CN114792966A - Overcurrent protection circuit for motor drive circuit, motor drive circuit and electric equipment - Google Patents
Overcurrent protection circuit for motor drive circuit, motor drive circuit and electric equipment Download PDFInfo
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- CN114792966A CN114792966A CN202110098448.1A CN202110098448A CN114792966A CN 114792966 A CN114792966 A CN 114792966A CN 202110098448 A CN202110098448 A CN 202110098448A CN 114792966 A CN114792966 A CN 114792966A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Abstract
The application relates to the technical field of protection circuits and discloses an overcurrent protection circuit for a motor drive circuit, which comprises a comparator, a triode and a first power supply source. The positive input end of the comparator is used as the first input end of the overcurrent protection circuit and is connected with the first output end of the motor driving module; the negative input end of the comparator is used as the second input end of the overcurrent protection circuit and is connected with the first output end of the motor driving module; the output end of the comparator is connected with the base stage of the triode, and the output end of the comparator is also used as the first output end of the overcurrent protection circuit and is connected with the first input end of the motor driving chip; the collector of the triode is used as a second output end of the overcurrent protection circuit and is connected with a first input end of the motor driving module; the emitter of the triode is connected with the first power supply. Therefore, the anti-interference function of the motor driving circuit is realized, and the reliability and the accuracy of the motor driving circuit are improved. The application also discloses a motor drive circuit and electric equipment.
Description
Technical Field
The present application relates to the technical field of protection circuits, and for example, to an overcurrent protection circuit for a motor drive circuit, and a power consumption device.
Background
At present, overcurrent protection can be realized through a driving circuit for motor loads such as a compressor and a fan in household electrical appliances such as an air conditioner, and in the driving circuit, a motor driving Module such as an IPM Module has important significance for normal operation of the whole driving circuit and the motor loads such as the compressor and the motor. When the motor loads such as the compressor and the motor are subjected to overcurrent, if the driving signal of the motor driving chip cannot be locked in the preset safety time, the inside of the motor driving module can continuously generate short-circuit current, so that the wafer of the motor driving module is damaged by overheating, and even rotor coils in the motor loads such as the compressor and the fan are burnt out, and the operation of the whole machine is influenced.
In the existing scheme of the motor overcurrent protection circuit, a sampling resistor is connected to the output end of a lower bridge arm of a motor drive module, and when a motor load is in overcurrent, a short-circuit current flows to the sampling resistor through the lower bridge arm of the motor drive module, so that voltages at two ends of the sampling resistor are increased, and an overcurrent protection circuit in the motor drive module is triggered to lock a motor drive signal. However, the resistance value of the sampling resistor is only about 3 milliohm to 20 milliohm generally, when larger interference voltage exists at two ends of the sampling resistor, the interference voltage can be directly transmitted to the overcurrent detection port of the motor driving module through the sampling resistor, and even if a motor load works normally, the protection action of the motor driving module can be triggered to cause the complete machine to be mistakenly protected and shut down, so that the anti-interference performance of the existing protection circuit scheme is poor. In addition, due to manufacturing process and internal circuit precision errors, the protection trigger voltage value of the overcurrent detection port in the motor driving module is 0.45-0.55 v, so that the difference between corresponding protection current values is large, and the protection precision is influenced.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
if larger interference voltage exists at two ends of the sampling resistor, the protection action of the motor driving module is easily triggered, the whole machine is mistakenly protected and stops working, and therefore the anti-interference performance is poor.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended to be a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides an overcurrent protection circuit for a motor drive circuit, the motor drive circuit and electric equipment, so as to improve the anti-interference performance of the motor drive circuit.
In some embodiments, the over-current protection circuit for a motor driving circuit includes a comparator, a transistor, and a first power supply. The positive input end of the comparator is used as the first input end of the overcurrent protection circuit and is connected with the first output end of the motor driving module; the negative input end of the comparator is used as the second input end of the overcurrent protection circuit and is connected with the first output end of the motor driving module; the output end of the comparator is connected with the base stage of the triode, and the output end of the comparator is also used as the first output end of the overcurrent protection circuit and is connected with the first input end of the motor driving chip; the collector of the triode is used as a second output end of the overcurrent protection circuit and is connected with a first input end of the motor driving module; the emitter of the triode is connected with a first power supply.
In some embodiments, the overcurrent protection circuit for a motor drive circuit further comprises a first resistor. The first resistor is connected between the collector of the triode and the ground in series.
In some embodiments, the overcurrent protection circuit for a motor drive circuit further comprises a filtering module. The filter module is connected in series between the output end of the comparator and the first input end of the motor driving chip.
In some embodiments, the filter circuit includes a second resistor and a capacitor. The first end of the second resistor is connected with the output end of the comparator, and the second end of the second resistor is connected with the first input end of the motor driving chip; the capacitor is connected between the second end of the second resistor and the ground in series.
In some embodiments, the overcurrent protection circuit for the motor drive circuit further comprises a second power supply, a fourth resistor and a fifth resistor. The fourth resistor is connected between the positive input end of the comparator and the first output end of the motor driving module in series; the fifth resistor is connected in series between the positive input end of the comparator and the second power supply.
In some embodiments, the fourth and fifth resistors are variable resistors.
In some embodiments, the motor driving circuit includes a motor driving chip, a motor driving module, and the overcurrent protection circuit for the motor driving circuit. A first input end of the motor driving chip is connected with a first output end of the overcurrent protection circuit; the second input end of the motor driving chip is connected with the second output end of the motor driving module; the output end of the motor driving chip is connected with the second input end of the motor driving module; a first input end of the motor driving module is connected with a second output end of the overcurrent protection circuit; a first output end of the motor driving module is respectively connected with a first input end and a second input end of the overcurrent protection circuit; and a third output end of the motor driving module is connected with a motor.
In some embodiments, the powered device includes the motor drive circuit and the motor described above.
In some embodiments, the powered device is an air conditioner.
The overcurrent protection circuit for the motor drive circuit, the motor drive circuit and the electric equipment provided by the embodiment of the disclosure can realize the following technical effects:
through setting up the overcurrent protection circuit, when the motor takes place to overflow, can directly export overcurrent signal to motor drive chip through the comparator, can control the on-off state of triode simultaneously so that voltage reaches the protection trigger voltage value of motor drive module's first input, the inside protection logic of trigger motor drive module to can make motor drive module's output overcurrent signal to drive chip, guarantee motor drive chip locking drive signal's output and realize overcurrent protection function. When the motor normally works, the on-off state of the triode is controlled through the output of the comparator, so that the interference signal is prevented from being transmitted to the motor driving module and the motor driving chip respectively, the motor driving module is prevented from outputting the interference signal to the motor driving chip, the error protection of the motor driving chip caused by the output of the interference signal locking driving signal is caused, the overcurrent protection function can be realized, the anti-interference function of the motor driving circuit is realized, and the reliability and the accuracy of the motor driving circuit are improved. In addition, because the emitter of the triode is connected with the first power supply, when the motor is subjected to overcurrent, the voltage can reach the voltage of the first power supply; because the voltage of the first power supply is always greater than the protection trigger voltage of the first input end of the motor driving module, the protection logic inside the motor driving module is always triggered, so that the control protection precision of the motor driving module is improved, and the reliability and the accuracy of the motor driving circuit are further improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a circuit diagram of a conventional motor overcurrent protection circuit provided by an embodiment of the present disclosure;
fig. 2 is a circuit diagram of an overcurrent protection circuit for a motor driving circuit according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of an overcurrent protection circuit for a motor driving circuit according to an embodiment of the disclosure;
fig. 4 is a circuit diagram for a motor driving circuit according to an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and claims of the embodiments of the disclosure and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure may be understood as specific cases by those of ordinary skill in the art.
In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the disclosed embodiments can be understood by those of ordinary skill in the art according to specific situations.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. E.g., a and/or B, represents: a or B, or A and B.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.
Fig. 1 is a circuit diagram of an existing overcurrent protection circuit for a motor according to an embodiment of the present disclosure. Referring to fig. 1, in the conventional overcurrent protection circuit for a motor, a sampling resistor Rs is connected in series between a first output end M1 of a motor driving module 11 and the ground; the resistor R is connected in series between the first output terminal M1 and the first input terminal Csc of the motor drive module 11. And a capacitor C is connected in series with two ends of the resistor R. Thus, when the motor 13 works normally, the interference signals generated by the motor driving module 11 can be directly output to the sampling resistor Rs from the first output end M1, and because the sampling resistor Rs and the first input end Csc of the motor driving module 11 are directly connected through the resistor R and the capacitor C, the interference signals can be directly transmitted to the first input end Csc of the motor driving module 11. Once the voltage of these interference signals exceeds the protection trigger voltage value of the first input end Csc of the motor drive module 11, the protection logic of the internal protection circuit of the motor drive module 11 is triggered, and the motor drive module 11 also transmits the interference signals to the second input end Fi of the motor drive chip 12 through the second output end Fo, so as to trigger the protection function of the motor drive chip 12, which causes the complete machine to be under fault protection and shut down, and therefore, the overcurrent protection circuit for the motor has poor interference resistance.
Fig. 2 is a circuit diagram of an overcurrent protection circuit for a motor drive circuit according to an embodiment of the present disclosure. As shown in fig. 2, an embodiment of the present disclosure provides an overcurrent protection circuit for a motor drive circuit to improve the above problem. The overcurrent protection circuit 20 for the motor drive circuit comprises a comparator 21, a triode 22 and a first power supply 23. A positive input end Q1 of the comparator 21 is used as a first input end of the overcurrent protection circuit and is connected with a first output end M1 of the motor driving module 11; a negative input end Q2 of the comparator 21 is used as a second input end of the overcurrent protection circuit 20, and is connected to a first output end M1 of the motor drive module 11; the output end Q3 of the comparator 21 is connected to the base stage B of the triode 22, and the output end Q3 of the comparator 21 is also used as the first output end of the overcurrent protection circuit 20 and connected to the first input end D1 of the motor driving chip 12; a collector C of the triode 22 is used as a second output end of the overcurrent protection circuit 20 and is connected with a first input end Csc of the motor driving module 11; the emitter E of transistor 22 is connected to a first power supply 23.
The motor driving chip 12 is used for driving an inductive load such as a motor and a relay.
The motor driving module 11 may trigger its internal protection circuit according to the overcurrent signal, so as to output or lock the driving signal generated by its internal driving unit. Meanwhile, the motor driving module 11 may control the level output by the second output terminal Fo thereof to change from a high level to a low level according to the overcurrent signal, so as to realize output or locking of the driving signal generated by the motor driving chip 12. The motor driving module 11 is arranged between the motor driving chip 12 and the motor 13, so that the system reliability can be improved, and the conversion efficiency can be improved. In the embodiment of the present disclosure, the motor driving module 12 is configured to control output or locking of driving signals generated by its internal driving unit and the motor driving chip 12 according to an overcurrent signal output by the overcurrent protection circuit 10.
In addition, since the emitter E of the transistor 22 is connected to the first power supply 23, when the motor 13 is over-current, the voltage corresponding to the over-current signal can reach the voltage VCC of the first power supply 23; because VCC is always greater than the protection trigger voltage of the first input end Csc of the motor driving module 11, the protection logic of the protection circuit inside the motor driving module 11 is always triggered, thereby improving the control protection precision of the motor driving module 11 and further improving the reliability and accuracy of the motor driving circuit.
Here, the first power supply 23 may also provide a supply voltage to the comparator 21 of the overcurrent protection circuit 20. In the embodiment of the present disclosure, the first power supply 23 is a dc power supply.
Fig. 4 is a circuit diagram for a motor driving circuit according to an embodiment of the present disclosure. As shown in fig. 4, a first input terminal G1 of the overcurrent protection circuit 20 is connected to a first output terminal M1 of the motor drive module 11, a second input terminal G2 of the overcurrent protection circuit 20 is connected to a first input terminal M1 of the motor drive module 11, a first output terminal G3 of the overcurrent protection circuit 20 is connected to a first input terminal D1 of the motor drive chip 12, and a second output terminal G4 of the overcurrent protection circuit 20 is connected to a first input terminal Csc of the motor drive module 11.
In the embodiment of the present disclosure, when the motor 13 is in an overcurrent state, the overcurrent protection circuit 20 can respond quickly when receiving an overcurrent signal output by the motor driving chip 12, and output the overcurrent signal to the motor driving module 11 to trigger a protection logic of the protection circuit inside the motor driving module 11, and simultaneously output the overcurrent signal to the motor driving chip 12 by the motor driving module 11 to trigger the motor driving chip 12 to lock the output of the driving signal, so as to implement the overcurrent protection function. In addition, the overcurrent protection circuit 20 may also directly output an overcurrent signal to the motor driving chip 12, and trigger the motor driving chip 12 to lock the output of the driving signal, so as to implement an overcurrent protection function. When the motor 13 works normally, the overcurrent protection circuit 20 can avoid directly transmitting the interference signal to the motor driving module 11, and also avoid transmitting the interference signal to the motor driving chip 12 through the motor driving module 11, so that the overcurrent protection function is realized, the anti-interference function of the motor driving circuit is realized, and the reliability and the accuracy of the motor driving circuit are improved.
Fig. 3 is a circuit diagram of an overcurrent protection circuit for a motor drive circuit according to an embodiment of the present disclosure. As shown in fig. 2 and 3, the overcurrent protection circuit 20 further includes a first resistor R1. First resistor R1 is connected in series between collector C of transistor 22 and ground.
Here, the first resistor R1 is provided in the overcurrent protection circuit 20 as a pull-down resistor, and the level input from the first input terminal Csc of the motor drive module 11 can be pulled to a low level by the pull-down resistor R1.
Optionally, the over-current protection circuit 20 further includes a filtering module 24. The filter module 24 is connected in series between the output Q3 of the comparator 21 and the first input D1 of the motor driver chip 12.
Here, the filtering module 24 can filter out an interference signal input into the overcurrent protection circuit 20 by the motor driving module 11, so as to suppress the interference. The filter module 24 is generally composed of a reactive element, for example, a capacitor may be connected in parallel across a resistor to form the filter module, or an inductor may be connected in series across a resistor to form the filter module.
Accordingly, the disclosed embodiments provide a filtering module. The filter module 24 is a resistance-capacitance filter module, and includes a second resistor R2 and a capacitor C1. A first end a2 of the second resistor R2 is connected to the output end Q3 of the comparator 21, and a second end X2 of the second resistor R2 is connected to the first input end D1 of the motor driver chip 12; the capacitor C1 is connected in series between the second terminal X2 of the second resistor R2 and ground. In this way, filtering of the overcurrent signal output by the first output terminal G3 of the overcurrent protection circuit 20 can be achieved, and the resistor-capacitor filtering module 24 is easier to manufacture and convenient to implement.
Optionally, the overcurrent protection circuit 20 further includes a third resistor R3. The third resistor R3 is connected in series between the first power supply 23 and the output Q3 of the comparator 21.
Here, the third resistor R3 is provided in the overcurrent protection circuit 20 as a pull-up resistor, and the level output from the first output terminal G3 of the overcurrent protection circuit 20 can be pulled to a high level by the pull-up resistor R3.
Optionally, the overcurrent protection circuit 20 further includes a second power supply 25, a fourth resistor R4, and a fifth resistor R5. The fourth resistor R4 is connected in series between the positive input terminal Q1 of the comparator 21 and the first output terminal M1 of the motor driving module 11; the fifth resistor R5 is connected in series between the positive input Q1 of the comparator 21 and the second power supply 25. Here, the fourth resistor R4 and the fifth resistor R5 are variable resistors. Through setting up the resistance of fourth resistance R4 and fifth resistance R5, can make motor 13 normally operate, the voltage of first input G1 of overcurrent protection circuit 20 is greater than the voltage of second input G2 all the time to realize the control to the level of overcurrent protection circuit 20's first output G3 output through comparator 21, guarantee the control to the level of motor driver chip 12's first input D1 input, avoid the interference signal in the overcurrent protection circuit 20 to export to motor driver chip 12. Meanwhile, it is possible to ensure control of the level input to the base stage B of the transistor 22, to realize control of the transistor 22, and to prevent an interference signal from being output to the first input terminal Csc of the motor driving module 11 through the transistor 22. Therefore, the anti-interference function of the motor driving circuit is realized, and the reliability and the accuracy of the motor driving circuit are improved.
Thus, the operating principle of the over-current protection circuit 20 is as follows:
when the motor 13 is not started, no current flows from the motor driving module 11, so the voltage at the second input terminal G2 of the overcurrent protection circuit 20 is 0, and the voltage at the first input terminal G1 of the overcurrent protection circuit 20 is VCC R5/(R5+ R6). Since the voltage at the second input terminal G2 of the over-current protection circuit 20 is smaller than the voltage at the first input terminal G1, the first output terminal G3 of the over-current protection circuit 20 outputs a high level to the first input terminal D1 of the motor driver chip 12 under the action of the comparator 21 and the pull-up resistor R3, and therefore, the output of the lock-up driving signal of the motor driver chip 12 is not triggered. In addition, the base stage B of PNP transistor 22 is also inputted with a high level by comparator 21, and transistor 22 is in the off state. At this time, the first input end Csc of the motor driving module 11 is input to 0 under the action of the triode 22 and the pull-down resistor R1, so that the protection logic of the internal protection circuit of the motor driving module 11 is not triggered, and based on this, the motor driving module 11 outputs a high level to the motor driving chip 12 through the second output end Fo, and does not trigger the motor driving chip 12 to lock the output of the driving signal.
When the motor 13 is started and normally operates, the voltage at the second input terminal G2 of the overcurrent protection circuit 20 gradually increases, and the resistance values of the fourth resistor R4 and the fifth resistor R5 are configured, so that the voltage at the first input terminal G1 of the overcurrent protection circuit 20 is always greater than the voltage at the second input terminal G2, and therefore the first output terminal G3 of the overcurrent protection circuit 20 can always output a high level to the first input terminal D1 of the motor driver chip 12 under the action of the comparator 21 and the pull-up resistor R3, and therefore, the output of the locking driving signal of the motor driver chip 12 is not triggered, and the false protection action of the motor driver chip 12 is not caused. Also, the base B of PNP transistor 22 is also input high by comparator 21, and transistor 22 is off. At this time, the input of the first input end Csc of the motor driving module 11 is 0 under the effect of the triode 22 and the pull-down resistor R1, so that the protection logic of the internal protection circuit of the motor driving module 11 is not triggered, based on this, the motor driving module 11 outputs a high level to the motor driving chip 12 through the second output end Fo, and does not trigger the output of the locking driving signal of the motor driving chip 12, so that the anti-interference function of the motor driving circuit can be realized, and the reliability and the accuracy of the motor driving circuit are improved.
When the motor 13 is subjected to overcurrent, the voltage at the second input terminal G2 of the overcurrent protection circuit 20 increases instantaneously, and when the voltage exceeds the voltage at the first input terminal G1 of the overcurrent protection circuit 20, the first output terminal G3 of the overcurrent protection circuit 20 outputs a low level to the first input terminal D1 of the motor driver chip 12 under the action of the comparator 21, so that the motor driver chip 12 is triggered to lock the output of the driving signal, and the overcurrent protection function of the motor driver chip 12 is realized. Also, the base B of PNP transistor 22 is also input low by comparator 21, and transistor 22 is in a conducting state. At this time, the first input end Csc of the motor driving module 11 inputs the voltage VCC under the action of the triode 22 and the first power supply 23, and therefore, the protection logic of the internal protection circuit of the motor driving module 11 may be triggered, based on this, the motor driving module 11 outputs the low level to the motor driving chip 12 through the second output end Fo, and may trigger the motor driving chip 12 to lock the output of the driving signal, so as to implement the overcurrent protection function of the motor driving chip 12 again. In addition, since the voltage input by the first input end Csc of the motor driving module 11 is VCC, no matter what the protection trigger voltage value of the first input end Csc is, the protection logic of the internal protection circuit of the motor driving module 12 is triggered, so that the control protection precision of the motor driving module 12 is improved, and the reliability and accuracy of the motor driving circuit are further improved.
In summary, the overcurrent protection circuit for the motor driving circuit provided by the embodiment of the disclosure can realize the overcurrent protection function and the anti-interference function of the motor driving circuit. In addition, the control protection precision of the motor driving module can be improved, and the reliability and the accuracy of the motor driving circuit are integrally improved.
As shown in fig. 4, an embodiment of the present disclosure provides a motor driving circuit, which includes a motor driving chip 12, a motor driving module 11, and the overcurrent protection circuit 20 for the motor driving circuit. The first input end D1 of the motor driving chip 12 is connected to the first output end G3 of the over-current protection circuit 20; a second input end Fi of the motor driving chip 12 is connected with a second output end Fo of the motor driving module 11; the output end D2 of the motor driving chip 12 is connected to the second input end Cin of the motor driving module 11; a first input end Csc of the motor driving module 11 is connected with a second output end G4 of the overcurrent protection circuit 20; a first output end M1 of the motor drive module 11 is respectively connected to a first input end G1 and a second input end G2 of the overcurrent protection circuit 20; the third output end M2 of the motor driving module 11 is connected to the motor 13.
Here, the output end D2 of the motor driving chip 12 is a six-path signal output end, and correspondingly, the second input end Cin of the motor driving module 11 is a six-path signal input end.
The first output end M1 of the motor driving module 11 is an IGBT module output end formed by packaging three IGBTs (Insulated Gate Bipolar transistors).
Since the motor 13 is a three-phase motor, the input end M3 of the motor 13 is a three-phase input end, and correspondingly, the third output end M2 of the motor driving module 12 is a three-phase output end.
