High-reliability motor driver with self-locking function

Abstract

The utility model relates to a motor driver, in particular to a high-reliability motor driver with a self-locking function, which is characterized in that a circuit included in the driver is formed by constructing hardware components, the speed regulation and the forward and reverse rotation control of a motor are realized, and the driver has the self-locking function of PWM (Pulse-Width Modulation) high level and low level at the same time; the control circuit of the motor is built through hardware components, the hardware circuit is not easily interfered by factors such as strong electromagnetism compared with program control, different modules of the circuit are electrically connected separately, and the circuit is provided with a PWM self-locking circuit, so that negative effects caused by uncertain states in the power-on initialization process are prevented, and when the circuit is partially damaged or upgraded, the reliability of the circuit is improved. Components or components can be replaced more easily, and high flexibility is achieved. The circuit comprises a precise secondary power supply circuit which can carry out automatic voltage reduction on an external power supply and provide a power supply required by the control circuit without providing an external independent isolation power supply, so that the cost of the control system is effectively reduced, and the space volume of the control system is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high reliability brushless motor driver especially relates to a kind of high reliability motor driver with self-locking function, realize the rotation reverse control of brushless motor, and with self-locking function guarantee in the case where PWM is high level or low level guarantee motor does not rotate, prevent PWM suspension or brushless motor fly car in control system initialization process. BACKGROUND

[0002] With the continuous progress of science and technology, various types of motor become indispensable in production and life. Among them, brushless motor is widely used in servo system due to its high reliability, long service life and other characteristics, and the occasions requiring brushless motor control device are also increasing.

[0003] At present, the existing brushless motor driver in the market is mostly controlled by embedded central processing unit (CPU). During the initialization process of the processor or mode switching, it will output an indefinite level, which will cause the brushless motor to rotate and fly. SUMMARY

[0004] The utility model provides a kind of high reliability motor driver with self-locking function, realize the rotation reverse control of brushless motor, and with self-locking function guarantee in the case where PWM is high level or low level guarantee motor does not rotate, greatly increase the reliability and system compatibility of brushless motor control.

[0005] To achieve the above purpose, the utility model provides a kind of high reliability motor driver with self-locking function, including hall signal capture circuit, precision secondary power supply circuit, positive and negative rotation three-phase six-state logic conversion circuit, PWM self-locking circuit, half-bridge interlocking drive circuit, self-recovery overcurrent protection circuit and three-phase bridge MOS power amplifier circuit;

[0006] The precision secondary power supply circuit generates the internal secondary power supply and the hall power supply of the driver; the input end of the hall signal capture circuit receives the hall position electric signal of the motor, and the three-phase six-state logic conversion circuit input end connects the hall signal capture circuit to complete the positive and negative rotation conversion of the motor and speed control; the PWM self-locking circuit realizes the identification of PWM signal high level and low level and generates a protection signal to ensure that the motor does not work; the input end of the self-recovery overcurrent protection circuit connects the current collection signal of the bridge power amplifier circuit (three-phase bridge MOS power amplifier circuit) for emergency protection when overcurrent occurs; the half-bridge interlocking drive circuit generates the driving signal of the three-phase bridge MOS power amplifier circuit in combination with the logic signal generated by the three-phase six-state logic conversion circuit and the PWM self-locking circuit; the three-phase bridge MOS power amplifier circuit receives the driving signal generated by the half-bridge interlocking drive circuit, and the output end is electrically connected to the motor.

[0007] The input end of the precision secondary power supply circuit is electrically connected with an external power supply, and the output end of the precision secondary power supply circuit is electrically connected with the Hall signal acquisition circuit, the PWM self-locking circuit, the three-phase six-state logic conversion circuit and the half-bridge interlocking drive circuit, respectively.

[0008] The input end of the self-recovery overcurrent protection circuit is electrically connected with the output end of the three-phase bridge MOS power amplification circuit, and the output end of the self-recovery overcurrent protection circuit is electrically connected with the input end of the three-phase six-state logic conversion circuit.

