EP0386980A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Switched-mode regulator circuit
Assignee: EMI Group Ltd
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Filing: 1990-03-05
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Granted: —
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Expires: 2010-03-05
Abstract
Abstract A switched-mode regulator circuit (20) is operative on an input unidirectional supply derived by a full wave rectifier (10) from an alternating supply (11) to provide an output unidirectional voltage to a load. The circuit contains switching means (26) for regulating the current drawn from the supply (11) and control means (27) effective, in operation, to render the switching means (26) alternately conductive and non-conductive to maintain the instantaneous magnitude of current drawn from the supply within a range of the instantaneous magnitude of a reference signal. The control means (27) includes means (40, 41, 42, 43; 60, 41, 42, 43) for varying the extent of this range so as to regulate the frequency at which the switching means (26) is rendered alternately conductive and non-conductive.
Inventors
- 👤 Ian Harry Clifford
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 08:00
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4225
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
110 words
A switched mode regulator circuit operative on an input unidirectional supply derived by a full wave rectifier from an alternating supply to provide an output unidirectional voltage to a load, the circuit containing switching means for regulating the current drawn from said supply and control means effective, in operation, to render said switching means alternately conductive and non-conductive to maintain the instantaneous magnitude of current drawn from the supply within a range of the instantaneous magnitude of a reference signal, said control means including means for varying the extent of said range so as to regulate the frequency at which the switching means is rendered alternately conductive and non conductive.
Claim 2
Dependent Claim
110 words
A switched mode regulator circuit operative on an input unidirectional supply derived by a full wave rectifier from an alternating supply to provide an output unidirectional voltage to a load, the circuit containing switching means for regulating the current drawn from said supply and control means effective, in operation, to render said switching means alternately conductive and non-conductive to maintain the instantaneous magnitude of current drawn from the supply within a range of the instantaneous magnitude of a reference signal, said control means including means for varying the extent of said range so as to regulate the frequency at which the switching means is rendered alternately conductive and non conductive.
Claim 3
Dependent Claim
23 words
A regulator circuit according to Claim 1 in which the control means is arranged so as to render the switching frequency substantially constant.
Claim 4
Dependent Claim
31 words
A regulator circuit according to Claims 1 in which the reference signal is related to the instantaneous magnitude of the unidirectional supply voltage thus maintaining a power factor substantially at unity.
Claim 5
Dependent Claim
32 words
A regulator circuit according to any one of the preceding claims wherein the instantaneous value of said range is dependent upon the instantaneous values of the output voltage and the input voltage.
Claim 6
Dependent Claim
44 words
A regulator circuit according to any one of the preceding claims including means for sensing the magnitude of the unidirectional voltage at the ouput and for varying the reference signal to maintain the output voltage substantially constant irrespective of variation in the alternating supply.
Claim 7
Dependent Claim
59 words
A regulator circuit according to any one of the preceding claims wherein the supply rail includes an inductor and a rectifier in series, with a capacitor connected between the supply lines on the output side of the rectifier and a switch connected across the rectifier and the capacitor such that the output voltage is always above the supply voltage.
Claim 8
Dependent Claim
69 words
A regulator circuit according to Claim 6 wherein the instantaneous value of said range is determined by the instantaneous value of a parameter V H , V H being derived according to the equation. V H =K*V I (V O -V I ) where K is a constant, V I is the instantaneous value of the input voltage and V O is the instantaneous value of the output voltage.
Claim 9
Dependent Claim
60 words
A regulator circuit according to any one of Claims 1 to 5 where the supply rail includes a switch and a rectifier in series, with a capacitor connected between the supply lines on the output side of the rectifier and an inductor connected across the rectifier and the capacitor such that the output voltage is always above the supply voltage.
Claim 10
Dependent Claim
60 words
A regulator circuit according to Claim 8 wherein the instantaneous value of said range is determined by the instantaneous value of a parameter V H , V H being derived according to the equation where K is a constant, V I is the instantaneous value of the input voltage and V O is the instantaneous value of the output voltage.
Claim 11
Dependent Claim
34 words
A regulator circuit according to any one of the preceding claims wherein said control means includes means for comparing the instanteous magnitude of the input current with the instantaneous magnitude of said reference signal.
Claim 12
Dependent Claim
58 words
A regulator circuit according to any one of the preceding claims, said switching means being rendered conductive for a first period and being rendered non-conductive for a second period, wherein said control means includes means for limiting at least one of said first and said second periods to a value which is a function of the input voltage.
Claim 13
Dependent Claim
31 words
A regulator circuit according to Claim 11 wherein said means for limiting consists of means for limiting said second period to a value which is a function of the input voltage.
Claim 14
Dependent Claim
41 words
A regulator circuit according to any one of the preceding claims further comprising an overvoltage protection circuit, said overvoltage protection circuit comprising means for comparing the output voltage with a reference voltage to prevent the output voltage exceeding the reference voltage.
Claim 15
Dependent Claim
21 words
A regulator circuit according to any one of the preceding claims wherein said control means is realised using an integrated circuit.
References Cited (Backward Citations)
No citation records indexed.
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