Driving circuit and driving device

Abstract

The utility model discloses a driving circuit and driving equipment, the driving circuit comprises a multi-phase power supply, a first protection module, a second protection module, a rectification module, a filtering module and an inversion module, the multi-phase power supply is connected with the input end of the rectification module, and the rectification module is also connected with the two ends of the filtering module; the two ends of the filtering module are connected with the input end and the output end of the inversion module respectively, the first protection module is connected between one end of the filtering module and a multi-phase power supply, the second protection module is connected between the other end of the filtering module and the multi-phase power supply, and the output end of the inversion module is used for being connected with a motor; under the condition that the driving circuit is short-circuited, the first protection module is used for disconnecting a loop between one end of the filtering module and the multi-phase power supply; and the second protection module is used for reducing current on a corresponding loop between the other end of the filtering module and the multi-phase power supply. Therefore, when the drive circuit is short-circuited, the situation that the current on the drive circuit is large is avoided through the first protection module and the second protection module.

Description

Technical Field

[0001] The present application relates to the technical field of motor drive, and more specifically, to a drive circuit and a drive device. Background Art

[0002] The motor is connected to the output of the servo drive through a cable so that the motor can complete the corresponding operation. However, due to the influence of the external environment or the length of use, the protective shell of the cable may be damaged, causing a short circuit between the output of the cable and the ground wire. During the process of powering on the motor, the current in the circuit of the servo drive supplying power to the motor is large, which makes the device easy to be damaged or even cause a fire. Utility Model Content

[0003] In view of the above problems, the present application proposes a drive circuit and a drive device. When a short circuit occurs in the circuit of the servo drive supplying power to the motor, the current in the circuit is reduced or the circuit is disconnected to avoid damage to the device due to the impact of the large current. At the same time, the probability of fire accidents caused by the large current can also be reduced.

[0004] In the first aspect, the present application provides a driving circuit, which includes: a multi-phase power supply, a first protection module, a second protection module, a rectifier module, a filter module and an inverter module, wherein: the multi-phase power supply is connected to the input end of the rectifier module, the input end and the output end of the rectifier module are respectively connected to the two ends of the filter module, the two ends of the filter module are respectively connected to the input end and the output end of the inverter module, the first protection module is connected between one end of the filter module and the multi-phase power supply, the second protection module is connected between the other end of the filter module and the multi-phase power supply, and the output end of the inverter module is used to connect the motor; in the event of a short circuit in the driving circuit, the first protection module is used to disconnect the loop between one end of the filter module and the multi-phase power supply; the second protection module is used to reduce the current value on the corresponding loop between the other end of the filter module and the multi-phase power supply; the rectifier module is used to rectify the electrical signal provided by the multi-phase power supply; the filter module is used to filter the electrical signal after rectification; and the inverter module is used to invert the electrical signal after filtering.

[0005] In a second aspect, the present application further provides a driving device, which includes: a motor and a driving circuit as described above.

[0006] The technical solution provided by the present application is a driving circuit comprising: a multi-phase power supply, a first protection module, a second protection module, a rectifier module, a filter module and an inverter module, wherein: the multi-phase power supply is connected to the input end of the rectifier module, the input end and the output end of the rectifier module are respectively connected to the two ends of the filter module, the two ends of the filter module are respectively connected to the input end and the output end of the inverter module, the first protection module is connected between one end of the filter module and the multi-phase power supply, the second protection module is connected between the other end of the filter module and the multi-phase power supply, and the output end of the inverter module is used to connect the motor; in the event of a short circuit in the driving circuit, the first protection module is used to disconnect the loop between one end of the filter module and the multi-phase power supply; the second protection module is used to reduce the current value on the corresponding loop between the other end of the filter module and the multi-phase power supply; the rectifier module is used to rectify the electrical signal provided by the multi-phase power supply; the filter module is used to filter the electrical signal after rectification; and the inverter module is used to invert the electrical signal after filtering. Therefore, when the drive circuit powers on the motor and there is a short circuit in the drive circuit, the first protection module and the second protection module are used to reduce the current value in the drive circuit or disconnect the loop in the drive circuit to avoid a large current in the drive circuit, thereby damaging the components in the drive circuit and effectively reducing the frequency of fire accidents caused by the large current. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments and drawings obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0008] Figure 1 It is a structural schematic diagram of a driving circuit provided in an embodiment of the present application.

