Electronic power supply system
DCFirst Claim
1. The combination comprising:
- a main power source operable to provide an AC voltage at an output;
an inductor means and a capacitor means effectively series-connected across the output, the inductor means being resonant with the capacitor means at or near the frequency of the AC voltage;
load means effectively connected in parallel with the capacitor means, the load means requiring conditioning before being operable to effectively absorb power, the load means having an auxiliary input adapted to receive power operable to effect the required conditioning;
an auxiliary power source connected with the auxiliary input and operable to provide power thereto, thereby to effect the required conditioning; and
means operable to prevent the main power source from providing the AC voltage at the output until after the auxiliary power source has provided power to the auxiliary input for a pre-determined period of time.
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Abstract
With the AC voltage output from an inverter series-driving a high-Q parallel-loaded resonant L-C circuit, and with the parallel-connected load being of a type that needs to be conditioned before it will absorb power (as would be the case with loads such as magnetrons or fluorescent lamps), the inverter and/or the L-C circuit may be destructively overloaded during the time it takes for the load to become conditioned.
In a power-line-operated inverter-type power supply with such a high-Q parallel-loaded resonant L-C circuit series-connected across its output, subject invention provides for means to prevent such destructive overload. In this power supply, the unfiltered pulsed DC output of a full-wave power-line-supplied rectifier is applied to a pair of inverters: an auxiliary inverter for pre-conditioning the load, and a main inverter for powering the load. The auxiliary inverter starts operating immediately upon application of power from the power line, and therefore immediately starts the process of conditioning the load. The main inverter, however, is not started until after the load has become adequately conditioned, at which time the load will adequately load the series-resonant L-C circuit.
If at any time the main inverter is operating, but if the load is removed or otherwise fails to adequately load the L-C circuit, the main inverter is immediately disabled for a pre-determined period.
7 Citations
18 Claims
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1. The combination comprising:
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a main power source operable to provide an AC voltage at an output; an inductor means and a capacitor means effectively series-connected across the output, the inductor means being resonant with the capacitor means at or near the frequency of the AC voltage; load means effectively connected in parallel with the capacitor means, the load means requiring conditioning before being operable to effectively absorb power, the load means having an auxiliary input adapted to receive power operable to effect the required conditioning; an auxiliary power source connected with the auxiliary input and operable to provide power thereto, thereby to effect the required conditioning; and means operable to prevent the main power source from providing the AC voltage at the output until after the auxiliary power source has provided power to the auxiliary input for a pre-determined period of time.
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2. A power supply system comprising:
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source operable to provide an AC voltage at an output; L-C circuit resonant at or near the frequency of this AC voltage and effectively series-connected across the output; load requiring conditioning before being operable to effectively absorb power by way of a set of terminals connected with said L-C circuit, the load having an auxiliary input by which to effect the conditioning; conditioner connected with this auxiliary input and operable to effect the conditioning; and means to prevent the source from providing the AC voltage until after the conditioning has been effected. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. The combination of:
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a source operable to provide an AC voltage across an L-C series-circuit, this L-C series-circuit being substantially resonant at the frequency of the AC voltage and connected with a load means that requires pre-conditioning before being effective as a load for the L-C series-circuit; conditioner means coupled with said load means and operative to accomplish said pre-conditioning; and means to prevent the AC voltage from being provided across said L-C series-circuit until after said pre-conditioning has been accomplished. - View Dependent Claims (13)
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14. A power supply system comprising:
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rectifier means connected with an ordinary electric utility power line and operable to provide a DC voltage at a DC output; inverter means connected with said DC output and controllably operable to provide an AC voltage at an AC output; an L-C circuit resonant at or near the frequency of this AC voltage and effectively series-connected across this AC output; load means connected with the L-C circuit, said load means requiring conditioning before being operable to effectively load said L-C circuit and having an auxiliary input by which to accomplish said conditioning, said conditioning requiring a period of time before becoming effective; a conditioner means connected with this auxiliary input and operable to accomplish said conditioning; and means to prevent the inverter from providing the AC voltage until said conditioning has become effective.
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15. A power supply system comprising:
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rectifier means connected with an ordinary electric utility power line and operable to provide periodic DC voltage pulses at a DC output, these DC voltage pulses having a relatively low frequency and a pulse period; inverter connected with said DC output and controllably operable to provide an AC voltage at an AC output, said AC voltage having a relatively high frequency and a short period, this short period being substantially shorter than said pulse period; an L-C series-circuit resonant at or near said high frequency and connected across said AC output, this L-C series-circuit representing an effective short circuit for said AC output except when being connected with an effective load, said inverter and/or said L-C circuit being subject to destructive overload if said AC voltage is permitted to exist across said AC output for a time period substantially longer than said pulse period while the L-C circuit is not connected with an effective load; load means connected with the L-C circuit and conditionally operable to constitute an effective load therefor; and means operative within the approximate timespan of said pulse period to prevent the inverter from providing the AC voltage across said AC output if for some reason the load means should fail to constitute an effective load for said L-C circuit. - View Dependent Claims (16, 17, 18)
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Specification