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US 9,867,240 B2Granted
Filter circuit
AssigneeNXP B.V.
InventorsLeendert van den Broeke, Tobias Doom
Life of this patent
Estimating the term…
Abstract
A filter circuit comprising a first feedback circuit configured to: receive a sensed-voltage-level-signal representative of a sensed voltage across a current sensing element; receive a voltage-set-point-signal; and set a regulation-control-signal for a current regulation device such that the sensed-voltage-level-signal tends towards the voltage-set-point-signal. The filter circuit also comprises a second feedback circuit configured to: receive a predetermined-threshold-signal; and receive a regulation-control-voltage-signal, representative of a voltage level of the regulation-control-signal. The second feedback circuit is configured to adjust the voltage-set-point-signal in accordance with a comparison between the regulation-control-voltage-signal and the predetermined-threshold-signal.
Claims17
A filter circuit comprising:
- a first input terminal;
- a reference terminal, wherein the filter circuit is configured to receive an input voltage waveform across the first input terminal and the reference terminal;
- a current regulation device;
- and
- a current sensing element,
- wherein:
- the current regulation device comprises a conduction channel and a control terminal, wherein the current regulation device is configured to regulate current flow through the conduction channel in accordance with a regulation-control-signal received at the current regulation device control terminal;
- and
- the current sensing element and the conduction channel of the current regulation device, are connected in series with each other between the first input terminal and the reference terminal;
- the filter circuit further comprising:
- a first feedback circuit configured to:
- receive a sensed-voltage-level-signal representative of a sensed voltage across the current sensing element;
- receive a voltage-set-point-signal;
- and
- set the regulation-control-signal such that the sensed-voltage-level-signal tends towards the voltage-set-point-signal;
- and
- a second feedback circuit configured to:
- receive a predetermined-threshold-signal;
- receive a regulation-control-voltage-signal, representative of a voltage level of the regulation-control-signal;
- and
- adjust the voltage-set-point-signal in accordance with a comparison between the regulation-control-voltage-signal and the predetermined-threshold-signal.
18 more elements
A power converter circuit comprising:
- the filter circuit of any preceding claim;
- an LED load;
- and
- a PFC circuit;
- wherein a terminal of the LED load is connected to either the first input terminal or the reference terminal of the filter circuit, and wherein the LED load and the filter circuit are together connected in series across an output of the PFC circuit.
2 more elements
A filter circuit comprising:
- a first input terminal;
- a reference terminal, wherein the filter circuit is configured to receive an input voltage waveform across the first input terminal and the reference terminal;
- a current regulation device;
- and
- a current sensing element,
- wherein:
- the current regulation device comprises a conduction channel and a control terminal, wherein the current regulation device is configured to regulate current flow through the conduction channel in accordance with a regulation-control-signal received at the current regulation device control terminal;
- and
- the current sensing element and the conduction channel of the current regulation device, are connected in series with each other between the first input terminal and the reference terminal;
- the filter circuit further comprising:
- a first feedback circuit configured to:
- receive a sensed-voltage-level-signal representative of a sensed voltage across the current sensing element;
- receive a voltage-set-point-signal;
- and
- set the regulation-control-signal such that the sensed-voltage-level-signal tends towards the voltage-set-point-signal;
- and
- a second feedback circuit configured to:
- receive a predetermined-threshold-signal;
- receive a regulation-control-voltage-signal, representative of a voltage level of the regulation-control-signal;
- and
- adjust the voltage-set-point-signal in accordance with a comparison between the regulation-control-voltage-signal and the predetermined-threshold-signal;
- and
- wherein the second feedback circuit is configured to reduce the voltage-set-point-signal if the regulation-control-voltage-signal exceeds the predetermined-threshold-signal, and otherwise increase the voltage-set-point-signal.
20 more elements
A filter circuit comprising:
- a first input terminal;
- a reference terminal, wherein the filter circuit is configured to receive an input voltage waveform across the first input terminal and the reference terminal;
- a current regulation device;
- and
- a current sensing element,
- wherein:
- the current regulation device comprises a conduction channel and a control terminal, wherein the current regulation device is configured to regulate current flow through the conduction channel in accordance with a regulation-control-signal received at the current regulation device control terminal;
- and
- the current sensing element and the conduction channel of the current regulation device, are connected in series with each other between the first input terminal and the reference terminal;
- the filter circuit further comprising:
- a first feedback circuit configured to:
- receive a sensed-voltage-level-signal representative of a sensed voltage across the current sensing element;
- receive a voltage-set-point-signal;
- and
- set the regulation-control-signal such that the sensed-voltage-level-signal tends towards the voltage-set-point-signal;
- and
- a second feedback circuit configured to:
- receive a predetermined-threshold-signal;
- receive a regulation-control-voltage-signal, representative of a voltage level of the regulation-control-signal;
- and
- adjust the voltage-set-point-signal in accordance with a comparison between the regulation-control-voltage-signal and the predetermined-threshold-signal;
- and
- wherein the first feedback circuit comprises:
- an error-amplifier comprising an error-amplifier-first-input-terminal, an error-amplifier-second-input-terminal and an error-amplifier-output-terminal, wherein:
- the error-amplifier-first-input-terminal is connected to the conduction channel of the current regulation device or the current sensing element in order to receive the sensed-voltage-level-signal;
- the error-amplifier-second-input-terminal is connected to the second feedback circuit in order to receive the voltage-set-point-signal;
- and
- the error-amplifier-output-terminal is connected to the control terminal of the current regulation device.
25 more elements
Dependencies are inferred from the claim text.