Electronic device that removes acoustic noise based on frequency booster
An electronic device includes: a switching regulator configured to generate a conversion voltage with respect to an input voltage, based on a switching signal of a first frequency, and output the conversion voltage; a stabilization circuit including a capacitor element connected to a load device via a first node and configured to generate a load voltage by stabilizing the conversion voltage by using the capacitor element and output the load voltage to the load device; a frequency sensing circuit configured to sense a frequency of the load voltage and output sensing information about the frequency of the load voltage; and a frequency booster circuit configured to form a first current path connected to the first node, based on the sensing information.
1. An electronic device comprising:
a switching regulator configured to generate a conversion voltage with respect to an input voltage, based on a switching signal of a first frequency, and output the conversion voltage;
a stabilization circuit comprising a capacitor element connected to a load device via a first node and configured to generate a load voltage, by stabilizing the conversion voltage using the capacitor element, and output the load voltage to the load device;
a frequency sensing circuit configured to sense a frequency of the load voltage and output sensing information about the frequency of the load voltage; and
a frequency booster circuit configured to form a first current path connected to the first node based on the sensing information.
2. The electronic device of claim 1 , wherein the frequency booster circuit comprises a resistive element connected to the first node and a frequency booster switch connected to the resistive element.
3. The electronic device of claim 2 , wherein turning-on or turning-off the frequency booster switch is controlled based on the sensing information to control a current of the first current path such that a natural frequency of the capacitor element is different from the frequency of the load voltage.
4. The electronic device of claim 3 , further comprising a frequency controller that turns on the frequency booster switch if a frequency of the load voltage is within an audio frequency band.
5. The electronic device of claim 1 , wherein the switching regulator further comprises a switching controller receiving a feedback voltage based on the load voltage and outputting the switching signal based on the feedback voltage.
6. The electronic device of claim 5 , wherein the switching controller outputs the switching signal by varying the first frequency according to a current of the first current path.
7. The electronic device of claim 5 , wherein the switching controller outputs a pulse signal of the first frequency as the switching signal based on a pulse frequency modulation (PFM) method.
8. The electronic device of claim 5 , wherein the stabilization circuit further comprises an inductor having a first end connected to the switching regulator and a second end connected to the capacitor element.
9. The electronic device of claim 1 , wherein the capacitor element comprises a multilayer ceramic capacitor.
10. The electronic device of claim 9 , further comprising a measurement device configured to measure whether acoustic noise of the multilayer ceramic capacitor has occurred and output an enable signal to the frequency sensing circuit based on a result of the measurement.
11. The electronic device of claim 10 , wherein the frequency sensing circuit senses a frequency of the load voltage according to the enable signal.
12. The electronic device of claim 1 , wherein the frequency booster circuit additionally forms a second current path connected to the first node, based on the sensing information.
13. An electronic device comprising:
a voltage regulator comprising a first terminal and a second terminal and configured to generate a switching signal, having a frequency that is variable based on a feedback voltage received via the second terminal, and an output voltage based on an input voltage;
a stabilization circuit that is connected to the first terminal, comprises a multilayer ceramic capacitor, and is configured to output a load voltage to a first node by charging or discharging the output voltage to or from the multilayer ceramic capacitor; and
a frequency booster circuit that is connected to the first node and comprises a frequency booster switch, wherein turning-on or turning-off the frequency booster switch is controlled based on a frequency of the load voltage.
14. The electronic device of claim 13 , further comprising:
a frequency sensing circuit configured to sense a frequency of the load voltage and output frequency sensing information; and
a frequency controller configured to output a booster control signal used to control turning-on or turning-off the frequency booster switch based on the frequency sensing information.
15. The electronic device of claim 14 , wherein the frequency controller outputs the booster control signal, based on the frequency sensing information, to turn on the frequency booster switch if a frequency of the load voltage and a natural frequency of the multilayer ceramic capacitor resonate with each other.
16. The electronic device of claim 14 , wherein the frequency controller comprises a one-time programmable (OTP) memory storing a setting value for generating the booster control signal based on the frequency sensing information.
17. The electronic device of claim 13 , further comprising:
a first resistor having a first end connected to the first node and a second end connected to the second terminal; and
a second resistor having a first end connected to the second terminal and a second end connected to ground, wherein
the feedback voltage is formed by distributing the load voltage based on the first and second resistors.
18. The electronic device of claim 13 , wherein the voltage regulator further comprises a pulse frequency modulation (PFM) controller outputting a pulse signal as the switching signal based on the feedback voltage, based on a PFM method.
19. The electronic device of claim 18 , wherein the PFM controller increases a frequency of the switching signal as the frequency booster switch is turned on.
20. An electronic device comprising:
a load device connected to a first node;
a voltage regulator configured to generate a switching signal and generate an output voltage based on the switching signal and an input voltage;
a multilayer ceramic capacitor having a first end connected to the first node, the multilayer ceramic capacitor being configured to generate a load voltage by being charged or discharged based on the output voltage;
a frequency controller configured to output a booster control signal based on a frequency of the load voltage; and
a frequency booster circuit connected to the first node and configured to form a first current path connected to the first node, based on the booster control signal.