Power converter controller with analog controlled variable current circuit
First Claim
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1. A bleeder controller for controlling a magnitude of a variable current conducted by bleeder circuitry between input terminals of a device, wherein the magnitude of the variable current is controllable in response to a control signal, the bleeder controller comprising:
- a control signal output to be coupled to output the control signal to the bleeder circuitry;
an input current sense input to be coupled to receive an input current sense signal representative of a current input into the input terminals of the device;
an input voltage sense input to be coupled to receive an input voltage sense signal representative of a voltage across the input terminals of the device;
a dimming detector to classify, based on at least one of the input current sense signal and the input voltage sense signal, a present half line cycle to the device as a leading-edge-dimmed half line cycle; and
control signal circuitry to set the control signal that is output to the control signal output, the control signal circuitry comprising;
timer circuitry to define;
an initial time period after a leading edge of the leading-edge-dimmed half line cycle, anda subsequent time period after the initial time period, wherein the initial time period and the subsequent time period are both within the leading-edge-dimmed half line cycle; and
one or more amplifiers to compare the input current sense signal with a first current threshold during the initial time period and with a second current threshold during the subsequent time period, wherein the second current threshold is lower than the first current threshold, and wherein the control signal circuitry sets the control signal in response to results of the comparisons to maintain the current input into the input terminals above the first current threshold during the initial time period and above the second current threshold during the subsequent time period.
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Abstract
A bleeder controller for controlling a magnitude of a variable current conducted by bleeder circuitry between input terminals of a device is disclosed. The magnitude of the variable current is controllable in response to a control signal. The bleeder controller includes a dimming detector to classify a half line cycle as leading-edge-dimmed or a trailing-edge-dimmed in response to at least one of an input current sense signal and an input voltage sense signal.
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Citations
21 Claims
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1. A bleeder controller for controlling a magnitude of a variable current conducted by bleeder circuitry between input terminals of a device, wherein the magnitude of the variable current is controllable in response to a control signal, the bleeder controller comprising:
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a control signal output to be coupled to output the control signal to the bleeder circuitry; an input current sense input to be coupled to receive an input current sense signal representative of a current input into the input terminals of the device; an input voltage sense input to be coupled to receive an input voltage sense signal representative of a voltage across the input terminals of the device; a dimming detector to classify, based on at least one of the input current sense signal and the input voltage sense signal, a present half line cycle to the device as a leading-edge-dimmed half line cycle; and control signal circuitry to set the control signal that is output to the control signal output, the control signal circuitry comprising; timer circuitry to define; an initial time period after a leading edge of the leading-edge-dimmed half line cycle, and a subsequent time period after the initial time period, wherein the initial time period and the subsequent time period are both within the leading-edge-dimmed half line cycle; and one or more amplifiers to compare the input current sense signal with a first current threshold during the initial time period and with a second current threshold during the subsequent time period, wherein the second current threshold is lower than the first current threshold, and wherein the control signal circuitry sets the control signal in response to results of the comparisons to maintain the current input into the input terminals above the first current threshold during the initial time period and above the second current threshold during the subsequent time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A bleeder controller for controlling a magnitude of a variable current conducted by bleeder circuitry between input terminals of a device, wherein the magnitude of the variable current is controllable in response to a control signal, the bleeder controller comprising:
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a control signal output to be coupled to output the control signal to the bleeder circuitry; an input current sense input to be coupled to receive an input current sense signal representative of a current input into the input terminals of the device; an input voltage sense input to be coupled to receive an input voltage sense signal representative of an input voltage across the input terminals of the device; a dimming detector to classify, based on at least one of the input current sense signal and the input voltage sense signal, a half line cycle to the device as a trailing-edge-dimmed; and control signal circuitry to set the control signal, the control signal circuitry including a latch to latch the bleeder controller in a trailing-edge-dimming mode in response to a classification, by the dimming detector, of a number N consecutive half line cycles as trailing-edge-dimmed, wherein, in the trailing-edge-dimming mode, for input voltages greater than a voltage threshold, the control signal circuitry sets the control signal to maintain the current input into the input terminals above a current threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A bleeder controller for controlling the magnitude of a variable current conducted by bleeder circuitry between input terminals of a device, wherein the magnitude of the variable current is controllable in response to a control signal, the bleeder controller comprising:
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a control signal output to be coupled to output the control signal to the bleeder circuitry; an input current sense input to be coupled to receive an input current sense signal representative of a current input into the input terminals of the device; an input voltage sense input to be coupled to receive an input voltage sense signal representative of a voltage across the input terminals of the device; a dimming detector to classify, based on at least one of the input current sense signal and the input voltage sense signal, half line cycles to the device as dimmed; and control signal circuitry to set the control signal, the control signal circuitry to enter a dimming window in response to a classification, by the dimming detector, of a number K successive half line cycles as dimmed, wherein the dimming window has a duration of a number N half line cycles; wherein, within the dimming window for input voltages greater than a voltage threshold, the control signal circuitry sets the control signal to maintain the current input into the input terminals above a current threshold. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification