Protection device of motor controller, motor controller, motor and air conditioner

Abstract

The invention discloses a protection device of a motor controller, the motor controller, a motor and an air conditioner, and the device comprises an RD protection unit which is arranged between a signal interface used for communicating with a front-end main controller and a driving control circuit, and is used for connecting a connection path between the signal interface and the driving control circuit under the condition that the motor controller has no fault, a power supply and a control signal provided by the front-end main controller are transmitted to the driving control circuit so as to realize self protection of the motor controller; and under the condition that the motor controller has a fault, a connection path between the signal interface and the driving control circuit is disconnected or blocked, so that the motor controller is prevented from voltage backward flowing or current backward flowing into the front-end main controller, and the front-end main controller is protected. According to the scheme, the RD protection unit is arranged at the front end of the motor controller for protection, and voltage backward flowing or current backward flowing into the front-end master controller of the motor controller is avoided, so that the safety of the front-end master controller is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of motor technology, and specifically relates to a motor controller protection device, a motor controller, a motor and an air conditioner, and more particularly to a motor controller protection circuit, a motor controller, a motor and an air conditioner that can protect a front-end main controller from damage caused by reverse voltage shocks. Background Art

[0002] The motor controller is used to invert the DC voltage (i.e., direct current voltage) provided by the front-end main controller (such as the main board of the air conditioner main controller) and output it to the motor windings, and control the operation of the motor. However, if the motor controller is damaged, the voltage of the front-end main controller will suddenly change and be damaged.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The object of the present invention is to provide a motor controller protection device, a motor controller, a motor and an air conditioner to solve the problem that when the motor controller is damaged, the voltage of the front-end main controller of the motor controller (such as the main board of the air conditioner main controller) will suddenly change and be damaged. By setting an RD protection unit at the front end of the motor controller for protection, voltage backflow or current backflow from the motor controller to the front-end main controller is avoided to ensure the safety of the front-end main controller.

[0005] The present invention provides a protection device for a motor controller, wherein the motor controller is used to control the operation of a rear-end motor based on a power supply and a control signal provided by a front-end main controller; the motor controller has a signal interface and a drive control circuit; the protection device for the motor controller comprises: an RD protection unit; wherein the RD protection unit is arranged between the signal interface and the drive control circuit, and is used to connect a connection path between the signal interface and the drive control circuit when the motor controller is fault-free, and transmit the power supply and control signal provided by the front-end main controller to the drive control circuit to protect the motor controller itself; and, when the motor controller is faulty, disconnect or block the connection path between the signal interface and the drive control circuit to prevent the motor controller from voltage backflow or current backflow into the front-end main controller, thereby protecting the front-end main controller.

[0006] In some embodiments, the RD protection unit includes: a resistor module and a diode module arranged in parallel; wherein the signal interface is connected to the anode of the diode module, and the cathode of the diode module can be connected to the drive control circuit; when in use, the resistor module or the diode module can be selected for use; and the reverse withstand voltage value of the diode module is greater than the value of the VDC input voltage in the power supply and control signal provided by the front-end main controller; wherein, when the resistor module is selected, the resistor module is used to connect the resistor module itself when the motor controller is not faulty, so as to connect the connection path between the signal interface and the drive control circuit; and, when the motor controller is faulty, the resistor module itself is disconnected to disconnect the connection path between the signal interface and the drive control circuit; when the diode module is selected, the diode module is used to forward conduct the diode module when the motor controller is not faulty, so as to connect the connection path between the signal interface and the drive control circuit; and, when the motor controller is faulty, the diode module is reversely cut off to block the connection path between the signal interface and the drive control circuit.

[0007] In some embodiments, it also includes: an interference suppression unit; wherein the interference suppression unit is arranged between the RD protection unit and the drive control circuit, and is used to suppress interference signals within a set frequency range of the power supply and control signals provided by the front-end main controller, so as to achieve further protection processing of the power supply and control signals provided by the front-end main controller.

[0008] In some embodiments, the interference suppression unit includes: an inductor module or a magnetic bead module.

[0009] In some embodiments, it also includes: a filtering unit; wherein the filtering unit is arranged between the RD protection unit and the drive control circuit, and is used to filter the power supply and control signal provided by the front-end main controller, so as to achieve further protection processing of the power supply and control signal provided by the front-end main controller; wherein, when the protection device of the motor controller also includes an interference suppression unit, the filtering unit is located between the interference suppression unit and the drive control circuit, and is connected between the common end of the interference suppression unit and the drive control circuit and the ground.

[0010] In some implementations, the filtering unit includes: a first capacitor module and a second capacitor module; wherein the first capacitor module and the second capacitor module are arranged in parallel.

[0011] In some embodiments, it also includes: a Zener diode module; wherein the RD protection unit can be connected to the cathode of the Zener diode module; the anode of the Zener diode module is grounded; when the protection device of the motor controller also includes an interference suppression unit and a filtering unit, the RD protection unit is connected to the drive control circuit after the interference suppression unit; the filtering unit and the Zener diode module are located between the interference suppression unit and the drive control circuit; the common end of the interference suppression unit and the drive control circuit is grounded after the filtering unit and the Zener diode module respectively; and the common end of the interference suppression unit and the drive control circuit is connected to the cathode of the Zener diode module.

[0012] Matching the above device, the present invention further provides a motor controller, including: the protection device of the motor controller described above.

[0013] Matching the above-mentioned device, the present invention further provides a motor on the other hand, including: the protection device of the motor controller mentioned above, or the motor controller mentioned above.

[0014] Matching the above-mentioned device, the present invention provides an air conditioner on another aspect, including: the protection device of the motor controller mentioned above, or the motor controller mentioned above, or the motor mentioned above.

[0015] Therefore, the scheme of the present invention is to set a protection circuit composed of an RD protection unit (such as a resistor R1 and a diode D1), an inductor module (such as an inductor L1), a capacitor module (such as a capacitor C1 and a capacitor C2), and a voltage-stabilizing diode module (such as a voltage-stabilizing diode D2) at the front end of the motor controller, so that the front end main controller is connected to the motor controller after passing through the protection circuit; when the motor controller is operating normally, the input power provided by the front end main controller is subjected to anti-interference, filtering and voltage stabilization processing through the protection circuit; when the motor controller fails, the loop between the motor controller and the front end main controller is cut off through the protection circuit to prevent the motor controller from backflowing voltage or current into the front end main controller; thus, by setting the RD protection unit at the front end of the motor controller for protection, the motor controller is prevented from backflowing voltage or current into the front end main controller, so as to ensure the safety of the front end main controller.

[0016] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a protection device for a motor controller of the present invention;

[0019] Figure 2 It is a structural diagram of the connection relationship between the brushless DC motor and the air conditioner main controller;

[0020] Figure 3 It is a schematic diagram of the installation structure of the protection circuit between the front end and the back end;

[0021] Figure 4 It is a structural diagram of the protection circuit. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Considering that the motor controller is composed of power module, driver chip, peripheral interface circuit, etc. The power supply of the power module mainly includes high-voltage side (MOS tube side) power supply and low-voltage side (front drive side) power supply. The function of the high-voltage side power supply is to provide high voltage to the motor winding, and the function of the low-voltage side power supply is to provide a lower voltage to drive the MOS tube to turn on.

[0024] Among them, the low-voltage side power supply is taken from the front-end main controller power supply of the motor controller (that is, the switching power supply at the front-end main controller), and the front-end main controller power supply is connected to various other branches of electricity, which involves a wide range of aspects. The high-voltage impact of the front-end main controller can easily damage the motor controller, and after the motor controller is damaged, a large current may reversely impact the front-end main controller, causing damage to the front-end main controller, that is, the front-end main controller is damaged due to a sudden voltage change caused by the damage to the back end, thus causing a major quality accident; at the same time, there are also serious safety hazards, which reduces product quality. Therefore, it is necessary to design a protection circuit for the motor controller to solve the above problems.

[0025] Therefore, the scheme of the present invention proposes a protection device for a motor controller, specifically a protection circuit of the motor controller that can protect the front-end main controller from damage due to reverse voltage shock. By setting a protection circuit at the front end of the motor controller, the motor controller has the ability to prevent backflow voltage and resist shock. When the motor controller is damaged, the backflow voltage of the motor controller to the front-end main controller can be effectively prevented, and the reverse current of the motor controller can be cut off, thereby avoiding damage to the front-end main controller caused by voltage mutation due to damage to the motor controller, thereby ensuring the safety of the front-end main controller.

[0026] According to an embodiment of the present invention, a protection device for a motor controller is provided. Figure 1 The schematic diagram of the structure of an embodiment of the device of the present invention is shown. The motor controller is arranged between the front-end main controller and the rear-end motor, and is used to control the operation of the rear-end motor based on the power supply and control signal provided by the front-end main controller; wherein the front-end main controller refers to the main controller located at the front end of the motor controller; the rear-end motor refers to the motor located at the rear end of the motor controller. Figure 2 The diagram is a structural diagram of the connection between the brushless DC motor and the air conditioner main controller. Figure 2 As shown in FIG. 1 , the power supply and control signal of the motor controller are provided by the front-end main controller (such as the air conditioner main controller) and are processed by the motor controller before being sent to the brushless DC motor. Figure 2 In the example shown, the air conditioner main controller provides a power signal to the motor controller, and the air conditioner main controller also provides a control signal to the motor controller. The motor controller performs inversion processing based on the power signal and supplies power to the motor winding of the DC brushless motor (such as motor M). The motor controller also controls the operation of the motor based on the control signal. The motor drives the load to operate. Among them, the power signal is such as a VDC signal (i.e., a high-voltage power signal), a VCC signal (i.e., a low-voltage power signal), a GND signal (i.e., a ground signal), etc. The control signal is such as a VSP signal (i.e., a speed control signal), a FG signal (i.e., a flywheel generated signal of the motor), etc. The protection device of the motor controller is arranged at the front end of the motor controller and is located between the front-end main controller and the motor controller; the motor controller has a signal interface (such as a power supply and signal port in the motor controller) and a drive control circuit, and the power supply and signal port in the motor controller are used to be connected to the power supply and signal port in the front-end main controller; the drive control circuit is used to control the operation of the rear-end motor based on the power supply and control signal provided by the front-end main controller; the protection device of the motor controller includes: an RD protection unit.

[0027] The RD protection unit is arranged between the signal interface and the drive control circuit, and is used to connect the connection path between the signal interface and the drive control circuit when the motor controller is fault-free, and after protecting the power supply and control signal provided by the front-end main controller, transmit the power supply and control signal provided by the front-end main controller to the drive control circuit to enable the drive control circuit to control the operation of the rear-end motor, so as to protect the motor controller itself. And,

[0028] The RD protection unit is also used to disconnect or block the connection path between the signal interface and the drive control circuit when the motor controller fails, so as to prevent the motor controller from backflowing voltage or current into the front-end main controller, thereby protecting the front-end main controller. The signal interface on the motor controller is an interface provided on the motor controller for communicating with the front-end main controller to at least receive power and control signals sent by the front-end main controller.

[0029] Figure 3 The figure is a schematic diagram of the installation structure of the protection circuit between the front end and the back end. Figure 3 As shown, the front-end main control area of ​​the front-end main controller has a main control area, and a power supply and signal port. The motor controller of the brushless DC motor has a power supply and signal port, a protection circuit, and a drive control circuit. The power supply and signal port of the front-end main control area are connected to the power supply and signal port of the motor controller. The protection circuit can reversely isolate the reverse impact current of the drive control circuit.

[0030] The solution of the present invention provides a protection solution for a motor controller that can protect a front-end main controller from damage caused by reverse voltage shock. By setting a protection circuit at the front end of the motor controller, the motor controller has the ability to prevent backflow voltage and resist shock. When the motor controller is damaged, the backflow voltage from the motor controller to the front-end main controller can be effectively prevented, and the reverse current of the motor controller can be cut off, thereby protecting the electronic components in the motor controller circuit from damage caused by the shock, thereby ensuring the normal and safe operation of the front-end main controller circuit.

[0031] In some embodiments, the RD protection unit includes: a resistor module and a diode module arranged in parallel, the resistor module being as follows: Figure 4 The resistor R1 and diode modules are shown as Figure 4The diode D1 shown in the figure. The signal interface is connected to the anode of the diode module, and the cathode of the diode module can be connected to the drive control circuit; when in use, the resistor module or the diode module can be selected for use; and the reverse withstand voltage value of the diode module is greater than the value of the VDC input voltage in the power supply and control signal provided by the front-end main controller.

[0032] Among them, when the resistance module is selected, the resistance module is used to connect the resistance module itself when the motor controller is fault-free, so as to connect the connection path between the signal interface and the drive control circuit, and limit the current of the power supply and control signal provided by the front-end main controller to achieve protection processing of the power supply and control signal provided by the front-end main controller, and then transmit the power supply and control signal provided by the front-end main controller to the drive control circuit, so that the drive control circuit controls the operation of the rear-end motor to achieve protection of the motor controller itself; and, when the motor controller is faulty, the resistance module itself is disconnected to disconnect the connection path between the signal interface and the drive control circuit to prevent the motor controller from voltage backflow or current backflow into the front-end main controller, so as to protect the front-end main controller.

[0033] The resistor module is also used for, when the diode module is selected, to forward conduct the diode module when the motor controller is fault-free, so as to connect the connection path between the signal interface and the drive control circuit, and then transmit the power supply and control signal provided by the front-end main controller to the drive control circuit, so that the drive control circuit controls the operation of the rear-end motor to protect the motor controller itself; and, when the motor controller fails, to reverse cut off the diode module to block the connection path between the signal interface and the drive control circuit, so as to prevent the motor controller from backflowing voltage or current into the front-end main controller, so as to protect the front-end main controller.

[0034] Figure 4 Figure 1 is a schematic diagram of the protection circuit structure. Figure 4 The protection circuit shown is a reverse isolation protection circuit with the ability to prevent backflow voltage and resist impact. Figure 4In the example shown, the RD protection unit is a resistor R1 and a diode D1 connected in parallel and one of the two is selected: if the resistor R1 is selected and the resistor R1 = 0 ohm, it plays a role of disconnecting under a large voltage impact to protect the safety of the back-end line; if the diode D1 is selected, it plays a role of preventing the back-end voltage and current from flowing back to achieve reverse isolation, so that the protection circuit can be used as a protection circuit compatible with reverse isolation. Among them, the selection of the diode D1 can be selected according to the reverse withstand voltage value of the diode D1. The diode D1 whose reverse withstand voltage value of the diode D1 is greater than the VDC input voltage must be selected to prevent the reverse voltage of the diode D1 from being too low and damaging the diode D1. Among them, the resistor R1 is a 0Ω resistor or a common resistor in a 1206 package (the actual resistance of the 0Ω resistor is about 0.05Ω), and the power is 0.25W. When a high-voltage backflow short circuit occurs, the instantaneous power is as high as megawatts, such as (310-15)2÷0.05=1740500W.

[0035] In some embodiments, the protection device of the motor controller further includes: an interference suppression unit. The interference suppression unit is arranged between the RD protection unit and the drive control circuit, and is used to suppress interference signals within a set frequency range of the power supply and control signal provided by the front-end main controller, so as to further protect the power supply and control signal provided by the front-end main controller.

[0036] In the scheme of the present invention, by setting the interference suppression unit between the RD protection unit and the drive control circuit, the interference signals (such as high-frequency interference signals) within the set frequency range of the power supply and control signals provided by the front-end main controller are suppressed, thereby improving the quality of the power supply and control signals transmitted to the drive control circuit and improving the safety of the operation of the motor controller.

[0037] In some embodiments, the interference suppression unit includes: an inductor module or a magnetic bead module, the inductor module is as follows: Figure 4 Inductor L1 is shown.

[0038] In such Figure 4 In the example shown, the inductor L1 is equivalent to a resistor and an inductor in series, which is inductive at low frequencies and resistive at high frequencies. The higher the frequency, the greater the impedance, thereby suppressing the high-frequency interference of the input power supply (i.e., the VCC power supply provided by the front-end main controller). Figure 4 In the example shown, the inductor L1 can also be a magnetic bead. After the magnetic bead is connected in series in the circuit where the RD protection unit is located, it plays a role in suppressing current mutation and preventing the rear-end output voltage from being too high.

[0039] In some embodiments, the protection device of the motor controller further includes: a filtering unit. The filtering unit is arranged between the RD protection unit and the drive control circuit, and is used to filter the power supply and control signal provided by the front-end main controller to further protect the power supply and control signal provided by the front-end main controller.

[0040] Wherein, when the protection device of the motor controller further includes an interference suppression unit, the filtering unit is located between the interference suppression unit and the drive control circuit, and is connected between the common end of the interference suppression unit and the drive control circuit and the ground.

[0041] In the scheme of the present invention, by setting the filtering unit between the RD protection unit and the drive control circuit to filter the power supply and control signal provided by the front-end main controller, the quality of the power supply and control signal transmitted to the drive control circuit can be further improved, and the safety of the motor controller operation can be further improved.

[0042] In some implementations, the filtering unit includes: a first capacitor module and a second capacitor module; wherein the first capacitor module and the second capacitor module are arranged in parallel.

[0043] In such Figure 4 In the example shown, the first capacitor module is as follows Figure 4 The capacitor C1 shown in FIG. Figure 4 The capacitor C2, the capacitor C1 and the capacitor C2 are all filter capacitors, which can smooth voltage mutations and filter high-frequency noise, and can maintain a certain reaction time after power failure.

[0044] In addition, in Figure 4 In the example shown, the inductor L1 can also be a magnetic bead. After the magnetic bead is connected in series in the circuit where the RD protection unit is located, it is connected to the capacitor C1, the capacitor C2 and the voltage-stabilizing diode D2 to suppress the sudden change of current and prevent the back-end output voltage from being too high, so that the protection circuit forms a circuit that resists power supply interference and voltage surge impact.

[0045] In some embodiments, the protection device of the motor controller further includes: a voltage regulator diode module, such as Figure 4 The Zener diode D2 shown in the figure; wherein the RD protection unit can be connected to the cathode of the Zener diode module; the anode of the Zener diode module is grounded.

[0046] Among them, when the protection device of the motor controller also includes an interference suppression unit and a filtering unit, the RD protection unit is connected to the drive control circuit after passing through the interference suppression unit; the filtering unit and the Zener diode module are located between the interference suppression unit and the drive control circuit; the common end of the interference suppression unit and the drive control circuit is grounded after passing through the filtering unit and the Zener diode module respectively; and the common end of the interference suppression unit and the drive control circuit is connected to the cathode of the Zener diode module.

