CN214959360U - Motor driver circuit and motor built-in driver - Google Patents

Abstract

The utility model discloses a motor driver circuit and motor built-in driver, wherein the motor driver circuit includes master control circuit and connection master control circuit's singlechip supply circuit, undervoltage protection circuit, three-phase bridge circuit, overflow detection circuitry, three-phase hall sensor circuit and positive reverse control circuit, three-phase bridge circuit still connects overflow detection circuitry. The utility model provides a motor driver circuit simple structure, the interference killing feature is stronger to can provide functions such as overcurrent detection, undervoltage protection, hall default phase protection, locked rotor protection, ensure under basic motor drive function and protect function's the prerequisite, simplify driver circuit's circuit structure, be favorable to reducing motor driver's internal circuit module size, make this motor driver can place in the motor, expanded this motor driver's range of application.

Description

Motor driver circuit and motor built-in driver

Technical Field

The utility model relates to a motor drive technical field, concretely relates to motor driver circuit and motor built-in driver.

Background

The motor driver mainly has the following two functions: firstly, the starting, the stopping, the rotating speed and the like of the motor are controlled; secondly, various protections are carried out on the motor, such as overload, short circuit, undervoltage and the like. At present, the motor drive is mainly driven by a relay or a power transistor, and can also be driven by a silicon controlled rectifier or a power type MOS field effect transistor. In order to meet various control requirements on different types of motors (such as working current and voltage of the motors, motor speed regulation, forward and reverse rotation control of direct current motors and the like), motor drivers with various styles exist on the market, the motor driving circuit structures inside the drivers are usually different, some motor driving circuit structures are complex, the anti-interference capacity is poor, some circuit structures are too simple, the motor driving control functions which can be provided are limited, the market requirements cannot be met, and some motor drivers can only be used as external drivers because the size of an internal circuit module is large and cannot be built in the motors.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a motor driver circuit and motor built-in driver, wherein, motor driver circuit structure is simple, the interference killing feature is stronger, and can provide overflow detection, undervoltage protection, hall default phase protection, functions such as locked rotor protection, under the prerequisite of ensureing basic motor drive function and protect function, the circuit structure of driver circuit has been simplified, be favorable to reducing motor driver's internal circuit module size, make this motor driver can place in the motor, this motor driver's range of application has been expanded.

To achieve the purpose, the utility model adopts the following technical proposal:

provides a motor driver circuit, which comprises a main control circuit, a singlechip power supply circuit, an undervoltage protection circuit, a three-phase bridge circuit, an overcurrent detection circuit, a three-phase Hall sensor circuit and a forward and reverse rotation control circuit, wherein the singlechip power supply circuit, the undervoltage protection circuit, the three-phase bridge circuit, the overcurrent detection circuit, the three-phase Hall sensor circuit and the forward and reverse rotation control circuit are connected with the main control circuit,

the main control circuit comprises a main control chip IC1 with the model number of STM8S003, a connecting piece CN1, a resistor R9, a capacitor C8, a capacitor C10 and a capacitor C11, wherein an eighteenth pin of the main control chip IC1 is connected with a third interface of the connecting piece CN1, and a fourth pin is connected with a first interface of the connecting piece CN 1; the fourth interface of the connecting piece CN1 is connected with the 5V voltage output end of the singlechip power supply circuit, and the second interface is grounded; one end of the resistor R9 is connected with the fourth pin of the main control chip IC1, and the other end of the resistor R9 is connected with the 5V voltage output end of the singlechip power supply circuit; one end of the capacitor C8 is connected with the fourth pin of the main control chip IC1, and the other end of the capacitor C8 is grounded; a fifth pin and a sixth pin of the main control chip IC1 are suspended, and a ninth pin is externally connected with a 5V voltage output end of the singlechip power supply circuit; one end of the capacitor C10 is connected with the ninth pin of the main control chip IC1, and the other end of the capacitor C10 is grounded; the capacitor C10 is connected between the eighth pin and the seventh pin of the main control chip IC, and the seventh pin of the main control chip IC1 is grounded.

Preferably, the single chip microcomputer power supply circuit comprises a voltage reduction chip U2, capacitors C5, C6 and C7, a first port VIN of the voltage reduction chip U2 is externally connected with a power supply VCC, a second port GND is grounded, and a third port VOUT is used as a 5V voltage output end of the single chip microcomputer power supply circuit; two ends of the capacitor C5 are connected between the first port VIN and the second port GND of the buck chip U2; two ends of the capacitor C6 are connected between the second port GND and the third port VOUT of the buck chip U2; the capacitor C7 is connected in parallel across the capacitor C6.

Preferably, the undervoltage protection circuit includes resistance R15, R16 and electric capacity C12, the power VCC is connected to resistance R15's one end, and the other end is connected ground connection and connection behind the resistance R16 electric capacity C12 ground connection and be connected to the second pin of main control chip IC 1.

Preferably, the three-phase bridge circuit comprises N + P tubes Q1, Q2, Q3, a triode Q4, Q5, Q6, resistors R3, R4, R2, R17, R13, R14, R11, R5 and R7, and connectors U5, U6 and U7, wherein first ports of the N + P tubes Q1, Q2 and Q1 are connected with a node F _ O of the over-current detection circuit; a second port of the N + P tube Q1 is connected in series with the resistor R3 and then connected to a fifteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R4 is connected between the third port and a fourth port, the fourth port is simultaneously connected with a collector of the triode Q4, and fifth to eighth ports are connected to an interface provided by the connecting piece U5 and connected with a three-phase wire of the motor; an emitter of the triode Q4 is grounded, and a base of the triode Q4 is connected to a sixteenth pin of the main control chip IC1 after being connected with the resistor R2;

a second port of the N + P tube Q2 is connected in series with the resistor R17 and then connected to a fourteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R13 is connected between the third port and a fourth port, the fourth port is simultaneously connected to a collector of the triode Q5, and fifth to eighth ports are connected to an interface provided by the connecting piece U6 and connected to another three-phase wire of the electrode; an emitter of the triode Q5 is grounded, and a base of the triode Q5 is connected to the seventeenth pin of the main control chip IC1 after being connected with the resistor R14;

a second port of the N + P tube Q3 is connected in series with the resistor R11 and then connected to a nineteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R5 is connected between the third port and a fourth port, the fourth port is simultaneously connected with a collector of the triode Q6, and fifth to eighth ports are connected to an interface provided by the connecting piece U7 and connected with a last three-phase lead of the motor; the emitter of the triode Q6 is grounded, and the base is connected to the thirteenth pin of the main control chip IC1 after being connected to the resistor R7.

Preferably, the over-current detection circuit comprises a first over-current detection circuit and a second over-current detection circuit, the first over-current detection circuit comprises a comparator IC2A, resistors R21, R23, R24, R20, R19, RS1 and capacitors C14 and C13, one end of the resistor R19 is connected with the positive input end of the comparator IC2A, and the other end of the resistor R19 is used as the node F _ O of the first over-current detection circuit; the positive input end of the comparator IC2A is also connected in series with the resistor R20 and then grounded; one end of the resistor RS1 is grounded, and the other end of the resistor RS1 is connected in series with the resistor 19 and then is connected with the positive input end of the comparator IC 2A;

one end of the resistor R24 is grounded, and the other end of the resistor R24 is connected with the negative input end of the comparator IC 2A; the resistor R23 is connected between the output terminal and the negative input terminal of the comparator IC 2A; the output end of the comparator IC2A is connected in series with the resistor R21 and then is connected to the third pin of the main control chip IC1, and the output end of the comparator IC2A is also connected with the capacitor C14 and then is grounded; one end of the capacitor C13 is connected with a pull-up voltage supply end of the comparator IC2A, and the other end of the capacitor C13 is grounded; the pull-down voltage supply terminal of the comparator IC2A is connected to ground.

Preferably, the second overcurrent detection circuit comprises a comparator IC2B, resistors R25, R27, R28 and capacitors C15 and C16, wherein a positive input end of the comparator IC2B is connected with the resistor R27 and then grounded, and is connected with the resistor R25 and then externally connected with a voltage of 5V; one end of the resistor R28 is connected with the negative input end of the comparator IC2B, and the other end of the resistor R28 is used as the ground F _ O of the second overcurrent detection circuit; the negative input of the comparator IC2B is connected with the capacitor C16 and then grounded; the output end of the comparator IC2B is connected with the eleventh pin of the main control chip IC1 and the capacitor C15 and then is grounded.

Preferably, the three-phase hall sensor circuit comprises hall sensors H1, H2, H3, resistors R22, R26, R29 and capacitors C19, C18, and C17, the VDD terminals of the hall sensors H1, H2, and H3 are externally connected with 5V voltage, and the GND terminal is grounded; the resistor R22 is connected between the VDD end and the OUT end of the Hall sensor H1, the capacitor C19 is connected between the OUT end and the GND end of the Hall sensor H1, and the OUT end of the Hall sensor H1 is connected with a first pin of the main control chip IC 1;

the resistor R26 is connected between the VDD end and the OUT end of the Hall sensor H2, the capacitor C18 is connected between the OUT end and the GND end of the Hall sensor H2, and the OUT end of the Hall sensor H2 is connected with the twentieth pin of the main control chip IC 1;

the resistor R29 is connected between the VDD end and the OUT end of the Hall sensor H3, the capacitor C17 is connected between the OUT end and the GND end of the Hall sensor H3, and the OUT end of the Hall sensor H3 is connected with a tenth pin of the main control chip IC 1.

Preferably, the forward and reverse rotation control circuit comprises resistors R8 and R10 and a capacitor C9, one end of the resistor R8 is connected to an ac input, and the other end of the resistor R8 is connected in series with the resistor R10, then grounded and connected to the twelfth pin of the main control chip IC 1; one end of the capacitor C9 is connected with the twelfth pin of the main control chip IC1, and the other end is grounded.

Preferably, the motor driver circuit further comprises an input rectifying circuit and an input filter circuit, the input rectifying circuit comprises an alternating current output connection member P1, a voltage stabilizing diode D1, a diode D2, a diode D4, a diode D3 and a diode D5, the cathode of the diode D2 is connected with the cathode of the diode D4, the anode of the diode D4 is connected with the cathode of the diode D5, the anode of the diode D5 is connected with the anode of the diode D3, the cathode of the diode D3 is connected with the anode of the diode D2, and the diodes D2, D4, D5 and D2 are connected end to form a diode loop; the first interface provided by the AC output connection P1 is connected at node A of the diode loop and the second interface provided by the AC output connection P1 is connected at node B of the diode loop; the anode of the zener diode D1 is connected to the second interface of the ac output connector P1, the cathode of the zener diode D1 is connected to the first interface of the ac output connector P1, and the ac power output by the ac output connector P1 is rectified by the rectifier circuit and then outputs dc power VCC from the node C of the diode loop; the node D of the diode loop is grounded;

the input filter circuit comprises capacitors C1 and C2, one end of the capacitor C2 is connected with the direct current VCC, the other end of the capacitor C2 is grounded, and the capacitor C1 is connected in parallel with two ends of the capacitor C2;

the N + P tubes Q1, Q2 and Q3 adopt MOS tubes with the model number of AM 4545C;

the comparator IC2A and the comparator IC2B are model SGM 8632.

The utility model also provides a built-in driver of motor, place in the motor, be provided with in the driver the motor driver circuit.

The utility model discloses following beneficial effect has:

1. the motor driver circuit has a simple structure and strong anti-interference capability, can provide functions of overcurrent detection, undervoltage protection, Hall open-phase protection, locked rotor protection and the like, simplifies the circuit structure of the driver circuit on the premise of ensuring basic motor driving function and protection function, and is beneficial to reducing the size of an internal circuit module of the motor driver;

2. the motor driver adopts smaller circuit module size, which is beneficial to the miniaturization design and production manufacture of the motor driver, and the motor driver with smaller size can be embedded in the motor, thereby expanding the application range of the motor driver and being beneficial to improving the market competitiveness of the product.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a block diagram of a circuit structure of a motor driver circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of the master control circuit in the motor driver circuit;

FIG. 3 is a schematic diagram of the power supply circuit of the single-chip microcomputer in the motor driver circuit;

FIG. 4 is a schematic diagram of the undervoltage protection circuit in the motor driver circuit;

FIG. 5 is a schematic diagram of a three-phase bridge circuit in the motor driver circuit;

FIG. 6 is a schematic diagram of an over-current detection circuit in the motor driver circuit;

FIG. 7 is a schematic diagram of a three-phase Hall sensor circuit in a motor driver circuit;

FIG. 8 is a schematic diagram of a forward/reverse rotation control circuit in the motor driver circuit;

FIG. 9 is a schematic diagram of an input rectification circuit in the motor driver circuit;

FIG. 10 is a schematic diagram of the structure of an input filter circuit in the motor driver circuit;

FIG. 11 is a schematic diagram of the forward/reverse rotation control circuit connected to the input rectification circuit.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being either a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the motor driver circuit provided in the embodiment of the present invention comprises a main control circuit, and a single chip microcomputer power supply circuit, an under-voltage protection circuit, a three-phase bridge circuit, an over-current detection circuit, a three-phase hall sensor circuit, and a forward/reverse rotation control circuit connected to the main control circuit, wherein the three-phase bridge circuit is further connected to the over-current detection circuit,

specifically, as shown in fig. 2, the main control circuit includes a main control chip IC1 of model STM8S003, a connecting element CN1, a resistor R9, a capacitor C8, a capacitor C10, and a capacitor C11, an eighteenth pin of the main control chip IC1 is connected to the third interface of the connecting element CN1, and a fourth pin is connected to the first interface of the connecting element CN 1; the fourth interface of the connecting piece CN1 is connected with the 5V voltage output end of the singlechip power supply circuit, and the second interface is grounded; one end of the resistor R9 is connected with the fourth pin of the main control chip IC1, and the other end of the resistor R9 is connected with the 5V voltage output end of the singlechip power supply circuit; one end of the capacitor C8 is connected with the fourth pin of the main control chip IC1, and the other end of the capacitor C8 is grounded; a fifth pin and a sixth pin of the main control chip IC1 are suspended, and a ninth pin is externally connected with a 5V voltage output end of the singlechip power supply circuit; one end of the capacitor C10 is connected with the ninth pin of the main control chip IC1, and the other end of the capacitor C10 is grounded; the capacitor C10 is connected between the eighth pin and the seventh pin of the main control chip IC, and the seventh pin of the main control chip IC1 is grounded.

Specifically, as shown in fig. 3, the power supply circuit of the single chip microcomputer includes a voltage-reducing chip U2, a capacitor C5, a capacitor C6, and a capacitor C7, a first port VIN of the voltage-reducing chip U2 is externally connected to a power supply VCC, a second port GND is grounded, and a third port VOUT is used as a 5V voltage output end of the power supply circuit of the single chip microcomputer; two ends of the capacitor C5 are connected between the first port VIN and the second port GND of the buck chip U2; two ends of the capacitor C6 are connected between the second port GND and the third port VOUT of the buck chip U2; the capacitor C7 is connected in parallel across the capacitor C6.

Specifically, as shown in fig. 4, the under-voltage protection circuit includes resistors R15, R16 and capacitor C12, the power VCC is connected to one end of resistor R15, and the other end is connected to ground behind resistor R16 and connect ground behind capacitor C12 and be connected to the second pin of main control chip IC 1.

Specifically, as shown in fig. 5, the three-phase bridge circuit includes N + P transistors Q1, Q2, Q3, a transistor Q4, Q5, Q6, a resistor R3, an R4, an R2, an R17, an R13, an R14, an R11, an R5, an R7, and connectors U5, U6, and U7, wherein first ports of the N + P transistor Q1, the N + P transistor Q2, and the N + P transistor Q1 are connected to a node F _ O of the over-current detection circuit; a second port of the N + P tube Q1 is connected in series with the resistor R3 and then connected to a fifteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R4 is connected between the third port and a fourth port, the fourth port is simultaneously connected with a collector of the triode Q4, and fifth to eighth ports are connected to an interface provided by the connecting piece U5 and connected with a three-phase wire of the motor; an emitter of the triode Q4 is grounded, and a base of the triode Q4 is connected to a sixteenth pin of the main control chip IC1 after being connected with the resistor R2;

a second port of the N + P tube Q2 is connected in series with the resistor R17 and then connected to a fourteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R13 is connected between the third port and a fourth port, the fourth port is simultaneously connected to a collector of the triode Q5, and fifth to eighth ports are connected to an interface provided by the connecting piece U6 and connected to another three-phase wire of the electrode; an emitter of the triode Q5 is grounded, and a base of the triode Q5 is connected to the seventeenth pin of the main control chip IC1 after being connected with the resistor R14;

a second port of the N + P tube Q3 is connected in series with the resistor R11 and then connected to a nineteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R5 is connected between the third port and a fourth port, the fourth port is simultaneously connected with a collector of the triode Q6, and fifth to eighth ports are connected to an interface provided by the connecting piece U7 and connected with a last three-phase lead of the motor; the emitter of the triode Q6 is grounded, and the base is connected to the thirteenth pin of the main control chip IC1 after being connected to the resistor R7.

Specifically, as shown in fig. 6, the over-current detection circuit includes a first over-current detection circuit and a second over-current detection circuit, the first over-current detection circuit includes a comparator IC2A, resistors R21, R23, R24, R20, R19, RS1 and capacitors C14, C13, one end of the resistor R19 is connected to the positive input terminal of the comparator IC2A, and the other end is used as the node F _ O of the first over-current detection circuit; the positive input end of the comparator IC2A is also connected in series with the resistor R20 and then grounded; one end of the resistor RS1 is grounded, and the other end of the resistor RS1 is connected in series with the resistor 19 and then is connected with the positive input end of the comparator IC 2A;

one end of the resistor R24 is grounded, and the other end of the resistor R24 is connected with the negative input end of the comparator IC 2A; the resistor R23 is connected between the output terminal and the negative input terminal of the comparator IC 2A; the output end of the comparator IC2A is connected in series with the resistor R21 and then is connected to the third pin of the main control chip IC1, and the output end of the comparator IC2A is also connected with the capacitor C14 and then is grounded; one end of the capacitor C13 is connected with a pull-up voltage supply end of the comparator IC2A, and the other end of the capacitor C13 is grounded; the pull-down voltage supply terminal of the comparator IC2A is connected to ground.

The second overcurrent detection circuit comprises a comparator IC2B, resistors R25, R27 and R28, capacitors C15 and C16, wherein the positive input end of the comparator IC2B is connected with the resistor R27 and then grounded, and is connected with the resistor R25 and then externally connected with 5V voltage; one end of the resistor R28 is connected with the negative input end of the comparator IC2B, and the other end of the resistor R28 is used as the ground F _ O of the second overcurrent detection circuit; the negative input of the comparator IC2B is connected with the capacitor C16 and then grounded; the output end of the comparator IC2B is connected with the eleventh pin of the main control chip IC1 and the capacitor C15 and then is grounded.

Specifically, as shown in fig. 7, the three-phase hall sensor circuit includes hall sensors H1, H2, H3, resistors R22, R26, R29, and capacitors C19, C18, and C17, wherein VDD terminals of the hall sensors H1, H2, and H3 are externally connected with 5V voltage, and a GND terminal is grounded; the resistor R22 is connected between the VDD end and the OUT end of the Hall sensor H1, the capacitor C19 is connected between the OUT end and the GND end of the Hall sensor H1, and the OUT end of the Hall sensor H1 is connected with a first pin of the main control chip IC 1;

the resistor R26 is connected between the VDD end and the OUT end of the Hall sensor H2, the capacitor C18 is connected between the OUT end and the GND end of the Hall sensor H2, and the OUT end of the Hall sensor H2 is connected with the twentieth pin of the main control chip IC 1;

the resistor R29 is connected between the VDD end and the OUT end of the Hall sensor H3, the capacitor C17 is connected between the OUT end and the GND end of the Hall sensor H3, and the OUT end of the Hall sensor H3 is connected with a tenth pin of the main control chip IC 1.

Specifically, as shown in fig. 8, the forward/reverse rotation control circuit includes resistors R8, R10 and a capacitor C9, one end of the resistor R8 is connected to an ac input (the end of the resistor R8 is connected to the first interface of the ac output connector P1 in the input rectification circuit in fig. 11), and the other end of the resistor R10 is connected in series, then grounded, and connected to the twelfth pin of the main control chip IC 1; one end of the capacitor C9 is connected with the twelfth pin of the main control chip IC1, and the other end is grounded.

As shown in fig. 1, the motor driver circuit further includes an input rectifying circuit and an input filter circuit, specifically, as shown in fig. 9, the input rectifying circuit includes an ac output connection P1, a zener diode D1, diodes D2, D4, D3, and D5, a cathode of the diode D2 is connected to a cathode of the diode D4, an anode of the diode D4 is connected to a cathode of the diode D5, an anode of the diode D5 is connected to an anode of the diode D3, a cathode of the diode D3 is connected to an anode of the diode D2, and the diodes D2, D4, D5, and D2 are connected end to form a diode loop; the first interface provided by the AC output connection P1 is connected at node A of the diode loop and the second interface provided by the AC output connection P1 is connected at node B of the diode loop; the anode of the zener diode D1 is connected to the second interface of the ac output connector P1, the cathode of the zener diode D1 is connected to the first interface of the ac output connector P1, and the ac power output by the ac output connector P1 is rectified by the rectifier circuit and then outputs dc power VCC from the node C of the diode loop; the node D of the diode loop is grounded;

specifically, as shown in fig. 10, the input filter circuit includes capacitors C1 and C2, one end of the capacitor C2 is connected to the dc VCC, the other end is grounded, and the capacitor C1 is connected in parallel to two ends of the capacitor C2;

in this embodiment, the N + P transistors Q1, Q2, and Q3 preferably use MOS transistors of type AM 4545C.

The comparator IC2A and the comparator IC2B are preferably SGM8632 in model number.

The utility model also provides a built-in driver of motor, place the motor in, be provided with foretell motor driver circuit in this driver.

Following is right the embodiment of the utility model provides a motor control and motor protection function that motor driver circuit can realize illustrate by way of example:

the undervoltage protection circuit in the driver can provide undervoltage protection function, and the driver can automatically close the output when the input voltage of the driver is lower than 7V;

an over-current detection circuit in the driver can provide an over-current protection function, and the driver can automatically close the output when the load current of the motor exceeds 2A.

The three-phase hall sensor circuit in the driver circuit can provide a hall open-phase protection function, and when the hall of the driver is open-phase or the phase sequence is wrong, the control output of the driver is turned off.

The driver circuit can also provide a motor locked-rotor protection function, when the motor is in a locked-rotor state, the driver controls the motor to be powered off after the locked-rotor state lasts for 1-1.5 seconds, the driver drives the motor to be restarted after the motor is powered off for 2-3 seconds, and if the motor is continuously started for 5 times or is in the locked-rotor state, the driver can shut off the output to protect the motor.

In addition, the driver can rectify the alternating current input into direct current output, and can filter the direct current input to filter voltage pulses in the on-off of the driver.

It should be understood that the above-described embodiments are merely illustrative of the preferred embodiments of the present invention and the technical principles thereof. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, these modifications are within the scope of the present invention as long as they do not depart from the spirit of the present invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.

Claims (10)

1. A motor driver circuit is characterized by comprising a main control circuit, a singlechip power supply circuit, an undervoltage protection circuit, a three-phase bridge circuit, an overcurrent detection circuit, a three-phase Hall sensor circuit and a forward and reverse rotation control circuit, wherein the singlechip power supply circuit, the undervoltage protection circuit, the three-phase bridge circuit, the overcurrent detection circuit, the three-phase Hall sensor circuit and the forward and reverse rotation control circuit are connected with the main control circuit,

the main control circuit comprises a main control chip IC1 with the model number of STM8S003, a connecting piece CN1, a resistor R9, a capacitor C8, a capacitor C10 and a capacitor C11, wherein an eighteenth pin of the main control chip IC1 is connected with a third interface of the connecting piece CN1, and a fourth pin is connected with a first interface of the connecting piece CN 1; the fourth interface of the connecting piece CN1 is connected with the 5V voltage output end of the singlechip power supply circuit, and the second interface is grounded; one end of the resistor R9 is connected with the fourth pin of the main control chip IC1, and the other end of the resistor R9 is connected with the 5V voltage output end of the singlechip power supply circuit; one end of the capacitor C8 is connected with the fourth pin of the main control chip IC1, and the other end of the capacitor C8 is grounded; a fifth pin and a sixth pin of the main control chip IC1 are suspended, and a ninth pin is externally connected with a 5V voltage output end of the singlechip power supply circuit; one end of the capacitor C10 is connected with the ninth pin of the main control chip IC1, and the other end of the capacitor C10 is grounded; the capacitor C10 is connected between the eighth pin and the seventh pin of the main control chip IC, and the seventh pin of the main control chip IC1 is grounded.

