Patent US558228A successfully refreshed from Google Patents.
Patent US5346231A successfully refreshed from Google Patents.
Patent US2274580A successfully refreshed from Google Patents.
Patent EP0190904A2 successfully refreshed from Google Patents.
EP0190904A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Series resonant converter
Assignee: Reliance Electric Co
•
Filing: 1986-02-03
•
Granted: —
•
Expires: 2006-02-03
Abstract
Abstract A series resonant converter is interposed between an unregulated voltage source and an output circuit. The converter employs a pair of power switches (52, 54) each, when on, completing a series resonant circuit from the source to a resonant tank circuit including the primary winding (56) of a transformer (22) coupled to the output circuit. The power switches (52, 54) are alternately turned on and off so that sinusoidal current pulses alternately flow in opposite directions in the primary winding at a frequency dependent on input and output conditions. The current flowing in the resonant circuit is monitored and the power switches are additionally controlled to prevent turn on of one switch and turn off of the other when more than minimal current is still flowing in the resonant circuit.
Inventors
- 👤 Louis Robert Nerone
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 06:14
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3376; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
174 words
A series resonant converter for supplying regulated power to an output circuit from an unregulated DC source, characterised in that it comprises: a series resonant circuit (20) including a primary winding (56) of a transformer (22) coupling said converter to a said output circuit; first and second actuatable switching means (52,54) each, when on, connecting said source with said series resonant circuit in such a manner that when said switching means are alternately turned on, sinusoidal current pulses alternately flow from said source in opposing directions in said primary winding; and control means (28,30) for normally actuating said switching means on and off alternately at an operating frequency depending upon loading conditions at said output circuit, said control means including additional control means for additionally controlling said switching means in dependence upon whether current is flowing in said resonant circuit in such a manner as to prevent one switching means from being turned on before the other switching means is turned off, except when minimal or no current is flowing in said resonant circuit.
Claim 2
Dependent Claim
174 words
A series resonant converter for supplying regulated power to an output circuit from an unregulated DC source, characterised in that it comprises: a series resonant circuit (20) including a primary winding (56) of a transformer (22) coupling said converter to a said output circuit; first and second actuatable switching means (52,54) each, when on, connecting said source with said series resonant circuit in such a manner that when said switching means are alternately turned on, sinusoidal current pulses alternately flow from said source in opposing directions in said primary winding; and control means (28,30) for normally actuating said switching means on and off alternately at an operating frequency depending upon loading conditions at said output circuit, said control means including additional control means for additionally controlling said switching means in dependence upon whether current is flowing in said resonant circuit in such a manner as to prevent one switching means from being turned on before the other switching means is turned off, except when minimal or no current is flowing in said resonant circuit.
Claim 3
Dependent Claim
102 words
A converter as claimed in claim 1, wherein said additional control means includes current detector means (170) for determining whether or not minimal or no current is flowing in said resonant circuit and providing a control signal (V 6 ) having a value in dependence upon said determination, and means (160) responsive to said control signal (V 6 ) for supplying a switch on signal (V 5 ) for controlling the operation of the switching means (52,54) only so long as said control signal (V 6 ) has a value indicative that minimal or no current is flowing in said resonant circuit.
Claim 4
Dependent Claim
61 words
A converter as claimed in claim 2, including switch select means (140) for selecting one of said switching means (52,54) to be on and switch driver means (142,144,146,148) for passing said switch on signal ( V 5) to actuate the selected switching means (52,54) to an on condition so that current flors resonant circuit by way of said selected switching means.
Claim 5
Dependent Claim
69 words
A converter as claimed in any preceding claim, including switch reversal means (134) for periodically supplying a switch reversal signal (V 3 ) commanding that one of said switching means (52,54) be turned on and the other be turned off, said switch reversal signals (V 3 ) being provided at a frequency depending on loading conditions and providing that minimal or no current is flowing in said resonant circuit.
Claim 6
Dependent Claim
40 words
A converter as claimed in claim 4 as appended to claim 3, wherein said switch select means (140) is responsive to said switch reversal signals (V 3 ) for alternately selecting one of said switching means (52,54) to be on.
Claim 7
Dependent Claim
132 words
A converter as claimed in claim 5, including means (130,132) for providing pulses (V 2 ) exhibiting a frequency which varies in dependence upon said loading conditions, said switch reversal means (134) being responsive to said pulses (V 2 ) and to said control signal (V 6 ) for supplying a said switch reversal signal (V 3 ) for each said pulse providing said control signal (V 6 ) is of a value indicative that minimal or no current is flowing in said resonant circuit, whereby said switch select means (140) will change its selection from one of said switching means to the other and the switch driver means (142,146 or 144,148) of the thus selected switching means will pass said switch on signal (V S ) to the selected switching means.
Claim 8
Dependent Claim
59 words
A converter as claimed in claim 6, wherein said switch reversal means is a logic gate (134) for providing a said switch reversal signal (V 3 ) in response to each said frequency pulse (V 2 ), providing said control signal(V 6 ) is of a value indicative that minimal or no current is flowing in said resonant circuit.
Claim 9
Dependent Claim
79 words
A converter as claimed in claim 2 or any one of claims 3 to 7 as appended to claim 2, wherein said means for providing a'said switch on signal (V 5 ) is a logic gate (160) having an input connected to said current detector means (170) for supplying a said switch on signal only so long as said control signal (V 6 ) has a value indicative that minimal or no current is flowing in said resonant circuit.
Claim 10
Dependent Claim
107 words
A converter as claimed in any one of claims 2 to 8, including current sensor means (72,74,76,78,80,82) coupled to said series resonant circuit for providing a current signal (I R ) which varies in magnitude and polarity with that of the alternating sinusoidal current pulses flowing in said series resonant circuit, said current detector means (170) being responsive to said current signal (I R ) for providing a said control signal (V 6 ) having a first value when minimal or no current is flowing in said series resonant circuit and a second value when a greater than minimal current is flowing, independently of the polarity thereof.
Claim 11
Dependent Claim
46 words
A converter as claimed in claim 9, whrein said current sensor means includes a current transformer (72,74,76) having a primary winding (74) connected in said series resonant circuit and a secondary winding (76) coupled to wave-shaping means (78,80,82) for providing said current signal (I R ).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.