Safety detection circuit of goods channel motor

Abstract

The utility model provides a safety detection circuit of a goods channel motor, which comprises the goods channel motor, and further comprises a motor driving circuit electrically connected with the goods channel motor and used for driving and controlling the goods channel motor; the control unit is connected with the goods channel motor through the motor driving circuit, and the control unit is used for sending a short-time pulse signal to control the goods channel motor to generate pulse current; the current detection circuit is connected with the goods channel motor in series and used for detecting pulse current in the goods channel motor, the state of the spring goods channel motor can be detected in real time, the limitation of an existing detection mode is overcome, potential faults can be found in time at any moment when the motor runs or stops running, and therefore maintenance measures can be taken in advance, and the working efficiency is improved. The operation stability of the goods channel motor is further ensured, and the operation cost is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of freight lane motor control technology, specifically to a safety detection circuit for a freight lane motor. Background Technology

[0002] Vending machines are widely used in modern commercial environments. Among them, spring-loaded conveyors are a common structure for storing and dispensing goods. Spring-loaded conveyors rely on the rotation of a motor to push the goods out. The normal operation of the motor is crucial to ensuring the normal sales function of the vending machine.

[0003] Currently, testing for spring-loaded vending machine motors only detects malfunctions when the motor is running and dispensing goods. This means that the motor's condition cannot be monitored when it is not dispensing. For example, potential problems such as minor short circuits in the windings or early-stage bearing wear cannot be detected in time when the motor is not running. The lack of real-time monitoring capabilities means that faults cannot be detected immediately, potentially leading to situations where vending machines fail to dispense goods, impacting user experience and increasing operating and maintenance costs.

[0004] Therefore, existing technologies still need further development. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a safety detection circuit for a freight channel motor to solve the problems existing in the prior art.

[0006] To achieve the above technical objectives, this utility model provides a safety detection circuit for a freight channel motor, including a freight channel motor, and further comprising:

[0007] A motor drive circuit, electrically connected to the cargo channel motor, is used to drive and control the cargo channel motor;

[0008] A control unit is connected to the cargo channel motor via the motor drive circuit. The control unit is used to send a short-time pulse signal to control the cargo channel motor to generate a pulse current.

[0009] A current detection circuit, connected in series with the cargo channel motor, is used to detect the pulse current in the cargo channel motor.

[0010] Specifically, the current detection circuit includes a current sampling resistor, one end of which is connected to the cargo channel motor, and the other end of which is connected to a reference ground. The current sampling resistor is used to detect the pulse current of the cargo channel motor.

[0011] Specifically, the current detection circuit further includes a first filter capacitor and a filter circuit. The filter circuit includes an input terminal and an output terminal. The first filter capacitor is disposed at the input terminal of the filter circuit and is connected in parallel with the current sampling resistor.

[0012] The filter circuit includes a first resistor and a second filter capacitor.

[0013] Specifically, the current detection circuit also includes a clamping circuit, which is connected to the output of the filter circuit.

[0014] Specifically, the clamping circuit includes a first clamping diode and a second clamping diode, which are connected in series, and the anode of the first clamping diode and the cathode of the second clamping diode are connected.

[0015] Specifically, the input terminal of the filter circuit is connected to the current sampling resistor, and the output terminal of the filter circuit is connected to the anode of the second clamping diode.

[0016] Specifically, the current detection circuit also includes a current detection port, which is electrically connected to the control unit.

[0017] Specifically, the motor drive circuit includes:

[0018] The transistor is electrically connected to the control unit.

[0019] The second resistor is connected to the base of the transistor;

[0020] A third resistor, one end of which is connected to the base of the transistor, and the other end of which is connected to the emitter of the transistor.

[0021] Specifically, the motor drive circuit further includes a fourth resistor and a fifth resistor, which are connected in series.

[0022] One end of the fourth resistor is connected to the collector of the transistor, and the other end of the fourth resistor (R56) is connected to the first power supply.