[0047] like Figure 4 The protection circuit shown includes: an RD protection unit, an inductor L1, a capacitor C1, a capacitor C2, and a voltage-stabilizing diode D2. The RD protection unit is composed of a diode D1 and a resistor R1 in parallel. In actual applications, the diode D1 or the resistor R1 is selected according to different customer needs, so that different customers can match and use it compatibly. Among them, the power supply VCC provided by the front-end main controller is connected to the ground GND after passing through the RD protection unit and the inductor L1, and the capacitor C1 and capacitor C2 are connected in parallel. The power supply VCC provided by the front-end main controller is also connected to the cathode of the voltage-stabilizing diode D2 after passing through the RD protection unit and the inductor L1, and the anode of the voltage-stabilizing diode D2 is grounded. The cathode of the voltage-stabilizing diode D2 is also connected to the output end of the power supply VCC1. The capacitor C1, the capacitor C2 and the voltage-stabilizing diode D2 are sequentially arranged between the inductor L1 and the output end of the power supply VCC1. The resistor R1 and the diode D1 are connected in parallel, and the power supply VCC provided by the front-end main controller is connected to the anode of the diode D1. The selection of resistor R1 and Zener diode D2 is determined by whether the customer has special requirements. For example, if the customer has safety requirements, the connecting branch must be disconnected when a short circuit occurs. In this case, resistor R1 must be selected. When resistor R1 is selected, it can instantly burn out the resistor when high voltage backflow occurs, and the front and rear connecting branches can be disconnected. In other words, when high voltage backflow occurs, resistor R1 burns out and is in an open circuit state.

[0048] See also Figure 4 In the example shown, when the VCC power supply provided by the front-end main controller is in normal input working state, the VCC power supply provided by the front-end main controller first passes through the diode D1, and the diode D1 is in the forward conduction state at this time; then it flows to the inductor L1 through the diode D1. The inductor L1 is equivalent to a resistor and an inductor in series here. The low frequency is inductive and the high frequency is resistive. The higher the frequency, the greater the impedance, thereby suppressing the high-frequency interference of the input power supply (that is, the VCC power supply provided by the front-end main controller). Capacitor C1 and capacitor C2 are both filter capacitors, which can smooth voltage mutations, filter out high-frequency noise, and maintain a certain reaction time after the power is cut off. The voltage regulator diode D2 is used to maintain the stability of the output voltage VCC1, stabilize the voltage at its rated voltage value, and prevent the output voltage VCC1 from overvoltage and damaging the back-end circuit. It can be seen that, Figure 4 The protection circuit shown, when the VCC power supply provided by the front-end main controller is in normal input working state, can effectively suppress the high-frequency interference and voltage mutation of the input power supply (i.e., the VCC power supply provided by the front-end main controller), and play a role in maintaining voltage stability, thereby providing reliable and high-quality power supply guarantee for the operation of the back-end circuit (such as a motor).

[0049] See also Figure 4 In the example shown, when voltage backflow occurs, that is, when the inverter module of the motor controller is damaged and the low-voltage VCC power supply and the high-voltage VDC power supply on the motor controller side are short-circuited, the high-voltage VDC on the motor controller side will enter the front-end main controller through the low-voltage VCC. At this time, when the backflow voltage flows to the diode D1, due to the characteristics of the diode D1 being forward-conducting and reverse-cutoff, the diode D1 can cut off the reverse current flow, completely blocking the current loop of the voltage backflow, as shown in FIG. Figure 3 As shown, the reverse isolation of the diode D1 protects the front-end main controller from being damaged by the high voltage impact caused by the voltage backflow.

[0050] The protection circuit of the motor controller provided by the solution of the present invention has a strong ability to resist voltage fluctuations and impacts, can quickly isolate the faulty end, and effectively solves the damage to the front-end main controller caused by voltage mutation due to damage to the back-end (i.e., the motor controller); it is highly practical, has a fast response speed, and is safe and reliable, and has the characteristics of a wide range of applications, stability and reliability, etc.

[0051] According to the technical solution of the present invention, a protection circuit composed of an RD protection unit (such as a resistor R1 and a diode D1), an inductor module (such as an inductor L1), a capacitor module (such as a capacitor C1 and a capacitor C2), and a voltage-stabilizing diode module (such as a voltage-stabilizing diode D2) is set at the front end of the motor controller, so that the front end main controller is connected to the motor controller after passing through the protection circuit; when the motor controller is operating normally, the input power provided by the front end main controller is subjected to anti-interference, filtering and voltage stabilization processing through the protection circuit; when the motor controller fails, the loop between the motor controller and the front end main controller is cut off through the protection circuit to prevent the motor controller from backflowing voltage or current into the front end main controller; thus, by setting the RD protection unit at the front end of the motor controller for protection, the motor controller is prevented from backflowing voltage or current into the front end main controller, so as to ensure the safety of the front end main controller.

[0052] According to an embodiment of the present invention, a motor controller corresponding to a protection device of the motor controller is also provided. The motor controller may include: the protection device of the motor controller described above.

[0053] In the solution of the present invention, the motor controller is arranged between the front-end main controller and the back-end motor, and is used to control the operation of the back-end motor based on the power supply and control signal provided by the front-end main controller; wherein the front-end main controller refers to the main controller located at the front end of the motor controller; the back-end motor refers to the motor located at the back end of the motor controller. Figure 2 As shown in FIG. 1 , the power supply and control signal of the motor controller are provided by the front-end main controller (such as the air conditioner main controller) and are processed by the motor controller before being sent to the brushless DC motor. Figure 2 In the example shown, the air conditioner main controller provides a power signal to the motor controller, and the air conditioner main controller also provides a control signal to the motor controller. The motor controller performs inversion processing based on the power signal and supplies power to the motor winding of the DC brushless motor (such as motor M). The motor controller also controls the operation of the motor based on the control signal. The motor drives the load to operate. Among them, the power signal is such as a VDC signal (i.e., a high-voltage power signal), a VCC signal (i.e., a low-voltage power signal), a GND signal (i.e., a ground signal), etc. The control signal is such as a VSP signal (i.e., a speed control signal), a FG signal (i.e., a flywheel generated signal of the motor), etc. The protection device of the motor controller is arranged at the front end of the motor controller and is located between the front-end main controller and the motor controller; the motor controller has a signal interface (such as a power supply and signal port in the motor controller) and a drive control circuit, and the power supply and signal port in the motor controller are used to be connected to the power supply and signal port in the front-end main controller; the drive control circuit is used to control the operation of the rear-end motor based on the power supply and control signal provided by the front-end main controller; the protection device of the motor controller includes: an RD protection unit.

[0054] Wherein, the RD protection unit is arranged between the signal interface and the drive control circuit, and is used to connect the connection path between the signal interface and the drive control circuit when the motor controller is fault-free, and after performing protection processing on the power supply and control signal provided by the front-end main controller when protection is possible, transmit the power supply and control signal provided by the front-end main controller to the drive control circuit, so that the drive control circuit controls the operation of the rear-end motor, so as to protect the motor controller itself; and,

[0055] The RD protection unit is also used to disconnect or block the connection path between the signal interface and the drive control circuit when the motor controller fails, so as to prevent the motor controller from having voltage or current backflow into the front-end main controller, thereby protecting the front-end main controller.

