Capacitive Full-Wave Circuit for LED Light Strings
First Claim
1. A capacitive full wave LED light string that is connected to an AC power sources having a first power lead and a second power lead comprising:
- an LED string module;
a first adapter comprising;
a first capacitor having a first lead connected to said first power lead of said AC power source and a second lead connected to a first end of said LED string module, said first capacitor having a capacitance that creates an impedance between said first power lead and said LED string module that is sufficient to limit current through said LED string module to prevent damage to said LED string module and cause a positive voltage to be applied to said LED string module whenever a voltage level on said first power lead exceeds a voltage level on said second power lead;
a first diode having a cathode connected to said first end of said LED string module and an anode connected to said second power lead;
a second adapter comprising;
a second capacitor having a first lead connected to said first power lead and a second lead connected to a second end of said LED string module, said second capacitor having a capacitance that creates an impedance between said first power lead and said LED string module that is sufficient to limit current through said LED string module to prevent damage to said LED string module and cause a positive voltage to be applied to said LED string module whenever said voltage level on said second power lead exceeds said voltage level on said first power lead;
a second diode having a cathode that is connected to said second power lead and an anode that is connected to said second end of said LED string module.
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Accused Products
Abstract
A capacitive full-wave circuit for LED light strings makes use of capacitors and diodes together to drive a LED string with full AC waves. Different from the conventional four-diode full-wave rectifying circuit, one embodiment of capacitive full-wave circuit includes two capacitors and two diodes. Because of the large imaginary impedance, the capacitors not only limit and the voltage and current through the LEDs, but also consume almost no electrical power. The electrical current-voltage performance can be further improved by introducing four resistors with a cost of some additional power consumption. A LED light string module with the capacitive full-wave circuit is also presented, with the capacitive full-wave circuit integrated inside of a front power plug and a back power socket.
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Citations
18 Claims
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1. A capacitive full wave LED light string that is connected to an AC power sources having a first power lead and a second power lead comprising:
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an LED string module; a first adapter comprising; a first capacitor having a first lead connected to said first power lead of said AC power source and a second lead connected to a first end of said LED string module, said first capacitor having a capacitance that creates an impedance between said first power lead and said LED string module that is sufficient to limit current through said LED string module to prevent damage to said LED string module and cause a positive voltage to be applied to said LED string module whenever a voltage level on said first power lead exceeds a voltage level on said second power lead; a first diode having a cathode connected to said first end of said LED string module and an anode connected to said second power lead; a second adapter comprising; a second capacitor having a first lead connected to said first power lead and a second lead connected to a second end of said LED string module, said second capacitor having a capacitance that creates an impedance between said first power lead and said LED string module that is sufficient to limit current through said LED string module to prevent damage to said LED string module and cause a positive voltage to be applied to said LED string module whenever said voltage level on said second power lead exceeds said voltage level on said first power lead; a second diode having a cathode that is connected to said second power lead and an anode that is connected to said second end of said LED string module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of full wave rectification of an AC power source for application to an LED light string module and minimizing power loss comprising:
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connecting a first lead of a first capacitor to a first power lead of said AC power source; connecting a second lead of said first capacitor to a first end of said LED string module; connecting an anode of said first diode to a second power lead of said AC power source; connecting a cathode of said first diode to said second lead of said first capacitor and said first end of said LED string module; connecting a first lead of a second capacitor to said first power lead of said AC power source; connecting a second lead of said second capacitor to an anode of a second diode and a second end of said LED light string module; connecting an anode of said second diode to said second power lead of said AC power source; selecting a capacitance for said first capacitor that creates an impedance between said first power lead and said LED light string module that is sufficient to limit current through said LED light string module to prevent damage to said LED light string module and cause a positive voltage to be applied to said LED light string module whenever a voltage level on said first power lead exceeds a voltage level on said second power lead; selecting a capacitance for said second capacitor that creates an impedance between said first power lead and said LED light string module that is sufficient to limit current through said LED light string module to prevent damage to said LED light string module and cause a positive voltage to be applied to said LED light string module whenever said voltage level on said second power lead exceeds said voltage level on said first power lead. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification