Motor positive and negative rotation driving circuit and system

Abstract

The invention discloses a motor forward and reverse rotation driving circuit and system, and the circuit comprises a reference voltage supply circuit which is provided with a reference voltage output end; the first reference voltage providing circuit is provided with a first reference voltage output end; the reference voltage output end and the first reference voltage output end are respectively connected with the first comparator circuit; wherein the reference voltage is gradually changed 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, so that the reference voltage is smaller than the first reference voltage in a first time period and larger than the first reference voltage in a second time period, and the first time period and the second time period are not overlapped; and the first comparator circuit is connected with the motor driving circuit. When the motor rotates positively and negatively, a single chip microcomputer is not needed, the cost is reduced, software burning is not needed, and the process is simple during mass production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor control, and in particular to a motor forward and reverse rotation driving circuit and system. BACKGROUND

[0002] The motor is an indispensable component in product automation or mechanical structure. At present, the running mode of the motor is often realized by a single-chip microcomputer to control a driving chip to realize the forward and reverse rotation of the motor. Taking an ion fan as an example, the ion fan needs to perform dust removal on the high-voltage discharge needle of the ion fan when starting. After dust removal, the ion fan works.

[0003] In the related art, the ion fan needs to control the forward and reverse rotation of the motor to achieve the effect of double-sided dust removal of the high-voltage discharge needle. The forward and reverse rotation of the motor is realized by a single-chip microcomputer to control a driving chip to realize the forward and reverse rotation of the motor. When mass production, a software burning process needs to be added, which leads to complex process and high cost. SUMMARY

[0004] The technical problem solved by the present application is that the way of realizing the forward and reverse rotation of the motor by a single-chip microcomputer to control a driving chip leads to complex process and high cost.

[0005] According to a first aspect, an embodiment of the present application provides a motor forward and reverse rotation driving circuit, comprising:

[0006] A reference voltage providing circuit, the reference voltage providing circuit has a reference voltage output end, and the reference voltage output end is used to output a reference voltage;

[0007] A first reference voltage providing circuit, the first reference voltage providing circuit has a first reference voltage output end, and the first reference voltage output end is used to output a first reference voltage;

[0008] A first comparator circuit, the reference voltage output end and the first reference voltage output end are connected to the first comparator circuit respectively, the first comparator circuit 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, and output a second level signal when the reference voltage is greater than the first reference voltage; 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, so 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 driving circuit is connected with the first comparator circuit, and the motor driving circuit is used for connecting a motor, and the motor driving circuit is further used for outputting a first driving signal to the motor in response to the first level signal to make the motor rotate in a first direction, and outputting a second driving signal to the motor in response to the second level signal to make the motor rotate in a second direction, wherein the first direction and the second direction are opposite directions.

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

[0011] The first comparator sub-circuit comprises a first input end, a second input end and a first output end, the reference voltage output end is connected with the first input end, the first reference voltage output end is connected with the second input end, and the first comparator sub-circuit is used for receiving 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 comprises a third input end, a fourth input end and a second output end, the reference voltage output end is connected with the third input end, the first reference voltage output end is connected with the fourth input end, and the second comparator sub-circuit is used for receiving the reference voltage and the first reference voltage and outputting a second level signal when the reference voltage is greater than the first reference voltage.

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

[0014] In one embodiment, the reference voltage providing circuit comprises a first resistor, a charge-discharge capacitor and a diode D1.

[0015] One end of the first resistor is connected with a power supply, the other end of the first resistor is connected with one end of the charge-discharge capacitor, the other end of the charge-discharge capacitor is grounded, the positive electrode of the diode D1 is connected with one end of the charge-discharge capacitor, and the negative electrode of the diode D1 is used for connecting a power supply.

[0016] The connection node between the charge-discharge capacitor and the first resistor is the reference voltage output end; when the state of the charge-discharge capacitor is a charging state, the charge-discharge capacitor is gradually charged, and the reference voltage output by the reference voltage output end gradually changes from the first reference voltage to the second reference voltage.

[0017] In one embodiment, the first reference voltage providing circuit comprises a first voltage dividing circuit, a voltage input terminal of the first voltage dividing circuit is connected to the power supply, and a voltage output terminal of the first voltage dividing circuit is the first reference voltage output terminal.

[0018] In one embodiment, the motor driving circuit further comprises a power supply access circuit, the power supply access circuit is connected to the motor driving circuit, and the power supply access circuit is connected to the power supply to access the power supply to supply power to the motor driving circuit.

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

[0020] a switch circuit, the switch circuit comprises a first terminal, a second terminal and a control terminal, the first terminal is connected to the power supply, and the second terminal is connected to the motor driving circuit;

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

[0022] a second comparator circuit, the second comparator circuit comprises 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 switch circuit, the second comparator circuit is used to access the reference voltage and the second reference voltage, the second reference voltage is between the first reference voltage and the second reference voltage, and a third level signal is output to the control terminal of the switch circuit when the reference voltage is less than the second reference voltage;

[0023] wherein, when the control terminal of the switch circuit has a conduction signal of the third level signal, the first terminal and the second terminal are in a conduction state.

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

[0025] In one embodiment, the second reference voltage providing circuit comprises a second voltage dividing circuit, a voltage input terminal of the second voltage dividing circuit is connected to the power supply, and a voltage output terminal of the second voltage dividing circuit is the second reference voltage output terminal, 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 switch circuit, and the first terminal and the second terminal are in a disconnected state when the control terminal of the switch circuit has a conduction signal of the fourth level signal.

[0026] According to a second aspect, the application provides a motor forward and reverse rotation driving system, comprising: a printed circuit board, wherein the printed circuit board is integrated with the motor forward and reverse rotation driving circuit as described above.

[0027] The motor forward and reverse rotation driving circuit and system according to the above embodiment, when realizing motor forward and reverse rotation, a reference voltage is provided by the 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 the first reference voltage providing circuit, wherein the reference voltage is less than the first reference voltage in a first time period, at this time, the first comparator circuit outputs a first level signal to the motor driving circuit to drive the motor to rotate in a first direction; the reference voltage is greater than the first reference voltage in a second time period, at this time, the first comparator circuit outputs a second level signal to the motor driving circuit to drive the motor to rotate in a second direction, without the need for a single-chip microcomputer, the cost is reduced, and without the need for burning software, the process is simple during mass production. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A principle block diagram of the prior art for driving a motor by a single-chip microcomputer;

[0029] Figure 2 A principle block diagram of the motor forward and reverse rotation driving circuit of an embodiment;

[0030] Figure 3 A connection circuit diagram of the reference voltage providing circuit and the first reference voltage providing circuit in an embodiment;

[0031] Figure 4 A connection circuit diagram of the power supply access circuit and the motor driving circuit in an embodiment;

[0032] Figure 5 A control principle block diagram of the motor forward and reverse rotation driving circuit in an embodiment.

[0033] Reference signs: 100, reference voltage providing circuit; 200, first reference voltage providing circuit; 201, first voltage dividing circuit; 300, first comparator circuit; 301, first comparator sub-circuit; 302, second comparator sub-circuit; 400, motor driving circuit; 500, motor; 600, power supply access circuit; 601, second reference voltage providing circuit; 6011, second voltage dividing circuit; 602, second comparator circuit; 603, switching circuit; 700, power supply. DETAILED DESCRIPTION

[0034] The application will be described in further detail below with specific reference being made to the drawings. Like elements in different embodiments are denoted by like reference numerals. In the following description, numerous specific details are described to provide a thorough understanding of the application. However, it will be apparent to one skilled in the art that the application can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to unnecessarily obscure the application. In the following description, numerous specific details are described to provide a thorough understanding of the application. However, it will be apparent to one skilled in the art that the application can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to unnecessarily obscure the application.

[0035] In addition, features, operations or steps described in the specification can be combined in any suitable manner in various embodiments. Also, the various steps or actions in a method can be rearranged or reordered in other embodiments. Accordingly, the specification and drawings are to be regarded in an illustrative, rather than a restrictive, sense.

[0036] The serial numbers of components in the specification, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. The application said "connection", "coupling", unless otherwise specified, includes direct and indirect connection (coupling).

