Direct current motor control circuit

Abstract

The utility model discloses a direct current motor control circuit, relates to the reverse connection prevention field, the direct current motor control circuit is provided with a control circuit, a main switch, a reverse connection prevention module and a drive circuit, the control circuit can control the main switch to be switched on after a power supply is normally powered on, and the reverse connection prevention module can also control the reverse connection prevention module to be switched off after the power supply is normally powered on. As the first terminal voltage is larger than the second terminal voltage, the driving circuit controls the motor to start normally on the premise that the main switch and the anti-reverse-connection module are conducted, otherwise, if the power supply is reversely connected and the main switch and the anti-reverse-connection module are both turned off, the driving circuit does not control the motor to start normally, and the motor cannot start normally. The direct current motor control circuit provided by the utility model has an anti-reverse connection function, and the safety of the direct current motor control circuit is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of reverse connection prevention, in particular to a direct current motor control circuit. Background Art

[0002] In the motor control circuit, once the positive terminal of the motor control circuit is connected to the negative terminal of the power supply, and the negative terminal of the motor control circuit is connected to the positive terminal of the power supply, the positive and negative poles of the circuit will be reversed. In this case, the motor control circuit is very dangerous and often accompanied by risks such as heating, fire, and explosion. Especially for the repair of after-sales motor control circuits, if the motor control circuit does not have a reverse connection protection function, once the power supply is reversely connected to the motor control circuit, it will bring very great risks. Therefore, how to design a motor control circuit with a reverse connection protection function is an urgent problem to be solved. Utility Model Content

[0003] The purpose of the utility model is to provide a DC motor control circuit. The DC motor control circuit provided by the present application has an anti-reverse connection function, which greatly improves the safety of the DC motor control circuit.

[0004] In order to solve the above technical problems, the utility model provides a DC motor control circuit, including: a control circuit, a main switch, an anti-reverse connection module and a drive circuit;

[0005] The input end of the control circuit is connected to the positive electrode of the power supply, and the output end is connected to the control end of the main switch, and is used to control the main switch to be turned on after the power supply is normally powered on;

[0006] A first end of the main switch is connected to the positive electrode of the power supply, and a second end of the main switch is connected to the positive input terminal of the drive circuit;

[0007] The first end of the anti-reverse connection module is connected to the first end of the main switch, and the second end is connected to the second end of the main switch, and is used to be turned on when the voltage of the first end of the anti-reverse connection module is greater than the voltage of the second end of the anti-reverse connection module, and turned off when the voltage of the first end of the anti-reverse connection module is not greater than the voltage of the second end of the anti-reverse connection module;

[0008] The negative input terminal of the driving circuit is connected to the negative electrode of the power supply, and the three output terminals are respectively connected to the power supply terminals of the motor, so as to control the voltage of the power supply to be output through the output terminals.

[0009] Optionally, the control circuit includes: a first diode, a first switch, a second switch, a linear voltage regulator chip and a DC-DC chip;

[0010] The anode of the first diode is connected to the positive electrode of the power supply, and the cathode is connected to the first end of the first switch and the first end of the second switch respectively;

[0011] The second end of the first switch is connected to the input end of the linear voltage regulator chip;

[0012] The output end of the linear voltage regulator chip is connected to the control end of the second switch, and is used to convert the voltage transmitted by the power supply into a first preset voltage after the first switch is turned on and the power supply is powered on normally, so as to control the second switch to be turned on;

[0013] The second end of the second switch is connected to the input end of the DC-DC chip;

[0014] The output end of the DC-DC chip is connected to the control end of the main switch, and is used to convert the first preset voltage into a second preset voltage after the second switch is turned on, so as to control the main switch to be turned on.

[0015] Optionally, the anti-reverse connection module is a second diode, an anode of the second diode is connected to the first end of the main switch, and a cathode of the second diode is connected to the second end of the main switch.

[0016] Optionally, the second switch is a transistor, the base of the transistor is the control end of the second switch, the collector of the transistor is the first end of the second switch, and the emitter of the transistor is the second end of the second switch.

