CN216390833U - Emergency motor drive circuit - Google Patents
Emergency motor drive circuit Download PDFInfo
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- CN216390833U CN216390833U CN202123080691.5U CN202123080691U CN216390833U CN 216390833 U CN216390833 U CN 216390833U CN 202123080691 U CN202123080691 U CN 202123080691U CN 216390833 U CN216390833 U CN 216390833U
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Abstract
The application discloses emergency motor drive circuit, this emergency motor drive circuit include that emergency motor drive circuit includes MCU control circuit, first MOS drive circuit, direct current that establish ties in proper order and has brush motor and second MOS drive circuit, and emergency motor drive circuit still includes: an auxiliary control circuit; the first input end of the auxiliary control circuit is connected to a high level VDD, the second input end of the auxiliary control circuit is connected between the MCU control circuit and the first MOS drive circuit, the output end of the auxiliary control circuit is connected between the first MOS drive circuit and the direct current brush motor, wherein the high level VDD is connected between the direct current brush motor and the second MOS drive circuit, and the first MOS drive circuit and the direct current brush motor are grounded after the auxiliary control circuit is switched on. Through the technical scheme in the application, the emergency driving under the condition that the main driving circuit fails is realized, the breakdown of an MOS tube in the MOS driving circuit can be avoided, and the equipment failure rate is reduced.
Description
Technical Field
The application relates to the technical field of motor driving, in particular to an emergency motor driving circuit.
Background
With the continuous development of motor technology, for a dc brush motor, a driving circuit thereof is usually implemented based on an MCU control circuit and an MOS driving circuit, and the structure is shown in fig. 1, the MCU control circuit controls a high end of an MOS transistor in the MOS driving circuit to be turned on to a power supply and a low end of the MOS transistor to be turned on to ground, so as to control the dc brush motor to rotate, wherein a current flow direction is shown as an arrow direction in fig. 1.
When the MCU control circuit fails or any link fails, the direct current brush motor cannot normally rotate, and even if the direct current brush motor is required to rotate in an emergency, the restraint is still insufficient.
In addition, in the process, the reverse electromotive force generated when the MOS tube is turned off cannot be released, so that the MOS tube is easy to break down, and the MOS drive circuit is damaged.
SUMMERY OF THE UTILITY MODEL
The purpose of this application lies in: at least one problem that current emergency motor drive circuit exists is solved.
The technical scheme of the application is as follows: the utility model provides an emergency motor drive circuit, this emergency motor drive circuit is including MCU control circuit, first MOS drive circuit, direct current that establish ties in proper order have brush motor and second MOS drive circuit, and emergency motor drive circuit still includes: an auxiliary control circuit;
the first input end of the auxiliary control circuit is connected with a high level VDD, the second input end of the auxiliary control circuit is connected between the MCU control circuit and the first MOS drive circuit, the output end of the auxiliary control circuit is connected between the first MOS drive circuit and the DC brush motor,
wherein, a high level VDD is connected between the direct current brush motor and the second MOS drive circuit,
after the auxiliary control circuit is conducted, the first MOS drive circuit is grounded with the direct-current brush motor.
In any one of the above technical solutions, further, the auxiliary control circuit includes: an AND gate logic circuit and a third MOS drive circuit; the first input end of the AND gate logic circuit is connected to the high level VDD, the second input end of the AND gate logic circuit is connected between the MCU control circuit and the first MOS drive circuit, and the output end of the AND gate logic circuit is connected to the first port of the third MOS drive circuit; the second port of the third MOS drive circuit is connected between the first MOS drive circuit and the DC brush motor, and the third port of the third MOS drive circuit is grounded.
In any one of the above technical solutions, further, the auxiliary control circuit includes: an NMOS transistor Q27, a diode D3, and a transistor Q28; the anode of the diode D3 is connected to the high level VDD, and the cathode of the diode D3 is connected to the gate of the NMOS transistor Q27 through the resistor R58; the drain electrode of the NMOS transistor Q27 is connected between the first MOS drive circuit and the DC brush motor, and the source electrode of the NMOS transistor Q27 is grounded through a capacitor C54; the base of the triode Q28 is connected to the MCU control circuit through a resistor R59, the collector of the triode Q28 is connected between the resistor R58 and the gate of the NMOS transistor Q27, and the emitter of the triode Q28 is grounded.
