Patent EP0343855A2 successfully refreshed from Google Patents.
EP0343855A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Zero voltage switching half bridge resonant converter
Assignee: AT&T Inc
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Filing: 1989-05-18
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Granted: —
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Expires: 2009-05-18
Abstract
Abstract A DC to DC converter combines a half-bridge inverter (211-213, 221-223) with a resonant rectifier (237, 241, 242) through a series LC circuit (226, 227) which conducts power at substantially a single frequency. Energy stored in the parasitic capacitors (213, 223) of the two power switches (211, 221) are transferred from one parasitic capacitor to the other in order to enhance efficiency of operation. The transfer is controlled by controlling the relative phase between the voltage and current in the inverter section.
Inventors
- 👤 Frank M. Magalhaes
- 👤 Roman Ostapiak
- 👤 Ralph Walk
- 👤 Norman G. Ziesse
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:32
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3376; H02M1/00; H02M1/0048; H02M1/0054; H02M1/0058; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A DC to DC converter including a half bridge inverter in which each power switch (211,221) includes a shunt diode (212,222) and a shunt capacitance (213,223), the shunt diode being operative to prevent reverse voltages across each power switch, CHARACTERISED BY a resonant rectifier including a rectifying diode (241) and sufficient associated reactive elements (237,242) for producing a substantial impedance transformation and operative for rectifying a substantially single frequency signal without creating ringing transients, a reactive circuit (226,227) inductive at the operating frequency connected in series with the input impedance of the resonant rectifier and operative for coupling energy at a single frequency from each power switch of the half bridge inverter to the resonant rectifier, and voltage regulation circuitry (Fig. 1:160, 170, 180) operative for varying a frequency of operation of the converter in order to vary an impedance of the reactive circuit and control a voltage applied to the input impedance of the rectifier.
Claim 2
Dependent Claim
156 words
A DC to DC converter including a half bridge inverter in which each power switch (211,221) includes a shunt diode (212,222) and a shunt capacitance (213,223), the shunt diode being operative to prevent reverse voltages across each power switch, CHARACTERISED BY a resonant rectifier including a rectifying diode (241) and sufficient associated reactive elements (237,242) for producing a substantial impedance transformation and operative for rectifying a substantially single frequency signal without creating ringing transients, a reactive circuit (226,227) inductive at the operating frequency connected in series with the input impedance of the resonant rectifier and operative for coupling energy at a single frequency from each power switch of the half bridge inverter to the resonant rectifier, and voltage regulation circuitry (Fig. 1:160, 170, 180) operative for varying a frequency of operation of the converter in order to vary an impedance of the reactive circuit and control a voltage applied to the input impedance of the rectifier.
Claim 3
Dependent Claim
44 words
A converter as claimed in claim 1 wherein the reactive circuit includes a series LC circuit having a large inductive (226) and capacitive (227) reactive impedance close in value to each other so that a relatively small frequency change produces a large impedance variation.
Claim 4
Dependent Claim
47 words
A converter as claimed in claim 1 or 2 wherein, in operation, the power switches (211,221) are enabled alternately conducting with an intervening nonconduction interval sufficient to allow a shunt capacitance associated with one power switch to discharge into a shunt capacitance associated with another power switch.
Claim 5
Dependent Claim
51 words
4 A converter as claimed in claim 1, 2 or 3 wherein the reactive elements (237,242) of the resonant rectifier define two frequency response poles related to the converter operating frequency so that an input impedance of the rectifier includes an input resistance substantially independent of frequency within the operating frequency.
Claim 6
Dependent Claim
53 words
A converter as claimed in any preceding claim wherein the voltage regulation circuitry includes means (160) for comparing an output voltage of the resonant rectifier with a reference voltage and generating an error voltage, and means (170) for varying a frequency of switching of the power switches in response to the error voltage.
References Cited (Backward Citations)
No citation records indexed.
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