[0017] Optionally, the main switch is a relay, the first end of the coil of the relay is the control end of the main switch, the second end of the coil of the relay is connected to the ground, the first contact of the relay is the first end of the main switch, and the second contact of the relay is the second end of the main switch, which is used to close the first contact and the second contact when the coil of the relay is energized.

[0018] Optionally, it also includes: a voltage acquisition device, a charging capacitor, a controller, and a third switch;

[0019] The positive electrode of the charging capacitor is connected to the second end of the anti-reverse connection module, and the negative electrode is connected to the ground, and is used for charging when the anti-reverse connection module is turned on and the power supply is powered on normally;

[0020] The collecting end of the voltage collecting device is respectively connected to the positive electrode of the charging capacitor and the negative electrode of the charging capacitor, and the output end is connected to the input end of the controller, so as to transmit the collected charging voltage value of the charging capacitor to the controller;

[0021] The output end of the controller is connected to the control end of the third switch, and is used to control the third switch to be turned on when the charging voltage value is greater than the charging voltage threshold;

[0022] The first end of the third switch is connected to the second end of the coil of the relay, and the second end of the third switch is connected to the ground.

[0023] Optionally, it also includes: a comparator chip, an OR gate, and a LOGDC chip;

[0024] The three input terminals of the comparator chip are respectively connected to the three output terminals of the drive circuit, and are used to collect the reverse electromotive force of the three output terminals of the drive circuit, and output a high level to the OR gate when the reverse electromotive force meets the preset conduction condition;

[0025] The input end of the OR gate is connected to the output end of the comparator chip;

[0026] The LOGDC chip, the input end of the LOGDC chip is connected to the output end of the OR gate, and the output end is connected to the control end of the drive circuit, and is used to output a corresponding drive signal to the drive circuit after receiving the high-level signal transmitted by the OR gate, so as to change the output end voltage of the drive circuit.

[0027] Optionally, the driving circuit includes three bridge arms, each of the bridge arms includes two MOS tubes connected in series, the gate of each MOS tube is connected to the output end of the LOGDC chip, the input positive end of each bridge arm is connected to the second end of the main switch, the output negative end is connected to the negative electrode of the power supply, and the common output end of the two MOS tubes on each bridge arm is correspondingly connected to the power supply end of the motor, so as to change the voltage of the common output end of each bridge arm based on the control of the driving signal output by the LOGDC chip.

[0028] Optionally, it further comprises: a third diode, a sound alarm device and / or a display alarm device;

[0029] The input end of the sound alarm device and / or the input end of the display alarm device is connected to the negative electrode of the power supply, and the output end of the sound alarm device and / or the output end of the display alarm device is connected to the anode of the third diode, so as to issue a corresponding sound alarm and / or display alarm when the power supply is reversely connected;

[0030] A cathode of the third diode is connected to the positive electrode of the power supply.

[0031] Optionally, also include:

[0032] A current limiting resistor, wherein a first end of the current limiting resistor is connected to the cathode of the third diode, and a second end of the current limiting resistor is connected to the positive electrode of the power supply.

[0033] The present embodiment provides a DC motor control circuit, in which a control circuit, a main switch, an anti-reverse connection module and a drive circuit are provided, wherein the control circuit controls the main switch to be turned on after the power supply is normally powered on, and the anti-reverse connection module is also turned on after the power supply is normally powered on because the voltage at its first end is greater than the voltage at its second end, and the drive circuit controls the motor to start normally under the premise that the main switch and the anti-reverse connection module are turned on, conversely, if the power supply is reversed, the main switch and the anti-reverse connection module are both turned off, and the drive circuit will not control the motor to start normally. The DC motor control circuit provided in the present application has an anti-reverse connection function, which greatly improves the safety of the DC motor control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a DC motor control circuit provided by the utility model;

[0036] Figure 2 The present invention is a schematic structural diagram of another DC motor control circuit provided by the utility model. DETAILED DESCRIPTION

[0037] The core of the utility model is to provide a DC motor control circuit. The DC motor control circuit provided by the present application has an anti-reverse connection function, which greatly improves the safety of the DC motor control circuit.