In any of the above technical solutions, a transistor Q25 is disposed in the first MOS driving circuit, and a transistor Q29 and a transistor Q31 are disposed in the second MOS driving circuit, where the transistor Q25 and the transistor Q31 are NPN transistors, the transistor Q29 is a PNP transistor, and a base of the transistor Q29 is connected to a collector of the transistor Q31.
In any one of the above technical solutions, further, the auxiliary control circuit further includes: a transistor Q26, a transistor Q32, and a diode D7; the collector of the triode Q26 is connected with the base of the triode Q25, and the emitter of the triode Q26 is grounded; the collector of the triode Q32 is connected with the base of the triode Q31, and the emitter of the triode Q32 is grounded; the anode of the diode D7 is connected to the high level VDD, the cathode of the diode D7 is connected to the base of the transistor Q26 through the resistor R51, and the cathode of the diode D7 is also connected to the base of the transistor Q32 through the resistor R52.
In any one of the above technical solutions, further, the first MOS driving circuit further includes: a PMOS transistor Q23; the gate of the PMOS transistor Q23 is connected to the collector of the transistor Q25 through a resistor R56, the source of the PMOS transistor Q23 is connected to the battery voltage VBAT, and the drain of the PMOS transistor Q23 is connected to one end of the dc brushed motor.
In any one of the above technical solutions, further, the second MOS driving circuit further includes: an NMOS transistor Q30; the gate of the NMOS transistor Q30 is connected to the collector of the transistor Q29 through a resistor R60, the source of the NMOS transistor Q30 is grounded through a resistor RP3, and the drain of the NMOS transistor Q30 is connected to the other end of the dc brush motor.
The beneficial effect of this application is:
technical scheme in this application, on current drive circuit's basis, sets up auxiliary control circuit to realize that the direct current has the brush motor emergency drive under the condition that main drive circuit became invalid, can avoid MOS pipe to be punctured among the MOS drive circuit, help reducing the loss of equipment trouble probability of occurrence and property.
Drawings
The advantages of the above and/or additional aspects of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic block diagram of a prior art DC brushed motor drive circuit;
FIG. 2 is a schematic block diagram of an emergency motor drive circuit according to one embodiment of the present application;
fig. 3 is a circuit diagram illustration of an emergency motor drive circuit according to an embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
The embodiment provides an emergency motor driving circuit, which comprises an MCU control circuit, a first MOS driving circuit, a dc brushed motor and a second MOS driving circuit connected in series in sequence, wherein the first MOS driving circuit and the second MOS driving circuit can be implemented by conventional dc brushed motor driving circuits.
In this embodiment, the emergency motor driving circuit further includes: an auxiliary control circuit; the first input end of the auxiliary control circuit is connected to a high level VDD, the second input end of the auxiliary control circuit is connected between the MCU control circuit and the first MOS drive circuit, the output end of the auxiliary control circuit is connected between the first MOS drive circuit and the direct current brush motor, wherein the high level VDD is connected between the direct current brush motor and the second MOS drive circuit, and the first MOS drive circuit and the direct current brush motor are grounded after the auxiliary control circuit is switched on.
Specifically, on the basis of the existing dc brush motor driving circuit, a set of simple control circuit is added as an auxiliary control circuit for emergency use, and a logic circuit with a protection main control loop (MCU control circuit) is provided in the auxiliary circuit, so that the MCU control circuit and the auxiliary control circuit are constrained with each other, thereby avoiding control logic conflict between the two circuits and damaging devices such as the MOS driving circuit and the dc brush motor.
The emergency motor driving circuit in the embodiment is mainly applied to emergency direct current brush motor driving on a gear shifting computer module of an automobile, when a main driving circuit (MCU control circuit) of the direct current brush motor inside the gear shifting computer fails, or when communication of an automobile host to the gear shifting computer module is abnormal, the automobile needs to be hung in a P gear, at the moment, the automobile host can directly provide an external power source (high level VDD), so that the direct current brush motor is rotated emergently, the P gear is hung in, and flameout and parking operation is achieved.
Further, as shown in fig. 2, the auxiliary control circuit includes: an AND gate logic circuit and a third MOS drive circuit; the first input end of the AND gate logic circuit is connected to the high level VDD, the second input end of the AND gate logic circuit is connected between the MCU control circuit and the first MOS drive circuit, and the output end of the AND gate logic circuit is connected to the first port of the third MOS drive circuit; the second port of the third MOS drive circuit is connected between the first MOS drive circuit and the DC brush motor, and the third port of the third MOS drive circuit is grounded.
Specifically, an and gate logic circuit and a third MOS drive circuit are arranged in the auxiliary control circuit, the third MOS drive circuit is used as a high-end MOS grounding circuit of the direct-current brush motor, a high-level VDD is directly applied to the low end of the direct-current brush motor, and a MOS transistor in the third MOS drive circuit is controlled to be conducted through the high-level VDD, so that current reversely flows through the direct-current brush motor.
In addition, when the first and second MOS drive circuits are switched off, the generated reverse electromotive force is reversely discharged through a parasitic two-transistor of the MOS transistor in the third MOS drive circuit, and the reverse electromotive force generated by the switching-off of the third MOS drive circuit is reversely discharged through a parasitic diode of the MOS transistor in the first and second MOS drive circuits.
It should be noted that the high level VDD is from the outside, and when the MCU control circuit or the first and second MOS driving circuits fail or are disconnected from the outside, the high level VDD functions to realize emergency control of the dc brush motor.
Further, as shown in fig. 3, on the basis of the above embodiment, the first MOS drive circuit further includes: a PMOS transistor Q23; the gate of the PMOS transistor Q23 is connected to the collector of the transistor Q25 through a resistor R56, the source of the PMOS transistor Q23 is connected to the battery voltage VBAT, and the drain of the PMOS transistor Q23 is connected to one end of the dc brushed motor.
On the basis of the above embodiment, the second MOS drive circuit further includes: an NMOS transistor Q30; the gate of the NMOS transistor Q30 is connected to the collector of the transistor Q29 through a resistor R60, the source of the NMOS transistor Q30 is grounded through a resistor RP3, and the drain of the NMOS transistor Q30 is connected to the other end of the dc brush motor.
Specifically, the MOTOP end of the output port of the MCU control circuit is connected to the base electrode of a triode Q24 through a resistor R55, the triode Q24 is a PNP type triode, the emitter electrode of the triode Q24 is connected with +5V voltage, and the collector electrode of the triode Q24 is used as a Mutex end and is connected with the first MOS drive circuit and the second MOS drive circuit.
In this embodiment, the auxiliary control circuit includes: an NMOS transistor Q27, a diode D3, and a transistor Q28; the anode of the diode D3 is connected to the high level VDD, and the cathode of the diode D3 is connected to the gate of the NMOS transistor Q27 through the resistor R58; the drain electrode of the NMOS transistor Q27 is connected between the first MOS drive circuit and the DC brush motor, and the source electrode of the NMOS transistor Q27 is grounded through a capacitor C54; the base of the triode Q28 is connected to the MCU control circuit through a resistor R59, the collector of the triode Q28 is connected between the resistor R58 and the gate of the NMOS transistor Q27, and the emitter of the triode Q28 is grounded.
On the basis of the above embodiment, the transistor Q25 is disposed in the first MOS driving circuit, and the transistor Q29 and the transistor Q31 are disposed in the second MOS driving circuit, wherein the transistor Q25 and the transistor Q31 are NPN transistors, the transistor Q29 is a PNP transistor, and the base of the transistor Q29 is connected to the collector of the transistor Q31.
On the basis of the above embodiment, the auxiliary control circuit further includes: a transistor Q26, a transistor Q32, and a diode D7; the collector of the triode Q26 is connected with the base of the triode Q25, and the emitter of the triode Q26 is grounded; the collector of the triode Q32 is connected with the base of the triode Q31, and the emitter of the triode Q32 is grounded; the anode of the diode D7 is connected to the high level VDD, the cathode of the diode D7 is connected to the base of the transistor Q26 through the resistor R51, and the cathode of the diode D7 is also connected to the base of the transistor Q32 through the resistor R52.
