CN219067856U

CN219067856U - Alarm signal output circuit for brushless motor controller

Info

Publication number: CN219067856U
Application number: CN202223508668.6U
Authority: CN
Inventors: 陈东勤; 王一六
Original assignee: Wuxi Fucee Electronic Technology Co ltd
Current assignee: Wuxi Fucee Electronic Technology Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-05-23
Anticipated expiration: 2032-12-27

Abstract

The utility model relates to the technical field of brushless motor warning, and discloses an alarm signal output circuit for a brushless motor controller, which comprises a driving unit, a constant current source unit, a load unit, a filtering unit and an overvoltage protection unit, wherein the driving unit is connected with the constant current source unit; when the device is actually used, the driving unit inputs driving voltage to the constant current source unit based on the received control signal, the constant current source unit responds to the driving voltage to output driving current, and the driving current generates voltage drop on the load unit, so that the device for outputting the control signal can be isolated from an external alarm device; in addition, the constant current source unit is arranged to output the driving current, so that the magnitude of the driving current is not influenced even if an external alarm device is short-circuited, and the situation of large current is avoided, and the damage of electronic devices is avoided when the brushless motor controller is adopted.

Description

Alarm signal output circuit for brushless motor controller

Technical Field

The utility model relates to the technical field of brushless motor warning, in particular to an alarm signal output circuit for a brushless motor controller.

Background

Unlike a brush motor, a brushless motor is operated by changing the current flow direction of a coil, and thus the brushless motor needs to be matched with a brushless motor controller to change the current flow direction of the coil of the brushless motor when in use. In order to ensure normal operation of the brushless motor, the brushless motor controller needs to detect the operation state of the brushless motor when in use, and timely disconnect the coil current input of the brushless motor when the brushless motor is blocked or in other abnormal conditions, and in addition, needs to output alarm signals to drive external alarm devices to act, such as luminous prompts and voice prompts. However, if the external alarm device is short-circuited, the current on the line outputting the alarm signal is excessively large, so that the electronic device on the line is damaged, and the brushless motor controller is failed.

Disclosure of Invention

In view of the shortcomings of the background art, the utility model provides an alarm signal output circuit for a brushless motor controller, which aims to solve the technical problems that when the existing brushless motor controller outputs an alarm signal to drive an external alarm device to act, if the alarm device is short-circuited, a large current is generated, and an electronic device is damaged to cause the brushless motor controller to malfunction.

In order to solve the technical problems, the utility model provides the following technical scheme: an alarm signal output circuit for a brushless motor controller comprises a driving unit, a constant current source unit, a load unit, a filtering unit and an overvoltage protection unit; the driving unit inputs driving voltage to the constant current source unit based on the received control signal, the constant current source unit responds to the driving voltage to output driving current, the driving current output end of the constant current source unit is electrically connected with the load unit, the electrical node of the load unit is electrically connected with the input end of the filtering unit, and the output end of the filtering unit is electrically connected with the overvoltage protection unit.

In a certain embodiment, the driving unit includes a resistor R24, a resistor R26, a transistor Q13, and a resistor R27; one end of the resistor R24 is configured to an input power supply, the other end of the resistor R24 is electrically connected with one end of the resistor R26, the other end of the resistor R26 is electrically connected with the collector of the triode Q13, the base of the triode Q13 receives the control signal through the resistor R27, and the emitter of the triode Q13 is grounded; the other end of the resistor R24 outputs the driving voltage when the transistor Q13 is turned on.

In one embodiment, the utility model further comprises a diode D3 and a capacitor C20, said capacitor C20 being connected in parallel with said resistor R24; the negative electrode of the diode D3 is electrically connected to one end of the resistor R24, and the positive electrode of the diode D3 is arranged on the input power supply.

In a certain embodiment, the constant current source unit includes a triode Q11, a resistor R25 and a triode Q12, where the triode Q11 and the triode Q12 are PNP type triodes; the emitter of the triode Q11 is electrically connected with one end of a resistor R25 and is configured to be input into a power supply, the other end of the resistor R25 is electrically connected with the grid electrode of the triode Q11 and the emitter of the triode Q12 respectively, the base electrode of the triode Q12 is electrically connected with the collector electrode of the triode Q11 and is used for receiving the driving voltage, and the collector electrode of the triode Q12 is used for outputting the driving current.

In a certain embodiment, the load unit comprises a load branch, the load branch comprises at least one load resistor, when the load branch comprises more than two load resistors, the load resistors are sequentially connected in series, and the filter unit is electrically connected with one electrical node on the load branch.

In a certain embodiment, the filtering unit includes a capacitor C21 and an inductor L4; one end of the capacitor C21 is electrically connected with one end of the inductor L4 and is configured to be electrically connected with an electrical node of the load unit, the other end of the capacitor C21 is grounded, and the other end of the inductor L4 is electrically connected with the overvoltage protection unit.

In a certain embodiment, the overvoltage protection unit includes a TVS diode TVS4, a negative electrode of the TVS diode TVS4 is electrically connected to the filtering unit, and a positive electrode of the TVS diode TVS4 is grounded.

Compared with the prior art, the utility model has the following beneficial effects: firstly, when the alarm signal is output by the utility model, a control signal is required to be input to the driving unit, and the utility model outputs the alarm signal based on the control signal, so that the isolation between the device for outputting the control signal and an external alarm device can be realized by the utility model; in addition, the constant current source unit is arranged to output driving current, the driving current generates voltage drop on the load unit, and even if an external device is short-circuited, the magnitude of the driving current is not influenced, so that the condition of large current is avoided, and the damage condition of an electronic device is avoided when the brushless motor controller is adopted.

Drawings

FIG. 1 is a schematic view of the structure of the present utility model in an embodiment;

fig. 2 is a circuit diagram of the present utility model in an embodiment.

Detailed Description

The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only the structures which are relevant to the utility model.

As shown in fig. 1, an alarm signal output circuit for a brushless motor controller includes a driving unit 1, a constant current source unit 2, a load unit 3, a filter unit 4, and an overvoltage protection unit 5; the driving unit 1 inputs a driving voltage to the constant current source unit 2 based on the received control signal, the constant current source unit 2 outputs a driving current in response to the driving voltage, a driving current output end of the constant current source unit 2 is electrically connected with the load unit 3, an electrical node of the load unit 3 is electrically connected with an input end of the filtering unit 4, and an output end of the filtering unit 4 is electrically connected with the overvoltage protection unit 5.

When receiving a high-level control signal, the constant current source unit 2 converts a power supply voltage input to the constant current source unit 2 into a driving current to be output, the driving current generates a voltage drop on the load unit 3, the voltage drop on the load unit 3 can be set by controlling the resistance value of the load unit 3, and the filtering unit 4 filters the voltage of an electrical node of the load unit 3 electrically connected with the voltage drop.

In actual use, when the utility model outputs an alarm signal, a control signal is required to be input into the driving unit 1, and the utility model outputs the alarm signal based on the control signal, so that the isolation between the device for outputting the control signal and an external alarm device can be realized through the utility model; in addition, the constant current source unit 2 is arranged to output driving current, the driving current generates voltage drop on the load unit 3, and even if an external device is short-circuited, the magnitude of the driving current is not influenced, so that the condition of large current is avoided, and the damage condition of an electronic device is avoided when the brushless motor controller is adopted.

Referring to fig. 2, in the present embodiment, the driving unit 1 includes a resistor R24, a resistor R26, a transistor Q13, and a resistor R27; one end of a resistor R24 is configured on an input power supply, the other end of the resistor R24 is electrically connected with one end of a resistor R26, the other end of the resistor R26 is electrically connected with a collector electrode of a triode Q13, a base electrode of the triode Q13 receives a control signal through a resistor R27, and an emitter electrode of the triode Q13 is grounded; the other end of the resistor R24 outputs a driving voltage when the transistor Q13 is turned on. In actual use, when the base of the transistor Q13 receives a high-level control signal, the transistor Q13 is turned on, and the other end of the resistor R24 of the driving unit 1 outputs a driving voltage.

In fig. 2, the utility model further comprises a diode D3 and a capacitor C20, the capacitor C20 being connected in parallel with a resistor R24; the negative electrode of the diode D3 is electrically connected to one end of the resistor R24, and the positive electrode of the diode D3 is arranged on the input power VCC.

Referring to fig. 2, in the present embodiment, the constant current source unit 2 includes a transistor Q11, a resistor R25, and a transistor Q12, where the transistor Q11 and the transistor Q12 are PNP transistors; the emitter of the triode Q11 is electrically connected with one end of a resistor R25 and is configured to be input into a power supply, the other end of the resistor R25 is electrically connected with the grid electrode of the triode Q11 and the emitter of the triode Q12 respectively, the base electrode of the triode Q12 is electrically connected with the collector electrode of the triode Q11 and is used for receiving driving voltage, and the collector electrode of the triode Q12 is used for outputting driving current.

When in actual use, when the external alarm device has overlarge current caused by short circuit, namely the current flowing through the triode Q12 is overlarge, so that the voltage drop on the resistor R25 is overlarge, the triode Q11 can be conducted, and the conducted triode Q11 can enable the conducting capacity of the triode Q12 to be weak at the moment, so that the current is reduced, and the damage of the device is avoided.

Referring to fig. 2, the load unit 3 includes a load branch including a load resistor R28. In practical use, the load branch may comprise more than two load resistors, and when the load branch may comprise more than two load resistors, the load resistors are sequentially connected in series, and the filter unit 4 is electrically connected to an electrical node on the load branch, where the electrical node does not comprise a ground terminal.

Referring to fig. 2, the filtering unit 4 includes a capacitor C21 and an inductor L4; one end of the capacitor C21 is electrically connected with one end of the inductor L4, and is configured to be electrically connected with an electrical node of the load unit 3, the other end of the capacitor C21 is grounded, and the other end of the inductor L4 is electrically connected with the overvoltage protection unit.

Referring to fig. 2, the overvoltage protection unit 5 includes a TVS diode TVS4, wherein a cathode of the TVS diode TVS4 is electrically connected to the filter unit 4, and an anode of the TVS diode TVS4 is grounded.

The present utility model has been made in view of the above-described circumstances, and it is an object of the present utility model to provide a portable electronic device capable of performing various changes and modifications without departing from the scope of the technical spirit of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims

1. An alarm signal output circuit for a brushless motor controller is characterized by comprising a driving unit, a constant current source unit, a load unit, a filtering unit and an overvoltage protection unit; the driving unit inputs driving voltage to the constant current source unit based on the received control signal, the constant current source unit responds to the driving voltage to output driving current, the driving current output end of the constant current source unit is electrically connected with the load unit, the electrical node of the load unit is electrically connected with the input end of the filtering unit, and the output end of the filtering unit is electrically connected with the overvoltage protection unit.

2. An alarm signal output circuit for a brushless motor controller according to claim 1, wherein the driving unit includes a resistor R24, a resistor R26, a transistor Q13, and a resistor R27; one end of the resistor R24 is configured to an input power supply, the other end of the resistor R24 is electrically connected with one end of the resistor R26, the other end of the resistor R26 is electrically connected with the collector of the triode Q13, the base of the triode Q13 receives the control signal through the resistor R27, and the emitter of the triode Q13 is grounded; the other end of the resistor R24 outputs the driving voltage when the transistor Q13 is turned on.

3. An alarm signal output circuit for a brushless motor controller according to claim 2, further comprising a diode D3 and a capacitor C20, the capacitor C20 being connected in parallel with the resistor R24; the negative electrode of the diode D3 is electrically connected to one end of the resistor R24, and the positive electrode of the diode D3 is arranged on the input power supply.

4. The alarm signal output circuit for a brushless motor controller according to claim 1, wherein the constant current source unit comprises a triode Q11, a resistor R25 and a triode Q12, and the triode Q11 and the triode Q12 are PNP type triodes; the emitter of the triode Q11 is electrically connected with one end of a resistor R25 and is configured to be input into a power supply, the other end of the resistor R25 is electrically connected with the grid electrode of the triode Q11 and the emitter of the triode Q12 respectively, the base electrode of the triode Q12 is electrically connected with the collector electrode of the triode Q11 and is used for receiving the driving voltage, and the collector electrode of the triode Q12 is used for outputting the driving current.

5. An alarm signal output circuit for a brushless motor controller according to claim 1, wherein the load unit comprises a load branch including at least one load resistor, the load resistors being serially connected in turn when the load branch includes two or more load resistors, the filter unit being electrically connected to one of the electrical nodes on the load branch.

6. An alarm signal output circuit for a brushless motor controller according to claim 1, wherein the filter unit includes a capacitor C21 and an inductance L4; one end of the capacitor C21 is electrically connected with one end of the inductor L4 and is configured to be electrically connected with an electrical node of the load unit, the other end of the capacitor C21 is grounded, and the other end of the inductor L4 is electrically connected with the overvoltage protection unit.

7. An alarm signal output circuit for a brushless motor controller according to claim 1, wherein the overvoltage protection unit comprises a TVS diode TVS4, a cathode of the TVS diode TVS4 is electrically connected to the filter unit, and an anode of the TVS diode TVS4 is grounded.