EP1049239A1
Expired / Lapsed
EP
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Power factor correction controller circuit
Assignee: Motorola Solutions Inc
•
Filing: 1999-04-30
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Granted: —
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Expires: 2019-04-30
Abstract
Abstract A power factor correction controller circuit 100 for controlling the duration of each on time phase and off time phase of a switched inductor power factor correction circuit 20, 30, 40, 50, 100 which is adapted for use with a rectifying arrangement 9, 10, 60, 70 producing a substantially regulated output voltage, Vo. The controller circuit 100 comprises an input terminal 114 for receiving a signal representative of Vo; an output terminal 131 for outputting a signal representative of the duration of each on time phase and off time phase; and on time determination means 110, 111, 112, 113, 114, 115, 116, 117; wherein the on time determination means acts to vary the maximum duration of each on time phase in an inverse dependence on Vo.
Inventors
- 👤 Francois L'hermite
- 👤 Joel Turchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 08:58
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4225; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
104 words
A power factor correction controller circuit for controlling the duration of
each on time phase and off time phase of a switched inductor power factor
correction circuit which is adapted for use with a rectifying arrangement
producing a substantially regulated output voltage, Vo, said controller circuit
comprising an input terminal for receiving a signal representative of Vo; an
output terminal for outputting a signal representative of the duration of each on
time phase and off time phase; and on time determination means; wherein the
on time determination means acts to vary the duration of each on time phase in
an inverse dependence on Vo.
Claim 2
Dependent Claim
27 words
A controller circuit as claimed in claim 1 further comprising a voltage
regulator which acts to prevent the output voltage Vo from exceeding a
predetermined maximum value.
Claim 3
Dependent Claim
17 words
A controller circuit as claimed in claim 2 wherein the voltage regulator is a
low gain regulator.
Claim 4
Dependent Claim
38 words
A controller circuit as claimed in claim 3 wherein the voltage regulator
acts to influence or over-ride the on time determination means to rapidly reduce
the duration of each on time phase as Vo approaches the predetermined value.
Claim 5
Dependent Claim
62 words
A controller circuit as claimed in any one of the preceding claims wherein
the on time determination means comprises a signal generator for generating an
increasing or decreasing signal and a comparator for comparing the increasing
or decreasing signal with an on time reference signal and detecting when the
increasing or decreasing signal exceeds or falls below the on time reference
signal
Claim 6
Dependent Claim
44 words
A controller circuit as claimed in claim 5 wherein the increasing or
decreasing signal varies between an initial value at the start of each on time
phase and the value of the on time reference signal at the end of each on time
phase.
Claim 7
Dependent Claim
42 words
A controller as claimed in claim 6 when dependent upon claim 2 wherein
the on time reference signal is produced by the voltage regulator and
approaches the initial value of the increasing or decreasing signal as Vo
approaches its predetermined maximum value.
Claim 8
Dependent Claim
64 words
A controller as claimed in any one of claims 5 to 7 when dependent upon
claim 2 wherein the signal generator comprises an on time capacitor the voltage
across which increases from an initial value at a rate which depends upon Vo,
and a voltage comparator which compares the voltage across the capacitor with
an on time reference voltage generated by the voltage regulator.
Claim 9
Dependent Claim
48 words
A controller as claimed in claim 8 wherein the signal generator further
includes an on time resistor connected to the output voltage Vo so as to
generate a current signal whose value depends upon the value of Vo for
charging the on time capacitor at the desired rate.
Claim 10
Dependent Claim
34 words
A controller as claimed in any one of the preceding claims wherein the on
time determination means includes a multiplier for multiplying a signal
representative of Vo into a signal representative of Vo squared.
Claim 11
Dependent Claim
92 words
A power factor correction controller circuit for controlling the duration of
each on time phase and off time phase of a switched inductor power factor
correction circuit which is adapted for use with a rectifying arrangement
producing a substantially regulated output voltage, Vo, said controller circuit
including current measurement means for measuring the current flowing through
the power factor correction circuit, said current measurement means comprising
a voltage detection device for connection across an in-rush resistor to measure
the voltage across the in-rush resistor and programmable means for enabling
programmable over-current detection.
Claim 12
Dependent Claim
59 words
A controller circuit as claimed in claim 11 wherein the voltage detection
device is adapted for operation as a zero-current threshold detector for
detecting, during the off time of the power factor correction circuit when in use,
when the voltage across the in-rush resistor falls below a predetermined zero-current
threshold value representing substantially zero-current flow through the
in-rush resistor.
Claim 13
Dependent Claim
69 words
A controller circuit as claimed in either one of claims 11 or 12 wherein the
voltage detection device is adapted for operation as an over-current threshold
detector for detecting, during each on time phase of the power factor correction
circuit when in use, when the voltage exceeds a predetermined over-current
threshold value representing the maximum current which is to be permitted to
flow through the power factor correction circuit.
Claim 14
Dependent Claim
33 words
A controller circuit as claimed in any one of claims 11 to 13 wherein the
voltage detector comprises a comparator for comparing the voltage across the
in-rush resistor with an in-rush reference voltage.
Claim 15
Dependent Claim
67 words
A controller circuit as claimed in claim 14 wherein
the programmable means comprises an over-current voltage-offset generator
which may be switched on and off during the on time and off time (or vice-versa)
of the power factor correction circuit when in use, for generating an over-current
voltage-offset which may be added to or subtracted from either the voltage
across the in-rush resistor or the in-rush reference voltage.
Claim 16
Dependent Claim
48 words
A controller circuit as claimed in claim 15 wherein the programmable
means includes an over-current resistor, wherein the magnitude of the over-current
voltage-offset depends upon the resistance of the over-current resistor,
whereby the over-current detection threshold may be programmed by selecting
the appropriate resistance of the over-current resistor.
Claim 17
Dependent Claim
40 words
A controller circuit as claimed in claim 16 wherein the over-current
resistor is connected between the in-rush resistor and the voltage detection
device whereby the over-current voltage-offset is either added to or subtracted
from the voltage across the in-rush resistor.
Claim 18
Dependent Claim
19 words
A switched inductor power factor correction circuit incorporating a
controller as claimed in any one of the preceding claims.
Claim 19
Dependent Claim
18 words
An ac to dc voltage regulator incorporating a controller as claimed in any
one of the preceding claims.
References Cited (Backward Citations)
WO1985001400A1
Cited
US5440473A
Cited
EP0688076A1
Cited
EP0689280A2
Cited
US5661394A
Cited
US5804950A
Cited
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