[0056] like Figure 3As shown, the front-end main control area of ​​the front-end main controller has a main control area, and a power supply and signal port. The motor controller of the brushless DC motor has a power supply and signal port, a protection circuit, and a drive control circuit. The power supply and signal port of the front-end main control area are connected to the power supply and signal port of the motor controller. The protection circuit can reversely isolate the reverse impact current of the drive control circuit.

[0057] In the scheme of the present invention, a protection circuit is set at the front end of the motor controller so that the motor controller has the ability to prevent backflow voltage and resist impact. When the motor controller is damaged, the backflow voltage from the motor controller to the front-end main controller can be effectively prevented, and the reverse current of the motor controller can be cut off, thereby protecting the electronic components in the motor controller circuit from impact damage and ensuring the normal and safe operation of the front-end main controller circuit.

[0058] In some embodiments, the RD protection unit includes: a resistor module and a diode module arranged in parallel, the resistor module being as follows: Figure 4 The resistor R1 and diode modules are shown as Figure 4 The diode D1 shown in the figure. The signal interface is connected to the anode of the diode module, and the cathode of the diode module can be connected to the drive control circuit; when in use, the resistor module or the diode module can be selected for use; and the reverse withstand voltage value of the diode module is greater than the value of the VDC input voltage in the power supply and control signal provided by the front-end main controller.

[0059] Among them, when the resistance module is selected, the resistance module is used to connect the resistance module itself when the motor controller is fault-free, so as to connect the connection path between the signal interface and the drive control circuit, and limit the current of the power supply and control signal provided by the front-end main controller to achieve protection processing of the power supply and control signal provided by the front-end main controller, and then transmit the power supply and control signal provided by the front-end main controller to the drive control circuit, so that the drive control circuit controls the operation of the rear-end motor to achieve protection of the motor controller itself; and, when the motor controller is faulty, the resistance module itself is disconnected to disconnect the connection path between the signal interface and the drive control circuit to prevent the motor controller from voltage backflow or current backflow into the front-end main controller, so as to protect the front-end main controller.

[0060] When the diode module is selected, the diode module is used to, when the motor controller is fault-free, enable the diode module to be forward-conducted to connect the connection path between the signal interface and the drive control circuit, and then transmit the power supply and control signal provided by the front-end main controller to the drive control circuit, so that the drive control circuit controls the operation of the rear-end motor to protect the motor controller itself; and, when the motor controller is faulty, enable the diode module to be reverse-cut off to block the connection path between the signal interface and the drive control circuit to prevent the motor controller from backflowing voltage or current into the front-end main controller, thereby protecting the front-end main controller.

[0061] like Figure 4 The protection circuit shown is a reverse isolation protection circuit with the ability to prevent backflow voltage and resist impact. Figure 4 In the example shown, the RD protection unit is a resistor R1 and a diode D1 connected in parallel and one of the two is selected: if the resistor R1 is selected and the resistor R1 = 0 ohm, it plays a role of disconnecting under a large voltage impact to protect the safety of the back-end line; if the diode D1 is selected, it plays a role of preventing the back-end voltage and current from flowing back to achieve reverse isolation, so that the protection circuit can be used as a protection circuit compatible with reverse isolation. Among them, the selection of the diode D1 can be selected according to the reverse withstand voltage value of the diode D1. The diode D1 whose reverse withstand voltage value of the diode D1 must be selected is greater than the VDC input voltage to prevent the reverse voltage of the diode D1 from being too low and damaging the diode D1.

[0062] In some embodiments, the protection device of the motor controller further includes: an interference suppression unit. The interference suppression unit is arranged between the RD protection unit and the drive control circuit, and is used to suppress interference signals within a set frequency range of the power supply and control signal provided by the front-end main controller, so as to further protect the power supply and control signal provided by the front-end main controller.

[0063] In the scheme of the present invention, by setting the interference suppression unit between the RD protection unit and the drive control circuit, the interference signals (such as high-frequency interference signals) within the set frequency range of the power supply and control signals provided by the front-end main controller are suppressed, thereby improving the quality of the power supply and control signals transmitted to the drive control circuit and improving the safety of the operation of the motor controller.

[0064] In some embodiments, the interference suppression unit includes: an inductor module or a magnetic bead module, the inductor module is as follows: Figure 4 Inductor L1 is shown.

[0065] In such Figure 4In the example shown, the inductor L1 is equivalent to a resistor and an inductor in series, which is inductive at low frequencies and resistive at high frequencies. The higher the frequency, the greater the impedance, thereby suppressing the high-frequency interference of the input power supply (i.e., the VCC power supply provided by the front-end main controller). Figure 4 In the example shown, the inductor L1 can also be a magnetic bead. After the magnetic bead is connected in series in the circuit where the RD protection unit is located, it plays a role in suppressing current mutation and preventing the rear-end output voltage from being too high.

[0066] In some embodiments, the protection device of the motor controller further includes: a filtering unit. The filtering unit is arranged between the RD protection unit and the drive control circuit, and is used to filter the power supply and control signal provided by the front-end main controller to further protect the power supply and control signal provided by the front-end main controller.

[0067] Wherein, when the protection device of the motor controller further includes an interference suppression unit, the filtering unit is located between the interference suppression unit and the drive control circuit, and is connected between the common end of the interference suppression unit and the drive control circuit and the ground.

[0068] In the scheme of the present invention, by setting the filtering unit between the RD protection unit and the drive control circuit to filter the power supply and control signal provided by the front-end main controller, the quality of the power supply and control signal transmitted to the drive control circuit can be further improved, and the safety of the motor controller operation can be further improved.

[0069] In some implementations, the filtering unit includes: a first capacitor module and a second capacitor module; wherein the first capacitor module and the second capacitor module are arranged in parallel.

[0070] In such Figure 4 In the example shown, the first capacitor module is as follows Figure 4 The capacitor C1 shown in FIG. Figure 4 The capacitor C2, the capacitor C1 and the capacitor C2 are all filter capacitors, which can smooth voltage mutations and filter high-frequency noise, and can maintain a certain reaction time after power failure.

