VIRTUAL PARAMETRIC HIGH SIDE MOSFET DRIVER
First Claim
Patent Images
1. A power converter comprising:
- a. an output transformer;
b. a resonant tank circuit coupled to the output transformer, comprising;
i. a first energy storing element;
ii. a primary switch for selectively charging a first energy storing element;
iii. a second energy storing element in parallel with the first energy storing element;
iv. an auxiliary switch for selectively coupling a third energy storing element with the first energy storing element; and
v. a first power source for providing power to the resonant tank circuit;
c. a comparator to detect a voltage across at least one of the energy storage elements; and
d. a driver to drive the auxiliary switch based on the output state of the comparator;
wherein the driver comprises a second power source for providing a power independent of the tank circuit.
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Abstract
A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The converter circuit comprises a primary and an auxiliary switch for selectively determining a resonant frequency. The auxiliary switch is enabled by a driver having an independent power source so as to allow as strong a driver as necessary to drive a large auxiliary switch.
10 Citations
33 Claims
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1. A power converter comprising:
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a. an output transformer; b. a resonant tank circuit coupled to the output transformer, comprising; i. a first energy storing element; ii. a primary switch for selectively charging a first energy storing element; iii. a second energy storing element in parallel with the first energy storing element; iv. an auxiliary switch for selectively coupling a third energy storing element with the first energy storing element; and v. a first power source for providing power to the resonant tank circuit; c. a comparator to detect a voltage across at least one of the energy storage elements; and d. a driver to drive the auxiliary switch based on the output state of the comparator;
wherein the driver comprises a second power source for providing a power independent of the tank circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15)
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- 14. The comparator of claim 14 wherein the pre-driver comprises a MOSFET.
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16. A power converter comprising:
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a. an output transformer; b. a first resonance capacitor coupled to the transformer to form a resonant circuit with a primary inductance of the output transformer; c. a primary switch for selectively charging the first resonance capacitor; d. a second resonance capacitor coupled to the output transformer; e. an auxiliary switch to form a resonant circuit with the primary inductance of the transformer; f. a comparator for determining an amount of charge on the first resonance capacitor; and g. a driver for selectively enabling and disabling the auxiliary switch according to an output state of the comparator, wherein the driver comprises an independent power supply.
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18. The comparator of claim 18 further comprising:
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a. a first diode for directing current to the pre driver from the capacitor; b. a second diode for limiting a reverse current to the at least one energy storage element; and c. a third diode for limiting a reverse current to the pre-driver. - View Dependent Claims (17, 19, 20, 21, 22, 23, 24, 25)
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26. A power converter comprising:
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a. a transformer; b. a primary switch; c. a first resonance capacitor coupled to the transformer to form a resonant circuit with a primary inductance of the transformer; d. a second resonance capacitor coupled to the transformer through an auxiliary switch to form a resonant circuit with the primary inductance of said transformer; and e. a comparator, wherein the comparator selectively enables a driver according to a switching cycle, wherein the driver drives the auxiliary switch.
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28. The power converter of claim 28 wherein the comparator comprises:
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a. a capacitor for receiving charge from the first resonant capacitor; and b. a pre-driver for receiving charge from the capacitor and driving the driver; - View Dependent Claims (27, 29, 30, 31, 32, 33)
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Specification