Switch control circuit and power converter comprising the same
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorsYuedong Chen, Junlin Qian
Life of this patent
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Abstract
A power converter includes a switch control circuit for driving a high side switch of the power converter comprising the high side switch and a low side switch connected in series. The switch control circuit may have a first terminal for receiving an input signal, a second terminal used as a reference ground terminal of the switch control circuit, and a third terminal used as an output terminal to provide a driving signal, the switch control circuit can draw power from the input signal and may be configured to control a logic state of the driving signal based on a logic state of the input signal relative to a reference ground signal at the second terminal or based on a current flowing through the first terminal.
Claims20
A switch control circuit, comprising:
- a first terminal, configured as an input terminal of the switch control circuit to receive an input signal;
- a second terminal, configured as a reference ground terminal of the switch control circuit and being operable to be coupled to a common connection of a first power switch and a second power switch when the switch control circuit is used in a power converter;
- and
- a third terminal, configured as an output terminal of the switch control circuit to provide a driving signal adapted to be configured to drive the first power switch to perform on and off switching;
- wherein
- the switch control circuit is configured to draw power from the input signal received at the first terminal, and further configured to detect whether the second power switch is ON or OFF when being used in the power converter and to control a logic state of the driving signal based on a logic state of the input signal relative to a reference ground signal at the second terminal or based on whether a current flowing through the first terminal is larger than a predetermined current value.
A power converter comprising:
- a first switch having a first terminal, a second terminal and a control terminal, wherein the first terminal of the first switch is coupled to an input terminal of the power converter;
- a second switch having a first terminal, a second terminal and a control terminal, wherein the first terminal of the second switch is coupled to the second terminal of the first switch to form a common connection, and wherein the second terminal of the second switch is coupled to a reference ground of the power converter;
- and
- a first switch control circuit having a first terminal configured to receive an input signal, a second terminal coupled to the common connection, and a third terminal coupled to the control terminal of the first switch, wherein the first switch control circuit is configured to draw power from the input signal and to detect whether the second switch is ON or OFF based on a logic state of the input signal relative to a reference ground signal at its second terminal or based on whether a current flowing through its first terminal is larger than a predetermined current value.
Dependencies are inferred from the claim text.