Power supply for an ozone generator with a bridge inverter
First Claim
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1. A power supply comprising:
- a source of D.C. voltage having positive and negative outputs;
first and second unilateral current conducting switches connected in series in the order named between said positive and negative outputs, respectively, said first and second switches meeting at a first junction;
first and second unilateral current conducting devices respectively connected in anti-parallel with said first and second switches;
third and fourth unilateral current conducting switches connected in series in the order named between said positive and negative outputs, said third and fourth switches meeting at a second junction;
third and fourth unilateral current conducting devices respectively connected in anti-parallel with said third and fourth switches;
a transformer having primary and secondary windings;
means for coupling said primary winding between said first and second junctions, whereby current is permitted to flow only in one direction between said outputs when either of said first and fourth switches or said second and third switches are conducting, said means for coupling exhibiting series resonance at a given frequency when said secondary winding is coupled to a load;
control means for biasing both said first and fourth switches for conduction, and both said second and third switches for conduction only during respective alternate periods of time having intervals between them, the sum of two periods and two intervals being greater than a period of said given frequency; and
said control means biasing said third switch for conduction during intervals occurring immediately after the biasing of both said first and fourth switches for conduction ceases, and biasing said fourth switch for conduction during intervals occurring immediately after the biasing of both said second and third switches for conduction ceases.
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Abstract
A full bridge switching power supply is coupled to an ozonator load via a series resonant circuit having a resonant frequency above the switching frequency. Power output is controlled by varying the duration of the times when diagonal switches are conducting, and the output voltage has a longer rise time than fall time due to there being intervals between the conduction periods of diagonal switches during which one of the switches is turned on to permit resonant current flow. The driving voltages for attaining this action are symmetrical rectangular waves of identical shape having different phases that are derived from out of phase pulses where width is varied by the timing of their trailing edges.
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Citations
11 Claims
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1. A power supply comprising:
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a source of D.C. voltage having positive and negative outputs; first and second unilateral current conducting switches connected in series in the order named between said positive and negative outputs, respectively, said first and second switches meeting at a first junction; first and second unilateral current conducting devices respectively connected in anti-parallel with said first and second switches; third and fourth unilateral current conducting switches connected in series in the order named between said positive and negative outputs, said third and fourth switches meeting at a second junction; third and fourth unilateral current conducting devices respectively connected in anti-parallel with said third and fourth switches; a transformer having primary and secondary windings; means for coupling said primary winding between said first and second junctions, whereby current is permitted to flow only in one direction between said outputs when either of said first and fourth switches or said second and third switches are conducting, said means for coupling exhibiting series resonance at a given frequency when said secondary winding is coupled to a load; control means for biasing both said first and fourth switches for conduction, and both said second and third switches for conduction only during respective alternate periods of time having intervals between them, the sum of two periods and two intervals being greater than a period of said given frequency; and said control means biasing said third switch for conduction during intervals occurring immediately after the biasing of both said first and fourth switches for conduction ceases, and biasing said fourth switch for conduction during intervals occurring immediately after the biasing of both said second and third switches for conduction ceases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power supply comprising:
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a source of D.C. voltage having positive and negative outputs; first and second unilateral current conducting switches connected in series in the order named between said positive and negative outputs, respectively, said first and second switches meeting at a first junction; first and second unilateral current conducting devices respectively connected in anti-parallel with said first and second switches; third and fourth unilateral current conducting switches connected in series in the order named between said positive and negative outputs; third and fourth unilateral current conducting devices respectively connected in anti-parallel with said third and fourth switches; a transformer having primary and secondary windings; means for coupling said primary winding between said first and second junctions, whereby current is permitted to flow only in one direction between said outputs when either said first and fourth switches are conducting or said second and third switches are conducting, said means for coupling exhibiting series resonance at a given frequency; said first and fourth switches being a first diagonal pair of switches, and said second and third switches being a second diagonal pair of switches; and control means for biasing both of said first diagonal pair of switches for conduction during a first period of time, one of said second diagonal pair of switches for conduction during a succeeding interval of time and both of said second diagonal pair of switches for conduction during a period of time following said succeeding interval.
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10. A power supply comprising:
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a source of D.C. voltage having positive and negative outputs; first and second unilateral current conducting switches connected in series in the order named between said positive and negative outputs, respectively, said first and second switches meeting at a first junction; first and second unilateral current conducting devices respectively connected in anti-parallel with said first and second switches; third and fourth unilateral current conducting switches connected in series in the order named between said positive and negative outputs, said third and fourth switches meeting at a second junction; third and fourth unilateral current conducting devices respectively connected in anti-parallel with said third and fourth switches; a transformer having primary and secondary windings; means for coupling said primary winding between said first and second junctions so as to permit current to flow in said one direction between said outputs when either said first and fourth switches are conducting or said second and third switches are conducting, said means for coupling exhibiting series resonance at a given frequency; said first and fourth switches being a first diagonal pair of switches, and said second and third switches being a second diagonal pair of switches; and control means for biasing said first and second diagonal pairs of switches for conduction during respective alternate periods of time having intervals of time between them, and for biasing for conduction one of the diagonal pair of switches not biased for conduction during one period of the interval immediately following said one period of time.
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11. Apparatus comprising:
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a first source of uniformly spaced pulses having a given repetition frequency; a second source of uniformly spaced pulses having leading edges respectively occurring half way between the leading edges of the pulses from said first source; means for varying in the same way the times of occurrence of the trailing edges of pulses from said first and second sources, respectively; means for deriving a first series of respective pulses occurring between the trailing edges of consecutive pulses from said first and second sources; means for deriving a second series of pulses that are 180°
out of phase with said first series of pulses;means for deriving a third series of pulses respectively occurring between the leading edges of consecutive pulses from said first and second sources; means for deriving a fourth series of pulses that are 180°
out of phase with respect to said third series of pulses;a power supply having positive and negative outputs; first and second transistors connected in series with like polarity between said positive and negative outputs, said transistors meeting at a first junction and having control electrodes; third and fourth transistors connected in series with like polarity between said positive and negative outputs, said transistors meeting at a second junction and having control electrodes; diodes respectively connected in anti-parallel with each transistor; means for coupling said means for deriving said first, second, third, and fourth series of pulses to the control electrodes of said first, second, third, and fourth transistors, respectively; a transformer having primary and secondary windings; and means for coupling said primary winding between said first and second junctions, said means being such that series resonance is exhibited between said junctions at a frequency greater than said given frequency.
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Specification