Regulator circuit responsive to input voltage,output voltage and current

Claim 2

A regulator circuit for a controllable power supply having an output voltage with an AC component on output leads for connection to a load, amplifier means including first and second amplifiers, a filter connected across said output leads to filter the AC component, first means connected to said output leads on the power supply side of said filter and developing a first voltage signal, reference voltage means, means comparing said reference voltage means with said first voltage signal to develop a first error signal, means connecting said first amplifier responsive to said first error signal and connected to control the power supply to regulate the voltage to the output leads, second means connected across said output leads on the load side of said filter and developing an output voltage signal, means comparing said reference voltage means with said output voltage signal to develop a second error signal, and means connecting said second amplifier responsive to said second error signal and connected to control the power supply.

Claim 3

A regulator circuit as set forth in claim 1, including means connecting the output of said second amplifier to an input of said first amplifier.

Claim 4

A regulator circuit as set forth in claim 1, including current responsive means connected in one of said output leads, means comparing said reference voltage means with said current responsive means to develop a third error signal dependent on the current in said one of said output leads, and means connecting said amplifier means to be responsive to said third error signal and connected to control the power supply.

Claim 5

A regulator circuit as set forth in claim 3, including a third amplifier in said amplifier means, and means connecting said third amplifier responsive to said third error signal.

Claim 6

A regulator circuit as set forth in claim 4, including means connecting the output of said third amplifier to an input of said first amplifier.

Claim 7

A regulator circuit as set forth in claim 4, including means connecting the output of said second amplifier to an input of said first amplifier.

Claim 8

A regulator circuit as set forth in claim 4, including means connecting the output of said third amplifier to an input of said second amplifier.

Claim 9

A regulator circuit as set forth in claim 1, including a current signal amplifier, a resistive shunt connected in one of said output leads, a reference signal, means connecting said current signal amplifier in circuit with said resistive shunt and said reference signal to establish current limiting upon the voltage across said shunt exceeding the voltage of said reference signal, and means connecting the output of said current signal amplifier to an input of said second amplifier to control the output current in said output leads.

Claim 10

A regulator circuit as set forth in claim 8, wherein said output voltage is rectified from an alternating current, and said filter including an L-C filter connected in said output leads between said shunt and said first means developing a first voltage signal.

Claim 11

A regulator circuit as set forth in claim 1, wherein said second means developing an output voltage signal is a Second resistive voltage divider having an output tap, a feedback resistor connected around said second amplifier, and means connecting said output tap to an input of said second amplifier.

Claim 12

A regulator circuit as set forth in claim 1, wherein said second means developing a second voltage signal includes a second resistive voltage divider, a first reference voltage in said reference voltage means, and means connecting said second voltage divider and first reference voltage in series across said output leads with said reference voltage in opposition to the voltage across said output leads.

Claim 13

A dual loop voltage regulator and current limit circuit, comprising in combination, a controllable rectifier operable from an alternating current input and having a DC output voltage on output leads, an input voltage control loop, an output voltage control loop, and a current limit control loop, said input voltage control loop including a first resistive voltage divider across said output leads and having a first tapoff connection, a feedback resistor and an input resistor, an operational amplifier connected in circuit with said feedback and input resistors as a multiplier and connected to said first tapoff connection of said voltage divider to multiply any error signal in the voltage on said rectifier output terminals, means connecting the output of said multiplier operational amplifier to control said controlled rectifier to maintain the voltage to the output leads of the rectifier substantially constant, an L-C filter connected in said output leads, a resistive shunt connected in said output leads as a part of said current limit control loop, output terminals on the distal ends of said output leads, said output voltage control loop having a second resistive voltage divider and a first reference voltage connected in series across the output terminals of said output leads, said second resistive voltage divider having an output tap, a second operational amplifier, a second feedback resistor connected around said second operational amplifier, means to connect said second operational amplifier to said output tap of said second resistive voltage divider, means connecting the output of said second operational amplifier to an input of said first operational amplifier, said current limit control loop including a second voltage reference connected to the positive output terminal of said output leads, a third operational amplifier having a feedback resistor connected thereacross and connected through a first input resistor to said second voltage reference to establish a current limit threshold, a second input resistor to said third operational amplifier connected to the positive input terminal of said shunt resistor to coact with the feedback resistor across said third operational amplifier to establish current limiting upon the voltage across said shunt exceeding the voltage of said second reference voltage, and means connecting the output of said third operational amplifier to an input of said second operational amplifier to control the output current in said output leads.

