CN113131796B - Starting or anti-blocking method of direct current brush motor - Google Patents

Starting or anti-blocking method of direct current brush motor Download PDF

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Publication number
CN113131796B
CN113131796B CN201911401634.7A CN201911401634A CN113131796B CN 113131796 B CN113131796 B CN 113131796B CN 201911401634 A CN201911401634 A CN 201911401634A CN 113131796 B CN113131796 B CN 113131796B
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current
time
switch tube
mos switch
side mos
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CN113131796A (en
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张长洪
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SG Micro Beijing Co Ltd
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SG Micro Beijing Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/18—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual dc motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/10—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for preventing overspeed or under speed
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/40—Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load

Abstract

According to the starting or anti-blocking method of the direct current brush motor, the working current is modulated through the PWM control module on the basis of the traditional overcurrent protection period, so that load current exists in the process of each current slowly attenuating the previous half period, and the load current is stabilized at the modulation current threshold value, namely, safe and constant starting torque can still be provided for the direct current brush motor; in the later half period of each fast current attenuation, PWM modulation is not carried out, and the direct current brush motor loses the driving torque and slides freely; the method realizes the cyclic action of '… start-slide-start …' of the direct current brush motor, and the two modes are switched at intervals, so that the winding coil of the direct current brush motor shakes, and further, the rotation inertia is generated, on one hand, the rotation inertia weakens the static moment of the direct current brush motor, on the other hand, the rotation inertia adds the constant start moment of the direct current brush motor, and finally, the safe start of the direct current brush motor is realized.

Description

Starting or anti-blocking method of direct current brush motor
Technical Field
The invention relates to a driving technology of a direct current brush motor, in particular to a starting or anti-blocking method of the direct current brush motor.
Background
Fig. 1 is a schematic diagram of an H-bridge driving circuit of an H-bridge driver driving a dc brushed motor, the dc brushed motor is simplified into an inductive load LR, in the H-bridge driving circuit, drains of a first high-side PMOS switch M1 and a third low-side NMOS switch M3 are connected to a first node a, a second high-side PMOS switch M2 and a fourth low-side NMOS switch M4 are connected to a second node B, one end of the inductive load is connected to the first node a, and the other end is connected to the second node B, wherein D1, D2, D3, and D4 are parasitic diodes of the first high-side PMOS switch M1, the second high-side PMOS switch M2, the third low-side NMOS switch M3, and the fourth low-side NMOS switch M4, respectively. In addition to the H-bridge driving circuit shown in fig. 1, the circuit for driving the dc brushed motor to operate by the H-bridge driver further includes a conventional overcurrent protection circuit. Fig. 2 shows a working timing diagram of a conventional overcurrent protection circuit of a conventional H-bridge-driven dc brushed motor, where vsg1 and vsg2 respectively correspond to source-gate voltage difference waveforms of on and off of a first high-side PMOS switch tube M1 and a second high-side PMOS switch tube M2, vgs3 and vgs4 respectively correspond to gate-source voltage difference waveforms of on and off of a third low-side NMOS switch tube M3 and a fourth low-side NMOS switch tube M4, and I1 corresponds to a detected change diagram of a current flowing through a winding coil of the dc brushed motor. Specifically, the detected current flowing through the coil winding of the dc brush motor is a working current Iload, and the H-bridge driving circuit is used to drive the dc brush motor to work, for example, when the first high-side PMOS switch tube M1 and the fourth low-side NMOS switch tube M4 are turned on, if the detected working current Iload is greater than or equal to an overcurrent protection threshold Iocp set by the conventional overcurrent protection circuit and the duration exceeds an overcurrent protection start time Tdeg (ocp Deglitch time), the conventional overcurrent protection circuit immediately operates, and the overcurrent protection start time Tdeg is typically several microseconds. The traditional overcurrent Protection circuit immediately turns off all the first high-side PMOS switching tube M1, the second high-side PMOS switching tube M2, the third low-side NMOS switching tube M3 and the fourth low-side NMOS switching tube M4 through the switching tube control unit, so that the H-bridge driving circuit is in a high-resistance Protection state, the duration of the high-resistance Protection state is an overcurrent Protection interval time Tocp (Over-Current Protection Period), which is generally several milliseconds, to quickly attenuate the working Current Iload, which is a first traditional overcurrent Protection Period Φ 1. The dc brush motor loses the driving torque during the over-current protection interval Tocp. When the first traditional overcurrent protection period phi 1 is finished, continuing to try to normally drive the direct-current brush motor to work by using the H-bridge drive circuit and detecting whether the working current Iload exceeds the overcurrent protection threshold value Iocp and whether the duration time exceeds the overcurrent protection starting time Tdeg, and if so, continuing to enable the H-bridge to be in a high-resistance protection state and continue the overcurrent protection interval time Tocp by using the traditional overcurrent protection circuit; this is the second conventional overcurrent protection period Φ 2. And circulating the overcurrent detection process and the high-resistance protection state process, namely, the overcurrent detection process and the high-resistance protection state process are a traditional overcurrent protection period, the time of the traditional overcurrent protection period is Tdeg + Tocp, and the circulation is stopped unless the value of the working current Iload of the direct-current brush motor is lower than the overcurrent protection threshold value Iocp. When the DC brush motor is started or locked, because the winding coil is static, under the condition of no reverse electromotive force to inhibit the current of the winding coil, the static moment of a winding coil needs to be overcome to do work, at the moment, the starting current or the locked-rotor current Iload flowing through the winding coil of the direct-current brush motor is extremely large and at least more than 1.5 times of the rated working current, the over-current protection circuit of the H-bridge driver is very easy to trigger to act, once the traditional over-current protection circuit of the H-bridge driver is triggered, the traditional over-current protection period is easy to enter, the traditional overcurrent protection makes the direct current brush motor more difficult to start, if the H bridge driver, the direct current brush motor model and the dragging load are not matched, the overcurrent detection and high-resistance protection states of the traditional overcurrent protection circuit can be infinitely circulated, namely, a dead cycle is entered, and the direct-current brush motor is locked and rotated and can not be started by itself.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for starting or anti-stalling a dc brushed motor, in which a pwm (pulse Width modulation) control module is used in a conventional overcurrent protection period in a crossed manner to realize a cyclic motion of "… start-sliding-start …" when the dc brushed motor is started or stalled, so that a winding coil of the dc brushed motor is shaken to generate rotational inertia, which weakens a static moment of the dc brushed motor on one hand and adds a constant start moment of the dc brushed motor on the other hand, thereby finally realizing safe start or safe operation of the dc brushed motor.
The invention is realized by the following technical scheme:
a starting or anti-blocking method of a direct current brush motor is characterized in that an H-bridge driving circuit is used for driving the direct current brush motor, the method further comprises a PWM control module, the PWM control module sets a modulation current threshold value and modulation current starting time, the maximum modulation current threshold value is not greater than an overcurrent protection threshold value, and the minimum modulation current threshold value is not less than the rated working current of the direct current brush motor;
when the motor is started or locked, if the PWM control module detects that the load current exceeds an overcurrent protection threshold value, the first time is continued from reaching the overcurrent protection threshold value, and the first overcurrent current detection stage is realized;
when the first time is over, the PWM control module closes the first high-side MOS switch tube and the second high-side MOS switch tube, and opens the third low-side MOS switch tube and the fourth low-side MOS switch tube, so that the load current is in a slow attenuation state and lasts for a second time, which is a first current slow attenuation stage;
if the motor rotor operates in the second time process, the H bridge is recovered to a normal starting state; if the second time is over and the motor rotor is still not running, the H-bridge driving circuit enters a normal starting state, the PWM control module detects the load current when the normal starting state starts, and when the load current exceeds the modulation current threshold and the duration exceeds the modulation current starting time, the normal starting state is started and the modulation current starting time is over, which is a second overcurrent detection stage; when the second overcurrent current detection stage is finished, the PWM control module immediately closes the first high-side MOS switching tube and the second high-side MOS switching tube, opens the third low-side MOS switching tube and the fourth low-side MOS switching tube, so that the load current is in a slow attenuation state and lasts for a second time, which is a second current slow attenuation stage; cyclically repeating the first overcurrent current detection phase and the first current slow decay phase until a third time is reached;
the first overcurrent current detection phase, the first current slow attenuation phase and the overall process of circularly repeating the first overcurrent current detection phase and the first current slow attenuation phase are half periods before current slow attenuation; the duration is the third time;
during the current slow decay pre-half cycle, the load current settles at the modulation current threshold;
if the motor rotor operates in the third time process, the H bridge is recovered to a normal starting state; if the third time is over, the motor rotor still does not operate, the PWM control module closes the first high-side MOS switch tube, the second high-side MOS switch tube, the third low-side MOS switch tube and the fourth low-side MOS switch tube and continues for a fourth time, and the H bridge is in a high-resistance state which is a later half cycle of fast current attenuation;
if the motor rotor operates in the fourth time process, the H bridge is recovered to a normal starting state; if the fourth time is over and the motor rotor still does not operate, circularly repeating the current slow attenuation front half period and the current fast attenuation rear half period until reaching the fifth time;
if the motor rotor operates in the fifth time process, the H bridge is recovered to a normal starting state; and if the fifth time is over and the motor rotor still does not operate, automatically closing the PWM control module.
Preferably, the first time is 2-8 microseconds.
Preferably, the second time is greater than the first time and less than 100 microseconds.
Preferably, the third time is 2 to 9 milliseconds.
Preferably, the fourth time is equal to the third time, and the first half period of the slow decay of the current and the second half period of the fast decay of the current together form a current decay period.
Preferably, the fifth time is the working time of the PWM control module, and the working time of the PWM control module is not greater than 10 seconds.
Preferably, the method for starting or anti-blocking the direct current brush motor further comprises a traditional overcurrent protection circuit, and if the PWM control module is automatically turned off, the traditional overcurrent protection circuit works.
Preferably, the method for starting or resisting rotation blockage of the direct current brush motor further comprises an over-temperature protection circuit, if the temperature of the H-bridge drive circuit exceeds a temperature protection threshold, the over-temperature protection circuit immediately controls the switch tube control unit to enable the first high-side MOS switch tube, the second high-side MOS switch tube, the third low-side MOS switch tube and the fourth low-side MOS switch tube to enter a high-resistance protection state, and a conventional over-current protection period is repeated in a circulating manner.
Compared with the prior art, the invention has the advantages that:
according to the starting or anti-blocking method of the direct current brush motor, the working current is modulated through the PWM control module on the basis of the traditional overcurrent protection period, so that load current exists in the process of each current slowly attenuating the previous half period, and the load current is stabilized at the modulation current threshold value, namely, safe and constant starting torque can still be provided for the direct current brush motor; in the later half period of each fast current attenuation, PWM modulation is not carried out, and the direct current brush motor loses the driving torque and slides freely; the method realizes the cyclic action of '… start-slide-start …' of the direct current brush motor, and the two modes are switched at intervals, so that the winding coil of the direct current brush motor shakes, and further, the rotation inertia is generated, on one hand, the rotation inertia weakens the static moment of the direct current brush motor, on the other hand, the rotation inertia adds the constant start moment of the direct current brush motor, and finally, the safe start of the direct current brush motor is realized. And in addition, the PWM control module is used for circularly modulating the working current in the process of each current slow attenuation front half period, and the temperature protection can be not triggered as far as possible on the basis of ensuring the starting torque by adjusting the modulation current threshold, so that the anti-blocking performance of the anti-blocking H-bridge driver for the direct-current brush motor is further improved. Once the over-temperature protection (TSD) is triggered, the attempt to start the dc brushed motor is immediately abandoned, i.e. the high-resistance protection state is immediately jumped, and only the process of the conventional over-current protection period is circularly repeated, so as to ensure the safety of the H-bridge driver and the dc brushed motor.
Drawings
FIG. 1 is a schematic diagram of an H-bridge driving circuit driving a DC brush motor;
FIG. 2 is a timing diagram of the operation of a conventional H-bridge driving circuit driving a DC brushed motor to trigger a conventional overcurrent protection circuit;
fig. 3 is a timing diagram of the operation of the H-bridge driving circuit driving the dc brush motor to trigger the PWM control module according to the present invention.
The various reference numbers in the figures are listed below:
m1-first high side PMOS switch tube, M2-second high side PMOS switch tube, M3-third low side NMOS switch tube, M4-fourth low side NMOS switch tube, A-first node, B-second node, LR-inductive load,
vsg 1-source gate voltage difference waveform when the first high side PMOS switch tube M1 is turned on and off in the conventional overcurrent protection period, vsg 2-source gate voltage difference waveform when the second high side PMOS switch tube M2 is turned on and off in the conventional overcurrent protection period, vgs 3-gate source voltage difference waveform when the third low side NMOS switch tube M3 is turned on and off in the conventional overcurrent protection period, vgs 4-gate source voltage difference waveform when the fourth low side NMOS switch tube M4 is turned on and off in the conventional overcurrent protection period, Il-load current change waveform in the conventional overcurrent protection period, Tdeg-overcurrent protection start time, Tocp-overcurrent protection interval time, Φ 1-first conventional overcurrent protection period, Φ 2-second conventional overcurrent protection period, Φ N-nth conventional overcurrent protection period, P1-PWM control module 1, vsg1 '-source-gate voltage difference waveform when a first high-side PMOS switch tube M1 is turned on and off in an overcurrent protection period with PWM, vsg 2' -gate-source voltage difference waveform when a second high-side PMOS switch tube M2 is turned on and off in the overcurrent protection period with PWM, vgs3 '-gate-source voltage difference waveform when a third low-side NMOS switch tube M3 is turned on and off in the overcurrent protection period with PWM, vgs 4' -gate-source voltage difference waveform when a fourth low-side NMOS switch tube M4 is turned on and off in the overcurrent protection period with PWM, I2-load current change waveform in the overcurrent protection period with PWM, T1-first time, T2-second time, T3-phi third time, T4-fourth time, phi 1 '-first overcurrent protection period, phi 2' -second overcurrent protection period, and phi N '-Nth' overcurrent protection period.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples.
A starting or anti-blocking method of a direct current brush motor is different from the prior art in that the starting or anti-blocking method comprises a traditional overcurrent protection circuit, an overtemperature protection circuit and an H-bridge driving circuit shown in figure 1, and further comprises a PWM control module, wherein the PWM control module P1 controls the first high-side PMOS switch tube M1, the second high-side PMOS switch tube M2, the third low-side NMOS switch tube M3 and the fourth low-side NMOS switch tube M4 to be turned on and off according to modulation time and a modulation current threshold Ipwm respectively. The PWM control module P1 is preset with a modulation current threshold value Ipwm and a modulation current starting time tp, wherein the maximum modulation current threshold value Ipwm is not greater than an overcurrent protection threshold value Iocp, and the minimum modulation current threshold value Ipwm is not less than the rated working current of the DC brush motor. The modulation current starting time is the time from when the load current reaches the modulation current threshold Ipwm to a certain value (such as overcurrent protection starting time Tdeg) set by which the load current may damage the circuit.
As shown in fig. 2, the overcurrent protection start time Tdeg of the conventional overcurrent protection circuit is 4 μ s, and the overcurrent protection interval time Tocp is 2ms, which is a working timing diagram of the conventional overcurrent protection circuit of the conventional H-bridge drive dc brushed motor, where Φ 1 is a first conventional overcurrent protection period, Φ 2 is a second conventional overcurrent protection period, and Φ N is a first conventional overcurrent protection period Φ 1 and an nth conventional overcurrent protection period.