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Please refer to Figure 1 , Figure 1 The structure diagram of a DC motor control circuit provided by the utility model. The DC motor control circuit comprises: a control circuit 1, a main switch 2, an anti-reverse connection module 3 and a drive circuit 4;

[0040] The input end of the control circuit 1 is connected to the positive electrode of the power supply, and the output end is connected to the control end of the main switch 2, which is used to control the main switch 2 to be turned on after the power supply is normally powered on;

[0041] A first end of the main switch 2 is connected to the positive electrode of the power supply, and a second end of the main switch 2 is connected to the positive input terminal of the drive circuit 4;

[0042] The first end of the anti-reverse connection module 3 is connected to the first end of the main switch 2, and the second end is connected to the second end of the main switch 2, and is used to be turned on when the voltage of the first end of the anti-reverse connection module 3 is greater than the voltage of the second end of the anti-reverse connection module 3, and turned off when the voltage of the first end of the anti-reverse connection module 3 is not greater than the voltage of the second end of the anti-reverse connection module 3;

[0043] The negative input terminal of the driving circuit 4 is connected to the negative electrode of the power supply, and the three output terminals are respectively connected to the power supply terminals of the motor, and are used to control the voltage of the power supply to be output through the output terminals.

[0044] In the utility model, when the power supply is powered on normally, the control circuit 1 will control the main switch 2 to be turned on, and the anti-reverse connection module 3 will be turned on normally only when the power supply is powered on normally, that is, the voltage at the first end is greater than the voltage at the second end when the power supply is positively connected. Only when the main switch 2 and the anti-reverse connection module 3 are turned on, the positive pole of the power supply, the main switch 2 / the anti-reverse connection module 3, the drive circuit 4, and the negative pole of the power supply can form a complete circuit, and the motor can be powered on and started normally. On the contrary, if the power supply is reversed, the control circuit 1 will not control the main switch 2 to be turned on. At this time, the voltage at the first end of the anti-reverse connection module 3 is not greater than the voltage at the second end, so the main switch 2 and the anti-reverse connection module 3 are both turned off. At this time, the negative pole of the power supply, the drive circuit 4, the main switch 2 / the anti-reverse connection module 3, and the positive pole of the power supply cannot form a complete circuit, and the motor will not be powered on and work. The present application adopts this DC motor control circuit, which can ensure that the motor only works in an environment where the power supply is positively connected, thereby improving the safety of the motor operation.

[0045] The present embodiment provides a DC motor control circuit, in which a control circuit 1, a main switch 2, an anti-reverse connection module 3 and a drive circuit 4 are provided, wherein the control circuit 1 controls the main switch 2 to be turned on after the power supply is normally powered on, and the anti-reverse connection module 3 is also turned on after the power supply is normally powered on because the voltage at its first end is greater than the voltage at its second end, and the drive circuit 4 controls the motor to start normally under the premise that the main switch 2 and the anti-reverse connection module 3 are turned on, on the contrary, if the power supply is reversed, the main switch 2 and the anti-reverse connection module 3 are both turned off, and the drive circuit 4 will not control the motor to start normally. The DC motor control circuit provided in the present application has an anti-reverse connection function, which greatly improves the safety of the DC motor control circuit.

[0046] Based on the above embodiments:

[0047] As an optional embodiment, the control circuit 1 includes: a first diode D1, a first switch S1, a second switch S2, a linear voltage regulator chip and a DC-DC chip;

[0048] The anode of the first diode D1 is connected to the positive electrode of the power supply, and the cathode is connected to the first end of the first switch S1 and the first end of the second switch S2 respectively;

[0049] The second end of the first switch S1 is connected to the input end of the linear voltage regulator chip;

[0050] The output end of the linear voltage regulator chip is connected to the control end of the second switch S2, and is used to convert the voltage transmitted by the power supply into a first preset voltage after the first switch S1 is turned on and the power supply is powered on normally, so as to control the second switch S2 to be turned on;

[0051] A second end of the second switch S2 is connected to an input end of the DC-DC chip;

[0052] The output end of the DC-DC chip is connected to the control end of the main switch 2, and is used to convert the first preset voltage into the second preset voltage after the second switch S2 is turned on, so as to control the main switch 2 to be turned on.

[0053] In the utility model, the control circuit 1 includes a first diode D1, a first switch S1, a second switch S2, a linear voltage regulator chip and a DC-DC chip, wherein, when the power supply is normally powered on (positive connection), the first diode D1 is turned on, if the first switch S1 is turned on, the linear voltage regulator chip will work, and convert the voltage of the power supply into a first preset voltage, thereby controlling the second switch S2 to turn on, when the second switch S2 is turned on, the DC-DC chip will work, and convert the first preset voltage output by the linear voltage regulator chip into a second preset voltage, thereby controlling the main switch 2 to turn on, on the contrary, when the power supply is reversely connected, that is, the negative electrode of the power supply is connected to the ground terminal through the first diode D1 because both the DC-DC chip and the linear voltage regulator chip have a ground terminal, so when the first switch S1 is turned on, because the potential of the ground line is higher than the potential of the negative electrode of the power supply, the first diode D1 is not turned on, thereby ensuring that the main switch 2 will be turned on only when the power supply is normally powered on (positive connection), thereby ensuring the reliability of the solution.

[0054] It should be noted that in actual applications, the linear voltage regulator chip is an LDO (Low Dropout Regulator) chip, and the first preset voltage is generally 5V, and the second preset voltage is generally 12V. The present application does not specifically limit the specific values ​​of the first preset voltage and the second preset voltage. The specific values ​​of the first preset voltage and the second preset voltage depend on actual requirements.

[0055] As an optional embodiment, the reverse connection prevention module 3 is a second diode D2 , an anode of the second diode D2 is connected to the first end of the main switch 2 , and a cathode of the second diode D2 is connected to the second end of the main switch 2 .

[0056] In the utility model, the anti-reverse connection module 3 is a second diode D2. Since the second diode D2 will be turned on only when the voltage of its own anode is greater than the voltage of its own cathode, the second diode D2 has the function of anti-reverse connection, and when the power supply is reversed, the negative pole of the power supply, the drive circuit 4, the main switch 2 / the second diode D2, and the positive pole of the power supply cannot form a complete circuit. The second diode D2 has a small size, low cost and can accurately achieve the function of anti-reverse connection.

[0057] As an optional embodiment, the second switch S2 is a transistor, the base of the transistor is the control end of the second switch S2, the collector of the transistor is the first end of the second switch S2, and the emitter of the transistor is the second end of the second switch S2.

[0058] In the utility model, the second switch S2 is a triode. When the power supply is positively connected, the second diode D2 is turned on. If the first switch S1 is turned on, the linear voltage regulator chip will work and convert the voltage of the power supply into a first preset voltage, thereby controlling the triode to be turned on. When the triode is turned on, the DC-DC chip will work and convert the first preset voltage output by the linear voltage regulator chip into a second preset voltage, thereby controlling the main switch 2 to be turned on. Otherwise, the gate of the triode will not receive the first preset voltage output by the linear voltage regulator chip, thereby not turning on the main switch 2, thereby ensuring the accuracy of the solution.

[0059] As an optional embodiment, the main switch 2 is a relay, the first end of the coil of the relay is the control end of the main switch 2, the second end of the coil of the relay is connected to the ground, the first contact of the relay is the first end of the main switch 2, and the second contact of the relay is the second end of the main switch 2, which is used to close the first contact and the second contact when the coil of the relay is energized.

[0060] In the utility model, the main switch 2 is a relay. At this time, the coil of the relay is located at the output end of the control circuit 1. When the power supply is normally powered on, the control circuit 1 can output a corresponding voltage, so that the coil of the relay is energized, and the first contact and the second contact of the relay are closed, and the positive pole of the power supply, the relay / anti-reverse connection module 3, the drive circuit 4, and the negative pole of the power supply form a complete loop. On the contrary, if the power supply is reversed, the coil of the relay will not be energized, and the relay cannot be turned on. The relay has the advantages of fast action, stable operation, long service life, and small size.

