CN-121987092-A - Vacuum cleaner sub-board

Abstract

One embodiment provides a vacuum cleaner daughter board that includes a sensor terminal and an electrostatic discharge protection circuit connected to the sensor terminal and configured to limit an electrostatic discharge current.

Inventors

• TAN ZICHEN
• Jonathan S. Pinsk

Assignees

• 米沃奇电动工具公司

Dates

Publication Date

20260508

Application Date

20251105

Priority Date

20241105

Claims (20)

1. 1. A power tool, comprising: sensor terminal, and An electrostatic discharge protection circuit connected to the sensor terminal and configured to limit an electrostatic discharge current.
2. 2. The power tool of claim 1, wherein the electrostatic discharge protection circuit is configured to deliver excess current to a ground connection.
3. 3. The power tool of any one of the preceding claims, further comprising a controller electrically connected to the sensor terminals via the electrostatic discharge protection circuit.
4. 4. The power tool of any one of the preceding claims, wherein the electrostatic discharge protection circuit is disposed on a circuit board.
5. 5. The power tool of any of the preceding claims, further comprising: A housing; a hose connected to the housing, and A motor configured to generate an airflow through the hose and provide suction to draw debris and fluid into the housing.
6. 6. The power tool of claim 2, further comprising a battery pack, wherein the ground connection is a negative battery reference.
7. 7. The power tool of claim 2, further comprising an AC power source, wherein the ground connection is a protective ground connection.
8. 8. The power tool of claim 2, further comprising: a battery pack including a negative battery reference, and An AC power source including a protective ground connection.
9. 9. The power tool of claim 8, wherein the electrostatic discharge protection circuit comprises a first current path configured to deliver the excess current to the negative battery reference and a second current path configured to deliver the excess current to the protective ground connection.
10. 10. The power tool of claim 9, wherein the electrostatic discharge protection circuit comprises a first capacitor and a first resistor configured to limit the excess current along the first current path, and a second capacitor and a second resistor configured to limit the excess current along the second current path.
11. 11. The power tool of claim 10, wherein the first capacitor and the first resistor are configured to sink transient current events of the excess current as the excess current is conveyed along the first current path.
12. 12. The power tool of claim 10, wherein the second capacitor and the second resistor are configured to sink transient current events of the excess current as the excess current is conveyed along the second current path.
13. 13. A power tool, comprising: A first circuit board configured to interface with a power supply having a negative connection or a ground connection; A second circuit board, the second circuit board comprising: sensor terminal, and An electrostatic discharge (ESD) protection circuit electrically connected to the sensor terminal, the ESD protection circuit configured to provide a current path to the negative connection or ground connection.
14. 14. The power tool of claim 13, wherein the sensor terminal comprises one or more water sensing probes configured to output a signal to the ESD protection circuit in response to detecting water.
15. 15. The power tool of claim 13, further comprising: a first capacitor and a first resistor electrically connected to the current path, the first capacitor and the first resistor configured to absorb transient current events.
16. 16. The power tool of claim 13, wherein the power source is a DC power source, the power tool further comprising: A DC motor control circuit disposed on the first circuit board, the DC motor control circuit configured to drive a motor using power received from the DC power source.
17. 17. The power tool of claim 13, wherein the power source is an AC power source, the power tool further comprising: An AC motor control circuit disposed on the first circuit board, the AC motor control circuit configured to drive a motor using power received from the AC power source.
18. 18. The power tool of claim 13, further comprising: a controller electrically disposed on the first circuit board, Wherein the second circuit board is configured to transmit signals from the sensor terminals to the controller through the ESD protection circuit, the ESD protection circuit configured to prevent excessive current from the sensor terminals from damaging the controller.
19. 19. An air moving device comprising: A housing; a motor within the housing and configured to generate an airflow, and A sensor terminal configured to detect water during operation of the motor; a circuit board including a controller communicatively coupled to the sensor terminals, and An ESD protection circuit electrically connected between the sensor terminal and the controller, the ESD protection circuit configured to limit an electrostatic discharge current between the sensor terminal and the controller.
20. 20. The air moving device of claim 19, wherein the ESD protection circuit is configured to deliver excess current to a ground connection.

Description

Vacuum cleaner sub-board RELATED APPLICATIONS The present application claims priority from U.S. provisional patent application No. 63/716,537 filed 11/5/2024, the entire contents of which are hereby incorporated by reference. Technical Field The invention relates to a daughter board with an electrostatic discharge circuit for a vacuum cleaner. Disclosure of Invention In some aspects, the present technology relates to a power tool including a sensor terminal and an electrostatic discharge protection circuit connected to the sensor terminal and configured to limit an electrostatic discharge current. In some aspects, the technology described herein relates to a power tool including a first circuit board configured to interface with a power source having a negative connection or a ground connection, a second circuit board including a sensor terminal, and an electrostatic discharge (ESD) protection circuit electrically connected to the sensor terminal, the ESD protection circuit configured to provide a current path to the negative connection or the ground connection. In some aspects, the technology described herein relates to an air moving device including a housing, a motor within the housing and configured to generate an air flow, and a sensor terminal configured to detect water during operation of the motor, a circuit board including a controller communicatively coupled to the sensor terminal, and an ESD protection circuit electrically connected between the sensor terminal and an electronic processor, the ESD protection circuit configured to limit an electrostatic discharge current between the sensor terminal and the controller. In some examples, the techniques described herein relate to a power tool including a sensor terminal and an electrostatic discharge limiting circuit connected to the sensor terminal and configured to limit an electrostatic discharge current. In some examples, the electrostatic discharge limiting circuit is configured to deliver excess current to the ground connection. In some examples, the power tool further includes an electronic processor electrically connected to the sensor terminals via the electrostatic discharge limiting circuit. In some examples, the electrostatic discharge limiting circuit is disposed on a circuit board. In an example, the power tool further includes a housing, a hose connected to the housing, and a motor configured to generate an airflow through the hose and provide suction to draw debris and fluid into the housing. In some examples, the power tool includes a battery pack, wherein the ground connection is a negative battery reference (negative battery reference). In some examples, the power tool further includes an AC power source, wherein the ground connection is a protective ground connection (protective earth ground connection). In some examples, the power tool further includes a battery pack including a negative battery reference and an AC power source including a protective ground connection. In some examples, the electrostatic discharge limiting circuit includes a first current path configured to deliver excess current to the negative battery reference and a second current path configured to deliver excess current from the sensor to the protective ground connection. In some examples, the electrostatic discharge limiting circuit includes a first capacitor and a first resistor configured to limit excess current along the first current path and a second capacitor and a second resistor configured to limit excess current along the second current path. In some examples, the first capacitor and the first resistor are configured to absorb transient current events of excess current as the excess current is conveyed along the first current path. In some examples, the second capacitor and the second resistor are configured to absorb transient current events of the excess current as the excess current is conveyed along the second current path. Drawings Fig. 1A and 1B are perspective views of a power tool according to some aspects. Fig. 2 is a functional block diagram of an arrangement of circuit boards in a power tool according to some aspects. Fig. 3 is a block diagram of a controller, power supply, and motor of a power tool according to some aspects. Fig. 4 is a circuit diagram of the circuit board of fig. 2, according to some aspects. Fig. 5 is a plan view of the circuit board of fig. 4, according to some aspects. Detailed Description Before any embodiments are explained in detail, it is to be understood that the embodiments are not limited in their application to the details of the construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The embodiments can be practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," or