Under normal operating condition, MCU control circuit output low level is signal reversal and amplification behind triode Q24, make triode Q24's Mutex end (collecting electrode) become the high level, the high level drive triode Q25 of Mutex end, Q31, Q28 switches on, its collecting electrode draws low PMOS transistor Q23 to switch on after triode Q25 switches on, make direct current have brush motor M high-end to switch on, triode Q31 switches on and makes triode Q29 and NMOS transistor Q30 switch on, direct current has brush motor M's low end to switch on, direct current has brush motor operation. At this time, as the triode Q28 is turned on, the gate of the NMOS transistor Q27 is close to 0V, the NMOS transistor Q27 is always in a cut-off state, and the control of the dc brush motor is realized by the MCU control circuit, thereby avoiding the phenomenon of MOS transistor damage caused by the simultaneous turn-on of the PMOS transistor Q23 and the NMOS transistor Q27.
When the MCU control circuit fails to control, the MOTOP end of the port is in a high level, the triode Q24 is in a cut-off state, and the Mutex end is in a low level, so that the triode Q25, the triode Q31, the triode Q29, the PMOS transistor Q23 and the NMOS transistor Q30 are completely in a cut-off state, at the moment, the triode Q28 is also in a cut-off state, the high level VDD is converted into an effective state, the NMOS transistor Q27 is controlled by the externally input high level VDD, when the externally input high level VDD is a 12V power supply, the triodes Q26 and Q32 are conducted to the ground, the PMOS transistor Q23 and the NMOS transistor Q30 are ensured to be always in a cut-off state, and the control right of the direct current brush motor is returned to the external VDD.
In addition, when the PMOS transistor Q23 and the NMOS transistor Q30 are turned on and then turned off, the NMOS transistor Q27 may be turned on by the back electromotive force generated by the dc brush motor M, so that the energy is discharged to the ground; when the external control NMOS transistor Q27 is turned on and then turned off, the back electromotive force generated by the dc brush motor M can be discharged to the battery voltage VBAT through the parasitic diodes of the PMOS transistor Q23 and the NMOS transistor Q30, thereby preventing the device from being damaged by the back voltage.
The technical scheme of this application has been explained in detail in the above with the accompanying drawings, and this application has proposed an emergency motor drive circuit, and this emergency motor drive circuit includes that emergency motor drive circuit includes MCU control circuit, first MOS drive circuit, direct current that establish ties in proper order have brush motor and second MOS drive circuit, and emergency motor drive circuit still includes: an auxiliary control circuit; the first input end of the auxiliary control circuit is connected to a high level VDD, the second input end of the auxiliary control circuit is connected between the MCU control circuit and the first MOS drive circuit, the output end of the auxiliary control circuit is connected between the first MOS drive circuit and the direct current brush motor, wherein the high level VDD is connected between the direct current brush motor and the second MOS drive circuit, and the first MOS drive circuit and the direct current brush motor are grounded after the auxiliary control circuit is switched on. Through the technical scheme in the application, the emergency driving under the condition that the main driving circuit fails is realized, the breakdown of an MOS tube in the MOS driving circuit can be avoided, and the equipment failure rate is reduced.
In the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The shapes of the various elements in the drawings are illustrative and do not preclude the existence of certain differences from the actual shapes, and the drawings are used for the purpose of illustrating the principles of the present application and are not intended to limit the present application.
Although the present application has been disclosed in detail with reference to the accompanying drawings, it is to be understood that such description is merely illustrative and not restrictive of the application of the present application. The scope of the present application is defined by the appended claims and may include various modifications, adaptations, and equivalents of the subject application without departing from the scope and spirit of the present application.
Claims (7)
1. The utility model provides an emergency motor drive circuit, emergency motor drive circuit is including MCU control circuit, first MOS drive circuit, direct current that establish ties in proper order have brush motor and second MOS drive circuit, its characterized in that, emergency motor drive circuit still includes: an auxiliary control circuit;
the first input end of the auxiliary control circuit is connected with a high level VDD, the second input end of the auxiliary control circuit is connected between the MCU control circuit and the first MOS drive circuit, the output end of the auxiliary control circuit is connected between the first MOS drive circuit and the DC brush motor,
wherein a high level VDD is connected between the direct current brush motor and the second MOS drive circuit,
after the auxiliary control circuit is conducted, the first MOS drive circuit and the direct current brush motor are grounded.
