Motor forward and reverse driving circuit and system

Abstract

The application discloses a motor forward and reverse rotation driving circuit and system. The motor forward and reverse rotation driving circuit comprises a reference voltage providing circuit, the reference voltage providing circuit having a reference voltage output end; a first reference voltage providing circuit, the first reference voltage providing circuit having a first reference voltage output end; and a first comparator circuit, the reference voltage output end and the first reference voltage output end being connected to the first comparator circuit respectively; wherein the reference voltage gradually changes from a first reference voltage to a second reference voltage, the first reference voltage is between the first reference voltage and the second reference voltage, the reference voltage is less than the first reference voltage in a first time period and greater than the first reference voltage in a second time period, and the first time period and the second time period do not overlap; and a motor driving circuit, the first comparator circuit being connected to the motor driving circuit. In the implementation of the motor forward and reverse rotation, a single-chip microcomputer is not needed, the cost is reduced, and software burning is not needed, so that the production process is simple.

Description

Technical Field

[0001] This utility model relates to the field of motor control technology, specifically to a motor forward and reverse rotation drive circuit and system. Background Technology

[0002] Electric motors are an indispensable component in product automation or mechanical structures. Currently, motor operation is often achieved by using a microcontroller to control a driver chip to achieve forward and reverse rotation. Taking an ion fan as an example, the high-voltage discharge needle of the ion fan needs to be dusted before it can start working.

[0003] In related technologies, when using ion blowers for dust removal, it is necessary to control the forward and reverse rotation of the motor to achieve the effect of double-sided dust removal by the high-voltage discharge needle. The forward and reverse rotation of the motor is achieved by a microcontroller-controlled driver chip. In mass production, an additional software programming process is required, which makes the process complex and costly. Utility Model Content

[0004] The main technical problem this invention solves is that the method of controlling the motor to rotate forward and reverse using a microcontroller-driven chip results in complex processes and high costs.

[0005] According to a first aspect, one embodiment of this application provides a motor forward and reverse rotation drive circuit, comprising:

[0006] A reference voltage providing circuit, wherein the reference voltage providing circuit has a reference voltage output terminal, the reference voltage output terminal being used to output a reference voltage;

[0007] A first reference voltage providing circuit, the first reference voltage providing circuit having a first reference voltage output terminal, the first reference voltage output terminal being used to output a first reference voltage;

[0008] A first comparator circuit is connected to the reference voltage output terminal and the first reference voltage output terminal, respectively. The first comparator circuit receives the reference voltage and the first reference voltage, and outputs a first level signal when the reference voltage is less than the first reference voltage, and outputs a second level signal when the reference voltage is greater than the first reference voltage. The reference voltage gradually changes from the first reference voltage to the second reference voltage, and the first reference voltage is located between the first reference voltage and the second reference voltage, such that the reference voltage is less than the first reference voltage in a first time period and greater than the first reference voltage in a second time period, and the first time period and the second time period do not overlap.

[0009] The motor drive circuit includes a first comparator circuit connected to the motor drive circuit, which is used to connect to a motor. The motor drive circuit is also used to output a first drive signal to the motor in response to a first level signal to cause the motor to rotate in a first direction, and to output a second drive signal to the motor in response to a second level signal to cause the motor to rotate in a second direction, wherein the first direction and the second direction are opposite directions.

[0010] In one embodiment, the first comparator circuit includes:

[0011] A first comparator sub-circuit, comprising a first input terminal, a second input terminal, and a first output terminal, wherein the reference voltage output terminal is connected to the first input terminal, and the first reference voltage output terminal is connected to the second input terminal, the first comparator sub-circuit being used to receive the reference voltage and the first reference voltage, and outputting a first level signal when the reference voltage is less than the first reference voltage;

[0012] The second comparator sub-circuit includes a third input terminal, a fourth input terminal, and a second output terminal. The reference voltage output terminal is connected to the third input terminal, and the first reference voltage output terminal is connected to the fourth input terminal. The second comparator sub-circuit is used to receive the reference voltage and the first reference voltage, and outputs a second level signal when the reference voltage is greater than the first reference voltage.

[0013] In one embodiment, both the first level signal and the second level signal are either high-level signals or low-level signals, the motor rotates in the first direction as a forward rotation, and the motor rotates in the second direction as a reverse rotation.

[0014] In one embodiment, the reference voltage providing circuit includes: a first resistor, a charging / discharging capacitor, and a diode D1;

[0015] One end of the first resistor is connected to the power supply, the other end of the first resistor is connected to one end of the charging and discharging capacitor, the other end of the charging and discharging capacitor is grounded, the positive terminal of the diode D1 is connected to one end of the charging and discharging capacitor, and the negative terminal of the diode D1 is used to connect to the power supply.

[0016] The connection point between the charging / discharging capacitor and the first resistor is the reference voltage output terminal; when the charging / discharging capacitor is in a charging state, it is gradually charged, and the reference voltage output by the reference voltage output terminal gradually changes from the first reference voltage to the second reference voltage.

[0017] In one embodiment, the first reference voltage providing circuit includes: a first voltage divider circuit, wherein the voltage input terminal of the first voltage divider circuit is used to connect to a power supply, and the voltage output terminal of the first voltage divider circuit is the first reference voltage output terminal.

[0018] In one embodiment, the system further includes a power supply access circuit, which is connected to the motor drive circuit and is used to connect to a power supply to supply power to the motor drive circuit.

[0019] In one embodiment, the power supply access circuit includes:

[0020] A switching circuit, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal is used to connect to the power supply, and the second terminal is connected to the motor drive circuit;

[0021] A second reference voltage providing circuit has a second reference voltage output terminal, which is used to output a second reference voltage, which is greater than the first reference voltage.

[0022] The second comparator circuit includes a fifth input terminal, a sixth input terminal, and a third output terminal. The reference voltage output terminal is connected to the fifth input terminal, the second reference voltage output terminal is connected to the sixth input terminal, and the third output terminal is connected to the control terminal of the switching circuit. The second comparator circuit is used to connect the reference voltage and the second reference voltage. The second reference voltage is located between the first reference voltage and the second reference voltage. When the reference voltage is less than the second reference voltage, the second comparator circuit outputs a third level signal to the control terminal of the switching circuit.

[0023] When the control terminal of the switching circuit is connected by the third level signal, the first terminal and the second terminal are in a conducting state.

[0024] In one embodiment, the second reference voltage is less than the second reference voltage.

[0025] In one embodiment, the second reference voltage supply circuit includes: a second voltage divider circuit, the voltage input terminal of the second voltage divider circuit is connected to the power supply, the voltage output terminal of the second voltage divider circuit is the second reference voltage output terminal, when the reference voltage is greater than or equal to the second reference voltage, the second comparator circuit is used to output a fourth level signal to the control terminal of the switching circuit, and when the conduction signal of the control terminal of the switching circuit is the fourth level signal, the first terminal and the second terminal are in an open state.

[0026] According to a second aspect, this application provides a motor forward and reverse rotation drive system, including: a printed circuit board, on which the motor forward and reverse rotation drive circuit described above is integrated.

[0027] According to the motor forward and reverse rotation drive circuit and system of the above embodiments, when realizing the forward and reverse rotation of the motor, a reference voltage is provided by a reference voltage providing circuit. The reference voltage gradually changes from a first reference voltage to a second reference voltage. A first reference voltage is provided by a first reference voltage providing circuit. In the first time period, the reference voltage is less than the first reference voltage. At this time, the first comparator circuit outputs a first level signal to the motor drive circuit to drive the motor to rotate in the first direction. In the second time period, the reference voltage is greater than the first reference voltage. At this time, the first comparator circuit outputs a second level signal to the motor drive circuit to drive the motor to rotate in the second direction. No microcontroller is required, which reduces costs. Furthermore, no software programming is required, simplifying the process during mass production. Attached Figure Description

[0028] Figure 1 This is a block diagram illustrating the principle of driving a motor using a microcontroller in existing technologies.

[0029] Figure 2 This is a schematic block diagram of a motor forward and reverse rotation drive circuit according to one embodiment;

[0030] Figure 3 This is a circuit diagram showing the connection between the reference voltage supply circuit and the first reference voltage supply circuit in one embodiment;

[0031] Figure 4 This is a connection circuit diagram of the power supply circuit and the motor drive circuit in one embodiment.