2. The motor driver circuit of claim 1, wherein the single-chip microcomputer power supply circuit comprises a voltage reduction chip U2, capacitors C5, C6 and C7, a first port VIN of the voltage reduction chip U2 is externally connected with a power supply VCC, a second port GND is grounded, and a third port VOUT serves as a 5V voltage output end of the single-chip microcomputer power supply circuit; two ends of the capacitor C5 are connected between the first port VIN and the second port GND of the buck chip U2; two ends of the capacitor C6 are connected between the second port GND and the third port VOUT of the buck chip U2; the capacitor C7 is connected in parallel across the capacitor C6.

3. The motor driver circuit according to claim 1 or 2, wherein the under-voltage protection circuit comprises resistors R15 and R16 and a capacitor C12, one end of the resistor R15 is connected to VCC, and the other end of the resistor R15 is connected to ground after being connected to the resistor R16 and to ground after being connected to the capacitor C12 and to a second pin of the main control chip IC 1.

4. The motor driver circuit of claim 3, wherein the three-phase bridge circuit comprises N + P transistors Q1, Q2, Q3, a transistor Q4, Q5, Q6, a resistor R3, R4, R2, R17, R13, R14, R11, R5, R7 and connectors U5, U6, U7, wherein first ports of the N + P transistors Q1, the N + P transistors Q2 and the N + P transistors Q1 are connected with a node F _ O of the over-current detection circuit; a second port of the N + P tube Q1 is connected in series with the resistor R3 and then connected to a fifteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R4 is connected between the third port and a fourth port, the fourth port is simultaneously connected with a collector of the triode Q4, and fifth to eighth ports are connected to an interface provided by the connecting piece U5 and connected with a three-phase wire of the motor; an emitter of the triode Q4 is grounded, and a base of the triode Q4 is connected to a sixteenth pin of the main control chip IC1 after being connected with the resistor R2;

a second port of the N + P tube Q2 is connected in series with the resistor R17 and then connected to a fourteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R13 is connected between the third port and a fourth port, the fourth port is simultaneously connected to a collector of the triode Q5, and fifth to eighth ports are connected to an interface provided by the connecting piece U6 and connected to another three-phase wire of the electrode; an emitter of the triode Q5 is grounded, and a base of the triode Q5 is connected to the seventeenth pin of the main control chip IC1 after being connected with the resistor R14;

a second port of the N + P tube Q3 is connected in series with the resistor R11 and then connected to a nineteenth pin of the main control chip IC1, a third port is externally connected with 12V voltage, the resistor R5 is connected between the third port and a fourth port, the fourth port is simultaneously connected with a collector of the triode Q6, and fifth to eighth ports are connected to an interface provided by the connecting piece U7 and connected with a last three-phase lead of the motor; the emitter of the triode Q6 is grounded, and the base is connected to the thirteenth pin of the main control chip IC1 after being connected to the resistor R7.

5. The motor driver circuit according to claim 4, wherein the over-current detection circuit comprises a first over-current detection circuit and a second over-current detection circuit, the first over-current detection circuit comprises a comparator IC2A, resistors R21, R23, R24, R20, R19, RS1 and capacitors C14, C13, one end of the resistor R19 is connected to a positive input terminal of the comparator IC2A, and the other end is used as the node F _ O of the first over-current detection circuit; the positive input end of the comparator IC2A is also connected in series with the resistor R20 and then grounded; one end of the resistor RS1 is grounded, and the other end of the resistor RS1 is connected in series with the resistor 19 and then is connected with the positive input end of the comparator IC 2A;

one end of the resistor R24 is grounded, and the other end of the resistor R24 is connected with the negative input end of the comparator IC 2A; the resistor R23 is connected between the output terminal and the negative input terminal of the comparator IC 2A; the output end of the comparator IC2A is connected in series with the resistor R21 and then is connected to the third pin of the main control chip IC1, and the output end of the comparator IC2A is also connected with the capacitor C14 and then is grounded; one end of the capacitor C13 is connected with a pull-up voltage supply end of the comparator IC2A, and the other end of the capacitor C13 is grounded; the pull-down voltage supply terminal of the comparator IC2A is connected to ground.

