Bandwidth limit circuit for step voltage regulator

Claim 2

In a step voltage regulator adapted to maintain its output voltage within upper and lower bandwidth limit, a bandwidth limit sensing circuit comprising means for providing a sample voltage which is a function of the regulator output voltage, a predetermined reference voltage source, means including a bandwidth setting potentiometer for deriving a lower limit reference potential which is a preselected fraction of said reference voltage, means coupled to said reference voltage source and to said potentiometer for deriving an upper limit reference potential whose magnitude is equal to the sum of said reference voltage plus the difference between said reference voltage and said lower limit reference potential, and first and second voltage comparator means for comparing said sample voltage respectively to said upper limit reference potential and to said lower limit reference potential.

Claim 3

In the combination of claim 1 wherein said means for deriving an upper limit reference potential includes a unity gain inverter operational amplifier having inputs coupled respectively to said reference voltage source and to the wiper of said bandwidth setting rheostat, the output of said inverter amplifier being an input to said first voltage comparator means.

Claim 4

In the combination of claim 2 wherein said reference voltage is applied across a voltage divider including the resistance element of said bandwidth setting rheostat and said lower limit reference potential is derived at the wiper of said bandwidth setting rheostat.

Claim 5

In the combination of claim 1 and including calibrating means for adjusting said sample voltage to be equal to that of said reference voltage source when the regulator output voltage is of desired magnitude potential.

Claim 6

In a step voltage regulator adapted to maintain its output voltage within upper and lower bandwidth limits, a bandwidth limit sensing circuit comprising means for providing a sample voltage which is a function of the regulator output voltage, a predetermined reference voltage source, means including a bandwidth setting potentiometer having its resistance element in a circuit coupled across said reference voltage source for deriving a lower limit reference potential at the wiper of said potentiometer which is a preselected fraction of said reference voltage, lower limit comparator means for comparing said sample voltage to said lower limit reference potential, a unity gain inverter operational amplifier having inputs coupled respectively to said potentiometer wiper and to said reference voltage source, whereby the output of said inverter amplifier is greater than said reference voltagE by the difference between said reference voltage and said lower limit reference potential, and upper limit comparator means for comparing said sample voltage to the output voltage from said inverter operational amplifier.

Claim 7

In a step voltage regulator adapted to maintain its output voltage within upper and lower bandwidth limits, a bandwidth limit sensing circuit comprising means for providing a sample voltage which is a function of the regulator output voltage, a predetermined reference voltage source, means including a bandwidth setting potentiometer having its resistance element in a circuit coupled across said reference voltage source for deriving a lower limit reference potential at the wiper of said potentiometer which is a preselected fraction of said reference voltage, lower limit comparator means for comparing said sample voltage to said lower limit reference potential, a unity gain inverter operational amplifier having inputs coupled respectively to said potentiometer wiper and to said reference voltage source, whereby the output of said inverter amplifier is greater than said reference voltagE by the difference between said reference voltage and said lower limit reference potential, and upper limit comparator means for comparing said sample voltage to the output voltage from said inverter operational amplifier.

Claim 8

In the combination of claim 5 and including calibrating means for adjusting said sample voltage to be equal to the reference voltage when the regulator output voltage is of desired magnitude.

Claim 9

In the combination of claim 6 wherein said lower limit comparator means includes an operational amplifier which receives said sample voltage and said lower limit reference potential respectively on its inverting and noninverting inputs.

Claim 10

In the combination of claim 7 wherein said upper limit comparator means includes an operational amplifier which receives said sample voltage on its inverting input and the output of said inverter amplifier on its noninverting input.

Claim 11

In a step voltage regulator adapted to maintain its output voltage within upper and lower bandwidth limits, a bandwidth limit sensing circuit comprising means for providing a sample voltage which is a function of the regulator output voltage, a predetermined reference voltage source, a voltage divider including the resistance element of a bandwidth setting rheostat connected across said reference voltage source, a lower limit voltage comparator operational amplifier which receives said sample voltage on its inverting input and has its noninverting input coupled to the wiper of said bandwidth setting rheostat, an upper limit voltage comparator operational amplifier which receives said sample voltage on its inverting input, and a unity gain operational amplifier having said reference voltage applied to its noninverting input and its inverting input coupled to said wiper of said bandwidth setting rheostat and its output coupled to the noninverting input of said upper limit sensing operational amplifier.

Claim 12

In a step voltage regulator adapted to maintain its output voltage within upper and lower bandwidth limits, a bandwidth limit sensing circuit comprising means for providing a sample voltage which is a function of the regulator output voltage, a predetermined reference voltage source, a voltage divider including the resistance element of a bandwidth setting rheostat connected across said reference voltage source, a lower limit voltage comparator operational amplifier which receives said sample voltage on its inverting input and has its noninverting input coupled to the wiper of said bandwidth setting rheostat, an upper limit voltage comparator operational amplifier which receives said sample voltage on its inverting input, and a unity gain operational amplifier having said reference voltage applied to its noninverting input and its inverting input coupled to said wiper of said bandwidth setting rheostat and its output coupled to the noninverting input of said upper limit sensing operational amplifier.

Claim 13

In the combination of claim 9 and including calibrating means for making said sample and reference voltages equal when the regulator output voltage is of the desired magnitude.