[0071] In addition, in Figure 4 In the example shown, the inductor L1 can also be a magnetic bead. After the magnetic bead is connected in series in the circuit where the RD protection unit is located, it is connected to the capacitor C1, the capacitor C2 and the voltage-stabilizing diode D2 to suppress the sudden change of current and prevent the back-end output voltage from being too high, so that the protection circuit forms a circuit that resists power supply interference and voltage surge impact.

[0072] In some embodiments, the protection device of the motor controller further includes: a voltage regulator diode module, such as Figure 4 The Zener diode D2 shown in the figure; wherein the RD protection unit can be connected to the cathode of the Zener diode module; the anode of the Zener diode module is grounded.

[0073] Among them, when the protection device of the motor controller also includes an interference suppression unit and a filtering unit, the RD protection unit is connected to the drive control circuit after passing through the interference suppression unit; the filtering unit and the Zener diode module are located between the interference suppression unit and the drive control circuit; the common end of the interference suppression unit and the drive control circuit is grounded after passing through the filtering unit and the Zener diode module respectively; and the common end of the interference suppression unit and the drive control circuit is connected to the cathode of the Zener diode module.

[0074] like Figure 4 The protection circuit shown includes: an RD protection unit, an inductor L1, a capacitor C1, a capacitor C2, and a voltage-stabilizing diode D2. The RD protection unit is composed of a diode D1 and a resistor R1 in parallel. In actual applications, the diode D1 or the resistor R1 is selected according to different customer needs, so that different customers can match and use it compatibly. Among them, the power supply VCC provided by the front-end main controller is connected to the ground GND after passing through the RD protection unit and the inductor L1, and the capacitor C1 and capacitor C2 are connected in parallel. The power supply VCC provided by the front-end main controller is also connected to the cathode of the voltage-stabilizing diode D2 after passing through the RD protection unit and the inductor L1, and the anode of the voltage-stabilizing diode D2 is grounded. The cathode of the voltage-stabilizing diode D2 is also connected to the output end of the power supply VCC1. The capacitor C1, the capacitor C2 and the voltage-stabilizing diode D2 are sequentially arranged between the inductor L1 and the output end of the power supply VCC1. The resistor R1 and the diode D1 are connected in parallel, and the power supply VCC provided by the front-end main controller is connected to the anode of the diode D1.

[0075] See also Figure 4 In the example shown, when the VCC power supply provided by the front-end main controller is in normal input working state, the VCC power supply provided by the front-end main controller first passes through the diode D1, and the diode D1 is in the forward conduction state at this time; then it flows to the inductor L1 through the diode D1. The inductor L1 is equivalent to a resistor and an inductor in series here. The low frequency is inductive and the high frequency is resistive. The higher the frequency, the greater the impedance, thereby suppressing the high-frequency interference of the input power supply (that is, the VCC power supply provided by the front-end main controller). Capacitor C1 and capacitor C2 are both filter capacitors, which can smooth voltage mutations, filter out high-frequency noise, and maintain a certain reaction time after the power is cut off. The voltage regulator diode D2 is used to maintain the stability of the output voltage VCC1, stabilize the voltage at its rated voltage value, and prevent the output voltage VCC1 from overvoltage and damaging the back-end circuit. It can be seen that, Figure 4The protection circuit shown, when the VCC power supply provided by the front-end main controller is in normal input working state, can effectively suppress the high-frequency interference and voltage mutation of the input power supply (i.e., the VCC power supply provided by the front-end main controller), and play a role in maintaining voltage stability, thereby providing reliable and high-quality power supply guarantee for the operation of the back-end circuit (such as a motor).

[0076] See also Figure 4 In the example shown, when voltage backflow occurs, that is, when the inverter module of the motor controller is damaged and the low-voltage VCC power supply and the high-voltage VDC power supply on the motor controller side are short-circuited, the high-voltage VDC on the motor controller side will enter the front-end main controller through the low-voltage VCC. At this time, when the backflow voltage flows to the diode D1, due to the characteristics of the diode D1 being forward-conducting and reverse-cutoff, the diode D1 can cut off the reverse current flow, completely blocking the current loop of the voltage backflow, as shown in FIG. Figure 3 As shown, the reverse isolation of the diode D1 protects the front-end main controller from being damaged by the high voltage impact caused by the voltage backflow.

[0077] In the scheme of the present invention, the motor controller has the protection circuit of the motor controller described above, which has strong resistance to voltage fluctuations and shocks, can quickly isolate the faulty end, and effectively solves the damage to the front-end main controller caused by voltage mutation due to damage to the back-end (i.e., the motor controller).

[0078] Since the processing and functions implemented by the motor controller of this embodiment basically correspond to the embodiments, principles and examples of the device, for the details not described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0079] According to an embodiment of the present invention, a motor corresponding to a protection device of a motor controller is also provided. The motor may include: the protection device of the motor controller described above, or the motor controller described above.

[0080] In the solution of the present invention, the motor has the protection device of the motor controller described above, and the protection device of the motor controller described above can be adopted as follows Figure 4 The protection circuit shown in Figure 1 is Figure 4The protection circuit shown includes: an RD protection unit, an inductor L1, a capacitor C1, a capacitor C2, and a voltage-stabilizing diode D2. The RD protection unit is composed of a diode D1 and a resistor R1 in parallel. In actual applications, the diode D1 or the resistor R1 is selected according to different customer needs, so that different customers can match and use it compatibly. Among them, the power supply VCC provided by the front-end main controller is connected to the ground GND after passing through the RD protection unit and the inductor L1, and the capacitor C1 and capacitor C2 are connected in parallel. The power supply VCC provided by the front-end main controller is also connected to the cathode of the voltage-stabilizing diode D2 after passing through the RD protection unit and the inductor L1, and the anode of the voltage-stabilizing diode D2 is grounded. The cathode of the voltage-stabilizing diode D2 is also connected to the output end of the power supply VCC1. The capacitor C1, the capacitor C2 and the voltage-stabilizing diode D2 are sequentially arranged between the inductor L1 and the output end of the power supply VCC1. The resistor R1 and the diode D1 are connected in parallel, and the power supply VCC provided by the front-end main controller is connected to the anode of the diode D1.

[0081] In such Figure 4 In the example shown, the RD protection unit is a resistor R1 and a diode D1 connected in parallel and one of the two is selected: if the resistor R1 is selected and the resistor R1 = 0 ohm, it plays a role of disconnecting under a large voltage impact to protect the safety of the back-end line; if the diode D1 is selected, it plays a role of preventing the back-end voltage and current from flowing back to achieve reverse isolation, so that the protection circuit can be used as a protection circuit compatible with reverse isolation. Among them, the selection of the diode D1 can be selected according to the reverse withstand voltage value of the diode D1. The diode D1 whose reverse withstand voltage value of the diode D1 must be selected is greater than the VDC input voltage to prevent the reverse voltage of the diode D1 from being too low and damaging the diode D1.