[0023] One end of the fifth resistor is connected to the collector of the transistor, and the other end of the fifth resistor is connected to the emitter of the transistor.

[0024] Specifically, the motor drive circuit further includes a field-effect transistor, which is electrically connected to the collector of the transistor;

[0025] The drain of the field-effect transistor is electrically connected to the freight channel motor, and the source of the field-effect transistor is connected to the reference ground through a current sampling resistor.

[0026] Beneficial effects:

[0027] This invention provides a safety detection circuit for a cargo channel motor, including a cargo channel motor, a motor drive circuit electrically connected to the cargo channel motor for driving and controlling the cargo channel motor, a control unit connected to the cargo channel motor through the motor drive circuit, and the control unit for sending short-time pulse signals to control the cargo channel motor to generate pulse current; and a current detection circuit connected in series with the cargo channel motor for detecting the pulse current in the cargo channel motor. This invention can detect the status of the spring cargo channel motor in real time, overcome the limitations of existing detection methods, and can promptly detect potential faults at any time when the motor is running or stopped, thereby taking maintenance measures in advance, further ensuring the stability of the cargo channel motor operation, and further reducing operating costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the circuit structure of the safety detection circuit for the freight channel motor provided in a specific embodiment of this utility model;

[0029] The above figures include the following reference numerals:

[0030] M1, cargo channel motor; R1, current sampling resistor; C11, first filter capacitor; R3, first resistor; C10, second filter capacitor; D8, first clamping diode; D9, second clamping diode; Q10, transistor; R58, second resistor; R59, third resistor; R56, fourth resistor; R57, fifth resistor; Q9, field-effect transistor; 100, motor drive circuit; 200, current detection circuit. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, the directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the creation of this utility model.

[0032] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0033] Please see Figure 1 This embodiment provides a safety detection circuit for a cargo channel motor, including a cargo channel motor M1, and further including:

[0034] The motor drive circuit 100 is electrically connected to the cargo channel motor M1 and is used to drive and control the cargo channel motor M1.

[0035] The control unit is connected to the cargo channel motor M1 through the motor drive circuit 100. The control unit is used to send a short-time pulse signal to control the cargo channel motor M1 to generate a pulse current.

[0036] The current detection circuit 200 is connected in series with the cargo channel motor M1 and is used to detect the pulse current in the cargo channel motor M1.

[0037] Understandably, current market testing methods for spring-loaded conveyor motors only allow for monitoring the motor's current when it is rotating and dispensing goods, meaning that the motor's status cannot be monitored when it is not in the dispensing state. This invention provides a safety detection circuit for conveyor motors that uses a control unit to send a short-time pulse signal to the motor drive circuit 100, causing a small pulse current to flow through the conveyor motor M1. The motor detection circuit 200 then detects the current of the conveyor motor M1, and the detected current can determine whether the conveyor motor has a corresponding fault. This eliminates the need for monitoring when the conveyor motor M1 is rotating and dispensing goods, thus achieving real-time status monitoring of the conveyor motor M1.

[0038] See Figure 1 The working process of the safety monitoring circuit for the freight channel motor in this embodiment is as follows:

[0039] The control unit sends a short-time pulse signal to drive the cargo channel motor M1 through the motor drive circuit 100, causing a small pulse current to flow through the cargo channel motor M1. At the same time, since the current detection circuit 200 is connected in series with the cargo channel motor M1, the same current flows through the current detection circuit 200. The current detection circuit 200 processes the detected current signal to obtain information on whether the cargo channel motor M1 has malfunctioned. Because the short-time pulse signal sent by the control unit makes the current through the cargo channel motor M1 small, the cargo channel motor M1 remains static and does not rotate, so it does not affect the normal operation of the cargo channel motor. At the same time, the safety detection of the cargo channel motor M1 is not affected by the normal operation of the spring cargo channel, realizing real-time monitoring of the cargo channel motor M1 and greatly improving the safety and stability of the cargo channel motor.

[0040] See Figure 1 In the safety detection circuit of the cargo lane motor in this embodiment, the current detection circuit 200 includes a current sampling resistor R1. One end of the current sampling resistor R1 is connected to the cargo lane motor M1, and the other end of the current sampling resistor R1 is connected to a reference ground. The current sampling resistor R1 is used to detect the pulse current of the cargo lane motor M1.

[0041] Furthermore, the principle of the current sampling resistor R1 detecting the pulse current of the cargo channel motor M1 includes: when the instantaneous current detected by the current sampling resistor R1 is very large or no current is detected, it indicates that the cargo channel motor M1 has a fault, such as an open circuit or short circuit in the motor coil. This makes it easy to report the fault information to the background in advance and disable the cargo channel. Based on the background information, the maintenance personnel can repair and handle the fault in a timely manner.

[0042] See Figure 1 The current detection circuit 200 further includes a first filter capacitor C11 and a filter circuit. The filter circuit includes an input terminal and an output terminal. The first filter capacitor C11 is disposed at the input terminal of the filter circuit and connected in parallel with the current sampling resistor R1. This makes the capacitive reactance of C11 to high-frequency signals relatively small when there are high-frequency noise signals in the circuit. The high-frequency noise signals will preferentially pass through C11 and be bypassed to ground, reducing the high-frequency noise components entering the filter circuit. This helps to improve the accuracy of signal processing in subsequent circuits and avoids interference of high-frequency noise on the current detection results. The filter circuit itself can further filter the input current signal through its input C11 and internal structure, which is beneficial to the accurate analysis and processing of the current signal by subsequent circuits, and improves the reliability and stability of the entire system including the current detection circuit.

[0043] Preferably, the filter circuit includes a first resistor R3 and a second filter capacitor C10.

[0044] See Figure 1 The current detection circuit 200 also includes a clamping circuit connected to the output of the filter circuit. This helps to limit the output voltage to a safe range, prevent excessive voltage from being transmitted to subsequent circuits, avoid damage to components in the circuit due to excessive voltage, and improve the reliability of the entire circuit system. The clamping circuit can also suppress fluctuations in the output voltage, keeping the voltage output to subsequent circuits relatively stable.

[0045] Specifically, the clamping circuit includes a first clamping diode D8 and a second clamping diode D9, which are connected in series, and the anode of the first clamping diode D8 is connected to the cathode of the second clamping diode D9.

[0046] See Figure 1In some specific embodiments, the anode of the first clamping diode D8 is connected to the node between the first resistor R3 and the second filter capacitor C10, and the cathode of the first clamping diode D8 is connected to a second power supply with a voltage of 3.3V, thereby preventing the voltage from exceeding 3.3V and protecting the circuit. The anode of the second clamping diode D9 is connected to the reference ground, and the cathode of the second clamping diode D9 is connected to the node between the first resistor R3 and the second filter capacitor C10, thereby preventing the voltage from being negative and further protecting the circuit.

[0047] See Figure 1 The input terminal of the filter circuit is connected to the current sampling resistor R1, and the output terminal of the filter circuit is connected to the anode of the second clamping diode D9.

[0048] See Figure 1 The current detection circuit 200 further includes a current detection port, which is electrically connected to the control unit. The current detection port is located after the clamping circuit and is used to output the current of the current sampling resistor R1 to the control unit for calculation and processing.

[0049] See Figure 1 In the safety detection circuit of the freight channel motor in this embodiment, the motor drive circuit 100 includes: a transistor Q10, electrically connected to the control unit, the emitter of the transistor Q10 being connected to a reference ground, and the grounding of the emitter providing a stable reference potential for the transistor Q10, which helps to determine the operating state of the transistor; a second resistor R58, connected to the base of the transistor Q10, used to limit the current flowing into the base; and a third resistor R59, one end of the third resistor R59 being connected to the base of the transistor Q10, and the other end of the third resistor R59 being connected to the emitter of the transistor Q10, the third resistor R59 serving to stabilize the base potential.

