of such parameter, said transducer means comprising linear variable phase transformer means for phase modulating such transducer signal with respect to such parameter,
• digital means coupled to said transducer means for producing digital information indicative of the actual state of such parameter and a desired state thereof, including
• detector means for directly converting such transducer signal to a digital feedback signal, said detector means comprising digital phase detector means for developing a digital feedback signal in binary format indicative of such physical parameter, and
• command means for combining command information indicative of the desired state of such parameter with such feedback signal to produce such digital information, and
• pulse width modulating output means coupled to said digital means and to said servo means for developing such control signal and pulse width modulating the same in accordance with such digital information,
• said servo means including a movable member and such physical parameter resulting from displacement of said movable member and said servo means, such digital feedback signal being indicative of the actual position of said movable member in said servo means, and such command information being indicative of the desired position of said movable member in said servo means.

A pulse width modulator for producing a pulse width modulated output signal in response to a digital input, comprising

• counter means for counting to a predetermined count level, said counter means including a plurality of jam inputs,
• set means for periodically setting said counter means to a set count level representative of such digital input, said set means comprising means for operating said counter means to strobe input information into said counter means to set the same at such set count level,
• pulse generator means for delivering a series of pulses to said counter means for counting thereof from such set count level to such predetermined count level, and
• pulse width modulating output means for producing an output signal that is pulse width modulated in accordance with the setting of said counter means and the achieving of such predetermined count level thereby.

A pulse width modulator for producing a pulse width modulated output signal in response to a digital input, comprising

• counter means for counting to a predetermined count level,
• set means for periodically setting said counter means to a set count level representative of such digital input, said set means comprising a sync pulse generator that produces a brief sync pulse at a first frequency to set said counter means at such set count level,
• pulse generator means for delivering a series of pulses to said counter means for counting thereof from such set count level to such predetermined count level, and
• pulse width modulating output means for producing an output signal that is pulse width modulated in accordance with the setting of said counter means and the achieving of such predetermined count level thereby.

A pulse width modulator for producing a pulse width modulated output signal in response to a digital input, comprising

• counter means for counting to a predetermined count level,
• set means for periodically setting said counter means to a set count level representative of such digital input,
• pulse generator means for delivering a series of pulses to said counter means for counting thereof from such set count level to such predetermined count level, and
• pulse width modulating output means for producing an output signal that is pulse width modulated in accordance with the setting of said counter means and the achieving of such predetermined count level thereby, and further comprising
• servo actuator means coupled to said output means for assuming a physical positional relationship in response to such pulse width modulated output signal, and transducer means responsive to said servo actuator means for developing feedback signals indicative of the relative position thereof and digital means for developing such set count level representative of such feedback signal.

A pulse width modulator digital servo system, comprising

• servo means having a changeable physical parameter for adjusting such parameter in response to a pulse width modulated control signal,
• transducer means for producing a transducer signal indicative of the actual state of such parameter,
• digital means coupled to said transducer means for producing digital information indicative of the actual state of such parameter and a desired state thereof, including
• detector means for directly converting such transducer signal to a digital feedback signal, and
• command means for combining command information indicative of the desired state of such parameter with such feedback signal to produce such digital information, and
• pulse width modulating output means coupled to said digital means and to said servo means for developing such control signal and pulse width modulating the same in accordance with such digital information, said pulse width modulating means comprising counter means for counting to a predetermined count level, set means for periodically setting said counter means to a set count level representative of such digital information, pulse generator means for delivering a series of pulses to said counter means for counting thereof from such set count level to such predetermined count level, and flip-flop output means for producing such control signal and modulating the same in accordance with the setting of said counter means and the achieving of such predetermined count level thereby.