POWER CONVERSION SYSTEM
An illumination device is provided. The illumination device includes a light emitting source, and a clamped series resonant converter operatively coupled to the light emitting source, where the clamped series resonant converter is configured to automatically regulate a load current generated by the clamped series resonant converter in response to a load voltage applied by the light emitting source.
1 . An illumination device comprising:
a light emitting source; and
a clamped series resonant converter electrically coupled to the light emitting source, wherein the clamped series resonant converter comprises an input and an output, and wherein the clamped series resonant converter is configured to receive a direct current (DC) power at the input and supply a fixed output DC power to the light emitting source via the output to automatically regulate a load current generated by the clamped series resonant converter in response to a load voltage applied by the light emitting source.
2 . The illumination device of claim 1 , wherein the light emitting source comprises a string of one or more light emitting diodes.
3 . The illumination device of claim 1 , further comprising an alternating current (AC) to DC power converter for converting AC power received from a power source to the DC power.
4 . (canceled)
5 . The illumination device of claim 1 , wherein the load voltage applied by the light emitting source is fixed and the clamped series resonant converter automatically regulates the load current to provide the fixed output DC power to the light emitting source.
6 . The illumination device of claim 5 , wherein the clamped series resonant converter automatically regulates the load current based on a switching frequency of the clamped series resonant converter, wherein the switching frequency comprises a predetermined fixed frequency.
7 . The illumination device of claim 1 , wherein the clamped series resonant converter comprises a magnetizing inductance induced by a transformer in the clamped series resonant converter when operatively coupled to the light emitting source.
8 . The illumination device of claim 7 , wherein the magnetizing inductance enables a zero voltage switching (ZVS) in the clamped series resonant converter.
9 . The illumination device of claim 1 , wherein the clamped series resonant converter operates in a zero voltage switching mode (ZVS) upon achieving a zero current switching (ZCS) boundary condition.
10 . The illumination device of claim 7 , wherein the clamped series resonant converter operates in a partial zero voltage switching mode or a full zero voltage switching mode.
11 . A method for regulating current in an illumination device comprising:
converting an alternating current (AC) power to a direct current (DC) power using an AC-DC power converter;
receiving the DC power at an input of a clamped series resonant converter from the AC-DC power converter; and
supplying a fixed output DC power to the light emitting source via an output of the clamped series resonant converter such that a load current flowing through the light emitting source is automatically regulated based solely on a fixed predetermined switching frequency of the clamped series resonant converter.
12 . (canceled)
13 . The method of claim 11 , further comprising operating the clamped series resonant converter at the fixed predetermined switching frequency for providing an automatic power factor correction to the DC power received from the AC-DC power converter for providing the fixed output DC power to the light emitting source.
14 . The method of claim 12 , wherein using the clamped series resonant converter for generating the load current in response to the load voltage comprises inducing a magnetizing inductance in the clamped series resonant converter for operating the clamped series resonant converter in a zero voltage switching (ZVS) mode.
15 . The method of claim 12 , wherein using the clamped series resonant converter for generating the load current in response to the load voltage comprises operating the clamped series resonant converter in a zero voltage switching mode (ZVS) upon achieving a zero current switching (ZCS) boundary condition.
16 . The method of claim 15 , further comprising operating the clamped series resonant converter in a partial zero voltage switching mode.
17 . (canceled)
18 . (canceled)
19 . The illumination device of claim 1 , wherein the clamped series resonant converter further comprises an inverter configured to generate an intermediate AC power, wherein the clamped series resonant converter comprises:
a plurality of switches coupled in series with each other; and
a plurality of diodes coupled in series with each other, wherein the plurality of switches is coupled in parallel with the plurality of diodes.
20 . The illumination device of claim 19 , wherein the clamped series resonant converter further comprises a transformer comprising a primary winding and a secondary winding, wherein the primary winding is electrically coupled to the inverter to receive the intermediate AC power.
21 . The illumination device of claim 20 , wherein the clamped series resonant converter further comprises a rectifier coupled to the secondary winding of the transformer to convert the intermediate AC power to the fixed output DC power.
22 . The illumination device of claim 20 , wherein the inverter further comprises:
a resonator inductor coupled to the plurality of the switches; and
a resonator capacitor coupled to the plurality of diodes to facilitate generation of the intermediate AC power, wherein the resonator inductor and the resonator capacitor are coupled to the primary winding of the transformer.