[0061] As an optional embodiment, it further includes: a voltage collection device, a charging capacitor C, a controller, and a third switch S3;

[0062] The positive electrode of the charging capacitor C is connected to the second end of the anti-reverse connection module 3, and the negative electrode is connected to the ground, and is used for charging when the anti-reverse connection module 3 is turned on and the power supply is normally powered on;

[0063] The collecting end of the voltage collecting device is respectively connected to the positive electrode of the charging capacitor C and the negative electrode of the charging capacitor C, and the output end is connected to the input end of the controller, so as to transmit the collected charging voltage value of the charging capacitor C to the controller;

[0064] The output end of the controller is connected to the control end of the third switch S3, and is used to control the third switch S3 to be turned on when the charging voltage value is greater than the charging voltage threshold;

[0065] A first end of the third switch S3 is connected to the second end of the coil of the relay, and a second end of the third switch S3 is connected to the ground.

[0066] In the utility model, a voltage acquisition device, a charging capacitor C, a controller, and a third switch S3 are also provided in the DC motor control circuit, wherein, when the power supply is normally powered on, the anti-reverse connection module 3 is turned on, at this time, the positive pole of the power supply, the anti-reverse connection module 3, the charging capacitor C, and the ground wire form a complete loop, and the charging capacitor C is charged. At this time, the voltage acquisition device can collect the voltage across the charging capacitor C, that is, the charging voltage value of the capacitor, and transmit the collected charging voltage value to the controller. When the controller receives the charging voltage value, it determines that the power supply is normally powered on, and controls the third switch S3 to be turned on. Because the third switch S3 is located on the power supply circuit of the coil of the relay, when the third switch S3 is turned on, if the control circuit 1 outputs the second preset voltage when the power supply is powered on, the coil of the relay can be energized, and then the relay is controlled to be turned on, thereby ensuring the accuracy of the relay control.

[0067] It should be noted that, in practical applications, the third switch S3 may be a triode, or a MOS tube or other switch devices.

[0068] As an optional embodiment, it further includes: a comparator chip, an OR gate, and a LOGDC chip;

[0069] The three input terminals of the comparator chip are respectively connected to the three output terminals of the driving circuit 4, and are used to collect the reverse electromotive force of the three output terminals of the driving circuit 4, and output a high level to the OR gate when the reverse electromotive force meets the preset conduction condition;

[0070] The input of the OR gate is connected to the output of the comparator chip;

[0071] LOGDC chip, the input end of the LOGDC chip is connected to the output end of the OR gate, and the output end is connected to the control end of the drive circuit 4, which is used to output a corresponding drive signal to the drive circuit 4 after receiving the high level signal transmitted by the OR gate to change the output end voltage of the drive circuit 4.

[0072] In the utility model, a comparator chip, an OR gate, and a LOGDC chip are also provided in the DC motor control circuit, wherein the comparator chip can collect the reverse electromotive force of the three output terminals of the driving circuit 4, and output a high level to the OR gate when the reverse electromotive force meets the preset conduction condition. For example, the comparator chip can collect the reverse electromotive force of the preset two output terminals, and the sudden change of these two reverse electromotive forces meets the preset conditions, then the comparator chip will output a high-level signal, thereby causing the OR gate connected to the output terminal of the comparator chip to also output a high-level signal, and after receiving the high-level signal, the LOGDC chip will output a corresponding driving signal to the driving circuit 4, and then the output terminal voltage of the high-side driving circuit 4 can ensure the accuracy of controlling the driving circuit 4.

[0073] As an optional embodiment, the driving circuit 4 includes three bridge arms, each bridge arm includes two MOS tubes connected in series, the gate of each MOS tube is connected to the output end of the LOGDC chip, the input positive end of each bridge arm is connected to the second end of the main switch 2, and the output negative end is connected to the negative electrode of the power supply, and the common output end of the two MOS tubes on each bridge arm is correspondingly connected to the power supply end of the motor, so as to change the voltage of the common output end of each bridge arm based on the control of the driving signal output by the LOGDC chip.

[0074] In the utility model, the driving circuit 4 includes three bridge arms, each of which includes two MOS tubes (Metal-Oxide-Semiconductor) connected in series, that is, the driving circuit 4 includes six MOS tubes, and three MOS tubes are upper bridge MOS tubes, and the other three MOS tubes are lower bridge MOS tubes. Each MOS tube is turned on and off accordingly under the control of the driving signal output by the LOGDC chip, and it is necessary to ensure that when the three bridge arms supply power to the motor, only one of the upper bridge MOS tube and the lower bridge MOS tube in the three bridge arms is turned on, so that the motor can work normally when the power supply is normally powered on.

[0075] It should be noted that according to Figure 2It can be seen that the anode of the parasitic diode of each MOS tube is connected to the negative electrode of the power supply, and the cathode of the parasitic diode is connected to the second end of the main switch 2. Therefore, when the power supply is positively connected, each MOS tube is turned on and off by the control of the LOGDC chip, and outputs a corresponding voltage to enable the motor to be powered on and work. When the power supply is reversed, because the anti-reverse connection module 3 and the main switch 2 are both turned off, the negative electrode of the power supply, the drive circuit 4, the main switch 2 / the anti-reverse connection module 3, and the positive electrode of the power supply cannot form a loop, and the motor will not be powered on and work.

[0076] As an optional embodiment, it further includes: a third diode D3, a sound alarm device and / or a display alarm device;

[0077] The input end of the sound alarm device and / or the input end of the display alarm device is connected to the negative electrode of the power supply, and the output end of the sound alarm device and / or the output end of the display alarm device is connected to the anode of the third diode D3, so as to issue a corresponding sound alarm and / or display alarm when the power supply is reversely connected;

[0078] The cathode of the third diode D3 is connected to the positive electrode of the power supply.

[0079] In the utility model, a third diode D3, a sound alarm device and / or a display alarm device are also provided in the DC motor control circuit, wherein, when the power supply is reversely connected, the third diode D3 is turned on, at which time, the sound alarm device and / or the display alarm device can be powered, and then a corresponding sound alarm and / or display alarm is issued; conversely, if the power supply is normally powered on (positively connected), the third diode D3 is turned off, and the sound alarm device and / or the display alarm device cannot be powered, and then a corresponding sound alarm and / or display alarm cannot be issued, that is, the present solution can issue a corresponding sound alarm and / or display alarm when the power supply is reversely connected, timely reminding the user of the reverse power supply connection, and facilitating maintenance of the DC motor control circuit.

[0080] It should be noted that, in practical applications, the sound alarm device may be a buzzer or other sound alarm devices, wherein the buzzer also has the advantages of low cost and fast response. The display alarm device may be an LED (Light-Emitting Diode) or other display alarm devices such as an electric lamp, wherein the LED also has the advantages of high reliability, low power consumption, environmental protection, low cost, and small size.

[0081] As an optional embodiment, it also includes:

[0082] A current limiting resistor R, wherein a first end of the current limiting resistor R is connected to the cathode of the third diode D3, and a second end of the current limiting resistor R is connected to the positive electrode of the power supply.

[0083] In the utility model, a current limiting resistor R is also arranged in the DC motor control circuit, which can play a role of current limiting when the power supply is reversely connected, thereby improving the safety of the DC motor control circuit.

[0084] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0085] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC motor control circuit, characterized in that: include: Control circuit, main switch, anti-reverse connection module and drive circuit; The input end of the control circuit is connected to the positive electrode of the power supply, and the output end is connected to the control end of the main switch, and is used to control the main switch to be turned on after the power supply is normally powered on; A first end of the main switch is connected to the positive electrode of the power supply, and a second end of the main switch is connected to the positive input terminal of the drive circuit; The first end of the anti-reverse connection module is connected to the first end of the main switch, and the second end is connected to the second end of the main switch, and is used to be turned on when the voltage of the first end of the anti-reverse connection module is greater than the voltage of the second end of the anti-reverse connection module, and turned off when the voltage of the first end of the anti-reverse connection module is not greater than the voltage of the second end of the anti-reverse connection module; The negative input terminal of the driving circuit is connected to the negative electrode of the power supply, and the three output terminals are respectively connected to the power supply terminals of the motor, so as to control the voltage of the power supply to be output through the output terminals.

