Two-wire dc motor circuit detection system

Abstract

The application relates to a circuit detection system for a two-wire DC motor, which comprises a main control module comprising a control chip and a motor driving module electrically connected to the main control module, wherein the motor driving module comprises motor insertion terminals, an insertion detection module and a locked-rotor detection module; the motor insertion terminals are used for being electrically connected to conductive terminals of the two-wire DC motor; the insertion detection module is used for detecting whether the two-wire DC motor is electrically connected to the motor driving module; and the locked-rotor detection module is used for detecting whether the two-wire DC motor is locked. Thus, the circuit detection system for the two-wire DC motor can effectively detect the circuit electrical connection and the locked-rotor state of the two-wire DC motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit detection, and particularly relates to a circuit detection system for two-wire DC motor. BACKGROUND

[0002] DC motor is an electric motor that converts DC power into mechanical energy, and is widely used in electric drive due to its good speed regulation performance. In industrial practice, problems such as stall often occur during the use of two-wire DC motor. The power factor is very low when the motor is stalled, and the current can reach up to 7 times the rated current. If the time is too long, the motor will be burned out, resulting in property loss. At the same time, it is also a common problem that the working state of the motor cannot be detected in real time due to the lack of effective electrical connection between the motor power supply and the motor drive module. However, there is a lack of detection system for the electrical connection and stall state of two-wire DC motor in reality. Therefore, the circuit detection system of two-wire DC motor is of great significance to ensure the safe use of two-wire DC motor. SUMMARY

[0003] An advantage of the present application is to provide a circuit detection system for two-wire DC motor, wherein the circuit detection system can effectively detect whether the two-wire DC motor is electrically connected with the motor drive module.

[0004] Another advantage of the present application is to provide a circuit detection system for two-wire DC motor, wherein the circuit detection system can effectively reduce the time cost of the user and improve the work efficiency.

[0005] Another advantage of the present application is to provide a circuit detection system for two-wire DC motor, wherein the circuit detection system can effectively detect whether the two-wire DC motor is stalled.

[0006] Another advantage of the present application is to provide a circuit detection system for two-wire DC motor, wherein the circuit detection system can effectively protect the safety of the motor.

[0007] Another advantage of the present application is to provide a circuit detection system for two-wire DC motor, wherein the circuit detection system of the two-wire DC motor is simple in structure and low in cost.

[0008] To achieve the above at least one advantage, the application provides a circuit detection system of a two-wire DC motor, comprising: a main control module of a control chip; a motor driving module electrically connected to the main control module, comprising a motor insertion terminal, an insertion detection module and a locked-rotor detection module, the motor insertion terminal is used for electrically connecting to a conductive terminal of the two-wire DC motor, the insertion detection module is used for detecting whether the two-wire DC motor is electrically connected with the motor driving module, and the locked-rotor detection module is used for detecting whether the two-wire DC motor occurs locked-rotor.

[0009] In the circuit detection system of the two-wire DC motor provided by the application, the insertion detection module comprises: a resistor R17, a MOS tube Q3, and a detection port electrically connected to the MOS tube Q3, wherein, when the insertion detection is performed, a pin in the control chip for controlling the motor driving module outputs low level, when the motor insertion terminal is not inserted into the conductive terminal of the two-wire DC motor, the MOS tube Q3 works in the cutoff region, and the detection port is high level; when the motor insertion terminal is inserted into the conductive terminal of the two-wire DC motor, the MOS tube Q3 works in the saturation region, and the detection port is high level.

[0010] In the circuit detection system of the two-wire DC motor provided by the application, the locked-rotor detection module comprises: a transistor Q1, a transistor Q2, a diode D1, a diode D2, a resistor R8, a resistor R5, the MOS tube Q3 and an operational amplifier chip, which are electrically connected according to a preset circuit, wherein, when the locked-rotor detection is performed, the pin in the control chip for controlling the motor driving module outputs high level, in response to the locked-rotor of the two-wire DC motor, the current flowing through the resistor R8 increases, the voltage of the resistor R8 rises, and the operational amplifier chip controls the pin in the control chip for controlling the motor driving module to output low level, so as to protect the two-wire DC motor.

[0011] In the circuit detection system of the two-wire DC motor provided by the application, the transistor Q1 and the transistor Q4 form a totem pole structure of transistors, which are used for controlling the MOS tube Q3.

[0012] In the circuit detection system of the two-wire DC motor provided by the application, the diode D1 and the diode D2 are configured to control the voltage electrically connected to the operational amplifier chip to be lower than a preset threshold value.

[0013] In another two-wire DC motor circuit detection system provided by the present application, a main control module including a control chip; and a motor drive module electrically connected to the main control module, including resistors R16, R13, a MOS tube Q3, a transistor Q4, a resistor R14, a resistor R18, a MOS tube Q3, a resistor R17, a resistor R11, a resistor R8, a resistor R6, a diode D3, a resistor R15, a transistor Q2, a detection port, a resistor R7, a diode D1, a diode D2, a capacitor C3, a resistor R5, an operational amplifier chip, a resistor R10, a resistor R9, a resistor R12 and a capacitor C6 electrically connected according to a preset circuit, wherein, when performing insertion detection, a pin for controlling the motor drive module in the control chip outputs a low level, when the motor insertion terminal is not inserted into the conductive terminal of the two-wire DC motor, the MOS tube Q3 works in a cutoff region, and the detection port is at a high level; when the motor insertion terminal is inserted into the conductive terminal of the two-wire DC motor, the MOS tube Q3 works in a saturation region, and the detection port is at a high level.

[0014] In another two-wire DC motor circuit detection system provided by the present application, when performing stall detection, a pin for controlling the motor drive module in the control chip outputs a high level, in response to the two-wire DC motor stalling, the current flowing through the resistor R8 increases, the voltage of the resistor R8 rises, and the operational amplifier chip controls the pin for controlling the motor drive module in the control chip to output a low level, so as to protect the two-wire DC motor.

[0015] In another two-wire DC motor circuit detection system provided by the present application, the transistor Q1 and the transistor Q4 form a totem pole structure of transistors, for controlling the MOS tube Q3.

[0016] In another two-wire DC motor circuit detection system provided by the present application, the diode D1 and the diode D2 are configured to control the voltage electrically connected to the operational amplifier chip to be lower than a preset threshold value.

[0017] The further objects and advantages of the present application will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0018] The objects, features and advantages of the present application will be better understood from the following detailed description taken in conjunction with the accompanying drawings and claims. BRIEF DESCRIPTION OF DRAWINGS

[0019] These and / or other aspects and advantages of the present application will become more apparent and be more readily understood from the following detailed description, taken in conjunction with the accompanying drawings, in which: Figure 1Fig. 1 illustrates a system schematic diagram of a two-wire DC motor circuit detection system according to an embodiment of the present application.

[0020] Figure 2 Fig. 1 illustrates a system schematic diagram of a two-wire DC motor circuit detection system according to an embodiment of the present application.

[0021] Figure 3 Fig. 1 illustrates a system schematic diagram of a two-wire DC motor circuit detection system according to an embodiment of the present application.

[0022] Figure 4 Fig. 1 illustrates a system schematic diagram of a two-wire DC motor circuit detection system according to an embodiment of the present application.

[0023] Figure 5 Fig. 1 illustrates a system schematic diagram of a two-wire DC motor circuit detection system according to an embodiment of the present application.

[0024] Figure 6 Fig. 1 illustrates a system schematic diagram of a two-wire DC motor circuit detection system according to an embodiment of the present application.

[0025] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used to enable a clear and consistent in understanding of the application. Therefore, it is apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustration purpose only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.

[0026] It is understood that the term "one" should be construed to "at least one" or "one or more" to mean that a quantity of an element can be either one or more than one. The term "plurality" shall mean a quantity of more than one.

[0027] Although numerals such as "first", "second", or the like will be used in describing various components, they are not limited to those components. The terms are used only to distinguish a component from another. For example, a first component could be termed a second component, and, similarly, a second component could be also termed a first component without departing from the teachings of the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "has," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0029] Example two-wire DC motor circuit detection system Figure 1 A system schematic diagram of a two-wire DC motor circuit detection system according to a preferred embodiment of the present application is shown in FIG. 1. Figure 1 As shown, the two-wire DC motor circuit detection system 10 according to the preferred embodiment of the present application includes a main control module 11 of a control chip, which is responsible for information collection, storage, analysis and decision-making of the detection system; a motor driving module 12 electrically connected to the main control module, which includes a motor insertion terminal 21, an insertion detection module 22 and a locked-rotor detection module 23, the motor insertion terminal 21 is used for electrical connection to a conductive terminal of a two-wire DC motor, the insertion detection module 22 is used for detecting whether the two-wire DC motor is electrically connected to the motor driving module 12, and the locked-rotor detection module 23 is used for detecting whether the two-wire DC motor is locked-rotor.

[0030] In a possible implementation of the present application, the insertion detection module 22 includes a resistor R17, a MOS tube Q3, and a detection port electrically connected to the MOS tube Q3, wherein, during insertion detection, a pin of the control chip for controlling the motor driving module 12 outputs a low level, when the motor insertion terminal 21 is not inserted into the conductive terminal of the two-wire DC motor, the MOS tube Q3 works in the cutoff region, and the detection port is at a high level; when the motor insertion terminal is inserted into the conductive terminal of the two-wire DC motor, the MOS tube Q3 works in the saturation region, and the detection port is at a high level.

[0031] In a possible implementation of the present application, the locked-rotor detection module 23 includes a triode Q1, a triode Q2, a diode D1, a diode D2, a resistor R8, a resistor R5, the MOS tube Q3 and an operational amplifier chip electrically connected according to a preset circuit, wherein, during locked-rotor detection, a pin of the control chip for controlling the motor driving module 12 outputs a high level, in response to locked-rotor of the two-wire DC motor, current flowing through the resistor R8 increases, voltage of the resistor R8 rises, and the operational amplifier chip controls the pin of the control chip for controlling the motor driving module 12 to output a low level, so as to protect the two-wire DC motor.

[0032] Specifically, in the above possible implementations, transistors Q1 and Q4 form a totem-pole structure for controlling the MOS transistor Q3.

[0033] Specifically, in the above possible implementations, diodes D1 and D2 are configured to control the voltage electrically connected to the operational amplifier chip to be lower than a preset threshold.

[0034] Figures 2 to 6 The illustration shows a specific example of the circuit detection system according to an embodiment of this application. For example... Figures 2 to 6 As shown, the circuit detection system 10 includes a main control module 11 with a control chip and a motor drive module 12 electrically connected to the main control module, wherein... Figures 2 to 5 The diagram illustrates the circuit structure of the main control module described in this specific example, wherein, Figure 2 The illustration shows an example of the control chip of the main control module in this specific example. Figures 3 to 5 The illustration shows other necessary electronic components in the main control module described in this specific example. It should be understood that in other examples of this application, the main control module may also include other electronic components, or the same electronic components may be arranged in other ways, as long as they can achieve the preset control functions. Figure 6 The diagram illustrates the circuit structure of the motor drive module 12 in this specific example, as follows: Figure 6 As shown, the motor drive module 12 is electrically connected according to a preset circuit, including resistors R16, R13, MOSFET Q3, transistor Q4, R14, R18, MOSFET Q3, R17, R11, R8, R6, diode D3, R15, transistor Q2, a detection port, resistor R7, diode D1, diode D2, capacitor C3, resistor R5, an operational amplifier chip, resistors R10, R9, R12, and capacitor C6. This should be understood. Figure 6 The illustrated motor drive module is for illustrative purposes only. In other examples of this application, the motor drive module may also include other electronic components, or the same electronic components may be connected in other circuit forms, as long as they can complete the preset function. This is not limited to this application.

[0035] Specifically, when the circuit detection system is in operation: during insertion detection, the pin of the control chip used to control the motor drive module 12 outputs a low level. When the motor insertion terminal is not inserted into the conductive terminal of the two-wire DC motor, the MOS transistor Q3 operates in the cutoff region, and the detection port is at a high level. When the motor insertion terminal is inserted into the conductive terminal of the two-wire DC motor, the MOS transistor Q3 operates in the saturation region, and the detection port is at a high level.

[0036] More specifically, after the power-on U1 chip works normally, the pin PA4 outputs a low level, at this time the MOS tube Q3 (MOS tube) works in the cutoff zone, if the terminal P1 does not insert the motor, the label "Motor" is 0V through the R17 pull-down resistor, so the transistor Q2 works in the cutoff zone. At this time, the detection label "Motor-C" is high level.

[0037] Further, if the terminal P1 is inserted into the motor, because the motor resistance is very small, 12V passes through the motor resistors R8, R11, R15, at this time the transistor Q2 works in the saturation zone, at this time the detection label "Motor-C" is low level. In the process of detecting the locked rotor, the pin of the control chip for controlling the motor drive module 12 outputs high level, in response to the locked rotor of the two-wire DC motor, the current flowing through the resistor R8 increases, the voltage of the resistor R8 rises, and the operational amplifier chip controls the pin of the control chip for controlling the motor drive module 12 to output low level, so as to protect the two-wire DC motor.

[0038] More specifically, in particular, after the power-on U1 chip works normally, the pin PA4 outputs a high level, if it is judged that the terminal P1 has been inserted into the motor, the single-chip microcomputer PA4 pin outputs a high level, at this time the transistor Q1 is turned on, the MOS tube Q3 (MOS tube) is also turned on, the detection label "Motor" is low level at this time, the transistor Q2 is turned on, and the detection label "Motor-C" is low level.

[0039] Further, if the motor is locked, the current flowing through the resistor R8 increases at this time, the voltage of the resistor R8 rises. After being output to the single-chip microcomputer through the operational amplifier U2, the single-chip microcomputer PA4 pin outputs low level, so as to protect the motor and the MOS tube Q3 (MOS tube) from being damaged.

[0040] Further, the diode D1 and the diode D2 are used to clamp the voltage on the left side of the resistor R5 to 3.3+0.7V through the resistor R6 and the diode D1 when the motor is inserted into the terminal P1 and not running, so as to prevent a very high voltage from being connected to the operational amplifier U2. In particular, the signal is directly connected to the AD pin of the main control chip without passing through the operational amplifier, and the main control chip is also protected due to the presence of the diode D1.

[0041] In particular, in this specific example, the transistor Q1 and the transistor Q4 form a totem pole structure of transistors, which is used to control the MOS tube Q3.

[0042] In particular, in this specific example, the diode D1 and the diode D2 are configured to control the voltage connected to the operational amplifier chip to be lower than a preset threshold value.

[0043] It is worth mentioning that the structure inside the MOS determines that a relatively large current is needed to turn on the MOS, which can make the MOS quickly cross the platform area (at this time only the current is increased without increasing the voltage), so the MOS generates less heat. When the single-chip microcomputer PA4 is high, the transistor Q1 is turned on, and 3.3V directly passes through the transistor Q1 and the resistor R14 to quickly turn on the MOS. When the single-chip microcomputer PA4 is low, the transistor Q1 is not turned on, and since the MOS Q3 (MOS) GS has a junction capacitor with electricity, it can quickly discharge through the resistor R14 and the transistor Q4. In this way, the MOS Q3 (MOS) can work in high-frequency switching. Further, the M7 functions to input the reverse electromotive force generated by the motor to 12V when the motor is immediately stopped, thereby playing a backflow role.

[0044] The above describes the basic principles of the present application in combination with specific embodiments, but it should be pointed out that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects, etc. cannot be considered as the must-have of each embodiment of the present application. In addition, the above-mentioned specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the present application, and the above-mentioned specific details are not limited to the present application.

[0045] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only exemplary examples and are not intended to require or imply the connection, arrangement, configuration shown in the block diagram. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any way. Words such as "include", "contain", "have" and the like are open-ended words, which mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0046] It should also be noted that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombination should be considered as equivalent solutions of the present application.

[0047] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0048] It is understood by those skilled in the art that the foregoing description and the embodiments of the application shown in the drawings are only by way of example and do not limit the application. The object of the application has been fully and effectively achieved. The functional and structural principles of the application have been shown and described in the embodiments, and the embodiments of the application can be modified or changed in any way without departing from the principles.