[0032] Figure 5 This is a block diagram illustrating the control principle of a motor forward and reverse rotation drive circuit in one embodiment.

[0033] Reference numerals: 100, Reference voltage supply circuit; 200, First reference voltage supply circuit; 201, First voltage divider circuit; 300, First comparator circuit; 301, First comparator sub-circuit; 302, Second comparator sub-circuit; 400, Motor drive circuit; 500, Motor; 600, Power supply access circuit; 601, Second reference voltage supply circuit; 6011, Second voltage divider circuit; 602, Second comparator circuit; 603, Switching circuit; 700, Power supply. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0035] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0036] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0037] Before application, the high-voltage discharge needle of the ion fan needs to be dusted on both sides by rotating the ion fan forward and reverse. In practical applications, one forward and one reverse rotation of the motor is sufficient to dust both sides of the high-voltage discharge needle. Figure 1 As shown, current ion blowers use a microcontroller to control the motor drive circuit to achieve forward and reverse rotation of the motor, thus enabling dust removal on both sides of the high-voltage discharge needle. While microcontroller-controlled motor drive circuits can achieve dust removal on both sides of the high-voltage discharge needle, this method is costly and requires an additional software programming step during mass production, making the process complex.

[0038] To address the aforementioned issues—namely, the high cost of using a microcontroller-controlled driver chip to achieve dust removal on both sides of a high-voltage discharge needle, and the complexity of mass production requiring additional software programming—this application provides a motor forward and reverse rotation drive circuit. This circuit achieves forward and reverse rotation of the motor through a reference voltage supply circuit, a first reference voltage supply circuit, a first comparator circuit, and a motor drive circuit. It eliminates the need for a microcontroller, reducing costs, and simplifies the mass production process by eliminating the need for software programming.

[0039] The forward and reverse rotation drive circuit of the motor disclosed in this application will be described below.

[0040] In some embodiments, such as Figure 2 As shown, the motor forward and reverse rotation drive circuit may include a reference voltage supply circuit 100, a first reference voltage supply circuit 200, a first comparator circuit 300, and a motor drive circuit 400.

[0041] The reference voltage providing circuit 100 has a reference voltage output terminal, which is used to output a reference voltage. The first reference voltage providing circuit 200 has a first reference voltage output terminal, which is used to output a first reference voltage. The reference voltage output terminal and the first reference voltage output terminal are respectively connected to the first comparator circuit 300.

[0042] The first comparator circuit 300 is connected to the motor drive circuit 400. The first comparator circuit 300 is used to receive a reference voltage and a first reference voltage, and outputs a first level signal when the reference voltage is less than the first reference voltage, and outputs a second level signal when the reference voltage is greater than the first reference voltage. The reference voltage gradually changes from the first reference voltage to the second reference voltage. The first reference voltage is located between the first reference voltage and the second reference voltage, such that the reference voltage is less than the first reference voltage in a first time period and greater than the first reference voltage in a second time period. The first time period and the second time period do not overlap.

[0043] The motor drive circuit 400 is used to connect to the motor 500. The motor drive circuit 400 is also used to output a first drive signal to the motor 500 in response to a first level signal, causing the motor 500 to rotate in a first direction, and to output a second drive signal to the motor 500 in response to a second level signal, causing the motor 500 to rotate in a second direction. The first direction and the second direction are opposite directions. In one embodiment, the first direction is forward rotation and the second direction is reverse rotation; of course, the first direction can also be reverse rotation and the second direction forward rotation.

[0044] The determination of the first and second time periods is related to the first reference voltage, the second reference voltage, and the first reference voltage. Specifically, a larger difference between the first and second reference voltages results in a longer total duration for both time periods; a larger difference between the first reference voltage and the first reference voltage results in a longer first time period; and a larger difference between the first reference voltage and the second reference voltage results in a longer second time period. Conversely, a smaller difference between the first and second reference voltages results in a shorter total duration for both time periods; a smaller difference between the first reference voltage and the first reference voltage results in a shorter first time period; and a smaller difference between the first reference voltage and the second reference voltage results in a shorter second time period. Therefore, the duration of the forward and reverse rotation of motor 500 is related to the first reference voltage, the second reference voltage, and the first reference voltage. Those skilled in the art can determine the first reference voltage, the second reference voltage, and the first reference voltage based on actual conditions; no further limitations are imposed here.

[0045] In one embodiment, the first reference voltage is 0V, the second reference voltage is 5V, and the first reference voltage is 2V. That is, during the first time period when the first reference voltage changes from 0V to 2V, the first comparator circuit 300 outputs a first-level signal to the motor drive circuit 400, causing the motor drive circuit 400 to output a first drive signal to the motor 500, thereby driving the motor 500 to rotate in the first direction. During the second time period when the first reference voltage changes from 2V to 5V, the first comparator circuit 300 outputs a second-level signal to the motor drive circuit 400, causing the motor drive circuit 400 to output a second drive signal to the motor 500, causing the motor 500 to rotate in the second direction, thereby achieving forward and reverse rotation control of the motor 500.

[0046] When the motor 500 rotates in both directions, a reference voltage is provided by the reference voltage providing circuit 100. The reference voltage gradually changes from a first reference voltage to a second reference voltage. A first reference voltage is provided by the first reference voltage providing circuit 200. In the first time period, the reference voltage is less than the first reference voltage. At this time, the first comparator circuit 300 outputs a first level signal to the motor drive circuit 400 to drive the motor 500 to rotate in the first direction. In the second time period, the reference voltage is greater than the first reference voltage. At this time, the first comparator circuit 300 outputs a second level signal to the motor drive circuit 400 to drive the motor 500 to rotate in the second direction. No microcontroller is required, which reduces costs. Furthermore, no software programming is required, simplifying the process during mass production.

[0047] In some embodiments, such as Figure 3 and Figure 5 As shown, the first comparator circuit 300 may include a first comparator sub-circuit 301 and a second comparator sub-circuit 302.

[0048] The first comparator sub-circuit 301 may include a first input terminal, a second input terminal, and a first output terminal. The reference voltage output terminal is connected to the first input terminal, the first reference voltage output terminal is connected to the second input terminal, and the first output terminal is connected to the motor drive circuit 400. The first comparator sub-circuit 301 is used to receive the reference voltage and the first reference voltage, and output a first level signal when the reference voltage is less than the first reference voltage.

[0049] The second comparator sub-circuit 302 includes a third input terminal, a fourth input terminal, and a second output terminal. The reference voltage output terminal is connected to the third input terminal, the first reference voltage output terminal is connected to the fourth input terminal, and the second output terminal is connected to the motor drive circuit 400. The second comparator sub-circuit 302 is used to receive the reference voltage and the first reference voltage, and outputs a second level signal when the reference voltage is greater than the first reference voltage.

[0050] like Figure 3 As shown, the first sub-comparator circuit may include a second resistor R2, a third resistor R3, a fourth resistor R4, and a first comparator U1; the end of the second resistor R2 that is not connected to the first comparator U1 is the first input terminal, the inverting input terminal of the first comparator U1 is the second input terminal, and the end of the fourth resistor R4 that is not connected to the first comparator U1 is the first output terminal.

[0051] like Figure 3 As shown, the second comparator sub-circuit 302 may include a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a second comparator U2; the end of the fifth resistor R5 that is not connected to the second comparator U2 is the third input terminal, the inverting input terminal of the second comparator U2 is the fourth input terminal, and the end of the seventh resistor R7 that is not connected to the second comparator U2 is the second output terminal.

[0052] In a specific application, a reference voltage is connected to the non-inverting input of the first comparator U1 through one end of the second resistor R2, and a first reference voltage is connected to the inverting input of the first comparator U1. A reference voltage is connected to the inverting input of the second comparator U2 through one end of the fifth resistor R5, and a first reference voltage is connected to the non-inverting input of the second comparator U2.

[0053] In one embodiment, the first reference voltage is 0V, the second reference voltage is 5V, and the first reference voltage is 2V. When the first reference voltage changes from 0V to 2V, the voltage at the non-inverting input of the first comparator U1 is lower than the voltage at its inverting input, and it outputs a low-level signal to the motor drive circuit 400. Simultaneously, the voltage at the non-inverting input of the second comparator U2 is higher than the voltage at its inverting input, and it outputs a high-level signal to the motor drive circuit 400. At this time, the motor drive circuit 400 outputs a first drive signal to the motor 500, causing the motor 500 to rotate in the forward direction. When the first reference voltage changes to a value greater than 2V, the voltage at the non-inverting input of the first comparator U1 is higher than the voltage at its inverting input, and it outputs a high-level signal to the motor drive circuit 400. Simultaneously, the voltage at the non-inverting input of the second comparator U2 is lower than the voltage at its inverting input, and it outputs a low-level signal to the motor drive circuit 400. At this time, the motor drive circuit 400 outputs a second drive signal to the motor 500, causing the motor 500 to rotate in the reverse direction.

[0054] It should be noted that, in this embodiment, when the motor drive circuit 400 drives the motor 500, the effective level signals are the high-level signal output by the first comparator U1 and the high-level signal output by the second comparator U2. That is, when the motor drive circuit 400 receives the high-level signal output by the first comparator U1, the motor 500 is driven to rotate in the reverse direction, and when the motor drive circuit 400 receives the high-level signal output by the second comparator U2, the motor 500 is driven to rotate in the forward direction. In other words, both the first level signal and the second level signal are high-level signals.

[0055] Of course, when the motor 500 is driven by the motor drive circuit 400, the active level signals can all be low level signals, that is, the first level signal and the second level signal are both low level signals.

[0056] In some embodiments, such as Figure 3 As shown, the reference voltage providing circuit 100 may include a first resistor R1, a charging / discharging capacitor C1, and a diode D1. One end of the first resistor R1 is connected to a power supply 700, and the other end of the first resistor R1 is connected to one end of the charging / discharging capacitor C1, with the other end of the charging / discharging capacitor C1 grounded. The anode of the diode D1 is connected to one end of the charging / discharging capacitor C1, and the cathode of the diode D1 is used to connect to the power supply 700. The connection point between the charging / discharging capacitor C1 and the first resistor R1 is the reference voltage output terminal. When the charging / discharging capacitor C1 is gradually charging, the reference voltage output at the reference voltage output terminal gradually changes from a first reference voltage to a second reference voltage.

[0057] In one embodiment, the power supply 700 can be a DC power supply 700 capable of outputting 5V. The DC power supply 700 charges the charging and discharging capacitor C1 through the first resistor R1. As the charging process progresses, the reference voltage output by the reference voltage output terminal of the reference voltage providing circuit 100 gradually changes from 0V. When the charging and discharging capacitor C1 is fully charged, the reference voltage output by the reference voltage output terminal rises to 5V.

[0058] After the control motor 500 completes its forward and reverse rotation, the on-site personnel can turn off the power supply to power supply 700. At this time, the charging and discharging capacitor C1 begins to discharge, discharging through diode D1. The reference voltage output from the reference voltage output terminal gradually changes from 5V to 0V.

[0059] In some embodiments, such as Figure 3 As shown, the first reference voltage providing circuit 200 may include a first voltage divider circuit 201. The voltage input terminal of the first voltage divider circuit 201 is used to connect to the power supply 700, and the voltage output terminal of the first voltage divider circuit 201 is the first reference voltage output terminal.

[0060] In one embodiment, such as Figure 3 As shown, the first voltage divider circuit 201 may include a thirteenth resistor R13 and a fourteenth resistor R14. Both the thirteenth resistor R13 and the fourteenth resistor R14 are voltage divider resistors. The connection terminal of the thirteenth resistor R13 and the fourteenth resistor R14 outputs a 2V DC power to the inverting input terminal of the first comparator U1.

[0061] In some embodiments, the motor forward and reverse rotation drive circuit may include a power supply 700 access circuit 600, which is connected to the motor drive circuit 400. The power supply 700 access circuit 600 is used to connect to the power supply 700 so that the power supply 700 can supply power to the motor drive circuit 400.

[0062] In some embodiments, such as Figure 2 As shown, the power supply 700 access circuit 600 may include a switching circuit 603, a second reference voltage supply circuit 601, and a second comparator circuit 602.

