US 12,348,135 B2
Power circuit, driving circuit and method for providing driving voltage
Chun-Shih Huang, New Taipei (TW)
Assigned to Monolithic Power Systems, Inc., Kirkland, WA (US)
Filed by Monolithic Power Systems, Inc., Kirkland, WA (US)
Filed on Sep. 28, 2023, as Appl. No. 18/477,018.
Claims priority of application No. 111137913 (TW), filed on Oct. 5, 2022.
Prior Publication US 2024/0022241 A1, Jan. 18, 2024
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01); H02M 1/08 (2006.01); H02M 1/32 (2007.01); H02M 3/156 (2006.01); H03K 17/082 (2006.01); H03K 17/687 (2006.01)
CPC H02M 3/1566 (2021.05) [H02M 1/0038 (2021.05); H02M 1/08 (2013.01); H02M 1/32 (2013.01); H02M 3/158 (2013.01); H03K 17/0822 (2013.01); H03K 17/6871 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power circuit, comprising:
a first switch having a first terminal, a second terminal, and a control terminal, wherein the first terminal of the first switch is configured to receive an input voltage;
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, and the second terminal of the second switch is configured to be coupled to a ground; and
a driving circuit configured to receive a Pulse-Width Modulation (PWM) control signal, and to provide a first driving signal to the control terminal of the first switch and to provide a second driving signal to the control terminal of the second switch based on the PWM control signal, wherein the driving circuit is further configured to determine whether the PWM control signal is at a high impedance logic level; and
wherein when the PWM control signal is at a low logic level, the driving circuit is further configured to provide the second driving signal with a first level to the second switch to turn on the second switch; wherein when the PWM control signal is at a high logic level, the driving circuit is further configured to provide the second driving signal with a second level to the second switch to turn off the second switch; and wherein when the PWM control signal is at the high impedance logic level, a voltage of the second driving signal is regulated to make the second switch operate in a linear region.