Claims

1. A circuit detection system for a two-wire DC motor, characterized by, The utility model relates to a kind of motor driver, including: Including the main control module of control chip; And motor drive module electrically connected to the main control module, including motor insertion terminal, insertion detection module and locked rotor detection module, the motor insertion terminal is used to be electrically connected to the conductive terminal of two-wire DC motor, the insertion detection module is used to detect whether the two-wire DC motor is electrically connected with the motor drive module; The locked rotor detection module is used to detect whether the two-wire DC motor is locked rotor; The insertion detection module includes: resistance R17, MOS tube Q3, detection port electrically connected to the MOS tube Q3, the both ends of resistance R17 are connected at the drain and source of MOS tube Q3, and the detection port is located at the connection of the drain of MOS tube Q3 and resistance R17, i.e.: the drain of MOS tube Q3; Resistance R17 and triode Q1, MOS tube Q3, triode Q4, resistance R18, resistance R14, resistance R13 and resistance R16 constitute motor drive module;One end of resistance R16 is grounded, the other end of resistance R16 is connected with one end of resistance R13, the other end of resistance R13 is connected with the base of triode Q1 and the base of triode Q4 respectively, the collector of triode Q4 is grounded, one end of resistance R14 is connected with the emitter of triode Q1 and the emitter of triode Q4 respectively, the other end of resistance R14 is connected with one end of resistance R18 and the gate of MOS tube Q3 respectively, the other end of resistance R18 is grounded with the source of MOS tube Q3, the both ends of resistance R17 are connected at the drain and source of MOS tube Q3; Resistance R11, resistance R15, triode Q2 and resistance R7 constitute detection circuit, one end of resistance R11 is connected with the drain of MOS tube Q3, the other end of resistance R11 is connected with one end of resistance R15 and the base of triode Q2 respectively, the other end of resistance R15 is connected with the emitter of triode Q2 and grounded, one end of resistance R7 is connected on the collector of triode Q2, the other end of resistance R7 is connected to VCC3V3 of main control module;Detection label "Motor-C” is connected on the collector of triode Q2; Wherein, when carrying out insertion detection, the pin for controlling the motor drive module in the control chip outputs low level, when the motor insertion terminal is not inserted the conductive terminal of the two-wire DC motor, the MOS tube Q3 works in cut-off area, i.e.: when MOS tube Q3 is cut off: When motor is not inserted, resistance R17, resistance R15, resistance R11 is directly or indirectly grounded, the voltage at the drain of MOS tube Q3 is 0, i.e. low level, triode Q2 works in cut-off area, detection label "Motor-C” is high level; When motor is inserted, it is equal to short terminal P1, 12V passes through terminal P1, resistance R8 raises the voltage at the drain of MOS tube Q3 to 12V, triode Q2 is turned on, detection label "Motor-C” is low level.

2. The circuit detection system of claim 1, wherein, The stall detection module comprises a transistor Q1, a transistor Q2, a diode D1, a diode D2, a resistor R8, a resistor R5, a MOS tube Q3 and an operational amplifier chip which are electrically connected according to a preset circuit; the collector of the transistor Q1 is connected to VCC 3V3 of the main control module; the emitter of the transistor Q1 is connected to one end of a resistor R14 and the emitter of a transistor Q4; the other end of the resistor R14 is electrically connected to the gate of the MOS tube Q3; the base of the transistor Q2 is connected to one end of a resistor R11; the other end of the resistor R11 is connected to the drain of the MOS tube Q3; one end of the resistor R8 is connected to the drain of the MOS tube Q3; the other end of the resistor R8 is connected to one end of a resistor R6; the other end of the resistor R6 is electrically connected to the anode of the diode D1, the cathode of the diode D2 and one end of the resistor R5; the other end of the resistor R5 is electrically connected to the operational amplifier chip; the cathode of the diode D1 is connected to VCC 3V3 of the main control module; and the anode of the diode D2 is grounded. In the stall detection process, the pin for controlling the motor drive module in the control chip outputs a high level; in response to the stall of the two-wire DC motor, the current flowing through the resistor R8 increases, the voltage of the resistor R8 rises, and the operational amplifier chip controls the pin for controlling the motor drive module in the control chip to output a low level, so as to protect the two-wire DC motor.

3. The circuit detection system of claim 2, wherein, The transistor Q1 and the transistor Q4 form a totem pole structure of transistors for controlling the MOS tube Q3.

4. The circuit detection system of claim 2, wherein, The diode D1 and the diode D2 are configured to control the voltage electrically connected to the operational amplifier chip to be lower than a preset threshold value.

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