Dc-dc converter with transient control and the method thereof
AssigneeMonolithic Power Systems, Inc.
InventorsChao Liu, Lijie Jiang, Qian Ouyang, Xiaokang Wu
Life of this patent
Estimating the term…
Abstract
A DC-DC converter with transient control. The DC-DC converter includes a power switching circuit, a current to voltage converter, a PI circuit 403, a voltage to current converter 404 and a logic and control circuit 405. The DC-DC converter obtains the transient information of a current flowing through the power switching circuit, to slow down the variation of the output voltage, so as to eliminate the overshot issue.
Claims14
A DC-DC converter, comprising:
- a power switching circuit, controlled to be periodically ON and OFF to convert an input voltage into an output voltage to power a load;
- a current to voltage converter, configured to convert a difference of a current sense signal and a current compensation signal into a voltage compensation signal, the current sense signal indicative of a current flowing through the power switching circuit;
- a proportional integral circuit, configured to integrate the voltage compensation signal to generate an integral signal;
- a voltage to current converter, configured to convert the integral signal into the current compensation signal;
- and
- a logic and control circuit, configured to generate a switching control signal PWM to control the power switching circuit in response to a sum of the voltage compensation signal and a differential voltage indicative of the output voltage.
A DC-DC converter, comprising:
- a power switching circuit, controlled to be periodically ON and OFF to convert an input voltage into an output voltage to power a load;
- a resistor, wherein a difference of a current sense signal and a current compensation signal flows through the resistor, and wherein the current sense signal is indicative of a current flowing through the power switching circuit;
- a proportional integral circuit, configured to integrate a voltage across the resistor to generate an integral signal;
- a voltage to current converter, configured to convert the integral signal into the current compensation signal;
- and
- a logic and control circuit, configured to receive a sum of a differential voltage indicative of the output voltage and the voltage across the resistor to generate a switching control signal to control the power switching circuit.
A method used in a DC-DC converter, the DC-DC converter including a power switching circuit configured to receive an input voltage and generate an output voltage to power a load, the method comprising:
- deriving a differential voltage indicative of the output voltage and a current sense signal indicative of a current flowing through the power switching circuit;
- detecting whether the DC-DC converter is in a steady state condition or in a transient state condition:
- generating a current compensation signal counteracted with the current sense signal, and controlling the power switching circuit in response to the differential voltage when the DC-DC converter is in the steady state condition;
- and
- adding the current sense signal to the differential voltage, and controlling the power switching circuit in response to a sum of the differential voltage and the current sense signal when the DC-DC converter is in the transient state condition.
Dependencies are inferred from the claim text.