[0050] See Figure 1In some specific embodiments, the motor drive circuit 100 further includes a fourth resistor R56 and a fifth resistor R57, which are connected in series. One end of the fourth resistor R56 is connected to the collector of transistor Q10, and the other end of the fourth resistor R56 is connected to a 24V first power supply. One end of the fifth resistor R57 is connected to the collector of transistor Q10, and the other end of the fifth resistor R57 is connected to the emitter of transistor Q10. The fourth resistor R56 and the fifth resistor R57 serve as a separator. The voltage divider function of the resistors is to control the collector potential change when transistor Q10 is in different operating states (conducting, cutoff, or amplifying). The fourth resistor, R56, is connected in series between the collector and the 24V power supply. According to Ohm's law, it limits the collector current. When abnormal conditions occur in the circuit, such as a short circuit in transistor Q10 or an overload in the motor, R56 prevents excessive current from flowing into the circuit from the 24V power supply, thus protecting transistor Q10, the motor M1, and other related circuit components from damage due to excessive current. The fifth resistor, R57, works together with R56 to share some of the voltage when a circuit fault causes an abnormal increase in current, reducing the voltage stress on transistor Q10 and further improving the reliability and safety of the circuit.

[0051] See Figure 1 The motor drive circuit 100 further includes a field-effect transistor Q9, which is electrically connected to the collector of the transistor Q10; the drain of the field-effect transistor Q9 is electrically connected to the freight motor M1, and the source of the field-effect transistor Q9 is connected to the reference ground through a current sampling resistor R1.

[0052] Specifically, one end of the cargo channel motor M1 is connected to the drain of the field-effect transistor Q9, and the other end of the cargo channel motor M1 is connected to a 24V first power supply.

[0053] Preferably, an NMOS transistor is selected as the field-effect transistor Q9.

[0054] Furthermore, the current sampling resistor R1 also belongs to the motor drive circuit 100. The current sampling resistor R1 can provide a suitable bias voltage for the field effect transistor Q9, ensuring that the field effect transistor Q9 works in the appropriate working area when the cargo conveyor motor M1 is rotating normally to deliver goods, thereby realizing the normal amplification of the input signal.

[0055] Furthermore, the working process of the motor drive circuit is as follows:

[0056] When the control signal outputs a low - level pulse, that is, when it is at a low level, Q10 is not conducting. Due to the voltage division of R56 and R57, the gate - source voltage Ugs of pin 1 of Q9 satisfies Ugs > Ugs(th) > 0V, so Q9 conducts. When the low - level time is short enough, the lane motor will only generate an instantaneous current pulse and will not rotate (when the lane motor is idle and not in the shipping state). When the low - level time is long enough, the lane motor will generate a current pulse and will rotate (when the lane motor is working and in the shipping state); when the pulse changes from low level to high level, Q10 conducts, and the gate - source voltage Ugs of pin 1 of Q9 satisfies Ugs ≈ 0 < Ugs(th), so the Q9 transistor turns off, the negative electrode of the lane motor is not connected, and the motor has no current and does not work.

[0057] In some specific embodiments, there are multiple lane motors M1, each lane motor M1 corresponds to a lane, and the multiple lane motors are connected in parallel, that is, the multiple lane motors M1 are connected in parallel to a current detection circuit 200.

[0058] It should be noted here that this embodiment provides a safety detection circuit for a lane motor, including a lane motor, an electric - machine drive circuit electrically connected to the lane motor for driving and controlling the lane motor; a control unit is connected to the lane motor through the electric - machine drive circuit, and the control unit is used to send a short - time pulse signal to control the lane motor to generate a pulse current; a current detection circuit is connected in series with the lane motor for detecting the pulse current in the lane motor. The utility model can detect the state of the spring lane motor in real time, overcomes the limitations of the existing detection methods, can timely discover potential faults at any moment when the motor is running or stopped, so as to take maintenance measures in advance, further ensures the stability of the operation of the lane motor, and further reduces the operation cost.