6. The motor driver circuit of claim 5, wherein the second over-current detection circuit comprises a comparator IC2B, resistors R25, R27 and R28, and capacitors C15 and C16, a positive input terminal of the comparator IC2B is connected with the resistor R27 and then grounded, and is connected with the resistor R25 and then externally connected with 5V voltage; one end of the resistor R28 is connected with the negative input end of the comparator IC2B, and the other end of the resistor R28 is used as the ground F _ O of the second overcurrent detection circuit; the negative input of the comparator IC2B is connected with the capacitor C16 and then grounded; the output end of the comparator IC2B is connected with the eleventh pin of the main control chip IC1 and the capacitor C15 and then is grounded.

7. The motor driver circuit as claimed in claim 5 or 6, wherein the three-phase Hall sensor circuit comprises Hall sensors H1, H2, H3, resistors R22, R26, R29 and capacitors C19, C18 and C17, the VDD terminals of the Hall sensors H1, H2 and H3 are connected with 5V voltage, and the GND terminal is grounded; the resistor R22 is connected between the VDD end and the OUT end of the Hall sensor H1, the capacitor C19 is connected between the OUT end and the GND end of the Hall sensor H1, and the OUT end of the Hall sensor H1 is connected with a first pin of the main control chip IC 1;

the resistor R26 is connected between the VDD end and the OUT end of the Hall sensor H2, the capacitor C18 is connected between the OUT end and the GND end of the Hall sensor H2, and the OUT end of the Hall sensor H2 is connected with the twentieth pin of the main control chip IC 1;

the resistor R29 is connected between the VDD end and the OUT end of the Hall sensor H3, the capacitor C17 is connected between the OUT end and the GND end of the Hall sensor H3, and the OUT end of the Hall sensor H3 is connected with a tenth pin of the main control chip IC 1.

8. The motor driver circuit according to claim 7, wherein the forward/reverse rotation control circuit comprises resistors R8 and R10 and a capacitor C9, one end of the resistor R8 is connected to an ac input, and the other end of the resistor R8 is connected in series with the resistor R10, then grounded and connected to a twelfth pin of the main control chip IC 1; one end of the capacitor C9 is connected with the twelfth pin of the main control chip IC1, and the other end is grounded.

9. The motor driver circuit according to claim 1 or 8, further comprising an input rectifying circuit and an input filter circuit, wherein the input rectifying circuit comprises an ac output connection P1, a zener diode D1, diodes D2, D4, D3 and D5, a cathode of the diode D2 is connected to a cathode of the diode D4, an anode of the diode D4 is connected to a cathode of the diode D5, an anode of the diode D5 is connected to an anode of the diode D3, a cathode of the diode D3 is connected to an anode of the diode D2, and the diodes D2, D4, D5 and D2 are connected end to form a diode loop; the first interface provided by the AC output connection P1 is connected at node A of the diode loop and the second interface provided by the AC output connection P1 is connected at node B of the diode loop; the anode of the zener diode D1 is connected to the second interface of the ac output connector P1, the cathode of the zener diode D1 is connected to the first interface of the ac output connector P1, and the ac power output by the ac output connector P1 is rectified by the rectifier circuit and then outputs dc power VCC from the node C of the diode loop; the node D of the diode loop is grounded;

the input filter circuit comprises capacitors C1 and C2, one end of the capacitor C2 is connected with the direct current VCC, the other end of the capacitor C2 is grounded, and the capacitor C1 is connected in parallel with two ends of the capacitor C2;

the N + P tubes Q1, Q2 and Q3 adopt MOS tubes with the model number of AM 4545C;

the comparator IC2A and the comparator IC2B are model SGM 8632.

10. A built-in driver for a motor built in the motor, wherein the driver is provided with a motor driver circuit according to any one of claims 1 to 9.

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