Voltage detection circuit, switching converter and integrated circuit
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsJiabin Chen, Hongxing Wang
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Abstract
A voltage detection circuit for a switching converter having a switch and a magnetic element connected in series, where a first terminal of the switch and a first terminal of the magnetic element are connected to a common node, the voltage detection circuit including: an average circuit configured to receive a first voltage across the switch, and to generate a second voltage representing an average value of the first voltage; and where the second voltage represents a voltage between a second terminal of the switch and a second terminal of the magnetic element in a steady state of the switching converter.
Claims19
A voltage detection circuit for a switching converter having a switch and a magnetic element connected in series, wherein a first terminal of the switch and a first terminal of the magnetic element are connected to a common node, the voltage detection circuit comprising:
- a) a low-pass filter configured to receive a first voltage across the switch, and to generate a second voltage representing an average value of the first voltage;
- b) wherein the second voltage represents a voltage between a second terminal of the switch and a second terminal of the magnetic element in a steady state of the switching converter;
- and
- c) wherein the switching converter is configured as a Boost converter, the switch is connected between the common node and a negative input terminal of the switching converter, the magnetic element is connected to a positive input terminal of the switching converter and the common node, and the second voltage represents an input voltage of the switching converter.
A voltage detection circuit for a switching converter having a switch and a magnetic element connected in series, wherein a first terminal of the switch and a first terminal of the magnetic element are connected to a common node, the voltage detection circuit comprising:
- a) a low-pass filter configured to receive a first voltage across the switch, and to generate a second voltage representing an average value of the first voltage;
- b) wherein the second voltage represents a voltage between a second terminal of the switch and a second terminal of the magnetic element in a steady state of the switching converter;
- and
- c) wherein the switching converter is configured as a Buck converter, the switch is connected between the common node and a positive input terminal of the switching converter, the magnetic element is connected to a positive output terminal of the switching converter and the common node, and the second voltage represents a difference between an input voltage and an output voltage of the switching converter.
A voltage detection circuit for a switching converter having a switch and a magnetic element connected in series, wherein a first terminal of the switch and a first terminal of the magnetic element are connected to a common node, the voltage detection circuit comprising:
- a) a low-pass filter configured to receive a first voltage across the switch, and to generate a second voltage representing an average value of the first voltage;
- b) wherein the second voltage represents a voltage between a second terminal of the switch and a second terminal of the magnetic element in a steady state of the switching converter;
- and
- c) wherein the switching converter is configured as a Buck converter, the switch is connected between the common node and a negative input terminal of the switching converter, the magnetic element is connected to a negative output terminal of the switching converter and the common node, and the second voltage represents a difference between an input voltage and an output voltage of the switching converter.
A voltage detection circuit for a switching converter having a switch and a magnetic element connected in series, wherein a first terminal of the switch and a first terminal of the magnetic element are connected to a common node, the voltage detection circuit comprising:
- a) a low-pass filter configured to receive a first voltage across the switch, and to generate a second voltage representing an average value of the first voltage;
- b) wherein the second voltage represents a voltage between a second terminal of the switch and a second terminal of the magnetic element in a steady state of the switching converter;
- and
- c) wherein the switching converter is configured as a Buck-Boost converter, the switch is connected between the common node and a positive input terminal of the switching converter, the magnetic element is connected to a negative output terminal of the switching converter and the common node, and the second voltage represents an input voltage of the switching converter.
A voltage detection circuit for a switching converter having a switch and a magnetic element connected in series, wherein a first terminal of the switch and a first terminal of the magnetic element are connected to a common node, the voltage detection circuit comprising:
- a) a low-pass filter configured to receive a first voltage across the switch, and to generate a second voltage representing an average value of the first voltage;
- b) wherein the second voltage represents a voltage between a second terminal of the switch and a second terminal of the magnetic element in a steady state of the switching converter;
- c) wherein the switching converter is configured as a Flyback converter;
- d) wherein when the low-pass filter is used to detect a voltage across the switch at a primary side, the second voltage is used to represent an input voltage of the switching converter, and
- e) wherein when the low-pass filter is used to detect a voltage across the switch at a secondary side, the second voltage is used to represent an output voltage of the switching converter.
Dependencies are inferred from the claim text.