[0037] The high-voltage discharge needle of the ion fan needs to be cleaned on both sides before application by forward rotation and reverse rotation of the ion fan. In actual application, one forward rotation and one reverse rotation of the motor can clean both sides of the high-voltage discharge needle of the ion fan. As shown in Figure 1 When the current ion fan is cleaned on both sides, the single-chip microcomputer controls the motor drive circuit to realize the forward and reverse rotation of the motor, thereby realizing the cleaning of both sides of the high-voltage discharge needle. Although the single-chip microcomputer control motor drive circuit can realize the cleaning of both sides of the high-voltage discharge needle, the cost is high, and the software burning process needs to be added during mass production, resulting in complex process.

[0038] To solve the above problems, that is, when the single-chip microcomputer control drive chip is used to realize the cleaning of both sides of the high-voltage discharge needle, the cost is high, and the software burning process needs to be added during mass production, resulting in complex process, the application provides a motor forward and reverse rotation drive circuit, which realizes the forward and reverse rotation of the motor by a reference voltage providing circuit, a first reference voltage providing circuit, a first comparator circuit and a motor drive circuit, without a single-chip microcomputer, the cost is reduced, and the software burning process is not needed, the process is simple during mass production.

[0039] The motor forward and reverse rotation driving circuit disclosed in the present application is described below.

[0040] As shown in some embodiments, Figure 2 The motor forward and reverse rotation driving circuit can include a reference voltage providing circuit 100, a first reference voltage providing circuit 200, a first comparator circuit 300 and a motor driving circuit 400.

[0041] The reference voltage providing circuit 100 has a reference voltage output end for outputting a reference voltage. The first reference voltage providing circuit 200 has a first reference voltage output end for outputting a first reference voltage. The reference voltage output end and the first reference voltage output end are respectively connected to the first comparator circuit 300.

[0042] The first comparator circuit 300 is connected to the motor driving circuit 400, and 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, and output a second level signal when the reference voltage is greater than the first reference voltage; wherein the reference voltage gradually changes from a first reference voltage to a second reference voltage, and the first reference voltage is between the first reference voltage and the second reference voltage, so 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.

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

[0044] In determining the first time period and the second time period, the first reference voltage, the second reference voltage and the first reference voltage are related, that is, when the difference between the first reference voltage and the second reference voltage is large, the total length of the first time period and the second time period is long, when the difference between the first reference voltage and the first reference voltage is large, the length of the first time period is long, when the difference between the first reference voltage and the second reference voltage is large, the length of the second time period is long, and vice versa, when the difference between the first reference voltage and the second reference voltage is small, the total length of the first time period and the second time period is short, when the difference between the first reference voltage and the first reference voltage is small, the length of the first time period is short, when the difference between the first reference voltage and the second reference voltage is small, the length of the second time period is short. As can be seen, the length of the motor 500 rotation and the length of the reverse rotation are related to the first reference voltage, the second reference voltage and the first reference voltage. The first reference voltage, the second reference voltage and the first reference voltage can be determined by the person skilled in the art according to the actual situation, and will not be limited here.

[0045] In an embodiment, the first reference voltage is 0V, the second reference voltage is 5V, and the first reference voltage is 2V. That is, the first time period is in the process of changing the first reference voltage from 0V to 2V, at this time, the first comparator circuit 300 outputs the first level signal to the motor drive circuit 400, so that the motor drive circuit 400 outputs the first drive signal to the motor 500, thereby driving the motor 500 to rotate in the first direction. In the process of changing the first reference voltage from 2V to 5V, the second time period, at this time, the first comparator circuit 300 outputs the second level signal to the motor drive circuit 400, so that the motor drive circuit 400 outputs the second drive signal to the motor 500, so that the motor 500 rotates in the second direction, thereby realizing the forward and reverse rotation control of the motor 500.

[0046] In realizing the forward and reverse rotation of the motor 500, a reference voltage is provided by the reference voltage providing circuit 100, the reference voltage gradually changes from the first reference voltage to the second reference voltage, and a first reference voltage is provided by the first reference voltage providing circuit 200, wherein the reference voltage is less than the first reference voltage in the first time period, at this time the first comparator circuit 300 outputs the first level signal to the motor drive circuit 400 to drive the motor 500 to rotate in the first direction; the reference voltage is greater than the first reference voltage in the second time period, at this time the first comparator circuit 300 outputs the second level signal to the motor drive circuit 400 to drive the motor 500 to rotate in the second direction, without the need for a single-chip microcomputer, the cost is reduced, and without the need for burning software, the process is simple in mass production.

[0047] In some embodiments, as shown in Figure 3 and Figure 5 The first comparator circuit 300 can include a first comparator sub-circuit 301 and a second comparator sub-circuit 302.

[0048] The first comparator sub-circuit 301 can include a first input end, a second input end and a first output end, the reference voltage output end is connected to the first input end, the first reference voltage output end is connected to the second input end, and the first output end is connected to the motor driving 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 end, a fourth input end and a second output end, the reference voltage output end is connected to the third input end, the first reference voltage output end is connected to the fourth input end, and the second output end is connected to the motor driving circuit 400. The second comparator sub-circuit 302 is used to receive the reference voltage and the first reference voltage, and output a second level signal when the reference voltage is greater than the first reference voltage.

[0050] As shown in Figure 3 , the first sub-comparator circuit can include a second resistor R2, a third resistor R3, a fourth resistor R4 and a first comparator U1; the second resistor R2 and the first input end of the unconnected end of the first comparator U1, the inverting input end of the first comparator U1 is the second input end, and the fourth resistor R4 and the first output end of the unconnected end of the first comparator U1.

[0051] As shown in Figure 3 , the second comparator sub-circuit 302 can include a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a second comparator U2; the fifth resistor R5 and the third input end of the unconnected end of the second comparator U2, the inverting input end of the second comparator U2 is the fourth input end, and the seventh resistor R7 and the second output end of the unconnected end of the second comparator U2.

[0052] In specific applications, the reference voltage is connected to the non-inverting input end of the first comparator U1 through one end of the second resistor R2, the first reference voltage is connected to the inverting input end of the first comparator U1, the reference voltage is connected to the inverting input end of the second comparator U2 through one end of the fifth resistor R5, and the first reference voltage is connected to the non-inverting input end 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 an embodiment, the power supply 700 can be a direct current power supply 700 capable of outputting 5V. The direct current power supply 700 charges the charge-discharge capacitor C1 through the first resistor R1. As the charging process proceeds, the reference voltage output by the reference voltage output terminal of the reference voltage providing circuit 100 gradually changes from 0V. When the charge-discharge capacitor C1 is fully charged, the reference voltage output by the reference voltage output terminal rises to 5V.

[0058] After the control of the forward rotation and the reverse rotation of the motor 500 is completed, the on-site personnel can turn off the power supply, causing the power supply 700 to be powered off. At this time, the charge-discharge capacitor C1 starts to discharge through the diode D1. The reference voltage output by the reference voltage output terminal gradually changes from 5V to 0V.

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

[0060] In an embodiment, as shown in Figure 3 The first voltage dividing circuit 201 can include a thirteenth resistor R13 and a fourteenth resistor R14. Both the thirteenth resistor R13 and the fourteenth resistor R14 are voltage dividing resistors. The connection end of the thirteenth resistor R13 and the fourteenth resistor R14 outputs 2V direct current to the inverting input terminal of the first comparator U1.

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

[0062] In some embodiments, as shown in Figure 2 The power supply 700 access circuit 600 can include a switching circuit 603, a second reference voltage providing 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 switch circuit 603 can include an eleventh resistor R11, a twelfth resistor R12 and a transistor Q1, which is a PNP type transistor. In an embodiment, the third level signal is a low level signal, that is, after the low level signal is connected to an end of the eleventh resistor R11 and the transistor Q1, the transistor Q1 is turned on, and the supply voltage output by the power supply 700 is output to the motor driving circuit 400. Wherein, the emitter of the transistor Q1 is the first end of the switch circuit 603, the collector of the transistor Q1 is the second end of the switch circuit 603, and the base of the transistor Q1 is the control end of the switch circuit 603.

