Control system for normally-on power tool

Patent metadata

Field	Value
Publication number	US-12296424-B2
Application number	US-202217679186-A
Country	US
Kind code	B2
Filing date	Feb 24, 2022
Priority date	Mar 3, 2021
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

Disclosed in the present invention is a control system for a normally-on power tool. The power tool comprises a tool head and a power device for providing the tool head with power, and the control system comprises an acquisition circuit and a control circuit. The acquisition circuit is in electrical communication with the power device and used to acquire at least one parameter associated with the power device, and the control circuit is configured to put the power device in a working mode with a first output power or a standby mode with a second output power according to the at least one parameter. The control system according to one or more embodiments of the present invention can save energy consumption, reduce mechanical wear, increase the service life of the power tool, and enhance operation convenience and safety.

First claim

The invention claimed is:

1. Control system for a normally-on power tool, the power tool comprising a tool head and a power device for providing the tool head with power, wherein the control system comprises:
an acquisition circuit configured to be in electrical communication with the power device and used to acquire at least one parameter associated with the power device; and
a control circuit configured to put the power device in a working mode with a first output power or a standby mode with a second output power according to the at least one parameter,
wherein the acquisition circuit is configured to continuously acquire the at least one parameter of the power device in the working mode, and intermittently acquire the at least one parameter of the power device in the standby mode.

2. Control system according to claim 1 , wherein the acquisition circuit comprises one or more of a current sensor, a voltage sensor, a power sensor, or a speed sensor, and the at least one parameter comprises one or more of a current, an output power, or a rotational speed of the power device.

3. Control system according to claim 1 , wherein, in the working mode, the power device has a current in a range of 8 A to 50 A, an output power in a range of 230 W to 1050 W, and a rotational speed in a range of 30 RPM to 45 RPM.

4. Control system according to claim 1 , wherein, in the standby mode, the power device has a current in a range of 2 A to 5 A, an output power in a range of 58 W to 144 W, and a rotational speed in a range of 15 RPM to 25 RPM.

5. Control system according to claim 1 , wherein the control system further comprises a timing circuit configured to monitor a time value associated with the at least one parameter, and the control circuit puts the power device in the working mode or the standby mode according to the at least one parameter and the time value.

6. Control system according to claim 1 , wherein the control system is configured to detect at least one state of the power tool that is different from the at least one parameter, and the control circuit is configured to switch the power tool from the standby mode to the working mode based on the at least one state.

7. Control system according to claim 1 , wherein the control system is configured to detect at least one state of the power tool, and the control circuit is configured to switch the power tool from the standby mode to the working mode based on the at least one state before the at least one parameter changes.

8. Control system according to claim 1 , wherein the control system further comprises a feed sensor configured to monitor whether a material enters a feed port of the power tool.

9. Control system according to claim 1 , wherein the control system further comprises a load indicator for indicating a load capacity of the power tool.

10. Control system according to claim 9 , wherein the control system is configured to cause the load indicator to indicate a low load capacity within a predetermined time when the power device starts to switch from the standby mode to the working mode, wherein the low load capacity is based on the current drawn by the power device.

11. Control system according to claim 9 , wherein the control system is configured to cause the load indicator to indicate a low load capacity within a predetermined time from detection of the at least one state of the power tool by the control system, wherein the low load capacity is based on the current drawn by the power device.

12. Control system according to claim 1 wherein,
the control system is configured to detect one or more of the following items of the tool head of the power tool: total number of operating revolutions, total operating mileage, or total operating time; and
the control circuit determines whether the tool head needs to be replaced according to the detection of the tool head of the power tool.

13. Control system according to claim 12 , wherein the control system further comprises an indication circuit configured to indicate the at least one state.

14. Control system according to claim 1 , wherein the power tool is a branch shredder.

15. Control system according to claim 13 , wherein the control system further comprises an alarm circuit configured to issue an alarm signal in one or more of the at least one state, wherein the alarm signal is a visual signal, a sound signal, or a combination of the two.

Assignees

• Techtronic Cordless Gp

Inventors

• Chung Koon For
• Wang yan jia

Classifications

• B27L11/02

  of wood shavings or the like · CPC title

• B02C25/00

  Control arrangements specially adapted for crushing or disintegrating · CPC title

• A01G3/002

  for comminuting plant waste · CPC title

• B25F1/00

  Combination or multi-purpose hand tools (associations of tools for different working operations with one portable power-drive means B25F3/00; {combined stapling and punching tools B25C5/0214}) · CPC title

• B23Q15/20 Primary

  before or after the tool acts upon the workpiece · CPC title