[0009] Figure 2 It is a structural schematic diagram of a short-circuit current provided in an embodiment of the present application.

[0010] Figure 3 It is a structural schematic diagram of another short-circuit current provided in an embodiment of the present application.

[0011] Figure 4 It is a structural schematic diagram of a second protection module provided in an embodiment of the present application.

[0012] Figure 5 It is a structural schematic diagram of another driving circuit provided in an embodiment of the present application.

[0013] Figure 6This is a current structure diagram of a first short-circuit loop provided in an embodiment of the present application.

[0014] Figure 7 It is a current structure diagram of a second short-circuit loop and a third short-circuit loop provided in an embodiment of the present application.

[0015] Figure 8 It is a structural schematic diagram of a three-phase power supply provided in an embodiment of the present application.

[0016] Fig. 9 It is a structural schematic diagram of another three-phase power supply provided in an embodiment of the present application.

[0017] Fig.10 It is a structural schematic diagram of a driving device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0019] In the following description, reference is made to "some embodiments", which describes a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict. In the following description, reference is made to the term "multiple" to mean at least two.

[0020] In the following description, the terms "first\second" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0022] The motor is connected to the output of the servo drive through a cable so that the motor can complete the corresponding operation. However, due to the influence of the external environment or the length of use, the protective shell of the cable may be damaged, causing a short circuit between the output of the cable and the ground wire. During the process of powering on the motor, the current in the circuit of the servo drive supplying power to the motor is large, which makes the device easy to be damaged or even cause a fire.

[0023] In the related technology, by equipping devices such as fuses, circuit breakers or residual current operated protective devices (RCD), the circuit between the power supply and the motor can be disconnected when a short circuit occurs between the output of the cable and the ground wire, thereby avoiding fire caused by excessive current.

[0024] However, adding devices such as fuses, circuit breakers or RCDs will increase the cost of the product and occupy space, and since the response speed of devices such as fuses, circuit breakers or RCDs is slow, there is a high probability that the devices will be damaged due to the impact of large currents.

[0025] In order to improve the above-mentioned problems, the present application provides a driving circuit and a driving device, wherein the driving circuit includes: a multi-phase power supply, a first protection module, a second protection module, a rectifier module, a filter module and an inverter module, wherein: the multi-phase power supply is connected to the input end of the rectifier module, the input end and the output end of the rectifier module are respectively connected to the two ends of the filter module, the two ends of the filter module are respectively connected to the input end and the output end of the inverter module, the first protection module is connected between one end of the filter module and the multi-phase power supply, the second protection module is connected between the other end of the filter module and the multi-phase power supply, and the output end of the inverter module is used to connect the motor; in the event of a short circuit in the driving circuit, the first protection module is used to disconnect the loop between one end of the filter module and the multi-phase power supply; the second protection module is used to reduce the current value on the corresponding loop between the other end of the filter module and the multi-phase power supply; the rectifier module is used to rectify the electrical signal provided by the multi-phase power supply; the filter module is used to filter the electrical signal after rectification; and the inverter module is used to invert the electrical signal after filtering.

[0026] Therefore, when the drive circuit powers on the motor and there is a short circuit in the drive circuit, the first protection module and the second protection module are used to reduce the current value in the drive circuit or disconnect the loop in the drive circuit to avoid a large current in the drive circuit, thereby damaging the components in the drive circuit and effectively reducing the frequency of fire accidents caused by the large current.

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0028] See also Figure 1 , Figure 1 Schematic diagram of a driving circuit provided in an embodiment of the present application. Figure 1 As shown, Figure 1The driving circuit 100 includes a multi-phase power supply 110 , a first protection module 120 , a second protection module 130 , a rectification module 140 , a filtering module 150 and an inverter module 160 .

[0029] Among them, the multi-phase power supply 110 is connected to the input end of the rectifier module 140, the input end and the output end of the rectifier module 140 are respectively connected to the two ends of the filter module 150, and the two ends of the filter module 150 are also respectively connected to the input end and the output end of the inverter module 160, the first protection module 120 is connected between one end of the filter module 150 and the multi-phase power supply 110, the second protection module 130 is connected between the other end of the filter module 150 and the multi-phase power supply 110, and the output end of the inverter module 160 is used to connect the motor.

[0030] In some embodiments, the multi-phase power source 110 is a two-phase power source. In other embodiments, the multi-phase power source 110 is a three-phase power source.

[0031] During the process of the drive circuit 100 powering on the motor, the multi-phase power supply 110 provides the electrical signal required for the motor to work. The electrical signal provided by the multi-phase power supply 110 flows to the rectifier module 140, and the rectifier module 140 rectifies the electrical signal provided by the multi-phase power supply 110; the electrical signal after rectification flows to the filter module 150, and the filter module 150 filters the electrical signal after rectification; the electrical signal after filtering flows to the inverter module 160, and the inverter module 160 inverts the electrical signal after filtering, so as to convert the electrical signal provided by the multi-phase power supply 110 into the electrical signal required by the motor through the mutual cooperation among the rectifier module 140, the filter module 150 and the inverter module 160.

[0032] See also Figure 2 , Figure 2 Schematic diagram of a short-circuit current structure provided by an embodiment of the present application. Figure 2 As shown, when the drive circuit 100 powers on the motor and there is a short circuit in the drive circuit 100, the motor is short-circuited, and the electrical signal provided to the motor by the multi-phase power supply 110 will flow to the ground terminal. At this time, there is a first short-circuit loop from the ground terminal - the inverter module 160 - the filter module 150 - one end of the rectifier module 140 - the multi-phase power supply 110. The first protection module 120 disconnects the loop between one end of the filter module 150 and the multi-phase power supply 110, so that under the action of the first protection module 120, the first short-circuit loop is disconnected, thereby avoiding the situation where the bus current on the drive circuit 100 is too large, and also avoiding the impact of the first short-circuit current on the devices on the drive circuit 100.

[0033] Optionally, the first protection module 130 is connected between the multi-phase power supply and the first input terminal of the rectifier module 140. When the drive circuit 100 powers on the motor and there is a first short circuit, the first protection module 130 is in an off state to disconnect the circuit between the multi-phase power supply 110 and one end of the filter module 150, thereby disconnecting the first short circuit.

[0034] Optionally, the first protection module 130 is connected between the first output terminal of the rectifier module 140 and one end of the filter module 150. When the drive circuit 100 powers on the motor and the first short circuit occurs, the first protection module 130 is in an off state to disconnect the circuit between the rectifier module 140 and one end of the filter module 150, thereby disconnecting the circuit between one end of the filter module 150 and the multi-phase power supply 110 to disconnect the first short circuit.

[0035] In some embodiments, the first protection module may be a relay, an IGBT module (Insulated Gate Bipolar Transistor, IGBT), a MOS tube or a thyristor, wherein the MOS tube is a field effect tube (positive channel Metal Oxide Semiconductor, positive MOS).

[0036] It is understandable that the present application does not limit the specific components of the first protection module 120, and any component that can disconnect or connect the loop between one end of the filter module 150 and the multi-phase power supply 110 can be used as the specific component of the first protection module 120. For ease of description, the following description takes the first protection module 120 as the first protection switch S1 as an example.

[0037] When the drive circuit 100 powers on the motor and a short circuit occurs in the drive circuit 100 , the first protection module 120 disconnects the first short circuit loop, thereby preventing the first short circuit current from impacting the components on the drive circuit 100 .

[0038] For further information, see Figure 3 , Figure 3It is a structural schematic diagram of another short-circuit current provided by an embodiment of the present application. In the process of the drive circuit 100 powering on the motor, and when the drive circuit 100 is short-circuited, there is also a second short-circuit loop consisting of the multi-phase power supply 110 - the second protection module 130 - the rectifier module 140 - the other end of the filter module 150 - the inverter module 160 - the grounding end, and a third short-circuit loop consisting of the grounding end - the inverter module 160 - the other end of the filter module 150 - the rectifier module 140 - the second protection module 130 - the multi-phase power supply 110. When there are a second short-circuit loop and a third short-circuit loop, the second protection module 130 reduces the current value in the corresponding loop between the other end of the filter module 150 and the multi-phase power supply 110 to reduce the current value in the second short-circuit loop and the third short-circuit loop, so as to achieve the reduction of the current value in the corresponding loop between the other end of the filter module 150 and the multi-phase power supply 110 under the action of the second protection module 130, so as to avoid excessive current in the corresponding loop between the other end of the filter module 150 and the multi-phase power supply 110, which may cause damage to the components on the drive circuit 100.

[0039] For further information, see Figure 4 , Figure 4 1 is a schematic diagram of the structure of a second protection module provided in an embodiment of the present application. The second protection module 130 includes a current limiting resistor R and a second protection switch S2, and the current limiting resistor R is connected in parallel with the second protection switch S2. When the second short-circuit loop and the third short-circuit loop exist, the second protection switch S2 is disconnected to reduce the current value on the second short-circuit loop and the third short-circuit loop through the current limiting resistor R.

[0040] Optionally, both ends of the current limiting resistor R are also connected to the multi-phase power supply 110 and the second input end of the rectifier module 140. Optionally, both ends of the current limiting resistor R are also connected between the second output end of the rectifier module 140 and the other end of the filter module 150.

[0041] Furthermore, in some embodiments, the filter module 150 is a capacitor, and during the process of powering on the motor, there will be a charging circuit consisting of the multi-phase power supply 110 - the current limiting resistor R - the rectifier module 140 - the other end of the filter module 150 (the positive pole of the filter module 150) - the rectifier module 140 - the first protection switch S1.

[0042] In order to ensure that the filter module 150 can be charged normally, in some embodiments, the driving circuit 100 also includes a control module, which is used to control the first protection module 120 to be in a closed state when it is detected that there is no short circuit in the driving circuit 100; the control module is also used to control the second protection switch S2 to be closed after detecting that the charging of the filter module 150 is completed.

[0043] The control module controls the first protection module 120 to be in a closed state to ensure that the charging circuit consisting of the multi-phase power supply 110 - current limiting resistor R - rectifier module 140 - the other end of the filter module 150 (the positive pole of the filter module 150) - one end of the filter module 150 (the negative pole of the filter module 150) - rectifier module 140 - first protection switch S1 is turned on, thereby charging the filter module 150.

[0044] After the filter module 150 is charged, the control module controls the second protection switch S2 to close, thereby short-circuiting the current limiting resistor R. This is to prevent a large current from flowing through the current limiting resistor R during the process of the multi-phase power supply 110 powering the motor, thereby increasing the power of the current limiting resistor R and causing the current limiting resistor R to burn out.

[0045] The control module determines whether the drive circuit 100 has a short circuit by detecting the current value or voltage value of the bus of the drive circuit 100. For example, if the first protection switch S1 and the second protection switch S2 are in the disconnected state, since there is no charging circuit, the current value or voltage value of the bus of the drive circuit 100 is close to 0 or will not be in a rising state. Therefore, if the current value or voltage value of the bus changes, it means that the drive circuit 100 has a short circuit.

[0046] In some embodiments, the control module may be a controller.

[0047] For further information, see Figure 5 , Figure 5 It is a structural diagram of another driving circuit provided in an embodiment of the present application. In a specific implementation, the rectifier module 140 includes a first rectifier tube D1, a second rectifier tube D2, a third rectifier tube D3 and a fourth rectifier tube D4, wherein: the first rectifier tube D1, the second rectifier tube D2, the third rectifier tube D3 and the fourth rectifier tube D4 are diodes.

[0048] More specifically, the first end of the first rectifier D1 (the negative electrode of the first rectifier D1) is respectively connected to the first end of the third rectifier D3 (the negative electrode of the third rectifier D3) and the other end of the filter module 150, and the second end of the first rectifier D1 (the positive electrode of the first rectifier D1) is respectively connected to the current limiting resistor R and the first end of the second rectifier D2 (the negative electrode of the second rectifier D2).

[0049] The second end of the second rectifier D2 (the negative electrode of the second rectifier D2) is respectively connected to the second end of the fourth rectifier D4 (the positive electrode of the fourth rectifier D4) and one end of the filter module 150; the first end of the third rectifier D3 (the negative electrode of the third rectifier D3) is also connected to the filter module 150, and the second end of the third rectifier D3 (the positive electrode of the third rectifier D3) is connected to the first end of the fourth rectifier D4 (the negative electrode of the fourth rectifier D4); the second end of the fourth rectifier D4 (the positive electrode of the fourth rectifier D4) is also connected to one end of the filter module 150.

[0050] When there is no short circuit in the drive circuit 100 and the motor is powered on, the rectifier module 140 rectifies the electrical signal provided by the multi-phase power supply 110, for example, converts the AC power or AC voltage provided by the multi-phase power supply 110 into corresponding DC power or DC voltage.

[0051] In some embodiments, the inverter module 160 includes a first field effect transistor M1, a second field effect transistor M2, a third field effect transistor M3, a fourth field effect transistor M4, a fifth field effect transistor M5, and a sixth field effect transistor M6, wherein:

[0052] One end of the first field effect transistor M1 (the drain of the first field effect transistor M1) is respectively connected to the other end of the filter module 150 and one end of the third field effect transistor M3 (the drain of the third field effect transistor M3), the other end of the first field effect transistor M1 (the source of the first field effect transistor M1) is connected to one end of the second field effect transistor M2 (the drain of the second field effect transistor M2), and the other end of the first field effect transistor M1 (the source of the first field effect transistor M1) is also used to connect the motor; the other end of the second field effect transistor M2 (the source of the second field effect transistor M2) is respectively connected to one end of the filter module 150 and the other end of the fourth field effect transistor M4 (the source of the fourth field effect transistor M4); one end of the third field effect transistor M3 (the drain of the third field effect transistor M3) is also connected to the fifth field effect transistor M4. One end of the fifth field effect transistor M5 (the drain of the fifth field effect transistor M5) is connected, the other end of the third field effect transistor M3 (the source of the third field effect transistor M3) is connected to one end of the fourth field effect transistor M4 (the drain of the fourth field effect transistor M4), and the other end of the third field effect transistor M3 (the source of the third field effect transistor M3) is also used to connect the motor; the other end of the fourth field effect transistor M4 (the source of the fourth field effect transistor M4) is connected to the other end of the sixth field effect transistor M6 (the source of the sixth field effect transistor M6); the other end of the fifth field effect transistor M5 (the source of the fifth field effect transistor M5) is connected to one end of the sixth field effect transistor M6 (the drain of the sixth field effect transistor M6), and the other end of the fifth field effect transistor M5 (the source of the fifth field effect transistor M5) is also used to connect the motor.

[0053] The inverter module 160 performs inversion processing on the electrical signal processed by the filter module 150, that is, converts the DC power or DC voltage processed by the rectifier module 140 into AC power or AC voltage, so that the electrical signal provided by the three-phase power supply 110 is converted into the electrical signal required by the motor through the mutual cooperation of the rectifier module 140, the filter module 150 and the inverter module 160.

[0054] In some embodiments, the control module and the gates of the first field effect transistor M1, the second field effect transistor M2, the third field effect transistor M3, the fourth field effect transistor M4, the fifth field effect transistor M5, and the sixth field effect transistor M6 are also connected to the control module. When the control module determines that there is no short circuit in the driving circuit 100 and the charging of the filter module 150 is completed, the control module provides the check-in voltage required by the first field effect transistor M1, the second field effect transistor M2, the third field effect transistor M3, the fourth field effect transistor M4, the fifth field effect transistor M5, and the sixth field effect transistor M6, so that the first field effect transistor M1, the second field effect transistor M2, the third field effect transistor M3, the fourth field effect transistor M4, the fifth field effect transistor M5, and the sixth field effect transistor M6 are turned on, thereby inverting the electrical signal processed by the filter module 150.

[0055] Therefore, please refer to Figure 6 , Figure 6 is a current structure diagram of a first short-circuit loop provided in an embodiment of the present application. Figure 6 As shown, when the drive circuit 100 powers on the motor and there is a short circuit in the drive circuit 100, the motor is short-circuited, and the electrical signal provided to the motor by the multi-phase power supply 110 will flow to the ground terminal. The drive circuit 100 has a first short-circuit loop (ground terminal - fifth field effect transistor M5 - positive pole of the filter module 150 - negative pole of the filter module 150 - rectifier module - first protection switch S1 - multi-phase power supply). By controlling the closed state of the first protection switch S1, the first short-circuit loop is disconnected in the presence of the first short-circuit loop, thereby preventing the drive circuit 100 from causing irreversible damage to the components on the drive circuit 100 due to excessive bus current.

[0056] Also, see Figure 7 , Figure 7 : is a current structure diagram of a second short-circuit loop and a third short-circuit loop provided in an embodiment of the present application. Figure 7As shown, when the motor is short-circuited, the drive circuit 100 also has a second short-circuit loop (ground terminal - fifth field effect tube M5 - positive pole of filter module 150 - negative pole of filter module 150 - second rectifier tube D2 - current limiting resistor R - multi-phase power supply 110) and a third short-circuit loop (multi-phase power supply 110 - current limiting resistor R - first rectifier tube D1 - positive pole of filter module 150 - negative pole of filter module 150 - sixth field effect tube M6 - ground terminal). When the drive circuit 100 has a second short-circuit loop and a second short-circuit loop, the second protection switch S2 is in an off state to reduce the current value on the second short-circuit loop and the second short-circuit loop through the current limiting resistor R, thereby avoiding the corresponding current value on the bus of the drive circuit 100.

[0057] See also Figure 8 , Figure 8 Schematic diagram of a three-phase power supply provided in an embodiment of the present application. Figure 8 As shown, when the multi-phase power supply 110 is a three-phase power supply, the rectifier module further includes a fifth rectifier tube D5 and a sixth rectifier tube D6, wherein:

[0058] When the first protection module 120 is disposed between the three-phase power supply and the rectifier module 140, and the second protection module 130 is disposed between the three-phase power supply and the rectifier module 140, the number of the first protection modules 120 corresponds to the phase level of the power supply. Specifically, the positive electrode of the first rectifier tube D1 is connected to one end of the current limiting resistor R and the negative electrode of the second rectifier tube D2, and the negative electrode of the first rectifier tube D1 is connected to the negative electrode of the third rectifier tube D3; the positive electrode of the second rectifier tube D2 is connected to the positive electrode of the fourth rectifier tube D4; The cathode of the third rectifier D3 is connected to the cathode of the fifth rectifier D5, and the anode of the third rectifier D3 is connected to the first protection switch S1 and the cathode of the fourth rectifier D4; the anode of the fourth rectifier D4 is also connected to the anode of the sixth rectifier D6; the cathode of the fifth rectifier D5 is also connected to the anode of the filter module 150, and the anode of the fifth rectifier D5 is also connected to the first protection switch S1 and the cathode of the sixth rectifier D6; the anode of the sixth rectifier D6 is also connected to the cathode of the filter module 150.