[0068] As shown in some embodiments, Figure 4 As shown, the motor driving circuit 400 is a motor driving circuit 400 built with a driving chip U4, wherein the model of the driving chip U4 can be but is not limited to LK6208. In particular, the first pin of the driving chip U4 is connected to the second end of the switch circuit 603, the eighth pin of the driving chip U4 is connected to an end of the seventh resistor R7 and the output end of the second comparator U2, and the fifth pin of the driving chip U4 is connected to an end of the fourth resistor R4 and the output end 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, the reference voltage greater than or equal to the second reference voltage will inevitably occur, and when the reference voltage is greater than or equal to the second reference voltage, the second comparator circuit 602 outputs the fourth level signal to the control end of the switch circuit 603, so that the first end and the second end of the switch circuit 603 are disconnected, the motor driving circuit 400 is powered off, and the motor 500 is stopped; wherein the third level signal and the fourth level signal are different level signals. Since the motor driving circuit 400 automatically powers off when the reference voltage is greater than or equal to the second reference voltage, manual power-off is not required, and energy saving is achieved.

[0070] As shown in some embodiments, Figure 4 As shown, the second reference voltage providing circuit can include a second voltage dividing circuit 6011, and the voltage input end of the second voltage dividing circuit 6011 is connected to the power supply 700, and the voltage output end of the second voltage dividing circuit 6011 is the second reference voltage output end.

[0071] In particular, as shown in some embodiments, Figure 4As shown, the second voltage dividing circuit 6011 can include an eighth resistor R8 and a ninth resistor R9, and the eighth resistor R8 and the ninth resistor R9 divide the 5V DC voltage into a 4V DC voltage output to the inverting input terminal 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, so that the transistor Q1 is turned off, the motor driving circuit 400 is powered off, and the motor 500 is stopped.

[0072] In order to better understand the motor forward and reverse rotation driving circuit, the working process of the motor forward and reverse rotation driving circuit will be described again below. In the following description, the first comparator U1 and the third comparator U3 are powered by the power supply 700 outputting 5V DC.

[0073] Specifically, when the power supply 700 outputs 5V DC, the connection end of the eighth resistor R8 and the ninth resistor R9 outputs 4V DC to the inverting input terminal of the third comparator U3, the connection end of the thirteenth resistor R13 and the fourteenth resistor R14 outputs 2V DC to the inverting input terminal of the first comparator U1 and the non-inverting input terminal of the second comparator U2, at the same time, 5V DC starts to charge the charge-discharge capacitor C1 through the first resistor R1, and the reference voltage output by the reference voltage output terminal starts to gradually rise from 0V. When the reference voltage is less than 4V, the third comparator U3 outputs a low level signal to the base of the transistor Q1, the collector and the emitter of the transistor Q1 are turned on, the driving chip U4 is powered on, at the same time, when the reference voltage is less than 2V, the second comparator U2 outputs a high level signal to the eighth pin of the driving chip U4, the driving signal outputs a driving signal to the motor 500, and the motor 500 starts to rotate forward. When the reference voltage rises to more than 2V, the first comparator U1 outputs a high level signal to the fifth pin of the driving signal, the driving signal outputs a driving signal to the motor 500, and the motor 500 starts to rotate reversely. When the reference voltage rises to 4V, the third comparator U3 outputs a high level signal to the base of the transistor Q1, the transistor Q1 is turned off, the driving chip U4 is powered off, and the motor 500 stops rotating. Further, after the power supply 700 is powered off, the charge-discharge capacitor C1 is discharged, and after the electric energy is released, the charge-discharge capacitor C1 is in a charging state again when the power supply 700 is powered on next time, and the reference voltage starts to gradually rise from 0V.

[0074] In some embodiments, the application also provides a motor forward and reverse rotation driving system, which includes a printed circuit board, and the printed circuit board is integrated with the above-mentioned motor forward and reverse rotation driving circuit. Details are described in the specific embodiment of the motor forward and reverse rotation driving circuit, which will not be described again here.

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

[0076] When realizing the forward and reverse rotation of the motor 500, the reference voltage providing circuit 100, the first reference voltage providing circuit 200, the first comparator circuit 300 and the motor driving circuit 400 are realized, without the single-chip microcomputer, the cost is reduced, and without burning software, the process is simple in mass production.

[0077] The above application of specific examples to the present invention is described, just to help understand the invention, and not to limit the invention. For the skilled in the art to which the present invention belongs, according to the idea of the present invention, several simple deductions, deformation or replacement can be made.

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.

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