Low trickle current startup bias circuit and method of operation thereof
First Claim
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1. For use with a power converter couplable to a load, a current startup bias circuit, comprising:
- a charge reservoir that receives and stores a trickle current during a startup period of said power converter, a voltage of said charge reservoir increasing as said charge reservoir stores said trickle current; and
a latch, coupled to said charge reservoir, that activates when said voltage reaches a threshold to couple said charge reservoir to said load and initiate operation thereof.
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Abstract
For use with a power converter having a power supply control circuit, a current startup bias circuit and a method of operating the same. In one embodiment, the circuit includes: (1) a charge reservoir that receives and stores a trickle current during a startup period of the power converter, a voltage of the charge reservoir increasing as the charge reservoir stores the trickle current and (2) a latch, coupled to the charge reservoir, that activates when the voltage reaches a threshold to couple the charge reservoir to the power supply control circuit and initiate operation thereof.
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Citations
22 Claims
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1. For use with a power converter couplable to a load, a current startup bias circuit, comprising:
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a charge reservoir that receives and stores a trickle current during a startup period of said power converter, a voltage of said charge reservoir increasing as said charge reservoir stores said trickle current; and a latch, coupled to said charge reservoir, that activates when said voltage reaches a threshold to couple said charge reservoir to said load and initiate operation thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a current startup bias circuit to start a power converter couplable to a load, comprising:
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storing a trickle current in a charge reservoir during a startup period of said power converter, a voltage of said charge reservoir increasing as said charge reservoir stores said trickle current; and coupling said charge reservoir to said load to initiate operation thereof when said voltage reaches a threshold. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A power converter, comprising:
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a power train having a controllable switch; a power supply control circuit coupled to said controllable switch to provide a drive waveform thereto; and a current startup bias circuit coupled to said power supply control circuit and including; a charge reservoir that receives and stores a trickle current during a startup period of said power converter, a voltage of said charge reservoir increasing as said charge reservoir stores said trickle current, and a latch, coupled to said charge reservoir, that activates when said voltage reaches a threshold to couple said charge reservoir to said power supply control circuit and initiate operation thereof. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification