Voltage-based auto-correction of switching time
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorsSiavash Yazdi, Faisal Hussien
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Abstract
A control device for a switching voltage regulator having a high-side switch and a low-side switch to supply a switching voltage to a load includes a comparator configured to compare the switching voltage with a reference voltage to provide an enable signal to the low-side switch, and a spike detection circuit configured to receive the switching voltage and output an offset control signal to execute a time shift to the enable signal.
Claims20
A control device for a switching voltage regulator having a switching module to supply a switching voltage to a load, the control device comprising:
- a comparator configured to compare the switching voltage with a reference voltage to provide a disable signal to the switching module;
- and
- a spike detection circuit configured to receive the switching voltage and output an offset control signal to execute a time shift to the disable signal,
- wherein the spike detection circuit comprises a first input coupled to the switching voltage, a second input coupled to a threshold voltage, and an output for providing the offset control signal to the comparator.
A switching regulator comprising:
- a controller for providing a first driver signal and a second driver signal;
- a dead-time control circuit comprising a first input terminal connected to the first driver signal, a second input terminal connected to the second driver signal, a first output terminal, and a second output terminal;
- a switching module coupled to the first and second out terminals and configured to supply a switching voltage to an LC network;
- and
- a spike detection circuit configured to receive the switching voltage and provide a control signal to the dead-time control circuit.
A method for controlling a dead time of a switching regulator comprising a switching module and a controller providing first and second driver signals to the switching module, the method comprising:
- providing a dead-time control circuit between the controller and the switching module and a spike detection circuit between the switching module and the dead-time control circuit;
- monitoring a switching voltage at an output terminal of the switching module by the spike detection circuit;
- determining whether the switching voltage exceeds a threshold voltage;
- and
- if the switching voltage exceeds the threshold voltage, generating a control signal to the dead-time control circuit to adjust a dead time between the first driver signal and the second driver signal;
- and
- if the switching voltage does not exceed the threshold voltage, maintaining the dead time between the first driver signal and the second driver signal.
Dependencies are inferred from the claim text.