# US 10,483,884 B2 · Electric tool control circuit

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- Number: US 10,483,884 B2
- Document ID: US10483884B2
- Status: Granted
- Kind: B2
- Application number: 15/531,043
- Filed: 2015-11-18
- Published: 2018-11-01
- Granted: 2019-11-19
- Earliest claimed: 2014-11-27
- Assignees: Suzhou Cleva Electric Appliance Co., Ltd.
- Applicants: Suzhou Cleva Electric Appliance Co., Ltd.
- Inventors: Fufei Wu
- Web page: https://patentgrep.com/patent/US10483884B2

## CPC

- H02P 7/285: controlling armature supply only
- H02P 3/12: by short-circuit or resistive braking
- H02P 7/28: using semiconductor devices
- H02P 29/032: Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
- H02P 29/02: Providing protection against overload without automatic interruption of supply (protection against faults of stepper motors H02P8/36)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

An electric tool control circuit includes a central control module, a motor drive module, a motor, and a working parameter detection module. The working parameter detection module is separately electrically connected to the motor and the central control module, and the working parameter detection module can return a parameter that is detected when the motor works to the central control module. The motor drive module is separately electrically connected to the motor by using first and second switch modules, and the motor drive module controls the first and second modules to be discontinuously on and off. The features of first switch module and the second switch module being on and off are always contrary, that is, when a first switch is on, a second switch is off, and when the first switch is off, the second switch is on.

## Claims

### Claim 1

An electric tool control circuit comprising:
a central control module, a motor, a motor drive module, a working parameter detection module, a first switch module and a second switch module;
the central control module being electrically connected to the motor drive module, and the central control module controlling turn on and off of the motor drive module;
a protection module which can prevent a motor peripheral circuit from being damaged by motor clutter produced during running of the motor; and
the working parameter detection module being electrically connected to the motor and the central control module, and the working parameter detection module returning a parameter that is detected during running of the motor to the central control module, wherein the motor drive module is electrically connected to the motor by a first switch module and a second switch module, and the motor drive module controls the first and second switch modules to be discontinuously on and off, the respective statuses of the first switch module and the second switch module being on and off are always contrary so that when the first switch module is on, the second switch module is off, and when the first switch module is off, the second switch module is on, the working parameter detection module having a current detection module which has a detection time inversely proportional to a magnitude of current value detected when the motor is loaded and increases its rotation speed.

### Claim 2 (depends on 1)

The electric tool control circuit according to claim 1, wherein the protection module having a spike absorption module and a follow current module, which respectively form a circuit loop with the motor, the spike absorption module including a first spike absorption module and a second spike absorption module.

### Claim 3 (depends on 2)

The electric tool control circuit according to claim 2, wherein the first spike absorption module is a capacitor, the second spike absorption module is a schottky diode, and the follow current module is a diode.

### Claim 4 (depends on 2)

The electric tool control circuit according to claim 2, wherein the first spike absorption module includes a resistor and a capacitor connected in series.

### Claim 5 (depends on 1)

The electric tool control circuit according to claim 1, wherein the first and second switch modules, the motor drive module and the motor are electrically connected to form a half-bridge driving circuit.

### Claim 6 (depends on 5)

The electric tool control circuit according to claim 5, wherein field effect transistors are used as the first and second switch modules.

### Claim 7 (depends on 1)

The electric tool control circuit according to claim 1, wherein the working parameter detection module detects a current parameter of the motor during running of the motor and then communicates the current parameter to the central control module.

### Claim 8 (depends on 1)

The electric tool control circuit according to claim 1, wherein the working parameter detection module has a current detection module which has a detection time proportional to a magnitude of current value detected when the motor is idling at high speed and reduces its speed.

### Claim 9

An electric tool control circuit comprising:
a central control module, a motor, a motor drive module, a working parameter detection module, a first switch module and a second switch module;
the central control module being electrically connected to the motor drive module, and the central control module controlling turn on and off of the motor drive module;
a protection module which can prevent a motor peripheral circuit from being damaged by motor clutter produced during running of the motor; and
the working parameter detection module being electrically connected to the motor and the central control module, and the working parameter detection module returning a parameter that is detected during running of the motor to the central control module, wherein the motor drive module is electrically connected to the motor by a first switch module and a second switch module, and the motor drive module controls the first and second switch modules to be discontinuously on and off, the respective statuses of the first switch module and the second switch module being on and off are always contrary so that when the first switch module is on, the second switch module is off, and when the first switch module is off, the second switch module is on, the working parameter detection module has a current detection module which has a detection time proportional to a magnitude of current value detected when the motor is idling at high speed and reduces its speed.

### Claim 10 (depends on 9)

The electric tool control circuit according to claim 9, the protection module having a spike absorption module and a follow current module, which respectively form a circuit loop with the motor, the spike absorption module including a first spike absorption module and a second spike absorption module.

### Claim 11 (depends on 10)

The electric tool control circuit according to claim 10, wherein the first spike absorption module is a capacitor, the second spike absorption module is a schottky diode, and the follow current module is a diode.

### Claim 12 (depends on 10)

The electric tool control circuit according to claim 10, wherein the first spike absorption module includes a resistor and a capacitor connected in series.

### Claim 13 (depends on 9)

The electric tool control circuit according to claim 9, wherein the first and second switch modules, the motor drive module and the motor are electrically connected to form a half-bridge driving circuit.

### Claim 14 (depends on 13)

The electric tool control circuit according to claim 13, wherein field effect transistors are used as the first and second switch modules.

### Claim 15 (depends on 9)

The electric tool control circuit according to claim 9, wherein the working parameter detection module detects a current parameter of the motor during running of the motor and then communicates the current parameter to the central control module.