Receive circuit for use in a power converter
First Claim
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1. A receive circuit for use in a power converter controller, comprising:
- a first amplifier coupled to receive an input pulse;
a second amplifier coupled to a first output of the first amplifier, wherein the first output is coupled to be responsive to the input pulse and to a second output of the second amplifier;
an output circuit coupled to generate an output signal in response to the second output;
a first pre-bias circuit coupled to reset the first output to a first value in response to the output signal;
a second pre-bias circuit coupled to reset the second output to a second value in response to the output signal; and
a delay circuit coupled to receive the output signal, wherein the delay circuit is coupled to generate a pre-bias control signal responsive to the output signal, and wherein the delay circuit is coupled to the first pre-bias circuit and the second pre-bias circuit, wherein the delay circuit is coupled to generate a pulse of the pre-bias control signal that is delayed from a corresponding pulse of the output signal by at least a pulse width of the input pulse.
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Abstract
A receive circuit for use in a power converter controller includes a first amplifier coupled to receive an input pulse. A second amplifier is coupled to a first output of the first amplifier. The first output is coupled to be responsive to the input pulse and to a second output of the second amplifier. An output circuit is coupled to generate an output signal in response to the second output.
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Citations
18 Claims
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1. A receive circuit for use in a power converter controller, comprising:
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a first amplifier coupled to receive an input pulse; a second amplifier coupled to a first output of the first amplifier, wherein the first output is coupled to be responsive to the input pulse and to a second output of the second amplifier; an output circuit coupled to generate an output signal in response to the second output; a first pre-bias circuit coupled to reset the first output to a first value in response to the output signal; a second pre-bias circuit coupled to reset the second output to a second value in response to the output signal; and a delay circuit coupled to receive the output signal, wherein the delay circuit is coupled to generate a pre-bias control signal responsive to the output signal, and wherein the delay circuit is coupled to the first pre-bias circuit and the second pre-bias circuit, wherein the delay circuit is coupled to generate a pulse of the pre-bias control signal that is delayed from a corresponding pulse of the output signal by at least a pulse width of the input pulse. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power converter, comprising:
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an energy transfer element; a switch coupled to the energy transfer element and coupled to an input of the power converter; and a controller circuit coupled to control switching of the switch to control a transfer of energy through the energy transfer element from the input of the power converter to an output of the power converter, the controller circuit including a receive circuit including; a first amplifier coupled to receive an input pulse; a second amplifier coupled to a first output of the first amplifier, wherein the first output is coupled to be responsive to the input pulse and to a second output of the second amplifier, wherein the second amplifier includes a second amplifier switch coupled to be controlled by the first output of the first amplifier, and wherein, in the absence of the input pulse in the receiver circuit, a first value of the first output is just below a turn-on value of the second amplifier switch; and an output circuit coupled to generate an output signal in response to the second output. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification