CN215956299U

CN215956299U - Brushless motor single-chip non-inductive rotor position and overcurrent detection circuit

Info

Publication number: CN215956299U
Application number: CN202122517147.6U
Authority: CN
Inventors: 王献伟; 徐东桂; 张文彬
Original assignee: Guangdong Weide Electric Co ltd
Current assignee: Guangdong Weide Electric Co ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-03-04
Anticipated expiration: 2031-10-19

Abstract

The utility model belongs to the technical field of motor detection, and particularly relates to a brushless motor single-chip non-inductive rotor position and overcurrent detection circuit. The negative input pin of the first operational amplifier chip is connected with phase voltage, a first resistor is connected between the power supply access end and the output end of the first operational amplifier chip, the output end of the first operational amplifier chip is connected with a second resistor in series, a first capacitor is connected between the other end of the second resistor and the grounding end of the first operational amplifier chip, and the positive input pin of the first operational amplifier chip is connected with the ground; in addition, a positive input end of an operational amplifier chip IV in the overcurrent signal detection circuit is connected with a test current, and a capacitor ten is connected between the positive input end and a four U grounding end of the operational amplifier chip IV; the negative input end of the four U of the operational amplifier chip is connected with a seventh resistor and a tenth resistor, and the other end of the seventh resistor is connected with a 3.3V power supply; the other end of the resistor ten is grounded, and a capacitor five is connected in parallel to the resistor ten. The single-chip brushless motor rotor position detection and overcurrent detection functions are adopted, and the brushless motor rotor position detection and overcurrent detection functions can have better disturbance resistance functions and wiring consistency.

Description

Brushless motor single-chip non-inductive rotor position and overcurrent detection circuit

Technical Field

The utility model belongs to the technical field of motor detection, and particularly relates to a brushless motor single-chip non-inductive rotor position and overcurrent detection circuit.

Background

The control mode of the existing brushless direct current motor is divided into the following steps according to the existence of a rotor position sensor: the control method comprises a position sensor control mode and a position sensor-free control mode, wherein the position sensor control mode is that a position sensor is arranged on a stator of the brushless direct current motor to detect the position of a rotor in the actual working process, and then position signals are converted into electric signals through A/D conversion, so that accurate commutation information is provided for an electronic commutation circuit, and the switching state of a power switching tube is controlled. The position sensorless control method is to indirectly obtain the rotor position by correspondingly processing physical quantities such as flux linkage, current and voltage of the motor, so as to control the motor.

Although the control mode of the brushless direct current motor adopted at present is more advanced and more accurate, the stability and the anti-interference performance are not satisfactory, and the occupied space at the tail part of the engine is larger.

Disclosure of Invention

Aiming at solving the problems of the defects and the shortcomings of the prior art; the utility model aims to provide a brushless motor single-chip non-inductive rotor position and overcurrent detection circuit which is simple in structure, reasonable in design and convenient to use.

In order to achieve the purpose, the utility model adopts the technical scheme that: the device comprises a U-phase zero-crossing detection circuit, a V-phase zero-crossing detection circuit, a W-phase zero-crossing detection circuit and an overcurrent signal detection circuit; the U-phase zero-crossing detection circuit consists of an operational amplifier chip I, a resistor II and a capacitor I; the negative input pin of the first operational amplifier chip is connected with the U-phase voltage, a first resistor is connected between the power supply access end and the output end of the first operational amplifier chip, the output end of the first operational amplifier chip is connected with a second resistor in series, a first capacitor is connected between the other end of the second resistor and the grounding end of the first operational amplifier chip, and the positive input pin of the first operational amplifier chip is connected with the ground; the U-phase zero-crossing detection circuit, the V-phase zero-crossing detection circuit and the W-phase zero-crossing detection circuit keep the same structure and connection relation; in addition, the overcurrent signal detection circuit is adjusted on the basis of a U-phase zero-crossing detection circuit, and the difference lies in the change of an input end, a positive input end of four U of an operational amplifier chip in the overcurrent signal detection circuit is connected with a test current, and a capacitor ten is connected between the positive input end and a grounding end of the four U of the operational amplifier chip; the negative input end of the four U of the operational amplifier chip is connected with a seventh resistor and a tenth resistor, and the other end of the seventh resistor is connected with a 3.3V power supply; the other end of the resistor ten is grounded, and a capacitor five is connected in parallel to the resistor ten.

Preferably, the four operational amplifier chips in the U-phase zero-crossing detection circuit, the V-phase zero-crossing detection circuit, the W-phase zero-crossing detection circuit and the overcurrent signal detection circuit are LM 324.

Preferably, the output voltages of the U-phase zero-crossing detection circuit, the V-phase zero-crossing detection circuit and the W-phase zero-crossing detection circuit are connected with the detection MCU to detect the position of the electronic rotor.

Preferably, the output current of the over-current signal detection circuit is connected with the detection MCU for over-current detection.

Preferably, the power supply ends of four operational amplifier chips in the U-phase zero-crossing detection circuit, the V-phase zero-crossing detection circuit, the W-phase zero-crossing detection circuit and the overcurrent signal detection circuit are connected with a 3.3V power supply.

After adopting the structure, the utility model has the beneficial effects that: the single-chip brushless motor rotor position detection and overcurrent detection functions are adopted, the brushless motor rotor position detection and overcurrent detection functions can have better disturbance resistance functions and wiring consistency, the occurrence of zero-crossing signals of the brushless motor can be accurately detected, and accurate signals are timely provided for phase change and current conversion of the MCU.

Drawings

To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is described in detail by the following specific embodiments and the accompanying drawings.

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

In order that the objects, aspects and advantages of the utility model will become more apparent, the utility model will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.

Referring to fig. 1, the following technical solutions are adopted in the present embodiment: the device comprises a U-phase zero-crossing detection circuit 1, a V-phase zero-crossing detection circuit 2, a W-phase zero-crossing detection circuit 3 and an overcurrent signal detection circuit 4; the U-phase zero-crossing detection circuit 1 consists of an operational amplifier chip I U1, a resistor I R1, a resistor II R2 and a capacitor I C1; the negative input pin of the first operational amplifier chip U1 is connected with a U-phase voltage, a first resistor R1 is connected between the power supply access end and the output end of the first operational amplifier chip U1, the output end of the first operational amplifier chip U1 is connected with a second resistor R2 in series, a first capacitor C1 is connected between the other end of the second resistor R2 and the grounding end of a first operational amplifier chip U1, and the positive input pin of the first operational amplifier chip U1 is grounded; the U-phase zero-crossing detection circuit 1, the V-phase zero-crossing detection circuit 2 and the W-phase zero-crossing detection circuit 3 keep the same structure and connection relation; in addition, the overcurrent signal detection circuit 4 is adjusted based on the U-phase zero-crossing detection circuit 1, and the difference lies in the change of the input end, the positive input end of the operational amplifier chip four U4 in the overcurrent signal detection circuit 4 is connected with the test current, and a capacitor ten C10 is connected between the positive input end and the grounding end of the operational amplifier chip four U4; the negative input end of the operational amplifier chip four U4 is connected with the resistor seven R7 and the resistor ten R10, and the other end of the resistor seven R7 is connected with a 3.3V power supply; the other end of the resistor decar 10 is grounded, and a capacitor penta C5 is connected in parallel to the resistor decar 10.

The four operational amplifier chips in the U-phase zero-crossing detection circuit 1, the V-phase zero-crossing detection circuit 2, the W-phase zero-crossing detection circuit 3 and the overcurrent signal detection circuit 4 are LM 324; (ii) a The output voltages of the U-phase zero-crossing detection circuit 1, the V-phase zero-crossing detection circuit 2 and the W-phase zero-crossing detection circuit 3 are connected with a detection MCU (microprogrammed control Unit) to carry out electronic rotor position detection; the output current of the over-current signal detection circuit 4 is connected with a detection MCU for over-current detection; and four paths of operational amplifier chip power supplies in the U-phase zero-crossing detection circuit 1, the V-phase zero-crossing detection circuit 2, the W-phase zero-crossing detection circuit 3 and the overcurrent signal detection circuit 4 are connected with a 3.3V power supply.

The working principle of the specific embodiment is as follows: the detection circuit for the three-phase zero-crossing and the total current is respectively realized by utilizing the four-way operational amplifier chip LM324, the detection of a zero-crossing signal and an overcurrent signal can be realized through the comparison function setting, the four-way signal is transmitted to the MCU, and the detection of the rotor position of the brushless motor and the detection of the total current overcurrent are quickly processed.

After adopting above-mentioned structure, this embodiment beneficial effect does: the single-chip brushless motor rotor position detection and overcurrent detection functions are adopted, the brushless motor rotor position detection and overcurrent detection functions can have better disturbance resistance functions and wiring consistency, the occurrence of zero-crossing signals of the brushless motor can be accurately detected, and accurate signals are timely provided for phase change and current conversion of the MCU.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. Brushless motor single-chip noninductive rotor position and overcurrent detection circuit, its characterized in that: the device comprises a U-phase zero-crossing detection circuit (1), a V-phase zero-crossing detection circuit (2), a W-phase zero-crossing detection circuit (3) and an overcurrent signal detection circuit (4); the U-phase zero-crossing detection circuit (1) consists of a first operational amplifier chip (U1), a first resistor (R1), a second resistor (R2) and a first capacitor (C1); the negative input pin of the operational amplifier chip I (U1) is connected with a U-phase voltage, a resistor I (R1) is connected between the power supply access end and the output end of the operational amplifier chip I (U1), the output end of the operational amplifier chip I (U1) is connected with a resistor II (R2) in series, a capacitor I (C1) is connected between the other end of the resistor II (R2) and the grounding end of the operational amplifier chip I (U1), and the positive input pin of the operational amplifier chip I (U1) is grounded; the U-phase zero-crossing detection circuit (1), the V-phase zero-crossing detection circuit (2) and the W-phase zero-crossing detection circuit (3) keep the same structure and connection relation; in addition, the overcurrent signal detection circuit (4) is adjusted on the basis of the U-phase zero-crossing detection circuit (1), and the difference lies in the change of an input end, a positive input end of an operational amplifier chip four (U4) in the overcurrent signal detection circuit (4) is connected with a test current, and a capacitor ten (C10) is connected between the positive input end and a grounding end of the operational amplifier chip four (U4); the negative input end of the operational amplifier chip IV (U4) is connected with a resistor seven (R7) and a resistor ten (R10), and the other end of the resistor seven (R7) is connected with a 3.3V power supply; the other end of the resistor ten (R10) is grounded, and a capacitor five (C5) is connected in parallel to the resistor ten (R10).

2. The single-chip non-inductive rotor position and overcurrent detection circuit of claim 1, wherein: the four operational amplifier chips in the U-phase zero-crossing detection circuit (1), the V-phase zero-crossing detection circuit (2), the W-phase zero-crossing detection circuit (3) and the overcurrent signal detection circuit (4) are LM 324.

3. The single-chip non-inductive rotor position and overcurrent detection circuit of claim 1, wherein: and the output voltages of the U-phase zero-crossing detection circuit (1), the V-phase zero-crossing detection circuit (2) and the W-phase zero-crossing detection circuit (3) are connected with the detection MCU to carry out electronic rotor position detection.

4. The single-chip non-inductive rotor position and overcurrent detection circuit of claim 1, wherein: and the output current of the overcurrent signal detection circuit (4) is connected with the detection MCU for overcurrent detection.

5. The single-chip non-inductive rotor position and overcurrent detection circuit of claim 1, wherein: and four paths of operational amplifier chip power supply ends in the U-phase zero-crossing detection circuit (1), the V-phase zero-crossing detection circuit (2), the W-phase zero-crossing detection circuit (3) and the overcurrent signal detection circuit (4) are connected with a 3.3V power supply.