To sum up, the motor driving circuit provided by the embodiment of the disclosure is adopted, through setting the overcurrent protection circuit, the output of the locking driving signal of the motor driving chip can be directly controlled, or the protection logic of the internal protection circuit of the motor driving module can be directly controlled, and the output of the locking driving signal of the motor driving chip can be controlled by controlling the level output by the first output end of the motor driving module, so that the overcurrent protection function can be realized, the anti-interference function of the motor driving circuit can be realized, and the reliability and the accuracy of the motor driving circuit can be improved.
The embodiment also discloses electric equipment which comprises the motor driving circuit and the motor. The electric equipment can be intelligent household appliances such as an air conditioner, a television and a television, and can also be terminal equipment such as mobile equipment and vehicle-mounted equipment, and any combination thereof. In some embodiments, the mobile device may include, for example, a cell phone, a smart home device, a wearable device, a smart mobile device, a virtual reality device, and the like, or any combination thereof.
The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. An overcurrent protection circuit for a motor drive circuit, comprising:
the power supply comprises a comparator, a triode and a first power supply source;
the positive input end of the comparator is used as the first input end of the overcurrent protection circuit and is connected with the first output end of the motor driving module;
the negative input end of the comparator is used as the second input end of the overcurrent protection circuit and is connected with the first output end of the motor driving module;
the output end of the comparator is connected with the base stage of the triode, and the output end of the comparator is also used as the first output end of the overcurrent protection circuit and is connected with the first input end of the motor driving chip;
the collector of the triode is used as a second output end of the overcurrent protection circuit and is connected with a first input end of the motor driving module;
and the emitter of the triode is connected with the first power supply.
2. The overcurrent protection circuit of claim 1 further comprising a first resistor coupled in series between the collector of the transistor and ground.
3. The overcurrent protection circuit of claim 1, further comprising a filter module, the filter module being connected in series between the output of the comparator and the first input of the motor driver chip.
4. The overcurrent protection circuit of claim 3, wherein the filter circuit comprises:
a second resistor and a capacitor;
the first end of the second resistor is connected with the output end of the comparator, and the second end of the second resistor is connected with the first input end of the motor driving chip;
the capacitor is connected between the second end of the second resistor and the ground in series.
5. The overcurrent protection circuit of claim 4 further comprising a third resistor coupled in series between the first power supply and the output of the comparator.
6. The overcurrent protection circuit of claim 1, further comprising:
the second power supply source, the fourth resistor and the fifth resistor;
the fourth resistor is connected in series between the positive input end of the comparator and the first output end of the motor driving module;
the fifth resistor is connected in series between the positive input end of the comparator and the second power supply.
7. The overcurrent protection circuit of claim 6, wherein the fourth resistor and the fifth resistor are variable resistors.
8. A motor drive circuit, comprising:
a motor driving chip, a motor driving module, and the overcurrent protection circuit for a motor driving circuit of any one of claims 1 to 7;
a first input end of the motor driving chip is connected with a first output end of the overcurrent protection circuit; the second input end of the motor driving chip is connected with the second output end of the motor driving module; the output end of the motor driving chip is connected with the second input end of the motor driving module;
a first input end of the motor driving module is connected with a second output end of the overcurrent protection circuit; a first output end of the motor driving module is respectively connected with a first input end and a second input end of the overcurrent protection circuit; and the third output end of the motor driving module is connected with a motor.
9. An electric device comprising the motor drive circuit according to claim 8 and a motor.
10. The electrical device of claim 9, wherein the electrical device is an air conditioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110098448.1A CN114792966A (en) | 2021-01-25 | 2021-01-25 | Overcurrent protection circuit for motor drive circuit, motor drive circuit and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110098448.1A CN114792966A (en) | 2021-01-25 | 2021-01-25 | Overcurrent protection circuit for motor drive circuit, motor drive circuit and electric equipment |
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| Publication Number | Publication Date |
|---|---|
| CN114792966A true CN114792966A (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110098448.1A Pending CN114792966A (en) | 2021-01-25 | 2021-01-25 | Overcurrent protection circuit for motor drive circuit, motor drive circuit and electric equipment |
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| Country | Link |
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| CN (1) | CN114792966A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116154722A (en) * | 2023-04-20 | 2023-05-23 | 成都爱旗科技有限公司 | Protection circuit of three-phase motor and protection method of three-phase motor |
-
2021
- 2021-01-25 CN CN202110098448.1A patent/CN114792966A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116154722A (en) * | 2023-04-20 | 2023-05-23 | 成都爱旗科技有限公司 | Protection circuit of three-phase motor and protection method of three-phase motor |
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