In this embodiment, the PWM control module P1 replaces the conventional overcurrent protection circuit, when the motor is started or locked, if the PWM control module P1 detects that the load current exceeds the overcurrent protection threshold Iocp, as shown in fig. 3, the first time T1, which is equal to Tdeg, is 1-8 us, preferably 2-4 us, from reaching the overcurrent protection threshold Iocp, where the first time is equal to the overcurrent protection starting time when the conventional overcurrent protection circuit operates; this is the first overcurrent detection stage; when the first time is over, the PWM control module P1 turns off the first high-side MOS switch M1 and the second high-side MOS switch M2, turns on the third low-side MOS switch M3 and the fourth low-side MOS switch M4, so that the load current Iload is in a slow attenuation state, and continues for a second time T2 ═ Tpwm, the second time T2 is greater than the first time and less than 100 microseconds, preferably 20us, and Tpwm is a slow attenuation time of the current of the PWM control module P1, which is a first slow attenuation phase of the current;
if the motor rotor operates in the second time T2 process, the H bridge returns to the normal starting state; if the second time T2 is over and the motor rotor is still not running, the H-bridge driving circuit enters a normal starting state, and the normal starting state starts while the PWM control module P1 detects the load current, and when the load current exceeds the modulation current threshold Ipwm and the duration exceeds the modulation current starting time tp, the H-bridge driving circuit starts from the normal starting state to the modulation current starting time tp, which is a second overcurrent detection phase, the PWM control module P1 immediately turns off the first high-side MOS switch tube M1 and the second high-side MOS switch tube M2, turns on the third low-side MOS switch tube M3 and the fourth low-side MOS switch tube M4, so that the load current Iload is in a slow attenuation state, and continues for a second time T2 ═ Tpwm, which is a second current slow attenuation phase, and repeats the second overcurrent detection phase and the second current slow attenuation phase, and the duration of the second overcurrent detection phase is T2' ═ tblk, tblank is the current sensing time of the PWM control module P1, a few microseconds, and possibly T2' ═ T1; cyclically repeating the second overcurrent current detection phase and the second current slow decay phase, or cyclically repeating the first current slow decay phase and the second overcurrent current detection phase until a third time T3 is reached, wherein the third time T3 is 2-9 milliseconds;
the overall process of circularly repeating the first overcurrent current detection phase and the first current slow attenuation phase is a current slow attenuation front half period; a duration of said third time T3 ═ N (Tocp + Tdeg); the third time is equal to a conventional over-current protection period, typically a few milliseconds.
During the current slow decay pre-half cycle, the load current Iload stabilizes at the modulation current threshold Ipwm;
if the motor rotor operates in the third time T3, the H bridge is restored to the normal starting state; if the third time T3 is over, the motor rotor is still not running, the PWM control module P1 turns off the first high-side MOS switch tube M1, the second high-side MOS switch tube M2, the third low-side MOS switch tube M3, and the fourth low-side MOS switch tube M4, and continues for a fourth time T4 — T3, at this time, the H bridge is in a high-impedance state, which is a second half period of current decay;
if the motor rotor operates in the process of the fourth time T4, the H bridge is recovered to a normal starting state; if the fourth time is over and the motor rotor is not operated, cyclically repeating the current slow decay first half period and the current fast decay second half period until a fifth time T5 is N (T3+ T4); the fifth time T5 is the operating time of the PWM control module, which is typically several seconds. Φ 1 ' in fig. 3 is the first conventional overcurrent protection period corresponding to Φ 1 in fig. 2, Φ 2 ' is the first conventional overcurrent protection period corresponding to Φ 2 in fig. 2, and Φ N ' is the first conventional overcurrent protection period corresponding to Φ N in fig. 2.
If the motor rotor operates in the fifth time T5 process, the H bridge returns to the normal starting state; if the fifth time T5 is over and the motor rotor is still not running, the PWM control module P1 automatically turns off.
Preferably, the starting or anti-blocking method of the dc brushed motor further includes a conventional overcurrent protection circuit, and if the PWM control module P1 is automatically turned off, the conventional overcurrent protection circuit operates.
Preferably, the starting or anti-blocking method of the dc brushed motor further includes an over-temperature protection circuit, and if the temperature of the H-bridge driving circuit exceeds a temperature protection threshold, the over-temperature protection circuit immediately controls the switch tube control unit to enable the first high-side MOS switch tube M1, the second high-side MOS switch tube M2, the third low-side MOS switch tube M3, and the fourth low-side MOS switch tube M4 to enter a high-resistance protection state, and a conventional over-current protection period is cyclically repeated.
It should be noted that the above-described embodiments may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.