[0009] Optionally, the input end of the PWM self-locking circuit receives an external PWM signal, the input end of the three-phase six-state logic conversion circuit receives a Hall acquisition signal, a DIR signal and the output end of the PWM self-locking circuit, and the output end of the half-bridge interlocking drive circuit is electrically connected with the input end of the three-phase bridge MOS power amplification circuit.

[0010] Optionally, the voltage output by the first output end of the precision secondary power supply circuit is 12V, and the voltage output by the second output end of the precision secondary power supply circuit is 5V.

[0011] Compared with the prior art, the above technical solution of the utility model has the following advantages:

[0012] The high-reliability motor driver with the self-locking function provided by the utility model realizes the rotation and reverse rotation control of the brushless motor, has the self-locking function to ensure that the motor does not rotate in the case that the PWM is high or low, greatly increases the reliability and system compatibility of the brushless motor control, and avoids the damage of the equipment caused by the flying car and even causes accidents.

[0013] The high-reliability motor driver with self-locking function comprises a precise secondary power supply circuit, a Hall signal capture circuit, a three-phase six-state logic conversion circuit, a PWM self-locking circuit, a half-bridge interlocking driving circuit, a self-recovery overcurrent protection circuit and a three-phase bridge MOS power amplification circuit; the precise secondary power supply circuit generates a secondary power supply inside the driver and a Hall power supply; the input end of the Hall signal capture circuit receives a Hall position electric signal of the motor, and the input end of the three-phase six-state logic conversion circuit is connected to the Hall signal capture circuit to complete forward and reverse conversion and speed control of the motor; the PWM self-locking circuit realizes identification of high and low levels of a PWM signal and generates a protection signal to ensure that the motor does not work; the input end of the self-recovery overcurrent protection circuit is connected to a current collection signal of the bridge power amplifier circuit for emergency protection when overcurrent occurs; the half-bridge interlocking driving circuit generates a logic signal of the three-phase six-state logic conversion circuit and the PWM self-locking circuit, and generates a driving signal of the three-phase bridge power amplifier; and the three-phase bridge MOS power amplification circuit receives the driving signal generated by the half-bridge interlocking driving circuit and is electrically connected to the motor at the output end.

[0014] The utility model discloses to solve the problem of high-speed rotation of the controlled motor when the PWM is high and low in the prior art, the circuit contained in the driver is built by hardware components, realizes the control of motor speed and positive and negative rotation, and has the self-locking function of PWM high and low level. The motor driven by the driver can be a brushless motor, or other types of motors that can use the motor control circuit. The utility model builds the control circuit of motor through hardware components, and the hardware circuit is not easy to be disturbed by strong electromagnetic factors relative to program control. The electrical connection between different modules of the circuit is discrete, and has a PWM self-locking circuit. When the positive and negative rotation control of the brushless motor is realized, the self-locking function ensures that the motor does not rotate when the PWM is high or low, prevents the brushless motor from flying during PWM suspension or control system initialization, prevents the negative effects caused by the undefined state during power-on initialization, and is more easily replaced when the circuit is damaged or upgraded. The circuit contains a precise secondary power supply circuit, which can self-buck the external power supply and provide the power supply required by the control circuit itself, without the need for an external separate isolation power supply, effectively reducing the cost of the control system and saving the space volume of the control system. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present utility model and, together with the description, serve to explain the principles of the present utility model.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0017] Figure 1 The structural electrical connection schematic diagram of the motor drive with high reliability and self-locking function provided in the embodiments of the present application is shown in the figure.

[0018] Figure 2 The structural electrical connection schematic diagram of the Hall signal capture circuit provided in the embodiments of the present application is shown in the figure. Figure 2 - (1), 2- (2) and 2- (3) are three-phase windings A, B and C of the motor respectively.

[0019] Figure 3 The structural electrical connection schematic diagram of the DIR signal and PWM signal input interface circuit provided in the embodiments of the present application is shown in the figure.

