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EP0447637A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Power supply control circuit

Assignee: HP Inc
•
Filing: 1990-12-11
•
Granted: —
•
Expires: 2010-12-11
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Abstract

Abstract A power supply control circuit which enables the constant current (CC) and constant voltage (CV) feedback loops to be compensated independent of each other. In accordance with the invention, an inner feedback loop (202) has been added which is local to the output stage (108) so as to allow a constant voltage (CV) feedback loop (112-120) to see a closed loop transfer function of the inner feedback loop (202) that mimics an output for a constant voltage (CV) preferred output stage even though a constant current (CC) preferred output stage is used. As a result, load impedance (118) variations that would have affected the loop gain of the constant voltage (CV) feedback loop (112-120) affect the loop gain of the inner feedback loop (202) only. The inner feedback loop (202) is disposed such that it is automatically disabled by the constant current (CC) feedback loop (102-110) when the power supply enters the constant current (CC) mode and hence allows the constant current (CC) and constant voltage (CV) modes to be decoupled from one another. The inner feedback loop (202) of the invention may also be disposed within the constant current (CC) feedback loop so as to allow independent mode operation for a constant voltage (CV) preferred output stage (108).

Inventors

  • 👤 Neil J. Yosinski

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 18:14
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/563

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 139 words
A power supply control circuit for a power supply operative in constant current (CC) and constant voltage (CV) modes, characterized by: a first control loop (102-110), having a first loop gain, for controlling said power supply during operation in one of said modes (CC); a second control loop (112-120), having a second loop gain, for controlling said power supply during operation in the other of said modes (CV); an output stage (108) shared by said first and second control loops, said output stage having a transfer function associated therewith and one of said modes as a preferred operating mode; and means (202) for decoupling the transfer function of said output stage (108) such that said first loop gain has no effect on said second loop gain and said second loop gain has no effect on said first loop gain.
Claim 2
Dependent Claim 110 words
A control circuit as in claim 1, characterized in that said decoupling means (202) comprises a feedback loop (120, 202, 116) from an output of said output stage (108), said feedback loop (120, 202, 116) comprising a series connection of an amplifier (120), a filter (206) and a diode (116), said diode (116) being shared with a nonpreferred control loop which controls said power supply during operation in the mode (CC or CV) other than said preferred operating mode (CV or CC) and being connected so as to disable said nonpreferred control loop and said feedback loop (120, 202, 116) when the preferred operating mode (CV or CC) is selected.
Claim 3
Dependent Claim 56 words
A control circuit as in claim 2, characterized in that said decoupling means (202) further comprises means (204) for allowing a signal fed back through said feedback loop (120, 202, 116) to mimic a transfer function of an output stage (108) having the nonpreferred mode (CC or CV) as its preferred operating mode (CV or CC).
Claim 4
Dependent Claim 37 words
A control circuit as in one of the claims 1 to 3, characterized in that said transfer function of said output stage (108) is insensitive to an impedance of a load (118) connected to an output thereof.
Claim 5
Dependent Claim 76 words
A control circuit as in one of the claims 1 to 4, characterized in that said first and second control loops each includes a gate (106, 116), each gate (106, 116) being disposed such that a gate (106, 116) in an operational control loop is closed while a gate (106, 116) in a non-operational control loop is opened, thereby enabling said first and second control loops to control said output stage (108) independent of each other.

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