2. The DC motor control circuit according to claim 1, characterized in that: The control circuit includes: a first diode, a first switch, a second switch, a linear voltage regulator chip and a DC-DC chip; The anode of the first diode is connected to the positive electrode of the power supply, and the cathode is connected to the first end of the first switch and the first end of the second switch respectively; The second end of the first switch is connected to the input end of the linear voltage regulator chip; The output end of the linear voltage regulator chip is connected to the control end of the second switch, and is used to convert the voltage transmitted by the power supply into a first preset voltage after the first switch is turned on and the power supply is powered on normally, so as to control the second switch to be turned on; The second end of the second switch is connected to the input end of the DC-DC chip; The output end of the DC-DC chip is connected to the control end of the main switch, and is used to convert the first preset voltage into a second preset voltage after the second switch is turned on, so as to control the main switch to be turned on.

3. The DC motor control circuit according to claim 2, characterized in that: The anti-reverse connection module is a second diode, an anode of the second diode is connected to the first end of the main switch, and a cathode of the second diode is connected to the second end of the main switch.

4. The DC motor control circuit according to claim 2, characterized in that: The second switch is a transistor, the base of the transistor is the control end of the second switch, the collector of the transistor is the first end of the second switch, and the emitter of the transistor is the second end of the second switch.

5. The DC motor control circuit according to claim 1, characterized in that: The main switch is a relay, the first end of the coil of the relay is the control end of the main switch, the second end of the coil of the relay is connected to the ground, the first contact of the relay is the first end of the main switch, and the second contact of the relay is the second end of the main switch, which is used to close the first contact and the second contact when the coil of the relay is energized.

6. The DC motor control circuit according to claim 5, characterized in that: Also includes: Voltage acquisition device, charging capacitor, controller, and third switch; The positive electrode of the charging capacitor is connected to the second end of the anti-reverse connection module, and the negative electrode is connected to the ground, and is used for charging when the anti-reverse connection module is turned on and the power supply is powered on normally; The collecting end of the voltage collecting device is respectively connected to the positive electrode of the charging capacitor and the negative electrode of the charging capacitor, and the output end is connected to the input end of the controller, so as to transmit the collected charging voltage value of the charging capacitor to the controller; The output end of the controller is connected to the control end of the third switch, and is used to control the third switch to be turned on when the charging voltage value is greater than the charging voltage threshold; The first end of the third switch is connected to the second end of the coil of the relay, and the second end of the third switch is connected to the ground.

7. The DC motor control circuit according to claim 1, characterized in that: Also includes: comparator chip, OR gate, LOGDC chip; The three input terminals of the comparator chip are respectively connected to the three output terminals of the drive circuit, and are used to collect the reverse electromotive force of the three output terminals of the drive circuit, and output a high level to the OR gate when the reverse electromotive force meets the preset conduction condition; The input end of the OR gate is connected to the output end of the comparator chip; The LOGDC chip, the input end of the LOGDC chip is connected to the output end of the OR gate, and the output end is connected to the control end of the drive circuit, and is used to output a corresponding drive signal to the drive circuit after receiving the high-level signal transmitted by the OR gate, so as to change the output end voltage of the drive circuit.

8. The DC motor control circuit according to claim 7, characterized in that: The driving circuit includes three bridge arms, each of which includes two MOS tubes connected in series, the gate of each MOS tube is connected to the output end of the LOGDC chip, the input positive end of each bridge arm is connected to the second end of the main switch, and the output negative end is connected to the negative electrode of the power supply, and the common output end of the two MOS tubes on each bridge arm is correspondingly connected to the power supply end of the motor, so as to change the voltage of the common output end of each bridge arm based on the control of the driving signal output by the LOGDC chip.

9. The DC motor control circuit according to any one of claims 1 to 8, characterized in that: Also includes: a third diode, a sound alarm device and / or a display alarm device; The input end of the sound alarm device and / or the input end of the display alarm device is connected to the negative electrode of the power supply, and the output end of the sound alarm device and / or the output end of the display alarm device is connected to the anode of the third diode, so as to issue a corresponding sound alarm and / or display alarm when the power supply is reversely connected; A cathode of the third diode is connected to the positive electrode of the power supply.

10. The DC motor control circuit according to claim 9, characterized in that: Also includes: A current limiting resistor, wherein a first end of the current limiting resistor is connected to the cathode of the third diode, and a second end of the current limiting resistor is connected to the positive electrode of the power supply.

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