2. An emergency motor drive circuit as claimed in claim 1, wherein said auxiliary control circuit comprises: an AND gate logic circuit and a third MOS drive circuit;
a first input end of the AND gate logic circuit is connected to the high level VDD, a second input end of the AND gate logic circuit is connected between the MCU control circuit and the first MOS drive circuit, and an output end of the AND gate logic circuit is connected to a first port of the third MOS drive circuit;
and the second port of the third MOS drive circuit is connected between the first MOS drive circuit and the direct-current brush motor, and the third port of the third MOS drive circuit is grounded.
3. An emergency motor drive circuit as claimed in claim 1, wherein said auxiliary control circuit comprises: an NMOS transistor Q27, a diode D3, and a transistor Q28;
the anode of the diode D3 is connected to the high level VDD, and the cathode of the diode D3 is connected to the gate of the NMOS transistor Q27 through a resistor R58;
the drain of the NMOS transistor Q27 is connected between the first MOS driving circuit and the dc brushed motor, and the source of the NMOS transistor Q27 is grounded through a capacitor C54;
the base electrode of the triode Q28 is connected with the MCU control circuit through a resistor R59, the collector electrode of the triode Q28 is connected between the resistor R58 and the grid electrode of the NMOS transistor Q27, and the emitter electrode of the triode Q28 is grounded.
4. The emergency motor driving circuit as claimed in claim 1, wherein a transistor Q25 is disposed in the first MOS driving circuit, and a transistor Q29 and a transistor Q31 are disposed in the second MOS driving circuit, wherein the transistor Q25 and the transistor Q31 are NPN transistors, the transistor Q29 is a PNP transistor, and a base of the transistor Q29 is connected to a collector of the transistor Q31.
5. An emergency motor drive circuit as claimed in claim 4, wherein said auxiliary control circuit further comprises: a transistor Q26, a transistor Q32, and a diode D7;
the collector of the triode Q26 is connected to the base of the triode Q25, and the emitter of the triode Q26 is grounded;
the collector of the triode Q32 is connected to the base of the triode Q31, and the emitter of the triode Q32 is grounded;
the anode of the diode D7 is connected to the high level VDD, the cathode of the diode D7 is connected to the base of the transistor Q26 through the resistor R51, and the cathode of the diode D7 is also connected to the base of the transistor Q32 through the resistor R52.
6. The emergency motor driving circuit according to claim 4, wherein the first MOS driving circuit further comprises: a PMOS transistor Q23;
the gate of the PMOS transistor Q23 is connected to the collector of the transistor Q25 through a resistor R56, the source of the PMOS transistor Q23 is connected to the battery voltage VBAT, and the drain of the PMOS transistor Q23 is connected to one end of the dc brush motor.
7. The emergency motor driving circuit according to claim 6, wherein the second MOS driving circuit further comprises: an NMOS transistor Q30;
the gate of the NMOS transistor Q30 is connected to the collector of the transistor Q29 through a resistor R60, the source of the NMOS transistor Q30 is grounded through a resistor RP3, and the drain of the NMOS transistor Q30 is connected to the other end of the dc brush motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123080691.5U CN216390833U (en) | 2021-12-09 | 2021-12-09 | Emergency motor drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123080691.5U CN216390833U (en) | 2021-12-09 | 2021-12-09 | Emergency motor drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN216390833U true CN216390833U (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123080691.5U Active CN216390833U (en) | 2021-12-09 | 2021-12-09 | Emergency motor drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115116206A (en) * | 2022-07-27 | 2022-09-27 | 广达创芯电子技术(杭州)有限公司 | Load protection alarm circuit of double MOS (metal oxide semiconductor) tubes |
-
2021
- 2021-12-09 CN CN202123080691.5U patent/CN216390833U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115116206A (en) * | 2022-07-27 | 2022-09-27 | 广达创芯电子技术(杭州)有限公司 | Load protection alarm circuit of double MOS (metal oxide semiconductor) tubes |
| CN115116206B (en) * | 2022-07-27 | 2024-01-23 | 广达创芯电子技术(杭州)有限公司 | Load protection alarm circuit of double MOS tube |
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