Small form factor power supply
First Claim
Patent Images
1. A power supply circuit, the circuit comprising:
- a magnetic core;
first and second primary coals electromagnetically coupled to the core to induce magnetic flux in the core; and
a secondary coil electromagnetically coupled to the core to generate an electromotive force based upon the magnetic flux in the core, wherein the secondary coil is positioned relative to the primary coils such that the flux generated by the primary coils constructively interfere;
driving circuitry coupled to each of the primary coils to provide a separate driving signal to each primary coil and each driving signal having a phase a phase relationship existing between the driving signals;
a rectifier coupled to the secondary coil to provide a regulated DC signal anda feedback means coupled between the output of the rectifier and the driving circuitry to alter the phase relationship between the driving signals to regulate the DC signal.
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Abstract
A new, small form factor power supply is disclosed that provides a regulated DC power supply in a package that radiates relatively little heat and that occupies 2.75" by 4.5" by 0.75". The secondary coil of the transformer is positioned at the summing node of the flux of the primary coils and the phase of the drive signals provided to the secondary coils is regulated to control the current and voltage provided by the secondary circuit. Preferably, all circuit components are surface mount devices and the transformer cores are E block planar cores mounted on the printed circuit board.
70 Citations
12 Claims
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1. A power supply circuit, the circuit comprising:
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a magnetic core; first and second primary coals electromagnetically coupled to the core to induce magnetic flux in the core; and a secondary coil electromagnetically coupled to the core to generate an electromotive force based upon the magnetic flux in the core, wherein the secondary coil is positioned relative to the primary coils such that the flux generated by the primary coils constructively interfere; driving circuitry coupled to each of the primary coils to provide a separate driving signal to each primary coil and each driving signal having a phase a phase relationship existing between the driving signals; a rectifier coupled to the secondary coil to provide a regulated DC signal and a feedback means coupled between the output of the rectifier and the driving circuitry to alter the phase relationship between the driving signals to regulate the DC signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for providing a regulated power supply providing a regulated direct current output signal having at least one parameter at a predefined level, the method comprising:
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providing a first and second driving signal each having a phase, a controllable phase relationship existing between the signals; providing a first magnetic core with a plurality of primary coils magnetically coupled to the core to produce magnetic flux therein and at least a secondary coil magnetically coupled to the core such that the secondary coil is positioned at a point where the magnetic flux from the two primary coils constructively interfere so that the secondary coil has a current induced therein when the primary coils are driven; providing the direct current output signal based upon the current induced in the secondary coil, sensing at least one parameter of the output signal; providing a feedback signal based upon the sensed parameter; and altering the controllable phase relationship exists between the driving signals to keep the parameter of the output signal within a predetermine range of the level. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A power supply circuit, the circuit comprising:
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a magnetic core; first and second primary coils electromagnetically coupled to the core to induce magnetic flux in the core; and a secondary coil electromagnetically coupled to the core to generate an electromotive force based upon the magnetic flux in the core, wherein the secondary coil is positioned relative to the primary coils such that the flux generated by the primary coils destructively interfere; driving circuitry coupled to each of the primary coils to provide a separate driving signal to each primary coil and each driving signal having a phase, a phase relationship existing between the driving signals; a rectifier coupled to the secondary coil to provide a regulated DC signal; and a feedback means coupled between the output of the rectifier and the driving circuitry to alter the phase relationship between the driving signals to regulate the DC signal.
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Specification