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US 11,121,626 B2Granted
Switching frequency control apparatus and control method thereof
AssigneeM3 Technology Inc.
InventorsXiaoyu Xi, Bo Yang, Lou Nuo
Life of this patent
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Abstract
A switch frequency control apparatus comprises a timer configured to receive a ramp and a threshold voltage, and generate a control signal for setting gate drive signals of a power converter, a ramp generator configured to generate the ramp through charging a ramp capacitor using a current source having a current level equal to a bias voltage divided by a resistor, and a threshold generator configured to generate the threshold voltage proportional to the bias voltage.
Claims20
An apparatus comprising:
- a timer configured to receive a ramp and a threshold voltage, and generate a control signal for setting gate drive signals of a power converter;
- a ramp generator configured to generate the ramp through charging a ramp capacitor using a current source having a current level equal to a bias voltage divided by a resistor, wherein the bias voltage is a substantially constant voltage;
- and
- a threshold generator configured to generate the threshold voltage proportional to the bias voltage, wherein in determining a switching period of the power converter, the bias voltage for generating the ramp and the bias voltage for generating the threshold voltage cancel each other out, thereby maintaining the switching period of the power converter constant.
1 more element
A converter comprising:
- a high-side switch and a low-side switch connected in series between an input terminal of a power converter and ground;
- an inductor connected to a common node of the high-side switch and the low-side switch, and an output terminal of the power converter;
- and
- a control apparatus configured to generate gate drive signals for the high-side switch and the low-side switch, wherein the control apparatus comprises a timer configured to receive a ramp generated by charging a ramp capacitor through a current source and a threshold voltage, and generate a control signal for setting a turn-on time of the high-side switch based on a comparison between the ramp and the threshold voltage, wherein both a current level of the current source and the threshold voltage are proportional to a bias voltage of the power converter, and wherein the bias voltage of the power converter is a substantially constant voltage, and wherein as a result of having both the current level of the current source and the threshold voltage proportional to the bias voltage, the a switching period of the power converter is maintained constant.
1 more element
A converter comprising:
- a high-side switch and a low-side switch connected in series between an output terminal of a power converter and ground;
- an inductor connected to an input terminal of the power converter, and a common node of the high-side switch and the low-side switch;
- and
- a control apparatus configured to generate gate drive signals for the high-side switch and the low-side switch, wherein the control apparatus comprises a timer configured to receive a ramp generated by charging a ramp capacitor through a current source and a threshold voltage, and generate a control signal for setting a turn-off time of the low-side switch based on a comparison between the ramp and the threshold voltage, wherein both a current level of the current source and the threshold voltage are proportional to a bias voltage of the power converter, wherein the bias voltage of the power converter is a substantially constant voltage, and wherein in determining a switching period of the power converter, the bias voltage for generating the ramp and the bias voltage for generating the threshold voltage cancel each other out, and as a result of eliminating the bias voltage as a variable in determining the switching period of the power converter, the switching period of the power converter is maintained constant.
1 more element
Dependencies are inferred from the claim text.