[0059] The above - described technical features can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification as long as such a combination does not exist in contradiction.

[0060] The above - described specific embodiments of the present utility model do not constitute a limitation to the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model should be included within the protection scope of the claims of the present utility model.

Claims

1. A safety detection circuit for a cargo channel motor, comprising a cargo channel motor (M1), characterized in that, Also includes: The motor drive circuit (100) is electrically connected to the cargo channel motor (M1) and is used to drive and control the cargo channel motor (M1); The control unit is connected to the cargo channel motor (M1) through the motor drive circuit (100), and the control unit is used to send short-time pulse signals to control the cargo channel motor (M1) to generate pulse current; A current detection circuit (200) is connected in series with the cargo channel motor (M1) to detect the pulse current in the cargo channel motor (M1).

2. The safety detection circuit for the freight channel motor according to claim 1, characterized in that, The current detection circuit (200) includes a current sampling resistor (R1), one end of which is connected to the cargo channel motor (M1), and the other end of which is connected to a reference ground. The current sampling resistor (R1) is used to detect the pulse current of the cargo channel motor (M1).

3. The safety detection circuit for the freight channel motor according to claim 2, characterized in that, The current detection circuit (200) further includes a first filter capacitor (C11) and a filter circuit. The filter circuit includes an input terminal and an output terminal. The first filter capacitor (C11) is disposed at the input terminal of the filter circuit and is connected in parallel with the current sampling resistor (R1). The filter circuit includes a first resistor (R3) and a second filter capacitor (C10).

4. The safety detection circuit for the freight channel motor according to claim 3, characterized in that, The current detection circuit (200) also includes a clamping circuit, which is connected to the output of the filter circuit.

5. The safety detection circuit for the freight channel motor according to claim 4, characterized in that, The clamping circuit includes a first clamping diode (D8) and a second clamping diode (D9), which are connected in series. The anode of the first clamping diode (D8) and the cathode of the second clamping diode (D9) are connected together.

6. The safety detection circuit for the freight channel motor according to claim 5, characterized in that, The input terminal of the filter circuit is connected to the current sampling resistor (R1), and the output terminal of the filter circuit is connected to the anode of the second clamping diode (D9).

7. The safety detection circuit for the freight channel motor according to claim 2, characterized in that, The current detection circuit (200) also includes a current detection port, which is electrically connected to the control unit.

8. The safety detection circuit for the freight channel motor according to claim 1, characterized in that, The motor drive circuit (100) includes: Transistor (Q10) is electrically connected to the control unit; The second resistor (R58) is connected to the base of the transistor (Q10); The third resistor (R59) has one end connected to the base of the transistor (Q10) and the other end connected to the emitter of the transistor (Q10).

9. The safety detection circuit for the freight channel motor according to claim 8, characterized in that, The motor drive circuit (100) further includes a fourth resistor (R56) and a fifth resistor (R57), which are connected in series. One end of the fourth resistor (R56) is connected to the collector of the transistor (Q10), and the other end of the fourth resistor (R56) is connected to the first power supply. One end of the fifth resistor (R57) is connected to the collector of the transistor (Q10), and the other end of the fifth resistor (R57) is connected to the emitter of the transistor (Q10).

10. The safety detection circuit for the freight channel motor according to claim 9, characterized in that, The motor drive circuit (100) further includes a field-effect transistor (Q9), which is electrically connected to the collector of the transistor (Q10); The drain of the field-effect transistor (Q9) is electrically connected to the freight motor (M1), and the source of the field-effect transistor (Q9) is connected to the reference ground through the current sampling resistor (R1).

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