Off-line controller having a line voltage detector and a switche

Details Off-line controller having a line voltage detector and a switche Off-line controller having a line voltage detector and a switche

1995-02-06

1996-07-02

Heyman, John S.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327338, 327 66, 323282, 363 21, G01R 1900

Patent

active

055326269

ABSTRACT:
An off-line controller circuit having a line voltage detector and a switched current bootstrap circuit. The controller receives current from the line and provides a drive signal for controlling the switch(es) of an off-line converter. The line voltage detector establishes a voltage proportional to the line voltage in response to a portion of the received line current. The proportional voltage is compared to a reference voltage to provide a control signal for inhibiting the drive signal when the proportional voltage is less than the reference voltage, indicating that the line voltage is less than a predetermined level. The switched current bootstrap circuit limits a bootstrap current provided to the controller supply voltage from the converter output in accordance with current shunted to ground by a supply voltage clamp. A switched current source is provided for sensing the current through the clamp and limiting the bootstrap current flow from the converter output to the supply voltage as a function of the sensed current.

REFERENCES:
patent: 3942102 (1976-03-01), Kuhn et al.
patent: 4251743 (1981-02-01), Hareyama
patent: 4331888 (1982-05-01), Yamauchi
patent: 4473759 (1984-09-01), Mahabadi
patent: 5028861 (1991-07-01), Pace et al.
patent: 5079453 (1992-01-01), Tisinger et al.
patent: 5245526 (1993-09-01), Balakrishnan et al.
patent: 5428287 (1995-06-01), Agiman

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