EP0944162A1
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EP
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Auto-synchronized DC/DC converter and method of operating same
Assignee: Alcatel Lucent SAS
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Filing: 1998-03-19
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Granted: —
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Expires: 2018-03-19
Abstract
Abstract A DC/DC converter comprising a buck stage that includes a buck switch, a push-pull stage that includes push-pull switches, and a controller to control the switching phases of the buck and push-pull switches. The turn-on phases of these buck and push-pull switches are automatically and continuously adjusted to an optimal value at each occurrence of a synchronization pulse produced at a fixed frequency by an auto-synchronization circuit. <IMAGE>
Inventors
- 👤 Michel Gak
- 👤 Giorgio Trusgnach
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 20:27
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3372; H02M3/3374; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A DC/DC converter comprising buck stage means (11) that includes buck
switch means (12), push-pull stage means (13) that includes switch means (14A,
14B) and control means (17) to control the switching phases of said buck switch
means and push-pull switch means, characterised in that it comprises
autosynchronizing means (19) adapted to produce synchronisation pulses (T SYNC ) at
a fixed frequency and to automatically and continuously adjust the turn-on phases of
said buck switch means and of said push-pull switch means to an optimal value at
each occurrence of a synchronization pulse.
Claim 2
Dependent Claim
108 words
A DC/DC converter according to claim 1, characterised in that the
autosynchronizing means (19) comprises synchronization pulse generator means to
generate a synchronization pulse (T SYNC ) at a fixed frequency for the control of said
control means (17) and for turning on a drive pulse (T BUCK ) for said buck switch
means (12), pulse width measuring means responsive to the said synchronization
pulse (T SYNC ) to measure the width of each drive pulse (T BUCK ), push-pull command
generator means responsive to said pulse width measuring means to produce
command signals for the control of the switching phase of said push-pull switch
means (14A, 14B).
Claim 3
Dependent Claim
45 words
A DC/DC converter according to claim 1 or 2, characterised in that said
control means (17) comprises regulation means adapted to adjust the width of said
buck drive pulse (T BUCK ) in such a way that the buck output voltage reaches a
predetermined value.
Claim 4
Dependent Claim
51 words
A DC/DC converter according to claim 3, characterised in that the regulation
means comprises a voltage regulation loop to compare the buck output voltage with a
reference voltage and a current regulation loop to control the buck output current in
order to allow the output voltage to reach the correct value.
Claim 5
Independent Claim
99 words
A method of synchronizing the switching phases in a DC/DC converter
comprising switchable buck stage means (11) and switchable push-pull stage means
(13), said switchable buck stage means being controlled by drive pulses (T BUCK ) and
said switchable push-pull stage means being controlled by command signals (CKL-PPA,
CKL-PPB), characterized in that said push-pull command signals are
produced by the steps of measuring the width of said drive pulses (T BUCK ) and of
centering the gap time (T GAP ) between the turn-on phases of said command signals
(CKL-PPA, CKL-PPB) with the buck drive pulses (T BUCK ).
Claim 6
Dependent Claim
64 words
A method according to claim 5, characterised in that the step of centering the
gap time (T GAP ) between the turn-on phases of said command signals comprises the
steps of sampling each drive pulse (T BUCK ) over two buck switching periods, and
dividing by 2 the number of sampling clock periods to determine the turn-on points of
said push-pull command signals respectively.
References Cited (Backward Citations)
US4656570A
Cited
EP0613233A1
Cited
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