[0020] Figure 4 The structural electrical connection schematic diagram of the single-PWM speed regulation circuit provided in the embodiments of the present application is shown in the figure. Figure 4 - (1) is a circuit for amplifying the PWM signal to generate a PWM1 signal, Figure 4 - (2) is a circuit for generating a PWM2 signal based on the PWM1 signal, Figure 4 - (3) is a circuit for generating a PWM3 signal based on the PWM3 signal, Figure 4 - (4) is a circuit for generating a TC-5V signal based on the PWM3 signal.

[0021] Figure 5 The structural electrical connection schematic diagram of the forward and reverse three-phase six-state logic conversion circuit provided in the embodiments of the present application is shown in the figure.

[0022] Figure 6 The structural electrical connection schematic diagram of the half-bridge interlocking drive circuit provided in the embodiments of the present application is shown in the figure. Figure 6 - (1), 6- (2) and 6- (3) are half-bridge interlocking drive circuits of the three windings of the motor respectively.

[0023] Figure 7 The structural electrical connection schematic diagram of the power supply circuit provided in the embodiments of the present application is shown in the figure. Figure 7 - (1), Figure 7 - (2) are circuits for outputting +12V and +5V respectively.

[0024] Figure 8The utility model discloses a self -restoring overcurrent protection circuit structure electric connection schematic diagram provided in the embodiment of the utility model,

[0025] Figure 9 The utility model discloses a three -phase bridge MOS power amplification circuit structure electric connection schematic diagram provided in the embodiment of the utility model. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantage of the embodiment of the utility model more clear, the technical scheme in the embodiment of the utility model will be described clearly and completely below with the drawings in the embodiment of the utility model, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of the utility model protection.

[0027] In the drawings of the utility model, relevant mark explanation is as follows: R-Resistance, C-Capacitor, GND-Ground, U-integrated circuit, D-diode, Q-MOS tube, IN-input, OUT-output, IN+-op-amp positive terminal input, IN--op-amp negative terminal input, +12V-12V power supply, V5V-5V power supply, NC-empty foot, VB-bridge bootstrap voltage positive terminal, Vs-bridge bootstrap voltage negative terminal, HIN-logic high input end, LIN-logic low input end, HO-bridge drive output end, LO-bridge drive output end, HA1 / HB1 / HC1-Hall signal input end, DIR-direction control end, U_H / V_H / W_H-bridge logic output end, U_L / V_L / W_L-bridge logic input end, H1 / H2 / H3-bridge logic input end, L1 / L2 / L3-bridge logic input end, OCP-overcurrent protection input end, PTC overcurrent protection output end.

[0028] The utility model discloses a kind of high reliability motor driver with self-locking function contained in the circuit provided in the embodiment of the utility model, is built by hardware component, realizes to motor speed regulation and positive rotation control, simultaneously with the self-locking function of PWM high level and low level.The motor driven by the driver can be brushless motor, can also be other types of motor using the motor control circuit.The protection scope of the utility model is not limited to the motor type of motor control circuit action.

[0029] In one embodiment, a high-reliability motor driver with a self-locking function is provided. The internal parts of the brushless motor driver are electrically connected as shown in Figure 1 The motor control circuit controls the speed of the motor 100.

[0030] As Figure 1 shown, the high reliability motor driver with self-locking function comprises a Hall signal capture circuit 101 (Hall acquisition circuit), a PWM self-locking circuit 102, a three-phase six-state logic conversion circuit 103, a half-bridge interlocking drive circuit 104, a precision secondary power supply circuit 105, a three-phase bridge MOS power amplification circuit 106, and a self-recovery overcurrent protection circuit 107. The input end of the Hall signal capture circuit 101 receives an electrical signal for controlling the motor 100 (brushless motor), and the output end of the Hall signal capture circuit 101 is electrically connected to the three-phase six-state logic conversion circuit 103. The input end of the DIR input interface and the input end of the PWM self-locking circuit 102 are respectively electrically connected to the control signal DIR for controlling the direction and the speed control signal PWM. The output end of the DIR input interface and the output end of the PWM self-locking circuit 102 are electrically connected to the three-phase six-state logic conversion circuit 103. The output end of the three-phase six-state logic conversion circuit 103 is electrically connected to the half-bridge interlocking drive circuit 104. The output end of the half-bridge interlocking drive circuit 104 is electrically connected to the three-phase bridge MOS power amplification circuit 106. The input end of the self-recovery overcurrent protection circuit 107 is electrically connected to the three-phase bridge MOS power amplification circuit 106. The output end of the self-recovery overcurrent protection circuit 107 is electrically connected to the three-phase six-state logic conversion circuit 103. The power supply of the Hall signal capture circuit 101, the PWM self-locking circuit 102, the three-phase six-state logic conversion circuit 103, the half-bridge interlocking drive circuit 104, the three-phase bridge MOS power amplification circuit 106, and the self-recovery overcurrent protection circuit 107 is connected to the precision secondary power supply circuit 105.

[0031] In this embodiment, the electrical signal for controlling the motor 100 received by the Hall signal capture circuit 101 can be an electrical signal formed by an automatic device or an electrical signal generated after being adjusted by a person. The protection scope of the utility model is not limited by the generation mode of the electrical signal for controlling the motor 100.

[0032] The PWM self-locking circuit 102 of the high reliability motor driver with self-locking function receives an external speed control signal PWM, performs self-locking judgment, generates a protection signal when the high level / low level is guaranteed, prevents the motor from flying, and transmits the converted PWM signal to the three-phase six-state logic conversion circuit 103 for motor control.

[0033] The input end of the three-phase six-state logic conversion circuit 103 of the high reliability motor driver with self-locking function is electrically connected to the output end of the Hall signal capture circuit 101 and the PWM self-locking circuit 102. The output end of the three-phase six-state logic conversion circuit 103 is electrically connected to the input end of the half-bridge interlocking drive circuit 104.

[0034] The input end of the half-bridge interlocking drive circuit 104 of the motor driver with self-locking function and high reliability is electrically connected to the output end of the three-phase six-state logic conversion circuit 103; the output end of the half-bridge interlocking drive circuit 104 is electrically connected to the three-phase bridge MOS power amplification circuit 106.

[0035] The input end of the self-recovery overcurrent protection circuit 107 of the motor driver with self-locking function and high reliability is electrically connected to the sampling resistor of the three-phase bridge MOS power amplification circuit 106, and the output end of the self-recovery overcurrent protection circuit 107 is electrically connected to the input end of the three-phase six-state logic conversion circuit 103.

[0036] In one embodiment, as shown in Figure 2 , the Hall signal capture circuit 101 of the motor driver with self-locking function and high reliability realizes the related functions through Figure 2 components and electrical connection modes, Figure 2 , and Figure 2 - (1), 2- (2) and 2- (3) are the three-phase windings A, B and C of the motor, wherein HA1, HB1 and HC1 represent the Hall signal input end, HA, HB and HC represent the Hall signal output end, R8, R9, R12, R13, R14 and R15 represent different resistors, C7, C8 and C9 represent different capacitors, D2, D3 and D4 represent zener diodes, +12V represents +12V voltage generated by a precision secondary power supply, and terminals with the same internal label are electrically connected. The position of the rotor is detected through these Hall signals, thereby controlling the operation of the motor. A noise suppression unit composed of a zener diode and a capacitor is provided at the end of each winding Hall signal capture circuit, such as Figure 2 , which is composed of capacitor C7 and zener diode D2 in (1).

[0037] In one embodiment, as shown in Figure 3 , the input interface circuit of the DIR signal realizes the related functions through Figure 3 components and electrical connection modes, wherein U1-1 represents a DIR signal isolation optocoupler, R2 and R17 represent different resistors, C6 represents a capacitor, and DIR and DIRX are the labels of the signal output terminals. The PWM signal also uses this input interface circuit to realize signal input, and the isolation optocoupler can isolate interference signals.

[0038] In one embodiment, as shown in Figure 4 , the PWM self-locking circuit 102 realizes the related functions through Figure 4The components in the PWM self-locking circuit and the electrical connection mode realize the related functions. The PWM self-locking circuit amplifies the input PWM signal through an operational amplifier, and then forms a high level or low level self-locking protection through three AND gate circuits connected in series. Among them, U6, U7 and U17 respectively represent different AND gate circuits, U8 represents an operational amplifier, R22, R23, R25, R30, R33 and R21 respectively represent different resistors, C27, C18, C20, C24, C23, C54 and C53 respectively represent different capacitors, PWM, PWM1, PWM2, PWM3 and TC-5V respectively represent the labels of different terminals, and the terminals with the same internal label are electrically connected. The PWM signal can produce driving signals PWM1, PWM2 and PWM3 after passing through the PWM self-locking circuit 102. When PWN is high or low (here, high or low refers to a signal without level change), the self-locking protection signal (TC-5V signal) is generated after passing through the PWM self-locking circuit 102, which promotes the three-phase six-state logic conversion circuit 103 to not produce the driving signal for motor rotation.

[0039] In one embodiment, as shown in Figure 5 , the three-phase six-state logic conversion circuit 103 realizes the related functions through the components in Figure 5 and the electrical connection mode.

[0040] The input end of the three-phase six-state logic conversion circuit 103 includes three-way Hall output signals of the Hall signal capture circuit, PWM output signals of the PWM self-locking circuit, and PTC and DIRX as the common input end through the overcurrent protection output end and the direction control end. The end of the three-phase six-state logic conversion circuit 103 is provided with six rear-end AND gates. The input signals of the three-phase six-state logic conversion circuit 103 are electrically connected to the six rear-end AND gates through multiple logic units, which are used to output the logic driving voltage of the three-phase motor.

[0041] The signal (from the current sensor) of the overcurrent protection output end PTC and the control signal DIRX of the control direction are used as the common input end of the three-phase six-state logic conversion circuit 103, and the end of the three-phase six-state logic conversion circuit 103 is provided with six rear-end AND gates for outputting the logic driving voltage of the three-phase motor; the common input end is electrically connected to the first three AND gates in the six rear-end AND gates through an AND gate after being connected to the PWM3 signal, and the Hall output signals HA, HB and HC are respectively outputted after being connected to the common input end through an XOR gate, and the three XOR gates respectively output two paths, one of which is directly electrically connected to two AND gates in the six rear-end AND gates, and the other is electrically connected to two AND gates in the six rear-end AND gates through a NOT gate. The output signals of the six rear-end AND gates at the end are U H, U L, V H, V L, W H and W L respectively, that is, the three-phase motor three-phase input voltage is controlled. The signal (from the current sensor) of the overcurrent protection output end PTC and the control signal DIRX of the control direction are used as the input signals of the delay flip-flop for delay control, to ensure the stability and accuracy of the motor control signal.

[0042] In one embodiment, as shown in Figure 6 the half-bridge interlocking drive circuit 104 realizes the related functions through the components and electrical connection modes in Figure 6 , wherein U1-2, U2 and U3-2 represent gate drive integrated circuits; D1, D2 and D3 represent different fast recovery diodes, C1, C2 and C3 represent different capacitors; H1, H2, H3, L1, L2, L3, U H, V H, W H, U L, V L and W L are the labels of different terminals. Figure 6 (1), 6- (2), 6- (3) are the half-bridge interlocking drive circuits of the three windings of the motor, and the speed and direction of the motor are controlled through the half-bridge interlocking drive circuit 104.

[0043] U / V / W represent the three-phase power input end, which is used for input to the three windings of the motor; U H / V H / W H are the upper bridge logic output ends, U L / V L / W L are the lower bridge logic output ends, H1 / H2 / H3 are the upper bridge logic input ends, L1 / L2 / L3 are the lower bridge logic input ends, and the upper bridge logic output ends U H / V H / W H and the lower bridge logic output ends U L / V L / W L output the logic control signals from the three-phase six-state logic conversion circuit 103, which are used to provide the logic control signals for the half-bridge interlocking drive circuit 104. The upper bridge logic input ends H1 / H2 / H3 and the lower bridge logic input ends L1 / L2 / L3 are respectively used for input to the power amplifier circuit of the three windings of the motor.

[0044] In one embodiment, as shown in Figure 7As shown, the precision secondary power supply circuit 105 realizes the relevant functions through the components and electrical connection forms in Figure 7 . Among them, U4-2, U16 represent power processing integrated circuits, R1, R2-1, R3, R47, R48 represent different resistors respectively, D4, D5 represent different voltage stabilizing diodes respectively, constitute the peripheral circuits of the two power processing integrated circuits, and GND represents ground. The +28V external power supply is input to the precision secondary power supply circuit 105 in Figure 7 , and the processed +12V and +5V voltages can be obtained. Figure 7 - (1), and Figure 7 - (2) are circuits for outputting +12V and +5V respectively.

[0045] In this embodiment, as shown in Figure 8 , the self-restoring overcurrent protection circuit 107 realizes the relevant functions through the components and electrical connection forms in Figure 8 . Among them, U3-1, U4-1 represent different operational amplifier circuits respectively, the self-restoring overcurrent protection circuit obtains the overcurrent protection output signal by two-stage amplification of the current collection output signal through the two operational amplifier circuits, R4, R11, R5, R6, R10, R19, R3-1, R7, R18 represent different resistors respectively, C1, C2, C3, C10, C11, C12 represent different capacitors respectively, D1 represents a voltage stabilizing diode, and OCP, OCP_1, PTC, PTC1 are terminal designations. The OCP terminal is connected with the current sampling signal of the three-phase bridge MOS power amplification circuit, PTC is the overcurrent protection output signal, and OCP_1 is the current collection output signal.

[0046] In this embodiment, as shown in Figure 9 , the three-phase bridge MOS power amplification circuit 106 realizes the relevant functions through the components and electrical connection forms in Figure 9 . The three-phase bridge MOS power amplification circuit controls six MOS tubes to supply power to the motor by receiving the driving signal of the half-bridge interlocking driving circuit, and sets current sampling resistors to sample the currents of the three windings of the motor.

[0047] Among them, Q1, Q2, Q3, Q4, Q5, Q6 represent different MOS tubes respectively; R4-1, R5-1, R6-1, R7-1, R8-1, R9-1, R10-1, R11-1, R12-1, R13, R14, R15, R16, R17-1, R18-1, R19-1, R20 represent different resistors respectively, among which R8-1, R9-1, R14-1, R15-1, R16 are current sampling resistors, and the OCP terminal is connected with the input end of the self-restoring overcurrent protection circuit 107.

[0048] In this embodiment,Figures 2 to 9 In the embodiment, all the terminals marked with "+12V" are electrically connected to the +12V output terminal of the internal power supply unit 105, and all the terminals marked with "+5V" are electrically connected to the +5V output terminal of the internal power supply unit 105. Figures 2 to 9 In the embodiment, the numbers marked beside the pins of the integrated circuits U1-1, U2,..., etc. are the pin numbers of the integrated circuits, for example, the number "1" in the upper left corner of U1-1 represents the first pin of U1-1, and so on.

[0049] The motor driver with the self-locking function and high reliability provided by the embodiment of the utility model, through hardware component builds the drive circuit of motor 100, the circuit relative to other drive circuits, will not cause the motor to lose control and fly because of power-on initialization, voltage instability, PWM signal is high level or low level or position constant voltage level, make the motor out of control. The electrical connection between different modules of the circuit is discrete, when the circuit part is damaged or upgraded, it is easier to replace components or components, and it has very high flexibility. The circuit contains a precision secondary power supply circuit 105, which can self-buck the external power supply and provide the power required by the control circuit itself, without the need for an external separate isolation power supply, effectively reducing the cost of the control system and saving the space volume of the control system.

[0050] The driver provides two different voltage levels of power supply through the precision secondary power supply circuit 105 and the precision power supply, which can supply power to the Hall of the brushless motor 100, and can also be used to realize other related functions, while saving the space volume of the control circuit, it can also improve the flexibility of the motor driver.