[0082] In such Figure 4 In the example shown, the first capacitor module is as follows Figure 4 The capacitor C1 shown in FIG. Figure 4 The capacitor C2, the capacitor C1 and the capacitor C2 are all filter capacitors, which can smooth voltage mutations and filter high-frequency noise, and can maintain a certain reaction time after power failure.

[0083] In such Figure 4 In the example shown, the inductor L1 can also be a magnetic bead. After the magnetic bead is connected in series in the circuit where the RD protection unit is located, it is connected to the capacitor C1, the capacitor C2 and the voltage-stabilizing diode D2 to suppress the sudden change of current and prevent the back-end output voltage from being too high, so that the protection circuit forms a circuit that resists power supply interference and voltage surge impact.

[0084] See also Figure 4In the example shown, when the VCC power supply provided by the front-end main controller is in normal input working state, the VCC power supply provided by the front-end main controller first passes through the diode D1, and the diode D1 is in the forward conduction state at this time; then it flows to the inductor L1 through the diode D1. The inductor L1 is equivalent to a resistor and an inductor in series here. The low frequency is inductive and the high frequency is resistive. The higher the frequency, the greater the impedance, thereby suppressing the high-frequency interference of the input power supply (that is, the VCC power supply provided by the front-end main controller). Capacitor C1 and capacitor C2 are both filter capacitors, which can smooth voltage mutations, filter out high-frequency noise, and maintain a certain reaction time after the power is cut off. The voltage regulator diode D2 is used to maintain the stability of the output voltage VCC1, stabilize the voltage at its rated voltage value, and prevent the output voltage VCC1 from overvoltage and damaging the back-end circuit. It can be seen that, Figure 4 The protection circuit shown, when the VCC power supply provided by the front-end main controller is in normal input working state, can effectively suppress the high-frequency interference and voltage mutation of the input power supply (i.e., the VCC power supply provided by the front-end main controller), and play a role in maintaining voltage stability, thereby providing reliable and high-quality power supply guarantee for the operation of the back-end circuit (such as a motor).

[0085] See also Figure 4 In the example shown, when voltage backflow occurs, that is, when the inverter module of the motor controller is damaged and the low-voltage VCC power supply and the high-voltage VDC power supply on the motor controller side are short-circuited, the high-voltage VDC on the motor controller side will enter the front-end main controller through the low-voltage VCC. At this time, when the backflow voltage flows to the diode D1, due to the characteristics of the diode D1 being forward-conducting and reverse-cutoff, the diode D1 can cut off the reverse current flow, completely blocking the current loop of the voltage backflow, as shown in FIG. Figure 3 As shown, the reverse isolation of the diode D1 protects the front-end main controller from being damaged by the high voltage impact caused by the voltage backflow.

[0086] In the scheme of the present invention, the motor has the protection circuit of the motor controller described above. The protection circuit has a strong ability to resist voltage fluctuations and impacts, can quickly isolate the faulty end, and effectively solves the damage to the front-end main controller caused by voltage mutation due to damage to the back-end (i.e., the motor controller).

[0087] Since the processing and functions implemented by the motor of this embodiment basically correspond to the embodiments, principles and examples of the device, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0088] According to an embodiment of the present invention, an air conditioner corresponding to a protection device of a motor controller is also provided. The air conditioner may include: the protection device of the motor controller described above, or the motor controller described above, or the motor described above.

[0089] In the solution of the present invention, the air conditioner has the above-mentioned protection device of the motor controller, and the above-mentioned protection device of the motor controller can be adopted as follows Figure 4 The protection circuit shown in Figure 1 is Figure 4 The protection circuit shown includes: an RD protection unit, an inductor L1, a capacitor C1, a capacitor C2, and a voltage-stabilizing diode D2. The RD protection unit is composed of a diode D1 and a resistor R1 in parallel. In actual applications, the diode D1 or the resistor R1 is selected according to different customer needs, so that different customers can match and use it compatibly. Among them, the power supply VCC provided by the front-end main controller is connected to the ground GND after passing through the RD protection unit and the inductor L1, and the capacitor C1 and capacitor C2 are connected in parallel. The power supply VCC provided by the front-end main controller is also connected to the cathode of the voltage-stabilizing diode D2 after passing through the RD protection unit and the inductor L1, and the anode of the voltage-stabilizing diode D2 is grounded. The cathode of the voltage-stabilizing diode D2 is also connected to the output end of the power supply VCC1. The capacitor C1, the capacitor C2 and the voltage-stabilizing diode D2 are sequentially arranged between the inductor L1 and the output end of the power supply VCC1. The resistor R1 and the diode D1 are connected in parallel, and the power supply VCC provided by the front-end main controller is connected to the anode of the diode D1.

[0090] In such Figure 4 In the example shown, the RD protection unit is a resistor R1 and a diode D1 connected in parallel and one of the two is selected: if the resistor R1 is selected and the resistor R1 = 0 ohm, it plays a role of disconnecting under a large voltage impact to protect the safety of the back-end line; if the diode D1 is selected, it plays a role of preventing the back-end voltage and current from flowing back to achieve reverse isolation, so that the protection circuit can be used as a protection circuit compatible with reverse isolation. Among them, the selection of the diode D1 can be selected according to the reverse withstand voltage value of the diode D1. The diode D1 whose reverse withstand voltage value of the diode D1 must be selected is greater than the VDC input voltage to prevent the reverse voltage of the diode D1 from being too low and damaging the diode D1.

[0091] In such Figure 4 In the example shown, the first capacitor module is as follows Figure 4 The capacitor C1 shown in FIG. Figure 4 The capacitor C2, the capacitor C1 and the capacitor C2 are all filter capacitors, which can smooth voltage mutations and filter high-frequency noise, and can maintain a certain reaction time after power failure.

[0092] In such Figure 4 In the example shown, the inductor L1 can also be a magnetic bead. After the magnetic bead is connected in series in the circuit where the RD protection unit is located, it is connected to the capacitor C1, the capacitor C2 and the voltage-stabilizing diode D2 to suppress the sudden change of current and prevent the back-end output voltage from being too high, so that the protection circuit forms a circuit that resists power supply interference and voltage surge impact.

