Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
A voltage regulation apparatus wherein changes in load current (Io) are not rapidly reflected in the input current (Ii), comprising, a power source for providing an input current (Ii), means (6) having a controllable duty cycle for pulse width modulating the input current (Ii) at a preselected frequency, filter means (10, 12) connected to the output of the means (6) for pulse width modulating, which removes the preselected frequency, a load connected to the output of the filter means (10, 12), a load voltage (Eo) appearing thereacross, first feedback means (24) responsive to the load voltage (Eo) for controlling the duty cycle of the pulse width modulator (6) so as to regulate the load voltage, said first feedback means (24) having a relatively long time constant so that changes in the load current (Io) are not rapidly reflected in the input current (Ii), and second feedback means (26) responsive to the load voltage (Eo) rising above a predetermined level for taking control of the duty cycle of the pulse width modulator (6), said second feedback means (26) having a relatively short time constant for more tightly regulating the load voltage (Eo) in those instances where such voltage rises above said predetermined level.
Claim 2
Dependent Claim
22 words
The apparatus of claim 1 wherein said filter means includes a capacitor (12), which sources and sinks changes in the load current.
Claim 3
Dependent Claim
22 words
The apparatus of claim 2 wherein each of said first and second feedback means (24, 26) includes operational amplifier means (28, 42).
Claim 4
Dependent Claim
21 words
The apparatus of claim 3 wherein the operational amplifier means (28, 42) are connected to an OR gate (18, 20, 22).
Claim 5
Independent Claim
112 words
The apparatus of anyone of the claims 1 to 4 wherein a reference voltage (V R1 , V R2 ) is fed to each operational amplifier means (28, 42), and wherein the reference voltage ((V R1 ) which is fed to the operational amplifier means (28) which is included in the first feedback means (24) has a smaller value than the reference voltage (V R2 ) which is fed to the operational amplifier means (42) which is included in the second feedback means (26), and wherein the reference voltage (V R2 ) which is fed to the operational amplifier (42) in the second feedback means (26) corresponds to said predetermined voltage level.
Claim 6
Independent Claim
218 words
An apparatus for providing regulated direct current (Io) from a three phase alternating current source, comprising, a three phase power source (70) which provides three phase input currents, a three phase rectifier (72) connected to said power source (70) for providing a direct current (Ii), means (6) having a controllable duty cycle for pulse width modulating the direct current (Ii) at a preselected frequency, filter means (10, 12) connected to the output of the means (6) for pulse width modulating, which removes the preselected frequency, a load connected to the output of the filter means (10, 12), a load voltage (Eo) appearing thereacross, first feedback means (24) responsive to the load voltage (Eo) for controlling the duty cycle of the pulse width modulator (6) so as to regulate the load voltage, said first feedback (24) means having a relatively long time constant so that changes in the load current (Io) are not rapidly reflected in the three phase input currents, and second feedback means (26) responsive to the load voltage (Eo) rising above a predetermined level for taking control of the duty cycle of the pulse width modulator (6), said second feedback means (26) having a relatively short time constant for more tightly regulating the load voltage in those instances where such voltage rises above said predetermined level.