[0059] See also Fig. 9 , Fig. 9 Schematic diagram of another three-phase power supply provided in the embodiment of the present application. Fig. 9 As shown, when the first protection module is arranged between the rectifier module 140 and the filter module 150, and the second protection module 130 is arranged between the rectifier module 140 and the filter module 150, only one first protection module 120 is required, and the first short-circuit loop is opened and closed by the first protection module 120. Such an arrangement can reduce the devices required for the drive circuit 100, thereby reducing the cost required for the drive circuit 100.

[0060] It can be understood that when the first protection module 120 is disposed between the three-phase power supply and the rectifier module 140, the second protection module 130 can be disposed between the three-phase power supply and the rectifier module 140, and the second protection module 120 can also be disposed between the rectifier module 140 and the filter module 150. In addition, when the first protection module 120 is disposed between the rectifier module 140 and the filter module 150, the second protection module 130 can be disposed between the three-phase power supply and the rectifier module 140, and the second protection module 130 can also be disposed between the rectifier module 140 and the filter module 150.

[0061] See also Fig.10 , Fig.10 Schematic diagram of a driving device provided in an embodiment of the present application. Fig.10 As shown, the driving device 200 includes: a motor 210 and the above-mentioned driving circuit 100, wherein:

[0062] Electric machinery 210 is an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction.

[0063] The corresponding description of the driving circuit 100 can refer to the above description and will not be repeated here.

[0064] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0065] In several embodiments provided in the present application, the coupling or direct coupling or communication connection between the modules shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or modules, which may be electrical, mechanical or other forms.

[0066] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0067] A driving circuit and a driving device provided in an embodiment of the present application include: a multi-phase power supply, a first protection module, a second protection module, a rectifier module, a filter module and an inverter module, wherein: the multi-phase power supply is connected to the input end of the rectifier module, the input end and the output end of the rectifier module are respectively connected to the two ends of the filter module, the two ends of the filter module are respectively connected to the input end and the output end of the inverter module, the first protection module is connected between one end of the filter module and the multi-phase power supply, the second protection module is connected between the other end of the filter module and the multi-phase power supply, and the output end of the inverter module is used to connect to the motor; in the event of a short circuit in the driving circuit, the first protection module is used to disconnect the loop between one end of the filter module and the multi-phase power supply; the second protection module is used to reduce the current value in the loop between the other end of the filter module and the multi-phase power supply; the rectifier module is used to rectify the electrical signal provided by the multi-phase power supply; the filter module is used to filter the electrical signal after rectification; and the inverter module is used to invert the electrical signal after filtering. Therefore, when the drive circuit powers on the motor and there is a short circuit in the drive circuit, the first protection module and the second protection module are used to reduce the current value in the drive circuit or disconnect the loop in the drive circuit to avoid a large current in the drive circuit, thereby damaging the components in the drive circuit and effectively reducing the frequency of fire accidents caused by the large current.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A driving circuit, characterized in that: It includes a multi-phase power supply, a first protection module, a second protection module, a rectifier module, a filter module and an inverter module, wherein: The multi-phase power supply is connected to the input end of the rectifier module, the input end and the output end of the rectifier module are respectively connected to the two ends of the filter module, the two ends of the filter module are respectively connected to the input end and the output end of the inverter module, the first protection module is connected between one end of the filter module and the multi-phase power supply, the second protection module is connected between the other end of the filter module and the multi-phase power supply, and the output end of the inverter module is used to connect the motor; In the event of a short circuit in the drive circuit, the first protection module is used to disconnect the loop between one end of the filter module and the multi-phase power supply; the second protection module is used to reduce the current value on the corresponding loop between the other end of the filter module and the multi-phase power supply; The rectifier module is used to rectify the electrical signal provided by the multi-phase power supply; The filtering module is used to filter the electrical signal after rectification; The inverter module is used to perform inversion processing on the electric signal after filtering processing.