[0093] See also Figure 4 In the example shown, when the VCC power supply provided by the front-end main controller is in normal input working state, the VCC power supply provided by the front-end main controller first passes through the diode D1, and the diode D1 is in the forward conduction state at this time; then it flows to the inductor L1 through the diode D1. The inductor L1 is equivalent to a resistor and an inductor in series here. The low frequency is inductive and the high frequency is resistive. The higher the frequency, the greater the impedance, thereby suppressing the high-frequency interference of the input power supply (that is, the VCC power supply provided by the front-end main controller). Capacitor C1 and capacitor C2 are both filter capacitors, which can smooth voltage mutations, filter out high-frequency noise, and maintain a certain reaction time after the power is cut off. The voltage regulator diode D2 is used to maintain the stability of the output voltage VCC1, stabilize the voltage at its rated voltage value, and prevent the output voltage VCC1 from overvoltage and damaging the back-end circuit. It can be seen that, Figure 4 The protection circuit shown, when the VCC power supply provided by the front-end main controller is in normal input working state, can effectively suppress the high-frequency interference and voltage mutation of the input power supply (i.e., the VCC power supply provided by the front-end main controller), and play a role in maintaining voltage stability, thereby providing reliable and high-quality power supply guarantee for the operation of the back-end circuit (such as a motor).

[0094] See also Figure 4 In the example shown, when voltage backflow occurs, that is, when the inverter module of the motor controller is damaged and the low-voltage VCC power supply and the high-voltage VDC power supply on the motor controller side are short-circuited, the high-voltage VDC on the motor controller side will enter the front-end main controller through the low-voltage VCC. At this time, when the backflow voltage flows to the diode D1, due to the characteristics of the diode D1 being forward-conducting and reverse-cutoff, the diode D1 can cut off the reverse current flow, completely blocking the current loop of the voltage backflow, as shown in FIG. Figure 3 As shown, the reverse isolation of the diode D1 protects the front-end main controller from being damaged by the high voltage impact caused by the voltage backflow.

[0095] In the scheme of the present invention, the air conditioner has the protection circuit of the motor controller described above, which has a strong ability to resist voltage fluctuations and impacts, can quickly isolate the faulty end, and effectively solves the damage to the front-end main controller caused by voltage mutation due to damage to the back-end (i.e., the motor controller).

[0096] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the device, for the details not described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0097] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0098] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A protection device for a motor controller, characterized in that: The motor controller is used to control the operation of the rear-end motor based on the power supply and control signal provided by the front-end main controller; the motor controller has a signal interface and a drive control circuit; The protection device of the motor controller comprises: an RD protection unit; wherein, The RD protection unit is arranged between the signal interface and the drive control circuit, and is used to connect the connection path between the signal interface and the drive control circuit when the motor controller is fault-free, and transmit the power supply and control signal provided by the front-end main controller to the drive control circuit to protect the motor controller itself; and In the event that the motor controller fails, the connection path between the signal interface and the drive control circuit is disconnected or blocked to prevent voltage or current backflow from the motor controller to the front-end main controller, thereby protecting the front-end main controller.

2. The protection device for the motor controller according to claim 1, characterized in that: The RD protection unit comprises: a resistor module and a diode module connected in parallel; wherein: The signal interface is connected to the anode of the diode module, and the cathode of the diode module can be connected to the drive control circuit; when in use, the resistor module or the diode module can be selected for use; and the reverse withstand voltage value of the diode module is greater than the value of the VDC input voltage in the power supply and control signal provided by the front-end main controller; Wherein, in the case where the resistance module is selected, the resistance module is used to connect the resistance module itself when the motor controller is not faulty, so as to connect the connection path between the signal interface and the drive control circuit; and, in the case where the motor controller is faulty, disconnect the resistance module itself, so as to disconnect the connection path between the signal interface and the drive control circuit; When the diode module is selected, the diode module is used to make the diode module forward-conducting when the motor controller is faulty so as to connect the connection path between the signal interface and the drive control circuit; and to make the diode module reverse-cutoff when the motor controller is faulty so as to block the connection path between the signal interface and the drive control circuit.

3. The protection device for the motor controller according to claim 1 or 2, characterized in that: Also includes: Interference suppression unit; wherein, The interference suppression unit is arranged between the RD protection unit and the drive control circuit, and is used to suppress interference signals within a set frequency range of the power supply and control signal provided by the front-end main controller, so as to further implement protection processing of the power supply and control signal provided by the front-end main controller.

4. The protection device for the motor controller according to claim 3, characterized in that: The interference suppression unit includes: an inductor module or a magnetic bead module.

5. The protection device for a motor controller according to any one of claims 1 to 4, characterized in that: Also includes: Filter unit; wherein, The filtering unit is arranged between the RD protection unit and the drive control circuit, and is used to filter the power supply and control signal provided by the front-end main controller, so as to further protect the power supply and control signal provided by the front-end main controller; Wherein, when the protection device of the motor controller further includes an interference suppression unit, the filtering unit is located between the interference suppression unit and the drive control circuit, and is connected between the common end of the interference suppression unit and the drive control circuit and the ground.

6. The protection device for the motor controller according to claim 5, characterized in that: The filtering unit comprises: a first capacitor module and a second capacitor module; wherein the first capacitor module and the second capacitor module are arranged in parallel.

7. The protection device for a motor controller according to any one of claims 1 to 6, characterized in that: Also includes: A voltage stabilizing diode module; wherein the RD protection unit can be connected to the cathode of the voltage stabilizing diode module; the anode of the voltage stabilizing diode module is grounded; In the case where the protection device of the motor controller also includes an interference suppression unit and a filtering unit, the RD protection unit is connected to the drive control circuit after passing through the interference suppression unit; the filtering unit and the Zener diode module are located between the interference suppression unit and the drive control circuit; the common end of the interference suppression unit and the drive control circuit is grounded after passing through the filtering unit and the Zener diode module respectively; and the common end of the interference suppression unit and the drive control circuit is connected to the cathode of the Zener diode module.

8. A motor controller, characterized in that: include: A protection device for a motor controller as claimed in any one of claims 1 to 7.

9. A motor, characterized in that: include: A protection device for a motor controller as claimed in any one of claims 1 to 7, or a motor controller as claimed in claim 8.

10. An air conditioner, characterized in that: include: A protection device for a motor controller as claimed in any one of claims 1 to 7, or a motor controller as claimed in claim 8, or a motor as claimed in claim 9.

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