Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
A power supply having a regulated output terminal and a plurality of unregulated output terminals and comprising:- a rectification circuit having a primary circuit for connection to a source of alternating current and a secondary circuit connected to supply predetermined voltages to each of the terminals; a current transformer connected in series between the regulated terminal and the secondary circuit; the power supply including a first control circuit having a power controller responsive to deviation of the output voltage at the regulated terminal and connected to vary power flow in the primary circuit to reduce said deviation, variations in primary circuit power flow destabilizing the predetermined voltages at the unregulated outputs, and a second control circuit having means responsive to variation of power flow in the primary circuit and connected to vary voltage across the circuit transformer to reduce said deviation and reduce thereby said variation in primary circuit power flow.
Claim 2
Dependent Claim
151 words
A power supply having a regulated output terminal and a plurality of unregulated output terminals and comprising:- a rectification circuit having a primary circuit for connection to a source of alternating current and a secondary circuit connected to supply predetermined voltages to each of the terminals; a current transformer connected in series between the regulated terminal and the secondary circuit; the power supply including a first control circuit having a power controller responsive to deviation of the output voltage at the regulated terminal and connected to vary power flow in the primary circuit to reduce said deviation, variations in primary circuit power flow destabilizing the predetermined voltages at the unregulated outputs, and a second control circuit having means responsive to variation of power flow in the primary circuit and connected to vary voltage across the circuit transformer to reduce said deviation and reduce thereby said variation in primary circuit power flow.
Claim 3
Dependent Claim
35 words
A power supply as claimed in Claim 1, wherein the current transformer has primary windings connected in series between the regulated terminal and the secondary circuit and secondary windings connected to the second control circuit.
Claim 4
Dependent Claim
64 words
A power supply as claimed in Claim 2, wherein the second control circuit comprises a series connected transistor and resistor, together connected in parallel with said secondary windings, and a comparator circuit connected to supply the transistor control terminal with control signals derived from a comparison of a signal indicative of variation of power flow in the primary circuit with a predetermined signal level.
Claim 5
Dependent Claim
44 words
A power supply as claimed in any preceding claim, including a limiting circuit connected between the second control circuit and the power controller and responsive to current flow to said regulated terminal above a predetermined threshold to reduce power flow through the rectification circuits.
Claim 6
Dependent Claim
28 words
A power supply as claimed in any preceding claim, wherein the power controller comprises a switching transistor operated by a pulse width modulation unit responsive to said deviation.
Claim 7
Dependent Claim
48 words
A power supply as claimed in Claim 5, wherein the first control circuit includes a comparator circuit connected to said regulated terminal and connected to a predetermined voltage level to produce a control signal for application to the pulse width modulation unit which is indicative of said deviation.
Claim 8
Dependent Claim
27 words
A power supply as claimed in Claim 6, including an opto isolating unit connected between the pulse width modulation unit and the first control circuit comparator circuit.