US 11,942,888 B2
Power tool
Jifeng Feng, Nanjing (CN); and Chao Xian, Nanjing (CN)
Assigned to Nanjing Chervon Industry Co., Ltd., Nanjing (CN)
Filed by Nanjing Chervon Industry Co., Ltd., Nanjing (CN)
Filed on Apr. 18, 2022, as Appl. No. 17/722,620.
Claims priority of application No. 202110495553.9 (CN), filed on May 7, 2021.
Prior Publication US 2022/0360209 A1, Nov. 10, 2022
Int. Cl. H02P 29/60 (2016.01); E01H 5/09 (2006.01)
CPC H02P 29/60 (2016.02) [E01H 5/098 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power tool, comprising:
a power interface configured to be connected to a power supply;
a motor;
a driver circuit having a plurality of switching elements for driving the motor;
a capacitor configured to filter out current spikes in the power supply;
a capacitor switch connected to the capacitor and configured to control a working state of the capacitor, the capacitor comprises a first capacitor and a second capacitor, the capacitor switch comprises a first switch, and the first switch is connected to the first capacitor and configured to control an on or off state of the first capacitor, the capacitor switch further comprises a second switch, the second switch is connected to the second capacitor and configured to control an on or off state of the second capacitor;
a temperature detection unit configured to detect a temperature of a related object; and
a controller electrically connected to the capacitor switch and configured to control an on or off state of the capacitor switch,
wherein the controller is configured to:
acquire the temperature of the related object;
control the capacitor switch to be in a first on or off state such that the capacitor works in a first working state when the temperature is lower than a temperature threshold;
control the capacitor switch to be in a second on or off state such that the capacitor works in a second working state when the temperature is higher than the temperature threshold;
control the first switch to be turned on such that the first capacitor is in a working state and control the second switch to be turned off such that the second capacitor is in a non-working state when the temperature is lower than the temperature threshold; and
control the first switch to be turned off such that the first capacitor is in a non-working state and control the second switch to be turned on such that the second capacitor is in a working state when the temperature is higher than the temperature threshold.