[0063] The switching circuit 603 includes a first terminal, a second terminal, and a control terminal. The first terminal is connected to the power supply 700, and the second terminal is connected to the motor drive circuit 400. The second reference voltage providing circuit 601 has a second reference voltage output terminal, which outputs a second reference voltage that is greater than the first reference voltage. The second comparator circuit 602 includes a fifth input terminal, a sixth input terminal, and a third output terminal. The reference voltage output terminal is connected to the fifth input terminal, the second reference voltage output terminal is connected to the sixth input terminal, and the third output terminal is connected to the control terminal of the switching circuit 603. The second comparator circuit 602 is used to connect the reference voltage and the second reference voltage. The second reference voltage is located between the first and second reference voltages, and when the reference voltage is less than the second reference voltage, it outputs a third-level signal to the control terminal of the switching circuit 603. When the conduction signal of the control terminal of the switching circuit 603 is the third-level signal, the first and second terminals are in a conducting state.

[0064] In one embodiment, such as Figure 4 As shown, the second comparator circuit 602 may include a third comparator U3 and a tenth resistor R10. The unconnected end of the tenth resistor R10 and the non-inverting input of the third comparator U3 is the fifth input of the second comparator circuit 602, used to connect a reference voltage. The inverting input of the third comparator U3 is the sixth input of the second comparator circuit 602, used to connect the second reference voltage output from the second reference voltage output terminal. The output of the third comparator U3 is the second output of the second comparator circuit 602, used to output a third-level signal.

[0065] In this embodiment, a reference voltage is connected to the non-inverting input of the third comparator U3 via the tenth resistor R10, and the inverting input of the third comparator U3 is connected to the second reference voltage output from the second reference voltage output terminal. When the reference voltage is less than the second reference voltage, the second comparator circuit 602 outputs a third-level signal to the control terminal of the switching circuit 603, causing the first and second terminals of the switching circuit 603 to conduct, and the supply voltage output by the power supply 700 is output to the motor drive circuit 400 through the first and second terminals.

[0066] As can be seen from the above discussion, since the second reference voltage is greater than the first reference voltage, the motor 500 can be powered normally during forward and reverse rotation by connecting the power supply 700 to the circuit 600.

[0067] In some embodiments, such as Figure 4As shown, the switching circuit 603 may include an eleventh resistor R11, a twelfth resistor R12, and a transistor Q1, which is a PNP transistor. In one embodiment, the third level signal is a low-level signal. That is, after a low-level signal is applied to the unconnected end of the eleventh resistor R11 and transistor Q1, transistor Q1 is turned on, and the supply voltage from the power supply 700 is output to the motor drive circuit 400. The emitter of transistor Q1 is the first terminal of the switching circuit 603, the collector of transistor Q1 is the second terminal of the switching circuit 603, and the base of transistor Q1 is the control terminal of the switching circuit 603.

[0068] In some embodiments, such as Figure 4 As shown, the motor drive circuit 400 is a motor drive circuit built with a driver chip U4. The model of the driver chip U4 can be, but is not limited to, LK6208. In specific connection, pin 1 of the driver chip U4 is connected to the second terminal of the switch circuit 603, pin 8 of the driver chip U4 is connected to the unconnected end of the seventh resistor R7 and the output terminal of the second comparator U2, and pin 5 of the driver chip U4 is connected to the unconnected end of the fourth resistor R4 and the output terminal of the first comparator U1.

[0069] In some embodiments, the second reference voltage is less than the second reference voltage. Since the second reference voltage is greater than the second reference voltage, when the reference voltage gradually changes from the first reference voltage to the second reference voltage, a situation will inevitably arise where the reference voltage is greater than or equal to the second reference voltage. When the reference voltage is greater than or equal to the second reference voltage, the second comparator circuit 602 outputs a fourth-level signal to the control terminal of the switching circuit 603, causing the first and second terminals of the switching circuit 603 to disconnect, the motor drive circuit 400 to lose power, and the motor 500 to stop. The third and fourth-level signals are different level signals. Because the motor drive circuit 400 automatically loses power when the reference voltage is greater than or equal to the second reference voltage, no manual power-off is required, and energy is saved.

[0070] In some embodiments, such as Figure 4 As shown, the second reference voltage supply circuit may include a second voltage divider circuit 6011. The voltage input terminal of the second voltage divider circuit 6011 is connected to the power supply 700, and the voltage output terminal of the second voltage divider circuit 6011 is the second reference voltage output terminal.

[0071] Specifically, such as Figure 4As shown, the second voltage divider circuit 6011 may include an eighth resistor R8 and a ninth resistor R9. Through the eighth resistor R8 and the ninth resistor R9, the 5V DC voltage is divided into a 4V DC voltage, which is then output to the inverting input of the third comparator U3. That is, when the reference voltage changes to 4V, the third comparator U3 outputs a high-level signal to the transistor Q1, causing transistor Q1 to disconnect, the motor drive circuit 400 to lose power, and the motor 500 to stop.

[0072] To better understand the forward and reverse drive circuit of the motor, the working process of the forward and reverse drive circuit of the motor will be explained again below. In the following explanation, the first comparator U1 and the third comparator U3 are powered by the 5V DC output of the power supply 700.

[0073] Specifically, when the power supply 700 outputs 5V DC, the connection between the eighth resistor R8 and the ninth resistor R9 outputs 4V DC to the inverting input of the third comparator U3, and the connection between the thirteenth resistor R13 and the fourteenth resistor R14 outputs 2V DC to the inverting input of the first comparator U1 and the non-inverting input of the second comparator U2. Simultaneously, the 5V DC begins charging the charging capacitor C1 through the first resistor R1. The reference voltage output from the reference voltage output terminal gradually rises from 0V. When it falls below 4V, the third comparator U3 outputs a low-level signal to the base of transistor Q1, and the collector of transistor Q1... When the electrode and emitter are connected, the driver chip U4 is powered on. Simultaneously, when the voltage is less than 2V, the second comparator U2 outputs a high-level signal to pin 8 of the driver chip U4, and the drive signal is output to the motor 500, causing the motor 500 to start rotating forward. When the reference voltage rises to greater than 2V, the first comparator U1 outputs a high-level signal to pin 5 of the drive signal, and the drive signal is output to the motor 500, causing the motor 500 to start rotating in reverse. When the reference voltage rises to 4V, the third comparator U3 outputs a high-level signal to the base of transistor Q1, causing transistor Q1 to disconnect, the driver chip U4 to be powered off, and the motor 500 to stop rotating. Furthermore, after the power supply 700 is de-energized, the charging / discharging capacitor C1 discharges. After releasing all its energy, when the power supply 700 is powered on again, the charging / discharging capacitor C1 is in a charging state, and the reference voltage gradually rises from 0V.

[0074] In some embodiments, this application also provides a motor forward and reverse rotation drive system, including a printed circuit board on which the aforementioned motor forward and reverse rotation drive circuit is integrated. Specific embodiments of a motor forward and reverse rotation drive circuit are described below, and will not be elaborated further here.

[0075] In summary, this application provides a motor forward and reverse rotation drive circuit and system, which has the following beneficial effects:

[0076] When the motor 500 rotates in both directions, it is achieved through the reference voltage supply circuit 100, the first reference voltage supply circuit 200, the first comparator circuit 300, and the motor drive circuit 400. This eliminates the need for a microcontroller, reducing costs, and also eliminates the need for software programming, simplifying the process during mass production.

[0077] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A motor forward and reverse rotation drive circuit, characterized in that, include: A reference voltage providing circuit, wherein the reference voltage providing circuit has a reference voltage output terminal, the reference voltage output terminal being used to output a reference voltage; A first reference voltage providing circuit, the first reference voltage providing circuit having a first reference voltage output terminal, the first reference voltage output terminal being used to output a first reference voltage; A first comparator circuit is connected to the reference voltage output terminal and the first reference voltage output terminal, respectively. The first comparator circuit receives the reference voltage and the first reference voltage, and outputs a first level signal when the reference voltage is less than the first reference voltage, and outputs a second level signal when the reference voltage is greater than the first reference voltage. The reference voltage gradually changes from the first reference voltage to the second reference voltage, and the first reference voltage is located between the first reference voltage and the second reference voltage, such that the reference voltage is less than the first reference voltage in a first time period and greater than the first reference voltage in a second time period, and the first time period and the second time period do not overlap. The motor drive circuit includes a first comparator circuit connected to the motor drive circuit, which is used to connect to a motor. The motor drive circuit is also used to output a first drive signal to the motor in response to a first level signal to cause the motor to rotate in a first direction, and to output a second drive signal to the motor in response to a second level signal to cause the motor to rotate in a second direction, wherein the first direction and the second direction are opposite directions.