2. The driving circuit according to claim 1, characterized in that: The first protection module is connected between the multi-phase power supply and the first input terminal of the rectifier module.

3. The driving circuit according to claim 1, characterized in that: The first protection module is connected between the first output end of the rectification module and one end of the filtering module.

4. The driving circuit according to any one of claims 1 to 3, characterized in that: The second protection module includes a current limiting resistor and a second protection switch, the current limiting resistor is connected in parallel with the second protection switch, and two ends of the current limiting resistor are also connected to the multi-phase power supply and the second input end of the rectifier module respectively; The second protection switch is used to be in an open state when a short circuit is detected in the drive circuit, so as to reduce the current value in the loop between the other end of the filter module and the multi-phase power supply through the current limiting resistor.

5. The driving circuit according to any one of claims 1 to 3, characterized in that: The second protection module includes a current limiting resistor and a second protection switch, the current limiting resistor is connected in parallel with the second protection switch, and two ends of the current limiting resistor are also respectively connected between the second output end of the rectifier module and the other end of the filter module; The second protection switch is used to be in an open state when a short circuit is detected in the drive circuit, so as to reduce the current value in the loop between the other end of the filter module and the multi-phase power supply through the current limiting resistor.

6. The driving circuit according to claim 4, characterized in that: It also includes a control module, wherein the control module is used to control the first protection module to be in a closed state when it is detected that there is no short circuit in the driving circuit; The control module is further configured to control the second protection switch to close after detecting that the charging of the filter module is completed.

7. The driving circuit according to claim 4, characterized in that: The rectifier module includes a first rectifier tube, a second rectifier tube, a third rectifier tube and a fourth rectifier tube, wherein: The first end of the first rectifier tube is respectively connected to the first end of the third rectifier tube and the other end of the filter module, and the second end of the first rectifier tube is respectively connected to the current limiting resistor and the first end of the second rectifier tube; The second end of the second rectifier tube is respectively connected to the second end of the fourth rectifier tube and one end of the filter module; The first end of the third rectifier tube is also connected to the filter module, and the second end of the third rectifier tube is connected to the first end of the fourth rectifier tube; The second end of the fourth rectifier tube is also connected to one end of the filter module.

8. The driving circuit according to claim 7, characterized in that: The inverter module includes a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor and a sixth field effect transistor, wherein: One end of the first field effect tube is respectively connected to the other end of the filter module and one end of the third field effect tube, the other end of the first field effect tube is connected to one end of the second field effect tube, and the other end of the first field effect tube is also used to connect to the motor; The other end of the second field effect tube is respectively connected to one end of the filter module and the other end of the fourth field effect tube; One end of the third field effect tube is also connected to one end of the fifth field effect tube, the other end of the third field effect tube is connected to one end of the fourth field effect tube, and the other end of the third field effect tube is also used to connect to the motor; The other end of the fourth field effect tube is connected to the other end of the sixth field effect tube; the other end of the fifth field effect tube is connected to one end of the sixth field effect tube, and the other end of the fifth field effect tube is also used to connect to the motor.

9. The driving circuit according to any one of claims 6 to 8, characterized in that: The first protection module is a relay, an IGBT module, a MOS tube or a thyristor.

10. A driving device, characterized in that: It comprises a motor and a driving circuit as described in any one of claims 1 to 9.

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