[0051] The anti-self-restoring overcurrent protection circuit 107 detects the bus current, which can be used for internal protection, and simultaneously outputs a voltage signal proportional to the current for external monitoring. The self-restoring function does not stop after the motor 100 protection caused by motor 100 overspeed and overcurrent, further improving the reliability of the motor control circuit and the motor 100 during operation.

[0052] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by“comprises...” does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0053] The foregoing merely illustrates the principles of the application and various modifications can be devised by those skilled in the art without departing from the spirit or scope of the application. The embodiments described hereinabove are illustrative aspects and it is understood that the following claims are to cover all generic and unique features of the application described herein. Accordingly, many modifications can be made by those skilled in the art without departing from the spirit or scope of the application. Therefore, the scope of the application is to be interpreted only in conjunction with the appended claims and their legal equivalents.

Claims

1. A high-reliability motor driver with self-locking function, characterized in that, The motor control circuit comprises a precision secondary power supply circuit, a Hall signal capture circuit, a three-phase six-state logic conversion circuit, a PWM self-locking circuit, a half-bridge interlocking drive circuit, a self-recovery overcurrent protection circuit and a three-phase bridge MOS power amplification circuit. An input end of the PWM self-locking circuit is electrically connected to a PWM signal used for motor speed control. An input end of the self-recovery overcurrent protection circuit receives a signal of the three-phase bridge MOS power amplification circuit. An input end of the precision secondary power supply circuit is electrically connected to an external power supply, and output ends of the precision secondary power supply circuit are respectively electrically connected to the Hall signal capture circuit, the PWM self-locking circuit, the three-phase six-state logic conversion circuit and the half-bridge interlocking drive circuit. An input end of the three-phase six-state logic conversion circuit receives input signals of the Hall signal capture circuit, the PWM self-locking circuit and the self-recovery overcurrent protection circuit, and an output end of the three-phase six-state logic conversion circuit is electrically connected to the half-bridge interlocking drive circuit to generate a logic control signal used for motor forward and reverse rotation.

2. The high-reliability motor driver with self-locking function according to claim 1, characterized in that, The Hall signal capture circuit comprises three-phase winding Hall signal capture circuits of a motor, and each three-phase winding Hall signal capture circuit is respectively provided with a Hall signal input end and a Hall signal output end.

3. The high-reliability motor driver with self-locking function according to claim 1, characterized in that, The precision secondary power supply circuit processes an input of +28V external power supply through two power supply processing integrated circuits and their peripheral circuits to obtain +12V and +5V voltages.

4. The high reliability motor driver with self-locking function according to claim 1, characterized in that, The self-recovery overcurrent protection circuit processes a current collection output signal through two operational amplifier circuits to obtain an overcurrent protection output signal.

5. The high reliability motor driver with self-locking function according to claim 1, characterized in that, The PWM self-locking circuit processes an input PWM signal through an operational amplifier to amplify the input PWM signal, and then processes the amplified PWM signal through three AND gate circuits connected in series to form a high level or a low level self-locking protection.

6. The high reliability motor drive with self-locking function according to claim 1, characterized in that, The input end of the three-phase six-state logic conversion circuit comprises three Hall output signals of the Hall signal capture circuit and a PWM output signal of the PWM self-locking circuit, and the three-phase six-state logic conversion circuit further comprises an overcurrent protection output end and a direction control end as common input ends, six rear-end AND gates are arranged at the end of the three-phase six-state logic conversion circuit, and input signals of the three-phase six-state logic conversion circuit are electrically connected to the six rear-end AND gates through a plurality of logic units to output three-phase logic drive voltages of the motor.

7. The high reliability motor driver with self-locking function according to claim 1, characterized in that, The three-phase bridge MOS power amplification circuit controls six MOS transistors through a drive signal of the half-bridge interlocking drive circuit to supply power to the motor, and a current sampling resistor is arranged to sample currents of three windings of the motor.

Images