Claims (8)

1. A starting or anti-blocking method of a direct current brush motor is characterized by further comprising a PWM control module, wherein the PWM control module is used for setting a modulation current threshold and a modulation current starting time, the modulation current threshold is not more than an overcurrent protection threshold at the maximum and not less than the rated working current of the direct current brush motor at the minimum; when the motor is started or locked, namely the PWM control module detects that the load current exceeds an overcurrent protection threshold value, the first time is continued from reaching the overcurrent protection threshold value, and the first overcurrent current detection stage is realized; when the first time is over, the PWM control module closes the first high-side MOS switch tube and the second high-side MOS switch tube, and opens the third low-side MOS switch tube and the fourth low-side MOS switch tube, so that the load current is in a slow attenuation state and lasts for a second time, which is a first current slow attenuation stage; if the motor rotor operates in the second time process, the H bridge is recovered to a normal starting state; if the second time is over and the motor rotor is still not running, the H-bridge driving circuit enters a normal starting state, the PWM control module detects the load current when the normal starting state starts, and when the load current exceeds the modulation current threshold and the duration exceeds the modulation current starting time, the normal starting state is started and the modulation current starting time is over, which is a second overcurrent detection stage; when the second overcurrent current detection stage is finished, the PWM control module immediately closes the first high-side MOS switch tube and the second high-side MOS switch tube, and opens the third low-side MOS switch tube and the fourth low-side MOS switch tube to enable the load current to be in a slow attenuation state and to continue for a second time, which is a second current slow attenuation stage; cyclically repeating the second overcurrent detection phase and the second current slow decay phase until a third time is reached; the first overcurrent current detection phase, the first current slow attenuation phase and the overall process of circularly repeating the first overcurrent current detection phase and the first current slow attenuation phase are half periods before current slow attenuation; the duration is the third time; during the current slow decay pre-half cycle, the load current settles at the modulation current threshold; if the motor rotor operates in the third time process, the H bridge is recovered to a normal starting state; if the third time is over, the motor rotor still does not operate, the PWM control module closes the first high-side MOS switch tube, the second high-side MOS switch tube, the third low-side MOS switch tube and the fourth low-side MOS switch tube and continues for a fourth time, and the H bridge is in a high-resistance state which is a later half cycle of fast current attenuation; if the motor rotor operates in the fourth time process, the H bridge is recovered to a normal starting state; if the fourth time is over and the motor rotor still does not operate, circularly repeating the current slow attenuation front half period and the current fast attenuation rear half period until reaching the fifth time; if the motor rotor operates in the fifth time process, the H bridge is recovered to a normal starting state; and if the fifth time is over and the motor rotor does not operate yet, the PWM control module is automatically closed.
2. The method for starting or anti-stalling a DC brush motor according to claim 1, wherein the first time is 2-8 microseconds.
3. The method of claim 1, wherein the second time is greater than the first time and less than 100 microseconds.
4. The method according to claim 1, wherein the third time is equal to a conventional overcurrent protection period of 2-9 ms.
5. The method of claim 1, wherein the fourth time is equal to the third time, and the first half period of the slow current decay and the second half period of the fast current decay together form a current decay period.
6. The method according to claim 1, wherein the fifth time is an operating time of the PWM control module, and the operating time of the PWM control module is not greater than 10 seconds.
7. The method according to claim 1, further comprising a conventional overcurrent protection circuit, wherein the conventional overcurrent protection circuit operates if the PWM control module is automatically turned off.
8. The method for starting or resisting rotation blockage of the direct current brush motor according to claim 1 or 7, further comprising an over-temperature protection circuit, wherein if the temperature of the H-bridge driving circuit exceeds a temperature protection threshold, the over-temperature protection circuit immediately controls the switch tube control unit to enable the first high-side MOS switch tube, the second high-side MOS switch tube, the third low-side MOS switch tube and the fourth low-side MOS switch tube to enter a high-resistance protection state, and a traditional over-current protection period is repeated in a circulating mode.
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CN109687383A (en) * 2018-12-20 2019-04-26 北京经纬恒润科技有限公司 The stall detection method and device of brush direct current motor

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