Control circuit for compensating for power variations utilizing controlled multipliers or dividers

Claim 2

A compensating circuit, comprising: power supply means for producing a power signal which undesirably varies from a predetermined value; transducer means For measuring a quantity and producing at an output an output signal proportional thereto, said transducer means being coupled to said power supply and undesirably varying said output signal when said power signal varies from said predetermined value; reference means for generating a reference signal having a value corresponding to said predetermined value for said power signal; control means coupled to said power supply and said reference means for generating a control signal having a value proportional to the deviation between the values of said power signal and said reference signal; and proportioning means coupled to the output of said transducer means for multiplying said output signal by a factor proportional to the value of said control signal, whereby the multiplied output signal is proportional to said measured quantity and independent of the varying value of said power signal.

Claim 3

The compensating circuit of claim 1 wherein said control means generate pulses corresponding to said control signal and having a duty cycle proportional to the deviation between the values of said power signal and said reference signal, said duty cycle corresponding to said value of said control signal, said proportioning means multiplying said output signal by a factor proportional to the duty cycle of said pulses.

Claim 4

The compensating circuit of claim 2 wherein said proportioning means includes gating means coupled between said transducer means and an output terminal for the multiplied output signal, and bias means coupling said control means to said gating means for causing said pulses to drive said gating means between on and off conduction states in accordance with the duty cycle of said pulses.

Claim 5

The compensating circuit of claim 3 wherein said transducer means modulates the output signal in proportion to the measured quantity, and said bias means connects said gating means in a demodulator circuit for demodulating said modulated output signal in accordance with the duty cycle of said pulses.

Claim 6

The compensating circuit of claim 1 wherein said control means includes a first input coupled to said reference means and a second input coupled to said power supply, a summing point, means coupling said first input to said summing point, gating means having a conducting and nonconducting states under control of the value of said control signal, and means coupling said gating means between said second input and said summing point.

Claim 7

The compensating circuit of claim 5 wherein said control means includes in cascade integrator means coupled to said summing point for generating an integrated output and switching means coupled to the integrator means for generating a control signal having a duty cycle proportional to the summation of the first input and gated second input, said switching means being coupled to said gating means to switch the gating means between said states in direct proportion to the duty cycle of the control signal.

Claim 8

The compensating circuit of claim 6 wherein said proportioning means includes second gating means having conducting and nonconducting states for translating said output signal to an output terminal for the multiplied output signal, and bias means coupling the output of said switching means to said second gating means for switching the state of said gating means in proportion to the duty cycle of said control signal.

Claim 9

A compensating circuit, comprising: power supply means for producing an AC power signal; transducer means for measuring a quantity and producing an output signal proportional thereto, said transducer means being coupled to said power supply and undesirably varying said output signal when said power signal varies from a predetermined value; a DC reference signal having an amplitude corresponding to a desired amplitude for said AC power signal; control means including rectifier functioning means coupled to said power supply for producing an average rectified AC power signal, and means cOupled to said reference means and said rectifier functioning means for subtracting said average rectified AC power signal from said DC reference signal to generate a control signal having a value proportional to the deviation between the values of said AC power signal and said DC reference signal; and proportioning means coupled between said power supply means and an output terminal for the measured quantity for multiplying one of said signals by a factor proportional to the value of said control signal, whereby the output signal at said output terminal is proportional to said measured quantity and independent of the varying value of said power signal.

Claim 10

A compensating circuit, comprising: power supply means for producing an AC power signal; transducer means for measuring a quantity and producing an output signal proportional thereto, said transducer means being coupled to said power supply and undesirably varying said output signal when said power signal varies from a predetermined value; a DC reference signal having an amplitude corresponding to a desired amplitude for said AC power signal; control means including rectifier functioning means coupled to said power supply for producing an average rectified AC power signal, and means cOupled to said reference means and said rectifier functioning means for subtracting said average rectified AC power signal from said DC reference signal to generate a control signal having a value proportional to the deviation between the values of said AC power signal and said DC reference signal; and proportioning means coupled between said power supply means and an output terminal for the measured quantity for multiplying one of said signals by a factor proportional to the value of said control signal, whereby the output signal at said output terminal is proportional to said measured quantity and independent of the varying value of said power signal.

Claim 11

The compensating circuit of claim 8 wherein said rectifier functioning means includes gating means under control of said control signal, first impedance means including said gating means coupled between said power supply and said subtraction means, and second impedance means coupled between said power supply and said subtraction means, said second impedance means having an impedance less than the impedance of said first impedance means, whereby the average of the AC power signals through said first and second impedance means produces said average rectified signal.

Claim 12

A circuit for compensating for changes in amplitude of an AC power signal produced by an AC power supply, comprising: a plurality of transducer means each measuring a quantity for producing at separate outputs a separate output signal proportional thereto, said transducer means each being coupled through a power input to said power supply and undesirably varying the separate output signals when said AC power signal varies in amplitude; reference means for generating a DC signal having a fixed amplitude representative of a desired amplitude for said AC power signal; control means coupled to said power supply and said reference means for generating a control signal having a duty cycle proportional to the amplitude difference between said power signal and said reference signal; and a plurality of divider means each coupled to a corresponding output of each transducer means for dividing the output signals by a factor proportional to the duty cycle of said control signal, whereby the divided output signals are independent of the varying amplitude of said AC power signal.

Claim 13

A circuit for compensating for changes in amplitude of an AC power signal produced by an AC power supply, comprising: a plurality of transducer means each measuring a quantity for producing at separate outputs a separate output signal proportional thereto, said transducer means each being coupled through a power input to said power supply and undesirably varying the separate output signals when said AC power signal varies in amplitude; reference means for generating a DC signal having a fixed amplitude representative of a desired amplitude for said AC power signal; control means coupled to said power supply and said reference means for generating a control signal having a duty cycle proportional to the amplitude difference between said power signal and said reference signal; and a plurality of divider means each coupled to a corresponding output of each transducer means for dividing the output signals by a factor proportional to the duty cycle of said control signal, whereby the divided output signals are independent of the varying amplitude of said AC power signal.

Claim 14

The compensating circuit of claim 10 wherein said control means includes means for effectively rectifying said AC power signal, means for subtracting the rectified AC power signal from said DC signal to produce a difference signal, means for integrating said difference signal, and switching means responsive to the integrated difference signal exceeding a predetermined level for generating a pulse, said pulse corresponding to said control signal and having a duty cycle proportional to the amplitude difference between said power signal and said reference signal.

Claim 15

The compensating circuit of claim 11 wherein said rectifying means includes gating means for translating a signal in proportion to the duty cycle of pulses coupled to the gating means, and means coupling the switching means to said gating means for controlling said gating means by the pulses from said switching means, whereby said control means forms a time division multiplier.