Claim 14

A dual loop voltage regulator and current limit circuit, comprising in combination, a controllable rectifier operable from an alternating current input and having a DC output voltage on output leads, an input voltage control loop, an output voltage control loop, and a current limit control loop, said input voltage control loop including a first resistive voltage divider across said output leads and having a first tapoff connection, a feedback resistor and an input resistor, an operational amplifier connected in circuit with said feedback and input resistors as a multiplier and connected to said first tapoff connection of said voltage divider to multiply any error signal in the voltage on said rectifier output terminals, means connecting the output of said multiplier operational amplifier to control said controlled rectifier to maintain the voltage to the output leads of the rectifier substantially constant, an L-C filter connected in said output leads, a resistive shunt connected in said output leads as a part of said current limit control loop, output terminals on the distal ends of said output leads, said output voltage control loop having a second resistive voltage divider and a first reference voltage connected in series across the output terminals of said output leads, said second resistive voltage divider having an output tap, a second operational amplifier, a second feedback resistor connected around said second operational amplifier, means to connect said second operational amplifier to said output tap of said second resistive voltage divider, means connecting the output of said second operational amplifier to an input of said first operational amplifier, said current limit control loop including a second voltage reference connected to the positive output terminal of said output leads, a third operational amplifier having a feedback resistor connected thereacross and connected through a first input resistor to said second voltage reference to establish a current limit threshold, a second input resistor to said third operational amplifier connected to the positive input terminal of said shunt resistor to coact with the feedback resistor across said third operational amplifier to establish current limiting upon the voltage across said shunt exceeding the voltage of said second reference voltage, and means connecting the output of said third operational amplifier to an input of said second operational amplifier to control the output current in said output leads.

Claim 15

A regulator circuit for a controllable power supply having an output voltage on output leads for connection to a load, a first operational amplifier, first means connected to said output leads developing a first voltage signal, reference voltage means, means comparing said reference voltage means with said first voltage signal to develop an error signal applied to said operational amplifier, means connecting the output of said first operational amplifier to control the power supply to regulate the voltage to the output leads, a current signal operational amplifier, current responsive means connected in one of said output leads, a reference signal, means connecting said current signal operational amplifier in circuit with said current resPonsive means and said reference signal to establish current limiting upon the voltage across said current responsive means exceeding the voltage of said reference signal, and means connecting the output of said current signal operational amplifier to an input of said first operational amplifier to control the output current in said output leads.

Claim 16

A regulator circuit for a controllable power supply having an output voltage on output leads for connection to a load, a first operational amplifier, first means connected to said output leads developing a first voltage signal, reference voltage means, means comparing said reference voltage means with said first voltage signal to develop an error signal applied to said operational amplifier, means connecting the output of said first operational amplifier to control the power supply to regulate the voltage to the output leads, a current signal operational amplifier, current responsive means connected in one of said output leads, a reference signal, means connecting said current signal operational amplifier in circuit with said current resPonsive means and said reference signal to establish current limiting upon the voltage across said current responsive means exceeding the voltage of said reference signal, and means connecting the output of said current signal operational amplifier to an input of said first operational amplifier to control the output current in said output leads.

Claim 17

A regulator circuit as set forth in claim 13, wherein said current signal operational amplifier has an input including a resistive shunt as said current responsive means and an input resistor in series, a feedback resistor connected around said current signal operational amplifier to cooperate with said input, a diode connected in the output circuit of said current signal operational amplifier, whereby upon the voltage signal from said resistive shunt becoming greater than that from said reference signal, the polarity of the total input to said current signal operational amplifier reverses and is passed by said diode to establish the current limit threshold and establishes limiting of the current carried in said output leads.

Claim 18

A regulator circuit as set forth in claim 13, wherein said current signal operational amplifier has an input including said reference signal and an input resistor in series, a feedback resistor connected around said current signal operational amplifier to cooperate with said input, a diode connected in the output circuit of said current signal operational amplifier with a polarity to prevent conduction through the operational amplifier from said reference signal, said reference signal having a polarity opposite to that from said current responsive means to normally establish said current signal operational amplifier in a nonconducting condition, whereby upon the voltage signal from said resistive current responsive means becoming greater than that from said reference signal, the polarity of the total input to said current signal operational amplifier reverses and is passed by said diode to establish the current limit threshold and establishes limiting of the current carried in said output leads.

Claim 19

A regulator circuit as set forth in claim 13, wherein said current signal operational amplifier has two inputs in parallel, one input being a resistive shunt as said current responsive means and an input resistor in series, the other input being said reference signal and another input resistor in series, a feedback resistor connected around said current signal operational amplifier to cooperate with each of the two inputs, a diode connected in the output circuit of said current signal operational amplifier with a polarity to prevent conduction through the operational amplifier from said reference signal, said reference signal having a polarity opposite to that of said shunt to normally establish said current signal operational amplifier in a nonconducting condition, whereby upon the voltage signal from said resistive shunt becoming greater than that from said reference signal, the polarity of the total input to said current signal operational amplifier reverses and is passed by said diode to establish the current limit threshold and establishes limiting of the current carried in said output leads.