2. The motor forward and reverse rotation drive circuit as described in claim 1, characterized in that, The first comparator circuit includes: A first comparator sub-circuit, comprising a first input terminal, a second input terminal, and a first output terminal, wherein the reference voltage output terminal is connected to the first input terminal, and the first reference voltage output terminal is connected to the second input terminal, the first comparator sub-circuit being used to receive the reference voltage and the first reference voltage, and outputting a first level signal when the reference voltage is less than the first reference voltage; The second comparator sub-circuit includes a third input terminal, a fourth input terminal, and a second output terminal. The reference voltage output terminal is connected to the third input terminal, and the first reference voltage output terminal is connected to the fourth input terminal. The second comparator sub-circuit is used to receive the reference voltage and the first reference voltage, and outputs a second level signal when the reference voltage is greater than the first reference voltage.

3. The motor forward and reverse rotation drive circuit as described in claim 2, characterized in that, Both the first level signal and the second level signal are either high level signals or low level signals. When the motor rotates in the first direction, it is rotating in the forward direction. When the motor rotates in the second direction, it is rotating in the reverse direction.

4. The motor forward and reverse rotation drive circuit as described in claim 1 or 2, characterized in that, The reference voltage providing circuit includes: a first resistor, a charging / discharging capacitor, and a diode D1; One end of the first resistor is connected to the power supply, the other end of the first resistor is connected to one end of the charging and discharging capacitor, the other end of the charging and discharging capacitor is grounded, the positive terminal of the diode D1 is connected to one end of the charging and discharging capacitor, and the negative terminal of the diode D1 is used to connect to the power supply. The connection point between the charging / discharging capacitor and the first resistor is the reference voltage output terminal; when the charging / discharging capacitor is in a charging state, it is gradually charged, and the reference voltage output by the reference voltage output terminal gradually changes from the first reference voltage to the second reference voltage.

5. The motor forward and reverse rotation drive circuit as described in claim 3, characterized in that, The first reference voltage providing circuit includes: a first voltage divider circuit, wherein the voltage input terminal of the first voltage divider circuit is used to connect to a power supply, and the voltage output terminal of the first voltage divider circuit is the first reference voltage output terminal.

6. The motor forward and reverse rotation drive circuit as described in claim 3, characterized in that, Also includes: A power supply access circuit is provided, which is connected to the motor drive circuit. The power supply access circuit is used to connect to a power supply so that the power supply can supply power to the motor drive circuit.

7. The motor forward and reverse rotation drive circuit as described in claim 6, characterized in that, The power supply circuit includes: A switching circuit, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal is used to connect to the power supply, and the second terminal is connected to the motor drive circuit; A second reference voltage providing circuit has a second reference voltage output terminal, which is used to output a second reference voltage, which is greater than the first reference voltage. The second comparator circuit includes a fifth input terminal, a sixth input terminal, and a third output terminal. The reference voltage output terminal is connected to the fifth input terminal, the second reference voltage output terminal is connected to the sixth input terminal, and the third output terminal is connected to the control terminal of the switching circuit. The second comparator circuit is used to connect the reference voltage and the second reference voltage. The second reference voltage is located between the first reference voltage and the second reference voltage. When the reference voltage is less than the second reference voltage, the second comparator circuit outputs a third level signal to the control terminal of the switching circuit. When the control terminal of the switching circuit is connected by the third level signal, the first terminal and the second terminal are in a conducting state.

8. The motor forward and reverse rotation drive circuit as described in claim 7, characterized in that, When the second reference voltage is less than the second reference voltage, and the reference voltage is greater than or equal to the second reference voltage, the second comparator circuit outputs a fourth level signal to the control terminal of the switching circuit. When the on signal of the control terminal of the switching circuit is the fourth level signal, the first terminal and the second terminal are in an off state.

9. The motor forward and reverse rotation drive circuit as described in claim 7 or 8, characterized in that, The second reference voltage supply circuit includes: a second voltage divider circuit, the voltage input terminal of the second voltage divider circuit being connected to the power supply, and the voltage output terminal of the second voltage divider circuit being the second reference voltage output terminal.

10. A motor forward and reverse rotation drive system, characterized in that, include: A printed circuit board, wherein the printed circuit board integrates a motor forward and reverse rotation drive circuit as described in any one of claims 1-9.

Images